JPS6364249B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for changing the rolls of a pipe mill, particularly a seamless tube mill, a mandrel mill, and a sizing mill installed in a pipe manufacturing line.

For example, a sizing mill is installed at the end of a pipe manufacturing line and is used to adjust the pipe to a specified outer diameter and at the same time improve the quality of the product (bending, surface condition, etc.). It is necessary to frequently replace the rolls due to changes, scratches on the rolls, wear of the rolls, etc.

In a conventional sizing mill, as shown in Fig. 12, mill housing assemblies a and a' are mounted on fixed bases b and b' that are inclined at an angle of about 45 degrees and whose inclination directions are alternately opposite. The roll shaft ends e, e' are connected to drive devices d, d' via couplings c, c'. however,
Since the mill housing assemblies a and a' are fixed to the fixed bases b and b' of each stand by bolts, the bolts must be removed and lifted by a crane or the like when replacing the mill housing assemblies a and a'. Also, when assembling, it is suspended from a crane etc. to the fixed base b,
After finely adjusting the relationship with each stand, the housing assembly a, a' and the fixed base b,
b' must be installed, productivity deteriorates due to long mill downtime due to frequent roll changes, and sling work is required to use a crane etc. during work, resulting in safety issues. There were problems such as lack of quality and the need for a large number of workers.

Therefore, in order to solve the above problem, the mill housing is placed on a cart that can be moved in the direction of the rolling line, and when replacing the housing, the cart is moved in the direction of the rolling line and then moved in a direction perpendicular to the rolling line. A method has been developed in which each roll of the mill housing is replaced by placing it on another trolley where possible and pulling the other trolley out of the line. There are problems such as the need to attach and detach pipes such as hydraulic jacks, which increases replacement time, and requires a large number of spares of expensive mill housings, which increases equipment costs and operation and maintenance costs. Ta.

The present invention was made for the purpose of eliminating the above-mentioned drawbacks of the conventional means, and the roll axis is inclined when viewed from the line direction, and the roll axes before and after the line direction are opposite to each other and intersect. In a pipe manufacturing line in which a plurality of mill housings are arranged, a side shift cart is installed on both sides of the pipe mill in the line direction and is movable parallel to the pipe manufacturing line, and a side shift cart is installed at right angles to the pipe manufacturing line on the side shift cart. a towing truck capable of moving in a direction; and a towing truck connected to the towing truck by a removable coupling fitting to be pulled and movable in a direction perpendicular to the pipe production line, and capable of being incorporated into the mill housing, and the side shifter. A roll changing cart loaded with a pair of rolls that can be pulled out onto the cart, and a roll changing cart traveling guide member inclined downwardly within the mill housing in a direction perpendicular to the pipe production line, and rolls can be exchanged by running the towing cart. It is characterized in that the truck is horizontal on the side shift truck and tilted inside the mill housing.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in Fig. 2, a plurality of fixed bases 1 are provided at predetermined positions on the pipe line, each inclined at an angle of about 45 degrees toward the center and with the inclination direction alternately facing the opposite direction. A mill housing 2 having a hollow part inclined at an angle of about 45 degrees toward the center of the pipe production line is disposed, and a mill housing 2 having a hollow part inclined at an angle of about 45 degrees toward the center side of the pipe production line is disposed inside the lower member of the mill housing 2. A rail 3 inclined at an angle of about 45 degrees toward the center of the pipe production line when viewed from the front is laid, and a roll exchange cart 4 runs on the rail 3 via wheels 5.
is configured to be positioned within the mill housing 2 via a rail 3.

As shown in FIGS. 2 and 3, the roll exchange cart 4 has a substantially U-shape consisting of a horizontal member and a vertical member when viewed from the direction of the pipe production line, and a roll axle box 6 is placed on the horizontal member. As shown in FIGS. 6 and 7, the side of the vertical member through which the roll shaft box 6 passes is hollow so as not to interfere with the roll shaft 7. In addition, when the roll exchange cart 4 comes to a predetermined position on the rail 3, the lower surface of the horizontal member of the roll exchange cart 4 is provided with a structure shown in FIG. As shown in FIG. 7, drilling holes 9 are provided.

Nuts 10 whose axes extend vertically are screwed onto the upper and lower sides of the mill housing 2, and the reduction screw 8 is screwed onto the nuts 10, and a worm wheel is inserted into the worm wheel shaft boxes 11 disposed on the upper and lower surfaces of the mill housing 2. The wheel 12 is rotatably supported and the reduction screw 8 is attached to the worm wheel 12.
The worm wheel 12 is fitted into the hollow part via a spline key 13, and a worm 37 driven by an electric motor 14 shown in FIG. 2 is meshed with the worm wheel 12.

