JPH11169936A - Transporting device for steel bar hot rolling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a countermeasure to the change of the diameter of a steel bar and to save the manpower of adjusting operation by providing an air cylinder for adjusting rolling force on a pinch roller and enabling fine adjustment of pinching force. SOLUTION: The air cylinder 51 for adjusting the rolling force of the pinch roll which is operated with a pneumatic circuit is fixed on the push-up plate 37 of a transporting device and a fork end 36 for lifting one end of a lower roller bracket 23 is vertically supported with the rod. The pneumatic circuit consists of a pressure reducing valve for setting rolling force and solenoid valve for switching the circuit corresponding to each size of the steel bar and deals with reduction of time at the time of changing the rolling size of the steel bar. With two sets of worm screw type screw-down adjusting devices 52, 52, the adjustment of the height of the upper pinch roller to that of the traveling line and the adjustment of the height of position regulating stopper 42 of the push-up plate 37 are enabled. Moreover, at the time of transporting the steel bar, by elevating the pinch roller with the air cylinder after the elapse of a prescribed time after the tip of the steel bar is passed through a pinch roller setting part, the transportation is smoothed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch roller with a shock absorber provided, for example, at an intermediate portion of a conveying device of a hot-rolled steel bar.

[0002]

2. Description of the Related Art Steel bars which are hot-rolled in a steel bar hot-rolling facility and run at high speed in a conveying device are braked and stopped by being lowered by a pinch roller. At that time, in order to prevent the occurrence of a mistrouble due to the bending of the rolled long steel bar due to the speed imbalance based on the impact drop of the steel bar or to prevent the pressure flaw by the pinch roller, the present inventors et al. As disclosed in Japanese Patent Application Laid-Open No. 3-101306, there has been proposed a transfer device in which a buffer is provided in addition to the pinch roller. The shock absorber attached to the pinch roller rotatably supports one end side of the bracket supporting the pinch roller, and the other end side changes the roller interval in a state where elastic force is urged by a spring. It was done.

FIG. 7 and FIG.
No. 06 is a side view and a front view showing a pinch roller with a shock absorber of the transfer device of the steel bar hot rolling equipment disclosed in Japanese Patent Publication No. 06, the pinch force of the long steel bar by the upper pinch roller 22 and the lower pinch roller 21, A desired value is set by changing the tightening amount of the nut 47 of the lifting rod 35. The gap between the upper pinch roller 22 and the lower pinch roller 21 is formed between the upper pinch roller 22 and the lower pinch roller 21 with a pass line through which the long steel bar passes.
The adjustment is performed by adjusting both the roller bracket position adjusting screw 29 and the stopper 42 so that the desired gap amount is obtained at a position symmetrical with respect to FIG. The lower pinch roller 21 is always opened by lowering the push-up plate 37 by the rod 40 of the air cylinder 39. After the elapse of a predetermined time after the tip of the long bar passes through the pinch roller installation portion, the air cylinder 39 is operated to raise the lower roller 21 so that the long bar can be pinched.

[0004]

However, the conveying device of the above-described hot-rolled steel bar equipment has the following problems. (1) Even if the diameter of the rolled material is small or large, and the change in the elliptical shape or the like is small, The set pinch force is not maintained and fluctuates. The spring constant of the coil spring cannot follow this slight change, causing a misroll due to insufficient pinch, or, when the diameter of the rolled material is large, causing a press mark due to excessive pinch. (2) Although the pinch force is set by changing the amount of tightening of the lock nut, it is difficult to make a fine setting with a slight difference. Therefore, the setting must be set to have a large error to some extent, and an adjustment operation is performed every time the rolling size changes, and the time required for the size change increases. (3) Since the gap between the upper and lower rollers is adjusted by a screw and a lock nut, there is a problem in workability. Also, the scale that falls from the rolled material enters the thread,
The rotation of the lock nut becomes difficult. Therefore, further improvement has been desired.

[0005] The present invention has been made in view of the above points, and since the pinch force can be finely adjusted, it is possible to sufficiently cope with a slight change in the outer diameter of the rolled material. Another object of the present invention is to provide a transfer device for a hot-rolled steel bar capable of easily performing a hot-rolling operation.

[0006]

According to the present invention, there is provided a conveyor for a hot-rolled steel bar equipment according to the present invention, comprising: a pinch roller which presses and brakes a hot-rolled and running steel bar from above and below;
A mechanism capable of finely adjusting the rolling force for pinching by supporting the pinch roller via a pinch rolling force adjusting air cylinder so as to be vertically displaceable.

