Material line resistance detection device, three-dimensional printer print head and three-dimensional printer

Abstract

The present application provides a material line resistance detection device, a 3D printer print head and a 3D printer, including: an extrusion assembly is provided with an extrusion mechanism to drive the material line to be transmitted to the hot end; a feeding assembly is provided with a feeding channel, a feed port of the feeding channel receives the material line from the feeding device, and a discharge port of the feeding channel faces the extrusion assembly, and the extrusion assembly can move relative to the feeding assembly along the direction of the material line in the feeding channel; one end of the elastic element is connected to the extrusion assembly, and the other end is connected to the feeding assembly to prevent the extrusion assembly and the feeding assembly from approaching each other in the direction of the material line in the feeding channel; a trigger element is provided in one of the extrusion assembly or the feeding assembly; a detection element is provided in the other of the extrusion assembly or the feeding assembly, and the relative distance between the extrusion assembly and the feeding assembly is detected by detecting the relative distance with the trigger element. The present application can detect the material line resistance and avoid printing defects or failures.

Description

Technical Field

[0001] The present application relates to the technical field of printer accessories, and in particular to a material line resistance detection device, a three-dimensional printer print head and a three-dimensional printer. Background Art

[0002] FDM (fused deposition modeling) 3D printing is a technology that uses powdered metal or plastic materials to construct three-dimensional objects by printing layer by layer based on digital models. In specific implementation, a 3D printer using FDM technology uses a feeding mechanism to supply the device's hot-melt filamentary material to the hot end, and the hot-melt filamentary material is heated to a molten state in the hot end. The hot end can then extrude the molten material onto the print panel while moving along the printing path of the 3D printer, printing out a 3D object layer by layer.

[0003] During the printing process, due to various reasons, the material line resistance may sometimes increase. When the material line resistance increases to a certain extent, it will cause problems such as insufficient extrusion and slippage of the extruder wheel, affecting the final printing results or causing printing failure. Summary of the invention

[0004] In view of the above problems, the present application is proposed to provide a material line resistance detection device, a 3D printer print head and a 3D printer that overcome the above problems or at least partially solve the above problems.

[0005] In a first aspect of the present application, the present application discloses a material line resistance detection device, comprising:

[0006] An extrusion assembly is provided with an extrusion mechanism, and the extrusion mechanism is used to drive the material line to be transmitted to the hot end;

[0007] A feeding assembly is provided with a feeding channel, wherein the feeding port of the feeding channel is used to receive the material line from the feeding device, and the discharge port of the feeding channel faces the extrusion assembly, and the extrusion assembly can move relative to the feeding assembly along the direction of the material line in the feeding channel;

[0008] An elastic element, one end of which is connected to the extrusion assembly, and the other end of which is connected to the feeding assembly, for preventing the extrusion assembly and the feeding assembly from approaching each other in the direction of the material line in the feeding channel;

[0009] A trigger element, disposed in one of the extrusion assembly or the feeding assembly;

[0010] A detection element is arranged in the other one of the extrusion component or the feeding component, and is used to detect the relative distance or the change of the relative distance between the extrusion component and the feeding component by detecting the relative distance or the change of the relative distance with the trigger element.

[0011] Optionally, the feeding device is provided with a feeding tray.

[0012] Optionally, the material line of the material tray is sent out from the feeding port of the feeding device to the feeding port of the feeding channel, and a material line pipe is provided between the feeding port of the feeding device and the feeding port of the feeding channel, so that the length of the material line between the feeding port of the feeding device and the feeding port of the feeding channel is the length of the material line pipe.

[0013] Optionally, the extrusion assembly is provided with a containing cavity, and the discharge port of the feeding assembly is sleeved in the containing cavity.

[0014] Optionally, a slide groove is provided in the accommodating cavity, and the slide groove is used to guide the direction of relative movement between the extrusion component and the feeding component.

[0015] Optionally, the slide groove is an elongated hole, the trigger element is arranged on a protrusion on the outer side of the feeding component, the protrusion protrudes into the slide groove, and the detection element is arranged on the elongated hole.

[0016] Optionally, the discharge port of the feeding assembly is cylindrical, and the elastic element comprises a spring, one end of the spring is sleeved on the discharge port, and the other end is in contact with the extrusion assembly.

