CN117656468A - Printing platform, three-dimensional printing equipment and calibration method of printing head assembly - Google Patents
Printing platform, three-dimensional printing equipment and calibration method of printing head assembly Download PDFInfo
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- CN117656468A CN117656468A CN202211065315.5A CN202211065315A CN117656468A CN 117656468 A CN117656468 A CN 117656468A CN 202211065315 A CN202211065315 A CN 202211065315A CN 117656468 A CN117656468 A CN 117656468A
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- 238000007639 printing Methods 0.000 title claims abstract description 269
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010146 3D printing Methods 0.000 title claims abstract description 22
- 230000005611 electricity Effects 0.000 claims abstract description 3
- 238000004140 cleaning Methods 0.000 claims description 35
- 238000003825 pressing Methods 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 8
- 239000004626 polylactic acid Substances 0.000 claims description 8
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 4
- 239000000523 sample Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
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- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
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Abstract
The invention discloses a printing platform, three-dimensional printing equipment and a method for calibrating a printing head assembly, which solve the problem of inaccurate zeroing position of the printing head assembly. The main technical scheme of the invention is as follows: the utility model provides a print platform is applied to three-dimensional printing equipment, three-dimensional printing equipment includes print head subassembly, actuating mechanism and controlling means, and controlling means and actuating mechanism electricity are connected, and controlling means is used for driving actuating mechanism to drive print head subassembly and print platform relative movement, print platform includes: a printing platform body; the calibration piece is arranged on the printing platform body and is electrically connected with the control device so as to send the actual position information of the printing head assembly to the control device under the action of the printing head assembly.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a printing platform, three-dimensional printing equipment and a calibration method of a printing head assembly.
Background
The stereoscopic printing apparatus is a cumulative manufacturing technique. The principle of the three-dimensional printing device is that data and raw materials are put into the three-dimensional printing device, and a machine can build products layer by layer according to a program. In a common hot-melt lamination type printer, a product is formed on a printing platform, and when printing starts, a driving mechanism drives the printing platform and the printing head to return to zero, and the printing head starts to move from the zero position, so that the printing head prints on a preset position of the printing platform.
The accuracy of the zero position is an important basis for guaranteeing the accuracy of the printing position, the existing position zeroing is achieved through a limit switch, as in the patent with the publication number of CN209051036U, a sheet metal base is connected with a left screw rod mechanism and a right screw rod mechanism, a Z-axis limit switch is arranged on a side wing of the left screw rod mechanism, a spray head mechanism installed through a connecting cross rod is arranged between the left extrusion mechanism and the right extrusion mechanism, one end of the connecting cross rod close to the left extrusion mechanism is in threaded connection with an X-axis limit switch, the spray head mechanism determines 0 point of an X-axis through a limit micro switch touching the right end, and a printing platform mechanism determines 0 point of a Y-axis by touching a rear limit switch.
In practical application, due to the fact that the carrying of the printer or the loosening and ageing of parts of the printer are carried out, the positions of the limit switch and the guide mechanism are changed, so that the zero position of the printing head is deviated, namely, when the zero position is caused, the relative position of the printing head and the printing platform is inaccurate, in the printing process, if the printing head prints according to the preset moving distance, the position of the model is deviated relative to the printing platform, and when the size of the model is larger, the boundary of the printing platform is possibly exceeded, and printing failure is caused.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a printing platform, a three-dimensional printing apparatus, and a method for calibrating a printhead assembly, which solve the problem of inaccurate zeroing position of the printhead assembly, and obtain actual position information by acting the printhead assembly on a calibration member, thereby obtaining an offset of the printhead assembly, and compensating the actual position of the printhead assembly according to the offset.
In order to achieve the above purpose, the present invention mainly provides the following technical solutions:
in one aspect, an embodiment of the present invention provides a printing platform, which is applied to a stereoscopic printing device, where the stereoscopic printing device includes a printhead assembly, a driving mechanism, and a control device, the control device is electrically connected to the driving mechanism, and the control device is configured to drive the driving mechanism to drive the printhead assembly and the printing platform to relatively move, and the printing platform includes:
a printing platform body;
the calibration piece is arranged on the printing platform body and is electrically connected with the control device, so that the actual position information of the printing head assembly is sent to the control device under the action of the printing head assembly.
Further, the calibration piece comprises a touch panel, the touch panel is arranged on the upper surface of the printing platform body, and the touch panel is used for being electrically connected with the control device; the printing head component is used for touching the touch panel so that the touch panel can send the actual position information.
Further, the printing platform body comprises a model contact plate, and the coating material of the upper surface of the model contact plate comprises acrylonitrile-butadiene-styrene terpolymer and/or polylactic acid;
the model contact plate comprises a printing plate and a mounting plate, the mounting plate is connected with the printing plate, the printing plate is used for supporting a model, and the calibration piece is arranged on the mounting plate; the coating material of the upper surface of the printing plate comprises acrylonitrile-butadiene-styrene terpolymer and/or polylactic acid;
the printing platform body further includes:
and the heat insulation piece is arranged between the mounting plate and the calibration piece.
Further, the printing platform body further comprises a support frame, at least one sliding part is arranged on the model contact plate, at least one guide rail part is arranged on the support frame, and the sliding part is used for sliding along the guide rail part so as to enable the model contact plate to be connected with the support frame;
The support frame includes bottom plate and supporting rib, the supporting rib with the bottom plate is connected, the supporting rib is used for supporting the model contact plate.
Further, the control device is arranged on the bottom plate of the supporting frame and is used for storing calibration position information and receiving the actual position information;
the printing platform further comprises:
a joint assembly including a first joint and a second joint;
the first connector is arranged on the mounting plate and is electrically connected with the calibration piece; the second connector is arranged on the bottom plate of the support frame and is electrically connected with the control device;
when the model contact plate is connected with the supporting frame, the first connector is electrically connected with the second connector.
