An electronic scale weighing controller filling control method for liquefied gas filling

Abstract

The present invention discloses a filling control method for an electronic scale weighing controller in liquefied gas filling. Parameters of different types of gas cylinders are preset, and the opening and closing of valves are controlled by the electronic scale weighing controller for filling, while monitoring the weight of the gas cylinder and the gas pressure inside the gas cylinder. The weight monitoring includes four judgment paths: maximum weight, target filling weight, weight slope increase, and filling rate detection, to ensure the rationality and safety of the filling speed. The gas pressure monitoring performs pressure relief treatment by comparing the current pressure with the preset value. The pre-treatment before filling includes filling preparation, pressure relief, replacement, and vacuum, to ensure the safety of the gas cylinder. The filling preparation provides PDA code scanning, local filling, and local code scanning modes, which adapt to different needs, improve the flexibility and efficiency of the filling process, and ensure the accuracy and safety of the filling process.

Description

Technical Field

[0001] The present invention relates to the field of industrial automation control, and particularly to a filling control method for an electronic scale weighing controller for liquefied gas filling. Background Art

[0002] Liquefied gas filling is a common operation in industrial production and daily life, and is widely used in fields such as medicine, chemical industry, and energy. The filling process of liquefied gas needs to be strictly controlled to ensure the safety and accuracy of filling. Traditional filling methods mainly rely on manual operation and empirical judgment, and there are problems such as inaccurate filling amount, unstable filling speed, and large potential safety hazards. With the development of automation technology, electronic scale weighing controllers have gradually been applied to the liquefied gas filling process. By presetting cylinder parameters and real-time monitoring of the filling process, the filling accuracy and safety can be effectively improved.

[0003] However, there are still some deficiencies in the existing electronic scale weighing controllers during the filling process. For example, the monitoring of the cylinder weight and air pressure during the filling process is not comprehensive enough, which is likely to cause overfilling or underfilling; the control of the filling rate is not precise enough, which may lead to too fast or too slow filling speed, affecting the filling efficiency and safety; in addition, when dealing with the air pressure change in the cylinder, the existing controllers lack an effective automatic pressure relief mechanism, which may cause too high air pressure in the cylinder and pose a potential safety hazard. Therefore, it is of great practical significance to develop an electronic scale weighing controller that can comprehensively monitor the cylinder weight and air pressure, precisely control the filling rate, and have an automatic pressure relief function. Summary of the Invention

[0004] The purpose of the present invention is to provide a filling control method for an electronic scale weighing controller for liquefied gas filling, which solves the above-mentioned filling problems.

[0005] The present invention is achieved through the following technical solutions:

[0006] A filling control method for an electronic scale weighing controller for liquefied gas filling, wherein weight parameters and pressure parameters of different types of cylinders are preset in the electronic scale weighing controller, and the filling control method includes the following steps:

[0007] S1. Start the electronic scale weighing controller, select the specification of the cylinder to be filled to obtain the weight parameters and pressure parameters of the cylinder to be filled. The electronic scale weighing controller controls the vent valve V2 and the vacuum valve V3 to open, closes the filling valve V1, and performs pre-filling pretreatment on the cylinder to be filled.

[0008] S2. The electronic scale weighing controller closes the vent valves V2 and V3, opens the filling valve V1, records the filling information, sends a pump start signal for filling, and the filling timer starts timing.

[0009] S3. Compare the current timing value of the filling timer with the maximum timing value specified for the filling timer. If the current timing value is greater than the maximum timing value, go to S4; if the current timing value is less than the maximum timing value, go to S5;

[0010] S4. The indicator light flashes to remind, and manually confirm whether to continue filling. If so, go to S2 and reset the current timing value of the filling timer to zero; if not, close the filling valve V1 and execute the filling end process to end the filling;

[0011] S5. The electronic scale weighing controller obtains the current total weight through the weighing sensor and the current pressure of the pressure transmitter in the gas cylinder through the pressure transmitter. Use the obtained current total weight and weight parameters to monitor the current total weight and the filling rate of the gas cylinder. At the same time, use the current pressure of the pressure transmitter in the bottle and the pressure parameters to monitor and judge the air pressure generated after the liquefied gas vaporizes due to the external temperature in the gas cylinder. At the same time, monitor the weight and pressure to ensure the filling of the gas cylinder.

[0012] Further, the monitoring of the current total weight and the filling rate of the gas cylinder using the obtained current total weight and weight parameters has four judgment paths. The four judgment paths are specifically: the maximum weight judgment path, the target filling weight judgment path, the weight slope increase path, and the filling rate detection judgment path.