[0017] Optionally, the trigger element includes a magnetic element;

[0018] Correspondingly, the detection element includes a Hall sensor for detecting the distance from the magnetic element.

[0019] Optionally, the trigger element comprises a protrusion;

[0020] Correspondingly, the detection module includes at least one travel switch, and when the relative distance between the extrusion component and the feeding component is a preset value, the protrusion touches and triggers the travel switch.

[0021] In a second aspect of the present application, the present application discloses a 3D printer print head, comprising: the above-mentioned material line resistance detection device, and a hot end,

[0022] The extrusion mechanism of the material line resistance detection device is used to drive the material line to be transmitted to the hot end of the printer;

[0023] The feeding assembly of the material line resistance detection device is used to receive the material line from the feeding device;

[0024] The hot end is used to heat the material line in the hot end to a molten state;

[0025] The hot end is also used to extrude the molten material line to print a three-dimensional model.

[0026] In the third aspect of the present application, the present application discloses a three-dimensional printer, comprising: a printing platform, a driving device and the three-dimensional printer print head as described above, wherein the three-dimensional printer print head is arranged above the printing platform, and the driving device is used to drive the three-dimensional printer print head to generate relative displacement with the printing platform.

[0027] This application includes the following advantages:

[0028] When the resistance of the material line increases, the resistance can drive the feeding assembly to move toward the extrusion assembly along the direction of the material line in the feeding channel. The present application can detect the change in the relative distance between the extrusion assembly and the feeding assembly, thereby determining whether the resistance of the material line increases. In addition, due to the presence of the elastic element, the greater the change in relative distance, the greater the resistance, so the magnitude of the resistance can be determined to avoid printing defects or failures. Furthermore, the reduction in the relative distance between the extrusion assembly and the feeding assembly caused by excessive resistance can buffer the impact caused by excessive resistance, providing time for timely response during high-speed printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a material line resistance detection device of the present application;

[0030] Figure 2 It is a schematic diagram of the structure of a print head of a three-dimensional printer of the present application;

[0031] Figure 3 It is a structural schematic diagram of a three-dimensional printer of the present application.

[0032] Among them, 100-extrusion assembly, 110-extrusion mechanism, 120-accommodation chamber, 200-feeding assembly, 210-feeding channel, 300-elastic element, 400-trigger element, 500-detection element, 600-feeding line tube, 700-feeding port of the feeding device;

[0033] 800- material line resistance detection device, 900- hot end;

[0034] 1-3D printer print head, 11-material guide unit, 12-hot end, 13-first guide rail, 14-second guide rail, 15-third guide rail, 3-printing platform, 31-printing panel, 32-hot bed, 33-base, 4-feeding device. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Reference Figure 1 , shows a schematic structural diagram of a material line resistance detection device of the present application, and the material line resistance detection device may specifically include the following components:

[0037] The extrusion assembly 100 is provided with an extrusion mechanism 110, and the extrusion mechanism 110 is used to drive the material line to the hot end. Among them, the heating block on the hot end can heat the line material, and the hot end is extruded to print a three-dimensional model.

[0038] The feeding assembly 200 is provided with a feeding channel 210, the feeding port of the feeding channel 210 is used to receive the material line from the feeding device, the discharge port of the feeding channel 210 faces the extrusion assembly 100, and the extrusion assembly 100 can move relative to the feeding assembly 200 along the direction of the material line in the feeding channel 210. The material line of the feeding device is transported from the feeding port 700 of the feeding device to the feeding port of the feeding channel 210.

[0039] The feeding channel 210 has at least one feeding port and one discharging port, that is, the feeding channel 210 can be a feeding channel 210 for a single-wire material, or a feeding channel 210 for multiple-wire materials.

[0040] An elastic element 300, one end of which is connected to the extrusion assembly 100 and the other end of which is connected to the feeding assembly 200, is used to prevent the extrusion assembly 100 and the feeding assembly 200 from approaching each other in the direction of the material line in the feeding channel 210. The elastic element 300 can be arranged between the extrusion assembly 100 and the feeding assembly 200.

[0041] The trigger element 400 is disposed in one of the extrusion assembly 100 or the feeding assembly 200 .

[0042] The detection element 500 is disposed in the other one of the extrusion assembly 100 or the feeding assembly 200 , and is used to detect the relative distance or the change of the relative distance between the extrusion assembly 100 and the feeding assembly 200 by detecting the relative distance to the trigger element 400 .

