A radar automatic detection device and system for the liquid level height of a molten iron tank

Abstract

The present invention discloses a radar automatic detection device for the liquid level height of a molten iron tank, comprising a radome composed of an outer wall and an inner wall, a cavity interlayer is arranged between the outer wall and the inner wall, the inner wall encloses an inner cavity, a radar level meter is arranged in the inner cavity; an air inlet pipe is arranged on the outer side of the radome, and the air outlet end of the air inlet pipe is connected with the cavity interlayer and the inner cavity. The radar automatic detection device for the liquid level height of a molten iron tank provided by the present invention adopts a radar level meter to measure the liquid level height of the molten iron in the molten iron tank. Compared with manual visual inspection, the radar level meter is safe and accurate in measuring the liquid level height; the radome structure with a double-layer hollow structure delivers high-pressure cold air through the air inlet pipe, and simultaneously and continuously blows and cools the inner cavity and the cavity interlayer of the radome, effectively reducing the working temperature around the radar and extending the service life of the radar level meter.

Description

Technical Field

[0001] The invention relates to the technical field of steel smelting, and in particular to a radar automatic detection device for the liquid level height of a molten iron tank. Background Art

[0002] In the ironmaking process, molten iron (temperature up to 1500℃ or above) needs to be diverted from the blast furnace into a ladle and then transported to the subsequent process stations. The traditional process is to manually observe from above the ladle with the naked eye whether the molten iron is full and when it is full.

[0003] The more advanced technology now uses radar to detect the liquid level of molten iron from above the molten iron tank by emitting radar waves to the molten iron tank, and feeds back the liquid level information to the corresponding command and control personnel. Due to the harsh working environment, high temperature and high dust, the molten iron temperature is as high as 1500℃, resulting in the surrounding air temperature generally reaching above 80℃. In addition, due to the presence of slag, there will be a high amount of dust around. These harsh working conditions have affected the life and stability of the current liquid measurement radar. Summary of the invention

[0004] Based on the above problems, the purpose of the present invention is to provide a radar automatic detection device for the liquid level height of a molten iron tank, which mainly uses radar to replace manual visual observation, and optimizes the specific structure of the radar cover. Through heat insulation and cooling measures, the working environment temperature and dust around the radar are reduced, thereby improving the service life and stability of the radar.

[0005] The present invention adopts the following technical solution:

[0006] The present invention provides a radar automatic detection device for the liquid level of a molten iron tank, comprising a radar cover composed of an outer wall and an inner wall, a cavity interlayer is arranged between the outer wall and the inner wall, the inner wall is enclosed to form an inner cavity, and a radar level meter is arranged in the inner cavity;

[0007] An air inlet pipe is arranged on the outer side of the radome, and an air outlet end of the air inlet pipe is communicated with the cavity interlayer and the inner cavity.

[0008] Furthermore, the radar level meter includes a radar body and a mounting flange;

[0009] The antenna end at the lower part of the radar body passes through the reserved opening at the bottom of the radome and then extends into the lower protective cover. A gap for ventilation and air conduction is left between the radar body and the outer edge of the reserved opening. The lower protective cover is fixed to the bottom surface of the radome.

[0010] The mounting flange is fixed to the bottom of the inner cavity, a plurality of first ventilation holes are arranged on the mounting flange, a plurality of second ventilation holes are arranged in the area of ​​the inner wall corresponding to the mounting flange, and the second ventilation holes are connected to the first ventilation holes one by one.

[0011] Furthermore, a heat-insulating glass is provided at the bottom of the lower shield.

[0012] Furthermore, a plurality of air outlet holes are provided on the side wall of the lower protective cover.

[0013] Furthermore, a gas purge pipe is provided obliquely below the heat-insulating glass.

[0014] Furthermore, the gas purge pipe and the air inlet pipe are both connected to the gas supply main pipe.

[0015] Furthermore, the radome is a concave-shaped structure, and a top cover is provided at the top opening of the radome.

[0016] Furthermore, both sides of the upper part of the radome are fixed to the bottom surface of the second floor slab through connecting seats.

[0017] Furthermore, the connecting seat is an angle steel, and an adjustment hole for adjusting the installation position of the radome is provided on the connecting seat.

