Filling control method of electronic scale weighing controller for liquefied gas filling

Abstract

The invention discloses a filling control method of an electronic scale weighing controller for liquefied gas filling, which comprises the following steps: presetting parameters of different types of gas cylinders, controlling a valve switch to perform filling through the electronic scale weighing controller, and monitoring the weight of the gas cylinders and the gas pressure in the gas cylinders at the same time. The weight monitoring comprises four judgment paths of maximum weight, target filling weight, weight slope increase and filling speed detection, and rationality and safety of the filling speed are ensured. And the air pressure monitoring performs pressure relief processing by comparing the current pressure with a preset value. The pretreatment before filling comprises filling preparation, pressure relief, replacement and vacuum treatment, so that the safety of the gas cylinder is ensured. PDA code scanning, local filling and local code scanning modes are provided for filling preparation, different requirements are met, the flexibility and efficiency of the filling process are improved, and the accuracy and safety of the filling process are ensured.

Description

Technical Field

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

[0002] Liquefied gas filling is a common operation in industrial production and daily life, and is widely used in the fields of medical, chemical, energy, etc. 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 experience judgment, and there are problems such as inaccurate filling volume, unstable filling speed, and great safety hazards. With the development of automation technology, electronic scale weighing controllers are gradually used in the liquefied gas filling process. By presetting gas cylinder parameters and real-time monitoring of the filling process, it can effectively improve the filling accuracy and safety.

[0003] However, the existing electronic scale weighing controller still has some shortcomings in the filling process. For example, the monitoring of the weight and air pressure of the gas cylinder during the filling process is not comprehensive enough, which can easily lead to overfilling or underfilling; the filling rate control is not precise enough, which may cause the filling speed to be too fast or too slow, affecting the filling efficiency and safety; in addition, the existing controller lacks an effective automatic pressure relief mechanism when dealing with changes in the air pressure in the gas cylinder, which may cause the air pressure in the gas cylinder to be too high, posing a safety hazard. Therefore, it is of great practical significance to develop an electronic scale weighing controller that can comprehensively monitor the weight and air pressure of the gas cylinder, accurately control the filling rate, and has an automatic pressure relief function. Summary of the invention

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

[0005] The present invention is achieved through the following technical solutions: A filling control method of an electronic scale weighing controller for filling liquefied gas, wherein the weight parameters and pressure parameters of gas cylinders of different models are preset in the electronic scale weighing controller, and the filling control method comprises the following steps: S1. Start the electronic weighing controller, select the specifications of the gas cylinder to be filled to obtain the weight parameters and pressure parameters of the gas cylinder to be filled, the electronic weighing controller controls the vent valve V2, the vacuum valve V3 to open, close the filling valve V1, and pre-treat the gas cylinder to be filled before filling; S2. The electronic 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; S3. Compare the current timing value of the filling timer with the maximum timing value specified by 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; S4. The indicator light flashes to remind you to manually confirm whether to continue filling. If yes, go to S2 and reset the current value of the filling timer to zero. If no, close the filling valve V1 and execute the filling end process to end the filling. 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. The current total weight and weight parameters obtained are used to monitor the current total weight and the filling rate of the gas cylinder. At the same time, the current pressure and pressure parameters of the pressure transmitter in the cylinder are used to monitor and judge the air pressure generated by the vaporization of liquefied gas in the gas cylinder due to the external temperature. At the same time, weight and pressure monitoring are performed to ensure the filling of the gas cylinder.

[0006] Furthermore, the use of the acquired current total weight and weight parameters to monitor the current total weight and the filling rate of the gas cylinder has four judgment paths, and the four judgment paths are specifically: maximum weight judgment path, target filling weight judgment path, weight slope increase path, and filling rate detection judgment path.

[0007] Furthermore, the weight parameters used in the maximum weight judgment path include 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: 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 will flash to alarm; E MAX2 .Close the filling valve V1 and open the drain valve V2; E MAX3 . 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 weight of the gas cylinder filling. MAX2 Otherwise, switch to E MAX4 ; E MAX4 .After closing the vent valve V2, execute the filling end process and finally end the filling.

[0008] Furthermore, the weight parameters used in the target filling weight judgment path include 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: 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 weight of the gas cylinder filling; EM3. After closing the filling valve V1, the filling end process is executed to finally end the filling.

