CN217249892U - Feeding system - Google Patents

Abstract

The utility model relates to a feeding system, which comprises a first feeding device and a second feeding device; and the control device is used for controlling the material flow provided by the first feeding device to the second feeding device according to the difference value between the actual liquid level and the target liquid level in the second feeding device so as to maintain the target liquid level in the second feeding device. In this application controlling means can obtain the difference between actual liquid level and the target liquid level in the second feedway in real time, controlling means is according to this difference, the material flow that first feedway of control provided to the second feedway makes and maintains the target liquid level in the second feedway all the time, from this, make spraying device in the spraying process, the material pressure and the flow that follow second feedway and carry remain stable, make the spraying process more stable, the covering effect of coating remains stable.

Description

Feeding system

Technical Field

The utility model relates to a LED display screen technical field especially relates to a feeding system.

Background

Compared with an LCD display screen, the LED display screen has the advantages of high contrast and real color reduction degree while achieving good image fineness, long service life, low power consumption and capability of realizing unlimited assembly in size. In recent years, with the development and update of the LED display technology, the LED display screen is more and more widely applied, and the product is developed from the small-pitch LED to the finer Mini LED and Micro LED.

The LED display screen is formed by splicing a plurality of display modules, and after the LED display screen is spliced, a layer of coating needs to be sprayed on the surface of the LED display screen to achieve a better display effect of the LED display screen. However, in the prior art, due to the limitation of the feeding device, when the large-area coating is sprayed, the coating in the feeding device is gradually reduced, the covering effect of the coating on the display module is different, so that the gradual change color appears on different display modules, and the display effect of the assembled LED display screen is influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a feeding system for different display modules, which is prone to have a gradual color change when the coating is sprayed.

A feed system comprising:

the spraying device comprises a first feeding device and a second feeding device which are used for containing materials and are communicated with each other, wherein the first feeding device is used for providing the materials for the second feeding device, and the second feeding device is communicated with an external spraying device so as to supply the materials for the spraying device; and

and the control device is used for controlling the material flow provided by the first feeding device to the second feeding device according to the difference value between the actual liquid level and the target liquid level in the second feeding device so as to maintain the target liquid level in the second feeding device.

In some embodiments, the control device comprises a first control valve and a controller which are connected in a communication manner, the first feeding device is communicated with the second feeding device through a connecting pipeline, and the first control valve is arranged on the connecting pipeline and can open or close the connecting pipeline under the control of the controller.

In some embodiments, the first feed device has a volume greater than the volume of the second feed device.

In some embodiments, the first feeding device comprises a first stirring mechanism for stirring the material inside the first feeding device; and/or

The second feeding device comprises a second stirring mechanism, and the second stirring mechanism is used for stirring the materials in the second feeding device.

In some embodiments, when the first supply device comprises the first stirring mechanism and the second supply device comprises the second stirring mechanism, the stirring speed of the first stirring mechanism is the same as that of the second stirring mechanism.

In some embodiments, when the first feeding device includes the first stirring mechanism, the first feeding device includes a first feeding barrel having a first opening and a first top cover covering the first opening, and the first stirring mechanism is fixed on the first top cover and extends into the first feeding barrel.

In some embodiments, when the second feeding device includes the second stirring mechanism, the second feeding device includes a second feeding barrel having a second opening and a second top cover covering the second opening, and the second stirring mechanism is fixed on the second top cover and extends into the second feeding barrel.

In some embodiments, the first feeding device and the second feeding device are connected through a connecting pipe, the second top cover is provided with a feeding hole, and the connecting pipe extends into the second feeding barrel from the feeding hole.

In some embodiments, the feed system comprises a vacuum pump connected to the second feed device for evacuating the interior of the second feed device.

In some embodiments, the supply system further includes an air source, a second control valve, and an air inlet pipe connected between the air source and the first supply device, the second control valve is disposed on the air inlet pipe and used for opening or closing the air inlet pipe, and the air source is used for introducing compressed air into the first supply device.

Above-mentioned feeding system, controlling means can be according to the difference between actual liquid level and the target liquid level in the second feedway, and the material flow that first feedway provided to the second feedway is controlled to the second feedway, makes and maintains the target liquid level in the second feedway all the time, from this for spraying device is at the spraying in-process, and the material pressure and the flow that follow the second feedway and carry remain stable, make the spraying process more stable, and the covering effect of coating remains stable.

