CN219095919U - Forming platform and three-dimensional forming equipment - Google Patents

Abstract

The utility model discloses a three-dimensional forming device, which mainly comprises an integrally formed platform body, wherein the heating part is used for realizing partition heating, and meanwhile, the integrity of a forming platform and the surface flatness are ensured, and the printing precision is ensured. The main technical scheme of the utility model is as follows: a molding platform, comprising: the platform body is of an integrated structure and comprises at least two heating areas; the heating device comprises at least two heating pieces, wherein the heating pieces are connected with a platform body, a heating area corresponds to at least one heating piece, and the heating pieces are used for heating the heating area. The utility model is mainly used for heating and supporting the printing model.

Description

Forming platform and three-dimensional forming equipment

Technical Field

The utility model relates to the technical field of 3D printing, in particular to a forming platform and three-dimensional forming equipment.

Background

The stereolithography apparatus achieves stereolithography through additive manufacturing. The principle of the three-dimensional forming equipment is that slice data of a printing model are transmitted to a controller, the controller controls the printing head and the forming platform to move relatively through a transmission mechanism, and meanwhile, nozzles of the printing head spray molten printing consumables to the forming platform, and three-dimensional printing is realized through layer-by-layer lamination type spraying. The first layer of the printing model has important significance on accurate forming of the model, and the first layer of the printing model is adhered to the forming platform in a molten state by heating the forming platform, so that the printing model cannot displace or separate from the forming platform, and stability of the model in a printing process is guaranteed.

In the prior art, in order to ensure heating efficiency and save energy consumption, a plurality of independently heatable hot beds are generally adopted for mutual splicing to form a spliced forming platform, and the aim of saving energy is achieved by controlling the heating of each hot bed sheet. As in the patent publication No. CN214491618U, a zone heating device based on an industrial grade 3D printer is disclosed, comprising a first thermal bed, a second thermal bed and a third thermal bed arranged on an inner frame, and the second thermal bed and the third thermal bed are heated by independent zone heating control members. The hot beds are required to be spliced, gaps and height differences can be generated between the hot beds, the surface of a spliced forming platform is not smooth enough, the inclination looseness of the printing model is easy to cause, and the forming precision of the printing model is affected.

Disclosure of Invention

In view of the above, the embodiment of the utility model provides a forming platform and a three-dimensional forming device, which solve the problem that the surface of the existing spliced forming platform is not smooth enough.

In order to achieve the above purpose, the present utility model mainly provides the following technical solutions:

in one aspect, the present utility model provides a molding platform for a stereoscopic molding apparatus, the molding platform comprising:

The platform body is of an integrated structure and comprises at least two heating areas;

the heating device comprises at least two heating pieces, wherein the heating pieces are connected with a platform body, a heating area corresponds to at least one heating piece, and the heating pieces are used for heating the heating area.

Wherein the platform body further comprises at least one thermal shield positioned between adjacent heating zones, the thermal shield being configured to block heat transfer between adjacent heating zones.

Wherein the heat insulating piece comprises a hollow and/or a groove;

the forming platform also comprises a filling piece, the filling piece is embedded into the hollow or groove, and the filling piece is made of heat insulation materials;

the distance between the hollows is 1mm-5mm, the width of the hollows is 1mm-5mm, and the length of the hollows is 10mm-50mm;

or the interval between the grooves is 1mm-5mm, the width of the grooves is 1mm-5mm, and the length of the grooves is 10mm-50mm.

Wherein, at least two heating regions include central heating region and peripheral heating region, and the center of central heating region and the center coincidence of platform body, peripheral heating region is around central heating region a week.

Wherein the area of the central heating area occupies one ninth to four ninth of the area of the platform body; the central heating area is a round area or a square area;

The forming platform further comprises: the temperature measuring piece is connected with the platform body, the central heating area corresponds to the temperature measuring piece, and the temperature measuring piece is used for detecting the temperature of the central heating area;

the heating elements are in one-to-one correspondence with the heating areas, and the heating elements cover the heating areas;

the platform body comprises a bearing surface and a heating surface which are opposite to each other, the bearing surface is used for connecting the printing model, the heating piece comprises a metal coating covered on the heating surface, and the metal coating is used for electrifying and heating;

an insulating coating is arranged between the platform body and the heating piece.

Wherein, the shaping platform still includes: one end of the change-over switch is respectively and electrically connected with at least two heating pieces, the other end of the change-over switch is electrically connected with a power supply, and the change-over switch is used for controlling the power supply of the heating pieces;

the change-over switch comprises a mechanical switch and is arranged on a base of the three-dimensional forming equipment;

and/or the change-over switch comprises an electric control switch, and the change-over switch is used for being electrically connected with a main controller of the three-dimensional forming equipment.

Wherein, the shaping platform still includes: at least two temperature measuring pieces, temperature measuring piece and platform body coupling, heating region corresponds with at least one temperature measuring piece, and temperature measuring piece is used for detecting the temperature of heating region.

Wherein, the platform body is provided with a temperature measuring hole, and the temperature measuring piece is arranged in the temperature measuring hole;

the heating piece is provided with an avoidance hole, the avoidance hole is correspondingly arranged with the temperature measuring hole, and the diameter of the avoidance hole is larger than the inner diameter of the temperature measuring hole.

Wherein, the shaping platform still includes: the magnetic attraction piece is connected with the platform body, and is used for magnetically attracting the model contact plate, and the model contact plate is used for connecting a printing model.

On the other hand, the utility model also provides a three-dimensional forming device which comprises the forming platform of any one of the above steps, and

a base, a guide drive mechanism, and a printhead assembly;

the guide driving mechanism is connected with the base, the printing head assembly and the forming platform are respectively connected with the guide driving mechanism, and the guide driving mechanism is used for driving the printing head assembly to move relative to the forming platform so as to carry out three-dimensional forming.

