Vacuum melting furnace and its lid assembly

Abstract

The utility model relates to a vacuum smelting furnace and furnace cover subassembly thereof, the furnace cover subassembly includes furnace cover body, fixedly connected with the operation interface of the communication of vacuum smelting furnace cavity on the furnace cover body, still include the switching mechanism of fixed connection on the furnace cover body, the switching mechanism is configured to be able to connect multiple operating mechanism, the operating mechanism at least includes feeding mechanism, temperature sensing mechanism and ramming mechanism, and the switching mechanism can rotate, and be configured to be able to make different operating mechanism dock in operation interface through rotation. The utility model through setting rotatable switching mechanism, integrates multiple operating mechanism such as feeding, temperature sensing, ramming in an organic whole, and makes it can be in turn, accurately docked to same operation interface, greatly simplifies the furnace cover structure, in the smelting process, need not repeatedly dismouting the device of different function, through the switching process action of rotating switching mechanism, the automation degree of smelting operation and production efficiency have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature alloy smelting technology, specifically to a vacuum smelting furnace and its furnace cover assembly. Background Technology

[0002] Vacuum melting furnaces are widely used in the melting and refining of metal materials. Their operation involves multiple processes such as charging and temperature measurement. Traditional furnace covers typically have separate operating interfaces for each function, resulting in complex structures, large space requirements, and inconvenient switching between mechanisms, thus affecting melting efficiency. Furthermore, the ultra-high temperature environment during melting can easily damage the sealing elements of the gate valves installed on the furnace cover, shortening their service life and leading to frequent replacements, thus increasing operating costs.

[0003] Therefore, there is an urgent need for a vacuum melting furnace cover assembly that is compact in structure, flexible in operation, and can effectively protect key components. Utility Model Content

[0004] The purpose of this utility model is to provide a vacuum melting furnace and its furnace cover assembly, which can solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] The first aspect of this utility model provides a furnace cover assembly for a vacuum melting furnace, including a furnace cover body, on which an operating interface communicating with the furnace cavity of the vacuum melting furnace is fixedly connected; it also includes a transfer mechanism fixedly connected to the furnace cover body, the transfer mechanism being configured to connect multiple operating mechanisms, the operating mechanisms including at least a feeding mechanism, a temperature sensing mechanism, and a tamping mechanism, and the transfer mechanism being rotatable and configured to allow different operating mechanisms to be connected to the operating interface by rotation.

[0007] In a preferred embodiment, the operating interface is constructed as a pipe structure with a gate valve and a flange interface fixedly connected to its top end.

[0008] In a preferred embodiment, the transfer mechanism includes a drive cylinder fixedly connected to the top of the furnace cover body and a rotating box connected to the output end of the drive cylinder. The bottom of the rotating box is a bearing rotation structure, and the top is a multi-faceted box structure. Each face of the box is used to connect to the operating mechanism.

[0009] In a preferred embodiment, the feeding mechanism includes a feeding chamber, a hopper that is vertically and flexibly disposed within the feeding chamber, and a drive mechanism for driving the hopper to rise and fall; the bottom of the hopper is connected to a plurality of openable and closable baffles, each baffle forming a conical structure and being bound together by a detachable structure.

[0010] In a preferred embodiment, a plurality of limiting plates corresponding to the positions of the material blocking plates are fixedly connected to the bottom outer wall of the hopper to limit the offset angle of the material blocking plates.

[0011] In a preferred embodiment, the tamping mechanism includes a tamping chamber and a tamping rod that is movably inserted into the tamping chamber; the top of the tamping chamber is connected to a flange cover via a corrugated pipe, the tamping rod passes through a through hole in the flange cover and is locked and fixed by a clamping block, and a sealing structure is embedded in the inner wall of the through hole.

[0012] In a preferred embodiment, the furnace cover assembly further includes a gate valve protection mechanism, which includes a heat insulation group and a drive group. The heat insulation group is disposed inside the smelting furnace and its shape matches the cross-sectional shape of the operating interface. The drive group is fixedly connected to the furnace cover body and its output end is connected to the heat insulation group for driving the heat insulation group to a position corresponding to or offset from the operating interface.

[0013] In a preferred embodiment, the heat insulation assembly includes two layers of clamping plates and heat insulation cotton disposed between the clamping plates; the drive assembly includes a mounting base fixedly connected to the furnace cover body and a drive shaft rotatably connected to the mounting base, the drive shaft passing through the furnace cover body and connected to the clamping plates via a connecting rod.