Drawings

FIG. 1 is a schematic view of an overall structure of a first feeding device according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of an overall structure of a second feeding device according to an embodiment of the present application;

FIG. 3 is a schematic plan view of the second feeding device shown in FIG. 2;

in the figure: 100. a feed system; 10. a first feeding device; 20. a second feeding device; 40. connecting a pipeline; 11. a first stirring mechanism; 12. a first supply barrel; 13. a first top cover; 21. a second stirring mechanism; 22. a second feed barrel; 23. a second top cover; 31. a first control valve; 111. a first drive motor; 112. a first stirring paddle; 121. a first opening; 211. a second drive motor; 212. a second stirring paddle; 221. a second opening.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

With the wider application of the LED display screen, people have higher and higher requirements on the use performance of the LED display screen. Since the application scenes of the LED display screen are various, the LED display screen should have different area sizes in order to adapt to different application scenes.

At present, in order to flexibly control the size of an LED display screen, the LED display screen is formed by splicing a plurality of display modules. And because all can have the difference in PCB base plate colour, LED lamp dress uniformity, leg plumpness, the epoxy encapsulation plumpness between the different display module assemblies, consequently can have the ink color difference between the different display module assemblies. When a plurality of display modules are spliced into a large screen, obvious modular color difference occurs, and the problem of inconsistent ink color is a big pain point in the current LED display industry.

In order to solve the problem of ink color difference between different display modules, the conventional method in the industry is to spray a layer of coating on the surface of the display module to cover the bottom color difference between different display modules, so that the ink color of the whole LED display screen is consistent.

However, at present, after a large amount of spraying is performed, the ink colors among different display modules gradually change, so that after the box body or the large screen is assembled, the colors gradually become lighter or darker in space.

Based on the above problems, the inventor has found through intensive research that the main reason for the above problems is that the existing feeding device generally uses a spraying medicine water barrel mode, and both a pressure barrel and a pump body extraction type barrel are charged once before spraying in the using process. Thus, during a batch spray process, the coating is gradually reduced in the barrel and the level of the coating is gradually reduced, resulting in a gradual reduction in the pressure and flow of the spray. And for the LED display screen, the used coating and the display module to be sprayed are dark colors or even black, so that the covering effect of the coating on the display module has larger influence on color display, namely, the range of the color difference value which can be distinguished by naked eyes is smaller. Therefore, in the spraying process, the spraying pressure and the flow are gradually reduced, so that the gradual color effect is achieved.

Based on the above consideration, the inventor researches and discovers that the liquid level of the coating in the feeding device can be kept stable by designing the structure of two feeding devices connected with each other, wherein one feeding device is used as a transfer structure of the coating, so that the pressure and the flow rate of the coating output from the feeding device are kept stable. In addition, the other feeding device continuously feeds the coating into the feeding device so as to ensure that the liquid level in the feeding device is stable. Therefore, the pressure and the flow rate of the sprayed coating can be kept stable. Through this kind of structure, can improve the stability of coating spraying from the source, solve the problem of gradual change colour.

Referring to fig. 1, 2 and 3, an embodiment of the present invention provides a feeding system 100, which includes a first feeding device 10, a second feeding device 20 and a control device. The first feeding device 10 and the second feeding device 20 are used for containing materials and are communicated with each other. The control device is used for controlling the material flow rate provided by the first feeding device 10 to the second feeding device 20 according to the difference value between the actual liquid level and the target liquid level in the second feeding device 20, so that the target liquid level is maintained in the second feeding device 20.

Specifically, the coating material to be sprayed is contained in the first supply device 10 and the second supply device 20. The level of the dope in the second feed device 20 in the initial state is first recorded, and the level is set as a target level. At the start of spraying, the second supply device 20 supplies the spraying device so that the liquid level in the second supply device 20 starts to drop.

In the above process, the control device can monitor the actual liquid level in the second feeding device 20, control the first feeding device 10 to feed the second feeding device 20 according to the difference value, and control the flow rate of the supplied materials. When the actual liquid level in the second feeding device 20 reaches the same level as the target liquid level, the control device controls the first feeding device 10 to stop feeding the second feeding device 20. Through the above process, it is ensured that the actual liquid level in the second feeding device 20 is always maintained at the target liquid level, thereby keeping the liquid level stable.

