Forming die for automobile oil filler pipe

Abstract

The utility model relates to a forming die for an automobile oil filler pipe. The forming die comprises a feeding plate, a seat plate, a movable die block, a fixed die block, a forming device and an ejection mechanism, wherein the feeding plate and the seat plate are respectively arranged front and back; the movable die block and the fixed die block are respectively fixed on the rear side of the feeding plate and the front side of the seat plate and are matched with each other; the forming device comprises a two-stage forming unit and a single-stage forming unit which are respectively arranged up and down; the two-stage forming unit comprises a first-stage movable mold core embedded in the rear side of the movable mold block, a second-stage movable mold core fixed on the end surface of the first-stage movable mold core, and a first fixed mold core embedded in the front side of the fixed mold block and matched with the second-stage movable mold core; according to the utility model, the production steps are greatly simplified, so that the production efficiency is effectively improved; and meanwhile, the manufacturing cost of the mold is greatly reduced, so that the production cost is remarkably reduced.

Description

Technical Field

[0001] This utility model relates to a molding die for an automobile fuel filler nozzle. Background Technology

[0002] The fuel filler hose is the pipe that connects the fuel filler neck to the fuel tank. Its main function is to safely and smoothly transfer fuel from the fuel filler neck to the fuel tank. The fuel filler hose generally consists of two parts: an interface and a cover. In order to have a certain degree of flexibility and oil resistance, and to ensure that it can work normally under various operating conditions, both the interface and the cover of the fuel filler hose are made of plastic.

[0003] Since both the interface and the cover of the fuel filler pipe are made of plastic, their production process relies on a matching injection mold and an injection molding machine. Currently, the internal and external structures of the interface of the fuel filler pipe are quite complex. Traditional single-stage molding methods cannot mold its internal structure in one step; instead, it must be done in two steps, i.e., two injection molding processes. Therefore, the production process is cumbersome, leading to low production efficiency. Furthermore, the cover of the fuel filler pipe also requires a separate injection mold for molding, resulting in a total of three molds being made. This leads to high mold manufacturing costs and consequently, high production costs, requiring further improvement. Utility Model Content

[0004] In view of the current state of the prior art, the technical problem to be solved by this utility model is to provide a molding die for an automobile fuel filler pipe that greatly simplifies the production steps to effectively improve production efficiency, while greatly reducing the mold manufacturing cost to significantly reduce production costs.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: a molding die for an automobile fuel filler pipe, comprising a feed plate and a base plate respectively arranged front and rear, a moving module and a fixed module respectively fixed to the rear side of the feed plate and the front side of the base plate and cooperating with each other, a molding device disposed between the moving module and the fixed module, and an ejection mechanism disposed between the fixed module and the base plate, characterized in that:

[0006] The molding device includes a two-stage molding unit and a single-stage molding unit respectively arranged vertically. The two-stage molding unit includes a first-stage moving mold core embedded in the rear side of the moving module, a second-stage moving mold core fixed on the end face of the first-stage moving mold core, and a first-stage fixed mold core embedded in the front side of the fixed module and cooperating with the second-stage moving mold core.

[0007] The single-stage molding unit includes a single-stage moving mold core embedded inside the rear side of the moving module, and a single-stage fixed mold core embedded inside the front side of the fixed module and cooperating with the single-stage moving mold core.

[0008] A first active core-pulling assembly is also provided between the primary moving mold core and the moving module. The first active core-pulling assembly includes a first core-pulling cylinder fixed on the right outer wall of the primary moving mold core, a traction block movably connected to the bottom outer wall of the primary moving mold core to have left and right translation function, and a forming column movably and obliquely inserted in the primary moving mold core. The telescopic end of the first core-pulling cylinder is arranged parallel to the moving direction of the traction block and fixed on the traction block.

[0009] A straight section is formed outward on the side of the traction block near the forming column. An inclined traction section is formed at the end of the straight section. A limiting block is formed outward at the front end of the forming column. A pressure block is fixed at the end of the limiting block. A first guide groove and a second guide groove that cooperate with each other are respectively opened on the outer wall of the pressure block and the limiting block. The traction section and the straight section are movably inserted between the first guide groove and the second guide groove.

[0010] Preferably, two second active core-pulling assemblies are further provided between the primary moving mold core and the secondary moving mold core, which are diagonally distributed. The second active core-pulling assembly includes a drive block movably connected between the adjacent outer walls of the primary moving mold core and the secondary moving mold core to have a linear movement function, a second core-pulling cylinder fixed on the outer wall of the secondary moving mold core, and a first locking block and a second locking block fixed on the drive block and arranged front and back. The telescopic end of the second core-pulling cylinder is arranged parallel to the movement direction of the drive block and fixed on the drive block.