[0013] Further, the weight parameters used in the maximum weight judgment path are the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder. The specific steps are as follows:

[0014] E MAX1 . If the current total weight is greater than or equal to the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder, the red light flashes to alarm;

[0015] E MAX2 . Close the filling valve V1 and open the vent valve V2;

[0016] E MAX3 . If the current total weight is greater than the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the target filling weight of the gas cylinder, go to E MAX2 , otherwise go to E MAX4 ;

[0017] E MAX4 . After closing the vent valve V2, execute the filling end process to finally end the filling.

[0018] Further, the weight parameters used in the target filling weight judgment path are the weight of the gas cylinder itself, the weight of the gas cylinder accessories, the maximum filling weight of the gas cylinder, and the target filling weight of the gas cylinder. The specific steps are as follows:

[0019] EM1. The current total weight is less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the maximum filling weight of the cylinder.

[0020] EM2. The current total weight is greater than or equal to the sum of the cylinder's own weight, the weight of the cylinder accessories, and the target filling weight of the cylinder.

[0021] EM3. After closing the filling valve V1, execute the filling end process and finally end the filling.

[0022] Furthermore, the weight parameters used in the weight slope increasing path are the cylinder's own weight, the weight of the cylinder accessories, the maximum filling weight of the cylinder, the target filling weight of the cylinder, and the upper limit of the weight increasing slope. The specific steps are as follows:

[0023] EL1. The current total weight is less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the maximum filling weight of the cylinder.

[0024] EL2. The current total weight is greater than or equal to the sum of the cylinder's own weight, the weight of the cylinder accessories, and the target filling weight of the cylinder.

[0025] EL3. Calculate the average slope of the weight change every two seconds, and the average slope of the weight change is greater than the upper limit of the weight increasing slope.

[0026] EL4. Time the time when the average slope of the weight change is greater than the upper limit of the weight increasing slope to obtain the duration. Compare the duration with the value ten. If the duration is less than or equal to ten, then go to EL3.

[0027] EL5. Manually confirm whether to continue. If the manual selection is yes, then reset the duration to zero and go to EL3. If the manual selection is no, then execute the filling end process and finally end the filling.

[0028] Furthermore, the weight parameters used in the filling rate detection and judgment path are the cylinder's own weight, the weight of the cylinder accessories, the maximum filling weight of the cylinder, the target filling weight of the cylinder, the upper limit of the weight increasing slope, the lower limit of the weight increasing slope, and the time for calculating the slope with time delay. The specific steps are as follows:

[0029] EV1. The current total weight is less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the maximum filling weight of the cylinder.

[0030] EV2. The current total weight is greater than or equal to the sum of the cylinder's own weight, the weight of the cylinder accessories, and the target filling weight of the cylinder.

[0031] EV3. Calculate the average slope of the weight change every two seconds, and the average slope of the weight change is less than or equal to the upper limit of the weight increasing slope.

[0032] EV4. Compare and judge the average slope of the weight change with the lower limit of the weight increase slope. If the average slope of the weight change is greater than the lower limit of the weight increase slope, go to S2;

[0033] EV5. Compare and judge the current timing value of the filling timer with the slope calculation delay time. If the current timing value of the filling timer is less than the slope calculation delay time, go to S2;

[0034] EV6. Manually confirm whether to continue. If the manual selection is yes, reset the current timing value of the filling timer to zero and go to S2. If the manual selection is no, execute the filling end process and finally end the filling.

[0035] Furthermore, the pressure parameters used for monitoring and judging the air pressure in the gas cylinder are the filling high interlock pressure, the highest pressure for pressure relief, and the target high pressure for pressure relief. The specific steps for monitoring and judging the air pressure in the gas cylinder are as follows:

[0036] Ep1. Compare and judge the current pressure of the transmitter with the filling high interlock pressure. If the current pressure of the transmitter is less than the filling high interlock pressure, go to E101; otherwise, go to Ep2;

[0037] Ep101. Close the filling valve V1 and open the vent valve V2 to automatically vent the gas cylinder;

[0038] Ep102. If the current pressure of the pressure transmitter is greater than or equal to the highest pressure for pressure relief, go to E101; otherwise, go to Ep3;

[0039] Ep2. If the current pressure of the pressure transmitter is greater than or equal to the highest pressure for pressure relief, go to S2; otherwise, go to Ep3;

[0040] Ep3. Close the filling valve V1;

[0041] Ep4. Initialize the venting times to zero;

[0042] Ep5. Open the vent valve V2 and increment the venting times by 1;

[0043] Ep6. If the current pressure of the transmitter is less than the target high pressure for pressure relief, close the vent valve V2 and go to S2; otherwise, go to Ep7;

[0044] Ep7. If the venting times are greater than or equal to 3, go to Ep5; otherwise, go to Ep8;

[0045] Ep8. Flash the yellow light for alarm and close the vent valve V2;

[0046] Ep9. Manually confirm whether to continue. If the manual selection is yes, go to Ep4; if the manual selection is no, execute the filling end process and finally end the filling.

