Liquid comprehensive parameter measuring instrument

Abstract

The utility model 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 directly measured in a remote mode, 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 utility model relates to industrial measurement technical field, in particular to a kind of liquid comprehensive parameter measuring instrument. BACKGROUND

[0002] In the large-scale liquid storage tank material storage and transportation industry, in order to measure the quality of transfer, the density, temperature, liquid level height, oil-water interface height and other parameters of the liquid in the storage tank need to be measured frequently. The liquid stored in the large-scale storage tank often appears density stratification and temperature stratification at different heights. 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 liquid in the whole tank.

[0003] The traditional method is to pull up the liquid sample from the tank top measurement port by a sampling cylinder, and then send the liquid to a professional laboratory for separate measurement or measurement after mixing. The sampling work is very tedious and labor-intensive, and it also produces hazardous waste liquid that needs special treatment. Therefore, people urgently hope to have an automatic remote online device that can directly measure the liquid parameters in the storage tank without manual tank climbing and without sampling before detection. SUMMARY

[0004] The utility model aims to provide a kind of liquid comprehensive parameter measuring instrument to solve the problems existing in the prior art, which can remotely and directly measure the liquid parameters in the storage tank without manual tank climbing and without sampling before detection.

[0005] To achieve the above object, the utility model provides the following scheme:

[0006] The utility model provides a kind of liquid comprehensive parameter measuring instrument, comprising:

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

[0008] The liquid parameter acquisition sensor assembly is located in the tank body and is used for acquiring and transmitting the liquid parameters in the tank body, which can automatically measure the density, temperature, liquid level, oil-water interface height and tank bottom height of the liquid in the storage tank. The liquid level measurement principle is to perceive the liquid level position through the density difference between gas and liquid. The tank bottom position detection principle is to perceive the tank bottom position by the tension change of flat cable caused by the contact of liquid parameter acquisition sensor assembly. The density measurement principle is realized by the resonant density sensor on the liquid parameter acquisition sensor.

[0009] The driving assembly is located in the cavity of the shell assembly and is connected with the liquid parameter acquisition sensor assembly through flat cable, which can control the liquid parameter acquisition sensor assembly to move up and down in the tank body through flat cable.

[0010] The utility model discloses a measuring assembly for measuring the tension and the length of up and down operation of the flat cable. The utility model has the greatest advantage in that the liquid sampling link is abandoned when the large tank is measured, and the liquid parameters in the storage tank are directly measured in real time on line without sampling, which greatly reduces the workload, avoids the trouble of storing and processing the hazardous waste liquid generated by sampling, reduces the labor intensity, reduces the environmental pollution, improves the authenticity and accuracy of measurement, has high measurement accuracy, and the measurement process is not affected by human factors and weather, and the average density can be calculated by multi-point measurement, effectively dealing with the density stratification and temperature stratification of the liquid. The utility model 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 level and other parameters, reduces the number of various single-function measuring instruments carried when the tank is filled, and conveniently realizes unified operation and management of various measurement data, greatly improving the automation, digitization and intelligence level of the user.

[0011] Optionally, the cavity in the shell assembly includes an intrinsic safety cavity and an explosion-proof cavity, the driving assembly includes a servo motor master control assembly and a power transmission assembly, the servo motor master control assembly is arranged in the explosion-proof cavity, and an external power supply is connected to the servo motor master control assembly, which is used for outputting driving force to the power transmission assembly, and the power transmission assembly is arranged in the intrinsic safety cavity and can wind the flat cable to drive the liquid parameter acquisition sensor assembly to move up and down.

