CN115569814A - Coating device and coating surface density closed-loop adjusting method thereof - Google Patents
Coating device and coating surface density closed-loop adjusting method thereof Download PDFInfo
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- CN115569814A CN115569814A CN202211324178.2A CN202211324178A CN115569814A CN 115569814 A CN115569814 A CN 115569814A CN 202211324178 A CN202211324178 A CN 202211324178A CN 115569814 A CN115569814 A CN 115569814A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 236
- 238000000576 coating method Methods 0.000 title claims abstract description 236
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 105
- 230000007246 mechanism Effects 0.000 claims abstract description 76
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 238000009826 distribution Methods 0.000 claims abstract description 31
- 230000001105 regulatory effect Effects 0.000 claims abstract description 30
- 230000008859 change Effects 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000009530 blood pressure measurement Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 3
- 238000009827 uniform distribution Methods 0.000 abstract description 2
- 238000007581 slurry coating method Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 38
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0254—Coating heads with slot-shaped outlet
- B05C5/0258—Coating heads with slot-shaped outlet flow controlled, e.g. by a valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
- B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
- B05C11/1005—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material already applied to the surface, e.g. coating thickness, weight or pattern
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- Coating Apparatus (AREA)
Abstract
The application discloses coating device and coating surface density closed-loop adjusting method thereof, and the coating device comprises: the coating die head is internally provided with a coating slit and a slurry distribution cavity, one side of the coating die head is provided with a coating lip, and the other side of the coating die head is provided with a plurality of slurry channels communicated with the slurry distribution cavity; the slurry channels are provided with pressure sensors and flow regulating valves; the first control module responds to a pressure detection signal sent by the pressure sensor to adjust the opening degree of the corresponding flow regulating valve; the coating adjusting mechanisms comprise driving pieces and adjusting blocks which are driven by the driving pieces to extend into the coating slits to change the heights of the coating slits so as to adjust the coating flow. The first control module adjusts the opening of the flow regulating valve according to the pressure signal, so that the slurry has good uniform distribution in the slurry distribution cavity in advance, and finally, the slurry coated on the base material through the coating slit and the coating lip is uniform, and the uniformity of the transverse surface density of the slurry coating is good.
Description
Technical Field
The application relates to the technical field of coating, in particular to a coating device and a coating surface density closed-loop adjusting method thereof.
Background
The working principle of the coating slot extrusion coating is that under a certain pressure and a certain flow rate, slurry enters a cavity of a coating die head from a feed inlet, then enters a coating slot of the coating die head from the cavity, enters a coating lip of the coating die head from the coating slot, and is sprayed out from the coating lip to be transferred onto a substrate. The coating die generally consists of an upper die, a lower die and a shim sandwiched between the upper and lower dies, the height of the shim determining the thickness of the coating.
However, when the coating slurry flows into the chamber from the feed port, the pressure in the longitudinal direction of the chamber is not uniform due to the long chamber, and the coating thickness on the substrate is not uniform.
In order to solve the problem of uneven pressure in the slurry cavity caused by longer cavity, a coating device with multiple feed inlets is designed.
However, the coating device with multiple feed ports still has the following defects:
under the condition that the flow of the slurry at each feed port is not uniform, the slurry entering the cavity is not uniformly distributed, and further the slurry entering the coating slit from the cavity and coating the slurry on the substrate from the coating lip is not uniform, and finally the uniformity of the transverse surface density of the coating is not good.
Therefore, there is a need to design a new coating device to overcome the above-mentioned drawbacks.
Content of application
Therefore, an object of the present invention is to provide a coating apparatus and a closed loop adjustment method for coating surface density thereof, which aim to solve the problem of poor uniformity of the transverse coating surface density of slurry coated on a substrate by the coating apparatus in the prior art.
In order to solve the technical problem, the technical scheme of the application is as follows:
the coating device includes:
the coating die head is internally provided with a coating slit and a slurry distribution cavity communicated with the coating slit, one side of the coating die head is provided with a coating lip for enabling slurry to flow out of the coating slit, and the other side of the coating die head is provided with a plurality of slurry channels communicated with the slurry distribution cavity; each slurry channel is provided with a pressure sensor for detecting the pressure of the slurry in the slurry channel, and each slurry channel is also provided with a flow regulating valve for regulating the feeding flow of the slurry channel;
and the first control module is electrically connected with the plurality of pressure sensors and the plurality of flow regulating valves and responds to pressure detection signals sent by the pressure sensors to regulate the opening degree of the corresponding flow regulating valves.
