Multicolor consumable supply system of FDM type 3D printer

Abstract

The utility model belongs to the technical field of 3D printers, and particularly relates to a multicolor consumable supply system of an FDM type 3D printer. The feeding device comprises at least two feeding units, each feeding unit comprises a support, a driving wheel is arranged at the front end of the support, a driven wheel is arranged at the rear end of the support, a material disc is erected above the driving wheel and the driven wheel, and the material disc is externally tangent to the driving wheel and the driven wheel respectively; the driving wheel comprises a wheel body and a side gear; the side gear is connected with the wheel body through a ratchet wheel structure; the extruder is arranged in the bracket, and a gear shaft of the extruder is meshed with the side gear; and the power module is also arranged in the support, and an output gear of the power module is meshed with the gear shaft. The feeding and discharging mechanism is used for solving the technical problems that in the prior art, a feeding and discharging mechanism of a 3D printer is complex in structure, use reliability is not high, and production and maintenance are difficult.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of 3D printer, concretely relates to a multi -color consumable feeding system of FDM type 3D printer. BACKGROUND

[0002] 3D printer is a kind of cumulative manufacturing technology, it is a kind of machine of rapid prototyping technology, it is a kind of three-dimensional object that is manufactured by printing adherable material such as special wax material, powder metal or plastic etc. layer by layer based on digital model file. Three-dimensional printer is used to manufacture product at present stage. The technology of constructing object by layer printing. The principle of 3D printer is that data and raw materials are put into 3D printer, and machine can make product layer by layer according to program. FDM (Fused Deposition Modeling) is the method that various hot-melt type filament materials are heated and formed in nozzle.

[0003] FDM type 3D printer is used with reel that is wound with filament material (hereinafter referred to as consumable), and reel is the core component in feeding system. In the working of FDM type 3D printer, generally, there are two extruders, such as the one that is arranged on 3D printer and is close to nozzle, called near-end extruder, is used to feed nozzle, and the one that is used to extract consumable on reel, called far-end extruder. In the use process of multi-color FDM type 3D printer, different colors of consumable are switched, when the consumable of certain color is withdrawn by near-end extruder, far-end extruder also withdraws consumable synchronously, but the withdrawn consumable is not rewound on reel, and is accumulated near reel, especially when more consumable is withdrawn, not only it is not beautiful, but also it can be knotted, and affect the smoothness of subsequent feeding.

[0004] In order to solve this problem, the prior art proposes a solution, such as the invention patent with application number 202410162846.9, which discloses feeding and withdrawing equipment and 3D printer, and the invention patent with application number 202410934371.0, which discloses feeding and withdrawing mechanism for 3D printer and 3D printing system, but the mechanism of feeding and withdrawing part mentioned in the above invention patent is complex in structure, which brings the situation of low use reliability and difficult production and maintenance. UTILITY MODEL CONTENT

[0005] The utility model provides a multi -color consumable feeding system of FDM type 3D printer for solving the technical problem of the feeding and withdrawing mechanism structure of 3D printer in prior art is complex, resulting in low use reliability and difficult production and maintenance.

[0006] The technical scheme for solving the above technical problem of the utility model is as follows: a multi -color consumable feeding system of FDM type 3D printer, comprising:

[0007] At least two supply units, each of the supply units comprising:

[0008] A support, a driving wheel is arranged at the front end of the support, a driven wheel is arranged at the rear end of the support, a tray is arranged above the driving wheel and the driven wheel, and the tray is externally tangent to the driving wheel and the driven wheel respectively;

[0009] The driving wheel comprises a wheel body and a side gear, and the side gear and the wheel body are connected through a ratchet structure;

[0010] An extruder is arranged in the support, and a gear shaft of the extruder is engaged with the side gear;

[0011] A power module is also arranged in the support, and an output gear of the power module is engaged with the gear shaft.

[0012] In the use process of the utility model, the tray is placed on the driving wheel and the driven wheel, when feeding, the power module drives the extruder to extract consumables, the tray will rotate on the driving wheel and the driven wheel under the extraction of the consumables, at this time, the driving wheel does not rotate; when discharging, the driving wheel will rotate under the driving of the ratchet structure, and the driving wheel will drive the tray to rotate reversely, so that the discharged consumables are wound back to the tray, thereby avoiding the accumulation of the discharged consumables.

