Plastic Injection Molding Die for Electric Bicycle Stem Tube

Abstract

The injection molding die for an electric vehicle handlebar tube includes a cavity compound plate and a cavity frame, as well as a core compound plate, die feet, ejector pin bottom plate, ejector pin panel and core plate. A lower tube core insert is arranged on the core plate. A submarine gate and a hot nozzle hole are arranged on the lower tube core insert. A hot nozzle is connected to the core compound plate and the hot nozzle extends into the hot nozzle hole. A straight ejector guide hole and an internal undercut cavity are also arranged on the lower tube core insert. A straight ejector block is connected to the ejector pin panel and the straight ejector block extends into the straight ejector guide hole and cooperates with the internal undercut cavity. An upper tube core is connected under the cavity compound plate and the upper tube core passes through the cavity frame and is inserted opposite to the straight ejector block and the lower tube core insert. Two half slider blocks are also arranged horizontally on the core plate. The two half slider blocks surround the lower tube core insert and cooperate with the cavity frame, and together with the lower tube core insert, the straight ejector block and the upper tube core form a handlebar tube cavity. The handlebar tube cavity is communicated with the internal undercut cavity. The handlebar tube is injection molded in the handlebar tube cavity and the internal undercut is injection molded in the internal undercut cavity.

Description

Technical Field

[0001] The present invention relates to an injection molding die for an electric vehicle handlebar tube, belonging to the field of injection molds. Background Art

[0002] When using an injection mold to produce plastic products, such as products like the handlebar tube of an electric vehicle, according to the analysis of the product shape and structure, the upper part of the handlebar tube is connected to the handlebar, and the lower part is connected to the front wheel fork. The overall volume of the handlebar tube is small, but the internal structure is relatively complex, with many buckles and assembly holes. In particular, the upper tube of the handlebar tube is small, the lower tube is large, and a spacer is provided between the upper tube and the lower tube, making it impossible to directly demold the handlebar tube after molding. Therefore, the traditional technology for processing the handlebar tube generally adopts a split method, that is, the handlebar tube is divided into two parts and processed and molded separately, and then assembled together. During production, two sets of molds need to be developed, which not only increases the cost investment but also requires manual assembly, resulting in low efficiency. At the same time, there is a splicing seam in the product assembly. Since the handlebar tube is an exterior part of the electric vehicle, having a splicing seam makes the appearance not beautiful. Therefore, the applicant of the present invention has developed an injection molding die for an integrally molded electric vehicle handlebar tube. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an injection molding die for an electric vehicle handlebar tube that adopts butt joint assembly, integrally molded, secondary mold opening, and smooth demolding.

[0004] The technical solution of the injection molding die for the electric vehicle handlebar tube of the present invention is as follows: It includes a cavity composite plate and a core composite plate. A cavity frame is arranged under the cavity composite plate. Two die feet are arranged on the core composite plate. A thimble bottom plate and a thimble panel are arranged between the two die feet. A core plate is arranged on the two die feet. It is characterized in that: a lower tube core insert is arranged on the core plate. A submarine gate and a hot nozzle hole are arranged on the lower tube core insert. An injection port is arranged on the core composite plate. A hot nozzle is connected to the injection port. The hot nozzle extends into the hot nozzle hole and cooperates with the submarine gate. A straight ejector guide hole and an internal undercut cavity are also arranged on the lower tube core insert. A straight ejector rod is connected to the thimble panel. A straight ejector block is arranged on the straight ejector rod. The straight ejector block extends into the straight ejector guide hole and cooperates with the internal undercut cavity. An upper tube core is connected under the cavity composite plate. The upper tube core passes through the cavity frame and is inserted opposite to the straight ejector block and the lower tube core insert;

[0005] Two half slider blocks are also horizontally arranged on the core plate. The two half slider blocks surround the lower tube core insert and cooperate with the cavity frame, forming a handlebar tube mold cavity with the lower tube core insert, the straight ejector block, and the upper tube core. The handlebar tube mold cavity is communicated with the internal undercut cavity. The handlebar tube is injection molded in the handlebar tube mold cavity, and the internal undercut is injection molded in the internal undercut cavity;

[0006] The two half slider blocks are driven to slide outward by an external sliding mechanism. A secondary mold opening mechanism is arranged between the outer walls of the cavity composite plate, the cavity frame, and the core plate.

