A rejection device for additive manufacturing

Abstract

The present invention relates to a rejection device for additive manufacturing, comprising: a printing table part, which is arranged on a 3D printer, and the top of the printing table part is suitable for adhering printing objects; a plurality of split parts, the plurality of split parts are inserted into the printing table part, and the upper surfaces of the plurality of split parts are coplanar with the upper surface of the printing table part; a compressed air flow part, which is arranged in the printing table part and is connected to the plurality of split parts above, and the compressed air flow part is communicated with an air outlet cylinder arranged at the upper end of the printing table part; in the present invention, by using the rotation of the pushing part as the driving force, when the pushing part drives the compressed air flow part to descend and then drives the plurality of split parts to separate from the printing table part, the adhesion points of a plurality of waste consumables are reduced, and the adhesion area is also reduced synchronously, so that the adhesion firmness of the waste consumables becomes weaker, preparing good conditions for the rejection work of the waste consumables.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and more particularly, to a removal device for additive manufacturing. Background Art

[0002] 3D printing technology, also known as additive manufacturing technology, is a technology that constructs objects by layer-by-layer printing based on digital model files and using adhesive materials such as powdered metals or plastics.

[0003] After the printing process is completed, the product adheres to the printing platform. During the process of the product detaching from the printing platform, residual consumables and trial-printing consumables will adhere to the platform. In this case, it is necessary to remove the printing consumables on the platform. However, the consumables to be removed have a large adhesion area and a strong adhesion force, resulting in the problem of inefficient and difficult removal. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the technical problem of the poor removal method of the residue of printing consumables in the prior art, and provide a removal device for additive manufacturing.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a removal device for additive manufacturing, comprising:

[0006] A printing table part, which is arranged on a D printer, and the top of the printing table part is suitable for adhering to a printed object;

[0007] A plurality of split parts, which are inserted into the printing table part, and the upper surfaces of the plurality of split parts are coplanar with the upper surface of the printing table part;

[0008] A compressed air flow part, which is arranged in the printing table part and is connected to the plurality of split parts above, and an air outlet cylinder communicated with the upper end of the printing table part is arranged on the compressed air flow part;

[0009] A pushing part, which is hinged in an operation hole opened in the printing table part, and the pushing part abuts against the compressed air flow part below. Among them

[0010] When the pushing part is pushed upward to rotate the lever, the pushing part can press down the compressed air flow part, so that the compressed air flow part drives the plurality of split parts to disengage from the printing table part and then blow out air synchronously, and the air blows the top surface of the printing table part through the air outlet cylinder.

[0011] Further, the printing table part includes a first disc arranged on the D printer, an arc-shaped plate arranged at the upper end of the first disc, a ring arranged at the upper end of the arc-shaped plate, and a second disc arranged at the top of the ring;

[0012] The operation hole is arranged on the arc-shaped plate;

[0013] The first disc and the second disc are combined to form a storage tank for accommodating the compressed air flow part.

[0014] Further, the pushing part includes a push rod hinged to the operation hole, a connecting rod arranged at one end of the push rod, and a support roller hinged to the connecting rod. When the push rod is pushed upward for lever rotation, the connecting rod can drive the support roller to descend, so that when the support roller presses down on the compressed air flow part, it rotates by self-friction.

[0015] Further, the printing table part further includes a plurality of rows of round holes arranged on the first disc;

[0016] Every two rows of the plurality of round holes are staggeredly parallel;

[0017] The plurality of rows of round holes correspond to the plurality of split parts one by one, where

[0018] When the support roller presses down on the compressed air flow part, the compressed air flow part can drive the plurality of split parts to disengage from the plurality of rows of round holes.

[0019] Further, the printing table part further includes a plurality of cross bars arranged in the plurality of rows of round holes; the upper edges on the outer sides of the plurality of cross bars are all chamfered edges, where

[0020] When the support roller presses down on the compressed air flow part, the compressed air flow part can drive the plurality of split parts to disengage from the plurality of cross bars.

[0021] Further, the split part includes a cylinder inserted into the round hole; the top surface of the cylinder is coplanar with the top surface of the first disc, where

[0022] When the support roller presses down on the compressed air flow part, the compressed air flow part can drive the cylinder to disengage from the round hole.

