A dynamic dual cooling device for additive manufacturing

Abstract

The present invention discloses a dynamic dual-cooling device for additive manufacturing, which relates to the technical field of rocket thrust chamber manufacturing, including a molding cylinder and a base plate, wherein the base plate is slidably connected to the molding cylinder in the vertical direction, and further includes: a cooling column, which is fixedly installed with the molding cylinder and slidably connected to the base plate in the vertical direction; a receiving groove is provided at the top of the cooling column; a channel one is arranged in the cooling column and consists of a connected spiral section and a vertical section; a cooling unit is arranged on the outside of the bottom of the molding cylinder and can input the cooling medium from one end of the channel one and recover the cooling medium from the other end of the channel one; a temporary film, which covers the top of the cooling column and has the bottom end located on the inside of the cooling column and is fixedly connected to a fixing ring; the fixing ring is elastically slidably connected to the cooling column in the vertical direction; a driving unit, which can drive the temporary film to be stored in the receiving groove; the present invention can greatly improve the cooling effect of the thrust chamber.

Description

Technical Field

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

[0002] Additive manufacturing has huge advantages in complex structure molding, multi-component integrated design, small batch customization and rapid production, etc.

[0003] At present, rocket thrust chambers are mainly produced and manufactured using additive manufacturing technology; the rocket thrust chambers are still in a high-temperature state after molding; the rocket thrust chambers need to be cooled after shaping, and the existing technology mainly uses inert gas cooling, and inert gas is introduced into the molding chamber. By taking advantage of the characteristic that inert gas does not react with 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 introduce inert gas directly from the top of the molding chamber. The rocket thrust chamber will be cooled from top to bottom. The top of the rocket thrust chamber will cool first. The top will suddenly cool and shrink, while the bottom will still be in a high-temperature expansion state, which will induce warping or cracking of the rocket thrust chamber.

[0005] Another cooling method is to pass inert gas into the substrate to absorb the heat of the rocket thrust chamber through conduction of the substrate; due to the high height of the rocket thrust chamber, the traditional cooling method of setting cooling channels on the substrate has limited contact area with the rocket thrust chamber and low cooling efficiency, especially for the upper part of the rocket thrust chamber wrapped by high-temperature metal powder. The heat transfer rate from the upper layer to the lower layer is slow, and the cooling effect is poor. Summary of the Invention

[0006] The object of the present invention is to provide a dynamic dual cooling device for additive manufacturing to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a dynamic dual-cooling device for additive manufacturing, comprising a forming cylinder and a base plate, wherein the base plate is slidably connected to the forming cylinder in the vertical direction, and further comprising: a cooling column, fixedly mounted on the forming cylinder and slidably connected to the base plate in the vertical direction; a receiving groove is provided at the top of the cooling column; channel one is arranged in the cooling column and consists of a connected spiral section and a vertical section; a cooling unit is arranged on the outside of the bottom of the forming cylinder and can input the cooling medium from one end of channel one and recover the cooling medium from the other end of channel one; a temporary film, covering the top of the cooling column and with the bottom end located on the inside of the cooling column and fixedly connected to a fixing ring; the fixing ring is elastically slidably connected to the cooling column in the vertical direction; and a driving unit can drive the temporary film to be stored in the receiving groove.

[0008] 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 and bottom surfaces of the temporary film, and the cylinder is installed inside the cooling column and is used to drive the support plate to move in the vertical direction.

[0009] As a further solution of the present invention, channel two is provided in the cooling column; the input end of channel two is connected with channel one, and the output end of channel two is located at the top of the cooling column and is in contact with 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 channel one, and channel three is provided on the sealing plug; a driving part is installed in the cooling column, and the driving part is used to drive the sealing plug to move so that channel one and channel two are connected.

[0010] As a further solution of the present invention, the driving part includes a sliding rod, a push rod, a wedge-shaped block and a pull rope; the sliding rod is fixedly connected to the sealing plug, and the top end of the sliding rod passes through the cooling column and extends into the accommodating groove; the push rod is fixedly installed on the temporary storage film and is located directly above the sliding rod; the wedge-shaped block is elastically slidably connected to the cooling column in the horizontal direction; the wedge-shaped block can limit the sliding rod; one end of the pull rope is fixedly connected to the wedge-shaped block, and the other end is fixedly connected to the push rod.

