JPS6219484B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous steel plate hardening apparatus that continuously hardens 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 quenching work efficiently, it is necessary to increase the relative speed between the surface of the steel plate and the cooling water. For this reason, conventionally, a cooling means has been employed in which pressurized cooling water is injected from a nozzle and collides with the surface of the steel plate.

However, when using this cooling means, the equipment for pressurizing the cooling water becomes large and the amount of cooling water used becomes enormous, resulting in the disadvantage that 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 contents, which requires reinforcement of the frame, etc. There is a need.

In addition to this, the pitch of the parallel piping becomes large, making it difficult to increase the jet water flow density, and the cooling capacity must be reduced. In addition, clogging of the cooling water nozzle causes uneven quenching.
This has the disadvantage that the time and cost required for repairing clogging increases.

In order to solve these problems, the present inventors have already invented and filed an application for a "steel plate continuous quenching apparatus." (Japanese Patent Application No. 55-167102, hereinafter referred to as the "prior application") Below, an overview of this prior application will be explained with reference to the drawings.

Figures 1 to 4 are configuration diagrams of the earlier application, and
Figure 1 is a side sectional view, Figures 2 and 3 are sectional views taken along the - line and - line in Figure 1, respectively.
The figure is an enlarged view of the main part of Figure 1.

In FIG. 1, reference numeral 10 denotes a water storage tank, and a slit-shaped opening 11 through which a steel plate 12 to be cooled is inserted is provided in the opposite wall thereof. Also, there is a steel plate 12 inside.
A flat roll (i.e., a roll whose cross-sectional shape perpendicular to the axis is the same over the entire length) 16, 1 for holding the material from above and below and conveying it in the direction of arrow C.
8 is provided. This flat roll 16,
18 is rotationally driven in the directions of arrows A and B by drive devices 28 and 30 (see FIG. 2). Also water tank 1
0 is filled with cooling water 42 supplied from main water supply pipes 64 and 66. Furthermore, impellers 32 and 34 having blade plates 40 are provided between the flat rolls 16 and 18 so that their axes are parallel to the rolls 16 and 18, and driven by drive devices 52 and 54 (see FIG. 3). It is configured to be rotated in the directions of arrows D and E to agitate the cooling water 42.
Reference numerals 56 and 58 are impeller cover boxes for efficient stirring. These impeller cover plates 56, 58
The part facing the steel plate is an open part.

As shown in FIG. 1, the float rolls 16 and 18 are arranged in pairs at appropriate intervals, and as shown in FIG. has been done. The axes of these rolls 16 and 18 are horizontal, and are arranged in the lateral direction of the water tank 10, respectively. Furthermore, each roll 16, 18
One end passes through the bearing devices 20 and 22 and connects to the water storage tank 1.
0, and is connected to prime movers 28 and 30 via joints 24 and 26 to be rotationally driven. This rotation direction is the upper roll 16 and the lower roll 1.
8 are in opposite directions (directions of arrows A and B in Figure 1)
A steel plate 12 is sandwiched between both rolls and conveyed in the longitudinal direction of the water tank 10.

In addition, outside the water storage tank 10 in FIG.
They are placed above and below 2. These water supply pipes 74
A slit nozzle 76 is connected to the slit nozzle 76, and pressure water 78 from the slit nozzle 76 is jetted toward the opening 11 to seal the opening 11 with water.

In the device configured in this way, the impeller 3
2, the flow of cooling water on the surface of the steel plate occurs only below the impeller 32, as shown in FIG. From becoming, roll 1
6, the steel plate 12 is hardly cooled.
That is, since these rolls 16 and 18 are flat rolls, the steel plate 12 and the rolls 16 and 18 are in a continuous line contact state in the roll longitudinal direction, and the cooling water storage tank 10 generated by the rotation of the impellers 32 and 34 is released in the longitudinal direction. The flow in this direction is blocked by the rolls 16 and 18, and a flow is generated that moves away from the surface of the steel plate 12 to be cooled, as indicated by arrow J in the figure. For this reason, the flow of cooling water becomes weak around the contact between the rolls 16 and 18 and the steel plate 12, which may reduce the efficiency of the hardening operation.

The present invention has been made in view of the above facts, and an object of the present invention is to provide a continuous steel sheet hardening apparatus in which the flow rate of cooling water near the surface of the steel sheet to be cooled is increased, thereby further improving the efficiency of hardening work. It is something.