[0023] Further, the split part further includes a cross groove centrally arranged at the upper end of the cylinder;

[0024] The outer edge and the upper edge of the cross groove are both chamfered edges;

[0025] The cross bar is adapted to be inserted into the cross groove, where

[0026] When the compressed air flow part drives the cylinder to disengage from the round hole, the cross groove can disengage from the cross bar.

[0027] Further, the compressed air flow part includes a circular plate disposed in the storage tank and connected to the cylinder, a corrugated airbag disposed in the storage tank and connected to the circular plate, and a gas chamber communicatively disposed between the second disc and the arc-shaped plate;

[0028] The gas chamber communicates with the air outlet cylinder, where

[0029] When the support roller presses down on the circular plate, the circular plate can compress the corrugated airbag, so that the gas passes through the gas chamber and then is blown through the air outlet cylinder to purge the first disc.

[0030] Further, the compressed air flow part further includes two through holes mirror-symmetrically disposed on the circular plate and two columns inserted through the two through holes;

[0031] The two columns are disposed on the first disc, where

[0032] When the support roller presses down on the circular plate, the two columns can descend along the two through holes.

[0033] Further, the gas chamber includes a first triangular groove disposed at the upper end of the first disc, a spiral groove disposed on the first disc, and a second triangular groove disposed on the arc-shaped plate,

[0034] The first triangular groove communicates with the lower end of the corrugated airbag, one end of the spiral groove communicates with the first triangular groove, and the other end of the spiral groove communicates with the second triangular groove, where

[0035] The first triangular groove, the spiral groove, and the second triangular groove are adapted to helically extrude the gas.

[0036] The beneficial effect of the present invention is that, by using the rotation of the pushing part as the driving force, when the pushing part drives the compressed air flow part to descend and further drives several split parts to separate from the printing table part, the adhesion points of multiple waste consumables are reduced, and the adhesion area is also reduced synchronously, weakening the adhesion firmness of the waste consumables, which prepares good conditions for the removal work of the waste consumables;

[0037] Moreover, during the compression process of the compressed air flow part, exhaust work will be carried out. During the process of the gas being blown through the air outlet cylinder towards the printing table part, the waste consumables with reduced adhesion firmness will be stressed again for good removal work, and its work can be carried out in multiple different ways, which is efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below with reference to the drawings and embodiments.

[0039] Figure 1 is a perspective view of the present invention;

[0040] Figure 2Is a perspective view of a preferred embodiment of the present invention;

[0041] Figure 3 Is of the present invention Figure 2 The enlarged view at position A in;

[0042] Figure 4 Is a schematic diagram of the split cross groove of the cross bar of the present invention;

[0043] Figure 5 Is a side view of the printing table part of the present invention;

[0044] Figure 6 Is a sectional view of the side view of the printing table part of the present invention;

[0045] Figure 7 Is of the present invention Figure 6 The enlarged view at position B in.

[0046] In the figure:

[0047] 1. Printing table part; 11. First disc; 12. Arc plate; 13. Ring; 14. Second disc; 15. Round hole; 16. Cross bar;

[0048] 2. 3D printer;

[0049] 3. Split part; 31. Cylinder; 32. Cross groove;

[0050] 4. Compressed air flow part; 41. Round plate; 42. Corrugated airbag;

[0051] 43. Gas chamber; 431. First triangular groove; 432. Spiral groove; 433. Second triangular groove;

[0052] 44. Through hole; 45. Column;

[0053] 5. Air outlet tube;

[0054] 6. Pushing part; 61. Push rod; 62. Connecting rod; 63. Support roller;

[0055] 7. Operation hole. Detailed implementation manners

[0056] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0057] As Figure 1 shown, Figure 1 Is a perspective view of the present invention; as Figure 2 shown, Figure 2 Is a perspective view of a preferred embodiment of the present invention; as Figure 3 shown, Figure 3It is of the present invention Figure 2 The enlarged view of part A in Figure 4 As shown; Figure 4 It is the schematic diagram of the cross bar split cross groove of the present invention; as Figure 5 shown; Figure 5 It is the side view of the printing table part of the present invention; as Figure 6 shown; Figure 6 It is the sectional view of the side view of the printing table part of the present invention; as Figure 7 shown; Figure 7 It is of the present invention Figure 6 The enlarged view of part B in Figure 1-7 shown. The present invention provides a rejection device for additive manufacturing, including:

[0058] A printing table part 1, the printing table part 1 is arranged on a 3D printer 2, and the top of the printing table part 1 is suitable for adhering printing objects;

[0059] A plurality of split parts 3, the plurality of split parts 3 are inserted into the printing table part 1, and the upper surfaces of the plurality of split parts 3 are coplanar with the upper surface of the printing table part 1;

[0060] A compressed air flow part 4, the compressed air flow part 4 is arranged in the printing table part 1 and is connected to the plurality of split parts 3 above, and an air outlet cylinder 5 communicated with the compressed air flow part 4 is arranged at the upper end of the printing table part 1;

[0061] A pushing part 6, the pushing part 6 is hinged in an operation hole 7 opened on the printing table part 1, and the lower part of the pushing part 6 abuts against the compressed air flow part 4, wherein

[0062] When the pushing part 6 is pushed upward to rotate the lever, the pushing part 6 can press down the compressed air flow part 4, so that the compressed air flow part 4 drives the plurality of split parts 3 to disengage from the printing table part 1 and then blow out air synchronously. The air blows the top surface of the printing table part 1 through the air outlet cylinder 5. Specifically, in the prior art, waste consumables adhered to the printing platform can only be shoveled off manually with tools. Compared with the prior art, the present invention uses the rotation of the pushing part 6 as the driving force. When the pushing part 6 drives the compressed air flow part 4 to descend and then drives the plurality of split parts 3 to disengage from the printing table part 1, the adhesion points of multiple waste consumables are reduced, and its adhesion area is also reduced synchronously, making the adhesion firmness of the waste consumables weaker, which prepares good conditions for the rejection work of the waste consumables; and during the pressing process of the compressed air flow part 4, the exhaust work will be carried out. During the process of the gas blowing through the air outlet cylinder 5 towards the printing table part 1, the waste consumables with reduced adhesion firmness will be stressed again for good rejection work. Its work can be carried out in multiple different ways, which is efficient and convenient.

[0063] Optionally, the printing table part 1 includes a first disc 11 arranged on the 3D printer 2, an arc plate 12 arranged on the upper end of the first disc 11, a ring 13 arranged on the upper end of the arc plate 12, and a second disc 14 arranged on the top end of the ring 13;

[0064] The operation hole 7 is arranged on the arc plate 12;

[0065] The first disc 11 and the second disc 14 are combined to form a storage tank for accommodating the compressed air flow part 4. Specifically, the first disc 11 and the ring 13 are supported and connected by the arc plate 12. The ring 13 provides a support condition for the second disc 14. The storage tank formed between the second disc 14 and the first disc 11 provides a good activity space for many subsequent parts. And the storage tank has a large semi-circular opening, which is convenient for directly observing the state of the compressed air flow part 4. The top surface of the first disc 11 is the adhesion surface of the formed object, and the operation hole 7 provides an activity space for the pushing part 6.

[0066] Optionally, the pushing part 6 includes a push rod 61 hinged to the operation hole 7, a connecting rod 62 arranged at one end of the push rod 61, and a support roller 63 hinged to the connecting rod 62, where

[0067] When the push rod 61 is pushed upward to rotate by leverage, the connecting rod 62 can drive the support roller 63 to descend, so that when the support roller 63 presses down on the compressed air flow part 4, it rotates by self-friction. Specifically, at the initial stage, the end of the push rod 61 facing the compressed air flow part 4 is placed at a high position, and the end away from the compressed air flow part 4 is placed at a low position. When the push rod 61 rotates under the action of the pushing force, the end placed at the high position and the end placed at the low position are swapped. The connecting rod 62 drives the support roller 63 to press down on the compressed air flow part 4, so that the support roller 63 rotates by frictional force during this process, avoiding the influence of the frictional force on the compression process of the compressed air flow part 4.

