A kind of screed device and inkjet type 3D printer using spring force to compress doctor blade

Abstract

The utility model discloses a kind of levelling device and ink-jet type 3D printer using spring force to press scraper, including scraper holder and scraper;Two ends of scraper holder are rotatably arranged on mounting bracket by bearing one;Scraper is fixedly installed on scraper holder, and the cutting edge of scraper is in contact with the surface of levelling roller;It further include elastic pressing mechanism, and elastic pressing mechanism is located between scraper holder and mounting bracket;Elastic pressing mechanism acts on scraper holder, to apply elastic pressing force to levelling roller to scraper;Scraper holder is adaptively swung around bearing one axis under the action of elastic pressing mechanism.The utility model provides continuous stable elastic pressing force for scraper by the design of elastic pressing mechanism, so that scraper is always adhered to levelling roller surface under the action of elastic pressing force, while allowing scraper holder to swing around bearing one axis adaptively, effectively absorb equipment vibration, compensate the influence of levelling roller cylindricity error and thermal deformation, so as to significantly improve ink scraping uniformity and printing quality.

Description

Technical Field

[0001] This utility model belongs to the field of printing press scraper technology, specifically relating to a leveling device that uses spring force to press the scraper and an inkjet 3D printer. Background Technology

[0002] In inkjet 3D printers (such as wax-print 3D printers), the leveling device is one of the key components ensuring print quality. Its main function is to level the inkjet layers, which vary in thickness at different points, using leveling rollers, and to remove excess ink adhering to the surface of the leveling rollers using a doctor blade, thereby ensuring a consistent layer thickness. Traditional leveling devices typically employ a rigid, fixed doctor blade holder structure, such as using a worm gear mechanism to adjust the position and pressure of the doctor blade. During operation, the worm gear is manually rotated to move the doctor blade holder to the desired position, and then both ends of the doctor blade holder are mechanically locked in place.

[0003] This rigid locking structure, because the doctor blade holder is completely fixed, cannot effectively compensate for vibrations generated during equipment operation (such as motor operation, airflow disturbance, thermal expansion and contraction caused by temperature changes), as well as manufacturing errors of the leveling roller itself (such as cylindricity deviation, surface unevenness, etc.). This results in uneven contact pressure distribution between the doctor blade and the leveling roller, easily leading to local ink leakage or over-scraping, affecting printing quality. In addition, the rigid locking structure is prone to stress concentration after long-term use, deteriorating the doctor blade adhesion, and is cumbersome to disassemble and maintain, with low debugging efficiency. Utility Model Content

[0004] The purpose of this invention is to solve the aforementioned technical problems in the prior art, and to provide a leveling device and inkjet 3D printer that utilizes spring force to press the doctor blade. The design is reasonable and highly practical. Through the design of the elastic pressing mechanism, a continuous and stable elastic pressing force is provided to the doctor blade, ensuring that the doctor blade always adheres to the surface of the leveling roller under the action of the elastic pressing force. Simultaneously, it allows the doctor blade holder to adaptively swing around a bearing axis, effectively absorbing equipment vibration and compensating for the effects of leveling roller cylindricity error and thermal deformation. This significantly improves ink uniformity and printing quality, solving the problems of incomplete ink scraping, friction noise, and accelerated wear caused by traditional rigid locking structures. It achieves a significant improvement in ink scraping effect, extends the service life of the doctor blade and leveling roller, and simplifies the structure, making installation and debugging convenient, and improving the stability and reliability of equipment operation.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A leveling device that uses spring force to press a scraper includes a scraper holder, a scraper, and a mounting bracket. The two ends of the scraper holder are rotatably mounted on the mounting bracket via bearings. The scraper is fixedly mounted on the scraper holder, with its blade contacting the surface of the leveling roller. The device also includes an elastic pressing mechanism located between the scraper holder and the mounting bracket. The elastic pressing mechanism acts on the scraper holder to apply an elastic pressing force to the scraper, pressing it against the leveling roller. Under the action of the elastic pressing mechanism, the scraper holder adaptively oscillates around a bearing axis.

