A level gauge for hazardous chemical storage tanks

Abstract

This invention provides a level gauge for hazardous chemical storage tanks, relating to the technical field of level measurement equipment. It includes a measuring mounting component with a drive control component mounted on it. The drive control component controls and isolates the measured liquid level. A sealing control component is mounted at the bottom of the measuring mounting component, protecting it. A safety ventilation component is mounted on the measuring mounting component to prevent moisture absorption. A heating guide component is mounted at the bottom of the measuring mounting component. The use of a drive control component in conjunction with the sealing control component facilitates the sealing of the level gauge body, preventing corrosion of the probe at the bottom of the level gauge body by volatile gases when not measuring, thus extending the service life of the level gauge body. This solves the problem that current level gauges for hazardous chemical storage tanks are not convenient for automatic control of sealing and protection after level measurement, and also lack the convenience of auxiliary ventilation to release small amounts of residual volatile gases.

Description

Technical Field

[0001] This invention relates to the field of liquid level measurement equipment technology, and in particular to a liquid level gauge for hazardous chemical storage tanks. Background Technology

[0002] In actual hazardous chemical storage tanks, such as oil storage tanks, accurate information on the internal oil level is crucial for replenishment and other operations. Since oil is volatile and classified as a hazardous chemical, non-contact level gauges such as ultrasonic or radar are typically used for level measurement. However, current level gauges for hazardous chemical storage tanks are usually permanently installed on the tank, making quick disassembly and maintenance difficult. Direct disassembly can lead to volatile gas leaks, and prolonged exposure to volatile gases can shorten the gauge's lifespan. Furthermore, automatic sealing and protection after level measurement are not readily available, and auxiliary ventilation to remove residual volatile gases is also inconvenient, resulting in safety concerns. Additionally, level gauge probes are prone to condensation, further affecting measurement accuracy. Moreover, in low-temperature scenarios such as winter, highly viscous oils like crude oil can create depressions after discharge, often requiring heating to increase fluidity and maintain a smooth surface. Temperature control alone is insufficient to ensure accurate readings, and manual measurement before the oil has fully warmed up can compromise accuracy. Summary of the Invention

[0003] This disclosure relates to a level gauge for hazardous chemical storage tanks, which solves the problems of current level gauges for hazardous chemical storage tanks being inconvenient to automatically control the sealing and protection after the level measurement is completed, and also inconvenient to assist ventilation to release a small amount of residual volatile gas.

[0004] In a first aspect, this disclosure provides a level gauge for a hazardous chemical storage tank, specifically including a measuring mounting component. A drive control component is mounted on the measuring mounting component; the drive control component is used to control and isolate the measured liquid level; a sealing control component is mounted at the bottom of the measuring mounting component; the sealing control component is used to protect the measuring mounting component; a safety ventilation component is mounted on the measuring mounting component; the safety ventilation component is used to prevent the measuring mounting component from getting damp; a heating guide component is mounted at the bottom of the measuring mounting component; a temperature control fuse component is mounted on the heating guide component; the temperature control fuse component is used to detect the flowability of the stored liquid; the measuring mounting component includes: a measuring mounting cover and a level gauge body, the level gauge body being fixedly mounted on the measuring mounting cover by bolts; the end of the level gauge body is located inside the measuring mounting cover; the bottom of the measuring mounting cover has a flange for mounting on the storage tank.

[0005] In at least some embodiments, the measuring installation includes: an air inlet pipe and a bend, the air inlet pipe being threadedly connected to a flange on the level gauge body; a one-way valve being provided on the air inlet pipe; a bend being fixedly installed on the top of the air inlet pipe; and the bend being used for waterproofing.

