One-piece suction nozzle for standing pouch and secondary shaping tool of one-piece suction nozzle

Abstract

The conjoined suction nozzle comprises a base, a pipe body, a cover body, a connecting part and an inverted-cone-shaped connecting ring which are integrally formed in an injection mode, the upper end face of the inverted-cone-shaped connecting ring is connected with the bottom end face of the cover body, and the lower end face of the inverted-cone-shaped connecting ring is connected with the top end face of the pipe body. The wall thickness of the conical connecting ring is smaller than the wall thickness of the pipe body and the wall thickness of the cover body, the pipe body is in a conical barrel shape with the narrow upper portion and the wide lower portion, and the inner diameter of the cover body is larger than the outer diameter of the 1 / 5 position of the upper portion of the pipe body. The invention further provides a secondary shaping tool for producing the suction nozzle, the secondary shaping tool comprises a working table, an upper die, a lower die, forming mechanisms and a lifting mechanism, the top of the upper die and the bottom of the lower die are each provided with one forming mechanism, the lifting mechanism is arranged at the bottom of the working table and is in transmission connection with the upper die, secondary shaping is conducted through the shaping tool, and the secondary shaping tool is arranged on the working table. The final forming of the suction nozzle can be completed, the mold opening and injection molding times are reduced, the cost is reduced, and meanwhile the production efficiency of the suction nozzle is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of nozzle manufacturing technology, and in particular to an integrated nozzle for stand-up pouches and its secondary shaping tooling. Background Technology

[0002] Stand-up pouches are a common packaging format for bagged beverages (such as bagged milk, soft drinks, and sippy jelly), and the spout is the main drinking tool on these pouches. In traditional spout structures, the cap and the spout body are independent and usually connected by threads, requiring the cap to be unscrewed for use. However, this structure has certain drawbacks:

[0003] First, the cap and the mouthpiece are usually connected by a connecting strap. When the cap is unscrewed, the connecting strap is broken, and the cap and the mouthpiece are two completely independent entities. It is easy to lose the cap during subsequent use. The mouthpiece is usually made of food-grade PE, PP, PET and other non-biodegradable plastics. If it is carelessly discarded, it will cause environmental pollution risks. On the other hand, the cap is easy for children to swallow after it is unscrewed, so there is also a certain safety hazard.

[0004] Second, in the production process of this split structure, the cap, nozzle body, connecting strip and other components need to be injection molded separately and then connected together. Among them, the cap and nozzle body need to be assembled using a capping machine (or pressing machine), while the connecting strip needs to be welded to the cap and nozzle body using an ultrasonic welding machine. Therefore, the entire production process is relatively complicated.

[0005] To address the issue of the cap being easily lost or accidentally swallowed, existing technologies have proposed an integrated suction nozzle, such as the screw-off multi-purpose suction nozzle disclosed in patent CN223162360U. Its diamond-shaped base is connected to the suction nozzle cap by a connecting strap. Although this solves the problem of easy loss or accidental swallowing, the diamond-shaped base, the suction nozzle body, and the suction nozzle cap still need to be injection molded separately and then assembled together. One end of the connecting strap needs to be fixed to the diamond-shaped base by ultrasonic welding, and the other end is fitted onto the bottom of the suction nozzle cap.

[0006] Therefore, the entire production process of the nozzle still involves multiple injection molding processes (diamond base, nozzle body, nozzle cover, connecting strip) and ultrasonic welding (connecting strip and diamond base). The process is relatively complex and time-consuming, which to some extent restricts the production efficiency of the nozzle. In addition, the more parts that are injection molded, the higher the mold opening cost, which will inevitably increase the production cost of the enterprise.

