CN110899663A

CN110899663A - Automatic adjusting and sealing mechanism for top liquid lifting pipe of anti-gravity casting machine

Info

Publication number: CN110899663A
Application number: CN201911166905.5A
Authority: CN
Inventors: 曹福洋; 孙剑飞; 宁志良; 黄永江; 彭德林; 邱子傲
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-03-24
Anticipated expiration: 2039-11-25
Also published as: CN110899663B

Abstract

An automatic adjusting and sealing mechanism for a top-type riser tube of a counter-gravity casting machine relates to a sealing mechanism, which comprises a riser tube and a middle partition plate, wherein the riser tube is mainly formed by a flange and a tube body into a whole from top to bottom; it also comprises a sealing gasket, a riser tube supporting plate and an elastic element; the middle part of the lift tube supporting plate is provided with an insertion hole, the upper end face of the lift tube supporting plate is provided with an elastic element with a through hole, the tube body penetrates through the insertion hole and the through hole and is fixedly connected with the lift tube supporting plate, the flange is in contact with the elastic element, the middle partition plate is inserted on the upper end face of the flange and is in sealing connection with the flange. The invention overcomes the problem of sealing failure of the riser tube caused by deformation of the middle partition plate and can ensure smooth differential pressure pouring.

Description

Automatic adjusting and sealing mechanism for top liquid lifting pipe of anti-gravity casting machine

Technical Field

The invention relates to a sealing mechanism, in particular to an automatic adjusting sealing mechanism for an upper jacking liquid lifting pipe of a antigravity casting machine.

Background

The general non-continuous production antigravity casting machine (differential pressure or low pressure casting machine) has the advantages of no need of moving the lower tank and simple structure. The liquid lifting pipe is inserted into the crucible of the holding furnace in the lower tank through a through hole arranged on the middle partition plate (or the working platform), and then the casting mould is placed on the middle partition plate or the working platform. The upper sealing ring and the lower sealing ring on the liquid lifting pipe flange are pressed by the weight of the casting mould and the locking force of the casting mould and the middle partition plate, so that the liquid lifting pipe and the casting mould and the liquid lifting pipe and the lower tank are sealed. The method for placing the lift tube is suitable for small-batch production of single-piece and discontinuous pouring.

For continuous or semi-continuous antigravity casters, the riser tube is placed directly on a horizontally running lower pot, holding or melting integrated furnace. This process can be carried out at a melting station where the riser tube is placed directly on a support above the crucible after the alloy has been melted and refined. When the lower tank moves to a pouring station along the horizontal rail, the lower tank is lifted to the right position by the lifting mechanism, and the flange at the upper end of the liquid lifting pipe is also jacked to the preset position of the middle clapboard. When the lower tank is locked (or pressed) with the middle partition plate, the sealing gasket on the riser pipe flange is tightly propped against the middle partition plate, so that the sealing of the riser pipe and the middle partition plate is realized. The structure can reduce the operation time of placing the liquid lifting pipe when the lower tank runs to the pouring station, and can improve the production efficiency. However, this riser placement method has a structural disadvantage. When the pressure in the lower tank is higher than the pressure in the upper tank during differential pressure casting, the pressure on the lower tank side of the middle partition plate is higher than the pressure on the upper tank side. Under the action of such unbalanced pressure, the central portion of the intermediate partition (riser contact portion) is elastically deformed to be convex upward. Once this elastic deformation causes the gap created between the lift tube and the intermediate partition to exceed the effective sealing range of the gasket, the seal between the lift tube and the intermediate partition will fail. Therefore, the pressure difference between the upper tank and the lower tank cannot be established, and the pouring work cannot be carried out.

Disclosure of Invention

The invention provides an automatic adjusting and sealing mechanism for an upper jacking liquid lifting pipe of a antigravity casting machine, aiming at overcoming the defects of the prior art. By utilizing the mechanism, the problem of sealing failure of the riser tube caused by deformation of the middle partition plate is solved, and smooth differential pressure pouring can be ensured.

