Quantitative filling device for edible beverage

Abstract

The utility model relates to a quantitative filling device for edible drinks, which belongs to the technical field of liquid filling and comprises a liquid storage tank, a filling head, a first piston cylinder, a second piston cylinder and a three-way valve, liquid in the liquid storage tank is sucked by negative pressure through the first piston cylinder, and the sucked liquid is discharged by positive pressure; liquid in the liquid storage tank is sucked through negative pressure of the second piston cylinder, according to flow data detected by the flow sensor, the controller controls the second piston cylinder to discharge the sucked liquid through positive pressure so as to make up for the liquid discharge amount error of the first piston cylinder, and the problems that according to an existing filling device, starting and stopping of liquid filling are achieved through opening and closing of a valve; however, the liquid is naturally discharged through the dead weight and is easily influenced by the viscosity and temperature of the liquid, so that quantitative errors exist.

Description

Technical Field

[0001] This utility model belongs to the field of liquid filling technology, specifically relating to a quantitative filling device for edible beverages. Background Technology

[0002] Liquid filling machines are machines used to fill liquid products. In the filling process of liquid beverages, filling machines with quantitative output function are required to ensure that the liquid volume of the product is constant.

[0003] For example, patent authorization announcement number CN112810858B discloses a quantitative filling device for beverage processing, relating to the field of liquid filling technology. Addressing the problem that existing flow meters used in beverage quantitative filling processes are easily affected by various factors, leading to measurement errors, affecting the accuracy of quantitative filling, and increasing production costs, the following solution is proposed: It includes a filling platform, a storage tank, a measuring cylinder, and a filling head. The filling platform is internally divided into a storage chamber and a filling chamber. The storage chamber contains a storage tank and a measuring cylinder. A flow control mechanism is provided between the storage tank and the measuring cylinder. A capacity adjustment mechanism is provided on the top of the measuring cylinder. A downcomer and a filling head are connected to the bottom of the measuring cylinder.

[0004] Based on the search of the aforementioned patent grant announcement numbers, and considering their shortcomings, the following was found:

[0005] Existing filling devices start and stop liquid filling by opening and closing valves, but the liquid is discharged naturally by its own weight, which is easily affected by the viscosity and temperature of the liquid, resulting in quantitative errors. Utility Model Content

[0006] To address the problem that existing filling devices start and stop liquid filling by opening and closing valves, but the liquid is discharged naturally by its own weight, which is easily affected by the viscosity and temperature of the liquid, resulting in quantitative errors, this utility model provides a quantitative filling device for edible beverages.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A quantitative filling device for edible beverages includes a storage tank, a filling head, a first piston cylinder, a second piston cylinder, and a three-way valve. The inlet of the first piston cylinder is connected to the storage tank, and the outlet of the first piston cylinder is connected to the first valve port of the three-way valve. The inlet of the second piston cylinder is connected to the storage tank, and the outlet of the second piston cylinder is connected to the second valve port of the three-way valve. The filling head is connected to the third valve port of the three-way valve, which is an output end used to switch the connection between the first piston cylinder or the second piston cylinder and the filling head.

[0009] The quantitative filling device also includes a controller and a flow sensor connected to the controller. The flow sensor is used to detect the flow data of the filling head. The controller dynamically adjusts the discharge stroke length of the second piston cylinder according to the detection data of the flow sensor to achieve quantitative filling.

[0010] As a preferred embodiment of this utility model, the first piston cylinder includes a first cylinder body, a first piston, a first transmission rod, and a first power device. The first cylinder body has a first cavity. The first piston is disposed in the first cavity, and the outer diameter of the first piston is the same as the inner diameter of the first cavity. The first transmission rod passes through the upper end of the first cylinder body, with one end inside the first cylinder body connected to the first piston, and the other end outside the first cylinder body connected to the first power device. The first power device is signal-connected to the controller and is used to drive the first transmission rod to cause the first piston to perform linear reciprocating motion in the first cavity. The inlet and outlet of the first piston cylinder are both located at the extreme stroke points of the first piston away from the direction of the first transmission rod.