[0007] In conclusion, the current nozzle structure and production methods still need improvement. Summary of the Invention

[0008] To address the aforementioned problems, this invention provides an integrated suction nozzle for a stand-up pouch, comprising a base, a tube, a cover, and a connecting part. The tube is longitudinally mounted on the base, with a cavity inside the tube penetrating the bottom of the base. The cover is positioned on the top of the tube. The connecting part is located on one side of the tube, with its upper end connected to the side wall of the cover and its lower end connected to the top of the base. An inverted conical connecting ring is provided between the cover and the tube. The base, tube, cover, connecting part, and inverted conical connecting ring are all integrally injection molded. The upper end face of the inverted conical connecting ring is connected to the bottom end face of the cover, and the lower end face of the inverted conical connecting ring is connected to the top end face of the tube. Both the upper and lower ends of the inverted conical connecting ring have internal grooves. The wall thickness of the conical connecting ring is less than the wall thickness of the tube and the cover. The tube is a conical cylinder that is narrower at the top and wider at the bottom, and the inner diameter of the cover is greater than the outer diameter at the upper 1 / 5 of the tube.

[0009] Furthermore, the connecting part includes an upper ring body, a lower ring body, an upper connecting arm, and a lower connecting arm. The outer circumferential walls of the upper ring body and the lower ring body are connected to form an "8" shaped structure. One end of the upper connecting arm is connected to the upper ring body, and the other end is connected to the first protrusion on the outer wall of the cover. One end of the lower connecting arm is connected to the lower ring body, and the other end is connected to the top of the base.

[0010] Furthermore, a second protrusion is provided on the outer side wall of the cover, and the first protrusion and the second protrusion are arranged opposite each other along the radial direction of the cover.

[0011] Furthermore, each end of the base is provided with a connecting plate extending laterally, and the thickness of the connecting plate is 0.5-1mm.

[0012] Furthermore, the outer wall of the base is provided with a grid-like rib.

[0013] On the other hand, the present invention also provides a secondary shaping fixture for producing the above-mentioned nozzle, including a worktable, an upper mold, a lower mold, a forming mechanism, and a lifting mechanism. The lower mold is fixedly arranged on the worktable, and the upper mold is correspondingly arranged above the lower mold. The structures of the upper mold and the lower mold are symmetrical to each other, and both include cavities that match the outer contour of the nozzle. The cavity positions corresponding to the tube body and the inverted conical connecting ring are hollowed-out parts. A forming mechanism is provided at the top of the upper mold and the bottom of the lower mold. The lifting mechanism is arranged at the bottom of the worktable and is connected to the upper mold in a transmission manner.

[0014] Furthermore, the molding mechanism includes a first driving unit, a connecting block, a heat insulation seat, and a mold sleeve. The first driving unit is longitudinally arranged at the top of the upper mold / bottom of the lower mold via a bracket. The connecting block is fixedly arranged at the end of the driving rod of the first driving unit. The heat insulation seat is fixedly arranged on the connecting block. The mold sleeve is arranged on the heat insulation seat and corresponds to the position of the hollow part. A heating film is embedded inside the mold sleeve.

[0015] Furthermore, the die sleeve is a semi-cylindrical structure that matches the outer contours of the tube body and the inverted conical connecting ring.

[0016] Furthermore, the lifting mechanism includes a second driving unit, a lifting plate, and sliding rods. The second driving unit is fixedly arranged at the bottom of the workbench longitudinally. The lifting plate is arranged transversely at the end of the driving rod of the second driving unit. The sliding rods are evenly distributed at the four corners of the lifting plate longitudinally and slide upward through the lower die and are fixedly connected to the bottom of the upper die.

[0017] Furthermore, the lifting plate is a "return" - shaped frame structure and is sleeved outside the forming mechanism, and the two do not contact each other.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In the nozzle structure of the present invention, the base, the tube body, the cover body, the connecting part, and the inverted conical connecting ring are all integrally injection - molded. The overall structure of the nozzle can be formed through one mold opening and one injection molding, and then secondary shaping is carried out through a shaping tooling, thus completing the final shaping of the nozzle. This reduces the number of mold openings and injection moldings, reduces costs, and significantly improves the production efficiency of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is the overall structure schematic diagram of the nozzle in the present invention;

[0022] Figure 2 It is the axial structure sectional view of the nozzle in the present invention;

[0023] Figure 3 It is Figure 2 The enlarged view of the partial structure at A in