[0068] Optionally, the printing table part 1 further includes a plurality of rows of round holes 15 arranged on the first disc 11;

[0069] Every two rows of the plurality of round holes 15 are staggered and parallel;

[0070] The plurality of rows of round holes 15 correspond to the plurality of split parts 3 one by one, where

[0071] When the support roller 63 presses down on the compressed air flow part 4, the compressed air flow part 4 can drive several of the split parts 3 away from several rows of the round holes 15. Specifically, the positions of several rows of round holes 15 are set to minimize the gap between them as much as possible. In this case, the partial adhesion area of the waste printed matter between every two round holes 15 horizontally or vertically will also be reduced. When several split parts 3 are separated from several rows of round holes 15, the adhesiveness of the waste printed matter will also be reduced, providing good preconditions for the detachment of the waste printed matter.

[0072] Optionally, the printing table part 1 further includes several cross bars 16 arranged in several rows of the round holes 15;

[0073] The upper edges of the outer sides of several cross bars 16 are all chamfered edges, where

[0074] When the support roller 63 presses down on the compressed air flow part 4, the compressed air flow part 4 can drive several of the split parts 3 away from several of the cross bars 16. Specifically,

[0075] The upper plane of the cross bar 16 is coplanar with the upper plane of the second disc 14. The cross bar 16 can also partially adhere to the waste printed matter. The cross bar 16 can divide the round hole 15 into four equal parts in a fan shape, continuously providing a certain supporting and forming effect for the waste printed matter within the vicinity of the round hole 15, preventing the waste printed matter from collapsing in any state. The chamfered edges of the cross bar 16 expand the printing angle of the waste printed matter, making the forming effect of the waste printed matter good, and also leaving a retention gap for the waste printed matter during the process, facilitating the removal of the waste printed matter by external force.

[0076] Optionally, the split part 3 includes a cylinder 31 inserted into the round hole 15; the top surface of the cylinder 31 is coplanar with the top surface of the first disc 11, where

[0077] When the support roller 63 presses down on the compressed air flow part 4, the compressed air flow part 4 can drive the cylinder 31 away from the round hole 15. Specifically, the outer diameter of the cylinder 31 is equal to the inner diameter of the round hole 15, and they can be completely combined. During the separation process of the cylinder 31 facing the round hole 15, the adhesion force of the waste printed matter can be dispersed locally in a circular shape, making the local separation process of the waste printed matter from the cylinder 31 balanced.

[0078] Optionally, the split part 3 further includes a cross groove 32 centrally arranged at the upper end of the cylinder 31;

[0079] The outer edge and the upper edge of the cross groove 32 are both chamfered edges;

[0080] The cross bar 16 is adapted to be inserted into the cross groove 32, where

[0081] When the compressed air flow portion 4 drives the cylinder 31 to separate from the circular hole 15, the cross groove 32 can separate from the cross rod 16. Specifically, the cross groove 32 divides the upper half of the cylinder 31 into four parts, and the four parts correspond to the four parts of the circular hole 15 equally divided by the cross rod 16, so that the local adhesion part of the waste printed matter adhered to the upper end surface of the cylinder 31 is divided equally again. After the cross groove 32 is combined with the cross rod 16, the adjacent edges therebetween can be combined into a triangular groove, and the notch of the triangular groove is reduced from top to bottom, so that the size of the remaining gap on the bottom surface of the waste printed matter can be guaranteed.

[0082] Optionally, the compressed air flow unit 4 includes a circular plate 41 disposed in the storage tank and connected to the cylinder 31, a corrugated air bag 42 disposed in the storage tank and connected to the circular plate 41, and a gas cavity 43 disposed in communication with the second disc 14 and the arc plate 12;

[0083] The gas cavity 43 is connected to the air outlet tube 5, wherein

[0084] When the support roller 63 presses down the circular plate 41, the circular plate 41 can compress the corrugated airbag 42 so that the gas passes through the gas cavity 43 and then through the air outlet pipe 5 to sweep the first disc 11. Specifically, the corrugated airbag 42 can store gas inside to maintain a certain height and shape to support the circular plate 41, so that the height of the plurality of cylinders 31 can be maintained. The lower half of the corrugated airbag 42 is hopper-shaped, and the size of the upper end of the hopper shape is larger than the size of the lower end. When the circular plate 41 is pressurized to compress the corrugated airbag 42, the gas is compressed and ejected from the gas cavity 43, so that the waste printed matter with reduced adhesion can be effectively removed by wind, and the corrugated airbag 42 can be reset by suction for easy reuse.

