JPS5913521A - Roll replacing method of steel pipe straightening machine - Google Patents

Abstract

PURPOSE:To execute simply and easily a roll replacing work of a steel pipe straightening machine, and to raise the productivity, by coupling chocks of the upper and lower rolls as one body by use of a coupling device, and drawing them out to the outside. CONSTITUTION:Chocks 6, 4 to which upper and lower rolls 5, 3 are installed, respectively are turned up to a position intersecting at right angles with a pass line P-P of a steel pipe, etc. Subsequently, the roll 5 is lowered, is coupled as one body with the roll 3 by a coupling device 9, and a connecting part 82 is coupled with an engaging part 43 of the chock 4. Subsequently, the chocks 6, 4 are slid along a slide beam 71, and are moved to a prescribed position. Subsequently, new rolls 5, 3 coupled as one body with said upper and lower chocks 6, 4 are carried onto the beam 71, and the projecting part of the chock 4 is fitted into a groove 73 of the beam 71.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for changing the rolls of a straightening machine for straightening bends that occur during the processing of copper tubes and round bars (hereinafter simply referred to as copper tubes).

As is well known, the rolls of steel pipe straightening machines constantly come into contact with high-temperature steel pipes, and in the case of low-temperature steel pipes, the P-sil reaction force is large, so the surface is easily damaged, so they must be replaced with new ones from time to time. There must be. Also, if the dimensions of the steel pipe to be straightened differ within a predetermined range, they can be straightened with the same roll, but
If this range is exceeded, it is necessary to replace the roll with one that matches the dimensions of the steel pipe.

By the way, the rolls of a steel pipe rolling mill are installed at a predetermined interval above and below the pass line of the steel pipe to be straightened, and intersect with the pass line at a predetermined angle (usually 30°±5°). , rearrangement work is extremely troublesome. Conventionally, the work of changing the rolls of a straightening machine, taking out the rolls from the main body, transporting them, and installing them was carried out one by one using an overhead crane, and due to the structure of the main body, it was not possible to lift the rolls directly above the machine. Therefore, a balance weight was attached to the roll, and the roll was first pulled out laterally, and then lifted.

For this reason, recombination π requires a large number of workers and takes a long time, resulting in a lot of lost time, which is a major obstacle to improving productivity. Additionally, since the overhead crane was monopolized during the reorganization work, there were many problems such as interfering with other work.

The present invention was made to solve the above-mentioned conventional problems, and its purpose is to reduce the number of workers by simplifying and facilitating the work of changing the rolls of a steel pipe straightening machine. At the same time, it is possible to shorten working time, improve productivity, and further reduce the usage time of the overhead crane.

In order to achieve the above-mentioned object, the method for changing the rolls of a steel pipe straightening machine according to the present invention is a straightening machine for straightening bends that occur during the processing of steel pipes, etc., in which chocks to which upper and lower rolls are respectively attached are used. Combined into one piece, it can be carried out from the main body orthogonally to the straightening pass line of steel pipes, etc.! It is characterized by being carried into the main body. The present invention will be explained below using the drawings.

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is an A-A plan view thereof. In both figures, 1 is the base of the straightening machine body, 2
is a machine which is rotatably mounted on the base 1, for example, by a rank 21 and a gear 22K. 1st bottom of the grated rice - ra,
As shown in FIG. 6, it is attached to a chock 4 via a bearing, which is provided on one machine 2 and has a protrusion 41 that is slidably fitted into one groove 2. In addition, as shown in FIG.
After that, at least two arms 24, 24a pivotally mounted on both sides of one machine are engaged with the engaging portion 41 of the chock 4, and the bolts 42, 42a k pivotally mounted on the chock 4Vr are connected and the nuts are tightened. The lower roll 6 is fixed with
As shown in the figure, the machine base 2 should be fully rotated [, J: With respect to the pass line P - P K of the steel pipe, its axis X - Xt
-θl (for example, 30') tilt the main body K! Jl is included.