[0024] Figure 4 It is the structure schematic diagram of the nozzle cover body after being unscrewed in the present invention;

[0025] Figure 5 It is the connection state schematic diagram of the nozzle and the stand - up pouch in the present invention;

[0026] Figure 6 It is the overall structure schematic diagram of the secondary shaping tooling in the present invention;

[0027] Figure 7This is a schematic diagram of the lifting mechanism in this invention;

[0028] Figure 8 This is a schematic diagram of the forming mechanism in this invention;

[0029] Figure 9 This is an axial structural cross-sectional view of the forming mechanism in this invention;

[0030] Figure 10 This is an axial structural cross-sectional view of the mold sleeve in this invention;

[0031] Figure 11 This is a schematic diagram of the secondary shaping process of the nozzle in this invention.

[0032] Figure label:

[0033] 1-Base, 2-Tube body, 3-Cover body, 31-First protrusion, 32-Second protrusion, 4-Connecting part, 41-Upper ring body, 42-Lower ring body, 43-Upper connecting arm, 44-Lower connecting arm, 5-Grid-shaped rib, 6-Connecting plate, 7-Inverted conical connecting ring, 8-Inner groove;

[0034] 10-Workbench, 20-Upper mold, 30-Lower mold, 40-Forming mechanism, 401-First drive unit, 402-Connecting block, 403-Heat insulation seat, 404-Mold sleeve, 405-Bracket, 406-Heating film, 50-Lifting mechanism, 501-Second drive unit, 502-Lifting plate, 503-Slide rod, 60-Cavity, 70-Hollow section. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0037] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0038] In the description of the embodiments, unless otherwise explicitly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example 1:

[0040] like Figure 1-5 As shown, the stand-up pouch nozzle in this embodiment includes a base 1, a tube 2, a cover 3, and a connecting part 4. The tube 2 is arranged longitudinally on the base 1 and the cavity inside the tube 2 penetrates the bottom of the base 1. The cover 3 is arranged on the top of the tube 2. The connecting part 4 is arranged on one side of the tube 2 and its upper end is connected to the side wall of the cover 3, and its lower end is connected to the top of the base 1.

[0041] The outer wall of the base 1 is provided with a grid-like rib 5 to facilitate sealing and fixing with the stand-up pouch. Each end of the base 1 has a connecting plate 6 extending laterally, with a thickness of 0.5-1mm. The connecting plate 6 also serves to connect and fix the stand-up pouch. Because the base 1 is relatively wide, the transition at the edge of the stand-up pouch is significant, which can easily lead to a loose connection. The connecting plate 6 provides effective cushioning for the transition, allowing for a larger space for the stand-up pouch to connect before closing, thus improving the connection strength between the stand-up pouch and the nozzle.

[0042] The connecting part 4 includes an upper ring body 41, a lower ring body 42, an upper connecting arm 43, and a lower connecting arm 44. The outer circumferential walls of the upper ring body 41 and the lower ring body 42 are connected to form an "8"-shaped structure, which can improve the convenience of holding and carrying. One end of the upper connecting arm 43 is connected to the upper ring body 41, and the other end is connected to the first protrusion 31 on the outer wall of the cover body 3. One end of the lower connecting arm 44 is connected to the lower ring body 42, and the other end is connected to the top of the base 1.

[0043] A second protrusion 32 is also provided on the outer side wall of the cover 3, and the first protrusion 31 and the second protrusion 32 are arranged opposite each other along the radial direction of the cover 3.

[0044] An inverted conical connecting ring 7 is provided between the cover 3 and the tube 2. The base 1, tube 2, cover 3, connecting part 4 and inverted conical connecting ring 7 are all integrally injection molded. The upper end face of the inverted conical connecting ring 7 is connected to the bottom end face of the cover 3, and the lower end face of the inverted conical connecting ring 7 is connected to the top end face of the tube 2.

