Material wiping device for 3D printing

Abstract

The utility model discloses a material wiping device for 3D printing, which comprises a base, the base is provided with a coarse wiping pad, a fine wiping assembly comprising a material pulling rod and a silica gel fine wiping block, a material grinding assembly comprising an elastic floating top block and a top plate, and the material wiping device is further provided with a push rod linked with a printing head. And finally, the top plate of the material grinding assembly is attached to the nozzle to grind the residual materials and prevent cooling and material overflowing, and the device achieves stepped automatic cleaning, thoroughly removes the residual materials, protects the nozzle, reduces the maintenance cost and improves the printing precision.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing, specifically to a material wiping device for 3D printing. Background Technology

[0002] 3D printing technology (especially fused deposition modeling (FDM) technology) has been widely used in industrial manufacturing, aerospace, medical rehabilitation, and consumer electronics due to its advantages of low cost, ease of operation, and wide material adaptability. During the operation of an FDM 3D printer, the print head nozzle needs to be continuously heated to the melting temperature (typically 180-260℃) to melt the filamentary printing material (such as PLA, ABS, PETG, etc.) and extrude it through the nozzle, building up the material along a preset trajectory.

[0003] However, the effectiveness of nozzle cleaning directly determines print quality and equipment stability. Currently, 3D printing equipment generally suffers from the following technical challenges in nozzle cleaning:

[0004] 1. Residual material causing printing defects: When printing ends or when changing materials, residual material in the nozzle cools and solidifies and adheres to the outer wall / outlet. If not cleaned, it will cause unstable extrusion, broken filaments, and clogging, resulting in poor printing accuracy. In severe cases, it is necessary to stop the machine and replace the nozzle, which increases costs.

[0005] 2. Existing cleaning methods are inefficient and ineffective: manual cleaning is time-consuming and labor-intensive and it is difficult to clean the gaps at the discharge port; simple mechanical wiping (such as rubber / metal scrapers) only removes loose material from the outer wall, and metal scrapers can easily scratch the nozzle;

[0006] 3. Defects in the automatic cleaning structure: Most automatic modules have limited functions (such as wasteful material discharge and residue removal), the fit between the wiping parts and the nozzles depends on rigid positioning, and printhead misalignment can easily lead to fluctuations in cleaning effect; moreover, there is no targeted waste collection, and the accumulation of residual material affects the accuracy of the equipment.

[0007] 4. Lack of cooling and anti-overflow design: When the nozzle cools down, the molten material inside is prone to overflow and solidify at the outlet, requiring additional cleaning, and may also cause insufficient material in the printing start layer.

[0008] In summary, existing solutions cannot simultaneously achieve thorough cleaning, high efficiency, stability, and low waste. There is an urgent need for specialized material wiping devices to address these issues and promote the automation and refinement of 3D printing equipment. Utility Model Content

[0009] This utility model aims to solve one of the technical problems existing in the prior art.

[0010] This application provides a wiping device for 3D printing, including a print head with a nozzle, and a base with a coarse wiping pad, a fine wiping component and an abrasive component on the top, wherein the coarse wiping pad, the fine wiping component and the abrasive component are used to coarsely wiping, finely wiping and polishing the nozzle in sequence.

[0011] The abrasive assembly includes a top block and an elastic floating limiter. The top block is movably mounted on the base via the elastic floating limiter, and its top surface is provided with a top plate for rubbing the print head.

[0012] The top plate has a positioning hole at the bottom, and the top block has a positioning boss for fitting and engaging with the positioning hole. The top plate and the top block are bonded and fixed together after the positioning hole and the positioning boss are engaged.

[0013] The elastic floating limit component includes a fixing bolt, a nut, a spring, and a limit groove. The limit groove is formed on the bottom surface of the top of the base. The upper end of the fixing bolt is fixed to the top block, and the lower end moves into the limit groove and connects with the nut. The nut slides in the limit groove. The spring is used to provide upward pressure on the top block.