[0012] Optionally, the power transmission assembly includes a magnetic coupling inner magnetic rotor, a magnetic coupling intermediate isolation cylinder and a magnetic coupling outer magnetic rotor, the magnetic coupling structure is made of neodymium iron boron + stainless steel compatible materials, the stainless steel completely wraps the neodymium iron boron from the structure, so that the purpose of protecting the neodymium iron boron from being broken by collision is achieved, the magnetic coupling inner magnetic rotor is in transmission connection with the servo motor master control assembly, a magnetic coupling outer magnetic rotor is arranged on the outer ring of the magnetic coupling inner magnetic rotor, the magnetic coupling intermediate isolation cylinder is arranged between the magnetic coupling outer magnetic rotor and the magnetic coupling inner magnetic rotor, and the flat cable is wound on the magnetic coupling outer magnetic rotor, the outer surface of the magnetic coupling outer cylinder is made of a magnetic field isolation material to prevent the magnetic field from overflowing and to prevent the magnetic field from interfering with the internal electrical signals of the flat cable wound thereon; the magnetic coupling isolation and gap explosion-proof two explosion-proof types are adopted to realize redundant explosion-proof design and improve the safety performance of the system.

[0013] Optionally, the measurement assembly comprises a flat cable length measurement assembly arranged in the intrinsically safe cavity, the flat cable length measurement assembly comprises an encoder wheel, one end of the encoder wheel is connected with an encoder, and a planar magnetic coupling is arranged between the encoder wheel and the encoder; the bottom of the encoder wheel is in frictional contact connection with the flat cable, and when the flat cable drives the liquid parameter acquisition sensor assembly to move up and down, the encoder wheel can be driven to rotate; the servo motor master control assembly drives the power transmission assembly to rotate, so that the length of the flat cable is changed, the length of the flat cable determines the height of the liquid parameter acquisition assembly below, and when the flat cable moves up and down, the flat cable drives the pulley to rotate, so that the encoder is rotated to realize length measurement.

[0014] Optionally, the measurement assembly comprises a flat cable tension detection assembly arranged in the intrinsically safe cavity, the flat cable tension detection assembly comprises a tension wheel arranged obliquely above the power transmission assembly, and a force sensor is arranged on the tension wheel; one end of the flat cable wound on the power transmission assembly passes through the tension wheel and then vertically penetrates the tank body to be connected with the liquid parameter acquisition sensor assembly; the upward tension of the flat cable and the gravity of the liquid parameter acquisition sensor assembly form a reasonable force acting on the flat cable tension detection assembly, so that tension detection is realized.

[0015] Optionally, the bottom of the shell assembly is fixedly installed at the tank top projection hole through a flange, the inside of the flange is provided with a tank top detection switch, the tank bottom position is detected by monitoring the tension change of the flat cable caused by the support force of the tank bottom, the gas-liquid interface position is redundantly detected by using the method that the liquid parameter acquisition sensor assembly detects the density difference between liquid and gas and the method that the liquid buoyancy acting on the liquid parameter acquisition sensor assembly, and the reliability is improved.

[0016] Optionally, an electrical interface assembly is arranged on one side below the shell, and the servo motor master control assembly is externally connected with a power supply through the electrical interface assembly.

[0017] Optionally, a center shaft hole is arranged at the center position of the intermediate isolation cylinder in the magnetic coupling, a center shaft is arranged at the inner center position of the outer magnetic rotor of the magnetic coupling, the center shaft is inserted into the center shaft hole to realize positioning of the outer magnetic rotor of the magnetic coupling, so that the spacing between the outer magnetic rotor and the middle isolation cylinder is uniform.

[0018] Optionally, the encoder wheel is engraved with patterns, the friction coefficient of the flat cable and the encoder wheel is increased, and the length measurement error caused by slippage of the flat cable on the encoder wheel is prevented.

[0019] Compared with the prior art, the utility model discloses the following technical effects are obtained:

[0020] The utility model discloses a remote control command equipment starts the measuring process, and when measuring, servo motor power mechanism drops liquid parameter detection sensor sensor to the inside of the storage tank liquid and measures the density, temperature, viscosity and other liquid property parameters of liquid, tank storage parameters such as liquid level, tank bottom height, oil-water interface height, its feature whole machine adopts the explosion -proof redundant design of magnetic coupling and explosion -proof, and the safety factor is high. Real -time on -line measurement and parameter monitoring are realized using remote control. The liquid parameter measurement component is accurately dropped to the specified height using the tape length measurement technology, and the measurement precision is high. The tank bottom measurement and the prevention that liquid parameter sensor is stuck detection and self -recovery are realized using the tape tension detection device, and the automation degree is high. The measuring process does not need sampling, and the artificial work load on the tank and the annoyance of hazardous waste liquid treatment are greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment, obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0022] Figure 1 It is the front view of the liquid comprehensive parameter measuring instrument of one embodiment of the utility model;

