A filling control method and a hose filling system

Abstract

The application discloses a filling control method and a hose filling system, and the method comprises the following steps: S1, a distributor is connected with a buffer tank through a pipeline, and pressure data in the pipeline is transmitted to a PLC controller through a pressure sensor arranged at the front end of the distributor; S2, the PLC controller calculates a filling stroke value through a preset filling stroke calculation formula; S3, the PLC controller transmits the calculated filling stroke information to a driver, the driver drives a roller to lift to extrude a hose, and filling is performed; and S4, after filling is completed, the fluid obtained through filling is weighed, the weighing result is fed back to the PLC controller, the actual filling amount is compared with a preset target filling amount, and single filling stroke calibration is performed according to the comparison result, so that closed-loop control is formed. The application has the advantages of simple operation, stable filling amount, high filling precision and the like, solves the problem that the filling amount is unstable due to pressure fluctuation at the front end of the hose, and realizes high-precision filling.

Description

Technical Field

[0001] This invention belongs to the field of hose pump technology, specifically relating to a filling control method and a hose filling system. Background Technology

[0002] Existing flexible hose pumps use a flexible hose as the pump tubing during filling. When using a flexible hose pump for filling, the volume is calculated by multiplying the cross-sectional area S of the hose by its length (i.e., the filling stroke L). If the pressure at the front end increases, the hose expands, increasing its cross-sectional area. Since the filling stroke remains constant, the final filling volume also increases. Conversely, if the pressure at the front end decreases, the cross-sectional area of ​​the hose decreases, and since the filling stroke remains constant, the final filling volume decreases. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art in which the filling volume is unstable due to pressure fluctuation at the front end of the hose, and to provide a filling control method and hose filling system that is compact in structure, simple to operate, stable in filling volume and high in filling accuracy.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A filling control method includes the following steps:

[0006] Step S1: Connect the dispenser and the buffer tank through a pipeline, and transmit the pressure data in the pipeline to the PLC controller through a pressure sensor set at the front end of the dispenser.

[0007] Step S2: The PLC controller receives the feedback pressure data and automatically calculates the filling stroke value using the preset filling stroke calculation formula;

[0008] Step S3: The PLC controller transmits the calculated filling stroke information to the driver of the filling system. The driver drives the rollers to rise and fall to squeeze the tubing and perform filling.

[0009] Step S4: After filling is completed, the filled fluid is weighed and the weighing result is fed back to the PLC controller. The PLC controller compares the actual filling volume with the preset target filling volume and performs single filling stroke calibration based on the comparison result to form closed-loop control.

[0010] As a further improvement of the present invention, in step S2, the initial filling stroke value is set to L0. Where V0 is the initial preset filling volume, and S0 is the cross-sectional area of ​​the tubing when the pressure detection at the front end of the dispenser is P0.

[0011] As a further improvement of the present invention, in step S2, when the pressure at the front end of the distributor is detected as P1, the cross-sectional area of ​​the hose is... in, Indicates the coefficient of expansion of the hose. It is a constant.

[0012] As a further improvement of the present invention, in step S2, when the pressure detection at the front end of the dispenser changes to P1, the filling stroke value...

[0013] As a general technical concept, the present invention also provides a tube filling system for implementing the above-described filling control method, comprising: a buffer tank, a PLC controller, a pressure sensor, a dispenser, a tube assembly, a roller tube pressing assembly, and a medicine bottle; the buffer tank is connected to a dispensing system, the input end of the dispenser is connected to the buffer tank via a stainless steel pipe, the output end of the dispenser is connected to the input end of the tube assembly, the output end of the tube assembly is connected to the medicine bottle, a pressure sensor is provided on the stainless steel pipe, the pressure sensor is connected to the PLC controller via a signal line, and the PLC controller is also connected to the roller tube pressing assembly; the pressure sensor is used to transmit the pressure value at the front end of the dispenser to the PLC controller, and the PLC controller automatically adjusts the stroke of the roller tube pressing assembly based on the pressure data fed back by the pressure sensor, thereby controlling the filling volume of the tube assembly.

[0014] As a further improvement of the present invention, the tubing assembly includes: an inlet tube, a connector, an elastic tubing, an outlet tube, and a filling needle; the inlet tube is connected to the output end of the dispenser, the output end of the inlet tube is connected to the input end of the elastic tubing via the connector, the output end of the elastic tubing is connected to the input end of the outlet tube via the connector, and the output end of the outlet tube is connected to the filling needle, so that the liquid medicine is delivered into the medicine bottle through the filling needle.

