A slurry coating apparatus for the production of medical hydrogels

Abstract

A slurry coating device for the production of medical hydrogels, relating to the technical field of hydrogel production equipment, includes a frame. A PLC controller is mounted on the side of the frame. A coating roller is rotatably connected to the inner side of the frame via a first bearing. A heat exchange channel is provided on the inner side of the coating roller. An air guide chamber communicating with the interior of the heat exchange channel is opened on the frame. A blower pipe communicating with the middle of the heat exchange channel is fixed on the inner side of the coating roller. The blower pipe is coaxially arranged with the coating roller and rotatably connected to the frame via a second bearing. This slurry coating device for the production of medical hydrogels can uniformly heat the coating roller, avoiding the slurry from becoming too viscous and solidifying due to excessively low temperature, thus ensuring the normal operation of the coating process. It also avoids the difficulty of scraping off the scraper caused by the slurry sticking to the coating roller due to excessively low temperature, and can shake off the slurry accumulated on the scraper, achieving self-cleaning of the scraper.

Description

Technical Field

[0001] This invention relates to the field of hydrogel production equipment technology, and in particular to a slurry coating device for the production of medical hydrogels. Background Technology

[0002] Hydrogels are polymeric materials with a three-dimensional network structure. Due to their excellent biocompatibility, high water content, and extracellular matrix-like structure, they have broad application prospects in medical dressings, tissue engineering, drug delivery, and biosensing. Currently, medical hydrogel products are typically manufactured using a coating molding process, in which hydrogel slurry is uniformly coated onto the surface of substrates such as nonwoven fabrics, elastic fabrics, and release films, and then dried and cross-linked to form a gel patch product.

[0003] The following technical challenges exist in the coating and production process of medical hydrogels: First, hydrogel slurries typically have high water content and high viscosity. During the coating process, the viscosity can easily increase due to temperature drops, causing the slurry to solidify and clump on the coating roller surface, affecting coating uniformity and the normal operation of the doctor blade. Most existing coating devices lack effective coating roller heating mechanisms, making it difficult to ensure that the slurry maintains suitable temperature and viscosity during the coating process.

[0004] Secondly, during the process of scraping off excess slurry from the coating roller surface for an extended period, the slurry tends to accumulate near the scraper. If not removed in time, the accumulated slurry will gradually harden, causing the scraper to malfunction and affecting the coating quality. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a slurry coating device for the production of medical hydrogels. It can uniformly heat the coating roller to avoid the slurry from becoming too viscous and solidifying due to low temperature, thus ensuring the normal operation of the coating process. At the same time, it can also avoid the difficulty of scraping off the doctor blade caused by the slurry sticking to the coating roller due to low temperature. It can shake off the slurry accumulated on the doctor blade, realizing the self-cleaning of the doctor blade, which can effectively solve the problems in the background art.

[0006] To achieve the aforementioned objective, the present invention employs the following technical solution: A slurry coating apparatus for the production of medical hydrogels includes a frame. A PLC controller is mounted on the side of the frame. A coating roller is rotatably connected to the inner side of the frame via a first bearing. A heat exchange channel is provided on the inner side of the coating roller. An air guide chamber communicating with the interior of the heat exchange channel is opened on the frame. A blower pipe communicating with the middle of the heat exchange channel is fixed to the inner side of the coating roller. The blower pipe is coaxially arranged with the coating roller and rotatably connected to the frame via a second bearing. A hot air fan is mounted on the top of the frame. An air outlet pipe is fixedly connected to the air outlet of the hot air fan, and the end of the air outlet pipe is connected to a rotary joint. The blower duct rotates and connects. The head of the frame is connected to an exhaust hood via an elastic mechanism. The exhaust hood is connected to the interior of the air guide chamber via a conveying pipe. A vibration generator is installed on the inner side of the exhaust hood. A blade holder is fixed on the exhaust hood. A scraper is installed on the blade holder. The scraper is in contact with the surface of the coating roller. A position adjustment mechanism is installed at the tail of the frame. A mounting base is fixed on the adjustment part of the position adjustment mechanism. A pressure roller is rotatably installed on the inner side of the mounting base. The pressure roller is correspondingly arranged with the coating roller. The PLC controller is electrically connected to an external power supply. The hot air blower is electrically connected to the PLC controller.