Further, a detection point of the pressure sensor is located on the slurry passage between the flow rate adjustment valve and the slurry distribution chamber.
Further, the pressure sensor is installed in a threaded pipe in the coating die head.
Further, an elastic collar is arranged between the inner wall of the threaded pipe and the pressure sensor.
Further, the method also comprises the following steps:
the coating adjusting mechanisms comprise driving pieces and adjusting blocks driven by the driving pieces to extend into the coating slits to change the heights of the coating slits so as to adjust the coating flow, and the adjusting blocks are arranged side by side along the length direction of the coating die head;
a plurality of wet film thickness measuring mechanisms which are arranged side by side in the width direction of the substrate coated by the coating lip and are suitable for detecting the thickness of a wet film formed on the substrate coated by the coating lip;
and the second control module is electrically connected with the plurality of wet film thickness measuring mechanisms and the plurality of coating adjusting mechanisms, and responds to a wet film thickness detection signal sent by the wet film thickness measuring mechanisms to adjust the height of the corresponding adjusting block extending into the coating slit.
Furthermore, the coating adjusting mechanism is a T-block adjusting mechanism, the T-block adjusting mechanism comprises a second differential head and a T block fixedly connected with the second differential head through a coupler, the second differential head is in threaded connection with a support, and the support is fixed on the coating die head.
The technical scheme of the application has the following advantages:
1. the application provides a coating device, pressure sensor's pressure signal transmits for first control module, first control module adjusts flow control valve's aperture according to pressure signal, make the thick liquids via each thick liquids passageway get into thick liquids distribution chamber with even flow, so, can let thick liquids realize good evenly distributed nature at thick liquids distribution intracavity in advance, finally make from thick liquids distribution chamber through coating slit and coating lip coating to the thick liquids flow of substrate even, make the homogeneity of the horizontal surface density of thick liquids coating good.
2. The application provides a coating device, still through setting up the wet film thickness detection signal that second control module sent in response to wet film thickness measurement mechanism stretches into the height in the coating slit with the regulating block that adjusts to correspond, and then can further adjust the flow from the coating lip coating to the thick liquids of substrate, make from the coating lip coating even to the thick liquids of substrate, realize the homogeneity of the horizontal surface density of thick liquids coating.
The coating surface density closed-loop adjusting method for the coating device comprises the following steps:
acquiring a pressure detection value on each slurry channel in real time;
judging whether the obtained pressure detection values are all equal to a preset pressure threshold value or not;
and if the judgment result shows that the pressure detection value is not equal to the preset pressure threshold value, adjusting the opening of the corresponding flow regulating valve until the obtained pressure detection value on each slurry channel is equal to the preset pressure threshold value.
Further, if the pressure detection value is not equal to the preset pressure threshold value as a result of the determination, the step of adjusting the opening of the corresponding flow regulating valve includes:
reading the serial number of the corresponding pressure sensor on the slurry channel, recording the pressure measuring times of the pressure sensor with the serial number, and judging whether the absolute difference value of the two adjacent pressure measuring times of the pressure sensor with the serial number is greater than T time;
if the judgment result is that the absolute difference value of the two adjacent pressure measurement times is greater than the T time, eliminating the measurement time point information and the measurement frequency information before the pressure sensor with the serial number;
if the judgment result is that the absolute difference value of the pressure measuring time of two adjacent times is not more than T time, continuously judging whether the pressure measuring times of the pressure sensor with the serial number are more than m times;
if the judgment result is that the pressure measuring times are more than m times, a first alarm signal is sent out;
if the judgment result is that the pressure measuring times are not more than m, comparing the pressure detection value of the pressure sensor with the preset pressure threshold value;
if the judgment result is that the pressure detection value of the pressure sensor of the serial number is larger than the preset pressure threshold value, reducing the flow of the flow regulating valve;
and if the pressure detection value of the pressure sensor with the serial number is smaller than the preset pressure threshold value according to the judgment result, increasing the flow of the flow regulating valve.
Further, if the judgment result is that the pressure detection value is equal to a preset pressure threshold value, acquiring the wet film thickness value detected by each wet film thickness measuring mechanism in real time;
judging whether the thickness values of the plurality of wet films acquired at the same time point are equal to a preset film thickness threshold value or not;
if the judgment result is that the wet film thickness value is equal to the preset film thickness threshold, continuously acquiring the wet film thickness value detected by each wet film thickness measuring mechanism at the next time point;
and if the judgment result shows that the wet film thickness value is not equal to the preset film thickness threshold value, adjusting the height of an adjusting block on the corresponding coating adjusting mechanism extending into the coating slit so as to adjust the coating flow until all the wet film thickness values acquired at the same time point are equal to the preset film thickness threshold value.
