A blow mould for a high speed boat hull which facilitates demoulding

Abstract

The utility model relates to the field of mould manufacturing, especially a speedboat hull blow mould convenient to demould. Including first mould and second mould, first mould and second mould are used for extruding plastic embryo into speedboat hull shape, still including cooling mechanism, air pipe etc.

Description

Technical Field

[0001] This utility model relates to the field of mold manufacturing, and in particular to a blow molding mold for speedboat hulls that is easy to demold. Background Technology

[0002] Blow molding, as a widely used manufacturing process for hollow plastic products, has been widely applied in the production of large hollow structural components such as speedboat hulls, storage tanks, and containers. In the blow molding process of speedboat hulls, the design of the mold has a decisive influence on the appearance quality, dimensional accuracy, and production efficiency of the final product. Traditional blow molding molds usually consist of two halves. After the blow molding and cooling are completed, the molded hull needs to be smoothly removed from the mold. This process is called "demolding".

[0003] Currently, the industry commonly uses a movable ejector plate inside the mold to achieve demolding. This method uses hydraulic or pneumatic power to drive the ejector plate to move synchronously along the inner surface of the mold cavity, pushing the formed hull out of the mold cavity as a whole. However, for products like speedboat hulls with complex curved surfaces, large surface areas, and relatively thin walls, this large-area contact mechanical ejection method has obvious drawbacks: on the one hand, the force is concentrated in the contact area between the ejector plate and the hull, and during the ejection process, excessive local pressure can easily cause indentations, dents, or even cracks on the hull surface; on the other hand, due to the complex shape of the hull, the ejector plate cannot completely fit all curved surfaces, resulting in uneven force distribution, which further increases the risk of surface damage. Utility Model Content

[0004] In view of this, the present invention provides a blow molding mold for speedboat hulls that is easy to demold, which can solve the shortcomings of existing blow molding molds that are prone to surface damage such as squeezing, indentation, dents or even cracking of the hull surface due to excessive local pressure during the ejection process.

[0005] The technical solution is as follows: A blow molding mold for a speedboat hull that facilitates demolding, comprising a first mold and a second mold, which are used to extrude a plastic preform into the shape of a speedboat hull. It also includes a cooling mechanism, a vent pipe, a hollow tube, a reset mechanism, and a baffle. Both the first and second molds are equipped with a cooling mechanism for cooling and shaping the plastic preform. Both the first and second molds have gas channels. Both the first and second molds have vent pipes connected to the gas channels. Hollow tubes are installed within the gas channels of both the first and second molds. A reset mechanism is slidably installed within the hollow tubes. A baffle is connected to the reset mechanism to block the opening of the gas channels. The reset mechanism is used to reset the baffle.

[0006] Furthermore, the side of the baffle is designed as a curved surface, which facilitates the separation of the baffle from the first mold and the second mold.

[0007] Furthermore, the cooling mechanism includes an inlet pipe and an outlet pipe. Both the first mold and the second mold have cavities. Both the first mold and the second mold have two liquid channels that communicate with the cavities. The sides of both the first mold and the second mold are equipped with inlet pipes and outlet pipes that communicate with the two liquid channels respectively.

[0008] Furthermore, the reset mechanism includes a movable rod and a spring. The movable rod is slidably disposed inside the hollow tube, a baffle is connected to the end of the movable rod, and a spring is connected between the other end of the movable rod and the inside of the hollow tube.

[0009] Furthermore, it also includes an electric push rod and a cutting blade. An electric push rod is installed at the bottom of the first mold, and a cutting blade is connected to the telescopic rod of the electric push rod. The cutting blade is used to cut the excess material on the edge of the speedboat hull.

[0010] Furthermore, it also includes a touch switch, which is installed on the first mold and is used to contact the second mold. The touch switch is also electrically connected to the electric push rod.

[0011] Furthermore, both the first mold and the second mold are provided with mounting holes spaced apart, which are used to install the first mold and the second mold.

[0012] Furthermore, it also includes hollow frames. Both the top of the first mold and the second mold are provided with hollow frames. The two hollow frames are provided with inclined surfaces on the side that is close to each other. The two inclined surfaces are in contact to cut off the excess material at the edge of the speedboat hull.

[0013] Furthermore, it also includes an inlet pipe and an outlet pipe. The inlet pipe is used to add coolant into the hollow frame, while the outlet pipe is used to discharge the coolant from the hollow frame.