[0013] Further, the power module is fixedly installed on a first fixing plate, and the first fixing plate is detachably connected with the support;

[0014] The extruder is fixedly installed on a second fixing plate, and the second fixing plate is detachably connected with the support.

[0015] The first fixing plate and the second fixing plate are both provided with a connecting hole in the bottom surface and are fixedly connected with the bottom surface of the support.

[0016] Further, a first transmission gear is arranged between the output gear and the gear shaft, and the first transmission gear is connected with the first fixing plate;

[0017] A second transmission gear is arranged between the gear shaft and the side gear, and the second transmission gear is connected with the inner wall of the support.

[0018] The first transmission gear and the second transmission gear change or maintain the transmission ratio of each other, so that the rotation speeds of the power module, the extruder and the side gear of the driving wheel are matched.

[0019] Further, a consumable in-place sensor is arranged at the rear end of the discharge port of the extruder, and the consumable in-place sensor is arranged in the support;

[0020] The front end of the feeding port of the extruder is provided with a broken material detection sensor, and the broken material detection sensor is arranged on the second fixed plate.

[0021] The beneficial effects of the present step are that the consumables are detected by the consumable in-place sensor and the broken material detection sensor, and the feeding stability is maintained.

[0022] Further, the side gear is provided with a positioning protrusion on one side of the wheel body, an elastic wheel is sleeved on the positioning protrusion, and at least three elastic strips are uniformly distributed on the circumferential surface of the elastic wheel.

[0023] The inner wall of the wheel body is provided with a corresponding triangular protrusion corresponding to the position of the elastic wheel.

[0024] The beneficial effects of the present step are that the elastic strips can resist the triangular protrusion in one direction to realize one-way rotation.

[0025] Further, the driving wheel is provided with a limiting plate at the other end of the side gear and the two ends of the driven wheel.

[0026] The beneficial effects of the present step are that the limiting plate can prevent the material tray from being pulled out of the driving wheel and the driven wheel.

[0027] Further, at least one feeding buffer is further included, each feeding buffer corresponds to each feeding unit one by one, and the feeding buffer is arranged at the rear end of the feeding unit.

[0028] The feeding buffer comprises:

[0029] a bottom plate;

[0030] a slider assembly arranged on the top surface of the bottom plate, the slider assembly comprising a sliding rail and a sliding block;

[0031] a front end switch support and a rear end switch support, the front end switch support and the rear end switch support being arranged at the two ends of the bottom plate respectively, and the top surfaces of the front end switch support and the rear end switch support being provided with micro switches, the contacts of the two micro switches facing the sliding block;

[0032] wire holes are formed in the front end switch support, the rear end switch support and the sliding block, a first protective tube is connected to the wire hole of the sliding block, the first protective tube passes through the wire hole of the rear end switch support, and a second protective tube is connected to the outside of the wire hole of the front end switch support.

[0033] a spring is arranged between the sliding block and the rear end switch support, and the spring is sleeved outside the first protective tube.

[0034] The beneficial effect of the step is: the effect of the different synchronization of the near-end extruder and the far-end extruder on the consumables is reduced or eliminated by the feeding buffer.

[0035] Further, the sliding block is provided with a threaded hole corresponding to the contact position of the micro switch of the rear-end switch support, and a screw is screwed in the threaded hole.

[0036] The beneficial effect of the step is: the stroke of triggering the micro switch is adjusted by adjusting the screwing length of the screw.

[0037] Further, one side of the sliding block facing the front-end switch support is provided with a protection tube coaxial with the wire passing hole.

[0038] One side of the front-end switch support facing the sliding block is provided with a guide hole matched with the protection tube, and the guide hole is coaxial with the wire passing hole of the front-end switch support.

[0039] The beneficial effect of the step is: the consumables without Teflon tube protection are protected by the protection tube.