[0047] Furthermore,

[0048] The pre - filling pretreatment includes filling preparation, pre - filling pressure relief of the gas cylinder, pre - filling replacement of the gas cylinder, and pre - filling vacuum of the gas cylinder.

[0049] Furthermore,

[0050] There are three filling modes included in the filling preparation. The three filling modes are: PDA code scanning, local filling, and local code scanning. Description of the Drawings

[0051] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0052] Figure 1 is the overall flow chart of the present invention;

[0053] Figure 2 is the flow chart of the maximum weight judgment path;

[0054] Figure 3 is the flow chart of the target filling weight judgment path;

[0055] Figure 4 is the flow chart of the weight slope increase path;

[0056] Figure 5 is the flow chart of the filling rate detection and judgment path

[0057] Figure 6 is the pre - filling pretreatment flow chart. Detailed Implementation Modes

[0058] The following combines the embodiments and the drawings to further elaborate on the present invention in detail, but the implementation modes of the present invention are not limited thereto. Embodiment

[0059] Refer to Figures 1 to 6

[0060] A filling control method for an electronic scale weighing controller for liquefied gas filling. Different types of gas cylinder weight parameters and pressure parameters are preset in the electronic scale weighing controller. The filling control method includes the following steps:

[0061] S1. Start the electronic scale weighing controller, select the specification of the gas cylinder to be filled to obtain the weight parameters and pressure parameters of the gas cylinder to be filled. The electronic scale weighing controller controls the opening of the vent valve V2 and the vacuum valve V3, closes the filling valve V1, and performs pre - filling pretreatment on the gas cylinder to be filled;

[0062] S2. The electronic scale weighing controller closes the vent valves V2 and V3, opens the filling valve V1, records the filling information, sends a pump - starting signal for filling, and the filling timer starts timing;

[0063] S3. Compare the current timing value of the filling timer with the maximum timing value specified for the filling timer. If the current timing value is greater than the maximum timing value, go to S4; if the current timing value is less than the maximum timing value, go to S5;

[0064] S4. The indicator light flashes to remind, and manually confirm whether to continue filling. If so, go to S2 and reset the current timing value of the filling timer to zero; if not, close the filling valve V1 and execute the filling end process to end the filling;

[0065] S5. The electronic scale weighing controller obtains the current total weight through the weighing sensor and the current pressure of the pressure transmitter in the gas cylinder through the pressure transmitter. Use the obtained current total weight and weight parameters to monitor the current total weight and the filling rate of the gas cylinder. At the same time, use the current pressure of the pressure transmitter in the cylinder and the pressure parameters to monitor and judge the air pressure generated after the liquefied gas vaporizes due to the external temperature in the gas cylinder. At the same time, monitor the weight and pressure to ensure the filling of the gas cylinder.

[0066] Further, the monitoring of the current total weight and the filling rate of the gas cylinder using the obtained current total weight and weight parameters has four judgment paths, and the four judgment paths are specifically: the maximum weight judgment path, the target filling weight judgment path, the weight slope increase path, and the filling rate detection judgment path.

[0067] Further, the weight parameters used in the maximum weight judgment path are the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder. The specific steps are as follows:

[0068] E MAX1 . If the current total weight is greater than or equal to the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder, the red light flashes to alarm;

[0069] E MAX2 . Close the filling valve V1 and open the vent valve V2;

[0070] E MAX3 . If the current total weight is greater than the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the target filling weight of the gas cylinder, go to E MAX2 , otherwise go to E MAX4 ;

[0071] E MAX4 . After closing the vent valve V2, execute the filling end process to finally end the filling.