[0043] For example, the trigger element 400 is disposed on the extrusion assembly 100, and the detection element 500 is disposed on the feeding assembly 200. The trigger element 400 and the detection element 500 are parts disposed in pairs.

[0044] The material line is usually wound around a material tray, stacked layer by layer, and the tail end of the material line is fixed on the material tray. If the material line slips out of the material tray during printing, or the tail of the material line cannot be loosened because it is fixed on the material tray after it is used up, it will cause the material line resistance to increase or the material line to get stuck. When the line material resistance is too large, the extrusion component 100 and the feeding component 200 can move between them, and the size of the line material resistance can be determined by the relative distance between the extrusion component 100 and the feeding component 200.

[0045] In an optional implementation of the present application, the feeding device has a feeding tray.

[0046] In the present application, a feeding device is provided with a material tray on which wire material is wound.

[0047] In an optional implementation of the present application, the material line of the material tray is sent out from the feeding port of the feeding device to the feeding port of the feeding channel 210, and a material line pipe 600 is provided between the feeding port of the feeding device and the feeding port of the feeding channel 210, so that the material line length between the feeding port of the feeding device and the feeding port of the feeding channel 210 is the length of the material line pipe 600.

[0048] By setting the material line tube 600, the material delivered from the feeding port of the feeding device to the feeding port of the feeding channel 210 is guided by the material line tube 600. When the resistance of the material increases, a force that shortens the distance between the material tray and the extrusion assembly 100 will be generated. Since the length of the material line tube 600 remains unchanged, the feeding assembly 200 will approach the extrusion assembly 100, so that the relative distance between the feeding assembly 200 and the extrusion assembly 100 changes. Therefore, the increase in the resistance of the material can be determined based on the shortening of the relative distance between the feeding assembly 200 and the extrusion assembly 100. In addition, due to the presence of the elastic element 300, the greater the change in the relative distance between the feeding assembly 200 and the extrusion assembly 100, the greater the resistance, so the magnitude of the resistance can be determined. Furthermore, the reduction in the relative distance between the extrusion assembly and the feeding assembly caused by the excessive resistance can buffer the impact caused by the excessive resistance, providing time for timely response during high-speed printing.

[0049] In an optional implementation of the present application, the extrusion assembly 100 is provided with a containing cavity 120 , and the discharge port of the feeding assembly 200 is sleeved in the containing cavity 120 .

[0050] The extrusion assembly 100 is provided with a receiving chamber 120 inside. The receiving chamber 120 may be an open receiving chamber 120. Figure 1 As shown, there is no top surface above the accommodating chamber 120. The discharge port of the feeding assembly 200 is sleeved in the accommodating chamber 120. This structure can stabilize the spatial relationship between the feeding assembly 200 and the extrusion assembly 100.

[0051] In an optional implementation of the present application, a slide groove is provided in the accommodating cavity 120 , and the slide groove is used to guide the direction of relative movement between the extrusion assembly 100 and the feeding assembly 200 .

[0052] A slide groove is provided inside the accommodating cavity 120, and the protrusion on the outer side surface of the feeding component 200 can be slidably connected in the slide groove. When the extrusion component 100 and the feeding component 200 move relative to each other, the direction of the relative movement of the two is guided to avoid movement misalignment of the extrusion component 100 and the feeding component 200.

[0053] Specifically, the chute is an elongated hole, the trigger element 400 is arranged on a protrusion on the outer side of the feeding assembly 200, and the protrusion protrudes into the chute so as to be slidably connected to the chute. The detection element 500 can be arranged on the elongated hole. The chute is an opening connected to the outside of the accommodating cavity for detection by the detection element 500.

[0054] The chute is an elongated hole, and the feeding assembly 200 moves along the axial direction of the chute. The trigger element 400 can be arranged on a protrusion on the outer side of the feeding assembly 200, and the protrusion protrudes into the chute. The detection element 500 is arranged on the elongated hole, so that when the feeding assembly 200 and the extrusion assembly 100 move relative to each other, the detection element 500 can directly detect the relative distance between the trigger element 400 and the extrusion assembly 100.

[0055] In addition, a stopper may be provided on the accommodating chamber 120 of the extrusion assembly 100 to limit the sliding position of the feeding assembly 200 when it moves away from the extrusion assembly 100, thereby preventing the feeding assembly 200 from escaping from the accommodating chamber 120. The stopper may be an inclined surface in contact with the feeding assembly 200.

