Secondary feeding mechanism for water floating cylinder rotational molding forming mold

Abstract

The utility model belongs to mould technical field relates to a kind of secondary feeding mechanism of water floating cylinder rotational moulding forming mould.The utility model, including rotational moulding upper die and rotational moulding lower die, first forming chamber and upper die injection head are equipped in the rotational moulding upper die, second forming chamber and lower die injection head are equipped in the rotational moulding lower die, the shape of first forming chamber and second forming chamber is matched.The utility model in use, by the closed injection channel formed by upper die injection head and lower die injection head, different performance rotational moulding raw material (such as first injection conventional PE raw material forming floating cylinder main body, second injection high-strength PE raw material forming floating cylinder support leg) can be injected into mould cavity twice, both ensure the lightweight and cost controllable of floating cylinder main body, and the support strength of support leg is strengthened, effectively solve the performance and cost contradiction caused by traditional mould single raw material forming.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology and relates to a secondary feeding mechanism for a waterborne pontoon rotational molding mold. Background Technology

[0002] In the production of floating pontoons, rotational molding is widely used because it can achieve one-piece molding of complex shapes. However, traditional rotational molding molds for floating pontoons have many technical defects: On the one hand, most molds only have a single molding chamber and a single injection channel, which cannot meet the differentiated requirements of different structural parts of the pontoon ("body + legs") for material properties (such as strength and toughness). If the same material is used for molding, it is easy to lead to insufficient support strength of the legs or excessive cost of the body. On the other hand, the pontoon legs usually need to be designed with detailed structures such as concave holes and convex surfaces to adapt to subsequent installation and anti-slip requirements. The leg molding structure of traditional molds is mostly integral, which makes it difficult to accurately mold such complex details. Moreover, misalignment of the cavity is prone to occur when the mold is closed, resulting in burrs and gaps at the connection between the legs and the body, affecting the product's sealing performance and service life. In addition, traditional molds lack efficient positioning and fixing structures, and the alignment accuracy of the upper and lower molds is low during the mold closing process, which not only increases the product scrap rate but also prolongs the production cycle. At the same time, mold cooling mostly relies on natural cooling, which is inefficient and further restricts the improvement of production efficiency. Therefore, there is an urgent need to design a secondary feeding mechanism for the rotational molding mold of the floating pontoon that can overcome the above defects.

[0003] To overcome the shortcomings of existing technologies, people have continuously explored and proposed various solutions. For example, a Chinese patent discloses a rotational molding mold [application number: 201210308619.X], which includes: several semi-circular upper molds and several semi-circular lower molds that interlock to form a hollow cylindrical can, and a cap that interlocks with the semi-circular upper and lower molds. The upper and lower molds have first and second ribs protruding radially outward and parallel to the axis of the can. The first and second ribs also have first and second protrusions protruding radially outward, respectively. The first and second protrusions are staggered along the axis of the can. However, this solution still cannot meet the differentiated requirements of different structural parts for material properties (such as strength and toughness) during rotational molding. It is difficult to accurately mold complex details, and misalignment of the cavity is prone to occur when the mold is closed, resulting in burrs and gaps at the joints, which affect the sealing performance and service life of the product. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a secondary feeding mechanism for a waterborne pontoon rotational molding mold.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A secondary feeding mechanism for a rotomolding mold of a floating pontoon includes an upper rotomolding mold and a lower rotomolding mold. The upper rotomolding mold has a first molding chamber and an upper mold injection head, and the lower rotomolding mold has a second molding chamber and a lower mold injection head. The shapes of the first and second molding chambers are matched. When the molds are closed, the upper mold injection head and the lower mold injection head fit together to form an injection channel. The first molding chamber has an upper molding structure for the pontoon support connected to the first molding chamber, and the second molding chamber has a lower molding structure for the pontoon support connected to the second molding chamber. When the molds are closed, the upper molding structure and the lower molding structure for the pontoon support are aligned. A serrated alignment member is provided between the upper and lower rotomolding molds.

