CN112850615B

CN112850615B - Liquid quantitative filling device and method

Info

Publication number: CN112850615B
Application number: CN202110196008.XA
Authority: CN
Inventors: 沙宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-22
Filing date: 2021-02-22
Publication date: 2023-03-10
Anticipated expiration: 2041-02-22
Also published as: CN112850615A

Abstract

In the embodiment of the invention, a measuring tool with a quantitative metering function, such as a filling valve, is not adopted, but a flowmeter is directly adopted to carry out dynamic metering on liquid flowing through, and the opening and closing of an electromagnetic valve are controlled according to the dynamic metering, so that the starting and stopping states of filling are conveniently controlled. The filling channel adapted by the mode is relatively compact, the elbow effect is avoided, and the flow resistance is small. Because the control points are very few, the starting and stopping control of the electromagnetic valve is mainly adopted, the links are few, the accumulated fault points are few, and the integral fault rate is relatively low.

Description

Liquid quantitative filling device and method

Technical Field

The invention relates to a liquid quantitative filling device and a liquid quantitative filling method.

Background

The liquid quantitative filling machine is a device for metering and filling by controlling the volume of liquid filled into a packaging container, and the current liquid filling industry generally adopts a mechanical quantitative filling mode or an electronic quantitative filling mode for quantitative filling. The mechanical quantitative filling mode is influenced by the difficulty in changing the capacity of the self-metering container and tends to be eliminated, and the electronic quantitative filling mode is gradually the mainstream of the market.

Electronic quantitative filling still needs to be based on mechanical quantitative filling equipment, and an electric control part is adapted on the basis, so that filling control is carried out on a mechanical quantitative device through control elements such as a control valve and the like. The working principle of the electronic quantitative filling mode is as follows: opening a liquid inlet valve in the mechanical quantitative device, injecting liquid into a quantitative measuring device in the mechanical quantitative device, closing the liquid inlet valve after a preset amount is reached, opening a liquid outlet valve, and injecting the liquid into a container to be filled according to the preset amount. The main disadvantages of electronic quantitative filling are that the control flow is complex, the cost is high, and the cleaning of filling equipment applied to food grade is difficult.

It should be noted that, both the mechanical quantitative filling and the electronic quantitative filling need to be provided with independent measuring tools such as measuring cups, the liquid amount entering the measuring cups is ensured to be the designed amount, then the liquid inlet valve is closed, the liquid outlet valve is opened to inject the liquid in the measuring cups into the containers to be filled, in the process, at least two control points are provided, namely the liquid inlet valve and the liquid outlet valve, and the filling needs to pass through an intermediate stage, namely the measuring needs to be performed through the given measuring cups, the overall efficiency is relatively low, the number of the control points is large, and the probability of failure is increased. The increase of the intermediate links also causes the overall structure to be larger and the space occupation to be relatively more.

In addition, no matter mechanical filling or electronic quantitative filling, the liquid enters the to-be-filled container from the liquid tank, the liquid needs to pass through a complex liquid path, the flow resistance is large, and the filling precision control is relatively difficult.

Disclosure of Invention

The invention aims to provide a liquid quantitative filling device which is relatively compact in structure and relatively low in failure rate, and further provides a liquid quantitative filling method.

In an embodiment of the present invention, there is provided a liquid quantitative filling apparatus, which has a basic structure including:

a feed pipe;

a flow meter mounted on the feed pipe to meter a liquid flow rate;

the electromagnetic valve is arranged on the feeding pipe to control the on-off of the feeding pipe; the solenoid valve is connected to the flow meter or via a control unit to control the cut-off time of the solenoid valve by metering a given amount of liquid.

Optionally, the flow meter is an electromagnetic flow meter or a turbine flow meter.

Optionally, the flow meter comprises:

the shell is provided with a port on one side;

the guide pipe assembly is arranged on the shell and is connected with the feeding pipe in a matching mode;

the flow detection circuit is positioned in the shell and used for metering the liquid flowing through the flow guide pipe assembly;

a cover plate mounted on the ported side of the housing to seal the port in a fluid-tight manner.

