JPH032326Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rotary straightening machine, particularly a roll elevation adjustment device, which can adjust the position and angle of an hourglass-shaped roll according to the diameter of a tube or round bar that is a material to be straightened.

Generally, large rotary straightening machines are used to improve straightening accuracy. During. The rolls on the exit side are arranged close to each other, and the relative position of the roll drive shaft and the roll stem is such that in the upper straightening roll group, the drive shaft of the central upper roll is under the roll stem holding the upper roll on the entrance side, and The structure is such that the drive shaft of the upper roll on the exit side overlaps with the lower part of the roll stem that holds the upper center roll, and when changing the size of a tube or round bar, the operator visually reads the roll position support meter and gives the operator's push button command. Currently, the motors are activated to raise and lower the rolls simultaneously or individually.

In a rotary straightening machine, the roll height and roll angle must be changed when changing the size of the material to be straightened. If an attempt is made to detect the relative lift amount of the roll using a proximity switch (limit switch) and a striker near the roll stem, the relative position of the proximity switch and striker will shift due to the change in roll angle, making detection impossible. There is a drawback that the proximity switch may malfunction if the scale changes.

For this reason, when making individual elevation adjustments, misreading of the indication scale indicating the relative elevation amount of the rolls or operational errors such as pressing the elevation button incorrectly may cause interference between the roll stem and the drive shaft, resulting in interference between the drive shaft and the roll. The stem could be damaged, and the operator had to pay great attention to the instructions to avoid such problems, resulting in poor work efficiency.

The present invention was devised to eliminate the above-mentioned drawbacks, and a detector for detecting the relative difference in the amount of rotation between adjacent screw shafts is individually rotatably connected to each screw shaft. The amount of lift is detected from the relative difference in the amount of rotation of the screw shaft, and if the detected amount exceeds a set amount, the roll lifting motor that is in the process of lifting is controlled to stop, thereby preventing equipment damage due to operator errors. However, it is an object of the present invention to provide a rotary straightening machine that can safely and quickly adjust the elevation of the upper roll.

Below, the example will be explained with reference to the drawings.
First, in the figure, 1 is an upper hourglass-shaped straightening roll, and 2 is a lower hourglass-shaped straightening roll.These rolls are in an intersecting state when viewed from above, and are attached to a frame 7 by respective brackets 3, 4 and stems 5, 6. On the other hand, it is supported so that it can be raised and lowered and rotated. (See Figures 1 and 2)
In addition, in the straightening roll, A, B, and C are added to the same number to distinguish between the entrance side, the center, and the exit side.

These straightening rolls 1 and 2 are directly connected to a speed reducer and a motor (not shown) via drive shafts 8 and 9 each having a universal joint and a telescoping mechanism, and are electrically controlled so that they rotate synchronously and in reverse. It's getting old.

Hereinafter, details of the elevation control device for the upper hourglass-shaped correction roll, which is the main part of the present invention, will be explained.

In FIGS. 2 and 5, 5 is a stem that holds the upper hourglass-shaped straightening roll 1, 10 is a screw shaft screwed onto the stem 5, and a motor 11 is directly connected to the screw shaft 10. The hourglass-shaped correction roll 1 is adjusted up and down by the operation of the roller.
12 is a synchro oscillator that is directly connected to the screw shaft 10 via a built-in reducer 13 and converts the amount of rotation into a voltage amount, and 14 and 14' are connected to the screw shaft 10 via a built-in reducer 15. The synchro oscillator 12 and the synchro control transformers 14, 14' serve as an electrical detector. 16, 16' are synchro control transformers 14, 1
This is a relay amplifier that outputs a stop signal for the motor 11 to the motor controllers 17, 17', and 17'' when the amount of voltage output from the motor 4' exceeds a set amount.

