CN216678889U

CN216678889U - Flow adjusting mechanism for die head of coating machine

Info

Publication number: CN216678889U
Application number: CN202122398634.5U
Authority: CN
Inventors: 马天行; 朱思奇; 黄允强; 夏光荣
Original assignee: Anmai Times Intelligent Manufacturing Ningde Co ltd
Current assignee: Anmai Times Intelligent Manufacturing Ningde Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-06-07
Anticipated expiration: 2031-09-30

Abstract

The utility model relates to a flow regulating mechanism of a die head of a coating machine, which comprises a coarse regulating mechanism, a fine regulating mechanism and a flow blocking block, wherein the coarse regulating mechanism, the fine regulating mechanism and the flow blocking block are sequentially arranged from top to bottom; the fine adjustment mechanism is connected between the coarse adjustment mechanism and the adjusting rod. The fine adjustment mechanism comprises a vertically arranged piezoelectric ceramic actuator, and the actuating end of the piezoelectric ceramic actuator is abutted against the middle part of the top surface of the adjusting rod; the coarse adjustment mechanism comprises a first fixed seat, a differential threaded component is vertically installed on the first fixed seat, and the moving end of the differential threaded component is connected with the upper end of the piezoelectric ceramic actuator. The utility model has reasonable design, realizes coarse adjustment by utilizing a differential thread structure and fine adjustment by utilizing a piezoelectric ceramic actuator, and combines the coarse adjustment and the fine adjustment, thereby not only effectively improving the flow regulation precision and the regulation efficiency, but also having stable coating quality and improving the coating uniformity.

Description

Flow adjusting mechanism for die head of coating machine

The technical field is as follows:

the utility model relates to a flow regulating mechanism for a die head of a coating machine.

Background art:

the slot coating is a coating technology which extrudes coating liquid along a slot of a coating die head and transfers the coating liquid to a moving substrate under certain pressure, has the characteristics of high coating speed, good coating uniformity, wide coating window and the like, and is widely applied to coating of lithium ion battery pole pieces.

At present, the slit extrusion type coating die head mainly realizes the slit gap adjustment process through three modes of bolt adjustment, micrometer adjustment or motor adjustment. Micrometer adjustment or motor adjustment utilizes rigid coupling to connect the differential head with the regulating block rigid, adjusts control slit clearance through rotatory differential head or control motor rotation.

The mode of adjusting and controlling the slit gap by the bolt is that the bolt is screwed down to apply acting force to the upper die lip or the lower die lip to deform the upper die lip or the lower die lip, so that the slit gap between the upper die and the lower die is changed. The bolt adjusting mode has obvious effect at the initial stage of equipment use, but the adjustment is difficult due to the failure of lip deformation after the equipment is used for a period of time. Due to the defects of abrasion, deformation, clamping stagnation and the like of the thread of the bolt, the coating process cannot be quickly adjusted, and the gap of the slit cannot be accurately controlled; and the bolt adjusting process is seriously dependent on the experience of operators, and the adjustment has hysteresis.

The mode that the slit clearance is adjusted and controlled to the micrometer means that a structure similar to a micrometer is utilized, an extension rod of the micrometer is connected with a connecting rod through a coupler, the connecting rod is connected with an adjusting sheet, the adjusting sheet is controlled to ascend or descend by screwing a micrometer differential head by an operator, and the slit clearance between an upper die and a lower die is changed. The micrometer is adjusted to have scale value display, and the slit gap adjusting and controlling precision is high; however, the adjustment process depends on the experience of operators, the adjustment has the problem of hysteresis, and the risk of failure of the areal density control exists.

The mode that the motor controls the slit gap refers to that the output end of the motor is connected with a regulating sheet through a coupler and a connecting rod, the motor automatically regulates the slit gap through a feedback signal of system monitoring surface density data, the regulation and control speed is high, and the regulation precision depends on closed-loop control of the feedback signal. The stroke error is caused by the creeping phenomenon of the motor in the high-resolution control, and the response speed is slow, so that the optimal control of the consistency of the coating surface density is not facilitated; and the size of the motor is large, so that the size of the corresponding adjusting block is also large, and the resolution of slit adjustment is poor.

