JP4250848B2 - Top roll replacement device for squeeze stand - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a top roll replacement device for a squeeze stand of an electric resistance steel pipe production line.
[0002]
[Prior art]
In the ERW steel pipe production line, a belt-like skelp is bent into a cylindrical shape and welded while squeezing the seam portion with a squeeze roll, and an ERW steel pipe having a true circular cross section is formed and manufactured with a sizing roll. 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 to change the size of the forming roll is frequently performed. The squeeze roll has a bottom roll, a side roll, and a top roll. When changing the roll, the top roll assembly with the top roll attached is lifted and the top roll is changed offline. Perform replacement. Since the offline roll change of this top roll assembly takes time compared to other roll changes of the line, in order to shorten the roll change time of the entire line, the roll change of this top roll assembly is efficiently performed. There is a need.
[0003]
Conventionally, when changing the top roll of this squeeze roll stand, four wire ropes are attached to the top of the top roll assembly so that the fitting portion where the top roll assembly is fitted to the four stand posts is not twisted. Lift evenly, transport to an off-line 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. It was disassembled and the roll was changed.
[0004]
The most time-consuming process during the above-mentioned replacement of the top roll is the process of lifting the assembly evenly with four hanging wires, the process of returning, and the roll of the top roll assembly by 90 degrees using an auxiliary hoist. It was a process of placing correctly on top.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to rationalize the above-described process of changing the top roll of the squeeze roll stand, to advance the work quickly and accurately, and to shorten the time.
[0006]
[Means for Solving the Problems]
The present invention is characterized by taking the following technical means to achieve the above object. That is, a horizontal pin-coupled suspension frame attached to the top of a top roll assembly of a squeeze stand of an electric resistance welded pipe production line, a slope that receives the suspended assembly and tilts a suspended body below the horizontal pin, and the assembly Provided at the lower end of the slant, and is engaged with the top end of the slanted surface and the bottom surface of the slanting body is placed on the slanted surface. A squeeze stand top roll exchanging device comprising: a stopper as a turning center to be turned over; and a holding table for turning the assembly around a position supported by the stopper and holding the assembly sideways.
[0007]
In the present invention, a suspension frame that suspends the center of gravity of the top roll stand is attached to the upper end of the top roll stand by a horizontal pin. This eliminates the need for adjustment to achieve smooth suspension and suspension by uniform sliding with the four posts while balancing with the conventional four wire ropes. Further, the use of an auxiliary hoist when the top roll stand rolls over eliminates the need for a skillful process of rolling the roll 90 ° to a predetermined position.
[0008]
In the present invention, a dedicated slope, a stopper, and a holding stand are provided as a jig for smoothly and safely and easily rolling over the top roll assembly in a short time. This eliminates the use of the auxiliary hoist along with the pin-coupled suspension frame, and ensures a quick and accurate roll-over process of the top roll assembly.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a top roll assembly 10 of a squeeze roll stand, and shows a state in which the top roll assembly 10 of a squeeze roll stand is suspended on a tipping device 40, and FIG. 2 is a front view thereof (AA in FIG. 1). (Arrow view). The top roll assembly 10 houses a top roll holding portion 20 (20a, 20b) in a housing 11.
[0010]
The top roll holding part 20 (20a, 20b) holds the top roll 21 (21a, 21b), and the top roll holding part 20a in the left half of FIG. 2 has the top roll 21a for the maximum steel pipe diameter. The holding | maintenance part currently hold | maintained is shown, and the right half toward FIG. 2 shows the top roll holding | maintenance part 20b holding the top roll 21b for minimum steel pipe diameters. The top roll holding portion 20a or 20b is moved up and down by a reduction screw 22 of a reduction device 23 driven by an electric motor 24, and presses and welds both sides of a seam welded portion of an electric resistance welded steel pipe (not shown). The top roll holding part 20 (20a, 20b) is attached to the holding frame 13, and is exchanged with the holding frame 13.
[0011]
The top roll assembly 10 is lifted by the hanging frame 30, and FIGS. 1 and 2 show a state in which the top roll assembly 10 has just been conveyed onto the overturning device 40. In this example, the hanging frame 30 is a gate-shaped hanging frame having two legs 31 and is connected to a bracket 25 attached to the housing 11 by a horizontal pin 32.