[0007] Further, in order to be able to cope with a reduction in the time required for changing the rolling size of the hot-rolled steel bar, the solenoid valve for switching the air pressure circuit to be supplied to the air cylinder for adjusting the pinch rolling force and the pressure are switched. And a pressure reducing valve.

In addition, a pinch roller for pressing down a hot-rolled and traveling steel bar from above and below for braking, and an upper roller bracket for adjusting the height of the pinch roller to the height of a traveling line of the rolled steel bar. It is equipped with a worm screw type screw down adjustment device that can easily adjust the rotation of the position adjustment screw and the height of the stopper that regulates the vertical position of the push-up plate by rotating the stopper position adjustment screw. is there.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a front sectional view of a main part of a transfer device of a steel bar hot rolling facility according to a first embodiment of the present invention. FIG. 2 is a side sectional view of the main part.
In the drawing, a lower pinch roller 21, an upper pinch roller 22, and a casing 2 to which a bearing of the lower pinch roller 21 is fixed for braking a steel bar which is hot-rolled and travels at a high speed.
5, a lower roller bracket 24 that supports a casing 26 to which the bearing of the upper pinch roller 22 is fixed, and a lower roller bracket rotation shaft 27 that rotatably supports one end of the lower roller bracket 23. And an upper roller bracket rotating shaft 2 that rotatably supports one end of the upper roller bracket 24.
8, upper roller bracket position adjusting screw 29 for raising and lowering the position of upper pinch roller 22, female screw body 30,
Head 33, lifting body 34, lower roller bracket 23
End 36 and cylinder 39 for lifting the other end of the cylinder
It has a push-up plate 37 which is supported from below and whose upper and lower positions are regulated by a stopper 42 from above as in the prior art.

Reference numeral 51 denotes an air cylinder for adjusting a pinch rolling force, which is fixed on a push-up plate 37, and a rod of which vertically supports a fork end 36 for lifting the other end of the lower roller bracket 23. The pinch rolling force adjusting air cylinder 51 is operated by a pneumatic circuit shown in the system diagram of FIG. In the present embodiment, it is possible to cope with a reduction in the time required for changing the rolling size of a hot-rolled steel bar. In the present embodiment, an example in which the present invention is applied to three sizes is shown. And a pressure reducing valve 5 for setting a pinch pressure reduction force according to each size.
4, 55, 56 and a solenoid valve 5 for switching the circuit
3 Switching of the set pressure can be performed by remote control, and the set pressure can be easily set by a pressure reducing valve. Also, as is clear from the graph comparing the spring constants of the air spring type and the coil spring type shown in FIG. 6, the air spring type having a smaller spring constant has a smaller increase in pressure with respect to a change in the gap amount. An optimum pinch rolling force can be set for the rolling size. In the coil spring type, if an attempt is made to obtain a spring constant equivalent to that of the air spring type, the coil length becomes extremely long, and it is difficult to achieve the structure.

Reference numeral 52 denotes a worm screw type screw down adjusting device. One of the two sets includes an upper roller bracket position adjusting screw 29 for adjusting the height of the upper pinch roller to the height of the running line of the rolled steel bar. Rotate.
Another set of the worm screw type screw down adjusting device 52 is a stopper for regulating the vertical position of the push-up plate 37 by rotating the stopper position adjusting screw 29a screwed into the female screw body 30a. Adjust the height of 42. In addition, since the worm screw type draft adjustment device 52 is incorporated in the gear case, it is possible to prevent the scale from entering.

In the transport device of the steel bar hot rolling equipment configured as described above, the lower pinch roller 21 is always opened by lowering the push-up plate 37 by the air cylinder 39. After a lapse of a predetermined time after the tip of the long bar passes through the pinch roller installation section, the air cylinder 39 is operated to raise the lower pinch roller 21, whereby the long bar is pinched and can be smoothly transported. At that time, the alignment of the caliber on the lower side of the upper pinch roller 22 with the pass line as an initial setting is performed by rotating the upper roller bracket position adjusting screw 29 by the worm screw type pressure adjusting device 52,
The upper roller bracket 24 is in a predetermined position. The upper limit of the pass line of the caliber on the upper side of the lower pinch roller 21 is set by adjusting the height of the stopper 42 by rotating the stopper position adjusting screw 29 a by the worm screw type adjusting device 52. Is in a predetermined position. The pinch force of the long bar by the upper pinch roller 22 and the lower pinch roller 21 is set to a desired value by adjusting the pressure of the air cylinder 51 for adjusting the pinch pressure. Upper pinch roller 22 and lower pinch roller 2
The gap between the upper roller bracket position adjusting screw 29 and the upper roller bracket position adjusting screw 29 so that the upper pinch roller 22 and the lower pinch roller 21 have a desired gap amount at a symmetrical position across a pass line through which the long bar passes. The adjustment is performed by adjusting both of the stoppers 42.

