A FDM printing material shortage detection device

Abstract

The present application relates to the technical field of FDM printing, in particular to a kind of FDM printing material shortage and material break detection device, including print head, two parallel sides lower part position in print head are processed with step groove, stop plate is rotatably installed in step groove, top rod for extruding stop plate is penetrated in horizontal hole, the end of top rod away from stop plate outside is provided with central hole, screw rod is inserted in central hole, one end of horizontal cylinder is connected with print head, the end of screw rod away from top rod is equipped with limit ring, the side of limit ring away from top rod is equipped with adjusting nut with screw thread connection with screw rod, compression spring is arranged between limit ring and linkage arm, indicating part matched with top rod is installed on the upper position of the outer surface of horizontal cylinder, the present application realizes material shortage and material break detection by linkage of mechanical component, without circuit, sensor and other electronic components, solve the problem that traditional electronic detection equipment is easily failure by printing environment temperature, dust influence, and long-term operation component wear leads to detection failure.

Description

Technical Field

[0001] This invention relates to the field of FDM printing technology, specifically to an FDM printing material shortage detection device. Background Technology

[0002] Fused Deposition Modeling (FDM) is a common process in additive manufacturing. Its core principle involves heating thermoplastic polymer materials to a molten state using a temperature control device, then selectively depositing the molten material layer by layer along a pre-defined path. This molten material is then cooled and solidified, ultimately stacking layer by layer to form a complete three-dimensional object. In FDM printing equipment, a rectangular printhead is a widely used structural form. When the molten thermoplastic polymer material flows through this rectangular printhead under extrusion pressure, it deforms accordingly to the cross-sectional shape of the printhead, forming a material flow pattern suitable for layer-by-layer printing. This ensures the regularity of material deposition and the adhesion between layers, adapting to the printing requirements of various models.

[0003] To ensure the continuity of the printing process, the equipment is equipped with electronic detection devices such as photoelectric sensors to monitor the material delivery status inside the print head in real time and promptly detect abnormalities such as interruption or shortage of molten material. However, these electronic detection devices are affected by factors such as the temperature and dust of the printing environment, as well as wear and tear on components from long-term operation, and have a certain probability of failure. Once the electronic equipment malfunctions, it will not be able to promptly report material abnormalities in the print head, and subsequent printing processes will still continue to run according to the preset path. The lack of molten material output from the print head will directly lead to material breakage and gaps in the printed layers, not only damaging the model's molding structure and appearance accuracy, but also, in severe cases, rendering the entire printed part unusable and reducing the printing yield. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, the present invention proposes an FDM printing material shortage detection device.

[0005] The technical solution adopted by this invention to solve its technical problem is: an FDM printing material shortage detection device, including a print head, the print head having a rectangular cross-section, and stepped grooves machined at the lower part of two parallel sides inside the print head. A baffle plate is rotatably installed in the stepped groove, and the two sides of the baffle plate are in sliding contact with the two inner walls of the print head adjacent to the stepped groove. A transverse hole is opened at the lower part of the two parallel sides of the print head, and a push rod for pressing the baffle plate passes through the transverse hole. A central hole is opened at the end of the push rod away from the outer side of the baffle plate, and a screw is inserted into the central hole. A horizontal cylinder is provided outside the horizontal hole. The end of the screw away from the push rod is connected to the horizontal cylinder via a connecting rod. One end of the horizontal cylinder is connected to the print head. A guide hole is provided at the upper part of the horizontal cylinder away from the print head. The push rod passes through the guide hole. A limiting ring is fitted on the end of the screw away from the push rod. An adjusting nut threadedly connected to the screw is provided on the side of the limiting ring away from the push rod. A linkage arm is installed at the end of the push rod away from the print head. A compression spring is provided between the limiting ring and the linkage arm. The compression spring is fitted on the screw. An indicator that cooperates with the push rod is installed at the upper part of the outer surface of the horizontal cylinder. During normal feeding, the extrusion force of the molten material pushes the baffle plate to rotate against the elastic force of the compression spring, driving the push rod to move. When there is a shortage of material, the compression spring drives the push rod and the baffle plate to quickly reset. The detection action is directly driven by the molten material, with no signal transmission delay, and can trigger feedback instantly.