[0006] In at least some embodiments, the drive control component includes: a drive mounting cover, a drive motor, a limit stop, and a swing arm. The drive mounting cover is fixedly mounted on the side of the measuring mounting cover; the drive motor is fixedly mounted inside the drive mounting cover; a flange plate is bolted to the tail of the drive mounting cover; a limit stop is fixedly mounted inside the drive mounting cover; a switch is externally connected to the drive motor; a swing arm is fixedly mounted on the output shaft of the drive motor; the limit stop is used to limit the swing arm; and the end of the swing arm has an arc-shaped structure.

[0007] In at least some embodiments, the drive control unit further includes: a measuring switch and a ventilation switch, wherein the measuring switch is fixedly installed inside the drive mounting cover; the ventilation switch is fixedly installed inside the drive mounting cover; the swing arm is used to rotate and compress the measuring switch and the ventilation switch; the measuring switch and the level gauge body are connected in series with a power supply; and the wiring harnesses of the measuring switch and the ventilation switch are sealed through the drive mounting cover.

[0008] In at least some embodiments, the closed control component includes: a closed ball sleeve, a rotating ball, and a rotating shaft. The closed ball sleeve is fixedly fitted inside the measuring mounting cover; the rotating ball is rotatably fitted inside the closed ball sleeve; the rotating ball has a through hole; the closed ball sleeve has a through hole; the rotating shaft is fixedly mounted on the rotating ball, and the rotating shaft is rotatably fitted onto the closed ball sleeve; the rotating shaft passes through the measuring mounting cover; the output shaft of the drive motor is fixedly inserted into the rotating shaft; and the rotating ball is located below the level gauge body.

[0009] In at least some embodiments, the safety ventilation component includes: a ventilation mounting pipe and a suction pump, wherein the ventilation mounting pipe is fixedly mounted on the measuring mounting cover; a solenoid valve is provided on the ventilation mounting pipe; a suction pump is fixedly mounted on the ventilation mounting pipe; the ventilation mounting pipe communicates with the interior of the measuring mounting cover; and the solenoid valve, suction pump, and ventilation switch on the ventilation mounting pipe are connected to an external series power supply.

[0010] In at least some embodiments, the safety ventilation component further includes: an exhaust pipe, which is fixedly installed on the suction pump; an external gas storage tank is connected to the end of the exhaust pipe; and the end of the exhaust pipe is away from the liquid storage tank.

[0011] In at least some embodiments, the heating guide includes: a guide rod and a limiting ball, wherein the guide rod is fixedly installed at the bottom of the measuring mounting cover; the limiting ball is fixedly installed at the end of the guide rod; and the guide rod is installed at an angle.

[0012] In at least some embodiments, the temperature control safety component includes: a temperature control mounting ball, a temperature control bracket, and a temperature control switch. The temperature control mounting ball is slidably sleeved on a guide rod. A gap is provided between the temperature control mounting ball and the guide rod. The temperature control mounting ball has a double-layer hollow structure. A temperature control bracket is fixedly installed on the inner side of the temperature control mounting ball. A temperature control switch is fixedly installed on the temperature control bracket. The end of the temperature control switch is attached to the inner side of the temperature control mounting ball. The temperature control switch and a switch externally connected to the drive motor are connected in series with a power supply. The wiring harness of the temperature control switch passes through the temperature control mounting ball in a sealed manner.

[0013] In at least some embodiments, the temperature control safety component further includes: a counterweight ring, wherein the counterweight ring is fixedly installed on the inner side of the temperature control mounting ball; the temperature control mounting ball is used to float on the liquid surface.

[0014] This invention provides a level gauge for hazardous chemical storage tanks, which has the following advantages:

[0015] In this invention, a drive control component is used in conjunction with a sealing control component, which facilitates the sealing of the liquid level gauge body and prevents the bottom probe of the liquid level gauge body from being corroded by volatile gases when not measuring, thereby extending the service life of the liquid level gauge body. The use of a measuring switch to control the power supply to the liquid level gauge body further ensures that the rotating ball rotates completely without obstructing the liquid level gauge body when liquid level measurement is actually required, thus ensuring detection accuracy.

