Extrusion device and 3D printing equipment

Abstract

The utility model belongs to the technical field of 3D printing, and particularly provides an extrusion device and 3D printing equipment. The extrusion device comprises a shell, an extrusion head, a driving device and a control device, wherein the shell is internally provided with a containing space, and consumables can penetrate through the containing space; the cutting mechanism is installed in the containing space and comprises a gear and rack assembly and a blade, the gear and rack assembly is connected with the blade, and the gear and rack assembly can drive the blade to move in the direction close to the consumables so as to cut off the consumables. The utility model aims to solve the problems that the printing head is easily blocked and the molten consumable is easily polluted when the consumable of the 3D printing equipment is directly withdrawn when the consumable is replaced, the consumable can be conveniently replaced by an operator, the structure is simple, and the implementation is easier.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printing, and specifically provides an extrusion device and a 3D printing device. Background Art

[0002] In 3D printing equipment, when it is necessary to replace consumables, it is usually necessary to remove the consumables originally used inside the printer head and replace them outside the printer head. However, since the printer head is a high-temperature working component, the process of consumables exiting the print head is limited by the shape and size of the print head, making it very easy for molten consumables to draw or clog the print head, increasing the processing time of operators, thereby reducing the overall work efficiency of the printing equipment; and the original molten consumables are also easy to drip onto the equipment during the withdrawal process, causing pollution to the equipment. Utility Model Content

[0003] One purpose of the utility model is to provide an extrusion device capable of cutting off consumables to solve the above-mentioned problem.

[0004] To achieve the above object, the utility model provides an extrusion device comprising:

[0005] A housing having a receiving space therein, through which the consumables can pass;

[0006] The cutting mechanism comprises a gear rack assembly and a blade, wherein the gear rack assembly is connected to the blade, and the gear rack assembly can drive the blade to move in a straight line direction to cut off the consumable material.

[0007] Furthermore, the gear rack assembly includes an active rack, a reduction gear set and a cutter rack, the active rack is connected to the housing, the reduction gear set is respectively meshed with the active rack and the cutter rack, and the blade is connected to the cutter rack; after the active rack is subjected to force, it is meshed and transmitted through the reduction gear set to drive the cutter rack to move, thereby driving the blade to move.

[0008] Furthermore, the reduction gear group includes a rotating shaft and a coaxially arranged large reduction gear and a small reduction gear, the diameter of the large reduction gear is larger than the diameter of the small reduction gear, the rotating shaft is fixedly connected to the housing, and the large reduction gear and the small reduction gear are sleeved on the rotating shaft; the active rack is meshed with the large reduction gear, the cutter rack is meshed with the small reduction gear, and the large reduction gear rotates synchronously with the small reduction gear.

[0009] Furthermore, the gear rack assembly includes an active rack, an acceleration gear set and a cutter rack, the active rack is connected to the housing, the gear set is respectively meshed with the active rack and the cutter rack, and the blade is connected to the cutter rack; after the active rack is subjected to force, it is meshed and transmitted through the acceleration gear set to drive the cutter rack to move, thereby driving the blade to move.

[0010] Furthermore, the acceleration gear group includes a rotating shaft and a coaxially arranged large acceleration gear and a small acceleration gear, the diameter of the large acceleration gear is larger than the diameter of the small acceleration gear, the rotating shaft is fixedly connected to the housing, and the large acceleration gear and the small acceleration gear are sleeved on the rotating shaft; the active rack is meshed with the small acceleration gear, the cutter rack is meshed with the large acceleration gear, and the large acceleration gear rotates synchronously with the small acceleration gear.

[0011] Furthermore, the gear rack assembly includes an active rack, a same-speed gear set and a cutter rack, the active rack is connected to the housing, the gear set is respectively meshed with the active rack and the cutter rack, and the blade is connected to the cutter rack; after the active rack is subjected to force, it is meshed and transmitted through the same-speed gear set to drive the cutter rack to move, thereby driving the blade to move.

[0012] Further, the same-speed gear set includes a rotating shaft and two coaxially arranged gears, the two gears have the same diameter, the rotating shaft is fixedly connected to the housing, and the two gears are sleeved on the rotating shaft;

[0013] The active rack is meshed with any one of the two gears, the cutter rack is meshed with the other gear, and the two gears rotate synchronously.

[0014] Furthermore, the cutting mechanism further comprises an elastic member, which is connected to the active rack and is used to provide a thrust to the active rack away from the consumables, so that the blade returns to an initial position; and / or,

[0015] The elastic member abuts against the cutter rack to provide a thrust to the cutter rack away from the consumable material, so that the blade returns to an initial position; and / or,

[0016] The elastic member is arranged on the gear set and is used for providing a rotation force to the gear set so that the blade returns to an initial position.

[0017] Furthermore, a limiting structure is provided at one end of the active rack close to the consumable material, one end of the elastic member abuts against the bottom of the limiting structure, and the other end abuts against the shell.

[0018] Furthermore, a limiting groove is provided, wherein the elastic member is at least partially located in the limiting groove, and the limiting groove is used to limit the deformation direction of the elastic member.

[0019] Furthermore, the shell has a first through hole, and the active rack can pass through the first through hole; an end cover is provided at one end of the active rack away from the consumable, and the end cover can be clamped with the edge of the first through hole; the elastic member is wound around the active rack, and one end of the elastic member abuts against the end cover, and the other end abuts against the shell.

[0020] Furthermore, a limiting column is provided on at least one side of the shell and the active rack, and a slideway cooperating with the limiting column is provided on the other side of the shell and the active rack. The limiting column abuts against the slideway and slides in the slideway so that the active rack slides relative to the shell.

[0021] Furthermore, the extrusion device comprises a position detection device for detecting the moving position of the blade.

[0022] Furthermore, the cutter rack includes a clearance groove, and the position detection device is installed in the clearance groove. When the blade moves to a position for cutting the consumable material, the position detection device is triggered.

[0023] Furthermore, the position detection device is arranged on a side of the housing corresponding to the active rack, and when the blade moves to a position for cutting off the consumable material, the active rack triggers the position detection device.

[0024] Furthermore, the gear group is configured to be one or more, and the multiple gear groups are arranged in parallel between the active rack and the cutter rack; and the large gear of each gear group is meshed with the small gear of another gear group, and the small gear of each gear group is meshed with the large gear of another gear group.

[0025] Further, the acceleration gear group is configured to be one or more, and the multiple acceleration gear groups are arranged parallel to each other between the active rack and the cutter rack; and the acceleration large gear of each acceleration gear group is meshed with the acceleration small gear of another acceleration gear group, and the acceleration small gear of each acceleration gear group is meshed with the acceleration large gear of another acceleration gear group.

