Flue gas collecting device of medium-frequency induction furnace

Abstract

The utility model belongs to the technical field of medium-frequency induction furnaces, and particularly relates to a flue gas collecting device of a medium-frequency induction furnace, which comprises a hollow smoke hood, a round hole arranged at the bottom of the smoke hood, a furnace cover arranged in the round hole, an arc-shaped annular flow guide hood fixedly arranged on the periphery of the round hole, and a square opening arranged at the tail of the smoke hood and communicated with the round hole. A notch corresponding to the square opening in the tail of the smoke hood is formed in the rear end of the annular flow guide hood; a flow guide assembly is connected to the rear end of the smoke hood and comprises a flow guide groove fixedly connected with the tail of the smoke hood, notches are formed in the rear face, the bottom face and the front face of the flow guide groove and communicated with an opening in the tail of the smoke hood, and a trapezoidal flow guide hood is fixedly connected to the rear surface of the flow guide groove. A notch is formed in the bottom of the trapezoidal flow guide cover and corresponds to a notch formed behind the flow guide groove; the smoke collecting and dust removing device is obvious in smoke collecting and dust removing effect, improves the recovery rate of accumulated dust of auxiliary products of raw materials for smelting, not only can effectively improve the smelting operation environment, but also can improve the utilization rate of the smelting materials, and saves the production cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of medium-frequency induction furnaces, specifically relating to a flue gas collection device for medium-frequency induction furnaces. Background Technology

[0002] A medium-frequency induction furnace is a device that rectifies three-phase AC power into DC power, then converts the DC power into an adjustable current. This DC current is supplied to the alternating current flowing through a capacitor and an induction coil, generating a high-density magnetic field in the induction coil. This magnetic field cuts through the metal material placed within the coil, inducing large eddy currents within the metal. These eddy currents also exhibit some properties of medium-frequency currents, namely, the free electrons within the metal itself flowing through a resistive metal body generate heat. This process achieves the purpose of melting the target metal.

[0003] During the smelting process in a medium-frequency induction furnace, a large amount of smoke and dust is generated due to impurities in the raw materials and the burning of the materials themselves. The traditional method is to install a smoke exhaust assembly above the furnace cover and a smoke exhaust hood above the furnace platform, with an external dust collector to collect the smoke and dust.

[0004] The publicly disclosed document, "A Dust Removal Device for an Induction Furnace" (application number 201420724131X), describes a dust removal device for an induction furnace, including a steel structure for the fume hood shell, a small furnace cover, a suction channel, a fume arm tilting cylinder, a fume hood tilting cylinder, a front tilting slewing bearing for the fume hood, a rear tilting slewing bearing for the fume hood, furnace cover support feet, and supports. However, in actual use, the fume extraction effect is poor, especially during high-power smelting processes, where dust leaks along the perimeter of the furnace cover. During the pouring of molten metal, a large amount of dust leaks along the furnace body outlet, and relying solely on the fume hood above the furnace platform for dust collection is ineffective. Based on these circumstances, most medium-frequency induction furnace production workshops have poor working environments, and the recovery of burnt raw materials is ineffective, leading to difficulties in recruiting workers for this position and persistently high costs for enterprises.

[0005] Based on the above problems, this utility model provides a flue gas collection device for medium-frequency induction furnaces, which strengthens the smoke collection measures at specific stages of smoke leakage, and achieves zero smoke leakage during the smelting and pouring of molten metal in medium-frequency induction furnaces. Utility Model Content

[0006] In order to solve the above-mentioned technical problems, this utility model provides a medium-frequency induction furnace flue gas collection device, which has a simple structure, is easy to use, has a significant comprehensive flue gas collection effect, can achieve zero leakage of flue gas and dust, and effectively improves the smelting working environment.

