High-temperature-resistant frequency modulation radar level meter

Abstract

The invention discloses a high-temperature-resistant frequency modulation radar level meter, and particularly relates to the technical field of radar level meters, the high-temperature-resistant frequency modulation radar level meter comprises a radar level meter main body, a flange plate is arranged at the outer end of the radar level meter main body, the flange plate is mounted on a container, and a pressure-resistant heat insulation pipe is arranged at the bottom end of the flange plate; an antenna part of the radar level meter body extends downwards into the pressure-resistant heat insulation pipe, a conversion barrel is fixedly arranged at the bottom end of the pressure-resistant heat insulation pipe, a left end cover and a right end cover are arranged on the two sides of the conversion barrel respectively, and an external channel is fixedly arranged at the bottom end of the conversion barrel. The conversion cylinder is driven to rotate, the position of the communicating pipe is adjusted according to the temperature and pressure in the container, on the basis that high temperature and high pressure can be tolerated, the light and thin tempered glass plate is selected as much as possible, blocking of the tempered glass plate to pulses is reduced while the radar level meter body is protected, and the pulse efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of radar level meters, and in particular to a high temperature resistant frequency modulation radar level meter. Background Art

[0002] Radar level meter is a non-contact measuring instrument, which is mainly used to measure the height of liquid, slurry or granular materials inside the container. The antenna of the radar level meter transmits pulses to the material. The pulses are reflected after encountering the material and are received by the antenna. By calculating the time difference between transmission and reception and combining it with the propagation speed of electromagnetic waves, the level measurement can be achieved.

[0003] Radar level meters in the prior art often need to work in a high temperature and high pressure environment, and therefore need to have certain heat resistance and pressure resistance. For example, a high temperature and high pressure resistant frequency modulated continuous wave radar level meter mechanism with publication number CN207610754U in the prior art.

[0004] To resist high temperature and high pressure, the radar level meter needs to be isolated from the environment inside the container without affecting the measurement work of the radar level meter. Therefore, glass, ceramics and other materials are generally used as isolation structures in the prior art. While isolating the high temperature and high pressure, the pulse can also penetrate the isolation structure to work normally, such as a radar level meter resistant to high temperature and high pressure with publication number CN111307248B.

[0005] Materials such as glass and ceramics are not able to completely block pulses. Taking glass as an example, pulses have stronger penetration into glass than other materials such as metals, and this penetration gradually weakens as the thickness of the glass increases.

[0006] When used as an isolation structure, the thicker the glass, the better the effect of resisting high temperature and high pressure, but the weaker the pulse penetration effect. The thickness of the glass isolation structure in the prior art is fixed, and it is impossible to match isolation structures of different thicknesses according to the ambient temperature and pressure, and it is also impossible to maximize the working efficiency of the pulse while resisting high temperature and high pressure. Summary of the invention

[0007] The purpose of the present invention is to provide a high temperature resistant frequency modulation radar level meter. According to the temperature and pressure inside the container, the position of the connecting pipe is adjusted. On the basis of being able to withstand high temperature and high pressure, a light and thin tempered glass plate is selected as much as possible. While protecting the main body of the radar level meter, the blocking of the tempered glass plate to the pulse is reduced as much as possible, thereby improving the efficiency of the pulse.

[0008] In order to achieve the above object, the present invention provides the following technical solutions: a high temperature resistant frequency modulation radar level meter, comprising a radar level meter body, a flange is provided at the outer end of the radar level meter body, the flange is installed on a container, the structure above the flange is located outside the container, and the structure below the flange is located inside the container, a pressure-resistant heat-insulating pipe is provided at the bottom end of the flange, the antenna part of the radar level meter body extends downward into the pressure-resistant heat-insulating pipe, and a conversion cylinder is fixed at the bottom end of the pressure-resistant heat-insulating pipe;

