Feeding device and three-dimensional printer

Abstract

The present application discloses a feeding device and a three-dimensional printer. The feeding device comprises a shell with an opening, a conveying drive assembly arranged in the shell, and a flap mechanism rotatably mounted on the shell; the conveying drive member comprises a conveying motor, and a driving gear arranged on the output shaft of the conveying motor; the flap mechanism comprises a flap member that closes the opening, and a driven wheel member rotatably mounted on the inner surface of the flap member; a material passing gap for consumables to pass through is formed between the driven wheel member and the driving gear; one end of the flap member is rotatably connected to the shell, and the other end of the flap member is engaged with the shell. The flap mechanism is rotatably mounted on the shell through the flap member. When an abnormality occurs in the feeding device, the flap mechanism can be opened to quickly find the problem and deal with it. In addition, after the feeding device has been working for a long time, when the driving gear rubs against the surface of the consumables to generate consumable dust accumulation, the flap mechanism can also be quickly opened for cleaning, thereby improving the maintainability of the feeding device.

Description

Technical Field

[0001] The present application relates to the field of three-dimensional printing, and in particular to a feeding device and a three-dimensional printer. Background Art

[0002] 3D printers (three-dimensional printers) mainly rely on feeding devices to extrude filamentary materials and print models. At present, the built-in feeding devices of most 3D printers do not have the function of easy disassembly and maintenance. Machines with this function mostly use external feeding device structures. For example, if a gantry 3D printer with an aluminum profile frame is used, a feeding device is added to the external frame, and the gear clamping mechanism and the inlet and outlet of the feeding device are exposed. The gears and bearing parts of the feeding device are easily affected by air temperature and humidity. It is difficult to maintain the exposed feeding device, and the external environment will cause the internal parts of the feeding device to rust, affecting the function. In a related closed box 3D printer, the feeding device is installed on the left and right sides of the fuselage, and the plastic shell covers the feeding device when it is closed. When loading consumables in this way, one end of the consumables needs to be blindly plugged into the feed hole, and the powder generated by the long-term friction between the internal gears of the feeding device (when the consumables are hard or the surface is smooth, gear conveying is required) and the consumables cannot be cleaned, so the feeding device cannot be effectively used and maintained. Summary of the invention

[0003] The purpose of the present application is to provide a feeding device, aiming to solve the problem in the prior art that it is inconvenient to maintain the inside of the feeding device of a 3D printer.

[0004] To achieve this purpose, the present application embodiment adopts the following technical solutions:

[0005] The feeding device comprises a shell with an opening, a conveying drive component arranged in the shell, and a flip mechanism rotatably mounted on the shell; the conveying drive component comprises a conveying motor and a driving gear arranged on the output shaft of the conveying motor; the flip mechanism comprises a flip component that closes the opening, and a driven wheel component rotatably mounted on the inner surface of the flip component; a material passing gap for consumables to pass through is formed between the driven wheel component and the driving gear; one end of the flip component is rotatably connected to the shell, and the other end of the flip component is clamped with the shell.

[0006] In one embodiment, the flip cover mechanism further comprises a mounting seat rotatably mounted on the flip cover member, and an elastic member located between the mounting seat and the flip cover member; the driven wheel member is rotatably mounted on the mounting seat.

[0007] In one embodiment, the elastic member is a spring, a positioning column is provided on the mounting seat, and one end of the elastic member is sleeved on the positioning column.

[0008] In one embodiment, a notch is formed on the mounting seat, and the positioning column is located in the notch.

[0009] In one embodiment, a positioning groove is formed on the inner surface of the flip cover, and one end of the elastic member away from the mounting seat is inserted into the positioning groove.

[0010] In one embodiment, the inner surface of the flip cover is provided with two rotating brackets that are opposite to each other and spaced apart, a first rotating shaft is provided between the mounting seat and the rotating bracket, and the mounting seat is rotatably mounted between the two rotating brackets via the first rotating shaft.

[0011] In one embodiment, a first accommodating groove is formed on the mounting seat, and the structure of the driven wheel component is located in the first accommodating groove.