Optionally, the flow detection circuit and the flow guide pipe assembly use the cover plate as an installation base body;

correspondingly, a cable externally connected with the flow detection circuit is led out from the cover plate;

the position of the shell, which is aligned with the flow guide pipe assembly, is provided with a through hole for the flow guide pipe assembly to penetrate out.

Optionally, the via hole is provided with a female spigot;

correspondingly, the first part of the flow guide pipe assembly matched with the via hole is provided with a convex spigot matched with the concave spigot.

Optionally, a sealing ring is arranged at a matching position of the concave spigot and the convex spigot or a pipe section where the via hole is matched with the flow guide pipe assembly.

Optionally, the detecting element of the flow detecting circuit of the turbine flowmeter is mounted on a substrate, and the probe of the detecting element protrudes from one surface of the substrate;

correspondingly, a pit for probing is arranged on a flow guide pipe assembly matched with the flow meter.

In an embodiment of the present invention, there is also provided a liquid quantitative filling method, including:

filling the containers which are currently transferred in place through a feeding pipe provided with an electromagnetic valve;

measuring the liquid volume from the current container to the current time by a flowmeter arranged on the feeding pipe, and sending out an instruction of stopping filling after the liquid volume is measured to a given value;

the solenoid valve closes in response to the command.

Optionally, observing or detecting the liquid level when the container is filled, and stopping to overhaul the electromagnetic valve if the liquid level is still changed; or

And adjusting the working parameters of the flowmeter.

Optionally, the operating parameters include at least a start delay time and a stop delay time.

Optionally, the current flow rate is detected, and if the flow rate is out of tolerance, a fault code is output.

In the embodiment of the invention, a measuring tool with a quantitative measuring function, such as a filling valve, is not adopted any more, but a flowmeter is directly adopted to dynamically measure the liquid flowing through, and the opening and closing of the electromagnetic valve are controlled according to the dynamic measuring, so that the starting and stopping states of filling are conveniently controlled. The filling channel adapted by the mode is relatively compact, the more pipe bending effect is avoided, and the flow resistance is small. Because the control points are very few, the starting and stopping control of the electromagnetic valve is mainly performed, the links are few, the accumulated fault points are few, and the integral fault rate is relatively low.

Drawings

Fig. 1 is a schematic main sectional structure view of a liquid quantitative filling apparatus in a first embodiment.

Fig. 2 is a schematic main sectional structure diagram of a liquid quantitative filling device in a second embodiment.

Fig. 3 is a schematic view illustrating a state where the housing and the cover plate are separated from each other in the first embodiment.

Fig. 4 is a schematic view of a sensor mounting structure in the third embodiment.

Fig. 5 is a front view structural diagram of a sensor in the third embodiment.

Fig. 6 is a schematic top view of the sensor in the third embodiment.

Fig. 7 is a schematic block diagram of a control circuit of the liquid quantitative filling apparatus according to an embodiment.

Fig. 8 is a flow chart of a liquid quantitative filling method in the second embodiment.

FIG. 9 is a schematic diagram of a sensor circuit in one embodiment.

In the figure: 1. the magnetic field sensor comprises a potential detection electrode, 2. A honeycomb duct assembly, 3. A magnetic field loop module, 4. A shell, 5. A wiring, 6. A circuit board, 7. An insulating seat, 8. A screw, 9. A cover plate, 10. An aviation connector, 11. A shielding cable, 12. A magnetic field driving unit, 13. An O-shaped ring, 14. A turbine assembly, 15. A through hole, 16. A concave spigot, 17. A pipe connector, 18. A column head, 19. A convex spigot, 20. A bearing platform, 21. A screw, 22. A pipe body, 23. A thread pair, 24. A screw hole, 25. A screw, 26. A sensor, 27. A substrate, 28. A sensor element, 29. A lead, 30. A mounting hole and 31. A wiring head.

Detailed Description

It should be noted that the flow meter (flowmeter), which is a meter for measuring the flow rate of a fluid in a pipe or an open channel, is itself provided with a pipe, which is referred to as a flow guide pipe assembly 2 in the embodiment of the present invention, and the "pipe" in the "meter for measuring the flow rate of a fluid in a pipe is a broadly referred to as a measurement object, which is referred to as a feed pipe in the embodiment of the present invention.

