Rotary vacuum induction furnace dust removal connector and control method

Abstract

The invention discloses a dust removal interface of a rotary vacuum induction furnace and a control method. The dust removal function of a rotary furnace body in any shape and any rotation is realized. The problem of connection between an evacuation connector on a rotary furnace body and a dust removal pipeline outside the furnace body is solved. Secondly, the vacuum degree in the rotary furnace body during smelting needs to be guaranteed, and the dust removal requirement needs to be met: 1) harmful smoke dust can be smoothly discharged after a dust removal pipeline is connected; 2) combustible dust cannot be burnt and cannot enter a dust removal system to burn a dust removal filter; and 3) the dust removal pipeline has a position which can be opened so as to clean dust accumulation in the pipeline. The invention has the following effects: the problem of connection between the rotary furnace body and the dust removal pipeline outside the furnace body is solved; a full-electric valve is easy to control dust removal; a leakage space does not exist, so that smoke dust is prevented from overflowing; the use space of the furnace is saved; accumulated dust removal and valve maintenance are carried out under the condition of no production; the investment cost is low, and valves and pipelines are customized and purchased on the market.

Description

Technical Field

[0001] The invention belongs to metal material smelting equipment and control methods, and specifically relates to a rotary vacuum induction furnace dust removal interface and control method, specifically a vacuum pipeline using the dust removal interface to connect the dust removal system. Background Art

[0002] There are two types of vacuum induction furnaces in the world. The most common type is that the melting chamber is fixed and the crucible rotates in the melting chamber to achieve pouring. The dust removal interface of this type of furnace is designed around the furnace mouth, which is easier to implement. The other type is that the melting chamber and the crucible are integrated together and rotate at the same time. The design of the ordinary dust removal interface cannot be connected during the rotation of the furnace body. Usually, it can only be naturally discharged into the factory when the melting chamber cover is opened. Since the vacuum induction furnace is in a closed vacuum state during smelting, a large amount of metallurgical dust generated by smelting adheres to the inner wall of the furnace. The air intake valve is used to break the vacuum before opening the furnace cover, causing the dust in the entire furnace chamber to be stirred up. If there is no effective dust removal after breaking the vacuum, the entire factory will be filled with a lot of smoke and dust, seriously polluting the environment. Summary of the invention

[0003] The invention discloses a dust removal interface and a control method for a rotary vacuum induction furnace. The dust removal interface design abandons the conventional idea of ​​setting a dust removal interface on a furnace body, and provides an innovative way of thinking to realize the dust removal function of a rotary furnace body in any shape and any rotation.

[0004] The technical route of the present invention is:

[0005] First, the connection problem between the dust removal pipes outside the rotating furnace body and the furnace body must be solved; secondly, the vacuum degree inside the rotating furnace body during smelting must be guaranteed, and the requirements for dust removal must be met: 1) After the dust removal pipe is connected, harmful smoke can be smoothly discharged; 2) Combustible dust cannot burn and enter the dust removal system to burn the dust filter; 3) There is a position in the dust removal pipe that can be opened to clean the dust accumulation in the pipe.

[0006] Specific technical solutions:

[0007] 1. Connection of the dust removal pipeline of the rotary vacuum induction furnace:

[0008] The vacuum pipe 8 does not rotate integrally with the smelting chamber 9 of the rotary furnace body, but is fixed. The vacuum pipe 8 is connected to the rotary furnace body through a sealed rotary bearing interface fixed on the rotary furnace body. At the vacuum pipe interface 1 at the end of the vacuum pipe 8 leading to the smelting chamber 9 of the rotary furnace body, a section of a self-made vacuum pipe 2 is connected, and the self-made vacuum pipe 2 is connected to the dust removal pipe 5 at the back.

[0009] 2. The dust removal interface configuration of the homemade vacuum pipe and dust removal pipe includes three parts:

[0010] (1) The self-made vacuum pipe 2 and the vacuum pipe interface 1 are connected to the first vacuum butterfly valve 6;

[0011] (2) The other two ends of the self-made vacuum pipe 2 each have a vacuum interface flange, and one end of the vacuum interface flange 4 is opened to form a manual cleaning hole;

[0012] ⑶ A second vacuum butterfly valve 7 is connected between the vacuum interface flange 3 at the other end and the dust removal pipeline 5.

[0013] 3. Control of vacuum dust removal in smelting chamber:

[0014] First, open the first vacuum butterfly valve 6, and add a delay to the control chain. The delay is used for the passivation of the combustible ash in the furnace. After the passivation time is up, open the second vacuum butterfly valve 7; when out of use, close the first vacuum butterfly valve 6 first, and then close the second vacuum butterfly valve 7; the above action logic and chain are controlled by software; each valve can also be controlled separately in maintenance mode, controlled by two buttons, open and close.