[0016] In addition, the use of safety ventilation components can prevent the volatile gases remaining inside the measuring installation cover from continuously corroding the level gauge body. At the same time, after the operator controls the swivel ball to close, the suction pump can be automatically controlled to start ventilation, which can effectively eliminate the volatile gases remaining inside the measuring installation cover. Meanwhile, keeping the probe of the level gauge body continuously ventilated can prevent the formation of condensation beads on the probe of the level gauge body, which would affect the next level measurement, or cause the level gauge body to rust and mold due to excessive humidity of the condensation beads.

[0017] In addition, the use of temperature-controlled fuses, along with the tilted heating guide, will not obstruct the liquid level gauge body from measuring the liquid level. At the same time, the temperature-controlled mounting ball can float on the oil surface. The temperature control switch can be used to easily detect the oil temperature in real time. By detecting the temperature of the upper layer of oil, the fluidity of the oil can be reflected, avoiding the formation of local depressions due to low oil fluidity when the oil is discharged, which would affect the detection accuracy. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0019] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0020] In the attached diagram:

[0021] Figure 1 A schematic diagram of the overall structure of a level gauge for a hazardous chemical storage tank according to this application is shown;

[0022] Figure 2 A schematic diagram of the bottom structure of a level gauge for a hazardous chemical storage tank according to this application is shown;

[0023] Figure 3 A cross-sectional view of the internal structure of a level gauge for a hazardous chemical storage tank according to this application is shown;

[0024] Figure 4 A schematic diagram of the overall structure of the measuring mounting component of this application is shown;

[0025] Figure 5 A schematic diagram of the overall structure of the drive control component of this application is shown;

[0026] Figure 6 This application shows Figure 3 Enlarged view of the structure of region D in the middle;

[0027] Figure 7 A schematic diagram of the overall structure of the enclosure control component of this application is shown;

[0028] Figure 8 A schematic diagram of the overall structure of the safety ventilation component of this application is shown;

[0029] Figure 9 A schematic diagram of the overall structure of the heating guide of this application is shown;

[0030] Figure 10 This application shows Figure 9 Enlarged view of the structure of region E in the middle.

[0031] List of reference numerals in the attached diagram:

[0032] 1. Measuring mounting components; 101. Measuring mounting cover; 1011. Level gauge body; 102. Air inlet pipe; 103. Bend; 2. Drive control components; 201. Drive mounting cover; 202. Drive motor; 203. Limit stop; 204. Swing arm; 205. Measuring switch; 206. Ventilation switch; 3. Sealing control components; 301. Sealing ball sleeve; 302. Rotating ball; 3021. Rotating shaft; 4. Safety ventilation components; 401. Ventilation mounting pipe; 402. Suction pump; 403. Exhaust pipe; 5. Heating guide components; 501. Guide rod; 502. Limit ball; 6. Temperature control fuse components; 601. Temperature control mounting ball; 602. Temperature control frame; 603. Temperature control switch; 604. Counterweight ring. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: Please refer to Figures 1 to 10 :

[0035] This invention proposes a level gauge for a hazardous chemical storage tank, comprising a measuring mounting component 1, a drive control component 2 mounted on the measuring mounting component 1, the drive control component 2 being used to control and isolate the measured liquid level; a sealing control component 3 mounted at the bottom of the measuring mounting component 1, the sealing control component 3 being used to protect the measuring mounting component 1; a safety ventilation component 4 mounted on the measuring mounting component 1, the safety ventilation component 4 being used to prevent the measuring mounting component 1 from getting damp; a heating guide component 5 mounted at the bottom of the measuring mounting component 1; a temperature control fuse component 6 mounted on the heating guide component 5, the temperature control fuse component 6 being used to detect the flowability of the stored liquid; the measuring mounting component 1 includes: a measuring mounting cover 101 and a level gauge body 1011, the level gauge body 1011 being fixedly mounted on the measuring mounting cover 101 by bolts; the end of the level gauge body 1011 being located inside the measuring mounting cover 101; and a flange for mounting on the storage tank being provided at the bottom of the measuring mounting cover 101.