From this, when coating was exported from second feedway 20, its pressure all kept stable with the flow for the coating of spraying to display module assembly is more even, avoids appearing gradual change colour.

In order to make the paint flow from the first supply device 10 into the second supply device 20 more smooth, the supply system 100 further includes a gas source (not shown), a second control valve (not shown), and an air inlet pipe (not shown) connected between the gas source and the first supply device 10. The air source is used for introducing compressed air into the first feeding device 10, and the second control valve is arranged on the air inlet pipeline and used for opening or closing the air inlet pipeline. When compressed air is introduced into the first feeding device 10, the materials in the first feeding device 10 can be promoted to flow to the second feeding device 20, and the feeding efficiency is improved.

In some embodiments, the control device includes a first control valve 31 and a controller (not shown) in communication with each other. The first feeding device 10 and the second feeding device 20 are communicated through a connecting pipe 40, and the first control valve 31 is disposed on the connecting pipe 40 and can open or close the connecting pipe 40 under the control of the controller. The first control valve 31 is used for opening or closing the connecting pipeline 40, and the controller is used for receiving the difference value between the actual liquid level and the target liquid level obtained by the liquid level sensor and controlling the first control valve 31 to be opened or closed.

When the difference received by the controller is greater than zero, it is an indication that the actual liquid level within the second feed device 20 is below the target level. At this time, the controller controls the first control valve 31 to be opened, thereby allowing the first feed device 10 to supply the material into the second feed device 20. When the difference received by the controller is equal to zero, it is indicated that the actual liquid level in the second feed device 20 is equal to the target liquid level. At this time, the controller controls the first control valve 31 to be closed, so that the first material supplying device 10 stops supplying the material into the second material supplying device 20.

In some embodiments, the volume of the first feed device 10 is greater than the volume of the second feed device 20. Specifically, since the first supply device 10 is used to supply the coating material, the second supply device 20 is used to maintain a stable pressure and flow rate of the sprayed coating material. Thus, the volume of the second supply device 20 need not be so large, as long as the level of the internal coating material is maintained constant and the coating material is delivered to the spray device. The first feeding device 10 needs to continuously feed into the second feeding device 20 to maintain the liquid level in the second feeding device 20 stable, so the volume of the first feeding device 10 needs to be larger than that of the second feeding device 20. Therefore, the first feeding device 10 can continuously feed materials into the second feeding device 20, and smooth and efficient completion of the spraying process is ensured.

In some embodiments, the first feeding device 10 comprises a first stirring mechanism 11, and the first stirring mechanism 11 is used for stirring the material inside the first feeding device 10. And/or the second feeding device 20 comprises a second stirring mechanism 21, and the second stirring mechanism 21 is used for stirring the materials in the second feeding device 20.

Specifically, in the present embodiment, the first feeding device 10 includes a first stirring mechanism 11, the second feeding device 20 includes a second stirring mechanism 21, and the first stirring mechanism 11 and the second stirring mechanism 21 respectively stir the materials inside the first feeding device 10 and the second feeding device 20.

It should be noted that the coating material sprayed on the display module contains a large amount of particulate matter, and the content and distribution density of the particulate matter in the coating material will determine the display performance of the coating material. The display performance is high when the content of the particulate matter is large, and the display performance is low when the content of the particulate matter is small.

Therefore, in order to make the distribution of the particulate matter in the paint more uniform, the paint in the first and second feeding devices 10 and 20 is stirred by the first and second stirring mechanisms 11 and 21, respectively, so that the distribution of the discharged paint on the display module is more uniform.

It will be appreciated that in some other embodiments, the stirring mechanism may be provided only in the second feeding device 20, that is, the paint in the second feeding device 20 is stirred uniformly. Because second feedway 20 directly communicates with the spraying device, its inside coating directly is used for the spraying to the display module assembly on, consequently, stirs the coating in the second feedway 20 and can ensure that the coating of spraying to the display module assembly is more even.

Further, when the first feeding device 10 includes the first stirring mechanism 11 and the second feeding device 20 includes the second stirring mechanism 21, the stirring speeds of the first stirring mechanism 11 and the second stirring mechanism 21 are the same. The first stirring mechanism 11 and the second stirring mechanism 21 respectively stir the coatings in the first feeding device 10 and the second feeding device 20 synchronously, so that the uniformity of the coatings in the first feeding device 10 and the second feeding device 20 can be kept consistent, and the uniformity of the coatings on the display module is further improved.