[0018] The present invention also provides a molten iron tank liquid level height automatic radar detection system, comprising the molten iron tank liquid level height automatic radar detection device.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are:

[0020] The automatic radar detection device for the liquid level height of a molten iron tank provided by the present invention adopts a radar level meter to measure the liquid level height of the molten iron in the molten iron tank. Compared with manual visual inspection, the radar level meter is safe and accurate in measuring the liquid level height; the double-layer hollow radome structure transmits high-pressure cold air through an air inlet pipe, and simultaneously and continuously blows and cools the inner cavity and the cavity interlayer of the radome, effectively reducing the working temperature around the radar and extending the service life of the radar level meter; the lower shield at the bottom of the radome can protect the antenna structure at the bottom of the radar, and the cold air in the inner cavity and the cavity interlayer can flow into the lower shield to cool the antenna structure at the bottom of the radar; the heat-insulating glass at the bottom of the lower shield can effectively isolate the high-temperature gas and dust generated by the molten iron, and cooperates with the gas purge pipe at the bottom to blow away and cool the dust attached to the bottom of the heat-insulating glass, so that the radar can always be at a relatively reasonable working temperature and visibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of the automatic radar detection device for the liquid level height of a molten iron tank in the first embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the gas connection between the inner cavity, the cavity interlayer and the lower shield in the first embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the installation of the radome in the first embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the connecting socket in the first embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the automatic radar detection system for the liquid level height of the molten iron tank in the second embodiment of the present invention.

[0027] Explanation of the reference numerals: 1. Radar cover; 101. Outer wall; 102. Inner wall; 2. Cavity interlayer; 3. Inner cavity; 4. Radar level meter; 401. Radar body; 402. Mounting flange; 5. Air inlet pipe; 6. Reserved opening; 7. Lower protective cover; 8. Gap; 9. First ventilation hole; 10. Second ventilation hole; 11. Insulating glass; 12. Air outlet; 13. Gas purge pipe; 14. Gas supply main; 15. Top cover; 16. Connecting seat; 1601. Adjustment hole; 18. Molten iron ladle; 19. Ground. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Embodiment 1

[0030] like Figure 1 and 2 As shown, in this embodiment, a radar automatic detection device for the liquid level height of a molten iron tank is disclosed, comprising a radome 1, wherein an inner cavity 3 is provided in the radome 1, and a radar level meter 4 is installed in the inner cavity 3. The radome 1 is composed of an outer wall 101 and an inner wall 102, and a cavity interlayer 2 is provided between the outer wall 101 and the inner wall 102. An air inlet pipe 5 is provided on the outside of the radome 1, and the air outlet end of the air inlet pipe 5 is connected with the cavity interlayer 2 and the inner cavity 3.

[0031] The most significant feature of this structure is that it uses a double-layer hollow radome structure, delivers high-pressure cold air through the air inlet pipe 5, and performs continuous air blowing cooling on the inner cavity 3 and the cavity interlayer 2 of the radome at the same time, thereby reducing the operating temperature around the radar; at the same time, the radome 1 can also prevent dust from adhering to the radar.

[0032] In this embodiment, the radar cover 1 is a concave structure, and a top cover 15 is installed at the top opening of the radar cover 1 by bolts. The radar level meter 4 in the inner cavity 3 can be inspected and maintained by removing the top cover 15.

[0033] In the prior art, the structure of the radar level meter 4 generally includes a radar body 401 and a mounting flange 402. The lower part of the radar body 401 is an antenna structure. In this embodiment, the antenna end of the lower part of the radar body 401 extends to the outside of the radar cover 1. Specifically, a reserved opening 6 is provided at the bottom of the radar cover 1, and the antenna end of the lower part of the radar body 401 passes through the reserved opening 6 and extends to the outside of the radar cover 1.

[0034] In order to protect the antenna structure at the bottom of the radar body 401 , a lower shield 7 is arranged around the radar antenna structure. The lower shield 7 is welded to the bottom surface of the outer wall 101 of the radar cover 1 .