[0056] The limiting member may also be a cover with a through hole in the accommodating chamber 120, and the cover may be snap-connected to the accommodating chamber 120, and the middle of the discharge port of the feeding assembly 200 may pass through the through hole, but the discharge port of the feeding assembly 200 has a protrusion at one end close to the extrusion assembly 100, so that the discharge port cannot be separated from the through hole of the cover. Specifically, the discharge port has a protrusion on one side close to the end of the extrusion assembly 100, and the through hole of the cover has an opening for the protrusion to pass through, so that when the discharge port is rotated to a first angle relative to the cover, the protrusion and the opening can be aligned, so that the discharge port can be separated from the through hole, but when the discharge port is rotated to a second angle relative to the cover, the discharge port cannot be separated from the through hole of the cover. In addition, when the cover is snap-connected to the accommodating chamber 120, the inner wall of the accommodating chamber can limit the protrusion so that the protrusion cannot be aligned with the opening, that is, the discharge port cannot be rotated to the first angle relative to the cover, but is limited to the second angle.

[0057] In an optional implementation of the present application, Figure 1 As shown, the discharge port of the feeding assembly 200 is cylindrical, and the elastic element 300 includes a spring, one end of which is sleeved on the discharge port, and the other end of which is in contact with the extrusion assembly 100 .

[0058] like Figure 1 As shown, the elastic element 300 can be, for example, a cylindrical helical spring. Specifically, an annular protrusion matching the size of the spring can be provided in the extrusion assembly 100, and the spring can abut against the inside of the annular protrusion or the outside of the annular protrusion. Specifically, the annular protrusion can also form a groove with the inner wall of the accommodating cavity 120 to accommodate the other end of the spring.

[0059] When there is no resistance or little resistance to the material line, the spring, based on its own elastic force, presses against the feeding assembly 200 in the accommodating chamber 120, so that the feeding assembly 200 will not slide down due to its own gravity, and relative movement with the extrusion assembly 100 will occur, affecting the detection result. When the material line is subject to resistance or the resistance is too large, the relative movement of the feeding assembly 200 and the extrusion assembly 100 will compress the spring, and when the material line resistance is eliminated, the spring will reset the feeding assembly 200 and the extrusion assembly 100 based on the elastic force generated by the compression, so that after the abnormal resistance of the material line is eliminated, the feeding assembly 200 and the extrusion assembly 100 are automatically reset. In addition, due to the existence of the spring, the smaller the relative distance, the greater the resistance, so the size of the resistance can be determined, so that the resistance can be detected in advance before it affects the printing and an early warning is given, thereby avoiding the impact on the printing quality. Moreover, once abnormal resistance occurs, the relative movement between the feeding assembly 200 and the extrusion assembly 100 allows the material line between the feeding assembly 200 and the extrusion assembly 100 to be temporarily used for printing, thereby providing time for timely response during high-speed printing, so as to make timely response or related processing, such as pausing printing and informing the user.

[0060] In an optional implementation of the present application, the extrusion mechanism 110 includes a first extrusion wheel and a second extrusion wheel that are symmetrically arranged based on the material line, and the first extrusion wheel and the second extrusion wheel jointly extrude the material line.

[0061] In the present application, the extrusion mechanism 110 may include a first extrusion wheel and a second extrusion wheel. The first extrusion wheel and the second extrusion wheel are symmetrically arranged relative to the material line. The first extrusion wheel and the second extrusion wheel jointly extrude the material line; that is, both sides of the material line are extruded, so that the material line is pulled evenly, the movement of the material line is smoother, the detection interference of the material line resistance is smaller, and the result is more accurate. In addition, the gap between the first extrusion wheel and the second extrusion wheel can be slightly smaller than the width of the material line, so that the material line can be conveyed based on friction.

[0062] In an optional implementation of the present application, the trigger element 400 includes a magnetic element;

[0063] Correspondingly, the detection element 500 includes a Hall sensor for detecting the distance from the magnetic element.

