3D printing feeder rewinding and slipping preventing device based on elastic pressure self-adaption

Abstract

The invention discloses a 3D printing feeder rewinding and slipping preventing device based on elastic pressure self-adaption, and belongs to the technical field of fused deposition modeling (FDM) 3D printing equipment. The device mainly comprises a fixed seat, a pressure applying friction assembly, a guide mechanism, an elastic pressure applying mechanism, a locking and limiting mechanism and a wear-resisting structure. The fixed seat is installed on the feeder upper cover, and the pressure applying friction assembly is movably connected with the fixed seat through the guide mechanism and can vertically move under the action of pressing force which is provided by the elastic pressure applying mechanism and faces the edge of the material disc. The core lies in that the pressure applying friction assembly can only move in the direction perpendicular to the end face of the material disc through the guide mechanism, rewinding slipping and jumping of the material disc in the feeding and discharging process are effectively restrained, the structure is compact, stable self-adaptive pressure can be provided, the feeding reliability is remarkably improved, slipping and jumping of the material disc are prevented, and maintenance is convenient.

Description

Technical Field

[0001] This invention relates to the field of 3D printing equipment technology, and in particular to a 3D printing feeder anti-rewinding and slippage device based on elastic pressure adaptive. This device is particularly suitable for solving the rewinding and slippage problem caused by the weight reduction or size difference of the feed tray in FDM multicolor printing. Its core includes a fixed base, a pressure friction component, a guide mechanism, an elastic pressure mechanism, and a locking and limiting mechanism. Background Technology

[0002] In fused deposition modeling (FDM) multicolor 3D printing, the feeder needs to frequently switch between different colors of filament, a process often accompanied by filament rewinding (unwinding). In existing technologies, a common solution is to use a rigid block or baffle at a fixed height above the filament tray for limiting movement, suppressing tray bounce during rewinding through physical contact. However, this type of rigid limiting solution has significant adaptability bottlenecks when dealing with different tray sizes and dynamically changing working conditions, specifically in the following two aspects: 1. Poor geometric adaptability: It cannot accommodate tray size tolerances. The effective clamping height of the rigid block is fixed and cannot be adjusted, making it difficult to adapt to the diameter tolerances of different brands or batches of trays (e.g., a standard tray diameter is 200 mm, while some third-party trays may have diameters reduced to 195 mm). When the tray diameter is smaller than the preset effective range of the block, a gap will exist between the block and the tray end face, preventing effective contact. During the rewinding process, the material tray jumps due to the loss of axial constraint, causing the effective power transmission between the drive wheel and the material tray to fail, which in turn leads to the failure of material unloading.

[0003] 2. Dynamic Pressure Failure: The rigid stop provides static, constant pressure and cannot adapt to changes in filament weight. When the filament tray is fully loaded (heavy weight, e.g., over 800 grams), its own weight generates significant positive pressure, and the system typically functions normally. However, as printing time increases and the remaining filament in the tray becomes very low (significantly reduced weight, e.g., to around 50 grams), the tray's weight decreases drastically. The rigid stop cannot provide additional pressure to compensate, resulting in insufficient positive pressure between the tray and the drive roller, and a significant decrease in effective friction. At this point, the drive roller is prone to slipping and spinning (manifesting as the tray bouncing or not rotating), failing to effectively rewind the filament, ultimately leading to the failure of the unwinding action.

[0004] The aforementioned problems reflect the limitations of existing rigid limiting solutions in terms of versatility (adaptability) and dynamic reliability. Therefore, there is an urgent need in the field for a device capable of adaptively adjusting the clamping force to fundamentally solve the problem of rewinding slippage caused by differences in material tray size and weight. Summary of the Invention

[0005] This invention aims to overcome the shortcomings of existing rigid stop limiting schemes, such as poor geometric adaptability and dynamic pressure failure, and provides a 3D printing feeder anti-rewinding and slippage device based on elastic pressure self-adaptation. Specifically, the technical problem to be solved is: how to enable the anti-rewinding device to effectively adapt to the manufacturing tolerance of the feed tray diameter, and to adaptively and continuously provide stable and sufficient clamping force during the dynamic change of feed tray weight from full to empty, thereby fundamentally avoiding rewinding and slippage failure caused by dimensional differences and weight changes.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a 3D printing feeder anti-rewinding and slippage device based on elastic pressure adaptive, comprising a fixed base, a pressure friction assembly, a guiding mechanism, an elastic pressure mechanism, and a locking and limiting mechanism. Fixed base: Serves as a mounting base for mounting the entire device onto the feeder. Pressure friction assembly: Activatedly connected to the fixed base, serves as a functional actuator; its working surface directly contacts the end face of the feed tray, transmitting torque through friction and suppressing its vibration.

[0007] Wear-resistant structure: The pressure friction assembly is provided with a wear-resistant structure, which can be implemented in one of the following two ways. a. Integrated wear-resistant structure: The pressure-applying friction component itself is made of wear-resistant material; b. Split-type wear-resistant structure: The wear-resistant structure is an independent wear-resistant component, which is fixed to the pressure friction assembly by welding, bonding, threaded connection, snap-fit ​​connection or interference fit.

[0008] Guide mechanism: disposed between the fixed base and the pressure friction assembly, used to restrict the degree of freedom of movement of the pressure friction assembly, ensuring that it can only move in a direction perpendicular to the end face of the material tray, so as to ensure the linearity of pressure transmission and prevent skew and jamming.

[0009] Elastic pressure mechanism: disposed between the fixed base and the pressure friction assembly, used to provide continuous elastic pressure toward the end face of the material tray to the pressure friction assembly. This is the core of the adaptive function. Its elasticity is used to provide initial clamping force and compensate for pressure loss caused by changes in the diameter or weight of the material tray.

[0010] Locking and limiting mechanism: used to limit the maximum travel of the pressure friction component relative to the fixed base, serving as a travel limit and safety protection function to prevent it from leaving the working position.

[0011] This solution utilizes the coordinated efforts of various mechanisms to form a dynamic, pressure-adaptive system. When the diameter of the feed pan changes or its weight decreases, the system can dynamically maintain effective clamping force, ensuring reliable power transmission.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. Excellent geometric adaptability: The elastic pressure mechanism can effectively compensate for the diameter tolerance of the tray (such as 200mm and 195mm trays), ensuring that the pressure friction component can effectively contact the end face of trays of different specifications, eliminating functional failures caused by size differences and improving compatibility with non-standard trays.

[0013] 2. Dynamic pressure compensation capability: The elastic mechanism can continuously provide positive pressure when the weight of the tray changes dynamically (from about 800 grams when the tray is full to about 50 grams when the tray is empty), which effectively solves the problem of insufficient friction caused by the reduction of the tray's own weight, and fundamentally avoids the rewinding and slippage of the lightweight tray.

[0014] 3. High reliability and ease of maintenance: The durability of the pressure friction components is significantly improved through optional wear-resistant structures (integral or split). In particular, the split design allows for independent replacement of wear-resistant parts after wear, enabling rapid maintenance of critical components and greatly reducing long-term maintenance costs and time.

[0015] 4. Modular integration advantages: It integrates dynamic clamping, precise guidance, stroke limit and optional wear-resistant structure into one compact structure with synergistic functions, which significantly improves the reliability and stability of material ejection during multi-color printing, thereby increasing the printing success rate. Attached Figure Description

