Liquid comprehensive parameter measuring instrument

Abstract

The invention discloses a liquid comprehensive parameter measuring instrument, and relates to the technical field of industrial metering. Comprising a shell assembly which is fixedly installed at a scale casting hole in the top of a tank; the liquid parameter acquisition sensor assembly is positioned in the tank body and is used for acquiring and transmitting liquid parameters in the tank body; the driving assembly is located in the cavity of the shell assembly, is connected with the liquid parameter acquisition sensor assembly through a flat cable, and can control the liquid parameter acquisition sensor assembly to move up and down in the tank body through the flat cable; and the measuring assembly is used for measuring the tension and the up-and-down running length of the flat cable. According to the liquid comprehensive parameter measuring instrument, parameters of liquid in a storage tank can be remotely and directly measured, manual tank loading is not needed, sampling and detection are not needed in sequence, the automation degree is high, and the workload of manual tank loading and the trouble of hazardous waste liquid treatment are greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of industrial measurement, and in particular to a liquid comprehensive parameter measuring instrument. Background Art

[0002] In the material storage and transportation industry of large liquid storage tanks, in order to measure the transfer quality, it is necessary to frequently measure the density, temperature, liquid level, oil-water interface height and other parameters of the liquid in the tank. Liquids stored in large tanks often have density stratification and temperature stratification in height. In order to make the measurement more accurate, it is necessary to measure the liquid parameters at different depths multiple times, and then calculate the average value of each parameter to calculate the mass of the entire tank of liquid.

[0003] The traditional method is to pull the liquid sample from the top of the tank into the tank through the sampling tube, and then send the liquid to a professional laboratory for separate measurement or mixed measurement. The sampling work is very cumbersome and labor-intensive, and it also produces hazardous waste liquid that requires special treatment. Therefore, people are eager to have an automatic remote online device that can directly measure the liquid parameters in the storage tank without manual tank loading and sampling before testing. Summary of the invention

[0004] The purpose of the present invention is to provide a liquid comprehensive parameter measuring instrument to solve the problems existing in the above-mentioned prior art, which can directly measure the liquid parameters in the storage tank remotely without the need for manual tank loading and sampling before testing.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a liquid comprehensive parameter measuring instrument, comprising:

[0007] The shell assembly is fixedly installed at the casting hole on the tank top;

[0008] The liquid parameter acquisition sensor component is located in the tank body and is used to collect and transmit the liquid parameters in the tank body. It can automatically measure the density, temperature, liquid level, oil-water interface height, tank bottom height and other parameters of the liquid in the tank. The liquid level measurement principle is to sense the liquid surface position through the density difference between gas and liquid. The tank bottom position detection principle is to sense the tank bottom position through the change in the tension of the flat cable caused by the liquid parameter acquisition sensor component touching the bottom. The density measurement principle is realized through the resonant density sensor on the liquid parameter acquisition sensor.

[0009] A driving assembly, located in the cavity of the housing assembly, connected to the liquid parameter acquisition sensor assembly via a flat cable, and capable of controlling the liquid parameter acquisition sensor assembly to move up and down in the tank body via the flat cable;

[0010] The measuring component is used to measure the tension of the flat cable and the length of the up and down running. The greatest benefit of the present invention is that the liquid sampling link is abandoned during the measurement of large tanks, and the real-time online measurement of the liquid parameters in the storage tank is realized without sampling. This greatly reduces the workload, avoids the trouble of storing and handling the hazardous waste liquids generated by sampling, reduces labor intensity, reduces environmental pollution, and improves the authenticity and accuracy of the measurement; its measurement accuracy is high, the measurement process is not affected by human and weather, and it can realize multi-point measurement and calculation of average density, effectively dealing with the density stratification and temperature stratification of liquids. The present invention integrates the measurement of liquid parameters such as density, temperature and other parameters and the measurement of tank storage parameters such as liquid level, tank height, water height and other parameters, reduces the number of various single-function measuring instruments carried by the upper tank, and facilitates the unified calculation and management of multiple measurement data, greatly improving the automation, digitization and intelligence level of the user unit.

[0011] Optionally, the cavity within the shell assembly includes an intrinsically safe cavity and an explosion-proof cavity, and the drive assembly includes a servo motor main control assembly and a power transmission assembly. The servo motor main control assembly is arranged in the explosion-proof cavity and is externally connected to a power supply for outputting driving force to the power transmission assembly. The power transmission assembly is arranged in the intrinsically safe cavity and can be wound around the flat cable, thereby driving the liquid parameter acquisition sensor assembly to move up and down.