[0014] The precision erasing assembly includes a rear seat, a feed unit, and a precision erasing block. The feed unit is movably mounted on the rear seat, and the precision erasing block is mounted on the outer end of the feed unit via a bracket. The feed unit is used to drive the print head. The movement of the print head controls the movement of the feed unit, causing the precision erasing block to contact the nozzle and move relative to it.

[0015] The base is equipped with a positioning block, and the bottom of the rear seat is fixed to the base by bolts. The positioning slot is inserted into the positioning protrusion for positioning.

[0016] The feeding unit includes a push rod, a feeding rod, and a push rod spring. The rear seat is fixed on the base. The feeding rod is horizontally inserted through the lower part of the rear seat. The push rod is hinged to the upper part of the rear seat via an optical shaft. The lower end of the push rod is in close contact with the rear end of the feeding rod, and the upper end is used for contact transmission with the print head. A fine-erasing block is installed on the outer end of the feeding rod. The push rod spring is used to apply a backward thrust to the inner end of the feeding rod.

[0017] Both the upper and lower ends of the pull rod are bent toward the fine rubbing block. The front end of the pull rod is bent to form a waste blocking surface, and the rear end is bent with the two side walls abutting against the lower end of the pull rod and the push rod spring, respectively.

[0018] A spring mounting hole is provided on the inner side of the front wall of the rear seat. The push rod spring is embedded in the spring mounting hole. One end of the push rod spring abuts against the inner wall of the rear seat, and the other end abuts against the rear end of the pull rod.

[0019] The cleaning block is made of silicone and has an adapter slot on the top for scraping the nozzle.

[0020] The coarse wiping pad is made of silicone, with several crisscrossing grooves on the top, and is fixed to the base with double-sided adhesive. A wiping device for 3D printing includes:

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. Through the structure of "coarse wiping pad + silicone fine wiping block with matching seam + abrasive assembly with elastic floating limiter (spring, sliding nut)", the coarse wiping pad first peels off the floating material on the outer wall of the nozzle, the fine wiping block wraps and scrapes the fine residue at the outlet with the matching seam, and the abrasive assembly spring presses the top plate tightly against the nozzle and rubs the hard residue when it cools down. The three work together in sequence to achieve a thorough cleaning of the nozzle outer wall, the gap at the outlet and the solidified hard residue. At the same time, the top plate presses against the outlet to prevent material overflow when it cools down, avoiding problems such as filament breakage and nozzle blockage caused by residual material, and improving the accuracy and pass rate of printed parts.

[0023] 2. Through the mechanical linkage structure of "print head-push rod-pull rod" + elastic floating limit component of abrasive component + rear seat positioning groove and base positioning block structure, the print head impacts the push rod to drive the pull rod to move the fine cleaning block. The elastic limit component allows the top plate to adaptively fit the nozzle deviation position. The positioning groove block ensures that the rear seat and the fine cleaning block are accurately aligned. The three have no additional power to cooperate, realize the automatic triggering of the cleaning action, solve the problem of "not being able to clean and uneven cleaning force" of rigid positioning, and improve the adaptability of the device to the slight deviation of the print head and the cleaning stability.

[0024] 3. Through the structure of "high temperature resistant silicone material wiping parts (coarse wiping pad, fine wiping block) + double-sided adhesive to fix the coarse wiping pad + detachable fine wiping block + pull rod waste blocking surface", the silicone parts have flexible contact to prevent nozzle scratches, the double-sided adhesive / detachable design facilitates the replacement of vulnerable parts, and the waste blocking surface collects filamentous residue. The three functions work together to achieve low wear of the wiping parts, convenient maintenance and operation, reduce the situation of residue falling into the equipment, and reduce the frequency of equipment disassembly and cleaning and the cost of consumable waste.

[0025] 4. Through the structure of "silicone elastic rubbing component + top plate rough surface adapted to the grinding range + spring mounting hole + horizontally inserted pull rod + base-rear seat bolt fixation", the silicone component flexibly rubs and protects the nozzle, the top plate rough surface only grinds residual material without damaging the nozzle body, the spring mounting hole limits the spring to prevent the pull rod from getting stuck, and the insertion and bolt fixation prevent the device from swinging. The multi-structure cooperation achieves damage protection for the nozzle and ensures the overall operational stability of the equipment, extending the service life of the nozzle and the equipment. Attached Figure Description

[0026] Figure 1 This is a perspective view of the material wiping device used for 3D printing in an embodiment of this application;

[0027] Figure 2 This is a perspective view of a material wiping device for 3D printing in an embodiment of this application (without print head and nozzle).