[0011] As a preferred embodiment of this utility model, the first power device includes a stepper motor, a coupling, a transmission screw, and a transmission nut. The transmission screw is connected to the drive end of the stepper motor via the coupling. The transmission nut is threadedly connected to the transmission screw and fixedly connected to the first transmission rod.

[0012] In a preferred embodiment of this invention, the stepper motor is connected to an encoder, and the encoder is electrically connected to the controller.

[0013] As a preferred embodiment of this utility model, the second piston cylinder includes a second cylinder body, a second piston, a second transmission rod, and a second power device. The second cylinder body has a second cavity. The second piston is disposed in the second cavity, and the outer diameter of the second piston is the same as the inner diameter of the second cavity. The second transmission rod passes through the upper end of the second cylinder body, with one end inside the second cylinder body connected to the second piston, and the other end outside the second cylinder body connected to the second power device. The second power device is signal-connected to the controller and is used to drive the second transmission rod to cause the second piston to perform linear reciprocating motion in the second cavity. The inlet and outlet of the second piston cylinder are both located at the limit stroke of the second piston away from the direction of the second transmission rod. The cross-sectional area of ​​the first cavity is larger than the cross-sectional area of ​​the second cavity.

[0014] As a preferred embodiment of this utility model, the second power device includes an electric push rod, the drive end of which is connected to the second transmission rod.

[0015] As a preferred embodiment of this utility model, a first one-way solenoid valve is provided in the liquid passage between the inlet of the first piston cylinder and the liquid storage tank; a second one-way solenoid valve is provided in the liquid passage between the outlet of the first piston cylinder and the first valve port; a third one-way solenoid valve is provided in the liquid passage between the inlet of the second piston cylinder and the liquid storage tank; and a fourth one-way solenoid valve is provided in the liquid passage between the outlet of the second piston cylinder and the second valve port. The first, second, third, and fourth one-way solenoid valves are all electrically connected to the controller.

[0016] As a preferred embodiment of this utility model, the flow sensor is disposed in the liquid passage between the outlet of the first piston cylinder and the filling head. The flow sensor includes a stator housing, a magnetic rotor, and a Hall switch. The Hall switch is fixed to the stator housing. The stator housing is provided with a measuring chamber and an inlet and an outlet connected to the measuring chamber. The magnetic rotor is rotatably disposed in the measuring chamber. The Hall switch is electrically connected to the controller. Liquid entering the measuring chamber from the inlet flows out from the outlet after driving the magnetic rotor to rotate.

[0017] As a preferred embodiment of this invention, the controller is a programmable logic controller.

[0018] As a preferred technical solution of this utility model, the inner wall of the flow channel of the filling head is coated with polytetrafluoroethylene.

[0019] The beneficial effects of this utility model are as follows:

[0020] This solution uses a first piston cylinder to draw liquid from the storage tank using negative pressure and then uses positive pressure to discharge the drawn liquid. A second piston cylinder also draws liquid from the storage tank using negative pressure. Based on flow data detected by a flow sensor, the controller controls the second piston cylinder to discharge the drawn liquid using positive pressure to compensate for the discharge error of the first piston cylinder. This solves the problem of existing filling devices that use valves to start and stop liquid filling, but where the liquid is discharged naturally by its own weight, making it susceptible to variations in viscosity and temperature, leading to quantitative errors. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of a quantitative filling device for edible beverages according to the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of a quantitative filling device for edible beverages according to the present invention.

[0024] Figure 3 This is a schematic diagram of the internal structure of the first piston cylinder of a quantitative filling device for edible beverages according to the present invention.

[0025] Figure 4 This is a schematic diagram of the internal structure of the second piston cylinder of a quantitative filling device for edible beverages according to this utility model.

[0026] Figure 5 This is a schematic diagram of the three-way valve and filling head working together in a quantitative filling device for edible beverages according to this utility model.

