JP2001219371A - Roll starting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple roll starting device capable of smoothly certainly starting a roll without requiring a motor and a transmission mechanism of large capacity. SOLUTION: A rotating plate 34 on an outer peripheral part of which continued teeth are formed is provided on a pulley 28 to transmit torque of a driving motor 21 to a face plate 20 of a spindle stock, a cylinder 32 for starting having an engaging part 37 to be engaged with the teeth of the rotating plate 34 free to be engaged and disengaged with them on a head end part of a piston rod and to add starting torque to the rotating plate 34 is provided on the spindle stock free to oscillate, and an oscillating cylinder 42 to oscillate the cylinder 32 for starting to engage the teeth of the rotating plate 34 and the engaging part 37 with each other is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll starting device for applying a starting torque when starting operation of a headstock that rotationally drives a roll to be ground in a roll grinding machine.

[0002]

2. Description of the Related Art FIG. 4 shows a roll grinder for grinding a roll of a rolling mill.

In FIG. 1, reference numeral 10 denotes a grindstone head,
Denotes a tailstock, and 12 denotes a headstock. The grindstone table 10 is provided so as to be movable on the carriage 13 in the X-axis direction. A grindstone 14 is provided on the grindstone table 10 so as to face at right angles to the axial direction of the roll 15. The grindstone 14 moves back and forth (X-axis direction) with respect to the roll 15 by an infeed mechanism (not shown). Then, a cut can be given to the roll 15. Carriage 13
Are driven in the Z-axis direction by driving a ball screw by a servomotor. A guide rail for guiding the ball screw and the feed motion is a telescopically nested sliding surface cover 17.
And its sliding surface is protected.

On the other hand, the tailstock 11 can be moved in the Z-axis direction using a pinion rack mechanism along a rack 16 extending in the Z-axis direction parallel to the axial direction of the roll 15. I have.

The headstock 12 includes a face plate 20 for transmitting a driving torque to the roll 15 and a belt transmission mechanism for transmitting the driving torque of a motor (not shown) to the face plate 20.

[0006] In such a roll grinding machine, the tailstock 11
A pair of receiving stands 18a and 18b supporting the roll 15 are disposed between the headstock 12 and the headstock 12, and the roll 15 is rotatably supported by the receiving stands 18a and 18b at shoulder portions at both ends thereof. ing. The pedestal 18 is provided with a metal support that supports the end of the roll so that it can rotate while sliding.

[0007]

The roll 15 to be ground
Is a heavy object, the inertia when the rotation of the roll 15 is started is very large, and the pedestal 18
Since the rotating start must be performed from the stationary state against the static friction force between the receiving members a and 18b, a very large starting torque is required as compared with the torque transmitted to the roll 15 during grinding. . For this reason, the conventional headstock 12 requires a large-capacity motor capable of covering a large starting torque, or a motor for generating a high starting torque and a gear transmission mechanism for transmitting the starting torque to the face plate 20 are separately provided. I have.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a simple and reliable roll start-up system without the need for a large-capacity motor or transmission mechanism. A roll activation device is provided.

[0009]

In order to achieve the above object, the present invention provides a roll starting device for rotating and starting a roll centered between a headstock and a tailstock. A rotary plate having continuous teeth formed on an outer peripheral portion thereof is provided on a pulley for transmitting the torque of the drive motor to the board, and an engaging portion which engages with the teeth of the rotary plate in a detachable manner is provided at a distal end portion of the piston rod. A starting cylinder for applying a starting torque to the rotating plate is provided on the headstock so as to be swingable, and a swing cylinder for swinging the starting cylinder is provided for engaging the engaging portion with the teeth of the rotating plate. It is characterized by having.

According to the present invention, at the time of starting, the swinging cylinder rotates the starting cylinder, and the engaging portion of the piston rod of the starting cylinder is engaged with the teeth of the rotating plate. In this state, the starting cylinder pulls or pushes the piston rod to apply a large starting torque to the rotating plate, thereby rotating the rotating plate and the face plate, and rotating the roll against inertia force and static friction force with the cradle. Let it. When the rotating plate is rotated by a predetermined angle, the engaging portion of the starting cylinder is disengaged from the teeth of the rotating plate, but the roll continues to rotate by inertia force as it is, so that a predetermined timing from the starting by the starting cylinder is required. Thus, if the drive motor is started, it is possible to smoothly shift to roll rotation drive for grinding.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a roll starting device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a headstock 12 of a roll grinder to which a roll starting device according to the present invention is applied. 2
Reference numeral 1 denotes a drive motor that is a drive source of the headstock 12. The rotational power of the drive motor 21 is transmitted to the face plate 20 from the following belt transmission mechanism.

A pulley 22 attached to an output shaft of a drive motor 21 and a pulley 24 of a rotating shaft 23 have a belt 2
5 is wound. As shown in FIG.
A belt 29 is wound around a pulley 27 attached to the rotating shaft 23 and a pulley 28 integrated with the main shaft 26. Therefore, the driving torque of the driving motor 22 is transmitted to the main shaft 26 via the belt transmission mechanism provided in two stages. The face plate 20 shown in FIG. 1 is configured to be attached integrally with the pulley 28. At the center of the face plate 20, a work center 30 for centering a roll to be ground with a tailstock (not shown) is attached. The torque transmission from the face plate 20 to the roll is performed via the kelley 31.

