A plastic recycling molding die

Abstract

The present invention discloses a recycling plastic forming mold, comprising: a fixed seat, a rotating seat capable of rotation is provided inside the fixed seat, and a plurality of mold base grooves for carrying the mold base are opened on the rotating seat; a circulation processing mechanism, the circulation processing mechanism comprises a shell, a vibration part for vibrating the mold base, a conveyor belt for transmitting the mold base, an ejection mechanism for removing the finished plastic product in the mold base, and a pushing mechanism for pushing the mold base after the plastic product is removed into the mold base groove. The present invention adopts a rotating seat capable of rotation to carry the mold base, and under the action of a shifting mechanism, the mold base carrying the plastic product is transported to the circulation processing mechanism, and then under the action of the circulation processing mechanism, the mold base is pushed back into the rotating seat for circulation processing. During the processing, only a fixed number of mold bases are needed, and basically no manual operation is required, thereby freeing up labor and improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic products, and particularly relates to a recycled plastic forming mold. Background Art

[0002] Recycled plastics can be processed into various products through various forming techniques. For example, polypropylene composite waste can be made into plastic products with stable performance through steps such as crushing, mixing, heating, and molding, and is widely used in fields such as vehicle parts.

[0003] However, there are still some problems in the use of existing forming molds:

[0004] First, existing plastic forming molds are often individual units. During the forming of plastic products, new molds need to be continuously replaced.

[0005] Second, after the plastic product is formed in the mold, a solid ejector rod is often used to eject the plastic product from the bottom of the mold. When the plastic product is just formed, due to its plasticity, directly ejecting the plastic product with the ejector rod easily causes the plastic product to deform, resulting in a decrease in the yield rate. At the same time, when the plastic product is just formed, it is also possible that the plastic product adheres to the side wall of the mold. In this case, directly ejecting the plastic product with the ejector rod may also cause the plastic product to deform, resulting in a decrease in the yield rate. Summary of the Invention

[0006] In view of the above technical deficiencies, the purpose of the present invention is to provide a recycled plastic forming mold, which uses a rotatable rotating seat to carry the mold base, and under the action of the displacement mechanism, transports the mold base carrying the plastic product into the cyclic processing mechanism. Then, under the action of the cyclic processing mechanism, the mold base is pushed back into the rotating seat for cyclic processing. During the processing, only a fixed number of mold bases are required, and basically no manual operation is needed, liberating the labor force and improving work efficiency.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a recycled plastic forming mold, including:

[0008] A fixed seat, inside which there is a rotatable rotating seat, and several mold base slots for carrying the mold base are provided on the rotating seat;

[0009] A cyclic processing mechanism, which includes a housing, on which a vibration part for vibrating the mold base, a conveyor belt for transporting the mold base, an ejecting mechanism for removing the plastic finished product in the mold base, and a pushing mechanism for pushing the mold base after removing the plastic product into the mold base slot are sequentially arranged;

[0010] A displacement mechanism for displacing the mold base in the rotating seat into the vibration part;

[0011] Among them, the vibration part includes a plurality of rollers rotatably arranged on the inner wall of the housing, and multiple rows of protrusion parts arranged side by side are symmetrically arranged on the outer side of the rollers, and the protrusion parts on any two adjacent rollers are not on the same horizontal plane;

[0012] During the transportation of the mold base onto the rollers, under the action of the protrusion parts, the mold base enters a vibrating state.

[0013] Preferably, one end of the roller penetrates through the housing and is connected with a transmission wheel, the outer sides of the plurality of transmission wheels are connected by a transmission belt in a transmission manner, and one transmission wheel located on one side is fixedly connected with the output shaft of the first motor, and the first motor is fixed on the fixed seat by a bracket.

[0014] Preferably, two clamping blocks are integrally formed symmetrically on the outer side of the mold base, and two clamping grooves adapted to the clamping blocks are opened on both sides of the mold base groove.

[0015] Preferably, a mold cavity is opened inside the mold base, a top plate is arranged inside the mold cavity, a first elastic member is fixedly connected to the bottom of the top plate, the first elastic member is fixed inside the mold cavity, and the top plate is in interference fit with the mold cavity.

