A low-stress additive manufacturing molding platform

Abstract

The present invention relates to the field of additive processing technology, and specifically to a low-stress additive manufacturing molding platform, comprising a platform plate, wherein a multi-layer additive substrate is provided on the top of the platform plate, and a stress relief mechanism is installed on the bottom of the platform plate; the multi-layer additive substrate comprises an inner substrate located at a central position, and a plurality of groups of outer substrates sequentially sleeved on the outer side of the inner substrate, wherein a cavity opening downward is provided inside the inner substrate, and the lower part of the inner substrate is connected to the platform plate; an additive substrate of a suitable size is selected according to the size of the printed part, and when the printed part is small, the printing demand can be met by relying on the inner substrate, and when the printed part is large, the size of the printed part is matched by relying on the outer substrate sleeved on the inner substrate and the outer side, and when the printed part is larger, the number of outer substrates invested is also more, so as to facilitate the adjustment of the printing area of ​​the additive substrate.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a low-stress additive manufacturing molding platform. Background Art

[0002] Low-stress additive manufacturing is a 3D printing technology that manufactures solid parts by gradually adding materials. Most existing additive manufacturing technologies use selective laser sintering technology for printing.

[0003] At present, when the selective laser sintering platform is in use, the size of the use area of ​​the additive substrate cannot be adjusted according to the size of the actual printed part. When the printed part is small, as the part is printed, the additive substrate will move downward, which will drive more metal powder to move downward, thereby affecting the printing efficiency. Therefore, a low-stress additive manufacturing forming platform is proposed to facilitate the adjustment of the printing area of ​​the additive substrate according to the size of the printed part. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a low-stress additive manufacturing molding platform to facilitate adjustment of the printing area of ​​the additive substrate according to the size of the printed part.

[0005] The technical solution adopted by the present invention to solve its technical problems is a low-stress additive manufacturing molding platform, including a platform plate, a multi-layer additive substrate is provided on the top of the platform plate, and a stress relief mechanism is installed on the bottom of the platform plate; the multi-layer additive substrate includes an inner substrate located in the center position, and a plurality of groups of outer substrates are sequentially arranged on the outside of the inner substrate, a cavity opening downward is provided inside the inner substrate, and the lower part of the inner substrate is connected to the platform plate.

[0006] By adopting the above technical solution, when it is necessary to print parts, an additive substrate of a suitable size is selected according to the size of the printed parts. When the printed parts are small, the printing requirements can be met by relying on the inner substrate. When the printed parts are large, the size of the printed parts is matched by relying on the outer substrate sleeved on the inner substrate and the outer side. When the printed parts are larger, the number of outer substrates invested is also more, so as to facilitate the adjustment of the printing area of ​​the additive substrate. When the printed parts are small, the amount of metal powder used can be reduced. At the same time, relying on the role of the platform plate, the use stability of the multi-layer additive substrate can be improved.

[0007] When printing parts, the stress relief mechanism is used to effectively eliminate stress to improve the printing effect.

[0008] Specifically, the stress relief mechanism includes a plurality of groups of amplitude change rods, one end of each of the plurality of groups of amplitude change rods is fixedly connected to the bottom of the platform plate, and the other end of each of the plurality of groups of platform plates is installed with an exciter.

[0009] By adopting the above technical solution, the stress relief effect is ensured by relying on the horn and the exciter.

[0010] Specifically, the inner substrate and the plurality of groups of outer substrates are provided with pin holes on the same side, all the pin holes are on the same axis, and one side of the outer substrate is provided with a telescopic pin, which is slidably connected with the pin hole.

[0011] By adopting the above technical solution, relying on the sliding connection between the telescopic pin and the pin hole, it is convenient to match the number of external substrates put into use according to the size of the printed parts, so as to adjust the number of external substrates used according to actual usage; the smaller the insertion depth of the telescopic pin, the fewer external substrates that cannot be moved downward, the more external substrates are put into use, and the larger the printing area; conversely, the greater the insertion depth of the telescopic pin, the fewer external substrates are put into use, and the smaller the printing area;

[0012] It should be pointed out that the telescopic pin described in the present invention may be an electric telescopic pin.