In FIG. 2, reference numeral 32 denotes a starting cylinder which constitutes a roll starting device according to the present invention.
Is a rotary plate mounted coaxially with the pulley 28. The rotating plate 34 is formed with continuous wavy teeth on its outer peripheral portion. The starting cylinder 32 is arranged in a direction parallel to the rotating plate 34 (perpendicular to the axial direction of the main shaft 26), and is swingably supported by the headstock via a clevis 33 and a pin 35. This starting cylinder 32
The piston rod 36 extends right above the rotary plate 34, and the distal end portion of the piston rod 36 has an engaging portion 3 that engages with the teeth of the rotary plate 34 in a detachable manner.
7 is attached. The linear movement of the engaging portion 37 is caused by the guide bar 3 extending in the axial direction of the starting cylinder 32.
8 is guided by a slide block 39 which slides along.

The teeth of the rotary plate 34 are composed of a ridge portion 40 and a valley portion 41. The valley portion 41 has a cylindrical engaging portion 37 which fits smoothly from the circumferential direction. It is curved so that it can be separated.

In order to engage the engaging portion 37 and the teeth of the rotary plate 34 below the starting cylinder 32,
A swing cylinder 42 for swinging the starting cylinder 32 is arranged. The tip of the piston rod 43 of the oscillating cylinder 42 is pin-connected to the starting cylinder 32 via a connecting member 44.

The roll starting device according to the present embodiment is configured as described above. Next, the operation and effects of the device will be described. FIG. 2 shows the positions of the starting cylinder 32 and the swing cylinder 42 before starting. Before this start-up, the piston rod 43 of the swing cylinder 42 is in an extended state, whereby the starting cylinder 32 is supported in a horizontal posture. Then, the piston rod 43 of the oscillating cylinder 42 is retracted, and the starting cylinder 32 is rotated clockwise about the pin 35 in the figure. Thereby, as shown in FIG. 3, the engaging portion 37 provided at the tip of the piston rod 36 of the starting cylinder 32 engages with one of the tooth valleys 41 of the rotating plate 34. When the starting cylinder 32 is operated to retract the piston rod 36 in the engaged state with the rotating plate 34, the starting cylinder 32 moves the engaging portion 37 together with the rotating plate 34 in the circumferential direction. Therefore, a large starting torque is applied to the rotating plate 34. As a result, in FIG. 1, the face plate 20 and the roll (not shown) start rotating against their large inertial force and the static friction force generated between the roll and the cradle.

The piston rod 36 of the starting cylinder 32
Is retracted by one stroke, and when the rotating plate 34 rotates by a predetermined angle, the engaging portion 37 of the starting cylinder 32 is rotated.
Is separated from the teeth of the rotating plate 34, but the face plate 20 and the roll continue to rotate by inertia force.

After the roll starts rotating, the drive motor 21 is started with a predetermined timing delay. At this time, since the face plate 20 and the roll have already started to rotate, a large load is not applied to the drive motor 22 at the time of startup, and the roll is rotated by the drive torque transmitted from the drive motor 22 via the belt transmission mechanism, so that the drive motor 22 smoothly rotates. The process can be shifted to grinding.

[0020]

As is apparent from the above description, according to the present invention, a pulley for transmitting the torque of a drive motor to a face plate of a headstock is provided with a rotary plate having continuous teeth formed on an outer peripheral portion thereof. A starting cylinder for applying a starting torque to the rotating plate is provided on the headstock so as to be swingable, having an engaging portion at the distal end of the piston rod for removably engaging the teeth of the rotating plate. Since the oscillating cylinder for oscillating the starting cylinder for engaging the teeth of the rotating plate with the portion is provided, without requiring a large-capacity motor or transmission mechanism,
It is possible to provide a simple roll starting device capable of starting the roll smoothly and reliably.

[Brief description of the drawings]

FIG. 1 is a side view showing a headstock of a roll grinding machine to which a roll starting device according to the present invention is applied.

FIG. 2 is a view taken along line II-II in FIG. 1 showing one embodiment of the roll starting device according to the present invention.

FIG. 3 is a front view showing the operation of the roll starting device according to the present invention.

FIG. 4 is a perspective view showing a conventional roll grinder.

[Explanation of symbols]

 Reference Signs List 12 headstock 20 face plate 21 drive motor 23 rotating shaft 25 belt 26 main shaft 28 pulley 29 belt 30 work center 32 starting cylinder 34 rotating plate 37 engaging portion 42 swing cylinder

Claims (1)

[Claims] 1. A roll starting device for rotating and starting a roll centered between a headstock and a tailstock, wherein a continuous tooth is formed on a pulley for transmitting a torque of a driving motor to a face plate of the headstock. A rotating plate formed at the distal end of the piston rod to engage with the teeth of the rotating plate in a detachable manner so as to swing a starting cylinder for applying a starting torque to the rotating plate. A roll starting device provided on a headstock and further provided with a swing cylinder for swinging the starting cylinder to engage the teeth of a rotating plate with the engaging portion.