Precise adjusting mechanism for flow of die head of coating machine

Abstract

The utility model relates to a precise adjusting mechanism for the flow of a die head of a coating machine. The precise adjusting mechanism for the flow of the die head of the coating machine comprises a coarse adjusting mechanism, a fine adjusting mechanism and a flow limiting block which are sequentially arranged from top to bottom, the flow limiting block is mounted above the die head coating slit; an adjusting rod is arranged in the middle of the top surface of the flow limiting block; a fine adjusting mechanism is connected above the adjusting rod, and a coarse adjusting mechanism is connected above the fine adjusting mechanism. According to the utility model, coarse adjustment and fine adjustment are combined, so that the flow adjustment precision and efficiency are improved, the coating uniformity is improved, and the coating quality is stable.

Description

Technical Field

[0001] The utility model relates to a precise regulating mechanism for the flow rate of a coating machine die head, belonging to the technical field of coating control. Background Art

[0002] When the coating die is coating, the coating thickness in its cross-sectional direction may vary, resulting in coating failure. The reason for this failure may be that the flow rate and pressure of the slurry are different when it enters the corresponding cross-sectional position. This failure has a huge difference in thickness. The pressure of the slurry in the cross-sectional direction can be made uniform by adjusting the slurry feeding process parameters. Another failure is caused by the circular runout of the back roller of the coating machine. The back roller of the coating machine is set on the outlet side of the lip of the die coating. The circumference of the back roller at different positions in the length direction has circular runout caused by the machining process of the back roller. The circular runout in the circumferential direction at different positions will slightly change the coating gap of the circumference at different positions, resulting in short-term minor abnormalities in the coating quality. One rotation of the back roller is one cycle. This failure is periodic, and the coating thickness change is small. Production can be maintained by adjusting the slurry flow of the coating die. After a production cycle, the back roller can be replaced or maintained. Downtime during the production cycle will cause huge economic losses. The loss of coating slurry during startup and shutdown, as well as the waste of coated paper, are all huge. In industry production, solving this kind of cyclical defects and non-conformities is a major issue.

[0003] At the same time, the unwinding speed of the paper to be coated is very fast, usually up to about 300ms per meter. If the coating of the banner is not adjusted to a qualified state in time, it will cause a lot of waste of coated paper and coating. However, how to accurately control the coating thickness in the banner direction during coating is difficult to achieve in the industry, and has become a pain point and difficult problem in the industry. Utility Model Content

[0004] In order to solve the above problems, the utility model discloses a precise adjustment mechanism for the flow rate of a coating machine die head, and its specific technical solution is as follows:

[0005] A precision adjustment mechanism for the flow rate of a coating machine die head, the coating machine closed-loop die head comprises an upper die head, a lower die head and a gasket, the gasket is located between the upper die head and the lower die head, the lower die head is provided with a slurry groove, the gap between the slurry groove and the lip of the upper die head and the lip of the lower die head is a coating slit, the gasket surrounds the outer side of the coating slit and the slurry groove, the coating machine closed-loop die head is provided with a plurality of flow rate precision adjustment mechanism units in the cross-sectional direction, each of the flow rate precision adjustment mechanism units comprises a coarse adjustment mechanism, a fine adjustment mechanism and a flow limiting block in sequence from top to bottom;

[0006] The bottom surface of the upper die head is provided with a groove for accommodating the current limiting block along the horizontal direction.

[0007] The upper die head is provided with channels along the horizontal direction, the number of which is the same as the number of the adjustment rods. The channels penetrate the upper die head from top to bottom, the lower end of the channels is connected to the channel, and each adjustment rod is inserted into a through hole;

[0008] The current limiting block is set in the groove on the bottom surface of the upper die head, located above the coating slit, and the middle of the top surface of the current limiting block is connected to the adjustment rod; the adjustment rod extends from the channel inside the upper die head to the top of the upper die head.

