Coating machine die head flow rate adjustment mechanism and its operating method

Abstract

The present invention relates to a coating die head flow rate adjustment mechanism and its operating method, which includes a coarse adjustment mechanism, a fine adjustment mechanism and a flow impediment block, which are arranged in order from top to bottom. The flow impediment block is arranged above the slit to be coated, and an adjustment rod is erected at the center of the top surface, and the fine adjustment mechanism is connected between the coarse adjustment mechanism and the adjustment rod. The fine adjustment mechanism includes a piezoelectric ceramic actuator with an actuating end abutting the center of the top surface of the adjustment rod and arranged vertically. The coarse adjustment mechanism includes a first fixed seat on which a differential screw assembly is vertically mounted, the moving end of which is connected to the upper end of the piezoelectric ceramic actuator. The present invention has a reasonable design, and realizes coarse adjustment by a differential screw structure and fine adjustment by a piezoelectric ceramic actuator. The combination of coarse adjustment and fine adjustment not only effectively increases the flow rate adjustment accuracy and adjustment efficiency, but also stabilizes the coating quality and improves the coating uniformity.

Description

[Technical Field]

[0001] The present invention relates to a coating machine die head flow rate adjustment mechanism and a method for operating the same. [Background technology]

[0002] Slit coating is a coating technique in which the coating liquid is extruded along a slit in a coating die head under a certain pressure and transferred to a moving substrate. It has features such as fast coating speed, good coating uniformity, and a wide coating window, and is widely used in coating electrode sheets for lithium-ion batteries.

[0003] Currently, slit extrusion coating die heads mainly achieve the slit gap adjustment process through three methods: bolt adjustment, micrometer adjustment, or motor adjustment. Micrometer adjustment or motor adjustment uses a rigid coupling to rigidly connect the micrometer head and the adjustment block, and adjusts and controls the slit gap by rotating the micrometer head or controlling the rotation of the motor.

[0004] The method of adjusting and controlling the slit gap using a bolt involves applying force to the lip opening of the upper die or the lip opening of the lower die by tightening the bolt, thereby deforming the lip opening of the upper die or the lip opening of the lower die, and thereby changing the slit gap between the upper and lower dies. The bolt adjustment method is effective when the equipment is first used, but after a certain period of use, the lip opening becomes deformed and ineffective, making adjustment difficult. Furthermore, defects such as wear, deformation, and jamming of the bolt threads make it impossible to quickly adjust the coating process or accurately control the slit gap. Furthermore, the bolt adjustment process relies heavily on the operator's experience, resulting in slow adjustment.

[0005] The method of adjusting and controlling the slit gap using a micrometer utilizes a structure similar to a micrometer, in which an extension rod is connected to a connecting rod that is connected to an adjustment piece via a coupling, and the operator twists the micrometer head of the micrometer to control the raising or lowering of the adjustment piece and change the slit gap between the upper and lower dies. Micrometer adjustment has a scale value display and provides high precision in adjusting and controlling the slit gap, but it also has the problem that the adjustment process depends on the experience of the operator and is slow, which runs the risk of ineffective control of the areal density. Summary of the Invention [Problem to be solved by the invention]

[0006] The method of controlling the slit gap by a motor means that the output end of the motor is connected to the adjusting piece via a coupling and a connecting rod, and the motor monitors the areal density data feedback signal through a system to automatically adjust the slit gap, which has a fast adjustment control speed and adjustment accuracy dependent on closed-loop control of the feedback signal.During high-resolution control, the motor has creep phenomenon, which causes stroke error and slow response speed, which is unfavorable for optimal control of the consistency of the coating areal density, and because the motor is large, the corresponding adjusting block size is also large, which further worsens the slit adjustment resolution. [Means for solving the problem]

[0007] The present invention overcomes the problems present in the prior art. That is, the technical problem to be solved by the present invention is to provide a coating die head flow rate adjusting mechanism and an operating method thereof that are rationally designed, effectively increase the flow rate adjustment accuracy and adjustment efficiency, and achieve stable coating quality.