[0009] A left end cover and a right end cover are respectively provided on both sides of the conversion cylinder, a conversion cylinder is provided inside the left end cover, the outer end of the conversion cylinder contacts the inner wall of the conversion cylinder, an external channel is fixedly provided at the bottom end of the conversion cylinder, six connecting tubes distributed in a ring array are fixedly provided on the inner wall of the conversion cylinder, the six connecting tubes are divided into three groups, each group has two connecting tubes, the two connecting tubes in the same group are symmetrically distributed about the axis center of the conversion cylinder, among the two connecting tubes in the same group, when one connecting tube is docked with the pressure-resistant heat-insulating tube, the other connecting tube is docked with the external channel, the number of connecting tubes in each group is two and remains unchanged, but the number of groups can be adjusted at will;

[0010] One group of connecting tubes is transparent from top to bottom, and no components are arranged on the inner wall of this group of connecting tubes. The other groups of connecting tubes are provided with tempered glass plates, which are arranged on the inner wall of one of the connecting tubes in the same group. The thickness of each tempered glass plate is different, and can withstand different degrees of temperature and pressure.

[0011] Furthermore, the opening of the conversion cylinder faces the left end cover, and two heat dissipation pipes with valves are fixedly provided on the left end cover. The heat dissipation pipes extend to the top of the flange, and the two heat dissipation pipes respectively input and output cooling air to the inside of the conversion cylinder;

[0012] A closed tube is fixed on the right end cover, a lower belt cover is fixed on one end of the closed tube, the lower belt cover can also isolate high temperature and withstand high pressure, an external shaft is provided inside the closed tube, the external shaft and the closed tube can be connected to each other by a sealed bearing, and one end of the external shaft is fixedly connected to the conversion cylinder.

[0013] Furthermore, a lower pulley is provided inside the lower belt cover, the other end of the external shaft extends into the lower belt cover and is fixedly connected to the lower pulley, the top end of the lower belt cover is connected to the bottom end of the flange, the lower belt cover and the flange are connected by bolts and can be disassembled and separated, and a connection port is provided on the flange;

[0014] An upper belt cover is provided at the top of the flange, and the upper belt cover and the lower belt cover are connected to each other through a connecting port. An upper belt pulley is provided inside the upper belt cover, and the upper belt pulley and the lower belt pulley are connected by a belt, and the belt can pass through the connecting port.

[0015] Furthermore, a driving rod is fixedly provided on the upper pulley, the driving rod extends to the outside of the upper belt cover and is fixedly provided with a handle, the driving rod is rotatably connected to the upper belt cover, and a fastening bolt is threadedly provided on the top of the upper belt cover;

[0016] A scale ring is fixedly provided on the side of the upper belt cover away from the radar level meter body, a protrusion for indicating the scale is provided on the handle, and an inspection cover is provided on the side of the upper belt cover facing the radar level meter body and on the side of the lower belt cover away from the conversion cylinder. The upper pulley and the lower pulley can be inspected by opening the inspection cover.

[0017] Furthermore, a switch assembly is provided on the rear side of the conversion cylinder, and the switch assembly includes an extension plate, a baffle is fixedly provided at the front end of the extension plate, and the top end of the baffle can contact the bottom end of the external channel when the external channel is closed, and the baffle has the function of blocking high temperature and resisting high pressure, and a protrusion is fixedly provided on the top end of the extension plate, and the protrusion is hinged to the rear side of the external channel.

[0018] Furthermore, a transfer arm is hinged at the rear end of the extension plate, the bottom end of the transfer arm is hinged to the extension plate, a sliding rod is hinged at the top end of the transfer arm, and a sleeve penetrating the flange is fixedly provided on the flange;

[0019] The top of the slide rod extends to the top of the flange through a sleeve, the inner wall of the sleeve contacts the outer end of the slide rod, a return spring is fixedly provided at the bottom end of the sleeve, the bottom end of the return spring is fixedly connected to the slide rod, the return spring is sleeved on the outer end of the slide rod, an annular protrusion is fixedly provided at the bottom end of the return spring, and the annular protrusion is fixed to the outer end of the slide rod.