[0035] It should be noted that since the radome 1 has a double-wall structure, when opening the reserved opening 6, the reserved opening 6 needs to be opened on both the outer wall 101 and the inner wall 102 at the same time, so that the antenna end at the lower part of the radar body 401 can pass through the reserved opening 6 to the outside of the radome 1.

[0036] In order to introduce the cold air in the cavity interlayer 2 into the lower protective cover 7, a gap 8 for ventilation and air guidance is left between the radar body 401 and the outer edge of the reserved opening 6. The cold air in the cavity interlayer 2 enters the lower protective cover 7 through the gap 8 to cool down the antenna structure at the bottom of the radar.

[0037] The mounting flange 402 is fixed to the bottom of the inner cavity 3, specifically, it is fixed to the inner wall 102 of the radome 1 by bolts. In order to circulate the high-pressure cold air in the inner cavity 3, the high-pressure cold air in the inner cavity 3 needs to be led out of the radome 1. As a possible implementation method, in this embodiment, a plurality of first ventilation holes 9 are provided on the mounting flange 402, and a plurality of second ventilation holes 10 are provided in the area of ​​the inner wall 102 corresponding to the mounting flange 402, and the second ventilation holes 10 are connected to each of the first ventilation holes 9 in a one-to-one correspondence.

[0038] The high-pressure cold air in the inner cavity 3 enters into the cavity interlayer 2 through the first ventilation hole 9 and the second ventilation hole 10, merges with the high-pressure air in the cavity interlayer 2, and finally enters into the lower shield 7 through the gap 8. The first ventilation holes 9 are distributed around the radar body 401, and can effectively carry away the heat around the radar body 401.

[0039] The lower shield 7 is a structure with an opening at the bottom. In order to prevent dust and high temperature from affecting the operation of the radar antenna, a heat-insulating glass 11 is provided at the bottom of the lower shield 7. The heat-insulating glass 11 is fixed in the central circular hole of the flange ring, and the flange ring is fixed to the lower shield 7 by bolts.

[0040] The setting of the insulating glass 11 can effectively protect the radar antenna from dust, but it also affects the discharge of high-pressure gas in the lower shield 7. In order to discharge the high-pressure gas in the lower shield 7 to the outside, a plurality of air outlets 12 are opened on the side wall of the lower shield 7.

[0041] After long-term use, a large amount of dust will adhere to the lower surface of the insulating glass 11. In order to remove the dust on the lower surface of the insulating glass 11, a gas purge pipe 13 is arranged obliquely below the insulating glass 11. After the high-pressure gas passes through the gas purge pipe 13, the dust attached to the bottom of the insulating glass 11 is blown away and the temperature is reduced.

[0042] In this embodiment, the gas purge pipe 13 and the air intake pipe 5 are both connected to the gas supply main pipe 14 .

[0043] like Figure 3 As shown, the radome 1 of the present invention is inverted and installed under the second floor slab 17. Specifically, connecting seats 16 are provided on both sides of the upper part of the radome 1, and the radome 1 is fixed to the bottom surface of the second floor slab 17 through the connecting seats 16.

[0044] The radar cover 1 is directly above the molten iron tank 18, and can effectively monitor the molten iron liquid level in real time. This structure is installed upside down under the floor slab, which does not affect the operation and movement of personnel on the second floor at all, and does not open holes on the floor slab. It not only reduces the difficulty of construction and reduces damage to the floor slab, but more importantly, it can effectively reduce the impact of molten iron heat radiation on the second floor.

[0045] In this embodiment, if Figure 4 As shown, the connection seat 16 is an angle steel, and an adjustment hole 1601 is provided on the connection seat 16 for adjusting the installation position of the radome 1. The adjustment hole 1601 on the horizontal part of the angle steel is perpendicular to the length direction, and is used to adjust the distance between the two connection seats 16 and the left and right installation positions. The adjustment hole 1601 on the vertical part of the angle steel is parallel to the length direction, and is used to adjust the front and rear installation positions of the radome 1.

[0046] Embodiment 2

[0047] Based on the automatic radar detection device for the liquid level height of the molten iron tank in the first embodiment, this embodiment provides an automatic radar detection system for the liquid level height of the molten iron tank, including the automatic radar detection device for the liquid level height of the molten iron tank in the first embodiment.

