Feeding monitoring assembly, spray head unit applying feeding monitoring assembly and 3D printing equipment

Abstract

The embodiment of the utility model provides a feeding monitoring assembly, a spray head unit applying the feeding monitoring assembly and 3D printing equipment. The feeding monitoring assembly is used for monitoring consumables and comprises a connecting support, a swing arm, a circuit board and a reset piece. A through hole is formed in the connecting support and used for conveying consumables. The swing arm comprises a first end part and a second end part which are arranged at an interval, the first end part is rotationally connected with the connecting bracket, and the second end part is used for abutting against the consumable; the circuit board comprises a first induction piece, the first induction piece and the second end part are arranged at an interval, and the first induction piece is used for sensing the position change state of the second end part relative to the first induction piece; the reset piece is connected with the swing arm and used for pushing the second end to extrude towards the side where the through hole is located. The nozzle unit comprises an extrusion assembly and the feeding monitoring assembly which are connected, the nozzle unit is provided with a conveying channel used for conveying consumables, the conveying channel penetrates through the extrusion assembly and the feeding monitoring assembly, and the through hole coincides with the conveying channel.

Description

Technical Field

[0001] The present application relates to the field of 3D printing, and particularly to a feeding monitoring component, a nozzle unit using the same, and a 3D printing device. Background Art

[0002] 3D printing technology is a rapid prototyping technology that uses a digital model file as a basis and applies special wax materials, powdered metals, plastics, or other bondable materials to manufacture three-dimensional objects by printing layer upon layer of materials. Fused deposition modeling technology is one of the main 3D printing technologies. In this technology, a hot-melt filament (consumable) is heated and melted and then extruded from a nozzle, deposited on a forming platform or the previously cured material of the previous layer, and finally a physical object is generated.

[0003] During the printing process, the consumption of the consumable is usually continuous. However, if there is a jam or lack of material, the 3D printing process will pause, which may lead to printing failure, damage to the 3D printing device, and even cause a fire. Therefore, it is very important to monitor the consumable. How to solve the above problems and provide a structure capable of monitoring the feeding of the consumable is what those skilled in the art need to consider. Summary of the Utility Model

[0004] To solve the problems in the prior art, embodiments of the present application provide a feeding monitoring component, a nozzle unit using the same, and a 3D printing device.

[0005] Embodiments of the present application provide a feeding monitoring component for monitoring a consumable, which includes a connecting bracket, a swing arm, a circuit board, and a reset member. The connecting bracket is provided with a through hole for transmitting the consumable; the swing arm includes a first end portion and a second end portion arranged at intervals, the first end portion is rotatably connected to the connecting bracket, and the second end portion is used to abut against the consumable; the circuit board includes a first sensing member spaced from the second end portion for sensing the position change state of the second end portion relative to the first sensing member; the reset member is connected to the swing arm and is used to push the second end portion to squeeze towards the side where the through hole is located.

[0006] In one embodiment, the first sensing member is a contact sensor, and the first sensing member is separably in contact with the second end portion.

[0007] In one embodiment, the first sensing member is a non-contact sensor, the first sensing member is spaced from the second end portion, the second end portion is movably arranged relative to the first sensing member, and the first sensing member is used to sense and generate an electrical signal when the second end portion is in a stationary state or an electrical signal when the second end portion is in a moving state.

[0008] In one embodiment, the first sensing element is a magnetic induction sensor, the second end portion is made of a magnetic material, or a second sensing element made of a magnetic material is provided at the second end portion.

[0009] In one embodiment, the first sensing element is an inductive sensor, the second end portion is made of a conductor material, or a second sensing element made of a conductor material is provided at the second end portion.

[0010] In one embodiment, the first sensing element is an ultrasonic sensor, which includes an ultrasonic transmitting end and an ultrasonic receiving end. The ultrasonic transmitting end is used to emit ultrasonic waves, the second end portion is used to reflect ultrasonic waves, and the ultrasonic receiving end is used to receive ultrasonic waves.

[0011] In one embodiment, the feeding monitoring assembly further includes a second sensing element, and the second sensing element is connected to the second end portion.

[0012] In one embodiment, the first sensing element and the second sensing element cooperate to form a photoelectric sensor. The first sensing element and the second sensing element are optically connected, and the first sensing element and the second sensing element are used to cooperate to sense the change in the distance between them.

[0013] In one embodiment, the first sensing element and the second sensing element cooperate to form a capacitive sensor. An electrostatic field is formed between the first sensing element and the second sensing element, and the first sensing element and the second sensing element are used to cooperate to sense the change in the distance between them.

[0014] In one embodiment, the second end portion includes a first surface and a second surface facing away from each other. The first surface is the surface of the second end portion facing the side where the through hole is located, and the first surface is used to abut against the consumable. The second surface is configured to be provided with a second sensing element, and the second sensing element is used to cooperate with the first sensing element to sense the position change of the second end portion.

[0015] In one embodiment, the first surface has an arc-shaped curved surface or inclined surface, and the second surface is provided with a mounting groove for mounting the second sensing element.

[0016] In one embodiment, the first sensing element is provided on the side of the circuit board facing the side where the through hole is located. The first sensing element and the second sensing element are arranged at intervals, and the second sensing element is driven by the second end portion to approach or move away from the first sensing element.

[0017] In one embodiment, the first end is disposed closer to the circuit board than the second end. The reset member is connected to the first end and is configured to push the swing arm from the side of the swing arm away from the through hole, so that the swing arm presses the consumable material toward the side where the through hole is located.

[0018] In one embodiment, the through hole penetrates the connection bracket along a first direction, the circuit board is spaced from the through hole along a second direction, and the first direction intersects the second direction.

[0019] In one embodiment, the connection bracket is further provided with an avoidance groove and an assembly cavity. The avoidance groove communicates with the through hole along the first direction, the assembly cavity communicates with the avoidance groove, the circuit board and the through hole are located on opposite sides of the assembly cavity along the second direction, the first end is located in the assembly cavity, and the second end has a tendency to extend into the avoidance groove under the drive of the reset member.