[0020] Furthermore, a lifting rod is provided at the top of the sliding rod, a connecting plate is provided at the top of the lifting rod, one end of the connecting plate extends forward, a cylinder is provided at the top of the flange, the cylinder is located at the front side of the lifting rod, and the top of the cylinder contacts the bottom end of the connecting plate.

[0021] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0022] 1. By driving the conversion cylinder to rotate, adjust the position of the connecting pipe according to the temperature and pressure inside the container. On the basis of being able to withstand high temperature and high pressure, choose a thin tempered glass plate as much as possible to protect the main body of the radar level meter while reducing the blocking of the tempered glass plate to the pulse, thereby improving the efficiency of the pulse;

[0023] 2. The sliding rod is controlled to move up and down through the telescopic control of the connecting plate, thereby controlling the opening and closing of the baffle, so that the external channel is opened intermittently, and each opening lasts only 1 second. This makes the tempered glass plate only subjected to instantaneous high temperature and high pressure each time. The high temperature and high pressure will not last, and the impact on the tempered glass plate is small, which improves the tolerance of the tempered glass plate and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 This is a diagram of the closed state of the external channel of the present invention;

[0026] Figure 2 This is a diagram of the external channel opening state of the present invention;

[0027] Figure 3 It is a bottom view structural diagram of the present invention;

[0028] Figure 4 is a cross-sectional view of the present invention;

[0029] Figure 5 For the present invention Figure 4 Enlarged view of part A in the middle;

[0030] Figure 6 For the present invention Figure 4 Enlarged view of middle part B;

[0031] Figure 7 An exploded view of the conversion cylinder of the present invention;

[0032] Figure 8 This is a diagram showing the internal structure of the conversion cylinder of the present invention;

[0033] Fig. 9 It is the structural diagram of the upper and lower pulleys of the present invention;

[0034] Fig.10 It is a structural diagram of the switch assembly of the present invention.

[0035] Description of reference numerals:

[0036] 1. Radar level meter body; 2. Flange; 3. Conversion cylinder; 301. Left end cover; 302. Right end cover; 303. Connecting pipe; 304. Conversion cylinder; 305. Tempered glass plate; 306. External shaft; 307. Closed pipe; 4. External channel; 5. Switch assembly; 501. Baffle; 502. Extension plate; 503. Protrusion; 504. Transfer arm; 505. Sliding rod; 506. Sleeve; 507. Reset spring;

[0037] 6. Lower belt cover; 601. Upper pulley; 602. Belt; 603. Drive rod; 604. Lower pulley; 7. Upper belt cover; 8. Lifting rod; 9. Cylinder; 10. Connecting plate; 11. Heat dissipation duct; 12. Pressure-resistant insulation tube; 13. Connecting port; 14. Handle; 15. Scale ring. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] The present invention provides Figure 1-10 A high temperature resistant frequency modulation radar level meter is shown, comprising a radar level meter body 1, a flange 2 is provided at the outer end of the radar level meter body 1, the flange 2 is installed on a container, the structure above the flange 2 is located outside the container, and the structure below the flange 2 is located inside the container, a pressure-resistant heat-insulating tube 12 is provided at the bottom end of the flange 2, the antenna part of the radar level meter body 1 extends downward into the pressure-resistant heat-insulating tube 12, and a conversion cylinder 3 is fixed at the bottom end of the pressure-resistant heat-insulating tube 12;

[0040] The conversion cylinder 3 is provided with a left end cover 301 and a right end cover 302 on both sides, and a conversion cylinder 304 is provided inside the left end cover 301. The outer end of the conversion cylinder 304 contacts the inner wall of the conversion cylinder 3. An external channel 4 is fixedly provided at the bottom of the conversion cylinder 3. Six connecting tubes 303 distributed in a ring array are fixedly provided on the inner wall of the conversion cylinder 304. The six connecting tubes 303 are divided into three groups, each group has two connecting tubes. The two connecting tubes 303 in the same group are symmetrically distributed about the axis center of the conversion cylinder 304. Among the two connecting tubes 303 in the same group, when one connecting tube 303 is connected to the pressure-resistant heat-insulating tube 12, the other connecting tube 303 is connected to the external channel 4. The number of connecting tubes in each group is two, which remains unchanged, but the number of groups can be adjusted by itself.

