RU2793698C1 - Reverse blowing molding system and method for its control - Google Patents

Abstract

FIELD: glass production.

SUBSTANCE: invention relates to a system for molding glass bottles by reverse blowing method. The method includes the steps of dividing a predetermined reverse blowing molding time into a plurality of sampling periods with the same time, and setting the same target bottle molding pressure P1 for each of the sampling periods; after starting the bottle blowing process, measuring the actual value of the pressure P2 in the reverse blowing pipe in real time; calculate the error of the air pressure value in accordance with the value of the difference between the target pressure value obtained in the sampling period and the actual pressure value each time the sampling is completed by the formula: P0=P1-P2; calculate a gain value according to the sum of the errors in the air pressure value over the sample periods tested, each time a sample is completed, and adjust the target pressure value by taking the average value of the gain averaged over the remaining sample periods as the correction value until all sampling periods are completed. The glass bottle molding system by reverse blowing comprises a reverse blowing pipeline containing a first pipeline and a second pipeline connected via a T-shaped three-way valve with an air storage device and a primary billet. To perform the claimed control method, the first pipeline is provided with a controller module configured to control the first pipeline for supplying air to the primary blank chamber, while the electrical signal connector on the controller module is connected to the electronic control module via signal lines.

EFFECT: eliminating the appearance of a trace on the bottom of a glass bottle and improving the quality of its finish.

7 cl, 2 dwg

Description

FIELD OF TECHNOLOGY

The present invention relates to the technical field of glass production, in particular to a blow molding system and a method for controlling it.

BACKGROUND OF THE INVENTION

In the production of glass bottles, the bottle glass forming process is an important step. Bottle glass molding refers to the molding of molten glass frit into different glass bottles, in which the molding of primary blanks plays a key role in the whole process.

Generally speaking, employees will use the air blow molding method to mold glass bottles, and use the reverse blow molding process to mold the interior of primary blanks. The blow-back process usually requires a solid glass frit to be blown into the primary preform with the interior space through compressed air for a few seconds. The traditional molding process is to manually press the air valve, visually measure the height of the primary blank with human eyes, and then use the full reverse blow molding process.

However, due to the high requirements of high-quality bottles on the quality of molding, in the traditional reverse blow molding process in which the air valve is manually pressed, the proportion of the manually pressed air valve cannot be well controlled, and the height of the workpiece cannot be accurately and visually measured, which can easily lead to bottle bottom marks, two-piece material phenomenon, poor finish, and high requirements for manual technology and high labor intensity. In addition, the output of compressed air in the blowback pipeline of the blow molding device is not stable, while the blow molding device must operate for a certain time during blow molding. In fact, it is more difficult to make the blowback pipe of the blowback blower blow out air at a predetermined pressure with high precision. Therefore, even if the outlet pressure value is set in advance, it is difficult to maintain an accurate air pressure value for the blowback pipe of the blowback device.

DISCLOSURE OF THE INVENTION

Embodiments of the present application provide a glass bottle reverse blow molding system and a method for controlling the same to solve the problem that it is difficult to maintain a high-precision reverse blow molding output in a prior art reverse blow molding process, which causes a mark on the bottom of the glass bottle, the phenomenon of two-piece material and poor finish.

On the one hand, the present invention provides a method for controlling a back blow molding system for glass bottles, comprising the following steps, in which:

dividing the predetermined back blow molding time into a plurality of sampling periods, and setting the same target bottle molding pressure P1 for each of the sampling periods; after starting the bottle blowing process, measuring the actual value of the pressure P2 in the blowing back pipe in real time; calculating an air pressure value error according to a difference value between the target pressure value and the actual pressure value obtained in the sampling period, according to the formula: P0=P1-P2, each time the sampling is completed; calculate the gain value according to the sum of the errors in the air pressure value for the tested sampling periods, and adjust the target pressure value by taking the average value of the gain value averaged over the remaining sampling periods as the backflow pressure correction value until all sampling periods have been sampled .

In some embodiments, calculating the gain value according to the sum of the errors in the air pressure value over the sample periods tested includes the following step, where:

get the value of ΔР gain by the formula:

- сумма фактических значений давления испытанных периодов выборки.where P1 is the target bottle forming pressure, j is the number of sampling periods tested, and

is the sum of the actual pressure values of the sample periods tested.