[0026] Furthermore, the same-speed gear set is provided as one or more, and the multiple same-speed gear sets are arranged in parallel between the active rack and the cutter rack; and a gear in each of the same-speed gear sets is meshed with a gear in the next same-speed gear set.

[0027] Furthermore, the shell includes a front shell and a rear shell, the front shell is fixedly connected to the rear shell; the front shell has a mounting hole, and the mounting hole is used to monitor the working status of the cutting mechanism; and / or the extrusion device also includes a cover plate, and the cover plate is used to cover the mounting hole.

[0028] Furthermore, the cover plate is configured as a transparent plate with transparency.

[0029] Furthermore, the movement direction of the blade is perpendicular to the travel direction of the consumables, and the blade edge is a flat blade or an oblique blade.

[0030] In another embodiment, a 3D printing device includes a housing and the extrusion device described above, wherein the extrusion device is accommodated in the housing.

[0031] Furthermore, the housing is provided with a second through hole, and the active rack can pass through the second through hole to be connected to the outside.

[0032] Further, the end cover can pass through the second through hole; or, the end cover can be engaged with an edge of the second through hole.

[0033] Furthermore, the 3D printing device also includes a stopper, which is arranged on the movement path of the extrusion device. When the extrusion device moves along the movement path, the stopper presses the gear rack assembly to drive the blade to move in a direction close to the consumable.

[0034] Based on the above description, those skilled in the art can understand that in the above technical solution of the utility model, a cutting mechanism is added in the extruder, and the gear rack assembly of the cutting mechanism drives the blade to move to cut the consumables. The utility model effectively avoids the problem that the 3D printing device is prone to wire drawing, clogging the print head or polluting the printing device when the consumables are directly ejected when the consumables are replaced. It is convenient for operators to replace consumables, has a simple structure, and is relatively easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the utility model, some embodiments of the utility model will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the same figure number indicates the same or similar parts or components in different drawings; the drawings of the utility model are not necessarily drawn to scale. In the drawings:

[0036] Figure 1 is a front upper isometric view of a 3D printing device in some embodiments of the present invention;

[0037] Figure 2 yes Figure 1Front view of the 3D printing device;

[0038] Figure 3 yes Figure 1 Exploded diagram of the structure of the 3D printing equipment;

[0039] Figure 4 yes Figure 1 Partial structural diagram of 3D printing equipment;

[0040] Figure 5 yes Figure 3 The upper right isometric view of the middle active rack;

[0041] Figure 6 yes Figure 3 The upper left isometric view of the middle active rack;

[0042] Figure 7 yes Figure 3 Schematic diagram of the structure of the middle reduction gear;

[0043] Figure 8 yes Figure 3 The structural diagram of the gear set;

[0044] Fig. 9 yes Figure 3 A schematic structural diagram of the middle blade being in the first position;

[0045] Fig.10 yes Figure 3 A schematic diagram of the structure of the middle blade being in the second position;

[0046] Fig.11 It is a schematic diagram of the overall structure of the 3D printing device in some embodiments of the present utility model. DETAILED DESCRIPTION

[0047] It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention, and the embodiments are intended to explain the technical principles of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should still fall within the protection scope of the present invention.

[0048] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0050] Refer to the following Figures 1 to 11 The structure of the 3D printing device in some embodiments of the present invention is described in detail. Figure 1 is a front upper isometric view of a 3D printing device in some embodiments of the present invention; Figure 2 yes Figure 1 Front view of the 3D printing device; Figure 3 yes Figure 1 Exploded diagram of the structure of the 3D printing equipment; Figure 4 yes Figure 1 Partial structural diagram of 3D printing equipment; Figure 5 yes Figure 3 The upper right isometric view of the middle active rack; Figure 6 yes Figure 3 The upper left isometric view of the middle active rack; Figure 7 yes Figure 3 Schematic diagram of the structure of the middle reduction gear; Figure 8 yes Figure 3 The structural diagram of the gear set; Fig. 9 yes Figure 3 A schematic structural diagram of the middle blade being in the first position; Fig.10 yes Figure 3 A schematic diagram of the structure of the middle blade being in the second position; Fig.11 It is a schematic diagram of the overall structure of the 3D printing device in some embodiments of the present utility model.

[0051] It should be noted that, for the convenience of description and to enable those skilled in the art to quickly understand the technical solution of the present invention, the following text only describes the technical features that are directly or indirectly related to the technical problem and / or technical concept to be solved by the present invention, and does not describe the technical features that are less related to the technical problem and / or technical concept to be solved by the present invention. Since the technical features with a lesser degree of correlation are common knowledge in the art, even if the present invention does not describe the features with a lesser degree of correlation, it will not lead to insufficient disclosure of the present invention.

[0052] like Figures 1 to 8 As shown, in some embodiments of the utility model, an extrusion device 1 is provided, and the extrusion device 1 is used to extrude the consumables in the 3D printing device 100 and convey them to the print head 2. The extrusion device 1 includes a shell 11, a consumable clamping mechanism 12 and a cutting mechanism 13. A accommodating space is provided in the shell 11, and the accommodating space has a consumable channel for the consumables to pass through and a cutting channel for cutting the consumables, and the cutting channel extends from one side of the consumable channel along its width direction to the other side. The consumable clamping mechanism 12 is used to clamp the consumables in the consumable channel and convey them toward the print head 2. The cutting mechanism 13 is located between the consumable clamping mechanism 12 and the print head 2, and the cutting mechanism 13 is used to cut off the unmelted consumables in the extrusion device 1, so that the unmelted consumables can exit the extrusion device 1, so that the operator can replace the consumables.

[0053] The housing 11 includes a front housing 111 and a rear housing 112, the front housing 111 and the rear housing 112 are fixedly connected, there is a receiving space between the front housing 111 and the rear housing 112, and the cutting mechanism 13 is installed in the receiving space of the housing 11. The fixed connection method can be set to be connected by screw holes or riveted.

[0054] In some other embodiments of the present invention, a mounting hole 1111 is provided on the front housing 111 . The mounting hole 1111 is used to monitor the working state of the cutting mechanism 13 ; meanwhile, it is also convenient for inspecting and repairing the cutting mechanism 13 .

[0055] In some other embodiments of the present invention, the extrusion device 1 further comprises a cover plate 113, which is mounted on the front housing 111 and is used to cover the mounting hole 1111. The cover plate 113 is detachably connected to the front housing 111, so that the operator can replace the blade 132 or inspect the cutting mechanism 13.

[0056] Optionally, the cover plate 113 can be set as a transparent plate with transparency, so that the operator can observe the working state of the cutting mechanism 13 through the cover plate 113. The transparent plate has a certain degree of transparency and can be set to be completely transparent or semi-transparent. The specific transparency can be set according to actual needs and is not specifically limited here.

[0057] The consumable material clamping mechanism 12 includes a driving component 121 and a clamping component 122 .