[0072] Determine the specifications of the gas cylinder based on the pre - treatment before filling. The electronic scale weighing controller thus obtains a series of preset parameters for gas cylinders of this specification. The maximum weight judgment path utilizes the self - weight of the gas cylinder, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder among the preset parameters of gas cylinders of this specification. The weight of the gas cylinder accessories refers to the total weight of components such as the valve and the cap on the gas cylinder. Then, the sum of the self - weight of the gas cylinder, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder represents the maximum weight of the gas cylinder of this specification when filled with liquid gas. Therefore, the current total weight is compared with the sum of the self - weight of the gas cylinder, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder. When the current total weight is greater than the maximum weight of the gas cylinder of this specification when filled with liquid gas, control the opening and closing of the filling valves V1 and V2 to discharge the excess gas until the current total weight is less than or equal to the maximum weight of the gas cylinder of this specification when filled with liquid gas, then close the vent valve V2 to stop the gas discharge and execute the filling end process to complete the filling. The purpose of this maximum weight judgment path is to prevent the gas cylinder from being overloaded and ensure the safety of the filling process.

[0073] Furthermore, the weight parameters used in the target filling weight judgment path are the self - weight of the gas cylinder, the weight of the gas cylinder accessories, the maximum filling weight of the gas cylinder, and the target filling weight of the gas cylinder. The specific steps are as follows:

[0074] EM1. The current total weight is less than the sum of the self - weight of the gas cylinder, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder;

[0075] EM2. The current total weight is greater than or equal to the sum of the self - weight of the gas cylinder, the weight of the gas cylinder accessories, and the target filling weight of the gas cylinder;

[0076] EM3. After closing the filling valve V1, execute the filling end process and finally end the filling.

[0077] The target filling weight judgment path utilizes both the cylinder parameters used in the maximum weight judgment path and the cylinder filling target weight parameter. The cylinder filling target weight refers to the target weight of the gas to be filled into a cylinder of this specification. First, it also compares the current total weight with the sum of the cylinder's own weight, the weight of the cylinder accessories, and the maximum filling weight of the cylinder. When the current total weight is less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the maximum filling weight of the cylinder, it means the cylinder can continue to be filled. Then, it compares the current total weight with the sum of the cylinder's own weight, the weight of the cylinder accessories, and the cylinder filling target weight. The sum of the cylinder's own weight, the weight of the cylinder accessories, and the cylinder filling target weight represents the target weight of the cylinder set in the workshop. Therefore, the above comparison is between the current total weight and the target weight of the cylinder. When the current total weight is greater than or equal to the target weight of the cylinder, the filling valve V1 is closed and the filling end process is executed to complete the filling of the cylinder. The purpose of this target filling weight judgment path is to ensure that the cylinder is filled to the preset target weight and avoid overfilling.

[0078] Furthermore, the weight parameters used in the weight slope increase path are the cylinder's own weight, the weight of the cylinder accessories, the maximum filling weight of the cylinder, the cylinder filling target weight, and the upper limit of the weight increase slope. The specific steps are as follows:

[0079] EL1. The current total weight is less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the maximum filling weight of the cylinder;

[0080] EL2. The current total weight is greater than or equal to the sum of the cylinder's own weight, the weight of the cylinder accessories, and the cylinder filling target weight;

[0081] EL3. Calculate the average slope of the weight change every two seconds, and the average slope of the weight change is greater than the upper limit of the weight increase slope;

[0082] EL4. Time the time when the average slope of the weight change is greater than the upper limit of the weight increase slope to obtain the duration. Compare the duration with the value ten. If the duration is less than or equal to ten, then go to EL3;

[0083] EL5. Manually confirm whether to continue. If the manual selection is yes, the duration is reset to zero and go to EL3. If the manual selection is no, execute the filling end process and finally end the filling.

[0084] The weight slope increase path uses all the parameters of cylinders of this specification and the upper limit of the weight increase slope used in the target filling weight judgment path. When the current total weight is less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the maximum filling weight of the cylinder, and also less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the target filling weight of the cylinder, calculate the average slope of the weight change every two seconds, and time the duration when the average slope of the weight change is greater than the upper limit of the weight increase slope to obtain the duration, and then judge the duration. If the duration is greater than ten, manual confirmation is required to determine whether to continue. If the selection is yes, reset the duration to zero and repeat the above steps of calculating the average slope of the weight change every two seconds and judging the duration. If the selection is no, execute the filling end process and complete the filling;

[0085] If the duration is less than ten, calculate the average slope of the weight change every two seconds again, and then judge the duration until the duration is greater than ten and the above manual confirmation step is performed.

[0086] This weight slope increase path prevents the filling rate from being too fast, resulting in overfilling of the cylinder, and ensures the smoothness and safety of the filling process.