[0006] Meanwhile, by adjusting the deformation of the compression spring by turning the adjusting nut, the squeezing force on the baffle plate is adjusted, thereby changing the distance between the two baffle plates. This allows for flexible adjustment of the thickness of the molten material output, enabling the number of printing layers to be increased or decreased when printing products of the same height. This improves the adaptability of the printing process, eliminates the need for circuitry and sensors, and enhances the stability and durability of the detection structure.

[0007] Preferably, the indicator includes a support plate. The support plate is mounted on the end of the horizontal cylinder furthest from the print head. An indicator plate is rotatably connected to the upper end of the support plate via a rotating shaft. A power arm is mounted on the end of the indicator plate near the support plate. An elongated oval opening along the length of the power arm is opened on one side. A column head is mounted on the end of the linkage arm furthest from the push rod. The column head is slidably inserted into the elongated oval opening. A reference component that cooperates with the indicator plate is mounted on the support plate. The movement of the push rod is transmitted through the linkage arm and the column head to the elongated oval opening of the power arm, driving the indicator plate to rotate around the rotating shaft. This converts the feeding status inside the print head into a direct visual change in the position of the indicator plate. Operators can quickly determine whether the material feeding is normal by observing the indicator plate's posture, without the need for electronic auxiliary equipment. The detection results are immediately apparent. The design of the elongated oval opening is adapted to the linkage stroke of the push rod movement and the indicator plate rotation, avoiding motion interference between components and ensuring smooth linkage action.

[0008] Preferably, the reference component includes a semi-circular plate, a support arm is mounted on the upper end of the support plate, the semi-circular plate is mounted on the end of the support arm away from the support plate, the end of the indicator plate away from the power arm is in contact with the semi-circular plate, an arc-shaped groove is formed on one side of the semi-circular plate, the arc-shaped groove is concentrically arranged with the semi-circular plate, a threaded head is inserted in the arc-shaped groove, a blocking post is mounted on one end of the threaded head, a washer is provided on the side of the arc-shaped groove away from the blocking post, the washer is sleeved on the threaded head, and a clamping nut for tightly fitting the washer and the semi-circular plate is threaded onto the threaded head. When the baffle plate is in the normal feeding position under material pressure, the relative position of the indicator plate and the blocking post forms a clear normal state indicator; when there is a material shortage or interruption, the indicator plate rotates and resets with the push rod, and the blocking post and the indicator plate form a clear visual contrast, which can quickly identify material abnormalities. The arc-shaped groove design facilitates the adjustment of the position of the blocking post and the semi-circular plate, as well as the installation of two blocking posts in the arc-shaped groove.

[0009] The blocking column can slide along the arc groove of the semicircular plate and be locked in place by the clamping nut. The limit point of the indicator plate can be flexibly adjusted according to the printing head feeding pressure and the rotation stroke of the baffle plate to adapt to different detection conditions. The setting of the washer ring improves the fit between the clamping nut and the semicircular plate.

[0010] Preferably, a notch is machined at the lower part of the side of the print head perpendicular to the side of the stepped groove. The notch communicates with the stepped groove, and an end plate is provided within the notch. The two sides of the baffle plate are in sliding contact with the end plate and the inner wall adjacent to the print head and the stepped groove, respectively. Both sides of the notch are provided with connecting edges for fixing to the print head. The end plate is connected to the connecting edges by multiple sets of bolts. Because the notch communicates with the stepped groove, after removing the bolts of the end plate, the baffle plate in the stepped groove can be directly inspected, replaced, and adjusted.

[0011] Preferably, a circular groove is formed at the top of the stepped groove, and the portion of the circular groove near the stepped groove is funnel-shaped. A shaft is installed on the upper edge of the baffle plate, and the shaft is inserted into the circular groove. The shaft inserted into the circular groove provides a stable rotation fulcrum for the rotation of the baffle plate. The funnel-shaped portion of the circular groove near the stepped groove provides sufficient space for the rotation of the baffle plate, adapting to the rotational stroke of the baffle plate after being squeezed by material, and preventing the groove from interfering with the movement of the baffle plate.