[0045] The inverted conical connecting ring 7 has inner grooves 8 at both the upper and lower ends. The shape of the inner grooves 8 can be arc, rectangle, triangle, trapezoid, etc. The wall thickness of the conical connecting ring 7 is 0.3-0.5mm, which is less than the wall thickness of the tube body 2 and the cover body 3, so that it can be unscrewed before use. The tube body 2 is a conical cylinder that is narrow at the top and wide at the bottom, and the inner diameter of the cover body 3 is greater than the outer diameter at the upper 1 / 5 of the tube body 2, so that the cover body 3 can be fastened to the upper part of the tube body 2 after the conical connecting ring 7 is unscrewed.

[0046] After the conical connecting ring 7 is broken off, it may be partially connected to the cover 3 or the tube 2. You can tear off the remaining part by hand, or you can leave it on without affecting normal use.

[0047] When using this nozzle, hold the first protrusion 31 and the second protrusion 32 and rotate the cap 3 slightly. Because the wall thickness at the inner groove 8 is relatively thin, it will break off at this point, and then you can drink the beverage from the stand-up pouch. After drinking, the cap 3 can be fastened to the upper part of the tube 2, and the two are tightly fitted by an interference fit. Since the nozzle is made entirely of plastic, both the cap 3 and the tube 2 will deform appropriately during the process of fastening the cap 3 to the tube 2, thus achieving a tight connection between the cap 3 and the tube 2.

[0048] Example 2:

[0049] like Figure 6-7 As shown, the secondary shaping fixture for producing the nozzle in this embodiment includes a worktable 10, an upper mold 20, a lower mold 30, a forming mechanism 40, and a lifting mechanism 50. The lower mold 30 is fixedly mounted on the worktable 10, and the upper mold 20 is correspondingly mounted above the lower mold 30. The upper mold 20 and the lower mold 30 are symmetrical in structure and both include cavities 60 that match the shape of the nozzle. The cavity positions corresponding to the tube body 2 and the inverted conical connecting ring 7 are hollowed-out portions 70. A forming mechanism 40 is provided at the top of the upper mold 20 and the bottom of the lower mold 30. The lifting mechanism 50 is located at the bottom of the worktable 10 and is connected to the upper mold 20 in a transmission manner.

[0050] The lifting mechanism 50 includes a second drive unit 501, a lifting plate 502, and a slide rod 503. The second drive unit 501 is fixedly mounted longitudinally at the bottom of the worktable 10. The lifting plate 502 is laterally mounted at the end of the drive rod of the second drive unit 501. The slide rod 503 is evenly distributed longitudinally at the four corners of the lifting plate 502 and slides upward through the lower mold 30 before being fixedly connected to the bottom of the upper mold 20. To improve the sliding connection effect between the slide rod 503 and the lower mold 30, a sliding sleeve or sliding bearing can be provided between the lower mold 30 and the slide rod 503, or conventional lubrication measures in the art can be adopted, such as applying lubricating grease or adding lubricating oil.

[0051] The lifting plate 502 is a "hui"-shaped frame structure and is sleeved outside the molding mechanism 40, and the two do not contact each other, so that the movement of the lifting plate 502 does not interfere with the molding mechanism 40.

[0052] As Figure 8-10 shown, the molding mechanism 40 includes a first driving unit 401, a connecting block 402, a heat insulation seat 403 and a die sleeve 404. The first driving unit 401 is arranged longitudinally on the top of the upper mold 20 / the bottom of the lower mold 30 through a bracket 405. The connecting block 402 is fixedly arranged at the end of the driving rod of the first driving unit 401. The heat insulation seat 403 is fixedly arranged on the connecting block 402. The die sleeve 404 is arranged on the heat insulation seat 403 and corresponds to the position of the hollow part 70. A heating film 406 is embedded inside the die sleeve 404. The die sleeve 404 can be driven in and out of the hollow part 70 by the first driving unit 401 so that the die sleeve 404 contacts the outer wall of the tube body 2 of the suction nozzle and is shaped.

[0053] Among them, the first driving unit 401 and the second driving unit 501 can adopt common linear driving methods in the field such as cylinders, oil cylinders, linear motors, electric push rods, etc. Those skilled in the art can reasonably select according to actual needs.