[0064] The trigger element 400 can be, for example, a magnet. The magnetic element is embedded in the feeding component 200, that is, fixed in the feeding component 200. Correspondingly, the detection element 500 includes a Hall sensor. Based on the Hall principle, when the magnetic element approaches the Hall detection circuit in the Hall sensor, the magnetic field changes, and the output voltage of the Hall detection circuit changes accordingly, that is, the relative distance between the magnetic element and the magnetic element can be determined by the output voltage of the Hall detection circuit, and then the wire resistance can be determined. The magnetic element can be arranged on a protrusion on the outer side of the feeding component 200, and the protrusion protrudes into a slide groove opened on the outer wall of the extrusion component 100 so as to be slidably connected to the slide groove. The Hall sensor can be arranged outside the slide groove. The magnetic element can also be embedded in the feeding channel 210. In order to enable those skilled in the art to clarify the detection process of the present application, refer to Figure 1 , taking the Hall sensor as the detection element 500 and the magnetic element as the trigger element 400 as an example for explanation:

[0065] When the 3D printer is working normally, the extrusion assembly 100 pulls the material line to move. If the material line resistance is zero or very small, the spring will prevent the relative movement of the feeding assembly 200 and the extrusion assembly 100. The feeding assembly 200 is located above the accommodating cavity 120. At this time, the Hall sensor will detect that the relative distance of the trigger element 400 is the longest.

[0066] When the resistance of the material line becomes larger or too large, as the extrusion mechanism 110 moves the material line downward, the length of the material line between the material tray or the feeding device and the extrusion assembly 100 will become shorter, and the feeding assembly 200 will move downward accordingly, compressing the elastic element 300, and the magnetic element moves with the feeding assembly 200. The position of the magnetic element is detected in the Hall sensor, and the distance between it and the magnetic element is obtained, and then the resistance of the material line is calculated. When the resistance of the material line is different, the elastic element 300 is compressed to different lengths, and the corresponding trigger element 400 has different positions, and the distance between the trigger element 400 and the Hall sensor is different. Therefore, the resistance of the material line can be detected according to the position of the trigger element 400 to the detection magnetic element. When the resistance is too large, the printing can be suspended in time, the abnormal cause can be checked, the material line can be cut off and returned, and then the user is prompted that the resistance of the material line is too large, and printing can be continued after returning to normal.

[0067] In an optional implementation of the present application, the trigger element 400 includes a protrusion (not shown in the figure),

[0068] Correspondingly, the detection element 500 includes at least one travel switch (not shown in the figure), and when the relative distance between the extrusion assembly 100 and the feeding assembly 200 is a preset value, the protrusion touches and triggers the travel switch. In other words, the protrusion moves with the feeding assembly 200 and touches the travel switch when the feeding assembly 200 moves toward the extrusion assembly 100.

[0069] In practical applications, a travel switch can be used as the detection element 500, and resistance detection is performed based on the detection method of different resistance values ​​corresponding to the moving position. The trigger element 400 includes a protrusion, which is arranged on the side of the feeding component 200 facing the accommodating cavity 120 or on the bottom of the extrusion mechanism 110, that is, it can contact the travel switch during the sliding process of the feeding component 200. The number of travel switches is at least one, and the travel switch can be arranged on the inner side of the accommodating cavity 120, and along the extrusion component 100 and the feeding component 200 in the direction of the material line in the feeding channel 210. When there are multiple travel switches, they can be distributed at equal intervals or at variable intervals, and this application does not make specific restrictions on this. When the feeding component 200 and the extrusion component 100 move relative to each other, when the protrusion touches the travel switch corresponding to different resistances (the corresponding resistance is different when the travel switch position is different), the relative distance between the extrusion component 100 and the feeding component 200 is the corresponding preset value, that is, the material line resistance reaches the corresponding resistance value.

[0070] In an optional implementation of the present application, the displacement between the extrusion assembly 100 and the feeding assembly 200 may also be detected by a grating sensor.

[0071] In an optional implementation of the present application, the trigger element 400 includes a metal element; correspondingly, the detection element 500 includes an eddy current coil for detecting the distance to the metal element.

[0072] The metal element can be arranged on a protrusion on the outer side of the feeding assembly 200, and the protrusion protrudes into a chute opened on the outer wall of the extrusion assembly 100 so as to be slidably connected to the chute. The eddy current coil can be arranged outside the chute. The metal element can also be embedded in the feeding channel 210.