[0007] The outer sliding mechanism includes outer sliding oil cylinders arranged on both sides of the core plate. Connecting lock modules are arranged on the outer walls of the two half sliders. The connecting lock modules cooperate with the cavity frame and are connected to the outer sliding oil cylinders.

[0008] The secondary mold opening mechanism includes a pressure rod connected to the outer wall of the cavity composite plate, with a pressure block formed on the pressure rod. A pull rod is connected to the outer wall of the core plate, with a hook formed on the pull rod. A spring and a latch block are arranged in the outer wall of the cavity frame. The head of the latch block extends outside the cavity frame wall. Its upper vertex angle cooperates with the hook, and its lower base angle is made into an inclined surface, which cooperates with the pressure block.

[0009] The injection molding die for the electric vehicle handlebar upright tube of the present invention has the following beneficial effects:

[0010] 1. Through the insertion and assembly of the upper tube core, the direct top block, and the lower tube core insert block, the core of the mold is formed. Then, through the cooperation of the two half sliders and the cavity frame, the cavity of the mold is formed. The core and the cavity cooperate to form the mold cavity, realizing the integral injection molding of the handlebar upright tube. The product does not require assembly, which can reduce mold investment and labor costs, saving costs.

[0011] 2. The reverse injection structure is adopted, that is, the hot nozzle is connected to the core composite plate, and the plastic is injected into the mold cavity from the submarine gate of the lower tube core insert block, realizing the injection from the inner wall of the back of the product, making the surface of the product free of glue marks and ensuring the smoothness of the product surface.

[0012] 3. The secondary mold opening and outer sliding demolding structure is adopted, combined with the direct top demolding, so that the upper tube of the handlebar upright tube is first ejected, then the outer contour of the handlebar upright tube is ejected, and finally the handlebar upright tube is directly lifted by the direct top block, which is convenient for manual or manipulator to take away, and the demolding action is smooth. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the injection molding die for the electric vehicle handlebar upright tube of the present invention;

[0014] Figure 2 is Figure 1 the schematic A - A cross-sectional view of

[0015] Figure 3 is a three-dimensional schematic diagram of the injection molding die for the electric vehicle handlebar upright tube of the present invention;

[0016] Figure 4 is a three-dimensional sectional schematic diagram of the insertion and assembly of the upper tube core, the lower tube core insert block, and the direct top block of the present invention;

[0017] Figure 5 is a schematic structural diagram of the secondary mold opening mechanism of the present invention. Embodiment

[0018] The present invention relates to an injection molding die for an electric vehicle handlebar tube, as Figure 1 — Figure 5 shown, which includes a cavity compound plate 1 and a core compound plate 2. A cavity frame 3 is arranged under the cavity compound plate, and two die feet 5 are arranged on the core compound plate. A thimble bottom plate 6 and a thimble panel 7 are arranged between the two die feet. A core plate 8 is arranged on the two die feet. Among them, a lower tube core insert 9 is arranged on the core plate 8. A submarine gate 10 and a hot nozzle hole 11 are arranged on the lower tube core insert 9. An injection port 12 is arranged on the core compound plate 2. A hot nozzle 13 is connected to the injection port. The hot nozzle 13 extends into the hot nozzle hole 11 and cooperates with the submarine gate 10. A straight thimble guide hole 15 and an internal undercut cavity 16 are also arranged on the lower tube core insert 9. A straight thimble rod 17 is connected to the thimble panel 7. A straight thimble block 18 is arranged on the straight thimble rod. The straight thimble block extends into the straight thimble guide hole 15 and cooperates with the internal undercut cavity 16. An upper tube core 19 is connected under the cavity compound plate 1. The upper tube core 19 passes through the cavity frame 3 and is inserted opposite to the straight thimble block 18 and the lower tube core insert 9;

[0019] Two half slider blocks 20 are also horizontally arranged on the core plate 8. The two half slider blocks 20 surround the lower tube core insert 9 and cooperate with the cavity frame 3. Together with the lower tube core insert 9, the straight thimble block 18 and the upper tube core 19, they form a handlebar tube die cavity. The handlebar tube die cavity is communicated with the internal undercut cavity 16. A handlebar tube 21 is injection molded in the handlebar tube die cavity, and an internal undercut 22 is injection molded in the internal undercut cavity 16;