[0006] In the above-mentioned secondary feeding mechanism of the rotomolding mold for floating pontoons, the upper forming structure of the pontoon support includes four upper forming cavities of the pontoon support located around the first forming chamber, and the upper forming cavities of the pontoon support have a number of upper concave hole forming protrusions.

[0007] In the above-mentioned secondary feeding mechanism of the rotomolding mold for floating pontoons, the upper forming cavity of the pontoon support foot also has a central concave-convex surface forming block of the upper part of the support foot, and the central concave-convex surface forming block of the upper part of the support foot and the concave hole forming protrusion of the upper part of the support foot are arranged alternately.

[0008] In the above-mentioned secondary feeding mechanism of the rotomolding mold for floating pontoons, the lower forming structure of the pontoon support includes four lower forming cavities of the pontoon support located around the second forming chamber, and the lower forming cavities of the pontoon support have a number of lower forming protrusions with concave holes.

[0009] In the above-mentioned secondary feeding mechanism of the rotomolding mold for floating pontoons, the lower forming cavity of the pontoon support foot also has a central concave-convex surface forming block at the lower part of the support foot, and the central concave-convex surface forming block at the lower part of the support foot and the concave hole forming protrusion at the lower part of the support foot are arranged alternately.

[0010] In the secondary feeding mechanism of the above-mentioned waterborne pontoon rotational molding mold, when the mold is closed, the upper concave hole forming protrusion of the support leg is directly opposite to the lower concave hole forming protrusion of the support leg, and the upper central concave-convex surface forming block of the support leg is directly opposite to the lower central concave-convex surface forming block of the support leg.

[0011] In the above-mentioned secondary feeding mechanism of the rotomolding mold for floating pontoons, the serrated alignment component includes four upper mold serrated alignment plates disposed on the upper mold of the rotomolding and four lower mold serrated alignment plates disposed on the lower mold of the rotomolding. When the mold is closed, the upper mold serrated alignment plates and the lower mold serrated alignment plates are engaged and matched.

[0012] In the above-mentioned secondary feeding mechanism of the rotomolding mold for floating pontoons, the upper rotomolding mold is provided with four upper mold holding plates, and the lower rotomolding mold is provided with four lower mold holding plates. When the mold is closed, the upper mold holding plates and the lower mold holding plates are fixed together by bolts.

[0013] In the secondary feeding mechanism of the above-mentioned waterborne pontoon rotational molding mold, cooling pipes are provided in the upper and lower rotational molding molds.

[0014] In the above-mentioned secondary feeding mechanism of the waterborne pontoon rotational molding mold, the bottom of the first molding chamber has a plurality of first ejection holes communicating with the first molding chamber, and the top of the second molding chamber has a plurality of second ejection holes communicating with the second molding chamber.

[0015] Compared with existing technologies, the advantages of this utility model are: 1. In the process of use, this utility model can inject rotational molding materials with different properties into the mold cavity in two stages through the closed injection channel formed by the upper mold injection head and the lower mold injection head (such as injecting conventional PE material to form the main body of the float in the first stage and injecting high-strength PE material to form the support legs in the second stage). This not only ensures the lightweight and cost controllable nature of the main body of the float, but also strengthens the support strength of the support legs, effectively solving the contradiction between performance and cost caused by the single material molding of traditional molds.

[0016] 2. This utility model designs a split cavity with an "upper forming structure + lower forming structure" for the pontoon support legs. The cavity is equipped with a support leg concave hole forming protrusion and a central concave-convex surface forming block. When the mold is closed, the upper and lower protrusions and forming blocks are precisely aligned, which can form the concave holes, concave-convex surfaces and other detailed structures of the support legs in one step, avoiding subsequent processing steps. At the same time, it eliminates the problems of incomplete forming of support leg details and burrs at the joints caused by structural design defects of traditional molds, thereby improving the sealing performance and structural stability of the pontoon.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the upper mold for rotational molding.