[0012] In one embodiment, the driven wheel member is a bearing, and a guide groove is provided on the outer peripheral surface of the driven wheel member.

[0013] In one embodiment, an elastic plug is provided on the inner surface of the flip-cover member, and at least one end of the elastic plug is located outside the boundary range of the flip-cover member. When the flip-cover member closes the opening, the elastic plug abuts against the inner surface of the shell (the elastic plug is detachably connected to the flip-cover member, and a knob is provided on the outer surface of the flip-cover member).

[0014] In one embodiment, a second rotating shaft is provided between the flip cover and the shell, the second rotating shaft is rotatably mounted on the shell, and the flip cover is rotatably mounted on the second rotating shaft.

[0015] In one embodiment, a heat sink is provided inside the shell, and a semicircular groove adapted to the driven wheel member is provided on the heat sink, and a partial structure of the driven wheel member is located in the semicircular groove, and a second accommodating groove is provided on the inner wall of the semicircular groove, and a partial structure of the driving gear is located in the second accommodating groove, and two feed holes that are opposite and spaced apart are also provided on the inner wall of the semicircular groove, and both of the feed holes are connected to the feed gap.

[0016] In one embodiment, the heat sink is further provided with a mounting groove connected to one of the feed holes, and a switch sensor for detecting the state of consumables entering is provided in the mounting groove.

[0017] The purpose of the present application is to provide a three-dimensional printer, comprising the feeding device described in any one of the above embodiments.

[0018] The beneficial effects of the embodiments of the present application are as follows: when the feeding device is in working state, the flip cover member of the flip cover mechanism closes the opening of the shell, and at this time, the components on the flip cover member are all located inside the shell, so that the main components of the feeding device are built into the shell, which can effectively avoid direct contact with foreign objects such as dust particles from the outside, thereby improving the durability of the feeding device. Since the flip cover mechanism is rotatably mounted on the shell through the flip cover member, when an abnormality occurs in the feeding device, the flip cover mechanism can be opened to quickly find the problem and deal with it. In addition, after the feeding device has been working for a long time, when the active gear rubs against the surface of the consumables to cause consumable dust accumulation, the flip cover mechanism can also be quickly opened for cleaning, thereby improving the maintainability of the feeding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the flip cover mechanism of the feeding device in the embodiment of the present application when it is opened;

[0021] Figure 2 for Figure 1 A partial view of the middle driving gear;

[0022] Figure 3 It is a schematic diagram of the flap mechanism of the feeding device in the embodiment of the present application when the opening is closed;

[0023] Figure 4 for Figure 3 A partial view of the middle driving gear;

[0024] Figure 5 A schematic diagram of a flip mechanism in an embodiment of the present application from a first viewing angle;

[0025] Figure 6 is a schematic diagram of a second viewing angle of the flip mechanism in an embodiment of the present application;

[0026] In the figure:

[0027] 1. Shell; 101. Opening; 2. Flip mechanism; 201. Flip member; 2011. Positioning groove; 202. Driven wheel member; 2021. Guide groove; 203. Mounting seat; 2031. Notch; 2032. First accommodating groove; 204. Elastic member; 205. Positioning column; 206. Rotating bracket; 207. First rotating shaft; 208. Elastic plug; 209. Turning knob; 3. Conveying drive assembly; 301. Conveying motor; 302. Driving gear; 4. Feeding gap; 5. Second rotating shaft; 6. Heat sink; 601. Semicircular groove; 6011. Second accommodating groove; 6012. Feeding hole; 602. Mounting groove; 7. Switch sensor; 8. Consumables. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] The feeding device is built into the shell of the print head module, and dust particles and water vapor are blocked outside the shell. The feeding device is blocked and protected by the module shell. The built-in method can provide protection for the feeding device. The feeding device is inside the printing module, and the printing consumables enter from the top of the module, pass through the feeding device, enter the hot end, and are extruded from the nozzle.

