A liquid level alarm and its usage method

Abstract

This application discloses a liquid level alarm and its usage method, relating to the technical field of liquid level detection equipment, and solves the problem of equipment being contaminated by spilled asphalt in the prior art. The liquid level alarm provided by this application includes a sliding assembly, a cylinder, an alarm assembly, a liquid level float, a spray assembly, and a control system. A sensing slider is disposed within the cylinder and connected to one end of a sliding rod, with a contact switch located at the bottom of the sensing slider. The other end of the sliding rod extends outside the cylinder and is connected to the liquid level float. A high-level sensor and an ultrasonic velocimeter are disposed at the top of the cylinder, and a low-level sensor is connected to the bottom of the cylinder. The high-level alarm of the alarm assembly is connected to the high-level sensor, and the low-level alarm is connected to the low-level sensor. The spray assembly includes a spray pipe and nozzles connected to the spray pipe. A solenoid valve is disposed on the spray pipe. The nozzles are positioned facing the liquid level float. The control system is electrically connected to the ultrasonic velocimeter and the solenoid valve respectively.

Description

Technical Field

[0001] This application relates to the field of liquid level detection equipment, and in particular to a liquid level alarm and its usage method. Background Technology

[0002] Asphalt is a complex, dark brown mixture composed of hydrocarbons of varying molecular weights and non-metallic derivatives. It is a high-viscosity organic liquid, often existing in liquid or semi-solid petroleum form. Asphalt is a waterproof, moisture-proof, and corrosion-resistant organic gel material. Therefore, it is mainly used in the production of industrial products such as coatings, plastics, and rubber, as well as in road paving. Asphalt tanks are internally heated, locally rapid asphalt storage and heating devices, integrating rapid heating, energy saving, and environmental protection into asphalt equipment.

[0003] In actual production, asphalt at a slightly lower temperature than normal is injected into the asphalt tank for heating. However, during the asphalt injection process, operators need to regularly check the asphalt injection volume. Alternatively, before injection, it is necessary to measure the presence of asphalt in the tank and the asphalt level. If operators fail to check in a timely manner, asphalt may overflow from the asphalt pipe, contaminating or even damaging other equipment. Furthermore, the asphalt vapor generated during heating can adhere to other components of the tank, causing contamination or even damage.

[0004] Therefore, there is a need for a device that can replace operators in regularly checking the liquid level in the asphalt tank to prevent the equipment from being contaminated by overflowing asphalt. Summary of the Invention

[0005] This application provides a liquid level alarm and its usage method, which solves the problem in the prior art where operators' inspections are not timely, leading to equipment contamination by overflowing asphalt. It achieves the purpose of replacing operators in regular inspections and preventing equipment from being contaminated by overflowing asphalt.

[0006] This application provides a liquid level alarm device, including a sliding assembly, a cylinder, an alarm assembly, a liquid level float, a spray assembly, and a control system;

[0007] The sliding assembly includes a sensing slider and a sliding rod;

[0008] The sensing slider is disposed in the cylinder and connected to one end of the top of the slide rod. The sensing slider can drive the slide rod to slide in the cylinder, and a contact switch is provided at the bottom of the sensing slider.

[0009] One end of the slide bar extends to the outside of the cylinder and is connected to the liquid level float;

[0010] A high-position sensor and an ultrasonic velocimeter are installed at the top of the cylinder, and a low-position sensor is connected to the bottom of the cylinder.

[0011] The alarm component includes a high-level alarm and a low-level alarm, wherein the high-level alarm is connected to the high-level sensor and the low-level alarm is connected to the low-level sensor.

[0012] The spray assembly includes a spray pipe and a nozzle connected to the spray pipe;

[0013] The spray pipe is equipped with a solenoid valve;

[0014] The nozzle is positioned toward the liquid level float;

[0015] The control system is electrically connected to the ultrasonic velocimeter and the solenoid valve, respectively.

[0016] In one possible implementation, the device also includes an ultrasonic rangefinder;

[0017] The ultrasonic rangefinder is connected to the outer wall of the cylinder and is used to detect the real-time liquid level.

[0018] In one possible implementation, the device further includes a protective sleeve disposed at the bottom of the cylinder, with one end of the bottom of the slide rod passing through the protective sleeve and connected to the liquid level float.