[0009] Furthermore, the weight parameters used in the weight slope increase path include 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: 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 weight of the gas cylinder filling; EL3. Calculate the average slope of weight change every two seconds, and the average slope of weight change is greater than the upper limit of weight increase slope; EL4. Count the time when the average slope of weight change is greater than the upper limit of weight increase slope to obtain duration, compare the duration with the value of ten, if the duration is less than or equal to ten, go to EL3; EL5. Manual confirmation whether to continue. If it is selected as yes, the duration will be reset to zero and transfer to EL3. If it is selected as no, the filling end process will be executed and the filling will be finally ended.

[0010] Furthermore, the weight parameters used in the filling rate detection and judgment path include the weight of the gas cylinder itself, the weight of the gas cylinder accessories, the maximum filling weight of the gas cylinder, the filling target weight of the gas cylinder, the upper limit of the weight increase slope, the lower limit of the weight increase slope, and the delay calculation slope time. The specific steps are: 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 weight of the gas cylinder filling; EV3. Calculate the average slope of weight change every two seconds, and the average slope of weight change is less than or equal to the upper limit of weight increase slope; EV4. Compare the average slope of weight change with the lower limit of weight increase slope. If the average slope of weight change is greater than the lower limit of weight increase slope, go to S2. EV5. Compare the current timing value of the filling timer with the delay calculation slope time. If the current timing value of the filling timer is less than the delay calculation slope time, go to S2; EV6. Manual confirmation whether to continue. If the manual selection is yes, the current timing value of the filling timer is reset to zero and the process goes to S2. If the manual selection is no, the filling end process is executed and the filling is finally ended.

[0011] Furthermore, the pressure parameters used for monitoring and judging the gas pressure in the gas cylinder are the filling high interlocking pressure, the maximum pressure of pressure relief, and the target high pressure of pressure relief. The specific steps for monitoring and judging the gas pressure in the gas cylinder are: Ep1. Compare 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; Ep101. Close the filling valve V1, open the emptying valve V2, and automatically empty the gas cylinder; Ep102. If the current pressure of the pressure transmitter is greater than or equal to the maximum pressure of pressure relief, 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 of pressure relief, then go to S2, otherwise go to Ep3; Ep3. Close the filling valve V1; Ep4. Initialize the number of emptying times to zero; Ep5. Open the venting valve V2 and increase the venting times by 1; Ep6. If the current pressure of the transmitter is lower than the target high pressure of pressure relief, close the vent valve V2 and turn to S2, otherwise turn to Ep7; Ep7. If the number of emptying is greater than or equal to 3, go to Ep5, otherwise go to Ep8; Ep8. The yellow light flashes to give an alarm and the vent valve V2 is closed; Ep9. Manual confirmation whether to continue. If yes, go to Ep4. If no, execute the filling end process and finally end the filling.

[0012] Furthermore, The pre-filling pretreatment includes filling preparation, gas cylinder pressure relief before filling, gas cylinder replacement before filling, and gas cylinder vacuum before filling.

[0013] Furthermore, The filling preparation includes three filling modes, which are: PDA code scanning, local filling, and local code scanning. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 It is the whole flow chart of the present invention; Figure 2 It is the maximum weight judgment path flow chart; Figure 3 A flow chart of the target filling weight determination path; Figure 4 Flow chart for the weight slope increase path; Figure 5 Flow chart of the filling rate detection judgment path Figure 6 This is the flow chart of pre-treatment before filling. DETAILED DESCRIPTION

[0015] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto. Example

[0016] See also Figures 1 to 6 A filling control method of an electronic scale weighing controller for filling liquefied gas, wherein the weight parameters and pressure parameters of gas cylinders of different models are preset in the electronic scale weighing controller, and the filling control method comprises the following steps: S1. Start the electronic weighing controller, select the specifications of the gas cylinder to be filled to obtain the weight parameters and pressure parameters of the gas cylinder to be filled, the electronic weighing controller controls the vent valve V2, the vacuum valve V3 to open, close the filling valve V1, and pre-treat the gas cylinder to be filled before filling; S2. The electronic 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; S3. Compare the current timing value of the filling timer with the maximum timing value specified by 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; S4. The indicator light flashes to remind you to manually confirm whether to continue filling. If yes, go to S2 and reset the current value of the filling timer to zero. If no, close the filling valve V1 and execute the filling end process to end the filling. 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. The current total weight and weight parameters obtained are used to monitor the current total weight and the filling rate of the gas cylinder. At the same time, the current pressure and pressure parameters of the pressure transmitter in the cylinder are used to monitor and judge the air pressure generated by the vaporization of liquefied gas in the gas cylinder due to the external temperature. At the same time, weight and pressure monitoring are performed to ensure the filling of the gas cylinder.