Embodiment 2 FIG. FIG. 3 is a front sectional view of a main part of a transfer device of a steel bar hot rolling facility according to a second embodiment of the present invention. FIG. 4 is a side cross-sectional view of the main part. In the first embodiment, the lifting plate 37 is moved from above with the stopper 4
2, the vertical position is regulated. In the second embodiment, however, the push-up plate 37 is supported only by the cylinder 39 from below, and is not regulated from above.

In the second embodiment configured as described above, the lower pinch roller 21 is
As a result, the push-up plate 37 is lowered to be in a normally open state. After a lapse of a predetermined time after the tip of the long bar passes through the pinch roller installation portion, the air cylinder 39 is operated to raise the lower pinch roller 21,
The long bar is pinched and can be transported smoothly. At this time, the alignment of the caliber on the lower side of the upper pinch roller 22 with the pass line as an initial setting is performed by rotating the upper roller bracket position adjusting screw 29 by the worm screw type pressure adjusting device 52, and Is in a predetermined position. And
The gap between the upper pinch roller 22 and the lower pinch roller 21 is adjusted by the air cylinder 51 for adjusting the pinch pressure.
By controlling the capacity, the stroke end of the air cylinder 51 for adjusting the pinch rolling force can be controlled by controlling the stroke end to a desired gap amount.

[0015]

As described above, according to the present invention, the air cylinder and the solenoid valve circuit allow the pinch rolling force to follow a minute material shape change, and the rolling size change
The pinch rolling force can be easily set, and the reproducibility of the rolling force is excellent, which contributes to the stabilization of the operation. Also, it is excellent in following up the variation of the product shape, and has little vibration and noise. In addition, the provision of a worm screw type pressure adjustment device makes it easy to adjust the gap between the upper and lower rollers, and allows direct adjustment of the gap by directly connecting the drive source, making it possible to adjust the gap by remote control, saving labor when changing sizes. The gap can be adjusted during the operation.

[Brief description of the drawings]

FIG. 1 is a front partial cross-sectional view of a transfer device of a steel bar hot rolling facility according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional side view of a transfer device of the steel bar hot rolling equipment according to Embodiment 1 of the present invention.

FIG. 3 is a front partial cross-sectional view of a transfer device of a steel bar hot rolling facility according to a second embodiment of the present invention.

FIG. 4 is a partial side cross-sectional view of a transfer device of a steel bar hot rolling facility according to a second embodiment of the present invention.

FIG. 5 is a system diagram showing a pneumatic circuit connected to an air cylinder for adjusting a pinch rolling force of the transfer device of the steel bar hot rolling equipment according to Embodiment 1 of the present invention.

FIG. 6 is a graph showing a difference between a spring constant according to the first embodiment of the present invention and a conventional technique.

FIG. 7 is a side view showing a transfer device of a conventional steel bar hot rolling facility.

FIG. 8 is a front view showing a transfer device of a conventional steel bar hot rolling facility.

[Explanation of symbols]

 51: Air cylinder for pinch reduction force adjustment 52: Worm screw type reduction device

Claims (3)

[Claims] 1. A pinch roller for rolling down a hot-rolled traveling steel bar to sandwich it from above and below, and supporting the pinch roller to be vertically displaceable via a pinch rolling force adjusting air cylinder. And a mechanism capable of finely adjusting the rolling force for pinching. 2. A solenoid valve for switching a circuit of an air pressure supplied to an air cylinder for adjusting a pinch rolling force so as to be able to cope with a reduction in the time required for changing the rolling size of a hot-rolled steel bar. The conveying device for a hot-rolled steel bar according to claim 1, further comprising a pressure reducing valve. 3. A pinch roller for rolling down a hot-rolled steel bar to sandwich it from above and below, and an upper roller bracket for adjusting the height of the pinch roller to the height of a running line of the rolled steel bar. A worm screw-type pressure adjustment device that can easily adjust the rotation of the position adjustment screw and the height of the stopper that regulates the vertical position of the push-up plate by rotating the stopper position adjustment screw is provided. The conveying device for a steel bar hot rolling facility according to claim 1 or 2, wherein: