Furnace cover of vacuum intermediate frequency furnace

Abstract

The utility model discloses a furnace cover of a vacuum intermediate frequency furnace, which comprises a cover body and a four-bar mechanism, and the cover body comprises a flat cover and a rotary cover. The four-bar mechanism comprises a fixed plate, a rotating rod, a connecting rod, a connecting plate, a shaft A, a shaft B, a shaft C and a shaft D; the connecting plate is fixedly connected with the shaft A and the rotating cover, the shaft A is rotationally connected with the fixing plate, the fixing plate is rotationally connected with the rotating rod through the shaft B, the rotating rod is rotationally connected with the connecting rod through the shaft C, and the connecting rod is rotationally connected with the rotating cover through the shaft D. And the connecting rod is fixedly connected with the flat cover into a whole, so that the flat cover is rotationally connected with the rotary cover. The center points of the A shaft, the B shaft, the C shaft and the D shaft form a parallelogram to form a four-bar mechanism. And the lower parts of the flat cover and the rotary cover are fire-resistant cotton bound and fixed by a fire-resistant rope. The cover is simple in structure, the cover body can be folded, and the space size of the vacuum intermediate frequency furnace is not increased.

Description

Technical Field

[0001] The utility model is applied to the field of vacuum smelting of medium frequency furnaces, in particular to a furnace cover covering a furnace mouth of a medium frequency furnace. Background Art

[0002] A vacuum medium-frequency furnace is an intermediate-frequency furnace placed within a vacuum chamber. Under vacuum conditions, it utilizes electromagnetic medium-frequency induction heating to melt the metal in a dry pot into liquid metal. This furnace is suitable for melting metal that is easily oxidized or requires high purity. The vacuum chamber is connected to a vacuum system. To operate the medium-frequency furnace under vacuum conditions, a charging device and temperature measurement device are required on the furnace cover at the top of the vacuum chamber. Examples include the cover and charging device for a vacuum induction melting furnace in CN117824359A, the sliding cover and charging device for a vacuum induction melting furnace in CN220103726U, and a novel vacuum induction furnace in CN213396514U. The covers described in these patents all serve to seal the vacuum chamber. To observe the melting status of the liquid metal within the vacuum medium-frequency furnace, an observation hole is provided on the cover, as in the vacuum medium-frequency furnace with observation device in CN211695855U.

[0003] The above-mentioned medium frequency furnace openings in the vacuum chamber are all open. Although it is convenient for adding materials, measuring temperature and observing, it also has disadvantages, such as the radiation heat dissipation of the molten metal. Especially when a large amount of smoke is generated during the melting of the added materials, the smoke and dust in the vacuum chamber blocks the sight, and the smelting situation of the medium frequency furnace is basically impossible to observe. For this reason, a furnace cover is set at the furnace opening of the medium frequency furnace to prevent radiation heat dissipation, reduce energy consumption, improve melting efficiency, and also alleviate the emission of smoke and dust. CN218238380U provides a medium frequency furnace cover, which feeds protective gas into the medium frequency furnace from the furnace cover to isolate the air and prevent the oxidation of molten steel. The furnace cover is opened and closed using a pressure rod and a rotating shaft mechanism. The pressure rod is pressed down to lift the cover to the required height, and the cantilever is rotated to move the cover. CN202470765U provides a control device for the cover of an induction furnace. The opening and closing operation of the furnace cover is similar to the above-mentioned patent. There is also CN118031641A, a furnace cover device suitable for incubation in a medium frequency furnace, and the furnace cover also rotates to open and close. When these furnace covers are unscrewed, they need to occupy a large space at the furnace mouth of the intermediate frequency furnace. For ordinary intermediate frequency furnaces, they occupy the operating space, but for vacuum intermediate frequency furnaces, the size of the vacuum chamber needs to be increased. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a vacuum medium frequency furnace cover, which utilizes the operating space of the water cooling cable behind the furnace to realize the opening and closing of the furnace cover, thereby achieving the purpose of preventing radiation heat dissipation and slowing down smoke.

[0005] The technical solution adopted by the present invention is as follows: the vacuum medium frequency furnace cover of the present invention includes a cover body and a four-bar linkage mechanism; the cover body includes a flat cover and a rotating cover that are rotatably connected. The four-bar linkage mechanism includes a fixed plate, a rotating rod, a connecting rod, a connecting plate, an A-axis, a B-axis, a C-axis, and a D-axis; the connecting plate is fixedly connected to the A-axis and the rotating cover, and the three are integrated; the A-axis is located on the opposite side of the furnace nozzle and is rotatably connected to the fixed plate; the fixed plate is fixed to the top surface of the furnace shell and is rotatably connected to the rotating rod through the B-axis, the rotating rod is rotatably connected to the connecting rod through the C-axis, and the connecting rod is rotatably connected to the rotating cover through the D-axis. The connecting rod is fixedly connected to the flat cover as a whole, thereby realizing the rotatable connection between the flat cover and the rotating cover. The center distance between the A-axis and the B-axis is consistent with the center distance between the C-axis and the D-axis, and the center distance between the A-axis and the D-axis is consistent with the center distance between the B-axis and the C-axis. In this way, the center points ABCD of the four axes form a parallelogram, forming a four-bar linkage mechanism.