[0020] In one embodiment, the first end is provided with a first mounting hole penetrating along a third direction. The third direction intersects the first direction and the second direction. The reset member and the first end are arranged side by side along the third direction. The reset member has a second mounting hole penetrating along the third direction, and the connection bracket has a third mounting hole penetrating along the third direction. The first mounting hole, the second mounting hole, and the third mounting hole are correspondingly arranged along the third direction, and a rotating shaft penetrates the first mounting hole, the second mounting hole, and the third mounting hole.

[0021] In one embodiment, the reset member is a torsion spring. The reset member includes a force storage body, a first arm, and a second arm. The first arm and the second arm are respectively connected to the force storage body. The first arm abuts against the connection bracket and / or the circuit board, and the second arm abuts against the side of the swing arm away from the through hole. The second arm is used to push the swing arm toward the through hole.

[0022] The embodiment of the present application further provides a nozzle unit, which includes an extrusion assembly and the feeding monitoring assembly according to any one of the foregoing embodiments. The feeding monitoring assembly is connected to the extrusion assembly. The nozzle unit is provided with a transmission channel for transmitting the consumable material. The transmission channel penetrates through the extrusion assembly and the feeding monitoring assembly, and the through hole coincides with the transmission channel.

[0023] The embodiment of the present application further provides a 3D printing device, which includes a forming platform and a driving assembly, and the feeding monitoring assembly according to any one of the foregoing embodiments or the foregoing nozzle unit. The driving assembly drives the feeding monitoring assembly to move relative to the forming platform.

[0024] Furthermore, for the feed monitoring component of the present application, the through hole provided in the connecting bracket is used to transmit the consumable, and the relative positional relationship between the consumable and the connecting bracket can be determined; the first end is rotatably connected to the connecting bracket, and the reset member pushes the second end to squeeze toward the side where the through hole is located. The swing arm can be pushed by the reset member to always have a tendency to press against the consumable provided in the through hole with the first end as the axis. When there is a consumable in the through hole, the second end can abut against the consumable.

[0025] It can be understood that the surface of the consumable must not have a completely flat outer surface. As the consumable is fed normally, the second end and the consumable maintain relative movement. The second end abutting against the surface of the consumable will swing to a certain extent following the shape change of the outer surface of the consumable. The circuit board provided with the first sensing member is connected to the connecting bracket, and the distance between the second end and the first sensing member changes with the swing. The first sensing member is used to sense the position change state of the second end relative to the first sensing member. The distance of the second end from the first sensing member sensed by the first sensing member is changing, thereby causing the first sensing member to generate an electrical signal indicating that the position of the second end is continuously changing; once there is a situation such as the consumable running out of material, being blocked, or lacking material, the feeding of the consumable will stop, the second end and the consumable will remain relatively stationary and will no longer swing, the distance between the second end and the first sensing member will no longer change, and the first sensing member will generate an electrical signal indicating that the position of the second end has not changed continuously; by obtaining the electrical signal of the first sensing member, the monitoring of the feeding state of the consumable can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A perspective view of the feed monitoring component provided by the first embodiment of the present application from one angle.

[0027] Figure 2 A perspective view of the feed monitoring component provided by the first embodiment of the present application from another angle.

[0028] Figure 3 is Figure 1 A cross-sectional view along the III-III direction.

[0029] Figure 4 A partial perspective view of the feed monitoring component provided by the first embodiment of the present application.

[0030] Figure 5 A partial perspective view of the feed monitoring component provided by the first embodiment of the present application.

[0031] Figure 6 A partial perspective view of the feed monitoring component provided by the first embodiment of the present application.

[0032] Figure 7Schematic structural diagram of the feeding monitoring component provided by the second embodiment of the present application.

[0033] Figure 8 Schematic structural diagram of the feeding monitoring component provided by the third embodiment of the present application.

[0034] Figure 9 Schematic structural diagram of the feeding monitoring component provided by the fourth embodiment of the present application.

[0035] Figure 10 Schematic structural diagram of the feeding monitoring component provided by the fifth embodiment of the present application.

[0036] Figure 11 Schematic structural diagram of the feeding monitoring component provided by the sixth embodiment of the present application.

[0037] Figure 12 Stereoscopic diagram of the nozzle unit provided by the embodiment of the present application.

[0038] Figure 13 For Figure 12 Partial cross-sectional schematic view along the XIII-XIII direction.

[0039] Figure 14 Stereoscopic diagram of the first bracket of the nozzle unit provided by the embodiment of the present application.

[0040] Figure 15 Stereoscopic diagram of the 3D printing device provided by the embodiment of the present application.

[0041] Description of main component symbols

[0042] Feeding monitoring component 10

[0043] Transport channel 100

[0044] Connecting bracket 11

[0045] Through hole 111

[0046] Avoidance groove 112

[0047] Assembly cavity 113

[0048] Third mounting hole 114

[0049] Positioning post 115

[0050] First assembly hole 116

[0051] Chute 117

[0052] Swing arm 12

[0053] First end 121

[0054] First mounting hole 1211

[0055] Second end portion 122

[0056] First surface 1221

[0057] Second surface 1222

[0058] Mounting groove 12221

[0059] Second sensing member 13

[0060] Circuit board 14

[0061] Board body 140

[0062] First sensing member 141

[0063] Ultrasonic emission end 1411

[0064] Ultrasonic receiving end 1412

[0065] Second assembly hole 142

[0066] Positioning hole 143

[0067] Interaction sensor 144

[0068] Reset member 15

[0069] Energy storage main body 150

[0070] First arm 151

[0071] Second arm 152

[0072] Second mounting hole 153

[0073] Positioning pin 16

[0074] First direction Z

[0075] Second direction X

[0076] Third direction Y

[0077] Spray head unit 1

[0078] Extrusion assembly 18

[0079] First bracket 181

[0080] First main body portion 1811

[0081] Sliding protrusion 1812

[0082] Coordination portion 1813

[0083] Avoidance cavity 1814

[0084] Extrusion wheel 182

[0085] Nozzle assembly 19

[0086] 3D printing device 2

[0087] Forming platform 21

[0088] Drive assembly 22

[0089] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific embodiments

[0090] The following description will refer to the drawings to more fully describe the content of the present application. The exemplary embodiments shown in the drawings are of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that the present application will be thorough and complete and will fully convey the scope of the present application to those skilled in the art. Similar reference numerals denote the same or similar components. The terms used herein are for the purpose of describing particular exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. In addition, when used herein, "comprising" and / or "including" and / or "having", integers, steps, operations, components and / or components, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In addition, unless clearly defined in the text, terms such as those defined in a general dictionary should be construed as having a meaning consistent with their meaning in the relevant art and the content of the present application and will not be construed as idealized or overly formal.

