A slot coating die head with a multi-layer coating head

Abstract

The present invention relates to the field of coating technology, and discloses a slit coating die head with a multi-layer coating head, comprising a plurality of coating heads, a plurality of shaping plates connected between the coating heads, a feed pipe connected to one side of the coating head, and a material mixing tank arranged on the surface of the coating head, each material mixing tank is fixedly connected with an air bag, the air bag is fixedly connected to the side of the bottom surface of the material mixing tank away from the feed pipe, one end of the air bag is fixedly connected with an air inlet pipe, one side of the coating head is provided with a connecting hole, one end of the air inlet pipe passes through the connecting hole and is fixedly connected with an air guide pipe, one side of the coating head is fixedly connected with a fixed block, a plurality of valves are connected through a connecting pipe, and one end of the connecting pipe is fixedly connected with a fan. By using the mutual cooperation of the air bag and the fan, the filling of the internal space of the material mixing tank is realized, thereby reducing the paint residue in the material mixing tank, avoiding the waste of paint, improving the utilization efficiency of the paint, and reducing the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of coating, in particular to a slit coating die head with a multi-layer coating head. Background Art

[0002] The slot coating die is the core component of the slot coating machine and plays a vital role in the coating process. The slot coating die is responsible for coating the coating material (such as ink, slurry, etc.) evenly and accurately on the substrate. Through a specific design, the coating material forms a stable pressure inside the die, and after precise control, it is evenly sprayed out from the die slit outlet. In this process, the precise design and manufacturing accuracy of the die play a decisive role in the uniformity and stability of the coating effect.

[0003] The multi-layer slit coating die head is a type of slit coating die head, which is composed of multiple coating heads. It can coat multiple colors on the product at the same time, realize the combination and mixing of colors, and improve the coating effect. The multi-layer slit coating die head generally includes multiple coating heads, a feed pipe and a shaping plate. When coating, the coating enters the coating head from the middle through the feed pipe into the material mixing tank opened in the coating head. The material mixing tank evenly distributes the coating. Then the coating is squeezed out from the slit between the two coating heads. Under the action of the shaping plate, it forms a fixed shape and is sprayed from the slit to the product to achieve coating.

[0004] As in the prior art, a utility model patent with authorization announcement number CN211838820U discloses a slit-type coating die for a coating machine, comprising a matching upper die and a lower die, the lower die is provided with a feed port and a cavity, the upper die and the lower die form a die lip gap, an adjustment block detachably connected to the lower die is provided in the cavity, a pre-pressing surface is provided on the adjustment block, the pre-pressing surface and the lower die form a pre-equalizing gap, and the feed port, the cavity, the pre-equalizing gap and the die lip gap are connected in sequence. The shape of the adjustment block is designed according to the actual rheological properties of the coating slurry. After the adjustment block is installed, the structure of the cavity can be changed to adapt the slit coating die to the characteristics of the slurry and ensure the uniformity of its lateral coating. When changing different slurries, only the adjustment block needs to be replaced, so that the slit coating die can be applied to a variety of slurries, which greatly reduces the cost of making the slit coating die. At the same time, the adjustment block and the cavity form a pre-equalizing gap, which increases the pre-uniform distribution link of the slurry and improves the accuracy of the lateral coating of the slit coating die.