[0027] Explanation of main symbols

[0028] In the diagram: 1. Liquid storage tank; 2. First piston cylinder; 21. First power unit; 211. Stepper motor; 212. Coupling; 213. Transmission screw; 214. Transmission nut; 22. First cylinder body; 23. First piston; 24. First transmission rod; 3. Second piston cylinder; 31. Second power unit; 32. Second cylinder body; 33. Second piston; 34. Second transmission rod; 4. Three-way valve; 5. Filling head; 6. Flow sensor. Detailed Implementation

[0029] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0030] Please see Figure 1-5This embodiment provides a quantitative filling device for edible beverages, including a storage tank 1, a filling head 5, a first piston cylinder 2, a second piston cylinder 3, and a three-way valve 4. The inlet of the first piston cylinder 2 is connected to the storage tank 1, and the outlet of the first piston cylinder 2 is connected to the first valve port of the three-way valve 4. The inlet of the second piston cylinder 3 is connected to the storage tank 1, and the outlet of the second piston cylinder 3 is connected to the second valve port of the three-way valve 4. The filling head 5 is connected to the third valve port of the three-way valve 4, which is the output end and used to switch the connection between the first piston cylinder 2 or the second piston cylinder 3 and the filling head 5. The quantitative filling device also includes a controller and a flow sensor 6 connected to the controller. The flow sensor 6 is used to detect the flow data of the filling head 5. The controller dynamically adjusts the discharge stroke length of the second piston cylinder 3 according to the detection data of the flow sensor 6 to achieve quantitative filling. It can be understood that the first piston cylinder 2 is mainly used for conventional filling operations, while the second piston cylinder 3 serves as an error compensation cylinder. After the first piston cylinder 2 completes the initial filling, the flow sensor 6 detects the actual filling volume and compares it with a preset value. If a discrepancy exists, the controller instructs the second piston cylinder 3 to make fine adjustments to supplement or reduce the liquid volume, achieving precise filling. The three-way valve 4 is used to switch the connection between the first piston cylinder 2 or the second piston cylinder 3 and the filling head 5, so that while one piston cylinder is filling or preparing to fill, the other piston cylinder can simultaneously perform liquid suction or prepare for the next filling, improving filling efficiency.

[0031] In one feasible embodiment, before filling begins, both the first piston cylinder 2 and the second piston cylinder 3 are in their initial positions, and the three-way valve 4 is in the open state. After filling begins, the controller instructs the three-way valve 4 to switch the first piston cylinder 2 to the state where it is connected to the filling head 5, and simultaneously drives the first piston cylinder 2 to perform filling. During the filling process of the first piston cylinder 2, the flow sensor 6 monitors the flow data of the filling head 5 in real time and transmits the data to the controller. After the first piston cylinder 2 completes the initial filling, the controller calculates the amount of liquid that needs to be added based on the difference between the flow data and the preset value. Then, the controller instructs the three-way valve 4 to switch the second piston cylinder 3 to the state where it is connected to the filling head 5, and drives the second piston cylinder 3 to perform fine adjustments to add liquid and achieve precise filling. When the predetermined filling volume is reached, the controller instructs the three-way valve 4 to disconnect from the filling head 5, and simultaneously stops the movement of the first piston cylinder 2 and the second piston cylinder 3.

[0032] Furthermore, the first piston cylinder 2 includes a first cylinder body 22, a first piston 23, a first transmission rod 24, and a first power device 21. The first cylinder body 22 has a first cavity; the first piston 23 is disposed in the first cavity, and the outer diameter of the first piston 23 is the same as the inner diameter of the first cavity; the first transmission rod 24 passes through the upper end of the first cylinder body 22, with one end of the first transmission rod 24 connected to the first piston 23 inside the first cylinder body 22, and the other end of the first transmission rod 24 connected to the first power device 21 outside the first cylinder body 22; the first power device 21 is signal-connected to a controller and is used to drive the first transmission rod 24 to drive the first piston 23 to perform linear reciprocating motion in the first cavity; the inlet and outlet of the first piston cylinder 2 are both located at the limit stroke of the first piston 23 away from the direction of the first transmission rod 24. In this embodiment, the linear reciprocating motion of the first piston 23 within the first cylinder body 22 is used to change the volume within the first cylinder body 22, thereby realizing the intake, compression, and discharge of fluid. Understandably, in the design of the first piston cylinder 2, the outer diameter of the first piston 23 is the same as the inner diameter of the first cavity, ensuring a tight fit between the piston and the cylinder body and preventing fluid leakage. Simultaneously, by opening inlets and outlets at the piston's limit stroke, fluid can be drawn in and discharged at different positions on the piston.

