CN111672704B - Automatic non-contact surface density adjusting system and adjusting method - Google Patents
Automatic non-contact surface density adjusting system and adjusting method Download PDFInfo
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- CN111672704B CN111672704B CN202010528118.7A CN202010528118A CN111672704B CN 111672704 B CN111672704 B CN 111672704B CN 202010528118 A CN202010528118 A CN 202010528118A CN 111672704 B CN111672704 B CN 111672704B
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- lip
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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
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
- B05D3/0493—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases using vacuum
Abstract
The invention discloses an automatic non-contact surface density adjusting system and an adjusting method, and relates to the automatic non-contact surface density adjusting system which comprises an upper die head, a lower die head, foil and a plurality of vacuum box devices, wherein the upper die head and the lower die head are detachably connected, a discharging slit is arranged between the upper die head and the lower die head, a lip gap is arranged between the discharging slit and the foil, the vacuum box devices are distributed on the lip, and are used for adjusting the environmental pressure of the lip and adjusting the coated surface density according to the adjusted environmental pressure. The invention is a non-contact adjusting mode, the pressure can be quantitatively controlled by the wind frequency of the negative pressure fan, online adjustment can be realized, and the mould can not be damaged.
Description
Technical Field
The invention relates to the technical field of coating density adjustment, in particular to an automatic non-contact surface density adjusting system and an adjusting method.
Background
Since the development of a lithium ion secondary battery using graphite as a negative electrode and lithium cobaltate as a positive electrode in 1990, performance such as safety and life of the battery was greatly improved. Nowadays, lithium ion secondary batteries are rapidly developed, occupy the role of the battery industry and are widely applied to daily life of people.
In the production process of the lithium ion secondary battery, a coating process is a key process, and the coating operation is mainly completed by using an extrusion coating mode in the industry. During the coating process, the transverse surface density is inconsistent and even exceeds the process standard. At present, a torque wrench or a servo motor is used for adjusting a screw of a die lip, and the phenomenon of inconsistent surface density is improved by using the die to deform.
For example, patent publication No. CN205851236U discloses an extrusion coater, which comprises a coating die head, a coating roller and a position sensor, wherein a substrate is arranged between the coating roller and the coating die head, the surface of the coating roller is provided with a ventilation area, the ventilation area and the coating die head are oppositely arranged, and the position sensor is arranged on one side of the substrate. In the extrusion coater described above, the position sensor is used to detect the distance between the substrate and the surface of the coating roll in the direction in which the coating die is directed toward the axis of the coating roll. And blowing gas from the ventilation area of the coating roller to lift and suspend the base material on the coating roller, and comparing the difference value between the distance from the base material to the coating roller before coating and the distance from the base material to the coating roller during coating with the preset range value to adjust the amount of the slurry extruded by the coating die head, so that the amount of the slurry extruded by the coating die head is kept stable, and the surface density precision of coating and the surface quality of the coating are improved. Although the above patent can improve the accuracy of the coated surface density, it cannot achieve the uniform adjustment of the transverse surface density by adjusting the pump speed to change the overall surface density through the distance data.
Therefore, the present invention provides an automatic non-contact surface density adjusting system and method for solving the above technical problems
Disclosure of Invention
The invention aims to provide an automatic non-contact surface density adjusting system and an automatic non-contact surface density adjusting method aiming at the defects of the prior art, wherein the surface density is adjusted by changing the environmental pressure at the discharging position of a die head, and the pressure can be quantitatively controlled by the wind frequency of a negative pressure fan, so that the online adjustment can be realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an automatic non-contact surface density governing system, includes die head, lower die head, foil, the box device of several vacuum, go up die head and lower die head and can dismantle the connection, it is equipped with ejection of compact slit to go up between die head and the lower die head, be equipped with the lip clearance between ejection of compact slit and the foil, the box device of several vacuum distributes on the lip, the vacuum box device is used for adjusting the ambient pressure of lip, and according to the surface density of coating is adjusted to the ambient pressure of adjusting.
Furthermore, the vacuum box devices are distributed on the lip at the position of 5-50 mm.
Further, still include the fixed bolster, the fixed bolster includes horizontal slide rail, slider and horizontal slide rail sliding connection, vacuum box device and slider fixed connection.
Further, the fixed bolster still includes vertical slide rail, horizontal slide rail one end and vertical slide rail sliding connection.
Further, the vacuum box device comprises a negative pressure fan and a controller, the controller is connected with the negative pressure fan, and the controller adjusts the ambient pressure of the lip opening by controlling the air frequency of the negative pressure fan.
Further, the vacuum box device comprises a pressure sensor, and the pressure sensor is connected with the negative pressure fan and used for detecting the ambient pressure of the lip and obtaining the ambient pressure value of the lip.
Further, the vacuum box device comprises a display unit, wherein the display unit is connected with the pressure sensor and used for displaying the ambient pressure value of the lip, which is obtained by the pressure sensor.
Further, the coated surface density is adjusted according to the ambient pressure of the lip mouth, and is represented as:
wherein Q represents the areal density of the coating; b represents a slit width; h represents a lip gap; l represents the slit length; u. of0Represents the coating speed; Δ P represents the difference between the pressure at the discharge slit and the ambient pressure.
The coating device further comprises a detection unit, wherein the detection unit is connected with the controller and is used for detecting the coated surface density and sending a control instruction to the controller.
Correspondingly, an automatic non-contact surface density adjusting method is also provided, and comprises the following steps:
s1, detecting the coated surface density by a detection unit, judging whether the surface density is in a preset range, and if not, executing a step S2;
s2, the detection unit sends a control instruction to the controller according to the judgment result;
s3, the controller receives a control instruction sent by the detection unit and controls the air frequency of the negative pressure fan according to the control instruction so as to adjust the environmental pressure of the lip;
s4, detecting the environmental pressure of the lip by a pressure sensor, obtaining the environmental pressure value of the lip, and sending the environmental pressure value to a display unit;
and S5, displaying the ambient pressure value by a display unit.
Compared with the prior art, the invention is a non-contact type adjusting mode, the pressure can be quantitatively controlled through the wind frequency of the negative pressure fan, the online adjustment can be realized, and the damage to the die can be avoided; the invention can realize the consistency adjustment of the transverse surface density by arranging a plurality of vacuum box devices.
Drawings
FIG. 1 is a schematic diagram of the upper and lower die structures provided in example one;
FIG. 2 is a schematic structural diagram of a coating apparatus according to an embodiment;
FIG. 3 is a cross-sectional view of an automatic non-contact areal density adjustment system according to one embodiment;
FIG. 4 is a schematic structural diagram of a fixing bracket according to a first embodiment;
FIG. 5 is a schematic structural diagram of a vacuum box apparatus according to an embodiment;
FIG. 6 is a flowchart of an automatic non-contact areal density adjustment method according to the second embodiment;
wherein, 1, the upper die head; 2. a lower die head; 3. a foil material; 4. a vacuum box device; 5. fixing a bracket; 51. a transverse slide rail; 52. a vertical slide rail; 53. a slider; b. a discharge slit; H. the lip gap.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention aims to provide an automatic non-contact surface density adjusting system and an automatic non-contact surface density adjusting method aiming at the defects of the prior art.
Example one
The embodiment provides an automatic non-contact surface density adjusting system, as shown in fig. 1-3, including coating unit, coating unit includes die head 1, lower die head 2, foil 3, several vacuum box device 4, goes up die head 1 and can dismantle with lower die head 2 and connect, goes up and is equipped with ejection of compact slit b between die head 1 and the lower die head 2, is equipped with lip clearance H between ejection of compact slit and the foil 3, and several vacuum box device 4 distributes on the lip, and vacuum box device 4 is used for adjusting the ambient pressure of lip to the surface density of coating is adjusted according to the ambient pressure of adjusting.
The schematic diagram of slot extrusion coating is shown in fig. 2, a certain flow of slurry enters a die cavity inside a lower die head 3 from a feeding port of the lower die head through a pressure pump, stable pressure is formed, and the slurry is finally sprayed out from a die head discharging slot b and coated on a foil 3. However, the problem of non-uniform cross-directional areal density during the coating process, even beyond the process standard, is encountered, and therefore, several vacuum box assemblies 4 are distributed over the lip from 5 to 50mm in this embodiment.
As shown in fig. 4, which is a schematic structural diagram of the fixing bracket, the fixing bracket 5 is used for fixing the vacuum box device 4. Specifically, the fixed bracket 5 is a U-shaped bracket and is fixed on the coating device; the fixed support 5 comprises a transverse slide rail 51, a plurality of slide blocks 53, two vertical slide rails 52 and a cylinder (not shown in the figure), the two vertical slide rails 52 are respectively fixed at two sides of the U-shaped support, the cylinder is arranged on the vertical slide rails 52, two ends of the transverse slide rail 51 are respectively connected with the two vertical slide rails in a sliding manner, the plurality of slide blocks 53 are connected with the transverse slide rail 51 in a sliding manner, the vacuum box device 4 is fixedly connected with the slide blocks 53, one of the slide blocks is connected with one vacuum box device, and the connection mode can be hinging, threaded connection and the like; in the present embodiment, the air cylinder is used for driving the horizontal slide rail 51 to make vertical movement on the two vertical slide rails 52, so as to adjust the distance between the vacuum box device 4 and the lip, and further adjust the pressure of the lip environment; the vacuum box device 4 is fixed on the transverse slide rail 51 through a slide block 53, and can move horizontally on the transverse slide rail 51 to adjust the ambient pressure at the lip.
As shown in fig. 5, the vacuum box apparatus 4 includes a negative pressure fan, a controller, a pressure sensor, and a display unit.
The controller is connected with the negative pressure fan and used for adjusting the ambient pressure of the lip by controlling the air frequency of the negative pressure fan;
the pressure sensor is connected with the negative pressure fan and used for detecting the ambient pressure of the lip and obtaining the ambient pressure value of the lip;
and the display unit is connected with the pressure sensor and used for displaying the lip environment pressure value obtained by the pressure sensor.
In this embodiment, the relationship between the environmental pressure and the coating areal density is specifically as follows:
the coating is analyzed according to hydrodynamics, applying the differential equation of motion of viscous incompressible fluids, i.e. the N-S equation:
continuity equation:
wherein, c1、c2For the integration constant, p represents the pressure and x represents the slit upper lip length.
The system of differential equations is solved by the above equations to obtain:
wherein Q represents the areal density of the coating; b represents a slit width; h represents a lip gap; l represents the slit length; u. of0Represents the coating speed; Δ p represents the difference between the pressure at the discharge slit and the ambient pressure.
As can be seen from the above, the ambient pressure, i.e., the pressure of the vacuum box, has a significant effect on the coating density, so that the surface density can be adjusted by adjusting the pressure at the die outlet.
In this embodiment, the coating device further comprises a detection unit, wherein the detection unit is connected with the controller and is used for detecting the coated areal density and sending a control instruction to the controller.
The detection unit detects the surface density of the coating, specifically detects the surface density of the coating on line by radiation (alpha rays or beta rays), and is expressed as:
1＝I0exp(-λm)
wherein, I represents the intensity of the ray after the ray penetrates through the tested material; i is0Representing the intensity of the radiation before passing through the material to be tested; λ represents the absorption coefficient of a material substance, and has a strong correlation with the atomic number of the material substance; m represents the areal density of the material being measured.
After the online detection unit detects the surface density of the current coating, whether the surface density of the current coating meets the requirement (namely whether the surface density is within a preset range) is judged, if not, an adjusting instruction is sent to the controller, the controller receives the adjusting instruction at the moment, controls the air frequency of the negative pressure fan, adjusts the environmental pressure of the lip according to the controlled air frequency, then the pressure sensor detects the environmental pressure of the lip, the environmental pressure value of the lip is obtained, and the display unit displays the environmental pressure value of the lip obtained by the pressure sensor; then the controller reads the pressure value at the position of the discharging slit from the coating device, calculates the pressure difference between the pressure value at the position of the discharging slit and the obtained environmental pressure value, and judges whether the pressure difference is in a preset pressure range, if so, the flow is ended; if not, continuously sending an adjusting instruction to the controller until the current pressure difference is within the preset pressure range.
The embodiment uses the vacuum box device to replace the adjustment mode of the prior art, adjusts the surface density size by changing the environmental pressure at the die head discharging position, and sets multiple groups of vacuum box devices to ensure the consistency of the transverse surface density. In addition, the vacuum box device is communicated with coating surface density on-line detection equipment, and the pressure is adjusted by controlling the air frequency of the negative pressure fan, so that the surface density is adjusted on line.