[0087] Furthermore, the weight parameters used in the filling rate detection and judgment path are the cylinder's own weight, the weight of the cylinder accessories, the maximum filling weight of the cylinder, the target filling weight of the cylinder, the upper limit of the weight increase slope, the lower limit of the weight increase slope, and the time for calculating the slope with time delay. The specific steps are as follows:

[0088] EV1. The current total weight is less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the maximum filling weight of the cylinder;

[0089] EV2. The current total weight is greater than or equal to the sum of the cylinder's own weight, the weight of the cylinder accessories, and the target filling weight of the cylinder;

[0090] EV3. Calculate the average slope of the weight change every two seconds, and the average slope of the weight change is less than or equal to the upper limit of the weight increase slope;

[0091] EV4. Compare and judge the average slope of the weight change with the lower limit of the weight increase slope. If the average slope of the weight change is greater than the lower limit of the weight increase slope, go to S2;

[0092] EV5. Compare and judge the current timing value of the filling timer with the time for calculating the slope with time delay. If the current timing value of the filling timer is less than the time for calculating the slope with time delay, go to S2;

[0093] EV6. Manually confirm whether to continue. If the manual selection is yes, reset the current timing value of the filling timer to zero and go to S2. If the manual selection is no, execute the filling end process and finally end the filling.

[0094] The filling rate detection and judgment path uses all the parameters of the weight slope increase path, as well as the lower limit of the weight increase slope and the delay calculation slope time. When the current total weight successively satisfies being less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the maximum filling weight of the cylinder, and the current total weight is less than the sum of the cylinder's own weight, the weight of the cylinder accessories, and the target filling weight of the cylinder, and the average weight change slope is less than or equal to the upper limit of the weight increase slope, and the average weight change slope is less than the lower limit of the weight increase slope, the current timing value of the filling timer is compared with the delay calculation slope time. If the current timing value of the filling timer is greater than the delay calculation slope time, the yellow light will flash to indicate that the filling rate is too slow, and then it will enter the step of manual confirmation whether to proceed;

[0095] The purpose of this filling rate detection and judgment path is to ensure that the filling rate is within a reasonable range and avoid the filling process from being too slow or stagnant.

[0096] To sum up, the cylinder weight monitoring and judgment uses the current total weight, the duration, the average weight change slope in two seconds, and the current timing value of the filling timer to compare and judge with the preset cylinder parameters of this specification, ensuring the reasonableness of the filling speed and the safety of filling during the filling process of the cylinder from the aspects of the cylinder weight and the cylinder weight increase rate.

[0097] Furthermore, the pressure parameters used for monitoring and judging the air pressure in the cylinder are the filling high interlock pressure, the highest pressure relief pressure, and the target high pressure relief pressure. The specific steps for monitoring and judging the air pressure in the cylinder are as follows:

[0098] Ep1. Compare and judge the current pressure of the transmitter with the filling high interlock pressure. If the current pressure of the transmitter is less than the filling high interlock pressure, go to E101; otherwise, go to Ep2;

[0099] Ep101. Close the filling valve V1 and open the vent valve V2 to automatically vent the cylinder;

[0100] Ep102. If the current pressure of the pressure transmitter is greater than or equal to the highest pressure relief pressure, go to E101; otherwise, go to Ep3;

[0101] Ep2. If the current pressure of the pressure transmitter is greater than or equal to the highest pressure relief pressure, then go to S2; otherwise, go to Ep3;

[0102] Ep3. Close the filling valve V1;

[0103] Ep4. Initialize the number of venting times to zero;

[0104] Ep5. Open the vent valve V2 and increment the number of venting times by 1;

[0105] Ep6. If the current pressure of the transmitter is less than the high pressure of the pressure relief target, close the vent valve V2 and transfer to S2; otherwise, transfer to Ep7.

[0106] Ep7. If the number of venting times is greater than or equal to 3, transfer to Ep5; otherwise, transfer to Ep8.

[0107] Ep8. Flash the yellow light for alarm and close the vent valve V2.

[0108] Ep9. Manually confirm whether to continue. If the manual selection is "yes", transfer to Ep4; if the manual selection is "no", execute the filling end process and finally end the filling.

[0109] Liquid gas is filled into the gas cylinder. The liquid gas filled into the gas cylinder will cause some liquid gas to vaporize into gaseous state due to the external environmental temperature, resulting in a change in the gas pressure inside the gas cylinder. If the gas pressure inside the gas cylinder is too high, there will even be potential safety hazards. Therefore, it is necessary to monitor the gas pressure inside the gas cylinder, and the monitoring of the gas pressure inside the gas cylinder is carried out synchronously with the above-mentioned monitoring of the gas cylinder weight.