The guide driving mechanism comprises a Z-axis guide piece and an X-axis guide assembly, the X-axis guide assembly comprises an X-axis guide section bar, a slide bar and a driving assembly, and the printing head assembly comprises a printing head body, a movable frame and rollers;

the X-axis guide section bar is connected with the Z-axis guide piece, the driving component is connected with the X-axis guide section bar and the movable frame, and the printing head body and the roller are respectively arranged on two opposite sides of the movable frame;

The X-axis guide profile comprises an X-axis guide profile body, a rolling groove, a sliding rod part, a rolling groove and a roller, wherein the X-axis guide profile body is provided with a mounting groove on two sides of the X-axis guide profile body, the mounting groove extends in the X-axis direction, the rolling groove is opposite to the mounting groove in the circumferential direction of the roller, the sliding rod part is embedded into the mounting groove and is located between the rolling groove and the mounting groove, the inner wall of the rolling groove is abutted to the outer wall of the sliding rod, and the roller is used for rolling on the sliding rod.

The driving assembly comprises a power piece, a transmission belt and two synchronous wheels, wherein the power piece is connected with the X-axis guide section bar, the synchronous wheels are respectively arranged at the output end of the power piece and on the X-axis guide section bar, the transmission belt surrounds the synchronous wheels, and the transmission belt is connected with the movable frame;

the X-axis guide profile is also provided with a yielding groove, and the transmission belt is positioned in the yielding groove;

the printing head body comprises a heat dissipation piece, a throat pipe connected with the heat dissipation piece, a heating block in threaded connection with the throat pipe, and a nozzle in threaded connection with the heating block; the outer diameter of the throat pipe, which is close to one end of the nozzle, is smaller than the outer diameter of the end of the nozzle, which is close to the throat pipe; the end of the nozzle, which is close to the throat pipe, is provided with an unset threaded section, and the length of the unset threaded section is 0.5mm-4mm.

According to the forming platform and the three-dimensional forming equipment, the integrally formed platform body is arranged, and the heating piece is used for realizing partition heating, so that the integrity of the forming platform and the flatness of the surface are ensured, and the printing precision is ensured. In the prior art, by adopting independently heated hot beds for splicing, gaps and height differences can be generated between the hot beds, so that the surface of a spliced forming platform is not smooth enough, the inclination looseness of a printing model is easily caused, and the forming precision of the printing model is influenced. Compared with the prior art, in this application file, the platform body is integrated into a whole structure, divide two at least heating zone on the platform body, every heating zone corresponds and sets up the heating piece, heats the heating zone that the printing model is located through the heating piece, realizes carrying out the local heating of platform body according to the printing demand, saves the consumption, when improving heating efficiency, because the platform body is an integer for the difference in height can not appear in the platform body, guarantees that the platform body surface is level and smooth, guarantees the printing precision.

Drawings

Fig. 1 is a schematic structural diagram of a molding platform according to an embodiment of the present utility model at a first view angle;

FIG. 2 is a schematic view of a part of the forming table shown in FIG. 1;

FIG. 3 is a schematic structural diagram of a molding platform according to an embodiment of the present utility model at a second view angle;

FIG. 4 is a schematic structural diagram of another molding platform according to an embodiment of the present utility model;

FIG. 5 is a schematic structural view of another molding platform according to an embodiment of the present utility model;

FIG. 6 is a schematic structural diagram of a molding platform and a printing mold according to an embodiment of the present utility model;

FIG. 7 is a schematic structural diagram of a molding platform and another printing model according to an embodiment of the present utility model;

FIG. 8 is a schematic structural diagram of a molding platform according to an embodiment of the present utility model at a third view angle;

FIG. 9 is a schematic view of a part of the forming table in area B of FIG. 8;

FIG. 10 is a schematic view of a partial structure of the molding platform shown in FIG. 8 in the area A;

FIG. 11 is a schematic structural view of another molding platform according to an embodiment of the present utility model;

fig. 12 is a schematic structural diagram of a stereoscopic molding apparatus according to an embodiment of the present utility model;

fig. 13 is a schematic structural view of an X-axis guiding profile, a sliding rod, a movable frame, rollers and a driving belt in a three-dimensional molding device according to an embodiment of the present utility model;

FIG. 14 is a schematic view of a Z-axis guide, an X-axis guide assembly, and a printhead assembly in a first view of a stereolithography apparatus according to an embodiment of the present utility model;

fig. 15 is a schematic structural view of a Z-axis guide, an X-axis guide assembly, a movable frame, and a roller in a first view angle in a stereoscopic molding apparatus according to an embodiment of the present utility model;

fig. 16 is a schematic structural view of a Z-axis guide, an X-axis guide assembly, a movable frame, and a roller in a second view angle in a stereoscopic molding apparatus according to an embodiment of the present utility model;

FIG. 17 is a schematic diagram of a driving belt, X-axis guiding profile and movable frame in a three-dimensional molding apparatus according to an embodiment of the present utility model;

FIG. 18 is a schematic cross-sectional view of a printhead body according to an embodiment of the utility model;

fig. 19 is a partially enlarged schematic view of the structure at a in fig. 18.

Detailed Description

In order to further describe the technical means and effects adopted by the utility model to achieve the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects of the forming platform according to the utility model with reference to the attached drawings and the preferred embodiment.

As shown in fig. 1, an embodiment of the present utility model provides an aspect, and the present utility model provides a molding platform for a stereoscopic molding apparatus, where the molding platform includes:

the platform body 100, the platform body 100 is an integral structure, including at least two heating areas;

at least two heating elements 200, the heating elements 200 are connected with the platform body 100, the heating area corresponds to at least one heating element 200, and the heating elements 200 are used for heating the heating area.