[0033] In one feasible embodiment, the first piston 23 is located at its limit stroke position away from the first transmission rod 24. At this time, the inlet of the first piston cylinder 2 is open and the outlet is closed. The controller sends a signal to the first power unit 21, driving the first transmission rod 24 to move the first piston 23 towards its limit stroke position closer to the first transmission rod 24. As the first piston 23 moves, the volume inside the first cylinder 22 gradually increases, creating a negative pressure, and fluid is drawn into the first cylinder 22 through the open inlet. As the first piston 23 moves towards its limit stroke position away from the first transmission rod 24, the fluid inside the first cylinder 22 is compressed, the pressure increases, and the inlet closes to prevent fluid backflow. During the movement of the first piston 23, the volume inside the first cylinder 22 gradually decreases, the pressure continues to increase, and the fluid is discharged from the first cylinder 22 through the open outlet. By connecting with the controller, the operation of the first power unit 21 can be precisely controlled, thereby achieving precise adjustment of parameters such as the movement speed and stroke of the first piston 23 to meet various complex fluid transmission or pressure conversion needs.

[0034] Specifically, the first power unit 21 includes a stepper motor 211, a coupling 212, a transmission screw 213, and a transmission nut 214. The transmission screw 213 is connected to the drive end of the stepper motor 211 via the coupling 212. The transmission nut 214 is threadedly connected to the transmission screw 213 and fixedly connected to the first transmission rod 24. It can be understood that the transmission screw 213, as the driving component, tightly engages with the internal threads of the transmission nut 214 through its surface threads. When the stepper motor 211 drives the transmission screw 213 to rotate via the coupling 212, the transmission nut 214 will move axially due to the angle of the threads. This conversion mechanism is simple and effective, enabling a smooth transition from rotation to linear motion. Furthermore, by controlling the number of rotation steps and the direction of the stepper motor 211, the movement distance and direction of the transmission nut 214 can be precisely controlled.

[0035] In one feasible embodiment, the control system sends a command to the stepper motor 211, which begins to rotate according to a preset number of pulses. The rotation of the stepper motor 211 is directly transmitted to the transmission screw 213 via the coupling 212. Due to the interaction of the threads, the transmission nut 214 begins to move along the screw axis. The transmission nut 214 is fixedly connected to the first transmission rod 24. Therefore, the linear motion of the transmission nut 214 directly drives the first transmission rod 24 to perform the same linear movement. By accurately calculating the number of rotation steps of the stepper motor 211, the moving distance of the transmission nut 214 (and the first transmission rod 24) can be accurately controlled to achieve precise positioning. It should be explained that the transmission nut 214 needs to be limited in its rotational direction so that it can only move linearly in the axial direction of the transmission screw 213. The limiting means can be to set a fixed seat, with a first blocking part set in the radial direction of the transmission nut 214 and a corresponding second blocking part set on the fixed seat. The second blocking part limits the first blocking part so that the transmission nut 214 cannot rotate. It should be noted that the limiting means of the transmission nut 214 is existing technology and will not be described in detail here.

[0036] Specifically, the stepper motor 211 is connected to an encoder, which is electrically connected to the controller. An encoder is a device that measures and records rotational motion (or linear motion, via a conversion mechanism). The encoder mounted on the shaft of the stepper motor 211 generates a series of pulse signals as the stepper motor 211 rotates. The number and frequency of these signals are proportional to the rotation angle and speed of the stepper motor 211. By reading these pulse signals, the controller can calculate the current position and speed of the stepper motor 211 in real time, compare them with preset values, and generate necessary control commands to correct any deviations. This ensures high precision and stability of the stepper motor 211's movement. Through a closed-loop feedback mechanism, the encoder can monitor and correct the motion error of the stepper motor 211 in real time, significantly improving the system's positioning accuracy.