[0009] The fine adjustment mechanism comprises a vertically arranged piezoelectric ceramic actuator, the actuating end of the piezoelectric ceramic actuator is vertically downward and abuts against the middle of the top surface of the adjustment rod;

[0010] The coarse adjustment mechanism includes a motor, the moving end of the motor is connected to the upper end of the piezoelectric ceramic actuator;

[0011] The flow limiting blocks of all the flow precision adjustment mechanism units are closely spliced ​​end to end in sequence, and the length of all the flow limiting blocks after being spliced ​​end to end is consistent with the width length of the coating slit.

[0012] Furthermore, the coarse adjustment mechanism also includes a moving shaft, a drive plate and a fixed seat; the drive plate controls the rotational motion of the motor to convert it into up and down linear motion of the moving shaft; the up and down movement of the moving shaft is controlled by controlling the rotation angle of the motor; the lower end of the moving shaft is threadedly connected to the upper end of the piezoelectric ceramic actuator.

[0013] Furthermore, the driving board is energized to supply power to the motor coil, so that the motor rotates, a magnet is installed on the motor rotating shaft, and a magnetic pulse encoder is provided at the corresponding magnet position on the driving board, and the rotation angle of the motor is controlled by setting the number of pulses;

[0014] The motor rotating shaft is coaxially connected to the motor lead screw shaft, a lead screw nut sleeve is arranged at the lower end of the motor lead screw shaft, the movable shaft is coaxially connected to the lower end of the lead screw nut sleeve, and the motor lead screw shaft and the lead screw nut sleeve constitute a lead screw mechanism.

[0015] Furthermore, the fine adjustment mechanism also includes a mounting frame fixed above the upper die head.

[0016] The mounting frame includes a vertical side plate and a top plate horizontally fixed to one side of the top of the side plate, the fixing seat of the coarse adjustment mechanism is installed above the top plate of the mounting frame, the moving shaft passes through the top plate, and the piezoelectric ceramic actuator is located vertically below the top plate and parallel to the side plate;

[0017] A horizontal guide plate is arranged vertically below the top plate of the mounting frame. The piezoelectric ceramic actuator and the contact displacement sensor vertically penetrate the guide plate. The piezoelectric ceramic actuator can slide vertically in the through hole of the guide plate. The contact displacement sensor is fixedly connected to the guide plate.

[0018] Furthermore, a rebound mechanism for moving the adjusting rod upward is provided at the upper end of the adjusting rod, and the rebound mechanism includes a vertical guide, a vertical guide fixing seat, a pressure-bearing elastic member, a pressure plate and an adjusting nut; the vertical guide can be slidably sleeved in the vertical guide fixing seat, the pressure-bearing elastic member is sleeved around the adjusting rod and is located above the vertical guide, the pressure plate is located above the pressure-bearing elastic member, and the top of the adjusting rod passes through the pressure plate and is in contact with the actuating end of the piezoelectric ceramic actuator; the adjusting nut is tightened and connected to the outside of the adjusting rod and is pressed above the pressure plate;

[0019] The vertical guide member fixing seat is embedded and fixed in the upper die head.

[0020] Furthermore, the vertical guide fixing seat comprises an upper fixing seat and a lower fixing seat, the cross section of the upper fixing seat is larger than the cross section of the lower fixing seat, and the position where the cross section of the upper fixing seat exceeds the lower fixing seat is provided with one or more bolt countersunk holes, which are connected by bolts through the bolt countersunk holes and screwed into the upper die head to fix the vertical guide fixing seat in the upper die head;

[0021] A fixing seat countersunk hole is opened on the upper surface of the channel of the upper die head, and the vertical guide member fixing seat is arranged in the fixing seat countersunk hole. The upper fixing seat is located in the upper hole of the fixing seat countersunk hole, and the lower fixing seat is located in the lower hole of the fixing seat countersunk hole.