In some embodiments, adjusting the pressure target by taking the average gain value averaged over the remaining sampling periods as the backflow pressure correction value until all sampling periods have been sampled comprises the step of:

obtain the next value P3 of the outlet pressure that has not passed the sampling period, according to the formula:

P3=P1+ΔP/(T1/T0-j),

where ΔP is the gain value, P1 is the target bottle molding pressure, T0 is the time of each of the sampling periods, j is the number of sampling periods tested, T1 is the target blowback molding time, and T1/T0 is the total number of sampling periods contained in the target blow molding time.

In some embodiments, adjusting the pressure target by taking the average gain value averaged over the remaining sampling periods as the backflow pressure correction value until all sampling periods have been sampled comprises the step of:

the time of each of the sampling periods is 1 ms; And

obtain the next value P3 of the outlet pressure that has not passed the sampling period, according to the formula:

P3=P1+ΔP/(T1-j),

where ΔP is the gain value, P1 is the target bottle molding pressure, T0 is the time of each of the sampling periods, j is the number of sampling periods tested, and T1 is the predetermined back blow molding time.

On the other hand, a reverse blow molding system for glass bottles is provided, comprising:

a blowback conduit comprising a first conduit and a second conduit in communication with the air storage device via a T-shaped three-way valve and the primary billet, wherein the first conduit is provided with a controller module configured to control the first conduit to perform the control method described above to supply air into the raw material chamber, while the electrical signal connector on the controller module is connected to the electronic control module through signal lines,

wherein the electronic module is configured to divide the predetermined blowback molding time into a plurality of sampling periods with the same time and set the same target bottle molding pressure for each of the sampling periods; And

the controller module is configured to calculate the error P0 of the air pressure value in accordance with the value of the difference between the target pressure value P1 and the actual pressure value P2 obtained in the sampling period, according to the formula: P0=P1-P2, each time the sampling is completed, calculating the value gain according to the sum of the air pressure value errors over the sampled periods tested, and adjusting the target pressure value by taking the average value of the gain value averaged over the remaining sampling periods as the backflow pressure correction value until all sampling periods are completed.

In some embodiments, the controller module is configured to calculate a gain value in accordance with the sum of the air pressure errors over the sample periods tested, including:

obtaining the value of ΔР gain by the formula:

- сумму фактических значений давления испытанных периодов выборки.where P1 is the target bottle forming pressure, j is the number of sampling periods tested, and

- the sum of the actual pressure values of the tested sampling periods.

In some embodiments, the controller module is configured to adjust the target pressure value by taking the average gain value averaged over the remaining sampling periods as the backflow pressure correction value until all sampling periods have been completed, including :

obtaining the next value P3 of the outlet pressure that has not passed the sampling period, according to the formula:

P3=P1+ΔP/(T1/T0-j),

where ΔP is the gain value, P1 is the target bottle molding pressure, T0 is the time of each of the sampling periods, j is the number of sampling periods tested, T1 is the target blowback molding time, and T1/T0 is the total number of sampling periods contained in the target blow molding time.

The beneficial effects of the technical solution presented in this application are as follows:

(1) The air pressure value of the blowback pipe is constantly adjusted in real time, so that the air pressure value of the blowback pipe gradually approaches the target air pressure value to ensure the stability of blowback molding.

(2) The air pressure value is corrected by calculation, and the total accumulated errors are evenly divided by the subsequent remaining time, so that there will not be large changes in air pressure in the pipeline due to air pressure correction in a short period of time.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to better illustrate the technical solution in the embodiments of the present application, the following is a summary of the drawings necessary to describe the embodiments, and it is obvious that the drawings in the following description are part of the embodiments of the present application, for those skilled in the art, other drawings can also be obtained from based on these drawings without any inventive effort.

Fig. 1 is a flowchart of a control method for a blow molding system according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a blow molding system according to an embodiment of the present application.

On the figures:

1 - electronic control module;

2 - controller module;

21 - electrical signal connector;

22 - signal line;

3 - reverse blowing pipeline;

4 - primary preparation.

IMPLEMENTATION OF THE INVENTION

In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by a person skilled in the art without inventive effort should fall within the protection scope of this application.

In the first aspect, as shown in FIG. 1, a method for controlling a blowback blowing system is provided, including the following steps.

