Slurry point coating unit components

Abstract

The present invention discloses a slurry point coating unit assembly, which comprises a pressure-bearing transmission roller and a driving motor thereof, a slurry point mesh cylinder and a driving motor thereof, and an expansion roller. The pressure-bearing transmission roller and the slurry point mesh cylinder form an upper and lower fit; the two ends of the mesh cylinder are respectively provided with fixedly connected transmission shaft heads, and the two transmission shaft heads are respectively connected with synchronously driven servo motors. A slurry tube and an inner scraper are provided inside the mesh cylinder, and the slurry flows out from the slurry tube, the inner scraper, and the numerous slurry point holes on the surface of the mesh cylinder in sequence, and is coated on the cloth surface to form a regularly arranged slurry point cloth. The mesh cylinder slurry point holes are preferably in a shape in which the inner wall elliptical inlet gradually changes to the outer wall circular outlet, and the area of ​​the ellipse is the same as that of the circle. The mesh cylinder of the present invention is not easy to twist and deform, the slurry can be scraped in as quickly as possible, and the slurry at the outlet of the slurry point hole is not easy to be short of material.

Description

Technical Field

[0001] The invention relates to a component technology of printing and dyeing equipment. Background Art

[0002] The traditional paste dot coating unit is composed of parts such as the cloth inlet expansion roller, pressure transmission roller, paste dot mesh roller and cloth outlet drag roller (or expansion roller). It can realize the paste dot coating on the filament finishing cloth surface. The common paste dot size of the cloth surface is about 0.20mm~0.40mm, and the coating density is 50~200 / inch². In order to evenly and stably coat such tiny paste dots on the cloth surface, precise and stable paste dot equipment is required. Among them, the cloth inlet expansion roller is mainly to ensure that the 1.5-meter-wide finishing cloth can be fully flattened before entering the paste dot unit, and there is no wrinkle on the cloth surface, which will ensure the success and uniformity of the dot coating.

[0003] The pressure transmission roller and the pulp point mesh cylinder form a top-to-bottom match. The pressure roller is a metal mirror roller at the bottom, and the pulp point mesh cylinder is located above the cross-section of the pressure roller. The two rollers maintain precise and consistent vertical levels. The pulp point mesh cylinder is also made of metal material with a diameter of about 220mm.

[0004] The slurry of a certain concentration is accumulated inside the mesh cylinder by the external slurry pump and first enters the inner scraper of the mesh cylinder. The inner scraper is a specially customized transverse metal cutter. During the production process, the inner scraper is pressed down to the inner line of the mesh cylinder by a stepper motor. When the slurry is evenly extruded from the inside of the inner scraper, a uniform linear slurry groove dynamic area will be formed in the transverse direction of the entire mesh cylinder. Through the rotation of the mesh cylinder, the slurry and the inner scraper form a reverse internal vortex pressure, thereby evenly squeezing the slurry from the micropores of the mesh cylinder.

[0005] When the slurry is squeezed out of the mesh cylinder, it can contact the cloth surface, and the cloth surface is flatly sandwiched between the mesh cylinder and the pressure roller. Then the slurry dots are smoothly transferred on the cloth surface, and the dot pattern is basically uniform, forming a cloth with regularly arranged slurry dots.

[0006] The invention of application number: 2014108175983 discloses a metal scraper printing device for a printing machine, including a knife bar, a pulp pipe, an air pipe, a pulp blade, a fabric, a printing guide, a drag roller and a round screen, the knife bar is connected with a pulp pipe, the pulp pipe is arranged at one side of the knife bar, the air pipe is arranged below the pulp pipe, the pulp blade is fixedly connected to the bottom end of the knife bar, the fabric is arranged below the round screen, the round screen is arranged between the pulp blade and the fabric, the fabric is arranged on the printing guide, and a drag roller is arranged below the printing guide. The mesh cylinder of the device has many parts inside, which are easy to fail; and there is a lack of special design between the pulp point holes on the mesh cylinder and the scraper, which may not be fully coated. Summary of the invention

[0007] The technical problem solved by the invention is to overcome the shortcomings of the traditional slurry point coating unit, which has many slurry tubes and scraper parts and the slurry points are easily missing locally, and to provide a slurry point coating unit component with uniform and stable slurry point shape, not easy to be damaged, few parts and low failure rate.