[0016] Figure 1 This is an exploded view of the entire invention, A1. Figure 2 This is a schematic diagram of the overall structure of A1 of the present invention; Figure 3 This is an overall top view of the present invention, A1. Figure 4 A1 of the present invention Figure 3 AA stepped sectional view in the middle; Figure 5 This is a top view of the fixing seat of A1 according to the present invention; Figure 6 A1 of the present invention Figure 5 BB stepped sectional view in the middle; Figure 7 This is a top view of the A1 pressure friction assembly of the present invention; Figure 8 A1 of the present invention Figure 7 CC-step sectional view in the middle; Figure 9 This is an exploded view of the entire structure, B1, of the present invention; Figure 10 This is an exploded top view of the B1 component of the present invention; Figure 11B1 of the present invention Figure 10 Exploded staircase section view of EE in the middle; Figure 12 This is a schematic diagram of the overall structure of B1 of the present invention; Figure 13 This is a top view of the entire structure of the present invention, B1. Figure 14 B1 of the present invention Figure 13 FF stepped section view; Figure 15 This is an exploded view of the overall C1 structure of the present invention; Figure 16 This is a schematic diagram of the overall C1 of the present invention; Figure 17 This is a top view of the C1 component of the present invention; Figure 18 C1 of the present invention Figure 17 GG stepped sectional view in the middle; Figure 19 This is an exploded view of the C2 pressure friction assembly of the present invention; Figure 20 This is a schematic diagram of the C2 pressure friction assembly of the present invention; Figure 21 This is an exploded view of the C3 pressure friction assembly of the present invention; Figure 22 This is a schematic diagram of the C3 pressure friction assembly of the present invention; Figure 23 This is an exploded view of the entire invention, D1. Figure 24 This is a schematic diagram of the overall structure of the present invention, D1. Figure 25 This is the overall top view of the present invention, D1. Figure 26 D1 of the present invention Figure 25 HH stepped sectional view in the middle; Figure 27 This is the overall exploded view of the present invention, D2. Figure 28 This is a schematic diagram of the overall structure of the present invention, D2. Figure 29 This is the overall top view of the present invention, D2. Figure 30 D2 of the present invention Figure 29 JJ section view; Figure 31 This is an exploded view of the E1 component of the present invention; Figure 32 This is a schematic diagram of the E1 component of the present invention; Figure 33 This is a top view of the E1 component of the present invention; Figure 34 E1 of the present invention Figure 33 KK section view in the middle; Figure 35 This is a schematic diagram of the E1 locking and limiting mechanism (5) of the present invention; Figure 36 This is a schematic diagram of the reverse side of the E1 locking and limiting mechanism (5) of the present invention; Figure 37 This is a schematic diagram of the E1 short-stroke locking and limiting mechanism (501) of the present invention; Figure 38 This is a schematic diagram of the reverse side of the E1 short-stroke locking and limiting mechanism (501) of the present invention; Figure 39 This is a schematic diagram of the E1 replacement (501) of the present invention; Figure 40 Replace the overall top view of E1 (501) of the present invention; Figure 41 E1 of the present invention Figure 40 LL section view; Figure 42 This is an exploded view of the E2 module of the present invention. Figure 43 This is a schematic diagram of the E2 component of the present invention; Figure 44 This is a top view of the E2 module of the present invention; Figure 45 E2 of the present invention Figure 44 MM section view in the middle; Figure 46 This is a schematic diagram of the E2 locking and limiting mechanism (5) of the present invention; Figure 47 This is a schematic diagram of the reverse side of the E2 locking and limiting mechanism (5) of the present invention; Figure 48 This is an exploded view of the E3 module of the present invention; Figure 49 This is a schematic diagram of the E3 component of the present invention; Figure 50 This is a top view of the E3 module of the present invention; Figure 51 E3 of the present invention Figure 50 NN cross-sectional view in the middle; Figure 52 This is a schematic diagram of the E3 locking and limiting mechanism (5) of the present invention; Figure 53 This is a schematic diagram of the reverse side of the E3 locking and limiting mechanism (5) of the present invention; Figure 54 This is an exploded view of the E4 module of the present invention; Figure 55This is a schematic diagram of the E4 component of the present invention; Figure 56 This is a top view of the E4 module of the present invention; Figure 57 E4 of the present invention Figure 56 PP sectional view; Figure 58 This is a schematic diagram of the E4 locking and limiting mechanism (5) of the present invention; Figure 59 This is a schematic diagram of the reverse side of the E4 locking and limiting mechanism (5) of the present invention; Figure 60 This is an exploded view of the E5 component of the present invention; Figure 61 This is a schematic diagram of the E5 component of the present invention; Figure 62 This is a top view of the E5 component of the present invention; Figure 63 E5 of the present invention Figure 62 RR section view in the middle; Figure 64 This is an exploded view of the F1 module of the present invention; Figure 65 This is a schematic diagram of the F1 component of the present invention; Figure 66 This is a top view of the F1 component of the present invention; Figure 67 F1 of the present invention Figure 66 AA-AA stepped sectional view in the middle; Figure 68 This is an exploded view of the F2 component of the present invention. Figure 69 This is a schematic diagram of the F2 component of the present invention; Figure 70 This is a top view of the F2 component of the present invention; Figure 71 F2 of the present invention Figure 70 BB-BB stepped sectional view in the middle; Figure 72 This is a schematic diagram showing the core component cooperation relationship of the F2 embodiment of the present invention; Figure 73 For the present invention Figure 72 The right view; Figure 74 This is an exploded view of the F3 component of the present invention. Figure 75 This is a schematic diagram of the F3 component of the present invention; Figure 76 This is a top view of the F3 component of the present invention; Figure 77 F3 of the present invention Figure 76CC-CC stepped sectional view in the middle; Figure 78 This is a schematic diagram showing the cooperation relationship of the core components in embodiment F3 of the present invention; Figure 79 For the present invention Figure 78 The right view; Figure 80 This is a schematic diagram of the F3 locking and limiting mechanism (5) of the present invention; Figure 81 This is a schematic diagram of the reverse side of the F3 locking and limiting mechanism (5) of the present invention; Figure 82 This is a schematic diagram of the F3 short-stroke locking and limiting mechanism (501) of the present invention; Figure 83 This is a schematic diagram of the reverse side of the F3 short-stroke locking and limiting mechanism (501) of the present invention; Figure 84 This is a schematic diagram of the F3 replacement (501) of the present invention; Figure 85 Replace the right view (501) of F3 in this invention; Figure 86 This is a schematic diagram of the overall structure of the feeder of the present invention; Figure 87 This is a schematic diagram of the internal structure of the feeder of the present invention; Figure 88 This is a front view of a schematic diagram of the internal structure of the feeder of the present invention; Figure 89 For the present invention Figure 88 A magnified view of a portion of DD; In the diagram: 1. Fixed base; 4. Pressure friction assembly; 2. Guide mechanism; 3. Elastic pressure mechanism; 5. Locking and limiting mechanism; 501. Short-stroke locking and limiting mechanism; 41. Replaceable friction assembly; 42. Replaceable friction assembly fixing screw; 6. Feeder body; 61. Feeder top cover; 62. Material tray; 63. Consumable wire; 64. Feeder top cover positioning post; 65. Front of material tray drive roller; 66. Rear of material tray drive roller; 67. Inlet / outlet; 11. Fixed base fixing part; 12. Positioning fixing hole; 21. Guide hole; 22. Guide mechanism mounting part; 23. Guide mechanism adhesive fixing part; 24. Circumferential wear-resistant rod, 25 wear-resistant rod mounting hole, 26 venting and ejection hole, 2152 guide and limit composite hole, 31 elastic pressure mechanism mounting part, 32 screw avoidance mechanism, 51 locking mating part, 52 locking mechanism through hole, 53 limit magnet seat, 54 limit magnet moving block, 55 moving block mounting groove, 56 contoured limit clearance, 57 circumferential wear-resistant rod clearance, 58 limit contouring recess, 59 limit contouring protrusion, 44 replaceable friction component fixing part, 43 replaceable friction component fixing threaded hole, 45 replaceable friction component locking buckle, 46 adhesive fixing part. Detailed Implementation

[0017] The embodiments A1 to F3 of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are only used to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0018] Implementation method A1 (spring-driven mechanical type) As attached Figures 86 to 89 As shown, and in combination Figures 1 to 8 This embodiment includes: a fixed base 1, a pressure friction assembly 4, an elastic pressure mechanism 3 (spring), and a locking and limiting mechanism 5 (limiting screw).

[0019] The fixed base 1 is initially positioned by engaging with the feeder cover positioning post 64 of the feeder cover 61 through its positioning fixing hole 12. The positioning fixing hole 12 has a through hole in the middle for the self-tapping screw of the fixed base fixing part 11 to pass through, using the self-tapping screw to finally fasten the fixed base 1 to the feeder cover 61. The four guide posts of the guide mechanism 2 are fixed to the fixed base 1. The pressure friction assembly 4 is precisely fitted onto the guide posts through its guide hole 21, ensuring that it can slide smoothly in the vertical direction without rotation or offset. The elastic pressure mechanism 3 consists of two helical springs, housed in the corresponding annular elastic pressure mechanism mounting parts 31 on the fixed base 1 and the pressure friction assembly 4. The screw avoidance mechanism 32 is a recessed groove located in the elastic pressure mechanism mounting part 31 of the pressure friction assembly 4, used to avoid the head of the screw in the fixed base fixing part 11, preventing it from interfering with the compression movement of the spring. The locking and limiting mechanism 5 is a limiting screw that passes through the locking mechanism through hole 52 on the pressure friction assembly 4 and is screwed into the locking mating part 51 (threaded hole) of the fixing seat 1. By adjusting the screw's screw insertion depth, the maximum stroke of the pressure friction assembly 4 can be precisely controlled. In this embodiment, the pressure friction assembly 4 itself is made of wear-resistant material, and its bottom directly contacts the material tray 62 as a wear-resistant surface.

[0020] Working principle: as shown in the appendix Figures 86 to 89 As shown, and in combination Figures 1 to 8The working principle of this device is as follows: When the material tray 62 is loaded into the feeder, its edge presses upward against the pressure friction component 4, compressing the elastic pressure mechanism 3 (spring) and accumulating elastic potential energy. This potential energy is converted into a continuous downward pressure, which is applied to the edge of the material tray 62 through the pressure friction component 4. During the unloading operation, when the drive rollers 65 and 66 of the trolley rotate in opposite directions, the sliding friction generated by the aforementioned pressure on the side of the trolley 62 creates a resistance torque opposite to the rewinding trend, thereby effectively suppressing unintended rewinding of the trolley (i.e., preventing "slippage" and "trolley jumping"). As printing progresses, the trolley 62 becomes lighter due to the reduction in filament 63, and its moment of inertia decreases accordingly. At this time, the elastic pressure mechanism 3 can push the pressure friction assembly 4 to maintain a relatively stable positive pressure. This constant pressure is particularly crucial for suppressing rotational jumping of the lighter trolley, ensuring the reliability of the anti-rewinding effect throughout the entire process from a full trolley to an empty trolley. The locking and limiting mechanism 5 strictly limits the maximum downward stroke of the pressure friction assembly 4 relative to the fixed base 1 through mechanical blocking. By adjusting this stroke (e.g., to adapt to trolleys with diameters of 195mm or 200mm), it can be ensured that appropriate and effective pressure can be applied to trolleys 62 of different sizes.

[0021] Implementation Method B1 (Magnetic Adaptive and Replaceable Friction Components) As attached Figures 9 to 14 As shown, this embodiment provides a pressing assembly solution based on the principle of magnetic adaptive force. Its core innovation lies in using magnetic repulsion as an elastic pressure source, combined with modular replaceable friction components and magnetic attraction limiting mechanisms, which significantly improves the stability of pressure, the maintainability of the assembly, and the convenience of stroke control.