Further, if the wet film thickness value is not equal to the preset film thickness threshold value as a result of the determination, the step of adjusting the height of the corresponding adjusting block on the coating adjusting mechanism extending into the coating slit includes:
reading the serial number of the corresponding wet film thickness measuring mechanism, recording the thickness measuring times of the wet film thickness measuring mechanism of the serial number, and judging whether the absolute difference value of the two adjacent thickness measuring times of the wet film thickness measuring mechanism of the serial number is greater than t time or not;
if the judgment result is that the absolute difference value of the two adjacent thickness measuring times is greater than t time, removing the thickness measuring time point information and the thickness measuring time information before the wet film thickness measuring mechanism with the serial number;
if the judgment result is that the absolute difference value of the two adjacent thickness measuring times is not more than t time, continuously judging whether the thickness measuring times of the wet film thickness measuring mechanism with the serial number are more than n times;
if the judgment result is that the thickness measuring times are more than n times, a second alarm signal is sent out;
if the judgment result shows that the thickness measuring times are not more than n times, comparing the wet film thickness value of the wet film thickness measuring mechanism with the preset film thickness threshold value of the serial number;
if the judgment result is that the wet film thickness value of the wet film thickness measuring mechanism with the serial number is larger than the preset film thickness threshold value, the height of the adjusting block on the corresponding coating adjusting mechanism extending into the coating slit is increased so as to reduce the coating flow;
and if the wet film thickness value of the wet film thickness measuring mechanism with the sequence number is smaller than the preset film thickness threshold value, reducing the height of the corresponding adjusting block on the coating adjusting mechanism extending into the coating slit so as to increase the coating flow.
1. The application provides a coating surface density closed-loop regulation method, pressure sensor can carry out real-time detection to the pressure value in each thick liquids passageway, the pressure detection value in which thick liquids passageway is not conform to preset pressure threshold value, just adjust the aperture of the flow control valve that corresponds, adjust the thick liquids flow that gets into in the thick liquids passageway in time, the thick liquids flow that makes in every thick liquids passageway is unanimous with the thick liquids flow in other thick liquids passageways, so, can let the thick liquids realize good evenly distributed nature in thick liquids distribution intracavity in advance, finally make from thick liquids distribution chamber via coating slit and coating lip coating even to the thick liquids flow of substrate, let the homogeneity of the horizontal surface density of coating good.
2. According to the closed-loop adjustment method for the coating surface density, the height of the adjusting block of the corresponding coating adjusting mechanism extending into the coating slit is adjusted according to the wet film thickness value measured by the wet film thickness measuring mechanism, the uniformity of the slurry coated on the base material from the coating slit through the coating lip is further improved, and the uniformity of the slurry coated on the transverse surface density is finally realized.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic perspective view of a coating apparatus of the present application;
FIG. 2 is a schematic cross-sectional view of a coating apparatus of the present application;
FIG. 3 is a schematic cross-sectional view of a throttle valve in the present application;
FIG. 4 is an enlarged view taken at A in FIG. 2;
FIG. 5 is a flow chart of the closed-loop adjusting method for coating surface density of the coating device according to the present application, wherein the flow of the flow adjusting valve is adjusted according to the detection signal of the pressure sensor;
fig. 6 is a flowchart of adjusting the coating flow rate according to the detection signal of the wet film thickness measuring mechanism in the closed-loop coating surface density adjusting method of the coating apparatus of the present application.
Description of reference numerals:
1. a throttle valve; 11. an upper valve body; 12. a lower valve body; 13. a slurry chamber; 14. a first differential head; 15. a valve core; 16. a feed inlet; 17. a discharge port; 2. a coating die head; 21. an upper die head; 22. a lower die head; 23. a slurry distribution chamber; 24. a slurry passage; 25. coating a slit; 26. coating the lip; 27. a threaded pipe; 28. a cover plate; 29. an elastic collar; 3. a pressure sensor; 4. a T-block adjusting mechanism; 41. a second differential head; 42. a coupling; 43. t block; 44. a support; 5. a shunt tank.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1 to 4, the present embodiment provides a coating apparatus including a plurality of flow rate adjustment valves, a coating die 2, a plurality of pressure sensors 3, and a first control module (not shown).