[0017] Furthermore, the use of the acquired current total weight and weight parameters to monitor the current total weight and the filling rate of the gas cylinder has four judgment paths, and the four judgment paths are specifically: maximum weight judgment path, target filling weight judgment path, weight slope increase path, and filling rate detection judgment path.

[0018] Furthermore, the weight parameters used in the maximum weight judgment path include 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: 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 will flash to alarm; E MAX2 .Close the filling valve V1 and open the drain valve V2; E MAX3 . 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 weight of the gas cylinder filling. MAX2 Otherwise, switch to E MAX4 ; E MAX4 .After closing the vent valve V2, execute the filling end process and finally end the filling.

[0019] According to the pre-processing before filling, the specifications of the gas cylinder are determined, and the electronic scale weighing controller obtains a series of preset parameters of the gas cylinder of this specification. The maximum weight judgment path uses the gas cylinder's own weight, the weight of the gas cylinder accessories, and the maximum filling weight of the gas cylinder in the preset parameters of the gas cylinder of this specification. The weight of the gas cylinder accessories refers to the total weight of the gas cylinder such as the bottle valve and the bottle cap. Then the sum of the gas cylinder's own weight, 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 it is filled with liquid gas. Therefore, the current total weight is compared with the sum of the gas cylinder's own weight, 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 it is filled with liquid gas, the filling valves V1 and V2 are controlled to be opened and closed to discharge excess gas. When the current total weight is less than or equal to the maximum weight of the gas cylinder of this specification when it is filled with liquid gas, the vent valve V2 is closed to stop the gas discharge and the filling end process is executed to complete the filling. The purpose of the maximum weight judgment path is to prevent the gas cylinder from being overloaded and ensure the safety of the filling process.

[0020] Furthermore, the weight parameters used in the target filling weight judgment path include 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: 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 weight of the gas cylinder filling; EM3. After closing the filling valve V1, the filling end process is executed to finally end the filling.

[0021] The target filling weight judgment path uses both the gas cylinder parameters used in the maximum weight judgment path and the gas cylinder filling target weight parameters. The gas cylinder filling target weight refers to the target weight of the gas to be filled into the gas cylinder of this specification. First, the current total weight is compared with the sum of the gas cylinder's own weight, the weight of the gas cylinder's accessories, and the maximum filling weight of the gas cylinder. When the current total weight is less than the sum of the gas cylinder's own weight, the weight of the gas cylinder's accessories, and the maximum filling weight of the gas cylinder, it means that the gas cylinder can continue to be filled. Then the current total weight is compared with the sum of the gas cylinder's own weight, the weight of the gas cylinder's accessories, and the gas cylinder's filling target weight. The sum of the gas cylinder's own weight, the weight of the gas cylinder's accessories, and the gas cylinder's filling target weight represents the gas cylinder's target weight set by the gas cylinder in the workshop. Therefore, the above comparison is a comparison between the current total weight and the gas cylinder's target weight. When the current total weight is greater than or equal to the gas cylinder's target weight, the filling valve V1 is closed and the filling end process is executed to complete the filling of the gas cylinder. The purpose of the target filling weight judgment path is to ensure that the gas cylinder is filled to the preset target weight to avoid overfilling.

[0022] Furthermore, the weight parameters used in the weight slope increase path include 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: 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 weight of the gas cylinder filling; EL3. Calculate the average slope of weight change every two seconds, and the average slope of weight change is greater than the upper limit of weight increase slope; EL4. Count the time when the average slope of weight change is greater than the upper limit of weight increase slope to obtain duration, compare the duration with the value of ten, if the duration is less than or equal to ten, go to EL3; EL5. Manual confirmation whether to continue. If it is selected as yes, the duration will be reset to zero and transfer to EL3. If it is selected as no, the filling end process will be executed and the filling will be finally ended.

[0023] The weight slope increase path uses all the parameters of the gas cylinder of this specification and the upper limit of the weight increase slope used by the target filling weight judgment path, and when 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, and is less 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, the average slope of the weight change every two seconds is calculated, and the time when the average slope of the weight change is greater than the upper limit of the weight increase slope is timed to obtain the duration, and the duration is judged. If the duration is greater than ten, manual confirmation is performed to determine whether to continue. If yes, the duration is reset to zero and the above steps of calculating the average slope of the weight change every two seconds and judging the duration are repeated. If no, the filling end process is executed and the filling is completed; If the duration is less than ten, the average slope of the weight change every two seconds is calculated, and the duration is judged again until the duration is greater than ten, and the above manual confirmation step is performed.