[0073] In an optional implementation of the present application, the detection element 500 includes: a force sensor (not shown in the figure), and the elastic element 300 may not be set. The trigger element 400 is a protrusion. Accordingly, the positional relationship between the extrusion component 100 and the feeding component 200 can be fixed, and the two are abutted against each other through the protrusion and the force sensor. When the resistance increases or is too large, the extrusion component 100 generates pressure to the force sensor on the feeding component through the protrusion to indicate the resistance encountered by the material line.

[0074] In an optional implementation of the present application, the detection element 500 includes: a force sensor (not shown in the figure), and the trigger element 400 may not be provided, and the elastic element 300 abuts against the force sensor. The resistance is detected by detecting the elastic force of the spring.

[0075] The types of the force sensor include, but are not limited to, strain tube type, diaphragm type, and strain beam type, which are not limited in the present application.

[0076] Reference Figure 2 , showing a schematic structural diagram of a 3D printer print head of the present application; the 3D printer print head includes the material line resistance detection device 800 and the hot end 900 as described above,

[0077] The extrusion mechanism of the material line resistance detection device 800 is used to drive the material line to be transmitted to the hot end 900.

[0078] The feeding assembly of the material line resistance detection device 800 is used to receive the material line from the feeding device.

[0079] The hot end 900 is used to heat the material line in the hot end 900 to a molten state, and is also used to extrude the molten material line to print a three-dimensional model.

[0080] Reference Figure 3 , showing a structural diagram of a 3D printer of the present application. The 3D printer comprises: a printing platform 3, a driving device and the above-mentioned 3D printer print head 1, wherein the 3D printer print head 1 is arranged above the printing platform 3, and the driving device is used to drive the 3D printer print head 1 to generate relative displacement with the printing platform 3.

[0081] The 3D printer print head 1 is arranged above the printing platform 3, and is used to extrude the printing material that is heated and melted into a molten state; the feeding device 4 is connected to the feeding end of the 3D printer print head 1 (which can be the feeding port of the feeding channel) to provide a material line for the 3D printer print head 1, and the driving device drives the 3D printer print head 1 to produce relative displacement between the printing platforms 3, so as to print or construct a 3D model.

[0082] The 3D printer print head 1 includes a material guide unit 11 (which may be a material feeder assembly in the present application), a hot end 12 (which may be a hot end 900 in the present application), and an extrusion assembly disposed between the material guide unit 11 and the hot end 12. During the feeding process of the material feeder 4, the printing material passes through the material guide unit 11 and then enters the extrusion assembly, and the extrusion assembly provides the printing material to the hot end 12; during the material return process of the material feeder 4, the 3D printer cuts off the printing material in the 3D printer print head 1, and the extrusion assembly returns the printing material to the material feeder 4, and the loading and unloading assemblies in the material feeder 4 rewind the returned printing material to the material tray.

[0083] Optionally, the 3D printer may, for example, cut off the printing material between the extrusion component and the printer hot end 12 or may cut off the printing material in the extrusion component, etc. The present application does not limit the position where the 3D printer cuts off the printing material.

[0084] Exemplarily, the 3D printer further includes a printing panel 31, a heat bed 32 and a base 33. The heat bed 32 is disposed on the side of the base 33 facing the hot end 12, and the heat bed 32 has a heating function. The printing panel 31 is disposed on the side of the heat bed 32 facing the hot end 12, and the heat of the heat bed 32 can be transferred to the printing panel 31, and the hot end 12 can extrude the molten printing material onto the printing panel 31.

[0085] In a specific implementation, the 3D printer can adjust the temperature of the hot end 12 and the hot bed 32, adjust the temperature of the hot end 12 to heat the printing material to a molten state, and adjust the temperature of the hot bed 32 to adhere the printing material extruded by the hot end 12 to the printing panel 31. The 3D printer print head 1 is slidably connected to the first guide rail 13, and the 3D printer print head 1 can move along the length direction of the first guide rail 13, that is, the displacement of the 3D printer print head 1 relative to the printing panel 31 along the length direction of the first guide rail 13 is realized, and the hot bed 32 is slidably connected to the second guide rail 14, and the hot bed 32 moves along the length direction of the second guide rail 14, that is, the displacement of the 3D printer print head 1 relative to the printing panel 31 along the length direction of the second guide rail 14 is realized, and the length direction of the second guide rail 14 is perpendicular to the length direction of the first guide rail 13. Furthermore, the first guide rail 13 is slidably connected to the third guide rail 15, and the 3D printer can achieve displacement of the 3D printer print head 1 relative to the print panel 31 in a direction perpendicular to the length of the second guide rail 14 and in a direction perpendicular to the length of the first guide rail 13 by moving the first guide rail 13 along the third guide rail 15. That is, the 3D printer can achieve relative displacement between the 3D printer print head 1 and the print panel 31 in three mutually perpendicular directions, thereby printing a 3D object.