[0036] In this embodiment, the measuring mounting component 1 includes: an air inlet pipe 102 and a bend pipe 103. The air inlet pipe 102 is threadedly connected to a flange on the level gauge body 1011. A one-way valve is provided on the air inlet pipe 102. The bend pipe 103 is fixedly installed on the top of the air inlet pipe 102. The bend pipe 103 is used for waterproofing. The drive control component 2 includes: a drive mounting cover 201, a drive motor 202, a limit stop 203, and a swing arm 204. The drive mounting cover 201 is fixedly installed on the side of the measuring mounting cover 101. The drive motor 202 is fixedly installed inside the drive mounting cover 201. A flange baffle is bolted to the tail of the drive mounting cover 201. A flange baffle is fixedly installed inside the drive mounting cover 201. The system includes a limit stop 203; a switch connected to the drive motor 202; a swing arm 204 fixedly mounted on the output shaft of the drive motor 202; the limit stop 203 is used to limit the swing arm 204; the end of the swing arm 204 has an arc-shaped structure; the drive control component 2 also includes: a measuring switch 205 and a ventilation switch 206, the measuring switch 205 is fixedly mounted inside the drive mounting cover 201; the ventilation switch 206 is fixedly mounted inside the drive mounting cover 201; the swing arm 204 is used to rotate and compress the measuring switch 205 and the ventilation switch 206; the measuring switch 205 and the level gauge body 1011 are connected in series with a power supply; the closed control component 3 includes: a closed ball sleeve 301, a rotating ball 302 and a rotating shaft. 3021, a closed ball sleeve 301 is fixedly fitted inside the measuring mounting cover 101; a rotating ball 302 is rotatably fitted inside the closed ball sleeve 301; the rotating ball 302 has a through hole; the closed ball sleeve 301 has a through hole; a rotating shaft 3021 is fixedly installed on the rotating ball 302, and the rotating shaft 3021 is rotatably fitted on the closed ball sleeve 301; the rotating shaft 3021 passes through the measuring mounting cover 101; the output shaft of the drive motor 202 is fixedly inserted into the rotating shaft 3021; ​​the rotating ball 302 is located below the level gauge body 1011, and the drive control component 2 cooperates with the closing control component 3 to facilitate the closure of the level gauge body 1011, preventing the level gauge body 1011 from being closed when not measuring. The corrosion of the bottom probe by volatile gases can effectively extend the service life of the level gauge body 1011. Simultaneously, the rotating ball 302 facilitates quick removal of obstruction when level measurement is required. The measurement switch 205 controls the energization of the level gauge body 1011, further ensuring that the rotating ball 302 fully rotates without obstructing the level gauge body 1011 during actual level measurement, guaranteeing detection accuracy. The structure is simple and reasonable. Furthermore, this structure facilitates independent disassembly of the level gauge body 1011 for maintenance and other work. Disassembly of the level gauge body 1011 for maintenance does not affect the sealing of the storage tank, preventing hazardous gas leakage. The control of this structure is simple.