[0022] Furthermore, the pressing plate is fixedly connected to the adjusting rod, and the detection rod of the contact displacement sensor abuts against the top surface of the pressing plate; when the adjusting rod moves, the pressing plate moves up and down against the detection rod of the contact displacement sensor to measure the moving distance.

[0023] Furthermore, a seal mounting seat is arranged on the lower surface of the lower fixed seat, and a seal is fixed to the lower surface of the seal mounting seat by bolts, and the seal surrounds the adjusting rod. Two or more sealing rings are arranged around the adjusting rod near the lower end.

[0024] The specific process of coarse adjustment during the use of the utility model is:

[0025] After locating the current limiting block, start the drive board corresponding to the current limiting block, give the drive board the corresponding number of pulses, control the rotation angle and direction of the motor, start the motor, drive the motor's rotating shaft and the motor's lead screw shaft to rotate coaxially, and the motor's lead screw shaft drives the lead screw nut sleeve to move up / down along the motor's lead screw shaft; when it is periodic adjustment, the drive board adjusts the current limiting block up / down at a fixed period, and after the adjustment is completed, the drive board gives the motor a pulse to control the motor's rotation angle and direction to return to the initial position;

[0026] The specific process of fine adjustment is as follows: when the piezoelectric ceramic actuator receives a downward adjustment signal, the actuating end of the piezoelectric ceramic actuator moves downward, pressing the adjustment rod to move downward. After the adjustment is completed, the piezoelectric ceramic actuator resets, the compressed elastic part rebounds upward, pushing the pressure plate upward, and at the same time, the adjustment rod also moves upward.

[0027] The utility model is used to overcome the process of adjusting the circular runout of the back roller of the coating machine:

[0028] Step 1: Set up an area density measuring instrument downstream of the die head of the coater. The area density measuring instrument continuously collects coating quality data and feeds it back to the control system;

[0029] Step 2: The control system analyzes and compares the measured data to determine whether there is any abnormal data in the coating;

[0030] Step 3: If there is abnormal data, determine whether the coating abnormal data is periodic and is related to the coating roller cycle;

[0031] Step 4: The control system determines that the back roller of the coating machine is running out;

[0032] Step 5: Compare the data collected by the surface density meter to determine whether it is within the automatic adjustment threshold range;

[0033] Step 6: If the threshold is exceeded, the motor will be roughly adjusted or stopped for inspection;

[0034] Step 7: Within the threshold range, calculate the position, displacement, and adjustment duration of the current limiting block that needs to be adjusted, and the control system sends instructions to the piezoelectric ceramic actuator for fine adjustment;

[0035] Step 8: The control system records the adjustment position, adjustment amount, adjustment duration, and adjustment cycle, and continuously repeats the above adjustment actions according to the adjustment cycle;

[0036] Step 9: The piezoelectric ceramic actuator completes the pressing or lifting action according to the command, and periodically repeats the adjustment action;

[0037] Step 10: The surface density measuring instrument continuously measures the coating data and feeds back to the control system;

[0038] Step 11: The control system analyzes and compares the measured data;

[0039] Step 12: The back roller of the coating machine is not oscillating, so repeat the adjustment action;

[0040] Step 13: The back roller circle runout of the coating machine is solved and the adjustment is completed.

[0041] The beneficial effects of the utility model are:

[0042] The cost of piezoelectric ceramic actuators is relatively high. If only piezoelectric ceramic actuators are used to achieve flow regulation, the piezoelectric ceramic actuators will be too large and costly when adjusting a large displacement of the adjusting rod. A drive plate is used to achieve coarse adjustment of a large displacement of the adjusting rod, and a piezoelectric ceramic actuator is used to achieve fine adjustment of a small displacement of the adjusting rod, thereby reducing costs.

[0043] The circular jump of the back roller of the coater brings about short-periodic micro-abnormalities in the coating quality, which has the characteristics of small jump amount and short jump period (usually around 300ms). The piezoelectric ceramic actuator can achieve precise adjustment of the adjustment rod with small displacement, high adjustment accuracy and fast response; it can effectively improve the flow adjustment accuracy; the coating is more stable and uniform.