[0011] As a further solution of the present invention, the top of the cooling column and the contact portion of the temporary film are configured to be in an inverted "J" shape, and the top of the second channel is located inside the inverted hook shape.

[0012] As a further solution of the present invention, a channel five is provided on the inner side of the substrate, and the output end of the channel five can be connected to the input end of the channel one; the forming cylinder is elastically slidably connected to a slide in the vertical direction, and the slide is located directly below the substrate; a channel four is provided in the slide, and the channel four is a three-way channel, the input end of which is connected to the cooling unit, the output end one can be connected to the input end of the channel one, and the output end two can be connected to the input end of the channel five; a one-way valve is provided in the slide; a push rod is fixed on the substrate; when the substrate and the slide are in contact, the push rod can drive the one-way valve to open, and the channel four is connected to the channel five.

[0013] As a further solution of the present invention, the channel five is a vortex channel.

[0014] As a further solution of the present invention, the cooling unit includes a circulation pump, pipe 1, pipe 2 and pipe 3; the circulation pump is installed at the bottom of the forming cylinder, the pipe 1 is installed at the output end of the circulation pump, and the end away from the circulation pump is connected to the input end of channel 4; one end of each of pipe 2 and pipe 3 is connected to the recovery end of the circulation pump; the end of pipe 2 away from the circulation pump is connected to the output end of channel 1; the end of pipe 3 away from the circulation pump passes through the top of the forming cylinder and extends into the cavity of the forming cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention arranges a cooling column and channel one, and the cooling medium inert gas flows from bottom to top in the spiral section of channel one. 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" to constrain the shrinkage of the upper part and reduce overall deformation; then, when the inert gas flows upward again, it will absorb part of the heat of each layer of the rocket thrust chamber in turn, achieving the effect of cooling the entire rocket thrust chamber. At the same time, the temperature inside the rocket thrust chamber always maintains a gradient in which the upper layer temperature is higher than the lower layer temperature. The temperature gradient is consistent with the printing direction (stacked from bottom to top), reducing the interlayer shear stress; and the spiral section of channel one increases the contact area between the inert gas and the metal powder outside the cooling column, greatly improving the heat absorption efficiency, and the thrust chamber after molding can be cooled faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0019] Figure 3 This is a schematic cross-sectional view of the cooling column, temporary storage film and drive unit structure of the present invention;

[0020] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0021] Figure 5 for Figure 3 A partial enlarged view of point B in the middle;

[0022] Figure 6 This is a cross-sectional schematic diagram of the installation state of the sealing plug and the cooling column of the present invention;

[0023] Figure 7 This is a cross-sectional schematic diagram of the temporary storage membrane and the sealing plug in the present invention in working state;

[0024] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0025] Figure 9 This is a schematic structural diagram of channel 1 of the present invention;

[0026] Figure 10 This is a schematic diagram of the structure of channel five of the present invention;

[0027] Figure 11 It is a cross-sectional schematic diagram of the bonding state of the substrate and the slide plate of the present invention;

[0028] Figure 12 This is a working principle diagram of the present invention.

[0029] The reference numerals are as follows:

[0030] 1-forming cylinder, 2-base plate, 3-recovery cylinder, 4-powder feeding cylinder, 5-cooling column, 6-channel one, 7-temporary film, 8-fixing ring, 9-cylinder, 10-support plate, 11-channel two, 12-sealing plug, 13-channel three, 14-slide rod, 15-push rod, 16-wedge block, 17-pull rope, 18-slide plate, 19-channel four, 20-check valve, 21-elevator, 22-channel five, 23-circulating pump, 24-pipeline one, 25-pipeline two, 26-pipeline three, 27-laser generator, 28-scanning system, 29-focusing mirror, 30-window mirror, 31-powder scraper. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figures 1-12 The present invention provides a technical solution: a dynamic dual cooling device for additive manufacturing, comprising a forming cylinder 1 and a base plate 2, the base plate 2 being slidably connected to the forming cylinder 1 in the vertical direction, and further comprising a cooling column 5, a channel 1 6, a cooling unit, a temporary storage film 7, a fixing ring 8 and a driving unit; the cooling column 5 is fixedly installed on the forming cylinder 1 and is slidably connected to the base plate 2 in the vertical direction; a receiving groove is provided at the top of the cooling column 5; the channel 1 6 is arranged in the cooling column 5 and consists of a connected spiral section and a vertical section; the cooling unit is arranged on the outside of the bottom of the forming cylinder 1, and can input the cooling medium from one end of the channel 1 6 and recover the cooling medium from the other end of the channel 1 6; the temporary storage film 7 covers the top of the cooling column 5 and the bottom end is located on the inner side of the cooling column 5 and is fixedly connected to the 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 stored in the receiving groove.