[0058] The driving assembly 121 includes a motor 1211 and an output shaft 1212. The motor 1211 can be arranged inside the housing 11 of the extrusion device 1, and the output shaft 1212 is directly connected to the clamping assembly 122. Alternatively, the motor 1211 can be arranged outside the housing 11 of the extrusion device 1. Specifically, the motor 1211 is arranged outside the housing 11 of the extrusion device 1, and a hole structure is arranged on the rear housing 112, and the output shaft 1212 can pass through the hole structure to drive the clamping assembly 122.

[0059] In some other embodiments of the present invention, the extrusion device 1 further comprises a mounting seat 114 , which is used to connect the motor 1211 to the extrusion device 1 , and the output shaft 1212 of the motor 1211 can pass through the mounting seat 114 .

[0060] Preferably, the motor 1211 can be configured as a stepping motor.

[0061] In other embodiments of the present invention, the driving assembly 121 further includes a motor gear 1213 , the output shaft 1212 is drivingly connected to the motor gear 1213 , and the motor gear 1213 is connected to the clamping assembly 122 .

[0062] The clamping assembly 122 includes a first gear 1221, a second gear, a first fixed rod and a second fixed rod (not shown in the figure), the first gear 1221 is sleeved on the first fixed rod, and the second gear is sleeved on the second fixed rod. The first gear 1221 is connected to the output shaft 1212, and the motor 1211 is used to drive the output shaft 1212 to drive the first gear 1221 to rotate. Alternatively, the first gear 1221 is meshed with the motor gear 1213, so that the motor gear 1213 can drive the first gear 1221 to rotate.

[0063] The second fixing rod is fixedly connected to the housing 11, and the second gear is sleeved on the second fixing rod. The second gear meshes with the first gear 1221, so that when the motor 1211 drives the first gear 1221 to rotate, the first gear 1221 meshes with the second gear to rotate.

[0064] The clamping assembly 122 also includes a feeding wheel 123, which is used to clamp the consumables. The feeding wheel 123 includes a first feeding wheel 1231 and a second feeding wheel 1232. The first feeding wheel 1231 is coaxially arranged with the first gear 1221, and the second feeding wheel 1232 is coaxially arranged with the second gear, so that the first gear 1221 can drive the first feeding wheel 1231 and the second feeding wheel 1232 to move in the consumable channel along the front-rear direction of the housing 11, so as to adjust the consumables to a specified position, so as to transport the consumables to the print head 2.

[0065] The cutting mechanism 13 is installed in the housing 11. The cutting mechanism 13 includes a gear rack assembly 131 and a blade 132. The gear rack assembly 131 is connected to the blade 132, and the gear rack assembly 131 can drive the blade 132 to reciprocate in the cutting channel along its guide direction.

[0066] The direction in which the blade 132 cuts the consumables is along a straight line. Specifically, the movement direction of the blade 132 is perpendicular to the travel direction of the consumables, that is, the cutting direction of the blade 132 is relatively perpendicular to the consumables. Alternatively, the cutting direction of the blade 132 cuts the consumables obliquely. That is, the cutting channel can be relatively perpendicular to the consumable channel, or can be obliquely set to the consumable channel.

[0067] Optionally, the blade portion of the blade 132 is a flat blade or a bevel blade.

[0068] In an optional embodiment, the movement direction of the blade 132 is perpendicular to the travel direction of the consumables, and the cutting edge of the blade 132 is a flat blade, which is arranged at one end of the blade 132 away from the cutter rack 133; when cutting the consumables, the cutting edge of the blade 132 faces the consumables.

[0069] In an optional embodiment, the movement direction of the blade 132 is perpendicular to the travel direction of the consumables, and the blade portion of the blade 132 is an oblique blade, which is arranged on the side of the blade 132 facing the shell 11; when cutting the consumables, the blade portion cuts the consumables obliquely, and gradually changes from point contact to line contact, thereby effectively protecting the blade portion from damage.

[0070] The gear rack assembly 131 includes an active rack 1311, a gear set 1312 and a cutter rack 133. The active rack 1311 is connected to the housing 11. The gear set 1312 is meshed with the active rack 1311 and the cutter rack 133 respectively. The blade 132 is connected to the cutter rack 133. After receiving force, the active rack 1311 can mesh with the gear set 1312 to drive the cutter rack 133 to move, thereby driving the blade 132 to move in the cutting channel.

[0071] In order to ensure that the active rack 1311 is evenly stressed and has a larger contact surface, the active rack 1311 is preferably arranged to be placed horizontally. In this embodiment, the cutter rack 133 can be arranged to be parallel to the active rack 1311, or it can be arranged to be non-parallel to the active rack 1311. Specifically, when the cutter rack 133 is parallel to the active rack 1311, the cutter rack 133 is located above the active rack 1311 and is arranged vertically relative to the consumables. Figure 4 When the cutter rack 133 is not parallel to the active rack 1311, the cutter rack 133 is tilted relative to the consumables.

[0072] The active rack 1311 may be configured to directly mesh with the gear set 1312 , or may be configured to mesh with the gear set 1312 after being moved to a position meshing with the gear set 1312 after receiving a force.

[0073] It should be noted that in this embodiment, the operator can directly push the active rack 1311 to apply a thrust to the active rack 1311 so that the blade 132 cuts the consumables. Alternatively, a pushing device (not shown in the figure) can be added to apply pressure / collision to the active rack 1311 so that the cutting device 13 cuts the consumables.

[0074] A limiting column 13112 is provided on at least one side of the housing 11 and the active rack 1311, and a slideway matched with the limiting column 13112 is provided on the other side of the housing 11 and the active rack 1311. The limiting column 13112 abuts against the slideway and slides in the slideway, so that the active rack 1311 slides relative to the housing 5. The cross section of the limiting column 13112 can be set to be square or circular.

[0075] The reduction gear set 1312 includes a rotating shaft 13123 and a coaxially arranged reduction gear 13121 and a reduction pinion 13122. The rotating shaft 13123 is fixedly connected to the housing 11, and the reduction gear 13121 and the reduction pinion 13122 are sequentially sleeved on the rotating shaft 13123. The active rack 1311 is meshed with the reduction gear 13121, and the cutter rack 133 is meshed with the reduction pinion 13122. The reduction gear 13121 and the reduction pinion 13122 rotate synchronously to convert the relatively small thrust at the active rack 1311 into a relatively large thrust at the cutter rack 133, so that the blade 132 moves to the cutting position of the blade 132 at a suitable speed to cut the consumables. Among them, the diameter of the large gear 13121 is greater than the diameter of the pinion 13122.