The forming platform is used for being fixed on a guide driving mechanism of the three-dimensional forming equipment so as to realize the coating of consumable materials by moving relative to the printing head component. The platform body 100 is an integral body, and is uniform in material quality and flat in surface, for example, the platform body 100 is an integral plate-shaped structure prepared by adopting a heat conducting material, and can be prepared by adopting an aluminum material, so that the heat conducting performance is good and the weight is light. The heating area is an area divided on the stage body 100, and the division of the area can be performed by molding stage coordinates in a computer program of the stereoscopic molding apparatus, and does not correspond to a change in the structure of the solid. One or more heating elements 200 are connected to each heating area, and each heating area can be independently heated by controlling whether the heating elements 200 are heated or not. In the printing process, a heating area corresponding to the printing model 600 is determined according to the connection position of the first layer of the printing model 600 and the forming platform, then the heating piece 200 in the heating area corresponding to the printing model 600 is started to start heating, and the heating pieces 200 in other heating areas are not heated, so that local heating according to the position of the printing model 600 is realized, and the problems of low power consumption and low heating efficiency caused by heating of the whole platform body 100 are avoided.

The heating area can be divided according to the use characteristics of the forming platform, for example, the printing model 600 with higher printing frequency is a solid model with smaller volume, for example, an approximately cylindrical cup, the printing position is the middle area of the forming platform, the forming platform can be divided into two heating areas, namely, a central heating area comprising the center of the forming platform and a peripheral heating area surrounding the central heating area for a circle and extending to the edge of the forming platform, the central heating area can be a square area or a round area, the area of the central heating area is larger than the area of the bottom surface of the cup, when the cup is printed, only the central heating area is heated, the bottom end of the cup can be ensured to be adhered to the forming platform, and the peripheral heating area is not heated, so that the energy-saving effect is achieved. Or, if the printing model 600 with higher printing frequency is a solid model with larger extension range, such as a long stick with a square end surface, the printing position is an area covering the center of the forming platform and extending along the X-axis direction, the forming platform can be divided into a front heating area, an intermediate heating area and a rear heating area which are distributed in parallel in the Y-direction on the forming platform, the width of the intermediate heating area in the Y-direction is larger than that of the long stick, when the long stick is printed, only the intermediate heating area is heated, the long stick can be ensured to be adhered to the forming platform, and the front heating area and the rear heating area are not heated, so that the energy-saving effect is achieved. Alternatively, if the printing model 600 with higher printing frequency is a hollow model with larger extension range, such as a cylinder or a photo frame, the forming platform can be divided into two heating areas, one including a central heating area of the center of the forming platform and one peripheral heating area surrounding the central heating area and extending to the edge of the forming platform, and the peripheral heating area is heated when the cylinder or the photo frame is printed. The application does not limit the division of heating area, aims at carrying out energy-conserving technical scheme that prints through regional heating and shaping platform local heating all should belong to this application protection scope.

According to the forming platform and the three-dimensional forming equipment, the integrally formed platform body is arranged, and the heating piece is used for realizing partition heating, so that the integrity of the forming platform and the flatness of the surface are ensured, and the printing precision is ensured. In the prior art, by adopting independently heated hot beds for splicing, gaps and height differences can be generated between the hot beds, so that the surface of a spliced forming platform is not smooth enough, the inclination looseness of a printing model is easily caused, and the forming precision of the printing model is influenced. Compared with the prior art, in this application file, the platform body is integrated into a whole structure, divide two at least heating zone on the platform body, every heating zone corresponds and sets up the heating piece, heats the heating zone that the printing model is located through the heating piece, realizes carrying out the local heating of platform body according to the printing demand, saves the consumption, when improving heating efficiency, because the platform body is an integer for the difference in height can not appear in the platform body, guarantees that the platform body surface is level and smooth, guarantees the printing precision.

In one embodiment, as shown in fig. 1-3, the platform body 100 further includes at least one thermal shield positioned between adjacent heating zones, the thermal shield configured to block heat transfer between the adjacent heating zones.

Because the platform body 100 has thermal conductivity, and the platform body 100 is an integral body, in the process of heating a certain heating area, the adjacent heating areas which are not in a heating state can be heated up through heat transfer, and in order to reduce the temperature loss of the heating areas in the heating state, a heat insulation piece is arranged between the adjacent heating areas. The heat insulating member may be formed on the platform body 100, for example, in an embodiment, the heat insulating member is a hollow 130 on the platform body 100, the platform body 100 includes a bearing surface and a heating surface opposite to each other, the bearing surface is used for connecting the printing model 600, the heating surface is used for connecting the heating member 200, and heat is transferred to the bearing surface through the heating surface to heat the printing model 600. The hollow 130 is a through hole penetrating through the bearing surface and the heating surface of the platform body 100, and the through hole may be a cylindrical hole or a strip hole. The plurality of hollows 130 are arranged at intervals and are arranged along the connection positions of the adjacent heating areas. Alternatively, in some other embodiments, the heat insulating member is at least one groove on the platform body 100, the opening of the groove may be formed on one of the carrying surface and the heating surface, or the grooves may be formed on the carrying surface and the heating surface respectively, and the number of the grooves may be only one, for example, the grooves may surround the heating area for a circle, or the number of the grooves may be plural, and the plural grooves are arranged at intervals and are arranged along the connection positions of the adjacent heating areas. The hollow 130 or the groove still has a fixed connection relationship between the adjacent heating areas, so that the platform body 100 is still an integral body, and meanwhile, the connection relationship between the adjacent heating areas is weakened, so that heat transfer is weakened, and the heating efficiency of the heating areas in a heating state is ensured. In one embodiment, as shown in fig. 2, the distance L between the hollows 130 is greater than or equal to 1mm, so as to ensure the connection strength between adjacent heating areas, avoid bending the areas provided with the hollows 130, avoid sinking any heating area, ensure the distribution quantity or density of the hollows 130, and ensure the heat insulation effect of the hollows 130. The width z of the hollow 130 is 1mm-5mm, the length g of the hollow 130 is 10mm-50mm, the hollow 130 is ensured to be large enough to ensure the heat insulation effect, the temperature defect of the platform body 100 at the hollow 130 caused by the overlarge hollow 130 is avoided, and the structural strength defect of the platform body 100 is avoided. In one embodiment, the spacing between the grooves is greater than or equal to 1 millimeter, so that the connection strength between adjacent heating areas is ensured, bending of the groove areas is avoided, sinking of any heating area is avoided, the spacing between the grooves is less than or equal to 5mm, the distribution quantity or density of the grooves is ensured, and the heat insulation effect of the grooves is ensured. The width of the groove is 1mm-5mm, the length of the groove is 10mm-50mm, the groove is ensured to be large enough to ensure the heat insulation effect, the temperature defect of the platform body 100 at the groove caused by the overlarge groove is avoided, and the structural strength defect of the platform body 100 is avoided.