[0022] The fixed base 1 serves as the overall mounting foundation, and its structure is similar to that of embodiment A1. Initial positioning is achieved through the positioning fixing hole 12 engaging with the positioning post on the feeder cover. The screws on the fixed base fixing part 11 serve a dual purpose: firstly, to lock the fixed base 1 onto the feeder cover; secondly, to directly press the screw head against the magnet (elastic pressure mechanism 3) placed within the elastic pressure mechanism mounting part 31. This mounting part 31 is a circular recess with a through hole at its bottom center for the screw 11 to pass through. The locking fitting part 51 is the magnet mounting hole on the fixed base 1, used to accommodate and fix the limiting magnet seat 53. The guiding mechanism 2 consists of four guide posts. The pressure friction assembly 4 is fitted onto the guide posts through its guide hole 21, ensuring smooth vertical sliding. The elastic pressure mechanism 3 is a key improvement in this embodiment, and it is composed of permanent magnets. Two magnets are respectively embedded in the mounting portion 31 of the fixing base 1 and the pressure friction assembly 4, and are arranged with the same pole facing each other. The repulsive force generated between the magnets provides a downward clamping force to the pressure friction assembly 4. This non-contact pressure method avoids the fatigue problem of mechanical springs. In this embodiment, since the head shape of the screw used in the fixing portion 11 of the fixing base is flush with the surface of the magnet in the mounting portion 31, no additional protrusion is generated. Therefore, there is no need to set up a special screw avoidance mechanism 32. The replaceable friction assembly 41 is two cuboid wear-resistant blocks, and the back of the blocks is machined with replaceable friction assembly fixing threaded holes 43 (M3 nut holes). The replaceable friction assembly fixing screw 42 is an M3 screw, which is ingeniously designed to achieve "one screw with two functions": the screw passes through the central through hole of the magnet on the pressure friction assembly 4, the body of the pressure friction assembly 4, and finally screws into the nut hole 43 of the wear-resistant block 41. When tightened, the thread at the tail of screw 42 generates tension, pulling the wear-resistant block 41 tightly upward and fixing it to the bottom of the pressure friction assembly 4; at the same time, the cup head of screw 42 presses down on the magnet on the pressure friction assembly 4 to ensure its stability and prevent it from loosening. Thus, the magnet, the base of the pressure friction assembly 4, and the wear-resistant block 41 are integrated into a single module.

[0023] The locking and limiting mechanism 5 is an integral structure, with its main body being a cylinder. A circular plate-like structure is located at the top of the cylinder, forming a three-dimensional "T" shape. The cylindrical portion of the "T"-shaped limiting rod passes through the locking mechanism through-hole 52 (circular hole) on the pressure friction assembly 4. The diameter of its cylindrical portion is smaller than the through-hole 52, allowing free passage; however, the diameter of the circular plate at its top is larger than the through-hole 52. The limiting magnet moving block 54 is fixed with adhesive to the moving block mounting groove 55 at the end of the cylindrical portion of the "T"-shaped limiting rod. The limiting magnet seat 53 is fixed with adhesive to the locking mating part 51 (magnet mounting hole) of the fixing base 1. When the pressure friction assembly 4 moves upward to the predetermined stroke limit, its limiting process is as follows: Magnetic connection: The limiting magnet moving block 54 fixed at the lower end of the limiting rod first attracts the limiting magnet seat 53 fixed on the fixing base 1. This attraction tightly connects the "T"-shaped limiting rod 5 and the fixing base 1 into a single unit. Mechanical limiting: After the mechanism is connected by magnetic attraction, the position of the "T"-shaped limiting rod 5 relative to the fixed base 1 is fixed. At this time, the surface of the pressure friction component 4, which continues to move upward, is blocked by the circular plate structure at the top of the limiting rod, thereby achieving reliable mechanical limiting of its maximum stroke.

[0024] Working Principle: When the feed tray 62 is loaded into the feeder, its edge presses the pressure friction component 4 upward, compressing the gap between the magnets 3 with the same poles facing each other between the fixed seat 1 and the pressure friction component 4. The repulsive force generated by the magnets serves as a continuous clamping force, which is transmitted to the edge of the feed tray through the replaceable friction component 41 at the bottom of the pressure friction component 4. Since the pressure friction component 4 acts on the outer edge of the feed tray 62 (its diameter does not change with the remaining consumables), the gap between the magnets 3 remains essentially constant during operation, thus providing a roughly constant repulsive pressure. This continuous pressure effectively suppresses the rewinding and jumping of the feed tray due to the reverse trend during the unloading process. The replaceable friction component 41 is a wear part, connected to the pressure friction component 4 via the screws of the replaceable friction component fixing screw 42. After wear, the wear block 41 can be replaced individually simply by unscrewing the screw 42, without disassembling the entire structure. This modular design significantly reduces maintenance costs and downtime.

[0025] Stroke limitation: When the pressure friction assembly 4 moves upward to the preset stroke limit, the limit magnet moving block 54 and the limit magnet seat 53 are attracted together, so that the "T" shaped limit bar 5 and the fixed seat 1 are fixed as a whole; then, the surface of the pressure friction assembly 4 is mechanically blocked by the circular plate structure at the top of the limit bar, thereby forming a reliable stroke limit.

[0026] Maintenance advantages: The magnetic connection makes the locking and limiting mechanism 5 extremely easy to install and remove. When maintenance is required, simply pull out the "T"-shaped limiting bar to separate the pressure friction component 4 from the fixing seat 1, without the need for tools. Compared to the screw-based limiting method of A1, maintenance efficiency is significantly improved, making it particularly suitable for scenarios requiring rapid repair.

[0027] Magnetic repulsion, as an elastic pressure source, can transmit pressure without physical contact, avoiding the fatigue and wear problems of mechanical springs, and has a longer service life and more stable pressure output characteristics.

[0028] Implementation method C1 (circular wear-resistant structure and adhesive fixation) As attached Figures 15 to 18 As shown, this embodiment provides a replaceable friction component solution using a cylindrical wear-resistant rod. Its core innovation lies in achieving stable fixation of the wear-resistant component through an adhesive bonding method. The specific structure is as follows: The fixed base 1 serves as the mounting foundation. Initial positioning is achieved through the positioning and fixing holes 12, which engage with the positioning features of the feeder. Final tightening is achieved by the screws on the fixed base fixing part 11. The guiding mechanism 2 consists of four guide pillars, which engage with the guide holes 21 on the pressure friction assembly 4 to ensure its vertical movement accuracy. The elastic pressure mechanism 3 consists of two springs, installed in the annular recess of the elastic pressure mechanism mounting part 31 corresponding to the fixed base and the pressure friction assembly. A screw avoidance mechanism 32 is provided within the mounting part of the pressure friction assembly to avoid the head of the fixing screw.

[0029] The locking and limiting mechanism 5 consists of two limiting screws that pass through the locking mechanism through hole 52 of the pressure friction assembly and are screwed into the threaded hole of the locking mating part 51 of the fixed seat for adjusting the stroke.

[0030] The pressure friction assembly 4 serves as the mounting base, and its bottom is provided with a replaceable friction assembly fixing part 44. This structure is a cylindrical contoured groove that matches the shape of the replaceable friction assembly 41 (cylindrical wear-resistant rod) for initial positioning and reception of the wear-resistant rod. The wear-resistant rod 41 is firmly bonded to the fixing part 44 by epoxy resin adhesive coated on the fixing part 46. This bonding and fixing method results in uniform stress distribution and reliable connection.

[0031] Working principle: After the material tray is loaded, the pressure friction component 4 is pressed down under the action of the spring 3, causing the cylindrical wear-resistant rod 41 to fit tightly against the edge of the material tray. During material unloading, the friction generated by the wear-resistant rod effectively inhibits the material tray from rolling back and slipping. After wear, the old adhesive needs to be removed and a new wear-resistant rod needs to be re-bonded. This method provides reliable fixation and is suitable for working conditions requiring high-stability contact.

[0032] Implementation method C2 (square wear-resistant mechanism and quick-release buckle) As attached Figures 19 to 20 As shown, the core innovation of this embodiment lies in the quick assembly and disassembly structure that combines a cuboid wear-resistant block with an elastic buckle.

[0033] The structure and function of the base and general structure: the fixed seat 1, the fixed seat fixing part 11, the positioning fixing hole 12, the elastic pressure mechanism 3, the elastic pressure mechanism mounting part 31 and the screw avoidance mechanism 32 are exactly the same as those in the C1 embodiment, and will not be described again here.

[0034] The replaceable friction component 41 is a cuboid wear-resistant block. The bottom of the pressure friction component 4 has a square replaceable friction component fixing part 44 (contour groove) that matches its shape. The replaceable friction component locking buckles 45 consist of four elastic buckles evenly distributed around the contour groove 44. During installation, the square rod 41 is pressed into the groove along the guide; the buckles 45 elastically deform and spring back, locking the rod in place. During disassembly, the wear-resistant block can be removed by hand by simply pressing the buckles, without any tools.

[0035] Working principle: Its pressing and anti-rewinding working principle is the same as C1. Its biggest advantage lies in the ease of maintenance: when the wear-resistant block 41 wears out, the operator can quickly replace it by hand without tools, which greatly improves maintenance efficiency and is especially suitable for scenarios that require frequent replacement of wear parts.

[0036] Implementation method C3 (sheet-type wear-resistant structure and interference fit) As attached Figures 21 to 22 As shown, this embodiment uses a wear-resistant sheet component and an interference fit fixing method, resulting in an extremely compact structure.

[0037] The structure and function of the base and general structure: the fixed seat 1, the fixed seat fixing part 11, the positioning fixing hole 12, the elastic pressure mechanism 3, the elastic pressure mechanism mounting part 31 and the screw avoidance mechanism 32 are exactly the same as those in the C1 embodiment, and will not be described again here.

[0038] The replaceable friction assembly 41 consists of two wear-resistant plates. The pressure friction assembly 41 has two plates with corresponding mounting slots 44 on both sides. The wear-resistant plates 41 are directly pressed into the mounting slots using an interference fit, relying on friction to achieve fixation. This structure has the fewest parts and the connection is simple.

[0039] Working principle: Its pressing and anti-rewinding working principles are the same as C1. During maintenance, tools are needed to push the worn sheet out of the mounting slot before pressing in a new wear-resistant sheet. This solution has a compact structure and low cost, making it suitable for applications with limited space or cost sensitivity.

[0040] Implementation method D1 (elastic snap-locking limit) As attached Figures 23 to 26 As shown, the core innovation of this embodiment lies in replacing the traditional threaded connection with the deformation and reset mechanism of the elastic buckle, so as to realize the tool-free quick assembly and disassembly of the locking and limiting mechanism.