[0015] Principle and points of the invention:

[0016] When the smelting chamber 9 needs to be evacuated before smelting, that is, the vacuum pipes 8 and 2 are under negative pressure, the first vacuum butterfly valve 6 near the vacuum pipe is closed to achieve vacuum sealing, which is equivalent to a blind flange; the vacuum system can normally evacuate the smelting chamber 9 through the vacuum pipe evacuation port A to achieve negative pressure smelting in the smelting chamber 9. When dust removal is required before the smelting chamber cover is opened, since the air inlet valve has been opened in advance, when the gas pressure in the furnace is equal to the atmospheric pressure of 1000mbar, the dust removal in the plant is started (the dust removal pipe 5 generates suction). First, open the first vacuum butterfly valve 6, add a delay to the control chain, and open the second vacuum butterfly valve 7 when the set passivation time is reached, the dust removal pipe 5 is fully connected, and the smoke in the furnace is also sucked away by the dust removal port B. During the whole process, two vacuum butterfly valves and pipelines between the two vacuum butterfly valves are configured at the dust removal interface, which can not only firmly seal the smoke and dust to prevent leakage, but also ensure the vacuum degree of the internal vacuum pipeline when it is closed; the two vacuum butterfly valves are designed to ensure that the cleaning of dust falling on the vacuum valve seal when passing through can be carried out during smelting without destroying the vacuum state in the furnace body, which is very important for changing the random vacuum dust breaking generated during the production of the induction furnace.

[0017] The invention points of the present invention:

[0018] ⑴ It mainly solves the problem that various induction furnaces designed on site by users (whether the round furnace cover is removed, the square furnace door is opened, or various shapes of flip-top opening) do not need to use the dust removal interface designed and manufactured in conjunction with the dust removal interface, nor do they need to consider the space and path of the additional dust removal pipeline. The vacuum pipeline can be directly connected to the dust removal pipeline.

[0019] (2) The design of two vacuum valves and the connecting pipe in the middle is better at sealing the vacuum than sealing with one valve, and can ensure the vacuum degree of the internal vacuum pipeline when it is closed.

[0020] The present invention has the following effects:

[0021] ⑴ An appropriate position on the vacuum pipe leading to the smelting chamber is used as an interface, and a section of vacuum pipe is connected to the interface, and the vacuum pipe is connected to the dust removal pipe, which solves the connection problem of the dust removal pipe outside the rotating furnace body and the furnace body;

[0022] ⑵ The dust removal effect is better than that of the ordinary external dust removal interface. When connected to the dust removal system through a closed pipeline, there is no leakage space, which avoids the overflow of smoke and dust;

[0023] ⑶ Fully electric valve, easy to control dust removal;

[0024] ⑷ The dust removal interface has the smallest space requirement, saving the space occupied by the furnace;

[0025] ⑸ Ability to remove dust accumulation and perform valve maintenance without affecting the production of the vacuum furnace;

[0026] ⑹The investment cost is low, and the valves and pipes actually used can be customized and purchased on the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional view of the original vacuum induction furnace body and pipeline;

[0028] Figure 2 The three-dimensional schematic diagram of the vacuum induction furnace body and pipeline (the gray pipeline part is the connection diagram of the vacuum pipeline and the dust removal pipeline after the transformation, the simplified schematic diagram is shown in Figure 3 );

[0029] Figure 3 It is a simplified schematic diagram of the present invention.

[0030] Icon description: vacuum pipe interface 1, self-made vacuum pipe 2, vacuum interface flange 3, vacuum interface flange 4, dust removal pipe 5, first vacuum butterfly valve 6, second vacuum butterfly valve 7, vacuum pipe 8, melting chamber 9, vacuum port A, dust removal port B. DETAILED DESCRIPTION

[0031] When dust removal is required before opening the furnace door (or furnace cover) after the vacuum in the melting chamber of the vacuum induction furnace needs to be broken, the following operations are performed: first, open the air inlet valve to allow air to enter the melting chamber, then press the operation button on the operation interface to automatically control the opening of the first vacuum butterfly valve 6 in sequence. The first vacuum butterfly valve 6 is set with a specific delay time in the program to ensure that the combustible dust is fully passivated in the furnace body; when the set passivation time is reached, open the second vacuum butterfly valve 7, connect the dust removal pipeline 5, and perform the smoke and dust exhaust function through the dust removal port B. Then, the first vacuum butterfly valve 6 and the second vacuum butterfly valve 7 are automatically closed in sequence; you can also manually click each corresponding valve to open and close. The manual mode is mainly considered for the operation application of pipeline cleaning and valve maintenance under maintenance status.

Claims

1. Rotary vacuum induction furnace dust removal interface, characterized in that: The vacuum pipe (8) does not rotate integrally with the melting chamber (9) of the rotating furnace body, but is fixed. The vacuum pipe (8) is connected to the rotating furnace body through a sealed rotating bearing interface fixed on the rotating furnace body; at the end of the vacuum pipe (8) leading to the melting chamber (9) of the rotating furnace body, a section of a self-made vacuum pipe (2) is connected, and the rear of the self-made vacuum pipe (2) is connected to the dust removal pipe (5); The dust removal interface configuration for connecting the self-made vacuum pipe (2) with the dust removal pipe (5) includes three parts: ①The self-made vacuum pipeline ⑵ and the vacuum pipeline interface ⑴ are connected to the first vacuum butterfly valve ⑹; ② Self-made vacuum pipe ⑵ There is a vacuum interface flange at each end, and one end of the vacuum interface flange ⑷ is opened to manually clean the hole; ③ Connect the second vacuum butterfly valve ⑺ between the vacuum interface flange ⑶ at the other end and the dust removal pipe ⑸.

2. The control method of the rotary vacuum induction furnace dust removal interface according to claim 1 is characterized in that: The action logic and interlocking of the dust removal interface are controlled by software; first open the first vacuum butterfly valve ⑹, add a delay to the control interlocking, and open the second vacuum butterfly valve ⑺ after the passivation time is up; when out of use, close the first vacuum butterfly valve ⑹ first, and then close the second vacuum butterfly valve ⑺; each valve can also be controlled individually in maintenance mode, controlled by two buttons, open and close.

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