[0044] The traditional coarse adjustment mechanism consists of a differential thread manual adjustment mechanism. The utility model realizes the coarse adjustment mechanism by controlling the linear motion of the moving shaft through the rotation of the motor; the differential screw adjustment process relies on the operator's experience; the drive plate can realize the rotation of the motor through electrical control to realize the coarse adjustment of the automatic adjustment rod moving up and down; the dependence on the operator's experience is reduced, and automatic closed-loop coarse adjustment can be realized by measuring the up and down displacement feedback of the adjustment rod through a contact displacement sensor; the piezoelectric ceramic actuator realizes the fine adjustment of the up and down movement of the adjustment rod.

[0045] The coarse and fine adjustments are automatically closed-loop controlled by measuring the up and down movement of the adjustment rod through a contact displacement sensor, reducing the dependence on the operator's experience.

[0046] In actual use, the utility model sets a coater back roller on the discharge port side of the lip of the die head coating. The circumference of different positions in the length direction of the back roller has circular runout caused by the machining process of the back roller, which causes short-periodic minor anomalies in the coating quality. One rotation of the back roller is one cycle. A displacement sensor is set downstream of the coater back roller to measure the circumference runout of different positions in the length direction of the back roller. It is measured that the circular runout of the coater back roller causes short-periodic minor anomalies in the coating quality. Combined with the coating closed-loop algorithm and control system, the synchronous piezoelectric ceramic actuator is quickly and precisely adjusted to improve the flow regulation accuracy, and the coating is more stable and uniform.

[0047] The utility model provides a sealing ring on the fixing seat mechanism of the vertical guide member to prevent slurry from flowing through the vertical guide member, thereby preventing the mechanism of the vertical guide member from being corroded and damaged; the vertical guide member is secondarily protected to prevent the slurry from being corroded and damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is an overall schematic diagram of the application state of the utility model.

[0049] Figure 2 It is a vertical cross-sectional structural schematic diagram of the utility model.

[0050] Figure 3 It is a schematic diagram of the coarse adjustment mechanism of the utility model.

[0051] Figure 4 It is a cross-sectional schematic diagram of the coarse adjustment mechanism of the utility model.

[0052] Figure 5 It is a vertical cross-sectional structural diagram of the fine adjustment mechanism of the utility model.

[0053] Figure 6 It is a three-dimensional schematic diagram of the fine adjustment mechanism of the utility model.

[0054] Figure 7 It is a three-dimensional schematic diagram of the current limiting block and the adjusting rod of the utility model.

[0055] Figure 8 This is an exploded view of the utility model.

[0056] List of reference numerals: 1-upper die head; 2-gasket; 3-lower die head; 4-motor; 5-fixed seat; 6-piezoelectric ceramic actuator; 7-guide plate; 8-mounting frame; 81-side plate; 82-top plate; 9-current limiting block; 10-adjusting rod; 11-moving shaft; 12-seal mounting seat; 13-seal; 14-lower fixed seat; 15-vertical guide; 16-upper fixed seat; 17-pressure elastic member; 18-adjusting nut; 19-actuating end of piezoelectric ceramic actuator; 20-pressure plate; 21-contact displacement sensor; 211-detection rod; 22-driving plate; 23-coarse adjustment mechanism; 24-fine adjustment mechanism; 25-sealing ring; 26-magnet; 27-motor rotating shaft; 28-magnetic pulse encoder; 29-motor lead screw shaft; 30-screw nut sleeve; 31-fixed seat countersunk hole. DETAILED DESCRIPTION

[0057] The present invention is further described below in conjunction with the accompanying drawings and specific implementations. It should be understood that the following specific implementations are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0058] Combined with Figure 1 and 2 It can be seen that the closed-loop die of the coating machine includes an upper die 1, a lower die 3 and a gasket 2, the gasket 2 is located between the upper die 1 and the lower die 3, the lower die 3 is provided with a slurry groove, the gap between the slurry groove and the lips of the upper die 1 and the lower die 3 is the coating slit, the gasket 2 surrounds the outer side of the coating slit and the slurry groove, the gasket 2 is not just padded in the coating slit, the thickness of the gasket 2 is the height of the coating slit, and the coating slit is the channel for the slurry spray to flow through.