[0076] It should be noted that in order to ensure that the cutting mechanism 13 can completely cut off the consumables, a relatively large thrust is usually applied to the active rack 1311. In order to reduce / save the thrust on the active rack 1311, a reduction gear set 1312 is added in the utility model. The reduction gear set 1312 converts the large thrust on the active rack 1311 into a relatively small driving force, driving the cutter gear 133 to cut off the consumables, thereby ensuring that the cutting mechanism 13 can cut off the consumables while enabling the equipment to operate stably for a long time.

[0077] The reduction gear set 1312 includes a rotating shaft 13123 and a coaxially arranged large reduction gear 13121 and a small reduction gear 13122. The diameter of the large reduction gear 13121 is larger than the diameter of the small reduction gear 13122. The rotating shaft 13123 is fixedly connected to the housing 11, and the large reduction gear 13121 and the small reduction gear 13122 are sleeved on the rotating shaft 13123; the active rack 1311 is meshed with the large reduction gear 13122, and the cutter rack 133 is meshed with the small reduction gear 13122, and the large reduction gear 13121 and the small reduction gear 13122 rotate synchronously, so that the reduction gear set 1312 applies the force exerted on the active rack 1311 to the cutter rack 133 after deceleration, so as to prevent the blade 132 from being subjected to a large force and causing damage to other components inside the device.

[0078] In an optional embodiment, the reduction gear set 1312 can be provided as one or more. By adding multiple reduction gear sets 1312, the multiple reduction gear sets 1312 are matched with the active rack 1311 and the cutter rack 133 respectively, and the force received by the active gear 1311 is transformed to a great extent, further ensuring that the cutting mechanism 13 can operate stably.

[0079] Specifically, a plurality of reduction gear sets 1312 are arranged in parallel between the driving rack 1311 and the cutter rack 133. Each reduction gear set 1312 is fixedly connected to the housing 5 via a rotating shaft 13123, and the reduction gear 13121 of each reduction gear set 1312 is meshed with the reduction pinion 13122 of another reduction gear set 1312, and the reduction pinion 13122 of each reduction gear set 1312 is meshed with the reduction gear 13121 of another reduction gear set 1312. The large reduction gear 13121 of the first gear group close to the active rack 1311 is meshed with the active rack 1311, and the small reduction gear 13122 is meshed with the cutter rack 133; the large reduction gear 13121 of the second gear group meshed with the first gear group cooperates with the small reduction gear 13122 and the cutter rack 133 of the first gear group, and the small reduction gear 13122 of the second reduction gear is meshed with the large reduction gear 13121 and the active gear 1311 of the first gear group, and so on. The other reduction gear groups 1312 also cooperate to drive the cutter rack 133 in the above manner, which will not be repeated here.

[0080] In an optional embodiment, the gear rack assembly 131 includes an active rack 1311, an acceleration gear set and a cutter rack 133, the active rack 1311 is connected to the housing 11, the acceleration gear set is respectively meshed with the active rack 1311 and the cutter rack 133, and the blade 132 is connected to the cutter rack 133;

[0081] After receiving force, the active rack 1311 is meshed and transmitted through the acceleration gear set to drive the cutter rack 133 to move, thereby driving the blade 132 to move.

[0082] The acceleration gear set 131 includes a rotating shaft 13123 and a coaxially arranged large acceleration gear and a small acceleration gear. The diameter of the large acceleration gear is larger than the diameter of the small acceleration gear. The rotating shaft 13123 is fixedly connected to the shell 11, and the large acceleration gear and the small acceleration gear are sleeved on the rotating shaft 13123; the active rack 1311 is meshed with the small acceleration gear, and the cutter rack 133 is meshed with the large acceleration gear, and the large acceleration gear and the small acceleration gear rotate synchronously, so that the acceleration gear set applies the force exerted on the active rack 1311 to the cutter rack 133 after acceleration, so that the blade 132 has sufficient cutting force, can quickly cut off the consumables, improve the overall efficiency of the equipment, and effectively avoid the consumables sticking to the blade 132 due to the slow cutting speed of the blade 132.

[0083] Among them, the acceleration gear set can be set to one or more, and multiple acceleration gear sets are arranged in parallel between the active rack 1311 and the cutter rack 133; and the acceleration large gear of each acceleration gear set is meshed with the acceleration small gear of another acceleration gear set, and the acceleration small gear of each acceleration gear set is meshed with the acceleration large gear of another acceleration gear set.

[0084] Specifically, a plurality of acceleration gear sets are arranged parallel to each other between the active rack 1311 and the cutter rack 133. Each acceleration gear set is fixedly connected to the housing 5 through the rotating shaft 13123, and the acceleration gear of each acceleration gear set is meshed with the acceleration pinion of another acceleration gear set, and the acceleration pinion of each acceleration gear set is meshed with the acceleration gear of another acceleration gear set. The acceleration gear of the first gear set close to the active rack is meshed with the active rack 1311, and the acceleration pinion is meshed with the cutter rack 133; the acceleration gear of the second gear set meshed with the first gear set cooperates with the acceleration pinion of the first gear set and the cutter rack 133, and the acceleration pinion of the second acceleration gear is meshed with the acceleration gear of the first gear set and the active gear 1311, and so on. Other acceleration gear sets also cooperate to drive the cutter rack 133 in the above manner, which will not be described in detail here.

[0085] In an optional embodiment, the gear rack assembly 131 includes an active rack 1311, a same-speed gear set and a cutter rack 133. The active rack 1311 is connected to the housing 11, and the same-speed gear set is respectively meshed with the active rack 1311 and the cutter rack 133, and the blade 132 is connected to the cutter rack 133; after the active rack 1311 is subjected to force, it is meshed and transmitted through the same-speed gear set to drive the cutter rack 133 to move, thereby driving the blade 132 to move.

[0086] The same-speed gear set includes a rotating shaft 13123 and two coaxially arranged gears, the two gears have the same diameter, the rotating shaft 13123 is fixedly connected to the shell 11, and the two gears are sleeved on the rotating shaft 13123; the active rack 1311 is meshed with any one of the two gears, and the cutter rack 133 is meshed with the other gear, and the two gears rotate synchronously to apply the force exerted on the active rack 1311 to the cutter rack 133 after acceleration, so that the blade 132 can cut the consumables.

[0087] Among them, the same-speed gear set can be set to one or more, and multiple same-speed gear sets are arranged in parallel between the active rack 1311 and the cutter rack 133; and a gear in each same-speed gear set is meshed with a gear in the next same-speed gear set.

[0088] Specifically, a plurality of same-speed gear sets are arranged in parallel between the active rack 1311 and the cutter rack 133. Each of the same-speed gear sets is fixedly connected to the housing 5 via the rotating shaft 13123, and one gear in each of the same-speed gear sets meshes with one gear in another same-speed gear set, and one gear in another same-speed gear set meshes with one gear in the next same-speed gear set. One gear of the first same-speed gear set close to the active rack meshes with the active rack 1311, and another gear meshes with the cutter rack 133; one gear of the second gear set meshed with the first same-speed gear set cooperates with the gear of the first gear set and the cutter rack 133, and another gear of the second acceleration gear meshes with the gear of the first gear set and the active gear 1311, and so on. Other same-speed gear sets also cooperate to drive the cutter rack 133 in the above manner, which will not be described in detail here.