The utility model has the following contents:

the utility model aims to solve the problems in the prior art, namely the utility model aims to provide a flow regulating mechanism of a die head of a coating machine, which has reasonable design, effectively improves the flow regulating precision and regulating efficiency and has stable coating quality.

In order to achieve the purpose, the utility model adopts the technical scheme that: a flow regulating mechanism of a die head of a coating machine comprises a coarse regulating mechanism, a fine regulating mechanism and a flow blocking block which are sequentially arranged from top to bottom, wherein the flow blocking block is arranged above a coating slit, and the middle part of the top surface of the flow blocking block is provided with a regulating rod; the fine adjustment mechanism is connected between the coarse adjustment mechanism and the adjusting rod.

Furthermore, the fine adjustment mechanism comprises a vertically arranged piezoelectric ceramic actuator, and the actuating end of the piezoelectric ceramic actuator is abutted against the middle part of the top surface of the adjusting rod; the coarse adjustment mechanism comprises a first fixed seat, a differential threaded component is vertically installed on the first fixed seat, and the moving end of the differential threaded component is connected with the upper end of the piezoelectric ceramic actuator.

Furthermore, the differential screw assembly comprises a differential screw and a moving shaft which are vertically arranged, the differential screw is sequentially provided with a first screw section and a second screw section which have the same rotation direction from top to bottom, the screw lead of the first screw section is greater than that of the second screw section, and the first screw section is in threaded connection with the first fixed seat; the second thread section is in threaded connection with the upper end of a moving shaft, the moving shaft is in vertical sliding fit with the first fixed seat, and the lower end of the moving shaft is in threaded connection with the upper end of the piezoelectric ceramic actuator.

Furthermore, the lower end of the first fixing seat is connected with a transversely-arranged stop bolt for locking the movable shaft in a threaded manner, an inverted L-shaped limiting block is fixed on the side face of the first fixing seat, and the horizontal edge of the limiting block is positioned on the upper side of the differential screw to limit the differential screw.

Further, the upper end of adjusting the pole is equipped with and is used for the drive to adjust the resilience mechanism of pole rebound, resilience mechanism includes the second fixing base, adjust the pole through vertical guide and second fixing base sliding fit, the top of second fixing base is equipped with the clamp plate that is connected with the regulation pole, the butt has the pressure elastic component of vertical setting between clamp plate and the second fixing base.

Furthermore, the clamp plate movable sleeve is established in the outside of adjusting the pole, and the top surface butt of clamp plate has been connected with the adjusting nut of adjusting the pole looks spiro union, and the bottom surface of clamp plate and the top looks butt of pressurized elastic component.

Furthermore, a contact displacement sensor is vertically arranged beside the piezoelectric ceramic actuator, and the detection end of the contact displacement sensor is abutted against the top surface of the pressing plate.

Furthermore, the fine adjustment mechanism also comprises a mounting rack which is used for being fixed on a die head of the coating machine, the lower end of the mounting rack is fixedly connected with a horizontally arranged guide plate, and the piezoelectric ceramic actuator is connected with the contact type displacement sensor in a sliding manner along the vertical direction; the first fixing seat is fixed to the top of the mounting frame.

Furthermore, the horizontal section of the flow blocking block is in a non-rectangular shape, and the left side surface and the right side surface of the flow blocking block are inclined to the longitudinal axis of the flow blocking block.

Compared with the prior art, the utility model has the following effects: the utility model has reasonable design, realizes coarse adjustment by utilizing a differential thread structure and fine adjustment by utilizing a piezoelectric ceramic actuator, and combines the coarse adjustment and the fine adjustment, thereby not only effectively improving the flow regulation precision and the regulation efficiency, but also having stable coating quality and improving the coating uniformity.