[0007] Furthermore, the position adjustment mechanism includes a servo motor, a bidirectional lead screw, a transmission seat, and a guide rail. The output shaft of the servo motor is connected to the bidirectional lead screw. The transmission seat is threadedly engaged with the bidirectional lead screw and slidably mounted on the guide rail. The end of the guide rail is fixedly connected to the frame. The bidirectional lead screw is rotatably mounted on the inner side of the frame. The servo motor is mounted on the side of the frame and is electrically connected to the PLC controller.

[0008] Furthermore, the position adjustment mechanism also includes a first hinge seat, a transmission rod, and a second hinge seat. One end of the transmission rod is hinged to the mounting base via the first hinge seat, and the other end of the transmission rod is hinged to the transmission base via the second hinge seat.

[0009] Furthermore, it also includes a measuring rod and a guide seat. The guide seat is fixed on the frame, and the measuring rod is slidably disposed in the guide seat with one end fixedly connected to the mounting base. The measuring rod is provided with a scale for displaying the size of the coating gap.

[0010] Furthermore, the heat exchange channel has a spiral structure, extending from the middle of the coating roller to both ends.

[0011] Furthermore, the middle part of the conveying pipe has a corrugated pipe structure.

[0012] Furthermore, the connection between the delivery pipe and the exhaust hood is tangentially oriented.

[0013] Furthermore, the vibration generating device includes a rotating shaft, a turbine, and a pendulum. The turbine is rotatably mounted inside the exhaust shroud via the rotating shaft, and the pendulum is fixed to the outer end of the rotating shaft.

[0014] Furthermore, the elastic mechanism includes a slider, a guide rod, and a spring. The end of the guide rod is fixedly connected to the frame, the slider is slidably sleeved on the guide rod, and the spring is sleeved on the guide rod with one end abutting against the frame and the other end abutting against the slider.

[0015] Furthermore, the elastic mechanism also includes a connecting rod, a first hinge, and a second hinge. One end of the connecting rod is hinged to the slider via the first hinge, and the other end of the connecting rod is hinged to the exhaust hood via the second hinge.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. By incorporating a spiral heat exchange channel inside the coating roller and introducing hot air into the channel using a hot air blower, uniform heating of the coating roller is achieved. Hot air enters from the blower pipe in the middle of the coating roller and flows towards both ends along the spiral channel, ensuring a uniform temperature distribution throughout the coating roller. After heating, the coating roller maintains the hydrogel slurry within a suitable temperature range during coating, preventing the slurry from becoming too viscous, solidifying, or clumping due to low temperature. This ensures the normal operation of the coating process and also avoids the difficulty of scraping off the slurry with a doctor blade if it becomes too cold and adheres tightly to the coating roller.

[0017] 2. The hot air after heat exchange is introduced into the exhaust hood, and the kinetic energy of the hot air is used to drive the turbine to rotate, which in turn drives the pendulum to swing and generate vibration. This vibration is transmitted to the scraper through the exhaust hood and the blade holder, causing the scraper to generate high-frequency micro-amplitude vibration, thereby shaking off the slurry accumulated on the scraper and realizing the self-cleaning of the scraper. This design does not require an additional vibration drive source and makes full use of waste heat air energy.

[0018] 3. The exhaust hood is connected to the frame through an elastic mechanism. The spring in the elastic mechanism can provide a restoring force for the exhaust hood, which, together with the vibration generator, forms a continuous reciprocating vibration, ensuring the effect of the scraper shaking off the slurry. At the same time, the middle part of the conveying pipe adopts a corrugated pipe structure, which can adapt to the vibration of the exhaust hood and ensure the continuity of hot air delivery. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional side structure of the present invention; Figure 3 This is a schematic diagram of the first three-dimensional cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the three-dimensional second cross-sectional structure of the present invention; Figure 5 For the present invention Figure 4 A magnified structural diagram at point A.