[0028] Figure 3 This is a perspective view of the abrasive assembly in an embodiment of this application;

[0029] Figure 4 This is a perspective view of the base in an embodiment of this application;

[0030] Figure 5 This is a perspective view of the base in an embodiment of this application;

[0031] Figure 6 This is a perspective view of the precision cleaning component in an embodiment of this application;

[0032] Figure 7 This is a perspective view of the rear seat in an embodiment of this application;

[0033] Figure 8 This is a perspective view of the rear seat in an embodiment of this application;

[0034] Figure 9 This is a perspective view of the material pulling unit in the embodiments of this application;

[0035] Figure 10 This is a perspective view of the coarse rubbing pad in an embodiment of this application.

[0036] Figure Labels

[0037] 1-Print head, 2-Coarse wiping pad, 3-Fine wiping assembly, 31-Rear seat, 32-Pulling unit, 321-Push rod, 322-Pulling rod, 323-Push rod spring, 324-Waste blocking surface, 33-Fine wiping block, 4-Abrasive assembly, 41-Top block, 42-Elastic floating limiter, 421-Fixing bolt, 422-Nut, 423-Spring, 424-Limiting groove, 43-Top plate, 44-Positioning hole, 5-Base, 6-Positioning block, 7-Positioning groove, 8-Adaptor seam, 9-Scraping groove, 10-Spring mounting hole. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0039] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0040] The material wiping device for 3D printing provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0041] Example 1:

[0042] This application provides a wiping device for 3D printing, including a print head 1 with a nozzle, and a base 5 with a coarse wiping pad 2, a fine wiping component 3 and an abrasive component 4 on the top. The coarse wiping pad 2, the fine wiping component 3 and the abrasive component 4 are used to coarsely wipe, finely wipe and polish the nozzle in sequence.

[0043] In this embodiment of the application, the abrasive assembly 4 includes a top block 41 and an elastic floating limit member 42. The top block 41 is movably mounted on the base 5 through the elastic floating limit member 42, and its top surface is provided with a top plate 43 for rubbing the print head 1.

[0044] like Figures 1 to 2 As shown, due to the above structure, on the one hand, the sequential cleaning layout of "coarse wiping pad 2 - fine wiping component 3 - abrasive component 4" constructs a stepped nozzle cleaning process of "preliminary material removal - fine cleaning - residual material grinding", which can gradually remove residual material from the nozzle surface and the outlet, avoiding the problem of residual material caused by a single cleaning method. On the other hand, the top block 41 is movably installed through the elastic floating limiter 42, which can use the elastic force to keep the top plate 43 in close contact with the nozzle outlet. Even if there is a slight positional deviation of the nozzle, it can achieve adaptive contact through elastic floating, ensuring stable contact between the top plate 43 and the nozzle during the grinding process, effectively grinding away residual material on the nozzle surface, and preventing material from overflowing from the outlet when the nozzle cools down at high temperature, thus providing a basic guarantee for the accuracy of subsequent printing.

[0045] Example 2:

[0046] In this embodiment, in addition to the structural features of the aforementioned embodiments, the top plate 43 has a positioning hole 44 at its bottom, and the top block 41 has a positioning boss for fitting and engaging with the positioning hole 44. The top plate 43 and the top block 41 are bonded and fixed together after the positioning hole 44 and the positioning boss are engaged.

[0047] In this embodiment of the application, the elastic floating limiting member 42 includes a fixing bolt 421, a nut 422, a spring 423, and a limiting groove 424. The limiting groove 424 is formed on the top bottom surface of the base 5. The upper end of the fixing bolt is fixedly connected to the top block 41, and the lower end is movably inserted into the limiting groove 424 and connected to the nut 422. The nut 422 and the limiting groove 424 are slidably engaged. The spring 423 is used to provide upward pressure on the top block 41.