The coating die head 2 is internally provided with a coating slit 25 and a slurry distribution cavity 23 communicated with the coating slit 25, one side of the coating die head 2 is provided with a coating lip 26 for the slurry to flow out of the coating slit 25, and the other side of the coating die head 2 is provided with a plurality of slurry channels 24 communicated with the slurry distribution cavity 23.
In the present embodiment, the coating die 2 includes an upper die 21 and a lower die 22 which are oppositely disposed, and the coating slit 25 is located between the upper die 21 and the lower die 22, specifically, the coating slit 25 is enclosed by the upper die 21, the lower die 22 and a gasket (not labeled) sandwiched between the upper die 21 and the lower die 22, the gasket is opened toward the coating lip 26, and the slurry distribution chamber 23 is disposed in the lower die 22. In addition, in the present embodiment, the number of the coating lip 26 and the number of the slurry distribution cavities 23 are one, one slurry distribution cavity 23 is communicated with the plurality of slurry channels 24, and the slurry enters the slurry distribution cavity 23 through the plurality of slurry channels 24 and then is coated on the substrate from the coating slit 25 through the coating lip 26.
Each slurry channel 24 is provided with a pressure sensor 3 for detecting the pressure of the slurry in the slurry channel 24, and each slurry channel 24 is also provided with a flow regulating valve for regulating the flow of the slurry in the slurry channel 24. In this embodiment, the flow regulating valve is a throttle valve 1, and the detection point of the pressure sensor 3 is located on the slurry passage 24 between the flow regulating valve and the slurry distribution chamber 23.
Specifically, the throttle valve 1 includes an upper valve body 11 and a lower valve body 12 which are oppositely arranged, the upper valve body 11 and the lower valve body 12 are oppositely arranged and are fixedly connected through a bolt, a first differential head 14 of the throttle valve 1 is in threaded connection with the upper valve body 11, a valve core 15 of the throttle valve 1 is fixedly connected with the first differential head 14 through a first connecting piece (not marked), a feed port 16 of the throttle valve 1 and a discharge port 17 of the throttle valve 1 are also arranged in the lower valve body 12, the discharge ports 17 and the feed port 16 are arranged in a one-to-one correspondence, the feed port 16 is located below the slurry cavity 13 relative to the discharge port 17, the feed port 16 includes a horizontal section and a vertical section, the tail end of the vertical section is horn-shaped and expands towards the slurry cavity 13, the valve core 15 is located at the joint of the feed port 16 and the slurry cavity 13, the shape of the valve core 15 is matched with that of the feed port 16, that is, under the view angle of fig. 2, the valve core 15 is large in the upper part and small in the lower part. A gap is formed between the outer wall of the valve core 15 and the side wall of the expansion part of the vertical section of the feed port 16, the rotation of the first differential head 14 can drive the valve core 15 to vertically lift through the first connecting piece to change the size of the gap, so as to adjust the flow rate of the slurry entering the slurry cavity 13 and the flow rate of the slurry entering the coating die head 2 from the discharge port 17 (the flow rate of the slurry is referred to as the flow rate of the flow rate adjusting valve), specifically, the gap is increased, the amount of the slurry entering the coating die head 2 is increased, the gap is decreased, and the amount of the slurry entering the coating die head 2 is decreased.
Of course, as another embodiment, the slurry chamber 13, the inlet 16, and the outlet 17 of the throttle valve 1 may be disposed on the upper valve body 11, and correspondingly, the first differential head 14 may be disposed on the lower valve body 12.
Specifically, each pressure sensor 3 is mounted on the upper die head 21, and the pressure sensors 3 are arranged in one-to-one correspondence with the slurry channels 24 so as to detect the slurry pressure in the corresponding slurry channels 24 in time. Specifically, the pressure sensor 3 is installed in a threaded pipe 27 formed in the upper die head 21, an elastic collar 29 is arranged between the inner wall of the threaded pipe 27 and the outer wall of the pressure sensor 3, the elastic collar 29 seals a gap between the pressure sensor 3 and the threaded pipe 27 to prevent slurry from entering the threaded pipe 27 to cause blockage, and of course, the pressure sensor 3 can also be fixed in the corresponding threaded pipe 27 in a common manner such as bonding, and thus, the elastic collar 29 is not required to be arranged. The upper part of the threaded pipe 27 is covered with a cover plate 28, the cover plate 28 is fixed on the upper die head 21 through bolts, and the cover plate 28 is used for preventing impurities such as dust and the like from entering the threaded pipe 27.
The first control module is electrically connected to the plurality of pressure sensors 3 and the plurality of throttle valves 1, and responds to the pressure detection signal from the pressure sensor 3 to adjust the opening of the corresponding throttle valve 1, so as to change the amount of the slurry entering the slurry distribution chamber 23 through the corresponding slurry channel 24, so that the slurry entering the slurry distribution chamber 23 through each slurry channel 24 has a uniform flow rate, thereby achieving a good uniform distribution of the slurry in the slurry distribution chamber 23 in advance, and finally, the slurry is uniformly applied from the slurry distribution chamber 23 to the substrate through the application slit 25 and the application lip 26, so that the uniformity of the transverse surface density of the coating is good, but the adjustment of the slurry is referred to as coarse adjustment.
Of course, in order to further improve the uniformity of the coating surface density, the coating apparatus may further include a plurality of coating adjustment mechanisms, a plurality of wet film thickness measuring mechanisms (not shown), and a second control module (not shown).
The coating adjusting mechanism is arranged on the coating die head 2 and comprises a driving piece and an adjusting block driven by the driving piece, and the adjusting block extends into the coating slit 25 to change the height of the coating slit 25 so as to adjust the coating flow. The plurality of adjustment blocks are arranged side by side along the length of the coating die 2, so that each region of the coating slot 25 can be adjusted, and the problem that some regions are not covered by the adjustment blocks and cannot be adjusted is avoided. In this embodiment, the coating adjustment mechanism is a T-block adjustment mechanism, the driving member is a second differential head 41, the adjustment blocks are T-blocks 43, the second differential head 41 of each T-block adjustment mechanism 4 protrudes from the top surface of the upper die 21, the lower outer surface of the second differential head 41 is in threaded connection with a support 44, the support 44 is fixed on the upper die 21, the T-blocks 43 are fixedly connected to the lower portion of the second differential head 41 through a coupling 42, and the T-blocks 43 are exposed to the coating slit 25. When the second differential head 41 is rotated, the second differential head 41 is vertically lifted relative to the support 44, and accordingly, the second differential head 41 drives the T-block 43 to be synchronously vertically lifted through the coupling 42, so that the height of the T-block 43 extending into the coating slit 25 can be changed, and further the flow rate of the slurry sprayed from the coating slit 25 through the coating lip 26 (herein, the flow rate of the slurry is referred to as the coating flow rate) can be adjusted, when the T-block 43 is lifted, the height of the T-block 43 extending into the coating slit 25 becomes smaller, the height of the coating slit 25 becomes larger, the amount of the slurry entering the coating lip 26 increases, and when the T-block 43 is lowered, the height of the T-block 43 extending into the coating slit 25 becomes larger, the height of the coating slit 25 becomes smaller, and the amount of the slurry entering the coating lip 26 decreases.
The wet film thickness measuring mechanisms are arranged at the rear end of the operation direction of the coating lip 26, are arranged side by side along the width direction of the substrate coated by the coating lip 26, and are suitable for detecting the thickness of a wet film formed on the substrate after being coated by the coating lip 26.
The second control module is electrically connected to the plurality of wet film thickness measuring mechanisms and the plurality of T-block adjusting mechanisms 4, and responds to a wet film thickness detection signal sent by the wet film thickness measuring mechanism to adjust the height of the corresponding T-block 43 extending into the coating slit 25, so as to adjust the flow rate of the slurry applied from the coating slit 25 to the substrate via the coating lip 26, and further make the slurry applied from the coating lip 26 to the substrate uniform, where the adjustment is referred to as micro-adjustment.
In this embodiment, the design that coarse adjustment and fine adjustment combine together can be used with the fine adjustment in the cooperation of coarse adjustment under the high condition of the horizontal areal density requirement of coating, and can stop the fine adjustment under the not high condition of the horizontal areal density requirement of coating, can let the homogeneity of the horizontal areal density of coating of thick liquids good with the help of coarse adjustment, so, can improve coating device's adaptability.
