JPS58107423A - Impeller of apparatus for continuously quenching steel plate - Google Patents

Abstract

PURPOSE:To rapidly and uniformly perform the effect of cooling a steel plate with the movement of cooling water, by attaching blades having a specified configuration to the rotary shaft of an impeller for agitating cooling water provided in a water tank for quenching the steel plate. CONSTITUTION:An impeller 132 for moving cooling water is used to carry the cooling water at a high speed along a direction opposite to the running direction of a steel plate inside a water tank for rapid cooling in an apparatus for quenching the steel plate. Four pieces of blades 140 are provided at the periphery of the rotary shaft 136 of the impeller along the longitudinal direction of the rotary shaft 136 in the same intervals along its radial direction. The blades 140 are helically attached to the rotary shft 136 in a manner such that the angle alpha of torsion of the blades to a hypothetical plane including the axis of the rotary shaft 136 is made below 30 deg. from he standpoint vertical to the axis. The steel plate is uniformly rapidly cooled with excellent cooling efficiency without the stagnation of cooling water heated at a high temperature around the rotary shaft of the impeller 132.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impeller of a continuous steel plate quenching apparatus that continuously quenches a steel plate by passing the steel plate into a cooling tank.

In order to increase the cooling rate of the steel plate and perform the quenching process efficiently, it is necessary to increase the relative velocity between the surface of the steel plate and the cooling water. Cooling means 25h that sprays and collides with the steel plate surface
Easy to use.

However, when using this cooling means, the equipment for making the cooling water high pressure becomes large.2. Since the amount of cooling water used is enormous, the quenching equipment is expensive and the operating costs increase. Furthermore, as the water supply piping becomes thicker, the space occupied by the piping increases, which not only necessitates an increase in the height and length of the quenching equipment, but also increases the weight of the piping and its interior, requiring reinforcement of the frame, etc. There is. In addition to this, the pitch of the parallel piping becomes large, making it difficult to increase the injection water flow density FIIL, and the cooling capacity has to be reduced. Another disadvantage is that clogging of the cooling water nozzle causes uneven quenching, which increases the time and cost required to repair the clogging.

On the other hand, the present inventors previously proposed ``a water storage tank through which a steel plate passes to be cooled, and a cooling water tank provided in this water storage tank to move cooling water in the direction of movement of the steel plate or in the opposite direction to the direction of movement of the steel plate. He invented a continuous hardening device for steel plates with an impeller and put it into practical use.

This steel plate continuous quenching equipment is as shown in Figs. 1 to 3.
, the steel plate 12 is held in the water tank 10 from above and below, and the arrow C
A row 216.18 is provided for transporting the row 216.18 in the direction shown in FIG. 64. Cooling water 4 supplied from 66
2 is filled. Furthermore, an impeller 32.34 having a vane plate 40 is provided between the rollers 16.18, and the impeller 32.34 is rotationally driven in the direction of arrows o and E by a drive device 52.54. , this causes the cooling water 4
2 is being stirred. Incidentally, reference numerals 56 and 58 indicate impeller boxes, which are used to efficiently perform stirring.

Here, the impeller 32, 340 vane plates 40 extend from the outer periphery of the impeller rotation axis 36, 38 along an imaginary plane including the axis of the rotation axis in a radial direction and at equal intervals from each other. Therefore, by rotating the impellers 32 and 34 respectively, the cooling water around the impellers is stirred, and in particular the steel plate 120
The cooling water on the surface is moved in the opposite direction to the moving direction of the steel plate 12, for example, and is given a predetermined relative speed to efficiently cool the steel plate. According to the structure of the impellers 32 and 34, the cooling water This flow does not occur at all in the direction perpendicular to the direction of movement of the steel plate 12, that is, in the width direction of the steel plate, and is therefore extremely advantageous in preventing non-uniform hardening in the width direction of the steel plate.

However, according to experiments conducted by the inventors, the impeller 3 with the above structure
2.34, the cooling water around the radial tip of the vane plate 40 is effectively mixed and replaced with newly supplied cooling water; however, when the vane plate 40 (0
In other words, it is difficult for the cooling water around the joint between the vane plate and the rotating shaft 36.
6. It was confirmed that rotation was caused by rotation at 380 degrees.

Furthermore, the supplied cooling water contains air bubbles, and the air bubbles -
If the cooling water that contains air bubbles enters the area around the joint to the outer circumference of the rotating shaft of the blade plate 400, a phenomenon occurs in which the cooling water containing air bubbles stays around the joint area of the blade plate 40, and the air bubbles and the cooling water are discharged to the outside of the water storage tank 10. It becomes difficult to do so. When such a phenomenon occurs, the temperature of the cooling water increases, and the cooling capacity decreases significantly. Ninth, the air bubbles that accumulate around the joints of the vane plates 40 may reduce the efficiency of cooling water usage, increase the impeller's rotational resistance and therefore the power of the rotating part, and even increase corrosion of the impeller. The present invention has been made to solve one of these problems, and its purpose is to improve the speed of the skeleton impeller by the rotation of the impeller within a range that does not cause non-uniform hardening in the width direction of the steel plate. Cooling water is not only moved in the rotational direction, but also moved in the width direction of the steel plate, thereby causing cooling water and air bubbles to stay around the rotational axis of the impeller, that is, on the 4 sides of the connection of the vane plate to the rotational axis. The goal is to prevent this from happening.