[0012] Optionally, the power transmission component includes a magnetically coupled inner magnetic rotor, a magnetically coupled intermediate isolation cylinder and a magnetically coupled outer magnetic rotor. The magnetic coupling structure is made of a composite material of NdFeB + stainless steel. Structurally, the stainless steel completely wraps the NdFeB to protect the NdFeB from bumps and breakage. The magnetically coupled inner magnetic rotor is transmission-connected to the servo motor main control component. The outer ring of the magnetically coupled inner magnetic rotor is provided with a magnetically coupled outer magnetic rotor. The magnetically coupled intermediate isolation cylinder is provided between the magnetically coupled outer magnetic rotor and the magnetically coupled inner magnetic rotor. The flat cable is wound around the magnetically coupled outer magnetic rotor. The outer surface of the magnetically coupled outer cylinder adopts magnetic field isolation material to prevent magnetic field overflow, so as to prevent magnetic field overflow from interfering with internal electrical signals of the flat cable wound thereon. Two explosion-proof types, magnetic coupling isolation and gap explosion-proof, are adopted to realize redundant explosion-proof design and improve system safety performance.

[0013] Optionally, the measuring component includes a flat cable length measuring component arranged in the intrinsically safe cavity, the flat cable length measuring component includes an encoder wheel, one end of the encoder wheel is connected to an encoder, and a planar magnetic coupling is provided between the encoder wheel and the encoder; the bottom of the encoder wheel is frictionally contacted and connected to the flat cable, and when the flat cable drives the liquid parameter acquisition sensor component to move up and down, it can drive the encoder wheel to rotate; the servo motor main control component drives the power transmission component to rotate, thereby changing the retracted length of the flat cable, the retracted length of the flat cable determines the height of the liquid parameter acquisition component below it, and when the flat cable moves up and down, it will drive the pulley to rotate, thereby driving the encoder to rotate to achieve length measurement.

[0014] Optionally, the measuring component includes a flat cable tension detection component arranged in the intrinsically safe cavity, the flat cable tension detection component includes a tension wheel arranged obliquely above the power transmission component, and the tension wheel is provided with a force sensor; one end of the flat cable wrapped around the power transmission component passes around the tension wheel and then vertically downward through the tank body and is connected to the liquid parameter acquisition sensor component; the upward pulling force of the flat cable and the gravity of the liquid parameter acquisition sensor component itself form a reasonable effect on the flat cable tension detection component to achieve tension detection.

[0015] Optionally, the bottom of the shell assembly is fixedly installed at the casting hole on the tank top through a flange, and a tank top detection switch is provided inside the flange. The tank bottom position is detected by monitoring the tension change on the flat cable caused by the supporting force of the tank bottom. The position of the gas-liquid interface is redundantly detected by using two methods: a method of detecting the density difference between liquid and gas using a liquid parameter acquisition sensor assembly and the liquid buoyancy exerted on the liquid parameter acquisition sensor assembly itself, thereby improving reliability.

[0016] Optionally, an electrical interface component is provided on one side below the shell, and the servo motor main control component is externally connected to a power source through the electrical interface component.

[0017] Optionally, a central axis hole is provided at the center position of the magnetically coupled intermediate isolation cylinder, and a central axis is provided at the center position inside the magnetically coupled outer magnetic rotor. The central axis is inserted into the central axis hole to realize the positioning of the magnetically coupled outer magnetic rotor, thereby ensuring that the spacing between the outer magnetic rotor and the intermediate isolation cylinder quality inspection circle is uniform.

[0018] Optionally, a pattern is etched on the encoder wheel to increase the friction coefficient between the flat cable and the encoder wheel, thereby preventing the flat cable from slipping on the encoder wheel and causing length measurement errors.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The present invention starts the measurement process through a remote control command device. During the measurement, the servo motor power mechanism lowers the liquid parameter detection sensor into the liquid in the storage tank to measure the liquid property parameters such as liquid density, temperature, viscosity, and tank storage parameters such as liquid level, tank bottom height, and oil-water interface height. Its characteristics are that the whole machine adopts an explosion-proof redundant design that uses both magnetic coupling and explosion-proof, and has a high safety factor. Remote control is used to achieve real-time online measurement and parameter monitoring. The tape length measurement technology is used to accurately place the liquid parameter measurement component to the specified height, with high measurement accuracy. The tape tension detection device is used to achieve tank bottom measurement and prevent the liquid parameter sensor from being stuck and self-recovering, with a high degree of automation. No sampling is required during the measurement process, which greatly reduces the workload of manual tank loading and the trouble of hazardous waste liquid treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention 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 of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A front view of a liquid comprehensive parameter measuring instrument according to one embodiment of the present invention;

