CN111003230B - Liquid level control method by negative pressure non-contact liquid filling - Google Patents
Liquid level control method by negative pressure non-contact liquid filling Download PDFInfo
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- CN111003230B CN111003230B CN201911343025.0A CN201911343025A CN111003230B CN 111003230 B CN111003230 B CN 111003230B CN 201911343025 A CN201911343025 A CN 201911343025A CN 111003230 B CN111003230 B CN 111003230B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B3/00—Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes, cartons, cans, or jars
- B65B3/26—Methods or devices for controlling the quantity of the material fed or filled
- B65B3/30—Methods or devices for controlling the quantity of the material fed or filled by volumetric measurement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B57/00—Automatic control, checking, warning, or safety devices
Abstract
The invention discloses a liquid level control method for non-contact liquid filling by a negative pressure method, and belongs to the technical field of filling. It comprises the following steps: s1, placing a measuring guide pipe in the filled container, wherein the pipe orifice is positioned at a designated height in the filled container; s2, providing constant negative pressure for the measuring catheter; s3, acquiring the pressure change in the measuring guide pipe caused by the filled liquid material reaching the specified height of the filled container when filling; s4, sending a signal to stop filling after the pressure change reaches a set value; and S5, after the filling is stopped, the liquid is pumped by using the measuring conduit, so that the liquid level of the liquid material in the filled container is reduced to the height which is flush with the pipe orifice. According to the invention, by introducing constant negative pressure into the measuring conduit, when the liquid level reaches the mouth height of the measuring conduit during filling, obvious pressure change in the measuring conduit can be caused, so that the process that the pressure change reaches a set value is accelerated, filling stop is controlled quickly and timely, the filling error is small, the liquid level control is accurate, and the filling efficiency is increased.
Description
Technical Field
The invention belongs to the technical field of filling, and particularly relates to a liquid level control method for non-contact liquid filling by a negative pressure method.
Background
In the streamlined production line of beverage industry and other industries, the packaging of liquid is mostly carried out by adopting a filling valve, the requirements on the quality of products in all aspects are higher and higher along with the market development, the precision requirement on the height of the filled liquid level is higher and higher in the liquid packaging process, and a plurality of users have requirements on the consistency of the height of the liquid level after the liquid is filled, so that the traditional filling method is a challenge.
In the existing liquid filling method, most manufacturers adopt a mechanical filling valve to fill liquid, the filling mode is widely favored due to low cost and convenient processing, but the mechanical valve has poor filling precision, difficult control of filling quantity, long time of valve closing process, easy occurrence of phenomena of large height deviation of filling liquid level, waste of liquid materials and the like, and the filling product is difficult to meet the market demand;
some manufacturers also adopt a flow valve for filling, compared with a mechanical valve, the mode can accurately control the outflow of the filled liquid material and close the valve in time, the precision is far higher than that of the mechanical valve, but the flow valve has high cost and only can accurately control the flow, but cannot accurately control the liquid level height in a filled container, for example, for glass bottles, ceramic containers and the like, because the volume and the shape of an inner cavity have inevitable errors in the manufacturing process, the liquid level heights presented in the containers by the same outflow of the liquid material are different, the requirement of the containers for accurately controlling the filling liquid level height cannot be met only by the flow valve, although a non-contact photoelectric liquid level detector can assist the valve body to control in the market at present, the cost of the filling device is undoubtedly increased, and the non-transparent container cannot be used, the application range is small, and the high cost makes the wide popularization and use difficult.
Through retrieval, the Chinese patent publication number: CN 105217552A; the publication date is as follows: 2016, 1 month, 6 days; discloses a liquid material filling control device and a method, comprising a filling head, a feeding pipe and a storage vat; a feeding valve is arranged in the middle of the feeding pipe, one end of the feeding pipe is connected with the filling head, the other end of the feeding pipe inputs materials to be filled, and the feeding valve controls the circulation and the cut-off of the materials in the feeding pipe; a branch is arranged on the feeding pipe at a position between the flange and the feeding valve, and the branch is connected with the storage cylinder through a threaded pipe; the storage cylinder comprises an air cavity and a material cavity, the air cavity and the material cavity are sealed and isolated through a piston, the air cavity is connected with a control valve through an air pipe, and the material cavity is communicated with a feeding pipe; the control valve guides or cuts off the wind or the atmosphere of the industrial instrument. Although the filling method of this application improves the speed of filling and the accuracy of the filling quantity, it still does not allow for a consistent and precise control of the level of the filling liquid in the container.
Disclosure of Invention
1. Problems to be solved
The invention provides a negative pressure method non-contact liquid filling liquid level control method, aiming at the problem that the liquid level height cannot be efficiently and accurately controlled by the existing filling method.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A negative pressure method non-contact liquid filling liquid level control method comprises the following steps:
s1, placing a measuring guide pipe in the filled container, wherein the pipe orifice is positioned at a designated height in the filled container;
s2, providing constant negative pressure into the measuring catheter;
s3, acquiring the pressure change in the measuring guide pipe caused by the filled liquid material reaching the specified height of the filled container when filling;
and S4, sending a signal to stop filling after the pressure change reaches a set value.