The technical scheme of the invention is as follows: the automatic regulating and sealing mechanism for the top liquid lifting pipe of the counter-gravity casting machine comprises a liquid lifting pipe and a middle partition plate, wherein the liquid lifting pipe is mainly formed by a flange and a pipe body into a whole from top to bottom; it also comprises a sealing gasket, a riser tube supporting plate and an elastic element; the middle part of the lift tube supporting plate is provided with an insertion hole, the upper end face of the lift tube supporting plate is provided with an elastic element with a through hole, the tube body penetrates through the insertion hole and the through hole of the elastic element and is fixedly connected with the lift tube supporting plate, the flange is in contact with the elastic element, the middle partition plate is inserted on the upper end face of the flange, and the middle partition plate is in sealing connection with the flange.

Further, the elastic element is a belleville spring.

Compared with the prior art, the invention has the following technical effects:

1. the mechanism of the invention has simple structure and reliable work; 2. the automatic adjustment of the sealing of the riser tube is realized, and the problem of sealing failure caused by elastic deformation of the middle partition plate is solved; 3. the butterfly spring is made of high-temperature-resistant materials, so that the hidden danger that the sealing performance is influenced due to the fact that the spring materials are annealed at high temperature is avoided.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a front view of the automatic riser tube adjustment sealing mechanism of the present invention;

FIG. 2 is a front view of the lift tube;

FIG. 3 is a top view of the lift tube;

FIG. 4 is a front view of the gasket;

FIG. 5 is a top view of the gasket;

FIG. 6 is a front view of the support plate;

FIG. 7 is a top view of the support plate;

FIG. 8 is a front view of the belleville spring;

FIG. 9 is a top view of a belleville spring;

FIG. 10 is a schematic view of the arrangement of the present invention as applied to a semi-continuous aluminum alloy antigravity caster.

Detailed Description

As shown in FIG. 1, the automatic adjusting and sealing mechanism for the upper-jacking riser tube of the anti-gravity casting machine comprises a riser tube 26 and a middle partition plate 21, wherein the riser tube 26 is mainly formed by a flange 26-1 and a tube body 26-2 from top to bottom; it further comprises a gasket 23, a riser tube support plate 24 and an elastic member 25;

an insertion hole 24-3 is formed in the middle of the lift tube support plate 24, an elastic element 25 with a through hole is arranged on the upper end face of the lift tube support plate 24, the tube body 26-2 is inserted into the insertion hole 24-3 and the through hole of the elastic element 25, the tube body 26-2 is fixedly connected with the lift tube support plate 24, the flange 26-1 is in contact with the elastic element 25, the middle partition plate 21 is inserted on the upper end face of the flange 26-1, and the middle partition plate 21 is connected with the flange 26-1 in a sealing manner.

As shown in fig. 10, when the pressure in lower tank 11 is higher than the pressure in upper tank 1 during differential pressure casting in the related art, the pressure on the lower tank side of middle diaphragm 21 is higher than the pressure on the upper tank side. Under the action of such unbalanced pressure, the central portion (riser contact portion) of the intermediate partition 21 is elastically deformed to be upwardly convex, causing a gap between the intermediate partition 21 and the flange 26-1, and thus the packing 23 is not compressed tightly, resulting in a sealing failure. The automatic riser pipe adjustment sealing mechanism of the present embodiment is used in a antigravity casting machine (differential pressure or low pressure casting machine) shown in fig. 10. When the lower tank 11 is locked with the upper tank 1 by the middle partition 21 before casting, the distance between the lift tube support plate 24 and the middle partition 21 is pushed to be shortened, and the elastic member 25 placed under the flange 26-1 of the lift tube 26 is compressed to store elastic energy for pushing upwards. When the sealing automatic adjusting structure is adopted, the elastic energy stored in the elastic element 25 arranged below the flange 26-1 can always release upward thrust, and the flange 26-1 is constantly pushed to move upwards to compensate the deformation distance of the middle partition plate 21, so that the sealing gasket 23 automatically keeps a sealing state. The sealing failure phenomenon between the riser tube 26 and the middle partition plate 21 is avoided, and the smooth implementation of the differential pressure casting process is effectively ensured. As shown in FIG. 10, a sprue bush 22 made of a refractory ceramic material is inserted axially into a center bulkhead through-hole of a center bulkhead 21, and the center bulkhead through-hole and a riser pipe 26 form a sprue 4 of a casting cavity 3. The riser tube 26 extends into the alloy crucible 10.