[0020] In the diagram: 1-Frame, 2-Air outlet, 3-Elastic mechanism, 31-Slider, 32-Guide rod, 33-Spring, 34-Connecting rod, 35-First hinge, 36-Second hinge, 4-Position adjustment mechanism, 41-Servo motor, 42-First hinge seat, 43-Double-actuated screw, 44-Transmission seat, 45-Guide rail, 46-Transmission rod, 47-Second hinge seat, 5-Vibration generator, 51-Rotating shaft, 52-Turbine, 53-Pendulum, 6-PLC controller, 7-Exhaust hood, 8-Knife holder, 9-Coating roller, 10-First bearing, 11-Mounting seat, 12-Pressure roller, 13-Guide seat, 14-Measuring rod, 15-Air chamber, 16-Conveying pipe, 17-Heat exchange channel, 18-Blower pipe, 19-Second bearing, 20-Rotary joint, 21-Air outlet pipe, 22-Hot air blower, 23-Scraper. Detailed Implementation

[0021] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0022] Please see Figure 1-5 This embodiment provides a technical solution: a slurry coating device for the production of medical hydrogels, including a frame 1, a PLC controller 6 mounted on the side of the frame 1, a coating roller 9 rotatably connected to the inner side of the frame 1 via a first bearing 10, a heat exchange channel 17 provided on the inner side of the coating roller 9, an air guide chamber 15 communicating with the interior of the heat exchange channel 17 on the frame 1, a blower pipe 18 communicating with the middle of the heat exchange channel 17 fixed on the inner side of the coating roller 9, the blower pipe 18 being coaxially arranged with the coating roller 9 and rotatably connected to the frame 1 via a second bearing 19, a hot air fan 22 mounted on the top of the frame 1, an air outlet pipe 21 fixedly connected to the air outlet position of the hot air fan 22, and the end of the air outlet pipe 21... The unit is rotatably connected to the blower pipe 18 via a rotary joint 20. The head of the frame 1 is connected to an exhaust hood 7 via an elastic mechanism 3. The exhaust hood 7 is connected to the interior of the air guide chamber 15 via a conveying pipe 16. A vibration generating device 5 is installed on the inner side of the exhaust hood 7. A knife holder 8 is fixed on the exhaust hood 7. A scraper 23 is installed on the knife holder 8. The scraper 23 is in contact with the surface of the coating roller 9. A position adjustment mechanism 4 is installed at the tail of the frame 1. A mounting base 11 is fixed on the adjustment part of the position adjustment mechanism 4. A pressure roller 12 is rotatably installed on the inner side of the mounting base 11. The pressure roller 12 is correspondingly arranged with the coating roller 9. The PLC controller 6 is electrically connected to an external power supply. The hot air blower 22 is electrically connected to the PLC controller 6.

[0023] Once the coating roller 9 reaches the set temperature and the coating gap is adjusted, the substrate is drawn out from the unwinding assembly, passes through the gap between the coating roller 9 and the pressure roller 12, and is pulled by the rewinding assembly. The hydrogel slurry is conveyed to the upstream side of the coating roller 9 through the feeding system (not shown in detail in this figure) and adheres to the surface of the rotating coating roller 9. The coating roller 9 is driven to rotate by an external drive motor (not shown in the figure), and its rotation direction is the same as or opposite to the substrate movement direction (selected according to the coating process). When the slurry carried on the surface of the coating roller 9 passes through the doctor blade 23, the doctor blade 23 scrapes off the excess slurry, leaving only a slurry layer of uniform thickness on the surface of the coating roller 9. Subsequently, the coating roller 9 transfers the slurry to the substrate surface it contacts, forming a wet coating. The pressure roller 12 provides reverse support force to ensure close contact between the substrate and the coating roller 9, ensuring uniform transfer.

[0024] The position adjustment mechanism 4 includes a servo motor 41, a bidirectional lead screw 43, a transmission seat 44, and a guide rail 45. The output shaft of the servo motor 41 is connected to the bidirectional lead screw 43. The transmission seat 44 is threadedly engaged with the bidirectional lead screw 43 and slidably mounted on the guide rail 45. The end of the guide rail 45 is fixedly connected to the frame 1. The bidirectional lead screw 43 is rotatably mounted on the inner side of the frame 1. The servo motor 41 is mounted on the side of the frame 1 and electrically connected to the PLC controller 6. The position adjustment mechanism 4 also includes a first hinge seat 42, a transmission rod 46, and a second hinge seat 47. One end of the transmission rod 46 is hinged to the mounting base 11 through the first hinge seat 42, and the other end of the transmission rod 46 is hinged to the transmission seat 44 through the second hinge seat 47. It also includes a measuring rod 14 and a guide seat 13, which is fixed to the frame 1. The measuring rod 14 is slidably disposed in the guide seat 13 and one end is fixedly connected to the mounting seat 11. The measuring rod 14 is provided with a scale for displaying the size of the coating gap. The PLC controller 6 sends a pulse command to the servo motor 41 according to the preset coating thickness parameters. The output shaft of the servo motor 41 drives the bidirectional lead screw 43 to rotate. The bidirectional lead screw 43 is threadedly engaged with the transmission seat 44. The transmission seat 44 slides in a straight line under the constraint of the guide rail 45. The transmission seat 44 drives the mounting seat 11 to move through the transmission rod 46. Since the two ends of the transmission rod 46 are respectively hinged to the mounting seat 11 and the transmission seat 44 through the first hinge seat 42 and the second hinge seat 47, the mounting seat 11 can smoothly approach or move away from the coating roller 9. The pressure roller 12 is rotatably mounted on the mounting seat 11, so the pressure roller 12 moves accordingly, and the coating gap changes accordingly.