[0041] The fixed base 1 is initially positioned by engaging with the feeder positioning post through the positioning fixing hole 12, and is then secured by screws on the fixed base fixing part 11. The locking engagement part 51 is a cylindrical groove on the fixed base 1, with an annular inner flange at its entrance forming a locking step. The entrance diameter is smaller than the natural outward expansion dimension of the elastic buckle, but larger than the diameter of its central cylinder; the inner diameter of the groove is larger than the outward expansion dimension of the buckle, thus forming a self-locking mechanism. The guide mechanism 2 uses three circular guide posts arranged in a triangle, which engage with the guide hole 21 on the pressure friction assembly 4 to ensure vertical sliding and prevent rotation.

[0042] The elastic pressure mechanism 3 is a spring, installed in the elastic pressure mechanism mounting part 31 of the fixed base and the pressure friction assembly. A screw avoidance mechanism 32 is provided in the mounting part of the pressure friction assembly to avoid the head of the fixing screw. The bottom of the pressure friction assembly 4 directly serves as a wear-resistant surface.

[0043] The locking and limiting mechanism 5 is a T-shaped integrated structure with a pair of elastic buckles at the end. Its cylindrical body passes through the locking mechanism through hole 52 of the pressure friction assembly 4, and the diameter of the top circular piece is larger than that of the through hole 52, forming a block. During installation, the buckles are deformed under pressure and pass through the inlet of the locking mating part 51. After entering the groove, they elastically reset and open, engaging with the locking step to complete the locking.

[0044] Working principle: When the pressure friction component 4 moves upward, it is mechanically blocked by the circular plate structure of the locking and limiting mechanism 5. The stroke limit is determined by the locking height of the buckle. Quick disassembly and assembly: Installation can be completed by pressing; disassembly is achieved by simply pulling it out, and the buckle deforms and disengages, allowing for tool-free operation.

[0045] Basic functions: Spring 3 provides adaptive pressure, the wear-resistant surface inhibits the disc from rolling back and slipping, and the three guide columns ensure smooth movement.

[0046] Implementation method D2 (rectangular guide and rotary snap-locking limit) As attached Figures 27 to 30 As shown, this embodiment is an improvement on D1, using rectangular guide posts and rotating buckles to further enhance torsional stability and locking reliability.

[0047] The guide mechanism 2 consists of two rectangular guide posts that mate with the square guide holes 21 on the pressure friction assembly 4. This rectangular post and square hole design effectively restricts the circumferential rotation of the assembly, providing superior torsional stability compared to cylindrical guides.

[0048] In this embodiment, the structure and function of the fixed base 1, the fixed base fixing part 11, the positioning fixing hole 12, the elastic pressure mechanism 3, the elastic pressure mechanism mounting part 31, and the screw avoidance mechanism 32 are exactly the same as those in the D1 embodiment, and will not be described again here.

[0049] The locking and limiting mechanism 5 also has a "T"-shaped integrated structure, but its end uses a non-elastic, symmetrical rectangular buckle. The locking mating part 51 is a key structure formed on the fixed base 1. Its main body is a cylindrical groove, and the entrance of the groove has an annular inner flange, thus forming a locking step inside the groove. Based on this structure, a rectangular through groove is formed on the annular flange at the entrance. The opening size of the through groove is slightly larger than the size of the rectangular buckle at the end of the locking and limiting mechanism 5 to ensure that the buckle can be aligned and pass through.

[0050] The cylindrical portion of the "T"-shaped limiting rod 5 passes through the locking mechanism through hole 52 on the pressure friction assembly 4. The diameter of its top circular piece is larger than that of the through hole 52. The engagement relationship between the buckle and the through groove is as follows: the buckle is smaller than the through groove and can be aligned and pass through in a specific direction; however, when the buckle passes through the through groove and rotates 90°, its long side can no longer retract from this rectangular through groove, thus forming mechanical interference with the engaging step in the groove to achieve locking.

[0051] Working principle: Installation and locking: Align the buckle with the through slot and insert it vertically, then rotate the limiting mechanism 5 approximately 90°. At this point, the long side of the buckle is misaligned with the through slot, and the back engages with the step inside the groove, creating mechanical interference and achieving locking.

[0052] Disassembly and Maintenance: Simply rotate 90° in the opposite direction to realign the slots, then pull out the limiting mechanism. No tools are required throughout the process, making maintenance highly convenient. Advantages: The rectangular guide post ensures no deflection of the pressure friction assembly under asymmetrical force, resulting in more uniform pressure distribution. The rotating buckle is a purely mechanical structure, avoiding the risk of fatigue in elastic elements, and the locking state is more intuitive and reliable.

[0053] E1 Implementation Method (Cross-shaped Guide and Magnetic Adjustable Travel Limit) As attached Figures 31 to 41 As shown, the core innovation of this embodiment lies in the collaborative design of a cross-shaped guide post and a magnetic adjustable stroke limit mechanism, achieving precise stroke control and rapid adjustment through structural optimization. Its components are as follows: The fixed base 1 serves as the overall installation foundation. Initial positioning is achieved through the positioning hole 12, which engages with the positioning post on the feeder cover. It is then secured with screws on the fixed base fixing part 11. The fixed base is equipped with a guide mechanism 2, whose top has a locking engagement part 51, a circular recessed structure used to install the limiting magnet seat 53. The guide mechanism 2 is a single guide post with a cross-shaped cross-section, engaging with the guide and limiting composite hole 2152 on the pressure friction assembly 4. This composite hole is a single hole integrating the functions of the traditional guide hole 21 and the locking mechanism through hole 52. Its cross-shaped structure effectively restricts the circumferential rotation of the assembly, ensuring precise vertical sliding. The elastic pressure mechanism 3 consists of two springs housed within the elastic pressure mechanism mounting part 31 of the fixed base and the pressure friction assembly. The bottom of the pressure friction assembly 4 directly serves as a wear-resistant surface, and its interior has a screw avoidance mechanism 32 to prevent screw interference.

[0054] The locking and limiting mechanism includes two specifications: Standard stroke locking and limiting mechanism 5: It has a cap-shaped structure with an internal contoured limiting clearance 56 to match the shape of the cross guide post, and the limiting magnet moving block 54 is fixed by the moving block mounting slot 55. Short stroke locking and limiting mechanism 501: The structure is the same as the standard mechanism, but the contoured limiting clearance 56 is lengthened to shorten the stroke.

[0055] The limiting magnet base 53 is fixed inside the locking engagement part 51 of the fixed base 1, and is locked to the limiting magnet moving block 54 by magnetic attraction. The magnets are all fixed with glue to ensure reliable connection.

[0056] Working principle: When the pressure friction assembly 4 moves upward, its movement is blocked by the mechanical structure of the locking and limiting mechanism 5 or 501. Specifically: the limiting magnet moving block 54 and the limiting magnet seat 53 first attract each other, making the locking and limiting mechanism and the fixed seat a whole. Mechanical limiting: the top surface of the pressure friction assembly 4 directly contacts the cap structure of the locking and limiting mechanism 5 or 501, forming a hard limit. The stroke limit is determined by the depth of the contour limiting clearance 56 of the limiting mechanism: the standard mechanism 5 allows a larger stroke (e.g., 10mm), while the short stroke mechanism 501 shortens the stroke (e.g., 5mm) by deepening the cavity, adapting to different diameter trays (e.g., 195mm or 200mm).

[0057] When replacing the limiting mechanism, simply pull out the old mechanism by hand, align the new mechanism's contoured limiting clearance 56 with the top of the cross guide post, and press it down. Once the magnet engages, the installation is complete. The entire process requires no tools and takes only a few seconds. This design achieves stepless stroke adjustment by replacing limiting mechanisms of different depths, solving the problems of cumbersome adjustment and the need for specialized tools in traditional limiting devices.

[0058] Spring 3 provides adaptive downward pressure, causing the pressure friction assembly 4 to press firmly against the edge of the material tray. During material retraction, the friction surface inhibits the material tray from rolling back and slipping, and the cross guide post ensures uniform pressure distribution and avoids uneven loading.

[0059] E2 Implementation (H-shaped guide with magnetic adjustable stroke limit and replaceable friction assembly) As attached Figures 42 to 47 As shown, this embodiment provides a pressing assembly solution employing an H-shaped guide post, a magnetically adjustable stroke limiting mechanism, and replaceable friction components. Its core innovation lies in enhancing torsional stability through the precise fit between the H-shaped guide post and the composite hole, and in achieving rapid stroke adjustment and convenient replacement of worn parts by combining replaceable friction components and a magnetically adjustable limiting cap.

[0060] In this embodiment, the structure and function of the fixed base 1, the fixed base fixing part 11, the positioning fixing hole 12, the elastic pressure mechanism 3, the elastic pressure mechanism mounting part 31, and the screw avoidance mechanism 32 are exactly the same as those in the E1 embodiment, and will not be described again here.

[0061] The guide mechanism 2 is one of the key improvements in this embodiment, consisting of a guide post with an H-shaped cross-section. The pressure friction assembly 4 serves as the mounting base, and its core structure is a guide and limiting composite hole 2152 that matches the shape of the H-shaped guide post 2. This composite hole integrates the functions of the traditional guide hole 21 and the locking mechanism through hole 52, allowing the pressure friction assembly 4 to slide smoothly along the axial direction of the H-shaped guide post and effectively restricting its circumferential rotation. The replaceable friction assembly 41 consists of two wear-resistant plates, initially positioned by the replaceable friction assembly fixing part 44 (i.e., the wear-resistant plate contour structure on both sides of the pressure friction assembly). The contact surfaces of the replaceable friction assembly 41 and the fixing part 44 are fixed by welding with the adhesive fixing part 46, ensuring connection strength.