[0008] To achieve the above object, the technical solution adopted by the present invention is a coating machine die head flow rate adjustment mechanism including a coarse adjustment mechanism, a fine adjustment mechanism, and a flow obstruction block, which are arranged in this order from top to bottom. The flow obstruction block is arranged above the slit to be coated, and an adjustment rod is erected at the center of the top surface. The fine adjustment mechanism is connected between the coarse adjustment mechanism and the adjustment rod.

[0009] Preferably, the fine adjustment mechanism includes a piezoelectric ceramic actuator that is vertically arranged and has an actuating end that abuts the middle of the top surface of the adjustment rod, and the coarse adjustment mechanism includes a first fixed seat to which a differential screw assembly is vertically attached, the moving end of which is connected to the upper end of the piezoelectric ceramic actuator.

[0010] Furthermore, the differential screw assembly includes a differential screw and a moving shaft, both of which are arranged vertically. The differential screw has a first screw portion and a second screw portion, which have the same spiral direction, arranged in order from top to bottom. The thread lead of the first screw portion is larger than the thread lead of the second screw portion. The first screw portion is threadably connected to a first fixed seat, and the second screw portion is threadably connected to the upper end of the moving shaft. The moving shaft and the first fixed seat are slidably fitted together vertically, and the lower end of the moving shaft is threadably connected to the upper end of the piezoelectric ceramic actuator.

[0011] Furthermore, a stop bolt is threadedly attached to the lower end of the first fixed seat, which is provided laterally, for locking the moving shaft, and an inverted L-shaped position restriction block is fixed to the side, with its horizontal edge positioned above the differential screw to restrict the position of the differential screw.

[0012] Furthermore, a repulsion mechanism having a second fixed seat is provided at the upper end of the adjustment rod to drive the adjustment rod to move upward, and the adjustment rod is slidably fitted into the second fixed seat via a vertical guide material, and a push plate connected to the adjustment rod is provided above the second fixed seat, and a pressure-receiving elastic material arranged vertically is in contact between the push plate and the second fixed seat.

[0013] Furthermore, the push plate is movably fitted onto the outside of the adjustment rod, with the top surface abutting against the adjustment nut screwed onto the adjustment rod, and the bottom surface abutting against the top of the pressure-receiving elastic material.

[0014] Furthermore, a contact type displacement sensor whose detection end abuts against the top surface of the push plate is provided vertically near the piezoelectric ceramic actuator.

[0015] Furthermore, the fine adjustment mechanism is used to be fixed to the upper die of the coating machine, and further includes a mounting frame having a horizontally arranged guide plate fixedly connected to its lower end and having the first fixing seat fixed to its top, and both the piezoelectric ceramic actuator and the contact-type displacement sensor are in sliding contact with the mounting frame in the vertical direction.

[0016] Furthermore, the flow obstruction block has a non-rectangular horizontal cross section, and the left and right sides are inclined relative to the vertical axis.

[0017] Another technical solution adopted by the present invention is the operating method of the coater die head flow rate adjustment mechanism. During operation, the differential screw is rotated, and the differential screw moves the piezoelectric ceramic actuator, the adjusting rod, and the flow obstruction block synchronously downward via the moving shaft, thereby realizing coarse adjustment. Then, the voltage output to the piezoelectric ceramic actuator is increased, and the piezoelectric ceramic actuator uses the adjusting rod to push the flow obstruction block to continue moving downward, thereby realizing fine adjustment. When the flow obstruction block needs to move upward, the differential screw is rotated in the opposite direction or the voltage output to the piezoelectric ceramic actuator is reduced, and the pressure-bearing elastic material uses its elastic force to push the adjusting rod and the flow obstruction block upward. [Effects of the Invention]