In one embodiment, the molding platform further comprises a filling member, the filling member is embedded into the hollow 130 or the groove, and the filling member is made of a heat-insulating material.

The filling member can be made of heat insulation materials such as rubber or foam, and is filled in the hollow 130 or the groove to further block heat transfer, so that heat transfer caused by high air temperature in the hollow 130 when the hollow 130 is narrower is avoided.

In one embodiment, the at least two heating zones include a central heating zone 110, the center of the central heating zone 110 coinciding with the center of the platen body 100. The at least two heating zones further comprise a peripheral heating zone 120, the peripheral heating zone 120 surrounding the central heating zone 110 for one week. The central heating region 110 is a circular region or a square region.

The outer circumferential heating zones 120 may be one or more, and when the outer circumferential heating zones 120 are a plurality, as shown in fig. 4, the outer circumferential heating zones 120 may each be an annular zone, and the plurality of outer circumferential heating zones 120 are sequentially arranged around the central heating zone 110 in a direction away from the center of the platen body 100. Alternatively, as shown in fig. 5, a plurality of peripheral heating regions 120 are distributed around the central heating region 110 for one week, for example, four peripheral heating regions 120 are formed in the same shape and surround the central heating region 110 for one week. In one embodiment, as shown in fig. 1-3, the number of the peripheral heating areas 120 is one, the platform body 100 includes a central heating area 110, a heat insulating member and peripheral heating areas 120, the central heating area 110 is a square area, the central heating area 110 is located at the center of the platform body 100, the heat insulating member is a plurality of hollow-outs 130, the plurality of hollow-outs 130 are arranged at intervals and surround the central heating area 110 for a week, the number of the hollow-outs 130 may be sixteen, the peripheral heating area 120 surrounds the heat insulating member for a week, and the peripheral heating area 120 extends to the edge of the forming platform. Since the printing process is generally performed at the middle position of the forming platform, the central heating area 110 located at the middle position is set, and only the middle position of the forming platform is heated, so that the printing process can adapt to the printing requirements of most printing models 600, as shown in fig. 6, the printing models 600 are located in the central heating area 110, only the central heating area 110 is heated, and the problem that heating elements 200 in a plurality of heating areas need to be simultaneously started due to splicing of the heating areas near the center of the platform body 100 is avoided while energy is saved, and the problems of complex control and overlarge heating range caused by starting of the plurality of heating elements 200 are avoided. As shown in fig. 7, when the printing pattern 600 greatly exceeds the central heating region 110, the central heating region 110 and the peripheral heating region 120 are heated at the same time, that is, the entire platen body 100 is heated, which serves to provide a sufficient heating area for the printing pattern 600. In one embodiment, the area of the central heating area 110 occupies one ninth to four ninth of the area of the platform body 100, so that the area of the central heating area 110 can adapt to most of the printing models, the situation that the heating area is too large due to the too large central heating area 110 is avoided, the situation that the central heating area 110 is too small to meet the printing models and the peripheral heating area 120 needs to be heated simultaneously is avoided, and therefore electric energy is avoided being wasted.

In one embodiment, as shown in fig. 8-10, the heating elements 200 are in one-to-one correspondence with the heating areas, and the heating elements 200 cover the heating areas. The platform body 100 includes a bearing surface and a heating surface, the bearing surface is used for connecting the printing model 600, the heating element 200 includes a metal coating covered on the heating surface, and the metal coating is used for electrifying and heating.

The heating region may correspond to a single heating member 200, or may correspond to a plurality of heating members 200. In one embodiment, the heating area corresponds to one heating element 200, and the heating element 200 is a metal coating coiled on the heating surface of the heating area in an S shape, and the metal coating may completely cover the heating area, i.e. extend to the edge of the heating area, or the edge of the metal coating may be a distance, such as 5 mm, from the edge of the heating area. Avoiding machining errors from causing metal plating to overflow the platform body 100, resulting in short-circuit leakage. The metal coating has a resistance, and when a certain voltage is applied across the metal coating, the metal coating will heat up and in turn heat up the heating area to which it is connected. As shown in fig. 8 to 9, the metal plating layers of the central heating region 110 and the peripheral heating region 120 are respectively connected with a positive electrode power supply wire c, and the metal plating layers of the central heating region 110 and the peripheral heating region 120 are simultaneously connected with a negative electrode power supply wire d, so that a parallel circuit for supplying power to the metal plating layers of the central heating region 110 and the peripheral heating region 120 is formed. Insulating coatings are coated between the metal coating and the platform body 100 and on the outer surface of the platform body 100 opposite to the metal coating for preventing the metal coating from short circuit and electric leakage. It will be appreciated that the metal plating does not cover the insulation, and that the insulation is disposed at the metal plating spacing at the juncture of the central heating region 110 and the peripheral heating region 120 at a distance therebetween.

In one embodiment, the molding platform further includes a temperature measuring member 300, the temperature measuring member 300 is connected to the platform body 100, the central heating area 110 corresponds to the temperature measuring member 300, and the temperature measuring member 300 is used for detecting the temperature of the central heating area 110.

Because the frequency of use of the central heating region 110 is higher, under the condition that the heating element 200 uniformly covers the central heating region 110, only the single temperature measuring element 300 can be arranged to measure the temperature of the central heating region 110, for example, the temperature measuring element is arranged at the center of the central heating region 110, so that the feedback temperature information is the temperature information of the whole central heating region 110, the excessive feedback information is avoided to cause the calculation burden of the controller, the structure of the forming platform is simpler, the number of wires on the platform body 100 is less, and the mutual influence between signals is avoided.

In one embodiment, the molding platform further includes a switch, one end of the switch is electrically connected to the at least two heating elements 200, and the other end of the switch is electrically connected to a power source, where the switch is used to control power supply of the heating elements 200.

The change-over switches may be manual mechanical switches, the number of which is consistent with that of the heating elements 200, for example, the change-over switches are respectively arranged on the positive power supply wires c of the central heating area 110 and the peripheral heating area 120, and the change-over switches may be arranged on the base of the three-dimensional forming device by manually controlling whether the central heating area 110 and the peripheral heating area 120 are heated or not by using the change-over switches respectively. In some other embodiments, the heating control of the heating area may be performed by using computer software, the change-over switch may be an electronically controlled switch such as a relay or an electromagnetic switch, and the change-over switches are respectively disposed on the positive power supply wires c of the central heating area 110 and the peripheral heating area 120, so that the coordinates corresponding to the heating areas are stored in the master controller of the three-dimensional molding device. In the printing process, the main controller judges a heating area corresponding to the first layer of the printing model 600 according to the printing track of the first layer of the printing model 600, and the heating area corresponding to the first layer of the printing model 600 is heated by controlling the suction of the change-over switch, so that the automatic control of heating of the forming platform is realized.

In one embodiment, as shown in fig. 8-10, the molding platform further includes at least two temperature measuring members 300, the temperature measuring members 300 are connected to the platform body 100, the heating area corresponds to at least one temperature measuring member 300, and the temperature measuring members 300 are used for detecting the temperature of the heating area.

The temperature measuring member 300 may be a thermistor, and a thermistor may be disposed in the heating area and located at the central position of the heating area, or a plurality of thermistors may be disposed and distributed at different positions of the heating area, such as the central position and the position near the edge of the heating area, respectively. The heating region is taken as a central heating region 110 and an outer peripheral heating region 120, and one thermistor is provided, respectively, as an example. The thermistor of the central heating area 110 is located at the central position of the central heating area 110, namely, the central position of the forming platform, and the thermistor of the outer periphery heating area 120 is arranged at the middle position of the inner ring edge and the outer ring edge of the outer periphery heating area 120. As shown in fig. 9, the thermistors of the central heating region 110 and the peripheral heating region 120 are respectively connected to one positive power supply wire e, and the thermistors of the central heating region 110 and the peripheral heating region 120 are simultaneously connected to one negative power supply wire f. Voltage is applied to the thermistor, the resistance value of the thermistor changes along with the temperature change, and current capable of reflecting the temperature is generated, so that the temperature of a heating area can be obtained. If the temperature of the thermistor changes along with the central heating area 110 when the central heating area 110 is heated, the resistance of the thermistor changes, and the master controller of the three-dimensional forming device obtains the temperature of the central heating area 110 according to the current, and then can control whether the heating element 200 is heated or not according to the temperature change, so that the temperature of the central heating area 110 is within a preset range, such as between 60 degrees and 80 degrees.

In one embodiment, as shown in fig. 10, the platform body 100 is provided with a temperature measuring hole 140, and the temperature measuring member 300 is disposed in the temperature measuring hole 140. The center of the platform body 100 is provided with a temperature measuring hole 140.

The temperature measuring piece 300 is arranged in the temperature measuring hole 140, so that the contact area between the temperature measuring piece 300 and the platform body 100 is larger, the environmental temperature of the temperature measuring piece 300 is closer to the actual temperature of the platform body 100, and the temperature measuring piece 300 can be ensured to detect the temperature of the platform body 100 more effectively. When the platform body 100 includes the central heating area 110 and the peripheral heating area 120, a temperature measuring hole 140 is provided in the center of the platform body 100, so as to detect the temperature of the center of the platform body 100, and ensure the accuracy of the temperature detection of the central heating area 110 or the area where the printing model 600 is located. The metal coating sets up and dodges hole 210 in temperature measurement hole 140 department, and dodges the diameter in hole and be greater than the internal diameter in temperature measurement hole 140 for temperature measurement spare 300 detected value does not receive the influence of metal coating heat, and temperature measurement spare 300 only detects the temperature value of platform body 100, makes the testing result accurate.

In one embodiment, as shown in fig. 11, the molding platform further includes a magnetic attraction member 400 and a mold contact plate 500, the magnetic attraction member 400 is connected to the platform body 100, the magnetic attraction member 400 is used for magnetically attracting the mold contact plate 500, and the mold contact plate 500 is used for connecting the printing mold 600.

The model contact plate 500 is used for directly contacting with the printing model 600, the model contact plate 500 can include a spring steel plate and an adhesion layer which are stacked, the spring steel plate is used for being fixed on the platform body 100 through the magnetic attraction piece 400, the adhesion layer is a PEI film attached to the upper surface of the spring steel plate, the spring steel plate has elastic deformation capability, permanent deformation can not occur, the structural strength of the model contact plate 500 is ensured, and the PEI film is high-temperature resistant and has stronger adhesion to printing materials. The magnetic attraction piece 400 is a magnetic plate, the magnetic plate is attached to the platform body 100, and when the printing device is used, the model contact plate 500 is placed on the platform body 100, the magnetic attraction piece 400 magnetically attracts the model contact plate 500, the platform body 100 heats the model contact plate 500, and then the printing model 600 can be fixed on the model contact plate 500 in a melting mode.

In another aspect, as shown in fig. 12-13, the present utility model also provides a stereolithography apparatus comprising a patterning platform as described in any of the preceding claims, and a base 20, a guiding drive mechanism, and a printhead assembly. The guide driving mechanism is connected with the base 20, the printing head assembly and the forming platform are respectively connected with the guide driving mechanism, and the guide driving mechanism is used for driving the printing head assembly to move relative to the forming platform so as to carry out three-dimensional forming.

As shown in fig. 14 to 17, the guide driving mechanism further includes a Y-axis guide 30, a Z-axis guide 710, and an X-axis guide assembly including an X-axis guide profile 720, two slide bars 730, and a driving assembly, the X-axis guide profile 720 being connected to the Z-axis guide 710, the forming stage may further include a bracket to which the stage body 100 is connected, the bracket being connected to the base 20 through the Y-axis guide 30, and the Z-axis guide 710 being erected above the forming stage and being connected to the base 20. The printhead assembly includes a printhead body 810, a movable frame 820, and a roller 830; the driving assembly is connected with the X-axis guide profile 720 and the movable frame 820, the printhead body 810 and the rollers 830 are respectively disposed at opposite sides of the movable frame 820, and the rollers 830 are connected with the movable frame 820 through connecting bolts 840. The rollers 830 may specifically be three, two of which are disposed above the X-axis guiding profile 720, one of which is disposed below the X-axis guiding profile 720, and the rollers 830 are configured to roll relative to the X-axis guiding profile 720 under the action of the driving assembly, so that the printhead assembly moves along the X-axis guiding profile 720 in the X-axis direction. The both ends of X axle guide section bar 720 set up installing support 740, are provided with pulley 750 on the installing support 740, and X axle guide section bar 720 passes through installing support 740 sliding connection on Z axle guide section bar 711 of Z axle guide 710, and Z axle guide 710 still includes motor 712, and motor 712 is connected with transfer line 713, and threaded connection has driving piece 714 on the transfer line 713, and driving piece 714 is fixed on installing support 740, and motor 712 passes through drive transfer line 713 rotation, and screw thread promotes driving piece 714 and drives X axle guide section bar 720 and remove in the Y axial direction. The forming platform moves along the Y-axis direction under the action of the Y-axis guide 30, so that the printing head assembly moves relative to the forming platform in three dimensions of the X-axis, the Y-axis and the Z-axis, and three-dimensional printing is realized.

In one embodiment, the two sides of the X-axis guiding profile 720 opposite to the roller 830 are respectively provided with a mounting groove, the mounting grooves extend in the X-axis direction, the roller 830 is circumferentially provided with a rolling groove opposite to the mounting grooves, the sliding rod 730 is partially embedded into the mounting grooves and is located between the rolling grooves and the mounting grooves, and the inner wall of the rolling groove is abutted to the outer wall of the sliding rod 730.

The sliding bars 730 may have a cylindrical bar-shaped structure, the number of the sliding bars 730 is two, and the installation grooves are respectively provided at the top and bottom surfaces of the X-axis guide profile 720. The mounting groove and the rolling groove each have an arc-shaped inner wall adapted to the outer wall of the slide bar 730, and the mounting groove and the rolling groove abut the slide bar 730 from the two radial sides of the slide bar 730. The rollers 830 will roll along the sliding bar 730 under the action of the driving assembly, and the sliding bar 730 guides the rollers 830. Because the X-axis guide section 720 is usually an aluminum section with lower rigidity, the roller 830 contacts with the sliding rod 730, so that the roller 830 is prevented from directly contacting with the X-axis guide section 720 to cause abrasion and deformation of the surface of the X-axis guide section 720, and the abrasion and deformation are prevented from affecting the moving precision of the guide rail and the printing head assembly. The slide bar 730 can be made of wear-resistant materials and can be replaced, so that the moving stability of the printing head assembly is guaranteed, and the printing motion noise is reduced.

In one embodiment, the driving assembly includes a power member 910, a driving belt 920 and two synchronizing wheels 930, the power member 910 is connected with the X-axis guiding profile 720, the synchronizing wheels 930 are respectively disposed on the output end of the power member 910 and the X-axis guiding profile 720, the driving belt 920 surrounds the synchronizing wheels 930, and the driving belt 920 is connected with the movable frame 820. The X-axis guiding profile 720 is further provided with a yielding groove 721, and the driving belt 920 is positioned in the yielding groove 721.

The abdication groove 721 is a strip-shaped groove extending in the X-axis direction, the power piece 910 is arranged on the mounting bracket 740 at one end of the X-axis guiding section bar 720, the power piece 910 and the X-axis guiding section bar 720 are positioned at two opposite sides of the mounting bracket 740, one side of the X-axis guiding section bar 720 extends in the output axial direction of the power piece 910, one of the synchronous wheels 930 is arranged on the output shaft, the other is arranged at the other end of the X-axis guiding section bar 720, and the other is positioned in the abdication groove 721. The power member 910 is used to drive a drive belt 920 drive to move the printhead assembly in the X-axis direction. The drive belt 920 is positioned in the relief slot 721, which makes the structure of the drive belt 920 and the X-axis guide profile 720 more compact, makes the volume of the printhead assembly connected with the drive belt 920 and the X-axis guide profile 720 smaller, reduces the driving load, and simultaneously reduces the weight of the X-axis guide profile 720.

In one embodiment, two ends of the X-axis guiding profile 720 are further provided with protective shells 750, the synchronizing wheel 930 is located in the protective shells 750, and the protective shells 750 protect the synchronizing wheel 930.

Referring to fig. 17-19, the printhead body 810 includes a heat dissipation member 811, a throat 812 connected to the heat dissipation member 811, a heating block 813 screwed to the throat 812, and a nozzle 814 screwed to the heating block 813; the outer diameter of the throat 812 near the end of the nozzle 814 is less than the outer diameter of the end of the nozzle 814 near the throat 812; the end of the nozzle 814 adjacent the throat includes an unthreaded section having a length of 0.5mm to 4mm. Wherein, screw holes matched with the throat 812 and the nozzle 814 are arranged on the heating block 813.

