An apparatus and method for suppressing interference in a coating process

Abstract

The present invention relates to a device and method for suppressing interference in the coating process. The device includes a die head, a die head mounting seat, a back roll, a back roll mounting plate, a motor screw mechanism, a coarse adjustment wedge block, a displacement driving mechanism, and a fine adjustment wedge block. The die head is mounted on the die head mounting seat, and the back roll is mounted on the back roll mounting plate. The motor screw mechanism is arranged vertically, and the coarse adjustment wedge block is connected in cooperation with the screw to move up and down under the drive of the screw. The fine adjustment wedge block is mounted on the lower part of the die head mounting seat and faces the coarse adjustment wedge block. The die head mounting seat is mounted on the moving end of the displacement driving mechanism to press the fine adjustment wedge block against the coarse adjustment wedge block under its drive. A non-contact displacement sensor with the working direction facing the back roll is mounted on the die head to detect the change in the gap between the lip and the back roll in real time, and a displacement sensor is mounted on the die head mounting seat to detect the change in the gap between the die head mounting seat and the back roll mounting plate in real time. The device and method are beneficial to improving the coating uniformity.

Description

Technical Field

[0001] The present invention belongs to the technical field of coating, and particularly relates to a device and method for suppressing interference in the coating process. Background Art

[0002] During coating, the slurry enters the lower die through the coating pipeline, then enters the slit, and is coated on the substrate on the back roll through the slit and the lip.

[0003] The back roll cannot be processed into a perfect cylinder, and there must be cylindricity errors. Added to the errors during the rotation of the bearing, it causes the distance between the die lip and the back roll to change with the rotation angle of the back roll, resulting in inconsistent coating weights. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for suppressing interference in the coating process, which are beneficial to improving coating uniformity.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a device for suppressing interference in the coating process, including a die head, a die head mounting seat, a back roll, a back roll mounting plate, a motor screw mechanism, a coarse adjustment wedge block, a displacement driving mechanism, and a fine adjustment wedge block. The die head is installed on the die head mounting seat, the back roll is installed on the back roll mounting plate, the motor screw mechanism is arranged vertically, the coarse adjustment wedge block is connected with the screw of the motor screw mechanism in a matching manner to move up and down under the drive of the screw, the fine adjustment wedge block is installed at the lower part of the die head mounting seat and faces the coarse adjustment wedge block, and the die head mounting seat is installed on the moving end of the displacement driving mechanism to press the fine adjustment wedge block against the coarse adjustment wedge block under its drive; a non-contact displacement sensor with the working direction facing the back roll is installed on the die head to detect the change of the gap between the lip and the back roll in real time, and a displacement sensor is installed on the die head mounting seat to detect the change of the gap between the die head mounting seat and the back roll mounting plate in real time.

[0006] Further, the displacement driving mechanism is a cylinder driving mechanism. The die head mounting seat is installed at the front end of the piston rod of the cylinder driving mechanism to press the fine adjustment wedge block against the coarse adjustment wedge block under its drive, and make the fine adjustment wedge block always press against the coarse adjustment wedge block during the up and down movement of the coarse adjustment wedge block, so that the fine adjustment wedge block moves back and forth under the action of the coarse adjustment wedge block.

[0007] Further, the fine adjustment wedge block is an electro-displacement conversion device, and the deformation of the fine adjustment wedge block is controlled by an electric signal to realize the high-speed and high-precision adjustment of its lateral dimension, and further realize the high-speed and high-precision fine adjustment of the position of the die head mounting seat and the die head thereon.

[0008] Further, the fine-tuning wedge block includes an integrated wedge block and a piezoelectric ceramic. The integrated wedge block is composed of a wedge part, an elastic part, and a connecting part formed by integral machining. The piezoelectric ceramic is installed in the middle cavity of the integrated wedge block to deform when receiving an electrical signal, driving the connecting part to perform high-speed and high-precision displacement relative to the wedge part.

[0009] Further, a hinge seat is provided at the rear side of the connecting part, and it is connected to the die head mounting seat through the hinge seat, enabling the fine-tuning wedge block to rotate at a certain angle relative to the die head mounting seat to offset machining and installation errors.

[0010] Further, displacement driving mechanisms are provided on both the left and right sides of the die head. The displacement driving mechanisms on both sides are respectively connected to the die head mounting seat to respectively control the front-back displacement of both sides of the die head.

[0011] Further, non-contact displacement sensors are provided on both the left and right sides of the die head to simultaneously detect the change in the gap between the lip of both sides of the die head and the back roller; displacement sensors are provided on both the left and right sides of the die head mounting seat to simultaneously detect the change in the gap between both sides of the die head mounting seat and the back roller mounting plate.

[0012] Further, a control unit is further included. The input ends of the control unit are respectively connected to the non-contact displacement sensors and the displacement sensors, and the output ends are respectively connected to the motor screw mechanism, the displacement driving mechanism, and the fine-tuning wedge block.

[0013] The present invention also provides a method for suppressing interference in the coating process, including the following steps:

[0014] 1) Along the length direction of the back roller, measure the shape and size of its different cross-sections; calculate the change in the gap between the lip and the back roller at each angle on each cross-section during the rotation of the back roller, and the optimal value of the front-back displacement of the die head to keep the gap between the lip and the back roller unchanged.

[0015] 2) Before starting coating, control the displacement driving mechanism to drive the die head mounting seat forward, and press the fine-tuning wedge block against the coarse-tuning wedge block.

[0016] 3) Control the motor screw mechanism to work, drive the coarse-tuning wedge block to move vertically, and then drive the fine-tuning wedge block to move horizontally to adjust the gap between the lip and the back roller to the average value required for coating; confirm the displacement of the die head mounting seat through the readings of the displacement sensors.

[0017] 4) When starting the coating, the back roller rotates. During the rotation of the back roller, in order to compensate for the cylindricity error of the back roller, according to different rotation speeds of the back roller, it is divided into the following two situations: When the rotation speed of the back roller does not exceed the set value, the coarse adjustment wedge block is controlled to move up and down periodically through the motor screw mechanism, and drives the die head to move back and forth through the fine adjustment wedge block and the die head mounting seat, so that the gap between the lip and the back roller remains constant, suppressing the interference during the coating process; When the rotation speed of the back roller exceeds the set value, the deformation of the fine adjustment wedge block is controlled by an electric signal, and drives the die head to move back and forth through the die head mounting seat, so that the gap between the lip and the back roller remains constant, suppressing the interference during the coating process.

[0018] Further, when the rotation speed of the back roller is slow, that is, does not exceed the set value, control the motor screw mechanism to work, drive the coarse adjustment wedge block to move up and down periodically, and then move the die head back and forth, thereby compensating in real time for the fluctuation of the gap between the lip and the back roller during the rotation of the back roller, making it as constant as possible; the displacement of the die head is obtained according to the optimal value calculated in step 1, and at the same time, it is fine-tuned according to the reading of the non-contact displacement sensor; confirm the front and back displacement of the die head mounting seat through the reading of the displacement sensor and feedback to control the up and down displacement of the coarse adjustment wedge block; When the rotation speed of the back roller is fast, that is, exceeds the set value, control the deformation of the fine adjustment wedge block through an electric signal, and then move the die head back and forth, thereby compensating in real time for the fluctuation of the gap between the lip and the back roller during the rotation of the back roller, making it as constant as possible; the displacement of the die head is obtained according to the optimal value calculated in step 1, and at the same time, it is fine-tuned according to the reading of the non-contact displacement sensor; confirm the front and back displacement of the die head mounting seat through the reading of the displacement sensor and feedback to control the up and down displacement of the fine adjustment wedge block.

[0019] Compared with the prior art, the present invention has the following beneficial effects: It provides an interference suppression device and method for the coating process. This device and method combine coarse adjustment and fine adjustment. The coarse adjustment has low cost and large stroke, and can realize the dynamic compensation of the gap between the die head and the back roller during low-speed coating. The fine adjustment has fast movement speed, high precision and large thrust, and can achieve precise control even during high-speed coating (60 m / min - 80 m / min), making the gap between the die head lip and the back roller remain constant, suppressing the interference during the coating process, thereby improving the uniformity of the coating weight. Therefore, the present invention has strong practicability and broad application prospects. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the device in the embodiment of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the fine adjustment wedge block in the embodiment of the present invention. Detailed Embodiments

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] As Figure 1 shown, this embodiment provides an interference suppression device for the coating process, including a die head 1, a die head mounting seat 2, a back roll 3, a back roll mounting plate 4, a motor screw mechanism 5, a coarse adjustment wedge block 6, a displacement driving mechanism 7, and a fine adjustment wedge block 8. The die head 1 is installed on the die head mounting seat 2, the back roll 3 is installed on the back roll mounting plate 4, the motor screw mechanism 5 is arranged vertically, the coarse adjustment wedge block 6 is connected in cooperation with the screw of the motor screw mechanism 5 to move up and down under the drive of the screw and the external guiding action. The fine adjustment wedge block 8 is installed at the lower part of the die head mounting seat 2 and is directly opposite to the coarse adjustment wedge block 6. The die head mounting seat 2 is installed on the moving end of the displacement driving mechanism 7 to press the fine adjustment wedge block 8 against the coarse adjustment wedge block 6 under its drive. A non-contact displacement sensor 9 with the working direction facing the back roll is installed on the die head 1 to detect the change in the gap between the lip and the back roll in real time. A displacement sensor 10 is installed on the die head mounting seat 2 to detect the change in the gap between the die head mounting seat and the back roll mounting plate in real time. Among them, the displacement sensor 10 on the die head mounting seat 2 can be a contact type or a non-contact type.

[0024] In this embodiment, the displacement driving mechanism 7 is a cylinder driving mechanism. The die head mounting seat is installed at the front end of the piston rod of the cylinder driving mechanism to press the fine adjustment wedge block against the coarse adjustment wedge block under its drive. During the up and down movement of the coarse adjustment wedge block, the cylinder driving mechanism is always in the extended state, so that the fine adjustment wedge block always abuts against the coarse adjustment wedge block, so that the fine adjustment wedge block moves back and forth under the action of the coarse adjustment wedge block.

[0025] The coarse adjustment wedge block 6 is used for low-speed and low-precision coarse adjustment of the position of the die head mounting seat. The fine adjustment wedge block 8 is an electro-displacement conversion device. By controlling the fine adjustment wedge block to deform through an electric signal, the high-speed and high-precision adjustment of its lateral dimension can be realized, with a resolution up to the nanometer level, an accuracy up to 0.1 micrometer, and a response frequency up to 1 kHz. Furthermore, the high-speed and high-precision fine adjustment of the die head mounting seat and the die head position thereon can be realized. As Figure 2 shown, the fine adjustment wedge block 8 includes an integral wedge block and a piezoelectric ceramic 805. The integral wedge block is composed of a wedge part 801, an elastic part 802, and a connecting part 803 formed by integral processing. The piezoelectric ceramic is installed in the middle cavity of the integral wedge block to deform when receiving an electric signal, driving the connecting part to perform high-speed and high-precision displacement relative to the wedge part. In this embodiment, a hinge seat 804 is provided at the rear side of the connecting part 803, and the fine adjustment wedge block 8 is connected to the die head mounting seat 2 through the hinge seat 804, so that the fine adjustment wedge block 8 can rotate at a certain angle relative to the die head mounting seat to offset the machining and installation errors.

[0026] The left and right sides of the die head 1 are provided with displacement drive mechanisms, which are respectively connected to the die head mounting base 2 to respectively control the front and rear displacements of the left and right sides of the die head. The purpose of such a setting is, on the one hand, to improve the freedom of the die head movement and adjust the gaps on the left and right sides respectively, and on the other hand, to ensure the driving force and stable operation of the front and rear movement of the die head mounting base.

[0027] In order to ensure the accuracy of measurement, non-contact displacement sensors are provided on both sides of the die head to simultaneously detect the change in the gap between the lip on both sides of the die head and the back roller. Displacement sensors are provided on both sides of the die head mounting seat to simultaneously detect the change in the gap between the left and right sides of the die head mounting seat and the back roller mounting plate.

[0028] The coating process interference suppression device also includes a control unit, the input end of which is respectively connected to the non-contact displacement sensor and the displacement sensor, and the output end is respectively connected to the motor screw mechanism, the displacement drive mechanism and the fine-tuning wedge block to receive the measurement data of the sensor and control the operation of each mechanism and unit.

[0029] This embodiment also provides a coating process interference suppression method based on the above device, comprising the following steps:

[0030] 1) Measure the shape and size of different cross sections along the length of the backing roller; calculate the change in the gap between the lip and the backing roller at each angle on each cross section during the rotation of the backing roller, and the optimal value of the front and rear displacement of the left and right sides of the die head to keep the gap between the lip and the backing roller unchanged.

[0031] 2) Before starting coating, control the displacement drive mechanism to drive the die head mounting seat forward and place the fine adjustment wedge block against the coarse adjustment wedge block.

[0032] 3) Control the motor screw mechanism to drive the coarse adjustment wedge block to move vertically, and then drive the fine adjustment wedge block to move horizontally, so as to adjust the gap between the lip and the back roller to the average value required for coating; confirm the displacement of the die head mounting seat through the reading of the displacement sensor.

[0033] Due to the bounce of the back roller itself, the distance between the lip and the back roller will increase and decrease when the back roller rotates. The purpose of the coarse adjustment and fine adjustment devices is to maintain the distance between the lip and the back roller. For example, when the distance between the lip and the back roller is about to increase, the die head is pushed toward the back roller, and the movement is confirmed by the reading of the contact displacement sensor, and the compensation of the distance between the back roller and the lip is confirmed by the non-contact displacement sensor.

[0034] 4) When starting the coating, the back roller rotates. During the rotation of the back roller, in order to compensate for the cylindricity error of the back roller, according to different rotation speeds of the back roller, it is divided into the following two situations: When the rotation speed of the back roller does not exceed the set value, the coarse adjustment wedge block is controlled to move up and down periodically through the motor screw mechanism, and the die head is driven to move back and forth through the fine adjustment wedge block and the die head mounting seat, so that the gap between the lip and the back roller remains constant, suppressing the interference during the coating process; When the rotation speed of the back roller exceeds the set value, the deformation of the fine adjustment wedge block is controlled through an electrical signal, and the die head is driven to move back and forth through the die head mounting seat, so that the gap between the lip and the back roller remains constant, suppressing the interference during the coating process. Specifically:

[0035] When the rotation speed of the back roller is slow, that is, does not exceed the speed set value, control the motor screw mechanism to work, drive the coarse adjustment wedge block to move up and down periodically, and then move the die head back and forth, thereby compensating in real time for the fluctuation of the gap between the lip and the back roller during the rotation of the back roller, making it as constant as possible; The displacement of the die head is obtained according to the optimal value calculated in step 1, and at the same time, it is fine-tuned according to the reading (real-time value) of the non-contact displacement sensor; The front and back displacement of the die head mounting seat is confirmed through the reading of the displacement sensor, and the up and down displacement of the coarse adjustment wedge block is feedback-controlled.

[0036] When the rotation speed of the back roller is fast, that is, exceeds the speed set value, control the deformation of the fine adjustment wedge block through an electrical signal, and then move the die head back and forth, thereby compensating in real time for the fluctuation of the gap between the lip and the back roller during the rotation of the back roller, making it as constant as possible; The displacement of the die head is obtained according to the optimal value calculated in step 1, and at the same time, it is fine-tuned according to the reading (real-time value) of the non-contact displacement sensor; The front and back displacement of the die head mounting seat is confirmed through the reading of the displacement sensor, and the up and down displacement of the fine adjustment wedge block is feedback-controlled.

[0037] The above is the preferred embodiment of the present invention. Any changes made according to the technical solution of the present invention, when the functions and effects generated do not exceed the scope of the technical solution of the present invention, shall fall within the protection scope of the present invention.

Claims

1. A coating process interference suppression device, characterized in that, It includes a die head, a die head mounting seat, a back roll, a back roll mounting plate, a motor screw mechanism, a coarse adjustment wedge block, a displacement driving mechanism and a fine adjustment wedge block. The die head is mounted on the die head mounting seat, the back roll is mounted on the back roll mounting plate, the motor screw mechanism is arranged vertically, the coarse adjustment wedge block is in mating connection with the screw rod of the motor screw mechanism to move up and down under the drive of the screw rod, the fine adjustment wedge block is mounted at the lower part of the die head mounting seat and faces the coarse adjustment wedge block, and the die head mounting seat is mounted on the moving end of the displacement driving mechanism to press the fine adjustment wedge block against the coarse adjustment wedge block under its drive; a non-contact displacement sensor with the working direction facing the back roll is mounted on the die head to detect the change of the gap between the lip and the back roll in real time, and a displacement sensor is mounted on the die head mounting seat to detect the change of the gap between the die head mounting seat and the back roll mounting plate in real time.

2. The interference suppression device for a coating process according to claim 1, wherein The displacement driving mechanism is a cylinder driving mechanism. The die head mounting seat is mounted at the front end of the piston rod of the cylinder driving mechanism to press the fine adjustment wedge block against the coarse adjustment wedge block under its drive and make the fine adjustment wedge block always press against the coarse adjustment wedge block during the up and down movement of the coarse adjustment wedge block, so that the fine adjustment wedge block moves back and forth under the action of the coarse adjustment wedge block.

3. The interference suppression device for the coating process according to claim 1, characterized in that, The fine adjustment wedge block is an electro-displacement conversion device. The deformation of the fine adjustment wedge block is controlled by an electric signal to realize the high-speed and high-precision adjustment of its lateral dimension, and further realize the high-speed and high-precision fine adjustment of the position of the die head mounting seat and the die head thereon.