[0013] Specifically, a vertically arranged movable tube runs through the middle of the platform plate, the movable tube is slidably connected to the platform plate, a sleeve is provided on the inner top of the cavity, a connecting plate is connected to the lower part of the sleeve, a sliding groove is provided on the connecting plate, a sliding pin is slidably connected in the sliding groove, the sliding pin is connected to the upper part of the movable tube, the sleeve is fixedly connected to the lower surface of the inner base plate, the upper end of the movable tube is slidably connected to the inner side of the sleeve, and the lower end of the movable tube is connected to a lifting mechanism for driving the movable tube to move up and down;

[0014] The lifting mechanism comprises a damping rod connected to the platform plate and a lifting rod connected to the lower end of the movable tube.

[0015] By adopting the above technical solution, when the lifting rod moves downward, the movable tube is driven to move downward. After the movable tube moves downward to a certain position, the sliding pin is pressed and contacted with the lower part of the slide groove to prevent the movable tube from being separated from the lower end of the sleeve.

[0016] When one layer of parts is printed, the lifting rod continues to move downward, driving the movable tube to move downward. When the movable tube moves downward, it drives the inner base plate to move downward. When the inner base plate moves downward, it drives the platform plate to move downward synchronously. At the same time, the outer base plate that is put into use can also move downward together, so as to facilitate the printing of the next layer of parts again.

[0017] The damping rod can improve the downward stability of the platform plate, so that the platform plate moves downward smoothly, and ensure that the upper end of the movable tube can move up and down in the sleeve when the movable tube moves up and down.

[0018] Specifically, the lower inner portion of the movable tube is sealed and slidably connected with an air inlet pipe, the lower end of the air inlet pipe is connected to a cooling source, the top end of the movable tube is blocked, the upper end side of the movable tube is provided with a first air outlet hole connected to the inner side of the movable tube, the upper portion of the sleeve is provided with an exhaust hole, and the lower portions of the inner base plate and the outer base plate are both provided with ventilation holes.

[0019] By adopting the above technical solution, when the part is printed, it is necessary to take out the part, and the lifting rod is used to drive the platform plate and the outer substrate to move up, and the outer substrate put into use is driven to move up. During the upward movement of the movable tube, the first air outlet at the upper end of the movable tube corresponds to the exhaust hole above the sleeve, and the gas of the cooling source enters the movable tube through the air inlet pipe. When the gas enters the movable tube, it is discharged through the first air outlet and finally discharged through the exhaust hole, so that the gas enters the cavity of the inner substrate and cools and dissipates the heat of the inner substrate, which is convenient for cooling the printed parts and the accumulated metal powder, and improving the efficiency of taking out the printed parts;

[0020] By relying on the ventilation holes, the gas in the cavity can dissipate heat to several groups of external substrates in use, thereby improving the heat dissipation effect of the internal substrate and the external substrate.

[0021] Specifically, an annular groove is provided on the inner lower portion of the sleeve, and a reflux hole is provided on the upper side of the movable tube, the reflux hole is located below the first air outlet, and a reflux channel connected to the reflux hole is provided in the tube wall of the movable tube, the reflux channel extends downward to the bottom of the platform plate and is connected to the second air outlet, and the second air outlet faces the stress relief mechanism.

[0022] By adopting the above technical solution, when printing parts, after the movable tube moves down to a certain position, the first air outlet of the movable tube corresponds to the annular groove, and the gas enters the annular groove through the first air outlet. The gas enters the reflux hole by virtue of the correspondence between the annular groove and the reflux hole, and is discharged through the second air outlet by virtue of the reflux channel. The stress relief mechanism is cooled by virtue of the gas, thereby improving the use effect of the stress relief mechanism.

[0023] Specifically, the upper end of the air inlet pipe is blocked, a plurality of groups of third air outlet holes are arranged on the upper side of the air inlet pipe at equal intervals, and a waist-shaped groove corresponding to the third air outlet holes is arranged on the inner side of the movable pipe.

[0024] By adopting the above technical solution, when the movable pipe moves downward, the second air outlet on the air inlet pipe corresponds to the waist-shaped groove, so that the gas in the air inlet pipe enters the movable pipe, and the gas is transported to the stress relief mechanism by relying on the first air outlet and the second air outlet on the movable pipe, and the stress relief mechanism is cooled by relying on the gas;

[0025] When printing parts, as the inner substrate gradually moves downward, the power of the exciter and the amplitude transformer gradually increases. At this time, the heat dissipation efficiency of the amplitude transformer and the exciter needs to be adjusted. When the movable tube moves downward a greater distance, the third air outlet has more connections with the waist-shaped groove, and the air intake volume is greater at this time, so that it is convenient to dissipate heat for the exciter and the amplitude transformer according to actual usage, further improve the heat dissipation effect, and ensure the working stability of the stress relief mechanism.