[0037] Furthermore, the second piston cylinder 3 includes a second cylinder body 32, a second piston 33, a second transmission rod 34, and a second power device 31. The second cylinder body 32 has a second cavity. The second piston 33 is disposed in the second cavity, and its outer diameter is the same as the inner diameter of the second cavity. The second transmission rod 34 passes through the upper end of the second cylinder body 32, with one end inside the second cylinder body 32 connected to the second piston 33, and the other end outside the second cylinder body 32 connected to the second power device 31. The second power device 31 is signal-connected to a controller and is used to drive the second transmission rod 34 to drive the second piston 33 to perform linear reciprocating motion in the second cavity. The inlet and outlet of the second piston cylinder 3 are both located at the limit stroke of the second piston 33 in the direction away from the second transmission rod 34. The cross-sectional area of ​​the first cavity is larger than that of the second cavity. Optionally, the volume of the first cavity is twenty times the volume of the second cavity; for example, the volume of the first cavity is 200 ml, and the volume of the second cavity is 10 ml.

[0038] In one feasible embodiment, the controller receives instructions from an external or internal system, including the required fluid flow rate. Based on the received instructions, the controller adjusts the output of the first power unit 21 to drive the piston of the first piston cylinder 2 in a linear reciprocating motion, thereby providing the filling head 5 with fluid at the same flow rate as required. Simultaneously, during the fluid transmission process of the first piston cylinder 2, the flow sensor 6 measures the fluid flow rate in real time and transmits the measurement signal to the controller. The controller compares the measured flow rate signal with a preset value and adjusts the output of the second power unit 31. The second piston cylinder 3 compensates for any errors in the fluid flow rate output by the first piston cylinder 2, ensuring the stability and accuracy of the fluid flow rate.

[0039] Furthermore, the second power unit 31 includes an electric actuator, the drive end of which is connected to the second transmission rod 34. It is understood that when the electric actuator is activated, it performs a linear extension and retraction motion, directly driving the second transmission rod 34 and the second piston 33 to perform linear reciprocating motion within the second cylinder 32. It is understood that the electric actuator has high control precision and response speed, enabling precise control of the second piston cylinder 3, which helps improve the stability and reliability of the system.

[0040] Furthermore, a first one-way solenoid valve is installed in the liquid passage between the inlet of the first piston cylinder 2 and the liquid storage tank 1; a second one-way solenoid valve is installed in the liquid passage between the outlet of the first piston cylinder 2 and the first valve port; a third one-way solenoid valve is installed in the liquid passage between the inlet of the second piston cylinder 3 and the liquid storage tank 1; and a fourth one-way solenoid valve is installed in the liquid passage between the outlet of the second piston cylinder 3 and the second valve port. All four one-way solenoid valves are electrically connected to a controller. It can be understood that the fluid inflow and outflow directions of the first piston cylinder 2 and the second piston cylinder 3 can be precisely controlled through these valves, preventing backflow and protecting system components. Simultaneously, the unified control of these one-way solenoid valves by the controller facilitates automated operation and remote monitoring, improving the system's intelligence level and operational efficiency. It should be explained that the first, second, third, and fourth one-way solenoid valves all allow fluid to flow in only one direction. When any one-way solenoid valve is energized, the valve core is magnetized and moves, opening the fluid passage. When any one-way solenoid valve is de-energized, the valve core is reset by spring force or fluid pressure, closing the fluid passage. This ensures that the fluid can flow in the preset direction between the piston cylinder, the reservoir 1, and the valve port. It should be noted that the specific structure of the one-way solenoid valve is existing technology and will not be described in detail here.

[0041] In one feasible embodiment, initially, all one-way solenoid valves (first, second, third, and fourth one-way solenoid valves) are closed, blocking the fluid passage. When the controller receives a command from an external or internal system, it sequentially sends energizing signals to the corresponding one-way solenoid valves. For example, when the first piston cylinder 2 needs to operate, the first one-way solenoid valve opens first, allowing fluid to flow from the reservoir 1 into the first piston cylinder 2; subsequently, the second one-way solenoid valve opens, allowing fluid to flow out from the outlet of the first piston cylinder 2 to the first valve port. Similarly, when the second piston cylinder 3 needs to operate, the third and fourth one-way solenoid valves open sequentially, controlling the flow of fluid in the second piston cylinder 3. After the fluid transmission action is completed, the controller sends an de-energizing signal to the corresponding one-way solenoid valve, which closes, cutting off the fluid passage and preventing fluid backflow.