It should be noted that the coating apparatus further includes a shunt tank 5, and the shunt tank 5 communicates with the plurality of slurry passages 24. That is, choke valve 1 is located between reposition of redundant personnel jar 5 and the coating die head 2, and the pipeline that choke valve 1 is connected with reposition of redundant personnel jar 5 can be the pipeline commonly used, also can be the hose line, and the hose line flexible is in order to save the arrangement space, and all is equipped with stainless steel clamp pipe formula on the pipeline that is connected between choke valve 1 and reposition of redundant personnel jar 5 and between choke valve 1 and the coating die head 2, realizes clamp formula and connects. Of course, the inlet opening 16 of the throttle valve 1 can also be connected directly to the tapping pot 5 without being connected by means of a pipe. The slurry enters the shunt tank 5 and is equalized and then enters the coating die head 2 through the slurry channel 24 and the throttling valve 1 on the slurry channel. Specifically, the distribution tank 5 may be provided as a rectangular parallelepiped, a cube, or a cylinder, and the shape of the distribution tank 5 is not particularly limited, and is preferably a cylinder, which facilitates the circulation of the slurry. Of course, the diversion tank 5 may be eliminated and the plurality of slurry conduits 24 may be in direct communication with one or more external slurry storage devices (not shown).
Example 2
As shown in fig. 2, 4, 5 and 6, the present embodiment provides a coating surface density closed-loop adjusting method based on the foregoing coating apparatus, including the following steps:
acquiring a pressure detection value on each slurry channel 24 in real time;
judging whether the obtained multiple pressure detection values are equal to a preset pressure threshold value or not;
if the pressure detection value is not equal to the preset pressure threshold value, adjusting the opening of the corresponding flow regulating valve until the obtained pressure detection value on each slurry channel 24 is equal to the preset pressure threshold value; specifically, if the pressure detection value is not equal to the preset pressure threshold value as a result of the determination, the step of adjusting the opening size of the corresponding flow regulating valve includes:
reading the serial number of the corresponding pressure sensor 3 on the slurry channel 24, recording the pressure measuring times of the pressure sensor 3 with the serial number, and judging whether the absolute difference value of the two adjacent pressure measuring times of the pressure sensor 3 with the serial number is greater than T time;
if the judgment result is that the absolute difference value of the two adjacent pressure measuring times is greater than the T time, the information of the measuring time point and the information of the measuring times before the pressure sensor 3 with the serial number are cleared;
if the judgment result is that the absolute difference value of the pressure measuring time of two adjacent times is not more than the T time, continuously judging whether the pressure measuring times of the pressure sensor 3 with the serial number are more than m times;
if the judgment result is that the pressure measuring times are more than m times, a first alarm signal is sent out;
if the judgment result is that the pressure measuring times are not more than m, comparing the pressure detection value of the pressure sensor with the preset pressure threshold value;
if the judgment result is that the pressure detection value of the pressure sensor 3 with the serial number is greater than the preset pressure threshold value, reducing the flow of the flow regulating valve;
and if the judgment result is that the pressure detection value of the pressure sensor 3 with the serial number is smaller than the preset pressure threshold value, increasing the flow of the flow regulating valve.
In this embodiment, pressure sensor 3 can carry out real-time detection to the pressure value in each thick liquids passageway 24, the pressure detection value in which thick liquids passageway 24 is not equal to preset pressure threshold value, just adjust the aperture of the flow control valve that corresponds, in time adjust the thick liquids volume that gets into in thick liquids passageway 24, guarantee as far as possible that the thick liquids volume in every thick liquids passageway 24 is unanimous with the thick liquids volume in other thick liquids passageways 24, thick liquids get into thick liquids distribution chamber 23 with even flow along each thick liquids passageway 24, make thick liquids have good distribution uniformity in thick liquids distribution chamber 23 in advance, so, the homogeneity of the thick liquids horizontal coating surface density of base material is good from coating lip 26 coating.
Of course, in order to further improve the uniformity of the coating transverse areal density, as shown in fig. 5 and 6, the coating areal density closed-loop adjusting method based on the coating device of the present embodiment further includes the following steps:
if the judgment result is that the pressure detection value is equal to the preset pressure threshold value, acquiring the wet film thickness value detected by each wet film thickness measuring mechanism in real time;
judging whether the thickness values of the multiple wet films acquired at the same time point are equal to a preset film thickness threshold value or not;
if the wet film thickness value is equal to the preset film thickness threshold value, continuously acquiring the wet film thickness value detected by each wet film thickness measuring mechanism at the next time point;
if the wet film thickness value is not equal to the preset film thickness threshold value, adjusting the height of the adjusting block on the corresponding coating adjusting mechanism extending into the coating slit 25 to adjust the coating flow until all the wet film thickness values obtained at the same time point are equal to the preset film thickness threshold value; specifically, if the wet film thickness value is not equal to the preset film thickness threshold value as a result of the determination, the step of adjusting the height of the corresponding adjusting block on the coating adjusting mechanism extending into the coating slit 25 includes:
reading the serial number of the corresponding wet film thickness measuring mechanism, recording the thickness measuring times of the wet film thickness measuring mechanism with the serial number, and judging whether the absolute difference value of the two adjacent thickness measuring times of the wet film thickness measuring mechanism with the serial number is greater than t time;
if the judgment result is that the absolute difference value of the two adjacent thickness measuring times is greater than t time, removing the thickness measuring time point information and the thickness measuring time information before the wet film thickness measuring mechanism with the serial number;
if the judgment result is that the absolute difference value of the two adjacent thickness measuring times is not more than t time, continuously judging whether the thickness measuring times of the wet film thickness measuring mechanism with the serial number are more than n times;
if the judgment result is that the thickness measuring times are more than n times, a second alarm signal is sent out;
if the judgment result is that the thickness measurement times are not more than n times, comparing the wet film thickness value of the wet film thickness measurement mechanism with the preset film thickness threshold value;
if the judgment result is that the wet film thickness value of the wet film thickness measuring mechanism with the serial number is larger than the preset film thickness threshold value, the height of the adjusting block on the corresponding coating adjusting mechanism extending into the coating slit 25 is increased so as to reduce the coating flow;
if the judgment result is that the wet film thickness value of the wet film thickness measuring mechanism with the serial number is smaller than the preset film thickness threshold value, the height of the adjusting block on the corresponding coating adjusting mechanism extending into the coating slit 25 is reduced to increase the coating flow.
After the pressure sensor is matched with the flow regulating valve to regulate the transverse coating density, the wet film thickness measuring mechanism is matched with the coating regulating mechanism to further regulate the transverse coating surface density, so that the uniformity of the transverse coating surface density can be realized, and the preset film thickness threshold value and the preset pressure threshold value can be changed to adapt to the requirements of different coating qualities.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of this invention are intended to be covered by the scope of the invention as expressed herein.
Claims (10)
1. A coating apparatus, comprising:
the coating device comprises a coating die head (2), wherein a coating slit (25) and a slurry distribution cavity (23) communicated with the coating slit (25) are arranged in the coating die head (2), a coating lip (26) for enabling slurry to flow out of the coating slit (25) is arranged on one side of the coating die head (2), and a plurality of slurry channels (24) communicated with the slurry distribution cavity (23) are arranged on the other side of the coating die head (2); each slurry channel (24) is provided with a pressure sensor (3) for detecting the pressure of the slurry in the slurry channel (24), and each slurry channel (24) is also provided with a flow regulating valve for regulating the feeding flow of the slurry channel (24);
and the first control module is electrically connected with the plurality of pressure sensors (3) and the plurality of flow regulating valves and responds to pressure detection signals sent by the pressure sensors (3) to regulate the opening sizes of the corresponding flow regulating valves.
2. Coating device according to claim 1, characterized in that the detection point of the pressure sensor (3) is located on the pulp passage (24) between the flow-regulating valve and the pulp distribution chamber (23).
3. Coating device according to claim 1, characterized in that the pressure sensor (3) is mounted in a threaded tube (27) in the coating die (2).
4. Coating device according to claim 3, characterized in that an elastic collar (29) is provided between the inner wall of the threaded pipe (27) and the pressure sensor (3).
5. The coating apparatus of claim 1, further comprising:
the coating adjusting mechanisms are arranged on the coating die head (2) and comprise driving pieces and adjusting blocks driven by the driving pieces to extend into the coating slit (25) so as to change the height of the coating slit (25) and further adjust the coating flow, and the adjusting blocks are arranged side by side along the length direction of the coating die head (2);
a plurality of wet film thickness measuring mechanisms which are arranged side by side in the width direction of the substrate coated by the coating lip (26) and are suitable for detecting the thickness of a wet film formed on the substrate after being coated by the coating lip (26);
and the second control module is electrically connected with the plurality of wet film thickness measuring mechanisms and the plurality of coating adjusting mechanisms, and responds to a wet film thickness detection signal sent by the wet film thickness measuring mechanisms to adjust the height of the corresponding adjusting block extending into the coating slit (25).
6. The coating device according to claim 5, characterized in that said coating adjustment mechanism is a T-block adjustment mechanism (4), said T-block adjustment mechanism (4) comprising a second differential head (41) and a T-block (43) fixedly connected to said second differential head (41) by a coupling (42), said second differential head (41) being screwed to a support (44), said support (44) being fixed to said coating die head (2).