[0040] The beneficial effect of the utility model is:

[0041] 1. The application is connected through the power module, gear shaft and driving wheel meshing, and the driving wheel is provided with a ratchet structure, so that the extruder does not drive the driving wheel to rotate during feeding, drives the driving wheel to rotate during material returning, realizes that the feeding does not affect the rotation of the material disc, drives the material disc to rotate reversely during material returning, re-winds the returned consumables on the material disc, and avoids that the returned material is accumulated in the feeding port of the extruder.

[0042] 2. Compared with the prior art, only one power module is used, and the transmission structure matched with the power module is simpler, and the disassembly and assembly are more convenient, so that the production and daily maintenance are facilitated, the cost is saved, and the reliability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to the drawings without creating creative labor.

[0044] Figure 1 A perspective view of a feeding unit of a multi-color consumable feeding system of an FDM type 3D printer is provided.

[0045] Figure 2The utility model provides a kind of structure schematic diagram of feed unit in the multi-color consumable feed system of FDM type 3D printer provided by the utility model.

[0046] Figure 3 The application schematic diagram of feed unit in the multi-color consumable feed system of FDM type 3D printer provided by the utility model;

[0047] Figure 4 For Figure 2 The top view of;

[0048] Figure 5 For Figure 2 The left view of;

[0049] Figure 6 For Figure 5 The cross-sectional schematic view of A-A direction in;

[0050] Figure 7 The perspective view of driving wheel in the multi-color consumable feed system of FDM type 3D printer provided by the utility model for feed unit;

[0051] Figure 8 The structure schematic diagram of driving wheel in the multi-color consumable feed system of FDM type 3D printer provided by the utility model for feed unit;

[0052] Figure 9 For Figure 8 The cross-sectional schematic view of B-B direction in;

[0053] Figure 10 For Figure 9 The cross-sectional schematic view of C-C direction in;

[0054] Figure 11 The perspective view of feed buffer in the multi-color consumable feed system of FDM type 3D printer provided by the utility model;

[0055] Figure 12 The application schematic diagram of feed buffer in the multi-color consumable feed system of FDM type 3D printer provided by the utility model.

[0056] Reference signs:

[0057] 1-support;2-extruder;3-power module;4-cutting detection sensor;5-consumable in place sensor;6-tray;7-feed buffer;8-sheath pipe;

[0058] 11 - driving wheel; 12 - driven wheel; 13 - limiting plate; 14 - elastic wheel; 21 - gear shaft; 22 - second fixed plate; 23 - second transmission gear; 31 - output gear; 32 - first fixed plate; 33 - first transmission gear; 61 - consumable; 71 - bottom plate; 72 - slider assembly; 73 - front end switch support; 74 - rear end switch support; 75 - spring;

[0059] 111 - wheel body; 112 - edge gear; 141 - elastic strip; 721 - slide rail; 722 - slider; 731 - guide hole;

[0060] 1111 - triangular protrusion; 1121 - positioning protrusion; 7221 - protection tube; 7222 - screw. DETAILED DESCRIPTION

[0061] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, therefore only as an example, and cannot limit the protection scope of the utility model.

[0062] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be the usual meaning understood by the technical personnel in the field of the utility model.

[0063] In the description of the present application, the terms "first", "second" and the like are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0064] In the present application, unless otherwise specifically specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0065] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] Example

[0067] like Figures 1-12 As shown, this utility model discloses a multi-color filament feeding system for an FDM 3D printer, which solves the problem that when switching between different colors of filament in a 3D printer, the returned filament will accumulate at the feed inlet of the far-end extruder, affecting the smoothness of subsequent feeding. Compared with similar products in the prior art, the embodiment of this utility model has a simpler structure, higher reliability, and is easier to produce and maintain.

[0068] like Figures 1-6 As shown, the structure of this utility model includes:

[0069] At least two feeding units, different feeding units for supplying consumables 61 of different colors, each feeding unit comprising:

[0070] A support 1 is provided with a drive wheel 11 at its front end and a driven wheel 12 at its rear end. A material tray 6 is mounted above the drive wheel 11 and the driven wheel 12, and the material tray 6 is tangent to the drive wheel 11 and the driven wheel 12 respectively.