[0026] Specifically, an active cavity is provided in the middle of the platform plate, a valve plate is provided in the active cavity, a plurality of groups of vent holes which pass through the upper and lower parts and gradually increase in size are provided on the valve plate, the valve plate passes through the active tube and is sealingly and slidingly connected to the active tube, one end of the valve plate is connected to a valve stem, one end of the valve stem passes through the platform plate and is slidingly connected to the platform plate, and the vent hole close to the valve stem is the smallest.

[0027] By adopting the above technical solution, when the valve stem moves, the valve plate is driven to move, and the gas flow size of the movable tube is adjusted by relying on the air holes provided on the valve plate; for example, when the valve stem moves longer, the air hole corresponding to the movable tube becomes larger, and the gas flow volume becomes larger; conversely, when the valve stem moves shorter, the air hole corresponding to the movable tube becomes smaller, and the gas flow volume becomes smaller; and, when the valve stem is in the initial state, the inside of the movable tube is shielded by relying on the action of the valve plate, and at this time, the gas cannot enter the upper part of the movable tube.

[0028] Specifically, a linkage plate is connected to the side of the telescopic pin, a card interface is provided at the lower end of the linkage plate, and a plurality of groups of card slots matching the card interface are provided at the upper part of the valve stem.

[0029] By adopting the above technical solution, a suitable number of additive substrates are selected according to the size of the parts to be printed, and the linkage plate is driven to move by the movement of the telescopic pin. When the linkage plate moves, the valve stem is driven to move synchronously by the cooperation between the card interface and the card slot. When the valve stem moves, the valve plate is driven to move, and the flow rate of the gas can be adjusted according to the number of additive substrates put into use.

[0030] It should be pointed out that when the number of additive substrates put into use increases, the telescopic pin with the valve stem moves a greater distance, the valve plate is driven to move by the movement of the valve stem, and the air intake of the movable tube is increased by increasing the vent hole;

[0031] On the contrary, when the number of additive substrates put into use is smaller, the moving distance of the telescopic pin with the valve stem is smaller, the movement of the valve stem drives the valve plate to move, and the air intake of the movable tube is reduced by reducing the vent hole.

[0032] Specifically, it also includes a cabinet, a molding chamber with an opening upward in the cabinet, a multi-layer additive substrate slidably connected in the molding chamber, a telescopic pin is installed on one side of the molding chamber, one end of the telescopic pin passes through the molding chamber and is slidably connected to the molding chamber, and the lifting mechanism is connected to the bottom of the molding chamber.

[0033] By adopting the above technical solution, when all external substrates are put into use, powder is put into the molding chamber to cooperate with the movement of the multi-layer additive substrate to perform printing.

[0034] Beneficial effects of the present invention:

[0035] A low-stress additive manufacturing forming platform described in the present invention selects an additive substrate of appropriate size according to the size of the printed part. When the printed part is small, the printing demand can be met by relying on the inner substrate. When the printed part is large, the size of the printed part is matched by relying on the outer substrate mounted on the inner substrate and the outer side. When the printed part is larger, the number of outer substrates invested is also greater, thereby facilitating the adjustment of the printing area of ​​the additive substrate.

[0036] A low-stress additive manufacturing forming platform described in the present invention, as the inner base plate is gradually moved downward, in order to ensure the stress relief effect, the power of the exciter and the amplitude transformer is gradually increased. At this time, the heat dissipation efficiency of the amplitude transformer and the exciter needs to be adjusted. The more the movable tube moves downward, the more the number of connections between the third air outlet and the waist-shaped groove is. At this time, the air intake is also greater, so that it is convenient to dissipate the heat of the exciter and the amplitude transformer according to actual usage conditions to ensure the heat dissipation effect.

[0037] The low-stress additive manufacturing forming platform described in the present invention, when the parts are printed, relies on the air intake pipe to allow gas to enter the cavity of the inner substrate to cool and dissipate the heat of the inner substrate. At the same time, relying on the function of the ventilation holes, it is convenient for the gas in the cavity to pass through the ventilation holes to dissipate the heat of several groups of outer substrates put into use, so as to cool the printed parts and the accumulated metal powder, and improve the efficiency of removing the printed parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0039] Figure 1 is an axonometric view of the present invention;

[0040] Figure 2 It is a schematic diagram of the connection structure of the platform plate of the present invention when viewed from above;

[0041] Figure 3 It is a schematic diagram of the connection structure between the movable tube and the platform plate of the present invention;