[0007] The technical solution adopted by this utility model is as follows: a flue gas collection device for a medium-frequency induction furnace, including a fume hood, which is a hollow structure. A circular hole is opened at the bottom of the fume hood, and a furnace cover is placed inside the circular hole. The furnace cover is circular, and connecting parts are provided around the furnace cover. The furnace cover is fixedly connected to the inner top surface of the fume hood through the connecting parts. The bottom surface of the furnace cover and the bottom surface of the fume hood are at the same level. An arc-shaped annular guide hood is fixedly provided around the circular hole at the bottom of the fume hood. A square opening communicating with the circular hole is provided at the tail of the fume hood, and a notch corresponding to the square opening at the tail of the fume hood is provided at the rear end of the annular guide hood. A guide assembly is connected to the rear end of the fume hood, and the guide assembly includes components connected to the tail of the fume hood. The guide channel is fixedly connected, with notches on its rear, bottom, and front surfaces. These notches communicate with the opening at the rear of the fume hood. A trapezoidal guide hood is fixedly connected to the rear surface of the guide channel, with a notch at the bottom that corresponds to the notch on the rear of the guide channel. The head of the fume hood is cylindrical, and its right side is connected to the exhaust assembly via a rotating fixing component. The angle of the fume hood is adjusted via the rotating fixing component. Support components are connected to both the inner side of the exhaust assembly and the outer side of the fume hood. The support components fix the fume hood and the exhaust assembly on the upper surface of the medium-frequency induction furnace and enable the opening and closing of the fume hood and the exhaust assembly. The exhaust assembly is connected to the pipes of the purification system.

[0008] The smoke exhaust assembly includes a first smoke exhaust pipe, which is connected to a rotating and fixing assembly. A support assembly is fixedly connected to the left end of the first smoke exhaust pipe. The rear right end of the first smoke exhaust pipe is connected to a second smoke exhaust pipe. One end of the second smoke exhaust pipe is connected to the first smoke exhaust pipe, and the other end is connected to the left end of the third smoke exhaust pipe. The front right end of the third smoke exhaust pipe is connected to a fourth smoke exhaust pipe, and the fourth smoke exhaust pipe is connected to the pipes of the purification system.

[0009] The support assembly includes a support arm, one end of which is fixedly connected to the rear left side of the first exhaust pipe, and the other end is rotatably connected to a first support fixedly mounted on the upper surface of the medium-frequency induction furnace. A U-shaped support rod a is fixedly connected to the front left side of the first exhaust pipe. The U-shaped support rod a is fixedly connected to the front end of a vertical support rod. The vertical support rod is vertically positioned. A fume hood head support is fixedly mounted on the left side of the fume hood head. The top of the vertical support rod is rotatably connected to the fume hood head support. A horizontal support rod is fixedly connected to the rear end of the vertical support rod. The horizontal support rod is horizontally positioned. A second support is rotatably connected to the rear end of the horizontal support rod. The second support is fixedly mounted on the upper surface of the medium-frequency induction furnace on the left side of the fume hood. A U-shaped support rod b is fixedly positioned below the left side of the first exhaust pipe, corresponding to the vertical support rod.

[0010] The diameter of the annular guide shroud is determined by the formula D=k1d, where: D is the diameter of the annular guide shroud; k1 is the diameter coefficient of the annular guide shroud, and the value of k1 ranges from 1.05 to 1.15; d is the diameter of the inlet of the medium-frequency induction furnace.

[0011] The length of the lower base of the trapezoidal guide shroud is determined by the formula A=k2a, the length of the upper base of the trapezoidal guide shroud is determined by the formula B=k2b, the width of the trapezoidal guide shroud is determined by the formula C=k2c, and the height of the trapezoidal guide shroud is determined by the formula E=k2e. In the formulas: A, B, C, and E correspond to the length of the lower base, the length of the upper base, the width, and the height of the trapezoidal guide shroud, respectively; a, b, c, and e correspond to the length of the lower base, the length of the upper base, the width, and the height of the outlet of the medium-frequency induction furnace, respectively; k2 is the trapezoidal guide shroud coefficient, and the value range of k2 is 1.4-1.8.

[0012] The rotating fixing assembly includes two flanges, which are connected to the right side of the fume hood head and the left side of the first exhaust pipe, respectively. The inner sides of the two flanges are rotatably connected by a slewing bearing, and the flanges are fixed with locating pins.

[0013] The top of the smoke hood has a groove, and a handle is located at the front end of the top of the groove.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention features a simple structure and convenient operation. During the smelting process of a medium-frequency induction furnace, fumes leak from around the furnace cover and cannot be collected in a timely manner. By setting up an annular guide hood and clearly defining its size, the fumes leaking from around the furnace cover can be collected and then enter the purification system through the exhaust assembly. After the medium-frequency induction furnace has finished smelting, during the pouring process, a trapezoidal guide hood is set up, and its size is clearly defined according to the size of the furnace outlet. This allows the fumes generated during the pouring process to be collected by the trapezoidal guide hood and guided into the fume hood, then enter the purification system through the exhaust assembly. The overall fume collection effect is significant, achieving zero fume leakage, greatly reducing the impact of fume on the working environment, and effectively reducing the risk of operators inhaling fume. Attached Figure Description

[0016] Figure 1 This is a top-view three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a rear-view three-dimensional structural diagram of the present invention;

[0018] Figure 3 This is a right-view three-dimensional structural diagram of the present invention;

[0019] Figure 4 This is a three-dimensional structural diagram of the present invention viewed from below.