[0048] like Figure 5 As shown, the system also includes an industrial computer, a network switch, a PLC controller, a large display screen, an alarm, an alarm off button, an air source switch button and a solenoid valve.

[0049] The industrial computer is electrically connected to the network switch, which can be connected to multiple plc controllers, each plc controller can be electrically connected to multiple alarms, and the AI ​​module of the plc controller is electrically connected to multiple radar level meters 4. The radar level meter 4 outputs a signal to the controller (plc controller, industrial computer), and the control converts the signal into a four-digit effective number representing the liquid level through A / D conversion, and displays it on the display screen. The radar level meter 4 monitors the liquid level in the molten iron tank at all times. When it exceeds the set value, the alarm corresponding to the radar level meter 4 sounds an alarm, and the control personnel control the stop of injecting molten iron into the molten iron tank.

[0050] The solenoid valve is installed on the gas source passage, specifically on the gas supply main pipe 14. The solenoid valve is electrically connected to the gas source switch button, and the gas source switch button controls the connection or disconnection of the gas source passage by controlling the connection and disconnection of the solenoid valve. The gas supply pipe performs continuous air blowing cooling on the inner cavity and the hollow interlayer chamber of the radar cover respectively to reduce the working temperature around the radar. Since the inner cavity of the radar cover is in a positive pressure state of inflation and a certain air blowing flow rate is always maintained, it can reduce both temperature and dust. In conjunction with the bottom glass purge port, the radar can always be kept at a relatively reasonable working temperature and visibility.

[0051] This system can not only accurately measure the liquid level of the molten iron tank, but also conveniently and timely notify the operator, and can provide liquid level alarm and on-site cooling gas shutdown functions.

[0052] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A radar automatic detection device for the liquid level of a molten iron tank, characterized in that: The invention comprises a radar cover (1) composed of an outer wall (101) and an inner wall (102), a cavity interlayer (2) is arranged between the outer wall (101) and the inner wall (102), the inner wall (102) encloses an inner cavity (3), and a radar level meter (4) is arranged in the inner cavity (3); An air inlet pipe (5) is arranged on the outside of the radome (1), and an air outlet end of the air inlet pipe (5) is in communication with the cavity interlayer (2) and the inner cavity (3); The radar level meter (4) comprises a radar body (401) and a mounting flange (402); The antenna end at the lower part of the radar body (401) passes through the reserved opening (6) at the bottom of the radar cover (1) and then extends into the lower protective cover (7); a gap (8) for ventilation and air conduction is left between the radar body (401) and the outer edge of the reserved opening (6); and the lower protective cover (7) is fixed to the bottom surface of the radar cover (1); The mounting flange (402) is fixed to the bottom of the inner cavity (3), a plurality of first ventilation holes (9) are arranged on the mounting flange (402), a plurality of second ventilation holes (10) are arranged in an area of ​​the inner wall (102) corresponding to the mounting flange (402), and the second ventilation holes (10) are connected to the first ventilation holes (9) in a one-to-one correspondence; The bottom of the lower shield (7) is provided with heat-insulating glass (11); A plurality of air outlet holes (12) are provided on the side wall of the lower protective cover (7); A gas purge pipe (13) is provided obliquely below the heat-insulating glass (11); The gas purge pipe (13) and the air inlet pipe (5) are both connected to the gas supply main pipe (14).

2. The automatic radar detection device for the liquid level of the molten iron tank according to claim 1 is characterized in that: The radome (1) is a concave-shaped structure, and a top cover (15) is provided at the top opening of the radome (1).

3. The automatic radar detection device for the liquid level of the molten iron tank according to claim 1 is characterized in that: Both sides of the upper part of the radome (1) are fixed to the bottom surface of the second floor slab (17) via connecting seats (16).

4. The automatic radar detection device for the liquid level of the molten iron tank according to claim 3 is characterized in that: The connection seat (16) is an angle steel, and an adjustment hole (1601) for adjusting the installation position of the radome (1) is provided on the connection seat (16).

5. A radar automatic detection system for the liquid level of a molten iron tank, characterized in that: It comprises the automatic radar detection device for the liquid level height of the molten iron tank as described in any one of claims 1 to 4 above.

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