[0023] Figure 2 A side view of a liquid comprehensive parameter measuring instrument according to one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the overall structure of a liquid comprehensive parameter measuring instrument according to one embodiment of the present invention;

[0025] In the figure: 1-servo motor main control component, 2-power transmission component, 21-magnetically coupled inner magnetic rotor, 22-magnetically coupled intermediate isolation cylinder, 23-magnetically coupled outer magnetic rotor, 3-flat cable, 4-liquid parameter acquisition sensor component, 5-flat cable length measurement component, 51-planar magnetic coupling, 52-encoder wheel, 53-encoder, 6-flat cable tension detection component, 61-tension wheel, 62-force sensor, 7-housing component, 8-electrical interface component, 9-tank top detection switch, 10-intrinsically safe cavity, 11-explosion-proof cavity, 12-flange. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide a liquid comprehensive parameter measuring instrument to solve the problems existing in the above-mentioned prior art, which can directly measure the liquid parameters in the storage tank remotely without the need for manual tank loading and sampling before testing.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The present invention provides a liquid comprehensive parameter measuring instrument, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes a shell component 7, which is fixedly installed at the projection hole on the top of the tank; a liquid parameter acquisition sensor component 4 is provided in the tank body, which is used to collect and transmit the liquid parameters in the tank body, and can realize automatic measurement of the density, temperature, liquid level, oil-water interface height, tank bottom height and other parameters of the liquid in the storage tank; a driving component is provided in the cavity of the shell component 7, which is connected to the liquid parameter acquisition sensor component through a flat cable, and can control the liquid parameter acquisition sensor component 4 to move up and down in the tank body by winding the flat cable 3, so as to collect parameters at different positions in the tank body; in order to make the collected data more accurate, a measuring component is provided in the shell component 7, which is used to measure the tension of the flat cable 3 and the length of the up and down movement.

[0030] Specifically, the flat cable 3 is wound around the power transmission component 2 of the driving component, and the liquid parameter acquisition sensor component 4 is suspended below the flat cable 3 and electrically connected to the free end of the flat cable 3. The flat cable 3 is both an electrical path for the liquid parameter acquisition sensor component 4 and a cable for controlling the liquid parameter acquisition sensor component 4 at different heights. The power transmission component 2 rotates synchronously with the servo motor main control component 1 under the action of the magnetic coupling force, and the servo motor main control component 1 is connected to an external power supply through the electrical interface component 8. The rotation of the power transmission component 2 will change the number of windings of the flat cable 3, thereby driving the rise and fall of the spatial position of the liquid parameter acquisition sensor component 4; the power transmission component 2 includes a magnetically coupled inner magnetic rotor 21, a magnetically coupled intermediate isolation cylinder 22 and a magnetically coupled outer magnetic rotor 23. The magnetic coupling structure is made of a composite material of NdFeB + stainless steel. From a structural point of view, stainless steel completely wraps the NdFeB to protect the NdFeB from bumps and breakage. The magnetically coupled inner magnetic rotor 21 is connected to the servo motor main control component 1 in a transmission manner, and the outer ring of the magnetically coupled inner magnetic rotor 21 is provided with a magnetically coupled outer magnetic rotor. The rotor 23, a magnetically coupled intermediate isolation cylinder 22 is provided between the magnetically coupled outer magnetic rotor 23 and the magnetically coupled inner magnetic rotor 21, and the flat cable 3 is wound on the magnetically coupled outer magnetic rotor 23, so that the rotation of the magnetically coupled outer magnetic rotor 23 can realize the winding of the flat cable 3, and the magnetic coupling is used to transmit power, which makes the explosion-proof chamber 11 where the servo motor main control component 1 is located and the intrinsically safe chamber 10 completely isolated in space, and completely isolates the dangerous explosive gas in the intrinsically safe chamber 10 from entering the explosion-proof chamber 11 and contacting the non-intrinsically safe electrical equipment in the explosion-proof chamber 11, thereby greatly improving the explosion-proof performance.