[0018] Compared with the prior art, the present invention has the following advantages: The design of the present invention is reasonable, using a differential screw structure to realize coarse adjustment and a piezoelectric ceramic actuator to realize fine adjustment, and the combination of coarse and fine adjustment not only effectively improves the flow rate adjustment accuracy and adjustment efficiency, but also stabilizes the coating quality and improves the coating uniformity. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a structural schematic diagram of a cross section of an embodiment of the present invention as seen from the front. [Figure 2] 1 is a schematic diagram of a three-dimensional structure of an embodiment of the present invention. [Figure 3] 1 is a schematic cross-sectional front view of a coarse adjustment mechanism according to an embodiment of the present invention; FIG. [Figure 4] FIG. 2 is a schematic diagram of a cross-sectional structure of a repulsion mechanism according to an embodiment of the present invention, as viewed from the front. [Figure 5] 1 is a schematic diagram of a three-dimensional structure of a repulsion mechanism according to an embodiment of the present invention. [Figure 6] 1 is a horizontal cross-sectional view of a flow impediment block according to an embodiment of the present invention; [Figure 7] 1 is a schematic diagram of a three-dimensional structure of a flow impediment block according to an embodiment of the present invention. [Figure 8] 1 is a structural schematic diagram of a plurality of flow obstruction blocks linked together according to an embodiment of the present invention; [Explanation of symbols]

[0020] 1 Upper die, 2 Lower die, 3 Gasket, 4 Coarse adjustment mechanism, 5 Fine adjustment mechanism, 6 Flow obstruction block, 601 Left side, 602 Right side, 603 Longitudinal axis, 604 Slit, 605 Front side, 606 Bottom, 7 Adjustment rod, 8 Piezoelectric ceramic actuator, 9 Actuating end, 10 First fixed seat, 11 Differential screw, 12 Moving axis, 13 First screw portion, 14 Second screw part, 15...first vertical screw hole, 16...vertical sliding hole, 17...second vertical screw hole, 18...position control step part, 19...lateral screw hole, 20...stop bolt, 21...position control block, 22...operation hole, 23...second fixing seat, 24...vertical guide material, 25...push plate, 26...pressure-receiving elastic material, 27...vertical through hole, 28...adjusting nut, 29...accommodating recess, 30...contact type displacement sensor, 31...mounting frame, 32...guide plate. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention will now be described in more detail with reference to the drawings and detailed description of the invention.

[0022] In describing the present invention, orientations or positional relationships indicated by terms such as "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are based on the orientations or positional relationships shown in the drawings, and are intended merely to facilitate the description of the present invention. It should be understood that these terms do not indicate or imply that the devices or elements referred to must have a particular orientation or be configured and operated in a particular orientation, and therefore should not be understood as limiting the present invention.

[0023] In this embodiment, the flow rate adjusting mechanism is used to adjust the discharge of coating fluid from a coating machine, which comprises a combined upper die 1 and lower die 2, with a gasket 3 interposed between the upper and lower dies, the thickness of the gasket being the width of the coating slit, a coating opening for discharging the coating fluid being provided at the front end of the gasket, and an adjustment long groove extending along the coating width direction being provided above the coating opening.

[0024] As shown in Figures 1 to 8, the coating machine die head flow rate adjustment mechanism of the present invention is installed in the upper die of a coating machine and includes, from top to bottom, a coarse adjustment mechanism 4, a fine adjustment mechanism 5, and a flow restriction block 6. The flow restriction block 6 is installed above the coating slit and within the adjustment groove of the upper die. An adjustment rod 7 is installed in the center of the top surface of the flow restriction block 6, and the fine adjustment mechanism 5 is connected between the coarse adjustment mechanism 4 and the adjustment rod 7. In use, the coarse adjustment mechanism drives the fine adjustment mechanism, the adjustment rod, and the flow restriction block to move synchronously along the vertical direction to achieve coarse adjustment. After the coarse adjustment mechanism finishes operating, the fine adjustment mechanism drives the adjustment rod and the flow restriction block to move synchronously along the vertical direction to achieve fine adjustment. The combination of coarse and fine adjustment effectively improves the accuracy of flow rate adjustment.

[0025] The die head flow rate adjusting mechanism of the coating machine may be attached to the upper die of the coating machine or the lower die of the coating machine. This embodiment takes the example of being attached to the upper die of the coating machine. When the entire adjusting mechanism is attached to the lower die, a flow obstruction block is provided in the lower die. The specific structure is the same as when it is attached to the upper die, and will not be described again here.

[0026] In this embodiment, the fine adjustment mechanism 5 includes a vertically disposed piezoelectric ceramic actuator 8, the actuating end 9 of which is hemispherical and abuts the center of the top surface of the adjustment rod 7 to form a point contact, and the coarse adjustment mechanism 4 includes a first fixed seat 10, to which a differential screw assembly is vertically attached, the moving end of which is connected to the upper end of the piezoelectric ceramic actuator 8. The differential screw structure realizes coarse adjustment, and the piezoelectric ceramic actuator realizes fine adjustment.