[0091] Generally, during the printing process, the consumption of the consumable is usually continuous. However, if there is a material jamming or material shortage, the 3D printing process will be paused, which may lead to printing failure, or even damage to the 3D printing device, and even cause a fire. Therefore, it is very important to monitor the consumable. How to solve the above problems and provide a structure capable of monitoring the feeding of the consumable is what those skilled in the art need to consider.

[0092] Correspondingly, an embodiment of the present application provides a feeding monitoring component for monitoring consumables, which includes a connecting bracket, a swing arm, a circuit board, and a reset member. The connecting bracket is provided with a through hole for transmitting the consumables; the swing arm includes a first end portion and a second end portion arranged at intervals, the first end portion is rotatably connected to the connecting bracket, and the second end portion is used to abut against the consumables; the circuit board includes a first sensing member spaced from the second end portion for sensing the position change state of the second end portion relative to the first sensing member; the reset member is connected to the swing arm and is used to push the second end portion to squeeze toward the side where the through hole is located.

[0093] Furthermore, in the feeding monitoring component of the present application, the through hole provided in the connecting bracket is used to transmit the consumables, and the relative position relationship between the consumables and the connecting bracket can be determined; the first end portion is rotatably connected to the connecting bracket, and the reset member pushes the second end portion to squeeze toward the side where the through hole is located. The swing arm can be pushed by the reset member to make the second end portion always have a tendency to tightly abut against the consumables provided in the through hole with the first end portion as the axis. When there are consumables in the through hole, the second end portion can abut against the consumables.

[0094] It can be understood that the surface of the consumables is necessarily not completely flat. As the consumables are fed normally, the second end portion and the consumables maintain relative movement. The second end portion abutting against the surface of the consumables will swing to a certain extent following the shape change of the outer surface of the consumables. The circuit board provided with the first sensing member is connected to the connecting bracket, and the distance between the second end portion and the first sensing member changes with the swing. The first sensing member is used to sense the position change state of the second end portion relative to the first sensing member. The distance between the second end portion sensed by the first sensing member and it is changing, thereby causing the first sensing member to generate an electrical signal indicating that the position of the second end portion is continuously changing; once situations such as consumable material breakage, blockage, or shortage occur, the feeding of the consumables will stop, the second end portion and the consumables will remain relatively stationary and will no longer swing, the distance between the second end portion and the first sensing member will no longer change, and the first sensing member will generate an electrical signal indicating that the position of the second end portion has not changed continuously; by obtaining the electrical signal of the first sensing member, the monitoring of the feeding state of the consumables can be realized.

[0095] Those skilled in the art can understand that "3D printing" refers to a technology that constructs objects by layer-by-layer printing based on digital model files using powdered metals, plastics, or other bondable materials.

[0096] The following content will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; identical or similar components will be given the same or similar reference numerals or similar technical terms.

[0097] The following further describes in detail the specific embodiments of the present application with reference to the accompanying drawings.

[0098] First Embodiment

[0099] As Figures 1 to 6 shown, an embodiment of the present application provides a feeding monitoring assembly 10 for monitoring consumables. The feeding monitoring assembly 10 includes a connecting bracket 11, a swing arm 12, a circuit board 14, and a reset member 15. The connecting bracket 11 is connected to the circuit board 14. The swing arm 12 is located between the connecting bracket 11 and the circuit board 14. The swing arm 12 is movably connected to the connecting bracket 11. The reset member 15 is connected to the swing arm 12 and is located between the connecting bracket 11 and the circuit board 14.

[0100] In one embodiment, the connecting bracket 11 is provided with a through hole 111 for transmitting consumables. The swing arm 12 includes a first end portion 121 and a second end portion 122 arranged at intervals. The first end portion 121 is rotatably connected to the connecting bracket 11. The second end portion 122 is used to abut against the consumables. The circuit board 14 is connected to the connecting bracket 11. The circuit board 14 includes a first sensing member 141. The first sensing member 141 is arranged at an interval from the second end portion 122 and is used to sense the position change state of the second end portion 122 relative to the first sensing member 141. The reset member 15 is connected to the swing arm 12 and is used to push the second end portion 122 to squeeze toward the side where the through hole 111 is located.

[0101] It can be understood that for the feeding monitoring assembly 10 of the present application, the through hole 111 provided in the connecting bracket 11 is used to transmit consumables, and the relative position relationship between the consumables and the connecting bracket 11 can be determined. The first end portion 121 is rotatably connected to the connecting bracket 11, and the reset member 15 pushes the second end portion 122 to squeeze toward the side where the through hole 111 is located. The swing arm 12 can be pushed by the reset member 15 to make the second end portion 122 always have a tendency to tightly abut against the consumables provided in the through hole 111 with the first end portion 121 as the axis. When there are consumables in the through hole 111, the second end portion 122 can abut against the consumables.

[0102] Furthermore, the surface of the consumable necessarily does not have a completely flat outer surface. As the consumable is fed normally, the second end portion 122 moves relative to the consumable. The second end portion 122 abutting against the surface of the consumable will swing to a certain extent following the shape change of the outer surface of the consumable. The circuit board 14 provided with the first sensing member 141 is connected to the connecting bracket 11. The distance between the second end portion 122 and the first sensing member 141 changes with the swing. The first sensing member 141 is used to sense the position change state of the second end portion 122 relative to the first sensing member 141. The distance of the second end portion 122 sensed by the first sensing member 141 from it also changes, thereby causing the first sensing member 141 to generate an electrical signal indicating that the position of the second end portion 122 is continuously changing; once situations such as consumable material breakage, blockage, or shortage occur, the feeding of the consumable will stop, the second end portion 122 will remain relatively stationary with the consumable and will no longer swing, the distance between the second end portion 122 and the first sensing member 141 will no longer change, thereby causing the first sensing member 141 to generate an electrical signal indicating that the position of the second end portion 122 is not continuously changing; by obtaining the electrical signal of the first sensing member 141, the monitoring of the feeding state of the consumable can be realized.