[0025] During the gap adjustment process, the measuring rod 14, which is fixedly connected to the mounting base 11, moves synchronously and slides within the guide seat 13. The operator can directly read the current coating gap value through the scale on the measuring rod 14 for equipment calibration or manual fine-tuning.

[0026] The heat exchange channel 17 has a spiral structure, extending from the middle of the coating roller 9 to both ends. Hot air generated by the hot air blower 22 passes sequentially through the air outlet duct 21 and the rotary joint 20 into the blower duct 18. The blower duct 18 is coaxially fixed with the coating roller 9, and its outlet is located in the middle of the heat exchange channel 17 inside the coating roller 9. The heat exchange channel 17 has a spiral structure, extending spirally from the middle of the coating roller 9 to both ends. After entering from the middle of the heat exchange channel 17, the hot air, guided by the spiral channel, splits into two paths, flowing towards the left and right ends of the coating roller 9 respectively. The hot air flows along the spiral channel... During the process, the hot air fully exchanges heat with the metal wall of the coating roller 9, and the heat is evenly transferred to the entire coating roller 9. Since the hot air flows from the middle to both ends, and the spiral channel ensures that the contact area and flow path length between the hot air and the roller are consistent, the surface temperature of the coating roller 9 can be kept highly uniform. After heating, the coating roller 9 continues to keep the hydrogel slurry warm during the subsequent coating process, preventing the slurry from suddenly increasing in viscosity or locally gelling due to contact with the low temperature roller surface. After the heat exchange is completed, the temperature of the hot air is reduced and discharged from the exhaust ports at both ends of the heat exchange channel 17 and enters the air guide chamber 15 opened on the frame 1.

[0027] The middle part of the conveying pipe 16 is a corrugated pipe structure, which can adapt to the vibration of the exhaust hood 7 and ensure the continuity of hot air delivery. The connection between the conveying pipe 16 and the exhaust hood 7 is tangential. The vibration generating device 5 includes a rotating shaft 51, a turbine 52, and a pendulum 53. The turbine 52 is rotatably mounted inside the exhaust hood 7 via the rotating shaft 51. The pendulum 53 is fixed to the outer end of the rotating shaft 51. The elastic mechanism 3 includes a slider 31, a guide rod 32, and a spring 33. The end of the guide rod 32 is fixedly connected to the frame 1. The slider 31 is slidably sleeved on the guide rod 32. The spring 33... The elastic mechanism 3, fitted onto the guide rod 32 with one end abutting against the frame 1 and the other end abutting against the slider 31, also includes a connecting rod 34, a first hinge 35, and a second hinge 36. One end of the connecting rod 34 is hinged to the slider 31 via the first hinge 35, and the other end of the connecting rod 34 is hinged to the exhaust hood 7 via the second hinge 36. During the long-term scraping of slurry by the scraper 23, a small amount of slurry will inevitably accumulate on the slurry-facing surface (i.e., the upstream side of the scraper) and near the cutting edge. If not removed in time, the accumulated slurry will harden and clump, causing the scraper to fail. The hot air in the air guide chamber 15 (which has already heated the coating roller 9) enters the exhaust hood 7 through the conveying pipe 16. The connection between the conveying pipe 16 and the exhaust hood 7 is tangential, so the hot air enters the exhaust hood 7 at high speed in a tangential direction, directly impacting the turbine 52 blades installed inside the exhaust hood 7. The kinetic energy of the hot air drives the turbine 52 to rotate around the rotating shaft 51. A pendulum 53 is fixed to the outer end of the rotating shaft 51. When the rotating shaft 51 drives the pendulum 53 to rotate, the pendulum 53 generates centrifugal force. Since the pendulum 53 is not perfectly symmetrical, the rotation of the pendulum 53 will cause the entire exhaust hood 7 to vibrate periodically. The exhaust hood 7 is connected to the frame 1 through the elastic mechanism 3: the exhaust hood 7 is connected to the slider 31 through the connecting rod 34, the first hinge 35, and the second hinge 36. The slider 31 is hinged and slidably mounted on the guide rod 32 and held in place by the spring 33. When the pendulum 53 rotates and vibrates, the exhaust hood 7 is displaced, which pushes the slider 31 along the guide rod 32 and compresses the spring 33 via the connecting rod 34. The spring 33 then pushes the slider 31 back to its original position, forming a reciprocating vibration. This mechanical vibration is transmitted to the scraper 23 via the blade holder 8, causing the scraper 23 to vibrate slightly. The vibration of the scraper 23 breaks the adhesion between the slurry and the blade surface, causing the slurry accumulated on the scraper to be "shaken off" and drip into the external receiving tray. Due to the reset action of the elastic mechanism 3 and the continuous rotation of the pendulum 53, the scraper 23 can achieve continuous and automatic vibration cleaning without the need for manual cleaning during machine shutdown, which significantly improves the continuous operation capability of the equipment.