[0014] The second aspect of this utility model provides a vacuum melting furnace, including the furnace cover assembly described in any of the above embodiments.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The furnace cover assembly provided by this utility model integrates multiple operating mechanisms such as feeding, temperature detection, and tamping into one unit by setting a rotatable transfer mechanism, and enables them to be connected to the same operating interface in sequence and accurately. This greatly simplifies the furnace cover structure. During the smelting process, there is no need to repeatedly disassemble and assemble devices with different functions. The process actions can be switched by rotating the transfer mechanism, which significantly improves the automation level and production efficiency of the smelting operation.

[0017] 2. The tamping mechanism integrated into the furnace cover allows workers to move the molten steel and slag adhering to the inner wall of the crucible and turn over the insufficiently melted masterbatch during the smelting process, thereby promoting the uniformity and completeness of the smelting.

[0018] 3. By setting up a gate valve protection mechanism, the movable heat insulation group can effectively isolate the heat inside the furnace from radiation and conduction to the gate valve during high-temperature smelting operations, thereby protecting the vulnerable sealing ring in the gate valve, extending the service life of the gate valve, and reducing maintenance costs. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the overall structure of the vacuum melting furnace in this embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure of the furnace cover assembly in an embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of the feeding mechanism in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the material storage bin in an embodiment of this utility model;

[0023] Figure 5 This is a schematic diagram of the material tamping mechanism in an embodiment of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the gate valve protection mechanism in an embodiment of this utility model.

[0025] The meanings of the labels in the diagram are as follows:

[0026] 1. Furnace cover body; 2. Operating interface; 21. Slide valve; 3. Transfer mechanism; 31. Drive cylinder; 32. Rotary box; 4. Operating mechanism; 41. Feeding mechanism; 411. Feeding chamber; 412. Material holding bin; 413. Drive mechanism; 414. Partition plate; 415. Material blocking plate; 416. Limiting plate; 42. Temperature detection mechanism; 43. Tamping mechanism; 431. Tamping chamber; 432. Corrugated pipe; 433. Tamping rod; 434. Flange cover; 435. Clamping block; 436. First handwheel; 5. Slide valve protection mechanism; 51. Insulation group; 511. Clamping plate; 512. Insulation cotton; 52. Drive group; 521. Mounting base; 522. Bearing seat; 523. Drive shaft; 524. Connecting rod; 525. Second handwheel. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] See Figures 1-2 This embodiment discloses a furnace cover assembly for a vacuum melting furnace, including a furnace cover body 1. An operation interface 2, communicating with the furnace cavity of the vacuum melting furnace, is fixedly connected to the furnace cover body 1, and a transfer mechanism 3 is also fixedly connected thereto. The transfer mechanism 3 is located at the center of the furnace cover body 1 and is connected to multiple operation mechanisms 4. Each operation mechanism 4 includes at least a feeding mechanism 41, a temperature sensing mechanism 42, and a tamping mechanism 43. The operation interface 2 is located to the side of the transfer mechanism 3. The transfer mechanism 3 is rotatable and configured to allow different operation mechanisms 4 to engage with the operation interface 2 through rotation.

[0030] Specifically, the operating interface 2 is constructed as a pipe structure, with a slide valve 21 and flange interfaces for docking with various operating structures fixedly connected to its top end.

[0031] See Figure 2 The transfer mechanism 3 includes a drive cylinder 31 fixedly connected to the top of the furnace cover body 1 and a rotating box 32 connected to the output end of the drive cylinder 31. The drive cylinder 31 is used to drive the rotating box 32 to rise and fall. The rotating box 32 itself can rotate to facilitate docking between various operating structures and the operating interface 2. The output end of the drive cylinder 31 faces upward and is fixedly connected to a transfer flange. The rotating box 32 is fixedly connected to the transfer flange. The rotating box 32 adopts existing technology, with a bearing rotating structure at the bottom and a multi-faceted box structure at the top. Each face of the box is used to connect to the operating mechanism 4, and the rotating box 32 is driven to rotate manually or electrically. For example, in this embodiment, the rotating box 32 is constructed as a four-faced box structure, and the feeding mechanism 41, the temperature detection mechanism 42, and the tamping mechanism 43 are fixedly connected to different faces of the rotating box 32 through connecting plates.

[0032] See Figure 3 and Figure 4 The feeding mechanism 41 is used for feeding materials, including a feeding chamber 411 and a lifting hopper 412 installed in the feeding chamber 411. The hopper 412 is used to hold materials and can be connected to the material source by setting an inlet and an inlet pipe.

[0033] The top of the feeding chamber 411 is connected to a drive mechanism 413 for driving the lifting and lowering of the holding hopper 412 via a flange interface, and the bottom of the feeding chamber 411 is connected to the operation interface 2 on the furnace cover body 1 via a flange interface.