Description of the drawings:

FIG. 1 is a schematic front sectional view of an embodiment of the present invention;

FIG. 2 is a schematic perspective view of an embodiment of the present invention;

FIG. 3 is a schematic front sectional view of the coarse adjustment mechanism according to the embodiment of the present invention;

FIG. 4 is a schematic front sectional view of a rebound mechanism in an embodiment of the present invention;

FIG. 5 is a schematic perspective view of a rebound mechanism in an embodiment of the present invention;

FIG. 6 is a schematic horizontal sectional view of a choke block according to an embodiment of the present invention;

FIG. 7 is a schematic perspective view of a choke block according to an embodiment of the present invention;

FIG. 8 is a schematic view of a plurality of blocks according to an embodiment of the present invention.

In the figure:

1-upper mould; 2-lower mould; 3-a gasket; 4-coarse adjustment mechanism; 5-fine adjustment mechanism; 6-a bluff block; 601-left side; 602-right side; 603-longitudinal axis; 604-a slit; 605-front side; 606-a bottom surface; 7-adjusting the rod; 8-a piezoceramic actuator; 9-an actuation end; 10-a first fixed seat; 11-a differential screw; 12-a moving axis; 13-a first thread segment; 14-a second thread segment; 15-a first vertical screw hole; 16-vertical slide holes; 17-a second vertical screw hole; 18-a limit step; 19-transverse screw holes; 20-a stop bolt; 21-a limiting block; 22-an operation hole; 23-a second fixed seat; 24-a vertical guide; 25-pressing plate; 26-a compression elastic member; 27-vertical through holes; 28-an adjusting nut; 29-an accommodation recess; 30-a contact displacement sensor; 31-a mounting frame; 32-guide plate.

The specific implementation mode is as follows:

the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In this embodiment, the flow rate adjusting mechanism is used for adjusting the output of coating liquid of a coating machine, the coating machine includes an upper die 1 and a lower die 2 which are matched with each other, a gasket 3 is clamped between the upper die and the lower die, the thickness of the gasket is the width of a coating slit, a coating opening for discharging is arranged at the front end of the gasket, and an adjusting elongated slot extending in the coating width direction is arranged above the coating opening.

As shown in fig. 1 to 8, the flow regulating mechanism for a die head of a coating machine of the present invention is arranged on an upper die of the coating machine, and comprises a coarse regulating mechanism 4, a fine regulating mechanism 5 and a flow blocking block 6 which are sequentially arranged from top to bottom, wherein the flow blocking block 6 is arranged above a coating slit and is arranged in an adjusting elongated slot of the upper die, and an adjusting rod 7 is arranged in the middle of the top surface of the flow blocking block 6; the fine adjustment mechanism 5 is connected between the coarse adjustment mechanism 4 and the adjusting rod 7. When the device is used, the coarse adjustment mechanism drives the fine adjustment mechanism, the adjusting rod and the flow blocking block to synchronously move along the vertical direction, so that coarse adjustment is realized; after the coarse adjustment mechanism finishes working, the fine adjustment mechanism drives the adjusting rod and the flow choking block to synchronously move along the vertical direction, so that fine adjustment is realized. The flow regulation precision is effectively improved by combining coarse regulation and fine regulation.

It should be noted that the flow rate adjusting mechanism of the die head of the coating machine can be installed on the upper die of the coating machine, or can be the lower die of the coating machine, and this embodiment adopts the upper die installed on the coating machine as an example, and if the whole adjusting mechanism is installed on the lower die, the flow blocking block is located in the lower die, and the specific structure is the same as that when installed on the upper die, and thus the description is not repeated here.