Since the present invention is constructed in this way, when straightening a pipe or round bar, the lifting and lowering of the rolls can be adjusted by simultaneously raising and lowering the upper group of hourglass-shaped straightening rolls according to the outer diameter, and then adjusting the rolls for straightening the pipe or round bar. In order to provide the amount of offset, the straightening rolls 1A, 1B, and 1C are adjusted up and down individually. Synchro oscillator 12 for simultaneous lifting and lowering
Since the relative angle between the synchro control transformer 14 and 14' does not change, the voltage output also does not change. Therefore, the desired amount of elevation can be adjusted by the operator's push button operation without any inconvenience. When raising and lowering each roll individually, synchro transmitter 12 and synchro control transformer 1
As long as the amount of voltage generated corresponding to the relative angle difference with respect to the rollers 4 and 14' is within the set amount, the roll can be adjusted up and down. However, if there is an operational error and the voltage exceeds the set range, the relay amplifier 1
A strip signal is output from 6, 16' to motor controller 17, 17', 17'', and motor 11 is stopped.

Therefore, the entry side roll holding stem 5 and the central roll drive shaft 8 or the central roll holding stem 5 overlap each other.
Interference damage to the output roll drive shaft 8 can be prevented.

In the above embodiment, a synchro transmitter is directly connected to the central roll lifting/lowering operation screw shaft, a synchro control transformer is directly connected to the input/output roll lifting/lowering screw shaft, and a relay amplifier 1 is connected to the synchro control transformers 14, 14'.
6 and 16', this electric detector is used as a synchro transmitter for all three rolls, and a deviation is provided to indicate the relative angle difference between the two synchro transmitters on the input side and the center or the center and the output side. It is also possible to connect an indicator and operate a micro switch built into the deviation indicator when the pointer swings beyond a specified value, and use the operating signal as a motor stop signal.

As described above, in this invention, when adjusting the upper roll elevation when changing the pipe size, even if the operator makes an operational error such as pressing the roll elevation motor activation push button incorrectly or misreading the roll position display scale, the roll system In addition to preventing interference with the drive shaft and damage to the machine, the upper roll can be adjusted up and down safely and quickly by button operation, contributing to improved work efficiency. A detector that detects the relative difference in the amount of rotation of the screw shafts is individually connected to each screw shaft to rotate, and the relative lifting amount with respect to the adjacent roll is detected from the relative difference in the amount of rotation of the screw shafts, and the detected amount Since the roll lifting motor that is in the process of lifting and lowering is controlled to stop when the roll angle exceeds a set amount, the relative lifting amount of the adjacent rolls can be detected without being affected by changes in the roll angle, and the control is always accurate. It has many effects such as being able to obtain signals.

[Brief explanation of the drawing]

Figure 1 is a front view of the main parts of the rotary straightening machine according to the present invention, Figure 2 is a partially cutaway side view along the line in Figure 1, and Figure 3 is a view of the upper roll group from below along the line in Figure 1. FIG. 4 is a side view taken along the line in FIG. 3, and also shows a state in which the upper roll on the entrance side is excessively lowered. FIG. 5 is a circuit diagram for controlling the elevation of the upper roll group. 1...Trumpet-shaped correction roll, 5...Roll stem,
8... Drive shaft, 11... Roll lifting motor, {1
2... Synchro transmitter, 14, 14'... Synchro control transformer, } Electrical detector, 16, 16'... Relay amplifier, 17, 17', 17''... Motor controller.

Claims (1)

[Scope of utility model registration request] A plurality of rolls are arranged close to each other so that the roll stem and the drive shaft of a roll attached to another roll stem overlap, and a screw shaft that is threaded into each roll stem is rotated by a motor directly connected to the screw shaft. In a rotary straightening machine in which the roll stem is individually raised and lowered by means of the The circuit is equipped with an individual motor controller, and
A rotary straightening machine characterized by comprising a circuit that transmits a stop signal to a motor controller when a relative difference in the amount of rotation between adjacent screw shafts exceeds a set amount.