[0016] Preferably, the ejecting mechanism includes a compressed air cavity, one side of the compressed air cavity is communicated with an air inlet pipe, and a one-way valve is installed on the outer side of the air inlet pipe. The top of the compressed air cavity is communicated with an air delivery pipe for delivering compressed air flow, and a solenoid valve is installed on the outer side of the air delivery pipe. An air pump is installed on one side of the housing, and the air outlet of the air pump is flange-connected to the air inlet pipe.

[0017] Preferably, a plurality of second elastic members are adhered to the upper surface of the compressed air cavity, and a bearing plate is fixedly connected to the tops of the plurality of second elastic members.

[0018] Preferably, the number of the air delivery pipes is five. Among them, one air delivery pipe is located in the middle of the upper surface of the compressed air cavity, and the other four air delivery pipes are annularly arranged outside the air delivery pipe in the middle. Through holes adapted to the positions of the air delivery pipes are opened on the bearing plate.

[0019] Preferably, an air inlet is opened at the bottom of the mold base and is matched with the position of the air delivery pipe.

[0020] Preferably, the pushing mechanism includes a limiting plate. The number of the limiting plates is two, and the two limiting plates are respectively fixed on both sides of the upper surface of the housing. A vertical plate is fixed on the limiting plate, a rotatable rotating rod is installed on the vertical plate, and two push plates are symmetrically and fixedly connected to the outer side of the rotating rod. When the mold base is placed on the pushing mechanism, the rotating rod rotates, and the mold base can be conveyed into the mold base groove through the push plates.

[0021] Preferably, the shifting mechanism includes a support plate which is fixed inside the fixed seat and is located on the side close to the vibration part. A rotatable rotating shaft is installed on the support plate. A strip-shaped pattern part is provided at the bottom of the mold base. A friction part adapted to the strip-shaped pattern part is provided on the outer side of the rotating shaft. A third motor is installed on one side of the support plate. When the third motor rotates, it can drive the rotating shaft to rotate and drive the mold base into the vibration part.

[0022] The beneficial effects of the present invention are as follows:

[0023] The present invention uses a rotatable rotating seat to carry the mold base. Under the action of the shifting mechanism, the mold base carrying plastic products is transported into the cyclic processing mechanism. Then, under the action of the cyclic processing mechanism, the mold base is pushed back into the rotating seat for cyclic processing. During the processing, only a fixed number of mold bases are required, and basically no manual operation is needed, which liberates the labor force and improves the work efficiency.

[0024] The present invention is provided with a roller having a convex part on its surface. After the mold base enters the vibration part, when the mold base is transported on the roller, it can vibrate under the action of the convex part, so as to separate the plastic products from the mold base, avoid the situation that the plastic products adhere to the side wall of the mold, and thus improve the qualified rate.

[0025] The present invention places the mold base carrying plastic products on the ejecting mechanism. Under the action of the self-gravity of the mold base carrying plastic products, the mold base descends. At the same time, under the action of compressed air, the plastic products move upward, which is convenient for taking the plastic products. And the top plate is in surface contact with the plastic products, avoiding the situation that the plastic products are deformed and improving the qualified rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of the present invention.

[0028] Figure 2 It is a schematic structural diagram of the rotating seat of the present invention.

[0029] Figure 3 It is a schematic bottom view structural diagram of the rotating seat of the present invention.

[0030] Figure 4 It is a schematic structural diagram of the cyclic processing mechanism of the present invention.

[0031] Figure 5 This is a schematic structural diagram of the ejection mechanism of the present invention.

[0032] Figure 6 This is a schematic bottom view structural diagram of the bearing plate of the present invention.

[0033] Figure 7 This is a schematic exploded structural diagram of the mold base of the present invention.

[0034] Figure 8 This is a schematic bottom view structural diagram of the mold base of the present invention.

[0035] Figure 9 This is a schematic structural diagram of the first friction part of the present invention.

[0036] Figure 10 This is a schematic structural diagram of the second friction part of the present invention.

[0037] Figure 11 This is a schematic diagram of the movement track of the mold base of the present invention.

