CN1208154C - Device for producing cast iron pipe by horizontal continuous casting method - Google Patents

Abstract

The invention relates to a device for producing cast iron pipes by a horizontal continuous casting method. The horizontal continuous casting device includes a tractor, a heat preservation liquid storage container, and stores molten iron in the heat preservation liquid storage container. There is a crystallizer connected with the heat preservation liquid storage container, and a diversion pipe connected with the heat preservation liquid storage container The separator is connected with the diversion separator by a mandrel, and the outer side of the mandrel is provided with an annular sleeve mold, and the outer side of the annular sleeve mold is provided with a spiral water-cooling jacket. The crystallizer is connected on the outer wall of the heat preservation liquid storage container. The water inlet and outlet nozzles at both ends of the water cooling jacket are connected with circulating cooling water. There are multiple sets of water-air mixing spray coolers installed at the outlet end of the crystallizer. The device of the invention occupies less land, has small investment, low cost and high production efficiency. It ensures that the wall thickness of the drawn cast iron pipe is uniform, and the pipe drawing efficiency is increased by more than 50%. The problem of spheroidization decline and inoculation decline of molten iron caused by low pulling speed in the prior art is completely solved, and the yield of finished products is improved.

Description

Device for producing cast iron pipe by horizontal continuous casting method

technical field

The invention relates to equipment for producing cast iron pipes by continuous casting, in particular to a device for producing cast iron pipes by horizontal continuous casting.

Background technique

At present, cast iron pipes are produced in my country's foundry industry, and their weight has accounted for 1/5-1/6 of the total casting weight. The production process of cast iron pipes is mainly continuous and semi-continuous casting. There are nearly 200 cast pipe manufacturers in the country, and more than 90% of them use the continuous casting process. Its equipment and methods were introduced from the former Soviet Union in the 1950s and 1960s, mainly vertical or vertical continuous casting pipes. The use of this equipment and process has many disadvantages, and the water pressure resistance of the produced pipes is generally ≤1.0Mpa. Therefore, industrially developed countries have gradually eliminated this equipment and process. At present, all countries in the world adopt centrifugal casting pipe production equipment and process methods. The cast iron pipe produced by this equipment and process has a dense structure, and its strength and toughness are better than vertical continuous casting pipes. Our country already has an annual production capacity of hundreds of thousands of tons, but this method has the disadvantages of large one-time investment, high production cost, and complicated process. It is still difficult in terms of capital to produce cast pipes with the above-mentioned centrifugal casting pipe technology in my country. .

According to the literature retrieval of the content of the present invention according to the Information Research Institute of Shaanxi Province, 16 relevant documents have been found, and there is no relevant patent document report with the device provided by the present invention.

Contents of the invention

The object of the present invention is to provide a device for producing cast iron pipes by horizontal continuous casting with high production efficiency, low cost and good quality by utilizing and reforming the existing horizontal continuous casting equipment for producing solid cast iron profiles.

The technical scheme that realizes the object of the present invention is solved like this:

It includes a tractor and an insulated liquid storage container. The molten iron is stored in the insulated liquid storage container. There is a crystallizer connected with the insulated liquid storage container. The separator is connected with the diversion separator with a mandrel, an annular sleeve mold is provided outside the mandrel, a spiral water cooling jacket is provided outside the annular sleeve mold, and it is connected to the outer wall of the heat preservation liquid storage container, There are several sets of water-air mixing spray coolers installed at the outlet of the crystallizer, and the mandrel is in a cone-shaped structure, and its length is longer than that of the annular sleeve mould.

The taper α angle of the mandrel is controlled at 0° to 2.5°, and the length is greater than the length of the annular sleeve mold and less than or equal to 1.2 times the length of the annular sleeve mold.

Processing method of the present invention carries out according to the following steps:

A: The horizontal continuous casting equipment used to produce solid cast iron pipe profiles is equipped with the device of the present invention;

B: Design an insulated liquid storage container according to the production capacity, so that the molten iron has a larger pressure head, so that the impurities in the molten iron can be fully floated to ensure the purity of the molten iron;

C. Increase the volume and pressure head of the container to fully feed the molten iron, thereby improving the mechanical properties of the product;

D. When the molten iron enters the ring-shaped mold cavity of the crystallizer, it is forced to cool with cooling water, and the molten iron crystallizes and solidifies to form a cast iron pipe, which is pulled out by a tractor. When the cast iron pipe is pulled out of the mold step by step, it is sprayed with water and air for cooling The cast iron pipe is cooled by secondary spraying, and the cast iron pipe continues to cool. The drawn cast iron pipe is guided by the guide wheel to the cutting machine, and then cut according to the size required by the user.