[0020] The diagram is labeled as follows: 1. Fume hood; 2. Furnace cover; 3. Annular guide hood; 4. Guide assembly; 41. Guide channel; 42. Trapezoidal guide hood; 5. Rotating and fixing assembly; 6. Smoke exhaust assembly; 61. First smoke exhaust pipe; 62. Second smoke exhaust pipe; 63. Third smoke exhaust pipe; 64. Fourth smoke exhaust pipe; 7. Support assembly; 71. Support arm; 72. First support; 73. Fume hood head support; 74. Second support; 75. U-shaped support rod a; 76. Vertical support rod; 77. Horizontal support rod; 78. U-shaped support rod b; 8. Handle. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1-4As shown, a flue gas collection device for a medium-frequency induction furnace includes a fume hood 1, which is a hollow structure. The top of the fume hood 1 has a groove, and a handle 8 is located at the front end of the top of the groove. A circular hole is opened at the bottom of the fume hood 1, and a furnace cover 2 is placed inside the circular hole. The furnace cover 2 is circular, and connecting parts are provided around its perimeter. The furnace cover 2 is fixedly connected to the inner top surface of the fume hood 1 via the connecting parts. The bottom surface of the furnace cover 2 is at the same level as the bottom surface of the fume hood 1. An arc-shaped annular guide shroud 3 is fixedly installed around the circular hole at the bottom of the fume hood 1. The tail of the fume hood 1 has a square opening communicating with the circular hole. The rear end of the annular guide shroud 3 has a notch corresponding to the square opening at the tail of the fume hood 1. The rear end of the fume hood 1 is connected to... A flow guiding component 4 is provided, which includes a flow guiding groove 41 fixedly connected to the tail of the smoke hood 1. The flow guiding groove 41 has notches on its rear, bottom, and front surfaces, which communicate with the opening at the tail of the smoke hood 1. A trapezoidal flow guiding hood 42 is fixedly connected to the rear surface of the flow guiding groove 41. The bottom of the trapezoidal flow guiding hood 42 has a notch that corresponds to the notch on the rear of the flow guiding groove 41. The head of the smoke hood 1 is cylindrical, and its right side is connected to the smoke exhaust component 6 via a rotating fixing component 5. The smoke exhaust component 6 includes a first smoke exhaust pipe 61, the rear right end of which is connected to a second smoke exhaust pipe 62. One end of the second smoke exhaust pipe 62 is connected to the first smoke exhaust pipe 61, and the other end is connected to a third smoke exhaust pipe 62. The left end of the smoke pipe 63 and the front right end of the third smoke pipe 63 are connected to the fourth smoke pipe 64, which is connected to the pipes of the purification system. The rotating and fixing assembly 5 includes two flanges, which are respectively connected to the right side of the head of the fume hood 1 and the left side of the first smoke pipe 61. The inner sides of the two flanges are rotatably connected by a slewing bearing, and the flanges are fixed with positioning pins. The inner side of the smoke exhaust assembly 6 and the outer side of the fume hood 1 are both connected to the support assembly 7. The support assembly 7 includes a support arm 71. One end of the support arm 71 is fixedly connected to the rear left end of the first smoke pipe 61, and the other end is rotatably connected to the first support 72 fixedly installed on the upper surface of the medium frequency induction furnace. The first smoke pipe 61 A U-shaped support rod a75 is fixedly connected to the front side of the left end. The U-shaped support rod a75 is fixedly connected to the front end of the vertical support rod 76. The vertical support rod 76 is set vertically. A fume hood head support 73 is fixedly set at the left end of the head of the fume hood 1. The top of the vertical support rod 76 is rotatably connected to the fume hood head support 73. The rear end of the vertical support rod 76 is fixedly connected to the horizontal support rod 77. The horizontal support rod 77 is set horizontally. The rear end of the horizontal support rod 77 is rotatably connected to the second support 74. The second support 74 is fixedly set on the upper surface of the medium frequency induction furnace on the left side of the fume hood 1. The U-shaped support rod b78 is fixedly set at the lower left of the first exhaust pipe 61, corresponding to the vertical support rod 76.