The measuring conduit is a long and thin pipeline, one part of the measuring conduit is positioned outside the container, the other part of the measuring conduit is positioned in the container, the height of a pipe orifice of the measuring conduit positioned in the container relative to the filled container is a fixed value, the end part of the measuring conduit positioned outside the container is connected with a pressure sensor to realize the step S3, the pressure change condition in the measuring conduit is obtained, a trigger value is set for the pressure sensor, when the pressure change value obtained by the pressure sensor reaches the trigger value, a signal is sent to control the filling device to stop filling, a negative pressure device is also arranged to be communicated with the measuring conduit to realize the step S2 to provide constant negative pressure for the measuring conduit, when the filling process starts, liquid materials enter the container through the bottle mouth of the container and fall to the bottom in the container, the liquid level starts to rise, when no liquid exists at the pipe orifice of the measuring conduit positioned in the container when filling starts, the pressure provided by the negative pressure device exists in the measuring conduit, the pressure of the part is uniform and stable, so that the pressure sensor cannot detect obvious pressure change signals, the liquid level in the container continuously rises along with the filling process, when the liquid level rises to the position where the measuring conduit extends into the end pipe orifice, the pipe orifice is sealed, the constant pressure state in the measuring conduit is broken, the pressure in the pipe immediately obviously changes, at the moment, the pressure sensor detects the pressure change in the measuring pipe, a signal is sent out to control the filling device to stop filling, and the aim of controlling the height of the liquid level is fulfilled. In the filling process, the height of the pipe orifice of the stretching end of the measuring pipe is controlled to be consistent when the filled container is filled, when the same liquid material is filled, the liquid level reaches the same height each time, the pressure sensor is triggered to send a signal to control the filling to stop, and the effect that the consistency of the filling height of the whole filling assembly line can be guaranteed is achieved.
Further, the negative pressure in the step S2 is a minute pressure.
Further, still include:
and S5, after the filling is stopped, the liquid is pumped by using the measuring conduit, so that the liquid level of the liquid material in the filled container is reduced to the height which is flush with the pipe orifice.
After filling is finished, the liquid pumping operation is carried out by taking the measuring guide pipe with fixed height as a support, and the liquid material higher than the pipe opening of the measuring guide pipe is pumped away, so that after final filling is finished, the liquid material in the container is the height of the measuring guide pipe extending into the pipe opening surface of the end, and the influence of inconsistent liquid level caused by various errors is overcome.
Furthermore, the position of the measuring conduit is fixed after the height of the measuring conduit is set, and the height of the nozzle in the filled container is controlled by moving and lifting the filled container.
In the scheme, the height of the measuring guide pipe is fixed after being determined, and during each filling, the filled container is moved to the position under the measuring guide pipe and then is lifted, so that the relative height of the measuring guide pipe in the filled container is consistent with the relative height of the measuring guide pipe in the previous filling, and the accurate consistency of liquid level control during each filling is ensured.
Further, the three-way valve is switched to the measuring pipe by connecting the three-way valve to the measuring pipe, wherein two flow ports are connected to the measuring pipe, and the other flow port is communicated with the liquid extracting pipe, so that the liquid extracting operation in the step S5 is realized.
The three-way valve is arranged on the measuring conduit outside the container, the three-way valve is divided into three paths, two paths are communicated with the measuring conduit, one path is communicated with the liquid pumping pipe, when liquid materials are filled, the two paths communicated with the measuring conduit are communicated by the three-way valve, so that the pressure change in the measuring conduit can be effectively detected by the differential pressure sensor, and after filling is stopped, the three-way valve is switched, so that the part, extending into the container opening, of the measuring conduit is communicated with the liquid pumping pipe, and liquid pumping operation is carried out.
Further, in step S3, a differential pressure sensor is used to acquire a change in pressure in the measurement conduit.
According to the scheme, the differential pressure sensor is selected as a device for acquiring the pressure change in the measuring guide pipe, one detection end of the differential pressure sensor is communicated with the measuring guide pipe, specifically, the end part of the measuring guide pipe, which is positioned outside the container, and the other detection end of the differential pressure sensor is communicated with the external environment, so that influence factors caused by the change of atmospheric pressure can be eliminated, and the accuracy of the method for controlling the liquid level height is further ensured.
Further, the filling is effected by a filling unit comprising:
the liquid conveying pipe is used for conveying liquid materials;
the control valve is arranged on the infusion tube and is in signal connection with the differential pressure sensor;
the infusion port is a vertically arranged pipeline, the side wall of the infusion port is communicated with the end part of the discharge of the infusion tube, and the bottom end of the infusion port is used for discharging liquid materials.
A filling unit for realizing the filling operation comprises the transfer line, control valve and transfusion mouth, the transfer line communicates with liquid material head tank, with liquid material to container transmission, control valve locates the transmission and the stopping of control liquid material on the transfer line, wherein control valve is for receiving the control of differential pressure sensor signal, when differential pressure sensor sends stop signal, in time close, cut off the transmission of liquid material, the vertical setting of transfusion mouth, lateral wall and transfer line intercommunication, liquid material flows through the transfer line behind the transfusion mouth, be the downward trend and fall, finally discharge from the bottom of transfusion mouth, the container mouth is stretched into to transfusion mouth bottom in this scheme, splash to the container outside when preventing liquid material from falling down, nevertheless need not to stretch into the container mouth too many, in order to avoid with the liquid material liquid level contact when the filling is accomplished.