In this embodiment, the fine adjustment mechanism 5 includes a piezoelectric ceramic actuator 8 vertically disposed, and an actuation end 9 of the piezoelectric ceramic actuator 8 is hemispherical and abuts against the middle of the top surface of the adjustment lever 7 to form a point contact; the coarse adjustment mechanism 4 comprises a first fixed seat 10, a differential threaded component is vertically installed on the first fixed seat 10, and the moving end of the differential threaded component is connected with the upper end of the piezoelectric ceramic actuator 8. The coarse adjustment is realized by using a differential thread structure, and the fine adjustment is realized by using a piezoelectric ceramic actuator.

In this embodiment, as shown in fig. 3, the differential screw assembly includes a differential screw 11 and a moving shaft 12, which are both vertically disposed, the differential screw 11 is sequentially provided with a first thread section 13 and a second thread section 14, which have the same rotation direction, from top to bottom, a thread lead of the first thread section 13 is greater than a thread lead of the second thread section 14, and the first thread section 13 is in threaded connection with the first fixing seat 10; the second thread section 14 is in threaded connection with the upper end of the moving shaft 12, the moving shaft 12 is in sliding fit with the first fixed seat 10 along the vertical direction, and the lower end of the moving shaft 12 is in threaded connection with the upper end of the piezoelectric ceramic actuator 8. When the differential screw rod mechanism works, the differential screw rod 11 is rotated, the first thread section 13 of the differential screw rod 11 moves downwards relative to the first fixed seat 10, the moving shaft 12 moves upwards relative to the second thread section 14 of the differential screw rod 11, thread teeth with two different thread pitches are engaged, circular rotation is converted into linear motion by utilizing the thread pitch difference, the distance of downward movement of the differential screw rod 11 and the distance of upward movement of the moving shaft 12 are combined, movement with a small distance can be realized, the coarse adjustment resolution is improved, the adjustment is more accurate, and the sensitivity to the rotation angle of the differential screw rod can be reduced with high precision. The rotation of differential screw rod both can be the manual rotation of operator, also can be through the automation rotation of equipment, if the mode of operator manual rotation, reduces the requirement to the operator this moment, gives the operator a protection of preventing slow-witted.

It should be noted that, in the differential screw assembly, since the flow blocking block is slidably engaged with the upper die head of the coater only in the vertical direction (i.e. can only move in the vertical direction), and the moving shaft is connected with the flow blocking block through the piezoelectric ceramic actuator and the adjusting rod, the moving shaft also has only a freedom degree of movement in the vertical direction, and does not have a rotational freedom degree.

In this embodiment, for convenience in assembly, a first vertical screw hole 15 for matching with the first thread section 13 is formed in the top surface of the first fixing seat 10, and a vertical sliding hole 16 is communicated below the first vertical screw hole 15; the moving shaft 12 can only slide along the vertical sliding hole 16; the top surface of the moving shaft 12 is provided with a second vertical screw hole 17 for matching with the second thread section 14.

In this embodiment, in order to limit the upward vertical movement of the moving shaft, a limiting step 18 for limiting the moving shaft is disposed between the first vertical screw hole 15 and the vertical sliding hole 16.

In this embodiment, in order to facilitate the movable shaft to move vertically and then be fixed, the lower end of the first fixing seat 10 is provided with a horizontal screw hole 19 communicated with the vertical sliding hole 16, a stop bolt 20 is screwed in the horizontal screw hole 19, and the stop bolt abuts against the outer side wall of the movable shaft to lock the movable shaft, so that the movable shaft cannot move along the vertical sliding hole.

In this embodiment, in order to limit the upward movement of the differential screw, and avoid the choking block from excessively moving upward to cause damage, an inverted L-shaped limiting block 21 is fixed on the side surface of the first fixing seat 10, and a horizontal edge of the limiting block 21 is located on the upper side of the differential screw 11 and is used for abutting against the top surface of the differential screw 11, so as to limit the differential screw.

In this embodiment, when the differential screw is manually rotated by an operator, in order to rotate the differential screw conveniently, the top surface of the differential screw 11 is provided with a hexagonal operation hole 22 adapted to a hexagonal wrench.

