CN104827004A - Inner core rod assembly used for continuous casting of large-diameter copper tube - Google Patents

Abstract

An inner mandrel assembly for large-diameter copper pipe continuous casting, including an inner mandrel, a fixed plate and a condenser, the fixed plate is sleeved on the copper liquid gate at the bottom of the smelting furnace, and the inner mandrel is sleeved by the mandrel on the connection method It is composed of the through hole of the flange, and is fixed between the fixed plate and the condenser by the connecting flange. The upper end of the mandrel passes through the connecting flange and the through hole in the center of the fixed plate in turn to connect with the copper liquid gate at the bottom of the melting furnace. Extending into the condenser and forming a tubular cavity between the inner wall of the condenser, an ingate connected to the copper liquid gate is provided on the mandrel, and an ingate perpendicular to the ingate is provided on the side wall of the ingate , the ingate is opened above the tubular cavity, and a pulling device for pulling the copper tube in the tubular cavity of the condenser is provided below the condenser. The invention cooperates with the large-diameter copper pipe continuous casting equipment through the improvement of the structure of the inner mandrel assembly, reduces the production cost of the large-diameter copper pipe, and improves the rate of finished products.

Description

An inner mandrel assembly for continuous casting of large-diameter copper pipes

technical field

The invention belongs to equipment in the field of metallurgy, in particular to an inner mandrel assembly for continuous casting of large-diameter copper pipes.

Background technique

Copper pipe is used as a profile for pressure processing, and its manufacturing process must go through processes such as smelting, casting, and pressure processing to form a product. However, copper is prone to defects such as looseness, pores, and cracks during casting, and the scrap rate is high. At present, the domestic Copper tubes are produced by pressing copper ingots, especially the pressure processing of large-diameter copper tubes requires large-tonnage extrusion equipment, which requires large investment and high cost. Someone proposed a large-diameter copper pipe continuous casting process, but there was no description of the structure and fixing method of the inner mandrel in the equipment used, which made the process impossible to implement and difficult to promote.

Contents of the invention

The purpose of the present invention is to provide an inner mandrel assembly for continuous casting of large-diameter copper pipes, improve its structure, and make it match with the equipment of large-diameter copper pipe continuous casting process, reduce the production cost of large-diameter copper pipes, and improve the quality of finished products. Rate.

In order to solve the above technical problems, the technical solution adopted in the present invention is: an inner mandrel assembly for continuous casting of large-diameter copper pipes, which is arranged at the bottom of the melting furnace, and the center of the bottom of the melting furnace is opened and protrudes downward to form a The molten copper gate for molten copper is characterized in that the assembly includes a fixed plate fixed at the bottom of the smelting furnace, an inner mandrel and a condenser, the center of the fixed plate is provided with a through hole and is sleeved on the molten copper pouring On the mouth, the inner mandrel is composed of a mandrel set in a through hole in the center of a connecting flange, and the inner mandrel is fixedly connected between the fixed plate and the condenser through the connecting flange, and the upper end of the mandrel Pass through the connecting flange and the through hole in the center of the fixing plate in turn, and then connect with the molten copper gate of the melting furnace. Cavity, the center of one end of the mandrel connected to the molten copper gate is provided with an ingate through which the copper liquid flows along the length of the mandrel, and a plurality of ingates perpendicular to the ingate are arranged on the side wall of the lower end of the ingate , the inner gate opens at the upper end of the tubular cavity of the condenser, and the molten copper melted by the melting furnace flows into the inner runner of the inner mandrel from the molten copper gate of the melting furnace, and flows into the tubular cavity of the condenser from the inner gate , forming a copper tube.

Further, a pulling device is provided at the lower end of the condenser, and the pulling device is connected with the copper tube formed in the condenser, so as to pull the copper tube out of the condenser and pull it into a copper tube of a certain length.

Further, a ring groove is arranged around the mandrel on the lower surface of the connecting flange, and an elastic sealing ring is arranged in the ring groove, and the height of the elastic sealing ring is greater than the depth of the ring groove, and the upper and lower surfaces of the fixing plate are respectively provided with There is a high temperature seal surrounding the center through hole of the mounting plate.