Furthermore, the flow duct assembly 2 is mounted on the feed pipe, or the flow duct assembly 2 forms part of the overall feed line.

The flowmeter belongs to a mature technology, and a plurality of types of flowmeters are developed, such as a differential pressure flowmeter, a rotor flowmeter, a throttling flowmeter, a slit flowmeter, a volume flowmeter, an electromagnetic flowmeter, an ultrasonic flowmeter and the like are common, in the embodiment of the invention, the rotor flowmeter and the electromagnetic flowmeter are taken as examples for description, in the first embodiment, the electromagnetic flowmeter is taken as an example for description, and in the second embodiment, the rotor flowmeter is taken as an example for description; it should be appreciated that other types of flow meters may be substituted for each other in their function of sensing the flow of fluid in the pipe in which they are installed.

The flow guide pipe assembly 2 and the feeding pipeline can be directly connected through threads or flanges, and in some embodiments, a ferrule type connecting structure can be further adopted.

In addition, the electromagnetic valve used in the embodiment of the present invention is a valve which is installed on the feeding pipe and is used for controlling the on-off of the feeding pipe, and belongs to one of the valves with the simplest function, and is not shown in the attached drawings of the specification. Likewise, for the feeder tube, there is no expanded description or drawing indication based on the same considerations.

As a general configuration of the liquid dosing device, it has a feeding tube (not shown in the drawings of the description) provided with, for example, a positioning device for the mouth of the bottle, through which, for example, the beverage is fed into the container to be filled, for example a beverage bottle.

In the exemplary embodiment of the invention, the general configuration of the liquid dosing device is also a flow meter and a solenoid valve, wherein the solenoid valve has been indicated above, which is used only for controlling the opening and closing of the dosing pipe, belongs to the simplest application of the solenoid valve and is not shown in the figures of the present example.

In a preferred embodiment, the solenoid valve is located at the latter stage of the flow meter to reduce the effect of fly-stock on metering accuracy. The flying material refers to liquid which passes through the electromagnetic valve and does not enter a container to be filled, the flying material can be determined according to empirical data, and generally, the larger the flying material amount is, the larger the error is, therefore, the electromagnetic valve is arranged at the later stage to be closer to the outlet of the feeding pipe, and the error of flying material compensation can be reduced.

Correspondingly, the electromagnetic valve is connected with the feeding pipe in a matching mode, the main purpose of the electromagnetic valve is to control the on-off of the feeding pipe, the source end of the control is from the flow meter, therefore, a control unit such as a controller can be matched, and the electromagnetic valve can be controlled according to a preset algorithm through a control element configured on the flow meter.

The control of the solenoid valve by means of the switching value is a relatively simple control method, whereby the control can also be performed by means of e.g. a relay, which is relatively easy to achieve with higher control accuracy using intelligent devices than relays that are prone to be subjected to larger environmental factors.

Since the control of the solenoid valve is based on the on-off control, the control unit, such as a controller, has relatively few control points for the single liquid dosing device, and thus has relatively few points of failure.

It should be understood that several, more than ten, or even more than ten liquid quantitative filling devices are often disposed on the filling equipment, so that the aforementioned control unit is usually composed of one or more PLCs (master and slave), and the number of the PLCs can be relatively reduced because of the small number of control points compared with the conventional liquid filling valves.

For a flowmeter, the flowmeter is usually used for metering the dynamic flow of liquid, and relatively accurate metering can be realized by matching with the on-off function of an electromagnetic valve.

Correspondingly, the flow meter is also mounted on the feed pipe.

Fig. 1 shows an electromagnetic flowmeter according to a first embodiment, fig. 2 shows a turbine flowmeter according to a second embodiment, and fig. 4 shows a schematic structure of a sensor in a turbine flowmeter according to a third embodiment. The basic structure of the flowmeter can be roughly shown in these three embodiments.

In the embodiment of the invention, besides the main improvement of the cooperation of the flowmeter and the electromagnetic valve, the invention also relates to the improvement of the flowmeter, and one is that the cover plate 9 of the flowmeter is used as a mounting base body, so that the flowmeter has better maintainability; and secondly, a flat sampling assembly is adopted, so that the physical size of the sensor is reduced, and the size of the sensor is reduced.