[0042] Figure 4It is a schematic diagram of the internal structure of the cabinet of the present invention;

[0043] Figure 5 It is a schematic diagram of the cross-sectional connection structure of the movable tube of the present invention;

[0044] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure of region A;

[0045] Figure 7 For the present invention Figure 5 Schematic diagram of the enlarged structure of region B;

[0046] Figure 8 It is a schematic diagram of the cross-sectional structure of the platform plate of the present invention;

[0047] Fig. 9 It is a schematic diagram of the sliding connection structure between the inner base plate and the outer base plate of the present invention;

[0048] In the figure: 1. platform plate; 2. inner base plate; 3. outer base plate; 4. cavity; 5. amplitude rod; 6. exciter; 7. pin hole; 8. telescopic pin; 9. movable tube; 10. sleeve; 11. connecting plate; 12. slide groove; 13. sliding pin; 14. damping rod; 15. lifting rod; 16. air inlet pipe; 17. first air outlet; 18. exhaust hole; 19. ventilation hole; 20. annular groove; 21. reflux hole; 22. reflux channel; 23. second air outlet; 24. third air outlet; 25. waist groove; 26. movable cavity; 27. valve plate; 28. vent; 29. ​​valve stem; 30. linkage plate; 31. card interface; 32. card slot; 33. cabinet; 34. molding bin. DETAILED DESCRIPTION

[0049] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0050] In order to adjust the printing area of ​​the additive substrate according to the size of the printed part, as an embodiment of the present invention, Figure 1 , Figure 2 As shown, a low-stress additive manufacturing molding platform described in the present invention includes a platform plate 1, a multi-layer additive substrate is provided on the top of the platform plate 1, and a stress relief mechanism is installed on the bottom of the platform plate 1; the multi-layer additive substrate includes an inner substrate 2 located at the center, and a plurality of groups of outer substrates 3 sequentially arranged on the outside of the inner substrate 2, a cavity 4 with an opening facing downward is provided inside the inner substrate 2, and the lower part of the inner substrate 2 is connected to the platform plate 1.

[0051] When in use, when it is necessary to print parts, an additive substrate of a suitable size is selected according to the size of the printed parts. When the printed parts are small, the inner substrate 2 can meet the printing requirements. When the printed parts are large, the outer substrate 3 set on the inner substrate 2 and the outer side is used to match the size of the printed parts. When the printed parts are larger, the number of outer substrates 3 input is more, so as to facilitate the adjustment of the printing area of ​​the additive substrate. When the printed parts are small, the amount of metal powder used can be reduced. At the same time, the use stability of the multi-layer additive substrate can be improved by relying on the function of the platform plate 1.

[0052] When printing parts, the stress relief mechanism is used to effectively eliminate stress to improve the printing effect.

[0053] In order to ensure the stress relief effect, for example, Figure 2 As shown, the present invention also includes that the stress relief mechanism includes a plurality of groups of amplitude change rods 5, one end of each of the plurality of groups of amplitude change rods 5 is fixedly connected to the bottom of the platform plate 1, and the other end of each of the plurality of groups of platform plates 1 is installed with an exciter 6.

[0054] When in use, the horn 5 and the exciter 6 are used to ensure the stress relief effect.

[0055] In order to adjust the printing area, for example, Figure 1 As shown, the present invention also includes that the inner substrate 2 and several groups of outer substrates 3 are provided with pin holes 7 on the same side, all the pin holes 7 are on the same axis, and one side of the outer substrate 3 is provided with a telescopic pin 8, and the telescopic pin 8 is slidably connected to the pin hole 7.

[0056] When in use, the sliding connection between the telescopic pin 8 and the pin hole 7 makes it easy to match the number of external base plates 3 put into use according to the size of the printed parts, so as to adjust the number of external base plates 3 used according to actual use conditions; the smaller the insertion depth of the telescopic pin 8, the fewer external base plates 3 that cannot be moved downward, the more external base plates 3 are put into use, and the larger the printing area; conversely, the greater the insertion depth of the telescopic pin 8, the fewer the number of external base plates 3 put into use, and the smaller the printing area;

[0057] It should be pointed out that the telescopic pin 8 described in the present invention can be an electric telescopic pin 8.