Further, the mandrel can be set to different diameters so that the tubular cavities formed between it and the inner wall of the condenser have different thicknesses, and then be replaced as needed to change the wall thickness of the formed copper tubes and The diameter of the copper pipe.

Compared with the prior art, the present invention has the following beneficial effects:

First, the present invention makes the assembly and disassembly of the assembly easier by optimizing the structure of the inner mandrel assembly, and can meet the continuous casting of copper pipes of different diameters, with reliable performance;

Second, the present invention cooperates with the ingate through the inrunner, so that the copper liquid flowing out from the smelting furnace can evenly flow into the tubular cavity in the condenser;

Third, since the outer wall of the condenser is a steel structure, and the connecting flange of the inner mandrel is also a steel structure, after the two are fixedly connected, they cannot play a sealing role, and the copper liquid flowing out through the inner runner and the inner gate may flow from The gap between the two overflows. Therefore, the lower surface of the connecting flange of the inner mandrel in the present invention is provided with a ring groove with a built-in elastic sealing ring, which can squeeze the elastic sealing ring when the connecting flange is fixed on the condenser, so that The elastic sealing ring is elastically deformed, and then the gap between the connecting flange and the condenser is closed to prevent the copper liquid from leaking out.

Description of drawings

Fig. 1 is the installation status diagram of the present invention.

Fig. 2 is a structural schematic diagram of the inner mandrel in the present invention.

Fig. 3 is a top view of the inner mandrel in the present invention.

Markings in the figure: 1. melting furnace, 101, molten copper gate, 2. fixed plate, 3. inner mandrel, 301, connecting flange, 302, mandrel, 303, ingate, 304, ingate, 305, ring groove, 306, bolt hole I, 307, bolt hole II, 4, condenser, 401, water inlet, 402, water outlet, 5, copper pipe, 6, pulling device.

Detailed ways

The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.

As shown in the figure, an inner mandrel assembly for large-diameter copper pipe continuous casting includes an inner mandrel 3, a fixed plate 2 and a condenser 4. The fixed plate 2 is sleeved in a copper alloy smelting furnace through a through hole in its center. 1 On the copper liquid gate 101 at the bottom, the inner mandrel 3 is composed of a mandrel 302 sleeved in the through hole of the connecting flange 301, and the connecting flange 301 fixes the inner mandrel 3 on the fixed plate 2 and the condenser 4, and the upper and lower surfaces of the fixed plate 2 are provided with a high-temperature sealing ring surrounding the central through hole of the fixed plate 2.

The upper end of the mandrel 302 passes through the through hole in the center of the connecting flange 301 and the fixing plate 2 in turn, and then connects with the molten copper gate 101 at the bottom of the melting furnace 1 , and the lower end of the mandrel 302 extends into the condenser 4 and connects with the condenser. A tubular cavity formed by a copper tube is formed between the inner walls of the device 4, and an ingate 303 for the copper liquid to flow through is arranged in the mandrel 302 along the length direction of the mandrel 302. The liquid gate 101 is connected, and the lower end is closed, and a plurality of ingates 304 perpendicular to the ingate 303 and communicating with the ingate 303 are arranged around the ingate 303 on the side wall near the lower end of the mandrel 302, and the ingate 304 opens above the tubular cavity of the condenser 4 .

The lower surface of the connecting flange 301 is provided with an annular groove 305 surrounding the mandrel 302, and a high temperature resistant elastic sealing ring is arranged in the annular groove 305. The height of the elastic sealing ring is greater than the depth of the annular groove 305, so as to protrude from the The ring groove 305 and the bolt hole I 306 and the bolt hole II 307 connected to the fixed plate 2 and the condenser 4 are respectively provided on the connecting flange 301 , wherein the bolt hole I 306 is located on the bottom surface of the ring groove 305 .

The condenser 4 includes a water inlet 401, a water outlet 402, and a pulling device 6 arranged at the lower end of the condenser 4 and connected to the copper pipe 5 formed in the condenser 4, wherein the water inlet 401 is arranged at the bottom of the condenser 4 The lower part, the water outlet 402 is arranged on the upper part of the condenser 4, so that the flow direction of the condensed water is opposite to the flow direction of the copper liquid. 301, and fasten them together with bolts, and set a high-temperature gasket between the two.