[0033] Since the shape of the rocket thrust chamber is similar to an hourglass, the cooling column 5 is set at the center 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. Figure 1As 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 scraper 31; then the powder spreading scraper 31 pushes the metal powder to the left side, so that the metal powder is spread flat on the top of the substrate 2; the excess powder falls into the recovery cylinder 3 for recycling; the energy beam is emitted by the laser generator 27, and is irradiated onto the powder of the substrate 2 after passing through the scanning system 28, the focusing mirror 29 and the window mirror 30. The energy beam scans and melts the powder evenly spread on the substrate 2 according to the planned path; as shown Figure 12 As shown in the figure, x represents the substrate 2 after moving down, and y represents the substrate 2 in the working state. Considering that after completing one layering, when the substrate 2 moves downward in the direction of v1, the unmelted metal powder above the cooling column 5 will collapse outward in the direction of v2, especially in the middle of the thrust chamber; when the narrow area in the middle of the thrust chamber is formed, the collapsed powder is easily mixed with the melted powder, which will affect the structural strength of the thrust chamber; after the metal powder is melted, the substrate 2 is moved downward, and at the same time, the driving unit drives the top of the temporary film 7 to move downward, so that the top of the temporary film 7 is concave downward, and the unmelted metal powder above the cooling column 5 follows the temporary film 7 into the receiving groove. Since the unmelted metal powder above the cooling column 5 follows the temporary film 7 into the receiving groove at this time; the bottom end of the temporary film 7 has The dynamic fixing ring 8 moves upward, and the fixing ring 8 drives the first spring connected to it and used for its reset to be compressed; it avoids the unmelted powder above the cooling column 5 collapsing to the outside during the downward movement of the substrate 2, thereby avoiding the molten powder from being mixed with the unmelted powder during the solidification process, affecting the structural strength of the rocket thrust chamber; after the molten powder is solidified and formed, the driving unit drives the top of the temporary storage film 7 to move upward and return to the initial position. 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 and return to the initial position. The top of the temporary storage film 7 will be straightened to form a plane, and then the powder spreading scraper 31 will perform the powder spreading work again; after layer-by-layer deposition and completion of the printing of the thrust chamber, the cooling unit inputs the cooling medium inert gas from the input end of channel 1 6; as shown Figure 9As shown, the input end of channel 1 6 is located at the bottom of the spiral, and the inert gas flows from bottom to top in the spiral section. Due to the order of printing, the temperature of the rocket thrust chamber gradually increases from bottom to top, and the temperature at the bottom of the rocket thrust chamber is lower and the temperature at the top is higher; the inert gas is introduced from the bottom of the spiral section, and 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, forming a "rigid anchor point" to constrain the shrinkage of the upper part and reduce the overall deformation; then when the inert gas flows upward again, it will absorb part of the heat of each layer of the rocket thrust chamber in turn, while achieving the effect of cooling the rocket thrust chamber as a whole, while the temperature inside the rocket thrust chamber always maintains a gradient in which the upper layer temperature is higher than the lower layer temperature, and the temperature gradient is consistent with the printing direction from bottom to top, 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 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 thrust chamber after molding can be cooled faster.

[0034] Specifically, such as Figure 3 As shown, the driving unit includes a cylinder 9 and a support plate 10. The support plate 10 is fixedly installed on the top and bottom surfaces of the temporary film 7. The cylinder 9 is installed on the inner side of 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 film 7 to move downward, causing the top of the temporary film 7 to be concave downward; when the cylinder 9 extends, it drives the support plate 10 to move upward to return the temporary film 7 to its initial position.

[0035] Specifically, such as Figure 3-Figure 7 As shown, a second channel 11 is provided in the cooling column 5; the input end of the second channel 11 is connected to 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 film 7; the cooling column 5 is slidably connected with a sealing plug 12 in the vertical direction; the sealing plug 12 is located in the first channel 6, and a third channel 13 is provided on the sealing plug 12; a driving part is installed in 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 connected.