[0020] The two half slider blocks 20 are driven to slide outward by an external sliding mechanism. A secondary mold opening mechanism is arranged between the outer walls of the cavity compound plate 1, the cavity frame 3 and the core plate 8;

[0021] The external sliding mechanism includes arranging external sliding oil cylinders 25 on both sides of the core plate 8. Connecting lock modules 26 are arranged on the outer walls of the two half slider blocks 20. The connecting lock modules 26 cooperate with the cavity frame 3 and are connected to the external sliding oil cylinders 25.

[0022] The secondary mold opening mechanism includes connecting a pressure rod 30 to the outer wall of the cavity compound plate 1. A pressure block 31 is made on the pressure rod. A pull rod 32 is connected to the outer wall of the core plate 8. A hook 33 is made on the pull rod. A spring 35 and a latch block 36 are arranged in the outer wall of the cavity frame 3. The head of the latch block 36 extends out of the cavity frame wall. Its upper top angle cooperates with the hook 33, and its lower bottom angle is made into an inclined surface 37. The inclined surface 37 cooperates with the pressure block 31.

[0023] The main feature of the present invention is that a lower cylinder core insert 9 is provided on the core plate 8, and an internal undercut cavity 16 is provided on the lower cylinder core insert 9. A straight ejector rod 17 is connected to the ejector pin plate 7, and a straight ejector block 18 is provided on the straight ejector rod. The straight ejector block extends into the straight ejector guide hole 15 and cooperates with the internal undercut cavity 16. The cavity compound plate 1 is connected to an upper cylinder core 19 below. The upper cylinder core 19 passes through the cavity frame 3 and is inserted opposite to the straight ejector block 18 and the lower cylinder core insert 9, that is, the upper cylinder core 19, the lower cylinder core insert 9 and the straight ejector block 18 are inserted up and down and opposite to form the core of the mold. Two half slider blocks 20 cooperate with the cavity frame 3 to form the cavity of the mold. The cavity and the core cooperate to form a vertical cylinder cavity. And a submarine gate 10 and a nozzle hole 11 are also provided in the lower cylinder core insert 9. A nozzle 13 is connected to the core compound plate 2. The nozzle 13 extends into the nozzle hole 11. During injection molding, the plastic raw material enters from the nozzle 13 and is injected into the vertical cylinder cavity and the internal undercut cavity 16 through the submarine gate 10, forming a vertical cylinder 21 and an internal undercut 22, so that the vertical cylinder is integrally injection molded. And in traditional molds, the nozzle is connected under the cavity compound plate. In this solution, the nozzle 13 is connected to the core compound plate 12 and then injected through the submarine gate, realizing the injection of the product from the inner wall of the back, making the surface of the product without gate marks and the appearance smooth and beautiful.

[0024] During demolding, first, the core plate 8 and the cavity frame 3 are separated from the mold by the power of the injection molding machine. However, under the action of the secondary demolding mechanism, the hook 33 pulls the upper vertex angle of the block 36, so that the cavity frame 3 first opens the mold together with the core plate 8, that is, the cavity frame 3 is separated from the cavity compound plate 1. Since the upper cylinder core 19 is connected to the cavity compound plate 1 and cannot move, when the cavity frame moves, it is equivalent to the upper cylinder core 19 being pulled out from the lower cylinder core insert 9 and the straight ejector block 18, completing the demolding of the upper cylinder of the vertical cylinder. Then continue to open the mold for a certain distance. At this time, the inclined surface 37 of the block 36 contacts the pressure block 31. Under the action of the pressure block, the block 36 is pressed inward, the spring 35 is compressed, and the block 36 retracts into the cavity frame 3 and disengages from the hook 33. Continue to open the mold, the cavity frame 3 is separated from the core plate 8, and then the outer sliding mechanism works. The two half slider blocks 20 are driven by the outer sliding oil cylinder 25 to slide outward, completing the demolding of the outer contour surface of the vertical cylinder. At this time, there is still the lower cylinder of the vertical cylinder left on the lower cylinder core insert 9 and the straight ejector block 18. The ejector pin bottom plate 6 and the ejector pin plate 7 are driven by the power. The ejector pin plate 7 drives the straight ejector rod 17 to move upward. The straight ejector rod 17 jacks up the vertical cylinder 21 from the lower cylinder core insert 9 through the straight ejector block 18. Finally, the vertical cylinder 21 is taken away from the straight ejector block by manual or manipulator, and the product demolding is completed.