[0024] This weight slope increase path prevents the filling rate from being too fast, resulting in overfilling of the gas cylinder, ensuring a smooth and safe filling process Furthermore, the weight parameters used in the filling rate detection and judgment path include the weight of the gas cylinder itself, the weight of the gas cylinder accessories, the maximum filling weight of the gas cylinder, the filling target weight of the gas cylinder, the upper limit of the weight increase slope, the lower limit of the weight increase slope, and the delay calculation slope time. The specific steps are: 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 weight of the gas cylinder filling; EV3. Calculate the average slope of weight change every two seconds, and the average slope of weight change is less than or equal to the upper limit of weight increase slope; EV4. Compare the average slope of weight change with the lower limit of weight increase slope. If the average slope of weight change is greater than the lower limit of weight increase slope, go to S2. EV5. Compare the current timing value of the filling timer with the delay calculation slope time. If the current timing value of the filling timer is less than the delay calculation slope time, go to S2; EV6. Manual confirmation whether to continue. If the manual selection is yes, the current timing value of the filling timer is reset to zero and the process goes to S2. If the manual selection is no, the filling end process is executed and the filling is finally ended.

[0025] The filling rate detection judgment path uses all the parameters of the weight slope increase path, as well as the weight increase slope lower limit and the delay calculation slope time. When the current total weight satisfies the following conditions: less than the sum of the gas cylinder's own weight, the gas cylinder's accessory weight, and the gas cylinder's maximum filling weight, and the current total weight is less than the sum of the gas cylinder's own weight, the gas cylinder's accessory weight, and the gas cylinder's filling target weight, the average slope of weight change is less than or equal to the weight increase slope upper limit, and the average slope of weight change is less than the weight increase slope lower limit, 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, thus entering the manual confirmation step. The purpose of the filling rate detection judgment path is to ensure that the filling rate is within a reasonable range and to avoid the filling process being too slow or stagnant.

[0026] To summarize, the gas cylinder weight monitoring judgment utilizes the current total weight, duration, average slope of weight change in two seconds, and the current timing value of the filling timer to compare and judge with the gas cylinder parameters preset for this specification. The reasonableness of the filling speed and the safety of the filling are ensured from the weight of the gas cylinder and the rate of increase of the gas cylinder weight.

[0027] Furthermore, the pressure parameters used for monitoring and judging the gas pressure in the gas cylinder are the filling high interlocking pressure, the maximum pressure of pressure relief, and the target high pressure of pressure relief. The specific steps for monitoring and judging the gas pressure in the gas cylinder are: Ep1. Compare 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; Ep101. Close the filling valve V1, open the emptying valve V2, and automatically empty the gas cylinder; Ep102. If the current pressure of the pressure transmitter is greater than or equal to the maximum pressure of pressure relief, 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 of pressure relief, then go to S2, otherwise go to Ep3; Ep3. Close the filling valve V1; Ep4. Initialize the number of emptying times to zero; Ep5. Open the venting valve V2 and increase the venting times by 1; Ep6. If the current pressure of the transmitter is lower than the target high pressure of pressure relief, close the vent valve V2 and turn to S2, otherwise turn to Ep7; Ep7. If the number of emptying is greater than or equal to 3, go to Ep5, otherwise go to Ep8; Ep8. The yellow light flashes to give an alarm and the vent valve V2 is closed; Ep9. Manual confirmation whether to continue. If yes, go to Ep4. If no, execute the filling end process and finally end the filling.