[0019] In one possible implementation, the protective sleeve is connected to a protective sleeve frame at one end near the liquid level float, and the protective sleeve frame is sheet-shaped.

[0020] The protective sleeve is slidably connected to one end of the bottom of the slide rod.

[0021] In one possible implementation, a control junction box is provided on the top of the cylinder block;

[0022] The control junction box is electrically connected to the high-level sensor, the low-level sensor, the high-level alarm, and the low-level alarm, respectively.

[0023] In one possible implementation, a groove is also provided on the side wall of the cylinder, and the groove is provided along the height direction of the cylinder.

[0024] In one possible implementation, a sealing ring is provided on the bottom surface of the cylinder.

[0025] In one possible implementation, the level float is arranged as a hollow metal sphere.

[0026] A method of using a liquid level alarm includes:

[0027] Activate the liquid level alarm;

[0028] When the asphalt level rises at a rate lower than the set value, the level alarm is cleaned.

[0029] When the asphalt level is higher than the set value of the level alarm, the level alarm will issue a high-level alarm.

[0030] In one possible implementation, the method further includes: cleaning the liquid level alarm when the rate of drop in asphalt liquid level is lower than a set value;

[0031] When the asphalt level is lower than the set value of the level alarm, the level alarm will issue a low-level alarm.

[0032] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0033] This application provides a liquid level alarm, including a sliding assembly, a cylinder, an alarm assembly, and a liquid level float. The sliding assembly includes a sliding rod and a sensing slider, and the alarm assembly includes a high-level alarm and a low-level alarm. Specifically, one end of the sliding rod is slidably connected to the cylinder via the slider, and the bottom end passes through the bottom surface of the cylinder and connects to the liquid level float. A high-level sensor capable of detecting the sensing slider within a certain distance is provided at the top of the cylinder, and a low-level sensor capable of contacting a contact switch located on the bottom surface of the sensing slider is provided at the bottom of the cylinder. Specifically, the high-level sensor connected to the high-level alarm enables a high liquid level alarm, and the low-level sensor connected to the low-level alarm enables a low liquid level alarm. Furthermore, an ultrasonic velocimeter detects the rising speed of the liquid level float and compares it with the rate of change of the asphalt liquid level. Further, the control system controls a spray assembly to clean oil stains on the sliding rod to ensure the detection sensitivity of the liquid level alarm. The liquid level alarm provided in this application effectively solves the problem in the prior art where operators fail to conduct timely inspections, resulting in equipment being contaminated by overflowing asphalt. It can replace operators in conducting regular inspections and prevent equipment from being contaminated by overflowing asphalt. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is an overall structural view of the liquid level alarm provided in the embodiments of this application;

[0036] Figure 2 This is a schematic diagram of the circuit connection relationship of the liquid level alarm provided in the embodiments of this application;

[0037] Figure 3 for Figure 2 Sectional view at point AA;

[0038] Figure 4 This is a view of the main internal structure of the cylinder block provided in an embodiment of this application.

[0039] Reference numerals: 100-Sliding assembly; 110-Slide rod; 120-Sensing slider; 200-Cylinder body; 210-High position sensor; 220-Low position sensor; 230-Control junction box; 240-Wire trough; 300-Alarm assembly; 310-High position alarm; 320-Low position alarm; 400-Level float; 500-Ultrasonic rangefinder; 600-Protective cover; 610-Protective cover bracket; 700-Ultrasonic rangefinder display; 800-Ultrasonic velocimeter; 900-Spray assembly; 910-Spray pipe; 911-Vertical spray pipe; 912-Annular spray pipe; 920-Spray head. Detailed Implementation

[0040] The technical solutions of the embodiments of this application 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 this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0042] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0043] like Figure 1-4 As shown in the embodiment of this application, a liquid level alarm includes a sliding assembly 100, a cylinder 200, an alarm assembly 300, a liquid level float 400, a spray assembly 900, and a control system.

[0044] The sliding assembly 100 includes a sensing slider 120 and a slider 110.

[0045] The sensing slider 120 is disposed inside the cylinder 200 and connected to one end of the top of the slide rod 110. The sensing slider 120 can drive the slide rod 110 to slide inside the cylinder 200, and a contact switch is provided at the bottom of the sensing slider 120.

