CN220018691U - Liquefied gas surplus counting system - Google Patents

Abstract

The utility model relates to a liquefied gas surplus counting system, which comprises a monitoring computer and a plurality of surplus counting devices communicated with the monitoring computer, wherein the surplus counting devices comprise a chassis, a tray, a weighing sensor, an overweight prevention strut, a patch magnet, a magnetic induction sensor, a plurality of radio frequency electronic tags, a radio frequency electronic tag reading and writing module, an alarm module, a display module and a singlechip module.

Description

Liquefied gas surplus counting system

Technical Field

The utility model relates to the technical field of liquefied gas management, in particular to a liquefied gas surplus counting system.

Background

The liquefied gas tank is a storage tank for storing liquefied petroleum gas (liquefied gas for short), has high pressure when the liquefied gas exists in the storage tank, belongs to special equipment, has the advantages of strong air tightness, safety, reliability, no pollution, easy transportation, convenient movement and the like, and is widely applied in various fields.

When the liquefied gas tank is inflated for the first time at the liquefied gas station, the weight of the gas tank (i.e. the weight of the empty tank) is firstly weighed, the empty tank weights of the liquefied gas tanks with different specifications are fixed, such as 2kg,3kg,5kg,10kg,15kg,20kg and the like, then the inflating amount is determined according to the empty tank weights, and the larger the empty tank weight is, the more the inflating amount is. After the first inflation is completed, a user takes the tank back to use, when the next inflation is carried out, the weight of the tank is weighed again, at the moment, if the weighed weight is larger than the corresponding empty tank weight, the residual liquefied gas in the tank is indicated, and the residual liquefied gas weight in the tank is the residual liquefied gas, and the residual liquefied gas is deducted from the standard filling amount when the tank is inflated, so that the liquefied gas is required to be firstly determined when the tank is inflated. At present, statistics of the residual liquefied gas is obtained by weighing the liquefied gas tank by an operator through a weighing platform, in the weighing process, the operator needs to rotate a knob to a selected correct filling gauge, the weighing platform is required to be kept to be displayed as a zero value in the process and is not impacted by any external force, after the filling amount gauge is selected, the liquefied gas tank is placed on the weighing platform, at the moment, the displayed value on the weighing platform is the residual liquefied gas in the liquefied gas tank, and then the operator completes the inflating operation according to the weighed residual liquefied gas. The mode of manually selecting and reading the residual quantity of the liquefied gas is adopted, so that the operation process is complicated, the automation degree is low, the inflation efficiency is low, the manual operation is easy to make mistakes, and accidents are easy to cause.

The utility model patent with the publication number of CN105822900A provides a liquefied gas residual quantity monitoring system in a gas bottle, which comprises at least 2 temperature sensors arranged on the bottle body, wherein the temperature sensors are sequentially and uniformly distributed at intervals from top to bottom, the monitoring system also comprises a temperature acquisition circuit, a data analysis processor and a mobile phone APP, and the bottle body is also provided with a transmitter capable of transmitting the data result of the data analysis processor to the mobile phone APP; the temperature sensor, the temperature acquisition circuit and the data analysis processor are sequentially connected. In the use process of the liquefied gas, the liquid level is gradually reduced, the number of the temperature sensors 2 capable of sensing higher temperature is gradually increased, temperature data detected by each temperature sensor 2 are collected through the temperature acquisition circuit 3 and transmitted to the data analysis processor 4, the data analysis processor 4 calculates the residual amount of the liquefied gas in the gas cylinder by judging the difference and the proportion data of low temperature and high temperature, and the calculated result can be transmitted to the APP corresponding to the mobile phone through the transmitter 6, so that the observation of a user is facilitated. Although the liquefied gas surplus monitoring system can display the liquefied gas surplus on the mobile phone APP, the measuring and calculating result is closely related to the quantity of the temperature sensors, the more the temperature sensors are, the higher the accuracy is, so that the measuring and calculating error is relatively larger, and meanwhile, the structure of the bottle body is changed due to the fact that the monitoring system is required to be provided with at least 2 temperature sensors on the bottle body, and the transportation and storage of the bottle body are affected and potential safety hazards are brought.

The utility model patent with publication number of CN113175619A provides a method and a device for monitoring the residual quantity of filled liquefied gas, wherein the device is provided with a tank and a gas pipe, an angle valve is arranged on the tank, a signal acquisition unit is connected to the angle valve, and the signal acquisition unit is used for acquiring the pressure and the temperature of the liquefied gas in the tank. The method comprises the following specific steps: (1) After the tank filled with the liquefied gas is stably installed, measuring the temperature Ttest and the pressure Ptest of the liquefied gas in the tank by an information acquisition unit; (2) Determining the ratio of propane to butane in the liquefied gas according to the temperature Tmeasure and the pressure P measure of the liquefied gas; (3) And setting a surplus alarm reminding according to the ratio of propane in the liquefied gas. The device can only carry out alarm prompt when the residual amount of the liquefied gas in the tank is insufficient according to the preset alarm value, but cannot realize the instant and accurate measurement of the residual amount of the liquefied gas in the tank, so the device is not suitable for the scene of filling a large amount of liquefied gas tanks by a liquefied gas station.

Disclosure of Invention

In order to solve the problems of complicated operation, low automation degree, easy error, need of changing the tank structure and inapplicability to the application scene of an inflation station in the existing liquefied gas residual measurement, the utility model provides the liquefied gas residual counting system which has high automation degree, does not need to change the original structure of the liquefied gas tank, has high liquefied gas residual measurement precision and is very suitable for being used in the inflation scene of the liquefied gas station or other liquefied gases.

In order to solve the problems, the utility model adopts the following technical scheme:

the liquefied gas surplus counting system comprises a monitoring computer and a plurality of surplus counting devices communicated with the monitoring computer, wherein each surplus counting device comprises a chassis, a tray, a weighing sensor, an overweight prevention strut, a patch magnet, a magnetic induction sensor, a plurality of radio frequency electronic tags, a radio frequency electronic tag read-write module, an alarm module, a display module and a singlechip module;

the center of the chassis is provided with a groove, the overweight prevention support posts are fixed at the center of the groove, the three weighing sensors are circumferentially and uniformly distributed in the groove by taking the overweight prevention support posts as the center, the height of the overweight prevention support posts is lower than that of the weighing sensors, and the magnetic induction sensors are fixed on the side surfaces of the overweight prevention support posts;

the tray is fixed with the moving ends of the weighing sensors through countersunk head screws, the patch type magnet is stuck to the bottom of the tray and is opposite to the magnetic induction sensors up and down, the lower edge of the tray is provided with a side wall, and the upper edge of the tray is provided with a baffle plate;

each liquefied gas tank is stuck with a radio frequency electronic tag which is pre-stored with liquefied gas tank identification information, a radio frequency electronic tag read-write module automatically reads the radio frequency electronic tag on the liquefied gas tank and sends the read identification information data to the singlechip module, wherein the liquefied gas tank identification information comprises the number of the liquefied gas tank, the empty tank quality and the standard filling quantity; the singlechip module acquires weight data of the three weighing sensors in real time, calculates an average value of the weight data as the current weight of the liquefied gas tank, calculates the liquefied gas allowance of the liquefied gas tank according to the current weight and the empty tank quality, and uploads the liquefied gas tank identification information and the liquefied gas allowance to the monitoring computer, and the monitoring computer records and stores the received data;

the magnetic induction sensor, the alarm module and the display module are respectively connected with the singlechip module, and the display module is used for displaying the current weight of the liquefied gas tank and the calculated liquefied gas allowance under the control of the singlechip module; after the measurement of the residual quantity of the liquefied gas in the liquefied gas tank is finished, the singlechip module controls the alarm module to send out prompt sound alarm; when the current weight of the liquefied gas tank is greater than a threshold value, the patch type magnet triggers the magnetic induction sensor, the magnetic induction sensor sends an overweight alarm signal to the singlechip module, and the singlechip module controls the alarm module to send overweight voice alarm.

Compared with the prior art, the utility model has the following beneficial effects:

(1) According to the liquefied gas residual quantity counting system, the radio frequency electronic tag which is stored with the liquefied gas tank identification information in advance is stuck on the liquefied gas tank, when the liquefied gas tank with the radio frequency electronic tag is placed on the tray of the residual quantity counting device, the radio frequency electronic tag read-write module can automatically read the identification information in the radio frequency electronic tag and send the identification information to the singlechip module, so that the information such as the number, the empty tank quality and the standard filling quantity of the liquefied gas tank is obtained, meanwhile, the singlechip module automatically collects and determines the current weight of the liquefied gas tank through the weighing sensor, finally, the liquefied gas residual quantity of the liquefied gas tank is automatically calculated according to the empty tank quality and the current weight, the current weight of the liquefied gas tank and the liquefied gas residual quantity are displayed through the display module, the monitoring computer is used for recording and storing the data, an operator does not need to manually select the corresponding filling quantity specification and read and record the corresponding measured data according to the liquefied gas tank specification, the automation degree is high, the measurement accuracy is high, and the measurement result is clear at a glance, and the error rate of manual operation is reduced;

(2) The allowance counting device has an overweight protection function, when the weight of the liquefied gas tank is larger than a threshold value, the distance between the patch magnet at the bottom of the tray and the magnetic induction sensor fixed on the overweight prevention support is smaller than the threshold value, so that the magnetic induction sensor is triggered to send an overweight alarm signal to the singlechip module, the alarm module sends out an overweight voice alarm, thereby reminding an operator in time, and meanwhile, the overweight prevention support can provide stable support for the tray in overweight, and the weighing sensor is prevented from being damaged;

(3) The utility model provides a liquefied gas surplus counting system integrating data acquisition, recording storage and display, which can replace the mode of manually measuring and recording the liquefied gas surplus in the prior art, improves the liquefied gas surplus measuring efficiency, has higher precision, reduces the workload of operators, does not need to change the original structure of a liquefied gas tank, and has higher safety.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

FIG. 1 is a schematic diagram of a system for counting the residual amount of liquefied gas according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the whole structure of the balance counting device in the utility model;

FIG. 3 is a schematic diagram of the remaining amount counting device after opening the tray;

FIG. 4 is a schematic view of a tray structure;

FIG. 5 is a schematic diagram of the residual counting device in operation;

FIG. 6 is a schematic diagram of a margin counting device;

reference numerals illustrate:

1. a monitoring computer; 2. a margin counting device; 3. a tank body;

2-1, a chassis; 2-2, a tray; 2-3, a weighing sensor; 2-4, overweight prevention struts; 2-5, a patch type magnet; 2-6, a magnetic induction sensor; 2-7, a radio frequency electronic tag; 2-8, a radio frequency electronic tag read-write module; 2-9, an alarm module; 2-10, a display module; 2-11, a singlechip module; 2-12, baffle.

Detailed Description

In order to make the technical scheme of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings.

As shown in fig. 1, the present embodiment provides a liquefied gas residual quantity counting system, which includes a monitoring computer 1 and a plurality of residual quantity counting devices 2, each residual quantity counting device 2 communicates with the monitoring computer 1 in a wired or wireless manner, for example, a field bus connection or a wireless network connection or the like may be adopted, the residual quantity counting device 2 uploads data to the monitoring computer 1, and the monitoring computer 1 records and stores the received data, so that other devices may be called.

As shown in fig. 2-4, the allowance counting device 2 comprises a chassis 2-1, a tray 2-2, a weighing sensor 2-3, an overweight prevention strut 2-4, a patch magnet 2-5, a magnetic induction sensor 2-6, a radio frequency electronic tag 2-7, a radio frequency electronic tag read-write module 2-8, an alarm module 2-9, a display module 2-10 and a singlechip module 2-11, wherein the specific number of the radio frequency electronic tags 2-7 can be selected according to the number of actual liquefied gas tanks, one or a plurality of radio frequency electronic tags can be used, the liquefied gas tank identification information corresponding to the liquefied gas tank with a number is prestored in each radio frequency electronic tag 2-7, and the radio frequency electronic tag read-write module 2-8 can read the liquefied gas tank identification information stored in all radio frequency electronic tags 2-7.

Specifically, a groove is formed in the center of the chassis 2-1, for example, a circular groove which is convenient to process in fig. 3, the groove can be in other conventional shapes, such as a square shape, the overweight prevention support posts 2-4 are fixed at the center of the groove, the three weighing sensors 2-3 are uniformly distributed in the groove around the overweight prevention support posts 2-4, and the three weighing sensors 2-3 form a stable support for the tray 2-2. The height of the overweight prevention strut 2-4 is lower than that of the weighing sensor 2-3, the magnetic induction sensor 2-6 is fixed on the side surface of the overweight prevention strut 2-4, the detection end of the magnetic induction sensor 2-6 is upward, and the height of the overweight prevention strut is not more than the upper surface of the overweight prevention strut 2-4. Further, in order to facilitate movement of the allowance counting device, the chassis 2-1 is square, and universal wheels with brakes are respectively arranged at four corners of the square.

The shape of the tray 2-2 is matched with the shape of the groove, the outer diameter of the tray 2-2 is slightly smaller than the inner diameter of the groove, the tray 2-2 is covered on the overweight prevention support column 2-4 and all weighing sensors 2-3, screw holes are formed in the moving ends of the weighing sensors 2-3 and corresponding positions on the tray 2-2, and the tray 2-2 is fixed with the moving ends of the weighing sensors 2-3 through countersunk screws and the screw holes. The patch type magnet 2-5 is adhered to the bottom of the tray 2-2, the patch type magnet 2-5 is opposite to the magnetic induction sensor 2-6 up and down, and when the distance between the patch type magnet 2-5 and the magnetic induction sensor 2-6 is smaller than a threshold value set by the sensor, the magnetic force generated by the patch type magnet 2-5 enables alloy reeds in the magnetic induction sensor 2-6 to be attracted, the contacts are conducted, and the magnetic induction sensor 2-6 sends an overweight alarm signal to the singlechip module 2-11. Preferably, the load cell 2-3 in this embodiment adopts a resistance strain type load cell, which is a sensor that converts mechanical quantity into an electrical signal by using resistance strain effect, and its working principle is: the elastic body generates elastic deformation under the action of external force, so that the resistance strain gauge stuck on the surface of the elastic body also generates deformation along with the deformation, after the deformation of the resistance strain gauge, the resistance value of the resistance strain gauge changes (increases or decreases), and the resistance change is converted into an electric signal (voltage or current) through a corresponding measuring circuit, so that the process of converting the external force into the electric signal is completed. The model of the resistance strain weighing sensor can be specifically selected from Euclidean AT8104, AT8107 and the like, and the resistance strain weighing sensor has the advantages of high detection precision, good stability, strong anti-interference performance, small volume, light weight, easiness in installation and the like.

The lower edge of the tray 2-2 is provided with a circle of side walls, and the height of the side walls is smaller than the depth of the grooves. The upper edge of the tray 2-2 is provided with a circle of baffle plates 2-12, which is used for providing a reference object for placing the liquefied gas tank, so that the position of the liquefied gas tank placed on the tray 2-2 is prevented from being deviated, and the measurement result is inaccurate, but the height of the baffle plates 2-12 is lower, for example, 1-5 cm, so that the liquefied gas tank can be placed and taken on the tray 2-2 conveniently.

Further, the top of tray 2-2 is equipped with the jar body 3 diameter assorted positioning groove with the liquefied gas jar, and when liquefied gas jar was placed on tray 2-2, jar body 3 bottom was located positioning groove to realize the better location to the liquefied gas jar, prevent that liquefied gas jar from placing the deviation, influence measurement accuracy.

The tank body of each liquefied gas tank is stuck with a radio frequency electronic tag 2-7 which stores liquefied gas tank identification information in advance, as shown in fig. 5, after the liquefied gas tank to be measured is placed on the tray 2-2, the radio frequency electronic tag read-write module 2-8 automatically reads the radio frequency electronic tag 2-7 on the liquefied gas tank and sends the read identification information data to the singlechip module 2-11, wherein the liquefied gas tank identification information comprises information such as the number of the liquefied gas tank, the empty tank quality, the standard filling amount, the historical filling data and the like. The singlechip module 2-11 collects weight data measured by the three weighing sensors 2-3 in real time and calculates the average value of the weight data, and the average value is taken as the current weight M of the liquefied gas tank ₁ The singlechip modules 2-11 are used for controlling the weight M according to the current weight ₁ Mass M of empty can ₂ Calculating the liquid in a liquid gas tankThe specific calculation formula of the residual amount M of the chemical gas is as follows: m=m ₁ -M ₂ . Next, the singlechip module 2-11 uploads the identification information of the liquefied gas tank and the residual amount of the liquefied gas to the monitoring computer 1, and the monitoring computer 1 records and stores the received data. The monitoring computer 1 in this embodiment can communicate with an inflation control system of an inflation station, send data such as liquefied gas tank identification information and liquefied gas surplus to the inflation control system, calculate the inflation amount of the liquefied gas tank by the inflation control system, calculate a formula to be standard inflation amount minus the liquefied gas surplus, and then control an inflation gun to inflate the liquefied gas tank according to the calculated inflation amount, so as to complete the inflation process of the liquefied gas tank.

As shown in fig. 6, the magnetic induction sensor 2-6, the alarm module 2-9 and the display module 2-10 are respectively connected with the single-chip microcomputer module 2-11, and the display module 2-10 is used for displaying the current weight of the liquefied gas tank and the calculated liquefied gas allowance under the control of the single-chip microcomputer module 2-11; when the measurement of the residual liquefied gas in the liquefied gas tank is finished, the singlechip module 2-11 controls the display module 2-10 to display the current weight and the calculated residual liquefied gas, and simultaneously controls the alarm module 2-9 to give out a prompt sound alarm, for example, the alarm module 2-9 comprises a buzzer, and the singlechip module 2-11 drives the buzzer to give out a prompt sound. When the current weight of the liquefied gas tank is greater than a threshold value, the patch type magnet 2-5 triggers the magnetic induction sensor 2-6, the magnetic induction sensor 2-6 sends an overweight alarm signal to the singlechip module 2-11, the singlechip module 2-11 controls the alarm module 2-9 to send an overweight voice alarm, for example, the alarm module 2-9 comprises a voice playing sub-module, and the singlechip module 2-11 drives the voice playing sub-module to play pre-stored voice information. The single-chip microcomputer modules 2-11 in this embodiment can be implemented by using an existing 51 single-chip microcomputer or STM32 single-chip microcomputer, and will not be described here again.

The display module 2-10 in this embodiment can adopt LCD display screen or LED display screen to realize, and display module 2-10 both can integrate on chassis 2-1, also can pass through the support peripheral hardware chassis 2-1, for example LCD display screen installs on the top of support, and the bottom mounting of support is on chassis 2-1, and the support can vertical setting also can the slope setting, guarantees that LCD display screen is perpendicular with the people's eye sight when the slope setting, makes things convenient for operating personnel to look over.

The liquefied gas balance counting system provided by the utility model has the following beneficial effects:

(1) According to the liquefied gas residual quantity counting system, the radio frequency electronic tag which is stored with the liquefied gas tank identification information in advance is stuck on the liquefied gas tank, when the liquefied gas tank with the radio frequency electronic tag is placed on the tray of the residual quantity counting device, the radio frequency electronic tag read-write module can automatically read the identification information in the radio frequency electronic tag and send the identification information to the singlechip module, so that the information such as the number, the empty tank quality and the standard filling quantity of the liquefied gas tank is obtained, meanwhile, the singlechip module automatically collects and determines the current weight of the liquefied gas tank through the weighing sensor, finally, the liquefied gas residual quantity of the liquefied gas tank is automatically calculated according to the empty tank quality and the current weight, the current weight of the liquefied gas tank and the liquefied gas residual quantity are displayed through the display module, the monitoring computer is used for recording and storing the data, an operator does not need to manually select the corresponding filling quantity specification and read and record the corresponding measured data according to the liquefied gas tank specification, the automation degree is high, the measurement accuracy is high, and the measurement result is clear at a glance, and the error rate of manual operation is reduced;

(2) The allowance counting device has an overweight protection function, when the weight of the liquefied gas tank is larger than a threshold value, the patch type magnet at the bottom of the tray is close to the magnetic induction sensor fixed on the overweight prevention support, so that the magnetic induction sensor is triggered to send an overweight alarm signal to the singlechip module, the alarm module sends out an overweight voice alarm, thereby reminding an operator in time, and meanwhile, the overweight prevention support provides stable support for the tray and avoids the weighing sensor from being damaged;

(3) The utility model provides a liquefied gas surplus counting system integrating data acquisition, recording storage and display, which can replace the mode of manually measuring and recording the liquefied gas surplus in the prior art, improves the liquefied gas surplus measuring efficiency, has higher precision and reduces the workload of operators; the original structure of the liquefied gas tank is not required to be changed, and the safety is high.