[0027] In this embodiment, as shown in FIG. 3 , the differential screw assembly includes a differential screw 11 and a moving shaft 12, both of which are vertically arranged. The differential screw 11 has a first screw portion 13 and a second screw portion 14, which are formed in the same spiral direction, in this order from top to bottom. The thread lead of the first screw portion 13 is larger than the thread lead of the second screw portion 14. The first screw portion 13 is threadedly connected to the first fixed seat 10, and the second screw portion 14 is threadedly connected to the upper end of the moving shaft 12. The moving shaft 12 and the first fixed seat 10 are fitted together in a vertical direction, and the lower end of the moving shaft 12 is threadedly connected to the upper end of the piezoelectric ceramic actuator 8. During operation, when the differential screw 11 is rotated, the first threaded portion 13 of the differential screw 11 moves downward relative to the first fixed seat 10, while the moving shaft 12 moves upward relative to the second threaded portion 14 of the differential screw 11, engaging with threads of two different pitches and converting circular rotation into linear motion due to the pitch difference. At this time, the distance traveled by the differential screw 11 downward and the distance traveled by the moving shaft 12 upward are combined, thereby achieving a small movement distance, increasing the resolution of coarse adjustment and making adjustment more precise. With higher precision, the sensitivity to the rotation angle of the differential screw can be reduced. The differential screw can be rotated manually by an operator or automatically by equipment. If it is rotated manually by an operator, this reduces the requirements on the operator and provides error-proofing protection for the operator.

[0028] In the differential screw assembly, the flow obstruction block and the upper die of the coater are slidably fitted together only in the vertical direction (i.e., can move only in the vertical direction), and the moving shaft is connected to the flow obstruction block via a piezoelectric ceramic actuator and an adjustment rod, so the moving shaft also only has the degree of freedom to move vertically and does not have the degree of freedom to rotate.

[0029] In this embodiment, for ease of assembly, a first vertical screw hole 15 for engaging with the first screw portion 13 is provided on the top surface of the first fixed seat 10, and a vertical sliding hole 16 is provided below the first vertical screw hole 15 so that the moving shaft 12 can slide only along the vertical sliding hole 16. A second vertical screw hole 17 for engaging with the second screw portion 14 is provided on the top surface of the moving shaft 12.

[0030] In this embodiment, in order to restrict the vertical movement of the moving shaft, a position restricting step 18 for restricting the position of the moving shaft is provided between the first vertical screw hole 15 and the vertical sliding hole 16.

[0031] In this embodiment, in order to facilitate fixing the moving shaft after moving vertically, a horizontal screw hole 19 communicating with the vertical sliding hole 16 is opened at the lower end of the first fixed seat 10, and a stop bolt 20 is screwed into the horizontal screw hole 19. The stop bolt is firmly abutted against the outer wall of the moving shaft, thereby locking the moving shaft so that it cannot move along the vertical sliding hole.

[0032] In this embodiment, in order to restrict the upward movement of the differential screw and prevent damage to the flow obstruction block due to excessive upward movement, an inverted L-shaped position restricting block 21 is fixed to the side of the first fixed seat 10, and the horizontal edge of the position restricting block 21 is located above the differential screw 11 and is used to abut against the top surface of the differential screw 11, thereby restricting the position of the differential screw.

[0033] In this embodiment, when an operator manually rotates the differential screw, a hexagonal operating hole 22 is provided on the top surface of the differential screw 11 to accommodate a hexagonal wrench, in order to facilitate rotation of the differential screw.

[0034] 4 and 5, to facilitate the automatic upward rebound of the adjusting rod, a rebound mechanism for driving the adjusting rod to move upward is provided at the upper end of the adjusting rod 7, the rebound mechanism including a second fixed seat 23, the adjusting rod 7 slidingly fitted into the second fixed seat 23 via a vertical guide member 24, a pressure plate 25 connected to the adjusting rod 7 is provided above the second fixed seat 23, and a vertical pressure-bearing elastic member 26 abuts between the pressure plate 25 and the second fixed seat 23. The flow obstruction block is automatically rebounded mechanically by elastic force, and the guide member precisely guides the vertical movement of the flow obstruction block, thereby realizing smooth automatic rebound of the flow obstruction block, reducing lateral errors and making jamming less likely to occur.