In this embodiment, as shown in fig. 4 and 5, in order to facilitate the automatic upward springback of the adjusting rod, the upper end of the adjusting rod 7 is provided with a springback mechanism for driving the adjusting rod to move upward, the springback mechanism includes a second fixing seat 23, the adjusting rod 8 is in sliding fit with the second fixing seat 23 through a vertical guide 24, a pressing plate 25 connected with the adjusting rod 7 is arranged above the second fixing seat 23, and a pressure-bearing elastic member 26 vertically arranged is abutted between the pressing plate 25 and the second fixing seat 23. Utilize elasticity to block the flow of water piece to carry out the automatic resilience of mechanical type, and the vertical removal of block the flow of water piece realizes accurate direction through the guide, can realize the steady automatic resilience of block the flow of water piece, reduces transverse error, the difficult dead phenomenon of card that appears.

In this embodiment, be equipped with on the second fixing base 23 in order to do benefit to the vertical through-hole 27 that adjusts pole 7 and follow vertical through-hole, this vertical through-hole is the little stepped hole structure of both ends aperture, the big intermediate aperture, vertical installation of vertical guide 24 is in the middle hole portion of vertical through-hole.

In this embodiment, the vertical guide 24 can improve the vertical guiding precision and reduce the lateral movement, and the vertical guide 24 can be, for example, a steel ball bushing sleeved on the outer side of the adjusting rod 7. It should be noted that the steel ball bushing is an existing mature product, which is also called a steel ball linear bearing, and the detailed description of the specific structure is not repeated here. The high precision of the steel ball bush is utilized to form precise fit with the adjusting rod of the flow choking block, and the fit precision can reach the micron level. The steel ball bush limits the transverse freedom degree of the flow blocking block, and can ensure that the flow blocking block only moves along a preset direction (vertical direction).

In this embodiment, the upper end of the adjusting rod 7 has a threaded section, the press plate 25 is movably sleeved outside the threaded section of the adjusting rod 7, the top surface of the press plate 25 abuts against two adjusting nuts 28 screwed with the threaded section of the adjusting rod 7, and the bottom surface of the press plate 25 abuts against the top of the compressed elastic part 26. Utilize the pressurized elastic component to cooperate with adjusting nut and support the clamp plate, because the pressurized elastic component produces ascending power to the clamp plate all the time, the clamp plate passes through regulating spring and transmits this power for adjusting the pole, after adjusting the pole and remove downwards, this power can promote the automatic rebound that makes progress of adjusting the pole and reset. By rotating the adjusting nut, the adjusting nut drives the pressing plate to move up and down so as to adjust the compression degree of the compression elastic piece and further adjust the upward elasticity of the compression elastic piece.

In this embodiment, the top surface of the second fixing seat 23 is provided with an accommodating recess 29, and the bottom of the elastic compression element 26 abuts against the bottom surface of the accommodating recess.

In this embodiment, the compressed elastic member 26 may be, for example, a compression spring, and the compression spring is sleeved on the outer side of the adjusting rod.

In this embodiment, in order to detect the vertical displacement generated by the flow blocking block driven by the piezoelectric ceramic actuator 8, a contact displacement sensor 30 is vertically arranged beside the piezoelectric ceramic actuator 8, and a detection end of the contact displacement sensor 30 abuts against the top surface of the pressing plate 25. Because the pressure plate moves synchronously with the adjusting rod, the movement of the flow blocking block and the adjusting rod is detected by the contact type displacement sensor through the pressure plate. Because the contact type displacement sensor is adopted, micron-sized displacement can be detected.

In this embodiment, the fine adjustment mechanism further includes an installation frame 31 for fixing to the upper die 1 of the coating machine, the lower end of the installation frame 31 is fixedly connected with a horizontally arranged guide plate 32, and the piezoelectric ceramic actuator and the contact type displacement sensor are vertically and slidably connected with the guide plate 32; the first fixing seat 10 is fixed on the top of the mounting frame 31.