Figures 6, 8, 9 A and 9, and 10 A,
B, C. As shown in FIG. 11, the gate-shaped clamp guide 15 having the guide hole 38
The clamp body 16 is fitted into the guide hole 38 so as to be able to slide in the direction of the pipe manufacturing line, and a portion protruding toward the center of the mill housing 2 is provided at approximately the center of the clamp body 16 in the longitudinal direction.
A fluid pressure cylinder 17 for moving the clamp body 16 in the direction of the pipe production line is provided on the protrusion, and a pin is attached to the tip of the piston rod 18 fitted to the fluid pressure cylinder 17 to the mill housing 2 and the clamp guide 15. By moving the clamp body 16 toward the center of the mill housing 2, the protruding portion 6a of the roll axle box 6 is fixed through the groove 39 of the clamp body 16, and the roll 21 does not move in the axial direction. do it like this.

As shown in FIG.
Accordingly, a side shift cart 23 that can move in the direction of the pipe manufacturing line on a guide 40 shown in FIG. A towing trolley is provided with twice as many sets of rails 24 as the number of mill bases, each rail 24 is provided with a rack 25 extending along the rail 24, and a drive device 27 is provided on each rail 24. A pinion 28 provided at the lower part of the tow truck 26 and rotatable by a drive device 27 is engaged with the rack 25, and by rotating the pinion 28, the tow truck 26 is moved to the rail 24. be able to travel along the

A fixed frame 41 is disposed on the outside of the side shift cart 23 with the center of the pipe production line as a reference, and the traction cart 26 that has traveled on the rail 24 transfers from the rail 24 to the fixed frame 41. A rail 24' which is parallel to the rail 24 is fixed to the rail 24 so as to obtain a fixed frame 41, and as shown in FIG. Secure the rack 25'.

A connecting fitting 29 is pivotally attached to the front surface (pipe manufacturing line side) of the towing cart 26, and the connecting fitting 29 is swung up and down by a fluid pressure cylinder 30 disposed on the towing cart 26, thereby changing the roll exchange cart. Connecting metal fitting 29 to the connecting pin 31 attached to the rear end of 4.
It is configured so that it can be attached and detached.

In the figure, 32 is the roll drive electric motor, 33 is the reducer, and 34 is the output shaft of the reducer 33 and the spindle 3.
A coupling ring 36 for connecting the spindle 35 and the roll shaft 7 is a coupling ring 36 for connecting the spindle 35 and the roll shaft 7. Although not shown, when the roll exchange cart 4 is on the rail 3 of the mill housing 2, A stopper is installed to prevent it from moving below a predetermined position.

During normal pipe manufacturing with a pipe mill, the second
As shown in the figures, the roll exchange cart 4 on which the rolls 21 used for rolling are placed is located at the required position on the rail 3 of the mill housing 2, and the traction cart 26 is on the pipe manufacturing line side on the rail 24 of the side shift cart 23. The connecting fitting 29 is engaged with the connecting pin 31 by the fluid pressure cylinder 30 .

Further, for every other set of roll exchange carriages 4 in use, another roll exchange carriage 4 is placed on standby on the carriage 23 and rail 24 with spare rolls placed thereon.

For example, when replacing all the rolls of the roll exchange cart 4 that are tilted in the same direction among the rolls 21 used for pipe manufacturing at once, the roll shaft 7 of a predetermined roll 21 and the spindle 35 are connected. moving the coupling ring 36 in the axial direction,
Release the connection between the roll shaft 7 and the spindle 36,
The upper screw 8 of the mill housing 2 is raised and the lower screw 8 is lowered to separate it from the roll shaft box 6 as shown in FIG.
7 to move the clamp body 16 in the direction away from the roll center, release the engagement between the clamp body 16 and the protrusion 6a of the roll axle box 6, and move each roll exchange cart 4 tilted in the same direction. , the drive device 2 of the tow truck 26 connected to the truck 4
7 to rotate the pinion 28, the carriage 23 is removed from the rail 3 of the mill housing 2.
Pull it up onto the rail 24.

When the roll exchange truck 4 is pulled up to a predetermined position on the rail 24 of the side shift truck 23, the traction truck 26 runs on the rail 24 toward the fixed frame 41, and the pinion 28 moves onto the side shift truck 23.
The fixed frame 41 is removed from the rack 25 of the
The rack 25' is engaged with the tow truck 26.
travels on the rail 24' on the fixed frame 41 and stops at a predetermined position on the fixed frame 41.

The old roll exchange trolley 4 is now the side shift trolley 23
While being pulled up to a predetermined position above, the towing trolley 2
6 reaches a predetermined position on the fixed frame 41, the connection between the old roll exchange cart 4 and the traction cart 26 is released by removing the connecting fitting 29 from the connecting pin 31 by the hydraulic cylinder 30, and the hydraulic cylinder 22 The side shift cart 23 is moved toward the pipe production line, and the side shift cart 4 on which a new roll exchange cart 4 with spare rolls to be inserted is placed is placed in place of the old roll exchange cart 4 that was pulled up. The rail 24 of 23 is matched with the rail 3 of the mill housing 2 and the rail 24' of the fixed rail 41.