[0005] Although the slit coating die head in the above-mentioned patent is suitable for a high-precision coating machine for a variety of coating slurries, the existing slit coating die head has certain defects when in use; in order to maintain the pressure on the sprayed paint and ensure stable coating, the existing slit coating die head will fill the sluice tank with paint. However, after completing a round of coating, when the feeding is finished, a large amount of paint will remain in the sluice tank. Since this part of the paint is exposed to the external environment, it will deteriorate and cannot be recycled and reused, resulting in waste of paint and increased production costs. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a slit coating die head with a multi-layer coating head to solve the problems raised by the background technology and reduce the waste of coating.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a slit-type coating die head with a multi-layer coating head, comprising multiple coating heads, multiple shaping plates connected between the coating heads, a feed pipe connected to one side of the coating head, and a material mixing groove arranged on the surface of the coating head, each material mixing groove is fixedly connected with an air bag, the air bag is fixedly connected to the side of the bottom surface of the material mixing groove away from the feed pipe, one end of the air bag is fixedly connected with an air inlet pipe, a connecting hole is provided on one side of the coating head, one end of the air inlet pipe passes through the connecting hole and is fixedly connected with an air guide pipe, one side of the coating head is fixedly connected with a fixed block, a plurality of mounting grooves are provided on the surface of the fixed block, a valve is fixedly connected in each mounting groove, each air guide pipe is respectively connected to a valve, and the multiple valves are connected through a connecting pipe, one end of the connecting pipe is fixedly connected with a fan, and an air cavity is provided in the air bag.

[0008] Furthermore, an isolation belt is fixedly connected to the top of the inner wall of the material mixing trough away from the feed pipe, and the other side of the isolation belt is fixedly connected to the bottom of the inner wall of the material mixing trough close to the feed pipe, and is located below the feed pipe. The bottom surface of the isolation belt fits the surface of the airbag, and the other two sides of the isolation belt are fixedly connected to connecting belts, and one side of the connecting belt is fixedly connected to the inner wall of the material mixing trough.

[0009] Furthermore, a support belt is connected between the isolation belt and the airbag, a winding groove is provided at the bottom of the material mixing trough close to the feed pipe, a rotating shaft is rotatably connected in the winding groove, one side of the support belt is fixedly connected to the outer wall of the rotating shaft, and the other side of the support belt is fixedly connected to the top of the inner wall of the material mixing trough away from the feed pipe, rotating grooves corresponding to the position of the rotating shaft are provided on both sides of the inner wall of the winding groove, both ends of the rotating shaft pass through the rotating groove and are fixedly connected with connecting blocks, a connecting groove corresponding to the position of the connecting block is provided in the coating head, a coil spring is fixedly connected to the inner wall of the connecting groove, and the middle part of the coil spring is fixedly connected to the outer wall of the connecting block.

[0010] Furthermore, the upper and lower surfaces of the support belt are fixedly connected with anti-stick coatings.

[0011] Furthermore, a support plate is fixedly connected to a side of the inner wall of the air cavity away from the feed pipe, the cross section of the support plate is triangular, and the inclined surface of the support plate close to the feed pipe is an arc surface.

[0012] Furthermore, an air guide groove is provided in the support plate, one end of the air inlet pipe is connected to the air guide groove, and a plurality of air vents connected to the air guide groove are provided on the surface of the support plate.

[0013] Furthermore, the upper and lower surfaces of the inner wall of the air cavity are fixedly connected with fixing belts, and a plurality of fixing ropes are fixedly connected between the two fixing belts. The length of the fixing rope is smaller than the distance between the bottom surface of the material mixing trough and the bottom surface of the shaping plate.

[0014] Furthermore, a reinforcement sleeve is fixedly connected to the middle portion of the connecting pipe.

[0015] Furthermore, the valve is a solenoid valve or a ball valve.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The slot-type coating die head with a multi-layer coating head utilizes the cooperation between the airbag and the fan to control the inflation and deflation of the airbag to achieve filling of the internal space of the sparging tank, thereby reducing the paint residue in the sparging tank, avoiding the waste of paint, improving the utilization efficiency of the paint, and reducing the production cost;

[0018] (2) The isolation belt and the connecting belt can isolate the paint in the mixing tank from the airbag, thereby preventing the paint from contacting the outer wall of the airbag, making it easier for workers to clean the entire device. At the same time, it also prevents the outer wall of the airbag from being contaminated by paint and causing adhesion, which affects the contraction and expansion of the airbag;

[0019] (3) The support belt can drive the isolation belt to rise synchronously, thereby maintaining the stability and uniformity of the coating flow, preventing the situation where part of the coating is squeezed more and causes coating defects, which helps to improve the coating quality;