[0042] Specifically, the flow sensor 6 is disposed in the liquid passage between the outlet of the first piston cylinder 2 and the filling head 5. The flow sensor 6 includes a stator housing, a magnetic rotor, and a Hall switch. The Hall switch is fixed to the stator housing, which has a measuring chamber and an inlet and an outlet connected to the measuring chamber. The magnetic rotor is rotatably disposed in the measuring chamber. The Hall switch is electrically connected to a controller. Liquid entering the measuring chamber from the inlet drives the magnetic rotor to rotate and then flows out from the outlet. Specifically, the flow sensor 6 in this embodiment is a Hall sensor. Optionally, the flow sensor 6 in this embodiment can be disposed between the outlet of the first piston cylinder 2 and the three-way valve 4, or between the three-way valve 4 and the filling head 5.

[0043] Understandably, when fluid enters the measuring chamber from the inlet, it drives the magnetic rotor to rotate. The magnetic poles on the magnetic rotor change with rotation, thereby altering the magnetic field strength around the Hall switch. The Hall switch outputs a corresponding electrical signal based on the change in magnetic field strength. This signal is proportional to the fluid flow rate. By measuring the electrical signal output by the Hall switch, the fluid flow rate can be calculated. In a feasible embodiment, when the piston of the first piston cylinder 2 moves, the fluid is compressed and flows out from its outlet into the measuring chamber of the flow sensor 6. The fluid drives the magnetic rotor inside the measuring chamber to rotate, and the magnetic poles on the magnetic rotor change with rotation, generating a changing magnetic field. The Hall switch, fixed to the stator housing, can detect the change in the magnetic field generated when the magnetic rotor rotates. Based on the change in magnetic field strength, the Hall switch outputs a corresponding electrical signal. The electrical signal output by the Hall switch is transmitted to the controller, which amplifies, filters, and digitizes the signal to calculate the actual fluid flow rate. The controller compares the calculated flow rate data with a preset value. If there is a difference, the flow rate deviation is corrected by adjusting the piston movement of the second piston cylinder 3, ensuring the accuracy and consistency of the filling process.

[0044] Specifically, the controller is a programmable logic controller (PLC). This means that a PLC is used as the system's control center to improve the flexibility, reliability, and automation of the fluid transmission and filling system. A PLC is a digital electronic system designed specifically for industrial environments. It uses a programmable memory to store instructions for performing logical operations, sequential control, timing, counting, and arithmetic operations, and controls various types of machinery or production processes through digital or analog input / output. In this design, the PLC acts as the controller, receiving signals from field devices such as flow sensors and one-way solenoid valves. It processes these signals according to preset program logic and then outputs control signals to the corresponding actuators, such as one-way solenoid valves and piston cylinders, to achieve precise control of the fluid transmission and filling process. The programmability of the PLC allows the system to be flexibly configured and adjusted according to different filling requirements and fluid characteristics, improving the system's adaptability and flexibility.

[0045] Specifically, the inner wall of the flow channel of filling head 5 is coated with polytetrafluoroethylene (PTFE). PTFE is a high-molecular-weight polymer with an extremely low coefficient of friction (typically less than 0.05), allowing for smoother fluid sliding on the inner wall of the flow channel. Furthermore, PTFE exhibits excellent chemical stability, resisting various corrosive media such as acids, alkalis, and organic solvents without reacting chemically with the fluid. Simultaneously, PTFE's non-adhesive properties prevent fluid from adhering to or depositing on the inner wall of the flow channel, thus reducing the frequency of cleaning and maintenance.

[0046] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A device for the dosing and filling of edible beverages, characterized in that it comprises: The quantitative filling device comprises a liquid storage tank, a filling head, a first piston cylinder, a second piston cylinder and a three-way valve, the inlet of the first piston cylinder is connected with the liquid storage tank, the outlet of the first piston cylinder is connected with a first valve port of the three-way valve; the inlet of the second piston cylinder is connected with the liquid storage tank, the outlet of the second piston cylinder is connected with a second valve port of the three-way valve; the filling head is connected with a third valve port of the three-way valve, the third valve port of the three-way valve is an output end, and the three-way valve is used for switching the communication between the first piston cylinder or the second piston cylinder and the filling head. The quantitative filling device further comprises a controller and a flow sensor connected with the controller, the flow sensor is used for detecting flow data of the filling head, and the controller dynamically adjusts the liquid discharge stroke length of the second piston cylinder according to the detection data of the flow sensor, so as to realize quantitative filling.