[0089] The blade 132 and the cutter rack 133 are integrally formed, or the blade 132 and the cutter rack 133 are fixedly connected.

[0090] The blade 132 is made of metal or alloy material. Moreover, those skilled in the art will appreciate that the surface of the blade 132 may be coated with an anti-adhesion coating to prevent the contaminants from contaminating the blade 132 .

[0091] The cutting mechanism 13 further includes an elastic member 134, a limiting groove 13111 is provided at one end of the active rack 1311 close to the consumables channel, and the elastic member 134 is connected to the active rack 1311 to provide a thrust to the active rack 1311 away from the consumables, so that the blade 132 returns to the initial position; and / or,

[0092] The elastic member 134 abuts against the cutter rack 133 to provide a thrust to the cutter rack 133 away from the consumables, so that the blade 132 returns to the initial position; and / or,

[0093] The elastic member 134 is disposed on the gear set 1312 for providing a rotational force to the gear set 1312 so that the blade 132 returns to an initial position.

[0094] In one embodiment, the elastic member 134 is connected to the active rack 1311, and the active rack 1311 pushes the cutter rack 133 so that the blade 132 compresses the elastic member 134 when cutting the consumables; after the blade 132 cuts the consumables, the elastic force of the elastic member 134 pushes the active rack 1311 back, so that the blade 132 returns to its initial position.

[0095] In another embodiment, the elastic member 134 is connected to the cutter rack 133, and the active rack 1311 pushes the cutter rack 133 so that the blade 132 compresses the elastic member 134 when cutting the consumables; after the blade 132 cuts the consumables, the elastic force of the elastic member 134 pushes the cutter rack 133 back, thereby restoring the blade 132 to its initial position.

[0096] In another embodiment, the elastic member 134 is a torsion spring or a coil spring, which is disposed on the large gear 13121 and / or the small gear 13122 of the gear set 1312. When the active rack 1311 pushes the cutter rack 133 so that the blade 132 cuts the consumables, the large gear 13121 and the small gear 13122 rotate, thereby driving the compressed elastic member. After the blade 132 cuts the consumables, the elastic force of the elastic member 134 pushes the large gear 13121 and / or the small gear 13122 to rotate, thereby causing the blade 132 to return to its initial position.

[0097] In other embodiments of the present invention, a limiting structure is provided at one end of the active rack 1311 close to the consumables, one end of the elastic member 134 abuts against the limiting structure, and the other end abuts against the housing 11. The limiting structure is used to connect one end of the elastic member 134 to the active rack 1311.

[0098] In other embodiments of the present invention, the active rack 1311 further includes a limiting groove 13111, and the elastic member 134 is at least partially located in the limiting groove 13111, and the limiting groove 13111 is used to limit the deformation direction of the elastic member 134. Specifically, the limiting structure is located at the bottom of the limiting groove 13111, and the groove wall of the limiting groove 13111 can guide the deformation direction of the elastic member 134, so that the elastic member 134 can stretch / contract along the groove depth direction of the limiting groove 13111, so as to avoid deformation of all parts of the elastic member 134 after being subjected to force, and uneven force direction, which leads to insufficient resilience of the elastic member 134 in the cutting direction, and cannot completely drive the active rack 1311 to return to the initial position.

[0099] In other embodiments of the utility model, the housing 11 has a first through hole 115, and the active rack 1311 can pass through the first through hole 115. An end cap 13113 is provided at one end of the active rack 1311 away from the consumables, and the end cap 13113 can be clamped with the edge of the first through hole 115; the elastic member 134 is wound around the active rack 1311, and one end of the elastic member 134 abuts against the end cap 13113, and the other end abuts against the housing 11.

[0100] Optionally, the limiting groove 13111 can be configured as a groove structure.

[0101] Furthermore, an arc groove is provided on the end cover 13113, so that the end cover 13113 is subjected to uniform force, and then a thrust is applied thereto through the collision of the pushing device with the arc groove, thereby ensuring that the active rack 1311 can be pushed.

[0102] Optionally, the elastic member 134 may be configured as a torsion spring, a spring, a leaf spring or a disc spring.

[0103] In other embodiments of the present invention, the extrusion device 1 includes a position detection device 135 for detecting the moving position of the blade 132 .

[0104] In other embodiments of the present invention, the cutter rack 133 includes a clearance groove 1331, and the position detection device 135 is installed in the clearance groove 1331. When the blade 132 moves to the position for cutting the consumables, the position detection device 135 is triggered.

[0105] In other embodiments of the utility model, the position detection device 132 is arranged on the side of the housing 11 corresponding to the active rack 1311, and when the blade 132 moves to the position of cutting the consumables, the active rack 1311 triggers the position detection device 135. If the position detection device 132 is arranged on the side of the housing 11 corresponding to the active rack, when the active rack 1311 is pressed and pushed forward until its end cover 13113 contacts the position detection device 135, thereby triggering the position detection device 135 to send a detection signal, it indicates that the blade 132 has moved to the position of cutting the consumables.

[0106] The position detection device 135 can be set as a travel switch, a photoelectric sensor, a micro switch or other devices that can be used to detect the moving distance of the cutter rack 133. Of course, those skilled in the art can also set the position detection device 135 as other devices that can detect the position of the cutter rack 133 as needed.

[0107] Preferably, the present invention sets the position detection device 135 as a travel switch, and the travel switch is triggered when the cutter rack 133 moves to the position where the consumable material is cut. When the cutter rack 133 leaves the cutting position, the travel switch is converted from a triggered state to a non-triggered state.

[0108] Refer to the following Fig. 9 and Fig.10 , to briefly explain the working principle of the cutting mechanism 13:

[0109] like Fig. 9As shown, a thrust is applied to the active rack 1311 so that the active rack 1311 engages with the large gear 13121 for transmission, so that the small gear 13122 and the large gear 13121 rotate coaxially and synchronously, and the small gear 13122 engages with the cutter rack 133, thereby driving the blade 132 to move to the first position, and the position detection device 135 detects the position information of the cutter rack 133 to determine that the cutting mechanism 13 completes the cutting of the consumables.

[0110] like Fig.10 As shown, when the driving rack 1311 stops being pushed, since the driving rack 1311 is in contact with the shell 11 through the elastic member 134, the elastic member 134 applies a reverse thrust to the driving rack 1311, so that the driving rack 1311 moves to the side away from the consumables, and the large gear 13121 engages with the driving rack 1311 to drive the small gear 13122 and the cutter rack 133 to move, thereby causing the blade 132 to move to the second position, so that the cutting mechanism 13 returns to the initial position.