[0008] Technical solution:

[0009] The paste point coating unit assembly of the present invention comprises a pressure-bearing transmission roller and a driving rotating device (motor) thereof, a paste point mesh cylinder and a driving rotating device (motor) thereof, and an expanding roller.

[0010] The pressure transmission roller and the pulp point mesh cylinder form an upper and lower cooperation, the pressure roller is at the lower part, and the pulp point mesh cylinder is above the pressure roller. The gap between the two is basically the thickness of one layer of cloth, and they are basically tangent (leaving a gap for cloth to travel), and the two rollers maintain precise and consistent upper and lower levels.

[0011] In the front and subsequent conveying of the cloth, there are one or more guide rollers, or an expansion roller, to make the cloth surface unfold smoothly.

[0012] The mirror surface of the pressure roller is wear-resistant and its diameter is larger than that of the mesh cylinder, so that the cloth surface is evenly stressed and the pulp points are evenly transferred.

[0013] There is a fixed, non-rotating slurry pipe inside the mesh cylinder, one end of which is connected to the slurry source (connected to the slurry source by an external slurry pump to drive the slurry, and the slurry can be equipped with a heating device to make the thermoplastic slurry melt and flow). There are many evenly distributed slurry outlet holes at the bottom or side of the slurry pipe, which can drip the slurry onto the inner wall of the slurry point mesh cylinder; the wall of the slurry point mesh cylinder has many regularly arranged slurry point holes.

[0014] Preferably, a hollow scraper is welded on the outer wall of one side of the slurry outlet hole of the slurry tube inside the mesh cylinder. The numerous evenly distributed slurry outlet holes of the slurry tube first drip the slurry into the internal space of the inner scraper, and then discharge or flow out through the scraping holes (which can be multiple evenly distributed circular holes or narrow slits) at the lower end of the inner scraper, and drip onto the inner wall of the mesh cylinder (that is, the radial length of the inner scraper of the mesh cylinder is close to the inner diameter of the mesh cylinder, which can not only flow out the slurry, but also scrape the inner wall of the mesh cylinder to squeeze out the slurry, thereby transferring it to the cloth surface).

[0015] As the mesh cylinder rotates, the inner scraper does not rotate. When the slurry is evenly discharged from the inner scraper, a scraping action is formed between the inner scraper and the inner wall of the mesh cylinder, and the slurry is evenly squeezed out of the micropores of the mesh cylinder. The slurry is squeezed from the inner wall of the mesh cylinder to the outer wall, forming a uniform linear slurry state area in the lateral direction of the entire mesh cylinder. Then, through the rotation of the mesh cylinder, it contacts the cloth surface of the cloth (at this time, the cloth surface is flatly sandwiched between the mesh cylinder and the pressure roller, and the cloth surface comes out from between the "mesh cylinder" and the "pressure roller"), and then the slurry on the outer wall of the mesh cylinder is transferred to the cloth surface, and the slurry is sequentially coated or dotted on the moving cloth surface. The cloth surface that has completed dot printing is subsequently transferred to the drying channel or cooling channel, so that the slurry points solidify or condense on the cloth surface, forming a cloth with regularly arranged slurry points.

[0016] The pressure-bearing transmission roller is a solid roller, one end of which is connected with a driving device for driving the roller to rotate.

[0017] The two ends of the net cylinder are respectively provided with fixedly connected transmission shaft heads. The two transmission shaft heads are respectively provided with synchronously driven servo motors (controlled by a controller to rotate synchronously), so that there is no torque formed asynchronously between the two ends, so that the wall surface of the net cylinder will not be distorted or damaged.