[0041] One group of connecting tubes 303 is transparent from top to bottom, and no components are provided on the inner wall of this group of connecting tubes 303. The other groups of connecting tubes 303 are provided with tempered glass plates 305, which are provided on the inner wall of one of the connecting tubes 303 in the same group, and the thickness of each tempered glass plate 305 is different.

[0042] The flange 2 is installed and fixed in the container. The pressure-resistant heat-insulating tube 12 and the conversion cylinder 3 under the flange 2 are both inserted into the container. The antenna part of the lower half of the radar level meter body 1 is enclosed in the pressure-resistant heat-insulating tube 12, so that it can be isolated from the high temperature and high pressure in the container. During operation, the conversion cylinder 304 is driven to rotate inside the conversion cylinder 3, driving the connecting tube 303 to rotate, and then adjusting the position of each pair of connecting tubes 303. The tempered glass plates 305 corresponding to different connecting tubes 303 have different thicknesses and can withstand different temperatures and pressures. Therefore, the corresponding tempered glass plate 305 and the connecting tube 303 corresponding to the tempered glass plate 305 are selected according to the temperature and pressure inside the container. The selected tempered glass plate 305 is as light and thin as possible under the premise of being able to withstand the high temperature and high pressure in the container.

[0043] The connecting tube 303 with the tempered glass plate 305 fixed in the corresponding group of connecting tubes 303 is rotated to the external channel 4, and the other connecting tube 303 is located at the pressure-resistant heat-insulating tube 12. At this time, the pulse emitted by the antenna of the radar level meter body 1 can enter the conversion cylinder 3 along the pressure-resistant heat-insulating tube 12 and pass through the pair of connecting tubes 303, penetrate the corresponding tempered glass plate 305, and finally enter the container downward through the external channel 4. The reflected pulse can also return along the original path. On the basis of protecting the radar level meter body 1 from the influence of high temperature and high pressure, the blocking of the pulse by the tempered glass plate 305 is reduced as much as possible, thereby improving the efficiency of the pulse.

[0044] Although the pressure-resistant heat-insulated pipe 12 and the conversion cylinder 3 can isolate part of the heat, it is still necessary to cool the inside of the pressure-resistant heat-insulated pipe 12 when necessary, such as Figure 2 , 4 As shown in FIG. 7 , the opening of the conversion cylinder 304 faces the left end cover 301, and two heat dissipation pipes 11 with valves are fixedly provided on the left end cover 301. The heat dissipation pipes 11 extend to the top of the flange 2, and the two heat dissipation pipes 11 input and output cooling air to the inside of the conversion cylinder 3 respectively;

[0045] Cooling air is input into the conversion cylinder 3 and the pressure-resistant heat-insulating tube 12 through one of the heat dissipation pipes 11. The cooling air entering therein can reach the inside of the conversion cylinder 304 and the pressure-resistant heat-insulating tube 12. The cooling air after absorbing the heat is finally discharged to the outside through the other heat dissipation pipe 11, thereby achieving the purpose of heat dissipation and effectively reducing the influence of heat on the radar level meter body 1.

[0046] The rotation of the conversion cylinder 304 is adjusted manually as required, such as Figure 4 , 6As shown in FIG. 9 , a closed tube 307 is fixedly provided on the right end cover 302, and a lower belt cover 6 is fixedly provided at one end of the closed tube 307. The lower belt cover 6 can also isolate high temperature and withstand high pressure. An external shaft 306 is provided inside the closed tube 307. The external shaft 306 and the closed tube 307 can be connected to each other by a sealed bearing, and one end of the external shaft 306 is fixedly connected to the conversion cylinder 304.