[0012] Preferably, the push rod has a rectangular cross-section, the guide hole has a rectangular cross-section, and a U-shaped frame is installed at the end of the push rod near the baffle plate. A roller is rotatably installed inside the U-shaped frame. The structure formed by the roller and the U-shaped frame allows the push rod to enter and exit the horizontal cylinder through the horizontal hole, and the roller makes rolling contact with the baffle plate. Using a rectangular cross-section push rod in conjunction with the guide hole prevents rotation of the push rod during movement. Simultaneously, the U-shaped frame and roller at the end of the push rod transform the sliding contact between the push rod and the baffle plate into a rolling contact, reducing friction and wear between them and minimizing the risk of component jamming.

[0013] Preferably, a reinforcing ring is installed at the end of the horizontal cylinder near the print head, and the reinforcing ring is connected and fixed to the print head. The reinforcing ring improves the mechanical strength of the connection between the horizontal cylinder and the print head, and the horizontal cylinder increases the distance between the compression spring and the print head, allowing the hot-melt material to directly conduct heat to the compression spring and preventing the compression spring from overheating.

[0014] Preferably, a reducer is installed at the upper end of the print head, a pipe fitting is installed at the upper end of the reducer, and a flange is installed at the upper end of the pipe fitting. The flange connection allows for direct and quick connection to the feeding pipeline, and the reducer can accommodate the difference in diameter between the print head and the feeding pipeline, ensuring smooth and unobstructed transport of the molten material.

[0015] The advantages of this invention are: During normal material feeding into the printhead, the extrusion pressure of the molten material pushes the baffle plate to rotate against the spring force of the compression spring, which in turn moves the push rod. Once a material shortage occurs, the material extrusion pressure disappears, and the compression spring drives the push rod and baffle plate to quickly reset. The detection action is directly driven by the material, with no signal transmission delay. It can trigger detection feedback at the moment of material shortage. The entire process relies on the linkage of mechanical components such as the baffle plate, push rod, and compression spring to achieve material shortage detection. There is no need to lay out circuits, sensors, or other electronic components. This solves the problems of traditional electronic detection equipment being prone to failure due to the temperature and dust of the printing environment, as well as the detection failure caused by the wear and tear of components during long-term operation. The stability and durability of the detection structure are improved.

[0016] The movement of the push rod is transmitted to the indicator plate through the linkage arm and power arm, driving the indicator plate to rotate around the shaft. This converts the feeding status inside the print head into a change in the position of the indicator plate. By observing the posture of the indicator plate, the operator can intuitively judge whether there is a shortage or interruption of material in the print head. The reference structure composed of the semi-circular plate, the blocking column, etc. sets the normal working position of the indicator plate. When the baffle plate is squeezed by material, the indicator plate does not contact the blocking column, which is the normal feeding state. When there is a shortage or interruption of material, the indicator plate rotates back with the push rod and contacts the blocking column, forming a clear visual contrast, which can quickly identify abnormalities and avoid misjudgment by manual observation.

[0017] In the initial stage, the mounting position of the adjusting nut on the screw can be changed by turning it, thereby adjusting the distance between the limiting ring and the push rod, which in turn changes the initial compression deformation of the compression spring. This allows for flexible control of the extrusion pressure applied by the compression spring on the baffle plate. Under the premise that the extrusion pressure of the molten material is kept constant, the change in the extrusion pressure of the compression spring on the baffle plate will cause the opening distance between the two baffle plates to increase or decrease accordingly, thereby adjusting the thickness of the molten material exiting from the print head. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall device of the present invention; Figure 2 This is a three-dimensional schematic diagram of the overall device of the present invention from another perspective; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a plan view of the overall device of the present invention; Figure 5 for Figure 4 BB cross-sectional view.