[0020] Figure 3 This is a schematic diagram of the structure of the rotational molding upper mold from another direction.

[0021] Figure 4 This is a schematic diagram of the rotational molding lower mold.

[0022] Figure 5 This is a schematic diagram of the structure of the rotational molding lower mold from another direction.

[0023] In the diagram: 1. Rotational molding upper mold; 2. Rotational molding lower mold; 3. First molding chamber; 4. Upper mold injection head; 5. Second molding chamber; 6. Lower mold injection head; 7. Upper molding structure of float support; 8. Lower molding structure of float support; 9. Serrated alignment part; 10. Upper molding cavity of float support; 11. Upper concave hole molding protrusion of support; 12. Upper central concave-convex surface molding block of support; 13. Lower molding cavity of float support; 14. Lower concave hole molding protrusion of support; 15. Lower central concave-convex surface molding block of support; 16. Serrated alignment plate of upper mold; 17. Serrated alignment plate of lower mold; 18. Upper mold holding plate; 19. Lower mold holding plate; 20. Cooling pipe; 21. First ejection hole; 22. Second ejection hole. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1-5 As shown, a secondary feeding mechanism for a rotomolding mold of a floating pontoon includes a rotomolding upper mold 1 and a rotomolding lower mold 2. The rotomolding upper mold 1 is provided with a first molding chamber 3 and an upper mold injection head 4. The rotomolding lower mold 2 is provided with a second molding chamber 5 and a lower mold injection head 6. The shapes of the first molding chamber 3 and the second molding chamber 5 are matched. When the mold is closed, the upper mold injection head 4 and the lower mold injection head 6 fit together to form an injection channel. The first molding chamber 3 is provided with an upper molding structure 7 for the pontoon support foot that is connected to the first molding chamber 3. The second molding chamber 5 is provided with a lower molding structure 8 for the pontoon support foot that is connected to the second molding chamber 5. When the mold is closed, the upper molding structure 7 and the lower molding structure 8 for the pontoon support foot are positioned opposite each other. A serrated alignment member 9 is provided between the rotomolding upper mold 1 and the rotomolding lower mold 2.

[0026] In this embodiment, during the injection molding process, a first molding chamber 3 is formed inside the upper rotational molding mold 1, which corresponds to the upper half of the float body shape; a second molding chamber 5 is formed inside the lower rotational molding mold 2, which corresponds to the lower half of the float body shape, and the contours and dimensions of the first molding chamber 3 and the second molding chamber 5 are completely matched. After the mold is closed, a closed cavity with the same shape as the float body can be formed. An upper mold injection head 4 is provided on the side wall of the upper rotational molding mold 1, and a lower mold injection head 6 is provided at the corresponding position on the side wall of the lower rotational molding mold 2. When the mold is closed, the end face of the upper mold injection head 4 and the end face of the lower mold injection head 6 are tightly fitted together, forming a closed injection channel with both ends connected to the external raw material supply device and the internal cavity respectively. Different raw materials can be injected into the cavity twice by controlling the raw material supply device—for example, low-density PE raw material is injected into the main body area of ​​the first molding chamber 3 and the second molding chamber 5 in the first injection, and the raw material is initially melted. After adhering to the cavity wall, high-density PE raw material is injected a second time into the foot forming structure area described later, realizing differentiated material forming of the float body and the foot, solving the problem that traditional molds cannot balance performance and cost with a single raw material. The upper forming structure 7 of the float foot is integrally formed around the first forming chamber 3 (corresponding to the upper position of the float foot), and the lower forming structure 8 of the float foot is integrally formed around the second forming chamber 5 (corresponding to the lower position of the float foot). When the mold is closed, the two are facing each other and connected, forming 4 complete float foot forming cavities (adapting to the 4 feet of the float), realizing the integrated forming of the float body and the foot, eliminating the need for subsequent assembly, and improving production efficiency. A serrated alignment part 9 is installed between the edge of the upper rotational molding mold 1 and the edge of the lower rotational molding mold 2. When the mold is closed, the serrated structure is used to ensure precise alignment of the upper and lower molds, avoiding product defects caused by cavity misalignment.

