JPS6219486B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impeller for 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 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 this cooling method is used, the equipment for pressurizing the cooling water becomes large and the amount of cooling water used becomes enormous, resulting in expensive quenching equipment and increased operating costs. . 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 internal parts, 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.
Cooling capacity will have to be reduced. Further, clogging of the cooling water nozzle causes uneven quenching, which has the drawback of increasing 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.

The present invention relates to improvements in such steel plate hardening equipment,
In particular, it is concerned with improving the shape of the impeller.

As shown in FIGS. 1 to 3, the steel plate continuous quenching apparatus includes rollers 1 for holding a steel plate 12 from above and below in a water storage tank 10 and transporting it in the direction of arrow C.
6, 18, and the rollers 16, 18
are configured to be rotated in the directions of arrows A and B by drive devices 28 and 30, and cooling water 42 supplied from main water supply pipes 64 and 66 is provided in the water storage tank 10.
is filled with. Further, the rollers 16,1
Between 8 and 8 are impellers 32 and 3 having blade plates 40.
4 is provided, and the impellers 32, 34 are driven by a drive device 5.
2 and 54 to rotate in the directions of arrows D and E, thereby stirring the cooling water 42. Note that reference numerals 56 and 58 are impeller boxes for efficiently stirring.

However, the impeller 3 of the steel plate continuous quenching apparatus
2 and 34, during rotation during quenching, the distance between the front and back surfaces of the steel plate 12 to be quenched and the end of the blade plate 40 is several tens of mm or less, so the steel plate 1 is rotated during quenching.
2, a part of the steel plate 12 comes into contact with the vane plate 40, causing damage to the impellers 32 and 34,
Furthermore, if the strain in the steel plate 12 is large, there is a possibility that the steel plate 12 will not be able to pass between the impellers 32 and 34. Further, when the front and back surfaces of the steel plate 12 come into contact with the vane plate 40, the front and back surfaces of the steel plate 12 are damaged, causing a significant deterioration in product quality.

In view of the problems of the conventional quenching device, the present invention includes a plurality of rings having an outer diameter larger than the outer diameter formed by the tip of the blade plate when the impeller rotates, on the rotating shaft of the impeller installed in the water storage tank. It is attached to the rotating shaft of the impeller and is intended to prevent damage to the front and back surfaces of the steel plate and damage to the impeller due to direct contact between the steel plate and the impeller when the steel plate is distorted during hardening work. be.

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

FIG. 4 is a sectional view showing an embodiment of the impeller of the continuous steel sheet hardening apparatus according to the present invention, and FIG. 5 is a partially enlarged sectional view of the same impeller. As shown, water tank 1
The impellers 32 and 34 provided in the rotating shaft 3
6, 38 are pivotally supported by the shaft support devices 44, 46 provided on the side surfaces of the impeller boxes 56, 58, and at the shaft ends passing through the shaft support devices 44, 46 at one end of the impellers 32, 34, It is rotatably driven by drive devices 52 and 54 connected via joints 48 and 50, and is configured to effectively stir the cooling water in the water tank and perform a predetermined hardening operation.

These impellers 32, 34 have four blade plates 40 that protrude from the outer periphery of the rotating shafts 36, 38 at equal intervals in the radial direction, as shown in FIG. Distance from the surface of the steel plate 12 δ ₁
is considered to be several tens of mm or less, and the cooling water impeller 32,3
4, that is, in the width direction of the steel plate 12 that is conveyed while being held between the upper and lower rolls 16 and 18, is configured to eliminate uneven quenching. Further, these impellers 32 and 34 have the same axis as the impeller axis, and have an outer diameter larger than the outer diameter d ₁ formed by the tip of the blade plate 40 when the blade plate 40 rotates. d ₂ , and each ring has the same outer diameter 1
00 are attached on the outer periphery of the rotating shafts 36, 38 at a predetermined interval in the axial direction of the rotating shafts 36, 38. The diameter of the ring 100 from the impeller axis to the outer peripheral end is larger than the diameter from the impeller axis to the tip of the blade plate 40, and is formed to such an extent that it does not interfere with the steel plate 12. Therefore, the distance δ ₂ between the ring 100 and the surface of the steel plate 12 is smaller than the distance δ ₁ between the vane plate 40 and the surface of the steel plate 12, and is several tens of mm or less.

Note that the spacing between the rings 100 is 200 mm ~
Although it is set to 1000 mm degrees, it is not limited to this, and may be determined as appropriate in consideration of ring strength, etc.

As is clear from the above explanation, in the steel plate continuous quenching apparatus equipped with the impeller according to the present invention, when the steel plate is distorted during the quenching operation, the front and back surfaces of the steel plate are
Since it comes into contact with the outer periphery of the rotating ring and does not come into contact with the vane plate, there is no damage to the vane plate as in the conventional case, and there is no damage to the front and back surfaces of the steel plate due to contact with the vane plate. This is also something that can be reliably prevented.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional steel plate continuous hardening apparatus equipped with an impeller, Figure 2 is a sectional view taken along the - line in Figure 1, Figure 3 is a sectional view taken along the - line in Figure 1, and Figure 4 is a sectional view taken along the - line in Figure 1. FIG. 5 is a cross-sectional view showing one embodiment of an impeller of a continuous steel sheet hardening apparatus according to the invention, and FIG. 5 is a partially enlarged cross-sectional view of the same impeller. 10... Water tank, 12... Steel plate, 32, 34... Impeller, 36, 38... Rotating shaft, 40... Vane plate, 100
…ring.

Claims (1)

[Claims] 1 A water storage tank through which a steel plate passes to be cooled;
In a continuous steel plate quenching apparatus having an impeller which is provided in the water storage tank and moves the 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, a blade plate is attached to the rotation axis of the impeller when the impeller rotates. An impeller for a continuous steel sheet hardening apparatus, characterized in that a plurality of rings are attached, each having an outer diameter larger than the maximum outer diameter formed by the tip and having the same axis.