JPH0549104U - Roll chock attachment / detachment device for rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a chock attachment / detachment device for a rolling mill that quantifies empirical factors to enable automatic chok attachment / detachment while achieving labor saving. [Structure] A chock cradle 1 is provided on a traveling carriage 3 that is movable in the axial direction of a roll chock 21, and the chock cradle 1 is configured to be vertically movable and capable of posture control by a pair of left and right lifting cylinders 4 provided in the roll chock axial direction. To do. A plurality of load sensors 9 for detecting the load of the roll chock 21 are arranged on the chock cradle 1, and the load value of each load sensor 9 is set by the controller based on the signals from the plurality of load sensors 9. Thus, the posture of the chock cradle 1 is controlled by appropriately operating the lifting cylinder 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chock attachment / detachment device for quickly and reliably attaching / detaching a roll chock during roll changing work of a rolling mill.

[0002]

[Prior Art]

 When the rolls of the rolling mill are worn or the size of the steel material to be rolled is changed and rolls are replaced, roll chock (hereinafter simply referred to as “chock”) is exchanged between the replacement rolls. As the frequency of roll replacement increases, the work time for changing chocks affects production efficiency, so this work time must be kept as short as possible. Therefore, in order to save the line stop time and to save labor, many chock attaching / detaching devices by mechanical means have been proposed (Japanese Patent Laid-Open Nos. 63-220913, 64-53709, and 59-59). 13285, JP-B-52-47414, JP-B-59-27926, etc.).

Generally, in various rolling mills such as strip mills, the rolling rolls are rotatably supported by a roll chock having a rolling bearing and the like, and the roll chock holding the rolling roll is supported by a rolling mill stand. Has been done. A clearance is provided between the roll shaft and the bearing inner ring in consideration of the ease of attaching and detaching the chock.

In the case of replacing this kind of roll chock at the time of roll replacement, conventionally, the adjust ring is loosened manually and the thrust ring divided into two is released from the pressure, and the thrust ring bolt is removed to remove the thrust ring from the roll neck. After that, the old roll is being removed while the roll chock is suspended by a crane. The removed roll chock is refitted into the new roll for replacement using a crane, and the new roll is attached in the reverse order of the above work, and the reassembling work is completed.

[0005]

[Problems to be solved by the device]

 The rolls of the rolling mill are frequently replaced when the rolls are worn or the size of the steel material to be rolled changes, but in this case, the roll chock itself is shared and the chucks are frequently attached and detached. As described above, the conventional roll chock attachment / detachment work is inefficient in that it is performed almost manually except for using a crane.The roll chock has a large weight, and it takes a lot of time and labor to replace the rolls. Is necessary, which is a major obstacle to improving production efficiency. Also, this work requires the experience and skill of the workers. In other words, when loading and unloading the chock of the rolling mill roll, the crane or chock cradle is used to support the chock load while observing the clearance between the roll shaft side and the chock boss side. It depends largely on the experience of the staff.

On the other hand, in the mechanical chock attachment / detachment device described in each of the above publications, when the chock load is supported on the chock cradle, it is not possible to check what the load balance is, and the chock is removed from the roll. There is a risk that the inner surface of the roll chock will be damaged due to uneven contact when the roll is pulled out or attached. Therefore, even in these conventional examples, there are still problems in the reliability, speediness, and smoothness of the chock attachment / detachment work.

An object of the present invention is to provide a plurality of load sensors on a chock cradle to quantify the empirical factors described above to enable automatic chock attachment / detachment, and at the same time, enable smoother attachment / detachment of the roll chock. The object of the present invention is to provide a chock attachment / detachment device for a rolling mill that can achieve labor saving and labor saving.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the roll chock attachment / detachment device of the rolling mill of the present invention is provided with a chock cradle that is movable in the axial direction of the roll chuck, and the chock cradle is configured to be vertically movable and its posture can be controlled by an elevating means. At the same time, a plurality of load sensors for detecting the load of the roll chock are arranged on the chock cradle, and the posture of the chock cradle is controlled via the elevating means based on signals from the plurality of load sensors. It is characterized by the provision of a controller.

[0009]

[Action]

 In the above configuration, when the rolls of the rolling mill are replaced, the chock cradle is set at the lower part of the roll chock by moving it from the roll axial direction, and then the elevating means is operated to raise the chock cradle to support the load of the chock. To do. At this time, the load of the chock is detected by the multiple load sensors provided on the chock cradle and is sent to the controller to confirm that the full load of the chock is being received by the controller and the load values of the multiple load sensors. Therefore, it is possible to monitor the load balance and control the attitude of the chock cradle by operating the lifting means so that these conditions are optimal. This prevents one-sided contact when pulling out or installing the chock, which makes the chock attachment / detachment work smooth and contributes to the efficiency and automation of such work.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are a front view and a side view of the entire chock attaching / detaching device according to the first embodiment of the present invention. As shown in these figures, a chock receiving stand 1 for receiving the load of the roll chock and an elevating stand 2 are provided on a traveling carriage 3. Traveling wheels 5 driven by a traveling motor (not shown) are rotatably provided at the lower four corners of the traveling carriage 3, and on the upper surface of the traveling carriage, the left and right wheels (in the axial direction of the roll chock that constitute the lifting means) are formed. ) A pair of lifting cylinders 4 are erected. That is, the body portion 4 a of the lifting cylinder 4 is pivotally mounted on the traveling carriage 3, and the rod 4 b side is pivotally mounted on the lower surface of the lifting base 2.

