Dynamic double-cooling device for additive manufacturing

Abstract

The invention discloses a dynamic double-cooling device for additive manufacturing, and relates to the technical field of rocket thrust chamber manufacturing, the dynamic double-cooling device comprises a forming cylinder and a base plate, the base plate is slidably connected with the forming cylinder in the vertical direction, and the dynamic double-cooling device further comprises a cooling column fixedly installed with the forming cylinder and slidably connected with the base plate in the vertical direction; a containing groove is formed in the top end of the cooling column; the channel I is arranged in the cooling column and consists of a spiral section and a vertical section which are communicated with each other; the cooling unit is arranged on the outer side of the bottom of the forming cylinder and can input a cooling medium from one end of the first channel and recover the cooling medium from the other end of the first channel; the temporary storage film covers the top of the cooling column, and the bottom end of the temporary storage film is located on the inner side of the cooling column and fixedly connected with a fixing ring; the fixing ring is in elastic sliding connection with the cooling column in the vertical direction; the driving unit can drive the temporary storage film to be stored in the containing groove; the cooling effect of the thrust chamber can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rocket thrust chamber manufacturing, and specifically to a dynamic double cooling device for additive manufacturing. Background Art

[0002] Additive manufacturing has great advantages in aspects such as complex structure forming, integrated design of multiple components, and rapid production of small batch customization.

[0003] At the present stage, rocket thrust chambers are mainly manufactured by additive manufacturing technology; after the rocket thrust chamber is formed, it is still in a high-temperature state; the rocket thrust chamber needs to be cooled down for sizing. In the prior art, inert gas cooling is mainly used. The inert gas is introduced into the forming chamber, and by virtue of the characteristic that the inert gas does not react with the metal powder, the heat exchange between the formed rocket thrust chamber and the vacuum chamber wall is accelerated in a low-vacuum environment.

[0004] One cooling method is to directly introduce the inert gas from the top of the forming chamber. The rocket thrust chamber will be cooled from top to bottom. The top of the rocket thrust chamber is cooled first, and its top shrinks suddenly due to rapid cooling, while the bottom is still in a high-temperature and expanded state, which will induce warping or cracking of the rocket thrust chamber. Another cooling method is to introduce the inert gas into the substrate, and the heat of the rocket thrust chamber is absorbed through the conduction of the substrate; due to the relatively high height of the rocket thrust chamber, the traditional cooling method of setting cooling channels on the substrate has a limited contact area with the rocket thrust chamber, and the cooling efficiency is low. Especially for the part of the upper layer of the rocket thrust chamber wrapped by high-temperature metal powder, the heat transfer speed from the upper layer to the lower layer is slow, and the cooling effect is not good. Summary of the Invention

[0005] The purpose of the present invention is to provide a dynamic double cooling device for additive manufacturing to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A dynamic double cooling device for additive manufacturing, including a forming cylinder and a substrate. The substrate is slidably connected to the forming cylinder in the vertical direction. It further includes: a cooling column, fixedly installed with the forming cylinder and slidably connected to the substrate in the vertical direction; a receiving groove is opened at the top end of the cooling column; a first channel is arranged in the cooling column and consists of a connected spiral section and a vertical section; a cooling unit is arranged on the outer side of the bottom of the forming cylinder and can input a cooling medium from one end of the first channel and recover the cooling medium from the other end of the first channel; a temporary storage film covers the top of the cooling column and the bottom end is located inside the cooling column and fixedly connected with a fixing ring; the fixing ring is elastically slidably connected to the cooling column in the vertical direction; a driving unit can drive the temporary storage film to be received into the receiving groove.

[0007] As a further solution of the present invention, the driving unit includes a cylinder and a support plate. The support plate is fixedly installed on the top bottom surface of the temporary film. The cylinder is installed inside the cooling column and is used to drive the support plate to move in the vertical direction.

