JP2500252Y2 - Roll chock attachment / detachment device for rolling mill - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chock attaching / detaching device for quickly and surely attaching / detaching a roll chock during roll changing work of a rolling mill.

[0002]

2. Description of the Related Art Conventionally, when a roll of a rolling mill is worn or the size of steel material to be rolled is changed, roll chock (hereinafter,
(Also called "chock") is rearranged. As the frequency of roll replacement increases, the work time for changing the chocks affects production efficiency, so this work time needs to be as short as possible. Therefore, many chocks attaching / detaching devices by mechanical means have been proposed in order to save the line stop time and save labor (Japanese Patent Laid-Open No. 63-22).
0913, JP-A-64-53709, and JP-B-59-
13285, Japanese Examined Patent Publication No. 52-47414, Actual Public Examination 59
-27926 gazette).

Generally, in various rolling mills such as strip mills, the rolling roll is rotatably supported by a roll chock in which the neck portion of the roll shaft has a rolling bearing and the like, and the roll chock holding the rolling roll is a rolling mill. It is supported by a stand. A clearance is provided between the roll shaft and the inner ring of the bearing in consideration of the ease of attaching and detaching the chock.

When a roll chock of this kind is to be replaced during roll replacement, in the past, the adjust ring of the roll removed from the rolling mill was loosened manually to release the pressure contact of the thrust ring divided into two, and the bolt of the thrust ring was removed. After pulling out and removing the thrust ring from the roll neck, the roll 51 is placed on the roll stand 52 as shown in FIG.
The traveling carriage 55 provided with the chock cradle 54 is moved to the lower portion. Then, the elevating table 56 provided with the chock receiving table 54 is raised to receive the weight of the chock 53 at the chock receiving table 54, and the traveling vehicle 55 is moved in the axial direction to roll the roll shaft 51 of the old roll 51.
Work is in progress to remove the chock 53 from a. The detached chock 53 is re-fitted into the new roll for replacement by the chock cradle 54, is attached to the new roll in the reverse order of the above work, and the reassembling work is completed. Incidentally, 53a is a bearing provided in the chock 53.

[0005]

By the way, as described above, the rolls of the rolling mill are frequently replaced, for example, when the rolls are worn, the type of steel material is changed, or the size of rolled steel material is changed. , In that case, since the roll chock itself is shared, it is necessary to frequently attach and detach the chock. For example, if it is a rolling mill with 10 stands, it will be necessary to carry out replacement work at each stand in sequence, and usually 100 to 150 times of replacement work is required per month, so roll chock attachment / detachment work should be carried out daily. Becomes

In the conventional roll chock attachment / detachment work, as described above, the chock 53 is supported by the chock cradle 54 and pulled out from the roll shaft 51a. Since there is only about 0.1 mm to 0.2 mm, the roll shaft 5 while supporting the chock load by the chock cradle 54.
1a and the chock 53 are aligned, and the roll shaft 51
Since it is moved in the axial direction while keeping the clearance between a and the inner ring of the bearing 53a uniform over the entire circumference, at this time, if the elevator 56 is raised too much, the lower surface of the inner ring of the bearing 53a is not enough and the upper surface of the bearing 53a is Is pressed against the roll shaft 51a. Since the roll chock 53 has a large weight, when the roll chock 53 is pressed in this way, a large resistance is exerted when the chock is attached / detached, and the bearing 53a may be damaged. If the roll axis does not match the center of movement of the attachment / detachment device,
Since the clearance is small as described above, the roll shaft 51a and the bearing 53a come into contact with each other and cannot be pulled out. In that case, the work is performed while moving the chock cradle 54 up and down and left and right. This will impair the certainty, speed and smoothness of the work, and will also hinder the entire roll reassembling work, requiring a lot of time and labor for roll replacement, which is a major obstacle to improving production efficiency. Becomes

In this way, the conventional work for attaching and detaching the chock is
This is a work that requires the experience and skill of the worker, and the work efficiency depends largely on the experience or skill of the skilled worker, and the work requires time.

Although a method of maintaining the clearance by monitoring the load with a load cell or the like or controlling the position of the roll and the chock cradle is also used, all of them require high precision and require a great manufacturing cost. It becomes a device that does and is not practical.

On the other hand, even in the mechanical chock attachment / detachment device described in the above publications, when the chock load is supported on the chock cradle, it is not possible to check what the load balance is, etc. Alternatively, the inner surface of the roll chock may be damaged due to one-sided contact or the like when it is mounted. Therefore, even in these conventional examples, there are still problems in the reliability, quickness, and smoothness of the work for attaching and detaching the chock.