[0015] As a further improvement of the present invention, the medicine bottle is mounted on a weighing device. After filling is completed, the weighing device feeds back the weight of the filled medicine to the PLC controller.

[0016] As a further improvement of the present invention, the roller pressing assembly includes a driver and a roller. The roller is disposed on both sides of the elastic hose. The driver is connected to a PLC controller. The PLC controller sends the calculated filling stroke information to the driver, thereby controlling the pressing stroke of the roller on the outside of the elastic hose.

[0017] As a further improvement of the present invention, the driver is a servo motor.

[0018] As a further improvement of the present invention, a breather valve is provided on the top of the buffer tank.

[0019] Compared with the prior art, the advantages of the present invention are as follows:

[0020] 1. The filling control method of the present invention firstly uses a pressure sensor installed at the front end of the distributor to transmit the pressure data in the pipeline to the PLC controller. After receiving the feedback pressure data, the PLC controller automatically calculates the filling stroke value under the corresponding pressure condition through a preset filling stroke calculation formula. The PLC controller transmits the calculated filling stroke information to the driver of the filling system. The driver drives the roller to rise and fall to squeeze the hose for filling. After filling is completed, the filled fluid is weighed and the weighing result is fed back to the PLC controller. The PLC controller compares the actual filling volume with the preset target filling volume and performs single filling stroke calibration based on the comparison result, thus forming a closed-loop control. By detecting pressure changes, the filling stroke is adjusted. The filling stroke is different under different pressure conditions, avoiding fluctuations in filling volume caused by changes in the cross-sectional area of ​​the hose due to pressure changes at the front end of the hose, and realizing high-precision filling metering control.

[0021] 2. The tubing filling system of the present invention connects the input end of the dispenser to the buffer tank via a stainless steel pipe, connects the output end of the dispenser to the input end of the tubing assembly, and connects the output end of the tubing assembly to the medicine bottle, thus forming the main structure of the filling system. Furthermore, a pressure sensor is installed on the stainless steel pipe, connected to a PLC controller, which in turn is connected to the roller pressing assembly. The pressure sensor transmits the pressure data from the dispenser's front end to the PLC controller. The PLC controller performs corresponding calculations based on the pressure data from the pressure sensor and automatically adjusts the stroke of the roller pressing assembly, thereby controlling the filling volume of the tubing assembly. This effectively avoids fluctuations in the filling volume caused by pressure fluctuations at the tubing's front end, simultaneously meeting the requirements for both small and large filling volumes while ensuring high precision. Attached Figure Description

[0022] Figure 1 This is a logic diagram of filling control in a specific embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram illustrating the structural principle of the hose filling system in a specific embodiment of the present invention.

[0024] Legend: 1. Buffer tank; 2. PLC controller; 3. Pressure sensor; 4. Signal line; 5. Stainless steel pipe; 6. Dispenser; 61. Dispenser outlet; 7. Inlet pipe; 8. Pipe connector; 9. Roller; 10. Flexible hose; 11. Outlet pipe; 12. Filling needle; 13. Medicine bottle; 14. Breathing valve. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0026] Example 1

[0027] like Figure 1 As shown, the filling control method of the present invention includes the following steps:

[0028] Step S1: Connect the dispenser and the buffer tank through a pipeline, and transmit the pressure data in the pipeline to the PLC controller through a pressure sensor set at the front end of the dispenser.

[0029] Step S2: The PLC controller receives the feedback pressure data and automatically calculates the filling stroke value using a preset filling stroke calculation formula.

[0030] Step S3: The PLC controller transmits the calculated filling stroke information to the driver of the filling system. The driver drives the rollers to rise and fall to squeeze the tubing and perform filling.

[0031] Step S4: After filling is completed, the filled fluid is weighed and the weighing result is fed back to the PLC controller. The PLC controller compares the actual filling volume with the preset target filling volume and performs single filling stroke calibration based on the comparison result to form closed-loop control.

[0032] In step S2, the initial filling stroke value is set to L0. Where V0 is the initial preset filling volume, and S0 is the cross-sectional area of ​​the tubing when the pressure detection at the front end of the dispenser is P0.