[0054] The heat insulation seat 403 can be made of a block made of ceramic fiber or aluminum silicate. The die sleeve 404 is a semi-cylindrical structure matching the outer contours of the tube body 2 and the inverted conical connecting ring 7. Flanges are provided at positions corresponding to the two inner grooves 8, and the arc circumference of the die sleeve 404 is less than half of the circumferences of the tube body 2 and the inverted conical connecting ring 7. The heating film 406 can adopt common PI heating films, PET heating films, graphene heating films, etc. in the field. The above-mentioned film sheets are all flexible materials and can be customized according to the shape of the die sleeve 404. Its power cord extends from one end of the die sleeve 404 and is respectively connected to the positive and negative poles of the heating power supply.

[0055] The working temperature of the heating film 406 is 40 - 150 °C, which is specifically set according to the material of the suction nozzle, as long as it is ensured that the working temperature of the heating film 406 can cause the material to undergo thermal deformation. For example, the heat distortion temperature of PP material is about 110 °C, the heat distortion temperature of PET material is about 85 °C, and the heat distortion temperature range of PE material is relatively wide. Among them, the heat distortion temperature of low-density polyethylene (LDPE) is about 38 - 50 °C, the heat distortion temperature of medium-density polyethylene (MDPE) is about 50 - 75 °C, and the heat distortion temperature of high-density polyethylene (HDPE) is about 60 - 80 °C.

[0056] During specific use, place the suction nozzle formed by one-time injection molding in the cavity 60 of the lower mold 30; during the one-time injection molding process, for convenient demolding, at this time, the inner cavities of the tube body 2 and the cover body 3 are standard cylindrical shapes (as Figure 11(As shown); then the lifting mechanism 50 drives the upper mold 20 to move down and engage with the lower mold 30, completing the mold closing action, thereby fixing the suction nozzle.

[0057] Subsequently, the upper and lower forming mechanisms 40 operate simultaneously, driving the mold sleeve 404 to adhere to the upper and lower sides of the nozzle tube body 2 and the inverted conical connecting ring 7 respectively through the first driving unit 401. The heating film 406 also works synchronously to heat the tube body 2 and the inverted conical connecting ring 7, softening them.

[0058] Subsequently, the first drive unit 401 continues to operate, causing the upper and lower mold sleeves 404 to move closer together. Since the tube body 2 and the inverted conical connecting ring 7 have been softened, they will contract inward under external force. Furthermore, since the cover 3 has not been softened, the connection between the tube body 2 and the cover 3 will be stretched and thinned during the inward movement of the mold sleeve 404, thus forming the inverted conical connecting ring 7. The secondary movement distance of the mold sleeve 404 is set according to the wall thickness of the tube body 2 and the cover 3, typically 1-2 times the wall thickness, to prevent excessive movement that could break the inverted conical connecting ring 7.

[0059] After thermoforming is completed, the heating film 406 stops heating, allowing the nozzle to cool and solidify. To improve cooling and solidification efficiency, air cooling technology (such as a cold air blower) can be used to quickly cool the nozzle.

[0060] In summary, in the nozzle structure of the present invention, the base 1, tube 2, cover 3, connecting part 4, and inverted conical connecting ring 7 are all integrally injection molded. The injection mold and the secondary molding mold can adopt the same mold design scheme. Only the hollow part 70 needs to be opened on the secondary molding mold (i.e., the upper mold 20 and the lower mold 30). Other structures do not need to be modified. Therefore, the nozzle structure can be integrally formed with only one mold opening and one injection, which greatly reduces the number of mold openings and injections. Ultrasonic welding process is not required in the later stage, which significantly reduces the production cost of enterprises and improves production efficiency.

[0061] In the secondary shaping fixture of the present invention, the nozzle formed by the molding mechanism 40 is subjected to secondary thermoforming. Compared with multiple injection molding, the heating temperature and energy consumption of secondary thermoforming are lower, which is conducive to further cost saving.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them; when the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by the present invention.