[0011] Preferably, the ends of the first card block and the second card block are respectively provided with a first arc-shaped groove and a second arc-shaped groove distributed concentrically. The inner walls of the first arc-shaped groove and the second arc-shaped groove are mutually engaged with the outer peripheral surface of the forming column. A conical boss is formed outward from the center of the rear end of the forming column.

[0012] Preferably, a forming protrusion is formed on the end face of the first fixed mold core in the direction of the secondary moving mold core. Correspondingly, a positioning cavity that cooperates with the forming protrusion is opened on the end face of the secondary moving mold core. A first cavity hole is opened on the bottom surface of the positioning cavity. The rear end of the forming column passes through the first cavity hole and extends into the interior of the positioning cavity. A stepped groove is opened on one side of the end face of the forming protrusion.

[0013] Preferably, the single-stage molding unit further includes two first passive core-pulling components arranged symmetrically on the left and right, two second passive core-pulling components arranged symmetrically on the left and right and respectively located below the two first passive core-pulling components, two third passive core-pulling components arranged symmetrically on the left and right and respectively located below the two second passive core-pulling components, a fourth passive core-pulling component disposed between the two third passive core-pulling components, and a fifth passive core-pulling component disposed below the fourth passive core-pulling component.

[0014] Preferably, a boss is formed on the end face of the single-stage fixed mold core in the direction of the single-stage moving mold core. Correspondingly, a molding cavity that cooperates with the boss is opened on the end face of the single-stage moving mold core. A molding notch is opened on the upper edge of the end of the boss, and a second cavity hole is opened on the bottom surface of the molding cavity.

[0015] Preferably, the fourth passive core-pulling assembly includes a fourth slider movably connected in the molding notch to have the function of vertical movement up and down, and a fourth pull rod obliquely inserted in the fourth slider. The front end of the fourth pull rod passes through the second cavity and is fixed on the moving module. A fourth side molding block is formed on the outer wall of the fourth slider near the single-stage fixed mold core in the direction of the single-stage fixed mold core.

[0016] Compared with the prior art, the advantages of this utility model are as follows: This utility model adopts a two-stage mold splitting method, which allows the inner and outer structures of the interface part of the fuel filler pipe to be formed simultaneously in one injection molding process, eliminating the need for two separate steps, thus greatly simplifying the production process and effectively improving production efficiency; at the same time, the cover part of the fuel filler pipe is also integrated into the same injection mold, so only one mold is needed to complete the injection molding of both parts of the fuel filler pipe, thereby greatly reducing the mold manufacturing cost and significantly reducing production costs. Attached Figure Description

[0017] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent when taken in conjunction with the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings:

[0018] Figure 1 This is an exploded view of the right front side of this utility model;

[0019] Figure 2 This is an exploded view of the right rear side of the first active core-pulling assembly of this utility model.

[0020] Figure 3 This is a structural diagram of the right rear side of the first and second card blocks of this utility model;

[0021] Figure 4 This is a structural diagram of the right front side of the first fixed mold core and the single-stage fixed mold core of this utility model;

[0022] Figure 5 This is a structural diagram of the right rear side of the secondary moving mold core of this utility model;

[0023] Figure 6 This is a structural diagram of the right front side of the first passive core-pulling assembly and the second passive core-pulling assembly of this utility model;

[0024] Figure 7 This is a structural diagram of the right front side of the third passive core-pulling assembly of this utility model;

[0025] Figure 8 This is a structural diagram of the right front side of the fourth passive core-pulling assembly of this utility model;

[0026] Figure 9 This is a structural diagram of the right front side of the fifth passive core-pulling assembly of this utility model;

[0027] Figure 10 This is a top view of the right rear side of the single-stage moving mold core of this utility model. Detailed Implementation

[0028] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted.

[0030] like Figures 1-10 As shown, a molding die for an automobile fuel filler pipe includes a feed plate 3 and a seat plate 4 respectively arranged at the front and rear, a moving module 1 and a fixed module 2 respectively fixed to the rear side of the feed plate 3 and the front side of the seat plate 4 and cooperating with each other, a molding device 6 disposed between the moving module 1 and the fixed module 2, and an ejection mechanism 5 disposed between the fixed module 2 and the seat plate 4.

[0031] The molding device 6 includes a two-stage molding unit and a single-stage molding unit respectively arranged vertically. The two-stage molding unit includes a first-stage moving mold core 61 embedded in the rear side of the moving module 1, a second-stage moving mold core 62 fixed on the end face of the first-stage moving mold core 61, and a first fixed mold core 65 embedded in the front side of the fixed module 2 and cooperating with the second-stage moving mold core 62.