[0085] The patent also has the following problems:

[0086] The balance of the circular plate 41 pressing down cannot be guaranteed:

[0087] Optionally, the compressed air flow portion 4 further includes two through holes 44 mirror-imaged on the circular plate 41 and two columns 45 inserted through the two through holes 44;

[0088] The two columns 45 are arranged on the first disk 11, wherein

[0089] When the support roller 63 presses down the circular plate 41, the two columns 45 can descend along the two through holes 44. Specifically, the side walls of the two columns 45 can abut against the walls of the two through holes 44. The two columns 45 limit the descending trajectory of the circular plate 41 through the two through holes 44, so that the circular plate 41 cannot shake back and forth or left and right during the lifting process.

[0090] The patent also has the following problems:

[0091] The gas discharged from the corrugated airbag 42 does not receive a pressurizing effect;

[0092] Optionally, the gas chamber 43 includes a first triangular groove 431 provided at the upper end of the first disc 11, a spiral groove 432 provided on the first disc 11, and a second triangular groove 433 provided on the arc-shaped plate 12.

[0093] The first triangular groove 431 communicates with the lower end of the corrugated airbag 42, one end of the spiral groove 432 communicates with the first triangular groove 431, and the other end of the spiral groove 432 communicates with the second triangular groove 433, where

[0094] The first triangular groove 431, the spiral groove 432, and the second triangular groove 433 are adapted to helically extrude gas. Specifically, the lower surface of the first triangular groove 431 is an inclined surface, and its upper end opening receives the corrugated airbag 42. The first triangular groove 431 can play a guiding role in discharging the gas from the corrugated airbag 42. The gas is discharged from the higher part of the inclined surface of the first triangular groove 431 to the lower part of the inclined surface of the first triangular groove 431. The gas finally enters the spiral groove 432 and enters the second triangular groove 433 through one-time spiral pressurization. The second triangular groove 433 is in the shape of being wider at the top and narrower at the bottom. The gas is subjected to a secondary pressurization effect during the process of passing through the second triangular groove 433. Finally, the pressurized gas is discharged through the air outlet cylinder 5, so that the removal force obtained by the waste printed matter is stronger.

[0095] Working principle: When the product to be printed is removed and waste printed matter is generated on the top surfaces of the second disc 14, the cross bar 16, and the cylinder 31, the push rod 61 is pushed upward. The push rod 61 drives the support roller 63 to press down the circular plate 41 through the connecting rod 62. The circular plate 41 drives the cylinder 31 and the cross groove 32 to descend. The cylinder 31 and the cross groove 32 are respectively disengaged from the circular hole 15 and the cross bar 16, and a part of the adhesion surface of the waste printed matter is reduced. At the same time, the circular plate 41 drives the through hole 44 to descend along the column 45. Then, during this process, the circular plate 41 compresses the corrugated airbag 42 to generate compressed gas. The compressed gas impacts the waste printed matter to be disengaged from the second disc 14 and the cross bar 16 through the guiding of the first triangular groove 431, the spiral groove 432, and the secondary pressurization of the second triangular groove 433. This is the usage process of the removing device for additive manufacturing.

[0096] Based on the above-mentioned ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A rejection device for additive manufacturing, characterized in that, Comprising: A printing table part (1), the printing table part (1) is arranged on a 3D printer (2), and the top of the printing table part (1) is suitable for adhering printing objects; A plurality of split parts (3), the plurality of split parts (3) are inserted on the printing table part (1), and the upper surfaces of the plurality of split parts (3) are coplanar with the upper surface of the printing table part (1); A compressed air flow part (4), the compressed air flow part (4) is arranged in the printing table part (1) and is connected to the plurality of split parts (3) above, and an air outlet cylinder (5) communicated with the upper end of the printing table part (1) is arranged on the compressed air flow part (4); A pushing part (6), the pushing part (6) is hingedly arranged in an operation hole (7) opened on the printing table part (1), and the pushing part (6) abuts against the compressed air flow part (4) below, wherein When the pushing part (6) is pushed upward and rotates in a lever manner, the pushing part (6) can press down the compressed air flow part (4), so that the compressed air flow part (4) drives the plurality of split parts (3) to separate from the printing table part (1) downward and then blow air synchronously, and the air blows the top surface of the printing table part (1) through the air outlet cylinder (5); The printing table part (1) includes a first disc (11) arranged on the 3D printer (2), an arc plate (12) arranged at the upper end of the first disc (11), a ring (13) arranged at the upper end of the arc plate (12), and a second disc (14) arranged at the top end of the ring (13); The operation hole (7) is arranged on the arc plate (12); The first disc (11) and the second disc (14) are combined to form a storage tank for accommodating the compressed air flow part (4); The pushing part (6) includes a push rod (61) hingedly arranged in the operation hole (7), a connecting rod (62) arranged at one end of the push rod (61), and a support roller (63) hingedly arranged on the connecting rod (62), wherein When the push rod (61) is pushed upward and rotates in a lever manner, the connecting rod (62) can drive the support roller (63) to descend, so that the support roller (63) rotates by self-friction when pressing down the compressed air flow part (4).