[0020] Figure 6 This is a three-dimensional schematic diagram of the print head in the overall device of the present invention; Figure 7 for Figure 6 Enlarged view at point C; Figure 8 This is an exploded structural diagram of the cross cylinder, compression spring, top rod, screw, semicircular plate, indicator plate, and semicircular plate in this invention. Figure 9 This is an exploded structural diagram of the blocking post, threaded head, washer ring, and clamping nut in this invention; In the diagram: 100, print head; 101, reducer; 1011, pipe fitting; 1012, flange; 102, stepped groove; 1021, circular groove; 103, horizontal hole; 200, semi-circular plate; 201, indicator plate; 2011, power arm; 2012, oblong opening; 202, stop post; 2021, washer; 2022, clamping nut; 2023, threaded head; 203, arc-shaped groove; 204. Support plate; 205, support arm; 206, linkage arm; 2061, column head; 300, cross cylinder; 301, reinforcing ring; 302, guide hole; 400, end plate; 401, connecting edge; 500, screw; 501, limit ring; 502, compression spring; 503, adjusting nut; 504, top rod; 505, connecting rod; 600, roller; 601, U-shaped frame; 700, baffle plate; 701, shaft. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail. This application discloses an FDM printing material shortage detection device: Reference Figures 1-9 An FDM printing material shortage detection device includes a printhead 100 with a rectangular cross-section. A reducer 101 is mounted on the upper end of the printhead 100, and a pipe connector 1011 is mounted on the upper end of the reducer 101. A flange 1012 is mounted on the upper end of the pipe connector 1011. The pipe connector 1011 is connected to the outlet of a screw extruder via the flange 1012. Molten material enters the printhead 100 through the extrusion of the screw extruder. Stepped grooves 102 are machined on the lower part of two parallel sides inside the printhead 100. A circular groove 1021 is formed at the top of the stepped groove 102, and the portion of the circular groove 1021 near the stepped groove 102 is flared. A shaft 701 is mounted on the upper edge of a baffle plate 700, which is inserted into the circular groove 1021, allowing the baffle plate 700 to be rotatably mounted within the stepped groove 102.

[0023] A notch is machined at the lower part of the side of the print head 100 perpendicular to the side of the stepped groove 102, and the notch communicates with the stepped groove 102. An end plate 400 is provided inside the notch, and the two sides of the baffle plate 700 slide in contact with the end plate 400 and the inner wall adjacent to the print head 100 and the stepped groove 102, respectively. Both sides of the notch are provided with connecting edges 401 that are fixed to the print head 100, and the end plate 400 is connected to the connecting edges 401 by multiple sets of bolts. The notch communicates with the stepped groove 102, and after removing the bolts of the end plate 400, the baffle plate 700 in the stepped groove 102 can be directly inspected, replaced, and adjusted.

[0024] The print head 100 has horizontal holes 103 on the lower part of its two parallel sides. A push rod 504 for pressing the baffle plate 700 passes through each horizontal hole 103. Both the push rod 504 and the guide hole 302 have rectangular cross-sections. A U-shaped frame 601 is installed at the end of the push rod 504 near the baffle plate 700. A roller 600 is rotatably mounted inside the U-shaped frame 601. The structure formed by the roller 600 and the U-shaped frame 601 allows the roller to enter and exit the horizontal cylinder 300 through the horizontal holes 103. The rectangular cross-section of the push rod 504, in conjunction with the guide hole 302, prevents the push rod 504 from rotating during movement, ensuring rolling contact between the roller 600 and the baffle plate 700. This transforms the sliding contact between the push rod 504 and the baffle plate 700 into rolling contact, reducing friction and wear between them.

[0025] A central hole is provided at the end of the push rod 504 furthest from the baffle plate 700, into which a screw 500 is inserted. This allows for relative displacement between the screw 500 and the push rod 504. A horizontal cylinder 300 is provided outside the horizontal hole 103, connecting the end of the screw 500 furthest from the push rod 504 to the horizontal cylinder 300 via a connecting rod 505. This helps maintain the relative position of the screw 500 and the horizontal cylinder 300. One end of the horizontal cylinder 300 is connected to the print head 100. A reinforcing ring 301 is installed at the end of the horizontal cylinder 300 closest to the print head 100, and is fixedly connected to the print head 100. The reinforcing ring 301 increases the mechanical strength of the connection between the horizontal cylinder 300 and the print head 100. The horizontal cylinder 300 also increases the distance between the compression spring 502 and the print head 100, preventing the hot-melt material from directly conducting heat to the compression spring 502 and preventing overheating of the compression spring 502.

[0026] A guide hole 302 is provided at the upper end of the horizontal cylinder 300 away from the print head 100, and the push rod 504 passes through the guide hole 302; a limiting ring 501 is sleeved at the end of the screw 500 away from the push rod 504, and an adjusting nut 503 threadedly connected to the screw 500 is provided on the side of the limiting ring 501 away from the push rod 504; a linkage arm 206 is installed at the end of the push rod 504 away from the print head 100, and a compression spring 502 is provided between the limiting ring 501 and the linkage arm 206, and the compression spring 502 is sleeved on the screw 500.

