JPS5930612B2 - How to change the position or posture of steel materials with less impact - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for changing the attitude or position of steel products in a steel transfer line, and more specifically, the present invention relates to a method for changing the attitude or position of steel products in a steel transfer line, and more specifically, the present invention relates to a method for changing the attitude or position of steel products through a pivot mechanism. This invention relates to a method for reducing the impact noise generated when steel comes into contact with the steel.

Conventionally, the apparatus shown in FIG. 1 has been widely used, for example, as an apparatus for changing the posture of steel materials.

In the figure, a drive shaft 3 is connected to a drive motor and a speed reducer (not shown) and rotates in the direction of arrow a.

A link arm 4 is fixed to the drive shaft 3, and an L-shaped link arm 5 is rotatably supported at the other end of the link arm 4.

A pivot 9 is additionally attached to the bent portion 5a of the link arm 5 so as to be rotatable via a rotation shaft 9a provided on the pivot 9.

The other end of the L-shaped link arm 5 is rotatably connected to one end of the V-shaped link arm 8, and the bent portion 8a of the link arm 8 is rotatably supported on the fixed shaft 7, and the link The other end of the arm 8 is rotatably connected to the link arm 6.

The other end of the link arm 6 is attached to be rotatable around a rotating shaft 9b provided on the pivot 9.

1 is an overturning platform 2 that uses steel materials such as rails and roller tables.
It is a steel material placed on top of.

Now, when changing the attitude of the steel material 1 which is in the ■-shaped attitude to the H-shaped attitude in the conventional apparatus having the above configuration, the steel material 1 is rotated by 90 degrees through the operating process shown in Fig. 2 A to C. However, just before the attitude change shown in FIG. 2C is completed, the steel member 1 and the overturning table 2 come into contact with each other due to the downward movement of the pivot 9, and at this time a strong impact sound is generated.

This impact sound is the sound of steel materials colliding with each other, and is extremely loud and irritating, which is harmful to the working and living environments.

Conventionally, as a means to solve this problem, a friction brake is connected to the drive shaft 3 via a friction wheel, and the overturning table 2 is
Attempts have been made to activate the brake just before the steel material 1 comes into contact with the steel member 1, but since a strong torque is acting on the drive shaft 3 during turning operation, a strong braking force is inevitably required, and the wear and tear of the friction wheel is reduced. It was not capable of withstanding extremely frequent operation.

The present invention has been made to solve the above-mentioned conventional problems, and its gist is to change the attitude or position of the steel material through a pivot mechanism provided in the middle of the steel material transfer line. In the method, a hydraulic motor is connected coaxially with the drive motor of the pivot mechanism, and the power supply of the drive motor is cut off before the end of a unit drive cycle of the drive motor, and at the same time, the flow rate of the hydraulic motor is controlled, so that the steel material weight is controlled. The present invention provides a method for changing the position or posture of a steel material with less impact, characterized by ending the drive cycle while damping the generated torque by the hydraulic motor.

An embodiment of the present invention will be described below based on the drawings.

FIG. 3 illustrates an apparatus for carrying out the method of the present invention using a schematic block diagram. Reference numeral 14 denotes an overturning operation section, and the pivot and each link arm mechanism shown in the conventional apparatus are included in this as they are.

Reference numeral 11 is a drive electric motor, which connects the overturning actuator 14 and the drive shaft 3.
, 3a and a reduction gear 10.

12 is a hydraulic brake circuit coaxially connected to the drive motor 11 through a drive shaft 3b.

Reference numeral 13 denotes a pivot position detector, which detects the operating position of the pivot 9 from the drive shaft 3 rotating in correspondence with a predetermined operating position of the pivot 9, and detects the operating position of the pivot 9 based on the detection signal.
The hydraulic brake circuit 12 is also controlled to turn on and off.

Note that the pivot position detection device 13 only needs to be able to obtain a detection signal corresponding to the rotation angle of the drive shaft 3, so the detection method is to install an eccentric disk coaxially with the drive shaft 3;
Any known technique may be used, such as a contact type combining the eccentric disk and a limit switch that makes contact with the eccentric disk, or a slit disk mounted coaxially with the drive shaft 3, such as a method of non-contact position detection using a phototube. .

FIG. 4 shows the operating cycle of the pivot 9 when the posture is changed, and the dashed line Q represents the locus of the corner portion 9c of the pivot 9.

Next, the control order of the drive motor 11 and the hydraulic brake circuit 12 based on the detection signal obtained from the pivot position detector 13 will be explained.

The corner part 9c that lifts up the steel material (not shown) with the pivot 9 at point A in FIG. When this point is reached, the pivot position detector 13 detects this, cuts off the current to the drive motor 11, and simultaneously sends a signal to start the hydraulic brake circuit 12.

The descending speed of the pivot 9 carrying the steel material is reduced due to braking by the hydraulic brake circuit 12, and the steel material is reduced to zero.
Since it contacts the overturning table 2 at a point, the impact is extremely small.