[0020] (4) The anti-stick coating can prevent the support belt from being squeezed by high-pressure paint for a long time and from sticking to the isolation belt and the airbag, preventing the support belt from being unable to be properly rolled up by the shaft, ensuring that the support belt can always maintain a smooth running state, and improving the running stability of the support belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional split structure of the present invention as a whole;

[0023] Figure 3It is a schematic diagram of the three-dimensional structure of the fan, connecting pipe, fixing block and air guide pipe of the present invention;

[0024] Figure 4 It is a schematic diagram of the three-dimensional disassembled structure of the valve, connecting pipe, fixing block and air guide pipe of the present invention;

[0025] Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the coating head and the isolation belt of the present invention;

[0026] Figure 6 for Figure 5 An enlarged three-dimensional cross-sectional structural diagram at A above;

[0027] Figure 7 It is a schematic diagram of the three-dimensional cross-sectional structure of the coating head of the present invention;

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the coil spring, isolation belt, connecting belt and airbag of the present invention;

[0029] Fig. 9 It is a three-dimensional structural schematic diagram of another form of the present invention;

[0030] Fig.10 It is a schematic diagram of the three-dimensional disassembled structure of the coil spring, isolation belt, support belt and airbag of the present invention;

[0031] Fig.11 It is a schematic diagram of the three-dimensional cross-sectional structure of the airbag, the support plate, the fixing belt and the fixing rope of the present invention;

[0032] Fig.12 It is a schematic diagram of a three-dimensional cross-sectional structure of a support plate of the present invention;

[0033] Fig.13 It is a schematic diagram of the three-dimensional structure of the fixing belt and the fixing rope of the present invention.

[0034] In the figure: 1. coating head; 2. material mixing trough; 3. air bag; 4. air inlet pipe; 5. air guide pipe; 6. fixing block; 7. mounting groove; 8. valve; 9. connecting pipe; 10. fan; 11. isolation belt; 12. winding groove; 13. rotating shaft; 14. supporting belt; 15. connecting block; 16. connecting groove; 17. coil spring; 18. supporting plate; 19. air guide groove; 20. vent hole; 21. fixing belt; 22. fixing rope; 23. feeding pipe; 24. connecting belt; 25. reinforcing sleeve; 26. rotating groove; 27. shaping plate; 28. air cavity; 29. ​​anti-stick coating; 30. connecting hole. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] See also Figures 1 to 13 A slit coating die head with a multi-layer coating head comprises a plurality of coating heads 1, a plurality of shaping plates 27 connected between the coating heads 1, a feed pipe 23 connected to one side of the coating head 1 and a material mixing tank 2 arranged on the surface of the coating head 1, each material mixing tank 2 is fixedly connected with an air bag 3, the air bag 3 is fixedly connected to the side of the bottom surface of the material mixing tank 2 away from the feed pipe 23, one end of the air bag 3 is fixedly connected with an air inlet pipe 4, a connecting hole 30 is provided on one side of the coating head 1, one end of the air inlet pipe 4 passes through the connecting hole 30 and is fixedly connected with an air guide pipe 5, a fixing block 6 is fixedly connected to one side of the coating head 1, a plurality of mounting grooves 7 are provided on the surface of the fixing block 6, a valve 8 is fixedly connected in each mounting groove 7, each air guide pipe 5 is respectively connected with a valve 8, and the plurality of valves 8 are connected through a connecting pipe 9, one end of the connecting pipe 9 is fixedly connected with a fan 10, and an air cavity 28 is arranged in the air bag 3.