[0027] In the initial state, adjusting the position of the adjusting nut 503 on the screw 500 changes the distance between the limiting ring 501 and the push rod 504, thereby changing the deformation of the compression spring 502 in the initial state. That is, the magnitude of the extrusion force of the compression spring 502 on the baffle plate 700 can be adjusted as needed. Under a constant molten material conveying pressure, the width of the distance between the two baffle plates 700, supported by the compression spring 502, increases or decreases, thereby adjusting the thickness of the molten material when it is discharged, and increasing or decreasing the number of printing layers when printing products of the same height.

[0028] A support plate 204 is installed at the end of the horizontal cylinder 300 away from the print head 100. An indicator plate 201 is rotatably connected to the upper end of the support plate 204 via a rotating shaft. A power arm 2011 is installed at the end of the indicator plate 201 near the support plate 204. An elongated oval opening 2012 is opened on one side of the power arm 2011 along the length of the power arm 2011. A column head 2061 is installed at the end of the linkage arm 206 away from the top rod 504. The column head 2061 is slidably inserted into the elongated oval opening 2012.

[0029] When the print head 100 is feeding normally, the extrusion pressure of the molten material will push the baffle plate 700 to rotate, so that it overcomes the elastic force of the compression spring 502, and then synchronously drives the push rod 504 to move. Once a material shortage or interruption occurs, the extrusion pressure of the material will disappear, and the compression spring 502 will drive the push rod 504 and the baffle plate 700 to quickly reset.

[0030] The entire detection process is directly driven by the extrusion pressure of the molten material, without any signal transmission links. It can trigger detection feedback instantly when there is a shortage or interruption of material. The entire process relies on the linkage of mechanical components such as the baffle plate 700, the push rod 504, and the compression spring 502. There is no need to lay out any circuits, sensors, or other electronic components. This solves the problems of traditional electronic detection equipment being easily affected by the temperature and dust of the printing environment, as well as the problem of component wear and failure due to long-term operation, thus improving the operational stability and overall durability of the detection structure.

[0031] A support arm 205 is installed on the upper end of the support plate 204. A semicircular plate 200 is installed on the end of the support arm 205 away from the support plate 204. The end of the indicator plate 201 away from the power arm 2011 is in contact with the semicircular plate 200. An arc-shaped groove 203 is opened on one side of the semicircular plate 200. The arc-shaped groove 203 is arranged concentrically with the semicircular plate 200. A threaded head 2023 is inserted in the arc-shaped groove 203. A blocking post 202 is installed on one end of the threaded head 2023. A washer ring 2021 is provided on the side of the arc-shaped groove 203 away from the blocking post 202. The washer ring 2021 is sleeved on the threaded head 2023. A clamping nut 2022 is threadedly connected to the threaded head 2023 to make the washer ring 2021 fit tightly with the semicircular plate 200.