[0014] Furthermore, it also includes guide cylinders, sliding rods, and magnetic strips. Guide cylinders are installed at intervals inside the hollow frame, sliding rods are slidably mounted on the guide cylinders, and magnetic strips are connected to the sliding rods. The magnetic strips are used to hold the plastic preform in place.

[0015] The beneficial effects are as follows: 1. By setting up a gas channel, hollow tube, reset mechanism and curved baffle in the mold, the present invention utilizes compressed air to automatically push open the baffle when the mold is opened, so that the gas is evenly sprayed out from the side wall of the inner cavity of the mold, forming an airflow layer between the speedboat hull and the mold wall. This airflow layer effectively reduces the adsorption force and frictional resistance between the two, realizes flexible demolding with uniform force, and significantly improves the surface quality and yield of the product.

[0016] 2. This utility model uses a linkage mechanism of touch switch, electric push rod and cutting blade to automatically trigger the cutting action when the mold is closed, cut the excess material on the edge of the speedboat hull, and promptly expel the residual air in the sealed cavity. This avoids the risk of bulging, bouncing or bursting caused by internal air pressure during subsequent manual processing, and significantly improves the safety of operation and the degree of automation of the process. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a three-dimensional structural diagram of the cooling mechanism of this utility model.

[0019] Figure 3 This is a three-dimensional structural diagram of the hollow tube, electric push rod, and cutting blade of this utility model.

[0020] Figure 4 This is a three-dimensional structural diagram of the reset mechanism of this utility model.

[0021] Figure 5 This is a three-dimensional structural diagram of the hollow frame, inlet pipe, and outlet pipe of this utility model.

[0022] Figure 6 This is a three-dimensional structural diagram of the guide cylinder, sliding rod, and magnetic strip of this utility model.

[0023] The parts and their numbers in the diagram are as follows: 1. First mold, 2. Second mold, 301. Cavity, 302. Liquid channel, 303. Liquid inlet pipe, 304. Liquid outlet pipe, 4. Gas channel, 5. Vent pipe, 6. Hollow tube, 701. Movable rod, 702. Spring, 8. Baffle, 9. Electric push rod, 10. Cutting blade, 11. Touch switch, 12. Mounting hole, 13. Hollow frame, 14. Water inlet pipe, 15. Water outlet pipe, 16. Guide cylinder, 17. Sliding rod, 18. Magnetic strip. Detailed Implementation

[0024] The preferred technical solution of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] Example: A blow molding mold for a speedboat hull that facilitates demolding, see [link / reference] Figures 1-4As shown, the system includes a first mold 1 and a second mold 2; the first mold 1 and the second mold 2 are distributed left and right and are used to extrude a plastic preform into the shape of a speedboat hull; it also includes a cooling mechanism, a vent pipe 5, a hollow tube 6, a reset mechanism, and a baffle 8; both the first mold 1 and the second mold 2 are equipped with cooling mechanisms, which are used to cool and shape the plastic preform; both the first mold 1 and the second mold 2 have L-shaped gas channels 4 on their inner sides; both the first mold 1 and the second mold 2 have vent pipes 5 on their tops, which are connected to the top openings of the gas channels 4; both the first mold 1 and the second mold 2 have hollow tubes 6 inside the gas channels 4; a reset mechanism is slidably installed inside the hollow tube 6, and a baffle 8 is connected to the reset mechanism. The baffle 8 is used to block the openings on the side of the gas channels 4, and the reset mechanism is used to drive the baffle 8 to reset. The side of the baffle 8 is curved, and the curved surface can shorten the moving distance compared to a flat surface to separate the baffle 8 from the first mold 1 and the second mold 2, thereby preventing the baffle 8 from moving excessively and causing extrusion on the surface of the speedboat hull.

[0026] See Figure 2 and Figure 3 As shown, the cooling mechanism includes an inlet pipe 303 and an outlet pipe 304; both the first mold 1 and the second mold 2 have cavities 301 on their inner sides, and both the first mold 1 and the second mold 2 have two liquid channels 302 on their inner sides. The two liquid channels 302 in the first mold 1 and the second mold 2 are distributed vertically and are connected to the cavities 301; both the first mold 1 and the second mold 2 have inlet pipes 303 and outlet pipes 304 installed on their front sides. The inlet pipe 303 is located below the outlet pipe 304 and is connected to the lower liquid channel 302, while the outlet pipe 304 is connected to the upper liquid channel 302.