In the embodiments shown in fig. 1 to 3, the flowmeter includes a casing 4 and a cover plate 9, and a casing is also formed after sealing assembly, main components of the flowmeter are installed in the casing and protected by the casing, and the cover plate 9 is used as an installation base for the main components, wherein in an assembly structure of the casing, one end of the draft tube assembly 2 is supported at a via hole 15 formed in the casing 4.

The housing 4 is constructed in a substantially rectangular box shape, and is generally mounted in a vertical structure as shown in fig. 1, and the vertical direction in the drawing is the vertical direction in the mounted state.

The right side of the casing 4 is a mouth part at the right side as shown in fig. 3, or the opening of the casing 4 is opened at the right side as shown in fig. 3, when the casing needs to be opened for maintenance of the flowmeter, the locking between the casing 4 and the cover plate 9 is released (for example, the connection through the screw 20), the casing 4 is moved to the left, and the parts and elements in the casing are fully exposed, so that the maintenance is easy.

It should be noted that the cover plate 9 forms a cover, and the assembly between the cover plate 9 and the housing 4 is a static connection structure, which is easy to form a seal, in the structure shown in fig. 3, the cover plate 9 and the housing 4 are assembled by using screws 20, and a sealing ring may be disposed on the interface where the cover plate 9 and the housing 4 are combined, so as to improve the sealing capability.

In the structure shown in fig. 3, in order to thin the wall of the housing 4, a support 20, specifically a rectangular ring, is provided in the housing, the rectangular ring is welded to the inner wall surface of the housing 4, and a screw hole is formed in the support for matching with the screw 20.

The depth of the platform 20 is determined by the thickness of the cover plate 9, and in a preferred embodiment, the distance between the outer end face of the platform 20 and the right end face of the housing 4 as shown in fig. 3 is exactly equal to the thickness of the cover plate 9, so that the overall aesthetic appearance of the flowmeter is relatively good.

With regard to the fitting structure between the housing 4 and the cover plate 9, screw holes for fitting the screws 20 may be opened directly on the right end face of the housing 4 as shown in fig. 3, which requires the housing 4 to have a relatively thick thickness.

In some embodiments, the part of the housing where the screw holes are formed may be locally thickened, or instead of thickening the wall of the housing 4, lugs may be provided on the wall of the housing, on which corresponding screw holes are provided.

The flowmeter requires a pipe body, which is the aforementioned draft tube assembly 2, to be provided to be coupled to the feed pipe, and is mounted on the housing 4. It should be noted that, as can be seen from fig. 1 and 2, the draft tube assembly 2 is supported on the housing and needs to be supported by the housing 4, which conforms to the definition of installation in the mechanical field. Although in the preferred embodiment of the invention the connection between the nozzle assembly 2 and the cover plate 9 is based on a static, more reliable connection, or forms an assembly with the cover plate 9, it is finally necessary to assemble the nozzle assembly to the housing 4, and this connection via other structures is also the case in mechanical assembly.

When the cover plate 9 is assembled with the rest of the meter, except for the housing 4, as an assembly, thereby forming a two-part structure as shown in fig. 3, the rest of the meter enclosed by the housing 4 can be fully exposed after the housing 4 is removed. Under the condition, the flow detection circuit and the flow guide pipe assembly 2 needs to use the cover plate 9 as a mounting base body.

The draft tube assembly 2 and the cover plate 9 are mechanically connected, for example, by pipe hole combination shown in fig. 1 to 3, and the combination can be added with screws to improve the connection strength, or the draft tube assembly 2 and the cover plate 9 can be fixedly connected together by directly adopting a welding mode. The threaded connection can also be used, i.e. the flow guide pipe assembly 2 has an external thread and the adapted hole in the cover plate 9 has an internal thread, so that the threaded connection can be directly used.