[0035] In this embodiment, the second fixed seat 23 is provided with a vertical through-hole 27 which is advantageous for the adjustment rod 7 to pass through in the vertical direction, and the vertical through-hole has a stepped hole structure with small hole diameters at both ends and a large hole diameter in the middle, and the vertical guide member 24 is mounted vertically in the middle hole portion of the vertical through-hole.

[0036] In this embodiment, the vertical guide member 24 can improve vertical guiding accuracy and reduce lateral movement. The vertical guide member 24 may, for example, be a ball bushing fitted to the outside of the adjusting rod 7. Ball bushings are an existing, mature product, also known as ball linear bearings, and their specific structure will not be described again here. The high precision of the ball bushing allows the flow obstruction block to precisely fit with the adjusting rod, achieving a fitting accuracy on the micron level. The ball bushing limits the lateral freedom of the flow obstruction block, ensuring that the flow obstruction block moves only in the intended direction (vertical direction).

[0037] In this embodiment, the upper end of the adjusting rod 7 is threaded, and the pressure plate 25 is movably fitted around the thread of the adjusting rod 7. An adjusting nut 28 threaded onto the thread of the adjusting rod 7 abuts the top of the pressure plate 25. There are two adjusting nuts 28, and the bottom of the pressure plate 25 abuts the top of the pressure-receiving elastic material 26. The pressure plate is supported by the combination of the pressure-receiving elastic material and the adjusting nut, which constantly exerts an upward force on the pressure plate, which transmits this force to the adjusting rod via the pressure-receiving elastic material. After the adjusting rod moves downward, this force automatically pushes the adjusting rod back upward. By turning the adjusting nut, the adjusting nut moves the pressure plate up and down, thereby adjusting the pressure level of the pressure-receiving elastic material and the upward elastic force of the pressure-receiving elastic material.

[0038] In this embodiment, a receiving recess 29 is provided on the top surface of the second fixed seat 23, and the bottom of the pressure-receiving elastic member 26 abuts against the bottom surface of the receiving recess.

[0039] In this embodiment, the pressure-receiving elastic member 26 may be, for example, a compression spring fitted onto the outside of the adjusting rod.

[0040] In this embodiment, to detect vertical displacement caused by the piezoelectric ceramic actuator 8 driving the flow obstruction block, a contact displacement sensor 30 is vertically installed near the piezoelectric ceramic actuator 8, with the detection end of the contact displacement sensor 30 abutting against the top surface of the push plate 25. Because the push plate moves in sync with the adjustment rod, the movement of the flow obstruction block and adjustment rod is detected by the contact displacement sensor via the push plate. The use of a contact displacement sensor makes it possible to detect displacement at the micron level.

[0041] In this embodiment, the fine adjustment mechanism further includes a mounting frame 31 for being fixed to the upper die 1 of the coating machine, and a horizontally disposed guide plate 32 is fixedly connected to the lower end of the mounting frame 31. The piezoelectric ceramic actuator and the contact-type displacement sensor are both in sliding contact with the guide plate 32 in the vertical direction, and the first fixed seat 10 is fixed to the top of the mounting frame 31.

[0042] In this embodiment, the actuating end 9 of the piezoelectric ceramic actuator 8 and the center of the top surface of the adjusting rod 7 form a point contact; that is, the piezoelectric ceramic actuator and the adjusting rod are separate structures, not rigidly connected. The deformation generated by the piezoelectric ceramic actuator after energizing drives the adjusting rod to move vertically, thereby adjusting the flow obstruction block. The flow obstruction block automatically rebounds mechanically due to the elastic force of the compressed spring. This, in combination with the piezoelectric ceramic actuator, can provide an automatic bias correction effect to the vertical movement of the flow obstruction block, and in combination with an advanced algorithm, can achieve high-frequency response.