[0028] The hot air from the turbine 52 after it has completed its work is discharged from the outside of the equipment through the air outlet 2 opened on the side of the exhaust hood 7. The number and diameter of the air outlet 2 can be designed as needed to control the exhaust back pressure and airflow speed. The discharged hot air can be connected to the workshop ventilation system or further recover waste heat.

[0029] The working principle of the slurry coating device for the production of medical hydrogels provided by the present invention is as follows: the hot air generated by the hot air blower 22 passes through the air outlet 21 and the rotary joint 20 and enters the blower pipe 18. The blower pipe 18 is coaxially fixed with the coating roller 9, and its outlet is located in the middle of the heat exchange channel 17 inside the coating roller 9. The heat exchange channel 17 has a spiral structure and extends spirally from the middle of the coating roller 9 to both ends. After the hot air enters from the middle of the heat exchange channel 17, it is divided into two paths and flows to the two ends of the coating roller 9 under the guidance of the spiral channel. During the flow of the hot air along the spiral channel, it fully exchanges heat with the metal wall of the coating roller 9 and evenly transfers the heat to the entire coating roller 9.

[0030] Because the hot air flows from the middle to both ends, and the spiral channel ensures that the contact area and flow path length between the hot air and the roller are consistent, the temperature of the coating roller 9 surface can be kept highly uniform. After heating, the coating roller 9 continues to keep the hydrogel slurry warm during the subsequent coating process, preventing the slurry from suddenly increasing in viscosity or locally gelling due to contact with the low temperature roller surface. After the heat exchange is completed, the temperature of the hot air is reduced and discharged from the exhaust ports at both ends of the heat exchange channel 17, and enters the air guide chamber 15 opened on the frame 1.

[0031] According to the preset coating thickness parameters, the PLC controller 6 sends pulse commands to the servo motor 41. The output shaft of the servo motor 41 drives the bidirectional lead screw 43 to rotate. The bidirectional lead screw 43 is threadedly engaged with the transmission seat 44. The transmission seat 44 slides in a straight line under the constraint of the guide rail 45. The transmission seat 44 drives the mounting seat 11 to move through the transmission rod 46. Since the two ends of the transmission rod 46 are respectively hinged to the mounting seat 11 and the transmission seat 44 through the first hinge seat 42 and the second hinge seat 47, the mounting seat 11 can smoothly approach or move away from the coating roller 9. The pressure roller 12 is rotated and mounted on the mounting seat 11. Therefore, the pressure roller 12 moves accordingly, and the coating gap changes accordingly.

[0032] During the gap adjustment process, the measuring rod 14, which is fixedly connected to the mounting base 11, moves synchronously and slides within the guide seat 13. The operator can directly read the current coating gap value through the scale on the measuring rod 14 for equipment calibration or manual fine-tuning.