Furthermore, one end of the measuring conduit passes through the infusion port pipeline and then extends into the filled container.
The partial measurement pipe and the filling unit assembly are integrated, the partial measurement pipe penetrates through the infusion port, the infusion port is a vertically arranged pipeline, the measurement pipe can penetrate through the hollow pipeline part of the infusion port, the measurement pipe stretches into the container after stretching out of the infusion port, and accordingly the measurement pipe is a thin pipe, the diameter of the measurement pipe is smaller than the diameter of the infusion port, meanwhile, liquid materials transmitted by an infusion pipe flow through the infusion port and the empty space between the measurement pipes to be filled after entering the infusion port, and the measurement pipe and the liquid materials are input without mutual influence.
Furthermore, an anti-splash stop block is arranged on the outer side of the end part of one end of the measuring conduit extending into the filled container.
The anti-splashing stop block is circumferentially arranged on the bulge of the outer side of the end part of the extension end of the measuring conduit, the anti-splashing stop block is used for preventing liquid materials flowing down through the infusion port from falling into the container in a divergent mode under the action of the convex anti-splashing stop block, and the impact of the liquid materials on the liquid surface under the infusion port is reduced, so that the influence of the impact on the air pressure change of the pipe port of the extension end of the measuring conduit is reduced, the splashing liquid materials generated by the falling liquid materials impacting the liquid surface are prevented from rushing into the measuring conduit to influence the detection of the pressure detector, the detection accuracy of the pressure detector is ensured, meanwhile, the falling liquid materials are dispersedly fallen to reduce the impact degree of the falling liquid materials on the liquid surface, the liquid materials are prevented from splashing outside the filling unit and the container, and the cleanness of the filling environment is ensured.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention relates to a liquid level control method for non-contact liquid filling by a negative pressure method, which comprises the steps of after the height of a pipe orifice of a measuring conduit is set, transmitting a container to be filled to a consistent position height, after filling is started, after the height of the liquid level in the container reaches the pipe orifice of the measuring conduit, quickly destroying the constancy of the negative pressure due to the original constant negative pressure in the measuring conduit to cause the pressure change in the measuring conduit, and when the change reaches a certain amplitude so as to meet the set value of the pressure change of a pressure detection device, triggering a signal to stop filling; the method of the invention is not affected by the shape and volume error in the container, and meets the requirement of the consistency of the liquid level of the filled liquid material, and the method has high speed of triggering the pressure change set value, thereby improving the effective filling efficiency;
(2) according to the negative pressure method non-contact liquid filling liquid level control method, constant negative pressure is introduced into the measuring conduit, and when the liquid level reaches the pipe orifice surface height of the measuring conduit during filling, obvious pressure change in the measuring conduit can be caused, so that the process that the pressure change reaches a set value is accelerated, filling stop is controlled more timely, response is rapid, filling errors are small, liquid level control is accurate, and filling efficiency is increased;
(3) according to the liquid level control method for non-contact liquid filling by the negative pressure method, after filling is completed, the liquid pumping operation is carried out by taking the measuring conduit with fixed height as a support, and the liquid material higher than the pipe orifice of the measuring conduit is pumped away, so that after final filling is completed, the liquid material height in the container is the height of the measuring conduit extending into the pipe orifice surface of the end, and therefore the influence of inconsistent liquid level caused by errors is overcome;
(4) according to the negative pressure method non-contact liquid filling liquid level control method, the position of the measuring guide pipe is fixed after the height of the measuring guide pipe is set, and the height of the pipe orifice in the filled container is controlled by moving and lifting the filled container, so that the method is economical and effective, the operation cost of equipment is saved, and the accuracy of relative height is easy to control;
(5) according to the negative pressure method non-contact liquid filling liquid level control method, the differential pressure sensor is selected to obtain the change value of the pressure in the measuring guide pipe, so that influence factors caused by the change of the normal pressure can be eliminated, and the accuracy of the method for controlling the liquid level height is further ensured;
(6) according to the negative-pressure non-contact liquid filling liquid level control method, the control valve can timely respond to a filling stopping signal, the transmission of liquid materials can be timely cut off after filling is in place, the flow direction of the liquid materials is limited to be a vertical flow direction through the vertically arranged infusion port, the liquid materials are vertically and downwards injected into a container, splashing of the liquid materials in the filling process is reduced, and the filling effect of the method is further ensured;
(7) according to the negative-pressure non-contact liquid filling liquid level control method, the three processes of infusion, measurement and liquid pumping can be carried out in the infusion port in an assembly manner through the matching structure of the infusion port and the measurement guide pipe, so that the space occupation is greatly saved, the equipment cost is reduced, the method and the device corresponding to the method have a larger filling application range, the time consumed for conversion among the processes is saved, and the filling efficiency is accelerated;
(8) according to the liquid level control method by adopting the negative pressure method and the non-contact liquid filling method, the anti-splashing stop block is adopted, so that the influence of impact on the pressure change of the pipe orifice at the end, extending into the measuring pipe, of the measuring pipe is reduced, the splashing liquid material generated by the falling liquid material impacting the liquid level is prevented from flowing into the measuring pipe to influence the detection of the pressure detector, the detection accuracy of the differential pressure detector is ensured, meanwhile, the falling liquid material is dispersed and falls to reduce the impact degree of the falling liquid material on the liquid level, the liquid material is prevented from splashing to the outside of the filling unit and the container, and the cleanness of the filling environment is ensured.