[0037] In this embodiment, the safety ventilation component 4 includes: a ventilation mounting pipe 401 and a suction pump 402. The ventilation mounting pipe 401 is fixedly mounted on the measuring mounting cover 101. An electromagnetic valve is provided on the ventilation mounting pipe 401. The suction pump 402 is fixedly mounted on the ventilation mounting pipe 401. The ventilation mounting pipe 401 connects to the interior of the measuring mounting cover 101. The electromagnetic valve, suction pump 402, and ventilation switch 206 on the ventilation mounting pipe 401 are connected to an external series power supply. The safety ventilation component 4 also includes: an exhaust pipe 403. The exhaust pipe 403 is fixedly mounted on the suction pump 402. An external gas storage tank is connected to the end of the exhaust pipe 403. The end of the exhaust pipe 403 is far from the liquid storage tank. By using the safety ventilation component 4 in conjunction with the drive motor 202 to drive the swing arm 204 to rotate and control the switching and measurement of the level gauge body 1011, the continuous corrosion of the level gauge body 1 by residual volatile gases inside the measuring mounting cover 101 can be further avoided. 011. Simultaneously, after the operator controls the rotary ball 302 to close, the suction pump 402 can be automatically controlled to start ventilation, which can effectively eliminate the volatile gases remaining inside the measuring installation cover 101. At the same time, maintaining continuous ventilation of the probe of the level gauge body 1011 can prevent condensation beads from forming on the probe of the level gauge body 1011, which would affect the next level measurement, or cause rust and mold on the level gauge body 1011 due to excessive humidity of the condensation beads. The structure is simple to control and ensures accurate measurement data. When the control drive motor 202 drives the rotary ball 302 to rotate in the opposite direction and reset, and closes the through hole on the rotary ball 302 through the closed ball sleeve 301, it will drive the swing arm 204 to press the ventilation switch 206. At this time, the ventilation switch 206 controls the solenoid valve on the ventilation installation pipe 401 and the suction pump 402 to be energized and opened, so as to achieve the suction pump 402 to draw air from the inside of the measuring installation cover 101 and maintain ventilation.

[0038] In Example 2, based on Example 1, the heating guide 5 includes: a guide rod 501 and a limiting ball 502. The guide rod 501 is fixedly installed at the bottom of the measuring mounting cover 101; the limiting ball 502 is fixedly installed at the end of the guide rod 501; the guide rod 501 is installed at an angle; the temperature control safety component 6 includes: a temperature control mounting ball 601, a temperature control frame 602, and a temperature control switch 603. The temperature control mounting ball 601 is slidably sleeved on the guide rod 501; a gap is provided between the temperature control mounting ball 601 and the guide rod 501; the temperature control mounting ball 601... It has a double-layer hollow structure; a temperature control frame 602 is fixedly installed inside the temperature control mounting ball 601; a temperature control switch 603 is fixedly installed on the temperature control frame 602; the end of the temperature control switch 603 is attached to the inside of the temperature control mounting ball 601; a KSD9700 type temperature control switch 603 can be used; the temperature control switch 603 and the external switch of the drive motor 202 are connected in series with a power supply; the temperature control fuse 6 also includes: a counterweight ring 604, which is fixedly installed inside the temperature control mounting ball 601; the temperature control mounting ball 601 is used to float on the liquid surface and uses temperature control. The safety component 6 can work with the tilted heating guide 5 to measure the liquid level without obstructing the main body 1011 of the level gauge. The temperature control ball 601 can float on the surface of the oil. The temperature control switch 603 can be used to easily detect the oil temperature in real time. By detecting the temperature of the upper layer of oil, the fluidity of the oil can be reflected. This avoids the situation where the oil fluidity is too low. If the oil heating is stopped too quickly after the discharge is completed or the heating of the oil storage tank is not turned on, it will affect the pressure balance in the tank. At the same time, if the temperature is not raised or the temperature is not up to standard, the oil near the discharge port will be discharged faster, forming a depression on the liquid surface, which will directly affect the accuracy of the liquid level detection. Usually, heating is required to improve the fluidity of the oil and restore the level liquid surface more quickly, which will also facilitate the flow and discharge of the oil. After the oil is heated, the temperature control switch 603 will detect that the temperature has reached the standard and control the power path of the external switch of the drive motor 202 in series. Only then can the drive motor 202 be controlled to rotate forward and reverse normally through the external switch of the drive motor 202.