[0059] The closed-loop die head of the coating machine is provided with several flow precision adjustment mechanism units in the horizontal direction, and each flow precision adjustment mechanism unit includes a coarse adjustment mechanism, a fine adjustment mechanism and a flow limiting block from top to bottom; the flow limiting block is arranged in the upper die head, above the coating slit, and the flow of the slurry flowing through the coating slit is limited by raising and lowering the flow limiting block.

[0060] Combined with Figure 7 It can be seen that the middle of the top surface of the current limiting block 9 is connected to an integrated adjustment rod 10; the adjustment rod 10 extends from the inside of the upper die head 1 to the top of the upper die head 1, the top of the adjustment rod 10 is connected to the fine adjustment mechanism, and the top of the fine adjustment mechanism is connected to the coarse adjustment mechanism. The current limiting block is adjusted by the coarse adjustment mechanism and the fine adjustment mechanism. The coarse adjustment mechanism and the fine adjustment mechanism are activated by setting a threshold. When the adjustment height is greater than the threshold, the coarse adjustment mechanism is first adjusted to below the threshold, and then the fine adjustment mechanism is used for precise adjustment, which saves costs and responds quickly.

[0061] The flow limiting blocks of all the flow precision regulating mechanism units are closely spliced ​​and arranged end to end in sequence to form a complete flow limiting wall.

[0062] A groove for installing a current limiting block is provided near the coating slit of the upper die head. The height of the groove is greater than the height of the current limiting block and serves as a lifting space margin for the current limiting block.

[0063] The upper die head is provided with channels along the horizontal direction, the number of which is the same as that of the adjusting rods. The channels penetrate the upper die head from top to bottom, the lower ends of the channels are connected to the grooves, and each adjusting rod is inserted in a through hole.

[0064] The current limiting block is arranged in the groove on the bottom surface of the upper die head, and is located above the coating slit. The middle of the top surface of the current limiting block is connected to the adjusting rod; the adjusting rod extends from the channel inside the upper die head to the top of the upper die head.

[0065] Combined with Figure 3 and 4 It can be seen that the coarse adjustment mechanism 23 includes a driving plate 22, a motor 4, a fixing seat 5, a moving shaft 11, and a motor 4; Figure 5 and 6 It can be seen that the fine adjustment mechanism 24 includes a piezoelectric ceramic actuator 6, a mounting frame 8 fixed on the upper die head, and a guide plate 7; the mounting frame 8 includes a vertical side plate 81 and a top plate 82 fixed horizontally on one side of the top of the side plate, the fixing seat 5 of the coarse adjustment mechanism is installed above the top plate of the mounting frame 8, the moving shaft 11 passes through the top plate 82, and the piezoelectric ceramic actuator 6 is located vertically below the top plate 82 and parallel to the side plate 81. The moving shaft 11 at the lower end of the coarse adjustment mechanism 23 is threadedly connected to the upper end of the piezoelectric ceramic actuator 6; the actuating end 19 of the piezoelectric ceramic actuator of the fine adjustment mechanism 24 is in contact with the top surface of the adjustment rod 10.

[0066] The piezoelectric ceramic actuator 6 and the contact displacement sensor 21 are vertically slidably connected to the horizontally arranged guide plate 7 .