In this embodiment, the actuating end 9 of the piezoceramic actuator 8 forms a point contact with the middle of the top surface of the adjustment rod 7, i.e. the piezoceramic actuator and the adjustment rod are in a separate structure, and are not rigidly connected. The deformation generated after the piezoelectric ceramic actuator is electrified is utilized to drive the adjusting rod to move along the vertical direction, and then the adjusting effect on the flow choking block is achieved. The flow blocking block utilizes the elastic force of the compressed spring to perform mechanical automatic rebound, and the mechanical automatic rebound is matched with the piezoelectric ceramic actuator, so that the vertical movement of the flow blocking block has an automatic deviation rectifying effect, and high-frequency response can be realized by matching with an advanced algorithm.

In this embodiment, as shown in fig. 6 and 7, the horizontal section of the flow blocking block 6 is non-rectangular, the bottom 606 of the flow blocking block is a plane, and the left side 601 and the right side 602 of the flow blocking block 6 are inclined from the longitudinal axis 603 of the flow blocking block 6. Through the horizontal cross section design into non-rectangle form with the bluff piece, when two adjacent bluff pieces cooperate, the gap between two bluff pieces inclines with vertical looks, this moment the gap is not along vertical (the flow direction of scribbling liquid) direct through, scribble the liquid and can't directly pass the gap between two bluff pieces along vertical quick, this effectively reduces the velocity of flow of scribbling liquid, reduces fluidic direct distance, avoids the vertical rush, and then the risk that appears bulging muscle during greatly reduced coating.

In this embodiment, for convenience of processing, the left side 601 and the right side 602 of the choke block 6 are both planar. It should be noted that, the left and right side surfaces of the block are the slits 604 for matching with the adjacent block to form the coating liquid to pass through, the side surfaces can be inclined with the longitudinal axis of the block to avoid the direct and rapid flow of the coating liquid along the longitudinal direction, and besides being a plane, the side surfaces can also be other shapes, such as a wavy surface, or other opposite surfaces.

In this embodiment, for the convenience of processing, the front side 605 and the rear side of the choke block 6 are also planar, that is: the horizontal section of the flow blocking block is in a quadrilateral shape. Preferably, the horizontal section of the flow blocking block is in a parallelogram shape. According to the simulation analysis result, the influence of the slits between the flow blocking blocks with the horizontal sections in the parallelogram shape on the fluid is smaller than that of the slits between the rectangular flow blocking blocks, and the risk of rib bulging is effectively reduced.

In this embodiment, the choke block is manufactured by integrated processing.

In this embodiment, the entire flow blocking block is in a diamond shape.

In the embodiment, when the coating liquid applicator is used, the horizontal section of the flow blocking block is in a parallelogram shape, the left side surface and the right side surface of the flow blocking block are inclined surfaces (namely, the flow blocking blocks are inclined with the longitudinal axis of the flow blocking block), when a plurality of flow blocking blocks are transversely arranged side by side at intervals, as shown in fig. 8, the slit between the adjacent flow blocking blocks is inclined with the longitudinal axis of the flow blocking block, coating liquid cannot directly and quickly pass through the slit in an inclined state along the longitudinal direction, and the straight-through distance of the coating liquid is smaller than the width of the flow blocking blocks, so that the straight-through distance is reduced, the flowing speed of the coating liquid is reduced, straight-through flushing is avoided, and rib bulging risks are effectively reduced.

In this embodiment, the piezoelectric ceramic actuator is in the prior art, and has a cylindrical structure, and by increasing or decreasing the voltage output to the piezoelectric ceramic actuator, the length of the piezoelectric ceramic actuator changes, and the larger the voltage is, the largest the elongation is, and the specific structure and control principle of the piezoelectric ceramic actuator are not described here too much repeatedly. The piezoelectric ceramic actuator adopts direct drive, extends or shortens after increasing or decreasing the voltage output to the piezoelectric ceramic actuator, pushes the flow choking block to slightly move upwards or downwards by utilizing the expansion amount, realizes fine adjustment, has the adjustment precision reaching micron level, and responds to the speed block. The direct-drive piezoelectric ceramic actuator has high rigidity, stable output, good matching with other structures and high compatibility.