[0036] When the driving unit drives the top of the temporary film 7 to be concave downward, the driving unit drives the sealing plug 12 to move downward. Figure 7 As shown in the position, channel three 13 is connected to the top of the spiral section of channel one 6, the vertical section of channel one 6 is blocked by the sealing plug 12, and the cooling unit introduces inert gas from the bottom of the spiral section of channel one 6. At this time, the inert gas rises through the spiral section and enters channel three 13, and then enters channel two 11 from channel three 13; Figure 7 and Figure 8As shown, when the inert gas entering the second channel 11 is blown out from the top, the powder accumulated at the top of the second channel 11 is blown toward the inner side 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. The inert gas will take away the heat in the uppermost layer of melted powder and accelerate the solidification of the melted powder.

[0037] Specifically, such as Figure 3-Figure 7 As 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 passes through the cooling column 5 and extends into the accommodating 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.

[0038] When the support plate 10 drives the top of the temporary 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 bar 14, the push rod 15 drives the slide bar 14 to move downward synchronously, and the slide bar 14 drives the sealing plug 12 to move downward synchronously, and the sealing plug 12 drives the second spring connected thereto and used for its reset to stretch; after the slide bar 14 moves downward and contacts the wedge surface at the top of the wedge-shaped clamping block 16, the wedge clamping block 16 moves to the side away from the slide bar 14 and compresses the third spring connected to the wedge clamping block 16; after the slide bar 14 moves to the bottom, the wedge clamping block 16 moves to the side close to the slide bar 14 under the elastic force of the third spring to limit the slide bar 14; when the cylinder 9 drives the support plate 10 to move upward back to its initial position, the support plate 10 drives the wedge clamping block 16 to disengage from the slide bar 14 through the pull rope 17. After losing the limit of the wedge clamping block 16, the sealing plug 12 will move upward under the elastic force of the second spring; it should be noted that Figure 6 As shown, when the temporary storage film 7 is in the initial position, the pull rope 17 is in a stretched state. At this time, the wedge-shaped block 16 is located outside the slide rod 14, the third spring is in a compressed state, and the support plate 10 moves downward a short distance. After the pull rope 17 is relaxed, the wedge-shaped block 16 moves to the bottom of the slide rod 14. Therefore, when the support plate 10 moves upward to the initial position, the wedge-shaped block 16 is disengaged from the slide rod 14, and the sealing plug 12 moves upward to the initial position again; at this time, the channel 2 11 is closed; during the upward movement of the temporary storage film 7, the channel 2 11 is in an open state, and when the inert gas is blown out, the powder scattered on the temporary storage film 7 below the top of the channel 2 11 can be blown out to the outside to prevent the powder from entering the channel 2 11.

[0039] Specifically, such as Figure 4 and Figure 8 As shown, the top of the cooling column 5 and the contact portion of the temporary storage film 7 are arranged in an inverted "J" shape, and the top of the second channel 11 is located inside the inverted hook shape.

[0040] Setting the top of the cooling column 5 to be in a barb shape can make the temporary film 7 fit more closely to the top of the cooling column 5 and prevent powder from entering the second channel 11.

[0041] Specifically, such as Figure 2 、 Figure 10 and Figure 11 As shown, a channel five 22 is provided on the inner side of the substrate 2, and the output end of the channel five 22 can be connected to the input end of the channel one 6; the forming cylinder 1 is elastically slidably connected to the 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 in the slide plate 18, and the channel four 19 is a three-way channel, the input end of which is connected to the cooling unit, the output end one can be connected to the input end of the channel one 6, and the output end two can be connected to the input end of the channel five 22; a one-way valve 20 is provided in 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 connected to the channel five 22.

[0042] After the thrust chamber is formed, the base plate 2 moves downward to the position as shown in FIG. Figure 11 In the state shown, the output end of channel five 22 on the inner side of the substrate 2 is connected to the input end of channel one 6; the push rod 21 on the inner side of the substrate 2 drives the one-way valve 20 to move downward, and the input end of channel five 22 is connected to channel four 19; the inert gas delivered by the cooling unit enters channel four 19, and then enters channel five 22 and channel one 6 in turn, and is then output from the bottom end of channel one 6; when the inert gas flows through 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.

[0043] Specifically, such as Figure 10 As shown, the channel five 22 is a vortex channel; the vortex channel five 22 can increase the contact area between the inert gas and the powder above the substrate 2, thereby improving the heat absorption efficiency.