[0047] A lower pulley 604 is provided inside the lower belt cover 6, the other end of the circumscribed shaft 306 extends into the lower belt cover 6 and is fixedly connected to the lower pulley 604, the top of the lower belt cover 6 is connected to the bottom of the flange 2, the lower belt cover 6 and the flange 2 are connected by bolts and can be disassembled and separated, and a connection port 13 is provided on the flange 2;

[0048] By driving the lower pulley 604 to rotate, the external shaft 306 can be driven. One end of the conversion cylinder 304 is open and the other end is closed. The closed end is fixedly connected to the external shaft 306. Therefore, after the external shaft 306 rotates, it can drive the conversion cylinder 304 to control its rotation. The lower pulley 604 is protected by the lower belt cover 6 and is not affected by high temperature and high pressure.

[0049] According to the external scale indication, the rotation angle of the lower pulley 604 and the conversion cylinder 304 can be controlled, and different tempered glass plates 305 can be selected, such as Figure 1 , 4 As shown in , 5, an upper belt cover 7 is provided on the top of the flange 2, and the upper belt cover 7 and the lower belt cover 6 are connected to each other through a connecting port 13. An upper pulley 601 is provided inside the upper belt cover 7, and the upper pulley 601 and the lower pulley 604 are connected by a belt 602, and the belt 602 can pass through the connecting port 13.

[0050] A driving rod 603 is fixedly disposed on the upper pulley 601, and the driving rod 603 extends to the outside of the upper belt cover 7 and is fixedly disposed with a handle 14, the driving rod 603 is rotatably connected to the upper belt cover 7, and a fastening bolt is threadedly disposed at the top of the upper belt cover 7;

[0051] A scale ring 15 is fixedly provided on the side of the upper belt cover 7 away from the radar level meter body 1, and a protrusion for indicating the scale is provided on the handle 14. Inspection covers are provided on the side of the upper belt cover 7 facing the radar level meter body 1 and on the side of the lower belt cover 6 away from the conversion cylinder 3. The upper pulley 601 and the lower pulley 604 can be inspected by opening the inspection covers.

[0052] On the outside of the container, manually rotating the handle 14 can drive the driving rod 603, thereby controlling the rotation of the upper pulley 601, and the upper pulley 601 drives the lower pulley 604 to rotate through the belt 602. During the rotation of the handle 14, the protrusion on the handle 14 can indicate the scale on the scale ring 15 corresponding to the rotation of the handle 14, and then the rotation angle of the upper pulley 601 and the lower pulley 604 can be understood, thereby controlling the rotation angle of the conversion cylinder 304, and finally controlling and selecting different tempered glass plates 305.

[0053] The destructive force of instantaneous high temperature and high pressure is smaller than that of long-term high temperature and high pressure, such as Figure 2 , 3 As shown in Figure 10, a switch assembly 5 is provided at the rear side of the conversion cylinder 3, and the switch assembly 5 includes an extension plate 502. A baffle 501 is fixedly provided at the front end of the extension plate 502. The top end of the baffle 501 can contact with the bottom end of the external channel 4 when the external channel 4 is closed. The baffle 501 has the function of blocking high temperature and resisting high pressure. A protrusion 503 is fixedly provided at the top end of the extension plate 502, and the protrusion 503 is hinged to the rear side of the external channel 4.