[0027] Combination Figure 1-5 As shown, the upper forming structure 7 of the float support includes four upper forming cavities 10 of the float support located around the first forming chamber 3, and the upper forming cavities 10 of the float support have a plurality of upper concave hole forming protrusions 11.

[0028] Specifically, each float support leg has several integrally formed protrusions 11 on the inner wall of the upper forming cavity 10. The shape and size of these protrusions perfectly match the recesses to be formed on the upper part of the float support leg. When the raw material is filled into the upper forming cavity 10 of the float support leg, the protrusions 11 will prevent the raw material from adhering. After the product is formed, the recesses are formed at the locations of the protrusions. The creativity of this design lies in the fact that the recesses of the support leg are formed directly through the mold protrusion structure in one step, without the need for subsequent drilling. This not only simplifies the process but also avoids damage to the support leg structure that may occur during drilling, thereby improving the structural strength and production efficiency of the support leg.

[0029] The upper forming cavity 10 of the float support also has a central concave-convex surface forming block 12, which is staggered with the upper concave hole forming protrusion 11.

[0030] In this embodiment, to enhance the anti-slip performance and structural stability of the pontoon foot, an integrally formed upper central concave-convex surface forming block 12 is formed on the inner wall of the upper forming cavity 10 of the pontoon foot. This forming block is located at the center of the upper forming cavity 10 of the pontoon foot, and its surface is designed with an uneven textured structure (such as a diamond pattern). At the same time, the upper central concave-convex surface forming block 12 and the upper concave hole forming protrusion 11 are staggered, leaving sufficient space for material flow between them to ensure that the material can fully fill the cavity. The concave-convex surface is formed directly on the upper part of the foot by the forming block. Compared with the traditional method of post-attaching anti-slip pads, the anti-slip structure is integrated with the foot body, the anti-slip effect is more durable, and the problem of peeling off that may occur in the pasting process is avoided. At the same time, the staggered distribution structure not only ensures the functionality of the concave hole and the concave-convex surface, but also does not affect the flowability of the material filling, ensuring the forming quality of the foot.

[0031] Combination Figure 1 As shown, the lower forming structure 8 of the float support foot includes four lower forming cavities 13 of the float support foot located around the second forming chamber 5, and the lower forming cavities 13 of the float support foot have a plurality of lower forming protrusions 14 of the lower concave holes of the support foot.

[0032] In this embodiment, several protrusions 14 for forming concave holes at the lower part of each pontoon foot are integrally formed on the inner wall of the lower forming cavity 13. Their shape and size are completely consistent with the protrusions 11 for forming concave holes at the upper part of the foot, and their positions correspond one-to-one. The ingenuity of this design lies in the fact that, by setting corresponding protrusions for forming concave holes at the upper and lower parts, symmetrical concave holes can be formed simultaneously on the upper and lower surfaces of the pontoon foot. These concave holes can be used as connection holes during subsequent pontoon installation, and can also reduce the weight of the foot, achieving the dual effect of "lightweight + functionalization", solving the problem that traditional feet are either too heavy or have no installation holes.

[0033] The lower part of the pontoon support foot forming cavity 13 also has a lower part of the support foot central concave-convex surface forming block 15, and the lower part of the support foot central concave-convex surface forming block 15 and the lower part of the support foot concave hole forming protrusion 14 are arranged alternately.

[0034] In this embodiment, a central concave-convex surface forming block 15 for the lower part of the float support is integrally formed on the inner wall of the lower forming cavity 13. The forming block is located at the center of the lower forming cavity 13 of the float support. Its surface texture structure and size are completely consistent with the central concave-convex surface forming block 12 for the upper part of the support, and it is distributed alternately with the lower concave hole forming protrusion 14 for the lower part of the support.

[0035] Combination Figure 1-5As shown, when the mold is closed, the upper recessed hole forming protrusion 11 of the support leg is directly opposite to the lower recessed hole forming protrusion 14 of the support leg, and the upper central concave-convex surface forming block 12 of the support leg is directly opposite to the lower central concave-convex surface forming block 15 of the support leg.

[0036] In this embodiment, when the mold is closed, the upper forming cavity 10 of the float support foot and the lower forming cavity 13 of the float support foot are completely fitted together. At this time, the axis of the upper concave hole forming protrusion 11 of the support foot coincides with the axis of the lower concave hole forming protrusion 14 of the support foot. The two face each other to form a complete "protrusion group". After the raw material fills the cavity, the "protrusion group" will form through or symmetrical concave holes inside the support foot to ensure the positional accuracy and integrity of the concave holes. At the same time, the upper central concave-convex surface forming block 12 of the support foot and the lower central concave-convex surface forming block 12 of the support foot face each other. The concave and convex textures of the two are matched with each other and together form a continuous anti-slip texture on the upper and lower surfaces of the support foot.

[0037] The serrated alignment member 9 includes four upper mold serrated alignment plates 16 disposed on the upper mold 1 and four lower mold serrated alignment plates 17 disposed on the lower mold 2. When the mold is closed, the upper mold serrated alignment plates 16 and the lower mold serrated alignment plates 17 are engaged and matched.

[0038] In this embodiment, the serrated alignment member 9 includes four upper mold serrated alignment plates 16 and four lower mold serrated alignment plates 17. The four upper mold serrated alignment plates 16 are respectively fixed to the center of the four sides of the rotational molding upper mold 1 by bolts. The lower end face of each upper mold serrated alignment plate 16 is machined with a number of triangular serrations (serration angle is 60°). The four lower mold serrated alignment plates 17 are respectively fixed to the center of the four sides of the rotational molding lower mold 2 by bolts. The upper end face of each lower mold serrated alignment plate 17 is machined with triangular serrations that match those of the upper mold serrated alignment plates 16. When the mold is closed, the serrations of the upper mold serrated alignment plates 16 and the serrations of the lower mold serrated alignment plates 17 mesh and engage with each other. Through the mechanical limiting effect of the serrations, the relative movement of the rotational molding upper mold 1 and the rotational molding lower mold 2 in the horizontal direction is restricted.

[0039] Combination Figure 1-5 As shown, the upper rotational molding mold 1 is provided with four upper mold retaining plates 18, and the lower rotational molding mold 2 is provided with four lower mold retaining plates 19. When the molds are closed, the upper mold retaining plates 18 and the lower mold retaining plates 19 are fixed together by bolts.

[0040] In this embodiment, to ensure the sealing and stability of the mold after mold closing, upper mold retaining plates 18 are welded to the four sides of the upper mold 1 (located above the upper mold serrated alignment plate 16), and each upper mold retaining plate 18 has two bolt holes; lower mold retaining plates 19 are welded to the four sides of the lower mold 2 (located below the lower mold serrated alignment plate 17), and each lower mold retaining plate 19 has threaded holes corresponding to the bolt holes of the upper mold retaining plate 18. After mold closing, the bolts are passed through the bolt holes of the upper mold retaining plate 18 and screwed into the threaded holes of the lower mold retaining plate 19. Tightening the bolts makes the upper and lower molds fit tightly together, and at this time, a closed space is formed inside the cavity.

[0041] Combination Figure 1-5 As shown, cooling pipes 20 are provided inside the upper rotational molding die 1 and the lower rotational molding die 2.

[0042] In this embodiment, during the rotational molding process, after the raw material melts and adheres to the inner wall of the cavity and forms the required thickness, cooling water is introduced into the cooling pipe 20. The cooling water absorbs the heat of the mold and the product through the pipe, accelerating the cooling and shaping of the product.