[0043] 6 and 7, the horizontal cross section of the flow impediment block 6 is non-rectangular, the bottom surface 606 of the flow impediment block is flat, and the left side surface 601 and the right side surface 602 of the flow impediment block 6 are inclined relative to the vertical axis 603 of the flow impediment block 6. By designing the horizontal cross section of the flow impediment block to be non-rectangular, when two adjacent flow impediment blocks are connected, the gap between the two flow impediment blocks is inclined relative to the vertical direction. In this case, the gap does not directly penetrate in the vertical direction (the direction of flow of the coating fluid). In this case, the coating fluid cannot directly and quickly pass through the slit between the two flow impediment blocks in the vertical direction. This effectively reduces the flow rate of the coating fluid, shortens the straight-through distance of the fluid, prevents straight-through flow, and greatly reduces the risk of ribbing during coating.

[0044] In this embodiment, for convenience of processing, both the left side surface 601 and the right side surface 602 of the flow impediment block 6 are flat. The left and right side surfaces of the flow impediment block cooperate with the adjacent flow impediment blocks to form slits 604 through which the coating fluid passes, and these side surfaces may be inclined with respect to the vertical axis of the flow impediment block, thereby preventing the coating fluid from flowing directly and quickly in the vertical direction. In addition to being flat, these side surfaces may also have surfaces of other shapes, such as wavy surfaces or other irregular surfaces.

[0045] In this embodiment, for processing convenience, the front side 605 and rear side of the flow impediment block 6 are both flat, i.e., the horizontal cross section of the flow impediment block is rectangular. Preferably, the horizontal cross section of the flow impediment block is parallelogram-shaped. Simulation analysis shows that the slits between flow impediment blocks with parallelogram-shaped horizontal cross sections have a smaller impact on the fluid than the slits between rectangular flow impediment blocks, effectively reducing the risk of ribs.

[0046] In this embodiment, the flow obstruction block is manufactured in a one-piece process.

[0047] In this embodiment, the entire flow obstruction block has a diamond shape.

[0048] In this embodiment, when in use, the horizontal cross section of the flow impediment block is in the shape of a parallelogram, and both the left and right sides of the flow impediment block are inclined (i.e., inclined relative to the vertical axis of the flow impediment block). When several flow impediment blocks are arranged horizontally and spaced apart, as shown in Figure 8, the slits between adjacent flow impediment blocks are inclined relative to the vertical axis of the flow impediment block, and the coating liquid cannot pass directly and quickly through the inclined slits in the vertical direction. Instead, the straight-through distance of the coating liquid is smaller than the width of the flow impediment block, thereby reducing the straight-through distance. This reduces the outflow speed of the coating liquid, prevents it from flowing in a straight line, and effectively reduces the risk of ribs appearing.

[0049] In this embodiment, the piezoelectric ceramic actuator is a conventional technology, having a cylindrical structure, and the length of the piezoelectric ceramic actuator changes as the voltage applied to it increases or decreases, with the larger the voltage, the greater the expansion amount; however, the specific structure and control principle will not be described again here. The piezoelectric ceramic actuator of the present invention is directly driven, and increases or decreases the voltage applied to the piezoelectric ceramic actuator, causing it to expand or contract. This expansion amount pushes the flow obstruction block up or down slightly, achieving fine adjustment, with adjustment accuracy reaching the micron level and fast response speed. The direct-drive piezoelectric ceramic actuator has high rigidity and stable output, and can be well integrated with other structures, making it highly adaptable.