The cover plate 9 is used as a mounting substrate of the flow detection circuit, and is also provided with a mechanical connection substrate, and the cover plate 9 and the housing 4 are usually made of metal, so that in order to avoid short circuit or assembly grounding, if the circuit board 6 and the cover plate 9 are assembled in an indirect connection manner as much as possible, an insulating seat 7 is specifically provided, and the insulating seat 7 and the cover plate 9 are connected by using a screw 21, and the material of the screw 21 is not required to be considered. And circuit board 7 and insulator seat 7 also can adopt screw 8 to connect, also needn't consider the material of screw 8 this moment, and the assembly structure in view of the above is difficult to produce the short circuit, can effectual protection like circuit board 6.

Furthermore, since the circuit board 6 is mounted on the cover plate 9, a cable for leading out an electric signal is preferably led out from the cover plate 9 to reduce the difficulty of maintenance.

In the embodiment shown in fig. 1 to 3, an aircraft connector 10 is preassembled, for example, on the cover plate 9, in order to facilitate the wiring. Conventional fixed joints may also be used.

For the transmission of the detection signal, the cable is preferably shielded from electromagnetic interference by the shielded cable 11.

The electrical part of the flow meter, mainly the flow detection circuit, is housed in a housing 4, specifically a shell, for metering the liquid flowing through the flow conduit assembly 2.

With regard to the matching relationship between the housing 4 and the duct assembly 2, it can be seen from the attached drawing 3 of the specification, in fig. 3, a through hole 15 is formed at the position where the housing 2 and the duct assembly 4 are aligned, so as to allow the duct assembly 4 to pass through.

In order to improve the automatic positioning performance of the assembly, the through hole 15 is provided with a concave spigot 16; accordingly, the first portion of the draft tube assembly 2 engaged with the through hole 15, such as the pipe joint 17 of the draft tube assembly 2 located at the left end in fig. 3, is provided with the male spigot 19 engaged with the female spigot 16, and positioning can be rapidly achieved based on the engagement of the spigots.

Further, in order to improve the sealing capability, a sealing ring, such as an O-ring shown in fig. 1, is provided at the matching position of the female spigot 16 and the male spigot 19 or at the pipe section where the via hole 15 and the draft pipe assembly 2 are matched.

As can be seen from fig. 1 to 3, the flow detection circuit is divided into two parts, one part is a part directly connected with the object to be measured, i.e., the flow guide pipe assembly 2, or a part directly assembled with the flow guide pipe assembly 2 into a whole, the second part is an independent circuit board 6, and the two parts are connected by a connection wire 5.

The electromagnetic components used in the embodiment shown in fig. 1, such as the magnetic field driving unit 12 and the electric potential detecting electrode 1, and their assembly on the pipeline, such as the draft tube assembly 2, are conventional and will not be described herein again.

While the mounting of the sensor 26 to the flow tube assembly 2 is conventional in fig. 2 for a turbine flow meter, fig. 4 utilizes a new or improved sensor 26.

As can be seen by comparing the shape of the sensor in fig. 2 with the shape of the sensor 26 in fig. 5 and 6, in the embodiment of the present invention, the sensor 26 is configured as a member having a base plate 27, instead of adopting a round-shell package structure, the base plate 27 may be mounted on the draft tube assembly 2 by, for example, screws 25, and a depression may be formed on the draft tube assembly 2, and the sensor element 28 on the sensor 26 is disposed on the side of the base plate 27 opposite to the draft tube assembly 2, which occupies a relatively small space.

The sensor 26 circuit is not changed due to the change of the mechanical structure, and can be seen in particular in the schematic diagram of the sensor 26 circuit shown in fig. 9.

In addition, the circuit principle of the flow meter is not changed by adopting a new mechanical structure, and the circuit principle diagram of the flow meter shown in fig. 7 can be seen. The control of the solenoid valve on the basis of a flow meter is only one application of the flow meter, and the intermediate parameter of the application is the amount of liquid to be metered and the required switching value of the solenoid valve.

Based on the aforementioned liquid quantitative filling device, the adapted liquid quantitative filling method is initialized after the filling system is powered on, at least the start time of filling is read, and the filling is started after external interruption or instruction driving is performed, for example, a container to be filled is in place, and the liquid quantitative filling device is aligned with a bottle opening.

Generally, liquid filling is in assembly line operation, and after a container flows in place along with an assembly line, a filling machine starts filling to the container which is currently flowing in place through a feeding pipe provided with an electromagnetic valve.