[0043] Combination Figure 1-5 As shown, the bottom of the first molding chamber 3 has a plurality of first ejection holes 21 that communicate with the first molding chamber 3, and the top of the second molding chamber 5 has a plurality of second ejection holes 22 that communicate with the second molding chamber 5.

[0044] In this embodiment, after the product has cooled and solidified, before opening the mold, the ejector rod of the external ejector device is inserted into the first ejector hole 21 and the second ejector hole 22. The ejector rod pushes the product away from the inner wall of the first molding chamber 3 and the second molding chamber 5, so as to realize the rapid removal of the product.

[0045] The working principle of this utility model is as follows: Align the upper rotational molding mold 1 and the lower rotational molding mold 2, so that the serrations of the upper mold serration alignment plate 16 and the lower mold serration alignment plate 17 engage and lock together, achieving precise alignment of the upper and lower molds; then, pass the bolts through the holes of the upper mold retaining plate 18 and the lower mold retaining plate 19 and tighten them, so that the upper and lower molds fit tightly together. At this time, the first molding chamber 3 and the second molding chamber 5 constitute the main cavity of the float, the upper molding structure 7 of the float support and the lower molding structure 8 of the float support constitute four support cavities, and the upper mold injection head 4 and the lower mold injection head 6 constitute a closed injection channel, which will... An external raw material supply device is connected to the injection channel, injecting the first batch of raw material (such as low-density PE powder) into the cavity. The raw material flows into the base area of ​​the float body cavity and the support cavity through the injection channel. Then, the raw material supply device is shut off, and the rotational molding equipment is started to rotate the mold around two axes (horizontal and vertical). During rotation, the raw material adheres evenly to the inner wall of the cavity under centrifugal force, initially melting to form the base layer of the float body and support. The mold is kept rotating, and continuous heating ensures that the first batch of raw material completely melts and bonds tightly to the cavity wall, forming... The basic structure of the float body and legs is formed. At this point, the basic layer has a certain structural strength to support the attachment of the second batch of raw materials. After the first batch of raw materials is initially formed, the raw material supply device is restarted to inject the second batch of raw materials (such as high-density PE powder) into the injection channel. Since the first batch of raw materials has formed a basic layer on the cavity wall, the second batch of raw materials will first fill the remaining area of ​​the leg cavity (the part that needs to be strengthened) and the key stress area of ​​the float body cavity. Then, the mold continues to rotate so that the second batch of raw materials is evenly attached to the surface of the basic layer to form a reinforcing layer. Continuous heating and rotation make the second batch of raw materials fully integrated with the first batch of raw materials to form an integrated float structure (the main body is "basic layer + key area reinforcing layer", and the legs are "basic layer + full area reinforcing layer"). This ensures that there is no delamination between different material layers and improves the overall strength of the product. When the raw materials melt and adhere to the inner wall of the cavity and form the required thickness, cooling water is introduced into the cooling pipe 20. The cooling water absorbs the heat of the mold and the product through the pipe and accelerates the cooling and shaping of the product.

[0046] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model.