[0033] For the same device, if only the pressure changes while other parameters remain constant, theoretically, the change in the cross-sectional area of ​​the hose follows Hooke's Law. When the pressure at the distributor tip is P1, the cross-sectional area of ​​the hose is... in, Indicates the coefficient of expansion of the hose. It is a constant.

[0034] Correspondingly, when the pressure detection at the front end of the dispenser changes to P1, the filling stroke value... This formula shows that, for a given filling volume, the filling stroke and pressure are inversely proportional. When the pressure sensor transmits the pressure value to the PLC controller, the PLC controller receives the feedback data and automatically calculates the filling stroke according to the filling stroke calculation formula. It then transmits the newly derived stroke information to the roller driver of the filling system for a new round of filling control.

[0035] In this embodiment, a pressure sensor installed at the front end of the dispenser first transmits the pressure data in the pipeline to the PLC controller. After receiving the feedback pressure data, the PLC controller automatically calculates the filling stroke value under the corresponding pressure condition using a preset filling stroke calculation formula. The PLC controller transmits the calculated filling stroke information to the driver of the filling system, which drives the rollers to rise and fall to squeeze the hose for filling. After filling is completed, the filled fluid is weighed, and the weighing result is fed back to the PLC controller. The PLC controller compares the actual filling volume with the preset target filling volume and performs single-cycle filling stroke calibration based on the comparison result, thus forming a closed-loop control. By detecting pressure changes, the filling stroke is adjusted. The filling stroke is different under different pressure conditions, avoiding fluctuations in filling volume caused by changes in the cross-sectional area of ​​the hose due to pressure changes at the front end of the hose, and achieving high-precision filling metering control.

[0036] Example 2

[0037] like Figure 2 As shown, the tubing filling system of the present invention uses the filling control method in Embodiment 1 for filling control, including: a buffer tank 1, a PLC controller 2, a pressure sensor 3, a dispenser 6, a tubing assembly, a roller pressing assembly, and a medicine bottle 13. The buffer tank 1 is connected to the dispensing system. The input end of the dispenser 6 is connected to the buffer tank 1 through a stainless steel pipe 5. The output end of the dispenser 6 is connected to the input end of the tubing assembly, and the output end of the tubing assembly is connected to the medicine bottle 13. A pressure sensor 3 is installed on the stainless steel pipe 5. The pressure sensor 3 is connected to the PLC controller 2 through a signal line 4. The PLC controller 2 is also connected to the roller pressing assembly. The pressure sensor 3 is used to transmit the pressure value at the front end of the dispenser 6 to the PLC controller 2. The PLC controller 2 automatically adjusts the stroke of the roller pressing assembly according to the pressure data fed back by the pressure sensor 3, thereby controlling the filling volume of the tubing assembly.

[0038] In this embodiment, the tubing assembly includes: an inlet pipe 7, a connector 8, an elastic tubing 10, an outlet pipe 11, and a filling needle 12. The inlet pipe 7 is connected to the distributor outlet 61 of the distributor 6, the outlet pipe 7 is connected to the inlet pipe 10 via the connector 8, the outlet pipe 10 is connected to the inlet pipe 11 via the connector 8, and the outlet pipe 11 is connected to the filling needle 12. The medicine is delivered to the medicine bottle 13 through the filling needle 12.

[0039] In this embodiment, the medicine bottle 13 is placed on the weighing device. After filling is completed, the weighing device feeds back the weight of the filled medicine to the PLC controller 2. The PLC controller 2 compares the actual filling amount with the preset target filling amount, and calibrates the single filling stroke according to the comparison result to achieve complete closed-loop control of the stroke.

[0040] In this embodiment, the roller pressing assembly includes a driver and rollers 9. The rollers 9 are disposed on both sides of the elastic hose 10. The driver is connected to a PLC controller 2. The PLC controller 2 sends the calculated filling stroke information to the driver, thereby controlling the pressing stroke of the rollers 9 on the outside of the elastic hose 10. Specifically, the driver is a servo motor.

[0041] like Figure 2 As shown, in this embodiment, a breather valve 14 is provided on the top of the buffer tank 1 to facilitate real-time adjustment of the pressure inside the buffer tank 1 and improve the smoothness of filling.