[0044] Specifically, such as Figure 1 and Figure 2 As shown, the cooling unit includes a circulation pump 23, a pipe 1 24, a pipe 25 and a pipe 3 26; the circulation pump 23 is installed at the bottom of the forming cylinder 1, the pipe 1 24 is installed at the output end of the circulation pump 23, and the end away from the circulation pump 23 is connected to the input end of the channel 4 19; one end of the pipe 2 25 and the pipe 3 26 are both connected to the recovery end of the circulation pump 23; the end of the pipe 2 25 away from the circulation pump 23 is connected to the output end of the channel 1 6; the end of the pipe 3 26 away from the circulation pump 23 passes through the top of the forming cylinder 1 and extends into the cavity of the forming cylinder 1.

[0045] When the upper melted powder needs to be cooled, the flow path of the inert gas is: pipe one 24, channel four 19, channel one 6 spiral section, channel three 13 on the sealing plug 12, channel two 11, and pipe three 26; after the rocket thrust chamber is formed, when the rocket thrust chamber is cooled as a whole, the flow path of the inert gas is: pipe one 24, channel four 19, channel five 22, channel one 6, and pipe two 25.

[0046] 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.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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 terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic dual cooling device for additive manufacturing, comprising a forming cylinder (1) and a base plate (2), wherein the base plate (2) is slidably connected to the forming cylinder (1) in a vertical direction, and is characterized in that: Also includes: A cooling column (5) is fixedly mounted on the forming cylinder (1) and is slidably connected to the base plate (2) in the vertical direction; a receiving groove is provided at the top end of the cooling column (5); Channel 1 (6), disposed in the cooling column (5) and consisting of a connected spiral section and a vertical section; A cooling unit is provided on the outside of the bottom of the forming cylinder (1) and is capable of inputting a cooling medium from one end of the channel (6) and recovering the cooling medium from the other end of the channel (6); A temporary storage film (7) covers the top of the cooling column (5) and has its bottom end located inside the cooling column (5) and fixedly connected to 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 stored in the receiving tank; The cooling column (5) is provided with a second channel (11); the input end of the second channel (11) is connected to 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 film (7); the cooling column (5) is slidably connected to a sealing plug (12) in the vertical direction; the sealing plug (12) is located in the first channel (6), and the sealing plug (12) is provided with a third channel (13); a driving unit is installed in the cooling column (5), and the driving unit is used to drive the sealing plug (12) to move so that the first channel (6) and the second channel (11) are connected; A channel five (22) is provided on the inner side of the substrate (2), and the output end of the channel five (22) can be communicated with the input end of the channel one (6); the forming cylinder (1) is elastically slidably connected to 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 in the slide plate (18), and the channel four (19) is a three-way channel, the input end of which is connected to the cooling unit, the output end one can be communicated with the input end of the channel one (6), and the output end two can be communicated with the input end of the channel five (22); a one-way valve (20) is provided in the slide plate (18); a push rod (21) is fixed on the substrate (2); when the substrate (2) and the slide plate (18) are in contact, 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).

2. The dynamic dual cooling device for additive manufacturing according to claim 1, characterized in that: The driving unit comprises a cylinder (9) and a support plate (10), wherein the support plate (10) is fixedly mounted on the top and bottom surfaces of the temporary film (7), and the cylinder (9) is mounted on the inner side of 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: 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) passes 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).

4. The dynamic dual cooling device for additive manufacturing according to claim 1, characterized in that: The top of the cooling column (5) and the fitting portion of the temporary storage film (7) are arranged in an inverted "J" shape, and the top of the second channel (11) is located inside the inverted hook shape.

5. The dynamic dual cooling device for additive manufacturing according to claim 1, characterized in that: The channel five (22) is a vortex channel.

6. The dynamic dual cooling device for additive manufacturing according to claim 1, characterized in that: The cooling unit comprises a circulation pump (23), a pipe 1 (24), a pipe 2 (25) and a pipe 3 (26); the circulation pump (23) is installed at the bottom of the molding cylinder (1); the pipe 1 (24) is installed at the output end of the circulation pump (23), and the end away from the circulation pump (23) is connected to the input end of the channel 4 (19); one end of the pipe 2 (25) and the pipe 3 (26) are both connected to the recovery end of the circulation pump (23); the end of the pipe 2 (25) away from the circulation pump (23) is connected to the output end of the channel 1 (6); the end of the pipe 3 (26) away from the circulation pump (23) passes through the top of the molding cylinder (1) and extends into the cavity of the molding cylinder (1).

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