[0067] The upper end of the adjusting rod 10 is provided with a rebound mechanism for moving the adjusting rod 10 upward, and the rebound mechanism includes a vertical guide 15, an upper fixing seat 16, a lower fixing seat 14, a pressure elastic member 17, a pressure plate 20, and an adjusting nut 18; the vertical guide 15 is slidably matched with the vertical guide fixing seat; a pressure plate 20 connected to the adjusting rod 10 is provided above the vertical guide fixing seat; a vertically arranged pressure elastic member 17 is abutted between the pressure plate 20 and the vertical guide fixing seat. The adjusting rod 10 is fixed in a contact manner in the entire mechanism, and is fixed in a non-rigid locking manner. The role of the vertical guide 15 is to guide the adjusting rod 10, to ensure that the adjusting rod 10 moves along the ideal central axis during the up and down movement, without deviation or tilt, and to ensure the up and down movement accuracy.

[0068] The cross section of the upper fixing seat is larger than that of the lower fixing seat. The position where the cross section of the upper fixing seat exceeds the lower fixing seat is provided with one or more bolt countersunk holes. The vertical guide fixing seat is fixed in the upper die head by connecting the bolts through the bolt countersunk holes and screwing them into the upper die head.

[0069] Combination Figure 8 It can be seen that a fixing seat countersunk hole 31 is opened on the upper surface of the channel of the upper die head, and the vertical guide member fixing seat is arranged in the fixing seat countersunk hole 31. The upper fixing seat is located in the upper hole of the fixing seat countersunk hole 31, and the lower fixing seat is located in the lower hole of the fixing seat countersunk hole.

[0070] The pressing plate 20 is installed on the outside of the adjusting rod 10 , an adjusting nut 18 threadedly connected to the adjusting rod 10 is installed on the top surface of the pressing plate 20 , and a pressure-bearing elastic member 17 is installed on the bottom surface of the pressing plate 20 .

[0071] A contact displacement sensor 21 is installed on the outside of the piezoelectric ceramic actuator 6. The detection rod 211 of the contact displacement sensor 21 is in contact with the top surface of the pressure plate 20. The contact displacement sensor 21 can feedback the up and down movement distance of the coarse adjustment rod 10 and the current limiting block 9 during coarse adjustment; and can feedback the up and down movement distance of the fine adjustment rod 10 and the current limiting block 9 during fine adjustment.

[0072] The principle of the drive plate 22 controlling the rotational motion of the motor 4 to convert it into the up and down linear motion of the moving shaft 44 is as follows: the drive plate 22 is energized to supply power to the motor coil, causing the motor to rotate, a magnet 26 is mounted on the motor rotating shaft 27, and a magnetic pulse encoder 28 is provided at the corresponding magnet position on the drive plate 22, and the rotation angle of the motor is controlled by setting the number of pulses. The motor rotating shaft 27 is coaxially connected to the motor lead screw shaft 29, and a lead screw nut sleeve 30 is provided at the lower end of the motor lead screw shaft 29, and the moving shaft 11 is coaxially connected to the lower end of the lead screw nut sleeve 30, and the motor lead screw shaft 29 and the lead screw nut sleeve 30 constitute a lead screw mechanism.

[0073] When the current limiting block 9 is pressed down for adjustment, the current limiting block 9 needs to move downward. The rotation angle of the motor 4 is controlled by the software program, and the moving shaft 11 is controlled to move downward according to the specified distance. The moving shaft 11 drives the piezoelectric ceramic actuator 6, the adjusting rod 10, and the current limiting block 9 to move downward synchronously, and the flow rate at the position of the current limiting block 9 corresponding to the slit width direction is adjusted to achieve coarse adjustment; the voltage is synchronously output to the piezoelectric ceramic actuator 6, and the actuating end 19 of the piezoelectric ceramic actuator pushes the adjusting rod 10 and the current limiting block 9 to continue to move downward, so as to compensate for the flow rate difference caused by the circular runout in the length direction of the back roller of the coater, and achieve fine adjustment.