Drawings
FIG. 1 is a flow chart of a method for controlling liquid level by non-contact liquid filling with negative pressure according to the present invention;
FIG. 2 is a schematic diagram of an apparatus for carrying out the method of the present invention;
FIG. 3 is a schematic diagram of the apparatus of FIG. 2 illustrating the filling process;
FIG. 4 is a schematic diagram of the apparatus of FIG. 2 illustrating the filling process;
FIG. 5 is an enlarged view of B in FIG. 4;
FIG. 6 is a schematic view of a part of the assembly line of the non-contact liquid filling level control method of the present invention;
fig. 7 is a schematic view of part of the assembly line of the non-contact liquid filling level control method of the negative pressure method for filling.
In the figure:
1. a filling unit; 10. a transfusion tube; 11. a control valve; 12. an infusion port;
2. a detection and control unit; 20. a measurement catheter; 200. a splash-proof stop block; 21. a differential pressure sensor;
3. a three-way valve; 30. a liquid pumping pipe;
4. a negative pressure device.
Detailed Description
The invention is further described with reference to specific embodiments and the accompanying drawings.
Example 1
As shown in fig. 1, the liquid level control method for non-contact liquid filling by negative pressure method of this embodiment includes the following steps:
s1, placing the measuring catheter 20 in the filled container, wherein the nozzle is positioned at a designated height in the filled container;
s2, providing a constant negative pressure into the measuring catheter 20;
s3, acquiring the pressure change in the measuring conduit 20 caused by the filled liquid material reaching the designated height of the filled container when filling;
and S4, sending a signal to stop filling after the pressure change reaches a set value.
Because the inner cavity structure of the filled container has inevitable errors during forming, particularly, the error of the container made of glass and ceramic is larger, the traditional filling device can only accurately control the flow, and can not fill containers with different volumes with liquid level height consistency, the existing filling method for controlling the liquid level height consistency adopts a photoelectric sensor for assistance to detect the filling liquid level, the method has certain limitations, and the photoelectric sensor has great errors for special-shaped containers and non-transparent containers, therefore, the embodiment provides a method for controlling the liquid level by the negative pressure method non-contact liquid filling:
the measuring conduit 20 is a slender pipeline, one part is positioned outside the container, one part is positioned in the container, the height of the nozzle of the measuring conduit 20 positioned in the container relative to the container to be filled is a fixed value, the end part of the measuring conduit 20 positioned outside the container is connected with a pressure sensor to realize the step S3, the pressure change condition in the measuring conduit 20 is obtained, a trigger value is set for the pressure sensor, when the pressure change value obtained by the pressure sensor reaches the trigger value, a signal is sent to control the filling to stop, a negative pressure device 4 is also arranged to be communicated with the measuring conduit 20 to realize the step S2 to provide constant negative pressure for the measuring conduit 20, when the filling process starts, liquid materials enter the container through the container nozzle, fall to the bottom in the container, the liquid level starts to rise, when the filling starts, no liquid exists at the nozzle of the measuring conduit 20 positioned in the container, and the pressure provided by the negative pressure device 4 exists in the measuring conduit 20, the pressure at the position is uniform and stable, so that the pressure sensor can not detect obvious pressure change signals, the liquid level in the container continuously rises along with the filling process, when the liquid level rises to the position that the measuring conduit 20 extends into the end pipe orifice, the pipe orifice is closed, the constant pressure state in the measuring conduit 20 is broken, the pressure in the pipe changes obviously immediately, at the moment, because the pressure sensor continuously measures the pressure in the pipe, the pressure sensor detects the change of the pressure, a signal is sent out to control the filling to stop, the liquid level height is controlled, in the filling process, the height of the pipe orifice of the extending end of the measuring conduit 20 is controlled to be consistent, and the height of the filled container is controlled to be consistent, when the same liquid material is filled, the liquid level reaches the same height every time, the pressure sensor is triggered to send a signal to control the filling to stop, and the effect that the consistency of the filling height can be guaranteed by the whole filling assembly line is achieved.
Although the filling effect of controlling the liquid level consistency can be achieved without introducing constant negative pressure into the measuring conduit 20, negative pressure is not introduced into the measuring conduit 20, and a pressure difference is generated to trigger the pressure sensor when the liquid level is below a part of the pipe orifice of the extending end of the measuring conduit 20.
According to the filling method, after the height of the pipe orifice of the measuring conduit 20 is set, the container to be filled is transmitted to the consistent position height, after filling is started, the height of the liquid level in the container reaches the pipe orifice of the measuring conduit 20, pressure change in the measuring conduit 20 is caused quickly, so that the set value of the pressure change is met, a signal is triggered to stop filling, the influence of the shape and the volume error in the container is avoided, and the requirement of the consistency of the liquid level height of the filled liquid material is met.