[0086] Each implementation in this specification is described in a progressive manner, and each implementation focuses on the differences from other implementations. The same or similar parts between the various implementations can be referenced to each other.

[0087] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0088] The above is a detailed introduction to a material line resistance detection device, a 3D printer print head and a 3D printer provided by the present application, but the content of this specification should not be understood as limiting the present application.

Claims

1. A material line resistance detection device, characterized in that: include: An extrusion assembly is provided with an extrusion mechanism, and the extrusion mechanism is used to drive the material line to be transmitted to the hot end; A feeding assembly is provided with a feeding channel, the feeding port of the feeding channel is used to receive the material line from the feeding device, the feeding port of the feeding channel faces the extrusion assembly, and can move relative to the extrusion assembly along the direction of the material line in the feeding channel; the feeding device is provided with a material tray; the material line of the material tray is sent out from the feeding port of the feeding device to the feeding port of the feeding channel, a material line pipe is provided between the feeding port of the feeding device and the feeding port of the feeding channel, and the length of the material line between the feeding port of the feeding device and the feeding port of the feeding channel is the length of the material line pipe; An elastic element, one end of which is connected to the extrusion assembly, and the other end of which is connected to the feeding assembly, for preventing the extrusion assembly and the feeding assembly from approaching each other in the direction of the material line in the feeding channel. When the feeding assembly approaches the extrusion assembly, the length of the material line between the feeding device and the extrusion assembly will be shortened; A trigger element, disposed in one of the extrusion assembly or the feeding assembly; A detection element is provided in the other one of the extrusion assembly or the feeding assembly, and is used to detect the relative distance or the change of the relative distance between the extrusion assembly and the feeding assembly by detecting the relative distance or the change of the relative distance with the trigger element.

2. The material line resistance detection device according to claim 1, characterized in that: The extrusion assembly is provided with a containing cavity, and the discharge port of the feeding assembly is sleeved in the containing cavity.

3. The material line resistance detection device according to claim 2, characterized in that: A slide groove is arranged in the accommodating cavity, and the slide groove is used to guide the direction of relative movement between the extrusion component and the feeding component; a limiter is arranged on the upper part of the accommodating cavity to limit the sliding position of the feeding component when it moves back to the extrusion component, so as to prevent the feeding component from escaping from the accommodating cavity.

4. The material line resistance detection device according to claim 3 is characterized in that: The slide groove is an elongated hole, the trigger element is arranged on a protrusion on the outer side of the feeding component, the protrusion protrudes into the slide groove, and the detection element is arranged on the elongated hole.

5. The material line resistance detection device according to claim 1, characterized in that: The discharge port of the feeding assembly is cylindrical, and the elastic element comprises a spring. One end of the spring is sleeved on the discharge port, and the other end is in contact with the extrusion assembly.

6. The material line resistance detection device according to any one of claims 1 to 5, characterized in that: The trigger element includes a magnetic element; Correspondingly, the detection element includes a Hall sensor for detecting the distance from the magnetic element.

7. The material line resistance detection device according to any one of claims 1 to 5, characterized in that: The trigger element includes a protrusion; Correspondingly, the detection module includes at least one travel switch, and when the relative distance between the extrusion component and the feeding component is a preset value, the protrusion touches and triggers the travel switch.

8. A 3D printer print head, characterized in that: include: The material line resistance detection device and the hot end as described in any one of claims 1 to 7, The extrusion mechanism of the material line resistance detection device is used to drive the material line to be transmitted to the hot end; The feeding assembly of the material line resistance detection device is used to receive the material line from the feeding device; The hot end is used to heat the material line in the hot end to a molten state; The hot end is also used to extrude the molten material line to print a three-dimensional model.

9. A three-dimensional printer, characterized in that: include: A printing platform, a driving device and a 3D printer print head as claimed in claim 8, wherein the 3D printer print head is arranged above the printing platform, and the driving device is used to drive the 3D printer print head to generate relative displacement with the printing platform.

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