7. A closed-loop coating surface density adjusting method based on the coating device of any one of claims 1-6, which is characterized by comprising the following steps:
acquiring a pressure detection value on each slurry channel (24) in real time;
judging whether the obtained pressure detection values are equal to a preset pressure threshold value or not;
and if the judgment result shows that the pressure detection value is not equal to the preset pressure threshold value, adjusting the opening of the corresponding flow regulating valve until the obtained pressure detection value on each slurry channel (24) is equal to the preset pressure threshold value.
8. The closed-loop adjusting method for coating surface density of the coating device according to claim 7, wherein if the pressure detection value is not equal to the preset pressure threshold value as a result of the determination, the step of adjusting the opening size of the corresponding flow regulating valve comprises:
reading the serial number of the corresponding pressure sensor (3) on the slurry channel (24), recording the pressure measuring times of the pressure sensor (3) with the serial number, and judging whether the absolute difference value of the pressure measuring time of two adjacent times of the pressure sensor (3) with the serial number is greater than T time or not;
if the judgment result is that the absolute difference value of the two adjacent pressure measurement times is greater than T time, eliminating the measurement time point information and the measurement frequency information before the pressure sensor (3) with the serial number;
if the judgment result is that the absolute difference value of the pressure measuring time of two adjacent times is not more than T time, continuously judging whether the pressure measuring times of the pressure sensor (3) with the serial number are more than m times;
if the judgment result shows that the pressure measuring times are more than m times, a first alarm signal is sent out;
if the judgment result shows that the pressure measuring times are not more than m, comparing the pressure detection value of the pressure sensor (3) with the preset pressure threshold value;
if the pressure detection value of the pressure sensor (3) with the serial number is larger than the preset pressure threshold value according to the judgment result, reducing the flow of the flow regulating valve;
and if the pressure detection value of the pressure sensor (3) with the serial number is smaller than the preset pressure threshold value according to the judgment result, increasing the flow of the flow regulating valve.
9. The closed-loop adjustment method for the coating surface density of the coating device according to claim 7, wherein if the pressure detection value is equal to a preset pressure threshold value as a result of the determination, the wet film thickness value detected by each wet film thickness measuring mechanism is obtained in real time;
judging whether the thickness values of the plurality of wet films acquired at the same time point are equal to a preset film thickness threshold value or not;
if the judgment result is that the wet film thickness value is equal to the preset film thickness threshold value, continuously acquiring the wet film thickness value detected by each wet film thickness measuring mechanism at the next time point;
and if the judgment result shows that the wet film thickness value is not equal to the preset film thickness threshold value, adjusting the height of an adjusting block on the corresponding coating adjusting mechanism extending into the coating slit (25) to adjust the coating flow until all the wet film thickness values acquired at the same time point are equal to the preset film thickness threshold value.
10. The closed-loop adjusting method for the coating surface density of the coating device according to claim 9, wherein if the wet film thickness value is not equal to the preset film thickness threshold value as a result of the determination, the step of adjusting the height of the adjusting block on the corresponding coating adjusting mechanism extending into the coating slit (25) comprises:
reading the serial number of the corresponding wet film thickness measuring mechanism, recording the thickness measuring times of the wet film thickness measuring mechanism of the serial number, and judging whether the absolute difference value of the two adjacent thickness measuring times of the wet film thickness measuring mechanism of the serial number is greater than t time or not;
if the judgment result is that the absolute difference value of the two adjacent thickness measuring times is greater than t time, removing the thickness measuring time point information and the thickness measuring time information before the wet film thickness measuring mechanism with the serial number;
if the judgment result is that the absolute difference value of the two adjacent thickness measuring times is not more than t time, continuously judging whether the thickness measuring times of the wet film thickness measuring mechanism with the serial number are more than n times;
if the judgment result is that the thickness measuring times are more than n times, a second alarm signal is sent out;
if the judgment result is that the thickness measuring times are not more than n times, comparing the wet film thickness value of the wet film thickness measuring mechanism with the preset film thickness threshold value;
if the judgment result is that the wet film thickness value of the wet film thickness measuring mechanism with the serial number is larger than the preset film thickness threshold value, the height of the adjusting block on the corresponding coating adjusting mechanism extending into the coating slit (25) is increased so as to reduce the coating flow;
and if the judgment result is that the wet film thickness value of the wet film thickness measuring mechanism with the serial number is smaller than the preset film thickness threshold value, reducing the height of the corresponding adjusting block on the coating adjusting mechanism extending into the coating slit (25) so as to increase the coating flow.
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