The installation method between the inner mandrel assembly and the large-diameter copper tube continuous casting equipment is as follows:

(1) Fix the fixed plate 2 and the smelting furnace 1 with bolts, and make the through hole in the center of the fixed plate 2 be set on the molten copper gate 101 of the smelting furnace 1;

(2) Then connect the connecting flange 301 of the inner mandrel 3 with the flange on the condenser 4 through bolts;

(3), then fix the inner mandrel 3 fixed on the condenser 4 to the fixed plate 2 through its connecting flange 301 ;

(4) Finally, install the pulling device 6 on the lower end of the condenser 4, connect the water inlet 401 to the water inlet pipe, and connect the water outlet 402 to the water storage tank.

Utilize above-mentioned equipment, carry out the processing method of continuous casting of large diameter copper tube as follows: After above-mentioned equipment is connected, firstly metal copper is smelted into molten copper in smelting furnace 1, then opens smelting furnace 1 and is used for sealing molten copper sprue 101 The blockage 102 of the copper liquid is made to enter the ingate 303 on the inner mandrel 3 through the copper liquid gate 101, and flows out from the ingate 304 on the side of the ingate 303, and flows into the tubular cavity of the condenser 4, Through the condensation of the condensed water in the condenser 4, the copper liquid is continuously crystallized and solidified to form a tube parison, and then the large-diameter copper tube of a required length is continuously pulled out by the pulling device 6 .

After adopting the invention, the connection problem of the inner mandrel assembly in the existing large-diameter copper pipe continuous casting technology is realized, and the assembly design is simple, the installation and maintenance are convenient, the performance is reliable, and the equipment investment cost is low.

Claims (3)

1. a large diameter copper pipe continuous casting inner core rod assembly, be arranged on the bottom of smelting furnace (1), smelting furnace (1) hearth center opening also stretches out downwards to form the copper liquid cast gate (101) flowed out for copper liquid, it is characterized in that: this assembly comprises the fixed head (2) being fixedly installed on smelting furnace (1) bottom, inner core rod (3) and condenser (4), fixed head (2) center is provided with through hole and is set on described copper liquid cast gate (101), described inner core rod (3) is set in the through hole at an adpting flange (301) center by mandrel (302) and forms, and inner core rod (3) is fixedly connected between fixed head (2) and condenser (4) by adpting flange (301), the upper end of described mandrel (302) passes the through hole at adpting flange (301) and fixed head (2) center successively, then be connected with the copper liquid cast gate (101) of described smelting furnace (1), the lower end of mandrel (302) is stretched in described condenser (4), the shaping tubular cavity of copper pipe is formed with the inwall of condenser (4), the upper center, one end be connected with copper liquid cast gate (101) of mandrel (302) arranges along mandrel (302) length direction the ingate (303) that copper liquid flows through, the lower end sidewall of ingate (303) is arranged multiple ingate perpendicular to ingate (303) (304), ingate (304) is opened on the tubular cavity upper end of condenser (4), the copper liquid melted through smelting furnace (1) flows into the ingate (303) of inner core rod (3) by the copper liquid cast gate (101) of smelting furnace (1), and flowed in the tubular cavity of condenser (4) by ingate (304), form copper pipe (5).

2. a kind of large diameter copper pipe continuous casting inner core rod assembly according to claim 1, is characterized in that: the lower end of described condenser (4) arranges pulling device (6), and pulling device (6) is connected with the copper pipe formed in condenser (4).

3. a kind of large diameter copper pipe continuous casting inner core rod assembly according to claim 1, it is characterized in that: at the lower surface of described adpting flange (301), annular groove (305) is set around mandrel (302), and elastic sealing ring is set in annular groove (305), and the height of elastic sealing ring is greater than the degree of depth of annular groove (305), the upper and lower surface of described fixed head (2) is respectively equipped with the high-temperature seal ring around fixed head (2) central through hole.