[0054] The rear end of the extension plate 502 is hinged with a transfer arm 504, the bottom end of the transfer arm 504 is hinged with the extension plate 502, the top end of the transfer arm 504 is hinged with a slide bar 505, and the flange 2 is fixed with a sleeve 506 that penetrates the flange 2;

[0055] Theoretically, the pulse emitted by the radar level meter body 1 propagates at the speed of light. Each time a measurement is made, the time for the pulse to go back and forth is extremely short, and a measurement is completed almost in an instant. Therefore, the baffle 501 can be controlled to open and close by sliding the slide bar 505 up and down relative to the sleeve 506. When the slide bar 505 moves upward, the transfer arm 504 is pulled to move upward and the rear end of the extension plate 502 is driven to move upward. The extension plate 502 rotates with the protrusion 503 as a fulcrum, driving the baffle 501 to rotate downward, so that the external channel 4 is opened. Conversely, when the slide bar 505 moves downward, it will push the transfer arm 504 and the extension plate 502, so that the baffle 501 rotates upward and is in close contact with the external channel 4, thereby closing the external channel 4.

[0056] By controlling the slide bar 505 to reciprocate up and down once within 1 second, the baffle 501 can be controlled to open and close once within 1 second. The pulse propagates at the speed of light, and 1 second is sufficient to complete a detection. Therefore, each time the baffle 501 is opened and closed, the radar level meter body 1 can complete a detection. In this way, the baffle 501 is controlled to be opened intermittently, and is only opened for 1 second each time. During the rest of the time, the baffle 501 closes the external channel 4, so that the radar level meter body 1 is completely unaffected by high temperature and high pressure. The opening time of 1 second each time is relatively short, so that the tempered glass plate 305 directly above the external channel 4 is only subjected to instantaneous high temperature and high pressure each time, and the high temperature and high pressure will not last, and the impact on the tempered glass plate 305 is relatively small, which improves the tolerance of the tempered glass plate 305 and prolongs its service life. This detection method is suitable for the situation where the position of the material inside the container changes relatively slowly, and can only be detected intermittently, and cannot be detected in real time.

[0057] In order to control the sliding bar 505 to move up and down, Figure 1 , 2 As shown in , 3, and 10, the top end of the slide rod 505 extends to the top of the flange 2 through the sleeve 506, and the inner wall of the sleeve 506 contacts the outer end of the slide rod 505. A return spring 507 is fixedly provided at the bottom end of the sleeve 506. The bottom end of the return spring 507 is fixedly connected to the slide rod 505. The return spring 507 is sleeved on the outer end of the slide rod 505. The bottom end of the return spring 507 is fixedly provided with an annular protrusion, which is fixed to the outer end of the slide rod 505.

[0058] A lifting rod 8 is provided at the top of the sliding rod 505, and a connecting plate 10 is provided at the top of the lifting rod 8. One end of the connecting plate 10 extends forward. A cylinder 9 is provided at the top of the flange 2. The cylinder 9 is located on the front side of the lifting rod 8, and the top of the cylinder 9 contacts the bottom end of the connecting plate 10.

[0059] When the control slide bar 505 moves upward, the piston rod of the cylinder 9 extends upward, pushing the connecting plate 10 to move upward, and the connecting plate 10 pulls the lifting rod 8 and drives the slide bar 505 to move upward along the sleeve 506, and the upward movement of the slide bar 505 causes the return spring 507 to be compressed. When the slide bar 505 needs to move down and return to its original position, the piston rod of the connecting plate 10 contracts downward, and the slide bar 505 loses the upward pulling force. Subsequently, the elastic force of the return spring 507 is released, pushing the slide bar 505 to move downward.

[0060] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high temperature resistant frequency modulation radar level meter, comprising a radar level meter body (1), wherein the outer end of the radar level meter body (1) is provided with a flange (2), characterized in that: A pressure-resistant heat-insulating pipe (12) is provided at the bottom end of the flange (2), and a conversion cylinder (3) is fixedly provided at the bottom end of the pressure-resistant heat-insulating pipe (12); A left end cover (301) and a right end cover (302) are respectively provided on both sides of the conversion cylinder (3); a conversion cylinder (304) is provided inside the left end cover (301); the outer end of the conversion cylinder (304) contacts the inner wall of the conversion cylinder (3); an external connection channel (4) is fixedly provided at the bottom end of the conversion cylinder (3); six connecting tubes (303) distributed in a ring array are fixedly provided on the inner wall of the conversion cylinder (304); the six connecting tubes (303) are divided into three groups, each group having two connecting tubes, and the two connecting tubes (303) in the same group are symmetrically distributed about the axis center of the conversion cylinder (304); The interior of one group of connecting tubes (303) is transparent from top to bottom, and each of the other groups of connecting tubes (303) is provided with a tempered glass plate (305). The tempered glass plate (305) is arranged on the inner wall of one of the connecting tubes (303) in the same group of connecting tubes (303), and the thickness of each tempered glass plate (305) is different.