Accordingly, the present invention provides a water storage tank having a slit-like opening in an opposite wall for inserting a steel plate to be cooled, a day scroll disposed in the water tank for holding and feeding the steel plate to be cooled, and the water storage tank. an impeller disposed near a surface through which the steel plate to be cooled is disposed so that its axis is substantially parallel to the axis of the day scroll, and an impeller surrounding the impeller and having an open portion facing the steel plate to be cooled. a vehicle cover box and a first drive device for rotating the impeller;
a second drive device for rotating the day scroll;
This objective is achieved by a continuous steel sheet hardening apparatus comprising:

Examples will be described below with reference to the drawings.

FIG. 5 is a side sectional view of a continuous steel sheet hardening apparatus according to an embodiment of the present invention, FIG. 6 is a sectional view taken along the line shown in FIG. 5, and FIG. Figure 8 is a horizontal sectional view.

The device shown in FIGS. 5 to 8 differs from the device according to the prior application shown in FIGS. 1 to 4 in that day scrolls 16' and 18' are used instead of flat rolls 16 and 18. It is in. As shown in detail in FIG. 6, this day scroll 16',
18' has a plurality of rings 16'', 18'' having the same axis as the roll rotation axis, and during hardening work, the steel plate 1 is held and conveyed by these rings 16'', 18''. Therefore, a gap h is created between the roll rotation shaft and the steel plate 12 by the height of the rings 16'' and 18''. Therefore, as shown in FIG. 7, the water flow H caused by the rotation of the impeller 32 moves through this gap h in the longitudinal direction of the water tank 10 (arrow H'), and the flow of cooling water along the steel plate surface increases. is greatly increased, and cooling efficiency is significantly improved.

FIG. 8 is a horizontal sectional view of this embodiment, showing the arrangement of the day scrolls 16', 18'.
As shown in FIG. 8, the day scroll 16',
Rings 16″ and 18″ attached to the rotating shaft of 18′
are in different positions. Therefore, in this embodiment, when the steel plate is moved in the longitudinal direction of the water tank, the rings 16'' of each roll 16', 18',
The contact position between 18'' and the steel plate 12 changes automatically, resulting in particularly excellent hardening uniformity.

As explained above, since the continuous steel plate hardening apparatus according to the present invention moves cooling water in the conveying direction of the steel plate or in the opposite direction, the conventionally used cooling nozzle is unnecessary and accidents caused by nozzle clogging can be eliminated. This eliminates the need to simultaneously cool the entire length of the steel plate, enabling efficient cooling and downsizing the quenching equipment.

Furthermore, the cooling water moved by the rotation of the impellers 32 and 34 moves as a strong water flow along the surface of the steel plate 12 around the upper and lower day scrolls as well as around the impellers 32 and 34. , the effective cooling area is increased, and the cooling water usage efficiency and cooling capacity can be significantly improved. Furthermore, the amount of cooling water used can be reduced, and the quenched steel sheet can be manufactured at a lower cost.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the device of the prior application, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is a sectional view taken along the line of Fig. 1, and Fig. 4 is an enlarged view of the main parts of Fig. 1. be. 5 is a side sectional view of an embodiment of the device of the present invention, FIG. 6 is a sectional view taken along the line of FIG. 5, FIG. 7 is an enlarged view of the main part of FIG. 5, and FIG. FIG. 3 is a horizontal sectional view of the device. 10... Water tank, 12... Steel plate to be cooled, 16, 18
... Flat roll, 16', 18'... Day scroll, 32, 34... Impeller, 42... Cooling water.

Claims (1)

[Scope of Claims] 1. A water storage tank having a slit-shaped opening on an opposite wall for inserting a steel plate to be cooled, a day scroll disposed in the water tank for holding and feeding the steel plate to be cooled, and the water storage tank. an impeller disposed near a surface through which the steel plate to be cooled is disposed so that its axis is substantially parallel to the axis of the day scroll, and an impeller surrounding the impeller and having an open portion facing the steel plate to be cooled. A steel plate continuous hardening apparatus comprising: a car cover box; a first drive device for rotating the impeller; and a second drive device for rotating the day scroll. 2. Claim 1, characterized in that a water supply pipe is connected to the back of the impeller cover box.
Continuous quenching equipment for steel plates as described in 2.