JPS5852558B2 - Pitting type vibration pickling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pickling device, and more particularly to a pitching type vibrating pickling device in which the vibration of a vibrating device resonates with the pitching vibration of a coil to be pickled.

Both chemical and mechanical methods can be applied to remove scale on metal wires, but chemical methods, such as suspending a coiled wire from a hairpin hook and attaching it to an acid Batch-type pickling is generally carried out in which scale is chemically removed by immersing the material in an acid solution in a washing tank.

The scale removal efficiency by such pickling depends on the acid concentration, temperature, and immersion time, but if the coiled wire is simply kept stationary in the acid solution, the wire will be suspended tightly on the hook. Penetration of the acid solution is slow and scale removal is inconsistent, resulting in longer pickling time and poorer finish quality.

Therefore, during pickling, it is common practice to vibrate the wire rod up and down by vibrating the hanging hook.

The weight of the wire rod coil to be pickled is 1.0 to 2.5 tons (about 1.8 tons on average), and the spring constant required to give sufficient vibration amplitude using conventional equipment is 500 Y'4
f /ru~3600 Kf f 71g11, and its rigidity becomes considerably large.

However, it is difficult to use a coil spring with such high rigidity when considering the size of the device, and at present, springs with an average strength of 900 kgf/[ are used.

Therefore, with this level of spring constant, the natural frequency of the vibration system consisting of the wire coil and hanging arm cannot match the rotational speed of the motor and resonate, and the vibration amplitude is quite small, so the pickling effect is sufficient. I couldn't say that.

An object of the present invention is to provide a pitching vibrating pickling device in which the hook vibrates pitching while resonating with the rotational speed of a motor to increase the amplitude of pickling, unlike conventional pickling devices in which the hook vibrates up and down.

The present invention will be described below with reference to the drawings.

First, referring to FIG. 1, an acid tank 1 is filled with an acid solution 2, and vibration isolating tables 3 are provided on both sides.

The tops of these vibration isolating tables 3 are supported by elongated hook receivers 4 and 5, and a vibrator 6 for generating vibration force is attached to the lower surface of the hook receivers 4.

The wire coil hanging hook T consists of an upper long main beam 8 and an L-shaped hook part 9 attached to the lower surface of the main beam. It is removably placed on the seat 4.

Furthermore, a U-shaped metal fitting 10 for suspending the hook 7 by a crane or the like (not shown) is fixed to the upper surface of the main beam.

Since the hook T is installed on the hook receiver 4 as shown in FIG. 1 with a large number of coil bundles 11 suspended from the single-shaped hook portion 9, the coils 11 are immersed in the acid solution 2. .

When the vibrator 6 vibrates in this state, the 1-shaped hook portion 9 vibrates and the coil 11 also starts vibrating, thereby increasing the pickling effect.

Next, referring to FIG. 2, hook T, coil 11 and spring 5
We quantitatively analyze the vibrations of a vibrating system consisting of.

This figure is a model of the vibration system shown in FIG.

The X axis is in the longitudinal direction of the hook catch seat 4, the Y axis is in the direction of the main beam 8 of the hook, and the two axes are in the vertical direction.

When the excitation force of the vibrator is Fsinθ, the vibration amplitude Z in the vertical direction is as follows.

In this case, the current amplitude cannot be said to be ideal because the spring constant cannot be selected to a relatively large value due to the size of the device.

When pitching is used, even if the spring constant is relatively small, it is possible to match the motor rotation angular velocity to the pitching frequency.

In other words, the pitching frequency is determined from the model in Figure 2. is given by

Here, Ix is the moment of inertia around the X axis when the hook pitches, so! ! 1.112
If is set as large as necessary, the pitching frequency becomes equal to the motor rotational angular velocity, and a resonant state is obtained.

Therefore, the amplitude of the wire coil becomes large and the pickling effect is improved.

Note that since this pitching frequency cannot be changed by changing the weight of the coil, it is preferable to adjust the moment of inertia Ix to a predetermined value by adjusting the position r of the wire coil.

FIG. 3 shows the relationship between the natural frequency of the vibration system and the angular frequency of the motor.

In the figure, ω□ is the vertical natural frequency of the vibration system, ω2 is the pitching natural frequency of the vibration system, ω0 is the angular frequency of the motor, and Z is the vertical vibration amplitude.

It can be seen from this figure that when the pitching natural frequency becomes equal to the angular frequency of the motor, the amplitude 2 increases significantly.

Therefore, in the pitching type vibration pickling device according to the present invention, there is no need to make the spring constant particularly stiff in a limited space, and by adjusting the length of the hook, the hanging position of the wire coil, etc., the motor rotation It is possible to resonate at a pitching frequency that matches the number.

Therefore, by improving the pickling effect, the pickling time is shortened and the finishing quality is improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a pitching type vibration pickling device according to the present invention, Fig. 2 is a schematic diagram showing a model for quantitatively analyzing the vibration of the pickling device shown in Fig. 1, and Fig. 3 is a perspective view showing a pitching type vibration pickling device according to the present invention. is the natural frequency ω0 of the pickling device according to the present invention. ω2, angular frequency ω of the motor. It is a figure which shows the relationship between and maximum amplitude Zmax. 1...--Acid tank, 2...--Acid solution, 3...-
・Vibration isolation table, 4...Hook catch, 5...
Spring, 6... Vibrator, T... Hanging hook, 8... Main beam, 9... Curved hook part, 10... Curved U-shaped metal fitting, 11 ...Wire, coil.

Claims (1)

[Claims] 1. It has a main beam with a total length of 1=l11+12, and a coil-hanging hook is attached at a point 11 from one end of the main beam, and an r-shaped hook is attached from the attachment end of the hook. The coil is suspended so that its center of gravity is located at a distant position, and the end of the main beam has a spring constant K. It is supported on the pickling tank with vibration isolation so that it can freely swing up and down with springs, and the vibration angular velocity at the end of this main beam is (where n is the number of vibration isolation springs and g is the gravitational acceleration). A vibratory pickling device characterized in that the coil suspended from the hook is pickled while being resonantly pitched by a vibrating device.