S1. The predetermined back blow molding time is divided into a plurality of sampling periods with the same time, and the same target bottle molding pressure is set for each of the sampling periods.

Specifically, with the electronic control module of the blowback molding system, the pressure target is set to P1 every 1 ms, the sampling period is set to T0 ms, and the blow molding time is set to T1 ms, and the sampling period is not longer than the blow molding time.

It should be noted that the blow molding time refers to the time taken to blow mold the glass bottle. At the start of blowback, samples are continuously and periodically taken from the blowback pipeline, and the sampling period is the time taken for each sampling. The pressure target value P1 refers to the pressure value to be transmitted in each unit of time in order to achieve the expected glass bottle molding effect. In other words, the product of the target pressure value P1 and the blow molding time T1 ms is the target value of the total pressure required to mold each glass bottle. However, since the blowback system cannot deliver compressed air according to the set target value, the actual pressure value differs from the set pressure value to a certain extent. The technical solution of the present invention is aimed at reducing such errors and discrepancies.

Preferably, the unit of time is generally taken to be 1 ms, and the sampling period time can be set to 1 ms.

S2. After the completion of the sampling, the error of the air pressure value is calculated according to the value of the difference between the actual pressure value obtained in the sampling period and the target pressure value each time.

It should be noted that, as described above, the actual value P2 of the outlet pressure in the back blowing pipeline is basically different from the set target pressure value P1.

In particular, the error Р0 of the air pressure value is obtained during the sampling period by the formula:

P0=P1-P2,

where P1 is the target pressure value for bottle molding, P2 is the actual pressure value obtained during the sampling period.

S3. The gain value is calculated according to the sum of the air pressure errors over the sample periods tested.

The value of ΔP amplification is obtained by the formula:

- сумма погрешностей значений давления воздуха за испытанные периоды выборки,

- сумму различных фактических значений Р2 давления, полученных за все упомянутые выше испытанные периоды выборки.where P1 is the target pressure for bottle molding, j is the number of sampling periods tested,

is the sum of the air pressure errors for the sampling periods tested,

- the sum of the various actual pressure values P2 obtained over all the sampling periods mentioned above.

It can be understood that the gain ΔP value is a variable accumulated value because the blowback system starts sampling from the start of the reverse blowout, and the gain ΔP value changes according to the actual pressure in the blowback pipe after each of the sampling periods is completed. The gain ΔP value is the sum of the air pressure error values obtained over all sample periods tested.

S4. The pressure target is adjusted by taking the average gain value averaged over the remaining sampling periods as the correction value until all sampling periods have been sampled.

Specifically, the next outlet pressure value P3 that has not passed the sampling period is obtained according to the formula:

P3=P1+ΔP/(T1/T0-j),

where ΔP is the gain value, P1 is the target pressure for bottle molding, T0 is the time of each of the sampling periods, j is the number of sampling periods tested, T1 is the target blowback molding time, T1/T0 is the total number of sampling periods contained throughout the back blow molding time.

The above operations are repeated until the blowback molding time T1 has elapsed and the blowback conveyance is stopped.

It should be noted that when setting the normal air pressure value, the gain value of this sampling period will be directly added to the next sampling period at the end of this sampling period, that is, after each of the sampling periods, the error of the previous sampling period will be directly added to the next sampling period, resulting in to a large change in the air pressure in the blowback pipe in a short period of time, and will adversely affect the blowback pipe and molding of the preform. Therefore, another method is adopted in the technical solution of the present invention. As shown in the P3 calculation formula above, the accumulated gain ΔP value will be recalculated every time the sampling period error is obtained, and the gain ΔP value will be evenly distributed to the subsequent air pressure value in each unit of transportation time. (T1/T0-j) is the number of sampling periods that were not tested during the entire blowback time T1.

The tuning process described above is a continuous fine tuning process. That is, when each of the sampling periods is completed, the system outlet pressure setting value will be adjusted according to P3, but the outlet pressure setting value P3 is neither the target pressure value P1 nor the actual pipeline pressure value P2. The system continuously distributes the accumulated gain value ΔP to each subsequent remaining unit of time, so that the actual pressure value P3 per unit time is constantly approaching the target pressure value P1. At the same time, since the air pressure fluctuations are evenly distributed in each subsequent unit of time, the air pressure value in the blowback pipe will not fluctuate greatly in a short period of time, resulting in less adverse effects.