Further, the liquid level control method for non-contact liquid filling by a negative pressure method of the embodiment operates by means of the following filling device:
the filling device, as shown in fig. 2, comprises,
a filling unit 1 for filling a container with a liquid material;
the detection and control unit 2 is used for detecting the height of the liquid material in the filled container and controlling the starting and stopping of the filling unit 1;
the monitoring unit 2 comprises a measuring catheter 20 and a pressure sensor;
one end of the measuring conduit 20 extends into the filled container, and the other end is connected with the pressure sensor;
the pressure sensor detects the pressure change in the measuring conduit 20 and is in signal connection with the filling unit 1 to control the start and stop of the filling unit 1; also comprises
And the negative pressure device 4 is connected with the measuring conduit 20 and is used for providing constant negative pressure in the measuring conduit 20.
The filling unit 1 performs the filling operation and stops in time in response to the signal of the pressure sensor; the measuring tube 20 and the pressure sensor together form a detection and control unit 2 for performing operations of acquiring pressure and controlling filling stop, and the negative pressure device 4 is used for performing operations of providing constant negative pressure into the measuring tube 20, and the negative pressure device 4 in the embodiment includes, but is not limited to, a vacuum pump, a suction pump, and the like.
After the measuring conduit 20 is placed at a fixed position in a filled container, the filling unit 1 is started to fill the container, the negative pressure device 4 is started to provide constant negative pressure in the measuring conduit 20, as shown in fig. 3, during filling, the pressure sensor acquires pressure change in the measuring conduit 20 at any time, when the liquid level of the liquid material rises to the level of the port of the measuring conduit 20, the pressure sensor is triggered after the pressure change reaches the set value of the pressure sensor, and a signal is sent to control the filling unit 1 to stop filling.
During filling, the negative pressure P provided by the original negative pressure device 4 in the guide pipe 20 is measured2When the liquid level of the liquid material rises to the same height as the pipe orifice of the extending end of the measuring pipe 20, the negative pressure in the measuring pipe 20 is suddenly increasedIn addition, the liquid level of the liquid material in contact with the measuring pipe 20 is pumped, and the height difference delta H is rapidly generated between the liquid level of the liquid material in the measuring pipe 20 and the liquid level of the liquid material in the container2When Δ P is present in the measuring catheter 20, as shown in FIGS. 3, 4 and 52＝ρLiquid material·g·ΔH2The pressure variation and the negative pressure increasing amount generated by the continuous air suction of the negative pressure device 4 can quickly reach the pressure variation value of the trigger pressure sensor, so that the filling is stopped more timely when the liquid material is filled in place, and the purpose of efficiently and accurately controlling the filling liquid level height is achieved.
According to the filling method, only the pipe orifice of the measuring conduit 20 is in contact with the liquid level in the container in the whole filling process, the phenomenon that the liquid level height is influenced by the fact that the liquid is taken out by the filling device when the container is removed after the filling is finished in the traditional filling method is avoided, the filling valve is not in contact with the filled container in the whole filling process, the non-contact filling is achieved, and the maintenance cost of the filling device is reduced.
Example 2
The method for controlling liquid level by non-contact liquid filling with negative pressure method in this embodiment is further improved on the basis of embodiment 2, and the negative pressure in step S2 is micro-pressure.
In this embodiment, a micro negative pressure with a pressure lower than the normal pressure of 95-140 Pa in the filling environment is provided for the measuring conduit 20, the negative pressure provided by the negative pressure device 4 is not too large or too small easily, the pressure too low than the normal pressure easily affects the sensitivity of the pressure sensor, and affects the accuracy of liquid level control, and the liquid material may be rapidly pumped into the vicinity of the pressure sensor by the too large negative pressure to affect subsequent detection, the pressure too close to the normal pressure can increase the response time of the pressure sensor when the filling liquid level is in place, the pressure provided by the negative pressure device 4 is infinitely close to the normal pressure, and the response time of the device is also infinitely close to the response time of the normal pressure.
Further, the liquid level control method by adopting the negative pressure method and the non-contact liquid filling is applied to filling of fluid materials such as beverages, liquid medicines and liquid seasonings, is particularly suitable for filling of high-density liquid materials, and is larger in density of the liquid materials, large in pressure change caused after filling in place and difficult to be extracted to the position of the differential pressure sensor 21 by the negative pressure device 4 to influence detection, and is beneficial to filling more quickly and accurately.
Example 3
The method for controlling the liquid level by the negative pressure method non-contact liquid filling of the embodiment is further improved on the basis of the embodiments 1-2, and further comprises the following steps:
and S5, after the filling is stopped, the liquid is pumped by the measuring conduit 20, so that the liquid level of the liquid material in the filled container is reduced to the height which is flush with the pipe orifice.