[0062] The locking fitting part 51 is located in the circular recess at the center of the top of the H-shaped guide post, and is used to install the limiting magnet seat 53 fixed by adhesive. The locking limiting mechanism 5 is a cap-shaped structure, and its interior is provided with a contour-following limiting clearance 56 that matches the shape of the H-shaped guide post. At the end of the mechanism, the moving block mounting groove 55 is fixed with a limiting magnet moving block 54 by adhesive. When the locking limiting mechanism 5 is fitted into the top of the H-shaped guide post, the limiting magnet moving block 54 and the limiting magnet seat 53 are attracted to each other, so that the limiting mechanism and the fixed seat 1 are fixed together. (Supplementary explanation) Although only the standard stroke locking limiting mechanism 5 is shown in the figure, those skilled in the art will understand that by designing limiting mechanisms with different depths of contour-following limiting clearance 56 (e.g., shallower or deeper clearances), the stroke of the pressure friction assembly 4 can be adjusted to adapt to different sizes of trays. Such a modified design should be considered to fall within the protection scope of this invention.

[0063] Working principle: When the pressure friction component 4 travels along the H-shaped guide post to the predetermined stroke limit, its top surface is mechanically blocked by the cap structure of the locking and limiting mechanism 5. The stroke limit is determined by the depth of the contour-following limiting clearance 56. By replacing the locking and limiting mechanism with different clearance depths, the stroke can be flexibly adjusted, for example, to adapt to material trays of different diameters. When the stroke needs to be adjusted, the locking and limiting mechanism 5 can be removed and replaced by hand without tools, resulting in high adaptation efficiency.

[0064] Wear-resistant plates 41, as vulnerable components that directly contact the material tray, are fixed to both sides of the pressure friction assembly 4 by welding. After wear, the entire pressure friction assembly 4 can be replaced, or the wear-resistant plates can be peeled off and re-welded using specialized tools, significantly reducing long-term maintenance costs.

[0065] The H-shaped guide post has a larger mating area with the composite hole 2152, which further enhances the torsional resistance and motion stability of the pressure friction assembly 4 compared to the cross-shaped or circular guide structure, ensuring that the pressure is applied evenly to the edge of the material tray. The spring 3 provides adaptive pressure, causing the wear-resistant plate 41 to press tightly against the material tray, and suppressing the back-rolling and slippage during material retraction through friction.

[0066] E3 Implementation (Hexagonal Guide with Magnetic Adjustable Stroke Limit and Replaceable Friction Components) As attached Figures 48 to 53 As shown, this embodiment provides a pressing assembly solution employing a hexagonal guide post, a magnetically adjustable stroke limiting mechanism, and replaceable friction components. Its core innovation lies in enhancing torsional stability through the precise fit between the hexagonal guide post and the composite hole, and in achieving rapid stroke adjustment and convenient replacement of worn parts by combining replaceable friction components and a magnetically limiting cap.

[0067] In this embodiment, the structure and function of the fixed base 1, the fixed base fixing part 11, the positioning fixing hole 12, the elastic pressure mechanism 3, the elastic pressure mechanism mounting part 31, and the screw avoidance mechanism 32 are exactly the same as those in the E1 embodiment, and will not be described again here.

[0068] The guide mechanism 2 is one of the key improvements in this embodiment, consisting of a guide post with a hexagonal cross-section. The pressure friction assembly 4 serves as the mounting base, and its core structure is a guide and limiting composite hole 2152 that matches the shape of the hexagonal guide post 2. This composite hole integrates the functions of the traditional guide hole 21 and the locking mechanism through hole 52, allowing the pressure friction assembly 4 to slide smoothly along the axial direction of the hexagonal guide post and effectively restricting its circumferential rotation. The replaceable friction assembly 41 consists of two wear-resistant cuboids, initially positioned by the replaceable friction assembly fixing part 44 (i.e., the wear-resistant cuboid contour structure on both sides of the pressure friction assembly). The contact surfaces of the wear-resistant cuboids 41 and the fixing part 44 are fixed by welding with the adhesive fixing part 46, ensuring connection strength.

[0069] The locking fitting part 51 is located in the circular recess at the center of the top of the hexagonal guide post and is used to install the limiting magnet seat 53, which is fixed with glue. The locking limiting mechanism 5 is a cap-shaped structure, and its interior is provided with a contour-following limiting clearance 56 that matches the shape of the hexagonal guide post. The moving block mounting groove 55 at the end of the mechanism is fixed with glue to the limiting magnet moving block 54. When the locking limiting mechanism 5 is fitted into the top of the hexagonal guide post, the limiting magnet moving block 54 and the limiting magnet seat 53 are attracted to each other, so that the limiting mechanism and the fixed seat 1 are fixed together. (Supplementary explanation) Although only the standard stroke locking limiting mechanism 5 is shown in the figure, those skilled in the art will understand that by designing limiting mechanisms with different depths of contour-following limiting clearance 56 (e.g., shallower or deeper clearances), the stroke of the pressure friction assembly 4 can be adjusted to adapt to different sizes of trays. Such a modified design should be considered to fall within the protection scope of this invention.

[0070] Working principle: When the pressure friction component 4 travels along the hexagonal guide post to the predetermined stroke limit, its top surface is mechanically blocked by the cap structure of the locking and limiting mechanism 5. The stroke limit is determined by the depth of the contour-following limiting clearance 56. By replacing the locking and limiting mechanism with different clearance depths, the stroke can be flexibly adjusted, for example, to adapt to material trays of different diameters. When the stroke needs to be adjusted, the locking and limiting mechanism 5 can be removed and replaced by hand without tools, resulting in high adaptation efficiency.

[0071] The wear-resistant cuboid 41, as a vulnerable component that directly contacts the material tray, is fixed to both sides of the pressure friction assembly 4 by welding. After wear, the pressure friction assembly 4 can be replaced as a whole, or the wear-resistant cuboid can be peeled off and re-welded using professional tools, significantly reducing long-term maintenance costs.

[0072] The core advantages and anti-winding function of the hexagonal guide structure: superior guiding accuracy and production economy: Compared with the asymmetrical guide structures such as the H-shape in the E2 implementation, the regular hexagonal guide post 2 has extremely high geometric symmetry and dimensional consistency (such as the ability to stably control the edge distance tolerance within the precision machining range). This characteristic makes it easier to clamp and position during machining processes such as milling and grinding, and facilitates rapid and accurate inspection using conventional measuring tools (such as micrometers). This significantly reduces the machining difficulty, time cost, and dependence on special tooling for precision guide components, thereby ensuring guiding accuracy while possessing better production economy and batch manufacturing stability.

[0073] A reliable anti-rewinding and stability mechanism: The adaptive pressure provided by the elastic pressure mechanism 3 (spring) is transmitted to the replaceable friction component 41 (wear-resistant cuboid) through the pressure friction component 4, making it tightly press against the edge of the material tray 62. The uniform and continuous multiple contact surfaces between the hexagonal guide post and the composite hole 2152 ensure that the pressure friction component 4 will not deflect or jam when subjected to potentially asymmetrical frictional forces, thereby generating a continuous and positively oriented frictional force, effectively suppressing the rewinding, slippage, and jumping of the material tray during material ejection, and ensuring the stability of feeding.

[0074] E4 Implementation (Rectangular Guide with Magnetic Adjustable Travel Limit and Replaceable Friction Components) As attached Figures 54 to 59 As shown, this embodiment provides a pressing assembly solution employing a rectangular guide post, a magnetically adjustable stroke limiting mechanism, and replaceable friction components. Its core innovation lies in enhancing torsional stability through the precise fit between the rectangular guide post and the composite hole, and in achieving rapid stroke adjustment and convenient replacement of worn parts by combining replaceable friction components and a magnetically limiting cap.

[0075] In this embodiment, the structure and function of the fixed base 1, the fixed base fixing part 11, the positioning fixing hole 12, the elastic pressure mechanism 3, the elastic pressure mechanism mounting part 31, and the screw avoidance mechanism 32 are exactly the same as those in the E1 embodiment, and will not be described again here.

[0076] The guide mechanism 2 is one of the key improvements in this embodiment, consisting of a guide post with a rectangular cross-section. The pressure friction assembly 4 serves as the mounting base, and its core structure is a guide and limiting composite hole 2152 that matches the shape of the rectangular guide post 2. This composite hole integrates the functions of the traditional guide hole 21 and the locking mechanism through hole 52, allowing the pressure friction assembly 4 to slide smoothly along the axial direction of the rectangular guide post and effectively restricting its circumferential rotation. The replaceable friction assembly 41 consists of two wear-resistant cylindrical rods, initially positioned by the replaceable friction assembly fixing part 44 (i.e., the wear-resistant cylindrical rod contour structure on both sides of the pressure friction assembly). The contact surfaces of the wear-resistant cylindrical rods 41 and the fixing part 44 are firmly fixed by the adhesive fixing part 46 (adhesive), ensuring connection strength.

[0077] The locking fitting part 51 is located in a circular recess at the center of the top of the rectangular guide post for mounting the limiting magnet seat 53, which is fixed with glue. The locking limiting mechanism 5 is a cap-shaped structure, with a contoured limiting clearance 56 inside that matches the shape of the rectangular guide post. The moving block mounting groove 55 at the end of the mechanism has a limiting magnet moving block 54 fixed with glue. When the locking limiting mechanism 5 is fitted into the top of the rectangular guide post, the limiting magnet moving block 54 and the limiting magnet seat 53 are attracted to each other, so that the limiting mechanism and the fixed seat 1 are fixed together. (Supplementary explanation) Although only the standard stroke locking limiting mechanism 5 is shown in the figure, those skilled in the art will understand that by designing limiting mechanisms with different depths of contoured limiting clearance 56 (e.g., shallower or deeper clearances), the stroke of the pressure friction assembly 4 can be adjusted to adapt to different sizes of trays. Such a modified design should be considered to fall within the protection scope of this invention.