[0033] Select the maintenance function scheme of the feeding device. The consumables trigger the feeding signal through the switch sensor inside the module and feed it back to the controller, and the action of the feeding device is controlled according to the code.

[0034] When the 3D printer is working, the gear and driven wheel of the feeding device are connected to two independent fixed parts. The bearing and its attached tensioning mechanism are set on the flap. The consumables are driven by the motor to complete the feeding process when they are engaged. The feeding device is built into the shell of the print head module. When the flap is closed, the spring on the flap mechanism is compressed to generate elastic force, the flap is closed, and the feeding function is performed; when the flap is opened, the bearing is separated from the gear, and the user observes the internal structure of the feeding device and performs cleaning or maintenance.

[0035] The following is a detailed description of the implementation of the feeding device provided in the embodiment of the present application in conjunction with specific embodiments.

[0036] like Figure 1-Figure 3 As shown, an embodiment of the present application proposes a feeding device, comprising a shell 1 with an opening 101, a conveying drive assembly 3 arranged in the shell 1, and a flip mechanism 2 rotatably mounted on the shell 1; the conveying drive member comprises a conveying motor 301, and a driving gear 302 arranged on the output shaft of the conveying motor 301; the flip mechanism 2 comprises a flip member 201 that closes the opening 101, and a driven wheel member 202 rotatably mounted on the inner surface (inner surface, the surface opposite to the driving gear 302; outer surface, the surface facing away from the driving gear 302) of the flip member 201; a material passing gap 4 for the consumables 8 to pass through is formed between the driven wheel member 202 and the driving gear 302; one end of the flip member 201 is rotatably connected to the shell 1, and the other end of the flip member 201 is clamped with the shell 1.

[0037] In the embodiments of the present application, reference is made to Figure 4-Figure 6 When the feeding device is in working state, the flip cover member 201 of the flip cover mechanism 2 closes the opening 101 of the shell 1. At this time, all the components on the flip cover member 201 are located inside the shell 1, so that the main components of the feeding device are built into the shell 1, which can effectively avoid direct contact with foreign objects such as dust particles from the outside, thereby improving the durability of the feeding device. Since the flip cover mechanism 2 is rotatably mounted on the shell 1 through the flip cover member 201, when an abnormality occurs in the feeding device, the flip cover mechanism 2 can be opened to quickly find the problem and solve it. In addition, after the feeding device has been working for a long time, when the active gear 302 rubs against the surface of the consumable 8 to cause dust accumulation of the consumable 8, the flip cover mechanism 2 can also be quickly opened for cleaning, thereby improving the maintainability of the feeding device.

[0038] The specific working process of the feeding device is as follows: the consumable material 8 located at the material gap 4 formed between the driving gear 302 and the driven wheel 202 is compressed, and the driving gear 302 on the output shaft of the conveying motor 301 rotates. When the driving gear 302 rotates, it drives the consumable material 8 to move and is conveyed to the throat and nozzle.

[0039] It can be understood that for consumables 8 with a relatively smooth or hard surface, it is necessary to set a driving gear 302 to drive the consumables 8 to move smoothly and ensure the stability of the consumables 8 feeding. Therefore, the setting of the driving gear 302 can meet the stable transportation of consumables 8 of different properties. The driving gear 302 will inevitably cause dust accumulation due to friction on the surface of the consumables 8, so the dust cleaning is more frequent. The rotating flip cover mechanism 2 can be opened quickly and conveniently, meeting the need for timely dust cleaning. In the prior art, the soft consumables 8 can be transported by using smooth wheels, and it is not easy to generate dust, so the demand for dust cleaning is relatively low.

[0040] Optionally, a flexible sealing member may be further provided on the flip cover 201 or the housing 1 , and when the flip cover 201 closes the opening 101 , the flexible sealing member may close the gap between the flip cover 201 and the inner wall of the opening 101 .