By the method of example 1, the liquid level in each container on the same production line can be basically guaranteed to be level after filling, but two factors which may cause height errors exist: firstly, when stopping filling, the liquid material that has not been discharged continues to drop, error can be produced at this moment, secondly, the liquid level that increases in the time of triggering pressure sensor to the control valve during closing completely after the liquid level of filling liquid material is in place can produce error, theoretically when each parameter is the same in the filling process, error can not appear, but in the actual process probably receive inevitable variable influence such as liquid material uniform degree and make the liquid level height produce less error, the error that produces to the filling of large capacity container can be ignored, but to the filling of some small capacity or special dysmorphism containers, the error is very likely to cause obvious visual change, therefore, the method of this embodiment still includes S5 step.
After filling, the liquid pumping operation is carried out by taking the measuring conduit 20 with fixed height as a support, and the liquid material higher than the pipe orifice of the measuring conduit 20 is pumped away, so that after final filling is finished, the liquid material height in the container is the height of the measuring conduit 20 extending into the pipe orifice surface of the end, and the influence of inconsistent liquid level caused by error is overcome.
The liquid pumping operation is carried out by taking the measuring conduit 20 with fixed height as a support, the process of repeatedly positioning the height is omitted, the consistency of the liquid level after liquid pumping is ensured, the space of the container opening is limited, the space consumption is saved by using the measuring conduit 20, and the manufacturing cost of the corresponding device is also saved.
Example 4
The liquid level control method for non-contact liquid filling by a negative pressure method is further improved on the basis of embodiments 1-3, the position of the measuring conduit 20 is fixed after the height is set, and the height of the pipe orifice in a filled container is controlled by moving and lifting the filled container.
The height of the measuring tube 20 is fixed after being determined, and the relative height of the measuring tube 20 in the filled container is consistent with the relative height of the previous time by moving the filled container to be right below the measuring tube 20 and then lifting the filled container during each filling, so that the accurate consistency of the liquid level control during each filling is ensured.
For the method of the present application, since the measuring tube 20 and the series of devices connected thereto are bulky compared to the container to be filled, it is not economical to control the height uniformity at each filling by lifting the measuring tube 20, so that the present embodiment selects to control the relative height by lifting the container to be filled, which is convenient for adjustment and control, saves energy consumption, and helps to ensure the accurate uniformity of the filling level height.
Example 5
The method for controlling the liquid level by negative pressure non-contact liquid filling of the embodiment is further improved on the basis of the embodiments 1 to 4, and the three-way valve 3 is connected to the measuring conduit 20, wherein two flow ports are connected to the measuring conduit 20, the other flow port is connected to the liquid extracting pipe 30, and the three-way valve 3 is switched to realize the liquid extracting operation in the step S5.
The present embodiment realizes the liquid drawing operation in the step S5 by the cooperation of the three-way valve 3 and the liquid drawing tube 30.
The three-way valve 3 of this embodiment is disposed on the measuring conduit 20 outside the container, the three-way valve 3 is divided into three paths, two paths communicate with the measuring conduit 20, and one path communicates with the liquid pumping pipe 30, when the liquid material is filled, the three-way valve 3 makes two paths communicating with the measuring conduit 20 communicate with each other, so that the differential pressure sensor 21 can effectively detect the pressure change in the measuring conduit 20, and after the filling is stopped, the three-way valve 3 is switched, so that the portion of the measuring conduit 20 extending into the container opening communicates with the liquid pumping pipe 30, and the liquid pumping operation is performed.
During filling, when the liquid level in the container reaches the pipe orifice of the extending end of the measuring pipe 20, the pressure change generated in the measuring pipe 20 reaches a set value to trigger the differential pressure sensor 21, then a signal is sent to stop the transmission of the filling unit 1, after the filling unit 1 stops, the three-way valve is switched to connect the liquid pumping pipe 30 and the extending end of the measuring pipe 20, the end part of the liquid pumping pipe 30 is connected with a liquid pumping mechanism, such as a water pump, a negative pressure chamber and the like, for liquid pumping operation, the liquid material which does not pass through the pipe orifice of the extending end of the measuring pipe 20 is pumped out until the liquid level drops to the pipe orifice level, the liquid pumping pipe 30 can not continue to pump the liquid material, therefore, the consistency of each filling liquid level height is further ensured, the influence of errors on the liquid level height is avoided, due to the timeliness of the pressure detection of the method, the signal is triggered to close the filling unit 1 after each time of filling to a constant liquid level, therefore, the amount of the redundant liquid material needing to be pumped is small, which is different from the large pumping amount in the pumping process in the traditional filling procedure, and the loss and the recovery cost of the liquid material in the embodiment are both smaller than those in the traditional filling procedure.
Example 6
The liquid level control method for non-contact liquid filling by a negative pressure method is further improved on the basis of the embodiments 1 to 5, and in the step S3, the pressure change in the measuring conduit 20 is obtained by adopting the differential pressure sensor 21.
The common pressure sensor can be used for acquiring a change value of the pressure in the measuring conduit 20, and because the atmospheric pressure can change along with factors such as the environment, and the change of the atmospheric pressure in the filling process can possibly have a certain influence on the pressure change value acquired by the pressure sensor, so that the timing for controlling the stopping of the filling can have a certain change, therefore, the embodiment selects and uses the differential pressure sensor 21 as a device for acquiring the change of the pressure in the measuring conduit 20, one detection end of the differential pressure sensor 21 is communicated with the measuring conduit 20, specifically, the end of the measuring conduit 20 located outside the container, and the other detection end is communicated with the external environment, thereby eliminating the influence factor caused by the change of the atmospheric pressure, and further ensuring the accuracy of the liquid level control of the method.