Further, the first joint comprises a first joint connecting plate, a first joint pressing plate and a first contact part, wherein the first joint connecting plate is connected with the model contact plate, and the first joint pressing plate is connected with the first joint connecting plate so as to fix the first contact part between the first joint pressing plate and the first joint connecting plate;
the second connector comprises a second connector connecting plate, a second connector pressing plate and a second contact portion, wherein the second connector connecting plate is connected with the supporting frame, and the second connector pressing plate is connected with the second connector connecting plate so as to fix the second contact portion between the second connector pressing plate and the second connector connecting plate.
Further, the cleaning assembly is connected with the printing platform body and used for cleaning a nozzle outlet in the printing head assembly.
Further, the cleaning assembly comprises a connecting frame and a cleaning head, wherein the connecting frame is connected with the printing platform body, and the cleaning head is connected with the connecting frame;
the connecting frame is connected to one side edge of the printing platform body, and/or the connecting frame is rotatably connected with the printing platform body.
On the other hand, the invention also provides a three-dimensional printing device, which comprises the printing platform.
In yet another aspect, the present invention also provides a method of calibrating a printhead assembly, comprising:
driving the printhead assembly to move to zero in a first direction and a second direction;
driving the printing head assembly to move along a third direction and touch the calibration piece, and acquiring actual position information of the printing head assembly, wherein the actual position information comprises coordinate information of the printing head assembly in a first direction and coordinate information of the printing head assembly in a second direction;
determining an offset of the printhead assembly based on the calibration position information and the actual position information;
And compensating the actual position of the printing head assembly according to the offset.
According to the printing platform, the three-dimensional printing equipment and the calibration method of the printing head assembly, which are provided by the embodiment of the invention, the actual position information is obtained mainly through the printing head assembly acting on the calibration piece, so that the offset of the printing head assembly is obtained, and the actual position of the printing head assembly is compensated according to the offset. In the prior art, the position zeroing of the printing head is realized through a limit switch, and the positions of the limit switch and a guide mechanism are changed due to the loosening and ageing of parts of the printer or the machine, so that the zero position of the printing head is deviated, the position of a printing model is deviated relative to a printing platform, and when the size of the model is larger, the model possibly exceeds the boundary of the printing platform, and printing failure is caused. Compared with the prior art, in this application file, actuating mechanism drive print head subassembly moves to trigger limit switch after, and print head subassembly descends and touches the calibration piece, and the calibration piece sends the positional information that can reflect print head subassembly actual position, through actual positional information and calibration positional information's comparison, can obtain the offset of print head subassembly, and then in print head subassembly printing process, compensates the actual position of print head subassembly for the printing position of model is accurate.
Drawings
Fig. 1 is a schematic structural diagram of a printing platform according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a print platform and a printhead assembly according to an embodiment of the present invention at a first view angle;
FIG. 3 is an exploded view of a printing platform and printhead assembly according to an embodiment of the present invention;
fig. 4 is an exploded view of a composition structure of a printing platform according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a part of a structure of a printing platform according to an embodiment of the present invention at a first view angle;
fig. 6 is a schematic structural diagram of a part of a structure of a printing platform at a second view angle according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a joint assembly in a printing platform according to an embodiment of the present invention;
FIG. 8 is an exploded view of a joint assembly of a printing platform according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a print platform and a printhead assembly according to an embodiment of the present invention at a second view angle;
FIG. 10 is a schematic view of a cleaning assembly according to an embodiment of the present invention;
fig. 11 is a flowchart of a calibration method according to an embodiment of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description refers to the specific implementation, structure, characteristics and effects of a printing platform according to the invention with reference to the accompanying drawings and preferred embodiments.
In one aspect, as shown in fig. 1-3, an embodiment of the present invention provides a printing platform, which is applied to a stereoscopic printing device, where the stereoscopic printing device includes a printhead assembly 700, a driving mechanism and a control device 500, the control device 500 is electrically connected to the driving assembly, the control device 500 is used to drive the driving mechanism to drive the printhead assembly 700 and the printing platform to move relatively, and the printing platform includes:
a printing platform body 100;
the calibration piece 200, the calibration piece 200 is disposed on the printing platform body 100, and the calibration piece 200 is used for being connected with the control 500 points, so as to send actual position information of the printing head assembly 700 to the control device 500 under the action of the printing head assembly 700.
The control device 500 is a control chip of the stereoscopic printing device, and controls the overall operation of the stereoscopic printing device.
The driving mechanism comprises an X-axis driving mechanism arranged along a first direction and a Z-axis driving mechanism arranged along a third direction, the X-axis driving mechanism is connected with the Z-axis driving mechanism and can move in the Z direction relative to the Z-axis driving mechanism, the printing head assembly 700 is arranged on the X-axis driving mechanism, and the printing head assembly 700 moves in an X-Z plane under the combined action of the Z-axis driving mechanism and the X-axis driving mechanism. The driving mechanism further comprises a Y-axis driving mechanism arranged along the second direction, the printing platform body 100 is arranged on the Y-axis driving mechanism, the Y-axis driving mechanism is connected with the base of the three-dimensional printing device, and the printing platform body 100 moves in the Y direction under the action of the Y-axis driving mechanism. That is, the drive mechanism moves the printhead assembly 700 relative to the print platform body 100 in three dimensions, the X-axis, the Y-axis, and the Z-axis, for 3D printing. It is understood that the X-axis driving mechanism includes an X-axis driving motor, the Y-axis driving mechanism includes a Y-axis driving motor, the Z-axis driving mechanism includes a Z-axis driving motor, and the control device is respectively connected with the X-axis driving motor, the Y-axis driving motor and the Z-axis driving motor to control the operation of each driving motor.
It will be appreciated that in some embodiments, the printhead assembly 700 may also move in a first direction and a second direction, i.e., in a horizontal plane; the printing platform body 100 moves in a third direction, i.e., vertically. In the present embodiment, the moving directions of the printhead assembly 700 and the printing platform body 100 are not limited.
In one embodiment, the calibration member 200 is a touch panel. The touch panel is arranged on the upper surface of the printing platform body 100 and is used for being connected with the control device point; when the print head assembly 700 touches the touch panel, the touch panel sends out position information, and the position information is the position of the touch point of the print head assembly 700 on the touch panel. It will be appreciated that the calibration member 200 is electrically connected to the control device 500 to send the actual positional information obtained by contact of the printhead assembly 700 and the calibration member 200 to the control device 500. Specifically, a first limit switch is arranged on the X-axis driving mechanism, a second limit switch is arranged on the Y-axis driving mechanism, the X-axis driving mechanism drives the printing head assembly 700 to move in a first direction, and the printing head assembly 700 stops moving in the first direction when the first limit switch is triggered; the Y-axis driving mechanism drives the printing platform to move in a second direction, and when the printing platform triggers the second limit switch, the printing platform stops moving; the print head assembly 700 is then controlled to move in a third direction to contact the calibration member 200, and the calibration member 200 transmits actual position information to the control device 500 when sensing contact with the print head assembly 700, while the control device 500 controls the print head assembly 700 to stop moving in the third direction. Specifically, the first direction, the second direction, and the third direction are perpendicular to each other, and the actual position information is the position information of the print head assembly 700 in the first direction and in the second direction after the three-dimensional printing apparatus performs the zeroing operation. The touch panel may be in various forms, such as one or a combination of an electromagnetic touch panel, a capacitive touch panel and a resistive touch panel.
The following describes a touch panel as an example of a resistive touch panel in detail. The resistive touch panel is in a plate-shaped structure and generally comprises tin oxide conductive glass and a conductive film which are stacked, a separation point is arranged between the upper transparent electrode and the lower transparent electrode, when the surface is subjected to touch pressure, the upper transparent electrode and the lower transparent electrode indirectly circulate and generate potential difference, and the position of the touch point can be obtained according to the potential difference. Before the calibration process, absolute calibration position information of the printhead assembly 700 is set, and the calibration position refers to a position where the printhead assembly 700 should touch on the touch panel after performing the zeroing operation in the first direction and the second direction. In an embodiment, the center point of the touch panel is used as the calibration position of the touch panel, and the adjustment of the touch panel position and the zeroing position of the print head assembly 700 can be performed in the initial debugging process when the stereoscopic printing device leaves the factory, so that after the print head assembly 700 triggers the first limit switch in the first direction and triggers the second limit switch in the second direction, or after the print head assembly 700 triggers the first limit switch in the first direction and the print platform triggers the second limit switch in the second direction, the print head assembly 700 moves along the third direction and the touch position of the touch panel is at the center point of the touch panel, that is, the actual position of the print head assembly 700 coincides with the calibration position.
In the actual use process, since the limit switch needs to be triggered every time the zeroing operation is performed, the sensitivity of the limit switch may be reduced after multiple uses, so that the zeroing position of the printhead assembly 700 is shifted, and thus the position of the touch point of the touch panel is not at the center point, that is, the actual position of the printhead assembly 700 is not coincident with the calibration position. To determine the offset of the actual position of the printhead assembly 700, the touch panel sends touch point position information to the control device 500, which is indicative of the actual position information of the printhead assembly 700. The control device 500 stores the center point position information of the touch panel in advance, and the center point position information indicates the calibration position information of the print head assembly 700, so when the control device 500 receives the actual position information, the offset of the print head assembly 700 is calculated according to the pre-stored center point position information and the received touch point position information, and then the actual position of the print head assembly 700 is compensated according to the offset in the printing process, so that when a model with a large bottom area is printed, the position of the model is prevented from being offset relative to the printing platform, and the model exceeds the boundary of the printing platform, thereby causing printing failure.
Specifically, the touch panel may generate X-axis position information in a first direction and Y-axis position information in a second direction of the printhead assembly 700, which are described in one specific embodiment below. The control device 500 of the stereoscopic printing apparatus stores calibration position information (a 0, b 0) in advance, controls the print head assembly 700 to move on the X-axis and the Y-axis until the limit switch is touched, then controls the print head assembly 700 to move along the Z-axis until the touch panel is touched and then stops, the touch panel acquires actual position information (a 1, b 1) and sends the actual position information to the control device 500, and the control device 500 calculates offset information of the print head assembly 700 according to the calibration position information (a 0, b 0) and the actual position information (a 1, b 1) and compensates the actual position of the print head assembly 700 by using the offset information.
According to the printing platform, the three-dimensional printing equipment and the calibration method of the printing head assembly, which are provided by the embodiment of the invention, the actual position information is obtained mainly through the printing head assembly acting on the calibration piece, so that the offset of the printing head assembly is obtained, and the actual position of the printing head assembly is compensated according to the offset. In the prior art, the position zeroing of the printing head is realized through a limit switch, the sensitivity of the limit switch may be reduced due to the loosening and aging of parts of the printer or the machine, the printing head component is not positioned at a preset position when the limit switch is triggered, so that the zero position of the printing head is offset, the position of a printing model is offset relative to a printing platform, and when the size of the model is larger, the boundary of the printing platform may be exceeded, and printing failure is caused. Compared with the prior art, in this application file, actuating mechanism drive print head subassembly moves to trigger limit switch after, and print head subassembly descends and touches the calibration piece, and the calibration piece sends the positional information that can reflect print head subassembly actual position, through actual positional information and calibration positional information's comparison, can obtain the offset of print head subassembly, and then in print head subassembly printing process, compensates the actual position of print head subassembly for the printing position of model is accurate.
In some embodiments of the present application, the stereoscopic printing apparatus further includes a leveling sensor fixed to the printhead assembly 700 to move with the movement of the printhead assembly 700. When the leveling sensor is in a detection state, the probe is released, and the end part of the probe is closer to the touch panel than the end part of the printing head assembly 700; the leveling sensor is in an idle state with the probe stowed, the end of the probe being farther from the touch panel than the end of the printhead assembly 700. The touch panel can also be used for determining the offset between the leveling sensor and the nozzle, and the specific process is as follows: when the print head assembly 700 contacts the touch panel, the control device 500 also records the Z-axis coordinate information c1 of the print head assembly 700 at the moment; the printing head assembly 700 is controlled to ascend, the leveling sensor is in a detection state, the printing head assembly 700 descends until a probe of the leveling sensor touches the touch panel, descending is stopped, Z-axis coordinate information c2 of the printing head assembly 700 at the moment is recorded, the offset between the leveling sensor and the printing head assembly 700 can be obtained by calculating the difference value of c1 and c2, and after the position of each leveling point of the printing platform is detected by the leveling sensor, the actual position of the printing head assembly 700 can be determined by the offset between the leveling sensor and the printing head assembly 700 without manually adjusting the Z-axis position of the printing head assembly 700 by a user.
In one embodiment, as shown in fig. 3-4, the printing platform body 100 includes a mold contact plate 110, the mold contact plate 110 includes a printing plate and a mounting plate 120, the mounting plate 120 is connected to the printing plate, the printing plate is used for supporting the mold, and the calibration piece 200 is disposed on the mounting plate 120. The print platform body 100 also includes a thermal shield disposed between the mounting plate 120 and the calibration member 200.
Mounting panel 120 is located the coplanar with the printing plate, and is connected with border or one corner of printing plate, in one embodiment, mounting panel 120 and printing plate structure as an organic whole, and mounting panel 120 makes touch panel not occupy the space of printing the region on the printing plate, avoids touch panel to contact high temperature consumptive material. To ensure print quality, the printing plate is typically heated, and to avoid the touch panel from being affected by the high temperature of the printing plate, a thermal insulation member, such as foam or rubber thermal insulation strips, is disposed between the mounting plate 120 and the calibration member 200.
The time that the consumable that heats the printing plate can make to solidify rather than contact increases for the adhesion of the first layer of model and printing plate is better, avoids the model to warp limit or drop and leads to the risk of printing failure in the printing process. However, the heating part is arranged on the printing plate to heat the printing plate, and the power is turned on to conduct electricity, so that the whole cable of the three-dimensional printing device is more; in addition, before printing, the printing plate needs to be preheated to the set temperature to start printing, so that the printing time of the model is increased. To solve the above-mentioned problems, the present application provides an embodiment, by coating the upper surface of the printing plate with a material having good adhesion with the consumable, wherein the coating material includes an acrylonitrile (a) -butadiene (B) -styrene (S) terpolymer (ABS for short), and/or the coating material includes polylactic acid (PLA for short), and since the adhesion between the two coating materials and the consumable is good, the first layer of the model and the printing plate can be well adhered, the printing plate does not need to be heated, and the effect of stabilizing the model can be achieved, and the model is convenient to take down.
In one embodiment, as shown in fig. 3 to 6, to facilitate the installation of the mold contact plate 110, the printing platform body 100 further includes a support frame 130, at least one sliding portion 111 is disposed on the mold contact plate 110, at least one guide rail portion 131 is disposed on the support frame 130, and the sliding portion 111 is configured to slide along the guide rail portion 131, so that the mold contact plate 110 is connected to the support frame 130. The supporting frame 130 includes a bottom plate 132 and supporting ribs 133, the supporting ribs 133 are connected with the bottom plate 132, and the supporting ribs 133 are used for supporting the mold contact plate 110.
Wherein the friction force between the sliding portion 111 and the rail portion 131 is greater than the set threshold value. Specifically, the friction force between the sliding portion 111 and the rail portion 131 is greater than the friction force between the printing platform body 100 and the printhead assembly 700 at the time of printing.
The support 130 includes a bottom plate 132, where the bottom plate 132 is used to connect with the Y-axis driving mechanism, in one embodiment, the bottom plate 132 is connected with four guide wheels 300 of the Y-axis driving mechanism by bolts, the sliding portion 111 and the guide rail portion 131 each have a bending portion, as shown in fig. 5-6, a first row of guide rail portions 1321, a second row of guide rail portions 1322 and a third row of guide rail portions 1323 are provided on the bottom plate 132, four sub-bending portions are provided in any row of guide rail portions, the first row of guide rail portions 1321 and the second row of guide rail portions 1322 are respectively provided at opposite side edges of the bottom plate 132, and the third row of guide rail portions 1323 are provided between the first row of guide rail portions 1321 and the second row of guide rail portions 1322. The mold contact plate 110 is also provided with three rows of sliding parts, and the bending parts of the guide rail part 131 of the mold contact plate 110 are matched with the bending parts of the sliding parts of the bottom plate 132, that is, the directions of the clamping structures of the bending parts of the guide rail part 131 and the sliding parts are opposite, so that the mold contact plate and the sliding part can be mutually in sliding clamping connection.
The support ribs 133 include a first edge support rib 1331, a second edge support rib 1332, and two central support ribs 1333, where the first edge support rib 1331 and the second edge support rib 1332 are respectively located at opposite side edges of the bottom plate 132, and are respectively located at different side edges of the bottom plate 132 with the first row of guide rail portions 1321 and the second row of guide rail portions 1322, so that the first edge support rib 1331, the second edge support rib 1332, the first row of guide rail portions 1321, the second row of guide rail portions 1322, and the bottom plate 132 together enclose the support frame 130 having a channel structure. Two central supporting ribs 1333 are located at both sides of the third row of guide rail portions 1323, which serve the purpose of supporting the mold contact plate 110 by the central region, and ensure the stability of the support of the mold contact plate 110.
In one embodiment, as shown in fig. 5-6, a notch 1334 is provided on the first edge support bar 1331, and the notch 1334 corresponds to the guide rail portion 131. If there are three notches 1334, they correspond to the first row of rail portions 1321, the second row of rail portions 1322, and the third row of rail portions 1323, respectively. When the mold contact plate 110 is installed, the mold contact plate 110 starts from the first edge supporting rib 1331 to push the mold contact plate 110, the sliding part 111 at the bottom end of the mold contact plate 110 passes through the notch 1334 and slides along the guide rail part 131, when the mold contact plate 110 is installed in place, the front end of the sliding part 111 abuts against the second edge supporting rib 1332, the sliding part 111 and the guide rail part 131 are clamped in an interaction manner, and the mold contact plate 100 cannot move relative to the support frame 130 in the printing process due to large friction force between the sliding part 111 and the guide rail part 131.
In one embodiment, as shown in fig. 3 and 7-8, the printing platform further includes a control device 500, where the control device 500 is disposed on the bottom plate 132 of the support 130, and is used to store calibration position information and receive actual position information. The joint assembly 600. The joint assembly 600 includes a first joint 610 and a second joint 620. The first connector 610 is disposed on the mounting board 120 and is electrically connected to the calibration piece 200; the second connector 620 is disposed on the bottom plate 132 of the support 130 and is electrically connected to the control device 500. When the mold contact plate 110 is connected to the supporting frame 130, the first connector 610 and the second connector 620 are electrically connected. It should be understood that the location of the control device 500 is merely an example, and the specific location of the control device 500 is not limited in this application.
The joint assembly 600 may be a magnetic connector, where the first joint 610 and the second joint 620 respectively include a first contact portion 613 and a second contact portion 623, where the first contact portion 613 and the second contact portion 623 are respectively a first terminal and a second terminal of the magnetic connector, the first contact portion 613 and the second contact portion 623 are connected by a mutual attraction manner, a joint for connecting the first contact portion 613 and the second contact portion 623 is respectively provided on the first contact portion 613 and the second contact portion 623, and when the first contact portion 613 and the second contact portion 623 are attracted, the joint is electrically connected, so as to realize the electrical connection between the first contact portion 613 and the second contact portion 623, or the control device 500 and the calibration piece 200, and when the model contact plate 110 is removed and connected by the support frame 130, no connection wire between the calibration piece 200 and the control device 500 is required to be plugged and pulled, so as to avoid the problem of complicated installation or wire connection damage. The supporting frame 130 includes a receiving space surrounded by the supporting ribs 133 and the bottom plate 132, and the joint assembly 600 and the control device 500 are located in the receiving space, so as to protect the joint assembly 600 and ensure the neat appearance of the printing platform body 100. The joint assembly 600 and the control device 500 are respectively located at two sides of a central supporting rib 1333, so that heat transfer and electromagnetic interference between the joint assembly 600 and the control device 500 are avoided, a wiring opening 1335 is formed in the central supporting rib 1333, the wiring opening 1335 can be a notch or a hole, and the joint assembly 600 and the control device 500 are electrically connected through the wiring opening 1335. The connector assembly 600 is disposed near the calibration member 200, and may specifically correspond to the mounting plate 120, so as to avoid the influence of overlong connection lines and high temperature of the mold contact plate 110. In one embodiment, the mounting plate 120 is provided with a mounting groove, and the calibration member 200 is disposed in the mounting groove, so that the upper surface of the calibration member 200 and the upper surface of the model contact plate 110 are located on the same plane, and the bottom of the mounting groove is provided with a through hole 121, and the calibration member 200 is electrically connected with the joint assembly 600 through the through hole 121.
The first contact portion 613 and the second contact portion 623 are generally smaller in size, and connection points are not easily provided, so as to avoid damage to the first contact portion 613 and the second contact portion 623 caused by direct connection on the first contact portion 613 and the second contact portion 623, and to facilitate connection of the first contact portion 613 and the second contact portion 623, in one embodiment, as shown in fig. 8, the first joint 610 includes a first joint connection plate 611, a first joint pressure plate 612, and a first contact portion 613, the first joint connection plate 611 is connected with the mold contact plate 110, and the first joint pressure plate 612 is connected with the first joint connection plate 611 to fix the first contact portion 613 between the first joint pressure plate 612 and the first joint connection plate 611. The second joint 620 includes a second joint connection plate 621, a second joint pressing plate 622, and a second contact portion 623, the second joint connection plate 621 and the second joint pressing plate 622 being connected, the second joint pressing plate 622 being connected with the second joint connection plate 621 to fix the second contact portion 623 between the second joint pressing plate 622 and the second joint connection plate 621.
The first joint connecting plate 611 and the model contact plate 110 can be connected through bolts, the first joint pressing plate 612 and the first joint connecting plate 611 can be connected through bolts, a circle of boss 614 is arranged on the edge of the first contact portion 613, hollowed areas are formed in the first joint pressing plate 612 and the first joint connecting plate 611, the first joint pressing plate 612 and the first joint connecting plate 611 are used for fixing the first contact portion 613 through the boss, and the first contact portion 613 is connected with the second contact portion 623 through the hollowed areas of the first joint pressing plate 612. Similarly, the second joint connection plate 621 is connected with the support frame 130 through bolts, the second joint pressing plate 622 is connected with the second joint connection plate 621 through bolts, a circle of boss 624 is arranged at the edge of the second contact portion 623, hollowed areas are formed in the second joint pressing plate 622 and the second joint connection plate 621, the second joint pressing plate 622 and the second joint connection plate 621 fix the second contact portion 623 through the boss, and the second contact portion 623 is connected with the first contact portion 613 through the hollowed areas of the second joint pressing plate 622.
In one embodiment, as shown in fig. 9-10, the printing platform further comprises a cleaning assembly 400, the cleaning assembly 400 being coupled to the printing platform body 100 for cleaning nozzle outlets in the printhead assembly 700.
The driving mechanism drives the printing head assembly 700 to move to the cleaning assembly 400 position, and the cleaning of the printing resin remained at the nozzle of the printing head assembly 700 is performed through the repeated movement of the printing head assembly 700 or the movement of the cleaning assembly 400.
In one embodiment, as shown in fig. 10, the cleaning assembly 400 includes a carriage 410 and a cleaning head 420, the carriage 410 being coupled to the print platform body 100 and the cleaning head 420 being coupled to the carriage 410. The connecting frame 410 is connected to one side edge of the printing platform body 100, and/or the connecting frame 410 is rotatably connected to the printing platform body 100.
The connection frame 410 may have a plate-shaped structure, one end of the connection frame 410 is connected to the base plate 132, and the other end extends in a direction away from the base plate 132, and the cleaning head 420 is fixed, and the cleaning head 420 may be specifically a brush. The connector 410 keeps the cleaning head 420 at a distance from the mold contact plate 110, so that the mold contact plate 110 is difficult to clean or scratch due to the fact that residual printing consumables fall on the mold contact plate 110 when the cleaning head 420 cleans the nozzles. The connecting frame 410 may be fixedly connected or rotatably connected with the base plate 132, and when the cleaning assembly 400 is used, the connecting frame 410 is rotated to enable the cleaning head 420 to be far away from the model contact plate 110, and after the cleaning head is used, the connecting frame 410 is rotated to enable the cleaning head 420 to be close to the model contact plate 110, so that the cleaning head 420 is accommodated at one side of the model contact plate 110.
In another aspect, the present invention further provides a stereoscopic printing apparatus, including any one of the printing platforms described above, and a base, a printhead assembly 700, and a driving mechanism;
the driving mechanism is connected with the base, and the printing head assembly 700 and the printing platform are respectively connected with the driving mechanism;
the driving mechanism is used for driving the printhead assembly 700 to move relative to the printing platform for 3D printing.
Before printing starts, the actual position of the print head assembly 700 is compensated by the calibration piece 200, the printing platform is leveled based on the compensated actual position, and then 3D printing is performed based on the compensated actual position and the leveling result of the printing platform, so that the position accuracy of the model and the effective forming of the first layer of the model can be ensured.
In still another aspect, as shown in fig. 11, the present invention further provides a method for calibrating a printhead assembly for a stereoscopic printing apparatus, including:
s1: the printhead assembly 700 is driven to move to zero in the first and second directions.
The limit switch comprises a first limit switch in a first direction and a second limit switch in a second direction, wherein the first limit switch is arranged on the X-axis guide frame, and the second limit switch is arranged on the Y-axis guide frame. The control device controls the driving mechanism to drive the printing head assembly 700 to move along the first direction and stop moving after touching the first limit switch to realize zero resetting in the first direction, and then controls the printing head assembly 700 to move along the second direction and stop moving after touching the second limit switch to realize zero resetting in the second direction; or, the control device controls the driving mechanism to drive the printing head assembly 700 to move along the first direction and stop moving after touching the first limit switch to realize zero resetting in the first direction, and drive the printing platform to move along the second direction and stop moving after touching the second limit switch to realize zero resetting in the second direction. At this point, the printhead assembly 700 is in the null position.
S2: the printhead assembly 700 is then driven to move in the third direction and contact the calibration member 200, and actual position information of the printhead assembly 700 is acquired, wherein the actual position information includes coordinate information of the printhead assembly 700 in the first direction and coordinate information in the second direction.
The control of the movement of the print head assembly 700 in the third direction continues until the calibration member 200 is touched, and the calibration member 200 transmits actual position information to the control device 500 when sensing contact with the print head assembly 700, while the control device 500 controls the print head assembly 700 to stop moving in the third direction. The control device 500 stores therein the center point position information of the touch panel, that is, calibration position information (a 0, b 0), and when the print head assembly 700 touches the calibration piece 200, the touch panel acquires actual position information (a 1, b 1) and sends the actual position information to the control device 500, and there may be a deviation between (a 1, b 1) and (a 0, b 0).
The calibration position information comprises coordinate information of a first direction and a second direction.
It will be appreciated that the print head assembly 700 may be driven to move in a third direction to contact the calibration member 200, or the print head assembly 700 may be driven to move to a predetermined position before the print head assembly 700 is driven to move in the third direction to contact the calibration member 200. The movement to the preset position may be in a first direction, a second direction and/or a third direction.
The printhead assembly 700 can also be moved in the first direction and/or the second direction during the process of driving the printhead assembly 700 to move in the third direction and contact the calibration member 200.
S3: an offset of the printhead assembly 700 is determined based on the calibration position information and the actual position information.
The calibration position information is preset and can be stored in a storage device of the stereoscopic printing apparatus. The control device 500 receives the actual position information (a 1, b 1), and the control device 500 calculates the offset information of the printhead assembly 700 from the calibration position information (a 0, b 0) and the actual position information (a 1, b 1).
S4: the actual position of the printhead assembly 700 is compensated based on the offset.
During printing, the actual position of the print head assembly 700 is compensated according to the offset information, so that when a model with a large bottom area is printed, the position of the model is prevented from being offset relative to the printing platform and exceeding the boundary of the printing platform, and printing failure is prevented.
In some embodiments of the present application, the stereoscopic printing apparatus further comprises a leveling sensor, and the calibration method further comprises:
s5: when the print head assembly 700 moves along the third direction and touches the calibration member 200, the first height information of the print head assembly 700 in the third direction is also acquired.
When the print head assembly 700 touches the calibration piece, the calibration piece 200 sends a touch signal to the control device 500, and the control device 500 also obtains the first height information c1 of the print head assembly 700 in the third direction at this time, that is, the print head assembly 700 touches the calibration piece 200 when the print head assembly 700 is at the first height.
S6: the print head assembly 700 is controlled to ascend, the leveling sensor is in a detection state, the leveling sensor is controlled to move along the third direction and touch the calibration piece 200, and second height information of the print head assembly 700 in the third direction is acquired. It will be appreciated that when the printhead assembly is in contact with the calibration piece 200, the leveling sensor is in an idle state, i.e., the probe end of the leveling sensor is not in contact with the calibration piece 200. The control device switches the leveling sensor into a detection state, controls the printing head assembly 700 to move along the third direction so as to drive the leveling sensor to descend, when the probe end part of the leveling sensor touches the calibration piece 200, the calibration piece 200 sends a touch signal to the control device, the control device controls the printing head assembly 700 to stop moving, and records the second height c2 of the printing head assembly at the moment, namely, the printing head assembly 700 touches the calibration piece 200 under the condition of the second height, and the printing head assembly 700 does not touch the calibration piece.
S7: the offset between the printhead assembly 700 and the leveling sensor is obtained based on the first and second height information.
The control device calculates the offset between the leveling sensor and the printhead assembly according to the first height information c1 and the second height information c2 of the printhead assembly 700, and then detects the position of each leveling point of the printing platform through the leveling sensor, and then can determine the actual position of the printhead assembly 700 through the offset between the leveling sensor and the printhead assembly 700 without manually adjusting the position of the printhead assembly 700 in the third direction by a user.
In one aspect, an embodiment of the present invention provides a printing platform, which is applied to a stereoscopic printing device, where the stereoscopic printing device includes a printhead assembly 700, a driving mechanism and a control device 500, the control device 500 is electrically connected to the driving mechanism, the control device 500 is used to drive the driving mechanism to drive the printhead assembly 700 and the printing platform to relatively move, and the printing platform includes:
a printing platform body 100;
the calibration piece 200, the calibration piece 200 is disposed on the printing platform body 100, and the calibration piece 200 is used for being electrically connected with the control device 500, so as to send actual position information of the printhead assembly 700 to the control device 500 under the action of the printhead assembly 700.
The calibration piece 200 includes a touch panel, the touch panel is disposed on the upper surface of the printing platform body 100, and the touch panel is electrically connected to the control device 500; the print head assembly 700 is used to touch the touch panel so that the touch panel transmits actual position information.
Wherein the printing platform body 100 includes a mold contact plate 110, and a coating material of an upper surface of the mold contact plate 110 includes acrylonitrile-butadiene-styrene terpolymer and/or polylactic acid;
the model contact plate 110 comprises a printing plate and a mounting plate 120, the mounting plate 120 is connected with the printing plate, the printing plate is used for bearing a model, and the calibration piece 200 is arranged on the mounting plate 120;
the printing platform body 100 further includes a heat insulator disposed between the mounting plate 120 and the calibration member 200; the coating material of the upper surface of the printing plate comprises acrylonitrile-butadiene-styrene terpolymer and/or polylactic acid.
The printing platform body 100 further comprises a support frame 130, at least one sliding part 111 is arranged on the model contact plate 110, at least one guide rail part 131 is arranged on the support frame 130, and the sliding part 111 is used for sliding along the guide rail part 131 so as to connect the model contact plate 110 with the support frame 130;
the supporting frame 130 includes a bottom plate 132 and supporting ribs 133, the supporting ribs 133 are connected with the bottom plate 132, and the supporting ribs 133 are used for supporting the mold contact plate 110.
The control device 500 is disposed on the bottom plate 132 of the support 130, and is used for storing calibration position information and receiving actual position information;
the printing platform further comprises: a joint assembly 600, the joint assembly 600 comprising a first joint 610 and a second joint 620;
the first connector 610 is disposed on the mounting board 120 and is electrically connected to the calibration piece 200; the second connector 620 is disposed on the bottom plate 132 of the support 130 and is electrically connected to the control device 500;
when the mold contact plate 110 is connected to the supporting frame 130, the first connector 610 and the second connector 620 are electrically connected.
Wherein the first joint 610 includes a first joint connection plate 611, a first joint pressing plate 612, and a first contact portion 613, the first joint connection plate 611 is connected with the model contact plate 110, and the first joint pressing plate 612 is connected with the first joint connection plate 611 to fix the first contact portion 613 between the first joint pressing plate 612 and the first joint connection plate 611;
the second joint 620 includes a second joint connection plate 621, a second joint pressing plate 622, and a second contact portion 623, the second joint connection plate 621 and the second joint pressing plate 622 being connected, the second joint pressing plate 622 being connected with the second joint connection plate 621 to fix the second contact portion 623 between the second joint pressing plate 622 and the second joint connection plate 621.
The printing platform further comprises a cleaning assembly 400, wherein the cleaning assembly 400 is connected with the printing platform body 100 and is used for cleaning nozzle outlets in the printing head assembly 700.
Wherein the cleaning assembly 400 comprises a connection frame 410 and a cleaning head 420, the connection frame 410 is connected with the printing platform body 100, and the cleaning head 420 is connected with the connection frame 410;
the connecting frame 410 is connected to one side edge of the printing platform body 100, and/or the connecting frame 410 is rotatably connected to the printing platform body 100.