[0041] See also Figure 5-Figure 6 As another specific embodiment of the feeding device provided by the present application, the flip mechanism 2 also includes a mounting seat 203 rotatably mounted on the flip member 201, and an elastic member 204 located between the mounting seat 203 and the flip member 201; the driven wheel member 202 is rotatably mounted on the mounting seat 203. Figure 1-Figure 3 When the flip cover 201 of the flip cover mechanism 2 closes the opening 101, the components on the flip cover 201 are all located in the housing 1, and the conveying device can work normally. The driven wheel 202 cooperates with the driving gear 302 to press the consumable 8, and at this time, the elastic member 204 applies pressure to the mounting seat 203, so that the mounting seat 203 rotates relative to the flip cover 201, and then the pressure of the elastic member 204 is transmitted to the driven wheel 202, so that the driven wheel 202 can keep in contact with the surface of the consumable 8, avoiding the generation of a gap between the driven wheel 202 and the consumable 8. At the same time, the elastic member 204 can also cooperate with the elastic plug 208 on the flip cover member 201 to tightly clamp the flip cover member 201 on the shell 1 (at this time, the elastic member 204 first applies pressure to the flip cover member 201, and fits the elastic plug 208 on the flip cover member 201 with the inner surface of the shell 1, and there is sufficient friction between the elastic plug 208 and the inner surface of the shell 1) so that the flip cover member 201 is not easy to loosen.

[0042] See also Figure 5-Figure 6As another specific embodiment of the feeding device provided by the present application, the elastic member 204 is a spring, a positioning column 205 is provided on the mounting seat 203, and one end of the elastic member 204 is sleeved on the positioning column 205. The spring can move only along its own axial direction through the guiding effect of the positioning column 205, and stably exert force on the mounting seat 203 and the driven wheel member 202. At the same time, the positioning column 205 can also limit the movement of the spring along its own radial direction to avoid the misalignment of the spring member.

[0043] See also Figure 5-Figure 6 As another specific embodiment of the feeding device provided by the present application, a notch 2031 is formed on the mounting seat 203, and the positioning column 205 is located in the notch 2031. On the one hand, the notch 2031 can limit the radial direction of the spring. On the other hand, the notch 2031 is formed on the mounting seat 203, and the elastic member 204 is mostly located in the notch 2031, which reduces the length of the elastic member 204 protruding from the surface of the mounting seat 203, thereby achieving the compactness of the flip mechanism 2.

[0044] See also Figure 5-Figure 6 As another specific embodiment of the feeding device provided by the present application, a positioning groove 2011 is provided on the inner surface of the flip cover 201, and one end of the elastic member 204 away from the mounting seat 203 is inserted into the positioning groove 2011. The positioning groove 2011 can limit the radial direction of the spring, and then cooperate with the positioning column 205 to limit the spring at both ends of the spring.

[0045] See also Figure 6 As another specific embodiment of the feeding device provided by the present application, the inner surface of the flip cover 201 is provided with two rotating brackets 206 arranged opposite to each other and spaced apart, and a first rotating shaft 207 is provided between the mounting seat 203 and the rotating bracket 206. The mounting seat 203 is rotatably mounted between the two rotating brackets 206 through the first rotating shaft 207. Most of the mounting seat 203 is located between the two brackets, and the position protruding from the top of the bracket is small enough to further realize the compactness of the flip cover mechanism 2. At the same time, the two brackets can also limit the mounting seat 203 on both sides of the mounting seat 203.

[0046] See also Figure 6 As another specific embodiment of the feeding device provided by the present application, a first accommodating groove 2032 is provided on the mounting seat 203, and a part of the structure of the driven wheel member 202 (that is, a part of the structure is located in the first accommodating groove 2032, and the part of the structure is located outside the first accommodating groove 2032 and protrudes from the surface of the mounting seat 203) is located in the first accommodating groove 2032. The first accommodating groove 2032 can accommodate a part of the structure of the driven wheel member 202, so that only the remaining part of the driven wheel member 202 is located in the first accommodating groove 2032, and the structure protruding from the surface of the mounting seat 203 is small enough, further improving the compactness of the flip mechanism 2.