[0012]
One of the bottom portions 12 of the top roll assembly 10 is placed on the top of the slope of the overturning device 40. A locking piece 14 is attached to the bottom 12, and the locking piece 14 is locked to the top of the slope of the overturning device 40. Further, as shown in FIG. 2, a side stopper 41 is attached to the outer top of one end of the overturning device 40. As shown in FIG. 2, one end of the bottom 12 of the top roll assembly 10 is brought into contact with the side stopper 41 to position the top roll assembly 10 on the left and right.
[0013]
The overturning device 40 has a slope, and when the crane hook 35 is lowered in the state of FIG. 1, the top roll assembly 10 tilts and the bottom surface is placed on the slope of the overturning device 40 as shown in FIG. 3. Tilt to the right state. The length of the inclined surface of the overturning device 40 is substantially equal to the length of the bottom surface of the top roll assembly 10, and the inclination is preferably about 30 to 45 degrees. This inclination is stable in a state in which the top roll assembly 10 is stably tilted about the locking piece 14, the bottom surface of the top roll assembly 10 is deposited on the slope, and then tilted about the lower end stopper. It is determined from the viewpoint that can be transferred to. The most preferable inclination is 40 to 43 degrees. A lower end stopper 42 also serving as a mounting table is provided at the lower end of the slope, and the top roll assembly 10 placed on the slope of the overturning device 40 has an end face of the auxiliary plate 15 attached to the bottom surface of the other end of the bottom portion 12. It contacts the side surface of the lower end stopper 42.
[0014]
When the crane hook 35 is further lowered, the contact portion between the auxiliary plate 15 and the side surface of the lower end stopper 42 becomes the fall center, and the top roll assembly 10 further tilts and finally rolls over as shown in FIG. 4 shows a side view of the overturning device 40, and the plan view thereof is shown in FIG. The overturning device 40 includes a lower end stopper / mounting table 42 and a mounting table 44 on a base plate 43, and supports a side surface of the top roll assembly 10 in a state where it rolls over. The suspension device mounting table 45 supports the suspension device 30. In this state, the top roll assembly 10 is opened and the top roll is replaced.
[0015]
When the roll replacement is completed, the crane hook 35 is lifted, and the top roll assembly 10 is returned to the ERW steel pipe production line in the reverse procedure. As described above, when the apparatus of the present invention is used, the top roll assembly is lifted with four hanging wires, and instead of the labor-consuming work of overturning 90 degrees using an auxiliary hoist, the lifting and hanging are performed quickly and accurately. Thus, the roll change of the top roll assembly of the squeeze roll can be performed in a short time.
[0016]
【The invention's effect】
According to the present invention, the top roll change of the squeeze roll, which is the most time-consuming and troublesome in the roll change operation of the ERW steel pipe production line, can be performed quickly and accurately. It has an excellent effect that it greatly contributes to the operation.
[Brief description of the drawings]
FIG. 1 is a view showing a state in which a top roll assembly is suspended on a tipping device.
FIG. 2 is a view taken in the direction of arrows AA in FIG.
FIG. 3 is an explanatory diagram of a process of overturning a top roll assembly.
FIG. 4 is an explanatory diagram showing a state in which the vehicle is overturned.
FIG. 5 is a plan view of the overturning device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Top roll assembly 11 Housing 12 Bottom part 13 Holding frame 14 Locking piece 15 Auxiliary plate 20 Top roll holding part 21 (21a, 21b) Top roll 22 Reduction screw 23 Reduction device 24 Electric motor 25 Bracket 30 Suspension device 31 Leg 32 Horizontal pin 33 Hook pin 35 Crane hook 40 Falling device 41 Side stopper 42 Lower end stopper / mounting table 43 Base plate 44 Mounting table 45 Suspension device mounting table

Claims (1)

A horizontal pin-coupled suspension frame attached to the top of the top roll assembly of the squeeze stand of the ERW steel pipe production line, a slope that receives the suspended assembly and tilts the suspension below the horizontal pin, and a lower end of the assembly And a locking piece that locks to the upper end of the slope and puts the bottom surface of the suspension body on the slope, and holds the lower end of the suspension body on the lower end of the slope to further fall the suspension body A top roll replacement device for a squeeze stand, comprising: a stopper serving as a turning center; and a holding table that rotates the assembly around a position supported by the stopper and holds the assembly sideways.

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