[0033] Once the coating roller 9 reaches the set temperature and the coating gap is adjusted, the substrate is drawn out from the unwinding assembly, passes through the gap between the coating roller 9 and the pressure roller 12, and is pulled by the rewinding assembly. The hydrogel slurry is conveyed to the upstream side of the coating roller 9 through the feeding system (not shown in detail in this figure) and adheres to the surface of the rotating coating roller 9. The coating roller 9 is driven to rotate by an external drive motor (not shown in the figure), and its rotation direction is the same as or opposite to the substrate movement direction (selected according to the coating process). When the slurry carried on the surface of the coating roller 9 passes through the doctor blade 23, the doctor blade 23 scrapes off the excess slurry, leaving only a slurry layer of uniform thickness on the surface of the coating roller 9. Subsequently, the coating roller 9 transfers the slurry to the substrate surface it contacts, forming a wet coating. The pressure roller 12 provides reverse support force to ensure close contact between the substrate and the coating roller 9, ensuring uniform transfer.

[0034] During the long-term scraping of slurry, a small amount of slurry will inevitably accumulate on the slurry-facing side (i.e., the upstream side of the scraper) and near the cutting edge of the scraper 23. If it is not removed in time, the accumulated slurry will harden and clump, causing the scraper to fail. The hot air in the air guide chamber 15 (which has already heated the coating roller 9) enters the exhaust hood 7 through the conveying pipe 16. The connection between the conveying pipe 16 and the exhaust hood 7 is tangential, so the hot air enters the exhaust hood 7 at high speed in a tangential direction, directly impacting the turbine 52 blades installed inside the exhaust hood 7. The kinetic energy of the hot air drives the turbine 52 to rotate around the rotating shaft 51. A pendulum 53 is fixed to the outer end of the rotating shaft 51. When the rotating shaft 51 drives the pendulum 53 to rotate, the pendulum 53 generates centrifugal force. Since the pendulum 53 is not perfectly symmetrical, the rotation of the pendulum 53 will cause the entire exhaust hood 7 to vibrate periodically. The exhaust hood 7 is connected to the frame 1 through the elastic mechanism 3: the exhaust hood 7 is connected to the slider 31 through the connecting rod 34, the first hinge 35, and the second hinge 36. The slider 31 is hinged and slidably mounted on the guide rod 32 and held in place by the spring 33. When the pendulum 53 rotates and vibrates, the exhaust hood 7 is displaced, which pushes the slider 31 along the guide rod 32 and compresses the spring 33 via the connecting rod 34. The spring 33 then pushes the slider 31 back to its original position, forming a reciprocating vibration. This mechanical vibration is transmitted to the scraper 23 via the blade holder 8, causing the scraper 23 to vibrate slightly. The vibration of the scraper 23 breaks the adhesion between the slurry and the blade surface, causing the slurry accumulated on the scraper to be "shaken off" and drip into the external receiving tray. Due to the reset action of the elastic mechanism 3 and the continuous rotation of the pendulum 53, the scraper 23 can achieve continuous and automatic vibration cleaning without the need for manual cleaning during machine shutdown, which significantly improves the continuous operation capability of the equipment.

[0035] The hot air from the turbine 52 after it has completed its work is discharged from the outside of the equipment through the air outlet 2 opened on the side of the exhaust hood 7. The number and diameter of the air outlet 2 can be designed as needed to control the exhaust back pressure and airflow speed. The discharged hot air can be connected to the workshop ventilation system or further recover waste heat.

[0036] It is worth noting that the components disclosed in the above embodiments are all general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods. The hot air blower 22 and the servo motor 41 are both products currently on the market. Their structures and principles are known technologies. This solution only describes their role in this solution and the technical effects to be produced. The PLC controller 6 model is Huichuan H3U-1616MT.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances; for example, a rotary connection can refer to a rotary connection via a bearing.

[0038] The parts of this invention not described in detail are prior art. Although the invention has been specifically shown and introduced in conjunction with preferred embodiments, there are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of the invention. However, those skilled in the art should understand that various changes in form and detail can be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the invention.