Claims

1. A stand-up pouch nozzle, comprising a base, a tube, a cover, and a connecting part, wherein the tube is longitudinally disposed on the base and a cavity inside the tube penetrates the bottom of the base, the cover is disposed on the top of the tube, and the connecting part is disposed on one side of the tube, with its upper end connected to the side wall of the cover and its lower end connected to the top of the base, characterized in that: A tapered connecting ring is provided between the cover body and the pipe body. The base, the pipe body, the cover body, the connecting part and the tapered connecting ring are all integrally injection-molded. The upper end face of the tapered connecting ring is connected to the bottom end face of the cover body, and the lower end face of the tapered connecting ring is connected to the top end face of the pipe body. Inner grooves are provided at both the upper and lower ends of the tapered connecting ring. The wall thickness of the tapered connecting ring is smaller than the wall thicknesses of the pipe body and the cover body. The pipe body is a conical cylinder with a narrower upper part and a wider lower part, and the inner diameter of the cover body is larger than the outer diameter of the pipe body at the 1 / 5 upper part.

2. The integrated suction nozzle for stand-up pouches according to claim 1, characterized in that: The connecting part includes an upper ring body, a lower ring body, upper connecting arms and lower connecting arms. The circumferential outer walls of the upper ring body and the lower ring body are connected in a transitional manner to form an "8"-shaped structure. One end of the upper connecting arm is connected to the upper ring body, and the other end is connected to a first convex block on the outer side wall of the cover body. One end of the lower connecting arm is connected to the lower ring body, and the other end is connected to the top of the base.

3. The integrated suction nozzle for stand-up pouches according to claim 2, characterized in that: A second convex block is further provided on the outer side wall of the cover body. The first convex block and the second convex block are arranged opposite to each other along the radial direction of the cover body.

4. The integrated suction nozzle for a stand-up pouch according to claim 1, characterized in that: A connecting plate extending transversely is provided at each end of the base. The thickness of the connecting plate is 0.5 - 1 mm.

5. The integrated suction nozzle for a stand-up pouch according to claim 1, characterized in that: Mesh-shaped convex ribs are provided on the outer side wall of the base.

6. A secondary shaping tooling for producing the integrated suction nozzle according to any one of claims 1-5, characterized in that: It includes a workbench, an upper mold, a lower mold, a molding mechanism and a lifting mechanism. The lower mold is fixedly arranged on the workbench, and the upper mold is correspondingly arranged above the lower mold. The structures of the upper mold and the lower mold are symmetrical to each other and both include cavities matching the outer contour of the suction nozzle. The cavity positions corresponding to the pipe body and the tapered connecting ring are hollow parts. A molding mechanism is provided at the top of the upper mold and the bottom of the lower mold respectively. The lifting mechanism is arranged at the bottom of the workbench and is in driving connection with the upper mold.

7. The secondary shaping fixture according to claim 6, characterized in that: The molding mechanism includes a first driving unit, a connecting block, a heat insulation seat and a mold sleeve. The first driving unit is arranged longitudinally on the top of the upper mold / the bottom of the lower mold through a bracket. The connecting block is fixedly arranged at the end of the driving rod of the first driving unit. The heat insulation seat is fixedly arranged on the connecting block. The mold sleeve is arranged on the heat insulation seat and corresponds to the position of the hollow part. A heating film is embedded inside the mold sleeve.

8. The secondary shaping fixture according to claim 7, characterized in that: The mold sleeve is a semi-cylindrical structure matching the outer contours of the pipe body and the tapered connecting ring.

9. The secondary shaping fixture according to claim 6, characterized in that:

10. The secondary shaping fixture according to claim 9, characterized in that: The lifting mechanism includes a second driving unit, a lifting plate and sliding rods. The second driving unit is fixedly arranged longitudinally at the bottom of the workbench. The lifting plate is arranged transversely at the end of the driving rod of the second driving unit. The sliding rods are evenly distributed at the four corners of the lifting plate longitudinally and slide upward through the lower mold and then are fixedly connected to the bottom of the upper mold. The lifting plate is a "return"-shaped frame structure and is sleeved outside the molding mechanism, and the two do not contact each other.

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