[0006] Furthermore, the doctor blade holder is provided with an installation slot, in which a liner, a doctor blade, and a doctor blade pressure plate are arranged sequentially from top to bottom. The liner, doctor blade, and doctor blade pressure plate are fixedly installed in the installation slot by a fixing screw. The end of the fixing screw extends into the installation slot and passes through the liner, doctor blade, and doctor blade pressure plate in sequence to connect with the doctor blade holder. In this layered clamping structure, the liner and doctor blade fit tightly together. The liner plays a supporting and pressure-dispersing role, which can effectively reduce the local deformation of the doctor blade under pressure and ensure that the doctor blade edge maintains uniform and stable contact with the leveling roller, thereby improving the uniformity and consistency of ink scraping. The through-type connection of the fixing screw ensures the assembly rigidity and prevents the doctor blade from loosening under vibration.

[0007] Furthermore, a waste ink channel is provided inside the doctor blade holder, and an ink discharge port is provided on the side of the doctor blade holder, which is connected to the waste ink channel. Several channel inlet holes are distributed along the length of the mounting groove, and the channel inlet holes penetrate the mounting groove and are connected to the waste ink channel. A side gap channel is formed between the channel inlet holes and the mounting groove. The design is ingenious and reasonable. The scraped waste ink can flow into the waste ink channel through the side gap channel formed between the channel inlet holes and the mounting groove, and then be discharged from the ink discharge port. This realizes the immediate and smooth collection and directional discharge of waste ink during the scraping process, effectively preventing waste ink from accumulating or splashing in the doctor blade holder area. It avoids problems such as printing pollution, deterioration of the doctor blade working environment, and difficulty in subsequent cleaning caused by ink residue, and ensures the cleanliness and stability of long-term continuous operation.

[0008] Furthermore, one end of the waste ink channel is a closed end, and the other end is an open end. The open end is located on the end face of the doctor blade holder. A sealing plug is installed at the open end of the waste ink channel. The design of the open end facilitates regular cleaning and maintenance of the inside of the waste ink channel, preventing waste ink from drying and clogging. The sealing plug ensures the airtightness of the waste ink collection system, preventing waste ink from leaking from the open end, and also facilitates actual disassembly and maintenance.

[0009] Furthermore, both ends of the scraper holder are equipped with elastic clamping mechanisms, which include a spring support one, a spring, and a spring support two. Spring support one is fixed to the scraper holder with screws, and spring support two is fixed to the mounting bracket with screws. Both spring support one and spring support two are equipped with positioning pins. The spring is limited and compressed between spring support one and spring support two. The two ends of the spring are positioned and sleeved on the corresponding positioning pins. The spring can also be replaced with a tension spring, torsion spring, or other elastic element. The positioning pins position and constrain the two ends of the spring to prevent it from becoming unstable and shifting during compression, providing a stable and centered elastic clamping force. This makes the clamping force on the scraper holder uniform and controllable, significantly improving the stability of the scraper's adaptive oscillation, ensuring stable and reliable clamping force and smooth oscillation. Spring support one is fixed to the scraper holder, and spring support two is fixed to the mounting bracket with screws, ensuring a firm and reliable installation and facilitating subsequent disassembly and maintenance.

[0010] Furthermore, a heating film is installed on the doctor blade holder, and a heating film pressure plate is pressed and covered on the heating film. The heating film pressure plate and the heating film are fixedly connected to the doctor blade holder by two fixing screws. The end of the two fixing screws passes through the heating film pressure plate and the heating film and connects to the doctor blade holder. The heating function of the heating film can control the temperature of the doctor blade and the ink accumulated nearby, effectively reducing the viscosity of high-viscosity ink, improving the ink flow, preventing the ink from cooling and solidifying at the doctor blade, and ensuring smooth ink scraping without residue. It is especially suitable for low temperature or high solid content ink conditions, improving the process adaptability of the device and the ink scraping quality. The heating film pressure plate ensures that the heating film and the doctor blade holder are tightly attached, improving the heat transfer efficiency.

[0011] Furthermore, a heating sleeve is installed throughout the leveling roller. Both ends of the heating sleeve are supported on the mounting bracket by heat insulation rings. A heating rod is installed inside the heating sleeve. The built-in heating system formed by the heating sleeve and the heating rod can heat the leveling roller evenly and efficiently, so that the surface temperature of the heated roller is stable and the ink is prevented from cooling and solidifying on the roller surface. Heat insulation rings are installed at the connection between the heating sleeve and the mounting bracket at both ends. The heat insulation rings isolate the heating sleeve from the mounting bracket, effectively blocking the conduction of heat to the bearing and the mounting bracket, reducing heat loss and protecting the bearing and other precision components from high temperature.