The outer diameter of the throat 812 near one end of the nozzle 814 is smaller than the outer diameter of the nozzle 814 near one end of the throat 812, the contact surface area between the nozzle 812 and the throat 814 is increased, when the throat 812 and the nozzle 814 are twisted tightly by using certain larger torque force, the end face of the throat 812 is completely pressed on the end face of the nozzle 814, the end faces of the throat 812 and the nozzle 814 are mutually extruded, and the two end faces are slightly deformed to form a seal, so that leakage is prevented. The length of the threaded section is set to 0.5mm-4mm so that the nozzle 814 can be screwed into the heating block 813 to the bottom.

In one aspect, the present utility model provides a molding platform for a stereoscopic molding apparatus, the molding platform comprising:

the platform body 100, the platform body 100 is an integral structure, including at least two heating areas;

at least two heating elements 200, the heating elements 200 are connected with the platform body 100, the heating area corresponds to at least one heating element 200, and the heating elements 200 are used for heating the heating area.

Wherein the platform body 100 further comprises at least one thermal shield positioned between adjacent heating zones, the thermal shield configured to block heat transfer between adjacent heating zones.

Wherein the heat insulating member comprises a hollow 130 and/or a groove;

the forming platform also comprises a filling piece, the filling piece is embedded into the hollow 130 or the groove, and the filling piece is made of heat insulation materials;

the spacing between the hollows 130 is 1mm-5mm, the width of the hollows 130 is 1mm-5mm, and the length of the hollows 130 is 10mm-50mm;

or the interval between the grooves is 1mm-5mm, the width of the grooves is 1mm-5mm, and the length of the grooves is 10mm-50mm.

Wherein the at least two heating regions include a central heating region 110 and a peripheral heating region 120, the center of the central heating region 110 coincides with the center of the platen body 100, and the peripheral heating region 120 surrounds the central heating region 110 for one week.

Wherein the area of the central heating region 110 occupies one ninth to four ninth of the area of the platen body; the central heating region 110 is a circular region or a square region;

the forming platform further comprises: the temperature measuring piece 300 is connected with the platform body 100, the central heating area 110 corresponds to the temperature measuring piece 300, and the temperature measuring piece 300 is used for detecting the temperature of the central heating area 110;

the heating elements 200 are in one-to-one correspondence with the heating areas, and the heating elements 200 cover the heating areas;

the platform body 100 comprises a bearing surface and a heating surface which are opposite to each other, the bearing surface is used for connecting the printing model 600, the heating element 200 comprises a metal coating covered on the heating surface, and the metal coating is used for electrifying and heating;

an insulating coating is provided between the stage body 100 and the heating member 200.

Wherein, the shaping platform still includes: one end of the change-over switch is respectively and electrically connected with at least two heating pieces 200, the other end of the change-over switch is electrically connected with a power supply, and the change-over switch is used for controlling the power supply of the heating pieces 200;

the change-over switch comprises a mechanical switch and is arranged on the three-dimensional forming equipment;

and/or the change-over switch comprises an electric control switch, and the change-over switch is used for being electrically connected with a main controller of the three-dimensional forming equipment.

Wherein, the shaping platform still includes: at least two temperature measuring pieces 300, temperature measuring pieces 300 are connected with platform body 100, and the heating area corresponds with at least one temperature measuring piece 300, and temperature measuring piece 300 is used for detecting the temperature of heating area.

Wherein, the platform body 100 is provided with a temperature measuring hole 140, and the temperature measuring piece 300 is arranged in the temperature measuring hole 140;

the heating member 200 is provided with an avoidance hole 210, the avoidance hole 210 is arranged corresponding to the temperature measuring hole 140, and the diameter of the avoidance hole 210 is larger than the inner diameter of the temperature measuring hole 140.

Wherein, the shaping platform still includes: the magnetic attraction piece 400 and the model contact plate 500, the magnetic attraction piece 400 is connected with the platform body 100, the magnetic attraction piece 400 is used for magnetically attracting the model contact plate 500, and the model contact plate 500 is used for connecting the printing model 600.

On the other hand, the utility model also provides a three-dimensional forming device which comprises the forming platform of any one of the above steps, and

a base, a guide drive mechanism, and a printhead assembly;

the guide driving mechanism is connected with the base, the printing head assembly and the forming platform are respectively connected with the guide driving mechanism, and the guide driving mechanism is used for driving the printing head assembly to move relative to the forming platform so as to carry out three-dimensional forming.

Wherein the guiding driving mechanism comprises a Z-axis guiding piece 710 and an X-axis guiding component, the X-axis guiding component comprises an X-axis guiding section 720, a sliding rod 730 and a driving component, and the printing head component comprises a printing head body 810, a movable frame 820 and a roller 830;

The X-axis guiding section bar 720 is connected with the Z-axis guiding piece 710, the driving component is connected with the X-axis guiding section bar 720 and the movable frame 820, and the printing head body 810 and the roller 830 are respectively arranged at two opposite sides of the movable frame 820;

the two sides of the X-axis guiding profile 720, which are opposite to the roller 830, are respectively provided with a mounting groove, the mounting grooves extend in the X-axis direction, the roller 830 is circumferentially provided with a rolling groove opposite to the mounting grooves, the sliding rod 730 is partially embedded into the mounting grooves and is positioned between the rolling grooves and the mounting grooves, the inner wall of the rolling groove is abutted to the outer wall of the sliding rod 730, and the roller 830 is used for rolling on the sliding rod 730.

The driving assembly comprises a power member 910, a driving belt 920 and two synchronous wheels 930, wherein the power member 910 is connected with the X-axis guiding profile 720, the synchronous wheels 930 are respectively arranged at the output end of the power member 910 and on the X-axis guiding profile 720, the driving belt 920 surrounds the synchronous wheels 930, and the driving belt 920 is connected with the movable frame 820;

the X-axis guide section 720 is also provided with a yielding groove 721, and the driving belt 920 is positioned in the yielding groove 721;

the printhead body 810 includes a heat radiating member 811, a throat 812 connected to the heat radiating member 811, a heating block 813 screwed to the throat 812, and a nozzle 814 screwed to the heating block 813; the outer diameter of the throat 812 near the end of the nozzle 814 is less than the outer diameter of the end of the nozzle 814 near the throat 812; the end of the nozzle 814 adjacent the throat includes an unthreaded section having a length of 0.5mm to 4mm.