Therefore, an object of the present invention is to make the contact resistance between the roll shaft and the bearing extremely small and to automatically attach and detach the chock by balancing the chock cradle with a counterweight and supporting it in a floating manner. At the same time, it is an object of the present invention to provide a chock attachment / detachment device for a rolling mill, in which the roll chock can be attached / detached more smoothly and labor saving can be achieved.

[0011]

In order to achieve the above object, a roll chock attachment / detachment device for a rolling mill according to the present invention is provided with a chock cradle that is movable in the axial direction of the roll chock, and a fulcrum for holding the choc cradle. On the other hand, a counter mechanism is arranged so as to face the above-mentioned chock cradle so that the chock cradle is supported in a floating manner to form a floating mechanism.

[0012]

With the above construction, when the rolls of the rolling mill are exchanged, the chock cradle is moved to the lower part of the roll chock from the axial direction of the roll and set, and then the weight of the chock is supported by the chock cradle. At this time, since the counterweight is arranged so as to face the fulcrum holding the chock cradle, the chock cradle constitutes a floating mechanism that is supported in a floating manner, and the chock cradle side and the counterweight side are It will be in a balanced state. This eliminates the need for accurate roll shaft alignment when attaching and detaching the chock, and even if the bearing in the chock contacts the roll shaft, the chock cradle swings and moves in the contact direction. The resistance is extremely small and the work of attaching and detaching the chock can be performed extremely smoothly.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view of the entire chock attaching / detaching device according to the first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG.

As shown in the figure, a chock cradle 2 for receiving the load of the roll chock 1 is provided on the upper portion of the traveling carriage 3 and traveling wheels 3a driven by a traveling motor (not shown) are provided under the traveling carriage 3. It is provided and can move in the axial direction of the roll shaft.

A holding plate 4 is erected on a base 3b of the traveling carriage 3, and a swing rod 5 is supported on the upper portion of the holding plate 4 by a holding shaft 6, and the holding shaft 6 is swing rod. It becomes a fulcrum P which is the center of swing of No. 5. A support roller 7 for supporting the chock cradle 2 is held by a shaft 8 at one end of the swing rod 5, and a swing cylinder for forcibly swinging the swing rod 5 at the other end. Nine rods 9a are pivotally attached.
A body portion 9b of the swing cylinder 9 is pivotally attached to the traveling carriage 3 side. Further, the swing rod 5 is provided with a guide groove 10 between the fulcrum P and the pivotally mounted portion of the swing cylinder 9, and the guide roller 11a provided on the counterweight 11 is provided in the guide groove 10. Has been inserted. The counterweight 11 is provided with a cylinder 12 in which a body portion 12b is pivotally attached to the swing rod 5 side and a rod 12a is pivotally attached to the counterweight 11 side. By expanding and contracting the cylinder 12, Guide roller 11a
Slides in the guide groove 10 to change the position of the counterweight 11.

On the other hand, a chock cradle 2 is provided on the support roller 7 side, and this chock cradle 2 is composed of a cradle 2a, an intermediate pedestal 2b, and a lift 2c in this embodiment. The supporting roller 7 is provided on the lower surface of the lifting table 2c.
Contact each other, and the support roller 7 supports the chock cradle 2. A ladder bearing 13 or the like is interposed between the lifting platform 2c and the intermediate platform 2b so that the intermediate platform 2b can move left and right in the front view shown in FIG.
In addition, a chock receiving base 2 is provided above the intermediate base 2b via a load sensor 14 in this embodiment. Since the ladder bearing 13 as described above is provided between the intermediate table 2b and the lifting table 2c, a spring (not shown) or the like is used so that the chock receiving table 2 always returns to the neutral position. A neutral holding mechanism is provided.
Further, lifting guides 15 are provided downward on both edges of the lifting platform 2c, and a plurality of cylindrical guide rollers 16 are provided from the traveling carriage 3 side so that the lifting guides 15 vertically move up and down. It is provided so as to guide the elevating guide 15.

In the first embodiment, since the chock cradle 2 and the counter weight 11 are arranged so as to face the holding shaft 6 which is the fulcrum P of the swing rod 5, the weights of the two are reduced. A mechanism for supporting in a floating manner by balancing (hereinafter referred to as a floating mechanism) is configured.

Further, this chock attachment / detachment device is mounted on a traveling table 18 traveling in a direction perpendicular to the axis of the roll 17, as shown in the front view of the detached state of FIG. 4 and the plan view of FIG. In this state, the chock attaching / detaching device can run on the rail 20 in a direction perpendicular to the chock attaching / detaching device by the drive motor 19 in a state where the chock is removed.