In some embodiments, when the first feeding device 10 includes the first stirring mechanism 11, the first feeding device 10 includes a first feeding barrel 12 having a first opening 121 and a first cover 13 covering the first opening 121. The first stirring mechanism 11 is fixed on the first top cover 13 and extends into the first feeding barrel 12.

The first top lid 13 is used to tightly cover the first supply bucket 12, thereby reducing volatilization of the paint inside the first supply bucket 12 and reducing the possibility of contamination of the paint by the external environment.

In addition, the first top cover 13 and the first feeding barrel 12 are matched with each other, so that the structure of the first feeding device 10 is more flexible, and feeding into the first feeding device 10 is facilitated. And fix first rabbling mechanism 11 on first top cap 13, when first top cap 13 was opened, first rabbling mechanism 11 thereupon left first feed bucket 12, and when first top cap 13 was closed, first rabbling mechanism 11 thereupon stretches into in first feed bucket 12. Therefore, the coating material can be conveniently added into the first material supplying barrel 12, so that the whole structure of the first material supplying device 10 is simpler and the operation is easy.

When the second feeding device 20 includes the second stirring mechanism 21, the second feeding device 20 includes a second feeding barrel 22 having a second opening 221 and a second top cover 23 covering the second opening 221. The second stirring mechanism 21 is fixed on the second top cover 23 and extends into the second feeding barrel 22.

The second top cover 23 is used to tightly cover the second supply bucket 22, thereby reducing volatilization of the paint inside the second supply bucket 22 and reducing the possibility of contamination of the paint by the external environment.

Similarly, the cooperation of the second top cover 23 and the second feeding barrel 22 can make the structure of the second feeding device 20 more flexible, and facilitate feeding into the second feeding device 20. In addition, the second stirring mechanism 21 is fixedly disposed on the second top cover 23, and when the second top cover 23 is opened, the second stirring mechanism 21 is separated from the second feeding barrel 22. When the second top cover 23 is closed, the second stirring mechanism 21 is inserted into the second feeding barrel 22. Therefore, the coating material can be conveniently added into the second feeding barrel 22, so that the whole structure of the second feeding device 20 is simpler and the operation is easy.

It should be noted that the first stirring mechanism 11 includes a first driving motor 111 and a first stirring paddle 112, and the first driving motor 111 is disposed on the first top cover 13 and is used for driving the first stirring paddle 112 to rotate. The first paddle 112 extends into the first supply barrel 12 to agitate the paint therein.

Similarly, the second stirring mechanism 21 includes a second driving motor 211 and a second stirring paddle 212, and the second driving motor 211 is disposed on the second top cover 23 and is used for driving the second stirring paddle 212 to rotate. Second paddle 212 extends into second feed barrel 22 to agitate the coating material therein.

In some embodiments, the second top cover 23 is provided with a feeding hole, and the connecting pipe 40 extends into the second feeding barrel 22 from the feeding hole. The connecting pipe 40 extends into the second feeding barrel 22 through the second top cover 23, so that the installation of the second feeding device 20 and the addition of the coating into the second feeding device 20 can be facilitated.

Further, the supply system 100 includes a vacuum pump (not shown) connected to the second supply device 20 for evacuating the interior of the second supply device 20. When the second stirring mechanism 21 stirs the paint in the second feeding device 20, bubbles may be formed in the paint, and at this time, if the paint is sprayed on the display module, a blank area where the paint is not covered is likely to be formed. Therefore, the second supply device 20 is vacuumized by the vacuum pump, so that bubbles generated in the coating are avoided, and the spraying efficiency can be improved.

Further, a vacuum pump may be provided to each of the first supply device 10 and the second supply device 20, and the first supply device 10 and the second supply device 20 may be vacuumized. Thereby, the risk of the coating material generating bubbles can be further reduced.

When the present application is used specifically, a certain amount of paint is first added into first supply bucket 12 and second supply bucket 22, respectively, and the paint liquid level in second supply bucket 22 is located at two thirds of the position of the bucket body, and this liquid level is the target liquid level. The first top cover 13 and the second top cover 23 are respectively covered on the first feeding barrel 12 and the second feeding barrel 22, the first stirring paddle 112 is controlled to rotate by the first driving motor 111, the second stirring paddle 212 is controlled to rotate by the second driving motor 211, and the stirring speeds of the first stirring paddle 112 and the second stirring paddle 212 are the same.