During initialization, the filling machine calls some pre-packaged working parameters, such as a set value measured by a flowmeter, and the set value is reached, namely the electromagnetic valve is controlled to be closed, the current filling is finished, and then the next filling cycle is started.

Correspondingly, the liquid amount of the current container which is filled to the current moment is measured and started through a flowmeter arranged on the feeding pipe, and an instruction for stopping filling is sent out after the liquid amount is measured to a given value; the solenoid valve closes in response to the command.

In some embodiments, the liquid level at the end of filling the container is observed or detected, and if the liquid level still fluctuates, the electromagnetic valve is not closed tightly, and the electromagnetic valve is stopped and repaired. The liquid level still changes, which is not necessarily the best time for shutdown maintenance, and the shutdown may not be currently performed, so that the maintenance can be performed after the work period is finished by adjusting the working parameters of the flowmeter, such as shortening the filling time, and the lost liquid amount is smaller because the receiving speed of the flow process is relatively higher.

In some situations, for example, as the liquid level in the storage tank changes, the initial pressure of filling may also change, and as the ambient temperature of the liquid changes, the viscosity of the liquid may also change, which may affect the accuracy of filling, and thus, the time affecting each filling cycle may need to be adjusted to be longer or shorter.

As already mentioned, for filling, there is necessarily a flash and a delayed filling before the filling is started, and for example, the turbine meter will have a certain acceleration time when it starts to rotate from 0, for which purpose the operating parameters include at least a start delay time and a stop delay time to set the filling operating parameters.

Similarly, for the flow rate, the flow rate may be suddenly increased due to other reasons, for example, the bottle mouth is not closed tightly, so that the pressure loss at the mouth of the feeding pipe is more, the flow rate is increased, and therefore, the current flow rate is detected, and if the flow rate is out of tolerance, a fault code is output.

Fig. 8 is a workflow of a rotameter, wherein a part of contents of the workflow belong to basic operating parameters of the rotameter, such as a pulse counter, a total time counter, a turbine start delay counter, a turbine close delay counter, an average rotation speed register, and the like.

Claims

1. A liquid quantitative filling device, characterized by comprising:

a feed pipe;

a flow meter mounted on the feeding pipe to meter a liquid flow rate;

the electromagnetic valve is arranged on the feeding pipe to control the on-off of the feeding pipe; the solenoid valve is connected with the flowmeter or connected via a control unit to control the cut-off time of the solenoid valve by metering a given amount of liquid;

the flow meter includes:

the shell is a rectangular box body with an opening on one side;

the flow detection circuit is positioned in the shell and used for metering the liquid flowing through the flow guide pipe assembly; the sensor of the flow detection circuit is an element with a substrate, the substrate is arranged on the flow guide pipe assembly through a screw, a pit is arranged on the flow guide pipe assembly, and the sensor element on the sensor is arranged on one surface of the substrate opposite to the flow guide pipe assembly;

a cover plate installed on the side with the opening of the shell and sealing the opening in a liquid-tight manner to form a shell, wherein main components of the flowmeter are installed in the shell, and the cover plate is used as an installation base body for removing the shell when the shell is opened, so that the components and the components in the shell are exposed;

the flow detection circuit and the flow guide pipe assembly use the cover plate as an installation base body;

2. The liquid quantitative filling device according to claim 1, wherein the through hole is provided with a female spigot;

3. The liquid quantitative filling device according to claim 2, wherein a sealing ring is provided at a position where the female spigot and the male spigot are engaged or at a pipe section where the through hole is engaged with the draft tube assembly.

4. A method for filling a liquid into a container using the apparatus according to any one of claims 1 to 3, comprising:

measuring the liquid amount from the current container to the current moment by a flowmeter arranged on the feeding pipe, and sending an instruction of stopping filling after the liquid amount is measured to a given value;

the solenoid valve closes in response to the command;

observing or detecting the liquid level when the filling of the container is ended, and stopping the machine to overhaul the electromagnetic valve if the liquid level is still changed; or adjusting an operating parameter of the flow meter;

the working parameters at least comprise starting delay time and stopping delay time; and detecting the current flow rate, and outputting a fault code if the flow rate is out of tolerance.