[0012] Furthermore, the heating sleeve is fixed to the mounting bracket by positioning screws. The end of the heating sleeve is provided with a positioning slot. The end of the positioning screw extends through the mounting bracket into the positioning slot to position the heating sleeve. The positioning screw and the positioning slot allow the heating sleeve to be accurately fixed to the mounting bracket. The positioning screw and the positioning slot are in clearance fit, which ensures the axial and circumferential positioning of the heating sleeve while allowing it to undergo slight displacement due to thermal expansion. This avoids the accumulation of thermal stress that could lead to structural deformation or damage, improves the thermal stability of the system, and extends its service life.

[0013] Furthermore, thermistors are installed on both the doctor blade holder and the heating sleeve. The design of the thermistors allows for real-time monitoring of the temperature in the doctor blade area and the core temperature of the leveling roller, ensuring that the ink can always remain in a molten state. This is crucial for improving printing quality, process repeatability, and preventing malfunctions caused by abnormal temperatures, thereby enhancing the stability and safety of the equipment.

[0014] Furthermore, the mounting bracket includes support one and support two. Support one includes upper support one and lower support one. The scraper frame is located between support two and upper support one, and the heating sleeve is located between support two and lower support one. Support one is designed as a split upper and lower support. After the upper support one and lower support one are positioned by a positioning surface, they are fixedly connected by screws. This greatly facilitates the daily maintenance, replacement and debugging of the scraper frame and heating sleeve. During maintenance, only upper support one needs to be removed to take out the scraper frame. There is no need to disassemble the entire equipment. The operation is simple and the assembly and maintenance process is greatly simplified, which effectively improves the efficiency and maintainability of the equipment.

[0015] An inkjet 3D printer includes the aforementioned leveling device that uses spring force to press the scraper.

[0016] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects: This utility model is reasonably designed and highly practical. Through the design of the elastic clamping mechanism, it provides a continuous and stable elastic clamping force to the doctor blade, ensuring that the doctor blade always adheres to the surface of the leveling roller under the action of the elastic clamping force. At the same time, it allows the doctor blade holder to swing adaptively around the bearing axis, effectively absorbing the effects of equipment vibration, compensating for the effects of leveling roller cylindricity error and thermal deformation, thereby significantly improving the uniformity of ink scraping and printing quality. It solves the problems of incomplete ink scraping, friction noise and accelerated wear caused by traditional rigid locking structures, achieving a significant improvement in ink scraping effect, extending the service life of the doctor blade and leveling roller, and simplifying the structure for convenient installation and debugging, thus improving the stability and reliability of equipment operation. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of a leveling device that uses spring force to press a scraper according to the present invention; Figure 2 This is a schematic diagram of the left side structure of this utility model; Figure 3 This is a schematic diagram of the bottom structure of this utility model. Figure 4 This is a schematic diagram showing the positional distribution of the ink outlet on the doctor blade holder in this utility model; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure of AA; Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure of BB; Figure 7 This is a schematic diagram of the installation structure of the heating resistor on the heating sleeve and scraper holder in this utility model; Figure 8 This is a schematic diagram of the scraper holder in this utility model; Figure 9 for Figure 8 A structural diagram from another perspective; Figure 10 This is a schematic diagram of the internal cross-sectional structure of the scraper holder in this utility model.

[0018] In the diagram: 1-Scraper holder; 2-Scraper; 3-Bearing 1; 4-Leveling roller; 5-Elastic clamping mechanism; 6-Mounting groove; 7-Liner plate; 8-Scraper pressure plate; 9-Fixing screw 1; 10-Waste ink channel; 11-Ink outlet; 12-Channel inlet hole; 13-Side clearance channel; 14-Sealing plug; 15-Compression spring bracket 1; 16-Compression spring; 17-Compression spring bracket 2; 18-Positioning pin; 19-Heating film; 20-Heating film pressure plate; 21-Fixing screw 2; 22-Heating sleeve; 23-Heating rod; 24-Heat insulation ring; 25-Thermistor; 26-Support 1; 27-Support 2; 28-Upper support 1; 29-Lower support 1; 30-Positioning screw; 31-Positioning slot hole; 32-Pulley; 33-Bearing 2. Detailed Implementation