[0023] Figure 2 It is the side view of the liquid comprehensive parameter measuring instrument of one embodiment of the utility model;

[0024] Figure 3 It is the overall structure schematic view of the liquid comprehensive parameter measuring instrument of one embodiment of the utility model;

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

[0026] Clearly, the described embodiments are merely a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all the other embodiments obtained by the ordinary skilled in the art without making creative labor are within the scope of protection of the present utility model.

[0027] The utility model discloses a kind of liquid comprehensive parameter measuring instruments, to solve the problems existing in the prior art described above, can remotely directly measure liquid parameter in storage tank, without manual tank, without first sampling after detection.

[0028] To make the above-mentioned purposes, features and advantages of the present utility model more obvious and easy to understand, the present utility model will be further described in detail below with the help of drawings and specific embodiments.

[0029] The utility model provides a kind of liquid comprehensive parameter measuring instruments, as shown in Figure 1 、 Figure 2 、 Figure 3 As shown, including shell assembly 7, it is fixedly installed in the tank top stake hole place;Tank body is equipped with liquid parameter acquisition sensor assembly 4, for acquisition and transmission liquid parameter in tank body, can realize the density, temperature, liquid level, oil-water interface height, tank bottom height etc. Parameters of automatic measurement liquid in storage tank;The cavity of shell assembly 7 is equipped with driving assembly, it is connected with liquid parameter acquisition sensor assembly through flat cable, can be controlled liquid parameter acquisition sensor assembly 4 moves up and down in tank body by winding flat cable 3, to collect the parameter of different positions in tank body;To make that acquisition data is more accurate, therefore, shell assembly 7 is equipped with measuring assembly, for measuring the tension and length of running up and down of flat cable 3.

[0030] Specifically, the flat cable 3 is wound on the power transmission assembly 2 of the driving assembly, and the liquid parameter acquisition sensor assembly 4 is hung below the flat cable 3 and forms an electrical connection with the free end of the flat cable 3. The flat cable 3 is both an electrical path of the liquid parameter acquisition sensor assembly 4 and a cable for controlling the liquid parameter acquisition sensor assembly 4 at different heights. The power transmission assembly 2 rotates synchronously under the action of the magnetic coupling force, and the servo motor main control assembly 1 is externally connected to the power supply through the electrical interface assembly 8. The rotation of the power transmission assembly 2 changes the number of winding turns of the flat cable 3, thereby driving the space position of the liquid parameter acquisition sensor assembly 4 to rise and fall. The power transmission assembly 2 includes a magnetic coupling inner magnetic rotor 21, a magnetic coupling intermediate isolation cylinder 22, and a magnetic coupling outer magnetic rotor 23. The magnetic coupling structure is made of neodymium iron boron + stainless steel compatible materials. The stainless steel completely wraps the neodymium iron boron from the structure, achieving the purpose of protecting the neodymium iron boron from being knocked and broken. The magnetic coupling inner magnetic rotor 21 is in transmission connection with the servo motor main control assembly 1. The magnetic coupling outer magnetic rotor 23 is arranged outside the magnetic coupling inner magnetic rotor 21. The magnetic coupling intermediate isolation cylinder 22 is arranged between the magnetic coupling outer magnetic rotor 23 and the magnetic coupling inner magnetic rotor 21. The flat cable 3 is wound on the magnetic coupling outer magnetic rotor 23, so that the rotation of the magnetic coupling outer magnetic rotor 23 can realize the winding of the flat cable 3. The magnetic coupling transmission of power makes the explosion-proof cavity 11 of the servo motor main control assembly 1 completely isolated from the intrinsically safe cavity 10 in space, completely cutting off the dangerous explosive gas in the intrinsically safe cavity 10 from contacting the explosion-proof cavity 11 and the non-intrinsically safe electrical equipment in the explosion-proof cavity 11, thereby greatly improving the explosion-proof performance.