Reference numeral 5 denotes an upper roll, to which a chock 5Vr is attached via a bearing, and the chock 5 is attached to a machine base 2aiC in the same way as the chock 4 of the lower roll O. Further, this machine base 2a is attached to a screw jack or the like (not shown) attached to the main body so that it can move up and down by π and can rotate. As shown in FIG. 2, the upper roll 5 is assembled into the main body with its axis Y-Y inclined by 02 (for example, 60) with respect to the pass line P-PK of the steel pipe.

F is a stand for drawing out the roll 6.5, and a groove 72 that is aligned with the groove 26 of the machine base 2 is provided on the top surface of the sliding beam knife located close to the machine base 2. 8 is a hydraulic cylinder fixed to a frame 73 provided behind the sliding beam 71;
9.9a+! This is a connecting device that connects the upper and lower chocks 4 and 6 together.

+Next vr, the structure and operation π of the engaging part 4 provided on the chock 4 of the lower roll 5 and the connecting part 82 provided at the tip of the operating ring 81 of the hydraulic cylinder 8, as shown in Figs. 6 and 4. An explanation will be given based on an example. The engaging portion 4 Vr of the chock 4 is provided with a cylindrical hole 44 having a π opening 45 at one end. On the other hand, the connecting portion 82 provided in the operating ring 81K of the hydraulic cylinder 8 is provided with a groove having a width that matches the thickness W of the tip engaging portion 4, and this groove 83 has a rectangular shape in the center. A shaft having a fitting portion 85 is rotatably mounted. The length of the short side of this fitting section is slightly shorter than the width of the opening 450 of the hole 44 of the engagement part 43, and the length of the long side is the length of the engagement part 46.
The diameter of the hole 44 is equal to y, and both ends are formed into an arc shape that matches the inner wall of the hole 44. 86&″f, attached to the shaft 84).

The connection action between the engaging portion 46 and the connecting portion 82 constructed as described above will be explained as follows. First, the handle &S is rotated in the axial direction of the oil cylinder 8 to make the long side of the fitting part 5 parallel to the axis of the hydraulic cylinder 8.Next, when the operating ring 81 of the hydraulic cylinder 8 is advanced, the fitting is made. The engaging portion is inserted into the hole 44 through the opening 45 of the engaging portion 43, and is positioned at the dashed line 85aK in FIG. 4. In this state, the handle 86'f
r: 90 When rotated, the fitting portion 85 is in the state shown by the broken line 85b in FIG. 4, and the two are completely connected.

The structure and operation of the coupling device 9.9a for integrally coupling the chocks 4 and 6 of the upper and lower rolls 6.5 with π are as follows. As shown in the embodiment of FIGS. 5 and 6, first the upper chock 6 is lowered, and when it reaches a predetermined gap with the lower chock 4, the coupling devices 9, 9a are inserted between both chocks 4.6. Installing. This device has a pair of key-shaped arms 92 on each side of the main body 91.
a, 92b, 92c, and 92d are pivotally connected to the pin 9, and a movable member 94 is interposed between the pair of upper and lower arms 92b and 92a (the mechanism on the right side of the figure will be mainly explained below). pin 95 provided on the movable member 94
grooves 96a, 96 provided at the ends of the key-shaped arms 92a, 92b.
b K-fitted. This movable member 94 has a threaded rod 9
7 are screwed together, and a female threaded rod 98 whose one end is connected to the other movable member is screwed into the threaded rod 97.

Now, when the threaded rod 97 is rotated by the handle 99, the movable member 94 screwed onto the threaded rod 97 is displaced to the left in the figure, and the key-shaped arms 92a and 92b connected to it by the pin 95 are moved by the pin? Rotate outward around point 3. On the other hand, the key-shaped arm 92c
, 92d are displaced to the right in the figure by a female threaded rod 98, and key-shaped arms 92c, 92d are connected thereto.
Rotate outward. In this state, if the coupling devices 9 and 9a are inserted between the chocks 4 and 6, and the handle 99 is rotated in the opposite direction, each arm 92a to 92d will rotate inward by π around the pin 96, and the key portions will each rotate. It engages with the engaging portions 44, 44a and 64.64a of the chocks 4, 6, and both chocks 4
Join ゜6 together.

An example of the operation for rearranging the rolls according to the present invention configured as described above will be explained as follows.