[0046] One end of the bottom of the slide bar 110 extends to the outside of the cylinder body 200 and is connected to the liquid level float 400.

[0047] A high-position sensor 210 and an ultrasonic velocimeter 800 are installed on the top of the cylinder block 200, and a low-position sensor 220 is connected to the bottom of the cylinder block 200.

[0048] The alarm assembly 300 includes a high-level alarm 310 and a low-level alarm 320. The high-level alarm 310 is connected to the high-level sensor 210, and the low-level alarm 320 is connected to the low-level sensor 220.

[0049] The spray assembly 900 includes a spray pipe 910 and a nozzle 920 connected to the spray pipe 910.

[0050] A solenoid valve is installed on the spray pipe 910.

[0051] The nozzle 920 is positioned towards the liquid level float 400.

[0052] The control system is electrically connected to the ultrasonic velocimeter 800 and the solenoid valve, respectively.

[0053] It should be noted that, as Figure 1 As shown, the liquid level alarm also includes an anthracene oil storage tank and an anthracene oil heating device. The outlet of the anthracene oil storage tank is connected to the inlet of the spray pipe 910. The outlet of the spray pipe 910 is connected to the spray head 920. Multiple spray heads 920 are arranged circumferentially along the liquid level float 400. The anthracene oil heating device is located inside the anthracene oil storage tank and heats the anthracene oil. In addition, a temperature sensor is also installed inside the anthracene oil storage tank.

[0054] The alarm assembly 300, sprinkler assembly 900, high-level sensor 210, low-level sensor 220, ultrasonic velocimeter 800, solenoid valve, and temperature sensor are electrically connected to the control system.

[0055] like Figure 1 and Figure 3 As shown, the spray pipe 910 includes a vertical spray pipe 911 and an annular spray pipe 912. The vertical spray pipe 911 is arranged vertically along the cylinder body 200, and multiple vertical spray pipes 911 are arranged circumferentially along the cylinder body 200. The inlets of the multiple vertical spray pipes 911 are respectively connected to the outlets of the anthracene oil storage tank, and the outlets of the multiple vertical spray pipes 911 are respectively connected to the annular spray pipe 912. The annular spray pipe 912 is connected to the cylinder body 200 at one end near the low-level sensor 220, and multiple nozzles 920 are arranged on the annular spray pipe 912. The nozzles 920 are oriented towards the liquid level float 400.

[0056] The control system, based on data uploaded by a temperature sensor installed inside the anthracene oil storage tank, further heats the anthracene oil in the storage tank by controlling the anthracene oil heating device. The control system then controls the pump unit and solenoid valve to spray the heated anthracene oil onto the portion of the slide rod 110 extending outside the cylinder 200, diluting and dissolving the contaminating asphalt on the slide rod 110. Furthermore, an anthracene oil stirring assembly is installed at the bottom of the anthracene oil storage tank, and this assembly includes multiple stirring blades. These blades are connected to a rotating shaft, which is connected to the power output of a motor. During the heating process, the anthracene oil stirring assembly stirs the anthracene oil in the storage tank, ensuring uniform heating and thus more effectively diluting and dissolving the contaminating asphalt on the slide rod 110.

[0057] This application provides a liquid level alarm, including a sliding assembly 100, a cylinder 200, an alarm assembly 300, and a liquid level float 400. The sliding assembly 100 includes a slide rod 110 and a sensing slider 120. The alarm assembly 300 includes a high-level alarm 310 and a low-level alarm 320. Specifically, one end of the slide rod 110 is slidably connected to the cylinder 200 via the slider, and the bottom end passes through the bottom surface of the cylinder 200 and connects to the liquid level float 400. A high-level sensor 210, capable of detecting the sensing slider 120 within a certain distance, is provided at the top of the cylinder 200. A low-level sensor 220, capable of contacting a contact switch located on the bottom surface of the sensing slider 120, is provided at the bottom of the cylinder 200. Specifically, the high-level sensor 210 connected to the high-level alarm 310 enables a high liquid level alarm, and the low-level sensor 220 connected to the low-level alarm 320 enables a low liquid level alarm. In addition, the ultrasonic velocimeter 800 detects the rising speed of the liquid level float 400 and compares it with the rate of change of the liquid level. Furthermore, the control system controls the spray assembly 900 to clean the oil stains on the slide bar 110 to ensure the detection sensitivity of the liquid level alarm. The liquid level alarm provided in this application effectively solves the problem in the prior art where untimely inspections by operators lead to equipment contamination by overflowing asphalt, thus achieving the purpose of replacing operators in regular inspections and preventing equipment contamination by overflowing asphalt. In another embodiment, the slide bar 110 is configured as a lead screw.

