JPS6319315Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a water return prevention device provided at a charging port of a steel plate quenching apparatus.

[Prior art]

Currently, steel mills are equipped with heat treatment furnaces and steel sheet hardening equipment to continuously harden steel sheets. In such a steel sheet hardening apparatus, cooling water is injected from a spray nozzle onto a steel sheet that is continuously transferred on a conveyor roller to harden the steel sheet. Therefore, when the steel plate passes through the spray nozzle, the jetted cooling water collides with the rear end surface of the steel plate and bounces back. If this rebound water is left unattended, it may flow into the heat treatment furnace and impair the function of the heat treatment furnace, or it may come into contact with subsequent steel plates and cause uneven heating.

As a conventional device for preventing this water from returning, there is a device shown in FIG.

In the figure, 1 is a heat treatment furnace, 2 is a steel sheet hardening device, and 3 is a conveyor roller, and a water return prevention device 5 is provided at the entrance of the steel sheet hardening device 4.

Pulley 8 driven via motor 6 and reducer 7
A waterproof plate 9 is suspended from the steel plate 2, and after the steel plate 2 passes, the waterproof plate 9 is lowered to prevent water from returning.

Such a conventional water return prevention device 5 includes the aforementioned driving device, a steel plate rear end detector 10 for detecting the position of the steel plate 2, a steel plate tracking device 11, a limit switch 12 for detecting the upper and lower limits of the waterproof plate 9, 13,
14. Furthermore, a control device is required to operate the drive device based on the signals from these detectors, making the device complicated and expensive. Furthermore, the atmosphere in which the various detectors described above are provided is poor, making it troublesome to protect the detectors, and having low reliability and frequent malfunctions. Furthermore, if the steel plate conveyance interval is narrow, it may not be possible to use it due to responsiveness problems.

[Purpose of invention]

In view of the above circumstances, it is an object of the present invention to provide a water return prevention device that has a simple structure and reliably prevents water from returning under any conditions.

[Structure of the idea]

In this invention, a waterproof curtain consisting of bendable members that are suspended and connected to cut off the steel plate passage is installed at the charging port of the steel plate hardening equipment, allowing the passage of steel plates freely while preventing water from returning. This eliminates the need for a drive device, control device, etc.

〔Example〕

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

FIG. 2 shows the first embodiment, in which the same parts as in FIG. 1 are given the same reference numerals.

15 is a pinch roller for transferring the steel plate 2;
6 is a first nozzle of the steel plate hardening device 4;
The nozzle 16 tilts the jetting direction of the cooling water 17 toward the downstream side so as to prevent uneven cooling caused by the cooling water that collides with the steel plate surface bouncing back to the upstream side.
For this reason, the water return phenomenon 18 will occur even more.

An auxiliary frame 20 is attached to the charging port side end of the top frame 19 of the steel plate hardening apparatus 4, and a waterproof curtain 21 is hung from the auxiliary frame 20. As shown in FIG. 3, the waterproof curtain 21 is made up of a band-shaped body 23 formed by connecting flat plate members 22 of a required width so as to be flexible with pins, which are connected in a planar manner across a steel plate passage. . Two sets of the above-mentioned waterproof curtains are vertically installed along the steel plate traveling direction A, and the upstream curtain 21 and the downstream curtain 21 are arranged so as to mutually close the gap between the strips 23. The vertical position of the strip 23 is shifted between the two.

In the water return prevention device 5, when the steel plate 2 passes, the portion of the curtain 21 that contacts the steel plate 2 bends to allow the steel plate to pass, as shown in FIG.
After the rear end passes, it hangs down again to its original state. 1st
When the cooling water 17 from the nozzle 16 collides with the rear end surface of the steel plate 2, return water 18 is generated. Most of the return water 18 collides with the curtain 21 on the downstream side and falls, and the return water that has passed through the gap between the strips 23 of the curtain is also blocked by the curtain 21 on the upstream side and falls. Water does not flow into the heat treatment furnace 1.

According to this device, there is no need for the water return prevention device to move up and down in response to the movement of the steel plates, and there is no effect on the function even if the distance between the steel plates becomes narrow.

FIG. 4 shows another embodiment of the present invention, in which one set of curtains 21 is used, and the structure of the curtains 21 is changed. That is, in this embodiment, chain 2
4 hanging tightly.

Furthermore, the chain 24 may be replaced by a heat-resistant wire material hanging tightly.

[Effect of idea]

As described above, according to the present invention, the following excellent effects can be exhibited.

(i) The structure is extremely simple and manufacturing costs can be significantly reduced.

(ii) High reliability with no worries about breakdowns or malfunctions.

(iii) There is no need for maintenance and running costs are low.

(iv) Even if the distance between the steel plates becomes narrow, the effect can be sufficiently exerted.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional water return prevention device, Fig. 2 is an explanatory diagram of an embodiment of the present invention, Fig. 3 is a view taken in the direction of arrow B in Fig. 2, and Fig. 4 is an explanatory diagram of an embodiment of the present invention. It is an explanatory view of an example of. 4 is a steel plate hardening device, 21 is a waterproof curtain, 23
24 represents a strip, and 24 represents a chain.

Claims (1)

[Scope of utility model registration request] 1. A water return prevention device for a steel sheet hardening device, characterized in that a waterproof curtain is provided at a charging port of the steel sheet hardening device, and the waterproof curtain is constructed by hanging a bendable member that interrupts a steel sheet path.