When the predetermined rails 3, 24, 24' are aligned and connected, the hydraulic cylinder 30 engages the connecting fittings 29 with the connecting pins 31, thereby connecting the tow truck 26 and the new roll exchange truck 4.
The driving device 27 of the tow truck 26 transfers the new roll exchange truck 4 from the rail 24 of the side shift truck 23 to the rail 3 of the mill housing 2, and the roll exchange truck 4 transfers from the rail 3 of the mill housing 2 to the rail 3 of the mill housing 2. When the desired position is reached, the clamp body 16 is moved toward the center of the roll and engaged with the protrusion 6a of the roll axle box 6 to prevent the roll axle box 6 from coming off the mill housing 2, and the reduction screw 8 is moved up and down or The spindle 35 is lowered to bring its lower end or upper end into contact with the roll shaft box 6, and the spindle 35 is raised to insert its upper end into the coupling ring 36 to connect the roll shaft 7 and the spindle 35. The new roll exchange cart 4 is now installed at a predetermined position within the mill housing 2, and the exchange of the rolls 21 is completed.

When inserting the roll change truck 4 into the mill housing 2, the traction truck 26 moves from the rail 24' of the fixed frame 41 to the rail 24 of the side shift truck 23.
It moves upwards and stops at the position shown by the solid line in Figure 3.

In addition, in the embodiment of the present invention, a case has been described in which all the rolls 21 of the roll exchange cart 4 tilted in the same direction are replaced at the same time, but it is also possible to replace one set of rolls, and the towing cart is It goes without saying that the work may be carried out using cylinders or chains, and that various other changes may be made without departing from the gist of the present invention.

Since the pipe mill roll changing device of the present invention has the above-described configuration, it can achieve various excellent effects as described below.

Whether all rolls are reassembled or any roll is replaced, rapid roll replacement is possible. Therefore, line stoppage time is shortened and productivity is improved.

Since piping connection work is not required, unattended automatic replacement is possible.

Equipment costs are reduced because there are fewer standby stands than before.

Because there is no need for slinging work when replacing,
Improves work safety.

[Brief explanation of drawings]

Fig. 1 is a plan view of a roll changing device for a pipe mill according to the present invention, Fig. 2 is a view taken in the - direction arrow of Fig. 1;
FIG. 3 shows a towing trolley during roll exchange according to the present invention;
An explanatory diagram of the position of the roll exchange cart, etc., Figure 4 is the 3rd
- direction arrow view of figure, figure 5 is figure 3 -
6 is a view in the -direction direction of FIG. 2, FIG. 7 is an explanatory view of the reduction screw shown in FIG. 6 separated from the roll shaft box, and FIG. 8 is a view in the direction of FIG. - Direction arrow view, Figure 9 A and B are explanatory views of the clamp guide, Figure 9 A is a front view, Figure 9 B is a left side view of Figure 9 A, and Figure 10 A, B, and H are illustrations of the clamp guide. is an explanatory diagram of the clamp body; Figure 10A is a front view;
Figure B is the left side view of Figure 10 A, and Figure 10 C is the left side view of Figure 10 A.
Figure 0 A is a view in the direction of the arrow A, Figure 11 is the 6th arrow view.
The XI-XI direction arrow view in the figure and FIG. 12 are explanatory diagrams of a conventional roll changing device of a pipe mill. In the figure, 2 is a mill housing, 3 is a rail, 4 is a roll exchange cart, 6 is a roll shaft box, 7 is a roll shaft,
8 is a reduction screw, 11 is a worm wheel axle box, 12 is a worm wheel, 15 is a clamp guide, 16 is a clamp body, 17 is a fluid pressure cylinder, 18 is a piston rod, 21 is a roll, 22
is a fluid pressure cylinder, 23 is a side shift truck, 2
6 is a towing truck, 29 is a connecting fitting, 30 is a hydraulic cylinder, 32 is a roll drive electric motor, 34 is a coupling, 35 is a spindle, 36 is a coupling, and 41 is a fixed frame.

Claims (1)

[Claims] 1. Installed on both sides of the pipe mill in the line direction in a pipe manufacturing line in which multiple mill housings are arranged so that the roll axis is inclined when viewed from the line direction, and the roll axes at the front and back of the line direction are opposite to each other and intersect with each other. a side shift cart that can move parallel to the pipe production line; a traction cart that can move on the side shift cart in a direction perpendicular to the pipe production line; a roll change truck carrying a pair of rolls, which can be moved in a direction perpendicular to the pipe production line by being towed by the mill housing, which can be incorporated into the mill housing and which can be pulled out onto the side shift truck, and the pipe production line. A roll exchange trolley traveling guide member is provided within the mill housing at right angles to the mill housing, and the roll exchange trolley is configured to be horizontal on the side shift trolley and inclined within the mill housing as the towing trolley runs. A pipe mill roll changing device featuring: