Heated print bed junction box and 3D printing apparatus

Abstract

Provided in the present application are a heated print bed junction box and a 3D printing apparatus. The heated print bed junction box is connected to a wiring portion of a heated print bed, and in a movement direction of the heated print bed, the wiring portion is arranged on one side of the heated print bed in a protruding manner. The heated print bed junction box comprises a box body and a wire guide member, wherein the box body encloses the outer side of the wiring portion; the wire guide member is connected to the box body, and is provided with a wire guide channel; one end of a wire of the heated print bed is connected to the wiring portion, and the other end of the wire passes out of the wire guide channel; an extension direction of the wire guide channel and the movement direction of the heated print bed are arranged at a first included angle to each other; and at least part of the inner peripheral wall of the wire guide channel abuts against the wire, and is configured to adjust the arrangement direction of the wire, so as to increase a bending angle, relative to the heated print bed, of the end of the wire that passes out of the wire guide channel.

Description

Hot bed junction box and 3D printing equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on January 23, 2024, with application number 202420171890.1, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of 3D printing technology, and in particular to a hot bed junction box and a 3D printing device. Background Art

[0004] When a 3D printer prints a workpiece, its heated bed moves back and forth to adjust the workpiece's position relative to the nozzle. This bed is typically heated by an external power source connected to a wire. To minimize the space occupied by the wire, it is typically bent before placement. As the heated bed moves back and forth, the wire moves with it, causing repeated bending at the bends, significantly reducing the wire's lifespan. Summary of the Invention

[0005] The present application provides a hot bed junction box and a 3D printing device to solve the problem of low service life of wires in the hot bed junction box in the prior art.

[0006] In a first aspect, the present application provides a hot bed junction box, which is connected to a connection portion of the hot bed, and the connection portion is protruding from one side of the hot bed along the direction of movement of the hot bed; the hot bed junction box includes a box body and a wire member, the box body is wrapped around the outside of the connection portion; the wire member is connected to the box body and has a wire groove, one end of the wire of the hot bed is connected to the connection portion, and the other end thereof passes through the wire groove, the extension direction of the wire groove is arranged at a first angle with the direction of movement of the hot bed, and the inner peripheral wall of the wire groove at least partially abuts the wire, and is used to adjust the layout direction of the wire to increase the bending angle of the end of the wire passing through the wire groove relative to the hot bed.

[0007] In a possible implementation manner, the first angle ranges from 30° to 50°.

[0008] In a possible implementation manner, one end of the wire member is connected to a side of the box body away from the heated bed, and the other end of the wire member is inclined outwardly in a direction away from the heated bed.

[0009] In a possible embodiment, a first inclined surface is provided on a side of the box body away from the hot bed, and the first inclined surface is inclined outward from an end thereof away from the box body toward an end thereof close to the box body, one end of the wire member is connected to the first inclined surface, and an extension direction of the wire groove is perpendicular to the first inclined surface.

[0010] In a possible embodiment, a cavity is opened inside the box body, the wire groove is connected to the cavity, one end of the wire is located in the cavity and electrically connected to the wiring portion, and the other end thereof passes through the wire groove.

[0011] In a possible embodiment, a mounting opening is formed on a side of the box body away from the hot bed;

[0012] The wire guide includes a first section, a second section, and a third section connected in sequence. The outer diameter of the second section is smaller than the outer diameters of the first section and the third section. The second section is clamped in the installation opening.

[0013] In a possible embodiment, the box body includes an upper shell and a lower shell, the upper shell and the lower shell are respectively arranged on opposite sides of the wiring portion and surround the cavity, and the upper shell and the lower shell are both connected to the wiring portion.

[0014] In a possible embodiment, the upper shell is provided with a first connection hole, the wiring portion is provided with a second connection hole, and the lower shell is provided with a third connection hole. The first connection hole, the second connection hole, and the third connection hole are correspondingly arranged and are all for fasteners to pass through; the number of the first connection hole, the second connection hole, and the third connection hole is set to three.

[0015] In a possible embodiment, the connection portion is provided with slots on opposite sides along a first direction, and the first direction is perpendicular to the movement direction of the hot bed;

[0016] An opening is formed at one end of the box body close to the hot bed, the opening communicating with the cavity and allowing the wiring portion to pass through the opening. Two opposite inner walls of the opening along the first direction are provided with snap-fitting protrusions, which are held in the slots.

[0017] In a second aspect, an embodiment of the present application further provides a 3D printing device, comprising a machine platform, a motion mechanism, a hot bed and the above-mentioned hot bed junction box, wherein the motion mechanism is installed on the machine platform, and the motion mechanism is connected to the hot bed in a transmission manner to drive the hot bed to move.

[0018] In a possible implementation, the 3D printing device further includes a power supply, the power supply is located on one side of the heated bed along the first direction, and one end of the wire passing through the wire groove is connected to the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic perspective view of a 3D printing device according to one or more embodiments of the present application.

[0020] FIG2 is a schematic diagram of wiring of a heated bed of the 3D printing device in FIG1 in one or more embodiments.

[0021] FIG3 is a schematic structural diagram of a wiring portion of the 3D printing device in FIG1 in one or more embodiments.

[0022] FIG4 is a perspective schematic diagram of a hot bed junction box in one or more embodiments of the present application.

[0023] FIG5 is a schematic diagram of the separation of the hot bed junction box from the wiring portion in one or more embodiments of the present application.

[0024] FIG6 is a schematic cross-sectional view of the hot bed junction box in FIG5 along the VI-VI direction.

[0025] FIG. 7 is an exploded schematic diagram of the hot bed junction box of the present application in one or more embodiments.

[0026] FIG8 is an exploded schematic diagram of the hot bed junction box of the present application in one or more embodiments from another perspective.

[0027] The meaning of the numbers in the accompanying drawings:

[0028] 3D printing equipment 200

[0029] Machine 210

[0030] Movement mechanism 220

[0031] Hot bed 230

[0032] Connection portion 231

[0033] Card slot 2310

[0034] Second connecting hole 2311

[0035] Perforation 2312

[0036] Electrical contact 232

[0037] Bracket 240

[0038] Nozzle assembly 250

[0039] Wire 260

[0040] Power Supply 270

[0041] Hot bed junction box 100

[0042] Box body 10

[0043] First District 101

[0044] Second section 102

[0045] Cavity 103

[0046] Opening 104

[0047] Snap-on protrusion 1041

[0048] Mounting port 105

[0049] Upper shell 11

[0050] First cavity 110

[0051] First connection hole 111

[0052] The first half 112

[0053] Lower shell 12

[0054] Second cavity 120

[0055] Connecting column 121

[0056] The third connecting hole 122

[0057] The second half 123

[0058] Wire guide 20

[0059] Wire duct 201

[0060] First section 21

[0061] Second section 22

[0062] Section 3 23

[0063] Fastener 30

[0064] First direction X

[0065] Hot bed movement direction Y

[0066] The second direction Z

[0067] The first angle R

[0068] Mounting surface W

[0069] First inclined surface P

[0070] The following specific implementation methods will further illustrate this application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0071] The following description will refer to the accompanying drawings to more fully describe the contents of this application. Illustrated in the accompanying drawings are exemplary embodiments 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 to make this application thorough and complete and to fully convey the scope of this application to those skilled in the art. Like reference numerals represent identical or similar components.

[0072] The terms used herein are for the purpose of describing specific 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, "includes" and / or "comprising" and / or "having" integers, steps, operations, components and / or components do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0073] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and the content of this application, and will not be interpreted as idealized or overly formal meanings.

[0074] The specific implementation methods of the present application will be described in further detail below with reference to the accompanying drawings.

[0075] As shown in FIG1 , this embodiment provides a 3D printing device 200, comprising a machine platform 210, a motion mechanism 220, a heated bed 230, and a heated bed junction box 100. The machine platform 210 is generally square and is intended to be placed on the ground or a tabletop. The top end surface of the machine platform 210 is arranged horizontally, and the motion mechanism 220 is mounted on the top end surface of the machine platform 210. The motion mechanism 220 is a linear reciprocating mechanism such as a screw slide or a cylinder slide, and is connected to the heated bed 230 in a transmission manner, driving the heated bed 230 to reciprocate in a direction.

[0076] Referring again to Figure 1 , in one embodiment, the 3D printing apparatus 200 further includes a bracket 240 and a nozzle assembly 250. The bracket 240 is fixed to the machine platform 210, and the nozzle assembly 250 is located above the heated bed 230 and is slidably mounted on the bracket 240 along a first direction X, such that the nozzle assembly 250 can slide relative to the heated bed 230 along the first direction X. The first direction X is perpendicular to the heated bed's motion direction Y and lies in the same horizontal plane as the heated bed's motion direction Y.

[0077] It will be appreciated that, in some embodiments, the nozzle assembly 250 may be slidably mounted on the bracket 240 along a second direction Z, where the second direction Z is perpendicular to a horizontal plane in which the first direction X and the heated bed movement direction Y are located, so that the nozzle assembly 250 may be moved closer to or further away from the heated bed 230 along the second direction Z, thereby adjusting the height of the nozzle assembly 250 relative to the heated bed 230.

[0078] Referring again to Figures 1 to 3 , in one embodiment, the 3D printing device 200 further includes a power supply 270. The heated bed 230 includes a heating module (not shown) for heating the heated bed 230. The power supply 270 is connected to the heating module via a wire 260 to supply power to the heating module.

[0079] Along the direction of movement Y of the heated bed, the front surface of the heated bed 230 is provided as a mounting surface W. A wiring portion 231 is protruding from the mounting surface W. The wiring portion 231 is connected to the heated bed 230 or is integrally formed with the heated bed 230. An electrical contact 232 is provided at the bottom end of the wiring portion 231. The electrical contact 232 is electrically connected to the heating module via a wire. After the wire 260 is electrically connected to the electrical contact 232, it forms a current path with the heating module.

[0080] The power supply 270 is located on one side of the heated bed 230 along the first direction X and is mounted on the machine platform 210. The power supply 270 is mounted on the left or right side of the heated bed 230, rather than on the front or rear side of the heated bed 230 along its direction of movement. This is to avoid the need to leave sufficient space between the power supply 270 and the heated bed 230 for the heated bed 230 to move, which would result in the power supply 270 and the heated bed 230 occupying too much space and the required length of the wire 260 being too long.

[0081] It is worth noting that the wiring portion 231 is located on the left or right side of the mounting surface W along the first direction X, that is, on one side of the corner of the heating bed 230. The power supply 270 is located on the other side of the corner of the heating bed 230, thereby reducing the length and wiring space required for the wire 260.

[0082] As shown in Figure 4 , and in conjunction with Figures 1 to 3 , this embodiment provides a heated bed junction box 100 . The heated bed junction box 100 is connected to the connection portion 231 of the heated bed 230 . The heated bed junction box 100 includes a box body 10 and a wire guide 20 . The box body 10 is disposed around the connection portion 231 to protect it from electrical leakage and other accidents. The wire guide 20 is connected to the box body 10 and can be detachably connected or integrally formed with the box body 10.

[0083] A wire groove 201 is defined along the extension of the wire guide 20. The groove 201 is located at the center of the wire guide 20 and extends through opposite ends of the wire guide 20. One end of the wire 260 is secured to the connection portion 231 and electrically connected to the electrical contact 232 of the connection portion 231. The other end of the wire 260 extends through the groove 201, exits the wire guide 20, and is connected to the power source 270.

[0084] The extension direction of the wire trough 201 forms a first angle R with the direction of movement Y of the heated bed. The inner diameter of the wire trough 201 matches the outer diameter of the wire 260, ensuring that the inner circumferential wall of the wire trough 201 at least partially abuts the wire 260, thereby bending the section passing through the wire trough 201 and adjusting the routing direction of the lead end of the wire 260 that exits the wire trough 201. Compared to routing the lead end of the wire 260 parallel to the direction of movement Y of the heated bed, this arrangement of the wire 260 can increase the bending angle of the lead end of the wire 260 relative to the heated bed 230.

[0085] In this way, the heated bed junction box 100 of the present application changes the orientation of the lead-out end of the wire 260 through the wire member 20, so that the bending angle of the lead-out end of the wire 260 relative to the heated bed 230 becomes larger. During the movement of the heated bed 230, the lead-out end of the wire 260 participates in a longer length of the wire 260 segment when bending, thereby avoiding stress concentration when the wire 260 is bent significantly at a smaller length, which may cause the wire 260 to be easily broken, thereby improving the service life of the wire 260.

[0086] 2 to 4 , in one embodiment, one end of the wire guide 20 is connected to a side of the box body 10 away from the heat bed 230 , and the other end of the wire guide 20 is tilted outwardly away from the heat bed 230 .

[0087] Specifically, the box body 10 includes an integrally formed first section 101 and a second section 102. The first section 101 is substantially square in shape, with one end connected to the mounting surface W. The second section 102 is substantially triangular in shape, with one side connected to the other end of the first section 101.

[0088] It is understood that the shape of the first section 101 may also be a trapezoid or other shape. The shape of the second section 102 may also be a semicircular or other shape. In this embodiment, the shapes of the first section 101 and the second section 102 are not specifically limited.

[0089] Along the first direction X, the surface of the second section 102 on the side closest to the power source 270 is configured as a first inclined surface P. The first inclined surface P slopes outward from its end away from the heated bed 230 toward its end closer to the heated bed 230. One end of the wire guide 20 is connected to the first inclined surface P, and the wire guide 201 extends perpendicular to the first inclined surface P, so that the extending direction of the wire guide 201 forms the aforementioned first angle R with the direction Y of movement of the heated bed.

[0090] In particular, the first angle R ranges from 30° to 50°, and is preferably 40°. If the first angle R is too large, the required length of wire 260 will be too large, and the wire 260 will occupy too much space when laid out. If the first angle R is too small, the length of the wire 260 segment involved in the bending of the lead end of the wire 260 will still be too small, and the wire 260 will still be at a greater risk of breaking.

[0091] In addition, the wire 260 is naturally bent and is generally in a curved shape.

[0092] Referring again to Figures 2 to 6 , in one embodiment, a cavity 103 is defined within the housing 10, and the wiring portion 231 is received within the cavity 103. A wire duct 201 communicates with the cavity 103, and one end of the wire 260 is positioned within the cavity 103, with the other end passing through the cavity 103 and the wire duct 201 in sequence.

[0093] Furthermore, a mounting opening 105 is defined on a side of the box body 10 away from the heated bed 230. The mounting opening 105 is located on the first inclined surface P and communicates with the cavity 103. The middle section of the wire guide 20 is retained within the mounting opening 105 to secure the wire guide 20 to the box body 10. One end of the wire guide 20 extends through the mounting opening 105 into the cavity 103, while the other end is located outside the box body 10 to prevent the end of the wire 260 connected to the connector from being exposed.

[0094] The wire guide 20 is made of a soft rubber material to prevent damage to the wire 260 due to friction when in contact with the wire guide 20. The wire guide 20 comprises a first section 21, a second section 22, and a third section 23, which are sequentially connected. The first, second, and third sections 21, 22, 23 are coaxially arranged and integrally formed. Along the extension direction of the first section 21, the second section 22 protrudes outward from the end surface of one end of the first section 21, and the third section 23 protrudes outward from the end surface of the second section 22 away from the first section 21.

[0095] The first section 21 is located inside the cavity 103, and the third section 23 is located outside the cavity 103. The outer diameter of the second section 22 is smaller than the outer diameters of the first and third sections 21, 23, so that a necking structure is formed at the second section 22, thereby clamping the second section 22 in the installation opening 105.

[0096] When the second section 22 is secured to the mounting opening 105, the inner circumference of the mounting opening 105 abuts against the outer circumference of the second section 22, and the end of the first section 21 proximal to the second section 22 abuts against the inner wall of the box body 10, thereby enhancing the stability of the connection between the wire guide 20 and the box body 10. Alternatively, the end of the third section 23 proximal to the second section 22 abuts against the outer wall of the box body 10.

[0097] In particular, the cross-section of the second section 22 is roughly elliptical, so that the second section 22 is roughly a flat structure, and the shape of the mounting opening 105 is adapted to the shape of the second section 22 to prevent the second section 22 from rotating when it is clamped in the mounting opening 105, thereby preventing the wire 260 from twisting when the wire guide 20 rotates.

[0098] Referring again to Figures 5 to 8 , in one embodiment, the housing 10 includes an upper shell 11 and a lower shell 12 . The upper shell 11 and the lower shell 12 have the same shape. The shapes of the upper shell 11 and the lower shell 12 are identical to those described above for the housing 10 and will not be further described here. The upper shell 11 and the lower shell 12 are disposed along the second direction Z on opposite sides of the connection portion 231 and enclose a cavity 103 .

[0099] The upper shell 11 has a first cavity 110 at one end near the connection portion 231 for accommodating the connection portion 231. The lower shell 12 has a second cavity 120 at one end near the connection portion 231. The second cavity 120 communicates with the first cavity 110 and together form the cavity 103.

[0100] In addition, a first half opening 112 is defined in the side wall of the upper shell 11 corresponding to the first inclined surface P, and a second half opening 123 is defined in the side wall of the lower shell 12 corresponding to the first inclined surface P. The first half opening 112 and the second half opening 123 are both semicircular in shape and, when connected, together form the aforementioned mounting opening 105.

[0101] Referring again to FIG. 5 to FIG. 8 , in one embodiment, both the upper shell 11 and the lower shell 12 are connected to the wiring portion 231 .

[0102] Specifically, the upper shell 11 is provided with a first connection hole 111, which passes through the upper shell 11 along the second direction Z. The wiring portion 231 is provided with a second connection hole 2311, which passes through the wiring portion 231 along the second direction Z. A connection column 121 is provided on the bottom wall of the second cavity 120 protruding toward the upper shell 11, and the connection column 121 is provided with a third connection hole 122. The first connection hole 111, the second connection hole 2311, and the third connection hole 122 are correspondingly arranged and are all for fasteners 30 to pass through. The fastener 30 is a screw or bolt, etc. One end of the fastener 30 passes through the first connection hole 111, the second connection hole 2311, and the third connection hole 122 in sequence from the upper side of the upper shell 11, thereby fixing the upper shell 11, the wiring portion 231, and the lower shell 12 to each other.

[0103] Specifically, there are three first connection holes 111, three second connection holes 2311, and three third connection holes 122. The three first connection holes 111 are arranged in a triangular pattern, which can improve the stability of the connection between the upper shell 11, the wiring portion 231, and the lower shell 12 compared to using two first connection holes 111.

[0104] It is understandable that the number of the first connection hole 111 , the second connection hole 2311 , and the third connection hole 122 may also be set to four or five, or a number greater than two.

[0105] Referring again to Figure 8 and Figures 2 and 3 , in one embodiment, the connection portion 231 defines a through-hole 2312 that extends through the connection portion 231 along the second direction Z. The ground wire of the wire 260 is led out from the electrical contact 232 provided at the bottom end of the connection portion 231 and then passes through the through-hole 2312 before abutting against the upper housing 11 , thereby grounding the ground wire and preventing it from being exposed to the housing 10.

[0106] Referring to Figures 7 and 8 and Figure 3 , in one embodiment, the connection portion 231 is provided with a latching slot 2310 on opposite sides along the first direction X. The latching slot 2310 is recessed inwardly from the sidewall of the connection portion 231 and is located at an end of the sidewall of the connection portion 231 that is close to the heated bed 230 .

[0107] An opening 104 is formed at one end of the upper shell 11 near the heated bed 230. Two opposing inner walls of the first cavity 110 along the first direction X are provided with engaging protrusions 1041, located at the end of the upper shell 11 near the heated bed 230. Engaging protrusions 1041 are retained within the engaging slots 2310. Along the heated bed's motion direction Y, one side of the engaging protrusion 1041 abuts the mounting surface W, while the other side abuts the wall of the engaging slot 2310, thereby clamping the engaging protrusion 1041 between the heated bed 230 and the connecting portion 231. Furthermore, the opposing inner walls of the opening 104 along the first direction X abut against the opposing side walls of the connecting portion 231 along the first direction X, respectively, so that the upper shell 11 completely covers the connecting portion 231.

[0108] The specific embodiments of the present application have been described above with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications and substitutions may be made to the specific embodiments of the present application without departing from the scope of the present application. Such modifications and substitutions are within the scope of the present application.

Claims

1. A hot bed junction box, connected to the connection portion of the hot bed, wherein the connection portion is protruding from one side of the hot bed along the direction of movement of the hot bed; characterized in that: The hot bed junction box includes: A box body, arranged on the outside of the wiring portion; A wire member is connected to the box body and is provided with a wire groove. One end of the wire of the hot bed is connected to the wiring portion, and the other end thereof passes through the wire groove. The extension direction of the wire groove is set at a first angle to the movement direction of the hot bed, and the inner peripheral wall of the wire groove at least partially supports the wire, which is used to adjust the layout direction of the wire to increase the bending angle of the end of the wire passing through the wire groove relative to the hot bed.

2. The hot bed junction box according to claim 1, characterized in that: The first angle ranges from 30° to 50°.

3. The hot bed junction box according to any one of claims 1 to 2, characterized in that: One end of the wire member is connected to a side of the box body away from the hot bed, and the other end of the wire member is inclined outwardly in a direction away from the hot bed.

4. The hot bed junction box according to claim 3, characterized in that: A first inclined surface is provided on a side of the box body away from the heated bed. The first inclined surface is inclined outward from an end away from the heated bed toward an end close to the heated bed. One end of the wire member is connected to the first inclined surface, and an extension direction of the wire groove is perpendicular to the first inclined surface.

5. The hot bed junction box according to any one of claims 1 to 4, characterized in that: A cavity is provided inside the box body, the wire groove is connected to the cavity, one end of the wire is located in the cavity and electrically connected to the wiring portion, and the other end thereof passes through the wire groove.

6. The hot bed junction box according to claim 5, characterized in that: A mounting opening is provided on a side of the box body away from the hot bed; The wire guide includes a first section, a second section, and a third section connected in sequence. The outer diameter of the second section is smaller than the outer diameters of the first section and the third section. The second section is clamped in the installation opening.

7. The hot bed junction box according to claim 5, characterized in that: The box body includes an upper shell and a lower shell. The upper shell and the lower shell are respectively arranged on opposite sides of the wiring part and surround the cavity. The upper shell and the lower shell are both connected to the wiring part.

8. The hot bed junction box according to claim 7, characterized in that: The upper shell is provided with a first connection hole, the wiring portion is provided with a second connection hole, and the lower shell is provided with a third connection hole. The first connection hole, the second connection hole, and the third connection hole are arranged correspondingly and are all for fasteners to pass through; the number of the first connection hole, the second connection hole, and the third connection hole is set to three.

9. The hot bed junction box according to claim 5, characterized in that: The connection portion is provided with slots on opposite sides along a first direction, wherein the first direction is perpendicular to the movement direction of the hot bed; An opening is formed at one end of the box body close to the hot bed, the opening communicating with the cavity and allowing the wiring portion to pass through the opening. Two opposite inner walls of the opening along the first direction are provided with snap-fitting protrusions, which are held in the slots.

10. A 3D printing device, characterized in that: The hot bed comprises a machine platform, a motion mechanism, a hot bed and a hot bed junction box according to any one of claims 1 to 9, wherein the motion mechanism is installed on the machine platform, and the motion mechanism is connected to the hot bed in a transmission manner to drive the hot bed to move.

11. The 3D printing device according to claim 10, wherein: The 3D printing device further includes a power supply, which is located on one side of the hot bed along the first direction, and one end of the wire passing through the wire groove is connected to the power supply.

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