[0031] The measurement assembly includes a flat cable length measurement assembly 5 and a flat cable tension detection assembly 6. The flat cable 3 forms a frictional contact with the encoder wheel 52 of the flat cable length measurement assembly 5, and 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 tension wheel 61 of the flat cable tension detection assembly 6, and is wound on 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 electrical equipment that cannot realize intrinsic safety explosion protection, such as the servo motor main control assembly 1, is placed in the explosion-proof cavity 11. The rotation of the servo motor main control assembly 1 must be transmitted to the intrinsically safe cavity 10 side through the shaft hole and magnetic coupling of the power transmission assembly 2. If only the shaft hole is used for transmission, an explosion-proof gap will be formed, which has certain safety hazards. The magnetic coupling method used here completely isolates the dangerous explosive gas, greatly improving the safety factor of the system. The whole machine adopts an explosion-proof design and can be used for measuring flammable liquids.

[0032] Based on the aforementioned structure, this invention is primarily used for real-time online automatic measurement of liquid parameters in liquid storage tanks. It can directly measure liquid parameters such as density and temperature, as well as tank storage parameters such as tank height, liquid level, and oil-water interface height. Furthermore, it enables comprehensive calculation, display, storage, data transmission, and remote control of these parameters, greatly facilitating data management and integration with intelligent systems. By combining these measured parameters with IT technology to process the data, the current total liquid mass and various storage states are obtained. In use, the device needs to be fixedly installed at the metering port on the top of the tank. After receiving a remote measurement control command, the device automatically lowers the liquid parameter acquisition sensor assembly into the tank to autonomously complete various parameter measurements. The greatest advantage of this invention is that it directly measures liquid parameters through sensors, avoiding the cumbersome process of sampling and subsequent measurement, and enabling the display, storage, and wireless transmission of measurement results.

[0033] The basic principle of this utility model for liquid parameter measurement is as follows: The liquid parameter acquisition sensor assembly 4 is vertically fixed to the tank top projection hole via flange 12. It can be lowered into the tank and move freely up and down within the tank. At the start of measurement, the servo motor main control assembly 1 receives a remote control command from the host computer to initiate the measurement process. The liquid parameter acquisition sensor assembly 4, carrying density, temperature, and oil-water interface sensors, measures parameters at different depths of the liquid under the control of the servo motor main control assembly 1, and then uploads the measurement data to the servo motor main control assembly 1, which in turn uploads it to the remote software control system. The height reference point for 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 as follows: During the lowering process of the flat cable 3, the encoder wheel 52 will rotate synchronously through the planar magnetic coupling 51, thereby causing the encoder 53 to generate counting pulses. The real-time lowering length of the flat cable 3 is calculated by the system. The lowering length of the cable is measured by using a high-precision encoder instead of the number of rotations of the motor, 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 tension of the measuring tape is as follows: During operation, the flat cable 3 is subjected to two forces: 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 resultant force of these two forces acts on the tension wheel 61 and is then transmitted to the force sensor 62. After the system performs vector calculations, the tension of the measuring tape is measured. The force sensor monitors the tension of the flat cable in real time. For example, if the tension is between 50-100 grams, the flat cable 3 is considered to be vertically taut. The length of the flat cable 3 at this time, after being corrected by a fixed value (e.g., adding the height of the sensor component), is the height of the tank bottom. When the liquid parameter acquisition sensor component 4 is jammed during upward or downward movement, causing a change in the tension of the flat cable 3, the system detects this situation, immediately stops the servo motor main control component from outputting power and issues a jamming alarm, and then initiates a self-rescue procedure to free the liquid parameter acquisition sensor component from the jamming device for subsequent maintenance.