[0019] like Figures 1 to 10 As shown, this utility model discloses a leveling device that utilizes spring force to press a scraper. It includes a scraper holder 1, a scraper 2, and a mounting bracket. Both ends of the scraper holder 1 are rotatably mounted on the mounting bracket via bearings 3, preferably deep groove ball bearings. The scraper 2 is fixedly mounted on the scraper holder 1, with its blade contacting the surface of the leveling roller 4. It also includes an elastic pressing mechanism 5, located between the scraper holder 1 and the mounting bracket. The elastic pressing mechanism 5 acts on the scraper holder 1 to apply an elastic pressing force to the scraper 2, pressing it against the leveling roller 4. Under the action of the elastic pressing mechanism 5, the scraper holder 1 adaptively oscillates around the axis of bearing 3. Both ends of the leveling roller 4 are equipped with bearings 33, also preferably deep groove ball bearings, and one end is connected to a multi-wedge pulley 32. The multi-wedge pulley 32 provides smooth, synchronous, and anti-slip power transmission, improving system stability.

[0020] The scraper holder 1 is provided with an installation slot 6. The mounting slot 6 contains, from top to bottom, a liner 7, a scraper blade 2, and a scraper blade pressure plate 8. The liner 7, scraper blade 2, and scraper blade pressure plate 8 are fixedly installed in the mounting slot 6 by fixing screws 9. The end of the fixing screws 9 extends into the mounting slot 6 and passes through the liner 7, scraper blade 2, and scraper blade pressure plate 8 in sequence to connect with the scraper holder 1. In this layered clamping structure, the liner 7 fits tightly with the scraper blade 2. The liner 7 plays a supporting and pressure-dispersing role, which can effectively reduce the local deformation of the scraper blade 2 under pressure and ensure that the cutting edge of the scraper blade 2 maintains uniform and stable contact with the leveling roller 4, thereby improving the uniformity and consistency of ink scraping. The through connection of the fixing screws 9 ensures the rigidity of the assembly and prevents the scraper blade 2 from loosening under vibration.

[0021] The doctor blade holder 1 is equipped with a waste ink channel 10, and the side of the doctor blade holder 1 is equipped with an ink discharge port 11, which is connected to the waste ink channel 10. Several channel inlet holes 12 are distributed along the length of the mounting groove 6. The channel inlet holes 12 penetrate the mounting groove 6 and are connected to the waste ink channel 10. A side gap channel 13 is formed between the channel inlet holes 12 and the mounting groove 6. The design is ingenious and reasonable. The scraped waste ink can flow into the waste ink channel 10 through the side gap channel 13 formed between the channel inlet holes 12 and the mounting groove 6, and be discharged from the ink discharge port 11. This realizes the immediate and smooth collection and directional discharge of waste ink during the scraping process, effectively preventing waste ink from accumulating or splashing in the doctor blade holder area, avoiding problems such as printing pollution caused by ink residue, deterioration of the working environment of the doctor blade 2, and difficulty in subsequent cleaning, and ensuring the cleanliness and stability of long-term continuous operation.

[0022] One end of the waste ink channel 10 is a closed end, and the other end is an open end. The open end is located on the end face of the doctor blade holder 1. A sealing plug 14 is provided at the open end of the waste ink channel 10. The design of the open end facilitates regular cleaning and maintenance of the inside of the waste ink channel 10, preventing waste ink from drying and clogging. The sealing plug 14 can ensure the airtightness of the waste ink collection system, prevent waste ink from leaking from the open end, and also facilitate actual disassembly and maintenance.

[0023] Both ends of the scraper holder 1 are equipped with elastic clamping mechanisms 5. Each elastic clamping mechanism 5 includes a first spring bracket 15, a spring 16, and a second spring bracket 17. The first spring bracket 15 is screwed to the scraper holder 1, and the second spring bracket 17 is screwed to the mounting bracket. Both the first spring bracket 15 and the second spring bracket 17 are equipped with positioning pins 18. The spring 16 is compressed and limited between the first spring bracket 15 and the second spring bracket 17. Both ends of the spring 16 are positioned and sleeved on the corresponding positioning pins 18. The spring 16 can also... The springs are replaced with elastic elements such as tension springs and torsion springs. The positioning pins 18 position and constrain the two ends of the compression spring 16 to prevent it from becoming unstable and shifting during compression. This provides a stable and centered elastic clamping force, making the clamping force on the scraper frame 1 uniform and controllable. This significantly improves the stability of the adaptive swing of the scraper 2, ensuring that the clamping force is stable and reliable and the swing is smooth. The spring support 15 and the scraper frame 1, as well as the spring support 2 17 and the mounting bracket, are all fixed with screws, making the installation firm and reliable, and also convenient for subsequent disassembly and maintenance.