Example 7
The method for controlling the liquid level by the negative pressure method non-contact liquid filling is further improved on the basis of the embodiments 1-6, the filling is realized through the filling unit 1, and the filling unit 1 comprises:
a liquid transport tube 10 for transporting liquid materials;
a control valve 11 provided on the infusion tube 10 and signal-connected to the differential pressure sensor 21;
and the infusion port 12 is a vertically arranged pipeline, the side wall of the infusion port is communicated with the end part of the discharge of the infusion tube 10, and the bottom end of the infusion port is used for discharging liquid materials.
A filling unit 1 for realizing filling operation comprises transfer line 10, control valve 11 and transfusion mouth 12, transfer line 10 and liquid material head tank intercommunication, with liquid material to container transmission, control valve 11 locates the transmission and the stopping of control liquid material on transfer line 10, wherein control valve 11 receives the control of differential pressure sensor 21 signal, when differential pressure sensor 21 sends stop signal, in time close, cut off the transmission of liquid material, transfusion mouth 12 is vertical to be set up, the lateral wall communicates with transfer line 10, liquid material flows through transfer line 10 to transfusion mouth 12 after, be the downward trend and fall, finally discharge from the bottom of transfusion mouth 12, transfusion mouth 12 bottom stretches into the container mouth in this embodiment, prevent that liquid material from falling outside to the container, nevertheless need not to stretch into the container mouth too much, with the liquid material liquid level contact when the filling is accomplished of splashing.
The control valve 11 of the present embodiment includes, but is not limited to, a valve body that can be opened and closed by a signal, such as an electromagnetic control valve, a pneumatic control valve, a hydraulic control valve, a mechanical control valve, and the like.
This embodiment can in time respond the signal that stops the filling through control valve 11, can in time cut off the transmission of liquid material after the filling targets in place, and infusion mouth 12 through vertical setting is defined the flow direction of liquid material for vertical flow direction, and during the container was pour into to the vertical side down, reduce splashing of filling in-process liquid material, further ensured the filling effect.
Example 8
The liquid level control method for non-contact liquid filling by a negative pressure method in the embodiment is further improved on the basis of the embodiments 1 to 7, and one end of the measuring conduit 20 penetrates through the pipeline of the infusion port 12 and then extends into a container to be filled.
This embodiment is as an organic whole with part measurement conduit 20 and 1 assembly of filling unit, with part measurement conduit 20 run through infusion mouth 12 and set up, because infusion mouth 12 is the pipeline of vertical setting, measurement conduit 20 can run through the hollow pipeline part of infusion mouth 12, stretch into in the container after stretching out from infusion mouth 12, it is corresponding, it is originally the tubule to measure conduit 20, its diameter is less than infusion mouth 12 pipe diameter, meanwhile, the liquid material of transfer line 10 transmission flows through from the vacancy between infusion mouth 12 and measurement conduit 20 behind the infusion mouth 12 and carries out the filling, measurement conduit 29 and liquid material input are each other not influenced.
Because the diameter of the container opening of the filled container is limited, the infusion opening 12 and the measuring conduit 20 separately extend into the container opening to occupy more space, some small-mouth containers are not convenient to extend into, and the measuring conduit 20 is a thin tube, the extending end of the external measuring conduit 20 has the probability of touching the container opening when the small-mouth container is filled, and the measuring conduit 20 is easy to damage.
In the embodiment, through the matching structure of the infusion port 12 and the measuring conduit 20, three processes of infusion, measurement and liquid extraction can be integrated and carried out in the infusion port 12, so that the space occupancy rate is greatly saved, the equipment cost is reduced, and the device corresponding to the method and the device have a wider filling application range.
Example 9
The liquid level control method for non-contact liquid filling by a negative pressure method is further improved on the basis of the embodiments 1 to 8, and a splash-proof stop 200 is arranged on the outer side of the end part of the measuring conduit 20 extending into the filled container.
The anti-splash baffle 200 of this embodiment locates the arch that measuring pipe 20 stretches into the end outside for circumference, through anti-splash baffle 200, the liquid material that flows down through transfusion mouth 12, under the effect of bellied anti-splash baffle 200, fall into the container in being the formula of dispersing, reduce liquid material to the impact of transfusion mouth 12 under the liquid level, therefore, reduced the impact and stretched into end mouth department pressure variation's influence to measuring pipe 20, the liquid material that splashes that also prevents falling liquid material impact liquid level and produce gushes into measuring pipe 20 and influence differential pressure detector 21's detection, ensure the accuracy that differential pressure detector 21 detected, simultaneously, it reduces its impact degree to the liquid level to drop the liquid material dispersion, prevent that liquid material from splashing outside filling unit 1 and the container, ensure the cleanness of filling environment.
Example 10
The method for controlling the liquid level by the negative pressure method non-contact liquid filling of the embodiment is further improved on the basis of the embodiments 1 to 9, and further comprises the following steps:
s6, before filling, purging the measuring line 20 at least once.
