SU584042A2 - Device for heat treatment and hydraulic conveying rolled articles - Google Patents

Description

one

This invention relates to heat treatment of rolled products.

The known devices for heat treatment of long products from rolling heating are mostly of the same type and provide for simultaneous hydrotransportation of products in the process of accelerated cooling.

According to the main author. St. N ° 416400, a device for heat treatment and hydrotransport of rolled products is known, comprising a receiving funnel, a housing and a cooling chamber, the output end of the receiving funnel is shaped like a cooled profile and placed inside the cooling chamber, forming at least one nozzle with it, the axis of which is parallel to the direction rolling, and the cooling chamber is provided with a discharge hole located in the zone of maximum static pressure at a distance equal to 30-60 internal diameters of the chamber from the nozzle.

This embodiment of the cooling chamber provides a reduction in the braking of the front end of the rolled product entering the chamber due to the displacement of the zone of maximum pressure by a distance of 30-60 diameters of the chamber from the nozzle. Then, due to the decrease in static pressure in this area of the chamber and the presence of the hydrotransmitting capacity of the cooling flow, unimpeded movement of the rolled metal through the cooled: giving device is created.

The operation of the described device shows that the presence of a hole in the cooling chamber1; at a specified distance from the nozzle it does not always ensure the normal operation of the device. A single cross-section hole has almost no significant effect on the reduction of rolled braking at the entrance to the cooling chamber; a hole of another section, reducing the drag of the front end due to eliminated excessive static pressure in this area of the chamber,

causes loss of hydrotransport ability of the device.

The aim of the invention is to increase the hydrotransport ability of the device and reduce the inhibition of the front

the end of irocate by the cooling medium in the zone of maximum static pressure of the cooling chamber. This is achieved by the fact that the drop hole is made over an area of 0.4 to 1.0 square of the transverse

section of the cooling chamber.

Pa drawing is shown in the context of the proposed device with a discharge hole, applied to the cooling of the valve. The device has a receiving funnel 1, a corn 2 and a cooling chamber 3. The output end of the receiving funnel is made in the form of cooled steel 4 and is placed inside the cooling chamber, forming with it at least one nozzle 5, the axis of which is parallel to the direction of movement of the rolled metal. The cooling chamber is provided with an opening 6 for relieving excessive static pressure and is located at a distance of 30-60 viutrei diameters from the nozzle. The drop area is 1; its openings are 0.4-1.0 of the cross-sectional area of the cooling chamber.

The device works as follows.

The front end of the rental 4 through the receiving funnel 1 enters the portion of the cooling chamber 3 located between the nozzle 5 and the discharge port 6. Due to the absence of static pressure and the presence of a hydrotransforming flow force of the coolant in this portion of the chamber, free rolling through the device is provided.

Studies of the dependence of the thrust force of a device with a cooling chamber having an ionoretic cross section of 3600 mm, with a water pressure of 20 atm from the cross section of a discharge hole for reinforcement bars with diameters of 18 and 28 mm show (see table) that optimal conditions for hydrotransport of the front end through the cooling chamber the maximum ha and the absence of excessive static pressure in the cooling chamber section, equal to 30-60 of its internal diameters) are provided with an opening area of 0.4-1.0 cross section area and ohlazhdeii camera. When a hole is made with a thinning of 0.4 times the cross-sectional area of the cooling chamber, the transporting forces of the device are simultaneously reduced by 10% (or more) and the excess static pressure in the chamber increases. Reset hole with area

more than 1.0 of the cross-sectional area of the cooling chamber makes it possible to completely eliminate the excess static pressure in the cooling chamber section equal to 30-60 of its internal diameters, but causes a significant (more than 30%) decrease in the hydrotransforming force of the device.

Thus, the described device allows to completely eliminate the excess static pressure in the cooling chamber section, equal to 30-60 of its internal diameters, and to ensure the maximum hydrotransport ability of the device.

Claims (1)

Invention Formula A device for heat treatment and hydrotransporting of rolled products according to ed. St. NO 416400, characterized by that, in order to increase the hydrotraptive method and reduce braking at the front end of the car, the hole is made over an area equal to 0.4-1.0 of the area of the cross section of the cooling chamber.