[0111] In other embodiments of the utility model, a 3D printing device 100 is provided, comprising the extrusion device 1, the print head 2, the heating component 3 and the heat dissipation component 4 described above. The extrusion device 1 is used to extrude the consumable material to the print head 2, and the print head 2 is used to eject the consumable material. The heating component 3 is installed on the print head 2, and is used to melt the consumable material and eject it through the print head 2. The heat dissipation component 4 is arranged between the extrusion device 1 and the print head 2, and is used to dissipate the heat of the print head 2 to prevent the heat at the end of the print head 2 from being transferred to the extrusion device 1 and causing damage to the internal parts of the device.

[0112] The heating component 3 is installed in cooperation with the print head 2 , and the heating component 3 is used to melt the consumable material to put it in a molten state so as to be ejected through the print head 2 .

[0113] The heat dissipation component 4 is used to cool the 3D printing device 100 to prevent the heat at the end of the print head 2 from being transferred to the extruder 1, causing damage to the internal parts of the extruder 1. The heat dissipation component 4 includes a plurality of heat sinks 41 and a fan. The plurality of heat sinks 41 are arranged in parallel, and the fan is installed on one side of the plurality of heat sinks 41 to blow out the hot air on the side of the heat sink 41.

[0114] like Fig.11 As shown, in other embodiments of the present invention, the 3D printing device 100 also includes a housing 5 having a housing cavity, and the extrusion device 1, the print head 2, the heating component 3 and the heat dissipation component 4 are accommodated in the housing 5.

[0115] The housing 5 is provided with a second through hole 51 , through which the active rack 1311 can pass to connect with the outside, and the end cover 13113 can pass through the second through hole 51 , so that the active rack 1311 can drive the blade 132 to move to the maximum extent.

[0116] In other embodiments of the present invention, the end cover 13113 disposed at one end of the active rack 1311 can be engaged with the second through hole 51 to expose the active rack 1311 outside the housing 5 .

[0117] In other embodiments of the utility model, the 3D printing device 100 further includes a bracket 6, one end of the bracket 6 is connected to the heat dissipation component 4, and the other end is connected to the housing 5. A guide port 61 is provided on the bracket 6 for guiding the consumables to the print head 2. The bracket 6 is fixedly connected to the housing 5 and the heat dissipation component 4, respectively. Optionally, the fixed connection method is a screw hole connection.

[0118] In one embodiment, the 3D printing device also includes a stopper, which is arranged on the movement path of the extruder 1. When the extruder 1 moves along the movement path, the extruder 1 collides with the stopper, so that the stopper presses the rack and pinion assembly 131, and the pressure drives the blade 132 to move in a direction close to the consumable.

[0119] Although not shown in the figures, in other embodiments of the present invention, the casing 5 has an exhaust port, which is connected to the fan to exhaust hot air to the outside of the casing 5, thereby cooling the extrusion device 1.

[0120] In other embodiments of the present invention, the 3D printing device 100 further includes a door body 7 , which is used to close the housing 5 . The door body 7 is pivotally connected to the housing 5 so that an operator can open / close the housing 5 .

[0121] The present application also provides the following embodiments:

[0122] Embodiment 1, an extrusion device 1, comprising: a shell 11, which has a accommodating space, and consumables can pass through the accommodating space; a cutting mechanism 13, which includes a gear rack assembly 131 and a blade 132, the gear rack assembly 131 is connected to the blade 132, and the gear rack assembly 131 can drive the blade 132 to move in a direction close to the consumables to cut the consumables.

[0123] Embodiment 2, on the basis of embodiment 1, the gear rack assembly 131 includes an active rack 1311, a reduction gear set 1312 and a cutter rack 133, the active rack 1311 is connected to the housing 11, the reduction gear set 1312 is respectively meshed with the active rack 1311 and the cutter rack 133, and the blade 132 is connected to the cutter rack 133; after the active rack 1311 is subjected to force, it is meshed and transmitted through the gear set 1312 to drive the cutter rack 133 to move, thereby driving the blade 132 to move.

[0124] Embodiment 3, on the basis of embodiment 2, the reduction gear set 1312 includes a rotating shaft 13123 and a coaxially arranged large reduction gear 13121 and a small reduction gear 13122, the diameter of the large reduction gear 13121 is larger than the diameter of the small reduction gear 13122, the rotating shaft 13123 is fixedly connected to the housing 11, and the large reduction gear 13121 and the small reduction gear 13122 are sleeved on the rotating shaft 13123; the active rack 1311 is meshed with the large reduction gear 13122, the cutter rack 133 is meshed with the small reduction gear 13122, and the large reduction gear 13121 and the small reduction gear 13122 rotate synchronously.

[0125] Embodiment 4, on the basis of embodiment 1, the gear rack assembly 131 includes an active rack 1311, an acceleration gear set and a cutter rack 133, the active rack 1311 is connected to the housing 11, the acceleration gear set is respectively meshed with the active rack 1311 and the cutter rack 133, and the blade 132 is connected to the cutter rack 133; after the active rack 1311 is subjected to force, it is meshed and transmitted through the acceleration gear set to drive the cutter rack 133 to move, thereby driving the blade 132 to move.

[0126] Embodiment 5, on the basis of embodiment 4, the acceleration gear set 1312 includes a rotating shaft 13123 and a coaxially arranged large acceleration gear and a small acceleration gear, the diameter of the large acceleration gear is larger than the diameter of the small acceleration gear, the rotating shaft 13123 is fixedly connected to the housing 11, and the large acceleration gear and the small acceleration gear are sleeved on the rotating shaft 13123; the active rack 1311 is meshed with the small acceleration gear, the cutter rack 133 is meshed with the large acceleration gear, and the large acceleration gear and the small acceleration gear rotate synchronously.

[0127] Embodiment 6, on the basis of embodiment 1, the gear rack assembly 131 includes an active rack 1311, a same-speed gear set and a cutter rack 133, the active rack 1311 is connected to the housing 11, the same-speed gear set is respectively meshed with the active rack 1311 and the cutter rack 133, and the blade 132 is connected to the cutter rack 133;

[0128] After receiving force, the active rack 1311 is meshed and driven by a gear set at the same speed to drive the cutter rack 133 to move, thereby driving the blade 132 to move.

[0129] Embodiment 7, on the basis of embodiment 6, the same-speed gear set includes a rotating shaft 13123 and two gears arranged coaxially with 13123, the two gears have the same diameter, the rotating shaft 13123 is fixedly connected to the housing, and the two gears are sleeved on the rotating shaft 13123; the active rack 1311 is meshed with any one of the two gears, the cutter rack 133 is meshed with the other gear, and the two gears rotate synchronously.