[0103] It can be understood that there are various ways for the first sensing member 141 to sense the position change state of the second end portion 122. According to different contact methods, the first sensing member 141 can be roughly divided into two types: a contact sensor and a non-contact sensor. Among them, for the solution where the first sensing member 141 is a non-contact sensor, the first sensing member 141 and the second end portion 122 are arranged at an interval, and the second end portion 122 is movably arranged relative to the first sensing member 141. The first sensing member 141 is used to sense and generate an electrical signal indicating that the second end portion 122 is in a stationary state or an electrical signal indicating that the second end portion 122 is in a moving state.

[0104] In this embodiment, taking the first sensing member 141 as a non-contact sensor as an example for display, the first sensing member 141 is a magnetic induction sensor, and the second end portion 122 is provided with a second sensing member 13 made of a magnetic material.

[0105] In one embodiment, the through hole 111 penetrates through the connecting bracket 11 along a first direction Z. The circuit board 14 is arranged at an interval from the through hole 111 along a second direction X, and the first direction Z intersects with the second direction X. The connecting bracket 11 is further provided with an avoidance groove 112 and an assembly cavity 113. The avoidance groove 112 communicates with the through hole 111 along the first direction Z, the assembly cavity 113 communicates with the avoidance groove 112, the circuit board 14 and the through hole 111 are located on opposite sides of the assembly cavity 113 along the second direction X, the first end portion 121 is located in the assembly cavity 113, and the second end portion 122 is driven by a reset member 15 to have a tendency to extend into the avoidance groove 112.

[0106] In one embodiment, a third mounting hole 114 penetrating through the connecting bracket 11 in the third direction Y, where the third direction Y intersects with the first direction Z and the second direction X. The two third mounting holes 114 are respectively located on opposite sides of the assembly cavity 113 along the third direction Y, and the two third mounting holes 114 communicate with the assembly cavity 113.

[0107] In one embodiment, two positioning posts 115 and two first assembly holes 116 are further provided on the surface of the connecting bracket 11 facing the circuit board 14. The two positioning posts 115 are respectively located on opposite sides of the assembly cavity 113 along the third direction Y, and the two first assembly holes 116 are respectively located on opposite sides of the assembly cavity 113 along the third direction Y. The two positioning posts 115 protrude outward from the main body of the connecting bracket 11, and the two first assembly holes 116 are formed by penetrating or recessing the main body of the connecting bracket 11.

[0108] In this embodiment, the avoidance groove 112 and the assembly cavity 113 are formed by penetrating or recessing the main body of the connecting bracket 11. The connecting bracket 11 has an inclined wall surface corresponding to the avoidance groove 112 near the through hole side, for corresponding to the swing arm 12. The widths of the connecting bracket 11 corresponding to the opposite sides of the avoidance groove 112 along the third direction Y are substantially corresponding to the width of the swing arm 12 along the third direction Y, for guiding the swing arm 12. The assembly cavity 113 communicates with the avoidance groove 112, and the connecting bracket 11 has an opening structure corresponding to the assembly cavity 113 near the circuit board 14 side, for exposing the inside of the connecting bracket 11 to facilitate the installation of the swing arm 12 and the circuit board 14.

[0109] In one embodiment, a sliding groove 117 extending along the first direction Z may also be formed on the outer surface of the connecting bracket 11, for connecting the connecting bracket 11 with the first bracket 181 of the nozzle unit 1.

[0110] In one embodiment, the first end portion 121 is arranged closer to the circuit board 14 than the second end portion 122, and the reset member 15 is connected to the first end portion 121. The reset member 15 is configured to push the swing arm 12 from the side of the swing arm 12 away from the through hole 111, so that the swing arm 12 squeezes the consumable towards the side where the through hole 111 is located.

[0111] In this embodiment, the swing arms 12 are arranged substantially in a straight line. The first end portion 121 and the second end portion 122 are respectively located at both ends of the swing arm 12. The swing arm 12 has a certain rigidity and can be pushed by the reset member 15 to rotate in a substantially predetermined direction. The first end portion 121 is arranged closer to the circuit board 14, so that there is a certain movement gap between the second end portion 122 and the transmission channel 100, and thus the second end portion 122 can swing.

[0112] In one embodiment, the second end portion 122 includes opposite first surface 1221 and second surface 1222. The first surface 1221 is the surface of the second end portion 122 facing away from the circuit board 14, and the first surface 1221 is used to abut against the consumable. The second surface 1222 is the surface of the second end portion 122 facing the circuit board 14, and the second sensing member 13 is disposed on the second surface 1222 and connected to the second end portion 122.

[0113] In one embodiment, the first surface 1221 has an arc-shaped curved surface or inclined surface, and an installation groove 12221 is formed on the second surface 1222. The second sensing member 13 is disposed in the installation groove 12221 and connected to the second end portion 122.

[0114] It can be understood that the first surface 1221 has an arc-shaped curved surface; on the one hand, by contacting through the arc-shaped surface, the situation of damaging the consumable when the second end portion 122 abuts against the consumable can be reduced; on the other hand, using the top end of the arc-shaped first surface 1221 to abut against the consumable can reduce the contact area between the second end portion 122 and the consumable, and improve the sensitivity of the second end portion 122 to sense the movement of the consumable. The installation groove 12221 can be formed by recessing from the second surface 1222 towards the first surface 1221 side. The second sensing member 13 is disposed in the installation groove 12221, which can increase the installation strength of the second sensing member 13 and the swing arm 12, and make the structure more compact.

[0115] In one embodiment, a first installation hole 1211 is formed through the first end portion 121 along a third direction Y. The reset member 15 is arranged side by side with the first end portion 121 along the third direction Y. The reset member 15 is a torsion spring, and the reset member 15 has a second installation hole 153 formed through it along the third direction Y. The first installation hole 1211, the second installation hole 153, and the third installation hole 114 are correspondingly arranged along the third direction Y. A rotating shaft (not shown in the figure) passes through the first installation hole 1211, the second installation hole 153, and the third installation hole 114.

[0116] It can be understood that the rotating shaft can be a fixing structure such as a plug. By passing the rotating shaft through the first installation hole 1211, the second installation hole 153, and the third installation hole 114, the first end portion 121 and the reset member 15 can be connected to the connection bracket 11 together.