[0037] In the slit-type coating die head with a multi-layer coating head of the present invention, when the coating operation is normally carried out, the gas in the airbag 3 will be extracted by the fan 10, so that the airbag 3 will shrink, thereby preventing the airbag 3 from occupying the internal space of the mixing tank 2; when the coating work is about to be completed, the fan 10 will gradually fill the air into the airbag 3 through the connecting pipe 9 and the air guide pipe 5, so that the airbag 3 will expand and occupy the internal space of the mixing tank 2, so that the paint that can enter the mixing tank 2 will gradually decrease, reducing the maximum paint capacity in the mixing tank 2, thereby gradually reducing the paint residue in the mixing tank 2, so as to ensure that no excess paint will remain in the mixing tank 2 at the end of coating. When the coating work is completed, the feed pipe 23 stops supplying paint. At this time, the airbag 3 expands to its maximum, and the maximum paint capacity in the sparging tank 2 is reduced to the minimum, so that only a small amount of paint remains in the sparging tank 2; by utilizing the mutual cooperation of the airbag 3 and the fan 10, by controlling the inflation and deflation of the airbag 3, the filling of the internal space of the sparging tank 2 is achieved, thereby reducing the paint residue in the sparging tank 2, avoiding the waste of paint, improving the utilization efficiency of the paint, and reducing the production cost; the valve 8 can be used to control the opening and closing of the air guide tube 5, so as to realize the adjustment of the airbag 3 in different coating heads 1 and achieve more precise control.

[0038] It is worth noting that the fan 10 is a mature product in the prior art, and can inflate and deflate the airbag 3 through the connecting pipe 9 and other pipelines, so it will not be described in detail here.

[0039] As a preferred technical solution of the present invention, an isolation belt 11 is fixedly connected to the top of the inner wall of the material trough 2 away from the feeding pipe 23, and the other side of the isolation belt 11 is fixedly connected to the bottom of the inner wall of the material trough 2 close to the feeding pipe 23, and is located below the feeding pipe 23. The bottom surface of the isolation belt 11 is in contact with the surface of the airbag 3, and the other two sides of the isolation belt 11 are fixedly connected to connecting belts 24, and one side of the connecting belt 24 is fixedly connected to the inner wall of the material trough 2.

[0040] Specifically, the isolation belt 11 and the connecting belt 24 can isolate the paint in the material mixing tank 2 from the airbag 3, thereby preventing the paint from contacting the outer wall of the airbag 3, making it easier for staff to clean the entire device, while also preventing the outer wall of the airbag 3 from being contaminated by paint and causing adhesion, which would affect the contraction and expansion of the airbag 3.

[0041] As a preferred technical solution of the present invention, a support belt 14 is connected between the isolation belt 11 and the airbag 3, a winding groove 12 is opened at the bottom of the material sparging trough 2 close to the feeding pipe 23, and a rotating shaft 13 is rotatably connected in the winding groove 12. One side of the support belt 14 is fixedly connected to the outer wall of the rotating shaft 13, and the other side of the support belt 14 is fixedly connected to the top of the inner wall of the material sparging trough 2 away from the feeding pipe 23. Rotating grooves 26 corresponding to the position of the rotating shaft 13 are opened on both sides of the inner wall of the winding groove 12, and both ends of the rotating shaft 13 pass through the rotating groove 26 and are fixedly connected to a connecting block 15. A connecting groove 16 corresponding to the position of the connecting block 15 is opened in the coating head 1, and a coil spring 17 is fixedly connected to the inner wall of the connecting groove 16, and the middle part of the coil spring 17 is fixedly connected to the outer wall of the connecting block 15.

[0042] Specifically, during coating, the airbag 3 contracts, and under the pressure of the coating, the isolation belt 11 and the support belt 14 are squeezed into a shape similar to the attached Fig. 9 As shown in the shape, the isolation belt 11 will form an arc structure, thereby reducing the turbulence that occurs after the paint enters the sizing tank 2. Compared with the design of sharp angles or right angles, the semicircular inner wall can reduce the turbulence generated when the fluid flows, thereby helping to maintain the uniformity of the paint and improve the flow distribution of the paint; when the airbag 3 is slowly inflated, the support belt 14 and the isolation belt 11 will be propped up by the airbag 3. At this time, under the action of the coil spring 17, the support belt 14 will always remain taut. Since the winding of the rotating shaft 13 will restrict the support belt 14, the various parts of the support belt 14 along the direction of the coating head 1 will keep rising synchronously, thereby driving the isolation belt 11 to rise synchronously, thereby maintaining the stability and uniformity of the paint flow, preventing the situation where part of the paint is subjected to greater extrusion and causing coating defects, and helping to improve the coating quality.