The chock attachment / detachment work according to the first embodiment of the present invention thus constructed will be described below. In advance, FIG.
As shown in the schematic diagram showing the concept of the floating mechanism, the distance h from the fulcrum to the weight W of the counterweight 11 is balanced with the weight V determined by the type of the chock 1 and the moment of the distance H from the fulcrum P. The control unit (not shown) drives the cylinder 12 (see FIG. 1) to move the counterweight 11 so that

From this state, the rocking cylinder 9 shown in FIG. 1 is extended to forcibly lower the chock receiving base 2 side of the rocking rod 5, and the traveling carriage 3 is moved in the axial direction to move the chock 1 of the chock 1. Move the chock cradle downwards. And
By contracting the swing cylinder 9, the chock receiving base 2 is brought into contact with the lower surface of the chock 1. Then, the swing cylinder 9
By releasing the pressure of 1, the weight of the chock 1 is received by the chock cradle 2 and balanced with the counterweight 11.

When the traveling carriage 3 is moved in the axial direction in this state, the chock 1 is pulled out while maintaining the clearance between the roll shaft 17a and the bearing 1a in the chock 1. At this time, even if the bearing 1a (see FIG. 6) comes into contact with the roll shaft 17a due to misalignment of the roll shaft 17a, the chock cradle 2 is swingably supported,
The chock cradle 2, that is, the bearing 1a moves in the direction in which the clearance is always maintained. As a result, the contact resistance between the roll shaft 17a and the bearing 1a can be set to an extremely small value without requiring control for maintaining the clearance, and the chock 1 can be smoothly extracted. In addition,
The oscillating cylinder 9 can function as an oil damper when the oscillating rod 5 oscillates by closing the piping system with the hydraulic pressure free and providing a throttle valve and the like.

Then, as shown in FIG. 4, the roll shaft 17
The chock attachment / detachment device, in which the chock 1 is removed from a, is moved in the axial direction on the traveling platform 18,
Is moved along the rail 20 by the drive motor 19 to the position of the new roll which is prepared in a vertical position (not shown) in FIG. Then, the chocks are attached to the new rolls in the reverse order of the above chocks removal work.

The height of the shaft center of the roll 17 placed on the roll stand 21 and the height from the lower surface of the chock 1 to the center are known in advance, and when the chock cradle 2 and the counterweight 11 are balanced. Since the height to the upper surface of the chock cradle 2 can also be calculated in advance, if the height of the chock cradle 2 is set to the above size, the floating mechanism also moves the chock cradle 2 even if it fluctuates slightly from that position. Therefore, accurate centering can be eliminated.

Further, even if the chock weight changes due to a change in roll type or the like, the position of the counterweight 11 with respect to a plurality of chock weights is previously determined from the relationship between the weight and the distance from the fulcrum P shown in the schematic view of FIG. And calculate
The data can be stored in a control device (not shown), and the position of the counterweight 11 corresponding to the chock to be exchanged can be arbitrarily selected and dealt with.

Further, in the first embodiment, the roll shaft 17
Even if a is eccentric in the horizontal direction, it can be moved in the horizontal direction by the ladder bearing 13 provided between the elevating table 2c and the intermediate table 2b. are doing.
The floating mechanism may be configured only in the vertical direction without providing the ladder bearing 13. Also, the first
In the embodiment, since the load sensor 14 is provided between the receiving table 2a and the intermediate table 2b, the chock load can be detected by the load sensor 14 and fed back to the subtle position adjustment of the counterweight 11. , Need not be provided in particular. Further, the vertically movable chock cradle 2 is composed of a cradle 2a, an intermediate pedestal 2b, and a lift 2c.
When the load sensor 14 or the rudder bearing 13 is not provided, each of the above components may be integrally formed.

Next, a second embodiment will be described based on the front view of the entire chock attaching / detaching device shown in FIG. The same components as those in the above-described first embodiment will be described with the same reference numerals. As shown in the figure, in the second embodiment, the center of a constant pulley 22 fixed to the traveling carriage 3 is used as a fulcrum P to support the chock cradle 2 and the counterweight 11 in a floating manner. It is fixed to a bracket 2d attached to the chock cradle 2, and the other end is fixed to the counterweight 11 via a pulley 22. An elevating cylinder 24 is provided below the counterweight 11. An elevating guide 15 is provided in the lower part of the chock cradle 2, and a guide roller 16 that serves as a guide for ascending and descending is provided on the side of the elevating guide 15 on the traveling carriage 3 side.

In this second embodiment, the pulley 2 serving as the fulcrum P
The chock cradle 2 and the counterweight 11 are arranged so as to face each other, and the floating mechanism is configured to be supported in a floating manner by balancing the mutual weights.

