JPH0222084Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention relates to a hydraulic reduction device in a rolling mill.
In particular, the present invention relates to a hydraulic lowering device in which a lowering cylinder can run on a carrier beam.

[Prior art and its problems]

In a rolling mill that is equipped with a hydraulic rolling device at the bottom of the rolling screw to adjust the interval between the upper and lower work rolls and control the thickness of the product, the back-up roll is shifted upward when replacing the work rolls. , it is necessary to remove the hydraulic pressure reduction cylinder to secure space for moving the backup roll upward.

For this reason, the present applicant first developed a hydraulic rolling down device that allows the rolling down cylinder to run on a carrier beam and be temporarily removed when such rolls are replaced (see Utility Model Application No. 129943/1989). 1978
-38308)). This device is equipped with a wheel that can be raised and lowered on a hydraulic pressure reduction cylinder, and the wheel can be lowered or raised by a hydraulic cylinder for raising and lowering, and the vehicle runs on a carrier beam with the wheel lowered. be.

However, in the above-described method, the wheels are moved up and down using hydraulic cylinders, so when the wheels are raised and kept on standby during the rolling operation, oil pressure must always be introduced into the hydraulic cylinders. It is necessary to operate the hydraulic unit for a long time,
Moreover, there was a problem that there were many chances for problems such as oil leakage.

[Purpose of invention]

Although the present invention uses hydraulic cylinders to move the wheels, it is an object of the present invention to provide a hydraulic lowering device that can shorten the operating time of the hydraulic unit and reduce the chances of troubles such as oil leakage.

[Structure of the idea]

In order to achieve the above object, the present invention uses a spring as a means for raising the wheel, and the spring urges the wheel upward so that the wheel is always held in a standby position except when in use.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, 1 is a housing, 2 is an upper back up roll, and 3 is a back up roll that supports the back up roll 2. Chiyotsuku, 4
is a support member of the backup roll yoke 3;
Reference numeral 5 designates a carrier beam for lifting the backup roll yoke 3 via the support member 4 to suppress rattling of the bearing, and reference numeral 6 designates a lowering screw attached to the upper part of the housing 1. and,
A reduction cylinder 7 is provided between the reduction screw 6 and the backup roll chock 3.
This reduction cylinder 7 has a piston 8 fixed to a pressure holder 9, 9' held at the tip of the reduction screw 6 by a retaining member 10, and a cylinder 11 that can move up and down. Wheels 13 running on the carrier beam 5 are attached to both sides via a lifting cylinder mechanism 12.

Details of this part will be described with reference to FIG. A cylinder cover 14 is attached to the cylinder 11, and a cylinder mechanism insertion hole 15 is formed between the cylinder cover 14 and the side wall of the cylinder 11, and the cylinder mechanism 12 is inserted into this hole 15. This cylinder mechanism 12 includes a cylinder 16,
It is equipped with a piston 17, a piston rod 18, and a spring 19, with the piston rod 8 facing upward and its tip fixed to the cylinder cover 14, and the cylinder 16 is slidably inserted into the hole 15. It is set. 20
2 is a sliding portion between the cylinder 17 and the inner surface of the hole 15;
1 indicates a sliding portion between the inner surface of the cylinder 16 and the piston 17.

Inside the cylinder 16 of the cylinder mechanism 12,
A spring 19 is interposed between the top surface of the piston 17 and a spring receiving member 22 fixed to the top of the cylinder 16.
9, the cylinder 16 is always urged upward. By supplying pressure oil from a pressure oil introduction path 23 formed in the piston rod 18 to a cylinder chamber 24 constituted by the lower end of the piston 17 and the inner wall surface of the cylinder 16, the cylinder 16 resists the force of the spring 19. It is now possible to lower the

A freely rotatable wheel 13 is provided at the lower part of the cylinder 16 of the cylinder mechanism 12 equipped in this manner, and the wheel 13 rests on the carrier beam 5 when the cylinder 16 is lowered. Note that 25 is a key for preventing rotation.

Next, the operation of the hydraulic pressure lowering device 26 having the above configuration will be explained.

During normal rolling operations, when pressing down the backup roll 2 with the hydraulic lowering device 26, the cylinder mechanism 12 is first brought into a state in which no pressure oil is supplied. Then, the cylinder 16 urged upward by the spring 19 is raised to the upper limit position (the position shown in FIG. 2), and the wheel 13 is held at a standby position above the carrier beam 5. When pressure oil is supplied to the cylinder chamber of the reduction cylinder 7 in this state, the gap between the piston 8 and the cylinder 11 opens and the piston 8 is in contact with the reduction screw 6, so the cylinder 11 descends, thereby increasing the back-up roll. Backup roll 2 is pushed down via pusher 3.