[0050] In specific terms, during operation, the differential screw 11 is rotated, causing the first thread 13 of the differential screw 11 to move downward relative to the first fixed seat 10, and the moving shaft 12 to move upward relative to the second thread 14 of the differential screw 11, using two different pitch threads to mesh together, and converting the circumferential rotation into linear motion through the pitch difference. At this time, the distance traveled downward by the differential screw 11 and the distance traveled upward by the moving shaft 12 are combined, thereby realizing a small distance of movement, improving the adjustment resolution and making the adjustment more accurate. At this time, the differential screw 11 drives the piezoelectric ceramic actuator 8, the adjusting rod 7 and the flow obstruction block 6 to move downward synchronously via the moving shaft 12, thereby realizing coarse adjustment. After that, the voltage output to the piezoelectric ceramic actuator 8 is increased, causing the piezoelectric ceramic actuator 8 to extend, which in turn pushes the adjusting rod 7 to continue moving downward to make fine adjustment. When the flow obstruction block needs to move upward, the differential screw 11 is rotated or the voltage output to the piezoelectric ceramic actuator 8 is reduced, and the compression spring uses its elastic force to push the adjusting rod 7 and flow obstruction block 6 upward, achieving the upward movement. Because the compression spring is always under pressure, even when not in operation, the elastic force causes the center of the top surface of the adjusting rod 7 to always abut against the actuating end 9 of the piezoelectric ceramic actuator 8, forming a point contact. Throughout the entire process, the differential screw structure drives the flow obstruction block 6 to move a large distance vertically (coarse adjustment), and then the voltage applied to the piezoelectric ceramic actuator 8 is increased, and the resulting micron-level extension is used to push the flow obstruction block 6 to move (fine adjustment), allowing the vertical adjustment of the flow obstruction block 6 to reach micron-level precision.The combination of coarse and fine adjustment not only greatly improves the adjustment accuracy, but also allows the ball bush to precisely guide the vertical movement of the adjustment rod, reducing the lateral deviation error during the adjustment rod's movement, reducing the frictional force experienced, and making it less likely to jam due to high resistance. The elastic force allows the flow obstruction block to automatically and smoothly rebound, and when combined with a piezoelectric ceramic actuator, it can achieve high-frequency response in conjunction with an advanced algorithm. When in use, fine adjustment is performed first to determine whether it meets the adjustment requirements. If it does, there is no need to perform coarse adjustment further; if it does not, coarse adjustment and fine adjustment can be combined.

[0051] Furthermore, the cost of piezoelectric ceramic actuators is high, and if only piezoelectric ceramic actuators are used to adjust the flow rate, a large-sized piezoelectric ceramic actuator would be required to achieve a wide adjustment range, resulting in a very high overall production cost.The present invention uses a differential screw structure as a coarse adjustment mechanism to achieve a wide adjustment range, and combines it with the high-precision fine adjustment of a piezoelectric ceramic actuator, thereby eliminating the need to use a large-sized piezoelectric ceramic actuator and greatly reducing production costs.

[0052] The advantages of the present invention are that it effectively improves the accuracy of flow rate adjustment, has a fast response speed for fine adjustment, has an automatic bias correction effect during the adjustment process, and can achieve high-frequency response in conjunction with an advanced algorithm, which reduces the impact of sudden changes in fluid flow rate during coating, effectively reduces the risk of ribbing, and makes coating more stable and uniform.Since the adjustment mechanism does not require a motor, the size of the flow obstruction block is small, the entire structure is compact, and the resolution of slit adjustment is improved.

[0053] Where the present invention discloses or refers to components or structural parts that are fixedly connected to one another, unless otherwise stated, what is fixedly connected may be understood as being detachably fixedly connected (e.g., connected by bolts or screws) or as being non-detachably fixedly connected (e.g., crimped, welded), and of course what is fixedly connected to one another may be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (unless it is clear that an integral molding process cannot be adopted).

[0054] Furthermore, unless otherwise stated, the terms used to indicate a positional relationship or shape applied to any technical solution disclosed in the present invention include states or shapes that are approximate, similar, or close to the same.

[0055] Any of the components of the present invention may be assembled from multiple individual components or may be a single piece manufactured by a one-piece molding process.

[0056] Finally, it should be understood that the above examples are only for explaining the technical solution of the present invention, and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art may still modify the modes for implementing the present invention or equivalently replace part of the technical features, and all of them should be included in the scope of the technical solution claimed by the present invention, without departing from the spirit of the technical solution of the present invention.

Claims

1. The nozzle includes a coarse adjustment mechanism, a fine adjustment mechanism, and a flow impediment block, which are provided in this order from top to bottom, the flow impediment block being provided above a slit to be coated, with an adjustment rod provided upright in the center of the top surface, and the fine adjustment mechanism being connected between the coarse adjustment mechanism and the adjustment rod; A repulsion mechanism having a second fixed seat is provided at the upper end of the adjustment rod to drive the adjustment rod to move upward, the adjustment rod is slidably fitted into the second fixed seat via a vertical guide member, a push plate connected to the adjustment rod is provided above the second fixed seat, and a pressure-receiving elastic member provided vertically is in contact between the push plate and the second fixed seat. A coating machine die head flow rate adjustment mechanism characterized by the above.