[0006] Furthermore, the upper part of the flat cover and the rotary cover is a flat plate, and the lower part is fire-resistant wool. Small holes are processed on the flat plate, and fire-resistant ropes are passed through the small holes to bind and fix the fire-resistant wool.

[0007] Furthermore, when the cover covers the furnace opening of the intermediate frequency furnace, the furnace nozzle is unobstructed.

[0008] Furthermore, one end of the A-axis is fixedly connected to a sprocket, the sprocket is connected to a driving device through a chain, and the driving device is fixedly installed on the side of the furnace shell.

[0009] The beneficial effects of this utility model are as follows: the structure is simple, and the cover is opened and closed by a single rotation of the four-bar linkage, making it easy to operate. The cover is divided into two foldable parts, eliminating the need to expand the space of the vacuum medium frequency furnace. The cover covers the furnace opening, preventing molten metal from radiating heat, saving energy, and leaving only the furnace nozzle unobstructed, reducing smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0011] Figure 2 This is a schematic top view of the structure of the utility model;

[0012] Figure 3 It is a right side view schematic diagram of the structure of the utility model;

[0013] Figure 4 It is a schematic diagram of the rotation of the four-bar linkage;

[0014] Among them: 1-furnace shell, 2-driving device, 3-cover, 4-sprocket, 5-fixed plate, 6-rotating rod, 7-connecting rod, 8-furnace nozzle, 9-C axis, 10-D axis, 11-B axis, 12-A axis, 13-connecting plate;

[0015] 31-flat cover, 32-rotating cover, 33-small hole. DETAILED DESCRIPTION

[0016] The furnace cover described in this utility model covers the opening of the intermediate frequency furnace, not the vacuum chamber. The front of the intermediate frequency furnace is the direction for steel tapping from the nozzle, while the rear of the furnace is the direction for connecting the water-cooling cables. The welding symbols in the accompanying drawings indicate fixed connections, which can be made using suitable methods such as fasteners, keying, and welding.

[0017] The structure of the vacuum medium frequency furnace cover of the utility model is as shown in the attached Figure 1-3 As shown, it includes a cover body 3 and a four-bar linkage. The cover body 3 includes a flat cover 31 and a rotary cover 32 that are rotatably connected, which are used to cover the furnace mouth of the medium frequency furnace. The upper part of the flat cover 31 and the rotary cover is a flat plate, and the lower part is refractory wool. Small holes 33 are processed on the flat plate, and the small holes 33 are used to pass the refractory rope and bind and fix the refractory wool. Considering the thermal stress deformation of the steel plate during long-term use, the flat plate should be made of refractory materials such as mica, ceramics, refractory glass, etc. The refractory rope can be selected from aluminum silicate fiber rope, graphite rope, etc., which have high refractoriness. The refractory wool is used for thermal insulation. The material of the cover ensures that the cover can be used safely for a long time without deformation.

[0018] The four-bar linkage includes a fixed plate 5, a rotating rod 6, a connecting rod 7, a connecting plate 13, and an A-axis 12, a B-axis 11, a C-axis 9, and a D-axis 10. The fixed plate 5 is fixed to the top surface of the furnace shell 1 and is rotatably connected to the A-axis 12. The A-axis 12 is located on the opposite side of the furnace nozzle 8. When the cover covers the furnace mouth, the furnace nozzle 8 is unobstructed, and the four-bar linkage is located on both sides of the furnace nozzle. In this way, the high-temperature molten steel in the medium-frequency furnace will not burn the four-bar linkage. The connecting plate 13 is fixedly connected to the A-axis and the rotating cover. The three are integrated, and the A-axis and the rotating cover rotate simultaneously. The B-axis 11 is fixedly connected to the fixed plate 5. The B-axis is rotatably connected to one end of the rotating rod 6, and the other end of the rotating rod 6 is fixedly connected to the C-axis 9. The C-axis is rotatably connected to one end of the connecting rod 7, and the other end of the connecting rod 7 is fixedly connected to the D-axis 10. The D-axis is rotatably connected to the rotating cover. The connecting rod 7 is fixedly connected to the flat cover as a whole, and the rotational connection between the flat cover and the rotating cover is achieved through the D-axis.