On the other hand, when removing the hydraulic pressure lowering device 26 at the time of roll replacement, the lowering screw 6 is slightly raised to create a gap between the lowering screw 6 and the pressure receivers 9, 9', and then the lifting cylinder mechanism 12 is removed. Pressure oil is supplied to the cylinder chamber 24. Then, the wheel 13 is lowered together with the cylinder 16, and the wheel 13 is placed on the carrier beam 5, and the reduction cylinder 7 is slightly lifted supported by the wheel 13, and a gap is created between the lower surface of the cylinder 11 and the back-up roll yoke 3. A gap is provided so that the hydraulic lowering device 26 can run on the carrier beam 5. In this state, by moving the hydraulic lowering device 26 in the axial direction of the back-up roll 2 and moving it out of the housing 1, a gap is created between the back-up roll yoke 3 and the lowering screw 6. Furthermore, it becomes possible to shift the backup roll 2 upward, and the work roll can be set at a predetermined exchange position. Furthermore, when reassembling the hydraulic pressure lowering device 26, the above-described procedure may be reversed.

In this way, the hydraulic rolling down device with the above configuration lowers the wheels by supplying pressure oil to the hydraulic cylinder, but raises the wheels by the force of the spring, so no hydraulic pressure is required during normal rolling operations. In addition to reducing the operating time of the hydraulic unit, there is also less chance of troubles such as oil leakage.

[Other Examples]

Next, another embodiment of the present invention will be described with reference to FIG.

As in the previous embodiment, a cylinder cover 14 is attached to the cylinder 11 of the reduction cylinder 7, and an elevating cylinder mechanism insertion hole 15 is formed between the cylinder cover 14 and the side wall of the cylinder 11, and the cylinder mechanism is inserted into this hole 15. 30 is inserted and installed.
This cylinder mechanism 30 is of a two-stage telescopic type, and has another slidable intermediate cylinder 33 between an outer cylinder 31 and a piston 32.
That is, an intermediate cylinder 33 is slidably provided inside the outer cylinder 31 so as to function as a piston, and a piston 32 having a piston rod 34 is slidably provided inside the intermediate cylinder 33. The cylinder mechanism 30 is set with the piston rod 34 facing upward, the tip of which is fixed to the cylinder cover 14, and the outer cylinder 31 is slidably inserted into the cylinder mechanism insertion hole 15. There is. 3
5 is a sliding part between the outer cylinder 31 and the inner surface of the hole 15; 36 is a sliding part between the inner peripheral surface of the outer cylinder 31 and the outer peripheral surface of the intermediate cylinder 33; 37 is the sliding part between the inner peripheral surface of the intermediate cylinder 33 and the piston 32. The sliding part is shown.

A stepped portion 31a is formed on the inner circumferential surface of the outer cylinder 31 of the cylinder mechanism 30, and a flange portion 33a is formed on the outer circumferential surface of the intermediate cylinder 33 corresponding to the stepped portion 31a.
A spring 39 is interposed between the upper surface of the flange portion 33a and a spring receiving member 38 fixed to the upper part of the outer cylinder 31, and the outer cylinder 31 is urged upward with respect to the intermediate cylinder 33. ing. The spring receiving member 38 is fitted onto the inner periphery of the upper end of the outer cylinder 31 and fixed by an annular screw member 40, and its lower end is connected to the upper end of the stopper 41 inserted into the upper part of the flange portion 33a inside the outer cylinder 31. By this contact, the amount of movement of the outer cylinder 31 relative to the intermediate cylinder 33 is restricted. The amount of movement in this case is l ₁ .

Similarly, a spring 44 is interposed inside the intermediate cylinder 33 and is located between the upper surface of the piston 32 and a spring receiving member 43 fixed to the upper end of the intermediate cylinder 33 by an annular screw member 42. Cylinder 33 is urged upward relative to piston 32. Further, in this case, a stepped portion 34a is formed on the circumferential surface of the piston rod 34, and the stepped portion 34a hits the lower end of the spring receiving member 43, so that the amount of movement of the intermediate cylinder 33 is regulated to l _2. .