[0117] In one embodiment, the reset member 15 is a torsion spring. The reset member 15 includes a force storage body 150, a first arm 151, and a second arm 152. The first arm 151 and the second arm 152 are respectively connected to the force storage body 150. The first arm 151 abuts against the connection bracket 11 and / or the circuit board 14, and the second arm 152 abuts against the side of the swing arm 12 away from the through hole 111. The second arm 152 is used to push the swing arm 12 towards the through hole 111.

[0118] In one embodiment, the first arm 151 and the second arm 152 may be metal rod-shaped structures extending from both sides of the energy storage body 150. The first arm 151 and the second arm 152 are respectively connected to the energy storage body 150 to achieve the transmission of force. The first arm 151 is configured to abut against the connection bracket 11 and / or the circuit board 14 to provide support for the energy storage body 150. The second arm 152 extends to abut against the side of the swing arm 12 away from the through hole, so that the energy storage body 150 is in a compressed energy storage state. Then, the energy storage body 150 has a tendency to push the swing arm 12 through the second arm 152.

[0119] It can be understood that the force that the reset member 15 can provide is set within a suitable range. The force that the reset member 15 can provide is not easily too small, and it is necessary to make the swing arm 12 able to abut against the surface of the consumable. At the same time, the force that the reset member 15 can provide should not be too large, so as not to cause damage to the shape of the consumable and / or not to make the swing amplitude of the swing arm 12 too small.

[0120] In one embodiment, the first sensing member 141 is disposed on the side of the circuit board 14 facing the through hole 111. The first sensing member 141 and the second sensing member 13 are spaced apart. The second sensing member 13 is driven by the second end portion 122 to approach or move away from the first sensing member 141.

[0121] In one embodiment, the circuit board 14 includes a board body 140, a first sensing member 141, and an interaction sensor 144. Circuits may be provided on the board body 140. The first sensing member 141 and the interaction sensor 144 are respectively connected to the board body 140 and can perform electrical signal interaction. Two positioning holes 143 and two second assembly holes 142 are formed in the board body 140. The two positioning holes 143 and the two positioning holes 143 respectively penetrate the board body 140 along the second direction X. The board body 140 is connected to the connection bracket 11. The two positioning holes 143 are respectively used to accommodate two positioning posts 115. The two second assembly holes 142 respectively correspond to the positions of the two first assembly holes 116. A positioning pin 16 passes through a first assembly hole 116 and a second assembly hole 142, and another positioning pin 16 passes through the other first assembly hole 116 and the other second assembly hole 142 to fix the circuit board 14 and the connection bracket 11.

[0122] In this embodiment, the first sensing element 141 is disposed on the side of the plate body 140 facing the connecting bracket 11 and is accommodated in the assembly cavity 113. The first sensing element 141 is an electronic component capable of sensing changes in the magnetic field and generating corresponding electrical signals. The second sensing element 13 can be a permanent magnet or an electromagnet. The first sensing element 141 can sense the magnetic field that changes due to the change in the distance from the second sensing element 13 and generate corresponding electrical signals. Specifically, the second sensing element 13 is a bar-shaped permanent magnet. One magnetic pole of the second sensing element 13 is configured to face the second end portion 122, and the other magnetic pole of the second sensing element 13 is configured to face the first sensing element 141. The first sensing element 141 can sense the magnetic field generated by the second sensing element 13. As the distance between the second sensing element 13 and the first sensing element 141 changes, the intensity of the magnetic field emitted by the second sensing element 13 sensed by the first sensing element 141 changes accordingly, causing the first sensing element 141 to generate an electrical signal indicating that the second end portion 122 is in a moving state. For example, when the distance between the second sensing element 13 and the first sensing element 141 increases, the magnetic field intensity (or magnetic flux density) sensed by the first sensing element 141 decreases; when the distance between the second sensing element 13 and the first sensing element 141 decreases, the magnetic field intensity (or magnetic flux density) sensed by the first sensing element 141 increases. Similarly, when the consumable stops feeding, the position of the second end portion 122 will no longer change, the distance between the first sensing element 141 and the second end portion 122 will no longer change, and the first sensing element 141 will no longer sense the change in the magnetic field, causing the first sensing element 141 to generate an electrical signal indicating that the second end portion 122 is in a stationary state.

[0123] It can be understood that the first sensing element 141 is a device capable of detecting, measuring, and monitoring magnetic fields, and they work based on the interaction between the magnetic field and magnetic materials. When a magnetic field acts on a magnetic material, the magnetic properties of the magnetic material change, thereby causing a change in the electrical signal of the sensing element. This change in the electrical signal can be amplified, filtered, etc. through a signal processing circuit, and finally corresponding data or signals are output. The first sensing element 141 can include Hall effect sensors, magnetoresistive sensors, magnetoelectric sensors, fluxgate sensors, anisotropic magnetoresistive (AMR) sensors, inductive magnetometers, etc. Among them, the Hall effect sensor utilizes the Hall effect. When a current passes through the Hall element, the magnetic field acts on the Hall element, causing a potential difference to be generated on both sides of the Hall element, and this potential difference is proportional to the magnetic field intensity; the magnetoresistive sensor utilizes the magnetoresistive effect and detects the magnetic field by measuring the resistance change caused by the magnetic field.

[0124] It can be understood that the second end portion 122 can also be made of magnetic material. Correspondingly, the second sensing element 13 may not be provided on the second end portion 122.

[0125] In this embodiment, the interaction sensor 144 can be an electrical structure integrated with other functional units such as a power interface and a central processing unit, so that the circuit board 14 can perform electrical signal interaction with the nozzle unit 1 and / or process the electrical signals generated by the first sensing member 141.

[0126] Second Embodiment

[0127] Further in combination with Figure 7 As shown, it is a structural schematic diagram of the second embodiment of the present application. The difference between the second embodiment and the first embodiment is that: the first sensing member 141 is an inductive sensor, and the second end portion 122 is provided with a second sensing member 13 made of a conductive material.