[0034] To ensure the airtightness of the feeding chamber 411, a partition 414 is bolted between the drive mechanism 413 and the feeding chamber 411. The output end of the drive mechanism 413 passes through the partition 414 and is connected to the top of the holding hopper 412. The drive mechanism 413 adopts a linear conveying mechanism in the prior art, such as a screw drive structure or a sling drive structure. The bottom of the holding hopper 412 is an openable structure. Specifically, multiple openable and closable baffle plates 415 are rotatably connected to the bottom wall of the holding hopper 412. Each baffle plate 415 forms a conical structure. The bottom of the baffle plate 415 is bound together by a detachable structure such as a tie. For example, the tie can be made of hemp fiber or cable ties. The tie can be melted in a high-temperature environment, thereby allowing the material in the holding hopper 412 to be discharged. To prevent the material blocking plate 415 from shifting too much, a number of limiting plates 416 corresponding to the position of the material blocking plate 415 are fixedly connected to the bottom outer wall of the material holding bin 412. The limiting plates 416 are vertically arranged and extend towards the direction of the smelting furnace.

[0035] The temperature detection mechanism 42 adopts existing technology, and its solution has been disclosed in the utility model patent with application number CN202420715116.2 entitled "A high temperature molten steel temperature detection device applied to a vacuum furnace".

[0036] In actual smelting processes, molten steel and slag easily adhere to the inner wall of the crucible in the smelting furnace. Therefore, this embodiment integrates a tamping mechanism 43 on the furnace cover assembly to move the molten steel and slag adhering to the inner wall of the crucible, and also to turn over the insufficiently smelted masterbatch to ensure complete smelting. For details, see... Figure 5The tamping mechanism 43 includes a tamping chamber 431 for docking with the operation interface 2. Flange interfaces are connected to the top and bottom of the tamping chamber 431, with the bottom flange interface docking with the operation interface 2. A bellows 432 is coaxially connected to the top flange interface. A tamping rod 433 capable of vertical displacement passes through the center of the bellows 432. The flexible deformation of the bellows 432 allows the tamping rod 433 to adjust its angle within a certain range, enabling it to contact the target iron slag. More specifically, a flange cover 434 with a central through hole is fixedly connected to the top of the bellows 432. The tamping rod 433 passes through this through hole, fitting with it with a clearance, and is locked in place by a clamping block 435 positioned above the flange cover 434 after its angle is determined. It should be noted that the tamping rod 433 should have a predetermined length, allowing it to extend downwards into the crucible of the melting furnace. The inner wall of the through-hole should be fitted with a sealing structure to ensure a vacuum operating environment within the melting furnace. The sealing structure should be made of a high-temperature resistant and elastic material, such as fluororubber or nitrile rubber, ensuring sealing performance without affecting the movement of the tamping rod 433. A first handwheel 436 is also connected to the top of the tamping rod 433 for manually driving the tamping rod 433 to achieve vertical feed movement.

[0037] Combination Figure 6 In a preferred embodiment, the furnace cover assembly further includes a gate valve protection mechanism. In practical applications, the gate valve 21 corresponds to the top of the crucible inside the vacuum melting furnace. The sealing ring in the gate valve 21 is easily damaged by the high temperature of the crucible inside the furnace during the melting operation. By setting the gate valve protection mechanism, heat is isolated between the gate valve 21 and the crucible in the melting furnace, so as to protect the sealing ring of the gate valve 21 and extend its service life.

[0038] Specifically, the gate valve protection mechanism includes a heat insulation group 51 and a drive group 52. The heat insulation group 51 is located inside the smelting furnace and corresponds to the position of the operation interface 2. The drive group 52 is fixedly connected to the furnace cover body 1 and is used to drive the heat insulation group 51 to move.

[0039] More specifically, the insulation assembly 51 includes two layers of clamping plates 511 that match the cross-sectional shape of the operating interface 2, and insulation cotton 512 disposed between the two clamping plates 511. All three are secured with detachable bolts and nuts. The insulation assembly 51 should be positioned as close as possible to the bottom of the operating interface 2 to achieve good insulation. The drive assembly 52 includes a mounting base 521 fixedly connected to the furnace cover body 1 and a drive shaft 523 rotatably connected to the mounting base 521 via a bearing seat 522. The drive shaft 523 passes through the furnace cover body 1, and its bottom is fixedly connected to the top clamping plate 511 via a connecting rod 524 of a certain length. A second handwheel 525 is fixedly connected to the top of the drive shaft 523. Rotating the second handwheel 525 drives the drive shaft 523 to rotate, thereby driving the insulation assembly 51 to rotate, thus enabling switching between the feeding / retrieving mode and the operating mode. It is understood that a sealing structure should be installed between the drive shaft 523 and the furnace cover body 1 to ensure a vacuum operating environment inside the furnace.