[0031] The measuring assembly includes a flat cable length measuring assembly 5 and a flat cable tension detection assembly 6. The flat cable 3 forms friction contact with the encoder wheel 52 of the flat cable length measuring assembly 5. The flat cable 3 drives the encoder wheel 52 to rotate forward or reverse synchronously while running up and down. The flat cable 3 forms a supporting contact with the flat cable tension detection assembly 6 through the tension wheel 61, which is wound around the tension wheel 61. All or part of the tension on the flat cable 3 is applied to the force sensor 62 through the tension wheel 61. The servo motor main control assembly 1 and other electrical equipment that cannot achieve intrinsic safety and explosion-proof are placed in the flameproof chamber 11. The rotation of the servo motor main control assembly 1 must be transmitted to the side of the intrinsic safety chamber 10 through the shaft hole and magnetic coupling via the power transmission assembly 2. If only the shaft hole conduction is used, an explosion-proof gap will be formed, which poses certain safety hazards. The magnetic coupling method is used here to completely isolate the dangerous explosive gas, which greatly improves the safety factor of the system. The whole machine adopts an explosion-proof design and can be used for the measurement of flammable liquids.

[0032] Based on the above structure, the present invention is mainly used for real-time online automatic measurement of liquid parameters in liquid storage tanks. It can directly measure liquid parameters such as liquid density and temperature, as well as tank storage parameters such as tank height, liquid level, and oil-water interface height, and can realize comprehensive calculation, display, storage, data transmission, remote control and other operations of these parameters, which greatly facilitates data management and intelligent system docking. The current total mass of the liquid and various storage states are obtained after data processing by combining these measured parameters with IT technology. When the present invention is used, the equipment needs to be fixedly installed at the metering port on the top of the tank. After receiving the remote measurement control command, the device of the present invention automatically puts the liquid parameter acquisition sensor assembly 4 into the storage tank to independently complete various parameter measurements. The biggest advantage of the present invention is that the liquid parameters are directly measured by the sensor, which avoids the tediousness of sampling and then measuring, and can realize the display, storage and wireless transmission of measurement results.

[0033] The basic principle of the liquid parameter measurement of the present invention is: the liquid parameter acquisition sensor assembly 4 can be placed in the tank body and can move freely up and down in the tank body by vertically fixing it at the projection hole on the tank top through the flange 12. At the beginning of the measurement, the servo motor main control assembly 1 receives the remote control command of the host computer to start the measurement process. The liquid parameter acquisition sensor assembly 4 carries density, temperature, and oil-water interface sensors to measure the parameters of the liquid at different depths under the control of the servo motor main control assembly 1, and tries to upload the measurement data to the servo motor main control assembly 1, and then upload it to the remote software control system. The height reference point of the liquid parameter acquisition sensor assembly 4 is the tank top detection switch 9.

[0034] The working principle of the flat cable length measuring component 5 is: during the lowering process of the flat cable 3, the encoder wheel 52 will be driven to rotate synchronously through the planar magnetic coupling 51, thereby causing the encoder 53 to generate a counting pulse. The real-time lowering length of the flat cable 3 is calculated by the system, and a high-precision encoder is used instead of the number of rotations of the motor to measure the lowering length of the cable, so that the cable length measurement is accurate to ±2mm, which greatly improves the positioning accuracy of the sensor component and makes the measurement more rigorous.

[0035] The working principle of the flat cable tension detection component 6 for detecting the tape tension is: when working, the flat cable 3 is acted upon by the tension transmitted by the servo motor main control component 1 and the tension generated by the gravity of the liquid parameter acquisition sensor component below. The combined force of these two forces acts on the tension wheel 61 and then is transmitted to the force sensor 62. After the system's opposite vector operation, the tape tension is measured. The force sensor is used to monitor the flat cable tension in real time. For example, between 50 grams of force and 100 grams of force, the flat cable 3 is considered to be vertically tightened. At this time, the lowered length of the flat cable 3 is corrected by a fixed value (for example, adding the height of the sensor component, etc.) to be the tank bottom height. When the liquid parameter acquisition sensor component 4 is stuck in the upward or downward direction, the tension of the flat cable 3 changes. When the system detects this situation, it will immediately stop the servo motor main control component from continuing to output power and issue a stuck alarm, and then start the self-rescue program to get the liquid parameter acquisition sensor component out of the North Card for subsequent maintenance.