[0058] In order to improve the movement stability of the movable tube 9 and the platform plate 1, for example, Figure 3 , Figure 4As shown, the present invention also includes that a vertically arranged movable tube 9 runs through the middle of the platform plate 1, the movable tube 9 is slidably connected to the platform plate 1, a sleeve 10 is provided on the top of the inner side of the cavity 4, the lower part of the sleeve 10 is connected to a connecting plate 11, a slide groove 12 is provided on the connecting plate 11, a sliding pin 13 is slidably connected in the slide groove 12, the sliding pin 13 is connected to the upper part of the movable tube 9, the sleeve 10 is fixedly connected to the lower surface of the inner base plate 2, the upper end of the movable tube 9 is slidably connected to the inner side of the sleeve 10, and the lower end of the movable tube 9 is connected to a lifting mechanism for driving the movable tube 9 to move up and down;

[0059] The lifting mechanism includes a damping rod 14 connected to the platform plate 1 and a lifting rod 15 connected to the lower end of the movable tube 9 .

[0060] When in use, when the lifting rod 15 moves downward, it drives the movable tube 9 to move downward. After the movable tube 9 moves downward to a certain position, the sliding pin 13 is pressed and contacted with the lower part of the slide groove 12 to prevent the movable tube 9 from being separated from the lower end of the sleeve.

[0061] When one layer of parts is printed, the lifting rod 15 continues to move downward, driving the movable tube 9 to move downward. When the movable tube 9 moves downward, it drives the inner base plate 2 to move downward. When the inner base plate 2 moves downward, it drives the platform plate 1 to move downward synchronously. At the same time, the outer base plate 3 put into use can also move downward together, so as to facilitate the next layer of parts printing.

[0062] The damping rod 14 can improve the downward stability of the platform plate 1, so that the platform plate 1 moves downward smoothly, and ensure that the upper end of the movable tube 9 can move up and down in the sleeve 10 when the movable tube 9 moves up and down.

[0063] As an embodiment of the present invention, Figure 3 , Figure 4 , Figure 6 As shown, the present invention also includes that the lower inner portion of the movable tube 9 is sealed and slidably connected with an air inlet pipe 16, the lower end of the air inlet pipe 16 is connected to a cooling source, the top end of the movable tube 9 is blocked, the upper end side of the movable tube 9 is provided with a first air outlet hole 17 connected to the inner side of the movable tube 9, the upper portion of the sleeve 10 is provided with an exhaust hole 18, and the lower portions of the inner base plate 2 and the outer base plate 3 are both provided with ventilation holes 19.

[0064] During use, when the printing of the parts is completed, the parts need to be taken out, and the lifting rod 15 is used to drive the platform plate 1 and the outer base plate 3 to move up, and the outer base plate 3 put into use is driven to move up. During the upward movement of the movable tube 9, the first air outlet 17 at the upper end of the movable tube 9 corresponds to the exhaust hole 18 above the sleeve 10, and the gas of the cooling source is passed through the air inlet pipe 16 into the movable tube 9. When the gas enters the movable tube 9, it is discharged through the first air outlet 17 and finally discharged through the exhaust hole 18, so that the gas enters the cavity 4 of the inner base plate 2, and the inner base plate 2 is cooled and dissipated, so as to facilitate cooling of the printed parts and the accumulated metal powder, and improve the efficiency of taking out the printed parts;

[0065] By relying on the function of the ventilation holes 19 , the gas in the cavity 4 can dissipate heat to a plurality of sets of outer substrates 3 put into use, thereby improving the heat dissipation effect of the inner substrate 2 and the outer substrate 3 .

[0066] It should be further pointed out that, in order to prevent the outside of the ventilation hole 19 from being blocked, a groove (such as Figure 1 , 2 As shown), the groove corresponds to the ventilation hole 19.

[0067] In order to cool down the stress relief mechanism, for example, Figure 5 , Figure 6 , Figure 7 As shown, the present invention also includes that an annular groove 20 is provided at the inner lower part of the sleeve 10, a reflux hole 21 is provided on the upper side of the movable tube 9, the reflux hole 21 is located below the first air outlet 17, a reflux channel 22 connected to the reflux hole 21 is provided in the tube wall of the movable tube 9, the reflux channel 22 extends downward to the bottom of the platform plate 1 and is connected to the second air outlet 23, and the second air outlet 23 faces the stress relief mechanism.

[0068] During use, when printing parts, after the movable tube 9 moves down to a certain position, the first air outlet 17 of the movable tube 9 corresponds to the annular groove 20, and the gas enters the annular groove 20 through the first air outlet 17, and relies on the correspondence between the annular groove 20 and the reflux hole 21 to allow the gas to enter the reflux hole 21, and relies on the reflux channel 22 to discharge the gas through the second air outlet 23, and relies on the gas to cool the stress relief mechanism to improve the use effect of the stress relief mechanism.