[0039] The working principle of this embodiment is as follows: First, the flange at the bottom of the measuring mounting cover 101 is bolted to the liquid storage tank. When the liquid level gauge body 1011 needs to be started for liquid level measurement, the drive motor 202 needs to be controlled to drive the swing arm 204 to rotate. When the measuring switch 205 is pressed, the liquid level gauge body 1011 will be energized for measurement. When the drive motor 202 drives the swing arm 204 to rotate, it also drives the rotating ball 302 to rotate. The through hole on the rotating ball 302 will rotate to a vertical position, so as not to block the liquid level gauge body 1011. This ensures that the liquid level gauge body 1011 is unobstructed and the data is accurate when performing radar measurement. When the liquid level gauge body 1011 completes the liquid level measurement, the drive motor 202 drives the rotating ball 302 to rotate in the opposite direction to reset. When the through hole on the rotating ball 302 is closed by the sealing ball sleeve 301, the swing arm 204 will be driven to press. Ventilation switch 206, at this time, controls the solenoid valve on ventilation mounting pipe 401 and suction pump 402 to be energized and opened, so that suction pump 402 can draw air from the inside of measurement mounting cover 101 to maintain ventilation. At the same time, the one-way valve on air inlet pipe 102 can ensure that only air is allowed to flow and avoid leakage. Temperature control mounting ball 601 floats on the surface of oil and is guided by guide rod 501. Temperature control mounting ball 601 is made of metal structure, which facilitates heat conduction. After the oil is heated and the temperature rises, temperature control switch 603 will detect that the temperature has reached the standard and control the power path of the external switch of drive motor 202 in series. Only then can the drive motor 202 be controlled to rotate forward and reverse normally through the external switch of drive motor 202. Conversely, if the oil temperature is too low and the fluidity is not up to standard, drive motor 202 cannot start normally and needs to wait for heating.

[0040] The following points should be noted in this article:

[0041] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0042] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0043] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A liquid level gauge for a dangerous chemical storage tank, comprising a measurement mounting piece (1) on which a driving control piece (2) is mounted; characterized in that: The drive control piece (2) is used for controlling the isolated measuring liquid level; the bottom of the measuring installation piece (1) is provided with a sealing control piece (3); the sealing control piece (3) is used for protecting the measuring installation piece (1); The measuring installation piece (1) is provided with a safety ventilation piece (4); the safety ventilation piece (4) is used for preventing the measuring installation piece (1) from being damp; The bottom of the measuring installation piece (1) is provided with a heating guide piece (5); the heating guide piece (5) is provided with a temperature control safety piece (6); the temperature control safety piece (6) is used for detecting the fluidity of the liquid storage; The measuring installation piece (1) comprises a measuring installation cover (101) and a liquid level meter body (1011), the liquid level meter body (1011) is fixedly installed on the measuring installation cover (101) through bolts; the end of the liquid level meter body (1011) is located inside the measuring installation cover (101); the bottom of the measuring installation cover (101) is provided with a flange for being installed on the liquid storage tank.

2. The liquid level meter for a dangerous chemical storage tank according to claim 1, wherein The measuring installation piece (1) comprises an air inlet pipe (102) and an elbow pipe (103), the air inlet pipe (102) is threadedly connected to the flange on the liquid level meter body (1011); the air inlet pipe (102) is provided with a check valve; the air inlet pipe (102) is fixedly installed with the elbow pipe (103) at the top; the elbow pipe (103) is used for preventing water.

3. The liquid level meter for a dangerous chemical storage tank according to claim 1, wherein The drive control piece (2) comprises a drive installation cover (201), a drive motor (202), a limiting stopper (203) and a swing arm (204), the drive installation cover (201) is fixedly installed on the side of the measuring installation cover (101); the drive installation cover (201) is fixedly installed with the drive motor (202) inside; the tail of the drive installation cover (201) is connected with a flange stop disc through bolts; the limiting stopper (203) is fixedly installed inside the drive installation cover (201); the drive motor (202) is connected with a switch; the swing arm (204) is fixedly installed on the output shaft of the drive motor (202); the limiting stopper (203) is used for limiting the swing arm (204); the end of the swing arm (204) is in an arc structure.