On the other hand, the invention also provides a three-dimensional printing device which comprises any one of the printing platforms.
In still another aspect, the present invention also provides a method of calibrating a printhead assembly for a stereoscopic printing apparatus, comprising:
driving the printhead assembly 700 to move to zero in a first direction and a second direction;
driving the printing head assembly 700 to move along the third direction and touch the calibration piece 200, and acquiring actual position information of the printing head assembly 700, wherein the actual position information comprises zero coordinates of the printing head assembly in the first direction and zero coordinates of the printing head assembly in the second direction;
determining an offset of the printhead assembly 700 based on the calibration position information and the actual position information;
the actual position of the printhead assembly 700 is compensated based on the offset.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a print platform, its characterized in that is applied to three-dimensional printing apparatus, three-dimensional printing apparatus includes print head subassembly, actuating mechanism and controlling means, controlling means with actuating mechanism electricity is connected, controlling means is used for the drive actuating mechanism, in order to drive print head subassembly with print platform relative movement, print platform includes:
a printing platform body;
the calibration piece is arranged on the printing platform body and is electrically connected with the control device, so that the actual position information of the printing head assembly is sent to the control device under the action of the printing head assembly.
2. The printing platform of claim 1, wherein the printing platform comprises a plurality of printing stations,
the calibration piece comprises a touch panel, the touch panel is arranged on the upper surface of the printing platform body, and the touch panel is used for being electrically connected with the control device; the printing head component is used for touching the touch panel so that the touch panel can send the actual position information.
3. The printing platform of claim 2, wherein the printing platform comprises a plurality of printing stations,
the printing platform body comprises a model contact plate, and a coating material of the upper surface of the model contact plate comprises acrylonitrile-butadiene-styrene terpolymer and/or polylactic acid;
the model contact plate comprises a printing plate and a mounting plate, the mounting plate is connected with the printing plate, the printing plate is used for supporting a model, and the calibration piece is arranged on the mounting plate; the coating material of the upper surface of the printing plate comprises acrylonitrile-butadiene-styrene terpolymer and/or polylactic acid;
the printing platform body further includes:
and the heat insulation piece is arranged between the mounting plate and the calibration piece.
4. The printing platform of claim 3, wherein the printing platform comprises a plurality of printing stations,
the printing platform body further comprises a support frame, at least one sliding part is arranged on the model contact plate, at least one guide rail part is arranged on the support frame, and the sliding part is used for sliding along the guide rail part so as to enable the model contact plate to be connected with the support frame;
the support frame includes bottom plate and supporting rib, the supporting rib with the bottom plate is connected, the supporting rib is used for supporting the model contact plate.
5. The printing platform of claim 4, wherein the control device is disposed on a bottom plate of the support frame and is configured to store calibration position information and receive the actual position information;
the printing platform further comprises:
a joint assembly including a first joint and a second joint;
the first connector is arranged on the mounting plate and is electrically connected with the calibration piece; the second connector is arranged on the bottom plate of the support frame and is electrically connected with the control device;
when the model contact plate is connected with the supporting frame, the first connector is electrically connected with the second connector.
6. The printing platform of claim 5, wherein the print platform comprises a plurality of print stations,
the first joint comprises a first joint connecting plate, a first joint pressing plate and a first contact part, the first joint connecting plate is connected with the model contact plate, and the first joint pressing plate is connected with the first joint connecting plate so as to fix the first contact part between the first joint pressing plate and the first joint connecting plate;
the second connector comprises a second connector connecting plate, a second connector pressing plate and a second contact portion, wherein the second connector connecting plate is connected with the supporting frame, and the second connector pressing plate is connected with the second connector connecting plate so as to fix the second contact portion between the second connector pressing plate and the second connector connecting plate.
7. The printing platform of claim 1, further comprising:
and the cleaning assembly is connected with the printing platform body and is used for cleaning a nozzle outlet in the printing head assembly.
8. The printing platform of claim 1, wherein the printing platform comprises a plurality of printing stations,
the cleaning assembly comprises a connecting frame and a cleaning head, the connecting frame is connected with the printing platform body, and the cleaning head is connected with the connecting frame;
the connecting frame is connected to one side edge of the printing platform body, and/or the connecting frame is rotatably connected with the printing platform body.
9. A stereoscopic printing device comprising a printing platform according to any one of claims 1 to 8.
10. A method of calibrating a printhead assembly, comprising:
driving the printhead assembly to move to zero in a first direction and a second direction;
driving the printing head assembly to move along a third direction and touch the calibration piece, and acquiring actual position information of the printing head assembly, wherein the actual position information comprises coordinate information of the printing head assembly in a first direction and coordinate information of the printing head assembly in a second direction;
Determining an offset of the printhead assembly based on the calibration position information and the actual position information;
and compensating the actual position of the printing head assembly according to the offset.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211065315.5A CN117656468A (en) | 2022-09-01 | 2022-09-01 | Printing platform, three-dimensional printing equipment and calibration method of printing head assembly |
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| CN202211065315.5A CN117656468A (en) | 2022-09-01 | 2022-09-01 | Printing platform, three-dimensional printing equipment and calibration method of printing head assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117872030A (en) * | 2024-03-12 | 2024-04-12 | 东莞市楷德精密机械有限公司 | Quartz crystal test head |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117872030A (en) * | 2024-03-12 | 2024-04-12 | 东莞市楷德精密机械有限公司 | Quartz crystal test head |
| CN117872030B (en) * | 2024-03-12 | 2024-05-28 | 东莞市楷德精密机械有限公司 | Quartz crystal test head |
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