[0038] Explanation of reference numerals: 1 - fixed seat; 11 - rotating seat; 111 - mold base groove; 112 - clamping groove; 12 - driving mechanism; 13 - first through groove; 14 - second through groove; 2 - mold base; 21 - mold cavity; 22 - first elastic member; 23 - top plate; 24 - clamping block; 25 - air inlet; 26 - strip-shaped pattern part; 3 - cyclic processing mechanism; 31 - vibration part; 311 - cover plate; 312 - roller; 313 - convex part; 314 - first motor; 315 - transmission wheel; 316 - transmission belt; 32 - conveyor belt; 33 - ejection mechanism; 331 - air pump; 332 - compressed air cavity; 333 - intake pipe; 3331 - check valve; 334 - bearing plate; 3341 - through hole; 335 - second elastic member; 336 - air delivery pipe; 34 - pushing mechanism; 341 - limiting plate; 342 - vertical plate; 343 - second motor; 344 - rotating rod; 345 - push plate; 35 - housing; 4 - shifting mechanism; 41 - support plate; 42 - third motor; 43 - rotating shaft; 44 - first friction part; 45 - second friction part. Detailed implementation manners

[0039] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment: As Figures 1 to 11 shown, the present invention provides a recycled plastic molding die, including:

[0041] Fixing base 1, inside which there is a rotatable rotating base 11. At the bottom of the rotating base 11, there is a driving mechanism 12, which is a reduction motor or a servo motor and is used to drive the rotation of the rotating base 11. A number of mold base grooves 111 for carrying the mold base 2 are provided on the rotating base 11 for storing the mold base 2.

[0042] Circular processing mechanism 3, which includes a housing 35. The housing 35 is an unclosed bulb-shaped structure. A first through groove 13 and a second through groove 14 are provided on the outer side of the fixing base 1. The two ends of the housing 35 are respectively connected to the first through groove 13 and the second through groove 14. In the working state, the mold base 2 in the rotating base 11 leaves the fixing base 1 through the second through groove 14 under the action of the displacement mechanism 4 and enters the vibration part 31. After the demolding work is completed, it enters the mold base groove 111 through the first through groove 13. On the housing 35, there are successively arranged a vibration part 31 for vibrating the mold base 2, a conveyor belt 32 for transporting the mold base 2, an ejection mechanism 33 for removing the plastic product in the mold base 2, and a pushing mechanism 34 for pushing the mold base 2 after removing the plastic product into the mold base groove 111.

[0043] Displacement mechanism 4, which is used to displace the mold base 2 in the rotating base 11 into the vibration part 31.

[0044] Specifically, the displacement mechanism 4 includes a support plate 41. The support plate 41 is fixed on the inner side of the fixing base 1 and is located on the side close to the vibration part 31. A rotatable rotating shaft 43 is installed on the support plate 41. There is a strip-shaped pattern part 26 at the bottom of the mold base 2. The outer side of the rotating shaft 43 has a friction part adapted to the strip-shaped pattern part 26. A third motor 42 is installed on one side of the support plate 41. When the third motor 42 rotates, it can drive the rotation of the rotating shaft 43. The rotating shaft 43 has a friction part, which is used to cooperate with the strip-shaped pattern part 26 at the bottom of the mold base 2. Under the action of friction force, the mold base 2 is transmitted into the vibration part 31.

[0045] More specifically, as Figure 9 shown, the friction part is the first friction part 44. The first friction part 44 is spirally wound around the outer side of the rotating shaft 43 to increase the friction force, and the mold base 2 can be transmitted into the vibration part 31.

[0046] Or, the friction part is the second friction part 45. The second friction part 45 is striped and is adapted to the pattern of the strip-shaped pattern part 26 to increase the friction force, and the mold base 2 can also be transmitted into the vibration part 31.