[0018] Compared with the form of driving motor at only one end, the net cylinder of the present invention does not deform and has a longer service life; compared with the traditional drive with an ordinary motor at each end (connected by gear kneading and transmission shaft), it avoids the undesirable phenomenon that the two ends cannot be strictly synchronized due to the gap between the gears, resulting in the distortion and deformation of the net cylinder.

[0019] In the present invention, the slurry point hole is preferably a gradual shape from an elliptical inlet on the inner wall to a circular outlet on the outer wall, the ellipse (the major axis is parallel to the central axis of the mesh cylinder, so that the circumferential distance is shorter, because the blade of the scraper is also parallel to the central axis of the mesh cylinder, which is convenient for the inner scraper to quickly scrape the slurry to fill the slurry point hole, and the slurry is not easily lacking) has the same area as the circle (so that the amount of slurry entering and exiting is basically maintained consistent, and the slurry point is uniform and stable), and the middle of the mesh hole is bulging (to facilitate the storage of some slurry in it, so that the slurry at the circular outlet on the outer wall can occupy the entire coating surface of the outlet, and apply standard dots, further ensuring that the slurry points on the cloth surface will not be locally lacking).

[0020] Alternatively, the pulp point holes are a gradient shape from a rectangular entrance (to facilitate the inner scraper to quickly scrape the pulp to fill the pulp point holes) to a square exit. The rectangle and the square have the same area, and the middle of the mesh is bulging so that standard square pulp points can be coated on the cloth surface, which is not prone to local material shortages.

[0021] The expanding roller makes the cloth surface unfold smoothly, which is beneficial to unwinding or rewinding the cloth.

[0022] Beneficial effects:

[0023] 1. The contact surface between the traditional screen cylinder and the pressure roller is very small, and the stepper motor is used to control the pressing depth of the inner scraper, which is easy to damage the screen cylinder. Compared with the traditional pressure roller, the pressure roller of the present invention has a larger roller surface radius, which increases the contact surface between the screen cylinder and the pressure roller, can maintain the flatness of the instantaneous cloth surface dot printing area during the production process, is beneficial to protect the screen cylinder, and form a good pulp dot pattern.

[0024] 2. The length of the traditional net cylinder is 1.8m~2.0m, and the two ends of the net cylinder are synchronously driven and rotated through gears and transmission shafts. The result of this design is that too many connections are used, the gap between the gears and the vibration of the transmission rod ultimately affect the synchronization and stability of the drive at both ends of the net cylinder. Gear transmission is prone to asynchronous beating, which in turn causes the rotation of the two ends of the net cylinder to be unable to be strictly synchronized. The net cylinder may be twisted and deformed during rotation, which directly leads to uneven and inconsistent pulp points on the cloth surface.

[0025] The net cylinder of the present invention is driven by two separate servo motors at both ends, and the same drive controller uses dual feedback to control the synchronous transmission of the servo motors at both ends of the net cylinder, so that the transmission at both ends of the net cylinder is strictly synchronized. This solves the problem of the torque deformation of the net cylinder caused by the single-side drive of the traditional net cylinder (or the gear and transmission shaft driving the other side after the single-side drive).

[0026] 3. The present invention can control the rotation speed more stably. The speed command of the driver comes from the speed pulse command output by the pressure roller servo motor. In this way, the accuracy can be controlled within one rotation and the error can be reduced to about one ten-thousandth. It replaces the gear transmission motor structure with integrated inverter drive in the past. The present invention does not have multi-stage drive of gears and transmission shafts, especially metal transmission parts with wear gaps. The net cylinder no longer generates vibration and abnormal noise, which optimizes the workshop environment and reduces the frequency of equipment maintenance.