[0058] like Figure 1 As shown, in one possible implementation, the liquid level alarm also includes an ultrasonic rangefinder 500. The ultrasonic rangefinder 500 is connected to the outer wall of the cylinder 200 and is used to detect the real-time liquid level.

[0059] It should be noted that the ultrasonic rangefinder 500 is electrically connected to the ultrasonic rangefinder display 700 and the control system, respectively.

[0060] When asphalt is injected into the asphalt tank: the ultrasonic rangefinder 500 measures the rising speed V1 of the asphalt level in the cylinder 200 and uploads the rising speed V1 of the asphalt level in the asphalt tank to the control system. The control system processes the data V1 measured by the ultrasonic rangefinder 500 and the rising speed V2 of the liquid level float 400 or the sensing slider 120 measured by the ultrasonic velocimeter 800, and V2 > 0. When the difference between V1 and V2 exceeds the preset range value of the control system, the control system can determine that the sensitivity of the slide bar 110 has decreased. At the same time, the control system controls the solenoid valve on the spray pipe 910 to open, so that the nozzle 920 sprays anthracene oil onto the part of the slide bar 110 that extends into the cylinder 200.

[0061] When the asphalt tank discharges asphalt: the ultrasonic rangefinder 500 measures the rate of asphalt level descent V3 within the cylinder 200 and uploads this rate to the control system. The control system processes the data V4 measured by the ultrasonic rangefinder 500 and the rate of descent V3 measured by the ultrasonic velocimeter 800 (either the rate of descent of the level float 400 or the sensing slider 120). If V3 > 0, and the difference between V3 and V4 exceeds the preset range of the control system, the control system can determine that the sensitivity of the slide bar 110 has decreased. Simultaneously, the control system opens the solenoid valve on the spray pipe 910, causing the nozzle 920 to spray anthracene oil onto the portion of the slide bar 110 extending into the cylinder 200.

[0062] like Figure 1 As shown, in one possible implementation, the liquid level alarm also includes a protective sleeve 600, which is disposed at the bottom of the cylinder 200. One end of the bottom of the slide rod 110 passes through the protective sleeve 600 and is connected to the liquid level float 400.

[0063] It should be noted that the protective cover 600 is detachably connected to the bottom of the cylinder body 200, and the protective cover 600 is an accordion cover.

[0064] During the sliding process, the bellows cover protects the portion of the slide rod 110 extending to the bottom of the cylinder 200 from oil contamination. Specifically, when the level alarm detects the liquid level of high-temperature asphalt in the asphalt tank, it is easily contaminated by high-temperature asphalt vapor. Some of the asphalt vapor rises and adheres to the portion of the slide rod 110 extending to the bottom of the cylinder 200, potentially causing blockage when the slide rod 110 slides through the sliding interface at the bottom of the cylinder 200. The protective sleeve 600 blocks the high-temperature asphalt vapor on its outer surface, thus ensuring that the slide rod 110 inside the protective sleeve 600 effectively transmits the asphalt level in the asphalt tank. During regular inspection and maintenance of the level alarm, the protective sleeve 600 can be detachably connected to the bottom of the cylinder 200, facilitating disassembly, cleaning, or replacement of the protective sleeve 600 at the bottom of the cylinder 200 by maintenance personnel.

[0065] like Figure 1 As shown, in one possible implementation, a protective sleeve 600 is connected to a protective sleeve frame 610 near the end of the liquid level float 400, and the protective sleeve frame 610 is plate-shaped. The protective sleeve frame 610 is slidably connected to one end of the bottom of the slide rod 110.

[0066] It should be noted that the protective sleeve 600 has a mesh structure to block oil stains, with pleats along its circumference and multiple pleats along its vertical direction. The protective sleeve frame 610 is a metal structure and is fixedly connected to the slide rod 110, with an anti-oil stain sealing ring provided at the connection between the protective sleeve frame 610 and the slide rod 110.