The operation of sweeping of this embodiment can blow through the intercommunication device of sweeping on measuring pipe 20, before the filling begins, can start the device of sweeping for a short time once or many times, blow to measuring pipe 20 through the device of sweeping to ensure that measuring pipe 20 is unobstructed state, prevent to have remaining liquid material to block up the measuring pipe 20 mouth of pipe, ensure that differential pressure sensor 21's detection is not influenced.
The schematic diagrams of the device based on the method when the assembly line filling is carried out are shown in fig. 6 and fig. 7, the device change schematic diagrams from the filling start to the filling start of the next container to be filled are sequentially arranged in the sequence of the numbers of (r) -r in the diagrams, the method is operated by the device, the process is simple, the time is short, the filling of the container with the consistent liquid level can be effectively and accurately finished, the consumption of liquid materials by each filling is very little, the requirement of liquid level consistency can be basically met by one filling, the liquid pumping amount in the liquid pumping process is very small, compared with the traditional filling, too much liquid materials can not be consumed in too much time, the cost is low, the efficiency is high, the accuracy is high, and the method is suitable for being widely applied by manufacturers.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A method for controlling liquid level by non-contact liquid filling with a negative pressure method is characterized in that filling is realized through a filling unit (1), and the filling unit (1) comprises:
a liquid transport tube (10) for transporting liquid material;
a control valve (11) which is arranged on the infusion tube (10) and is in signal connection with a differential pressure sensor (21);
the infusion port (12) is a vertically arranged pipeline, the side wall of the infusion port is communicated with the end part of the discharge of the infusion tube (10), and the bottom end of the infusion port is used for discharging liquid materials; the outer side of the end part of one end of the measuring conduit (20) extending into the filled container is provided with a splash-proof stop block (200); the splash-proof stop block (200) is a protrusion which is circumferentially arranged on the outer side of the end part of the extending end of the measuring conduit (20);
the method comprises the following steps:
s1, placing a measuring catheter (20) in the filled container, wherein the nozzle is positioned at a specified height in the filled container;
s2, providing constant negative pressure into the measuring catheter (20);
s3, acquiring the pressure change in the measuring guide pipe (20) caused by the filled liquid material reaching the designated height of the filled container when filling;
and S4, sending a signal to stop filling after the pressure change reaches a set value.
2. The liquid level control method for non-contact liquid filling by negative pressure method according to claim 1, wherein: the negative pressure in the step S2 is a minute pressure.
3. The liquid level control method for non-contact liquid filling by a negative pressure method according to any one of claims 1 to 2, further comprising:
and S5, after the filling is stopped, the liquid is pumped by using the measuring conduit (20), so that the liquid level of the liquid material in the filled container is reduced to the height which is flush with the pipe orifice.
4. The liquid level control method for non-contact liquid filling by negative pressure method according to claim 3, wherein: the position of the measuring conduit (20) is fixed after the height is set, and the height of the nozzle in the filled container is controlled by moving and lifting the filled container.
5. The liquid level control method for non-contact liquid filling by negative pressure method according to claim 4, wherein: the liquid extracting operation of the step S5 is realized by switching the three-way valve (3) by connecting the three-way valve (3) to the measuring tube (20), wherein two flow ports are connected to the measuring tube (20), and the other flow port is connected to the liquid extracting tube (30).
6. The liquid level control method for non-contact liquid filling by negative pressure method according to claim 1, wherein: in step S3, a differential pressure sensor (21) is used to acquire a change in pressure in the measurement duct (20).
7. The liquid level control method for non-contact liquid filling by negative pressure method according to claim 6, wherein: one end of the measuring conduit (20) passes through the pipeline of the infusion port (12) and then extends into the filled container.
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| CN114771983B (en) * | 2022-05-09 | 2023-08-01 | 广东轻工职业技术学院 | Liquid level control system and automatic filling machine based on temperature change |
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| CN201980980U (en) * | 2010-12-22 | 2011-09-21 | 广东轻工机械二厂有限公司 | Beer filling valve |
| CN103159155A (en) * | 2011-12-13 | 2013-06-19 | 克罗内斯股份公司 | Filling head for filling containers |
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| DE102011106832A1 (en) * | 2011-07-06 | 2013-01-10 | Krones Aktiengesellschaft | Method for determining the integrity and tightness of containers in filling plants |
| CN202903413U (en) * | 2012-11-14 | 2013-04-24 | 新乡职业技术学院 | Back pressure measuring device for beer filling machine |
| CN107179105A (en) * | 2017-06-05 | 2017-09-19 | 神华集团有限责任公司 | Flow measurement device |
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| CN201980980U (en) * | 2010-12-22 | 2011-09-21 | 广东轻工机械二厂有限公司 | Beer filling valve |
| CN103159155A (en) * | 2011-12-13 | 2013-06-19 | 克罗内斯股份公司 | Filling head for filling containers |
| CN108489537A (en) * | 2018-02-11 | 2018-09-04 | 唐山钢铁集团微尔自动化有限公司 | A kind of heater for rolling steel pollutant emission automatic monitoring device |
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