[0027] 4. The inner wall of the slurry point hole is elliptical or rectangular, so that the slurry can be scraped in as quickly as possible. The speed of the slurry point hole in and out is basically the same. The slurry point hole can store the slurry for a short time, so that the slurry at the outlet is not easy to be short of material. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a cross-sectional structure along the axial direction of the net cylinder of the present invention;

[0029] Figure 2 yes Figure 1 Left view of

[0030] Figure 3 It is a pulp point net cylinder and a driving rotation device at one end thereof of the present invention;

[0031] Figure 4 yes Figure 3 A cross-sectional view of the middle screen tube;

[0032] Figure 5 It is a three-dimensional structural schematic diagram of a part of a pulp point net cylinder and a pulp point hole of the present invention;

[0033] Figure 6 It is a three-dimensional structural schematic diagram of a part of the pulp point net cylinder of the present invention and another pulp point hole.

[0034] In the figure, 1-pressure (transmission) roller; 2-net cylinder; 3-net cylinder sleeve; 4-expanding roller; 5-guide roller; 17-net cylinder outer wall; 18-net cylinder inner wall; 19-slurry point hole; 20-transmission shaft head; 21-synchronous belt; 22-servo motor; 23-bearing; 24-slurry pipe; 25-inner scraper; 26-slurry outlet hole; 29-inner wall elliptical inlet; 30-outer wall circular outlet; 31-rectangular inlet; 32-square outlet; 33-side wall of bulging hole. DETAILED DESCRIPTION

[0035] Embodiment 1:

[0036] like Figure 1 , 2 The slurry point coating unit assembly shown has a pressure-bearing transmission roller 1 and its driving rotating device, a slurry point mesh cylinder 2 and its driving rotating device, and an expanding roller 4; the pressure-bearing transmission roller 1 and the slurry point mesh cylinder 2 form a basically tangential upper and lower fit, and the slurry point mesh cylinder 2 is above the pressure-bearing roller 1; a fixed and non-rotating slurry tube 24 is provided inside the mesh cylinder 2, one end of the slurry tube 24 is connected to a liquid slurry source, and the bottom or side of the slurry tube 24 has a plurality of evenly distributed slurry outlet holes 26, which can drip the slurry onto the inner wall 18 of the slurry point mesh cylinder.

[0037] like Figure 3 As shown, the wall surface of the pulp point mesh cylinder 2 has numerous regularly arranged pulp point holes 19; in the front or subsequent conveying of the cloth, there is an expansion roller 4 to make the cloth surface flat and spread out.

[0038] The two ends of the net cylinder 2 are respectively connected with fixed Figure 1 The net tube sleeve 3 shown in the figure, the two net tube sleeves 3 are driven by servo motors 22 respectively, and the two servo motors 22 have a controller to control them to start and stop synchronously. The sleeves on both sides of the net tube 2 are driven by two independent servo motors to synchronously drive the transmission shaft heads 20 at both ends of the net tube 2 respectively, and the control accuracy reaches the thousandth level. The synchronization accuracy has reached the point type requirement, ensuring that the left, middle and right point types of the cloth surface are uniform and good.

[0039] The mirror surface pressure roller 1 uses a large diameter of 450mm, replacing the previous general diameter of 250mm. The diameter of the pressure roller 1 is larger than the diameter of the net tube 2. After the diameter of the pressure roller 1 is increased, the receiving surface is larger, the contact surface with the net tube 2 is more stable, the cloth surface is pulled out from between the two flat, and the slurry point transfer is more uniform and stable.

[0040] like Figure 5 The pulp point hole 19 is a gradual shape from an elliptical inlet 29 on the inner wall to a circular outlet 30 on the outer wall, and the major axis of the ellipse is parallel to the central axis of the mesh tube 2.

[0041] Embodiment 2:

[0042] like Figure 1 , 2 The slurry point coating unit assembly shown has a pressure-bearing transmission roller 1 and its driving rotating device, a slurry point mesh cylinder 2 and its driving rotating device; the pressure-bearing transmission roller 1 and the slurry point mesh cylinder 2 form a basically tangential upper and lower fit, and the slurry point mesh cylinder 2 is above the pressure-bearing roller 1; a fixed and non-rotating slurry tube 24 is provided inside the mesh cylinder 2, one end of the slurry tube 24 is connected to a liquid slurry source, and the side of the slurry tube 24 has a plurality of evenly distributed slurry outlet holes 26.