[0027] See Figure 4 As shown, the reset mechanism includes a movable rod 701 and a spring 702; the movable rod 701 is slidably disposed inside the hollow tube 6, and the baffle 8 is connected to the end of the movable rod 701 away from the inner side of the hollow tube 6; the end of the movable rod 701 close to the inner side of the hollow tube 6 is connected to the inner side of the hollow tube 6 by the spring 702.

[0028] See Figure 1 and Figure 2 As shown, the first mold 1 and the second mold 2 are both provided with mounting holes 12 spaced apart, and the mounting holes 12 are used to install the first mold 1 and the second mold 2.

[0029] In use, firstly, bolts are inserted into the mounting holes 12 to install the first mold 1 and the second mold 2 in the designated positions. Then, the plastic preform for the speedboat hull is fed from top to bottom between the first mold 1 and the second mold 2 (the plastic preform is already inflated; subsequent molding only requires extrusion by the first mold 1 and the second mold 2). Next, the first mold 1 and the second mold 2 are brought closer together to close, allowing them to extrude the plastic preform. After extrusion molding, the outlet pipe 304 and the inlet pipe 303 are connected to the inlet and outlet of the cooling equipment, respectively, so that the cooling equipment continuously supplies coolant into the liquid channel 302 through the inlet pipe 303. This allows the coolant to enter the cavity 301 along the liquid channel 302, thereby carrying away the heat from the first mold 1 and the second mold 2. The first mold 1 and the second mold 2 then cool the plastic preform, thus cooling and shaping the speedboat hull. As the coolant continues to flow into the cavity 301, it is also discharged along the upper liquid channel 302 and the outlet pipe 304, returning to the cooling equipment for further cooling. This circulating cooling structure allows for continuous flow and heat exchange of the coolant within the mold, effectively removing the heat released by the plastic preform during molding, thus accelerating the cooling and shaping process and improving production efficiency. After the speedboat hull has completed cooling and shaping, the first mold 1 is then controlled to cool and shape the hull. Mold 1 and mold 2 are moved apart, causing them to open. Simultaneously, air is introduced into gas channel 4 through vent pipe 5, gradually increasing the air pressure. When the pressure of the air on baffle 8 exceeds the elastic force of spring 702, the air compresses baffle 8, moving it away from the inner side of gas channel 4. This causes movable rod 701 to move away from the inner side of gas channel 4, stretching spring 702 and gradually separating the curved surface of baffle 8 from the inner wall of gas channel 4. This allows baffle 8 to no longer block the side opening of gas channel 4, enabling air to flow between the speedboat hull and the mold through the side opening. This airflow between the speedboat hull and the mold allows for rapid air movement. A uniform airflow layer is formed between the speedboat hull and the mold wall, creating a tiny gap between them. This effectively reduces the adhesion and frictional resistance between the two. This airflow layer not only assists in demolding the speedboat hull but also avoids excessive pressure on the hull surface caused by traditional mechanical ejection mechanisms, achieving flexible demolding with uniform force. Finally, under the synergistic effect of air pressure, the molded speedboat hull can be smoothly and completely separated from the first mold 1 and the second mold 2, significantly improving demolding efficiency and product appearance quality. After the speedboat hull has been demolded, the air supply through the vent pipe 5 into the gas channel 4 is stopped, allowing the air pressure in the gas channel 4 to gradually return to normal. When the pressure of the air in the gas channel 4 on the baffle 8 is less than the elastic force of the spring 702,Spring 702 returns to its original position, causing the movable rod 701 and baffle 8 to move closer to the inner side of the gas channel 4, resetting the baffle 8 so that its curved surface re-contacts the inner wall of the gas channel 4 and blocks the side opening of the gas channel 4 again. Then, the speedboat hull is cut from the plastic preform fed in from above, and the excess material at the edges of the speedboat hull is cut away. This completes the blow molding and demolding process of the speedboat hull.

[0030] See Figure 2 and Figure 3 As shown, it also includes an electric push rod 9 and a cutting blade 10; the electric push rod 9 is installed in the middle of the bottom of the first mold 1; the cutting blade 10 is connected to the telescopic rod of the electric push rod 9, and the cutting blade 10 is used to cut the excess material on the edge of the speedboat hull.

[0031] See Figure 2 As shown, it also includes a touch switch 11; the touch switch 11 is installed on the upper right front part of the first mold 1, the touch switch 11 is used to contact the second mold 2, and the touch switch 11 is electrically connected to the electric push rod 9.