[0047] The vibrating part 31 includes a plurality of rollers 312 rotatably arranged on the inner wall of the housing 35. On the outer side of the rollers 312, multiple rows of protruding parts 313 arranged side by side are symmetrically provided. And the protruding parts 313 on any two adjacent rollers 312 are not on the same horizontal plane, forming an uneven state. So that during the process of transporting the mold base 2 onto the rollers 312, under the action of the protruding parts 313, the mold base 2 enters a vibrating state, enabling the plastic products in the mold base 2 to vibrate, and the plastic products complete the step of separating from the inner wall of the mold base 2 in the vibrating state.

[0048] Specifically, in order to prevent excessive vibration force, a cover plate 311 is also provided. The cover plate 311 is arranged above the rollers 312. The cover plate 311 has an inverted U-shaped structure and does not affect the normal transmission of the mold base 2.

[0049] More specifically, as Figure 4 shown, one end of the roller 312 penetrates through the housing 35 and is connected with a transmission wheel 315. The outer sides of a plurality of transmission wheels 315 are connected by a transmission belt 316 in a transmission manner. One transmission wheel 315 located on one side is fixedly connected with the output shaft of the first motor 314. The first motor 314 is fixed on the fixed seat 1 by a bracket and is used to drive the roller 312 to rotate so as to transport the mold base 2 onto the conveyor belt 32.

[0050] Then it enters the ejection mechanism 33. Among them, when in the ejection mechanism 33 step, the mold base 2 on the conveyor belt 32 can be taken manually, or the mold base 2 on the conveyor belt 32 can be taken by setting a manipulator. No matter which method is adopted, the work of taking out the plastic products can be completed. When taking out, the ejection mechanism 33 includes a compressed air cavity 332. One side of the compressed air cavity 332 is communicated with an air inlet pipe 333, and a one-way valve 3331 is installed outside the air inlet pipe 333. The top of the compressed air cavity 332 is communicated with an air delivery pipe 336 for delivering compressed air flow, and a solenoid valve is installed outside the air delivery pipe 336. An air pump 331 is installed on one side of the housing 35, and the air outlet of the air pump 331 is flange-connected to the air inlet pipe 333. Among them, the air pump 331 is used to deliver external air into the compressed air cavity 332. At this time, the solenoid valve on the air delivery pipe 336 is closed, and the gas is compressed in the compressed air cavity 332. And in order to facilitate the staff or the manipulator to take out the plastic products, a plurality of second elastic members 335 are adhered to the upper surface of the compressed air cavity 332, and a bearing plate 334 is fixedly connected to the tops of the plurality of second elastic members 335. When taking out, the mold base 2 is placed on the bearing plate 334. Under the action of the gravity of the mold base 2, the bearing plate 334 presses down the second elastic members 335. At the same time, an air inlet 25 matching the position of the air delivery pipe 336 is opened at the bottom of the mold base 2. At the same time, the solenoid valve is opened, and the compressed air inside the compressed air cavity 332 enters the mold cavity 21 of the mold base 2 through the air delivery pipe 336 and the air inlet 25. The gas pushes up the top plate 23 upwards, and the top plate 23 lifts the formed plastic product, that is, the plastic product moves upwards and the mold base 2 moves downwards, so that the plastic product is exposed, facilitating the taking out of the plastic product.

[0051] As a preferred solution of the above technical solution, the number of the air delivery pipes 336 is set to five. Among them, one air delivery pipe 336 is located in the middle of the upper surface of the compressed air cavity 332, and the other four air delivery pipes 336 are annularly arranged outside the middle air delivery pipe 336. Through holes 3341 matching the positions of the air delivery pipes 336 are opened on the bearing plate 334. A mold cavity 21 is arranged inside the mold base 2. A top plate 23 is arranged inside the mold cavity 21. The bottom of the top plate 23 is fixedly connected with a first elastic member 22, and the first elastic member 22 is fixed inside the mold cavity 21. The top plate 23 is in interference fit with the mold cavity 21. With this setting, when the compressed air pushes up the top plate 23, the top plate 23 can be pushed up from multiple directions, and the top plate 23 moves upwards more smoothly. And the top plate 23 is in interference fit with the mold cavity 21 and is connected by using the first elastic member 22 for elastic reset.