4. The liquid level meter for a dangerous chemical storage tank according to claim 3, characterized in that, The drive control piece (2) further comprises a measuring switch (205) and a ventilation switch (206), the measuring switch (205) is fixedly installed inside the drive installation cover (201); the ventilation switch (206) is fixedly installed inside the drive installation cover (201); the swing arm (204) is used for rotating and pressing the measuring switch (205) and the ventilation switch (206); the measuring switch (205) and the liquid level meter body (1011) are connected in series with a power supply.

5. The liquid level meter for a dangerous chemical storage tank according to claim 3, characterized in that, The closed control piece (3) comprises a closed ball sleeve (301), a rotating ball (302) and a rotating shaft (3021), the closed ball sleeve (301) is fixedly sleeved inside the measuring installation cover (101); the rotating ball (302) is rotatably sleeved inside the closed ball sleeve (301); the rotating ball (302) is provided with a through hole; the closed ball sleeve (301) is provided with a through hole; the rotating shaft (3021) is fixedly installed on the rotating ball (302) and rotatably sleeved on the closed ball sleeve (301); the rotating shaft (3021) penetrates the measuring installation cover (101); the output shaft of the driving motor (202) is fixedly inserted on the rotating shaft (3021); the rotating ball (302) is located below the liquid level meter main body (1011).

6. The liquid level meter for a dangerous chemical storage tank according to claim 4, wherein The safety ventilation piece (4) comprises a ventilation installation pipe (401) and a suction pump (402), the ventilation installation pipe (401) is fixedly installed on the measuring installation cover (101); the ventilation installation pipe (401) is provided with an electromagnetic valve; the suction pump (402) is fixedly installed on the ventilation installation pipe (401); the ventilation installation pipe (401) is communicated with the inside of the measuring installation cover (101); the electromagnetic valve, the suction pump (402) and the ventilation switch (206) on the ventilation installation pipe (401) are externally connected in series with a power supply.

7. The liquid level meter for a dangerous chemical storage tank according to claim 6, wherein The safety ventilation piece (4) further comprises an exhaust pipe (403), the exhaust pipe (403) is fixedly installed on the suction pump (402); the exhaust pipe (403) is externally connected with a gas storage tank at the end; the exhaust pipe (403) is away from the liquid storage tank at the end.

8. The liquid level meter for a dangerous chemical storage tank according to claim 3, characterized in that, The heating guide piece (5) comprises a guide rod (501) and a limiting ball (502), the guide rod (501) is fixedly installed at the bottom of the measuring installation cover (101); the limiting ball (502) is fixedly installed at the end of the guide rod (501); the guide rod (501) is obliquely installed.

9. The liquid level gauge for a dangerous chemical storage tank according to claim 8, wherein The temperature control safety piece (6) comprises a temperature control installation ball (601), a temperature control frame (602) and a temperature control switch (603), the temperature control installation ball (601) is slidably sleeved on the guide rod (501); a gap is arranged between the temperature control installation ball (601) and the guide rod (501); the temperature control installation ball (601) is a double-layer hollow structure; the temperature control frame (602) is fixedly installed inside the temperature control installation ball (601); the temperature control switch (603) is fixedly installed on the temperature control frame (602); the temperature control switch (603) is attached to the inside of the temperature control installation ball (601) at the end; the temperature control switch (603) and the switch of the driving motor (202) are connected in series with a power supply.

10. The liquid level meter for a dangerous chemical storage tank according to claim 9, wherein The temperature control safety piece (6) further comprises a counterweight ring (604), the counterweight ring (604) is fixedly installed inside the temperature control installation ball (601); the temperature control installation ball (601) is used for floating on the liquid surface.

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