In the chock attachment / detachment work according to the second embodiment of the present invention constructed as described above, first, the lifting cylinder 24 is extended to raise the counterweight 11, thereby lowering the chock cradle 2 side. The traveling carriage 3 is moved in the axial direction to move the chock receiving base 2 below the chock 1. Then, the lifting cylinder 24 is adjusted so that the weight of the counterweight 11 with respect to the distance from the fulcrum P is balanced so as to balance the chock weight and the moment of the distance from the fulcrum P, which are determined by the type of the chock 1.
Adjust the internal pressure of. As a result, the lower surface of the chock 1 comes into contact with the upper surface of the chock pedestal 2, and the weight of the chock 1 is received by the chock pedestal 2 to be in balance with the counterweight 11.

In this state, if the traveling carriage 3 is moved in the axial direction, the chock 1 can be pulled out while maintaining the clearance between the roll shaft 17a and the bearing 1a. At this time, the relationship between the roll shaft 17a and the bearing 1a is the same as that in the first embodiment described above, and therefore will be omitted. And
As in the above-described first embodiment, the chock 1 is moved to the position of the new roll, and the chock is attached to the new roll by a method reverse to the above-mentioned choke extracting work.

In the second embodiment, the pulley 22 and the wire 23 are used to connect the chock cradle 2 and the counterweight 11, but a sprocket and a chain may be used without any particular limitation.

As described above, according to the present invention, when the chock is attached or detached, the chock is supported by the chock weight and the axial contact resistance between the roll shaft and the inner ring of the bearing is kept extremely small. Since the chock is attached and detached by moving in the direction, even if the level accuracy of the roll shaft core and the top surface of the chock cradle is poor, or if the relative position changes due to misalignment, the chock weight Since the balance between the counter weight and the counter weight is maintained, it moves by the force when it comes into contact with the bearing, so that the chock can be attached / detached smoothly without damaging the bearing.

[0032]

EFFECT OF THE INVENTION According to the present invention, the floating mechanism is constructed by floatingly supporting the vertically movable chock cradle by the counterweight that balances with the weight of the chock, so that the roll shaft and the bearing contact each other. Since the chock cradle moves in the direction that maintains the clearance, the contact resistance between the inner ring of the bearing and the roll shaft is extremely small, and the work can be smoothly performed without damaging the bearing when the chock is attached or detached.

Further, since the chock cradle is supported in a floating manner to maintain balance, it is not necessary to perform accurate centering when attaching and detaching the chock, and the level accuracy of the roll shaft core and the top surface of the chock cradle is poor. In this case, or even when the relative position changes during the attaching / detaching process, the chock can be attached / detached smoothly and with labor saving.

Further, even if the chock weight changes depending on the type of roll, it is possible to deal with it by changing the position of the counterweight and adjusting the moment, so that the roll chock can be always smoothly attached and detached. Become.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of the entire chock attaching / detaching device of the present invention.

FIG. 2 is a sectional view taken along line AA of the first embodiment shown in FIG.

FIG. 3 is a sectional view of the first embodiment shown in FIG. 1 as seen from the front.

FIG. 4 is a front view showing a detached state of the chock attaching / detaching device of the present invention.

FIG. 5 is a plan view of FIG.

FIG. 6 is a schematic view showing the concept of the floating mechanism of the present invention.

FIG. 7 is a front view showing a second embodiment of the entire chock attaching / detaching device of the present invention.

FIG. 8 is a side view showing a conventional chock attachment / detachment device.

[Explanation of Codes] 1 ... Roll chock 1a ... Bearing 2 ... Chock cradle 3 ... Traveling vehicle 4 ... Holding plate 5 ... Swing rod 6 ... Holding shaft 7 ... Support roller 9 ... Swing cylinder 10 ... Guide groove 11 ... Counterweight 12 ... Cylinder 15 ... Elevating guide 16 ... Guide roller 17 ... Roll 17a ... Roll shaft 18 ... Traveling platform P ... Support point V, W ... Load H, h ... Distance

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-220913 (JP, A) JP-A-64-53709 (JP, A) JP-B-59-13285 (JP, B2) JP-B-52- 47414 (JP, B2) JP 59-27926 (JP, B2)

Claims (1)

(57) [Scope of utility model registration request] 1. A chock cradle by providing a chock cradle that is movable in the axial direction of the roll chock, and disposing a counterweight so as to face the chock cradle with respect to a fulcrum that holds the chock cradle. A roll chock attachment / detachment device for a rolling mill, characterized in that a floating mechanism is configured by supporting it in a floating manner.