[0052] Meanwhile, the pushing mechanism 34 is provided with a limit plate 341. The number of limit plates 341 is two. The two limit plates 341 are respectively fixed on both sides of the upper surface of the housing 35. A vertical plate 342 is fixed on the limit plate 341. A rotatable rotating rod 344 is installed on the vertical plate 342. Two push plates 345 are symmetrically and fixedly connected to the outside of the rotating rod 344. When the mold base 2 is placed on the pushing mechanism 34, the rotating rod 344 rotates, and the mold base 2 can be conveyed into the mold base groove 111 through the push plates 345. After the plastic product is taken out, the staff or the manipulator places the mold base after taking out the plastic product on the pushing mechanism 34. A second motor 343 is installed on one side of the vertical plate 342. After the second motor 343 is started, it drives the rotating rod 344 to rotate. The rotating rod 344 drives the push plates 345 to rotate, and the push plates 345 convey the mold base 2 into the mold base groove 111. At the same time, two clamping blocks 24 are integrally formed symmetrically on the outside of the mold base 2. Two clamping grooves 112 adapted to the clamping blocks 24 are opened on both sides of the mold base groove 111, so as to ensure the connection stability between the mold base 2 and the mold base groove 111. As Figure 11 shown, X1 is the movement trajectory of the mold base 2, and X2 is the rotation trajectory of the push plate 345.

[0053] When the plastic product is continuously formed:

[0054] By pouring the raw material of the plastic product into the mold cavity 21 in the mold base 2, at the same time, the driving mechanism 12 works, driving the rotating seat 11 to rotate on the fixed seat 1. The mold base groove 111 on the rotating seat 11 can be custom-set according to the processing requirements. At the same time, a heat dissipation mechanism is provided inside the rotating seat 11 to dissipate the heat in the mold base 2, so that the plastic product in the mold base 2 can be quickly formed. In the continuous forming work of the plastic product, the mold base 2 near the second through groove 14 will enter the vibration part 31 under the action of the moving mechanism 4. The plastic product entering the vibration part 31 vibrates continuously, so that the plastic product is separated from the mold base 2, and then enters the ejection mechanism 33 under the action of the conveyor belt 32. It is operated by the staff or the manipulator to separate the plastic product from the mold base. Then the mold base 2 is placed in the pushing mechanism 34 and pushed into the mold base groove 111 by the pushing mechanism 34 for continuous forming. The processing efficiency is high, and there is no need to always replace new molds. Only a fixed mold needs to be set according to the forming time of the plastic product. At the same time, if the forming time of the plastic product is slow, a condensation part can be set before the vibration part 31, that is, under the action of the moving mechanism 4, the mold base 2 carrying the plastic product first enters the condensation part, and under the action of the condensation part, the plastic product is cooled to accelerate its cooling process, and then enters the vibration part 31 after cooling.

[0055] Specifically, the condensation part can be composed of a sealed condensation chamber with double-sided channels. When the mold base 2 carrying the plastic product enters the condensation chamber, one side channel is opened. When the mold base 2 carrying the plastic product leaves the condensation chamber, the other side channel is opened, so as to ensure the temperature in the condensation chamber. At the same time, a conveyor belt 32 is also arranged in the condensation chamber to convey the mold base 2 carrying the plastic product, and the plastic product is formed during the conveying process, achieving continuous operation and liberating labor force.