[0042] In this embodiment, the input end of the dispenser 6 is connected to the buffer tank 1 via a stainless steel pipe 5, the output end of the dispenser 6 is connected to the input end of the hose assembly, and the output end of the hose assembly is connected to the medicine bottle 13, thus forming the main structure of the filling system. Furthermore, a pressure sensor 3 is installed on the stainless steel pipe 5, and the pressure sensor 3 is connected to the PLC controller 2. The PLC controller 2 is also connected to the roller tube pressing assembly. The pressure sensor 3 transmits the pressure data from the front end of the dispenser 6 to the PLC controller 2. The PLC controller 2 performs corresponding calculations based on the pressure data fed back by the pressure sensor 3 and automatically adjusts the stroke of the roller tube pressing assembly, thereby controlling the filling volume of the hose assembly. This effectively avoids fluctuations in the filling volume caused by pressure fluctuations at the front end of the hose, simultaneously meeting the equipment requirements for both small and large filling volumes, and ensuring high precision.

[0043] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the spirit and technical essence of the invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the scope of protection of the present invention.

Claims

1. A filling control method characterized by, Includes the following steps: Step S1: Connect the dispenser and the buffer tank through a pipeline, and transmit the pressure data in the pipeline to the PLC controller through a pressure sensor set at the front end of the dispenser. Step S2: The PLC controller receives the feedback pressure data and automatically calculates the filling stroke value using the preset filling stroke calculation formula; Step S3: The PLC controller transmits the calculated filling stroke value to the driver of the filling system. The driver drives the rollers to rise and fall to squeeze the tube and perform filling. Step S4: After filling is completed, the fluid obtained from filling is weighed and the weighing result is fed back to the PLC controller. The PLC controller compares the actual filling amount with the preset target filling amount and performs single filling stroke calibration based on the comparison result to form closed-loop control. In the step S2, the filling initial stroke value is set as , wherein, is the initial preset filling amount, is the cross-sectional area of the hose when the front end pressure of the distributor is detected as . In the step S2, when the pressure before the liquid separator is detected as , the cross-sectional area of the hose is , where represents the expansion coefficient of the hose, is a constant. When the pressure at the front end of the distributor becomes the filling stroke value .

2. A hose filling system for carrying out the filling control method of claim 1, characterized in that include: The system comprises a buffer tank (1), a PLC controller (2), a pressure sensor (3), a dispenser (6), a hose assembly, a roller tube assembly, and a medicine bottle (13). The buffer tank (1) is connected to the dispensing system. The input end of the dispenser (6) is connected to the buffer tank (1) via a stainless steel pipe (5). The output end of the dispenser (6) is connected to the input end of the hose assembly. The output end of the hose assembly is connected to the medicine bottle (13). The stainless steel pipe (5) is equipped with a pressure sensor (3). The pressure sensor (3) is connected to the PLC controller (2) via a signal line (4). The PLC controller (2) is also connected to the roller tube assembly. The pressure sensor (3) is used to transmit the pressure value at the front end of the dispenser (6) to the PLC controller (2). The PLC controller (2) automatically adjusts the stroke of the roller tube assembly based on the pressure data fed back by the pressure sensor (3), thereby controlling the filling volume of the hose assembly.

3. The hose filling system of claim 2, wherein, The hose assembly includes: an inlet pipe (7), a pipe connector (8), an elastic hose (10), an outlet pipe (11), and a filling needle (12); the inlet pipe (7) is connected to the output end of the dispenser (6), the output end of the inlet pipe (7) is connected to the input end of the elastic hose (10) through the pipe connector (8), the output end of the elastic hose (10) is connected to the input end of the outlet pipe (11) through the pipe connector (8), the output end of the outlet pipe (11) is connected to the filling needle (12), and the medicine is delivered to the medicine bottle (13) through the filling needle (12).

4. The hose filling system of claim 3, wherein, The medicine bottle (13) is placed on the weighing device. After filling is completed, the weighing device feeds back the filling weight of the medicine liquid to the PLC controller (2).

5. The hose filling system of claim 3, wherein, The roller pressing assembly includes a driver and a roller (9). The roller (9) is disposed on both sides of the elastic hose (10). The driver is connected to a PLC controller (2). The PLC controller (2) sends the calculated filling stroke information to the driver, thereby controlling the pressing stroke of the roller (9) on the outside of the elastic hose (10).

6. The hose filling system of claim 5, wherein, The driver uses a servo motor.

7. A hose filling system according to any one of claims 2 to 6, characterised in that, The buffer tank (1) is equipped with a breathing valve (14) on its top.

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