In the above solution, preferably, as shown in fig. 8 to 9, the elastic element 25 is a belleville spring. The belleville springs are arranged in positioning grooves 24-2 of the lift tube supporting plate 24 and are made of high-temperature-resistant nickel-based materials, and the high-temperature-resistant temperature is higher than 600 ℃. The hidden danger that the sealing performance is influenced due to the fact that the spring material is annealed at high temperature is avoided.

As shown in fig. 2-3, a sealing groove 26-3 is formed on the upper end surface of the flange 26-1 of the lift pipe 26, and a sealing gasket 23 is installed in the sealing groove 26-3. As shown in fig. 4-5, the sealing pad 23 is made of flexible graphite or ceramic fiber felt. Easily-accessible raw materials and convenient application. The lift tube 26 is made of silicon carbide or low-carbon steel material. Meet the requirement of strength use. As shown in fig. 6-7, the lift tube support plates 24 are of carbon steel material.

The present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the invention.

Claims

1. The automatic adjusting and sealing mechanism of the top type liquid lifting pipe of the antigravity casting machine comprises a liquid lifting pipe (26) and a middle partition plate (21), wherein the liquid lifting pipe (26) is mainly formed by a flange (26-1) and a pipe body (26-2) into a whole from top to bottom; the method is characterized in that: it also comprises a sealing gasket (23), a riser tube supporting plate (24) and an elastic element (25);

an insertion hole (24-3) is formed in the middle of the lift tube support plate (24), an elastic element (25) with a through hole is arranged on the upper end face of the lift tube support plate (24), the tube body (26-2) penetrates through the insertion hole (24-3) and the through hole of the elastic element (25), the tube body (26-2) is fixedly connected with the lift tube support plate (24), the flange (26-1) is in contact with the elastic element (25), the middle partition plate (21) is inserted on the upper end face of the flange (26-1), and the middle partition plate (21) is in sealing connection with the flange (26-1).

2. The automatic adjusting and sealing mechanism for the upper jacking liquid pipe of the antigravity casting machine according to claim 1, wherein: the elastic element (25) is a belleville spring.

3. The automatic adjusting and sealing mechanism for the upper jacking liquid pipe of the antigravity casting machine according to claim 2, wherein: the butterfly spring is made of a high-temperature-resistant nickel-based material, and the high-temperature-resistant temperature is more than 600 ℃.

4. The automatic adjusting and sealing mechanism for the upper jacking liquid pipe of the antigravity casting machine according to claim 3, wherein: the upper end face of the flange of the riser tube (26) is provided with a sealing groove (26-3), and a sealing gasket (23) is arranged in the sealing groove (26-3).

5. The automatic adjusting and sealing mechanism for the upper jacking liquid pipe of the antigravity casting machine according to claim 4, wherein: the sealing gasket (23) is made of flexible graphite or ceramic fiber felt.

6. The automatic adjusting and sealing mechanism for the upper jacking liquid pipe of the antigravity casting machine according to the claim 1, 2, 3, 4 or 5, is characterized in that: the lift tube support plate (24) is a carbon steel material.

7. The automatic adjusting and sealing mechanism for the upper jacking liquid pipe of the antigravity casting machine according to claim 6, wherein: the liquid lifting pipe (26) is made of silicon carbide or low-carbon steel materials.