Example two
The present embodiment provides an automatic non-contact surface density adjusting method, as shown in fig. 6, including the steps of:
s11, detecting the coated surface density by a detection unit, judging whether the surface density is in a preset range, and if not, executing a step S12;
s12, the detection unit sends a control instruction to the controller according to the judgment result;
s13, the controller receives a control instruction sent by the detection unit and controls the air frequency of the negative pressure fan according to the control instruction so as to adjust the environmental pressure of the lip;
s14, detecting the environmental pressure of the lip by using a pressure sensor, obtaining the environmental pressure value of the lip, and sending the environmental pressure value to a display unit;
and S15, displaying the ambient pressure value by a display unit.
It should be noted that, an automatic non-contact area density adjusting method provided in this embodiment is similar to the embodiment, and is not described herein again.
Compared with the prior art, the embodiment is a non-contact adjusting mode, the pressure can be quantitatively controlled through the wind frequency of the negative pressure fan, online adjustment can be achieved, and damage to the die can be avoided.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. An automatic non-contact surface density adjusting system is characterized by comprising an upper die head, a lower die head, a foil and a plurality of vacuum box devices, wherein the upper die head and the lower die head are detachably connected, a discharging slit is arranged between the upper die head and the lower die head, a lip gap is arranged between the discharging slit and the foil, the plurality of vacuum box devices are distributed on the lip, and the vacuum box devices are used for adjusting the environmental pressure of the lip and adjusting the coated surface density according to the adjusted environmental pressure;
the vacuum box device is characterized by further comprising a fixing support, wherein the fixing support comprises a transverse sliding rail and a sliding block, the sliding block is connected with the transverse sliding rail in a sliding mode, and the vacuum box device is fixedly connected with the sliding block;
the fixed support further comprises a vertical sliding rail, and one end of the horizontal sliding rail is connected with the vertical sliding rail in a sliding manner;
the vacuum box device comprises a negative pressure fan and a controller, the controller is connected with the negative pressure fan, and the controller adjusts the environmental pressure of the lip by controlling the air frequency of the negative pressure fan;
the coating device further comprises a detection unit, wherein the detection unit is connected with the controller and used for detecting the coating surface density and sending a control instruction to the controller.
2. The system as claimed in claim 1, wherein the plurality of vacuum box means are distributed over 5-50mm of the lip.
3. The system according to claim 2, wherein the vacuum box device comprises a pressure sensor, and the pressure sensor is connected to the negative pressure fan and is configured to detect the ambient pressure of the lip and obtain the ambient pressure of the lip.
4. The system according to claim 3, wherein the vacuum box device comprises a display unit, and the display unit is connected with the pressure sensor and is used for displaying the lip ambient pressure value obtained by the pressure sensor.
5. The system of claim 4, wherein the applied areal density is adjusted according to the ambient lip pressure as:
wherein Q represents the areal density of the coating; b represents a slit width; h represents a lip gap; l represents the slit length; u. of0Represents the coating speed; Δ P represents the difference between the pressure at the discharge slit and the ambient pressure.
6. An automatic non-contact surface density adjusting method, characterized in that the adjusting method comprises an automatic non-contact surface density adjusting system according to any one of claims 1 to 5;
the method comprises the following steps:
s1, detecting the coated surface density by a detection unit, judging whether the surface density is in a preset range, and if not, executing a step S2;
s2, the detection unit sends a control instruction to the controller according to the judgment result;
s3, the controller receives a control instruction sent by the detection unit and controls the air frequency of the negative pressure fan according to the control instruction so as to adjust the environmental pressure of the lip;
s4, detecting the environmental pressure of the lip by a pressure sensor, obtaining the environmental pressure value of the lip, and sending the environmental pressure value to a display unit;
and S5, displaying the ambient pressure value by a display unit.
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| CN112474191B (en) * | 2020-11-16 | 2021-11-09 | 深圳市曼恩斯特科技股份有限公司 | Slit coating die head |
| CN114618752A (en) * | 2022-03-16 | 2022-06-14 | 杭州安脉盛智能技术有限公司 | Control system and method for adjusting device of roll-to-roll slit extrusion equipment |
| CN114798348B (en) * | 2022-04-13 | 2023-06-23 | 安脉时代智能制造(宁德)有限公司 | Control method for weight of skiving area of coating device |
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