[0024] A heating film 19 is installed on the doctor blade holder 1, and a heating film pressure plate 20 is pressed and covered on the heating film 19. The heating film pressure plate 20 and the heating film 19 are fixedly connected to the doctor blade holder 1 by a second fixing screw 21. The end of the second fixing screw 21 passes through the heating film pressure plate 20 and the heating film 19 and connects to the doctor blade holder 1. The heating function of the heating film 19 can control the temperature of the doctor blade 2 and the ink accumulated nearby, effectively reducing the viscosity of high viscosity ink, improving the ink flow, preventing the ink from cooling and solidifying at the doctor blade 2, and ensuring smooth ink scraping without residue. It is especially suitable for low temperature or high solid content ink conditions, improving the process adaptability of the device and the ink scraping quality. The heating film pressure plate 20 ensures that the heating film 19 and the doctor blade holder 1 are tightly fitted, improving the heat conduction efficiency.

[0025] A heating sleeve 22 is installed inside the leveling roller 4. A radial gap is reserved between the heating sleeve 22 and the center hole of the leveling roller 4. The two ends of the heating sleeve 22 are supported on the mounting bracket by heat insulation rings 24. A heating rod 23 is installed inside the heating sleeve 22. The built-in heating system formed by the heating sleeve 22 and the heating rod 23 can heat the leveling roller 4 evenly and efficiently, so that the surface temperature of the heated roller is stable and the ink is prevented from cooling and solidifying on the roller surface. Heat insulation rings 24 are provided at the connection between the two ends of the heating sleeve 22 and the mounting bracket. The heat insulation rings 24 isolate the heating sleeve 22 from the mounting bracket, effectively blocking the conduction of heat to the bearing 3 and the mounting bracket, reducing heat loss and protecting the precision components such as the bearing 3 from high temperature. The radial gap provides space for the heating sleeve and the leveling roller to expand thermally when heated during operation, ensuring the reliability and safety of the equipment's thermal operation. It also ensures that the leveling roller 4 has no contact with the stationary heating sleeve 22 when rotating, avoiding direct contact between the two to prevent friction, wear or obstruction of rotation.

[0026] The heating sleeve 22 is fixed to the mounting bracket by positioning screws 30. The end of the heating sleeve 22 is provided with a positioning slot 31. The end of the positioning screw 30 extends through the mounting bracket into the positioning slot 31 to position the heating sleeve 22. The positioning screw 30 and the positioning slot 31 enable the heating sleeve 22 to be accurately fixed on the mounting bracket. The positioning screw 30 and the positioning slot 31 are in clearance fit, which ensures the axial and circumferential positioning of the heating sleeve 22 while allowing it to undergo slight displacement due to thermal expansion. This avoids the accumulation of thermal stress that may cause structural deformation or damage, improves the thermal stability of the system, and extends its service life.

[0027] Thermistors 25 are installed on both the doctor blade holder 1 and the heating sleeve 22. The design of the thermistors 25 can monitor the temperature of the doctor blade 2 area and the core temperature of the leveling roller 4 in real time, ensuring that the ink can always remain in a molten state. This is crucial for improving printing quality, process repeatability, and preventing malfunctions caused by abnormal temperature, thus improving the stability and safety of the equipment.

[0028] The mounting bracket includes support 26 and support 27. Support 26 includes upper support 28 and lower support 29. The scraper frame 1 is located between support 27 and upper support 28, and the heating sleeve 22 is located between support 27 and lower support 29. Support 26 is designed as a split upper and lower support. After the upper support 28 and lower support 29 are positioned by a positioning surface, they are fixedly connected by screws. This greatly facilitates the daily maintenance, replacement and debugging of scraper frame 1 and heating sleeve 22. During maintenance, only upper support 28 needs to be removed to take out scraper frame 1. There is no need to disassemble the entire equipment. The operation is simple and the assembly and maintenance process is greatly simplified, which effectively improves the efficiency and maintainability of the equipment.

[0029] An inkjet 3D printer includes the aforementioned leveling device that uses spring force to press the scraper.