A lifting guide 6 is provided at the center of the carriage. That is, a rectangular or pipe-shaped lifting guide 6 as shown in FIG. 4 is erected on the traveling carriage 3, and one end of a guide bar 7 slidably guided in the guide 6 has one end. It is pivotally attached to the lower surface. As shown in FIG. 1, the chock cradle 1 can be lifted and lowered by the simultaneous expansion and contraction operations of the left and right lifting cylinders 4, and the stroke of any one of the lifting cylinders 4 can be changed to move it through the lifting base 2. The posture can be changed in the direction of the arrow. Incidentally, as shown in FIG. 2, a guide mechanism 8 by guide rollers 8a may be attached to both sides of the traveling carriage 3.

A load sensor 9 such as a load cell is arranged between the chock cradle 1 and the lift 2 at least at two left and right positions, preferably at four corners of the chock cradle 1. An electric signal having information about the chock load detected by the plurality of load sensors 9 is sent to the controller 10 described below, and the elevating means is operated by a command from the controller 10.

FIG. 3 is a diagram schematically showing a control system of the device of the present invention. Although not shown in the figure, a controller 10 for controlling the operation of the lifting cylinder 4, that is, the lifting and posture of the chock cradle 1 and a pump unit 11 for driving the lifting cylinder are provided on the traveling carriage 3. ing. Then, an electric signal of information regarding the load value of the roll chock 21 (see FIG. 7) detected by each load sensor 9 is transmitted to the controller 10 via the lead wire 12, and the controller 10 receives this signal, If necessary, an operation signal can be sent to the electromagnetic switching valve 14 via the lead wire 13. Further, a hydraulic line 15 is piped from the hydraulic pump unit 11 to the lift cylinder 4 via the electromagnetic switching valve 14. That is, the controller 10 receives signals from the plurality of load sensors 9 and compares the load value indicated by the signals with the load value (set value) of the optimum condition stored in the controller 10 in advance, If there is a deviation, a signal is sent to a predetermined electromagnetic switching valve 14 to move the valve spool to open / close a predetermined hydraulic port, and a predetermined lifting cylinder 4 is operated to change the posture of the choke cradle 1 and load. The posture of the chock cradle 1 is computer-controlled so that the load value detected by the sensor 9 becomes the set optimum value.

As described above, in the controller 10, it is confirmed that the full load of the roll chock 21 (see FIG. 7) is received, and the load balance is monitored based on the load value information of the plurality of load sensors 9. The attitude of the chock cradle 1 is controlled by operating the lifting means so that these conditions are optimal. The controller 10 also has a check function of monitoring the current value of the traveling motor M (FIG. 3) of the traveling vehicle 3 to determine whether or not the roll chock is pulled out smoothly.

FIG. 5 shows a second embodiment of the device of the present invention. The same components as those in the first embodiment are designated by the same reference numerals. In this embodiment, a cylinder 4A for raising and lowering the whole is provided at the center of the traveling carriage 3, and cylinders 4B for fine adjustment are provided on both sides thereof. In other words, the load sensor 9 is provided between the chock cradle 1 and the elevating table 2 in the same manner, but the intermediate table 17 is provided below the elevating table 2 between them. A fine adjustment cylinder 4B is interposed, and the rod side thereof supports the lifting platform 2 via a spherical bush 16. Therefore, the lift 2 or the chock cradle 1 can be changed in three-dimensional posture, and the degree of freedom of adjustment of the chock cradle 1 is correspondingly increased. In this way, by providing the cylinder 4B for fine adjustment separately from the cylinder 4A for raising and lowering the entire body, it is possible to perform fine posture control of the chock cradle 1.

FIG. 6 shows a third embodiment of the device of the present invention. The same components as those in the first embodiment are designated by the same reference numerals. In this embodiment, a fine adjustment cylinder 4B is provided on only one side in contrast to the second embodiment, and a load sensor 9 is also provided between the support base plate 2a pivotally attached to the lower part of the chock receiving base 1 and an intermediate portion. The load sensor 9 is interposed between the base 17 and the support base 2a pivotally attached to the lower portion of the fine adjustment cylinder 4B. That is, the support base plate 2a substitutes for the lift base 2 (FIG. 1) in the above embodiment. By doing so, the number of fine adjustment cylinders 4B of the second embodiment is reduced by one, and the whole device is made simple and compact.

Now, with reference to FIGS. 3 and 7, the chock attachment / detachment at the time of roll rearrangement work using the chock attachment / detachment device of the first embodiment will be described. In FIG. 7, 18 is a roll stand, 19 is a roll, 20 is a roll shaft, 21 is a roll chock, 22 is a bearing, and 23 is a bearing inner ring. A certain small clearance exists between the roll shaft 20 and the bearing inner ring 23 in consideration of the ease of attaching and detaching the chock.

