CN112050075A - Low-temperature liquid filling amount control device and filling method thereof - Google Patents

Low-temperature liquid filling amount control device and filling method thereof Download PDF

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Publication number
CN112050075A
CN112050075A CN202010825239.8A CN202010825239A CN112050075A CN 112050075 A CN112050075 A CN 112050075A CN 202010825239 A CN202010825239 A CN 202010825239A CN 112050075 A CN112050075 A CN 112050075A
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tank car
load
strain sensor
vehicle
strain
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CN202010825239.8A
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CN112050075B (en
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章琳
袁士豪
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Hangzhou Dianzi University
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Hangzhou Dianzi University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/005—Details of vessels or of the filling or discharging of vessels for medium-size and small storage vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/023—Special adaptations of indicating, measuring, or monitoring equipment having the mass as the parameter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/032—Orientation with substantially vertical main axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/054—Size medium (>1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/032—Control means using computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/034—Control means using wireless transmissions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0421—Mass or weight of the content of the vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/063—Fluid distribution for supply of refueling stations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
    • F17C2270/0171—Trucks

Abstract

The invention relates to a low-temperature liquid filling amount control device and a filling method thereof. According to the method, the actual loading capacity of the low-temperature liquid tank car is obtained by measuring the strain of the main shaft of the low-temperature liquid tank car and combining the levelness detection of the main shaft. By utilizing the characteristic that the strain of a transmission shaft of the cryogenic liquid tanker is in a linear relation with the external bearing in the elastic deformation range, a strain sensor is arranged near the joint part of the transmission shaft of the cryogenic liquid tanker and a tire, and the strain sensor can measure the strain of a main transmission shaft of the cryogenic liquid tanker, wirelessly transmit data back to a receiving terminal and quickly and accurately measure the loading capacity of the cryogenic liquid tanker. Different from the conventional low-temperature liquid tank car weighing method, the low-temperature liquid tank car weighing method can reduce the moving space of the low-temperature liquid tank car in a liquid filling field, save the wagon balance setting space of the liquid filling field and improve the space utilization efficiency of the liquid filling field.

Description

Low-temperature liquid filling amount control device and filling method thereof
Technical Field
The invention belongs to the technical field of low-temperature liquid weighing, and relates to a low-temperature liquid filling amount control device of a low-temperature liquid tank car and a filling method thereof.
Background
At present, the filling amount control of the mainstream cryogenic liquid is realized by means of wagon balance, the cryogenic liquid is mainly transported by means of a cryogenic liquid tanker in industry, and the cryogenic liquid tanker is taken as an example for illustration but not limited to the cryogenic liquid tanker. The low-temperature liquid tank wagon needs to enter a weighbridge area in advance after entering a liquid filling area, the empty wagon is weighed, then the low-temperature liquid tank wagon enters the liquid filling area, and after liquid filling is finished, the low-temperature liquid tank wagon returns to the weighbridge weighing area, and the actual loading capacity is weighed. The whole filling process consumes more time on tank car weighing, and then because need come and go filling area and weighbridge area of weighing many times, because general liquid filling area occupation of land can not be very big, lead to the cryogenic liquids tank car to have a great deal of inconvenience between come and go filling area and weighbridge area of weighing, influence filling efficiency. During periods of busy filling, congestion may even occur. In order to improve the filling efficiency of the low-temperature liquid tank wagon, the weighing time of the tank wagon before and after liquid filling is shortened, a large-scale real-time weighing system of the low-temperature liquid tank wagon needs to be developed, and real-time weighing in the liquid filling process is realized.
Disclosure of Invention
The invention aims to provide a low-temperature liquid filling amount control device and a filling method thereof, which are used for measuring the main shaft strain of a large-scale low-temperature liquid tank car (not limited to the large-scale low-temperature liquid tank car) and combining the main shaft levelness detection to obtain the actual loading amount of the low-temperature liquid tank car.
By utilizing the characteristic that the strain of a transmission shaft of the cryogenic liquid tanker is in a linear relation with the external bearing in the elastic deformation range, a strain sensor is arranged near the joint part of the transmission shaft and the tire of the large cryogenic liquid tanker, and the strain sensor can measure the strain of a main transmission shaft of the large cryogenic liquid tanker and wirelessly transmit data to a receiving terminal (a desktop computer, a handheld portable computer and the like), so that the loading capacity of the cryogenic liquid tanker can be measured quickly and accurately. The weighing method (weighbridge) of the low-temperature liquid tank car is different from that of the conventional low-temperature liquid tank car, so that the moving space of the low-temperature liquid tank car in a liquid filling field can be reduced, the weighbridge setting space of the liquid filling field can be saved, and the space utilization efficiency of the liquid filling field can be improved. The device is suitable for but not limited to large cryogenic liquid tank cars.
A low-temperature liquid filling amount control device comprises a strain sensor, a strain gauge, a signal amplifier, a data memory, a wireless transmitting device, a data resolver, a vehicle-mounted load display device, a portable terminal, liquid filling control indoor equipment, a horizontal test bed, a tank car levelness detector and a wireless signal receiver; the horizontal test bed is horizontally arranged on the ground, and the middle part of the horizontal test bed is provided with a rotating shaft which can rotate along the rotating shaft; a tank car fixing device is arranged on the horizontal test bed; the strain sensor and the strain gauge are coaxially arranged on the side, close to the wheel, of the wheel spindle, and the strain sensor is electrically connected with the strain gauge; the strain sensor is used for receiving and transmitting a voltage signal of the strain gauge, and the strain gauge is used for measuring the elastic deformation of the main shaft caused by bearing the load of the vehicle; the tank car levelness detector is coaxially installed with the strain sensor and the strain gauge, is axially staggered with the strain sensor and the strain gauge and is used for detecting a horizontal inclination angle of a vehicle and the ground contacted with the vehicle; the strain sensor is electrically connected with the data memory through the signal amplifier, and the data of the strain sensor is transmitted to the data memory through the signal amplifier; the tank car levelness detector is wirelessly connected with the data solver and the wireless signal receiver and transmits a horizontal inclination angle measurement signal of the ground contacted by the tank car to the data solver and the wireless signal receiver;
the data memory is electrically connected with the wireless transmitting device, and the wireless transmitting device converts the stored data into a wireless signal; the wireless transmitting device is electrically connected with the data resolver and the wireless signal receiver, the wireless signal receiver is electrically connected with the portable terminal and the liquid filling control indoor equipment, and the wireless signal receiver downloads data to the portable terminal and the liquid filling control indoor equipment after receiving signals; and the vehicle-mounted load display device is electrically connected with the data resolver and is used for displaying the liquid filling amount in the storage tank of the low-temperature liquid tank car.
Furthermore, the levelness detector of the tank car is axially staggered by 50-70 cm from the strain gauge and the strain sensor.
Furthermore, the liquid filling control indoor equipment comprises a data printer and a terminal computer.
The cryogenic liquid filling method for the device comprises the following steps:
firstly, in a horizontal state, a strain sensor and a tank car levelness detector are calibrated, so that a strain calibration zero point and a levelness detection calibration zero point are enabled;
step 1.1, the table top of a horizontal test table is required to be adjusted to a horizontal position, then a tank car to be injected is driven to the table top of the horizontal test table and is fixedly seen, and at the moment, the low-temperature liquid tank car is located at the horizontal position; checking whether the levelness detector of the tank car is positioned at the zero point, if not, adjusting the levelness detector of the tank car to enable levelness detection to calibrate the zero point; then checking the vehicle no-load fed back by the strain sensor and recording;
the accuracy of the numerical value can not be determined by the empty load of the tank car, and the accuracy of the numerical value needs to be verified in the subsequent steps;
step 1.2, slowly increasing the standard mass step by step above the gravity center of the low-temperature liquid tank car after the levelness detector of the tank car detects and calibrates a zero point; recording the vehicle load reading fed back by the corresponding strain sensor every time the first-level standard mass is added until the specified load capacity of the low-temperature liquid tank vehicle is reached;
step 1.3, observing whether the difference value of the vehicle load and the no-load fed back by the strain sensor is the added standard mass weight or not under different load levels; if so, the vehicle no-load fed back by the strain sensor is correct, and the vehicle-mounted load display device displays a zero point at the moment; if not, displaying and compensating the difference between the difference value of the vehicle load and the no-load fed back by the strain sensor and the added standard mass weight, and manually adjusting the vehicle-mounted load display device to display a zero point;
step 1.4, slowly removing the applied standard mass step by step, and correspondingly recording the vehicle load reading fed back by the strain sensor every time when the applied standard mass is removed by one step until all the applied standard mass is removed; observing the recorded data, and judging whether the difference value between the vehicle load and the no-load fed back by the strain sensor is the added standard mass weight or not; if so, indicating that the zero point displayed by the vehicle-mounted load display device is correct; if not, displaying and compensating the difference between the difference value of the vehicle load and the no-load fed back by the strain sensor and the added standard mass weight, and manually adjusting the vehicle-mounted load display device to display a zero point;
step 1.5, after the applied standard quality is completely removed, the display reading of the levelness detector of the tank car needs to be checked again, and if the display reading is zero, the levelness detection calibration zero point in the step 1.1 is correct; if not, repeating the step 1.1 again, repeating the step 1.2 to the step 1.4 until the vehicle load and the tank car levelness detector fed back by the strain sensor displays correct zero points, namely a strain calibration zero point and a levelness detection calibration zero point;
step two, after the adjustment of the horizontal state in the step one is finished, the strain sensor and the tank car levelness detector in the inclined plane state are adjusted;
step 2.1, slowly rotating the table top of the horizontal test bed in a vertical plane under the condition of no-load of the low-temperature liquid tank car until the table top forms an angle of 15-20 degrees with the horizontal direction, observing the reading displayed by the strain sensor and the tank car levelness detector at the moment, and if the strain sensor displays zero and the tank car levelness detector displays the actual rotation degree of the horizontal test bed, indicating that the zero point adjustment of the strain sensor and the tank car levelness detector is finished; if one of the two is displayed inaccurately, the first step needs to be repeated;
step 2.2, applying standard mass in the vertical direction to the low-temperature liquid tank car, and slowly increasing the standard mass step by step above the gravity center of the low-temperature liquid tank car; when the first-level standard mass is added, recording the reading of the vehicle load fed back by the corresponding strain sensor until the specified load capacity of the low-temperature liquid tank vehicle is reached, observing whether the difference value between the vehicle load fed back by the strain sensor and the no-load is the added standard mass weight or not under different load levels, and if so, judging that the no-load of the vehicle fed back by the strain sensor under the inclined plane condition is correct; if not, repeating the step one and the step 2.1;
2.3, slowly removing the standard mass in the vertical direction step by step, and correspondingly recording the vehicle load reading fed back by the strain sensor every time when the standard mass is removed by one step until all the applied standard mass is removed; observing the recorded data, and judging whether the difference value between the vehicle load and the no-load fed back by the strain sensor is the added standard mass weight or not; if so, indicating that the empty load and the load of the vehicle fed back by the strain sensor under the inclined plane condition are correct; if not, repeating the step one, the step 2.1 and the step 2.2;
thirdly, after the strain sensor and the tank car levelness detector are calibrated, weighing the load of the low-temperature liquid tank car to be injected; the tank car enters a filling area, and liquid filling is carried out on the low-temperature liquid tank car through a filling flow path; the strain gauge measures the strain of the axle caused by the liquid loading weight along with the liquid entering the liquid storage tank of the tank car, and transmits the measured data to the strain sensor;
transmitting the strain data to a data memory by the strain sensor through a signal amplifier in real time; data stored in the data memory is converted into wireless signals through a wireless transmitting device and respectively transmitted to a wireless signal receiver and a data resolver; the tank car levelness detector feeds back the measured tank car ground horizontal inclination angle to the data solver, and the measured tank car ground horizontal inclination angle and the strain data are used as input parameters of the data solver; the data solver obtains the filling amount of the medium liquid in the low-temperature liquid tank car storage tank through fuzzy PID feedback operation, and feeds the filling amount of the medium liquid back to a vehicle-mounted load display device in the car through electric connection;
through the portable terminal, an operator can remotely monitor the liquid filling process; and after the liquid filling control indoor equipment receives a liquid filling signal of the low-temperature liquid tank car storage tank, a filling flow path is quickly and automatically cut off through a terminal computer.
Further, the strain data and the horizontal inclination angle of the ground of the tank car in the step four can be simultaneously fed back to the wireless signal receiver, and the strain data and the horizontal inclination angle of the ground of the tank car are transmitted to the portable terminal or the liquid filling control indoor equipment through the wireless signal receiver.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic diagram of data acquisition and transmission according to the present invention;
FIG. 3 is a schematic diagram of data zero calibration according to the present invention;
the components shown by the respective numbers in the drawings are clarified as follows: the system comprises a low-temperature liquid tank car 1, a tank car storage tank 2, a main shaft 3, a tank car bearing member 4, wheels 5, a strain sensor 6, a strain gauge 7, a signal amplifier 8, a data storage 9, a wireless transmitting device 10, a data resolver 11, a vehicle-mounted load display device 12, a portable terminal 13, a data printer 14, a terminal computer 15, a horizontal test bed 16, a tank car levelness detector 17 and a wireless signal receiver 18.
Detailed Description
As shown in FIG. 1, the device for controlling the filling amount of the cryogenic liquid comprises a strain sensor 6, a strain gauge 7, a signal amplifier 8, a data memory 9, a wireless transmitting device 10, a data resolver 11, a vehicle-mounted load display device 12, a portable terminal 13, a data printer 14, a terminal computer 15, a horizontal test bed 16, a tank car levelness detector 17 and a wireless signal receiver 18.
The weight of the liquid loaded in the liquid storage tank 2 is transferred to the main shaft 3 through the bearing part 4 of the vehicle, and is transferred to the wheels 5 through the main shaft, and the wheels 5 are contacted with the ground to provide support for the whole vehicle.
A main shaft strain gauge 7 is fixed on the side of the main shaft 3 of the wheel 5 close to the wheel side and is used for measuring the elastic deformation of the main shaft caused by the load of the vehicle (the dead weight of the low-temperature liquid tank car 1, the dead weight of the liquid storage tank 2 and the weight of the liquid loaded in the liquid storage tank 2). And a main shaft strain sensor 6 is arranged near the main shaft strain gauge 7, is fixed on the main shaft 3, and is used for receiving a voltage signal of the main shaft strain gauge 7 and transmitting the voltage signal to the outside.
A main shaft 3 of a wheel 5 is close to the side of the wheel, is staggered from a main shaft strain gauge 7 and a main shaft strain sensor 6 by 50-70 cm in the axial direction, and is provided with a groove car levelness detector 17 for detecting the horizontal inclination angle of the ground contacted by the vehicle 1.
As shown in fig. 2, the spindle strain gauge 7 transmits a strain signal to the spindle strain sensor 6, and the spindle strain sensor 6 transmits the strain signal to the data memory 9 through the signal amplifier 8. The tank car main shaft levelness detector 17 transmits a horizontal inclination angle measurement signal of the ground contacted by the tank car 1 to the data solver and the wireless signal receiver 18. The vehicle-mounted load display device 12 is electrically connected with the data resolver 11 and is used for displaying the filling amount of the medium liquid in the storage tank 2 of the low-temperature liquid tank car 1.
After receiving the signal, the wireless signal receiver 18 downloads the data to the portable terminal 13 or the liquid filling control room equipment (the data printer 14, the terminal computer 15).
The data memory 9 converts the stored data into a wireless signal through the wireless transmitting device 10, and has two transmission paths: a data solver 11 and a wireless signal receiver 18. For the path (r), the main shaft strain data (from the main shaft strain sensor 6) enters the data resolver 11, and the actual load of the tank car is resolved by coding together with the tank car levelness data (from the tank car levelness detector 17). For the second path, after receiving the spindle strain signal, the wireless signal receiver 18 downloads data to the portable terminal 13 or the liquid filling control room equipment (the data printer 14, the terminal computer 15).
In order to ensure the load measurement accuracy of the device, the strain sensor 6 and the tank car levelness detector 17 need to be correspondingly adjusted before starting. The horizontal test bed 16 is kept horizontal, the no-load tank car is fixed on the horizontal test bed 16, and a strain calibration zero point and a levelness detection calibration zero point are obtained through corresponding operations.
As shown in fig. 3, based on the above device, in order to realize accurate measurement of the load of the large cryogenic liquid tank car, the following filling method specifically includes the following steps:
step one, the strain sensor 6 and the tank car levelness detector 17 are adjusted and calibrated in a horizontal state, so that the zero point display accuracy of the instrument when the low-temperature liquid tank car is in no-load is ensured. Before the instrument of the cryogenic liquid tanker is adjusted to display zero, the table top of the horizontal test bed 16 needs to be adjusted to the horizontal position, and then the cryogenic liquid tanker 1 is driven to the table top of the horizontal test bed 16 and fixed.
Step 1.1, firstly, checking whether a tank car levelness detector 17 is positioned at a zero point when a low-temperature liquid tank car is positioned at a horizontal position, and if not, adjusting the tank car levelness detector 17 to display the zero point; then the empty load of the vehicle fed back by the strain sensor 6 is checked and recorded. The empty load of the tank car cannot be determined correctly here, and the accuracy of the value needs to be verified in the subsequent steps.
Step 1.2, after the levelness detector 17 of the tank car displays the horizontal direction, slowly increasing the standard mass above the gravity center of the low-temperature liquid tank car 1 step by step, wherein the standard mass at each step is 800Kg (the standard mass is not limited to the value and is different according to the actual load difference of the low-temperature liquid tank car). And recording the load reading of the vehicle fed back by the corresponding strain sensor 6 every time the first-level standard mass is added until the specified load of the cryogenic liquid tank vehicle is reached.
And 1.3, observing whether the difference value between the vehicle load and the no-load fed back by the strain sensor 6 is the added standard mass weight or not under different load levels. If yes, the vehicle no-load fed back by the strain sensor 6 is correct, and the zero point can be set to be displayed; if not, display compensation is needed for the difference between the vehicle load and empty load difference fed back by the strain sensor 6 and the added standard mass weight.
And 1.4, slowly removing the applied standard mass step by step, and correspondingly recording the vehicle load reading fed back by the strain sensor 6 every time when the applied standard mass is removed by one step until all the applied standard mass is removed. And observing the recorded data, and judging whether the difference value of the load and the empty load of the vehicle fed back by the strain sensor 6 is the added standard mass weight or not. If yes, indicating that the set display zero point is correct; if not, display compensation is needed for the difference between the vehicle load and empty load difference fed back by the strain sensor 6 and the added standard mass weight.
Step 1.5, after all the applied standard mass is removed, the display reading of the levelness detector 17 of the tank car needs to be checked again, and if the display reading is zero, the previously set display zero point is correct; if not, the display zero point needs to be set again, and the step 1.2 to the step 1.4 are repeated until the vehicle load fed back by the strain sensor 6 and the tank car levelness detector 17 display the correct zero point.
Step two, after the adjustment of the horizontal state in the step one is finished, the strain sensor and the tank car levelness detector in the inclined plane state are adjusted; after the strain sensor 6 and the tank car levelness detector 17 in the horizontal state of the low-temperature liquid tank car 1 are subjected to zero point adjustment, the display correctness of the strain sensor 6 and the tank car levelness detector 17 under the inclined surface condition is further verified.
And 2.1, under the no-load condition, slowly rotating the table top of the horizontal test table 16 in a vertical plane until the horizontal display zero of the strain sensor 6 and the tank car levelness detector 17 is adjusted, observing display readings of the strain sensor 6 and the tank car levelness detector 17 at the moment until the table top forms an alpha angle (15-20 degrees) with the horizontal direction, and if the strain sensor 6 displays zero and the tank car levelness detector 17 displays the actual rotation degree of the horizontal test table 16, indicating that the zero adjustment of the strain sensor 6 and the tank car levelness detector 17 is completed. If one data of the strain sensor and the tank car is displayed inaccurately, the step one needs to be repeated until the values of the strain sensor 6 and the tank car levelness detector 17 can be displayed accurately under the conditions of level and inclined plane when the low-temperature liquid tank car is unloaded.
And 2.2, applying a standard mass in the vertical direction to the cryogenic liquid tanker 1, and slowly increasing the standard mass above the gravity center of the cryogenic liquid tanker 1 step by step, wherein the standard mass at each stage is 800Kg (the standard mass is not limited to the value and is different according to the actual load difference of the cryogenic liquid tanker). When the first-level standard mass is added, recording the reading of the vehicle load fed back by the corresponding strain sensor 6 until the specified load capacity of the low-temperature liquid tank vehicle is reached, observing whether the difference value between the vehicle load fed back by the strain sensor 6 and the no-load is the added standard mass weight or not under different load levels, and if so, judging that the no-load of the vehicle fed back by the strain sensor 6 under the inclined plane condition is correct; if not, the step one and the step 2.1 are required to be repeated until a proper display zero point is found.
And 2.3, slowly removing the standard mass in the vertical direction step by step, and correspondingly recording the vehicle load reading fed back by the strain sensor 6 every time when the standard mass is removed by one step until all the applied standard mass is removed. And observing the recorded data, and judging whether the difference value of the load and the empty load of the vehicle fed back by the strain sensor 6 is the added standard mass weight or not. If yes, indicating that the vehicle no-load and load fed back by the strain sensor 6 under the inclined plane condition are correct; if not, the first step, the second step 2.1 and the second step 2.2 need to be repeated until a proper display zero point is found.
And step three, after the strain sensor 6 and the tank car levelness detector 17 are adjusted to display zero, the strain sensor is used for weighing the low-temperature liquid tank car load. The low-temperature liquid tank car 1 enters a filling area and is filled with liquid through a filling flow path. As liquid enters tank car 1 liquid reservoir 2, strain gage 7 measures the axle strain due to the weight of the liquid load and transmits the measurement data to strain sensor 6.
The strain sensor 6 transmits strain data to the data storage 9 in real time through the signal amplifier 8. The data stored in the data storage 9 is converted into wireless signals through the wireless transmitting device 10, and the wireless signals are respectively transmitted to the wireless signal receiver 18 and the data solver 11.
The tank car levelness detector 17 feeds back the measured tank car ground horizontal inclination angle to the data solver 11, and the measured tank car ground horizontal inclination angle and the strain data are used as input parameters of the data solver 11, and the medium liquid filling amount of the storage tank 2 of the low-temperature liquid tank car 1 is obtained through fuzzy PID feedback operation and fed back to the vehicle-mounted load display device 12 in the tank car.
The strain data and the horizontal inclination angle of the ground of the tank car can be simultaneously fed back to the wireless signal receiver 18 and transmitted to the portable terminal 13 through the wireless signal receiver 18, or input into liquid filling control indoor equipment (a data printer 14 and a terminal computer 15). The operator can remotely monitor the liquid filling process by means of the portable terminal 13. Liquid filling information transmits for liquid filling control room, can improve liquid filling security, and after liquid filling control indoor equipment received the full liquid signal of 2 storage tanks of low temperature liquid tank wagon 1, accessible terminal computer 15 cuts off the filling flow path automatically fast, prevents to lead to the filling accident because of operating personnel is not at the post.

Claims (5)

1. A cryogenic liquid charge control device, characterized by: the device comprises a strain sensor, a strain gauge, a signal amplifier, a data memory, a wireless transmitting device, a data resolver, a vehicle-mounted load display device, a portable terminal, liquid filling control indoor equipment, a horizontal test bed, a tank car levelness detector and a wireless signal receiver;
the horizontal test bed is horizontally arranged on the ground, and the middle part of the horizontal test bed is provided with a rotating shaft which can rotate along the rotating shaft; a tank car fixing device is arranged on the horizontal test bed;
the strain sensor and the strain gauge are coaxially arranged on the side, close to the wheel, of the wheel spindle, and the strain sensor is electrically connected with the strain gauge; the strain sensor is used for receiving and transmitting a voltage signal of the strain gauge, and the strain gauge is used for measuring the elastic deformation of the main shaft caused by bearing the load of the vehicle; the tank car levelness detector is coaxially installed with the strain sensor and the strain gauge, is axially staggered with the strain sensor and the strain gauge and is used for detecting a horizontal inclination angle of a vehicle and the ground contacted with the vehicle; the strain sensor is electrically connected with the data memory through the signal amplifier, and the data of the strain sensor is transmitted to the data memory through the signal amplifier; the tank car levelness detector is wirelessly connected with the data solver and the wireless signal receiver and transmits a horizontal inclination angle measurement signal of the ground contacted by the tank car to the data solver and the wireless signal receiver;
the data memory is electrically connected with the wireless transmitting device, and the wireless transmitting device converts the stored data into a wireless signal; the wireless transmitting device is electrically connected with the data resolver and the wireless signal receiver, the wireless signal receiver is electrically connected with the portable terminal and the liquid filling control indoor equipment, and the wireless signal receiver downloads data to the portable terminal and the liquid filling control indoor equipment after receiving signals; and the vehicle-mounted load display device is electrically connected with the data resolver and is used for displaying the liquid filling amount in the storage tank of the low-temperature liquid tank car.
2. A cryogenic liquid charge control apparatus according to claim 1, wherein: the tank car levelness detector is axially staggered by 50-70 cm from the strain gauge and the strain sensor.
3. A cryogenic liquid charge control apparatus according to claim 1, wherein: the liquid filling control indoor equipment comprises a data printer and a terminal computer.
4. A method of filling a cryogenic liquid, comprising: the method specifically comprises the following steps:
firstly, in a horizontal state, a strain sensor and a tank car levelness detector are calibrated, so that a strain calibration zero point and a levelness detection calibration zero point are enabled;
step 1.1, the table top of a horizontal test table is required to be adjusted to a horizontal position, then a tank car to be injected is driven to the table top of the horizontal test table and is fixedly seen, and at the moment, the low-temperature liquid tank car is located at the horizontal position; checking whether the levelness detector of the tank car is positioned at the zero point, if not, adjusting the levelness detector of the tank car to enable levelness detection to calibrate the zero point; then checking the vehicle no-load fed back by the strain sensor and recording;
the accuracy of the numerical value can not be determined by the empty load of the tank car, and the accuracy of the numerical value needs to be verified in the subsequent steps;
step 1.2, slowly increasing the standard mass step by step above the gravity center of the low-temperature liquid tank car after the levelness detector of the tank car detects and calibrates a zero point; recording the vehicle load reading fed back by the corresponding strain sensor every time the first-level standard mass is added until the specified load capacity of the low-temperature liquid tank vehicle is reached;
step 1.3, observing whether the difference value of the vehicle load and the no-load fed back by the strain sensor is the added standard mass weight or not under different load levels; if so, the vehicle no-load fed back by the strain sensor is correct, and the vehicle-mounted load display device displays a zero point at the moment; if not, displaying and compensating the difference between the difference value of the vehicle load and the no-load fed back by the strain sensor and the added standard mass weight, and manually adjusting the vehicle-mounted load display device to display a zero point;
step 1.4, slowly removing the applied standard mass step by step, and correspondingly recording the vehicle load reading fed back by the strain sensor every time when the applied standard mass is removed by one step until all the applied standard mass is removed; observing the recorded data, and judging whether the difference value between the vehicle load and the no-load fed back by the strain sensor is the added standard mass weight or not; if so, indicating that the zero point displayed by the vehicle-mounted load display device is correct; if not, displaying and compensating the difference between the difference value of the vehicle load and the no-load fed back by the strain sensor and the added standard mass weight, and manually adjusting the vehicle-mounted load display device to display a zero point;
step 1.5, after the applied standard quality is completely removed, the display reading of the levelness detector of the tank car needs to be checked again, and if the display reading is zero, the levelness detection calibration zero point in the step 1.1 is correct; if not, repeating the step 1.1 again, repeating the step 1.2 to the step 1.4 until the vehicle load and the tank car levelness detector fed back by the strain sensor displays correct zero points, namely a strain calibration zero point and a levelness detection calibration zero point;
step two, after the adjustment of the horizontal state in the step one is finished, the strain sensor and the tank car levelness detector in the inclined plane state are adjusted;
step 2.1, slowly rotating the table top of the horizontal test bed in a vertical plane under the condition of no-load of the low-temperature liquid tank car until the table top forms an angle of 15-20 degrees with the horizontal direction, observing the reading displayed by the strain sensor and the tank car levelness detector at the moment, and if the strain sensor displays zero and the tank car levelness detector displays the actual rotation degree of the horizontal test bed, indicating that the zero point adjustment of the strain sensor and the tank car levelness detector is finished; if one of the two is displayed inaccurately, the first step needs to be repeated;
step 2.2, applying standard mass in the vertical direction to the low-temperature liquid tank car, and slowly increasing the standard mass step by step above the gravity center of the low-temperature liquid tank car; when the first-level standard mass is added, recording the reading of the vehicle load fed back by the corresponding strain sensor until the specified load capacity of the low-temperature liquid tank vehicle is reached, observing whether the difference value between the vehicle load fed back by the strain sensor and the no-load is the added standard mass weight or not under different load levels, and if so, judging that the no-load of the vehicle fed back by the strain sensor under the inclined plane condition is correct; if not, repeating the step one and the step 2.1;
2.3, slowly removing the standard mass in the vertical direction step by step, and correspondingly recording the vehicle load reading fed back by the strain sensor every time when the standard mass is removed by one step until all the applied standard mass is removed; observing the recorded data, and judging whether the difference value between the vehicle load and the no-load fed back by the strain sensor is the added standard mass weight or not; if so, indicating that the empty load and the load of the vehicle fed back by the strain sensor under the inclined plane condition are correct; if not, repeating the step one, the step 2.1 and the step 2.2;
thirdly, after the strain sensor and the tank car levelness detector are calibrated, weighing the load of the low-temperature liquid tank car to be injected; the tank car enters a filling area, and liquid filling is carried out on the low-temperature liquid tank car through a filling flow path; the strain gauge measures the strain of the axle caused by the liquid loading weight along with the liquid entering the liquid storage tank of the tank car, and transmits the measured data to the strain sensor;
transmitting the strain data to a data memory by the strain sensor through a signal amplifier in real time; data stored in the data memory is converted into wireless signals through a wireless transmitting device and respectively transmitted to a wireless signal receiver and a data resolver; the tank car levelness detector feeds back the measured tank car ground horizontal inclination angle to the data solver, and the measured tank car ground horizontal inclination angle and the strain data are used as input parameters of the data solver; the data solver obtains the filling amount of the medium liquid in the low-temperature liquid tank car storage tank through fuzzy PID feedback operation, and feeds the filling amount of the medium liquid back to a vehicle-mounted load display device in the car through electric connection;
through the portable terminal, an operator can remotely monitor the liquid filling process; and after the liquid filling control indoor equipment receives a liquid filling signal of the low-temperature liquid tank car storage tank, a filling flow path is quickly and automatically cut off through a terminal computer.
5. The cryogenic liquid filling method of claim 4, wherein: and in the fourth step, the strain data and the ground horizontal inclination angle of the tank car can be simultaneously fed back to the wireless signal receiver, and the strain data and the ground horizontal inclination angle of the tank car are transmitted to the portable terminal or the liquid filling control indoor equipment through the wireless signal receiver.
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