[0032] The movement of the push rod 504 is transmitted to the indicator plate 201 through the linkage arm 206 and the power arm 2011, driving the indicator plate 201 to rotate around the pivot, thus converting the feeding state in the print head 100 into a change in the position of the indicator plate 201. The operator can visually judge whether there is a shortage or interruption of material in the print head 100 by observing the posture of the indicator plate 201. The reference structure composed of the semi-circular plate 200, the blocking column 202, etc. sets the normal working position of the indicator plate 201. When the baffle plate 700 is squeezed by material, the indicator plate 201 does not contact the blocking column 202, which is the normal feeding state. When there is a shortage or interruption of material, the indicator plate 201 rotates and resets with the push rod 504 and contacts the blocking column 202, forming a clear visual contrast, which can quickly identify abnormalities and avoid misjudgment by manual observation.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An FDM printing material shortage detection device, comprising a printhead (100), characterized in that: The print head (100) has a rectangular cross-section. Stepped grooves (102) are machined on the lower parts of two parallel sides inside the print head (100). A baffle plate (700) is rotatably installed inside the stepped groove (102). The two sides of the baffle plate (700) slide in contact with the two adjacent inner walls of the print head (100) and the stepped groove (102), respectively. A transverse hole (103) is opened on the lower parts of the two parallel sides of the print head (100). A push rod (504) for pressing the baffle plate (700) passes through the transverse hole (103). A central hole is opened at the end of the push rod (504) away from the outer side of the baffle plate (700). A screw (500) is inserted into the central hole. A transverse cylinder (300) is provided outside the transverse hole (103). The end of the screw (500) away from the push rod (504) is connected to the transverse cylinder via a connecting rod (505). (300) are connected together. One end of the horizontal cylinder (300) is connected to the print head (100). A guide hole (302) is provided at the end of the horizontal cylinder (300) away from the print head (100). The top rod (504) passes through the guide hole (302). A limiting ring (501) is sleeved at the end of the screw (500) away from the top rod (504). An adjusting nut (503) that is threadedly connected to the screw (500) is provided on the side of the limiting ring (501) away from the top rod (504). A linkage arm (206) is installed at the end of the top rod (504) away from the print head (100). A compression spring (502) is provided between the limiting ring (501) and the linkage arm (206). The compression spring (502) is sleeved on the screw (500). An indicator that cooperates with the top rod (504) is installed at the upper part of the outer surface of the horizontal cylinder (300). The indicator includes a support plate (204). The support plate (204) is installed at the upper end of the horizontal cylinder (300) away from the print head (100). The upper end of the support plate (204) is rotatably connected to an indicator plate (201) via a rotating shaft. A power arm (2011) is installed at the end of the indicator plate (201) near the support plate (204). An elongated oval opening (2012) is opened on one side of the power arm (2011) along the length direction of the power arm (2011). A column head (2061) is installed at the end of the linkage arm (206) away from the top rod (504). The column head (2061) is slidably inserted into the elongated oval opening (2012). A reference component that cooperates with the indicator plate (201) is installed on the support plate (204). The reference component includes a semicircular plate (200), a support arm (205) is mounted on the upper end of the support plate (204), the semicircular plate (200) is mounted on the end of the support arm (205) away from the support plate (204), the end of the indicator plate (201) away from the power arm (2011) is in contact with the semicircular plate (200), and an arc-shaped groove (203) is provided on one side of the semicircular plate (200), the arc-shaped groove (203) is arranged concentrically with the semicircular plate (200). A threaded head (2023) is inserted into the arc-shaped groove (203). A blocking post (202) is installed at one end of the threaded head (2023). A washer (2021) is provided on the side of the arc-shaped groove (203) away from the blocking post (202). The washer (2021) is sleeved on the threaded head (2023). A clamping nut (2022) is threaded on the threaded head (2023) to make the washer (2021) fit tightly with the semi-circular plate (200).

2. The FDM printing material shortage detection device according to claim 1, characterized in that: A notch is machined at the lower part of the side of the print head (100) perpendicular to the side of the stepped groove (102). The notch communicates with the stepped groove (102). An end plate (400) is provided in the notch. The two sides of the baffle plate (700) slide in contact with the end plate (400), the inner wall of the print head (100) and the stepped groove (102) respectively. Both sides of the notch are provided with connecting edges (401) that are fixed to the print head (100). The end plate (400) is connected to the connecting edges (401) by multiple sets of bolts.

3. The FDM printing material shortage detection device according to claim 2, characterized in that: A circular groove (1021) is provided at the top of the stepped groove (102). The part of the circular groove (1021) near the stepped groove (102) is flared. A shaft (701) is installed on the upper edge of the baffle plate (700). The shaft (701) is inserted into the circular groove (1021).

4. The FDM printing material shortage detection device according to claim 1 or 3, characterized in that: The top rod (504) has a rectangular cross-section, the guide hole (302) has a rectangular cross-section, and a U-shaped frame (601) is installed at one end of the top rod (504) near the baffle plate (700). A roller (600) is rotatably installed inside the U-shaped frame (601). The structure formed by the roller (600) and the U-shaped frame (601) can enter and exit the horizontal cylinder (300) through the horizontal hole (103). The roller (600) is in rolling contact with the baffle plate (700).

5. The FDM printing material shortage detection device according to claim 4, characterized in that: A reinforcing ring (301) is installed at one end of the horizontal cylinder (300) near the print head (100), and the reinforcing ring (301) is connected and fixed to the print head (100).

6. The FDM printing material shortage detection device according to claim 1, characterized in that: A reducer (101) is installed on the upper end of the print head (100), a pipe fitting (1011) is installed on the upper end of the reducer (101), and a flange (1012) is installed on the upper end of the pipe fitting (1011).

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