After the paint in the first supply barrel 12 and the second supply barrel 22 is uniformly stirred, the paint is conveyed to the spraying device through the second supply device 20, and the paint is sprayed onto the display module. In the process of conveying the coating to the spraying device, the actual liquid level in the second feeding device 20 is continuously reduced, and the control device monitors the actual liquid level in the second feeding device 20 in real time and transmits the difference value between the actual liquid level and the target liquid level to the controller. The controller controls the first control valve 31 to be opened according to the magnitude of the difference and controls the opening time thereof so that the coating material in the first supply device 10 flows into the second supply device 20.

When the difference between the actual liquid level and the target liquid level in the second feed device 20 is zero, the controller closes the first control valve 31 so that the first feed device 10 stops feeding the second feed device 20. Thereby, it is ensured that the liquid level in the second feeding device 20 is always kept stable.

The feed system 100 of the above embodiment has at least the following advantages:

1) the first feeding device 10 feeds materials into the second feeding device 20, and the liquid level of the coating materials in the second feeding device 20 is kept stable, so that when the second feeding device 20 conveys the coating materials to the spraying device and the coating materials are sprayed on the display module, the flow and the pressure of the sprayed coating materials are kept stable, and the uniformity of the coating materials on the display module can be improved;

2) the first stirring mechanism 11 and the second stirring mechanism 21 respectively and synchronously stir the coatings in the first feeding barrel 12 and the second feeding barrel 22, so that the coatings are more uniform, the coatings sprayed on the display module are more uniform, and the spraying effect is improved;

3) the vacuum pump carries out evacuation processing to first feed barrel 12 and second feed barrel 22 inside, can effectively avoid stirring in-process coating inside bubble to improve the homogeneity of blowout coating.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A feed system, comprising:

the spraying device comprises a first feeding device and a second feeding device which are used for containing materials and are communicated with each other, wherein the first feeding device is used for providing the materials for the second feeding device, and the second feeding device is communicated with an external spraying device so as to supply the materials for the spraying device; and

and the control device is used for controlling the material flow rate provided by the first feeding device to the second feeding device according to the difference value between the actual liquid level and the target liquid level in the second feeding device, so that the material in the second feeding device is kept at the target liquid level.

2. The feeding system of claim 1, wherein the control device comprises a first control valve and a controller connected in communication, the first feeding device and the second feeding device are communicated through a connecting pipeline, and the first control valve is arranged on the connecting pipeline and can be controlled by the controller to open or close the connecting pipeline.

3. The feed system of claim 1 wherein said first feed device has a volume greater than a volume of said second feed device.

4. The feeding system of claim 1, wherein the first feeding device comprises a first stirring mechanism for stirring the material inside the first feeding device; and/or

The second feeding device comprises a second stirring mechanism, and the second stirring mechanism is used for stirring the materials in the second feeding device.

5. The feeding system of claim 4 wherein when said first feeding device comprises said first stirring mechanism and said second feeding device comprises said second stirring mechanism, said first stirring mechanism and said second stirring mechanism are at the same stirring speed.

6. The feeding system as claimed in claim 4, wherein when the first feeding device comprises the first stirring mechanism, the first feeding device comprises a first feeding barrel with a first opening and a first top cover covering the first opening, and the first stirring mechanism is fixed on the first top cover and extends into the first feeding barrel.

7. The feeding system of claim 4, wherein when the second feeding device comprises the second stirring mechanism, the second feeding device comprises a second feeding barrel with a second opening and a second top cover covering the second opening, and the second stirring mechanism is fixed on the second top cover and extends into the second feeding barrel.

8. The feeding system of claim 7, wherein the first feeding device is connected with the second feeding device through a connecting pipe, the second top cover is provided with a feeding hole, and the connecting pipe extends into the second feeding barrel from the feeding hole.

9. The feed system of claim 1, comprising a vacuum pump connected to the second feed device for evacuating the interior of the second feed device.

10. The feeding system of claim 1, further comprising an air source, a second control valve, and an air inlet pipe connected between the air source and the first feeding device, wherein the second control valve is disposed on the air inlet pipe and used for opening or closing the air inlet pipe, and the air source is used for introducing compressed air into the first feeding device.

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