[0048] like Figures 3 to 5 As shown, due to the above structure, firstly, the precise positioning of the top plate 43 and the top block 41 can be quickly achieved through the matching engagement of the positioning hole 44 and the positioning boss, avoiding positional displacement during subsequent bonding and fixing, ensuring that the rough surface of the top plate 43 can accurately correspond to the nozzle outlet, and improving the targeting of grinding; secondly, in the elastic floating limit component 42, the sliding cooperation between the limit groove 424 and the nut 422 not only limits the vertical movement range of the top block 41, but also prevents the nut 422 from coming out of the limit groove 424 when the nozzle presses down on the top block 41 through the design of "the hole depth is greater than the height of the nut 422", ensuring the stability of the structure operation; at the same time, the upward pressure applied by the spring 423 to the top block 41 can continuously maintain the fit between the top plate 43 and the nozzle, and can drive the top block 41 to automatically reset after grinding, without the need for additional power drive, simplifying the structure and improving the ease of operation.

[0049] Example 3:

[0050] In this embodiment, in addition to the structural features of the aforementioned embodiments, the fine erasing assembly 3 includes a rear seat 31, a material pulling unit 32, and a fine erasing block 33. The material pulling unit 32 is movably mounted on the rear seat 31, and the fine erasing block 33 is mounted on the outer end of the material pulling unit 32 via a bracket. The material pulling unit 32 is used to drive and cooperate with the print head 1. The movement of the print head 1 controls the movement of the material pulling unit 32, so that the fine erasing block 33 contacts the nozzle and moves relative to it.

[0051] In this embodiment of the application, the base 5 is provided with a positioning block 6, and the bottom of the rear seat 31 is fixed to the base 5 by bolts and positioned by the positioning slot 7 and the positioning block 6.

[0052] like Figures 5 to 9As shown, due to the aforementioned structure, firstly, the material pulling unit 32 achieves transmission control through the movement of the print head 1, eliminating the need for additional drive components such as motors and cylinders. This greatly simplifies the overall structure of the precision erasing assembly 3, reducing equipment costs and the risk of failure. Simultaneously, the movement of the print head 1 itself is linked with the action of the material pulling unit 32, enabling precise control of the contact timing and contact force between the precision erasing block 33 and the nozzle. Secondly, the insertion and cooperation between the positioning block 6 of the base 5 and the positioning groove 7 of the rear seat 31 allows for quick installation and positioning of the rear seat 31, preventing positional deviations during bolt fixing of the rear seat 31. This ensures that the precision erasing block 33 can accurately align with the nozzle's movement trajectory, preventing incomplete cleaning due to misalignment of the precision erasing block 33. Furthermore, the rear seat 31 is fixed to the base 5 with bolts, further enhancing the structural stability of the precision erasing assembly 3 during operation and preventing the cleaning effect from being affected by the shaking of the rear seat 31 during erasing.

[0053] Example 4:

[0054] In this embodiment, in addition to the structural features of the aforementioned embodiments, the material pulling unit 32 includes a push rod 321, a material pulling rod 322, and a push rod spring 323. The rear seat 31 is fixed on the base 5. The material pulling rod 322 is horizontally inserted through the lower part of the rear seat 31. The push rod 321 is hinged to the upper part of the rear seat 31 via an optical shaft. The lower end of the push rod 321 is in close contact with the rear end of the material pulling rod 322, and the upper end is used for contact transmission with the print head 1. A fine rubbing block 33 is installed on the outer end of the material pulling rod 322. The push rod spring 323 is used to apply a backward thrust to the inner end of the material pulling rod 322.

[0055] In this embodiment of the application, the upper and lower ends of the pull rod 322 are bent toward the fine rubbing block 33. The front end of the pull rod 322 is bent to form a waste blocking surface 324, and the rear end is bent with the side walls abutting against the lower end of the pull rod 322 and the push rod spring 323, respectively.