[0028] When filling the gas cylinder with liquid gas, part of the liquid gas in the gas cylinder will be vaporized into gas due to the external environment temperature, which will cause the gas pressure in the gas cylinder to change. If the gas pressure in the gas cylinder is too high, it may even cause safety hazards. Therefore, it is necessary to monitor the gas pressure in the gas cylinder, and the monitoring of the gas pressure in the gas cylinder and the above-mentioned gas cylinder weight monitoring should be carried out simultaneously. The monitoring and judgment of the gas pressure in the gas cylinder utilizes the filling high interlocking pressure, the maximum pressure of pressure relief, and the target high pressure of pressure relief to monitor the gas pressure in the gas cylinder with the current pressure of the pressure transmitter. The filling high interlocking pressure refers to the maximum pressure limit value in the gas cylinder preset in the electronic scale weighing controller. The maximum pressure relief pressure refers to the critical value at which the gas in the gas cylinder needs to be discharged when the pressure reaches a certain value. The target high pressure of pressure relief refers to the minimum value of the gas pressure generated in the gas cylinder when the liquid gas is vaporized into gaseous state. The value of the filling high interlocking pressure is greater than the value of the maximum pressure relief pressure and the value of the target high pressure of pressure relief, and the maximum pressure relief pressure is greater than the target high pressure of pressure relief. The gas pressure in the gas cylinder is monitored and judged by the path. First, the pressure transmitter is used to compare the filling high interlocking pressure numerically, and the filled gas cylinders are divided into two categories. One category is that the gas pressure inside the gas cylinder is already greater than the filling high interlocking pressure, then this type of gas cylinder needs to be depressurized, so the filling valve V1 is closed to stop filling, and the emptying valve V2 is opened to release the gas to release the pressure. After that, the current pressure of the pressure transmitter of this type of gas cylinder is compared with the maximum pressure of pressure relief. If the current pressure of the pressure transmitter of this type of gas cylinder is less than the maximum pressure of pressure relief, the filling valve V1 is continued to be closed to stop filling, and the emptying valve V2 is opened to release the gas to release the pressure until it is less than the maximum pressure of pressure relief. When the current pressure of the pressure transmitter of this type of gas cylinder is less than the maximum pressure of pressure relief, this type of gas cylinder becomes a refillable gas cylinder. The other type is that the gas pressure inside the gas cylinder is less than the filling high interlocking pressure and the current pressure of the pressure transmitter of another type of gas cylinder is greater than the maximum pressure of pressure relief, then the other type of gas cylinder is a depressurized gas cylinder. The filling of the above two types of gas cylinders is stopped, and the generated venting times are equal to zero. The venting valve V2 is opened for venting, and the venting times are increased by 1. Then the current pressure of the pressure transmitter is compared with the pressure relief target high pressure. If the current pressure of the pressure transmitter is less than the pressure relief target high pressure, it means that the gas cylinder does not need to be depressurized. It may be that the gas cylinder is insufficiently filled. Then the venting valve V2 is closed to stop venting and go to the above S2 step. If the current pressure of the pressure transmitter is greater than or equal to the pressure relief target high pressure, it means that the gas cylinder needs to be depressurized. Then the venting times of the gas cylinder that needs to be depressurized are compared with the value 3. If the venting times of the gas cylinder are less than or equal to 3, continue to vent and increase the venting times by 1. The current pressure of the pressure transmitter is compared with the pressure relief target high pressure and the venting times are compared with the value 3 again, until the venting times are greater than 3, close the venting valve V2 to stop venting, and then manually confirm whether to continue. If yes, jump to another step where the venting times are equal to zero, and then execute the above steps from the step jumped to in sequence. If no, execute the filling end process and end the filling.

[0029] Furthermore, The process includes preparation for filling, depressurization of the gas cylinder before filling, replacement of the gas cylinder before filling, and vacuumization of the gas cylinder before filling.

[0030] The purpose of depressurizing the gas cylinder before filling is to discharge the gaseous gas in the gas cylinder to avoid the target gas being contaminated by the mixture of different gases when filling the gas cylinder. At the same time, depressurizing the gas cylinder before filling also makes the pressure transmitter more accurate when monitoring the pressure in the gas cylinder. The current pressure of the pressure transmitter is used as the basic data for monitoring and judging the pressure in the entire gas cylinder. Therefore, the accuracy and authenticity of the gas pressure monitoring in the gas cylinder are highly credible. The purpose of evacuating the gas cylinders before filling is to keep the gas pressure in each cylinder at the same state during filling. When the gas cylinders are being filled, there is a possibility that other gases remaining in the cylinders and the filled gas will mix in a certain proportion, which may lead to the possibility of explosion. Therefore, evacuating the gas cylinders into a vacuum state avoids such situations and ensures safety during the filling process.

[0031] The replacement of gas cylinders before filling is mainly to ensure that the gas cylinders are in a safe state before filling through these pre-treatment operations, so as to avoid safety hazards during the filling process due to residual gas or pressure in the gas cylinders.

[0032] Furthermore, The filling preparation includes three filling modes, which are: PDA code scanning, local filling, and local code scanning.

[0033] Different filling modes are used to adapt to different operating requirements and improve the flexibility and efficiency of the filling process. Each mode has its own specific operating procedures to ensure the accuracy and safety of the filling process.