2. The apparatus according to claim 1, wherein: The first piston cylinder comprises a first cylinder body, a first piston, a first transmission rod and a first power device, the first cylinder body is internally provided with a first cavity; the first piston is arranged in the first cavity, and the outer diameter of the first piston is the same as the inner diameter of the first cavity; the first transmission rod penetrates the upper end of the first cylinder body, and one end of the first transmission rod in the first cylinder body is connected with the first piston, and the other end of the first transmission rod outside the first cylinder body is connected with the first power device. The first power device is connected with the controller in signal, and the first power device is used for driving the first transmission rod to drive the first piston to make linear reciprocating motion in the first cavity. The inlet and the outlet of the first piston cylinder are both arranged at the limit stroke of the first piston away from the first transmission rod.

3. A device for the dosed filling of edible beverages according to claim 2, characterized in that: The first power device comprises a stepping motor, a shaft coupling, a transmission screw and a transmission nut, the transmission screw is drivingly connected with the driving end of the stepping motor through the shaft coupling, the transmission nut is threadedly connected with the transmission screw, and the transmission nut is fixedly connected with the first transmission rod.

4. A device for the dosed filling of edible beverages according to claim 3, characterized in that: The stepping motor is connected with an encoder, and the encoder is electrically connected with the controller.

5. The apparatus according to claim 2, wherein: The second piston cylinder comprises a second cylinder body, a second piston, a second transmission rod and a second power device, the second cylinder body is internally provided with a second cavity; the second piston is arranged in the second cavity, and the outer diameter of the second piston is the same as the inner diameter of the second cavity; the second transmission rod penetrates the upper end of the second cylinder body, and one end of the second transmission rod in the second cylinder body is connected with the second piston, and the other end of the second transmission rod outside the second cylinder body is connected with the second power device; the second power device is connected with the controller in signal, and the second power device is used for driving the second transmission rod to drive the second piston to make linear reciprocating motion in the second cavity. The inlet and the outlet of the second piston cylinder are both arranged at the limit stroke of the second piston away from the second transmission rod; the cross-sectional area of the first cavity is greater than the cross-sectional area of the second cavity.

6. A beverage filling apparatus as claimed in claim 5, wherein: The second power device comprises an electric push rod, and the driving end of the electric push rod is connected with the second transmission rod.

7. The apparatus according to claim 1, wherein: A first one-way electromagnetic valve is arranged in a liquid passage between the inlet of the first piston cylinder and the liquid storage tank, a second one-way electromagnetic valve is arranged in a liquid passage between the outlet of the first piston cylinder and the first valve port, a third one-way electromagnetic valve is arranged in a liquid passage between the inlet of the second piston cylinder and the liquid storage tank, and a fourth one-way electromagnetic valve is arranged in a liquid passage between the outlet of the second piston cylinder and the second valve port; the first, second, third and fourth one-way electromagnetic valves are electrically connected to the controller.

8. The apparatus according to claim 1, wherein: The flow sensor is arranged in a liquid passage between the outlet of the first piston cylinder and the filling head, and comprises a stator housing, a magnetic rotor and a Hall switch. The Hall switch is fixed to the stator housing, the stator housing is provided with a measuring cavity and liquid inlet and outlet ports communicating with the measuring cavity, the magnetic rotor is rotatably arranged in the measuring cavity, and the Hall switch is electrically connected to the controller. Liquid entering the measuring cavity from the liquid inlet port drives the magnetic rotor to rotate and then flows out from the liquid outlet port.

9. The apparatus according to claim 1, wherein: The controller is a programmable logic controller.

10. The apparatus according to claim 1, wherein: The inner wall of the flow channel of the filling head is sprayed with polytetrafluoroethylene.

Images