[0110] The monitoring and judgment of the gas pressure inside the gas cylinder utilize the filling high interlock pressure, the highest pressure of pressure relief, and the high pressure of the pressure relief target to monitor the gas pressure inside the gas cylinder with the current pressure of the pressure transmitter. The filling high interlock pressure refers to the preset maximum pressure limit value inside the gas cylinder in the weighing controller of the electronic scale. The highest pressure of pressure relief refers to the critical value at which the pressure in the gas cylinder needs to be discharged to the outside of the gas cylinder when the pressure reaches a certain value. The high pressure of the pressure relief target refers to the minimum value of the gas pressure generated inside the gas cylinder when the vaporized part of the liquid gas becomes gaseous. And the value of the filling high interlock pressure is greater than the values of the highest pressure of pressure relief and the high pressure of the pressure relief target, and the highest pressure of pressure relief is greater than the high pressure of the pressure relief target.

[0111] The monitoring and judgment path of the gas pressure inside the gas cylinder first compares the value of the pressure transmitter with the filling high interlock pressure, and divides the filled gas cylinders into two categories. One category is that the gas pressure inside the gas cylinder has exceeded the filling high interlock pressure. Then, it is necessary to relieve the pressure of this category of gas cylinders. Therefore, close the filling valve V1 to stop filling, open the vent valve V2 to release the gas for pressure relief. After that, the current pressure of the pressure transmitter of this category of gas cylinders is compared with the highest pressure of pressure relief again. If the current pressure of the pressure transmitter of this category of gas cylinders is less than the highest pressure of pressure relief, continue to close the filling valve V1 to stop filling, open the vent valve V2 to release the gas for pressure relief until it is less than the highest pressure of pressure relief. When the current pressure of the pressure transmitter of this category of gas cylinders is less than the highest pressure of pressure relief, this category of gas cylinders becomes refillable gas cylinders. The other category is that the gas pressure inside the gas cylinder is less than the filling high interlock pressure and the current pressure of the pressure transmitter of the other category of gas cylinders is greater than the highest pressure of pressure relief, then the other category of gas cylinders is pressure relief gas cylinders.

[0112] Both of the above two gas cylinders stop filling, and the number of generated venting times is set to zero. Open the vent valve V2 for venting, and the number of venting times is incremented by 1. Then, compare the current pressure of the pressure transmitter with the high pressure target for pressure relief. If the current pressure of the pressure transmitter is less than the high pressure target for pressure relief, it indicates that the gas cylinder may not need pressure relief, perhaps due to insufficient filling of the gas cylinder. Then, close the vent valve V2 to stop venting and go to step S2 above. If the current pressure of the pressure transmitter is greater than or equal to the high pressure target for pressure relief, it indicates that the gas cylinder needs pressure relief. Then, compare the number of venting times of the gas cylinder that needs pressure relief with the value 3. If the number of venting times of the gas cylinder is less than or equal to 3, continue to vent and increment the number of venting times by 1. Again, compare the current pressure of the pressure transmitter with the high pressure target for pressure relief and compare the number of venting times with the value 3 in sequence until the number of venting times is greater than 3. Then, close the vent valve V2 to stop venting. After that, manually confirm whether to continue. If the choice is yes, then jump to the step where the number of venting times is equal to zero, and then execute the above steps sequentially downward from the jumped-to step. If the choice is no, then execute the filling end process to end the filling.

[0113] Further,

[0114] It includes filling preparation, pressure relief of the gas cylinder before filling, replacement of the gas cylinder before filling, and vacuum of the gas cylinder before filling.

[0115] The purpose of pressure relief of the gas cylinder before filling is to discharge the gaseous gas existing in the gas cylinder, avoiding the mixing of different gases during filling and causing the target gas to be contaminated. At the same time, pressure relief of the gas cylinder before filling also makes the result of the pressure transmitter monitoring the pressure inside the gas cylinder more accurate. And the current air pressure of the pressure transmitter is used as the basic data for monitoring and judging the air pressure inside the entire gas cylinder. Therefore, the accuracy and authenticity of the air pressure monitoring inside the gas cylinder have a high credibility.

[0116] The vacuum of the gas cylinder before filling is to make the air pressure inside each gas cylinder in the same state during filling. During the filling of the gas cylinder, it is possible that the residual other gases and the filled gases in the gas cylinder are mixed in a certain proportion, which may cause an explosion. Therefore, evacuating the gas cylinder to a vacuum state avoids the occurrence of such situations and ensures the safety during the filling process.

[0117] The replacement of the gas cylinder before filling mainly ensures that the gas cylinder is in a safe state before filling through these pretreatment operations, avoiding potential safety hazards during the filling process due to residual gas or pressure inside the gas cylinder.

