Guide structure and 3D printer

Abstract

The utility model discloses a guiding structure and a 3D printer, and relates to the technical field of 3D printing, the guiding structure is used for connecting a transmission pipeline and an extrusion device, the guiding structure comprises a shell, a detection assembly and a guiding piece, and the shell is provided with a containing cavity; the detection assembly is arranged in the containing cavity, and the detection assembly is provided with an empty strike detection piece; the guide part is movably connected to the shell, a part of the guide part is contained in the containing cavity, the guide part is provided with a feeding port and a discharging port, the feeding port is used for feeding a wire material, the discharging port is used for discharging the wire material, the guide part comprises a first triggering part, and the first triggering part is used for triggering the empty strike detection part. According to the technical scheme provided by the utility model, whether empty printing occurs in the printing device is timely detected.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printing technical field, especially a guide structure and 3D printer. BACKGROUND

[0002] 3D printer, also called three-dimensional printer, is a kind of process equipment of rapid prototyping, usually is to print material to realize by digital technology.3D printer is often used in mold manufacturing, industrial design etc. field to manufacture model or spare part.

[0003] When 3D printer is printing, line material is in the form of filament to print module to supply consumables, consumables are heated to melt state in print module, and print module sprays consumables in the form of one layer after one layer according to the moving path generated by the controller of 3D printer to print three-dimensional object. Among them, print module includes extrusion device and nozzle, and extrusion device is used to power line material to feed or discharge material to nozzle.

[0004] However, when line material appears to be blocked in the pipeline or guide piece of extrusion device, line material cannot move or moves slowly, and extrusion device will continue to drive line material, resulting in the problems of feeding failure or empty printing of print module. UTILITY MODEL CONTENT

[0005] The main purpose of the utility model is to provide a guide structure and 3D printer, which aims to detect whether the printing device appears empty printing in time.

[0006] In order to achieve the above purpose, the utility model provides a guide structure for connecting transmission pipeline and extrusion device, the guide structure comprises:

[0007] Shell, the shell is equipped with cavity;

[0008] Detection assembly, the detection assembly is equipped in the cavity, and the detection assembly is equipped with empty printing detection piece;And

[0009] Guide piece, the guide piece is movably connected to the shell, and at least part of the guide piece is accommodated in the cavity, the guide piece is equipped with feeding port and discharge port, the feeding port is used to feed line material, the discharge port is used to discharge line material, and the guide piece includes first trigger part, and the first trigger part is used to trigger the empty printing detection piece.

[0010] In an embodiment, the cavity includes first cavity, second cavity and first communication port communicating the first cavity and the second cavity;

[0011] At least part of the guide is slidingly arranged in the first cavity, the detection assembly is arranged in the second cavity, the first trigger part extends into the second cavity through the first communication opening and is arranged corresponding to the detection assembly.

[0012] In an embodiment, the guide further comprises a guide body and a first elastic member, a limiting platform is arranged in the first cavity, the guide body comprises a first part and a second part connected with each other, the first part is provided with the feeding opening, the second part is provided with the discharging opening, an abutting platform is formed at the connection between the first part and the second part, the first elastic member is sleeved on the second part, and two ends of the first elastic member are elastically abutted against the limiting platform and the abutting platform respectively.

[0013] In an embodiment, the feeding opening comprises a plurality of feeding openings, the first part is provided with a guide cavity in communication with the plurality of feeding openings, a cross-sectional area of the guide cavity gradually decreases from one end close to the feeding opening to one end close to the discharging opening, and / or the guide cavity is arranged in a funnel shape.

[0014] In an embodiment, the first trigger part comprises a first segment and a second segment arranged at an angle, a limiting plate is arranged in the second cavity, the first segment extends into the second cavity through the first communication opening, the second segment extends towards the detection assembly and is movably limited between the outer wall surface of the first cavity and the limiting plate.

[0015] In an embodiment, the first trigger part is provided with a first magnetic member, the detection assembly comprises a circuit board and a first Hall sensor arranged on the circuit board, and the first Hall sensor forms the idle stroke detection member.

[0016] In an embodiment, the guide structure further comprises a mileage detection wheel, the mileage detection wheel is rotatably arranged in the accommodating cavity, a transmission channel for moving the wire rod is arranged in the accommodating cavity, at least part of the mileage detection wheel extends into the transmission channel, the detection assembly is further provided with a mileage detection member, the mileage detection wheel is provided with a second trigger part, and the second trigger part is used for triggering the mileage detection member.

[0017] In an embodiment, the guide structure further comprises a bracket and a second elastic member, the bracket is rotatably connected to the shell, the mileage detection wheel is rotatably connected to one side of the bracket, and the bracket is connected to the shell through the second elastic member.

[0018] In an embodiment, the second trigger part is provided with a second magnetic member, the detection assembly further comprises a second Hall sensor, and the second Hall sensor forms the mileage detection member.

[0019] And / or, the guide structure further comprises an auxiliary wheel, the auxiliary wheel is rotatably connected to the shell, and is arranged opposite to the mileage detection wheel, and the transmission channel is arranged between the auxiliary wheel and the mileage detection wheel.

[0020] The utility model discloses a 3D printer, the 3D printer includes:

[0021] The guide structure as described above; and

[0022] Extrusion device, the guide structure is fixedly arranged on extrusion device.

[0023] The utility model discloses a technical scheme of guide structure includes shell, detection component and guide piece, and detection component sets up in the cavity of shell, to make the shell form protection to detection component, avoid the electronic device of detection component and be damaged or be corroded. The feed inlet of guide piece can be connected with the transmission pipeline of transmission wire material, and the wire material enters the guide piece from the feed inlet, and is transmitted from the discharge port of guide piece to extrusion device, and the extrusion device can provide power for the transmission of wire material. Guide piece is movably connected to shell, and can move opposite to shell, when wire material is in normal transmission, the friction between wire material and transmission pipeline or guide piece is in normal range, and the first trigger part of guide piece is in the position of the idle striking detection piece away from detection component, and when wire material is blocked in transmission pipeline or guide piece, the friction between wire material and transmission pipeline or guide piece will increase to abnormal range, and the extrusion device cannot normally pull wire material, and the transmission of wire material will become slow or even stagnate, resulting in the problem of idle striking of extrusion device, and the extrusion device still continuously drives wire material, and wire material will drive transmission pipeline to extrude guide piece and move guide piece or directly move guide piece, and guide piece will move relative to detection component, and the first trigger part is close to idle striking detection piece to trigger idle striking detection piece. When the idle striking detection piece of detection component is triggered, can send the abnormal alarm to the user, and the user is prompted to check the exception in time, to avoid the feeding failure of extrusion device or the problem of idle striking exception. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creating labor.

[0025] Figure 1 The utility model provides a guide structure's structural schematic diagram in an embodiment of the utility model;

[0026] Figure 2 The utility model provides a guide structure's exploded view schematic diagram in an embodiment of the utility model;

[0027] Figure 3 A cross-sectional view of the guide structure in one embodiment of this utility model.

[0028] Explanation of icon numbers:

[0029] 100. Guide structure; 1. Shell; 11. Cavity; 111. First cavity; 1111. Limiting platform; 1112. Outer wall; 112. Second cavity; 1121. Limiting plate; 113. First connecting port; 114. Second connecting port; 12. Inlet; 13. Outlet; 14. Transmission channel; 2. Detection component; 21. Circuit board; 22. Dry run detection component; 23. Mileage detection component; 3. Guide component; 31. Guide body; 311, First part; 3111, Feed inlet; 3112, Feed chamber; 3113, Guide chamber; 312, Second part; 3121, Discharge chamber; 3122, Discharge outlet; 313, Abutment platform; 32, First elastic element; 33, First triggering part; 331, First section; 332, Second section; 4, Mileage detection wheel; 41, Second triggering part; 5, Bracket; 6, Second elastic element; 7, Auxiliary wheel.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] Please refer to the reference. Figures 1 to 3 As shown, this utility model proposes a guide structure 100, which includes a housing 1, a detection component 2, and a guide member 3. The housing 1 is provided with a cavity 11; the detection component 2 is provided in the cavity 11 and is provided with a dry-fire detection component 22; the guide member 3 is movably connected to the housing 1, and at least part of the guide member 3 is housed in the cavity 11. The guide member 3 is provided with an inlet 3111 and an outlet 3122. The inlet 3111 is used for feeding wire material, and the outlet 3122 is used for discharging wire material. The guide member 3 includes a first trigger part 33, which is used to trigger the dry-fire detection component 22.

[0035] In this embodiment, the housing 1 serves as the mounting and supporting structure for the detection component 2 and the guide 3. The detection component 2 is disposed within the cavity 11 of the housing 1, so that the housing 1 protects the detection component 2 and prevents damage or corrosion to the electronic components within the detection component 2. The housing 1 also serves as the fixing structure for the guide structure 100, and can be detachably fixed to the extrusion device or integrally formed with the housing of the extrusion device. The feed port 3111 of the guide 3 can be connected to the transmission pipe for the wire material. The wire material enters the guide 3 from the feed port 3111 and exits from the discharge port 3122 of the guide 3, being transported to the extrusion device. The extrusion device can provide power for the transmission of the wire material. The guide member 3 is movably connected to the housing 1 and can move relative to the housing 1. When the wire is being transported normally, the friction between the wire and the transport pipe or guide member 3 is within the normal range. The first trigger part 33 of the guide member 3 is located away from the dry-run detection member 22 of the detection component 2. However, when the wire is blocked in the transport pipe or guide member 3, the friction between the wire and the transport pipe or guide member 3 increases to an abnormal range. The extrusion device cannot pull the wire normally, and the wire transport becomes slow or even stops, causing the extrusion device to experience dry-running. The extrusion device continues to drive the wire, which will cause the transport pipe to squeeze the guide member 3, causing the guide member 3 to move or directly causing the guide member 3 to move. The guide member 3 will move relative to the detection component 2, and the first trigger part 33 will approach the dry-run detection member 22 to trigger the dry-run detection member 22. When the dry-run detection member 22 of the detection component 2 is triggered, an abnormal alarm can be sent to the user, prompting the user to troubleshoot the abnormality in time to avoid feeding failure or dry-running abnormality of the extrusion device.

[0036] Understandably, the direction in which the guide member 3 can move relative to the housing 1 can be set to the direction in which the wire is transported from the feed port 3111 of the guide member 3 to the discharge port 3122 of the guide member 3, so that the guide member 3 can be moved along the transport direction after the wire becomes blocked. The guide member 3 can be movably connected to the housing 1 by sliding or rotating, and the dry-run detection element 22 of the detection component 2 is set on the sliding stroke or rotation stroke of the first trigger part 33.

[0037] The first triggering part 33 is used to trigger the air-fire detection element 22. When the first triggering part 33 approaches or contacts the air-fire detection element 22, the air-fire detection element 22 is in a triggered state; when the first triggering part 33 moves away from the air-fire detection element 22, the air-fire detection element 22 is in a non-triggered state.

[0038] Specifically, the empty-fire detection element 22 can be configured as a non-contact sensor, such as a photoelectric sensor or an electromagnetic sensor, to detect the firing position. When the first triggering part 33 enters the detection range of the empty-fire detection element 22 and is detected by the empty-fire detection element 22, the empty-fire detection element 22 is triggered by the first triggering part 33. Correspondingly, when the first triggering part 33 leaves the detection range of the empty-fire detection element 22, the empty-fire detection element 22 is in an untriggered state. Alternatively, the empty-fire detection element 22 can be configured as a contact sensor, such as a piezoelectric sensor or a mechanical limit sensor, to detect the firing position. When the first triggering part 33 contacts or presses against the trigger end of the empty-fire detection element 22, the empty-fire detection element 22 is triggered by the first triggering part 33. Correspondingly, when the first triggering part 33 leaves the trigger end of the empty-fire detection element 22, the empty-fire detection element 22 is in an untriggered state. Optionally, the first triggering part 33 can be a structural component on the guide member 3.

[0039] In actual implementation, the detection component 2 can be connected to the extrusion device via signal or electrical connection. When the dry run detection element 22 of the detection component 2 is triggered, the extrusion device receives the dry run signal and promptly suspends operation so that the user can troubleshoot the fault and avoid greater damage.

[0040] Optionally, the guide member 3 can be disposed outside the cavity 11, with only the first trigger part 33 extending into the cavity 11, to facilitate triggering the dry-fire detection member 22 of the detection assembly 2. Alternatively, the cavity 11 may have an inlet 12 and an outlet 13, with the guide member 3 completely disposed within the cavity 11. The wire material is transferred from the inlet 12 to the feed port 3111 of the guide member 3 and from the discharge port 3122 of the guide member 3 to the outlet 13. Or, the guide member 3 may be partially disposed within the cavity 11, such as by passing through the inlet 12 or the outlet 13 of the cavity 11, or by passing through both the inlet 12 and the outlet 13 of the cavity 11. The inlet 12 or the outlet 13 of the cavity 11 may provide guidance when the guide member 3 moves relative to the housing 1, without specific limitations.

[0041] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the cavity 11 includes a first cavity 111, a second cavity 112, and a first connecting port 113 connecting the first cavity 111 and the second cavity 112; at least a portion of the guide member 3 is slidably disposed in the first cavity 111, the detection component 2 is disposed in the second cavity 112, and the first trigger part 33 extends into the second cavity 112 through the first connecting port 113 and is correspondingly disposed with the detection component 2.

[0042] In this embodiment, the cavity 11 is at least divided into a first cavity 111 and a second cavity 112. At least a portion of the guide member 3 is slidably disposed in the first cavity 111. Correspondingly, the first cavity 111 provides a track for the movement of the guide member 3 relative to the housing 1, so that the guide member 3 moves in a preset direction when moving relative to the housing 1. At the same time, the arrangement of the first cavity 111 also prevents the guide member 3 from deviating during the transmission of wire, improving the transmission effect of the wire. The detection component 2 is disposed in the second cavity 112. In this way, the detection component 2 and the guide member 3 are relatively separated, so as to facilitate the modular installation of the guide member 3 and the detection component 2. At the same time, it reduces the possibility of the guide member 3 accidentally colliding with the electronic components of the detection component 2 when moving relative to the housing 1, thereby improving the reliability of the guide member 3 and the detection component 2 during operation.

[0043] Understandably, the first cavity 111 and the second cavity 112 are connected through the first connecting port 113, so that the first trigger part 33 of the guide 3 extends into the second cavity 112, thereby triggering the dry-fire detection component 22 of the detection assembly 2. The first connecting port 113 can be located at the end of the first cavity 111 or in the middle of the first cavity 111, and no specific limitation is made here.

[0044] In one embodiment of this utility model, such as Figures 1 to 3 As shown, the guide member 3 also includes a guide body 31 and a first elastic member 32. The first cavity 111 is provided with a limiting platform 1111. The guide body 31 includes a first part 311 and a second part 312 connected to each other. The first part 311 is provided with a feed inlet 3111, and the second part 312 is provided with a discharge outlet 3122. The connection between the first part 311 and the second part 312 forms an abutment platform 313. The first elastic member 32 is sleeved on the second part 312, and the two ends of the first elastic member 32 elastically abut against the limiting platform 1111 and the abutment platform 313 respectively.

[0045] In this embodiment, the guide body 31 is elastically connected to the housing 1 via a first elastic element 32. The first elastic element 32 provides resistance to the relative movement of the guide body 31 and the housing 1. Thus, when the wire is being transported normally, the position of the guide body 31 is relatively fixed relative to the position of the housing 1, improving the stability of the guide body 31 during wire transport. When the wire is blocked, the friction between the wire and the transport pipe or the guide body 31 increases. Consequently, driven by the extrusion device, the wire can overcome the resistance of the first elastic element 32, indirectly or directly driving the guide body 31 to slide along the first cavity 111. Depending on the position of the first elastic element 32, it may compress or stretch when the guide body 31 is driven by the wire; no specific limitation is made here.

[0046] In actual implementation, the first elastic element 32 can be a spring, which is sleeved on the first part 311 of the guide body 31. The inner wall of the first cavity 111 forms a limiting platform 1111, and correspondingly, the guide body 31 is provided with an abutment platform 313. The first elastic element 32 is also limited between the limiting platform 1111 and the abutment platform 313, thus realizing the fixation of the position of the first elastic element 32 and the elastic connection between the guide body 31 and the housing 1.

[0047] Understandably, the guide body 31 includes a first part 311 and a second part 312. The outer contour cross-sectional area of ​​the first part 311 is larger than that of the second part 312, thus forming an abutment platform 313 at the connection between the first part 311 and the second part 312. Simultaneously, this also facilitates the drawing of the inner cavity cross-section formed by the first part 311 to be larger than that formed by the second part 312, thereby aiding in guiding the wire from the feed inlet 3111 of the first part 311 to the discharge outlet 3122 of the second part 312.

[0048] Optionally, the first part 311 and the second part 312 are coaxially arranged, and the axial direction of the first part 311 and the second part 312 is parallel to the moving direction of the guide body 31. Then, the first elastic member 32 sleeved on the second part 312 can provide uniform elastic force to the guide body 31 when it deforms, thereby improving the stability of the guide body 31 when it moves relative to the housing 1.

[0049] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the feed inlet 3111 includes multiple inlets, and the first part 311 is provided with a guide cavity 3113 communicating with the multiple feed inlets 3111. The cross-sectional area of ​​the guide cavity 3113 gradually decreases from one end near the feed inlet 3111 to the end near the discharge outlet 3122, and / or the guide cavity 3113 is arranged in a funnel shape.

[0050] In this embodiment, the guide body 31 is provided with multiple feed ports 3111, so the guide structure 100 can be applied to the transmission of multi-color yarns, and each feed port 3111 can transmit one type of yarn. Optionally, the feed ports 3111 can be set to two, three, or four, etc. When there are four feed ports 3111, the four feed ports 3111 are arranged in parallel or in a matrix. It is understood that each yarn can be fed and discharged independently, but each yarn needs to be transmitted to the extrusion device through the discharge port 3122 of the guide body 31. There are multiple feed ports 3111, while there is only one discharge port 3122. In order to facilitate the smooth transmission of yarns entering the guide body 31 from different feed ports 3111 through the discharge port 3122, the first part 311 is provided with a guide cavity 3113 to guide the movement of the yarns within the guide body 31. The cross-sectional area of ​​the guide cavity 3113 gradually decreases from the end near the feed inlet 3111 to the end near the discharge outlet 3122. The cavity wall of the guide cavity 3113 can provide guidance for the wire, so that the wire can move smoothly towards the discharge outlet 3122.

[0051] Optionally, the guide cavity 3113 is arranged in a funnel shape, and the cavity wall of the guide cavity 3113 has a smooth transition, so as to reduce the frictional resistance between the wire and the cavity wall of the guide cavity 3113 and improve the smoothness of the wire movement.

[0052] In actual implementation, multiple feed ports 3111 are arranged in parallel at the end of the first part 311 away from the second part 312, and the discharge port 3122 is arranged at the end of the second part 312 away from the first part 311. The guide cavity 3113 is formed in the part of the first part 311 close to the second part 312. The first part 311 also forms a feed cavity 3112 between the feed ports 3111 and the guide cavity 3113. The cross-sectional area of ​​the feed cavity 3112 is constant and not less than the cross-sectional area of ​​the guide cavity 3113, thereby providing sufficient space for the wire material extending from the multiple feed ports 3111, avoiding excessive resistance when the wire material enters the guide body 31 from the feed ports 3111, and reducing the difficulty of the wire material entering the guide body 31. The second part 312 has a discharge cavity 3121 with a cross-sectional area equivalent to that of the feed ports 3111. The feed cavity 3112, the guide cavity 3113, and the discharge cavity 3121 are connected in sequence.

[0053] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the first trigger part 33 includes a first segment 331 and a second segment 332 arranged at an angle. A limiting plate 1121 is provided in the second cavity 112. The first segment 331 passes through the first connecting port 113 and extends into the second cavity 112. The second segment 332 extends toward the detection component 2 and is movably limited between the outer wall surface 1112 of the first cavity 111 and the limiting plate 1121.

[0054] In this embodiment, the first segment 331 and the second segment 332 are connected at an angle. The second segment 332 is connected to the end of the first segment 331 near the second cavity 112. The first segment 331 passes through the first connecting port 113 and extends into the second cavity 112. The second segment 332 is located inside the second cavity 112 and is used to trigger the dry-fire detection element 22. The second segment 332 extends towards the detection component 2, which facilitates controlling the trigger distance between the second segment 332 and the dry-fire detection element 22 within a reasonable range. This avoids false triggering due to an excessively small trigger distance, and also avoids insufficient sensitivity and timeliness in dry-fire detection due to an excessively large trigger distance. Alternatively, the movement distance of the guide element 3 can be controlled by the limiting cooperation between the first segment 331 and the side wall of the first connecting port 113, which is not specifically limited here.

[0055] When the guide 3 moves along the first cavity 111, the first segment 331 drives the second segment 332 to move between the outer wall surface 1112 of the first cavity 111 and the limiting plate 1121. The outer wall surface 1112 of the first cavity 111 and the limiting plate 1121 guide the second segment 332, thereby improving the stability of the second segment 332 moving towards the air-firing detection component 22.

[0056] In one embodiment of the present invention, the first trigger part 33 is provided with a first magnetic element, and the detection component 2 includes a circuit board 21 and a first Hall sensor provided on the circuit board 21. The first Hall sensor forms a dry-fire detection component 22.

[0057] In this embodiment, the air-time detection element 22 is configured as a first Hall sensor. Correspondingly, the first triggering part 33 is provided with a first magnetic element that can trigger the first Hall sensor. The first magnetic element can be a permanent magnet or an electromagnet, or other magnetic components. The first Hall sensor is based on the Hall effect and can determine whether to trigger by sensing the magnetic field strength. The closer the first magnetic element is to the first Hall sensor, the stronger the magnetic field strength sensed by the first Hall sensor. Therefore, a first trigger value can be preset for the first Hall sensor. When the magnetic field strength detected by the first Hall sensor is not less than the first trigger value, the first Hall sensor is triggered and generates a corresponding electrical signal. When the distance between the first magnetic element and the first Hall sensor is a first preset distance, the magnetic field strength detected by the first Hall sensor is set as the first trigger value. As the first magnetic element gradually approaches the first Hall sensor with the first triggering part 33 until the distance between the first magnetic element and the first Hall sensor reaches the first preset distance, the first Hall sensor is triggered. As a non-contact sensor, the first Hall sensor has the characteristics of no mechanical wear and long life. The first Hall sensor also has high sensitivity and can detect weak magnetic field changes, with extremely high detection accuracy. Meanwhile, the first Hall sensor is insensitive to environmental factors such as dust and vibration, has strong anti-interference ability, and high detection reliability.

[0058] In actual implementation, the first magnetic component can be disposed on the second segment 332 of the first trigger part 33.

[0059] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the guide structure 100 also includes a mileage detection wheel 4, which is rotatably disposed in the cavity 11. The cavity 11 is provided with a transmission channel 14 for the movement of the wire material. At least a portion of the mileage detection wheel 4 extends into the transmission channel 14. The detection assembly 2 is also provided with a mileage detection element 23. The mileage detection wheel 4 is provided with a second trigger part 41, which is used to trigger the mileage detection element 23.

[0060] In this embodiment, the wire material passes through the transmission channel 14 during transmission, causing the mileage detection wheel 4 to rotate. The length of the wire material passing through the mileage detection wheel 4 is equal to the length of the rotation path of the mileage detection wheel 4. The mileage detection wheel 4 is equipped with a second trigger part 41 that can trigger the mileage detection element 23. Each time the mileage detection wheel 4 rotates once, the second trigger part 41 triggers the mileage detection element 23 once. In this way, the detection component 2 can detect the number of rotations of the mileage detection wheel 4 caused by the wire material. The length of the rotation path of the mileage detection wheel 4, i.e., the transmission length of the wire material, can be calculated by the number of rotations of the mileage detection wheel 4 and the circumference of the mileage detection wheel 4 itself. Thus, the guide structure 100 can detect the mileage of the wire material's entry and exit.

[0061] Optionally, the cavity 11 includes a first cavity 111 and a second cavity 112. The detection component 2 and the odometer wheel 4 are disposed in the second cavity 112, and the guide 3 is partially disposed within the first cavity 111. The guide 4 and the first cavity 111 form a wire transport channel 14. In one embodiment, as... Figure 3 As shown, the first cavity 111 is connected to the second cavity 112 through the second connecting port 114. The mileage detection wheel 4, which is rotatably disposed in the second cavity 112, extends at least partially from the second connecting port 114 into the first cavity 111 to detect the mileage of the passing wire.

[0062] In actual implementation, the circumferential surface of the odometer wheel 4 extends into the first cavity 111 from one side and is located on the wire transport path. The circumferential surface of the odometer wheel 4 can press against the wire against the other side wall of the first cavity 111, so that the wire can drive the odometer wheel 4 to rotate. Raised stripes can be provided on the circumferential surface of the odometer wheel 4 to increase the coefficient of friction between the odometer wheel 4 and the wire, preventing slippage between the wire and the odometer wheel 4, which would affect the accuracy of odometer detection during wire transport.

[0063] The second trigger 41 is disposed on the end face of the mileage detection wheel 4, and the mileage detection element 23 is disposed opposite to the end face of the mileage detection wheel 4. Thus, whenever the mileage detection wheel 4 rotates once, the second trigger 41 will pass through the mileage detection element 23 once and trigger the mileage detection element 23 once. By calculating the number of times the mileage detection element 23 is triggered, the number of revolutions of the mileage detection wheel 4 can be determined. The circumference of the mileage detection wheel 4 is a fixed value that can be preset in the detection component 2. Thus, the detection component 2 can calculate the transmission length of the wire.

[0064] Specifically, the second triggering part 41 can be a structural component protruding from the end face of the odometer wheel 4, and the odometer detection element 23 can be a non-contact sensor such as a photoelectric sensor or an electromagnetic sensor. When the second triggering part 41 enters the detection range of the odometer detection element 23 as the odometer wheel 4 rotates, the odometer detection element 23 is triggered by the second triggering part 41. When the second triggering part 41 leaves the detection range of the odometer detection element 23 as the odometer wheel 4 rotates, the odometer detection element 23 is in an untriggered state. Alternatively, the odometer detection element 23 can be a contact sensor such as a piezoelectric sensor or a mechanical limit sensor. When the second triggering part 41 contacts or presses against the odometer detection element 23 as the odometer wheel 4 rotates, the odometer detection element 23 is triggered by the second triggering part 41. When the second triggering part 41 leaves the odometer detection element 23 as the odometer wheel 4 rotates, the odometer detection element 23 is in an untriggered state. Thus, the second triggering part 41 triggers the odometer detection element 23 once for every revolution of the odometer wheel 4.

[0065] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the guide structure 100 also includes a bracket 5 and a second elastic element 6. The bracket 5 is rotatably connected to the housing 1, and the mileage detection wheel 4 is rotatably connected to one side of the bracket 5. The bracket 5 is also connected to the housing 1 through the second elastic element 6.

[0066] In this embodiment, the bracket 5 is rotatably connected to the housing 1, and the mileage detection wheel 4 is disposed on the bracket 5 so that the mileage detection wheel 4 is movable relative to the housing 1, allowing the mileage detection wheel 4 to change the depth of its insertion into the transmission channel 14. One end of the second elastic member 6 is connected to the housing 1, and the other end of the second elastic member 6 is connected to the bracket 5. The second elastic member 6 can provide moving resistance for the bracket 5, thereby providing a certain resistance for the movement of the mileage detection wheel 4. When the wire passes through the mileage detection wheel 4, it will squeeze the mileage detection wheel 4 outward. At this time, the second elastic member 6 deforms, providing corresponding support force for the mileage detection wheel 4, so that the mileage detection wheel 4 can stably press against the wire, avoiding slippage between the mileage detection wheel 4 and the wire, which would affect the accuracy of the mileage detection. At the same time, the mileage detection wheel 4 has a certain clearance stroke for the wire, which can adapt to wires of different diameters.

[0067] Understandably, depending on the different positions of the second elastic element 6, when the mileage detection wheel 4 drives the bracket 5 to deform the second elastic element 6, the second elastic element 6 can be in a compressed or stretched state.

[0068] In actual implementation, the bracket 5 is located inside the second cavity 112 and can be approximately parallel to the first cavity 111. The bracket 5 has a rotating shaft, and the housing 1 has a rotating shaft hole. The rotating shaft is rotatably confined within the rotating hole to achieve a rotatable connection between the bracket 5 and the housing 1. This allows the odometer wheel 4 to move at the second connecting port 114, changing the depth it extends into the first cavity 111. The second elastic element 6 and the odometer wheel 4 are located on the side of the rotating shaft near the outlet 13 of the cavity 11. The second elastic element 6 is also located on the side of the bracket 5 facing away from the odometer wheel 4. When the odometer wheel 4 is squeezed by the wire and moves outward from the second connecting port 114, the second elastic element 6 is in a compressed state. The bracket 5 has a limiting post for the second elastic element 6 to be fitted onto, and the two ends of the second elastic element 6 abut against the housing 1 and the bracket 5, respectively.

[0069] Optionally, the odometer detection element 23 is also mounted on the circuit board 21 of the detection assembly 2. The circuit board 21 can be detachably connected to the bracket 5 so that the relative position of the odometer detection element 23 and the odometer detection wheel 4 remains unchanged, thus avoiding affecting the triggering of the second triggering unit 41 on the odometer detection element 23. It is understood that the actual movable stroke of the odometer detection wheel 4 is very small, and the stroke of the bracket 5 and the circuit board 21 driven by the bracket 5 is also very small. Therefore, the movement of the circuit board 21 will not affect the triggering of the first triggering unit 33 on the dry-fire detection element 22. In actual implementation, the distance between the odometer detection wheel 4 and the rotation axis of the bracket 5 is greater than the distance between the dry-fire detection element 22 and the rotation axis of the bracket 5. Thus, when the bracket 5 rotates, the moving stroke of the dry-fire detection element 22 is smaller than the moving stroke of the odometer detection wheel 4, further reducing the impact on the first triggering unit 33's triggering of the dry-fire detection element 22.

[0070] In one embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the second trigger part 41 is provided with a second magnetic element, and the detection component 2 also includes a second Hall sensor, which forms the mileage detection component 23.

[0071] The mileage detection element 23 is configured as a second Hall sensor. Correspondingly, a second magnetic element that can trigger the Hall sensor is provided on the second triggering part 41. The second magnetic element can be a permanent magnet or an electromagnet, or other magnetic components. The second Hall sensor is based on the Hall effect and can determine whether to trigger by sensing the magnetic field strength. The closer the second magnetic element is to the second Hall sensor, the stronger the magnetic field strength sensed by the second Hall sensor. Therefore, a second trigger value can be preset for the second Hall sensor. When the magnetic field strength detected by the second Hall sensor is not less than the second trigger value, the second Hall sensor is triggered and generates a corresponding electrical signal. When the distance between the second magnetic element and the second Hall sensor is a second preset distance, the magnetic field strength detected by the second Hall sensor is set as the second trigger value. As the second magnetic element gradually approaches the second Hall sensor with the second triggering part 41, until the distance between the second magnetic element and the second Hall sensor reaches the second preset distance, the second Hall sensor is triggered. As a non-contact sensor, the second Hall sensor has the characteristics of no mechanical wear and long life. The second Hall sensor also has high sensitivity, extremely high detection accuracy, and strong anti-interference ability.