[0130] Embodiment 8, based on embodiments 1 to 7, the cutting mechanism 13 further includes an elastic member 134, the elastic member 134 is connected to the active rack 1311, and is used to provide a thrust to the active rack 1311 away from the consumables, so that the blade 132 returns to the initial position; and / or,

[0131] The elastic member 134 abuts against the cutter rack 133 to provide a thrust to the cutter rack 133 away from the consumables, so that the blade 132 returns to the initial position; and / or,

[0132] The elastic member 134 is disposed on the gear set 1312 for providing a rotational force to the gear set 1312 so that the blade 132 returns to an initial position.

[0133] Embodiment 9, based on Embodiment 7, a limiting structure is provided at one end of the active rack 1311 close to the consumables, one end of the elastic member 134 abuts against the limiting structure, and the other end abuts against the housing 11 .

[0134] Embodiment 10, on the basis of embodiment 9, a limiting groove 13111 is provided on the active rack 1311 , the elastic member 134 is at least partially located in the limiting groove 13111 , and the limiting groove 13111 is used to limit the deformation direction of the elastic member 134 .

[0135] Embodiment 11, on the basis of embodiment 8, a first through hole 115 is provided on the housing 11, and the active rack 1311 can pass through the first through hole 115;

[0136] An end cap 13113 is disposed at one end of the active rack 1311 away from the consumables, and the end cap 13113 can be clamped with the edge of the first through hole 115;

[0137] The elastic member 134 is wound around the active rack 1311 , and one end of the elastic member 134 abuts against the end cover 13113 , and the other end abuts against the housing 11 .

[0138] Embodiment 12, based on embodiment 7, a limiting column 13112 is provided on at least one side of the housing 11 and the active rack 1311.

[0139] The other of the housing 11 and the active rack 1311 is provided with a slideway that cooperates with the limiting column 13112.

[0140] The limiting column 13112 abuts against the slideway and slides in the slideway, so that the active rack 1311 slides relative to the housing 11 .

[0141] Embodiment 13, based on embodiment 1, the extrusion device 1 includes a position detection device 135 for detecting the moving position of the blade 132.

[0142] Embodiment 14, based on embodiment 13, the cutter rack 133 includes a clearance groove 1331, and the position detection device 135 is installed in the clearance groove 1331. When the blade 132 moves to the position for cutting the consumables, the position detection device 135 is triggered.

[0143] Embodiment 15, based on embodiment 13, the position detection device 135 is arranged on a side of the housing 11 corresponding to the active rack 1311, and when the blade 132 moves to the position for cutting the consumables, the active rack 1311 causes the position detection device 132 to be triggered.

[0144] Embodiment 16, on the basis of embodiment 3, the reduction gear group 1312 is set to one or more, and the multiple reduction gear groups 1312 are arranged in parallel between the active rack 1311 and the cutter rack 133; and the large reduction gear 13121 of each reduction gear group 1312 is meshed with the small reduction gear 13122 of another reduction gear group 1312, and the small reduction gear 13122 of each reduction gear group 1312 is meshed with the large reduction gear 13121 of another reduction gear group 1312.

[0145] Embodiment 17, on the basis of embodiment 5, the acceleration gear set is set to one or more, and the multiple acceleration gear sets are arranged in parallel between the active rack 1311 and the cutter rack 133; and the acceleration large gear of each acceleration gear set is meshed with the acceleration small gear of another acceleration gear set, and the acceleration small gear of each acceleration gear set is meshed with the acceleration large gear of another acceleration gear set.

[0146] Embodiment 18, on the basis of embodiment 7, the same-speed gear set is set to one or more, and the multiple same-speed gear sets are arranged in parallel between the active rack 1311 and the cutter rack 133; and a gear in each same-speed gear set is meshed with a gear in the next same-speed gear set.

[0147] Embodiment 19, on the basis of Embodiment 1, the shell 11 includes a front shell 111 and a rear shell 112, and the front shell 111 is fixedly connected to the rear shell 112; the front shell 111 has a mounting hole 1111, and the mounting hole 1111 is used to monitor the working status of the cutting mechanism 13; and / or, the extrusion device 1 also includes a cover plate 113, and the cover plate 113 is used to shield the mounting hole 1111.

[0148] Embodiment 20, based on Embodiment 19, the cover plate 113 is configured as a transparent plate with a certain degree of transparency.

[0149] Embodiment 21, based on embodiment 1, the movement direction of the blade 132 is perpendicular to the moving direction of the consumables; the blade portion of the blade 132 is a flat blade or an oblique blade.

[0150] Embodiment 22, a 3D printing device 100, comprising the extrusion device 1 described in any one of Embodiments 1 to 21.

[0151] Embodiment 23, on the basis of embodiment 22, the 3D printing device 100 further includes a housing 5, and a second through hole 51 is provided on the housing 5, and the active rack 1311 can pass through the second through hole 51 to connect with the outside.

[0152] Embodiment 24, on the basis of Embodiment 23, an end cover 13113 is provided at one end of the active rack 1311, and the end cover 13113 can be engaged with the second through hole 51; or, the end cover 13113 can be engaged with the edge of the second through hole 52.

[0153] Example 25. Based on Example 22, the 3D printing device also includes a block, which is arranged on the movement path of the extrusion device 1. When the extrusion device 1 moves along the movement path, the block presses the gear rack assembly 131 to drive the blade 132 to move toward the direction close to the consumable.

[0154] Those skilled in the art can understand that the present invention adds a cutting mechanism 13 in the extruder 1, and enables the gear rack assembly 131 of the cutting mechanism 13 to drive the blade 132 to move, so as to cut the consumables. The present invention effectively avoids the problem that the 3D printing device 100 is prone to clogging the print head 2 when directly withdrawing the consumables when replacing the consumables, and the molten consumables are prone to contaminating the device. The structure is simple and relatively easy to implement.

[0155] So far, the technical solution of the utility model has been described in combination with the above multiple embodiments, but it is easy for those skilled in the art to understand that the protection scope of the utility model is not limited to these specific embodiments. Without departing from the technical principle of the utility model, those skilled in the art can split and combine the technical solutions in the above embodiments, and can also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent replacements, improvements, etc. made within the technical concept and / or technical principle of the utility model will fall within the protection scope of the utility model.

Claims

1. An extrusion device, characterized in that: include: A housing having a receiving space therein, through which the consumables can pass; The cutting mechanism comprises a gear rack assembly and a blade, wherein the gear rack assembly is connected to the blade, and the gear rack assembly can drive the blade to move toward a direction close to the consumable material to cut off the consumable material.