[0032] By setting up an electric push rod 9, a cutting blade 10, and a touch switch 11, when the first mold 1 and the second mold 2 approach each other, the first mold 1 will drive the touch switch 11 to gradually approach the second mold 2. When the first mold 1 and the second mold 2 complete the mold closing, the touch switch 11 will contact the second mold 2. At this time, the touch switch 11 will control the electric push rod 9 to drive the cutting blade 10 to move to the right, so that the cutting blade 10 moves closer to the edge of the speedboat hull until the cutting blade 10 cuts the edge of the speedboat hull, realizing the automatic discharge of air in the residual material, which is convenient for subsequent manual processing of the residual material and avoids safety hazards such as bulging, bouncing or sudden breakage caused by residual air in the internal sealed cavity during subsequent manual processing of the residual material. When the first mold 1 and the second mold 2 move away from each other, the first mold 1 will drive the touch switch 11 to gradually move away from the second mold 2. When the touch switch 11 separates from the second mold 2, the touch switch 11 will control the electric push rod 9 to drive the cutting blade 10 to move to the left to reset.

[0033] See Figure 1 , Figure 2 and Figure 5 As shown, it also includes a hollow frame 13; the top of the first mold 1 and the second mold 2 are both provided with hollow frames 13, and the lower part of the two hollow frames 13 on the side that is close to each other is provided with a slope, and the two slopes are in contact to cut off the excess material at the edge of the speedboat hull.

[0034] See Figure 5 and Figure 6As shown, it also includes an inlet pipe 14 and an outlet pipe 15; the inlet pipe 14 is installed on the rear top side of the hollow frame 13, and the inlet pipe 14 is used to add coolant into the hollow frame 13; the outlet pipe 15 is installed on the front top side of the hollow frame 13, and the outlet pipe 15 is used to discharge the coolant from the hollow frame 13.

[0035] See Figure 6 As shown, it also includes guide cylinders 16, sliding rods 17, and magnetic strips 18; two sets of guide cylinders 16 are installed inside the hollow frame 13, the two sets of guide cylinders 16 are distributed vertically, and there are three guide cylinders 16 in one set, and the three guide cylinders 16 in the same set are distributed in front, middle and back; a sliding rod 17 is slidably arranged inside the guide cylinder 16, and the end of the sliding rod 17 is a disc-shaped structure. Magnetic strips 18 are connected between the sliding rods 17 in the three guide cylinders 16 in the same set, and the magnetic strips 18 are used to hold the plastic preform.

[0036] By setting up a hollow frame 13, an inlet pipe 14, an outlet pipe 15, a guide cylinder 16, a sliding rod 17, and a magnetic strip 18, in use, the inlet and outlet of another cooling device can be connected to the outlet pipe 15 and the inlet pipe 14 respectively. Then, the cooling device sends cold water into the hollow frame 13 through the inlet pipe 14, allowing the cold water to carry away the heat from the hollow frame 13. Then, the water in the hollow frame 13 is discharged back into the cooling device through the outlet pipe 15, thus realizing water circulation. When the first mold 1 and the second mold 2 are in use... When the molds move closer together, the hollow frames 13 at the top of the first mold 1 and the second mold 2 will also move closer together, thereby causing the guide cylinders 16 on the left and right sides to move closer together. When the inner wall of the guide cylinder 16 contacts the disc-shaped structure at the end of the sliding rod 17, the guide cylinder 16 will cause the sliding rods 17 and the magnetic strips 18 on the left and right sides to move closer together. When the first mold 1 and the second mold 2 are closed, the hollow frames 13 and the magnetic strips 18 will adhere to the side of the plastic blank fed in from above, allowing the hollow frames 13 to cool the plastic blank, so that the plastic blank can be separated from the hollow frames 13 and the magnetic strips 18 later. At the same time, the inclined surfaces of the two hollow frames 13 will also contact each other, thereby cutting the speedboat hull from the plastic blank fed in from above, thus automatically separating the speedboat hull from the plastic blank fed in from above. At the same time, the magnetic strips 18 on the left and right sides will adhere tightly to the side of the plastic blank fed in from above due to magnetic attraction. When the first mold 1 and the second mold 2 move away from each other, the hollow frames 13 at the top of the first mold 1 and the second mold 2 will also move closer together. The guide cylinders 16 on both sides move away from each other, causing the inner wall of the guide cylinder 16 to separate from the end of the sliding rod 17. The magnetic strip 18 will be attracted by the magnetic force and abut against the side of the plastic blank, thereby limiting the position by abutting against the plastic blank, so as to facilitate the separation of the hollow frame 13 from the plastic blank. When the disc-shaped structure at the end of the sliding rod 17 contacts the inner wall of the hollow frame 13, the guide cylinder 16 will cause the left and right sliding rods 17 and the magnetic strip 18 to move away from each other, causing the magnetic strip 18 to separate from the plastic blank.

[0037] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A blow molding mold for a speedboat hull that facilitates demolding, comprising a first mold (1) and a second mold (2), wherein the first mold (1) and the second mold (2) are used to extrude a plastic preform into the shape of a speedboat hull, characterized in that, It also includes a cooling mechanism, a vent pipe (5), a hollow tube (6), a reset mechanism, and a baffle (8). The first mold (1) and the second mold (2) are both equipped with a cooling mechanism, which is used to cool and shape the plastic preform. The first mold (1) and the second mold (2) are both provided with a gas channel (4). The first mold (1) and the second mold (2) are both provided with a vent pipe (5), which is connected to the gas channel (4). The gas channel (4) in the first mold (1) and the second mold (2) is provided with a hollow tube (6). The reset mechanism is slidably provided in the hollow tube (6). The reset mechanism is connected with a baffle (8), which is used to block the opening of the gas channel (4). The reset mechanism is used to drive the baffle (8) to reset.

2. The blow molding mold for a speedboat hull that facilitates demolding according to claim 1, characterized in that, The side of the baffle (8) is set as a curved surface, which is conducive to the separation of the baffle (8) from the first mold (1) and the second mold (2).

3. The blow molding mold for a speedboat hull that facilitates demolding according to claim 1, characterized in that, The cooling mechanism includes an inlet pipe (303) and an outlet pipe (304). Both the first mold (1) and the second mold (2) have cavities (301) and two liquid channels (302) respectively. The liquid channels (302) are connected to the cavities (301). The first mold (1) and the second mold (2) are equipped with inlet pipes (303) and outlet pipes (304) on their sides. The inlet pipes (303) and outlet pipes (304) are connected to the two liquid channels (302) respectively.

4. The blow molding mold for a speedboat hull that facilitates demolding according to claim 1, characterized in that, The reset mechanism includes a movable rod (701) and a spring (702). The movable rod (701) is slidably disposed inside the hollow tube (6). A baffle (8) is connected to the end of the movable rod (701). The other end of the movable rod (701) is connected to the inner side of the hollow tube (6) by a spring (702).

5. The blow molding mold for a speedboat hull that facilitates demolding according to claim 1, characterized in that, It also includes an electric push rod (9) and a cutting blade (10). The electric push rod (9) is installed at the bottom of the first mold (1). The cutting blade (10) is connected to the telescopic rod of the electric push rod (9). The cutting blade (10) is used to cut the excess material on the edge of the speedboat hull.

6. The blow molding mold for a speedboat hull that facilitates demolding according to claim 5, characterized in that, It also includes a touch switch (11), which is installed on the first mold (1). The touch switch (11) is used to contact the second mold (2), and the touch switch (11) is electrically connected to the electric push rod (9).

7. The blow molding mold for a speedboat hull that facilitates demolding according to claim 1, characterized in that, The first mold (1) and the second mold (2) are provided with mounting holes (12) spaced apart, which are used to install the first mold (1) and the second mold (2).

8. The blow molding mold for a speedboat hull that facilitates demolding according to claim 1, characterized in that, It also includes a hollow frame (13). The top of the first mold (1) and the second mold (2) are both provided with a hollow frame (13). The two hollow frames (13) are provided with inclined surfaces on the side that are close to each other. The two inclined surfaces are in contact to cut off the excess material at the edge of the speedboat hull.

9. A blow molding mold for a speedboat hull that facilitates demolding, as described in claim 8, is characterized in that, It also includes an inlet pipe (14) and an outlet pipe (15). The inlet pipe (14) and the outlet pipe (15) are installed on the hollow frame (13). The inlet pipe (14) is used to add coolant into the hollow frame (13), and the outlet pipe (15) is used to discharge the coolant from the hollow frame (13).

10. A blow molding mold for a speedboat hull that facilitates demolding, as described in claim 8, characterized in that, It also includes a guide cylinder (16), a sliding rod (17) and a magnetic strip (18). The guide cylinder (16) is installed at intervals inside the hollow frame (13). The sliding rod (17) is slidably arranged on the guide cylinder (16). The magnetic strip (18) is connected to the sliding rod (17). The magnetic strip (18) is used to hold the plastic preform.

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