[0043] Inside the mesh cylinder 2, a scraper with a hollow structure is welded on the outer wall of one side of the slurry outlet hole 26 of the slurry pipe 24; the numerous evenly distributed slurry outlet holes 26 of the slurry pipe 24 first drip the slurry into the internal space of the inner scraper 25, and then discharge or flow out through the scraping holes at the lower end of the inner scraper 25, and drip or scrape onto the inner wall 18 of the mesh cylinder.

[0044] The two ends of the net cylinder 2 are respectively connected with fixed Figure 3 The transmission shaft heads 20 shown are driven by servo motors 22 respectively, and the two servo motors 22 have controllers to control them to start and stop synchronously.

[0045] like Figure 6 As shown, the pulp point hole 19 is a gradual shape from a rectangular inlet 31 to a square outlet 32, and the length direction of the rectangular inlet 31 is parallel to the central axis of the net tube 2. The middle wall between the inlet and the outlet is bulging, and the area of ​​the inlet and the outlet is the same.

Claims

1. A paste point coating unit assembly, comprising a pressure-bearing transmission roller (1) and a driving and rotating device thereof, a paste point mesh cylinder (2) and a driving and rotating device thereof; The slurry point mesh cylinder (2) is tangentially matched above the pressure roller (1); a fixed slurry pipe (24) is provided inside the slurry point mesh cylinder (2), one end of the slurry pipe (24) is connected to a liquid slurry source, and a plurality of evenly distributed slurry outlet holes (26) are provided at the bottom or side of the slurry pipe (24); The wall surface of the pulp point net cylinder (2) has a plurality of regularly arranged pulp point holes (19), and the pulp is then discharged from the pulp point holes and coated onto the cloth surface to form pulp point cloth; the two ends of the pulp point net cylinder (2) respectively have a fixedly connected net cylinder sleeve (3) or a transmission shaft head (20), the two net cylinder sleeves (3) or the transmission shaft heads (20) are respectively driven by servo motors (22), and the two servo motors (22) have controllers to control them to start and stop synchronously; The inlet and outlet areas of the slurry point hole (19) are the same; the characteristics are: Inside the slurry point mesh cylinder (2), an inner scraper (25) with a hollow structure is welded on the outer wall of the slurry tube (24) on the side where the slurry outlet hole (26) is located, and the blade of the inner scraper (25) is parallel to the central axis of the mesh cylinder; when the slurry is evenly discharged from the inside of the inner scraper (25), a slurry scraping action is formed between the inner scraper (25) and the inner wall (18) of the mesh cylinder; The pulp point hole (19) is a gradual change in shape from an elliptical inlet (29) on the inner wall to a circular outlet (30) on the outer wall, and the major axis of the ellipse is parallel to the central axis of the net tube; or, the pulp point hole (19) is a gradual change in shape from a rectangular inlet (31) to a square outlet (32), and the length direction of the rectangular inlet (31) is parallel to the central axis of the net tube; The intermediate wall surface between the inlet and the outlet of the slurry point hole (19) is in a bulging shape.

2. The slurry point coating unit assembly according to claim 1, characterized in that: There is an expansion roller (4) before or after the pulp point mesh cylinder (2) for spreading the cloth evenly.

3. The slurry point coating unit assembly according to claim 1 or 2, characterized in that: The slurry is discharged from the slurry outlet hole (26), drips into the inner space of the inner scraper (25), and then discharged through the scraping hole at the lower end of the inner scraper (25), and scraped onto the inner wall (18) of the mesh cylinder.

4. The slurry point coating unit assembly according to claim 1 or 2, characterized in that: The diameter of the pressure roller (1) is greater than the diameter of the pulp point mesh cylinder (2).

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