The present invention further provides a preferred embodiment of the control method, namely:

The molding pressure target is set to P1, the sampling period is set to 1 ms, and the blowback molding time is set to T1. That is, the sampling period is set to one time to simplify the calculation process.

The back blowing conveyance is started, and the actual pressure value P2 every 1 ms in the back blow molding system is measured in real time.

The value of ΔP amplification is obtained by the formula:

- сумма измеренных значений Р2 реального давления за каждую 1 мс (т.е. в течение периода выборки) за j периодов выборки.The gain value ΔP is the sum of the air pressure errors of the blow molding system over j sampling periods, where j is the number of sampling periods of the blow molding system tested from the start of air blowing transportation,

- the sum of the measured values P2 real pressure for every 1 ms (ie during the sampling period) for j sampling periods.

Then the value P3 of the outlet pressure setting per unit time in the blow molding system is obtained by the formula:

P3=P1+ΔP/(T1-j).

The above operations are repeated until the sampling period T1 ends, after which the blowback conveyance is stopped.

As shown in FIG. 2, the present invention further provides a blow molding system comprising:

an electronic control unit 1 that is configured to divide a predetermined blowback molding time into a plurality of sampling periods with the same time, and set the same target bottle molding pressure value for each of the sampling periods; And

the controller module 2, which is configured to calculate the air pressure value error according to the difference value between the actual pressure value obtained in the sampling period and the target pressure value each time the sampling is completed, calculating the gain value according to the sum of the air pressure value errors over the sample periods tested and adjusting the target pressure value by taking the average value of the gain value averaged over the remaining sample periods as the correction value until all sample periods have been sampled.

The system further comprises a blowback pipeline 3 which includes a first pipeline and a second pipeline. The first pipeline is equipped with a controller module, and the second pipeline is equipped with a manual pressure reducing valve. Both the first pipeline and the second pipeline communicate with the air storage device via a T-shaped three-way valve. Both the first pipeline and the second pipeline are in communication with the primary billet.

It should be noted that the first pipeline is controlled by the controller module to perform the above-described control method for supplying air to the primary chamber. When the first pipeline is unavailable due to an alarm, the second pipeline can be activated by means of an emergency switching of a three-way T-type valve. The second pipeline is a conventional pipeline with manual blowing as a backup device.

It is understood that the electrical signal connector 21 on the controller module 2 is connected to the electronic control module 1 via signal lines 22. Then, the controller module 2 blows air into the primary preform 4 in the preform chamber via the blowback pipe 3.

In summary, the benefits provided by the technical solution presented in this application include: different types of glass pipes or other molded articles can be processed by adjusting the back blow molding time and setting the target value of the system. At the same time, by measuring the actual pressure value P2 and the target pressure value P1 of the back blow pipe, the outlet setting value P3 in the back blow pipe is constantly adjusted, which solves the problem of a large difference between the actual pressure value and the target pressure value in the back blow pipe. In addition, the control method in this solution evenly distributes the calculated pressure errors to the subsequent outlet pressure, and constantly changes the distributed pressure value by sampling, so that the actual pressure value in the back blow pipeline is constantly close to the target pressure value P1, and there will be no negative effect of a large change air pressure on blow molding after one sampling.

In the description of the present application, it should be noted that the orientation or relative position indicated by the terms "upper", "lower", etc., are based on the orientation or relative position shown in the drawings, which are intended only for the convenience of describing the present application and simplifying the description. , instead of indicating or implying that the specified device or element must have a certain orientation, be able to work in a certain orientation, therefore this should not be understood as a limitation of the present application. Unless otherwise expressly indicated and limited, the terms "installation", "connected" and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or a permanent connection; optionally there may be a mechanical connection or an electrical connection; then there may be a direct connection, or an indirect connection through an intermediate medium, or there may be an internal connection between two components. For those skilled in the art, the specific meanings of the aforementioned terms in this application may be understood in accordance with specific circumstances. Additionally, there may be a mechanical connection or an electrical connection; then there may be a direct connection, or an indirect connection through an intermediate medium, or there may be an internal connection between two components. For those skilled in the art, the specific meanings of the aforementioned terms in this application may be understood in accordance with specific circumstances.