2. The extrusion device according to claim 1, characterized in that The gear rack assembly comprises an active rack, a reduction gear set and a cutter rack, the active rack is connected to the housing, the reduction gear set is respectively meshed with the active rack and the cutter rack, and the blade is connected to the cutter rack; After the driving rack is subjected to force, it is meshed and transmitted through the reduction gear set to drive the cutter rack to move, thereby driving the blade to move.

3. The extrusion device according to claim 2, characterized in that: The reduction gear set comprises a rotating shaft and a large reduction gear and a small reduction gear which are coaxially arranged. The diameter of the large reduction gear is larger than the diameter of the small reduction gear. The rotating shaft is fixedly connected to the housing. The large reduction gear and the small reduction gear are sleeved on the rotating shaft. The active rack is meshed with the large reduction gear, the cutter rack is meshed with the small reduction gear, and the large reduction gear and the small reduction gear rotate synchronously.

4. The extrusion device according to claim 1, characterized in that The gear rack assembly comprises an active rack, an acceleration gear set and a cutter rack, the active rack is connected to the housing, the gear set is respectively meshed with the active rack and the cutter rack, and the blade is connected to the cutter rack; After the active rack is subjected to force, it is meshed and transmitted through the acceleration gear set to drive the cutter rack to move, thereby driving the blade to move.

5. The extrusion device according to claim 4, characterized in that The acceleration gear set includes a rotating shaft and a coaxially arranged large acceleration gear and a small acceleration gear, the diameter of the large acceleration gear is larger than the diameter of the small acceleration gear, the rotating shaft is fixedly connected to the housing, and the large acceleration gear and the small acceleration gear are sleeved on the rotating shaft; The active rack is meshed with the acceleration pinion, the cutter rack is meshed with the acceleration gear, and the acceleration gear rotates synchronously with the acceleration pinion.

6. The extrusion device according to claim 1, characterized in that: The gear rack assembly comprises an active rack, a same-speed gear set and a cutter rack, the active rack is connected to the housing, the gear set is respectively meshed with the active rack and the cutter rack, and the blade is connected to the cutter rack; After the active rack is subjected to force, it is meshed and transmitted through the same-speed gear set to drive the cutter rack to move, thereby driving the blade to move.

7. The extrusion device according to claim 6, characterized in that The same-speed gear set includes a rotating shaft and two coaxially arranged gears, the two gears have the same diameter, the rotating shaft is fixedly connected to the housing, and the two gears are sleeved on the rotating shaft; The active rack is meshed with any one of the two gears, the cutter rack is meshed with the other gear, and the two gears rotate synchronously.

8. The extrusion device according to any one of claims 2 to 7, characterized in that The cutting mechanism further comprises an elastic member, The elastic member is connected to the active rack and is used to provide a thrust to the active rack away from the consumables, so that the blade returns to an initial position; and / or, The elastic member abuts against the cutter rack to provide a thrust to the cutter rack away from the consumable material, so that the blade returns to an initial position; and / or, The elastic member is arranged on the gear set and is used for providing a rotation force to the gear set so that the blade returns to an initial position.

9. The extrusion device according to claim 8, characterized in that A limiting structure is arranged at one end of the active rack close to the consumable material, one end of the elastic member abuts against the limiting structure, and the other end abuts against the shell.

10. The extrusion device according to claim 9, characterized in that The active rack further includes a limiting groove, the elastic member is at least partially located in the limiting groove, and the limiting groove is used to limit the deformation direction of the elastic member.

11. The extrusion device according to claim 8, characterized in that: The housing is provided with a first through hole, and the active rack can pass through the first through hole; An end cap is provided at one end of the active rack away from the consumable, and the end cap can be clamped with the edge of the first through hole; The elastic member is wound around the active rack, and one end of the elastic member abuts against the end cover, and the other end abuts against the shell.

12. The extrusion device according to claim 10, characterized in that A limiting column is provided on at least one side of the housing and the active rack. The other of the housing and the active rack is provided with a slideway cooperating with the limiting column. The limiting column abuts against the slideway and slides in the slideway, so that the active rack slides relative to the housing.

13. The extrusion device according to claim 8, characterized in that The extrusion device comprises a position detection device for detecting the moving position of the blade.

14. The extrusion device according to claim 13, characterized in that The cutter rack comprises a clearance groove, and the position detection device is installed in the clearance groove. When the blade moves to the position of cutting the consumable material, the position detection device is triggered.

15. The extrusion device according to claim 13, characterized in that The position detection device is arranged on a side of the housing corresponding to the active rack, and when the blade moves to a position for cutting off the consumable material, the active rack triggers the position detection device.

16. The extrusion device according to claim 3, characterized in that The reduction gear set is provided as one or more, and the plurality of reduction gear sets are arranged parallel to each other between the driving rack and the cutter rack; and The large reduction gear of each reduction gear set meshes with the small reduction gear of another reduction gear set, and the small reduction gear of each reduction gear set meshes with the large reduction gear of another reduction gear set.

17. The extrusion device according to claim 5, characterized in that The acceleration gear set is provided as one or more, and the plurality of acceleration gear sets are arranged parallel to each other between the driving rack and the cutter rack; and The acceleration large gear of each acceleration gear set is meshed with the acceleration small gear of another acceleration gear set, and the acceleration small gear of each acceleration gear set is meshed with the acceleration large gear of another acceleration gear set.

18. The extrusion device according to claim 7, characterized in that The same-speed gear set is provided in one or more groups, and the multiple same-speed gear sets are arranged in parallel with each other between the driving rack and the cutter rack; and A gear in each of the same-speed gear sets meshes with a gear in the next of the same-speed gear sets.

19. The extrusion device according to claim 1, characterized in that The housing comprises a front housing and a rear housing, wherein the front housing is fixedly connected to the rear housing; the front housing has a mounting hole; and / or, The extrusion device further comprises a cover plate, and the cover plate is used for covering the mounting hole.

20. The extrusion device according to claim 19, characterized in that The cover plate is configured as a transparent plate with transparency.

21. The extrusion device according to claim 1, characterized in that The movement direction of the blade is perpendicular to the travel direction of the consumable; The blade portion of the blade is a flat blade or an oblique blade.

22. A 3D printing device, characterized in that: An extrusion device comprising the extrusion device according to any one of claims 1 to 21.

23. The 3D printing device according to claim 22, characterized in that: The 3D printing device further comprises a housing, wherein a second through hole is provided on the housing. The active rack can pass through the second through hole to connect with the outside.

24. The 3D printing device according to claim 23, characterized in that: An end cap is provided at one end of the active rack, and the end cap can be engaged with the second through hole; or, The end cover can be locked with the edge of the second through hole.

25. The 3D printing device according to claim 24, characterized in that: Also includes: A stopper is arranged on the movement path of the extrusion device. When the extrusion device moves along the movement path, the stopper presses the gear rack assembly to drive the blade to move toward the direction close to the consumables.

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