The foregoing is merely illustrative of the present utility model, and the present utility model 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 utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (10)

1. A molding platform for a stereoscopic molding apparatus, the molding platform comprising:

the platform body is of an integrated structure and comprises at least two heating areas;

the heating device comprises a platform body, at least two heating pieces, a heating area and at least one heating piece, wherein the heating pieces are connected with the platform body, the heating area corresponds to the at least one heating piece, and the heating pieces are used for heating the heating area.

2. The molding platform of claim 1, wherein,

the platform body further includes at least one thermal shield positioned between adjacent heating zones, the thermal shield configured to block heat transfer between adjacent heating zones.

3. The molding platform of claim 2, wherein,

The heat insulation piece comprises a hollow and/or a groove;

the forming platform further comprises a filling piece, the filling piece is embedded into the hollow or the groove, and the filling piece is made of a heat insulation material;

the distance between the hollows is 1mm-5mm, the width of the hollows is 1mm-5mm, and the length of the hollows is 10mm-50mm;

or the interval between the grooves is 1mm-5mm, the width of the grooves is 1mm-5mm, and the length of the grooves is 10mm-50mm.

4. The molding platform of claim 1, wherein,

at least two heating areas include a central heating area, the center of which coincides with the center of the platen body, and a peripheral heating area surrounding the central heating area for one revolution.

5. The modeling platform of claim 4, wherein the area of the central heating area is one-ninth to four-ninth of the area of the platform body;

the central heating area is a round area or a square area;

the forming platform further comprises: the temperature measuring piece is connected with the platform body, the central heating area corresponds to the temperature measuring piece, and the temperature measuring piece is used for detecting the temperature of the central heating area;

The heating elements are in one-to-one correspondence with the heating areas, and the heating elements cover the heating areas;

the platform body comprises a bearing surface and a heating surface which are opposite, the bearing surface is used for being connected with a printing model, the heating piece comprises a metal coating covered on the heating surface, and the metal coating is used for being electrified and heated;

an insulating coating is arranged between the platform body and the heating piece.

6. The modeling platform of claim 1, wherein the modeling platform further comprises:

one end of the change-over switch is electrically connected with at least two heating pieces respectively, the other end of the change-over switch is electrically connected with a power supply, and the change-over switch is used for controlling the power supply of the heating pieces;

the change-over switch comprises a mechanical switch, and is arranged on the three-dimensional forming equipment;

and/or the change-over switch comprises an electric control switch, and the change-over switch is used for being electrically connected with a main controller of the three-dimensional forming equipment.

7. The modeling platform of claim 1, wherein the modeling platform further comprises:

the temperature measuring parts are connected with the platform body, the heating area corresponds to at least one temperature measuring part, and the temperature measuring parts are used for detecting the temperature of the heating area;

The platform body is provided with a temperature measuring hole, and the temperature measuring piece is arranged in the temperature measuring hole;

the heating piece is provided with an avoidance hole, the avoidance hole is arranged corresponding to the temperature measuring hole, and the diameter of the avoidance hole is larger than the inner diameter of the temperature measuring hole;

the forming platform further comprises: the magnetic attraction piece is connected with the platform body, the magnetic attraction piece is used for magnetically attracting the model contact plate, and the model contact plate is used for connecting a printing model.

8. A stereolithography apparatus comprising a lithography platform as claimed in any one of claims 1 to 7, and

a base, a guide drive mechanism, and a printhead assembly;

the guide driving mechanism is connected with the base, the printing head assembly and the forming platform are respectively connected with the guide driving mechanism, and the guide driving mechanism is used for driving the printing head assembly to move relative to the forming platform so as to perform three-dimensional forming.

9. The stereolithography apparatus as claimed in claim 8, wherein,

the guide driving mechanism comprises a Z-axis guide piece and an X-axis guide assembly, the X-axis guide assembly comprises an X-axis guide section bar, a sliding rod and a driving assembly, and the printing head assembly comprises a printing head body, a movable frame and rollers;

The X-axis guide profile is connected with the Z-axis guide piece, the driving assembly is connected with the X-axis guide profile and the movable frame, and the printing head body and the roller are respectively arranged on two opposite sides of the movable frame;

the X-axis guide profile is characterized in that mounting grooves are formed in two sides of the roller, which are opposite to each other, of the X-axis guide profile, the mounting grooves extend in the X-axis direction, rolling grooves opposite to the mounting grooves are formed in the periphery of the roller, the sliding rod is embedded into the mounting grooves and located between the rolling grooves, the inner walls of the rolling grooves are abutted to the outer walls of the sliding rod, and the roller is used for rolling on the sliding rod.

10. The stereolithography apparatus as claimed in claim 9, wherein,

the driving assembly comprises a power piece, a transmission belt and two synchronous wheels, the power piece is connected with the X-axis guide profile, the synchronous wheels are respectively arranged at the output end of the power piece and on the X-axis guide profile, the transmission belt surrounds the synchronous wheels, and the transmission belt is connected with the movable frame;

the X-axis guide profile is also provided with a yielding groove, and the transmission belt is positioned in the yielding groove;

The printing head body comprises a heat dissipation piece, a throat pipe connected with the heat dissipation piece, a heating block in threaded connection with the throat pipe, and a nozzle in threaded connection with the heating block; the outer diameter of the throat pipe, which is close to one end of the nozzle, is smaller than the outer diameter of the end of the nozzle, which is close to the throat pipe; the end of the nozzle, which is close to the throat pipe, is provided with an unset threaded section, and the length of the unset threaded section is 0.5mm-4mm.

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