Compared with the prior art, the present invention has the following advantages:

1. Since the process of horizontal continuous casting is characterized by large pressure head and sufficient shrinkage, the impurities in the molten iron in the heat preservation liquid storage container can be fully floated up, and the molten iron flowing into the crystallizer has no impurities, so the mechanical The main technical quality indicators such as performance, compactness and oil pressure resistance and air tightness are better than centrifugal cast iron pipes, and can greatly exceed the technical indicators of ordinary continuous cast iron pipes.

2. Adopting the device and process of the present invention has less land occupation, less investment, lower cost and higher production efficiency.

3. The water-air mixing spray cooler installed at the outlet of the crystallizer can fully mix and atomize the air and water to form a secondary spray cooling area, thereby ensuring that the wall thickness of the drawn cast iron pipe is uniform, and the pipe drawing efficiency is increased by 50%. above.

4. Since the casting speed of the cast pipe is improved by the present invention, the problem of spheroidization and inoculation recession of molten iron caused by low casting speed in the prior art is completely solved, and the yield of the product is improved.

5. Adopting the present invention is suitable for producing various high oil-resistant and high-pressure ductile iron pipes or ordinary cast iron pipes of different specifications and sizes, and can prevent leakage accidents.

6. The present invention can transform the production line of the horizontal continuous casting machine for solid profiles at the prior art level into a pipe production line. Therefore, the invention has better economic and social benefits, and can organize export to earn foreign exchange.

Description of drawings

Fig. 1 is the schematic sectional view of device of the present invention

Detailed ways

Accompanying drawing is a specific embodiment of the present invention

Below in conjunction with accompanying drawing, content of the present invention will be further described

Referring to the accompanying drawings, the device for producing cast iron pipes by the horizontal continuous casting method includes a tractor and an insulated liquid storage container 2, in which molten iron 1 is stored, and the insulated liquid storage container 2 is connected with A crystallizer is characterized in that said crystallizer also includes a diversion partition 3 connected to the heat preservation liquid storage container 2, a mandrel 5 connected with the diversion diaphragm 3, and a mold 5 is arranged on the outside of the mandrel 5 There is an annular sleeve mold 7, and a spiral water cooling jacket 4 is arranged on the outside of the annular sleeve mold 7, and is connected to the outer wall of the heat preservation liquid storage container 2, and the two ends of the water cooling jacket 4 are connected with inlet and outlet water nozzles 6, and in the crystallizer Multiple groups of water-air mixing spray coolers 8 are installed at the outlet end of the outlet. The mandrel is a conical structure, its taper α angle is controlled at 1° or 1.5°, and the length is 0.25m or 0.5m.

The technology of producing cast iron pipe by horizontal continuous casting method is carried out according to the following steps:

A, adopt the horizontal continuous casting equipment of producing solid cast iron profile to be equipped with device of the present invention;

B. Design an insulated liquid storage container 2 according to the daily production capacity, so that the molten iron 1 has a larger pressure head, so that the impurities in the molten iron 1 can fully float up and ensure the purity of the molten iron 1;

C. Increase the volume and pressure head to fully feed the molten iron 1, thereby improving the mechanical properties of the product.

D. When the molten iron 1 enters the annular mold cavity, it is forcibly cooled with cooling water. The molten iron 1 crystallizes and solidifies to form a cast iron pipe, which is pulled by a tractor. After the cast iron pipe is pulled out of the crystallizer step by step, the water-air spray cooler 8 is used for two times Spray cooling, the cast iron pipe continues to cool, and the drawn cast iron pipe 10 is delivered to the cutting machine by the guide wheel. Cut according to the size required by the user.

Claims (2)

1, a kind of horizontal continuous casting method is produced the device of cast iron pipe, comprise a hauling machine and an insulation liquid storage container (2), in insulation liquid storage container (2), store molten iron (1), with insulation liquid storage container (2) is connected a crystallizer arranged, it is characterized in that, said crystallizer also comprises a diaphragm (3) that links to each other with insulation liquid storage container (2), what be connected with diaphragm (3) has a core (5), be provided with annular cover die (7) in the outside of core (5), be provided with screw type water collar (4) in the outside of annular cover die (7), and be connected on the outer wall of insulation liquid storage container (2), the port of export at crystallizer is equipped with many group gas-vapor mix spray coolers (8), described core (5) is a pyramidal structure, and its length is greater than the length of annular cover die (7).

2, horizontal continuous casting method according to claim 1 is produced the device of cast iron pipe, it is characterized in that, described core (5), its tapering α angle is controlled at 0 °～2.5 °, length greater than the length of annular cover die (7) smaller or equal to 1.2 times of annular cover die (7) length.

Images