4. The interference suppression device for a coating process according to claim 3, characterized in that, The fine adjustment wedge block includes an integral wedge block and a piezoelectric ceramic. The integral wedge block is composed of a wedge part, an elastic part and a connecting part formed by integral processing. The piezoelectric ceramic is mounted in the middle cavity of the integral wedge block to deform when receiving an electric signal and drive the connecting part to perform high-speed and high-precision displacement relative to the wedge part.

5. An interference suppression device for a coating process according to claim 4, characterized in that, A hinge seat is provided at the rear side of the connecting part and is connected to the die head mounting seat through the hinge seat, so that the fine adjustment wedge block can rotate at a certain angle relative to the die head mounting seat to offset the machining and installation errors.

6. The interference suppression device for the coating process according to claim 1, characterized in that, Displacement driving mechanisms are provided on both the left and right sides of the die head. The displacement driving mechanisms on the left and right sides are respectively connected to the die head mounting seat to respectively control the front and rear displacements of both the left and right sides of the die head.

7. A coating process interference suppression device according to claim 1, characterized in that, Non-contact displacement sensors are provided on both the left and right sides of the die head to simultaneously detect the change of the gap between the lip of both the left and right sides of the die head and the back roll; displacement sensors are provided on both the left and right sides of the die head mounting seat to simultaneously detect the change of the gap between both the left and right sides of the die head mounting seat and the back roll mounting plate.

8. The interference suppression device for the coating process according to claim 1, wherein It further includes a control unit. The input ends of the control unit are respectively connected to the non-contact displacement sensor and the displacement sensor, and the output ends are respectively connected to the motor screw mechanism, the displacement driving mechanism and the fine adjustment wedge block.

9. A method for suppressing interference in the coating process based on the device according to any one of claims 1-8, characterized in that, It includes the following steps: 1) Along the length direction of the back roll, measure the shapes and sizes of its different cross-sections; calculate the change of the gap between the lip and the back roll at each angle on each cross-section during the rotation of the back roll, and the optimal value of the front and rear displacement of the die head to keep the distance between the lip and the back roll unchanged. 2) Before starting coating, control the displacement drive mechanism to drive the die head mounting seat forward, and press the fine-tuning wedge block against the coarse-tuning wedge block. 3) Control the motor screw mechanism to work, drive the coarse-tuning wedge block to move vertically, and then drive the fine-tuning wedge block to move horizontally to adjust the gap between the lip and the back roller to the average value required for coating; confirm the displacement of the die head mounting seat through the reading of the displacement sensor. 4) When starting coating, the back roller rotates; during the rotation of the back roller, in order to compensate for the cylindricity error of the back roller, according to different rotation speeds of the back roller, it is divided into the following two situations: when the rotation speed of the back roller does not exceed the set value, control the motor screw mechanism to control the periodic up and down movement of the coarse-tuning wedge block, drive the die head to move back and forth through the fine-tuning wedge block and the die head mounting seat, so that the gap between the lip and the back roller remains constant and suppresses the interference during the coating process; when the rotation speed of the back roller exceeds the set value, control the deformation of the fine-tuning wedge block through an electrical signal, drive the die head to move back and forth through the die head mounting seat, so that the gap between the lip and the back roller remains constant and suppresses the interference during the coating process.

10. A method for suppressing interference in a coating process according to claim 9, characterized in that, When the rotation speed of the back roller is slow, that is, does not exceed the set value, control the motor screw mechanism to work, drive the coarse-tuning wedge block to move up and down periodically, and then move the die head back and forth, thereby compensating in real time for the fluctuation of the gap between the lip and the back roller during the rotation of the back roller and making it as constant as possible; the displacement of the die head is obtained according to the optimal value calculated in step 1, and at the same time, it is fine-tuned according to the reading of the non-contact displacement sensor; confirm the forward and backward displacement of the die head mounting seat through the reading of the displacement sensor and feedback to control the up and down displacement of the coarse-tuning wedge block. When the rotation speed of the back roller is fast, that is, exceeds the set value, control the deformation of the fine-tuning wedge block through an electrical signal, and then move the die head back and forth, thereby compensating in real time for the fluctuation of the gap between the lip and the back roller during the rotation of the back roller and making it as constant as possible; the displacement of the die head is obtained according to the optimal value calculated in step 1, and at the same time, it is fine-tuned according to the reading of the non-contact displacement sensor; confirm the forward and backward displacement of the die head mounting seat through the reading of the displacement sensor and feedback to control the up and down displacement of the fine-tuning wedge block.

Images