[0072] The guide structure 100 also includes an auxiliary wheel 7, which is rotatably connected to the housing 1 and is positioned opposite to the mileage detection wheel 4. A gap is formed between the auxiliary wheel 7 and the mileage detection wheel 4 for the wire material to pass through.

[0073] In this embodiment, the auxiliary wheel 7 and the odometer wheel 4 press against the passing wire. Compared to the odometer wheel 4 pressing against the wall of the first cavity 111, the auxiliary wheel 7 reduces the resistance of the wire passing through, preventing the wire from getting stuck or worn when passing the odometer wheel 4. Optionally, the circumferential surface of the auxiliary wheel 7 can be smooth to further reduce the resistance of the wire transmission.

[0074] This utility model also proposes a 3D printer, which includes a guide structure 100 and an extrusion device. The specific structure of the guide structure 100 is as described in the above embodiments. Since this 3D printer adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The guide structure 100 is fixedly mounted on the extrusion device. Optionally, the extrusion device is electrically connected to the detection component 2. When the dry-run detection element 22 of the detection component 2 is triggered, the extrusion device receives a dry-run signal and automatically pauses operation to avoid damage caused by dry running.

[0075] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A guiding structure, characterized in that, include: The housing has a cavity; A detection component is disposed in the cavity, and the detection component is provided with a dry-firing detection element; and A guide member is movably connected to the housing, and at least a portion of the guide member is housed within the cavity. The guide member has an inlet and an outlet. The inlet is used for feeding wire material, and the outlet is used for discharging wire material. The guide member includes a first triggering part, which is used to trigger the dry-firing detection element.

2. The guide structure as described in claim 1, characterized in that, The cavity includes a first cavity, a second cavity, and a first connecting port connecting the first cavity and the second cavity; At least a portion of the guide member is slidably disposed in the first cavity, the detection component is disposed in the second cavity, the first trigger portion extends into the second cavity through the first communication port, and is disposed correspondingly to the detection component.

3. The guide structure as described in claim 2, characterized in that, The guide also includes a guide body and a first elastic member. The first cavity is provided with a limiting platform. The guide body includes a first part and a second part connected together. The first part is provided with the feed inlet, and the second part is provided with the discharge outlet. The connection between the first part and the second part forms an abutment platform. The first elastic member is sleeved on the second part, and the two ends of the first elastic member elastically abut against the limiting platform and the abutment platform, respectively.

4. The guide structure as described in claim 3, characterized in that, The feed inlets include multiple inlets, and the first part is provided with a guide cavity communicating with the multiple feed inlets. The cross-sectional area of ​​the guide cavity gradually decreases from one end near the feed inlet to one end near the discharge outlet, and / or the guide cavity is funnel-shaped.

5. The guide structure as described in claim 2, characterized in that, The first trigger part includes a first segment and a second segment arranged at an angle. A limiting plate is provided in the second cavity. The first segment passes through the first communication port and extends into the second cavity. The second segment extends toward the detection component and is movably limited between the outer wall surface of the first cavity and the limiting plate.

6. The guide structure as described in any one of claims 1 to 4, characterized in that, The first trigger part is provided with a first magnetic element, and the detection component includes a circuit board and a first Hall sensor disposed on the circuit board, wherein the first Hall sensor forms the air-time detection component.

7. The guide structure as described in any one of claims 1 to 4, characterized in that, The guide structure also includes a mileage detection wheel, which is rotatably disposed in the cavity. The cavity is provided with a transmission channel for the movement of the wire material. At least a portion of the mileage detection wheel extends into the transmission channel. The detection assembly is also provided with a mileage detection element. The mileage detection wheel is provided with a second trigger part, which is used to trigger the mileage detection element.

8. The guide structure as described in claim 7, characterized in that, The guide structure also includes a bracket and a second elastic element. The bracket is rotatably connected to the housing, and the odometer wheel is rotatably connected to one side of the bracket. The bracket is also connected to the housing via the second elastic element.

9. The guide structure as described in claim 7, characterized in that, The second trigger part is provided with a second magnetic element, and the detection component further includes a second Hall sensor, the second Hall sensor forming the mileage detection element; And / or, the guide structure further includes an auxiliary wheel, which is rotatably connected to the housing and is disposed opposite to the mileage detection wheel, and the transmission channel is provided between the auxiliary wheel and the mileage detection wheel.

10. A 3D printer, characterized in that, The 3D printer includes: The guide structure as described in any one of claims 1 to 9; and An extrusion device, wherein the guide structure is fixedly mounted on the extrusion device.

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