[0056] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A recycled plastic molding mold, characterized in that: include: A fixed seat (1), wherein a rotatable rotating seat (11) is provided inside the fixed seat (1), and a plurality of die seat grooves (111) for supporting a die seat (2) are provided on the rotating seat (11); A circulation processing mechanism (3), the circulation processing mechanism (3) comprising a housing (35), on which a vibration part (31) for vibrating the mold base (2), a conveyor belt (32) for conveying the mold base (2), an ejection mechanism (33) for removing the finished plastic product from the mold base (2), and a pushing mechanism (34) for pushing the mold base (2) after the plastic product is removed into the mold base groove (111) are arranged in sequence; A first through slot (13) and a second through slot (14) are formed on the outer side of the fixing seat (1), and two ends of the housing (35) are respectively connected to the first through slot (13) and the second through slot (14); A shifting mechanism (4) for shifting the mold base (2) in the rotating base (11) to the vibration part (31); The vibration part (31) comprises a plurality of rollers (312) rotatably arranged on the inner wall of the housing (35), and a plurality of rows of raised parts (313) arranged side by side are symmetrically arranged on the outer sides of the rollers (312), and the raised parts (313) on any two adjacent rollers (312) are not located in the same horizontal plane; During the process of transporting the mold base (2) onto the rotating roller (312), the mold base (2) enters a vibrating state under the action of the raised portion (313); The pushing mechanism (34) comprises a limiting plate (341), wherein the limiting plates (341) are two in number, and the two limiting plates (341) are respectively fixed on both sides of the upper surface of the shell (35); a vertical plate (342) is fixed on the limiting plate (341); a rotatable rotating rod (344) is mounted on the vertical plate (342); and two push plates (345) are symmetrically fixedly connected to the outer side of the rotating rod (344); when the mold base (2) is placed on the pushing mechanism (34), the rotating rod (344) rotates, and the mold base (2) can be transported into the mold base groove (111) through the push plates (345); The shifting mechanism (4) comprises a support plate (41), the support plate (41) being fixed on the inner side of the fixing base (1) and being located on a side close to the vibration part (31), a rotatable rotating shaft (43) being mounted on the support plate (41), a striped pattern part (26) being provided at the bottom of the mold base (2), a friction part adapted to the striped pattern part (26) being provided on the outer side of the rotating shaft (43), and a third motor (42) being mounted on one side of the support plate (41), and when the third motor (42) is rotated, it can drive the rotating shaft (43) to rotate, thereby driving the mold base (2) to enter the vibration part (31).

2. A recycled plastic molding die as claimed in claim 1, characterized in that: One end of the rotating roller (312) passes through the housing (35) and is connected to a transmission wheel (315); the outer sides of a plurality of the transmission wheels (315) are transmission-connected via a transmission belt (316); a transmission wheel (315) located on one side is fixedly connected to an output shaft of a first motor (314); and the first motor (314) is fixed to a fixing seat (1) by a bracket.

3. A recycled plastic molding die as claimed in claim 1, characterized in that: Two clamping blocks (24) are symmetrically integrally formed on the outer side of the mold base (2), and two clamping grooves (112) matching the clamping blocks (24) are formed on both sides of the mold base groove (111).

4. A recycled plastic molding die as claimed in claim 1, characterized in that: A mold cavity (21) is provided on the inner side of the mold base (2), a top plate (23) is provided inside the mold cavity (21), a first elastic member (22) is fixedly connected to the bottom of the top plate (23), the first elastic member (22) is fixed in the mold cavity (21), and the top plate (23) and the mold cavity (21) are interference fit.

5. A recycled plastic molding die as claimed in claim 1, characterized in that: The ejection mechanism (33) comprises a compressed air cavity (332), one side of the compressed air cavity (332) is connected to an air inlet pipe (333), and a one-way valve (3331) is installed on the outside of the air inlet pipe (333), the top of the compressed air cavity (332) is connected to an air delivery pipe (336) for delivering compressed air, and a solenoid valve is installed on the outside of the air delivery pipe (336), and an air pump (331) is installed on one side of the housing (35), and an air outlet of the air pump (331) is flange-connected to the air inlet pipe (333).

6. A recycled plastic molding die as claimed in claim 5, characterized in that: A plurality of second elastic members (335) are bonded to the upper surface of the compressed air cavity (332), and a bearing plate (334) is fixedly connected to the tops of the plurality of second elastic members (335).

7. A recycled plastic molding die as claimed in claim 6, characterized in that: The number of the air delivery pipes (336) is five, wherein one air delivery pipe (336) is located in the middle of the upper surface of the compressed air cavity (332), and the other four air delivery pipes (336) are arranged in a ring shape on the outside of the middle air delivery pipe (336), and the support plate (334) is provided with through holes (3341) adapted to the positions of the air delivery pipes (336).

8. A recycled plastic molding die as claimed in claim 7, characterized in that: The bottom of the mold base (2) is provided with an air inlet (25) that matches the position of the air delivery pipe (336).

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