The specific implementation process comprises the following steps: when the differential screw rod mechanism works, the differential screw rod 11 is rotated, the first thread section 13 of the differential screw rod 11 moves downwards relative to the first fixed seat 10, the moving shaft 12 moves upwards relative to the second thread section 14 of the differential screw rod 11, thread teeth with two different thread pitches are used for meshing, the circumferential rotation is converted into linear motion by utilizing the thread pitch difference, and the distance of the downward movement of the differential screw rod 11 and the distance of the upward movement of the moving shaft 12 are combined, so that the movement with a smaller distance can be realized, the adjustment resolution is improved, and the adjustment is more accurate; at the moment, the differential screw 11 drives the piezoelectric ceramic actuator 8, the adjusting rod 7 and the flow choking block 6 to synchronously move downwards through the moving shaft 12, so that coarse adjustment is realized; then, the voltage output to the piezoelectric ceramic actuator 8 is increased, the piezoelectric ceramic actuator 8 extends and pushes the flow choking block 6 to move downwards continuously through the adjusting rod 7, and fine adjustment is achieved. When the flow choking block needs to move upwards, the differential screw 11 is rotated or the voltage output to the piezoelectric ceramic actuator 8 is reduced, and the compression spring pushes the adjusting rod 7 and the flow choking block 6 to move upwards by utilizing the elasticity of the compression spring, so that the upward movement is realized. Because the compression spring is always in a compressed state, even if the top surface middle part of the adjusting rod 7 is always abutted against the actuating end 9 of the piezoelectric ceramic actuator 8 under the action of elastic force when not in operation, point contact is formed. In the whole process, the differential screw thread structure drives the flow choking block 6 to move for a larger distance along the vertical direction, the coarse adjustment is carried out, then the voltage for the piezoelectric ceramic actuator 8 is added, the micron-sized elongation generated by the differential screw thread structure is utilized to push the flow choking block 6 to move, the fine adjustment is carried out, and the vertical adjustment of the flow choking block 6 reaches micron-sized precision. The combination of coarse adjustment and fine adjustment not only greatly improves the adjustment precision, but also utilizes the steel ball bushing to precisely guide the vertical movement of the adjusting rod, the error of the transverse offset of the adjusting rod during movement is small, the friction force is small, and the phenomenon of blocking due to large resistance is not easy to occur; the automatic stable rebound of the flow choking block is realized by utilizing the elastic force, and the high-frequency response can be realized by matching with a high-grade algorithm when the flow choking block is matched with the piezoelectric ceramic actuator. When the device is used, fine adjustment can be performed firstly to see whether the adjustment requirements are met, and coarse adjustment is not required if the adjustment requirements are met; if not, the coarse adjustment and the fine adjustment are combined.

It should be noted that, if the cost of the piezoelectric ceramic actuator is high and the flow rate is adjusted by only using the piezoelectric ceramic actuator, in order to achieve a wide adjustment range, the piezoelectric ceramic actuator with a large size needs to be used, and the whole production cost is high. According to the utility model, the differential thread structure is used as a coarse adjustment mechanism, so that adjustment in a larger range is realized, and high-precision fine adjustment of the piezoelectric ceramic actuator is combined, so that a large-size piezoelectric ceramic actuator is not required, and the production cost is greatly saved.

The utility model has the advantages that: the flow regulation precision is effectively improved, meanwhile, the response speed block of fine regulation has an automatic deviation rectification effect in the regulation process, and high-frequency response can be realized by matching with an advanced algorithm; the influence on the sudden change of the fluid flow speed during coating is small, the rib bulging risk is effectively reduced, the coating is more stable, and the uniformity is good. The adjusting mechanism does not need to adopt a motor, so that the size of the flow blocking block is smaller, the whole structure is compact, and the resolution ratio of slit adjustment is improved.