[0025] The beneficial effects of this solution are:

[0026] 1. By inserting and assembling the upper core with the straight top block and the lower core insert of the cylinder, the core of the mold is formed. Then, through the cooperation of two half sliders and the cavity frame, the cavity of the mold is formed. The core and the cavity cooperate to form the mold cavity, realizing the integral injection molding of the vertical cylinder. The product does not require assembly, which can reduce mold investment and labor costs and save costs;

[0027] 2. The reverse gating structure is adopted, that is, the hot nozzle is connected to the core backing plate, and the plastic is injected into the mold cavity through the submarine gate of the lower core insert of the cylinder, realizing the gating on the inner wall of the back of the product, making the surface of the product free of gate marks and ensuring the smoothness of the product surface;

[0028] 3. The secondary mold opening and external slide demolding structure are adopted, combined with the straight top demolding, so that the upper cylinder of the vertical cylinder is first demolded, then the outer contour of the vertical cylinder is demolded, and finally the vertical cylinder is directly lifted by the straight top block, which is convenient for manual or robotic arm to take away, and the demolding action is smooth.

Claims

1. Injection molding die for electric vehicle handlebar tube, including a cavity composite plate (1) and a core composite plate (2). A cavity frame (3) is arranged under the cavity composite plate. Two mold feet (5) are arranged on the core composite plate. A thimble bottom plate (6) and a thimble panel (7) are arranged between the two mold feet. A core plate (8) is arranged on the two mold feet. It is characterized in that: A lower tube core insert (9) is arranged on the core plate (8). A submarine gate (10) and a hot nozzle hole (11) are arranged on the lower tube core insert (9). An injection port (12) is arranged on the core composite plate (2). A hot nozzle (13) is connected to the injection port. The hot nozzle (13) extends into the hot nozzle hole (11) and cooperates with the submarine gate (10). A direct ejector guide hole (15) and an internal undercut cavity (16) are also arranged on the lower tube core insert (9). A direct ejector rod (17) is connected to the thimble panel (7). A direct ejector block (18) is arranged on the direct ejector rod. The direct ejector block extends into the direct ejector guide hole (15) and cooperates with the internal undercut cavity (16). An upper tube core (19) is connected under the cavity composite plate (1). The upper tube core (19) passes through the cavity frame (3) and is inserted opposite to the direct ejector block (18) and the lower tube core insert (9). Two half slider blocks (20) are also horizontally arranged on the core plate (8). The two half slider blocks (20) surround the lower tube core insert (9) and cooperate with the cavity frame (3) to form a handlebar tube mold cavity between the lower tube core insert (9), the direct ejector block (18) and the upper tube core (19). The handlebar tube mold cavity is communicated with the internal undercut cavity (16). A handlebar tube (21) is injection molded in the handlebar tube mold cavity, and an internal undercut (22) is injection molded in the internal undercut cavity (16). The two half slider blocks (20) are driven to slide outward by an external sliding mechanism. A secondary mold opening mechanism is arranged between the outer walls of the cavity composite plate (1), the cavity frame (3) and the core plate (8). The external sliding mechanism includes an external sliding oil cylinder (25) arranged on each side of the core plate (8). A connecting lock module (26) is arranged on the outer wall of each of the two half slider blocks (20). The connecting lock module (26) cooperates with the cavity frame (3) and is connected to the external sliding oil cylinder (25). The secondary mold opening mechanism includes a pressure rod (30) connected to the outer wall of the cavity composite plate (1). A pressure block (31) is made on the pressure rod. A pull rod (32) is connected to the outer wall of the core plate (8). A hook (33) is made on the pull rod. A spring (35) and a latch block (36) are arranged in the outer wall of the cavity frame (3). The head of the latch block (36) extends out of the cavity frame wall. Its upper vertex angle cooperates with the hook (33), and its lower bottom angle is made into an inclined surface (37). The inclined surface (37) cooperates with the pressure block (31).

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