[0069] In order to facilitate heat dissipation of the exciter 6 and the horn 5 according to actual use conditions, for example, Figure 6 , Figure 7As shown, the present invention also includes that the upper end of the air inlet pipe 16 is blocked, the upper side surface of the air inlet pipe 16 is provided with a plurality of groups of third air outlet holes 24 distributed at equal intervals up and down, and the inner side surface of the movable tube 9 is provided with a waist-shaped groove 25 corresponding to the third air outlet holes 24.

[0070] When the movable tube 9 is in use, the second air outlet 17 on the air inlet tube 16 corresponds to the waist-shaped groove 25, so that the gas in the air inlet tube 16 enters the movable tube 9, and the gas is transported to the stress relief mechanism by means of the first air outlet 17 and the second air outlet 23 on the movable tube 9, and the stress relief mechanism is cooled by the gas;

[0071] When printing parts, as the inner substrate 2 gradually moves downward, the power of the exciter 6 and the amplitude transformer 5 gradually increases. At this time, the heat dissipation efficiency of the amplitude transformer 5 and the exciter 6 needs to be adjusted. When the movable tube 9 moves downward a greater distance, the number of connections between the third air outlet 24 and the waist-shaped groove 25 increases, and the air intake volume increases at this time, thereby facilitating the heat dissipation of the exciter 6 and the amplitude transformer 5 according to actual usage conditions, further improving the heat dissipation effect, and ensuring the stability of the stress relief mechanism.

[0072] In order to adjust the gas flow of the movable tube 9, for example, Figure 8 As shown, the present invention also includes that an active cavity 26 is provided in the middle of the platform plate 1, a valve plate 27 is provided in the active cavity 26, and a plurality of groups of vent holes 28 are provided on the valve plate 27 which are vertically connected and gradually enlarged, the valve plate 27 passes through the active tube 9 and is sealed and slidably connected to the active tube 9, one end of the valve plate 27 is connected to a valve stem 29, one end of the valve stem 29 passes through the platform plate 1 and is slidably connected to the platform plate 1, and the vent hole 28 close to the valve stem 29 is the smallest.

[0073] When in use, when the valve stem 29 moves, it drives the valve plate 27 to move, and the air flow size of the movable tube 9 is adjusted by relying on the air vent 28 provided on the valve plate 27; for example, when the valve stem 29 moves longer, the air vent 28 corresponding to the movable tube 9 is larger, and the gas flow rate is greater; conversely, when the valve stem 29 moves shorter, the air vent 28 corresponding to the movable tube 9 is smaller, and the gas flow rate is smaller; and, when the valve stem 29 is in the initial state, the inside of the movable tube 9 is blocked by relying on the action of the valve plate 27, and the gas cannot enter the upper part of the movable tube 9 at this time.

[0074] In order to adjust the flow rate of the gas according to the number of additive substrates used, for example, Figure 1 , Figure 8As shown, the present invention also includes that a linkage plate 30 is connected to the side of the telescopic pin 8, a card interface 31 is provided at the lower end of the linkage plate 30, and a plurality of card slots 32 matching the card interface 31 are provided at the upper part of the valve stem 29.

[0075] When in use, a suitable number of additive substrates is selected according to the size of the parts to be printed, and the linkage plate 30 is driven to move by the movement of the telescopic pin 8. When the linkage plate 30 moves, the valve stem 29 is driven to move synchronously by the cooperation between the card interface 31 and the card slot 32. When the valve stem 29 moves, the valve plate 27 is driven to move, so that the flow rate of the gas can be adjusted according to the number of additive substrates put into use;

[0076] It should be pointed out that when the number of additive substrates put into use increases, the telescopic pin 8 and the valve stem 29 move a greater distance, the valve plate 27 is driven to move by the movement of the valve stem 29, and the air intake of the movable tube 9 is increased by increasing the vent hole 28;

[0077] On the contrary, when the number of additive substrates put into use is smaller, the moving distance of the telescopic pin 8 with the valve stem 29 is smaller, the movement of the valve stem 29 drives the valve plate 27 to move, and the air intake of the movable tube 9 is reduced by reducing the vent hole 28.