[0128] It can be understood that an inductive sensor is a device that uses the principle of electromagnetic induction to convert measured non-electrical quantities such as displacement, pressure, flow rate, vibration, etc. into changes in the self-inductance L or mutual inductance M of a coil. The working principle of an inductive sensor is based on Faraday's law of electromagnetic induction, that is, when a conductor moves in a magnetic field to cut the magnetic induction lines, an induced electromotive force will be generated in the conductor. Self-induction refers to the electromagnetic induction phenomenon generated in the conductor itself when the current in the conductor changes. When a high-frequency sinusoidal alternating current passes through the coil, an alternating magnetic field is generated in the surrounding space of the coil. This magnetic field will affect the adjacent ferromagnetic material, causing eddy currents to be generated inside the ferromagnetic material, thereby changing the inductance value of the coil. By measuring the change in the inductance value, the magnitude or state of the external physical quantity can be determined.

[0129] The inductive magnetic sensor has a simple structure, no moving electrical contacts, a long working life, high sensitivity, high resolution, can measure mechanical displacement changes as small as 0.01 micrometers or even smaller, can sense tiny angular changes as small as 0.1', the output signal of the sensor is strong, and the voltage sensitivity can generally reach several hundred millivolts per millimeter. Among them, the first sensing member 141 can further include a self-inductive sensor, a differential transformer type sensor, and an eddy current sensor. The self-inductive sensor is made using the principle that the self-inductance changes with the air gap and is used to measure displacement. The differential transformer type sensor is a sensor that converts the change in the measured non-electrical quantity into a change in the mutual inductance of the coil. Since this sensor is made based on the basic principle of a transformer and the secondary windings are connected in a differential form, it is called a differential transformer type sensor. The eddy current sensor, on the other hand, uses the change in the magnetic field around the coil to detect the presence or absence of a metal object.

[0130] In this embodiment, when the consumable is feeding normally, the position of the second end portion 122 will change continuously. The second end portion 122 swings continuously relative to the first sensing member 141 and cuts the magnetic induction lines. The first sensing member 141 can sense the change in the mechanical displacement of the second end portion 122, causing the first sensing member 141 to generate an electrical signal indicating that the second end portion 122 is in a moving state. Similarly, when the feeding of the consumable stops, the position of the second end portion 122 will no longer change. The second end portion 122 no longer swings relative to the first sensing member 141 and no longer cuts the magnetic induction lines. The first sensing member 141 will no longer sense the change in the mechanical displacement of the second end portion 122, causing the first sensing member 141 to generate an electrical signal indicating that the second end portion 122 is in a stationary state.

[0131] It can be understood that the second end portion 122 can also be made of a conductor material. Correspondingly, the second sensing member 13 may not be provided on the second end portion 122.

[0132] Third Embodiment

[0133] Further in combination with Figure 8 As shown, it is a structural schematic diagram of the third embodiment of the present application. The difference between the third embodiment and the first embodiment is that the first sensing member 141 is an ultrasonic sensor, which includes an ultrasonic transmitting end 1411 and an ultrasonic receiving end 1412. The ultrasonic transmitting end 1411 is used to emit ultrasonic waves, the second end portion 122 is used to reflect ultrasonic waves, and the ultrasonic receiving end 1412 is used to receive ultrasonic waves; the second sensing member 13 may not be provided on the second end portion 122.

[0134] It can be understood that an ultrasonic sensor is a device that uses ultrasonic waves for ranging and detection. It mainly consists of two parts: a transmitter (ultrasonic transmitting end 1411) and a receiver (ultrasonic receiving end 1412). The transmitter part is excited by a voltage signal to generate a high-frequency electrical signal, and the electrical energy is converted into sound energy through a piezoelectric crystal. The receiver part receives the ultrasonic wave signal and converts it into a corresponding electrical signal. When the ultrasonic wave reaches the surface of the target object, a part of the sound wave will be reflected back, called the reflected wave. The receiver module in the sensor will receive this reflected wave and convert it into an electrical signal. The piezoelectric crystal in the receiver will also be vibrated by the sound wave to generate an electrical signal. The receiver will transmit the received electrical signal to the signal processing circuit for processing. The signal processing circuit first calculates the propagation time of the ultrasonic wave. By knowing the speed of sound and the propagation time, the signal processing circuit can obtain the distance between the target object and the sensor.

[0135] In this embodiment, when the consumable is feeding normally, the position of the second end portion 122 will change continuously. The second end portion 122 swings continuously relative to the first sensing member 141. The first sensing member 141 can sense that the distance from the second end portion 122 to the first sensing member 141 is changing continuously, causing the first sensing member 141 to generate an electrical signal indicating that the second end portion 122 is in a moving state. Similarly, when the feeding of the consumable stops, the position of the second end portion 122 will no longer change, the second end portion 122 will no longer swing relative to the first sensing member 141, and the first sensing member 141 can sense that the distance from the second end portion 122 to the first sensing member 141 no longer changes, causing the first sensing member 141 to generate an electrical signal indicating that the second end portion 122 is in a stationary state.

[0136] Fourth Embodiment

[0137] Further combined with Figure 9 As shown, it is a structural schematic diagram of the fourth embodiment of the present application. The difference between the fourth embodiment and the first embodiment is that: the first sensing member 141 and the second sensing member 13 cooperate to form a photoelectric sensor. The first sensing member 141 and the second sensing member 13 are optically connected. The first sensing member 141 and the second sensing member 13 are used to cooperate to sense the change in the distance between them; at least one of the first sensing member 141 and the second sensing member 13 can emit light, and at least one of the first sensing member 141 and the second sensing member 13 can receive light and generate an electrical signal.

[0138] It can be understood that a photoelectric sensor is a device that converts a light signal into an electrical signal, and its working principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon that when light irradiates on certain substances, the electrons of the substances absorb the energy of photons and generate corresponding electrical effects. The photoelectric sensor can perform position measurement based on the principle of light inverse difference interruption or distance measurement based on the principle of light layer number measurement.

[0139] In this embodiment, when the consumable is feeding normally, the position of the second end portion 122 will change continuously. The second end portion 122 swings continuously relative to the first sensing member 141. The time or intensity of the light propagation between the first sensing member 141 and the second sensing member 13 sensed by them changes, causing the first sensing member 141 to generate an electrical signal indicating that the second end portion 122 is in a moving state. Similarly, when the feeding of the consumable stops, the position of the second end portion 122 will no longer change, the second end portion 122 will no longer swing relative to the first sensing member 141, causing the first sensing member 141 to generate an electrical signal indicating that the second end portion 122 is in a stationary state.