[0047] Although this article frequently uses terms such as 1. upper mold for rotational molding, 2. lower mold for rotational molding, 3. first molding chamber, 4. upper mold injection head, 5. second molding chamber, 6. lower mold injection head, 7. upper molding structure of the float support, 8. lower molding structure of the float support, 9. serrated alignment part, 10. upper molding cavity of the float support, 11. upper concave hole molding protrusion of the support, 12. upper central concave-convex surface molding block of the support, 13. lower molding cavity of the float support, 14. lower concave hole molding protrusion of the support, 15. lower central concave-convex surface molding block of the support, 16. upper mold serrated alignment plate, 17. lower mold serrated alignment plate, 18. upper mold holding plate, 19. lower mold holding plate, 20. cooling pipe, 21. first ejection hole, 22. second ejection hole, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A secondary feeding mechanism for a rotational molding die for a floating pontoon, comprising an upper rotational molding die (1) and a lower rotational molding die (2), characterized in that, The upper mold (1) of the rotational molding is provided with a first molding chamber (3) and an upper mold injection head (4). The lower mold (2) of the rotational molding is provided with a second molding chamber (5) and a lower mold injection head (6). The shapes of the first molding chamber (3) and the second molding chamber (5) are matched. When the mold is closed, the upper mold injection head (4) and the lower mold injection head (6) fit together to form an injection channel. The first molding chamber (3) is provided with a float support upper molding structure (7) connected to the first molding chamber (3). The second molding chamber (5) is provided with a float support lower molding structure (8) connected to the second molding chamber (5). When the mold is closed, the float support upper molding structure (7) and the float support lower molding structure (8) are arranged opposite each other. A serrated alignment part (9) is provided between the upper mold (1) and the lower mold (2).

2. The secondary feeding mechanism for the rotational molding die of the floating pontoon as described in claim 1, characterized in that, The upper forming structure (7) of the float support includes four upper forming cavities (10) of the float support located around the first forming chamber (3), and the upper forming cavities (10) of the float support have a number of upper concave hole forming protrusions (11).

3. The secondary feeding mechanism for the rotational molding die of the floating pontoon as described in claim 2, characterized in that, The upper forming cavity (10) of the float support also has a central concave-convex surface forming block (12) of the upper support, and the central concave-convex surface forming block (12) of the upper support and the concave hole forming protrusion (11) of the upper support are arranged alternately.

4. The secondary feeding mechanism for the rotational molding die of the floating pontoon as described in claim 3, characterized in that, The lower forming structure (8) of the pontoon support includes four lower forming cavities (13) of the pontoon support located around the second forming chamber (5), and the lower forming cavities (13) of the pontoon support have a number of lower forming protrusions (14) of the lower concave holes of the support.

5. The secondary feeding mechanism for the rotational molding die of the floating pontoon as described in claim 4, characterized in that, The lower forming cavity (13) of the float support foot also has a lower central concave-convex surface forming block (15), which is staggered with the lower concave hole forming protrusion (14).

6. The secondary feeding mechanism for the rotational molding die of the floating pontoon as described in claim 5, characterized in that, When the mold is closed, the upper recessed hole forming protrusion (11) of the support leg is directly opposite to the lower recessed hole forming protrusion (14), and the upper central concave-convex surface forming block (12) of the support leg is directly opposite to the lower central concave-convex surface forming block (15).

7. The secondary feeding mechanism for the rotational molding die of a floating pontoon according to any one of claims 1-6, characterized in that, The serrated alignment component (9) includes four upper mold serrated alignment plates (16) disposed on the upper mold (1) and four lower mold serrated alignment plates (17) disposed on the lower mold (2). When the mold is closed, the upper mold serrated alignment plates (16) and the lower mold serrated alignment plates (17) engage with each other.

8. The secondary feeding mechanism for the rotational molding die of the floating pontoon according to claim 7, characterized in that, The upper mold (1) of the rotational molding is provided with four upper mold retaining plates (18), and the lower mold (2) of the rotational molding is provided with four lower mold retaining plates (19). When the mold is closed, the upper mold retaining plates (18) and the lower mold retaining plates (19) are fixed together by bolts.

9. The secondary feeding mechanism for the rotational molding die of the floating pontoon according to claim 1, characterized in that, Cooling pipes (20) are provided inside the upper rotational molding die (1) and the lower rotational molding die (2).

10. The secondary feeding mechanism for the rotational molding die of the floating pontoon according to claim 1, characterized in that, The bottom of the first molding chamber (3) has a plurality of first ejection holes (21) communicating with the first molding chamber (3), and the top of the second molding chamber (5) has a plurality of second ejection holes (22) communicating with the second molding chamber (5).

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