[0067] The end of the slide rod 110 connected to the level float 400 causes the protective sleeve 600 to extend and retract during the rise and fall of the asphalt level. Specifically, when the slide rod 110 slides towards the bottom of the asphalt tank, the protective sleeve bracket 610 causes the protective sleeve 600 to gradually stretch; when the slide rod 110 slides towards the top of the asphalt tank, the protective sleeve bracket 610 causes the protective sleeve 600 to gradually compress. Furthermore, this ensures that the slide rod 110 is not contaminated by oil vapor or oil from inside the asphalt tank during sliding, thereby ensuring the normal operation of the level alarm.

[0068] like Figure 1 As shown, in one possible implementation, a control junction box 230 is provided on the top of the cylinder block 200. The control junction box 230 is electrically connected to the high-level sensor 210, the low-level sensor 220, the high-level alarm 310, and the low-level alarm 320, respectively.

[0069] It should be noted that a thermometer is installed inside the control junction box 230, and the interior of the control junction box 230 is lined with a flame-retardant layer. The high-temperature alarm and the thermometer are electrically connected to the control system, with the high-temperature alarm located on the top of the cylinder block 200.

[0070] The control junction box 230 is connected to various circuits, thereby centralizing the control of the liquid level alarm detector. A thermometer monitors the temperature inside the control junction box 230 in real time and uploads the measured data to the control system. Furthermore, the control system compares the temperature data uploaded by the thermometer with a preset temperature range. When the temperature data uploaded by the thermometer exceeds the preset temperature range, the control system activates the high-temperature alarm; when the temperature data uploaded by the thermometer does not exceed the preset temperature range, the control system processes the next data uploaded by the thermometer. In the event of a fire inside the control junction box 230, the flame-retardant layer inside the control junction box 230 prevents the fire from spreading.

[0071] like Figure 1 and Figure 3 As shown, in one possible implementation, a wire groove 240 is also provided on the side wall of the cylinder body 200, and the wire groove 240 is provided along the height direction of the cylinder body 200.

[0072] It should be noted that the groove 240 is a U-shaped groove or a dovetail groove on the inner wall of the cylinder 200, and the U-shaped groove or dovetail groove is recessed to the side away from the axis of the cylinder 200.

[0073] The wire groove 240 can prevent the wire from getting tangled inside the cylinder 200, and also ensure that the sensing slider 120 can slide inside the cylinder 200.

[0074] In another embodiment, a plurality of grooves 240 are formed on the inner wall of the cylinder 200 along its vertical direction.

[0075] like Figure 1 As shown, in one possible implementation, a sealing ring is provided on the bottom surface of the cylinder block 200.

[0076] It should be noted that a sealing ring is provided at the connection between the bottom surface of the cylinder body 200 and the slide rod 110. The sealing ring is used to prevent oil from entering the cylinder body 200 and thus contaminating the interior of the cylinder body 200 and the components installed inside.

[0077] Furthermore, the liquid level float 400 is a hollow metal sphere.

[0078] It should be noted that the hollow metal spherical liquid level float 400 allows the liquid level alarm to ignore the weight of the liquid level float 400 during the detection process, preventing the liquid level float 400 from being submerged by asphalt due to excessive weight, which would affect the measurement accuracy of the liquid level.

[0079] In another embodiment, the level float 400 is a closed hollow metal sphere, and a certain amount of liquid is sealed inside the hollow metal sphere.

[0080] This application also provides a method for using a liquid level alarm, the method including: activating the liquid level alarm; cleaning the liquid level alarm when the asphalt liquid level rises at a rate lower than a set value; and issuing a high-level alarm when the asphalt liquid level is higher than the set value of the liquid level alarm.

[0081] It should be noted that one end of the slide rod 110 is slidably connected to the cylinder body 200 via a slider, and the bottom end passes through the bottom surface of the cylinder body 200 and is connected to the liquid level float 400. A high-level sensor 210, capable of detecting the sensing slider 120 within a certain distance, is installed at the top of the cylinder body 200, and a low-level sensor 220, capable of contacting a contact switch located on the bottom surface of the sensing slider 120, is installed at the bottom of the cylinder body 200. Specifically, the high-level sensor 210, connected to the high-level alarm 310, enables a high liquid level alarm, and the low-level sensor 220, connected to the low-level alarm 320, enables a low liquid level alarm. Furthermore, the ultrasonic velocimeter 800 detects the rising speed of the liquid level float 400 and compares it with the rate of change in the liquid level. Further, the control system controls the spray assembly 900 to clean the oil stains on the slide rod 110 to ensure the detection sensitivity of the liquid level alarm. The liquid level alarm provided in this application effectively solves the problem in the prior art where operators fail to conduct timely inspections, resulting in equipment being contaminated by overflowing asphalt. It can replace operators in conducting regular inspections and prevent equipment from being contaminated by overflowing asphalt.