2. The high temperature resistant frequency modulated radar level meter according to claim 1, characterized in that: The opening of the conversion cylinder (304) faces the left end cover (301), and two heat dissipation pipes (11) with valves are fixedly provided on the left end cover (301), and the heat dissipation pipes (11) extend to the top of the flange (2); A closed tube (307) is fixedly provided on the right end cover (302), a lower belt cover (6) is fixedly provided on one end of the closed tube (307), an external shaft (306) is provided inside the closed tube (307), and one end of the external shaft (306) is fixedly connected to the conversion cylinder (304).

3. A high temperature resistant frequency modulated radar level meter according to claim 2, characterized in that: A lower pulley (604) is provided inside the lower belt cover (6), the other end of the external shaft (306) extends into the lower belt cover (6) and is fixedly connected to the lower pulley (604), the top end of the lower belt cover (6) is connected to the bottom end of the flange (2), and a connecting port (13) is provided on the flange (2); An upper belt cover (7) is provided at the top of the flange (2); the upper belt cover (7) and the lower belt cover (6) are connected to each other via a connecting port (13); an upper belt pulley (601) is provided inside the upper belt cover (7); the upper belt pulley (601) and the lower belt pulley (604) are connected via a belt (602).

4. The high temperature resistant frequency modulated radar level meter according to claim 3, characterized in that: A driving rod (603) is fixedly provided on the upper belt pulley (601), and the driving rod (603) extends to the outside of the upper belt cover (7) and is fixedly provided with a handle (14), and a fastening bolt is threadedly provided at the top end of the upper belt cover (7); A scale ring (15) is fixedly provided on the side of the upper belt cover (7) away from the radar level meter body (1), and an inspection cover is provided on the side of the upper belt cover (7) facing the radar level meter body (1) and on the side of the lower belt cover (6) away from the conversion cylinder (3).

5. The high temperature resistant frequency modulated radar level meter according to claim 1, characterized in that: A switch assembly (5) is provided at the rear side of the conversion cylinder (3), and the switch assembly (5) comprises an extension plate (502), a baffle (501) is fixedly provided at the front end of the extension plate (502), and the top end of the baffle (501) can contact the bottom end of the external channel (4) when the external channel (4) is closed, and a protrusion (503) is fixedly provided at the top end of the extension plate (502), and the protrusion (503) is hinged to the rear side of the external channel (4).

6. The high temperature resistant frequency modulated radar level meter according to claim 5, characterized in that: The rear end of the extension plate (502) is hinged with a transfer arm (504), the top end of the transfer arm (504) is hinged with a slide rod (505), and a sleeve (506) penetrating the flange (2) is fixedly provided on the flange (2); The top end of the slide bar (505) extends to the top of the flange (2) through the sleeve (506), and a return spring (507) is fixedly provided at the bottom end of the sleeve (506), and the bottom end of the return spring (507) is fixedly connected to the slide bar (505).

7. The high temperature resistant frequency modulated radar level meter according to claim 5, characterized in that: A lifting rod (8) is provided at the top of the sliding rod (505), a connecting plate (10) is provided at the top of the lifting rod (8), a cylinder (9) is provided at the top of the flange (2), the cylinder (9) is located at the front side of the lifting rod (8), and the top of the cylinder (9) is in contact with the bottom end of the connecting plate (10).

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