2. An ejection device for additive manufacturing according to claim 1, characterized in that The printing table part (1) further includes a plurality of rows of round holes (15) arranged on the first disc (11); Every two rows of the plurality of round holes (15) are staggeredly parallel; The plurality of rows of round holes (15) correspond to the plurality of split parts (3) one by one, wherein When the support roller (63) presses down the compressed air flow part (4), the compressed air flow part (4) can drive the plurality of split parts (3) to separate from the plurality of rows of round holes (15).

3. An ejection device for additive manufacturing according to claim 2, characterized in that The printing table part (1) further includes a plurality of cross bars (16) arranged in the plurality of rows of round holes (15); The upper edges on the outer sides of the plurality of cross bars (16) are all chamfered edges, wherein When the support roller (63) presses down the compressed air flow part (4), the compressed air flow part (4) can drive a plurality of the split parts (3) to separate from a plurality of the cross bars (16).

4. An elimination device for additive manufacturing according to claim 3, wherein The split part (3) includes a cylinder (31) inserted into the round hole (15); the top surface of the cylinder (31) is coplanar with the top surface of the first disc (11), where When the support roller (63) presses down the compressed air flow part (4), the compressed air flow part (4) can drive the cylinder (31) to separate from the round hole (15).

5. An elimination device for additive manufacturing according to claim 4, wherein The split part (3) further includes a cross groove (32) centrally arranged at the upper end of the cylinder (31); The outer edge and the upper edge of the cross groove (32) are both chamfered edges; The cross bar (16) is adapted to be inserted into the cross groove (32), where When the compressed air flow part (4) drives the cylinder (31) to separate from the round hole (15), the cross groove (32) can separate from the cross bar (16).

6. An elimination device for additive manufacturing according to claim 5, wherein The compressed air flow part (4) includes a round plate (41) arranged in the storage tank and connected to the upper part of the cylinder (31), a corrugated air bag (42) arranged in the storage tank and connected to the round plate (41), and a gas chamber (43) communicated between the second disc (14) and the arc plate (12); The gas chamber (43) communicates with the air outlet cylinder (5), where When the support roller (63) presses down the round plate (41), the round plate (41) can compress the corrugated air bag (42) so that the gas passes through the gas chamber (43) and then blows the first disc (11) through the air outlet cylinder (5).

7. An elimination device for additive manufacturing according to claim 6, wherein The compressed air flow part (4) further includes two through holes (44) arranged symmetrically on the round plate (41) and two columns (45) inserted into the two through holes (44); The two columns (45) are arranged on the first disc (11), where When the support roller (63) presses down the round plate (41), the two columns (45) can descend along the two through holes (44).

8. An elimination device for additive manufacturing according to claim 7, wherein The gas chamber (43) includes a first triangular groove (431) arranged at the upper end of the first disc (11), a spiral groove (432) arranged on the first disc (11), and a second triangular groove (433) arranged on the arc plate (12), The first triangular groove (431) communicates with the lower end of the corrugated air bag (42), one end of the spiral groove (432) communicates with the first triangular groove (431), and the other end of the spiral groove (432) communicates with the second triangular groove (433), where The first triangular groove (431), the spiral groove (432), and the second triangular groove (433) are adapted to helically extrude gas.

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