[0140] Fifth Embodiment

[0141] Further combined with Figure 10As shown, it is a structural schematic diagram of the fifth embodiment of the present application. The difference between the fifth embodiment and the first embodiment is that: the first sensing element 141 and the second sensing element 13 cooperate to form a capacitive sensor. An electrostatic field is formed between the first sensing element 141 and the second sensing element 13. The first sensing element 141 and the second sensing element 13 are used to cooperate to sense the change in the distance between the two.

[0142] It can be understood that a capacitive sensor is a sensor that works based on the principle of a capacitor. It converts the measured physical quantity into a change in capacitance. A capacitive sensor usually consists of two metal electrodes and an insulating medium; when the measured physical quantity changes, such as the distance between the electrodes, the area of the electrodes, or the dielectric constant of the medium changes, the capacitance value of the capacitor will also change accordingly. This change can be converted into an electrical signal output through a measurement circuit, thereby realizing the detection of the measured physical quantity.

[0143] In this embodiment, the first sensing element 141 and the second sensing element 13 are respectively two metal electrodes. The air between the first sensing element 141 and the second sensing element 13 arranged at intervals can be approximately equivalent to an insulating medium (by controlling the distance and voltage between the first sensing element 141 and the second sensing element 13 to prevent the air from being broken down), and the first sensing element 141 and the second sensing element 13 can form a capacitor. When the consumable is feeding normally, the position of the second end portion 122 will change continuously. The second end portion 122 swings continuously relative to the first sensing element 141. The continuous change in the distance between the first sensing element 141 and the second sensing element 13 causes the capacitance to change continuously, causing the first sensing element 141 to generate an electrical signal indicating that the second end portion 122 is in a moving state. Similarly, when the feeding of the consumable stops, the position of the second end portion 122 will no longer change. The second end portion 122 no longer swings relative to the first sensing element 141. The distance between the first sensing element 141 and the second sensing element 13 no longer changes, resulting in the capacitance no longer changing, causing the first sensing element 141 to generate an electrical signal indicating that the second end portion 122 is in a stationary state.

[0144] Sixth Embodiment

[0145] Further combined with Figure 11 As shown, it is a structural schematic diagram of the fifth embodiment of the present application. The difference between the fifth embodiment and the first embodiment is that: the first sensing element 141 is a contact sensor, and the first sensing element 141 is separably in contact with the second end portion 122; the second sensing element 13 may not be provided on the second end portion 122.

[0146] It can be understood that the first sensing member 141 can be a contact sensor such as a microswitch. A microswitch is a switch with a small contact gap and a quick-acting mechanism, and its contact mechanism performs switch actions through a specified stroke and force. The working principle of a microswitch is mainly based on its internal spring mechanism and contact structure. When an external mechanical force acts on the operating reed through a transmission element (such as a button, lever, roller, etc.), when the operating reed displaces to the critical point, an instantaneous action will occur, causing the moving contact at the end of the operating reed to quickly connect or disconnect from the fixed contact. When the force on the transmission element is removed, the operating reed generates a reverse acting force. When the reverse stroke of the transmission element reaches the action critical point of the reed, the reverse action is instantaneously completed. The microswitch has a small contact spacing, a short action stroke, a small actuation force, and quick on / off. The action speed of its moving contact is independent of the action speed of the transmission element.

[0147] In this embodiment, the second end portion 122 is configured to be able to contact or separate from the first sensing member 141 multiple times within a period of time as the consumable is fed, so as to achieve multiple triggers of the first sensing member 141. When the consumable is fed normally, the position of the second end portion 122 will continuously change, the second end portion 122 will continuously swing relative to the first sensing member 141, and the second end portion 122 will continuously trigger the first sensing member 141, causing the first sensing member 141 to generate an electrical signal indicating that the second end portion 122 is in a moving state. Similarly, when the feeding of the consumable stops, the position of the second end portion 122 will no longer change, the second end portion 122 will no longer swing relative to the first sensing member 141, and the contact state between the second end portion 122 and the first sensing member 141 will become continuous contact or continuous separation, causing the first sensing member 141 to generate an electrical signal indicating that the second end portion 122 is in a stationary state.

[0148] Further in combination with Figures 12 to 14 As shown, the embodiment of the present application further provides a nozzle unit 1, which includes an extrusion assembly 18 and the aforementioned feeding monitoring assembly 10. The feeding monitoring assembly 10 is connected to the extrusion assembly 18. The nozzle unit 1 is provided with a transmission channel 100 for transmitting the consumable. The transmission channel 100 penetrates through the extrusion assembly 18 and the feeding monitoring assembly 10, and the through hole 111 coincides with the transmission channel 100.

[0149] In one embodiment, the extrusion assembly 18 further includes a first bracket 181. The first bracket 181 has a first main body portion 1811, a sliding protrusion 1812, and a coordination portion 1813. The first main body portion 1811 is generally plate-shaped. The sliding protrusion 1812 is provided on the surface of the first main body portion 1811. The sliding groove 117 is matched with the sliding protrusion 1812, and the connecting bracket 11 is detachably connected to the first main body portion 1811. The coordination portion 1813 and the sliding protrusion 1812 are provided on the same side of the first main body portion 1811. An avoidance cavity 1814 is formed in the coordination portion 1813. The coordination portion 1813 corresponds to the position of the connecting bracket 11. The avoidance cavity 1814 corresponds to the avoidance groove 112 and the assembly cavity 113, and is used for avoiding the second end portion 122 of the swing arm 12.

[0150] In one embodiment, the extrusion assembly 18 further includes a pair of extrusion wheels 182. The pair of extrusion wheels 182 are respectively arranged on both sides of the transmission channel 100. The feeding monitoring assembly 10 is located upstream of the extrusion wheels 182 in the consumable feeding direction (the third direction Y). The nozzle unit 1 further includes a nozzle assembly 19. The nozzle assembly 19 is connected to the extrusion assembly 18. The feeding monitoring assembly 10 is arranged on the side of the extrusion assembly 18 away from the nozzle assembly 19. The transmission channel 100 penetrates through the extrusion assembly 18 and the nozzle assembly 19.