[0047] See also Figure 6 As another specific embodiment of the feeding device provided by the present application, the driven wheel 202 is a bearing, and a guide groove 2021 is provided on the outer circumference of the driven wheel 202 (to prevent the consumable 8 from sliding). Optionally, the inner ring of the bearing is mounted on the mounting seat 203, and the outer ring can rotate relative to the inner ring, thereby pressing the consumable 8 while also driving the consumable 8 to move by rotating its own outer ring in cooperation with the driving gear 302.

[0048] See also Figure 4-Figure 6 As another specific embodiment of the feeding device provided by the present application, an elastic plug 208 is provided on the inner surface of the flip cover 201, and at least one end of the elastic plug 208 is located outside the boundary range of the flip cover 201. When the flip cover 201 closes the opening 101, the elastic plug 208 abuts against the inner surface of the housing 1. Figure 4 As shown, when the flip cover 201 closes the opening 101, the elastic plug 208 is pressed into the housing 1 and abuts against the inner surface of the housing 1, so that the flip cover 201 is snapped into the housing 1. It can be understood that the elastic plug 208 has a certain elastic deformation and can be inserted into the housing 1. It can only be deformed when subjected to a sufficiently large force, so as to prevent the flip cover 201 from being easily loosened during use.

[0049] (The elastic plug 208 is detachably connected to the flip cover 201. After the elastic plug 208 has been used for a certain period of time, its elasticity is reduced and it is no longer tightly fitted. A new elastic plug 208 can be replaced. A toggle 209 is provided on the outer surface of the flip cover 201. The operator can toggle the flip cover 201 to release the closed state of the flip cover 201 on the opening 101 of the housing 1.

[0050] See also Figure 1-Figure 3 As another specific embodiment of the feeding device provided by the present application, a second rotating shaft 5 is provided between the flip cover 201 and the housing 1, the second rotating shaft 5 is rotatably mounted on the housing 1, and the flip cover 201 is rotatably mounted on the second rotating shaft 5. That is, the flip cover 201 and the housing 1 are both loosely matched with the second rotating shaft 5, and the flip cover 201 can be rotated relatively easily when opened.

[0051] See also Figure 1-Figure 3As another specific embodiment of the feeding device provided by the present application, a heat sink 6 is provided inside the housing 1, and a semicircular groove 601 adapted to the driven wheel 202 is provided on the heat sink 6, and a part of the structure of the driven wheel 202 is located in the semicircular groove 601, and a second accommodating groove 6011 is provided on the inner wall of the semicircular groove 601, and a part of the structure of the driving gear 302 is located in the second accommodating groove 6011, and two opposite and spaced feeding holes 6012 are also provided on the inner wall of the semicircular groove 601, and both feeding holes 6012 are connected to the feeding gap 4. Most of the structure of the part of the driven wheel 202 protruding from the surface of the mounting seat 203 is located in the semicircular groove 601, and most of the structure of the driving gear 302 is also located in the second accommodating groove 6011, so that most of the part of the driven wheel 202 and the entire part of the driving gear 302 are located within the boundary range of the heat sink 6, so as to realize the compactness of the internal structure of the feeding device.

[0052] See also Figure 1-Figure 4 As another specific embodiment of the feeding device provided by the present application, the heat sink 6 is further provided with a mounting groove 602 connected to one of the material passing holes 6012, and a switch sensor 7 for detecting the state of the consumable 8 entering is provided in the mounting groove 602. After the switch sensor 7 detects the insertion of the consumable 8, it feeds back to the controller, and the 3D printer controls the action of the feeding device according to the code.

[0053] The embodiment of the present application proposes a three-dimensional printer, including the feeding device in any of the above embodiments. When the feeding device of the three-dimensional printer is in working state, the flap member 201 of the flap mechanism 2 closes the opening 101 of the shell 1. At this time, the components on the flap member 201 are all located in the shell 1, so that the main components of the feeding device are built into the shell 1, which can effectively avoid direct contact with foreign objects such as dust particles from the outside, thereby improving the durability of the feeding device. Since the flap mechanism 2 is rotatably mounted on the shell 1 through the flap member 201, when an abnormality occurs in the feeding device, the flap mechanism 2 can be opened to quickly find the problem and deal with it. In addition, after the feeding device has been working for a long time, when the active gear 302 rubs against the surface of the consumable 8 to produce dust accumulation of the consumable 8, the flap mechanism 2 can also be quickly opened for cleaning, thereby improving the maintainability of the feeding device, thereby improving the maintainability of the three-dimensional printer.