[0074] When the current limiting block 9 is lifted for adjustment, the current limiting block 9 needs to move upward, and the software program controls the reverse rotation angle of the motor 4 to control the moving shaft 11 to move upward according to the specified distance to achieve coarse adjustment; the voltage output to the piezoelectric ceramic actuator 6 is simultaneously reduced to move the actuating end 19 of the piezoelectric ceramic actuator upward; at this time, the pressure elastic member 17 uses the elastic force to push the adjusting rod 10 and the current limiting block 9 upward to compensate for the flow difference caused by the circular runout in the length direction of the back roller of the coater, thereby achieving fine adjustment.

[0075] A seal mounting seat 12 is arranged on the lower surface of the lower fixing seat, and a seal 13 is fixed to the lower surface of the seal mounting seat 12 by bolts. The seal 13 surrounds the adjusting rod 10, and more than two sealing rings 25 are arranged around the adjusting rod 10 near the lower end.

[0076] The term “connection” as used in this application may mean a direct connection between components or an indirect connection between components via other components.

[0077] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A precise adjustment mechanism for the flow rate of a coating machine die head, the coating machine die head comprises an upper die head, a lower die head and a gasket, the gasket is located between the upper die head and the lower die head, the lower die head is provided with a slurry groove, the gap between the slurry groove and the lip of the upper die head and the lip of the lower die head is a coating slit, the gasket surrounds the outer side of the coating slit and the slurry groove, characterized in that, The closed-loop die head of the coating machine is provided with a plurality of flow precision adjustment mechanism units in the horizontal direction, and each of the flow precision adjustment mechanism units comprises, from top to bottom, a coarse adjustment mechanism (23), a fine adjustment mechanism (24), an adjustment rod (10) and a flow limiting block (9); The bottom surface of the upper die head is provided with a groove for accommodating the current limiting block along the horizontal direction. The upper die head is provided with channels along the horizontal direction, the number of which is the same as that of the adjustment rods. The channels penetrate the upper die head from top to bottom, the lower ends of the channels are connected to the grooves, and each adjustment rod (10) is inserted into a through hole. The current limiting block (9) is arranged in a groove on the bottom surface of the upper die head, and is located above the coating slit. The middle of the top surface of the current limiting block (9) is connected to an adjustment rod (10). The adjustment rod (10) extends from the channel inside the upper die head to the top of the upper die head. The top of the adjustment rod (10) is connected to a fine adjustment mechanism (24), and the top of the fine adjustment mechanism (24) is connected to a coarse adjustment mechanism (23). The fine adjustment mechanism (24) comprises a vertically arranged piezoelectric ceramic actuator (6), wherein the actuating end of the piezoelectric ceramic actuator (6) faces vertically downward and abuts against the middle of the top surface of the adjustment rod (10); The coarse adjustment mechanism (23) comprises a motor (4), a movable shaft (11), a drive plate (22) and a fixed seat (5); the movable end of the motor (4) is connected to the upper end of the piezoelectric ceramic actuator (6); the drive plate (22) controls the rotational motion of the motor (4) to be converted into the up and down linear motion of the movable shaft (11); the up and down movement amount of the movable shaft (11) is controlled by controlling the rotation angle of the motor (4); the lower end of the movable shaft (11) is threadedly connected to the upper end of the piezoelectric ceramic actuator (6); The flow limiting blocks (9) of all the flow precision adjustment mechanism units are closely spliced ​​end to end in sequence, and the length of all the flow limiting blocks (9) after being spliced ​​end to end is consistent with the width length of the coating slit.

2. The precise adjustment mechanism for the flow rate of the coating machine die head according to claim 1, characterized in that: The driving plate (22) is energized to supply power to the motor coil, causing the motor to rotate. A magnet (26) is mounted on the motor rotating shaft (27). A magnetic pulse encoder (28) is provided at a position corresponding to the magnet on the driving plate (22). The rotation angle of the motor is controlled by setting the number of pulses. The motor rotating shaft (27) is coaxially connected to the motor screw shaft (29); a screw nut sleeve (30) is provided at the lower end of the motor screw shaft (29); the moving shaft (11) is coaxially connected to the lower end of the screw nut sleeve (30); the motor screw shaft (29) and the screw nut sleeve (30) form a screw mechanism.