In the former mechanism, pressure oil is supplied from a pressure oil introduction path 45 formed in the outer cylinder 31 to a cylinder chamber 46 formed between the inner wall of the cylinder 31 and the front end surface of the intermediate cylinder 33. , the dimension l ₁ of the outer cylinder 31 relative to the intermediate cylinder 33 against the force of the spring 39
It is designed so that it can be lowered only by
In addition, in the latter mechanism, the piston rod 3
Piston 3 from the pressure oil introduction passage 47 formed in 4.
By supplying pressure oil to the cylinder chamber 48 formed by the tip of the cylinder 2 and the inner wall surface of the intermediate cylinder 33, the intermediate cylinder 33 can be lowered relative to the piston 32 against the force of the spring 44. There is.

Moreover, the cylinder mechanism 30 equipped in this way
A freely rotatable wheel 1 is installed at the bottom of the outer cylinder 31 of the
3 is provided in the same manner as in the previous embodiment, and the wheels 13 rest on the carrier beam 5 when the outer cylinder 31 or the intermediate cylinder 33 is lowered. In addition, 49 is a key for preventing rotation.

Next, the operation of the hydraulic pressure lowering device 50 having the above configuration will be explained.

During normal rolling operations, no pressure oil is supplied to either the cylinder chambers 46 or 48, as in the previous embodiment. Then springs 39 and 44
Due to the action of the outer cylinder 31 and the intermediate cylinder 3
3 also rises, and the wheels 13 are held in a standby position above and away from the carrier beam 5 (the position shown in FIG. 3). In this state, press down cylinder 7 as described above.
Press down on the backup roll 2.

On the other hand, when replacing the roll, proceed as follows. As for roll replacement, there are cases in which a work roll is replaced and a back-up roll is replaced, and the height at which the reduction cylinder 7 is lifted differs in each case. Therefore, the operation of the cylinder mechanism 30 is made to correspond to each case. That is, as described above, the cylinder mechanism 3
0 has two operating mechanisms. One is a mechanism for lowering the outer cylinder 31, and the other is a mechanism for lowering the intermediate cylinder 33. Therefore, the amount of movement l ₁ and l ₂ of each cylinder 31, 33 is
The height at which the reduction cylinder 7 should be lifted in each case is set in advance. For example, when replacing the work roll, pressure oil is supplied from the pressure oil supply path 45 to the cylinder chamber 46 to lower the outer cylinder 31. Then, the wheels 13 on the lower surface of the cylinder 31 are placed on the carrier beam 5, and supported by the wheels 13, the lowering cylinder 7 is slightly lifted, so that the hydraulic lowering device 50 itself can run on the carrier beam 5. In this case, since the amount of movement of the outer cylinder 31 is set to a value necessary for exchanging the work rolls, the hydraulic pressure lowering device 50 can be moved in this state to exchange the rolls without any inconvenience.

When replacing the backup roll 2, the outer cylinder 31 is lowered, and the inner intermediate cylinder 33 is also lowered in the same manner as described above.

In this way, in this embodiment as well, the wheels are lowered by supplying pressure oil to the hydraulic cylinder, but the wheels are raised by the force of the spring, so that the same effects as in the previous embodiment can be obtained.

In the above two embodiments, springs are incorporated inside the cylinder mechanisms 12 and 30, but the structure is such that the wheels or the lifted and lowered parts connected to the wheels are biased upward by the springs. If so, the invention is not limited to the above embodiment.

[Effect of idea]

Although the hydraulic rolling device of the present invention uses hydraulic cylinders to lower the wheels to run on the carrier beam, it uses springs as a means to raise the wheels and hold them in the standby position. Hydraulic pressure is required only when the wheels are lowered, such as when changing rolls, which reduces the operating time of the hydraulic unit and reduces the chances of problems such as oil leaks. It has the same effect as if it were possible to do so.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an overall outline of an embodiment of the present invention, FIG. 2 is a detailed sectional view of the main parts of the same embodiment,
FIG. 3 is a detailed sectional view of the main parts of another embodiment of the present invention. 2...Backup roll, 3...Backup roll, 5...Carrier beam, 6...
...Reduction screw, 7...Reduction cylinder, 12...
... Cylinder mechanism for lifting, 13... Wheels, 16...
Cylinder, 17...Piston, 18...Piston rod, 19...Spring, 26...Hydraulic lowering device, 30...Elevating cylinder mechanism, 31...Outer cylinder, 32...Piston, 33...Intermediate cylinder, 34...Piston rod, 39...Spring, 44...Spring.

Claims (1)

[Scope of utility model registration request] In a hydraulic lowering device, a lowering cylinder provided between a lowering screw and an upper back up roll chock is provided with wheels that can be raised and lowered, and the wheels run on a carrier beam while being lowered by a hydraulic cylinder. A hydraulic lowering device comprising: a spring for urging the wheel upward to move it to a standby position.