It should be noted that relative terms such as "first" and "second" are only intended to distinguish one entity or operation from another entity or operation in this application and do not necessarily require or imply any such actual relationship or order between those entities. or operations. In addition, the terms "comprise", "comprise", or any other variations thereof are intended to cover non-exclusive inclusion such that a process, method, article, or apparatus containing a number of elements not only contains those elements, but also contains those elements that are explicitly not listed, or additionally contain elements inherent in the process, method, product or device. If there are no more restrictions, the elements defined by the sentence "comprising..." do not exclude the existence of other such elements in the process, method, article or device containing the elements.

The above description is only embodiments of the present application, so that those skilled in the art may understand or practice the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Thus, the present application will not be limited to the embodiments shown in this document, but will have the broadest scope consistent with the principles and new features claimed therein.

Claims (26)

1. A control method for a glass bottle back blow molding system, comprising the steps of: dividing the predetermined back blow molding time into a plurality of sampling periods, and setting the same target bottle molding pressure P1 for each of the sampling periods; after starting the bottle blowing process, measuring the actual value of the pressure P2 in the blowing back pipe in real time; calculating an air pressure value error according to a difference value between the target pressure value and the actual pressure value obtained in the sampling period, according to the formula: P0=P1-P2, each time the sampling is completed; calculating a gain value according to the sum of the errors in the air pressure value over the tested sampling periods; And correcting the target pressure value by taking the average gain value averaged over the remaining sampling periods as the backflow pressure correction value until the sampling of all sampling periods is completed. 2. The control method of claim 1, wherein calculating the gain value according to the sum of the errors in the air pressure value over the sample periods tested comprises the step of: get the value of ΔР gain by the formula:

where P1 is the target bottle forming pressure, j is the number of sampling periods tested, and

is the sum of the actual pressure values of the sample periods tested. 3. The control method according to claim 1, wherein correcting the target pressure value by taking the average gain value averaged over the remaining sampling periods as the backflow pressure correction value until sampling of all sampling periods is completed comprises the step of: obtain the next value P3 of the outlet pressure that has not passed the sampling period, according to the formula: P3=P1+ΔP/(T1/T0-j), where ΔP is the gain value, P1 is the target bottle molding pressure, T0 is the time of each of the sampling periods, j is the number of sampling periods tested, T1 is the target blowback molding time, and T1/T0 is the total number of sampling periods contained in the target blow molding time. 4. The control method according to claim 3, wherein the time of each of the sampling periods is 1 ms. 5. A back blowing glass bottle molding system, comprising: a back blowing pipeline comprising a first pipeline and a second pipeline communicating with an air storage device through a T-shaped three-way valve and a primary billet, the first pipeline is provided with a controller module configured to control the first a pipeline for performing the control method according to claim 1 for supplying air to the primary blank chamber, while the electrical signal connector on the controller module is connected to the electronic control module via signal lines, wherein the electronic module is configured to divide the predetermined blowback molding time into a plurality of sampling periods with the same time and set the same target bottle molding pressure for each of the sampling periods; And the controller module is configured to calculate the error P0 of the air pressure value in accordance with the value of the difference between the target pressure value P1 and the actual pressure value P2 obtained in the sampling period, according to the formula: P0=P1-P2, each time the sampling is completed, calculating the value gain according to the sum of the errors in the air pressure value over the sampled periods tested, and adjusting the target pressure value by taking the average value of the gain value averaged over the remaining sampling periods as the backflow pressure correction value until the sample all sample periods. 6. The system of claim. 5, in which the controller module is configured to calculate the gain value in accordance with the sum of the errors in the air pressure value for the tested sampling periods, including: obtaining the value of ΔР gain by the formula:

where P1 is the target bottle forming pressure, j is the number of sampling periods tested, and

is the sum of the actual pressure values of the sample periods tested. 7. The system of claim 5, wherein the controller module is configured to adjust the target pressure value by taking the average gain value averaged over the remaining sampling periods as the backflow pressure correction value until the sampling is completed. all sampling periods, including: obtaining the next value P3 of the outlet pressure that has not passed the sampling period, according to the formula: P3=P1+ΔP/(T1/T0-j), where ΔP is the gain value, P1 is the target bottle molding pressure, T0 is the time of each of the sampling periods, j is the number of sampling periods tested, T1 is the target blowback molding time, and T1/T0 is the total number of sampling periods contained in the target blow molding time.

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