A) At the time of removing the chock The traveling cart 3 travels on the rail R and is brought below the roll chock 21. At this time, the hydraulic pump 11 is operating. Then, although not shown, the adjust ring is loosened to release the compression of the thrust ring divided into two parts, the thrust ring bolts are removed, the thrust ring is removed from the roll neck 20a, and the roll chock 21 is freed. .. If the lock of the roll and the chock is released with a single touch, and this release means is attached to the side of the traveling carriage, the series of work for attaching and detaching the chock can be fully automated. Next, the electromagnetic switching valve 14 is operated to simultaneously extend the two lifting cylinders 4 to raise the lifting platform 2 or the chock cradle 1, and when the value of each load sensor 9 reaches the set value, the controller 10 is activated. The electromagnetic switching valve 14 is automatically switched in response to a command to stop the extension operation of the ascending / descending cylinder 4. At this time, the total of the load values of the load sensors 9 becomes the weight of the roll chock 21. In addition, the set value for each load sensor 9 is input in advance to the controller 10 as the value in the optimum state at the time of removing the chocks, and when the value of each load sensor 9 is different from the optimum value, that is, when the load balance is bad, The posture of the chock cradle 1 is changed by finely operating a predetermined lifting cylinder 4 under the computer control of the controller 10. When the setting conditions for each load sensor 9 are satisfied, the traveling motor M is started in response to a command from the controller 10, the traveling carriage 3 travels in the direction opposite to the above, and the chocks 21 are removed. If the withdrawal resistance increases due to the one-side contact between the roll shaft 20 and the boss (bearing) 22 (see FIG. 8) during the withdrawal, the controller 10 monitors the change in the current value of the traveling motor M, so the traveling The trolley 3 is stopped, and the controller 10 finely adjusts the lifting cylinder 4 so that the setting conditions for each load sensor 9 are satisfied again, thereby controlling the posture of the chock cradle 1. After that, the extraction operation is continued to extract the roll chock 21.

B) When wearing a chock Basically, the procedure is the reverse of the above-described removal of the chock. In this case, when the insertion of the inner ring 23 of the bearing and the stepped portion of the roll shaft 20 is started, the unbalanced load due to one-side contact is detected by the load sensor 9 as shown in FIG. 8, and the signal is received by the computer control of the controller. By controlling the position of the chock cradle 1 in the vertical direction, a smooth chock can be attached.

It should be noted that it is effective to dispose a rudder bearing or the like on the chock cradle so that the chock cradle part is free from a slight horizontal deviation between the roll shaft 20 and the chock 21. ..

[0021]

[Effect of the device]

 As described above, when the roll chock is attached / detached using the device of the present invention, the following effects can be obtained.

By providing a load (detection) sensor such as a load cell on a chock cradle that has an elevating function using hydraulic cylinders, etc., it is possible to confirm that the entire weight of the chock is being received and to attach a plurality of load sensors. Since the load balance in the chock cradle can be constantly monitored, it is possible to give feedback to the posture control of the choc cradle when the roll shaft and the boss (bearing inner ring) are one-sided, and the speed of the chock attachment / detachment work can be improved. Improves certainty and facilitates automation.

It is possible to quantitatively grasp the qualitative optimum conditions based on the experience of a skilled worker such as a chock support posture at the time of attaching and detaching the chock by load measurement, and high reproducibility can be expected.

As described above, when the device of the present invention is adopted, automation for saving the line stop time and saving labor can be realized, which can contribute to a great improvement in production efficiency.

[Brief description of drawings]

FIG. 1 is a front view of the entire device of the present invention according to a first embodiment.

FIG. 2 is a side view of the same.

FIG. 3 is a schematic system diagram for raising and lowering a chock cradle and controlling the posture thereof.

4 (a) and 4 (b) are cross-sectional views of a lifting guide.

FIG. 5 is a front view of the entire device of the present invention according to the second embodiment.

FIG. 6 is a front view of the entire device of the present invention according to a third embodiment.

FIG. 7 is a front view showing a situation in which a chock attachment / detachment work is performed using the device of the present invention of the first embodiment.

FIG. 8 is a diagram showing a state in which a chock is partially contacted when a roll chock is attached and detached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Chock cradle 2 ... Elevating platform 3 ... Traveling vehicle 4 ... Elevating cylinder (elevating means) 4A ... Whole lifting cylinder (elevating means) 4B ... Fine adjustment cylinder 6 ... Elevating guide 9 ... Load sensor 10 ... Controller 21 ... Roll chock

Claims (1)

[Scope of utility model registration request] 1. A chock cradle that is movable in the axial direction of a roll chock is provided, and the chock cradle is configured to be movable up and down and its posture can be controlled by an elevating means, and to detect the load of the roll chock on the chock cradle. A plurality of load sensors, and a controller for controlling the posture of the chock cradle based on the signals from the plurality of load sensors via the elevating means is provided. .