Claims

1. A slurry coating apparatus for the production of medical hydrogels, comprising a frame (1), characterized in that: A PLC controller (6) is installed on the side of the frame (1). A coating roller (9) is rotatably connected to the inner side of the frame (1) via a first bearing (10). A heat exchange channel (17) is provided on the inner side of the coating roller (9). An air guide chamber (15) communicating with the interior of the heat exchange channel (17) is opened on the frame (1). A blower pipe (18) communicating with the middle of the heat exchange channel (17) is fixed on the inner side of the coating roller (9). The blower pipe (18) is coaxially arranged with the coating roller (9) and rotatably connected to the frame (1) via a second bearing (19). A hot air blower (22) is installed on the top of the frame (1). An air outlet pipe (21) is fixedly connected to the air outlet position of the hot air blower (22). The end of the air outlet pipe (21) is rotatably connected to the blower pipe (18) via a rotary joint (20). The head of the frame (1) is connected to an exhaust hood (7) via an elastic mechanism (3). The exhaust hood (7) is connected to the interior of the air guide chamber (15) via a conveying pipe (16). A vibration generator (5) is installed on the inner side of the exhaust hood (7). A knife holder (8) is fixed on the exhaust hood (7). A scraper (23) is installed on the knife holder (8). The scraper (23) is in contact with the surface of the coating roller (9). A position adjustment mechanism (4) is installed at the tail of the frame (1). A mounting seat (11) is fixed on the adjustment part of the position adjustment mechanism (4). A pressure roller (12) is rotatably installed on the inner side of the mounting seat (11). The pressure roller (12) is correspondingly arranged with the coating roller (9). The PLC controller (6) is electrically connected to an external power supply. The hot air blower (22) is electrically connected to the PLC controller (6).

2. The slurry coating apparatus for the production of medical hydrogels according to claim 1, characterized in that: The position adjustment mechanism (4) includes a servo motor (41), a bidirectional lead screw (43), a transmission seat (44), and a guide rail (45). The output shaft of the servo motor (41) is connected to the bidirectional lead screw (43). The transmission seat (44) is threadedly engaged with the bidirectional lead screw (43) and slidably mounted on the guide rail (45). The end of the guide rail (45) is fixedly connected to the frame (1). The bidirectional lead screw (43) is rotatably mounted on the inner side of the frame (1). The servo motor (41) is mounted on the side of the frame (1). The servo motor (41) is electrically connected to the PLC controller (6).

3. The slurry coating apparatus for the production of medical hydrogels according to claim 2, characterized in that: The position adjustment mechanism (4) further includes a first hinge seat (42), a transmission rod (46), and a second hinge seat (47). One end of the transmission rod (46) is hinged to the mounting base (11) through the first hinge seat (42), and the other end of the transmission rod (46) is hinged to the transmission base (44) through the second hinge seat (47).

4. The slurry coating apparatus for the production of medical hydrogels according to claim 1, characterized in that: It also includes a measuring rod (14) and a guide seat (13), the guide seat (13) being fixed on the frame (1), the measuring rod (14) being slidably disposed in the guide seat (13) and one end being fixedly connected to the mounting base (11), and the measuring rod (14) being provided with a scale for displaying the size of the coating gap.

5. A slurry coating apparatus for the production of medical hydrogels according to claim 1, characterized in that: The heat exchange channel (17) has a spiral structure and extends from the middle of the coating roller (9) to both ends.

6. The slurry coating apparatus for the production of medical hydrogels according to claim 1, characterized in that: The middle part of the conveying pipe (16) is a corrugated pipe structure.

7. A slurry coating apparatus for the production of medical hydrogels according to claim 1, characterized in that: The connection between the delivery pipe (16) and the exhaust hood (7) is tangential.

8. The slurry coating apparatus for the production of medical hydrogels according to claim 1, characterized in that: The vibration generating device (5) includes a rotating shaft (51), a turbine (52) and a pendulum (53). The turbine (52) is rotatably mounted inside the exhaust hood (7) via the rotating shaft (51), and the pendulum (53) is fixed to the outer end of the rotating shaft (51).

9. A slurry coating apparatus for the production of medical hydrogels according to claim 1, characterized in that: The elastic mechanism (3) includes a slider (31), a guide rod (32) and a spring (33). The end of the guide rod (32) is fixedly connected to the frame (1). The slider (31) is slidably sleeved on the guide rod (32). The spring (33) is sleeved on the guide rod (32) with one end abutting against the frame (1) and the other end abutting against the slider (31).

10. A slurry coating apparatus for the production of medical hydrogels according to claim 9, characterized in that: The elastic mechanism (3) further includes a connecting rod (34), a first hinge (35) and a second hinge (36). One end of the connecting rod (34) is hinged to the slider (31) through the first hinge (35), and the other end of the connecting rod (34) is hinged to the exhaust hood (7) through the second hinge (36).

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