[0043] As a preferred technical solution of the present invention, the upper and lower surfaces of the support belt 14 are fixedly connected with an anti-stick coating 29 .

[0044] Specifically, the anti-stick coating 29 can prevent the support belt 14 from being squeezed by high-pressure paint for a long time and causing adhesion between the isolation belt 11 and the airbag 3, thereby preventing the support belt 14 from being unable to be correctly wound up by the rotating shaft 13, ensuring that the support belt 14 can always maintain a smooth running state, thereby improving the running stability of the support belt 14.

[0045] As a preferred technical solution of the present invention, a support plate 18 is fixedly connected to the side of the inner wall of the air cavity 28 away from the feed pipe 23. The cross-section of the support plate 18 is triangular, and the inclined surface of the support plate 18 close to the feed pipe 23 is an arc surface.

[0046] Specifically, after the airbag 3 shrinks, the support plate 18 will support the upper layer of the airbag 3, ensuring that the upper layer of the airbag 3, the isolation belt 11 and the support belt 14 can jointly maintain an optimized arc shape, further reducing the turbulence phenomenon during the flow of the paint, optimizing the flow of the paint, and helping to improve the consistency and quality of the coating. The supporting effect of the support plate 18 enhances the stability of the airbag 3 in the contracted state and prevents the unstable flow of the paint caused by the deformation of the airbag 3.

[0047] As a preferred technical solution of the present invention, an air guide groove 19 is opened in the support plate 18, one end of the air inlet pipe 4 is connected to the air guide groove 19, and a plurality of air vents 20 connected to the air guide groove 19 are opened on the surface of the support plate 18.

[0048] Specifically, through the air guide groove 19 and the vent hole 20, when the fan 10 evacuates the airbag 3, the airflow will flow into the air guide groove 19 through the vent hole 20, forming an adsorption force on the airbag 3. This adsorption force will tightly adsorb the upper layer of the airbag 3 on the support plate 18, and the support plate 18 not only provides support for the airbag 3, but also enhances the stability of the airbag 3 in the contracted state, thereby achieving a shaping effect on the support plate 18.

[0049] As a preferred technical solution of the present invention, the upper and lower surfaces of the inner wall of the air cavity 28 are fixedly connected with fixing belts 21, and multiple fixing ropes 22 are fixedly connected between the two fixing belts 21. The length of the fixing rope 22 is less than the distance between the bottom surface of the material mixing trough 2 and the bottom surface of the shaping plate 27.

[0050] Specifically, the fixing rope 22 and the fixing belt 21 can be used to limit the maximum height of the airbag 3 expansion, preventing the airbag 3 from over-expanding and blocking the slit between the coating heads 1, thereby ensuring the stability of the overall operation of the device.

[0051] As a preferred technical solution of the present invention, a reinforcing sleeve 25 is fixedly connected to the middle of the connecting pipe 9 .

[0052] Specifically, the reinforcing sleeve 25 can strengthen the strength of the connection parts of each branch pipe on the connecting pipe 9, thereby preventing the connection parts of each branch pipe on the connecting pipe 9 from being frequently subjected to air pressure shocks and cracking or damage, thereby increasing the service life of the connecting pipe 9.

[0053] As a preferred technical solution of the present invention, the valve 8 is a solenoid valve or a ball valve.