[0078] For example, Figure 4 As shown, the present invention also includes a cabinet 33, a molding chamber 34 with an opening upward in the cabinet 33, a multi-layer additive substrate is slidably connected in the molding chamber 34, a telescopic pin 8 is installed on one side of the molding chamber 34, one end of the telescopic pin 8 passes through the molding chamber 34 and is slidably connected to the molding chamber 34, and the lifting mechanism is connected to the bottom of the molding chamber 34.

[0079] When in use, when all the outer substrates 3 are put into use, powder is put into the molding bin 34 and the printing work is carried out in coordination with the movement of the multi-layer additive substrate.

[0080] When the present invention is used, when it is necessary to print a part, an additive substrate of a suitable size is selected according to the size of the printed part, and the linkage plate 30 is driven to move by the movement of the telescopic pin 8. When the linkage plate 30 moves, the valve stem 29 is driven to move synchronously by the cooperation between the card interface 31 and the card slot 32. When the valve stem 29 moves, the valve plate 27 is driven to move, so that the flow rate of the gas can be adjusted according to the number of additive substrates put into use;

[0081] When printing a part, the movable tube 9 is driven by the lifting rod 15 to move down to a certain position, so that the gas in the air inlet pipe 16 enters the movable tube 9. At this time, the first air outlet 17 of the movable tube 9 corresponds to the annular groove 20, and the gas enters the annular groove 20 through the first air outlet 17. The annular groove 20 corresponds to the reflux hole 21, so that the gas enters the reflux hole 21, and the gas is discharged through the second air outlet 23 by the reflux channel 22 and transported to the stress relief mechanism, so as to cool the stress relief mechanism;

[0082] The lifting rod 15 continues to move downward, driving the movable tube 9 to move downward. When the movable tube 9 moves downward, it drives the inner base plate 2 to move downward. When the inner base plate 2 moves downward, it drives the platform plate 1 to move downward synchronously. At the same time, the outer base plate 3 that is put into use can also move downward together, so as to facilitate the next layer of parts printing work again;

[0083] As the inner base plate 2 gradually moves downward, the power of the exciter 6 and the horn 5 gradually increases. At this time, the heat dissipation efficiency of the horn 5 and the exciter 6 needs to be adjusted. When the movable tube 9 moves downward, the number of connections between the third air outlet 24 and the waist-shaped groove 25 increases, and the air intake volume increases, so that the exciter 6 and the horn 5 can be dissipated according to the actual use situation, and the heat dissipation effect can be further improved.

[0084] When the printing of the parts is completed, the parts need to be taken out. The lifting rod 15 is used to drive the platform plate 1 and the outer substrate 3 to move up, and the outer substrate 3 put into use is driven to move up. During the upward movement of the movable tube 9, the first air outlet 17 at the upper end of the movable tube 9 corresponds to the exhaust hole 18 above the sleeve. The gas of the cooling source enters the movable tube 9 through the air inlet pipe 16. When the gas enters the movable tube 9, it is discharged through the first air outlet 17 and finally discharged through the exhaust hole 18, so that the gas enters the cavity 4 of the inner substrate 2, and the inner substrate 2 is cooled and dissipated, which is convenient for cooling the printed parts and the accumulated metal powder, and improving the efficiency of taking out the printed parts;

[0085] At the same time, relying on the function of the ventilation holes 19, the gas in the cavity 4 can dissipate heat to several groups of outer substrates 3 put into use, thereby improving the heat dissipation effect of the inner substrate 2 and the outer substrate 3.

[0086] It should be pointed out that (such as Fig. 9 As shown in the figure, the inner side of the outer base plate 3 of the present invention is connected with a T-block, and the outer sides of the inner base plate 2 and the outer base plate 3 are provided with T-slots that slide with the T-block, so as to facilitate the sliding connection between the inner base plate 2 and the outer base plate 3.

[0087] The refrigeration source described in the present invention may be a liquid nitrogen tank.