[0082] Specifically, when asphalt is injected into the cylinder 200, the liquid level alarm is activated. The asphalt surface in the asphalt tank exerts an upward force on the liquid level float 400, causing the float 400 to float on the asphalt surface. As the amount of asphalt injected into the asphalt tank increases, the liquid level in the asphalt tank gradually rises, pushing the liquid level float 400 upward. The liquid level float 400 pushes the slide bar 110 upward, and simultaneously the slide bar 110 pushes the sensing slider 120 upward. When the sensing slider 120 moves into the detection range of the high-level sensor 210, the sensing slider 120 transmits a signal to the control system. The control system further controls the high-temperature alarm 310 to issue a high-level alarm.

[0083] In addition, the ultrasonic rangefinder 500 measures the rising speed V1 of the asphalt level in the asphalt tank and uploads it to the control system. The control system processes the data V1 measured by the ultrasonic rangefinder 500 and the rising speed V2 of the liquid level float 400 or the sensing slider 120 measured by the ultrasonic velocimeter 800, and V2 > 0. When the difference between V1 and V2 exceeds the preset range of the control system, the control system can determine that the sensitivity of the slide bar 110 has decreased. At the same time, the control system controls the solenoid valve on the spray pipe 910 to open, thereby causing the nozzle 920 to spray anthracene oil onto the part of the slide bar 110 that extends to the cylinder 200.

[0084] Furthermore, when the rate of asphalt level drop falls below the set value, the level alarm is cleaned.

[0085] When the asphalt level is lower than the set value of the level alarm, the level alarm will issue a low-level alarm.

[0086] It should be noted that the liquid level alarm is activated when asphalt is extracted from the asphalt tank. The sliding component 100 and the liquid level float 400 come into contact with the asphalt surface under the influence of gravity. As the amount of asphalt in the tank decreases, the liquid level gradually drops, and the sliding component 100 and the liquid level float 400 also move downwards. When the contact switch at the bottom of the sensing slider 120 descends with the sensing slider 120 and contacts the low-level sensor 220, the low-level sensor 220 transmits a contact signal to the control system. The control system then controls the low-level alarm 320 to issue a low-level alarm.

[0087] In addition, the ultrasonic rangefinder 500 measures the rate of descent of the asphalt level in the asphalt tank, V3, and uploads this rate to the control system. The control system processes the data V4 measured by the ultrasonic rangefinder 500 and the rate of descent of the liquid level float 400 or the sensing slider 120 measured by the ultrasonic velocimeter 800, V3. If V3 > 0, and the difference between V3 and V4 exceeds the preset range of the control system, the control system can determine that the sensitivity of the slide bar 110 has decreased. At the same time, the control system controls the solenoid valve on the spray pipe 910 to open, thereby causing the nozzle 920 to spray anthracene oil onto the portion of the slide bar 110 that extends to the cylinder 200.

[0088] When the amount of asphalt in the asphalt tank is between high and low, the control system controls the ultrasonic rangefinder 500 to perform real-time liquid level measurement, thereby obtaining the real-time liquid level height in the asphalt tank. Specifically, the ultrasonic rangefinder 500 sends an ultrasonic signal to the asphalt surface in the asphalt tank and starts timing. When the ultrasonic rangefinder 500 receives the sound wave for the first time, it stops timing and records the measured data as T. The ultrasonic rangefinder 500 calculates the relative height of the asphalt liquid surface in the asphalt tank according to H = 340·T / 2 and uploads the data to the ultrasonic rangefinder display 700 and the control system.

[0089] In addition, the ultrasonic rangefinder 500 measures and calculates the relative asphalt liquid level height at point A and point B adjacent to point A, as well as the time T from the emission to the reception of the sound wave at the corresponding point. A and T B Calculate V using the formula. AB =2(H A -H B ) / (T A -T B The data is then uploaded to the control system.