[0030] This utility model is reasonably designed and highly practical. Through the design of the elastic clamping mechanism 1, it provides a continuous and stable elastic clamping force to the doctor blade 2, ensuring that the doctor blade 2 always adheres to the surface of the leveling roller 4 under the action of the elastic clamping force. At the same time, it allows the doctor blade holder 1 to swing adaptively around the axis of bearing 3, effectively absorbing the effects of equipment vibration, compensating for the effects of cylindricity error and thermal deformation of the leveling roller 4, thereby significantly improving the uniformity of ink scraping and printing quality. It solves the problems of incomplete ink scraping, friction noise and accelerated wear caused by traditional rigid locking structures, achieving a significant improvement in ink scraping effect, extending the service life of the doctor blade 2 and the leveling roller 4, and simplifying the structure, making installation and debugging convenient, and improving the stability and reliability of equipment operation.

[0031] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A leveling device that uses spring force to press a scraper, comprising a scraper holder, a scraper, and a mounting bracket; Its features are: Both ends of the scraper holder are rotatably mounted on the mounting bracket via bearings; The scraper is fixedly mounted on the scraper holder, and the blade of the scraper is in contact with the surface of the leveling roller; It also includes an elastic clamping mechanism, which is disposed between the scraper holder and the mounting bracket; The elastic clamping mechanism acts on the scraper frame to apply an elastic clamping force to the scraper and press it against the leveling roller; The scraper holder oscillates adaptively around the axis of the bearing under the action of the elastic clamping mechanism.

2. The leveling device for pressing a scraper with spring force according to claim 1, characterized in that: The scraper holder is provided with an installation slot, and a liner, the scraper and the scraper pressure plate are arranged sequentially from top to bottom in the installation slot. The liner, the scraper and the scraper pressure plate are fixedly installed in the installation slot by fixing screws.

3. A leveling device for pressing a scraper with spring force according to claim 2, characterized in that: The doctor blade holder is provided with a waste ink channel, and the side of the doctor blade holder is provided with an ink discharge port. The ink discharge port is connected to the waste ink channel. Several channel inlet holes are distributed along the length of the mounting groove. The channel inlet holes penetrate the mounting groove and are connected to the waste ink channel. A side gap channel is formed between the channel inlet holes and the mounting groove.

4. A leveling device for pressing a scraper with spring force according to claim 3, characterized in that: One end of the waste ink channel is a closed end, and the other end is an open end. The open end is located on the end face of the doctor blade holder, and a sealing plug is provided at the open end of the waste ink channel.

5. A leveling device for pressing a scraper with spring force according to claim 1, characterized in that: Both ends of the scraper holder are provided with the elastic pressing mechanism. The elastic pressing mechanism includes a first compression spring bracket, a compression spring, and a second compression spring bracket. The first compression spring bracket is fixedly connected to the scraper holder, and the second compression spring bracket is fixedly connected to the mounting bracket. Both the first and second compression spring brackets are provided with positioning pins. The compression spring is limited and compressed between the first and second compression spring brackets, and both ends of the compression spring are positioned and sleeved on the corresponding positioning pins.

6. A leveling device for pressing a scraper with spring force according to claim 1, characterized in that: A heating film is provided on the scraper holder, and a heating film pressure plate is pressed and covered on the heating film. The heating film pressure plate and the heating film are fixedly connected to the scraper holder by two fixing screws.

7. A leveling device for pressing a scraper with spring force according to claim 1, characterized in that: A heating sleeve is installed through the leveling roller. Both ends of the heating sleeve are supported on the mounting bracket by heat insulation rings. A heating rod is installed inside the heating sleeve.

8. A leveling device for pressing a scraper with spring force according to claim 7, characterized in that: The heating sleeve is fixed to the mounting bracket by positioning screws. The end of the heating sleeve is provided with a positioning slot. The end of the positioning screw extends through the mounting bracket into the positioning slot to position the heating sleeve. The scraper holder and the heating sleeve are both provided with thermistors.

9. A leveling device for pressing a scraper with spring force according to claim 7, characterized in that: The mounting bracket includes a first support and a second support. The first support includes an upper support and a lower support. The scraper is mounted between the second support and the upper support. The heating sleeve is mounted between the second support and the lower support.

10. An inkjet 3D printer, characterized in that: The leveling device includes the spring force used to press the scraper as described in any one of claims 1-9.

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