[0151] Further in combination with Figure 15 As shown, the embodiment of the present application further provides a 3D printing device 2, which includes a forming platform 21 and a driving assembly 22, and the feeding monitoring assembly 10 as described in any one of the foregoing embodiments or the nozzle unit 1 as described above. The driving assembly 22 drives the feeding monitoring assembly 10 to move relative to the forming platform 21.

[0152] In the foregoing, the specific embodiments of the present application have been described with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that various changes and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. These changes and substitutions all fall within the scope defined by the present application.

Claims

1. A feed monitoring component, which is used to monitor consumables, characterized in that: include: A connecting bracket, which is provided with a through hole, and the through hole is used for transmitting consumables; A swing arm, comprising a first end and a second end that are spaced apart, wherein the first end is rotatably connected to the connecting bracket, and the second end is used to abut against the consumable; A circuit board, comprising a first sensing element, the first sensing element being spaced apart from the second end portion and configured to sense a position change state of the second end portion compared to the first sensing element; A reset member is connected to the swing arm and is used to push the second end portion to be squeezed toward the side where the through hole is located.

2. The feed monitoring assembly according to claim 1, characterized in that: The first sensing element is a contact sensor, and the first sensing element is in detachable contact with the second end portion.

3. The feed monitoring assembly according to claim 1, characterized in that: The first sensing element is a non-contact sensor, the first sensing element is spaced apart from the second end, the second end is movably arranged compared to the first sensing element, and the first sensing element is used to sense and generate an electrical signal indicating that the second end is in a stationary state or an electrical signal indicating that the second end is in a moving state.

4. The feed monitoring assembly according to claim 3, characterized in that: The first induction element is a magnetic induction sensor, the second end is a magnetic material, or the second end is provided with a second induction element made of a magnetic material.

5. The feed monitoring assembly according to claim 3, characterized in that: The first inductive element is an inductive sensor, the second end is a conductive material, or the second end is provided with a second inductive element made of a conductive material.

6. The feed monitoring assembly according to claim 3, characterized in that: The first sensing element is an ultrasonic sensor, which includes an ultrasonic transmitting end and an ultrasonic receiving end. The ultrasonic transmitting end is used to emit ultrasonic waves, the second end is used to reflect ultrasonic waves, and the ultrasonic receiving end is used to receive ultrasonic waves.

7. The feed monitoring assembly according to claim 3, characterized in that: The feed monitoring assembly further includes a second sensing element connected to the second end portion.

8. The feed monitoring assembly according to claim 7, characterized in that: The first sensing element and the second sensing element cooperate to form a photoelectric sensor. The first sensing element is connected to the second sensing element through an optical path. The first sensing element and the second sensing element cooperate to sense a distance change between the first sensing element and the second sensing element.

9. The feed monitoring assembly according to claim 7, characterized in that: The first induction element and the second induction element cooperate to form a capacitive sensor. An electrostatic field is formed between the first induction element and the second induction element. The first induction element and the second induction element cooperate to sense a change in the distance between the first induction element and the second induction element.

10. The feed monitoring assembly according to claim 1, characterized in that: The second end portion includes a first surface and a second surface opposite to each other, the first surface being the surface of the second end portion facing the side where the through hole is located, the first surface being used to abut against the consumable material, and the second surface being constructed to be provided with a second sensing element, and the second sensing element being used to cooperate with the first sensing element to sense the position change of the second end portion.

11. The feed monitoring assembly according to claim 10, characterized in that: The first surface has an arc-shaped curved surface or an inclined surface, and the second surface is provided with a mounting groove, and the mounting groove is used for mounting the second sensing element.

12. The feed monitoring assembly according to claim 2, characterized in that: The first induction member is disposed on a side of the circuit board facing the through hole. The first induction member is spaced apart from a second induction member. The second induction member is driven by the second end to move closer to or farther from the first induction member.

13. The feed monitoring assembly according to claim 1, characterized in that: The first end is arranged closer to the circuit board than the second end, and the reset member is connected to the first end. The reset member is constructed to push the swing arm from the side of the swing arm away from the through hole, so that the swing arm squeezes the consumable toward the side where the through hole is located.

14. The feed monitoring assembly according to claim 13, characterized in that: The through hole is arranged to penetrate the connecting bracket along a first direction, and the circuit board is arranged to be spaced apart from the through hole along a second direction, and the first direction intersects with the second direction.

15. The feed monitoring assembly according to claim 14, characterized in that: The connecting bracket is also provided with an avoidance groove and an assembly cavity, the avoidance groove is connected with the through hole along the first direction, the assembly cavity is connected with the avoidance groove, the circuit board and the through hole are located on opposite sides of the assembly cavity along the second direction, the first end is located in the assembly cavity, and the second end is driven by the reset member to have a tendency to extend into the avoidance groove.

16. The feed monitoring assembly according to claim 15, characterized in that: A first mounting hole is formed through the first end portion along a third direction, and the third direction intersects with the first direction and the second direction. The reset member and the first end portion are arranged side by side along the third direction. The reset member has a second mounting hole formed through the third direction. The connecting bracket has a third mounting hole formed through the third direction. The first mounting hole, the second mounting hole and the third mounting hole are correspondingly arranged along the third direction. A rotating shaft passes through the first mounting hole, the second mounting hole and the third mounting hole.

17. The feed monitoring assembly according to claim 14, characterized in that: The reset member is a torsion spring, and the reset member includes a force storage body, a first arm and a second arm, the first arm and the second arm are respectively connected to the force storage body, the first arm is supported by the connecting bracket and / or the circuit board, the second arm is supported by the side of the swing arm away from the through hole, and the second arm is used to push the swing arm to move toward the through hole.

18. A nozzle unit, characterized in that: It includes an extrusion component and a feed monitoring component as described in any one of claims 1 to 17, wherein the feed monitoring component is connected to the extrusion component, the nozzle unit is provided with a transmission channel, the transmission channel is used to transmit consumables, the transmission channel passes through the extrusion component and the feed monitoring component, and the through hole coincides with the transmission channel.

19. A 3D printing device, characterized in that: It comprises a molding platform and a driving assembly, such as a feed monitoring assembly as described in any one of claims 1 to 17 or a nozzle unit as described in claim 18, wherein the driving assembly drives the feed monitoring assembly to move relative to the molding platform.

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