To achieve this object, the present invention provides nine blade plates arranged along the longitudinal direction of the rotation shaft of the impeller at approximately equal intervals on the outer periphery of the rotation shaft of the impeller. [Scattered around the outer periphery of the rotating shaft,
This causes a flow of cooling water in the axial direction of the blades.

The present invention will be explained below based on embodiments shown in the drawings.

4wA to 6 show an enlarged view of an embodiment of the impeller according to the present invention. Here, impeller 1320
On the outer periphery of the rotating shaft 136, a plurality of blade plates 140, for example four blades, are arranged along the longitudinal direction of the rotating shaft at approximately equal intervals when viewed in the radial direction of the rotating shaft. The blade plate 140 is attached to the rotating shaft 136 such that the torsional angle a1 is 30 degrees or less when viewed in a direction perpendicular to the axis of the rotating shaft 136 with respect to a virtual plane containing the axis of the rotating shaft 136. It is attached in a spiral shape. Therefore, as particularly shown in FIG. 6, in a cross section perpendicular to the axis of the rotary shaft 136 of the impeller 1320, the center In of the vane plate 140 always intersects with the axis of the rotary wheel 1360. In this way, when using the spiral vane plate 140, there is no effect when the helix angle g is less than 2 degrees (and when the helix angle a exceeds 15 degrees, the cooling water flows in the longitudinal direction of the impeller, that is, the steel plate The movement in the width direction is significant, causing quenching distortion in the width direction of the steel plate.Therefore, this helix angle is 2'J2~15
A range of degrees is preferred.

In addition, as another embodiment, when the twist angle α is 10 degrees or less, the blade plate does not need to have a spirally curved surface, and for example, as shown in FIG. 7, a flat blade plate 240 may be used. may be provided along a virtual plane that intersects a virtual plane including the axis of the rotary ring 136 at an angle of 10 degrees or less when viewed in a direction perpendicular to the axis. In this case, the rotating shaft 13
The cross section perpendicular to the axis of blade 6 is as shown in FIG. 6 at the longitudinal center of the impeller 132, but at other locations, as shown in FIG. However, the blade plate 140 does not intersect with the axis of the rotating shaft 136.
Since the angle at which they intersect is less than 10 degrees, the cooling water will not be disturbed.

In the steel plate continuous quenching apparatus using the impellers 14G and 240 configured in this way, the rotation of the impeller 132 causes the cooling water to move at a predetermined relative speed in the steel plate transfer direction or in the opposite direction to the transfer direction, It exhibits gentle movement in the width direction of the steel plate within a range that does not cause non-uniform hardening. As a result, the rotating wheel 1 of the vane plate 140.240
The cooling water around the joint to the outer periphery of the impeller 36 and the air bubbles mixed in the cooling water do not stay there, but flow out in the axial direction of the impeller and are discharged and circulated to the outside of the water tank.

As explained above, according to the present invention, the cooling water around the rotation axis of the impeller and the air bubbles in the cooling water flow out without causing non-uniform hardening in the width direction of the steel plate, and are combined with newly supplied cooling water. Therefore, it has the excellent effect of being able to prevent harmful effects caused by cooling water and air bubbles remaining around the impeller rotating shaft, such as a decrease in cooling efficiency and an increase in rotational resistance to the impeller.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing a conventional continuous steel plate hardening apparatus equipped with an impeller, Fig. 2 is a cross-sectional view taken along line 1-11 in Fig. 1,
FIG. 3 is a sectional view taken along the line m-m5 in FIG. 1, FIG. 4 is an enlarged top m view showing one embodiment of the impeller of the continuous steel sheet hardening apparatus according to the present invention, and FIG. 5 is a side view of the same. 6 is a sectional view taken along a line perpendicular to the impeller rotation axis in FIG. 4, and FIG. 7 is a sectional view taken at the same position as FIG. 6, showing another embodiment of the present invention. 10... Water tank, 12... Steel plate, 32.34.13
2... Impeller, 36.38.136... Rotating shaft, 4
0°140.240... Vane plate, α... Negative twist. Representative Tatsuyuki Unuma (2 people in line) Figure 3 64 Figure 4 Figure 5 Figure 6 Figure 7

Claims (2)

[Claims] (1) In a continuous steel plate quenching device in which a steel plate is passed through a water storage tank, an impeller is provided in the water tank, and the rotation of the impeller moves cooling water on the surface of the steel plate at a constant relative speed to the steel plate. , the impeller has a plurality of blade plates along the longitudinal direction of the impeller rotation axis at approximately equal intervals around the outer periphery of the impeller rotation axis, and the blade horizontal plate is a virtual plane containing the axis of the impeller rotation axis. An impeller of a continuous steel sheet hardening apparatus, which is sealed to the outer periphery of the impeller rotating shaft along a virtual plane that intersects at an angle of 30 degrees or less when viewed in a direction perpendicular to the wrinkle axis. (2) The blade plate is arranged in a spiral shape having a helix angle of 2 degrees to 15 degrees when viewed in a direction perpendicular to the mosquito axis with respect to a virtual plane including the axis of the impeller rotation axis. 9. An impeller of a continuous steel sheet hardening apparatus according to claim 1, which is attached to the outer periphery of the impeller. is>#Distribution horizontal plate 11 A patent claim that lies along a virtual plane that intersects the axis of the impeller rotating shaft at an angle of 10 degrees or less when viewed in a direction perpendicular to the axis. The impeller of the steel plate continuous quenching apparatus according to item 1.