[0071] The drive wheel 11 includes a wheel body 111 and a side gear 112, and the side gear 112 and the wheel body 111 are connected by a ratchet structure;

[0072] Extruder 2, which is disposed inside the support 1, wherein the gear shaft 21 of the extruder 2 meshes with the side gear 112;

[0073] The power module 3 is also located in the bracket 1. The output gear 31 of the power module 3 meshes with the gear shaft 21. The power module 3 itself can use a DC geared motor.

[0074] The utility model discloses a power module 3 is driven to extract consumable 61 of extruder 2, and the material tray 6 will be under the extraction of consumable 61, and the material tray 6 rotates on the driving wheel 11 and the driven wheel 12, and the driving wheel 11 is not rotating at this moment, when feeding, the driving wheel 11 will rotate under the driving of ratchet structure, and the driving wheel 11 will drive the material tray 6 to rotate reversely, and the withdrawn consumable 61 is re-wound to the material tray 6, avoiding the accumulation of the withdrawn consumable 61, the feeding system of the application also includes corresponding control module, can control power module 3 in different feeding units respectively, realizes the feeding of different feeding units in turn, so that 3D printer switches consumable.

[0075] In order to facilitate assembly, the power module 3 is fixedly installed on the first fixed plate 32, and the first fixed plate 32 is detachably connected with the support 1.

[0076] The extruder 2 is fixedly installed on the second fixed plate 22, and the second fixed plate 22 is detachably connected with the support 1.

[0077] In this way, the first fixed plate 32 and the second fixed plate 22 are both provided with connecting holes in the bottom surface and are fixedly connected with the bottom surface of the support 1, and the connecting mode is usually a bolt connection mode.

[0078] In an embodiment, the output gear 31 and the gear shaft 21 are provided with a first transmission gear 33, and the first transmission gear 33 is connected to the first fixed plate 32.

[0079] The gear shaft 21 and the side gear 112 are provided with a second transmission gear 23, and the second transmission gear 23 is connected to the inner wall of the support 1.

[0080] The first transmission gear 33 and the second transmission gear 23 change or maintain the transmission ratio of each other, so that the rotation speeds of the power module 3, the extruder 2 and the side gear 112 of the driving wheel 11 are matched.

[0081] In an embodiment, the rear end of the discharge port of the extruder 2 is provided with a consumable in-place sensor 5, and the consumable in-place sensor 5 is arranged in the support 1.

[0082] The front end of the feeding port of the extruder 2 is provided with a broken material detection sensor 4, and the broken material detection sensor 4 is arranged on the second fixed plate 22.

[0083] In actual application, the material breakage detection sensor 4 and the consumable in-place sensor 5 can use the same type of sensor, but the functions are not exactly the same, so different names are needed to distinguish, such as the consumable in-place sensor 5 is to prevent the consumable 61 from not entering or being consumed, and the material breakage detection sensor 4 is to prevent the consumable 61 from being broken; both sensors allow the consumable 61 to pass through and then detect it; the consumable 61 is detected by the consumable in-place sensor 5 and the material breakage detection sensor 4 to maintain the stability of the feeding. In addition, the part of the consumable 61 exposed outside the consumable in-place sensor 5 and the material breakage detection sensor 4 is sleeved with a Teflon tube.

[0084] In an embodiment, the ratchet structure described above can be arranged in the following way, which can be specifically referred to as Figure 9 and Figure 10 The edge gear 112 is provided with a positioning protrusion 1121 on one side of the wheel body 111, and the elastic wheel 14 is sleeved on the positioning protrusion 1121, and the elastic wheel 14 is connected through the positioning protrusion 1121, wherein the shape of the positioning protrusion 1121 is various, and in this embodiment, the cross section of the positioning protrusion 1121 is hexagonal; at least three elastic strips 141 are uniformly distributed on the circumferential surface of the elastic wheel 14; the bearings, shafts and the like in the figure are conventional technologies, and details are omitted.

[0085] The inner wall of the wheel body 111 is provided with a corresponding triangular protrusion 1111 corresponding to the position of the elastic wheel 14.