[0034] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A filling control method of an electronic scale weighing controller for filling liquefied gas, characterized in that: The electronic scale weighing controller presets weight parameters and pressure parameters of gas cylinders of different models. The filling control method includes the following steps: S1. Start the electronic weighing controller, select the specifications of the gas cylinder to be filled to obtain the weight parameters and pressure parameters of the gas cylinder to be filled, the electronic weighing controller controls the vent valve V2, the vacuum valve V3 to open, close the filling valve V1, and pre-treat the gas cylinder to be filled before filling; 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; S3. Compare the current timing value of the filling timer with the maximum timing value specified by 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; S4. The indicator light flashes to remind you to manually confirm whether to continue filling. If yes, go to S2 and reset the current value of the filling timer to zero. If no, close the filling valve V1 and execute the filling end process to end the filling. 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. The current total weight and weight parameters obtained are used to monitor the current total weight and the filling rate of the gas cylinder. At the same time, the current pressure and pressure parameters of the pressure transmitter in the cylinder are used to monitor and judge the air pressure generated by the vaporization of liquefied gas in the gas cylinder due to the external temperature. At the same time, weight and pressure monitoring are performed to ensure the filling of the gas cylinder.

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

3. The filling control method of the electronic scale weighing controller for liquefied gas filling according to claim 2 is characterized in that: The weight parameters used in the maximum weight judgment path include 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: 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 will flash to alarm; E MAX2 .Close the filling valve V1 and open the drain 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 weight of the gas cylinder filling, 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 the 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 include 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 weight of the gas cylinder filling; EM3. After closing the filling valve V1, the filling end process is executed to finally end the filling.

5. 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 weight slope increase path include 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: 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 weight of the gas cylinder filling; EL3. Calculate the average slope of weight change every two seconds, and the average slope of weight change is greater than the upper limit of weight increase slope; EL4. Count the time when the average slope of weight change is greater than the upper limit of weight increase slope to obtain duration, compare the duration with the value of ten, if the duration is less than or equal to ten, go to EL3; EL5. Manual confirmation whether to continue. If it is selected as yes, the duration will be reset to zero and transfer to EL3. If it is selected as no, the filling end process will be executed and the filling will be finally ended.

6. 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 filling rate detection and judgment path include the weight of the gas cylinder itself, the weight of the gas cylinder accessories, the maximum filling weight of the gas cylinder, the filling target weight of the gas cylinder, the upper limit of the weight increase slope, the lower limit of the weight increase slope, and the delay calculation slope time. The specific steps are: 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 weight of the gas cylinder filling; EV3. Calculate the average slope of weight change every two seconds, and the average slope of weight change is less than or equal to the upper limit of weight increase slope; EV4. Compare the average slope of weight change with the lower limit of weight increase slope. If the average slope of weight change is greater than the lower limit of weight increase slope, go to S2. EV5. Compare the current timing value of the filling timer with the delay calculation slope time. If the current timing value of the filling timer is less than the delay calculation slope time, go to S2; EV6. Manual confirmation whether to continue. If the manual selection is yes, the current timing value of the filling timer is reset to zero and the process goes to S2. If the manual selection is no, the filling end process is executed and the filling is finally ended.

7. The filling control method of the electronic scale weighing controller for liquefied gas filling according to claim 1, characterized in that: The pressure parameters used for monitoring and judging the gas pressure in the gas cylinder are the filling high interlocking pressure, the maximum pressure of pressure relief, and the target high pressure of pressure relief. The specific steps for monitoring and judging the gas pressure in the gas cylinder are: Ep1. Compare 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; Ep101. Close the filling valve V1, open the emptying valve V2, and automatically empty the gas cylinder; Ep102. If the current pressure of the pressure transmitter is greater than or equal to the maximum pressure of pressure relief, 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 of pressure relief, then go to S2, otherwise go to Ep3; Ep3. Close the filling valve V1; Ep4. Initialize the number of emptying times to zero; Ep5. Open the venting valve V2 and increase the venting times by 1; Ep6. If the current pressure of the transmitter is lower than the target high pressure of pressure relief, close the vent valve V2 and turn to S2, otherwise turn to Ep7; Ep7. If the number of emptying is greater than or equal to 3, go to Ep5, otherwise go to Ep8; Ep8. The yellow light flashes to give an alarm and the vent valve V2 is closed; Ep9. Manual confirmation whether to continue. If yes, go to Ep4. If no, execute the filling end process and finally end the filling.

8. The filling control method of the 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 the 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 code scanning, local filling, and local code scanning.

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