While certain exemplary embodiments of the present utility model have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the utility model, which is defined by the appended claims.

Claims (8)

1. The liquefied gas surplus counting system is characterized by comprising a monitoring computer (1) and a plurality of surplus counting devices (2) communicated with the monitoring computer (1), wherein each surplus counting device (2) comprises a chassis (2-1), a tray (2-2), a weighing sensor (2-3), an overweight prevention strut (2-4), a patch magnet (2-5), a magnetic induction sensor (2-6), a plurality of radio frequency electronic tags (2-7), a radio frequency electronic tag read-write module (2-8), an alarm module (2-9), a display module (2-10) and a singlechip module (2-11);

the center of the chassis (2-1) is provided with a groove, the overweight prevention support posts (2-4) are fixed at the center of the groove, the three weighing sensors (2-3) are circumferentially and uniformly distributed in the groove by taking the overweight prevention support posts (2-4) as the center, the height of the overweight prevention support posts (2-4) is lower than the height of the weighing sensors (2-3), and the side surfaces of the overweight prevention support posts (2-4) are fixed with the magnetic induction sensors (2-6);

the tray (2-2) is fixed with the motion end of each weighing sensor (2-3) through countersunk screws, the patch type magnet (2-5) is stuck to the bottom of the tray (2-2) and is opposite to the magnetic induction sensors (2-6) up and down, the lower edge of the tray (2-2) is provided with a side wall, and the upper edge of the tray (2-2) is provided with a baffle (2-12);

each liquefied gas tank is stuck with a radio frequency electronic tag (2-7) which is pre-stored with liquefied gas tank identification information, a radio frequency electronic tag read-write module (2-8) automatically reads the radio frequency electronic tag (2-7) on the liquefied gas tank and sends the read identification information data to the singlechip module (2-11), wherein the liquefied gas tank identification information comprises the number of the liquefied gas tank, the empty tank quality and the standard filling quantity; the singlechip module (2-11) collects weight data of the three weighing sensors (2-3) in real time, calculates an average value of the weight data as the current weight of the liquefied gas tank, calculates the liquefied gas allowance of the liquefied gas tank according to the current weight and the empty tank quality, and uploads the liquefied gas tank identification information and the liquefied gas allowance to the monitoring computer (1), and the monitoring computer (1) records and stores the received data;

the magnetic induction sensor (2-6), the alarm module (2-9) and the display module (2-10) are respectively connected with the single chip microcomputer module (2-11), and the display module (2-10) is used for displaying the current weight of the liquefied gas tank and the calculated liquefied gas allowance under the control of the single chip microcomputer module (2-11); after the measurement of the residual quantity of the liquefied gas in the liquefied gas tank is finished, the singlechip module (2-11) controls the alarm module (2-9) to send out prompt sound alarm; when the current weight of the liquefied gas tank is greater than a threshold value, the patch type magnet (2-5) triggers the magnetic induction sensor (2-6), the magnetic induction sensor (2-6) sends an overweight alarm signal to the singlechip module (2-11), and the singlechip module (2-11) controls the alarm module (2-9) to send out overweight voice alarm.

2. The liquefied gas balance counting system according to claim 1, wherein the display module (2-10) employs an LCD display screen.

3. The liquefied gas balance counting system according to claim 2, wherein the LCD display screen is mounted on the chassis (2-1).

4. The liquefied gas balance counting system according to claim 2, wherein the LCD display screen is mounted on a top end of a bracket, and a bottom end of the bracket is fixed on the chassis (2-1).

5. The liquefied gas balance counting system according to claim 1, wherein the chassis (2-1) is square in shape, and four corners of the square are provided with universal wheels with brakes.

6. The liquefied gas remaining amount counting system of claim 1, wherein the groove is circular or square in shape.

7. The liquefied gas remaining amount counting system according to claim 1, wherein the top of the tray (2-2) is provided with a positioning groove identical to the maximum diameter of the tank.

8. The liquefied gas balance counting system according to claim 1, wherein the alarm module (2-9) comprises a buzzer for sounding a prompt and a voice playing sub-module for playing pre-stored voice information.