[0023] During operation, the operator opens the fume hood 1 using the U-shaped support rod a75, which simultaneously raises the support arm 71, the first exhaust pipe 61, and the second exhaust pipe 62. The operator then places the raw material to be melted into the furnace opening of the medium-frequency induction furnace. After placement, the operator closes the fume hood 1 using the U-shaped support rod a75, causing the support arm 71, the first exhaust pipe 61, and the second exhaust pipe 62 to rise and fall. The furnace cover 2 then covers the furnace opening. The flue gas passes through the fume hood 1 into the exhaust assembly 6, and then into the purification system. The annular guide hood 3 guides the overflowing gas around the furnace cover 2. The flue gas gathers and enters the fume hood 1 to prevent it from leaking out. After melting, the liquid is poured out. The operator opens the fume hood 1 using the U-shaped support rod a75. The medium-frequency induction furnace tilts towards the outlet so that the liquid can flow out along the outlet. As the liquid flows out, the flue gas enters the fume hood 1 under the action of the trapezoidal guide hood 42, then enters the exhaust assembly 6, and finally enters the purification system. When the angle of the fume hood 1 needs to be adjusted individually, the operator adjusts the angle of the fume hood 1 individually using the handle 8 and the rotating fixing assembly 5.

[0024] Taking a 3-ton medium-frequency induction furnace as an example:

[0025] The diameter of the annular guide shroud 3 is determined by the formula D=k1d, where: D is the diameter of the annular guide shroud 3; k1 is the diameter coefficient of the annular guide shroud 3, k1 is 1.06; and d is the diameter of the inlet of the medium frequency induction furnace.

[0026] D = 1.06 × 1230 mm = 1350 mm

[0027] The length of the lower bottom edge of the trapezoidal guide shroud 42 is determined by the formula A=k2a, where: A is the length of the lower bottom edge of the trapezoidal guide shroud 42, a is the length of the lower bottom edge of the outlet of the medium frequency induction furnace, and k2 is the coefficient of the trapezoidal guide shroud 42, which is 1.6.

[0028] A = 1.6 × 500 mm = 800 mm;

[0029] The length of the upper bottom edge of the trapezoidal guide shroud 42 is determined by the formula B=k2b, where: B is the length of the upper bottom edge of the trapezoidal guide shroud 42, b is the length of the upper bottom edge of the outlet of the medium frequency induction furnace, and k2 is the coefficient of the trapezoidal guide shroud 42, with a value range of 1.4-1.8.

[0030] B = 1.8 × 300 mm = 540 mm;

[0031] The width of the trapezoidal guide shroud 42 is determined by the formula C=k2c, where: C is the width of the trapezoidal guide shroud 42, c is the width of the water outlet of the medium frequency induction furnace, and k2 is the coefficient of the trapezoidal guide shroud 42, with a value range of 1.4-1.8.

[0032] C = 1.6 × 450 mm = 720 mm;

[0033] The height of the trapezoidal guide shroud 42 is determined by the formula E=k2e; where: E is the height of the trapezoidal guide shroud 42, e is the height of the water outlet of the medium frequency induction furnace, and k2 is the coefficient of the trapezoidal guide shroud 42, with a value range of 1.4-1.8.

[0034] E = 1.4 × 800 mm = 1120 mm.

[0035] The dimensions of the furnace opening, water outlet, annular guide shroud, and trapezoidal guide shroud of the 3-ton medium-frequency induction furnace are shown in Table 1.

[0036] Table 1. Dimensions of Furnace Mouth, Water Outlet, Annular Shield, and Trapezoidal Shield for a 3-ton Medium Frequency Induction Furnace

[0037]

[0038] According to the dimensions in Table 1 above, when using a medium-frequency induction furnace flue gas collection device in a 3-ton medium-frequency induction furnace, no dust leakage occurred during the smelting and molten metal pouring stages, achieving zero dust emissions; at the end of the trapezoidal guide hood, the dust collection volume increased from the original 260kg / day to 310kg / day.

[0039] Through the above embodiments, it can be seen that the present invention has a significant effect on smoke and dust collection and removal, and improves the recovery rate of dust accumulated by-products of raw materials used in smelting. It can not only effectively improve the smelting working environment, but also improve the utilization rate of smelting materials and save production costs.