[0036] This invention utilizes a bottom-up measurement method for the oil-water interface, unlike traditional liquid level measurement which measures the empty height from the top of the tank and then subtracts the empty height from the total height. The advantage of measuring the oil-water interface height from the bottom is improved accuracy. Typically, the water at the bottom of the tank is used to level the tank for easier measurement of upper-layer oil and other organic liquids, so the water level is very shallow, usually only a few centimeters. However, most storage tanks have a total height of over 15 meters. Therefore, the cable travels several meters when measuring the oil-water interface from the top down, compared to only a few centimeters when measuring from the bottom up. The greater the travel distance, the greater the cumulative error. Therefore, the bottom-up measurement method reduces the introduction of cumulative error, significantly improving measurement accuracy.

[0037] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A liquid comprehensive parameter measuring instrument, characterized in that, The application relates to a liquid parameter acquisition device for a tank, which comprises the following components: a shell assembly fixedly installed at a tank top ruler hole; a liquid parameter acquisition sensor assembly located in a tank body and used for acquiring and transmitting liquid parameters in the tank body; a driving assembly located in a cavity of the shell assembly, connected with the liquid parameter acquisition sensor assembly through a flat cable, and capable of controlling the liquid parameter acquisition sensor assembly to move up and down in the tank body through the flat cable; a measuring assembly used for measuring the tension and length of up-and-down operation of the flat cable.

2. The liquid comprehensive parameter measuring instrument according to claim 1, characterized in that, The cavity in the shell assembly comprises an explosion-proof cavity, the driving assembly comprises a servo motor master control assembly and a power transmission assembly, the servo motor master control assembly is arranged in the explosion-proof cavity, and an external power supply is connected to the servo motor master control assembly and used 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 further comprises an intrinsic safety cavity, the power transmission assembly is arranged in the intrinsic safety cavity and can wind 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 assembly comprises a magnetic coupling inner magnetic rotor, a magnetic coupling intermediate isolation cylinder and a magnetic coupling outer magnetic rotor, the magnetic coupling inner magnetic rotor is in transmission connection with the servo motor master control assembly, a magnetic coupling outer magnetic rotor is arranged on the outer ring of the magnetic coupling inner magnetic rotor, the magnetic coupling intermediate isolation cylinder is arranged between the magnetic coupling outer magnetic rotor and the magnetic coupling inner magnetic rotor, and the flat cable is wound on the magnetic coupling outer magnetic rotor.

5. The liquid comprehensive parameter measuring instrument according to claim 3, characterized in that, The measuring assembly comprises a flat cable length measuring assembly arranged in the intrinsic safety cavity, the flat cable length measuring assembly comprises an encoder wheel, one end of the encoder wheel is connected with an encoder, a planar magnetic coupling is arranged between the encoder wheel and the encoder, the bottom of the encoder wheel is in frictional contact connection with the flat cable, and the flat cable drives the encoder wheel to rotate when driving the liquid parameter acquisition sensor assembly to move up and down.

6. The liquid comprehensive parameter measuring instrument according to claim 3, characterized in that, The measuring assembly comprises a flat cable tension detection assembly arranged in the intrinsic safety cavity, the flat cable tension detection assembly comprises a tension wheel arranged obliquely above the power transmission assembly, a force sensor is arranged on the tension wheel, and one end of the flat cable wound on the power transmission assembly passes through the tension wheel and vertically penetrates downwards to be connected with the liquid parameter acquisition sensor assembly.

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 ruler hole through a flange, and a tank top detection switch is arranged in the flange.

8. The liquid comprehensive parameter measuring instrument according to claim 3, characterized in that, An electrical interface assembly is arranged on one side below the shell, and the servo motor master control assembly is externally connected with a power supply through the electrical interface assembly.

9. The liquid comprehensive parameter measuring instrument according to claim 4, characterized in that, A center shaft hole is arranged at the center position of the magnetic coupling intermediate isolation cylinder, a center shaft is arranged at the center position in the magnetic coupling outer magnetic rotor, and the center shaft is inserted into the center shaft hole to realize 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 is engraved with patterns.

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