[0090] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A liquid level alarm, characterized in that, Includes a sliding assembly (100), a cylinder (200), an alarm assembly (300), a level float (400), a spray assembly (900), and a control system; The sliding assembly (100) includes a sensing slider (120) and a slider (110). The sensing slider (120) is disposed inside the cylinder (200) and connected to one end of the top of the slide rod (110). The sensing slider (120) can drive the slide rod (110) to slide inside the cylinder (200), and a contact switch is provided at the bottom of the sensing slider (120). One end of the bottom of the slide bar (110) extends to the outside of the cylinder body (200) and is connected to the liquid level float (400); The top of the cylinder (200) is provided with a high-position sensor (210) and an ultrasonic velocimeter (800), and the bottom of the cylinder (200) is connected to a low-position sensor (220). The alarm assembly (300) includes a high-level alarm (310) and a low-level alarm (320), wherein the high-level alarm (310) is connected to the high-level sensor (210) and the low-level alarm (320) is connected to the low-level sensor (220). The spray assembly (900) includes a spray pipe (910) and a nozzle (920) connected to the spray pipe (910). A solenoid valve is installed on the spray pipe (910); The nozzle (920) is positioned toward the liquid level float (400); The control system is electrically connected to the ultrasonic velocimeter (800) and the solenoid valve respectively; The liquid level alarm also includes an ultrasonic rangefinder (500). The ultrasonic rangefinder (500) is connected to the outer wall of the cylinder (200) and is used to detect the real-time liquid level; The liquid level alarm also includes a protective sleeve (600), which is disposed at the bottom of the cylinder (200). One end of the bottom of the slide rod (110) passes through the protective sleeve (600) and is connected to the liquid level float (400). The protective sleeve (600) is connected to a protective sleeve frame (610) at one end near the liquid level float (400), and the protective sleeve frame (610) is sheet-shaped. The protective sleeve (600) has a mesh structure, with pleats arranged along the circumference of the protective sleeve (600) and multiple pleats arranged along the vertical direction of the protective sleeve (600). The protective sleeve (610) is a metal structure, and the protective sleeve (610) is fixedly connected to the slide rod (110), and an anti-oil sealing ring is provided at the connection between the protective sleeve (610) and the slide rod (110).

2. The liquid level alarm according to claim 1, characterized in that, A control junction box (230) is provided on the top of the cylinder body (200); The control box (230) is electrically connected to the high-level sensor (210), the low-level sensor (220), the high-level alarm (310), and the low-level alarm (320), respectively.

3. The liquid level alarm according to claim 1, characterized in that, The cylinder body (200) is also provided with a wire groove (240) on its side wall, and the wire groove (240) is provided along the height direction of the cylinder body (200).

4. The liquid level alarm according to claim 1, characterized in that, A sealing ring is provided on the bottom surface of the cylinder (200).

5. The liquid level alarm according to claim 1, characterized in that, The liquid level buoy (400) is a hollow metal sphere.

6. A method of using a liquid level alarm, characterized in that, Applied to the liquid level alarm device according to claim 1, comprising: When injecting asphalt into the cylinder (200), activate the liquid level alarm; The first rising speed of the asphalt liquid level is obtained by the ultrasonic rangefinder (500), and the second rising speed of the liquid level float (400) or the sensing slider (120) is obtained by the ultrasonic velocimeter (800). The second rising speed is not zero. When the difference between the first rising speed and the second rising speed exceeds a preset range, the liquid level alarm is cleaned. When the asphalt level is higher than the set value of the level alarm, the level alarm will issue a high-level alarm.

7. The method of using the liquid level alarm according to claim 6, characterized in that, Also includes: When asphalt is extracted from the cylinder (200), the liquid level alarm is activated; The first descent velocity of the asphalt liquid level is obtained by an ultrasonic rangefinder (500), and the second descent velocity of the liquid level float (400) or the sensing slider (120) is obtained by an ultrasonic velocimeter (800). The second descent velocity is not zero. When the difference between the first descent speed and the second descent speed exceeds a preset range, the liquid level alarm is cleaned. When the asphalt level is lower than the set value of the level alarm, the level alarm will issue a low-level alarm.

Images