[0036] The oil-water interface measurement of the device of the present invention adopts the method of measuring from the bottom of the tank upwards, which is different from the method of measuring the empty height from the top of the tank downwards during liquid level measurement, and then measuring the liquid level by subtracting the empty height from the total height. The advantage of measuring the oil-water interface height from the bottom of the tank upwards is that the accuracy of the measurement is improved. Because the water at the bottom of the tank is generally used to level the bottom of the tank to facilitate the measurement of organic liquids such as the upper oil, the water is very shallow, generally only a few centimeters, and the total height of most storage tanks is more than 15 meters. It can be seen that the distance traveled by the cable for measuring the oil-water interface from the top of the tank downwards is more than ten meters, while the distance traveled by the cable for measuring the oil-water interface from the bottom of the tank upwards is only a few centimeters. The greater the distance, the greater the cumulative error. Therefore, the method of measuring from the bottom of the tank upwards reduces the introduction of cumulative errors and greatly improves the accuracy of the measurement.

[0037] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A liquid comprehensive parameter measuring instrument, characterized in that: include: The shell assembly is fixedly installed at the casting hole on the tank top; The liquid parameter acquisition sensor assembly is located in the tank body and is used to collect and transmit the liquid parameters in the tank body; A driving assembly, located in the cavity of the housing assembly, connected to the liquid parameter acquisition sensor assembly via a flat cable, and capable of controlling the liquid parameter acquisition sensor assembly to move up and down in the tank body via the flat cable; Measuring assembly for measuring the tension and up and down running length of the flat cable.

2. The liquid comprehensive parameter measuring instrument according to claim 1, characterized in that: The cavity in the shell assembly includes an explosion-proof cavity, and the drive assembly includes a servo motor main control assembly and a power transmission assembly. The servo motor main control assembly is arranged in the explosion-proof cavity and is externally connected to a power supply for outputting driving force to the power transmission assembly.

3. The liquid comprehensive parameter measuring instrument according to claim 2, characterized in that: The cavity in the shell assembly also includes an intrinsically safe cavity. The power transmission assembly is arranged in the intrinsically safe cavity and can be wound around the flat cable to drive the liquid parameter acquisition sensor assembly to move up and down.

4. The liquid comprehensive parameter measuring instrument according to claim 3, characterized in that: The power transmission component includes a magnetically coupled inner magnetic rotor, a magnetically coupled intermediate isolation cylinder and a magnetically coupled outer magnetic rotor. The magnetically coupled inner magnetic rotor is transmission-connected to the servo motor main control component. The outer ring of the magnetically coupled inner magnetic rotor is provided with a magnetically coupled outer magnetic rotor. The magnetically coupled intermediate isolation cylinder is provided between the magnetically coupled outer magnetic rotor and the magnetically coupled inner magnetic rotor. The flat cable is wound around the magnetically coupled outer magnetic rotor.

5. The liquid comprehensive parameter measuring instrument according to claim 3, characterized in that: The measuring component includes a flat cable length measuring component arranged in an intrinsically safe cavity, the flat cable length measuring component includes an encoder wheel, one end of the encoder wheel is connected to an encoder, and a planar magnetic coupling is provided between the encoder wheel and the encoder; the bottom of the encoder wheel is frictionally contacted with the flat cable, and when the flat cable drives the liquid parameter acquisition sensor component to move up and down, it can drive the encoder wheel to rotate.

6. The liquid comprehensive parameter measuring instrument according to claim 3, characterized in that: The measuring component includes a flat cable tension detection component arranged in an intrinsically safe cavity, and the flat cable tension detection component includes a tension wheel arranged obliquely above the power transmission component, and a force sensor is provided on the tension wheel; one end of the flat cable wound on the power transmission component passes around the tension wheel and then vertically downward through the tank body to be connected to the liquid parameter acquisition sensor component.

7. The liquid comprehensive parameter measuring instrument according to claim 1, characterized in that: The bottom of the shell assembly is fixedly installed at the tank top projection hole through a flange, and a tank top detection switch is arranged inside the flange.

8. The liquid comprehensive parameter measuring instrument according to claim 3, characterized in that: An electrical interface component is provided on one side below the shell, and the servo motor main control component is externally connected to a power source through the electrical interface component.

9. The liquid comprehensive parameter measuring instrument according to claim 4, characterized in that: A central axis hole is provided at the center of the magnetic coupling intermediate isolation cylinder, a central axis is provided at the center of the magnetic coupling outer magnetic rotor, and the central axis is inserted into the central axis hole to realize the positioning of the magnetic coupling outer magnetic rotor.

10. The liquid comprehensive parameter measuring instrument according to claim 5, characterized in that: The encoder wheel has a pattern etched thereon.

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