2. The fine adjustment mechanism includes a piezoelectric ceramic actuator that is vertically disposed and has an actuating end that abuts the center of the top surface of the adjustment rod, and the coarse adjustment mechanism includes a first fixed seat to which a differential screw assembly is vertically attached, the differential screw assembly having a moving end connected to the upper end of the piezoelectric ceramic actuator.

2. The die head flow rate adjusting mechanism for a coating machine according to claim 1.

3. the differential screw assembly includes a differential screw and a moving shaft, both of which are vertically arranged; the differential screw has a first screw portion and a second screw portion, which are spiraled in the same direction, and are arranged in this order from top to bottom; the thread lead of the first screw portion is larger than the thread lead of the second screw portion; the first screw portion is threadably connected to the first fixed seat; the second screw portion is threadably connected to an upper end of the moving shaft; the moving shaft and the first fixed seat are slidably fitted together in a vertical direction; and the lower end of the moving shaft is threadably connected to an upper end of the piezoelectric ceramic actuator.

3. The die head flow rate adjusting mechanism for a coating machine according to claim 2.

4. A stop bolt is threadedly attached to a lower end of the first fixed seat, the stop bolt being provided laterally to lock the moving shaft, and an inverted L-shaped position restricting block is fixed to a side surface of the first fixed seat, the horizontal edge of which is positioned above the differential screw and restricts the position of the differential screw.

4. The die head flow rate adjusting mechanism for a coating machine according to claim 3.

5. The pressure plate is movably fitted onto the outside of the adjustment rod, and the top surface of the pressure plate abuts against the adjustment nut screwed onto the adjustment rod, and the bottom surface of the pressure plate abuts against the top of the pressure-receiving elastic material.

2. The die head flow rate adjusting mechanism for a coating machine according to claim 1.

6. The fine adjustment mechanism includes a piezoelectric ceramic actuator that is vertically arranged, and a contact displacement sensor whose detection end abuts against the top surface of the push plate is vertically arranged near the piezoelectric ceramic actuator.

2. The die head flow rate adjusting mechanism for a coating machine according to claim 1.

7. The fine adjustment mechanism comprises a piezoelectric ceramic actuator arranged vertically, the coarse adjustment mechanism comprises a first fixed seat, the fine adjustment mechanism is used to be fixed to the upper die of a coating machine, a horizontally arranged guide plate is fixedly connected to the lower end, and a mounting frame to which the first fixed seat is fixed is further arranged at the top, and both the piezoelectric ceramic actuator and the contact type displacement sensor are slidably contacted to the mounting frame along the vertical direction.

2. The die head flow rate adjusting mechanism for a coating machine according to claim 1.

8. The flow obstruction block has a non-rectangular horizontal cross section, and the left and right sides are inclined relative to the vertical axis.

2. The die head flow rate adjusting mechanism for a coating machine according to claim 1.

9. The applicator die head flow rate adjusting mechanism according to any one of claims 1 to 8, wherein the fine adjustment mechanism comprises a piezoelectric ceramic actuator installed vertically, and a differential screw assembly connected to the upper end of the piezoelectric ceramic actuator comprises a differential screw and a moving shaft, both of which are installed vertically. During operation, the differential screw is rotated, and the differential screw moves the piezoelectric ceramic actuator, the adjusting rod, and the flow obstruction block downward synchronously via the moving shaft, thereby realizing coarse adjustment; Then, increasing the voltage output to the piezoelectric ceramic actuator, the piezoelectric ceramic actuator pushes the flow obstruction block downward through the adjusting rod to achieve fine adjustment; When the flow obstruction block needs to move upward, the differential screw is rotated in a reverse direction or the voltage output to the piezoelectric ceramic actuator is reduced, so that the pressure-receiving elastic material pushes the adjusting rod and the flow obstruction block to move upward by elastic force. A method for operating a die head flow rate adjusting mechanism of a coating machine, comprising:

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