[0118] Further,

[0119] The filling preparation includes three filling modes, which are: PDA scanning code, local filling, and local scanning code.

[0120] Different filling modes are adopted to meet different operation requirements, improving the flexibility and efficiency of the filling process. Each mode has its specific operation process to ensure the accuracy and safety of the filling process.

[0121] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention / invention. However, the present invention / invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention / invention, and these modifications and improvements are also regarded as the protection scope of the present invention / invention.

Claims

1. An electronic scale weighing controller filling control method for liquefied gas filling, characterized in that The weight parameters and pressure parameters of different types of gas cylinders are preset in the electronic scale weighing controller. The weight parameters include the self-weight of the gas cylinder, the weight of the gas cylinder accessories, the maximum filling weight of the gas cylinder, the target filling weight of the gas cylinder, the upper limit of the weight increase slope, and the lower limit of the weight increase slope. The pressure parameters include the filling high interlock pressure, the highest pressure for pressure relief, and the target high pressure for pressure relief. The filling control method includes the following steps: S1. Start the electronic scale weighing controller, select the specification of the gas cylinder to be filled to obtain the weight parameters and pressure parameters of the gas cylinder to be filled. The electronic scale weighing controller controls the emptying valve V2 and the vacuum valve V3 to open, closes the filling valve V1, and performs pre-treatments such as filling preparation, pressure relief, replacement, and vacuum on the gas cylinder to be filled in sequence. S2. The electronic scale weighing controller closes the emptying valves V2 and V3, opens the filling valve V1, records the filling information, sends a pump start signal for filling, and the filling timer starts timing. S3. Compare the current timing value of the filling timer with the specified maximum timing value. If the current timing value is greater than the maximum timing value, go to S4; if it is less, go to S5. S4. The indicator light flashes to remind, and manually confirm whether to continue filling. If so, go to S2 and reset the filling timer; if not, close the filling valve V1 and execute the filling end process. S5. The electronic scale weighing controller obtains the current total weight through the weighing sensor and the current pressure of the pressure transmitter in the gas cylinder through the pressure transmitter. It monitors the current total weight and the filling rate of the gas cylinder by using the obtained current total weight and weight parameters. At the same time, it monitors and judges the air pressure generated after the liquefied gas vaporizes due to the external temperature in the gas cylinder by using the current pressure of the pressure transmitter in the bottle and the pressure parameters. At the same time, it monitors the weight and pressure to ensure the filling of the gas cylinder. Among them, the monitoring of the filling rate is to calculate the average slope of the weight change every two seconds, and compare it with the upper limit of the weight increase slope and the lower limit of the weight increase slope. If the average slope of the weight change is greater than the upper limit of the weight increase slope and the duration exceeds ten seconds, trigger a manual confirmation of whether to continue; if the average slope of the weight change is less than the lower limit of the weight increase slope and the filling timer times out the delay calculation slope time, prompt for manual intervention. The air pressure monitoring and judgment is that if the current pressure of the pressure transmitter is less than the filling high interlock pressure, close the filling valve V1 and open the emptying valve V2 to automatically empty until the pressure is less than the target high pressure for pressure relief; if the current pressure of the pressure transmitter is greater than or equal to the highest pressure for pressure relief, empty in a loop according to the preset number of times until the pressure reaches the standard or an alarm is given and then manually confirm.

2. The filling control method of the electronic scale weighing controller for liquefied gas filling according to claim 1, characterized in that, The monitoring of the current total weight and the filling rate of the gas cylinder by using the obtained current total weight and weight parameters has at least one of four judgment paths. The four judgment paths are specifically: the maximum weight judgment path, the target filling weight judgment path, the weight slope increase path, and the filling rate detection judgment path.

3. The filling control method of the electronic scale weighing controller for liquefied gas filling according to claim 2, characterized in that, The weight parameters used in the maximum weight judgment path are the self-weight of the gas cylinder, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder. The specific steps are as follows: E MAX1 . When the current total weight is greater than or equal to the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder, the red light flashes to give an alarm; E MAX2 . Close the filling valve V1 and open the vent valve V2; E MAX3 .If the current total weight is greater than the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the target filling weight of the gas cylinder, go to E2; otherwise, go to E4; E MAX4 . After closing the vent valve V2, execute the filling end process and finally end the filling.

4. The filling control method of an electronic scale weighing controller for liquefied gas filling according to claim 2, characterized in that, The weight parameters used in the target filling weight judgment path are the weight of the gas cylinder itself, the weight of the gas cylinder accessories, the maximum filling weight of the gas cylinder, and the target filling weight of the gas cylinder. The specific steps are as follows: EM1. The current total weight is less than the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder; EM2. The current total weight is greater than or equal to the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the target filling weight of the gas cylinder; EM3. After closing the filling valve V1, execute the filling end process and finally end the filling.