[0056] like Figures 6 to 9As shown, due to the above-mentioned structure, firstly, the push rod 321 is hinged to the optical axis, and its lower end is tightly fitted to the rear end of the pull rod 322. When the print head 1 strikes the upper end of the push rod 321, it can efficiently drive the pull rod 322 forward through the lever principle, realizing the rapid contact between the fine rubbing block 33 and the nozzle. The transmission structure is simple and responsive, avoiding power transmission delay. Secondly, the waste blocking surface 324 formed by the bending of the front end of the pull rod 322 can prevent filamentous waste from falling forward during the coarse rubbing process, preventing waste from scattering into the equipment and becoming difficult to handle. The cleaning process effectively reduces the difficulty of waste disposal. Third, the rear end of the pull rod 322 is bent and abuts against the push rod spring 323, which increases the contact area between the push rod spring 323 and the pull rod 322. This allows the push force of the push rod spring 323 to act more evenly on the pull rod 322, ensuring smooth movement when the pull rod 322 resets and preventing the pull rod 322 from jamming due to uneven force. At the same time, the pull rod 322 is horizontally inserted under the rear seat 31, which can limit its up and down swing and ensure that the fine wiping block 33 moves along a horizontal trajectory during coarse wiping, improving the consistency of cleaning.

[0057] Example 5:

[0058] In this embodiment, in addition to the structural features of the aforementioned embodiments, a spring mounting hole 10 is provided on the inner side of the front wall of the rear seat 31, and a push rod spring 323 is embedded in the spring mounting hole 10. One end of the push rod spring 323 abuts against the inner wall of the rear seat 31, and the other end abuts against the rear end of the pull rod 322.

[0059] like Figure 9 As shown, due to the above-mentioned structure, the spring mounting hole 10 on the inner side of the front wall of the rear seat 31 can accurately position and limit the push rod spring 323, preventing the push rod spring 323 from shifting laterally or falling off during operation. This ensures that the push rod spring 323 always applies force along the forward and backward movement direction of the pull rod 322, guaranteeing the stability and reliability of the pull rod 322's reset. At the same time, the embedded design of the mounting hole can hide the push rod spring 323 inside the rear seat 31, reducing the contact friction between the push rod spring 323 and external components, reducing wear on the push rod spring 323, and extending its service life. In addition, the structure in which one end of the push rod spring 323 abuts against the inner wall of the rear seat 31 and the other end abuts against the rear end of the pull rod 322 allows the elastic force of the push rod spring 323 to be transmitted more directly to the pull rod 322, avoiding elastic force loss and further improving the reset response speed of the pull rod 322.

[0060] Example 6:

[0061] In this embodiment, in addition to the structural features of the aforementioned embodiments, the fine wiping block 33 is made of silicone and has an adapter slit 8 on its top for wiping the nozzle.

[0062] like Figure 9As shown, due to the above-mentioned structure, the fine erasing block 33 is made of silicone material. Its soft and high-temperature resistant properties ensure that it will not scratch the nozzle surface when in contact with the nozzle (avoiding nozzle damage that affects printing accuracy), and can also adapt to the high-temperature environment of the nozzle (preventing material deformation due to high temperature). At the same time, the adapter slot 8 opened on the top of the fine erasing block 33 can precisely fit the shape of the nozzle. When the nozzle moves back and forth in the slot, the two side walls of the adapter slot 8 can form a wrapping scraping of the residual material on the nozzle surface. Compared with the flat erasing block, it can more thoroughly remove the small residual material from the nozzle outlet and the outer periphery, further improving the fine erasing effect and avoiding printing filament breakage and nozzle clogging caused by residual material.

[0063] Example 7:

[0064] In this embodiment, in addition to the structural features of the aforementioned embodiments, the coarse wiping pad 2 is made of silicone, has several crisscrossing scraping grooves 9 on the top, and is fixed to the base 5 by double-sided adhesive.