[0019] At one end of the A-axis 12, a sprocket 4 is fixedly connected, and the sprocket 4 is connected to the driving device 2 through a chain. The driving device 2 is fixedly installed on the side of the furnace shell and includes a motor, a reducer and a driving sprocket. When the motor rotates, the sprocket and the A-axis are driven to rotate through the reducer, the driving sprocket and the chain, as shown in the attached figure. Figure 4 As shown, the A axis and the rotating cover rotate, the rotating cover lifts the D axis and the flat cover, and the flat cover drives the rotating rod 6 to rotate through the C axis. When the center distance between the A axis and the B axis is consistent with the center distance between the C axis and the D axis, and the center distance between the A axis and the D axis is consistent with the center distance between the B axis and the C axis, then the attached Figure 4The center of the A axis 12, B axis 11, C axis 9, and D axis 10, namely ABCD, forms a parallelogram, forming a four-bar linkage. When the A axis drives the rotating cover to rotate, it also drives the rotating rod 6 to rotate, and the flat cover remains horizontal. Figure 4 When the cover is turned to the left, the furnace mouth is opened and the flat cover and the rotary cover are buckled together, which is beneficial for the refractory wool to keep warm. Figure 4 When on the right side of the furnace, the cover covers the furnace opening.

[0020] The beneficial effects of the utility model are as follows: 1) The structure is simple, and a rotatable four-bar linkage is adopted. The cover is opened and closed by a single action rotation, which is easy to operate and does not affect the charging, temperature measurement and observation. 2) The cover is divided into two foldable parts, which occupies a small area in the vacuum cavity. The connection operation space of the water-cooling cable behind the medium frequency furnace can be utilized, and the cover is folded and moved backward, which can be realized within the operation space of the vacuum medium frequency furnace. Existing vacuum medium frequency furnaces can be modified. 3) The cover covers the furnace mouth, which can reduce the radiation heat dissipation of the smelting molten steel, which is beneficial to saving energy and reducing energy consumption. 4) The furnace nozzle is unobstructed, which does not affect the tapping of molten steel and the effect of vacuum on the molten steel. The relatively small size of the furnace nozzle limits the large amount of smoke and dust, avoiding the adverse effects of smoke and dust on the operation observation of the furnace.

[0021] In addition, the fixed plate can be rotatably connected to the B-axis, which can be fixedly connected to the rotating rod, which can be rotatably connected to the C-axis, which can be fixedly connected to the connecting rod, which can be rotatably connected to the D-axis, which can be fixedly connected to the rotating cover. Regardless of how the B-axis, C-axis, and D-axis are connected, as long as the four-bar linkage allows rotation, it will be sufficient.

[0022] The sprocket can be replaced with a gear, the chain drive can be changed to gear rotation, the driving sprocket in the drive device can be changed to a driving gear, or the drive device can be replaced with a hydraulic motor, etc., which are all equivalent replacements.

Claims

1. A vacuum medium frequency furnace cover, characterized by: The invention comprises a cover body and a four-bar linkage; the cover body comprises a flat cover (31) and a rotating cover (32); the four-bar linkage comprises a fixed plate (5), a rotating rod (6), a connecting rod (7), a connecting plate (13), an A axis (12), a B axis (11), a C axis (9), and a D axis (10); the connecting plate (13) is fixedly connected to the A axis (12) and the rotating cover (32) as a whole; the A axis (12) is rotationally connected to the fixed plate (5); the fixed plate (5) is rotationally connected to the rotating rod (6) via the B axis (11); the rotating rod (6) is rotationally connected to the connecting rod (7) via the C axis (9); the connecting rod (7) is rotationally connected to the rotating cover (32) via the D axis (10); the connecting rod (7) is fixedly connected to the flat cover as a whole; The center distance between the A axis (12) and the B axis (11) is consistent with the center distance between the C axis (9) and the D axis (10), and the center distance between the A axis (12) and the D axis (10) is consistent with the center distance between the B axis (11) and the C axis (9).

2. The vacuum medium frequency furnace cover according to claim 1, characterized in that: The upper part of the flat cover (31) and the rotating cover (32) is a flat plate, and the lower part is fire-resistant cotton. Small holes are processed on the flat plate, and fire-resistant ropes are passed through the small holes to bind and fix the fire-resistant cotton.

3. The vacuum medium frequency furnace cover according to claim 1, characterized in that: The fixed plate (5) is fixed to the top surface of the furnace shell, and the A axis (12) is located on the opposite side of the furnace nozzle.

4. The vacuum medium frequency furnace cover according to claim 3, characterized in that: When the cover covers the furnace opening of the intermediate frequency furnace, the furnace nozzle is unobstructed.

5. The vacuum medium frequency furnace cover according to claim 1, characterized in that: One end of the A shaft (12) is fixedly connected to a sprocket, and the sprocket is connected to a driving device through a chain, and the driving device is fixedly installed on the side of the furnace shell.

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