[0040] In practical applications, the masterbatch is fed into the melting furnace crucible via the feeding mechanism 41. The crucible is heated to melt the masterbatch. During this process, the color of the molten steel is observed through the furnace's viewing window. When the color of the molten steel reaches the required level, the transfer mechanism 3 rotates the temperature sensing mechanism 42 to the operating interface 2, opens the gate valve 21, and detects the composition and temperature of the molten steel. If the composition is lower than the target value, a second feeding action can be performed via the feeding mechanism 41. During the melting process, the tamping rod 433 of the tamping mechanism 43 tumbles any insufficiently melted masterbatch or pushes the slag adhering to the crucible wall into the molten steel. During the melting operation, the heat insulation group 51 of the gate valve protection mechanism is rotated to the bottom of the operating interface 2 to protect the gate valve 21. During feeding, temperature sensing, and tamping, the second handwheel 525 is rotated to move the heat insulation group 51 away from the bottom of the operating interface 2.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A furnace cover assembly for a vacuum melting furnace, comprising a furnace cover body (1), characterized in that: An operation interface (2) that communicates with the furnace cavity of the vacuum melting furnace is fixedly connected to the furnace cover body (1); It also includes a transfer mechanism (3) fixedly connected to the furnace cover body (1). The transfer mechanism (3) is configured to connect multiple operating mechanisms (4). The operating mechanism (4) includes at least a feeding mechanism (41), a temperature sensing mechanism (42), and a tamping mechanism (43). The transfer mechanism (3) is rotatable and is configured to allow different operating mechanisms (4) to be connected to the operating interface (2) by rotation.

2. The furnace cover assembly according to claim 1, characterized in that, The operating interface (2) is constructed as a pipe structure, with a slide valve (21) and a flange interface fixedly connected to its top end.

3. The furnace cover assembly according to claim 1, characterized in that, The transfer mechanism (3) includes a drive cylinder (31) fixedly connected to the top of the furnace cover body (1) and a rotating box (32) connected to the output end of the drive cylinder (31). The bottom of the rotating box (32) is a bearing rotation structure, and the top is a multi-faceted box structure. Each face of the box is used to connect the operating mechanism (4).

4. The furnace cover assembly according to claim 1, characterized in that, The feeding mechanism (41) includes a feeding chamber (411), a hopper (412) that is vertically and vertically disposed in the feeding chamber (411), and a drive mechanism (413) for driving the hopper (412) to rise and fall. The bottom of the hopper (412) is connected to a plurality of openable and closable baffle plates (415), which form a conical structure and are bound together by a detachable structure.

5. The furnace cover assembly according to claim 4, characterized in that, The bottom outer wall of the hopper (412) is fixedly connected with several limiting plates (416) corresponding to the position of the blocking plate (415) to limit the offset angle of the blocking plate (415).

6. The furnace cover assembly according to claim 1, characterized in that, The tamping mechanism (43) includes a tamping chamber (431) and a tamping rod (433) that is movably inserted into the tamping chamber (431). The top of the tamping chamber (431) is connected to a flange cover (434) through a corrugated pipe (432). The tamping rod (433) passes through the through hole of the flange cover (434) and is locked and fixed by a clamping block (435). The inner wall of the through hole is fitted with a sealing structure.

7. The furnace cover assembly according to claim 2, characterized in that, The furnace cover assembly also includes a gate valve protection mechanism, which includes a heat insulation group (51) and a drive group (52). The heat insulation group (51) is located inside the smelting furnace and its shape matches the cross-sectional shape of the operation interface (2). The drive group (52) is fixedly connected to the furnace cover body (1) and its output end is connected to the heat insulation group (51) to drive the heat insulation group (51) to a position corresponding to or offset from the operation interface (2).

8. The furnace cover assembly according to claim 7, characterized in that, The heat insulation assembly (51) includes two layers of clamping plates (511) and heat insulation cotton (512) disposed between the clamping plates (511); the drive assembly (52) includes a mounting base (521) fixedly connected to the furnace cover body (1) and a drive shaft (523) rotatably connected to the mounting base (521). The drive shaft (523) passes through the furnace cover body (1) and is connected to the clamping plate (511) through a connecting rod (524).

9. A vacuum melting furnace, characterized in that, Includes the furnace cover assembly as described in any one of claims 1-8.

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