[0086] In Figure 10 , when the elastic wheel 14 rotates clockwise, the elastic strip 141 is compressed inward when encountering the slope surface of the triangular protrusion 1111, and the wheel body 111 cannot be driven to rotate; on the contrary, the elastic strip 141 can resist the vertical surface of the triangular protrusion 1111, and the wheel body 111 is driven to rotate, so as to realize the one-way rotation of the driving wheel 11. It should be noted that when setting the above ratchet structure, it is necessary to ensure that the driving wheel 11 is driven to rotate only when the material is withdrawn from the extruder 2, and it must not be incorrectly set.

[0087] In an embodiment, the driving wheel 11 is provided with a limiting plate 13 at the other end relative to the edge gear 112 and the two ends of the driven wheel 12.

[0088] The limiting plate 13 can prevent the material tray 6 from being pulled out or dumped from the side of the driving wheel 11 and the driven wheel 12 when the material tray 6 rotates on the driving wheel 11 and the driven wheel 12.

[0089] In an embodiment, in order to prevent the remote extruder and the near-end extruder from being out of sync and causing the consumable to accumulate or be pulled, at least one feeding buffer 7 is further included, each of the feeding buffers 7 corresponds to each of the feeding units one by one, and the feeding buffer 7 is arranged at the rear end of the feeding unit.

[0090] The feeding buffer 7 comprises:

[0091] a bottom plate 71;

[0092] a slider assembly 72 provided on the top surface of the bottom plate 71, the slider assembly 72 comprising a sliding rail 721 and a slider 722;

[0093] a front switch support 73 and a rear switch support 74 provided at the two ends of the bottom plate 71 respectively, and the top surfaces of the front switch support 73 and the rear switch support 74 are each provided with a micro switch, and the contacts of the two micro switches are both directed towards the slider 722;

[0094] thread holes are formed on the front switch support 73, the rear switch support 74 and the slider 722, a first protective tube is connected to the thread hole of the slider 722, the first protective tube passes through the thread hole of the rear switch support 74, and a second protective tube is connected to the outside of the thread hole of the front switch support 73;

[0095] a spring 75 is provided between the slider 722 and the rear switch support 74, and the spring 75 is sleeved outside the first protective tube.

[0096] The feeding buffer 7 is used to alleviate or eliminate the influence of the asynchronization between the near-end extruder 2 and the far-end extruder 2 on the consumable 61. The specific description is as follows: the micro switches on the front switch support 73 and the rear switch support 74 are both used to control the start and stop of the far-end extruder, which is the extruder 2 of the feeding unit; when the feeding speed of the far-end extruder is greater than the consumption speed of the near-end extruder, the extra consumable 61 will be located between the slider 722 and the front switch support 73, and will push the slider 722 towards the rear switch support 74 until the slider 722 abuts against the micro switch on the rear switch support 74, at which time the micro switch will stop the feeding of the far-end extruder, then the near-end extruder will continuously consume the extra consumable 61 in the feeding buffer 7, and the slider 722 will move forward under the action of the spring 75 until it abuts against the micro switch on the front switch support 73, at which time the micro switch will make the far-end extruder start feeding again; such reciprocation can overcome the defect of the asynchronization between the near-end extruder and the far-end extruder, and maintain the feeding stability.

[0097] In order to improve the application effect of the feeding buffer, a threaded hole can be provided on the slider 722 corresponding to the position of the contact of the micro switch on the rear switch support 74, and a screw 7222 is screwed into the threaded hole.

[0098] The travel of the micro switch on the rear end switch bracket 74 triggered by the slider 722 is adjusted by adjusting the screwing length of the screw 7222.

[0099] In addition, in actual application, the sheath pipe 8 of the consumable 61 is arranged on the slider 722 or the front end switch bracket 73 by a quick connector or the like, for protecting the consumable 61, wherein the sheath pipe 8 is generally a Teflon pipe; one side of the slider 722 facing the front end switch bracket 73 is provided with a protection pipe 7221 coaxial with the wire passing hole.

[0100] One side of the front end switch bracket 73 facing the slider 722 is provided with a guide hole 731 adapted to the protection pipe 7221, and the guide hole 731 is coaxial with the wire passing hole of the front end switch bracket 73.