[0008] As a further solution of the present invention, a second channel is provided inside the cooling column; the input end of the second channel is communicated with the first channel, and the output end of the second channel is located at the top of the cooling column and is attached to the top surface of the temporary film; the cooling column is slidably connected with a sealing plug in the vertical direction; the sealing plug is located in the first channel, and a third channel is opened on the sealing plug; a driving part is installed inside the cooling column, and the driving part is used to drive the sealing plug to move so that the first channel and the second channel are communicated.

[0009] As a further solution of the present invention, the driving part includes a sliding rod, a push rod, a wedge-shaped clamping block and a pull rope; the sliding rod is fixedly connected with the sealing plug, and the top end of the sliding rod penetrates through the cooling column and extends into the accommodating groove; the push rod is fixedly installed on the temporary film and is located directly above the sliding rod; the wedge-shaped clamping block is elastically slidably connected with the cooling column in the horizontal direction; the wedge-shaped clamping block can limit the sliding rod; one end of the pull rope is fixedly connected with the wedge-shaped clamping block, and the other end is fixedly connected with the push rod.

[0010] As a further solution of the present invention, the fitting part between the top end of the cooling column and the temporary film is set in an inverted "J" shape, and the top end of the second channel is located inside the inverted hook shape.

[0011] As a further solution of the present invention, a fifth channel is opened inside the substrate, and the output end of the fifth channel can be communicated with the input end of the first channel; the forming cylinder is elastically slidably connected with a sliding plate in the vertical direction, and the sliding plate is located directly below the substrate; a fourth channel is opened inside the sliding plate, and the fourth channel is a three-way channel, the input end is connected with the cooling unit, the first output end can be communicated with the input end of the first channel, and the second output end can be communicated with the input end of the fifth channel; a one-way valve is arranged inside the sliding plate; a top rod is fixed on the substrate; when the substrate is attached to the sliding plate, the top rod can drive the one-way valve to open, and the fourth channel is communicated with the fifth channel.

[0012] As a further solution of the present invention, the fifth channel is a spiral channel.

[0013] As a further solution of the present invention, the cooling unit includes a circulation pump, a first pipeline, a second pipeline and a third pipeline; the circulation pump is installed at the bottom of the forming cylinder, the first pipeline is installed at the output end of the circulation pump, and the end far away from the circulation pump is connected with the input end of the fourth channel; one ends of the second pipeline and the third pipeline are both connected with the recovery end of the circulation pump; the end of the second pipeline far away from the circulation pump is connected with the output end of the first channel; the end of the third pipeline far away from the circulation pump passes through the top of the forming cylinder and extends into the cavity of the forming cylinder.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the arrangement of the cooling column and the first channel, the cooling medium, the inert gas, flows upward from the bottom in the spiral section of the first channel. The inert gas preferentially absorbs the heat at the bottom of the rocket thrust chamber, causing the bottom of the rocket thrust chamber to cool and solidify first, forming a "rigid anchor point" that restricts the upper part from shrinking and reduces the overall deformation. Then, when the inert gas flows upward, it will sequentially absorb the heat of each layer of the rocket thrust chamber, achieving the effect of overall temperature reduction of the rocket thrust chamber. At the same time, the internal temperature of the rocket thrust chamber always maintains a temperature gradient with the upper layer temperature being higher than the lower layer temperature, which is consistent with the printing direction (stacked from bottom to top), reducing the interlayer shear stress. Moreover, the spiral section of the first channel increases the contact area between the inert gas and the metal powder on the outer side of the cooling column, greatly improving the heat absorption efficiency, and the formed thrust chamber can be cooled faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 is a schematic cross-sectional view of the structure of the cooling column, the temporary storage film and the driving unit of the present invention; Figure 4 is Figure 3 a partial enlarged view of part A in Figure 5 is Figure 3 a partial enlarged view of part B in Figure 6 is a schematic cross-sectional view of the installation state of the sealing plug and the cooling column of the present invention; Figure 7 is a schematic cross-sectional view of the working state of the temporary storage film and the sealing plug of the present invention; Figure 8 is Figure 7 a partial enlarged view of part C in Figure 9 is a schematic diagram of the structure of the first channel of the present invention; Figure 10 is a schematic diagram of the structure of the fifth channel of the present invention; Figure 11 is a schematic cross-sectional view of the fitting state of the substrate and the sliding plate of the present invention; Figure 12 is a schematic diagram of the working principle of the present invention.

[0016] The reference numerals are as follows: 1 - forming cylinder, 2 - substrate, 3 - recycling cylinder, 4 - powder feeding cylinder, 5 - cooling column, 6 - channel one, 7 - temporary storage film, 8 - fixing ring, 9 - cylinder, 10 - support plate, 11 - channel two, 12 - sealing plug, 13 - channel three, 14 - sliding rod, 15 - push rod, 16 - wedge-shaped clamping block, 17 - pull rope, 18 - sliding plate, 19 - channel four, 20 - one-way valve, 21 - ejector rod, 22 - channel five, 23 - circulation pump, 24 - pipeline one, 25 - pipeline two, 26 - pipeline three, 27 - laser generator, 28 - scanning system, 29 - focusing mirror, 30 - window mirror, 31 - powder spreading squeegee. Detailed implementation manner

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1 - 12 , the present invention provides a technical solution: a dynamic double cooling device for additive manufacturing, including a forming cylinder 1 and a substrate 2. The substrate 2 is slidably connected to the forming cylinder 1 in the vertical direction. It also includes a cooling column 5, a channel one 6, a cooling unit, a temporary storage film 7, a fixing ring 8 and a driving unit; the cooling column 5 is fixedly installed with the forming cylinder 1 and is slidably connected to the substrate 2 in the vertical direction; a receiving groove is opened at the top end of the cooling column 5; the channel one 6 is arranged in the cooling column 5 and is composed of a connected spiral section and a vertical section; the cooling unit is arranged on the outer side of the bottom of the forming cylinder 1 and can input the cooling medium from one end of the channel one 6 and recycle the cooling medium from the other end of the channel one 6; the temporary storage film 7 covers the top of the cooling column 5 and the bottom end is located inside the cooling column 5 and is fixedly connected with a fixing ring 8; the fixing ring 8 is elastically slidably connected to the cooling column 5 in the vertical direction; the driving unit can drive the temporary storage film 7 to be received into the receiving groove.

[0019] Since the shape of the rocket thrust chamber is similar to an hourglass, the cooling column 5 is arranged at the center position of the substrate 2. After the thrust chamber is printed, the axis of the cooling column 5 coincides with the axis of the thrust chamber; as Figure 1 shown, the powder feeding cylinder 4 arranged on the right side of the forming cylinder 1 pushes the metal powder upward to the left side of the powder spreading squeegee 31; then the powder spreading squeegee 31 pushes the metal powder to the left side, so that the metal powder is evenly spread on the top of the substrate 2; the excess powder falls into the recycling cylinder 3 for recycling and reuse; the energy beam is emitted by the laser generator 27, and after passing through the scanning system 28, the focusing mirror 29 and the window mirror 30, it irradiates the powder on the substrate 2. The energy beam scans and melts the powder evenly spread on the substrate 2 according to the planned path; as Figure 12As shown in the figure, x in the figure represents the substrate 2 after downward movement, and y represents the substrate 2 in the working state. Considering that after one lamination is completed, during the process of the substrate 2 moving downward in the v1 direction, the unmelted metal powder above the cooling column 5 will collapse outward in the v2 direction, especially in the middle of the thrust chamber; when forming the narrow area in the middle of the thrust chamber, the collapsed powder is likely to mix into the melted powder, which will affect the structural strength of the thrust chamber; after the metal powder melts, the substrate 2 is moved downward, and at the same time, the driving unit drives the top end of the temporary storage film 7 to move downward, so that the top end of the temporary storage film 7 is sunken downward, and the unmelted metal powder above the cooling column 5 follows the temporary storage film 7 and falls into the receiving groove. Since the unmelted metal powder above the cooling column 5 follows the temporary storage film 7 and falls into the receiving groove at this time; the bottom end of the temporary storage film 7 drives the fixing ring 8 to move upward, and the fixing ring 8 drives the first spring connected to it and used for its reset to be compressed; this avoids the outward collapse of the unmelted powder above the cooling column 5 during the downward movement of the substrate 2, thereby avoiding the doping of the melted powder into the unmelted powder during the curing process and affecting the structural strength of the rocket thrust chamber; after the melted powder is cured and formed, the driving unit drives the top end of the temporary storage film 7 to move upward again to return to the initial position, and the fixing ring 8 drives the bottom end of the temporary storage film 7 to move downward under the elastic force of the first spring to return to the initial position, and the top end of the temporary storage film 7 will be straightened to form a plane, and then the powder spreading scraper 31 performs the powder spreading work again; after layer-by-layer deposition and the completion of the printing of the thrust chamber, the cooling unit inputs the cooling medium inert gas from the input end of the channel 1 6; as Figure 9 As shown, the input end of the channel 1 6 is located at the bottom end of the spiral. The inert gas flows upward from bottom to top in the spiral section. Due to the printing sequence, the temperature of the rocket thrust chamber gradually increases from bottom to top. The temperature at the bottom of the rocket thrust chamber is relatively low, and the temperature at the top is relatively high; the inert gas is introduced from the bottom of the spiral section. Through the heat conduction of the metal powder around the rocket thrust chamber, the inert gas preferentially absorbs the heat at the bottom of the rocket thrust chamber, so that the bottom of the rocket thrust chamber is cooled and solidified first to form a "rigid anchor point", which restricts the upper part from shrinking and reduces the overall deformation; then when the inert gas flows upward, it will sequentially absorb the heat of each layer of the rocket thrust chamber. While achieving the effect of overall cooling of the rocket thrust chamber, the internal temperature of the rocket thrust chamber always maintains a temperature gradient with the upper layer temperature higher than the lower layer temperature, and the temperature gradient is consistent with the bottom-up stacking direction of the printing, reducing the interlayer shear stress; after the inert gas flows to the top of the spiral section, it is output downward from the vertical section, returns to the cooling unit to be cooled, and then proceeds to the next cycle. This process effectively cools the workpiece; and the spiral section of the channel 1 6 increases the contact area between the inert gas and the metal powder outside the cooling column 5, greatly improving the heat absorption efficiency, and the formed thrust chamber can be cooled faster.

[0020] Specifically, as Figure 3As shown, the driving unit includes a cylinder 9 and a support plate 10. The support plate 10 is fixedly installed on the top bottom surface of the temporary storage film 7. The cylinder 9 is installed inside the cooling column 5 and is used to drive the support plate 10 to move in the vertical direction. When the cylinder 9 contracts, it drives the support plate 10 and the top of the temporary storage film 7 to move downward, causing the top of the temporary storage film 7 to sink downward. When the cylinder 9 extends, it drives the support plate 10 to move upward to return the temporary storage film 7 to its initial position.

[0021] Specifically, as Figures 3 - 7 shown, a second channel 11 is provided inside the cooling column 5. The input end of the second channel 11 is communicated with the first channel 6, and the output end of the second channel 11 is located at the top of the cooling column 5 and is attached to the top surface of the temporary storage film 7. A sealing plug 12 is slidably connected to the cooling column 5 in the vertical direction. The sealing plug 12 is located inside the first channel 6, and a third channel 13 is provided on the sealing plug 12. A driving part is installed inside the cooling column 5, and the driving part is used to drive the sealing plug 12 to move so as to communicate the first channel 6 and the second channel 11.

[0022] When the driving unit drives the top end of the temporary storage film 7 to sink downward, the driving part drives the sealing plug 12 to move downward to the Figure 7 position shown. At this time, the third channel 13 is communicated with the top of the spiral section of the first channel 6, and the vertical section of the first channel 6 is blocked by the sealing plug 12. The cooling unit passes the inert gas into the bottom of the spiral section of the first channel 6. At this time, the inert gas rises through the spiral section and then enters the third channel 13, and then enters the second channel 11 from the third channel 13. As Figure 7 and Figure 8 shown, when the inert gas entering the second channel 11 blows out from the top, it blows the powder accumulated at the top of the second channel 11 toward the inside of the temporary storage film 7. At the same time, after the inert gas enters the forming cylinder 1, it will be output from the top of the forming cylinder 1, and the inert gas will take away the heat in the uppermost layer of the melted powder, accelerating the solidification of the melted powder.

[0023] Specifically, as Figures 3 - 7 [[ID=IP19]]shown, the driving part includes a slide rod 14, a push rod 15, a wedge-shaped block 16 and a pull rope 17. The slide rod 14 is fixedly connected to the sealing plug 12, and the top end of the slide rod 14 penetrates through the cooling column 5 and extends into the receiving groove. The push rod 15 is fixedly installed on the temporary storage film 7 and is located directly above the slide rod 14. The wedge-shaped block 16 is elastically slidably connected to the cooling column 5 in the horizontal direction. The wedge-shaped block 16 can limit the slide rod 14. One end of the pull rope 17 is fixedly connected to the wedge-shaped block 16, and the other end is fixedly connected to the push rod 15.

[0024] When the support plate 10 drives the top of the temporary storage film 7 to move downward, the support plate 10 drives the push rod 15 to move downward synchronously. After the push rod 15 moves downward and contacts the slide rod 14, the push rod 15 drives the slide rod 14 to move downward, and the slide rod 14 drives the sealing plug 12 to move downward synchronously. The sealing plug 12 drives the second spring connected to it and used for its reset to stretch; after the slide rod 14 moves downward and contacts the wedge-shaped surface at the top of the wedge-shaped block 16, the wedge-shaped block 16 moves away from the slide rod 14 and compresses the third spring connected to the wedge-shaped block 16; after the slide rod 14 moves to the bottom, the wedge-shaped block 16 moves toward the slide rod 14 under the elastic force of the third spring to limit the slide rod 14; when the air cylinder 9 drives the support plate 10 to move upward back to the initial position, the support plate 10 drives the wedge-shaped block 16 to disengage from the slide rod 14 through the pull rope 17. After losing the limit of the wedge-shaped block 16, the sealing plug 12 will move upward under the elastic force of the second spring; it should be noted that as Figure 6 shown, when the temporary storage film 7 is in the initial position, the pull rope 17 is in a taut state. At this time, the wedge-shaped block 16 is located outside the slide rod 14, and the third spring is in a compressed state. When the support plate 10 moves downward a small distance and the pull rope 17 becomes slack, the wedge-shaped block 16 moves below the slide rod 14. Therefore, when the support plate 10 moves upward to the initial position, the wedge-shaped block 16 disengages from the slide rod 14, and the sealing plug 12 moves upward to the initial position; at this time, the second channel 11 is closed; during the upward movement of the temporary storage film 7, the second channel 11 is in an open state. When the inert gas is blown out, it can blow the powder scattered on the temporary storage film 7 below the top of the second channel 11 to the outside, preventing the powder from entering the second channel 11.

[0025] Specifically, as Figure 4 and Figure 8 shown, the fitting part between the top end of the cooling column 5 and the temporary storage film 7 is set in an inverted "J" shape, and the top end of the second channel 11 is located inside the inverted hook shape.

[0026] Setting the top end of the cooling column 5 in an inverted hook shape can make the temporary storage film 7 fit more closely with the top end of the cooling column 5, and at the same time prevent powder from entering the second channel 11.

[0027] Specifically, as Figure 2 、 Figure 10 and Figure 11As shown in the figure, a channel five 22 is provided inside the substrate 2, and the output end of the channel five 22 can be communicated with the input end of the channel one 6; a slide plate 18 is elastically slidably connected to the forming cylinder 1 in the vertical direction, and the slide plate 18 is located directly below the substrate 2; a channel four 19 is provided inside the slide plate 18, and the channel four 19 is a three-way channel, the input end is connected to the cooling unit, the first output end can be communicated with the input end of the channel one 6, and the second output end can be communicated with the input end of the channel five 22; a one-way valve 20 is provided inside the slide plate 18; a push rod 21 is fixed on the substrate 2; when the substrate 2 is in contact with the slide plate 18, the push rod 21 can drive the one-way valve 20 to open, and the channel four 19 is communicated with the channel five 22.

[0028] After the formation of the thrust chamber is completed, the substrate 2 moves downward to the state as shown in Figure 11 At this time, the output end of the channel five 22 inside the substrate 2 is communicated with the input end of the channel one 6; the push rod 21 inside the substrate 2 drives the one-way valve 20 to move downward, and the input end of the channel five 22 is communicated with the channel four 19; after the inert gas transported by the cooling unit enters the channel four 19, it then enters the channel five 22 and the channel one 6 in sequence, and is output from the bottom end of the channel one 6; when the inert gas flow passes through the channel five 22, it preferentially absorbs the heat at the bottom of the rocket thrust chamber, which can improve the cooling efficiency of the rocket thrust chamber.

[0029] Specifically, as shown in Figure 10 The figure shows that the channel five 22 is a spiral channel; the spiral channel five 22 can increase the contact area between the inert gas and the powder above the substrate 2, and improve the heat absorption efficiency.

[0030] Specifically, as shown in Figure 1 and Figure 2 The figure shows that the cooling unit includes a circulation pump 23, a pipeline one 24, a pipeline two 25 and a pipeline three 26; the circulation pump 23 is installed at the bottom of the forming cylinder 1, the pipeline one 24 is installed at the output end of the circulation pump 23, and the end far from the circulation pump 23 is connected to the input end of the channel four 19; one ends of the pipeline two 25 and the pipeline three 26 are both connected to the recovery end of the circulation pump 23; the end of the pipeline two 25 far from the circulation pump 23 is connected to the output end of the channel one 6; the end of the pipeline three 26 far from the circulation pump 23 passes through the top of the forming cylinder 1 and extends into the cavity of the forming cylinder 1.

[0031] When it is necessary to cool the melted powder in the upper layer, the flow path of the inert gas is: pipeline one 24, channel four 19, spiral section of channel one 6, channel three 13 on the sealing plug 12, channel two 11, pipeline three 26; after the formation of the rocket thrust chamber is completed, when cooling the whole rocket thrust chamber, the flow path of the inert gas is: pipeline one 24, channel four 19, channel five 22, channel one 6, pipeline two 25.

[0032] It should be noted that the elastic sliding connection installation described above refers to a structure in which the rocket thrust chamber can automatically reset after sliding, including the use of the spring structure shown in the figure, but not limited to the spring structure.

[0033] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. [[ID=,5]]

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic double cooling device for additive manufacturing, comprising a forming cylinder (1) and a substrate (2), wherein the substrate (2) is slidably connected to the forming cylinder (1) in the vertical direction, and is characterized in that: Further included are: A cooling column (5), fixedly installed with the forming cylinder (1) and slidably connected to the substrate (2) in the vertical direction; a receiving groove is formed at the top end of the cooling column (5); A first channel (6), arranged inside the cooling column (5) and composed of a connected spiral section and a vertical section; A cooling unit, arranged outside the bottom of the forming cylinder (1), and capable of inputting a cooling medium from one end of the first channel (6) and recovering the cooling medium from the other end of the first channel (6); A temporary storage film (7), covering the top of the cooling column (5) and having its bottom end located inside the cooling column (5) and fixedly connected with a fixing ring (8); the fixing ring (8) is elastically slidably connected to the cooling column (5) in the vertical direction; A driving unit, capable of driving the temporary storage film (7) to be received into the receiving groove.

2. The dynamic dual cooling device for additive manufacturing according to claim 1, wherein: The driving unit includes a cylinder (9) and a support plate (10), the support plate (10) is fixedly installed on the top bottom surface of the temporary storage film (7), and the cylinder (9) is installed inside the cooling column (5) and is used to drive the support plate (10) to move in the vertical direction.

3. The dynamic dual cooling device for additive manufacturing according to claim 1, characterized in that: A second channel (11) is arranged inside the cooling column (5); the input end of the second channel (11) is communicated with the first channel (6), and the output end of the second channel (11) is located at the top of the cooling column (5) and is in contact with the top surface of the temporary storage film (7); the cooling column (5) is slidably connected with a sealing plug (12) in the vertical direction; the sealing plug (12) is located inside the first channel (6), and a third channel (13) is formed on the sealing plug (12); a driving part is installed inside the cooling column (5), and the driving part is used to drive the sealing plug (12) to move so that the first channel (6) and the second channel (11) are communicated.

4. The dynamic dual-cooling device for additive manufacturing according to claim 3, characterized in that: The driving part includes a slide rod (14), a push rod (15), a wedge-shaped block (16) and a pull rope (17); the slide rod (14) is fixedly connected with the sealing plug (12), and the top end of the slide rod (14) penetrates through the cooling column (5) and extends into the receiving groove; the push rod (15) is fixedly installed on the temporary storage film (7) and is located directly above the slide rod (14); the wedge-shaped block (16) is elastically slidably connected to the cooling column (5) in the horizontal direction; the wedge-shaped block (16) can limit the slide rod (14); one end of the pull rope (17) is fixedly connected with the wedge-shaped block (16), and the other end is fixedly connected with the push rod (15).

5. The dynamic double cooling device for additive manufacturing according to claim 3, characterized in that: The fitting part between the top end of the cooling column (5) and the temporary storage film (7) is arranged in an inverted "J" shape, and the top end of the second channel (11) is located inside the inverted hook shape.

6. The dynamic dual-cooling device for additive manufacturing according to claim 5, wherein: A channel five (22) is provided inside the substrate (2), and the output end of the channel five (22) can communicate with the input end of the channel one (6); the forming cylinder (1) is elastically and slidably connected with a slide plate (18) in the vertical direction, and the slide plate (18) is located directly below the substrate (2); a channel four (19) is provided inside the slide plate (18), the channel four (19) is a three-way channel, the input end is connected to the cooling unit, one output end can communicate with the input end of the channel one (6), and the other output end can communicate with the input end of the channel five (22); a one-way valve (20) is provided inside the slide plate (18); a push rod (21) is fixed on the substrate (2); when the substrate (2) is in contact with the slide plate (18), the push rod (21) can drive the one-way valve (20) to open, and the channel four (19) communicates with the channel five (22).

7. The dynamic double cooling device for additive manufacturing according to claim 6, characterized in that: The channel five (22) is a spiral channel.

8. The dynamic double cooling device for additive manufacturing according to claim 6, wherein: The cooling unit includes a circulation pump (23), a pipe one (24), a pipe two (25) and a pipe three (26); the circulation pump (23) is installed at the bottom of the forming cylinder (1), the pipe one (24) is installed at the output end of the circulation pump (23), and the end far from the circulation pump (23) is connected to the input end of the channel four (19); one ends of the pipe two (25) and the pipe three (26) are both connected to the recovery end of the circulation pump (23); the end of the pipe two (25) far from the circulation pump (23) is connected to the output end of the channel one (6); the end of the pipe three (26) far from the circulation pump (23) passes through the top of the forming cylinder (1) and extends into the cavity of the forming cylinder (1).

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