[0078] Working principle: When the pressure friction component 4 moves upward along the rectangular guide post to the predetermined stroke limit, its top surface is mechanically blocked by the cap structure of the locking and limiting mechanism 5. The stroke limit is determined by the depth of the contour-following limiting clearance 56. When the stroke needs to be adjusted, the locking and limiting mechanism 5 can be removed and replaced by hand without tools, resulting in high adaptation efficiency. By replacing the limiting mechanism with one of different depths of contour-following limiting clearance 56, it can flexibly adapt to trays of different diameters.

[0079] The wear-resistant cylindrical rod 41, as a vulnerable part that directly contacts the material tray, is bonded and fixed to both sides of the pressure friction assembly 4 via the adhesive fixing part 46 (adhesive). After wear, the pressure friction assembly 4 can be replaced as a whole, or the old adhesive can be removed and the wear-resistant cylindrical rod re-bonded using professional methods, significantly reducing long-term maintenance costs.

[0080] Guiding stability: The symmetrical design of the rectangular guide post and the composite hole 2152 provides a stable guiding contact surface, which effectively enhances the anti-torsion ability and motion stability of the pressure friction assembly 4, and ensures that the pressure is applied evenly to the edge of the tray.

[0081] Advantages of injection molding: The rectangular cross-section has a regular shape and no complex curved surfaces or sharp angles, which makes the corresponding mold cavity processing simpler and the demolding resistance low. This helps to reduce internal stress during injection molding and avoid warping deformation, thereby significantly improving the dimensional accuracy and molding consistency of the guide pillars and composite holes 2152, and reducing production costs.

[0082] Basic function: Spring 3 provides adaptive pressure, which makes the wear-resistant cylindrical bar 41 press tightly against the material tray, and suppresses the rewinding and slippage during material unloading through friction.

[0083] E5 Implementation Method (Rectangular Guide and Mechanical Snap-on Locking Limit) As attached Figures 60 to 63As shown, this embodiment provides a pressing assembly solution using a rectangular guide post and a mechanical snap-locking and limiting mechanism. Its core innovation lies in the purely mechanical cooperation between the through-hole on the side of the rectangular guide post and the integrated elastic snap-lock, achieving quick assembly and disassembly without magnetic components and stroke limiting. This simplifies the structure and reduces costs while ensuring reliability.

[0084] In this embodiment, the structure and function of the fixed base 1, the fixed base fixing part 11, the positioning fixing hole 12, the elastic pressure mechanism 3, the elastic pressure mechanism mounting part 31, and the screw avoidance mechanism 32 are exactly the same as those in the E1 embodiment, and will not be described again here.

[0085] The guide mechanism 2 is a key improvement in this embodiment, consisting of a guide post with a rectangular cross-section. Two rectangular through holes are opened on the side of the guide post, serving as locking fitting parts 51. The pressure friction assembly 4 serves as the mounting base, and its core structure is a guide and limiting composite hole 2152 that matches the shape of the rectangular guide post 2. This composite hole integrates the functions of the traditional guide hole 21 and the locking mechanism through hole 52, allowing the pressure friction assembly 4 to slide smoothly along the axial direction of the rectangular guide post and effectively restricting its circumferential rotation. The replaceable friction assembly 41 consists of two wear-resistant cylindrical rods, initially positioned by the replaceable friction assembly fixing part 44 (i.e., the wear-resistant cylindrical rod contour structure on both sides of the pressure friction assembly). The contact surfaces of the wear-resistant cylindrical rods 41 and the fixing part 44 are firmly fixed by the adhesive fixing part 46 (adhesive).

[0086] The locking and limiting mechanism 5 is a key improvement in this embodiment; it is an integrally molded T-shaped mechanical buckle. This buckle is divided into three functional parts from front to back: Head: a rectangular block whose length is greater than the width of the locking engagement part 51 (the rectangular through hole on the side of the guide post), primarily serving a locking and blocking function. Middle: a contoured structure with a cross-sectional dimension slightly smaller than the through hole of the locking engagement part 51, facilitating alignment and passage. Tail: equipped with a pair of elastic buckles whose outward extension in their natural state is greater than the width of the through hole of the locking engagement part 51.

[0087] During installation, align the tail and middle of the locking and limiting mechanism 5 with the rectangular through hole (locking mating part 51) on the side of the guide post and insert it. After applying pressure, the elastic buckle at the tail is squeezed by the hole wall and deforms inward, allowing the entire mechanism to pass through the hole. When the buckle has completely passed through the through hole, it quickly returns to its original position and opens under its own elasticity. Since the length of the head is greater than the width of the through hole and the outward extension dimension of the elastic buckle at the tail is also greater than the width of the hole, the buckle 5 is reliably locked on the guide post 2 and cannot be dislodged.

[0088] Working Principle: When the pressure friction component 4 moves upward along the rectangular guide post 2 to the predetermined stroke limit, its top surface is mechanically blocked by the head structure of the locking and limiting mechanism 5. The limit position of this stroke is determined by the height of the latch 5 locked on the through hole 51 on the side of the guide post. This purely mechanical blocking method is reliable and intuitive. Installation: Simply align the T-shaped latch 5 with the rectangular through hole 51 on the side of the guide post and press it down. The tail elastic latch deforms under the pressure of the hole wall and passes through, then resets and opens, achieving quick locking. Disassembly: When replacement or adjustment is required, simply pull the locking and limiting mechanism 5 outward by hand. When pulling out, the tail elastic latch will automatically undergo inward elastic deformation under the action of the inner wall of the through hole 51, allowing the latch 5 to exit from the hole. This press-and-pull operation requires no tools and no additional unlocking action (such as squeezing the latch), making the operation extremely intuitive and convenient. This design simplifies the structure, reduces costs, and elevates the convenience of maintenance to a new level.

[0089] Spring 3 provides adaptive downward pressure, causing the wear-resistant cylindrical bar 41 at the bottom of the pressure friction assembly 4 to press firmly against the edge of the material tray 62. During material retraction, the generated friction effectively inhibits the material tray from rolling back and slipping. The cooperation between the rectangular guide post and the composite hole 2152 ensures the smoothness and torsional resistance of the movement of the pressure friction assembly 4.

[0090] F1 Implementation (Removable Guide Post and Friction Limiting Assembly) As attached Figures 64 to 67 As shown, this embodiment provides a pressing assembly solution employing a detachable guide post and a friction limiting structure. Its core innovation lies in the direct frictional contact between the detachable wear-resistant guide post and the replaceable friction assembly. This achieves the guiding function while mechanically limiting the rotation of the pressure friction assembly through friction, and improves the maintainability of key wear components through modular design.

[0091] The fixed base 1 serves as the overall installation foundation. It achieves initial positioning by engaging with the feeder positioning post through the positioning fixing holes 12, and is finally tightened by the screws (such as M3 self-tapping screws) on the fixed base fixing part 11. The guide mechanism mounting part 22 consists of holes on the fixed base 1 for mounting the guide posts. The guide mechanism 2 comprises four detachable wear-resistant cylindrical rods, which are firmly bonded and fixed to the guide mechanism mounting part 22 via the guide mechanism adhesive fixing part 23 (adhesive).

[0092] The four guide posts are arranged symmetrically, and their spacing is precisely calculated to be slightly larger than the cross-sectional dimensions of the wear-resistant cylindrical rod of the replaceable friction assembly 41, providing space for friction limiting.

[0093] The pressure friction assembly 4 serves as the mounting base and is fitted onto the four guide posts through the guide hole 21 (a contoured hole that matches the cross-sectional shape of the guide post). The guide hole 21 has a small square groove on the side near the replaceable friction assembly 41 to provide clearance and space for frictional contact.

[0094] The replaceable friction component 41 is a wear-resistant cylindrical rod, which is initially positioned by the replaceable friction component fixing part 44 (i.e., the wear-resistant cylindrical rod contour structure on the pressure friction component) and finally fixed by the adhesive fixing part 46 (adhesive).

[0095] The elastic pressure mechanism 3 consists of two springs, housed within the corresponding annular elastic pressure mechanism mounting portions 31 on the fixed base 1 and the pressure friction assembly 4. The mounting portion on the pressure friction assembly 4 is equipped with a screw avoidance mechanism 32 to avoid the head of the fixing screw.

[0096] The locking and limiting mechanism 5 consists of two limiting screws. They pass through the locking mechanism through hole 52 on the pressure friction assembly 4 and are screwed into the locking mating part 51 (threaded hole) on the fixed base 1. The maximum downward stroke of the pressure friction assembly 4 is limited by adjusting the screwing depth.

[0097] Working Principle: When the pressure friction assembly 4 is loaded into the tray and moves upward under pressure, or is subjected to lateral force during operation, its movement is doubly restricted: X-direction translation restriction: Through the precise fit between the guide hole 21 and the four guide posts 2, it is ensured that the pressure friction assembly 4 can only slide smoothly along the axial direction (vertical direction) of the guide posts. Y-direction rotation restriction: When the pressure friction assembly 4 tends to rotate, the side of the replaceable friction assembly 41 (wear-resistant cylindrical rod) fixed on it will come into direct contact with the four symmetrically arranged guide posts 2 and generate sliding friction. Since both are made of wear-resistant materials, this friction can effectively consume rotational energy, form a reliable mechanical friction limit, and suppress the circumferential rotation or oscillation of the pressure friction assembly 4.

[0098] Both the guide post 2 and the friction assembly 41 are wear parts and adopt a detachable modular design. When they wear out due to long-term friction, the guide post or the wear-resistant cylindrical bar can be replaced individually without replacing the entire fixed seat 1 or the pressure friction assembly 4, which significantly reduces long-term maintenance costs.

[0099] Since the guiding function and the rotation limiting function are respectively undertaken by the wear-resistant guide column 2 and the wear-resistant cylindrical rod 41, and the wear is evenly distributed by the optimized arrangement, the service life of the device is improved as a whole.

[0100] Its basic pressing and anti-rewinding working principle is the same as that of embodiment A1. After the material tray is loaded, the spring 3 provides downward pressure, causing the pressure friction component 4 to press the edge of the material tray, and suppressing rewinding and slippage during material unloading through the generated friction.

[0101] F2 Implementation Method (Rectangular Guide, Magnetic Limiting and Friction Anti-rotation Component) As attached Figures 68 to 73 As shown, this embodiment provides a pressing assembly solution that employs two rectangular guide posts, a magnetic locking and limiting mechanism, and a friction anti-rotation structure. Its core innovation lies in achieving guiding and anti-rotation functions through the precise fit between the double rectangular guide posts and the composite hole, and significantly improving connection reliability through a multi-magnetic adsorption stop structure.

[0102] The fixed base 1 serves as the overall mounting foundation. Initial positioning is achieved through the positioning holes 12, which engage with the positioning posts on the feeder cover. Final tightening is achieved using screws (such as M3 self-tapping screws) on the fixed base fixing part 11. The fixed base 1 has an elastic pressure mechanism mounting part 31 to accommodate the spring. The guide mechanism 2 consists of two rectangular guide posts arranged symmetrically. Their spacing is precisely calculated, slightly larger than the cross-sectional dimensions of the wear-resistant cylindrical rod of the replaceable friction assembly 41, providing space for friction limiting. The pressure friction assembly 4 serves as the mounting base. Its core structure is a guide and limiting composite hole 2152 that matches the shape of the two rectangular guide posts 2. This composite hole integrates the functions of a traditional guide hole 21 and a locking mechanism through hole 52.

[0103] The replaceable friction component 41 is a wear-resistant cylindrical rod, initially positioned by the replaceable friction component fixing part 44 (i.e., the wear-resistant cylindrical rod contour structure on the pressure friction component), and finally firmly fixed by the adhesive fixing part 46 (adhesive). The elastic pressure mechanism 3 consists of two springs, housed in the corresponding annular elastic pressure mechanism mounting parts 31 on the fixing base 1 and the pressure friction component 4. The mounting part on the pressure friction component 4 is provided with a screw avoidance mechanism 32 to avoid the head of the fixing screw. The locking mating part 51 consists of four circular recesses at the top of the two rectangular guide posts 2, each recess having a limiting magnet seat 53 fixed in it with glue. The locking limiting mechanism 5 is a rectangular stop, with four limiting magnet moving blocks 54 correspondingly fixed in the moving block mounting groove 55 at its bottom with glue.

[0104] Advantages of the four-magnet layout: The symmetrical arrangement of four magnets significantly increases the adsorption contact area compared to single or dual magnet designs, resulting in a more uniform magnetic circuit distribution and stronger adsorption force. This allows the locking and limiting mechanism 5 to maintain extremely high connection stability even under vibration, effectively preventing accidental loosening. When limiting is required, the locking and limiting mechanism 5 is placed on the top of the guide post, and the limiting magnet moving block 54 at its bottom automatically engages with the limiting magnet seat 53 on the fixed base under magnetic force, firmly fixing the stop block 5.

[0105] Working principle: such as Figure 72 and Figure 73As shown, it highlights the working relationship between the core components: the fixed base 1, the guide mechanism 2, the replaceable friction assembly 41, and the locking and limiting mechanism 5.

[0106] Anti-torsion mechanism: When the pressure friction assembly 4 is working or subjected to lateral force, its movement is subject to dual constraints: Y-direction rotation restriction: The side of the replaceable friction assembly 41 (wear-resistant cylindrical rod) will directly contact and slide against the two rectangular guide posts 2, effectively suppressing rotation in the Y direction. X-direction rotation restriction: The short side planes of the two rectangular guide posts 2 and the inner walls of the guide and limiting composite holes 2152 on the pressure friction assembly 4 form four contact surfaces. When the pressure friction assembly 4 has a tendency to rotate, these contact surfaces generate sliding friction, effectively restricting rotation in the X direction.

[0107] Stroke limit mechanism: When the pressure friction component 4 moves upward to the predetermined stroke limit, the top of the replaceable friction component 41 will directly contact the bottom surface of the locking limit mechanism 5 (rectangular stop block) to form a reliable mechanical hard limit.

[0108] The structural advantages of multi-magnet adsorption: The locking and limiting mechanism 5 achieves fixation through the corresponding attraction of its four limiting magnet moving blocks 54 at the bottom with the four limiting magnet seats 53 on the fixed base. The parallel layout of multiple magnets not only significantly increases the total adsorption force, but also, due to its symmetrical distribution, ensures that the adsorption force is evenly applied to the entire contact surface, significantly enhancing the ability to resist transverse shear forces.

[0109] This design ensures that the locking and limiting mechanism 5 maintains an extremely stable locked state when the equipment is subjected to continuous vibration or slight impact during operation, fundamentally avoiding accidental unlocking or positional displacement caused by vibration, and improving the reliability and safety of the entire device.

[0110] Its basic pressing and anti-rewinding working principle is the same as that of embodiment A1. After the material tray 62 is loaded, the spring 3 provides adaptive downward pressure, causing the pressure friction component 4 to press the edge of the material tray, and the generated friction force effectively suppresses rewinding and slippage during material unloading.

[0111] F3 Implementation Method (Rectangular Guide and Magnetic Limiting and Composite Wear-Resistant Anti-Rotation Component) As attached Figures 74 to 85 As shown, this embodiment provides a pressing assembly solution that employs two rectangular guide posts, a magnetic locking and limiting mechanism, a circumferential wear-resistant rod array, and replaceable friction components. Its core innovation lies in constructing a multi-layered friction anti-rotation mechanism through the coordinated layout of the circumferential wear-resistant rods and guide posts, and combining this with a locking and limiting mechanism featuring a contoured structure to achieve flexible adjustment and stable limiting of the stroke.

[0112] The fixed base 1 serves as the overall mounting foundation. It achieves initial positioning by engaging with the positioning pins on the feeder cover through the positioning and fixing holes 12, and is finally tightened by the screws (such as M3 self-tapping screws) on the fixing part 11 of the fixed base. The fixed base 1 is provided with an elastic pressure mechanism mounting part 31 to accommodate the spring.

[0113] The guide mechanism 2 consists of two rectangular guide posts. The circumferential wear-resistant rods 24 are four cylindrical wear-resistant rods, installed in the wear-resistant rod mounting holes 25 via an interference fit. The wear-resistant rod mounting holes 25 are four cylindrical blind holes located inside the two rectangular guide posts, with exhaust and ejection holes 26 at their bottom. This design ensures smooth airflow during installation and facilitates the removal of the wear-resistant rods from the bottom during maintenance.

[0114] The positions of the four wear-resistant rods are precisely calculated so that the circumferential wear-resistant rods 24 are evenly distributed around the guide mechanism 2 after installation. Approximately three-quarters of the cross-section of each wear-resistant rod is embedded in the hole, while one-quarter of the cross-section is exposed, directly forming a friction pair with the replaceable friction assembly 41.

[0115] The pressure friction assembly 4 serves as the mounting base, and its core structure is a guide and limit composite hole 2152 that is adapted to the shape of the two rectangular guide posts 2. This composite hole integrates the functions of the traditional guide hole 21 and the locking mechanism through hole 52.

[0116] The replaceable friction component 41 is a wear-resistant cylindrical rod, which is initially positioned by the replaceable friction component fixing part 44 (i.e., the wear-resistant cylindrical rod contour structure on the pressure friction component) and finally firmly fixed by the adhesive fixing part 46 (adhesive).

[0117] The elastic pressure mechanism 3 consists of two springs, housed within the corresponding annular elastic pressure mechanism mounting portions 31 on the fixed base 1 and the pressure friction assembly 4. The mounting portion on the pressure friction assembly 4 is equipped with a screw avoidance mechanism 32 to avoid the head of the fixing screw.

[0118] The locking mating part 51 consists of four circular recesses located at the top of the two rectangular guide posts 2, and each recess is fixed with a limiting magnet seat 53 by glue.

[0119] The locking and limiting mechanism 5 is a rectangular stop block, with four limiting magnet moving blocks 54 fixed in the moving block mounting groove 55 at its bottom by adhesive. This mechanism also features a circumferential wear-resistant rod clearance 57 to avoid the extended circumferential wear-resistant rod 24, ensuring smooth closing of the locking and limiting mechanism 5. More importantly, its working surface is provided with a limiting contour recess 58 or a limiting contour protrusion 59, which matches the cross-sectional shape of the replaceable friction assembly 41. The depth of the recess or the height of the protrusion directly determines the effective stroke of the pressure friction assembly 4. Stroke adjustment can be achieved by replacing the locking and limiting mechanism with a different depth of recess or height of protrusion, such as the standard locking and limiting mechanism 5 and the short-stroke locking and limiting mechanism 501.

[0120] When a limit is required, the locking and limiting mechanism 5 is placed on the top of the guide column, and the limiting magnet moving block 54 at its bottom and the limiting magnet seat 53 on the fixed seat automatically attract and fix under the action of magnetic force.

[0121] Working principle: such as Figure 78 and Figure 79 As shown, it highlights the cooperation relationship between the core components: the fixed base 1, the guide mechanism 2, the circumferential wear-resistant rod 24, the replaceable friction component 41, the locking and limiting mechanism 5, and the limiting contour recess 58.

[0122] Anti-torsion mechanism: When the pressure friction component 4 is in operation or subjected to lateral force, its movement is subject to multiple constraints: Circumferential friction restriction: The side of the replaceable friction component 41 (wear-resistant cylindrical rod) will directly contact and slide against the exposed surfaces of the four circumferential wear-resistant rods 24. This layout combines the circumferential constraint advantages of the F1 implementation (multi-pin) and the guiding stability of the F2 implementation (rectangular guide post), forming a uniform and efficient multi-point friction anti-torsion mechanism that can effectively suppress rotational tendencies in all directions.

[0123] Stroke limiting and adjustment mechanism: When the pressure friction component 4 moves upward to the predetermined stroke limit, the top of the replaceable friction component 41 will be embedded in the limiting profile recess 58 of the locking limiting mechanism 5 or contact the bottom surface of the limiting profile protrusion 59, forming a mechanical hard limit. The deeper the profile recess, the greater the effective stroke; the higher the profile protrusion, the smaller the effective stroke. By replacing different specifications of the locking limiting mechanism 5 or 501, the stroke of the pressure friction component 4 can be flexibly and precisely adjusted to adapt to trays of different diameters.