(1) The drive shaft is supported by a spindle support provided on the drive side of the roll 6.5, and when the roll reference angle (for example, 0') is reached, the coupling is removed.

121 g 2 As shown in the figure, the chocks 4.6 of the roll 6.5 are each rotated to the position where the roll 5 is perpendicular to the pass line PP.

(3) The upper roll 5 is lowered and is integrally joined to the lower roll 3 by the joining devices 9, 9a (hereinafter, the roll may be referred to as a chock).

(4) The operating ring 81 of the hydraulic cylinder 8 is advanced, and the connecting portion 82 is connected to the engaging portion 43Vc of the lower chock 4.

(5) Chock arms 24 and 24a of machine bases 2 and 2a 4 and 6
Remove from.

(6) Retract the operating ring 81 of the hydraulic cylinder 8, and
The connected chocks 4 and 6 are slid on the sliding beam 71π to a predetermined position (see FIG. 1).

(7) Disconnect the operating ring 81 of the hydraulic cylinder 8 and the lower chock 4.

(8) Overhead crane VCX, P move the upper and lower chocks 6.4 together to a predetermined location (for example, a roll shop).

(9) The upper and lower chocks are joined together by an overhead crane and the new roll is carried to the top of the sliding beam 71, and the protrusion of the lower chock is fitted into the groove η of the sliding beam 71. installs a new roll into the body f in the reverse order as described above.

In the above explanation, we have described the case where the upper and lower rolls 5.6 that have been moved to a predetermined position (Fig. 1) or the new upper and lower rolls are transported by an overhead crane. The sliding beam 71 at the part where the rolls 3 and 4 are placed is configured to be fully rotatable, and a beam having grooves 4 perpendicular to the sliding beam 71 is provided, and the single force of this beam is New upper and lower rolls are prepared on the side, and the roll 6.5 pulled out from the main body is transported from the beam on the other side to, for example, a roll shop, and the new roll that has been waiting is transferred to the sliding beam 71.
After moving to , the hydraulic cylinder 8 may be used to send it into the main body.

Further, the structure of the engagement portion 43 of the lower chock 4 and the connecting portion 82 of the operating ring 81 of the hydraulic cylinder 8, and the structure of the coupling device 9.9a of the upper and lower chocks 6.4 are not limited to the embodiments. However, various mechanisms can be implemented.

In the case where the top and bottom are integrally connected and a single chock is carried out or carried in outside the main body by a hydraulic cylinder, as shown in 2, a screw jack, chain mechanism, etc. may also be used. Furthermore, the configurations of π and other parts are not limited to the embodiments, and may be changed as appropriate without departing from the gist of the present invention.

It is clear from the above explanation that the present invention connects the chocks of the upper and lower rolls together using a coupling device and pulls them out to the outside using a hydraulic cylinder, making the roll rearrangement process easier and shorter. can be done. In addition to reducing the total number of workers involved in this one-time operation, it is possible to significantly reduce loss time due to work stoppages, thereby improving production efficiency, and furthermore, the operating time of the overhead crane can be significantly shortened. Conventional 2
- In the 2-2-2 type straightening machine, it took a whole day (including adjustment work) to replace the rolls, but according to the present invention, the roll replacement can be completed in 3 to 4 hours. The effect is strong and thick.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is an enlarged plan view taken along line A-A thereof, Fig. 6 is a plan view showing an embodiment of a coupling mechanism between a chock and an operating ring of a hydraulic cylinder, and Fig. 4. 5 is a side view of the main part of the embodiment showing how the upper and lower chocks are attached and connected, and FIG. 6 is a front view, partially shown in section. 1: Base, 2, 2a: Machine base, 6.5 colors, 4, 6:
Chock, 7; frame, 8: hydraulic cylinder, 9.9a: coupling device. Agent: Patent Attorney Sanro KimuraFigure 5Figure 6

Claims (1)

[Claims] In a straightening machine for straightening the curves (curves caused during processing of steel pipes, etc.), chocks with upper and lower rolls attached to them are connected together, and the straightening machine straightens the straightening path line of the steel pipe, etc. at right angles to the straightening pass line. A method for changing the rolls of a steel pipe straightening machine, characterized by carrying the rolls out of the machine or into the main body.