[0054] Specifically, the valve 8 set by the solenoid valve can be opened and closed fully automatically, which is more efficient; the valve 8 set by the spherical valve needs to be opened and closed manually, which is lower in cost, and the manufacturer can choose to manufacture it according to actual needs.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slot-type coating die head with a multi-layer coating head, comprising a plurality of coating heads (1), a plurality of shaping plates (27) connected between the coating heads (1), a feed pipe (23) connected to one side of the coating head (1), and a material mixing tank (2) arranged on the surface of the coating head (1), characterized in that: Each of the material mixing troughs (2) is fixedly connected to an air bag (3), the air bag (3) being fixedly connected to a side of the bottom surface of the material mixing trough (2) away from the feed pipe (23), one end of the air bag (3) being fixedly connected to an air intake pipe (4), one side of the coating head (1) being provided with a connection hole (30), one end of the air intake pipe (4) passing through the connection hole (30) and being fixedly connected to an air guide pipe (5), one side of the coating head (1) being fixedly connected to a fixing block (6), a surface of the fixing block (6) being provided with a plurality of mounting grooves (7), each mounting groove (7) being fixedly connected to a A valve (8) is connected, each air guide pipe (5) is respectively connected to a valve (8), and the plurality of valves (8) are connected via a connecting pipe (9), one end of the connecting pipe (9) is fixedly connected to a fan (10), and an air cavity (28) is provided in the air bag (3); the top of the inner wall of the material mixing trough (2) away from the feeding pipe (23) is fixedly connected to an isolation belt (11), and the other side of the isolation belt (11) is fixedly connected to the bottom of the inner wall of the material mixing trough (2) close to the feeding pipe (23), and is located below the feeding pipe (23). The bottom surface of the isolation belt (11) is in contact with the surface of the airbag (3), and the other two sides of the isolation belt (11) are fixedly connected to connecting belts (24), and one side of the connecting belt (24) is fixedly connected to the inner wall of the material mixing groove (2); a support belt (14) is connected between the isolation belt (11) and the airbag (3), and a winding groove (12) is provided at the bottom of the material mixing groove (2) near the feeding pipe (23), and a rotating shaft (13) is rotatably connected in the winding groove (12), and one side of the support belt (14) is fixedly connected to the outer wall of the rotating shaft (13), and the support belt The other side of the coating head (1) is fixedly connected to the top of the inner wall of the material mixing groove (2) away from the feeding pipe (23), and the inner wall of the winding groove (12) is provided with rotating grooves (26) corresponding to the position of the rotating shaft (13), and both ends of the rotating shaft (13) pass through the rotating grooves (26) and are fixedly connected to the connecting block (15). The coating head (1) is provided with a connecting groove (16) corresponding to the position of the connecting block (15), and the inner wall of the connecting groove (16) is fixedly connected to a coil spring (17), and the middle part of the coil spring (17) is fixedly connected to the outer wall of the connecting block (15).

2. A slot coating die head with a multi-layer coating head according to claim 1, characterized in that: The upper and lower surfaces of the support belt (14) are both fixedly connected with an anti-stick coating (29).

3. A slot coating die head with a multi-layer coating head according to claim 1, characterized in that: A support plate (18) is fixedly connected to a side of the inner wall of the air cavity (28) away from the feed pipe (23); the cross section of the support plate (18) is quasi-triangular, and the inclined surface of the support plate (18) on the side close to the feed pipe (23) is an arc surface.

4. A slot coating die head with a multi-layer coating head according to claim 3, characterized in that: An air guide groove (19) is provided in the support plate (18), one end of the air inlet pipe (4) is connected to the air guide groove (19), and a plurality of air vents (20) connected to the air guide groove (19) are provided on the surface of the support plate (18).

5. The slot coating die head with a multi-layer coating head according to claim 1, characterized in that: The upper and lower surfaces of the inner wall of the air cavity (28) are fixedly connected with fixing belts (21), a plurality of fixing ropes (22) are fixedly connected between the two fixing belts (21), and the length of the fixing ropes (22) is less than the distance between the bottom surface of the material mixing trough (2) and the bottom surface of the shaping plate (27).

6. A slot coating die head with a multi-layer coating head according to claim 1, characterized in that: A reinforcement sleeve (25) is fixedly connected to the middle portion of the connecting pipe (9).

7. A slot coating die head with a multi-layer coating head according to claim 1, characterized in that: The valve (8) is a solenoid valve or a spherical valve.

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