[0124] The locking and limiting mechanism 5 is magnetically engaged, allowing for easy insertion and removal by hand, thus enabling tool-free and rapid adjustment of the travel.

[0125] After the circumferential wear-resistant rod 24 wears out, it can be pushed out of the wear-resistant rod mounting hole 25 through the venting hole 26 using a tool, without damaging the original structure, making maintenance convenient and low-cost.

[0126] Its basic pressing and anti-rewinding working principle is the same as that of embodiment A1. After the material tray 62 is loaded, the spring 3 provides adaptive downward pressure, causing the pressure friction component 4 to press the edge of the material tray, and the generated friction force effectively suppresses rewinding and slippage during material unloading.

[0127] Feeder assembly implementation method As attached Figures 86 to 89 As shown, this feeder assembly is a modular feeding device for multi-color 3D printers. Its core function is to stably support the feed tray and precisely control the feeding and retraction of the filament. The following is a detailed description of each component: The feeder body 6 serves as the housing foundation for the entire feeder, housing and supporting the internal components. The feeder cover 61 is fixedly connected to the feeder body 6 via a hinge structure, forming a closed structure. It is equipped with feeder cover positioning posts 64, which are two cylindrical protrusions with pre-drilled threaded holes in the middle. The feed tray 62 is used to wind and store consumable filaments 63, and it rests directly on the roller surfaces of the front 65 and rear 66 of the feed tray drive rollers, directly supported and driven by the rollers. The front 65 and rear 66 of the feed tray drive rollers are two parallel rollers, mounted on the feeder body 6 via bearings. The key feature is that the front 65 of the feed tray drive roller is directly driven by an external drive mechanism (such as a stepper motor); the rear 66 of the feed tray drive roller is configured as a driven roller, rotating according to the friction between itself and the feed tray 62. The two rollers jointly support and drive the feed tray 62 to rotate through friction, achieving feeding and unloading. The feed port 67 is a hole opened in the internal structure of the feeder, which serves as the channel for the consumable wire 63 to enter and exit the feeder.

[0128] In the aforementioned embodiments of the present invention (such as A1 to F3), the fixing base 1 engages with the feeder cover positioning post 64 of the feeder cover 61 via its positioning fixing hole 12, achieving initial positioning. Subsequently, the fixing base 1 is finally secured to the feeder cover 61 by screwing the screw (such as an M3 self-tapping screw) of the fixing part 11 into the threaded hole in the middle of the feeder cover positioning post 64. After locking, the feeder cover 61 and the fixing base 1 are connected as a whole, providing a stable installation base for the entire pressing assembly.

[0129] Working Principle: The working principle of this feeder assembly revolves around the stable transmission of the feed tray and the reliable supply of filament. It works in conjunction with the aforementioned pressing components to ensure stable feeding throughout the entire process, from a full tray to an empty tray. Feeding and Unloading Process: When the 3D printer needs to feed filament, the external drive system drives the front 65 of the feed tray drive roller to rotate. The actively rotating front 65 of the feed tray drive roller drives the feed tray 62 to rotate through friction, thereby unwinding and feeding the coiled filament 63 from the feed tray. The rotation of the feed tray 62 simultaneously drives the rear 66 of the feed tray drive roller to rotate as a driven roller. The filament 63 is fed into the extrusion mechanism of the 3D printer through the feed / unload port 67.

[0130] When it is necessary to retract the filament (retract the filament), the drive system reverses, and the front 65 of the filament drive roller rotates in the opposite direction, thereby driving the filament to rotate in the opposite direction and retracting the filament. After the filament 62 is loaded into the feeder, its edge presses against the pressure friction component 4, causing it to move upward against the elastic force of the elastic pressure mechanism 3. The reaction force generated by the compression of the spring causes the pressure friction component 4 to apply a continuous positive pressure to the edge of the filament 62. When performing the retraction operation, the front 65 of the filament drive roller rotates in the opposite direction, causing the filament 62 to have a rewinding tendency. At this time, the constant positive pressure provided by the pressure friction component 4 will produce a significant frictional damping effect, effectively suppressing the overshoot rewinding or disordered jumping of the filament due to inertia, preventing slippage and inaccurate feeding.

[0131] As printing progresses, the material tray 62 becomes lighter due to the reduction in filament 63. Since the pressure friction assembly 4 presses against the outer edge of the tray (whose diameter remains essentially constant), the deformation of the elastic pressure mechanism 3 also remains essentially constant, thus providing constant pressure throughout the process. This constant pressure is even more crucial for suppressing bounce in the lighter tray, ensuring the reliability of the anti-slip function throughout the entire process from a full tray to an empty tray.

[0132] By adjusting the maximum downward stroke of the pressure friction component 4 set by the locking limit mechanism 5 (for example, setting it to 10mm to adapt to a tray with a diameter of 195mm, or shortening it to 5mm to adapt to a tray with a diameter of 200mm), it can be ensured that appropriate and effective pressure can be applied to trays 62 with different outer diameter specifications, thereby enhancing the versatility of the feeder.

[0133] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A 3D printing feeder anti-rewinding and slippage device based on elastic pressure adaptive design, characterized in that: Includes a fixed base (1) for mounting on the feeder cover (61) and a pressure friction assembly (4), movably connected to the fixed base (1); a guide mechanism (2) disposed between the fixed base (1) and the pressure friction assembly (4) for guiding and restricting the pressure friction assembly (4) to move in a direction substantially perpendicular to the end face of the feed tray (62); and an elastic pressure mechanism (3) disposed between the fixed base (1) and the pressure friction assembly (4) for providing pressure to the pressure friction assembly (4) towards the feed tray (62). 62) Elastic clamping force at the edge, locking and limiting mechanism (5) for limiting the maximum travel of the pressure friction assembly (4) relative to the fixed seat (1); and wear-resistant structure provided on the surface of the pressure friction assembly (4) in contact with the tray (62); wherein the guiding mechanism (2) includes at least one guide post provided on the fixed seat (1), and a guide hole (21) or a guide and limiting composite hole (2152) provided on the pressure friction assembly (4) and adapted to the shape of the guide post.

2. The anti-rewinding and slippage device for a 3D printing feeder based on elastic pressure adaptive as described in claim 1, characterized in that: The locking and limiting mechanism (5) can be implemented in one of the following ways: a. Adjusting screw, the fixed base (1) is provided with a locking engagement part (51) that cooperates with the adjusting screw, and the pressure friction assembly (4) is provided with a locking mechanism through hole (52) through which the adjusting screw passes. b. Magnetic attraction assembly, including a limiting magnet seat (53) disposed on the fixed base (1) and a limiting magnet moving block (54) disposed on the limiting mechanism. c. The elastic buckle structure includes a locking engagement part (51) with an engagement step on the fixed base (1) and an elastic buckle at the end of the limiting mechanism. The rotating buckle structure includes a locking engagement part (51) with a locking step and a rectangular through groove on the fixed base (1) and a non-elastic rectangular buckle at the end of the limiting mechanism. The elastic buckle structure for side insertion includes a through hole (51) on the side of the guide post as a locking engagement part, and a limiting mechanism (5) with an elastic buckle at one end. The elastic buckle deforms and resets after passing through the through hole, and its head and buckle body are engaged together on the inner and outer sides of the through hole to achieve locking.

3. The anti-rewinding and slippage device for a 3D printing feeder based on elastic pressure adaptive as described in claim 1, characterized in that; The elastic pressure mechanism (3) is a helical spring or a permanent magnet; when a permanent magnet is used, two magnets are respectively set on the fixed base (1) and the pressure friction assembly (4) with the same pole facing each other.

4. The anti-rewinding and slippage device for a 3D printing feeder based on elastic pressure adaptive as described in claim 1, characterized in that; The wear-resistant structure can be implemented in one of the following two ways: The pressure friction component (4) described above is itself made of wear-resistant material; or, b The wear-resistant structure is an independent and replaceable friction component (41), which is fixed to the pressure friction component (4) by welding, bonding, interference fit, threaded connection or snap-fit ​​connection.

5. The anti-rewinding and slippage device for a 3D printing feeder based on elastic pressure adaptive as described in claim 4, characterized in that; The main body shape of the replaceable friction component (41) is one of a cylindrical rod, a cuboid, or a sheet structure.

6. The anti-rewinding and slippage device for a 3D printing feeder based on elastic pressure adaptive as described in claim 1, characterized in that; The cross-sectional shape of the guide post is one of the following: circular, rectangular, cross-shaped, H-shaped, or hexagonal.

7. A 3D printing feeder anti-rewinding and slippage device based on elastic pressure adaptive according to claim 1 or 6, characterized in that; The number of guide posts can be one, two, three, or four.

8. The anti-rewinding and slippage device for a 3D printing feeder based on elastic pressure adaptive according to claim 1, characterized in that; It also includes circumferential wear-resistant rods (24); the circumferential wear-resistant rods (24) are several wear-resistant rods, which are installed in the wear-resistant rod mounting holes (25) inside the guide post by interference fit, and form a friction pair with the side of the replaceable friction assembly (41) to limit the circumferential rotation of the pressure friction assembly (4).

9. A 3D printing feeder anti-rewinding and slippage device based on elastic pressure adaptive as described in claim 1 or 8, characterized in that; The guide mechanism (2) is in direct contact with the side of the wear-resistant structure (41) to form a hard friction pair that restricts the circumferential rotation of the pressure friction assembly (4).

10. A 3D printing feeder anti-rewinding and slippage device based on elastic pressure adaptive according to claim 1 or 9, characterized in that; By replacing or adjusting the locking and limiting mechanism (5), its blocking position on the pressure friction assembly (4) can be changed, thereby adjusting the travel of the pressure friction assembly (4).

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