[0088] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low stress additive manufacturing platform, characterized in that: The invention comprises a platform plate (1), wherein a multi-layer additive substrate is provided on the top of the platform plate (1), and a stress relief mechanism is installed on the bottom of the platform plate (1); the multi-layer additive substrate comprises an inner substrate (2) located at a central position, and a plurality of groups of outer substrates (3) sequentially sleeved on the outer side of the inner substrate (2); a cavity (4) opening downward is provided inside the inner substrate (2), and the lower part of the inner substrate (2) is connected to the platform plate (1); The inner base plate (2) and the plurality of groups of outer base plates (3) are provided with pin holes (7) on the same side, and all the pin holes (7) are on the same axis. A telescopic pin (8) is provided on one side of the outer base plate (3), and the telescopic pin (8) is slidably connected to the pin hole (7); A vertically arranged movable tube (9) runs through the middle of the platform plate (1), and the movable tube (9) is slidably connected to the platform plate (1). A sleeve (10) is provided at the top of the inner side of the cavity (4), and the lower part of the sleeve (10) is connected to a connecting plate (11). A sliding groove (12) is provided on the connecting plate (11), and a sliding pin (13) is slidably connected in the sliding groove (12). The sliding pin (13) is connected to the upper part of the movable tube (9), and the sleeve (10) is fixedly connected to the lower surface of the inner base plate (2). The upper end of the movable tube (9) is slidably connected to the inner side of the sleeve (10), and the lower end of the movable tube (9) is connected to a lifting mechanism for driving the movable tube (9) to move up and down; The lifting mechanism comprises a damping rod (14) connected to the platform plate (1) and a lifting rod (15) connected to the lower end of the movable tube (9); An air inlet pipe (16) is sealingly and slidably connected to the lower inner side of the movable tube (9); the lower end of the air inlet pipe (16) is connected to a cooling source; the top end of the movable tube (9) is blocked; a first air outlet hole (17) communicating with the inner side of the movable tube (9) is provided on the side of the upper end of the movable tube (9); an exhaust hole (18) is provided on the upper part of the sleeve (10); and ventilation holes (19) are provided at the lower parts of the inner base plate (2) and the outer base plate (3).

2. A low stress additive manufacturing forming platform according to claim 1, characterized in that: The stress relief mechanism comprises a plurality of groups of amplitude change rods (5), one end of each of the plurality of groups of amplitude change rods (5) is fixedly connected to the bottom of the platform plate (1), and the other end of each of the plurality of groups of platform plates (1) is equipped with an exciter (6).

3. A low stress additive manufacturing forming platform according to claim 1, characterized in that: An annular groove (20) is provided at the lower inner part of the sleeve (10), a reflux hole (21) is provided at the upper side of the movable tube (9), the reflux hole (21) is located below the first air outlet (17), a reflux channel (22) connected to the reflux hole (21) is provided in the tube wall of the movable tube (9), the reflux channel (22) extends downward to below the platform plate (1) and is connected to the second air outlet (23), and the second air outlet (23) faces the stress relief mechanism; When printing a part, after the movable tube (9) moves downward to a certain position, the first air outlet (17) of the movable tube (9) corresponds to the annular groove (20), and the gas enters the annular groove (20) through the first air outlet (17). The annular groove (20) corresponds to the reflux hole (21), so that the gas enters the reflux hole (21), and the reflux channel (22) discharges the gas through the second air outlet (23).

4. A low stress additive manufacturing forming platform according to claim 3, characterized in that: The upper end of the air inlet pipe (16) is blocked, and the upper side surface of the air inlet pipe (16) is provided with a plurality of groups of third air outlet holes (24) distributed at equal intervals up and down, and the inner side surface of the movable pipe (9) is provided with waist-shaped grooves (25) corresponding to the third air outlet holes (24).

5. According to a low-stress additive manufacturing forming platform as described in claim 4, an active cavity (26) is provided in the middle of the platform plate (1), a valve plate (27) is provided in the active cavity (26), and the valve plate (27) is provided with a plurality of groups of vent holes (28) that pass through the upper and lower parts and gradually increase in size, the valve plate (27) passes through the active tube (9) and is sealed and slidably connected to the active tube (9), one end of the valve plate (27) is connected to a valve stem (29), one end of the valve stem (29) passes through the platform plate (1) and is slidably connected to the platform plate (1), and the vent hole (28) close to the valve stem (29) is the smallest.

6. According to the low-stress additive manufacturing forming platform described in claim 5, the telescopic pin (8) is connected to a linkage plate (30) on the side, the lower end of the linkage plate (30) is provided with a card interface (31), and the upper part of the valve stem (29) is provided with a plurality of groups of card grooves (32) matching the card interface (31).

7. A low-stress additive manufacturing forming platform according to claim 6, further comprising a cabinet (33), a forming bin (34) with an opening facing upward in the cabinet (33), a multi-layer additive substrate being slidably connected in the forming bin (34), a telescopic pin (8) being installed on one side of the forming bin (34), one end of the telescopic pin (8) passing through the forming bin (34) and being slidably connected to the forming bin (34), and the lifting mechanism being connected to the bottom of the forming bin (34).

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