[0065] like Figure 10 As shown, due to the above-mentioned structure, the coarse wiping pad 2 is made of silicone, whose good elasticity and wear resistance can quickly remove most of the blocky and filamentous residues on the nozzle surface during the coarse wiping process, while avoiding hard damage to the nozzle. The several crisscrossing scraping grooves 9 set on the top can serve as a waste material collection space, which can temporarily store the residue scraped off during the coarse wiping process and prevent waste from accumulating on the surface of the coarse wiping pad 2, affecting the cleanliness of subsequent wiping. In addition, the coarse wiping pad 2 is fixed to the base 5 with double-sided adhesive. Compared with bolt fixing, it not only simplifies the installation process, but also facilitates the subsequent disassembly and replacement of the coarse wiping pad 2 (when the pad is severely worn, it can be quickly peeled off and replaced with a new pad), reducing equipment maintenance costs and operating difficulty. At the same time, the fixing effect of double-sided adhesive can ensure that the pad will not shift during the coarse wiping process, ensuring the stability of the coarse wiping action.

[0066] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0067] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A wiping device for 3D printing comprising a print head with a nozzle, characterized in that, The base is provided with a rough pad, a fine pad assembly and an abrasive assembly on the top, which are used for rough wiping, fine wiping and polishing of the nozzle in sequence.

2. The wipe device for 3D printing according to claim 1, characterized in that, The abrasive assembly comprises a top block and an elastic floating limiting piece, the top block is movably installed on the base through the elastic floating limiting piece, and the top surface of the top block is provided with a top plate for rubbing the print head.

3. The wiper device for 3D printing according to claim 2, characterized in that, The bottom of the top plate is provided with a positioning hole, and the top block is provided with a positioning boss adapted to be clamped with the positioning hole, and the top plate and the top block are matched through the positioning hole and the positioning boss.

4. The wiper device for 3D printing according to claim 2, wherein, The elastic floating limiting piece comprises a fixing bolt, a nut, a spring and a limiting groove, the limiting groove is arranged on the top surface of the base, the upper end of the fixing bolt is fixedly connected with the top block, the lower end of the fixing bolt is movably inserted into the limiting groove and connected with the nut, the nut is slidably matched with the limiting groove, and the spring is used for providing upward pressure to the top block.

5. The wipe device for 3D printing according to claim 1, wherein, The fine pad assembly comprises a rear seat, a material pulling unit and a fine pad, the material pulling unit is movably installed on the rear seat, the fine pad is installed on the outer end of the material pulling unit through a support, the material pulling unit is used for transmission cooperation with the print head, the movement of the print head controls the action of the material pulling unit, so that the fine pad is in contact with the nozzle and moves relatively.

6. The wipe device for 3D printing according to claim 5, characterized in that, The material pulling unit comprises a push rod, a material pulling rod and a push rod spring, the rear seat is fixedly arranged on the base, the material pulling rod is horizontally arranged in the lower part of the rear seat, the push rod is hingedly installed on the upper part of the rear seat, the lower end of the push rod is tightly connected with the rear end of the material pulling rod, and the upper end of the push rod is used for transmission cooperation with the print head, the fine pad is installed on the outer end of the material pulling rod, and the push rod spring is used for applying a backward thrust to the inner end of the material pulling rod.

7. The wipe device for 3D printing according to claim 6, characterized in that, The upper end and the lower end of the material pulling rod are bent towards the fine pad, the front end of the material pulling rod is bent to form a waste blocking surface, and the rear end is bent and the two side walls are respectively abutted with the lower end of the material pulling rod and the push rod spring.

8. The wipe device for 3D printing according to claim 6, characterized in that, The spring mounting hole is arranged in the inner side of the front wall of the rear seat, the push rod spring is embedded in the spring mounting hole, one end of the push rod spring is abutted with the inner wall of the rear seat, and the other end of the push rod spring is abutted with the rear end of the material pulling rod.

9. The wipe for 3D printing according to claim 5, wherein, The fine pad is made of silica gel and is provided with an adaptive slot on the top for scraping the nozzle.

10. The wipe device for 3D printing according to claim 1, wherein, The rough pad is made of silica gel and is provided with a plurality of longitudinal and transverse intersecting scraping grooves on the top, and is fixed on the base by double-sided adhesive tape.

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