After the steel material is placed on the overturning table 2, only the pivot 9 is further lowered, but when it reaches point D immediately after being placed, it acts to stop the hydraulic brake circuit 12 and at the same time return and drive the drive motor 11. .

Point E indicates the standby position in preparation for the start of the next attitude change.

Next, the operating sequence of the hydraulic brake circuit 12 will be explained in more detail with reference to FIG.

In the figure, 16 is an electromagnetic switching valve, and the position detector 1
According to the detection signal from No. 3, the circuits can be switched to three.

In other words, when applying the brake to the drive motor 11, use the switch port (■), when stopping the brake circuit 12, use the switch port θ, and when operating the drive motor 11 at normal speed without operating the brake. When activated, each circuit is selected at the @ position.

17 is a flow control valve, 18a to 18f are check valves, 19 is an IJ-F valve provided for protection when the pressure in the piping system increases abnormally, and 20 is for suppressing a rise in oil temperature. The oil cooler, 21, is an oil storage tank.

In the brake circuit configured as described above, first, in the sections where the first drive motor 11 operates in a non-braking state (trajectories E, A, B sections and E sections in Fig. 4), the electromagnetic switching valve 16 is at the neutral position of @. Since the amount of oil flowing through the hydraulic motor 15 is not limited, the drive motor 11 coaxially connected to the hydraulic motor 15 operates in a non-braking state.

Next, in the section where the brake is applied (sections B and D in FIG. 4), first, at point B in FIG. 4, the electromagnetic switching valve 16 is switched to the switching port (2), and the power to the drive motor 11 is cut off.

Therefore, the amount of oil flowing out from the hydraulic motor 15 is determined by the flow control valve 1.
7, the hydraulic motor 15 operates as a hydraulic brake, and the steel material 1 mounted on the pivot 9 is supported by hydraulic pressure according to the opening degree of the flow rate regulating valve 17, while its descending speed is reduced. The steel material 1 is placed on the overturning table 2 at point C in Figure 4.

Next, when the fourth control point is reached, the drive motor 11 starts, the electromagnetic switching valve 16 returns to the neutral position, and the drive motor 11 enters the non-braking state.

If you want to temporarily stop the pivot 9 during the brake operation, set the switching port of the electromagnetic switching valve 16 to O, so that the oil flowing out from the hydraulic motor 15 will not flow beyond the check valve 18a, so the pivot 9 can be stopped. It can be brought to a complete stop using hydraulic brakes.

As described above, in a method for changing the posture or position of a steel material using a pivot mechanism, the present invention reduces the descending speed of the steel material immediately before placing the steel material on the overturning table, thereby preventing contact between the steel material and the overturning table. Since the impact can be reduced, the impact noise upon contact becomes extremely small.

Moreover, since the hydraulic brake is activated only before and after placing the steel material on the overturning table during the pivot operation cycle, there is little loss of efficiency, and a simple hydraulic brake circuit is added to the conventional throat pot mechanism. You can achieve your goal just by doing so.

Figure 6 shows the relationship between the collision speed m/s of a steel material against an overturning table and the impact sound dB (A) based on the inventor's experiment, and shows the relationship between the impact sound dB (A) and the impact sound when the steel material is placed using the conventional pivot mechanism alone. The collision speed is about 0.5 to 0.6 m/s, and the impact sound at that time is 110 dB (A) or more. However, if the collision speed is set to around 0.1 m / 3 using the method of the present invention, for example, the impact sound will be reduced. This has resulted in a significant improvement in the working environment.

[Brief explanation of drawings]

Fig. 1 is a schematic side view showing a conventional pivot mechanism for changing posture, Figs. 2A to 2C are schematic side views illustrating the operation of the pivot mechanism, and Fig. 3 is a schematic diagram of a device for carrying out the method of the present invention. 4 is a schematic side view showing the operation locus during pivot operation of the method of the present invention; FIG. 5 is a system diagram showing an embodiment of the hydraulic brake circuit used in the method of the present invention;
FIG. 6 is a graph showing the relationship between the collision speed and impact sound of a steel material against an overturning platform. 1... Steel material, 2... Overturning table, Meter... Drive shaft, 4, 5
゜6.8...Link arm, 7...Fixed shaft, 9...
- Pivot, 10...Reducer, 11...1 drive motor, 12...Hydraulic brake circuit, 13...Pivot position detector, 15...Hydraulic motor, 16...Solenoid switching valve, 17...Flow rate adjustment valve, 18a-18f...Check valve, 19...IJ IJ-fu valve, 20...Oil cooler, 21...Oil storage tank.

Claims (1)

[Claims] 1. In a method for changing the posture or position of a steel material through a pivot mechanism provided in the middle of a steel material transfer line, a hydraulic motor is connected coaxially with the drive motor of the pivot mechanism, and the unit of the 1 drive motor is A steel material with low impact, characterized in that the drive cycle is completed while the torque generated by the weight of the steel material is buffered by the hydraulic motor by cutting off the power to the drive motor and controlling the flow rate of the hydraulic motor at the same time before the end of the drive cycle. How to change the position or posture of.