5. The filling control method of an electronic scale weighing controller for liquefied gas filling according to claim 2, characterized in that, The weight parameters used in the weight slope increase path are the weight of the gas cylinder itself, the weight of the gas cylinder accessories, the maximum filling weight of the gas cylinder, the target filling weight of the gas cylinder, and the upper limit of the weight increase slope. The specific steps are as follows: EL1. The current total weight is less than the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder; EL2. The current total weight is greater than or equal to the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the target filling weight of the gas cylinder; EL3. Calculate the average slope of the weight change every two seconds, and the average slope of the weight change is greater than the upper limit of the weight increase slope; EL4. Time the time when the average slope of the weight change is greater than the upper limit of the weight increase slope to obtain the duration. Compare the duration with the value ten. If the duration is less than or equal to ten, then go to EL3; EL5. Manually confirm whether to continue. If the manual selection is yes, the duration is reset to zero and go to EL3. If the manual selection is no, execute the filling end process and finally end the filling.

6. The filling control method of an electronic scale weighing controller for liquefied gas filling according to claim 2, characterized in that, The weight parameters used in the filling rate detection and judgment path are the weight of the gas cylinder itself, the weight of the gas cylinder accessories, the maximum filling weight of the gas cylinder, the target filling weight of the gas cylinder, the upper limit of the weight increase slope, the lower limit of the weight increase slope, and the time for calculating the slope with delay. The specific steps are as follows: EV1. The current total weight is less than the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder; EV2. The current total weight is greater than or equal to the sum of the weight of the gas cylinder itself, the weight of the gas cylinder accessories, and the target filling weight of the gas cylinder; EV3. Calculate the average slope of the weight change every two seconds, and the average slope of the weight change is less than or equal to the upper limit of the weight increase slope; EV4. Compare and judge the average slope of the weight change with the lower limit of the weight increase slope. If the average slope of the weight change is greater than the lower limit of the weight increase slope, then go to S2; EV5. Compare and judge the current timing value of the filling timer with the time for calculating the slope with delay. If the current timing value of the filling timer is less than the time for calculating the slope with delay, then go to S2; EV6. Manually confirm whether to continue. If the manual selection is yes, the current timing value of the filling timer is reset to zero and go to S2. If the manual selection is no, execute the filling end process and finally end the filling.

7. The filling control method of an electronic scale weighing controller for liquefied gas filling according to claim 1, characterized in that, The pressure parameters used for monitoring and judging the air pressure in the gas cylinder are the filling high interlock pressure, the highest pressure for pressure relief, and the target high pressure for pressure relief. The specific steps for monitoring and judging the air pressure in the gas cylinder are as follows: Ep1. Compare and judge the current pressure of the transmitter with the filling high interlock pressure. If the current pressure of the transmitter is less than the filling high interlock pressure, then go to E101. Otherwise, go to Ep2; Ep101. Close the filling valve V1, open the vent valve V2, and automatically vent the gas cylinder. Ep102. If the current pressure of the pressure transmitter is greater than or equal to the maximum pressure relief value, go to E101; otherwise, go to Ep3. Ep2. If the current pressure of the pressure transmitter is greater than or equal to the maximum pressure relief value, then go to S2; otherwise, go to Ep3. Ep3. Close the filling valve V1. Ep4. Initialize the venting times to zero. Ep5. Open the vent valve V2 and increment the venting times by 1. Ep6. If the current pressure of the transmitter is less than the target high pressure for pressure relief, then close the vent valve V2 and go to S2; otherwise, go to Ep7. Ep7. If the venting times are greater than or equal to 3, then go to Ep5; otherwise, go to Ep8. Ep8. The yellow light flashes for alarm and the vent valve V2 is closed. Ep9. Manually confirm whether to continue. If the manual selection is yes, go to Ep4; if the manual selection is no, execute the filling end process and finally end the filling.

8. A filling control method for an electronic scale weighing controller for liquefied gas filling according to claim 1, characterized in that The pre - filling pretreatment includes filling preparation, gas cylinder pressure relief before filling, gas cylinder replacement before filling, and gas cylinder vacuum before filling.

9. The filling control method of an electronic scale weighing controller for liquefied gas filling according to claim 8, characterized in that, The filling preparation includes three filling modes, which are: PDA barcode scanning, local filling, and local barcode scanning.

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