[0054] It can be understood that a solution in another specific implementation manner may be a feasible implementation scheme that is further improved on the basis of other embodiments.

[0055] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation methods of the present application. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A feeding device, characterized in that: The invention comprises a shell with an opening, a conveying drive assembly arranged in the shell, and a flip cover mechanism rotatably mounted on the shell; the conveying drive assembly comprises a conveying motor and a driving gear arranged on the output shaft of the conveying motor; the flip cover mechanism comprises a flip cover member closing the opening, and a driven wheel member rotatably mounted on the inner surface of the flip cover member; a material passing gap for consumables to pass through is formed between the driven wheel member and the driving gear; one end of the flip cover member is rotatably connected to the shell, and the other end of the flip cover member is clamped with the shell; The flip cover mechanism further comprises a mounting seat rotatably mounted on the flip cover member, and an elastic member located between the mounting seat and the flip cover member; the driven wheel member is rotatably mounted on the mounting seat; The elastic member is a spring, a positioning column is provided on the mounting seat, and one end of the elastic member is sleeved on the positioning column; wherein, when the flip cover closes the opening, the driven wheel member cooperates with the driving gear to press the consumables, the elastic member applies pressure to the mounting seat, and the spring is guided by the positioning column.

2. The feeding device according to claim 1, characterized in that: The mounting seat is provided with a notch, and the positioning column is located in the notch.

3. The feeding device according to claim 1, characterized in that: A positioning groove is formed on the inner surface of the flip cover, and one end of the elastic member away from the mounting seat is inserted into the positioning groove.

4. The feeding device according to claim 2, characterized in that: The inner surface of the flip cover is provided with two rotating brackets which are arranged opposite to each other and at intervals. A first rotating shaft is provided between the mounting seat and the rotating bracket. The mounting seat is rotatably mounted between the two rotating brackets via the first rotating shaft.

5. The feeding device according to claim 2, characterized in that: The mounting seat is provided with a first accommodating groove, and the structure of the driven wheel component is located in the first accommodating groove.

6. The feeding device according to any one of claims 1 to 5, characterized in that: The driven wheel component is a bearing, and a guide groove is provided on the outer peripheral surface of the driven wheel component.

7. The feeding device according to any one of claims 1 to 5, characterized in that: An elastic plug is provided on the inner surface of the flip cover, at least one end of the elastic plug is located outside the boundary range of the flip cover, and when the flip cover closes the opening, the elastic plug abuts against the inner surface of the shell.

8. The feeding device according to any one of claims 1 to 5, characterized in that: A second rotating shaft is arranged between the flip cover and the shell. The second rotating shaft is rotatably mounted on the shell, and the flip cover is rotatably mounted on the second rotating shaft.

9. The feeding device according to any one of claims 1 to 5, characterized in that: A heat sink is provided inside the shell, and a semicircular groove adapted to the driven wheel member is provided on the heat sink, and a partial structure of the driven wheel member is located in the semicircular groove. A second accommodating groove is provided on the inner wall of the semicircular groove, and a partial structure of the driving gear is located in the second accommodating groove. The inner wall of the semicircular groove is also provided with two feeding holes that are opposite and spaced apart, and both of the two feeding holes are connected to the feeding gap.

10. The feeding device according to claim 9, characterized in that: The heat sink is also provided with a mounting groove connected with one of the material passing holes, and a switch sensor for detecting the state of consumables entering is arranged in the mounting groove.

11. A three-dimensional printer, characterized in that Comprising a feeding device as described in any one of claims 1-10.

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