Claims

1. A flue gas collection device for a medium-frequency induction furnace, comprising a fume hood, the fume hood having a hollow structure, characterized in that: The bottom of the fume hood has a circular hole, inside which a furnace cover is installed. The furnace cover is circular, and connectors are provided around its perimeter. The furnace cover is fixedly connected to the top surface inside the fume hood via these connectors. The bottom surface of the furnace cover is at the same level as the bottom surface of the fume hood. An arc-shaped annular guide shroud is fixedly installed around the circular hole at the bottom of the fume hood. The rear end of the fume hood has a square opening communicating with the circular hole, and the rear end of the annular guide shroud has a notch corresponding to the square opening at the rear end of the fume hood. A guide assembly is connected to the rear end of the fume hood. The guide assembly includes a guide channel fixedly connected to the rear end of the fume hood, and the rear, bottom, and front surfaces of the guide channel are also included. The fume hood has a notch that connects to the opening at the rear of the fume hood. A trapezoidal guide hood is fixedly connected to the rear surface of the guide channel. The bottom of the trapezoidal guide hood has a notch that corresponds to the notch at the rear of the guide channel. The head of the fume hood is cylindrical. The right side is connected to the exhaust assembly via a rotating fixing component. The angle of the fume hood is adjusted via the rotating fixing component. Support components are connected to both the inner side of the exhaust assembly and the outer side of the fume hood. The support components fix the fume hood and the exhaust assembly on the upper surface of the medium-frequency induction furnace and enable the opening and closing of the fume hood and the exhaust assembly. The exhaust assembly is connected to the pipes of the purification system.

2. The flue gas collection device for a medium-frequency induction furnace according to claim 1, characterized in that: The smoke exhaust assembly includes a first smoke exhaust pipe, which is connected to a rotating and fixing assembly. A support assembly is fixedly connected to the left end of the first smoke exhaust pipe. The rear right end of the first smoke exhaust pipe is connected to a second smoke exhaust pipe. One end of the second smoke exhaust pipe is connected to the first smoke exhaust pipe, and the other end is connected to the left end of the third smoke exhaust pipe. The front right end of the third smoke exhaust pipe is connected to a fourth smoke exhaust pipe, and the fourth smoke exhaust pipe is connected to the pipes of the purification system.

3. The flue gas collection device for a medium-frequency induction furnace according to claim 2, characterized in that: The support assembly includes a support arm, one end of which is fixedly connected to the rear left side of the first exhaust pipe, and the other end is rotatably connected to a first support fixedly mounted on the upper surface of the medium-frequency induction furnace. A U-shaped support rod a is fixedly connected to the front left side of the first exhaust pipe, and the U-shaped support rod a is fixedly connected to the front end of a vertical support rod. A fume hood head support is fixedly mounted on the left side of the fume hood head, and the top of the vertical support rod is rotatably connected to the fume hood head support. A horizontal support rod is fixedly connected to the rear end of the vertical support rod, and a second support is rotatably connected to the rear end of the horizontal support rod. The second support is fixedly mounted on the upper surface of the medium-frequency induction furnace on the left side of the fume hood. A U-shaped support rod b is fixedly mounted on the lower left side of the first exhaust pipe, corresponding to the vertical support rod.

4. The flue gas collection device for a medium-frequency induction furnace according to claim 1, characterized in that: The diameter of the annular guide shroud is determined by the formula D=k1d, where: D is the diameter of the annular guide shroud; k1 is the diameter coefficient of the annular guide shroud, and the value of k1 ranges from 1.05 to 1.15; d is the diameter of the inlet of the medium-frequency induction furnace.

5. The flue gas collection device for a medium-frequency induction furnace according to claim 1, characterized in that: The length of the lower base of the trapezoidal guide shroud is determined by the formula A=k2a, the length of the upper base of the trapezoidal guide shroud is determined by the formula B=k2b, the width of the trapezoidal guide shroud is determined by the formula C=k2c, and the height of the trapezoidal guide shroud is determined by the formula E=k2e. In the formulas: A, B, C, and E correspond to the length of the lower base, the length of the upper base, the width, and the height of the trapezoidal guide shroud, respectively; a, b, c, and e correspond to the length of the lower base, the length of the upper base, the width, and the height of the outlet of the medium-frequency induction furnace, respectively; k2 is the trapezoidal guide shroud coefficient, and the value range of k2 is 1.4-1.

8.

6. The flue gas collection device for a medium-frequency induction furnace according to claim 1, characterized in that: The rotating fixing assembly includes two flanges, which are connected to the right side of the fume hood head and the left side of the first exhaust pipe, respectively. The inner sides of the two flanges are rotatably connected by a slewing bearing, and the flanges are fixed with locating pins.

7. The flue gas collection device for a medium-frequency induction furnace according to claim 1, characterized in that: The top of the smoke hood has a groove, and a handle is located at the front end of the top of the groove.

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