3. The precise adjustment mechanism for the flow rate of the coating machine die head according to claim 1, characterized in that: The fine adjustment mechanism also includes a mounting frame (8) fixed above the upper die head. The mounting frame (8) comprises a vertical side plate (81) and a top plate (82) fixed horizontally on one side of the top of the side plate, the fixing seat (5) of the coarse adjustment mechanism is installed above the top plate of the mounting frame (8), the moving shaft (11) passes through the top plate (82), and the piezoelectric ceramic actuator (6) is located vertically below the top plate (82) and parallel to the side plate (81); A horizontal guide plate (7) is arranged vertically below the top plate (82) of the mounting frame (8); the piezoelectric ceramic actuator (6) and the contact displacement sensor (21) vertically penetrate the guide plate (7); the piezoelectric ceramic actuator (6) can slide vertically in the through hole of the guide plate (7); and the contact displacement sensor (21) is fixedly connected to the guide plate (7).

4. The precise adjustment mechanism for the flow rate of the coating machine die head according to claim 1, characterized in that: The upper end of the adjusting rod (10) is provided with a rebound mechanism for moving the adjusting rod (10) upward, and the rebound mechanism comprises a vertical guide member (15), a vertical guide member fixing seat, a pressure-bearing elastic member (17), a pressure plate (20) and an adjusting nut (18); the vertical guide member (15) is slidably sleeved in the vertical guide member fixing seat, the pressure-bearing elastic member (17) is sleeved around the adjusting rod (10) and is located above the vertical guide member (15), the pressure plate (20) is located above the pressure-bearing elastic member (17), and the top of the adjusting rod (10) passes through the pressure plate (20) and is abutted against the actuating end of the piezoelectric ceramic actuator (6); the adjusting nut (18) is tightened and connected to the outside of the adjusting rod (10) and is pressed above the pressure plate (20); The vertical guide member fixing seat is embedded and fixed in the upper die head.

5. The precise adjustment mechanism for the flow rate of the coating machine die head according to claim 4, characterized in that: The vertical guide member fixing seat comprises an upper fixing seat (16) and a lower fixing seat (14); the cross section of the upper fixing seat (16) is larger than the cross section of the lower fixing seat (14); a position where the cross section of the upper fixing seat (16) exceeds the lower fixing seat (14) is provided with one or more bolt countersunk holes, and the vertical guide member fixing seat is fixed in the upper die head by bolts connected through the bolt countersunk holes and screwed into the upper die head; A fixing seat countersunk hole is provided on the upper surface of the channel of the upper die head, the vertical guide fixing seat is arranged in the fixing seat countersunk hole, the upper fixing seat (16) is located in the upper hole of the fixing seat countersunk hole, and the lower fixing seat (14) is located in the lower hole of the fixing seat countersunk hole.

6. The precise adjustment mechanism for the flow rate of the coating machine die head according to claim 4, characterized in that: The pressing plate (20) is fixedly connected to the adjusting rod (10), and the detection rod (211) of the contact displacement sensor (21) is in contact with the top surface of the pressing plate (20); when the adjusting rod (10) moves, the pressing plate (20) moves up and down against the detection rod (211) of the contact displacement sensor (21) to measure the moving distance.

7. The precise adjustment mechanism for the flow rate of the coating machine die head according to claim 5, characterized in that: A sealing member mounting seat (12) is arranged on the lower surface of the lower fixing seat, a sealing member (13) is fixed to the lower surface of the sealing member mounting seat (12) by bolt connection, the sealing member (13) surrounds the adjusting rod (10), and two or more sealing rings (25) are arranged around the adjusting rod (10) near the lower end.

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