If the utility model discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.

Any part provided by the utility model can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the utility model or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the utility model as defined by the appended claims.

Claims

1. The utility model provides a coating machine die head flow control mechanism which characterized in that: the device comprises a coarse adjustment mechanism, a fine adjustment mechanism and a flow blocking block which are sequentially arranged from top to bottom, wherein the flow blocking block is arranged above a coating slit, and an adjusting rod is arranged in the middle of the top surface of the flow blocking block; the fine adjustment mechanism is connected between the coarse adjustment mechanism and the adjusting rod.

2. The flow regulating mechanism of the die head of the coating machine according to claim 1, characterized in that: the fine adjustment mechanism comprises a vertically arranged piezoelectric ceramic actuator, and the actuating end of the piezoelectric ceramic actuator is abutted against the middle part of the top surface of the adjusting rod; the coarse adjustment mechanism comprises a first fixed seat, a differential threaded component is vertically installed on the first fixed seat, and the moving end of the differential threaded component is connected with the upper end of the piezoelectric ceramic actuator.

3. The flow regulating mechanism of the die head of the coating machine according to claim 2, characterized in that: the differential screw assembly comprises a differential screw and a moving shaft which are vertically arranged, the differential screw is sequentially provided with a first screw section and a second screw section which have the same rotation direction from top to bottom, the screw lead of the first screw section is greater than that of the second screw section, and the first screw section is in threaded connection with the first fixed seat; the second thread section is in threaded connection with the upper end of the moving shaft, the moving shaft is in vertical sliding fit with the first fixing seat, and the lower end of the moving shaft is in threaded connection with the upper end of the piezoelectric ceramic actuator.

4. The flow regulating mechanism of the die head of the coating machine according to claim 3, characterized in that: the lower end of the first fixing seat is connected with a stop bolt which is transversely arranged and used for locking the movable shaft in a screwed mode, an inverted L-shaped limiting block is fixed to the side face of the first fixing seat, and the horizontal edge of the limiting block is located on the upper side of the differential screw rod to limit the differential screw rod.

5. The flow regulating mechanism of the die head of the coating machine according to claim 2, characterized in that: the upper end of adjusting the pole is equipped with and is used for the drive to adjust the resilience mechanism of pole rebound, resilience mechanism includes the second fixing base, adjust the pole through vertical guide and second fixing base sliding fit, the top of second fixing base is equipped with the clamp plate that is connected with the regulation pole, the butt has the pressure elastic component of vertical setting between clamp plate and the second fixing base.

6. The flow regulating mechanism of the die head of the coating machine according to claim 5, wherein: the clamp plate movable sleeve is established in the outside of adjusting the pole, and the top surface butt of clamp plate has adjusted the adjusting nut of pole looks spiro union, and the bottom surface of clamp plate and the top looks butt of pressurized elastic component.

7. The flow regulating mechanism of the die head of the coating machine according to claim 5, wherein: and a contact type displacement sensor is vertically arranged beside the piezoelectric ceramic actuator, and the detection end of the contact type displacement sensor is abutted with the top surface of the pressing plate.

8. The flow regulating mechanism of the die head of the coating machine according to claim 5, wherein: the precise adjustment mechanism also comprises a mounting rack which is used for fixing an upper die of the coating machine, the lower end of the mounting rack is fixedly connected with a horizontally arranged guide plate, and the piezoelectric ceramic actuator and the contact type displacement sensor are vertically and slidably connected with the guide plate; the first fixing seat is fixed to the top of the mounting frame.

9. The flow regulating mechanism of the die head of the coating machine according to claim 1, characterized in that: the horizontal section of the flow blocking block is in a non-rectangular shape, and the left side surface and the right side surface of the flow blocking block are inclined to the longitudinal axis of the flow blocking block.