[0101] Figure 12 The protection pipe 7221 and the guide hole 731 are separately shown for the convenience of representing the respective structures of the protection pipe 7221 and the guide hole 731; in actual application, the protection pipe 7221 moves in the guide hole 731 and is not separated, thereby realizing the protection of the consumable 61 without the protection of the Teflon pipe.

[0102] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A multi-color consumable supply system for an FDM-type 3D printer, characterized by, The utility model relates to a kind of material feeding device, including: At least two feeding units, each of the feeding units includes: Support, the front end of the support is equipped with driving wheel, the rear end of the support is equipped with driven wheel, the upper of the driving wheel and the driven wheel is equipped with material tray, the material tray is respectively with the driving wheel and the driven wheel circumscribed; The driving wheel includes wheel body and side gear, the side gear and the wheel body are connected by ratchet structure; Extruder, the extruder is equipped in the support, the gear shaft of the extruder is engaged with the side gear; Power module, the power module is also equipped in the support, the output gear of the power module is engaged with the gear shaft.

2. The multi-color consumable supply system for FDM-type 3D printer according to claim 1, wherein The power module is fixedly installed on the first fixed plate, and the first fixed plate is detachably connected with the support; The extruder is fixedly installed on the second fixed plate, and the second fixed plate is detachably connected with the support.

3. The multi-color consumable supply system for FDM-type 3D printer according to claim 2, wherein The first transmission gear is provided between the output gear and the gear shaft, and the first transmission gear is connected to the first fixed plate. The second transmission gear is provided between the gear shaft and the side gear, and the second transmission gear is connected to the inner wall of the support.

4. The multi-color consumable supply system for FDM-type 3D printer according to claim 3, wherein The rear end of the discharge port of the extruder is provided with a consumable in-place sensor, and the consumable in-place sensor is arranged in the support. The front end of the feed inlet of the extruder is provided with a broken material detection sensor, and the broken material detection sensor is arranged on the second fixed plate. 5.The multi-color consumable supply system of an FDM-type 3D printer according to claim 1, wherein, The side of the side gear facing the wheel body is provided with a positioning lug, and the positioning lug is sleeved with an elastic wheel. The inner wall of the wheel body is provided with corresponding triangular protrusions corresponding to the position of the elastic wheel. 6.The multi-color consumable supply system of an FDM-type 3D printer according to claim 1, wherein The other end of the driving wheel relative to the side gear and the two ends of the driven wheel are each provided with a limiting plate.

7. The multi-color consumable supply system of the FDM-type 3D printer according to claim 1, wherein Further comprising at least one feed buffer, each of the feed buffers corresponds to each of the feeding units, and the feed buffer is arranged at the rear end of the feeding unit. The feed buffer includes: A bottom plate; A slide assembly arranged on the top surface of the bottom plate, the slide assembly including a slide rail and a slide block; A front end switch support and a rear end switch support, the front end switch support and the rear end switch support are respectively arranged at the two ends of the bottom plate, and the top surfaces of the front end switch support and the rear end switch support are each provided with a micro switch, and the contacts of the two micro switches are each directed towards the slide block; Each of the front end switch support, the rear end switch support and the slide block is provided with a wire hole, a first protective tube is connected to the wire hole of the slide block, the first protective tube passes through the wire hole of the rear end switch support, and a second protective tube is connected to the outside of the wire hole of the front end switch support. A spring is arranged between the slide block and the rear end switch support, and the spring is sleeved outside the first protective tube.

8. The multi-color consumable supply system for FDM-type 3D printer according to claim 7, wherein, The slide block is provided with a threaded hole corresponding to the position of the contact of the micro switch of the rear end switch support, and a screw is screwed into the threaded hole. 9.The multi-color consumable supply system of the FDM-type 3D printer according to claim 7, wherein, The side of the slide block facing the front end switch support is provided with a protective tube, and the protective tube is coaxial with the wire hole. The front end switch support is provided with a guide hole on the side facing the slider, the guide hole is matched with the protection tube, and the guide hole is coaxial with the wire passing hole of the front end switch support.

Images