[0032] The single-stage molding unit includes a single-stage moving mold core 67 embedded inside the rear side of the moving module 1, and a single-stage fixed mold core 68 embedded inside the front side of the fixed module 2 and cooperating with the single-stage moving mold core 67.

[0033] A first active core-pulling assembly 64 is also provided between the first-stage moving mold core 61 and the moving module 1. The first active core-pulling assembly 64 includes a first core-pulling cylinder 641 fixed on the right outer wall of the first-stage moving mold core 61, a traction block 642 movably connected to the bottom outer wall of the first-stage moving mold core 61 to have left and right translation function, and a forming column 643 movably and obliquely inserted in the first-stage moving mold core 61. The telescopic end of the first core-pulling cylinder 641 is arranged parallel to the moving direction of the traction block 642 and fixed on the traction block 642.

[0034] A straight section 6421 is formed outward on the side of the traction block 642 near the forming column 643. The end of the straight section 6421 forms an inclined traction section 6422. A limiting block 6431 is formed outward at the front end of the forming column 643. A pressure block 644 is fixed at the end of the limiting block 6431. A first guide groove 6441 and a second guide groove 6432 that cooperate with each other are respectively opened on the outer wall of the pressure block 644 and the limiting block 6431. The traction section 6422 and the straight section 6421 are movably inserted between the first guide groove 6441 and the second guide groove 6432.

[0035] Two second active core-pulling assemblies 63 are also provided between the primary moving mold core 61 and the secondary moving mold core 62, which are diagonally distributed. The second active core-pulling assembly 63 includes a drive block 632 that is movably connected between the outer walls of the primary moving mold core 61 and the secondary moving mold core 62 to enable linear movement, a second core-pulling cylinder 631 fixed on the outer wall of the secondary moving mold core 62, and a first locking block 633 and a second locking block 634 fixed on the drive block 632 and arranged front and rear. The telescopic end of the second core-pulling cylinder 631 is arranged parallel to the moving direction of the drive block 632 and fixed on the drive block 632.

[0036] The ends of the first locking block 633 and the second locking block 634 are respectively provided with concentrically distributed first arc-shaped grooves 6331 and second arc-shaped grooves 6341. The inner walls of the first arc-shaped grooves 6331 and the second arc-shaped grooves 6341 are mutually engaged with the outer peripheral surface of the forming column 643. A conical boss 6341 is formed outward from the center of the rear end of the forming column 643.

[0037] A forming protrusion 651 is formed on the end face of the first fixed mold core 65 in the direction of the secondary moving mold core 62. Correspondingly, a positioning cavity 621 that cooperates with the forming protrusion 651 is opened on the end face of the secondary moving mold core 62. A first cavity hole 622 is opened on the bottom surface of the positioning cavity 621. The rear end of the forming post 643 passes through the first cavity hole 622 and extends into the interior of the positioning cavity 621. A stepped groove 652 is opened on one side of the end face of the forming protrusion 651.

[0038] The single-stage molding unit also includes two first passive core-pulling components 69 arranged symmetrically on the left and right, two second passive core-pulling components 610 arranged symmetrically on the left and right and located below the two first passive core-pulling components 69 respectively, two third passive core-pulling components 611 arranged symmetrically on the left and right and located below the two second passive core-pulling components 610 respectively, a fourth passive core-pulling component 612 disposed between the two third passive core-pulling components 611, and a fifth passive core-pulling component 613 disposed below the fourth passive core-pulling component 612.

[0039] The first passive core-pulling assembly 69 includes a first slider 691 movably connected to the front of the fixed module 2 to have left and right translation function, a first pull rod 692 obliquely inserted into the first slider 691, and a first side molding block 693 fixed on the first slider 691 near the single-stage fixed mold core 68. The front end of the first pull rod 692 is fixed on the moving module 1.

[0040] The second passive core-pulling assembly 610 includes a second slider 6101 movably connected to the front side of the fixed module 2 to have left and right translation function, a second pull rod 6102 obliquely inserted into the second slider 6101, a second side molding block 6103 fixed on the second slider 6101 near the single-stage fixed mold core 68, and a first core block 6104 embedded at the end of the second side molding block 6103. The front end of the second pull rod 6102 is fixed on the moving module 1.

[0041] The third passive core-pulling assembly 611 includes a third slider 6111 movably connected to the front of the fixed module 2 to have left and right translation function, a third pull rod 6112 obliquely inserted into the third slider 6111, a third side molding block 6113 fixed on the third slider 6111 near the single-stage fixed mold core 68, and a second core block 6114 embedded at the end of the third side molding block 6113. The front end of the third pull rod 6112 is fixed on the moving module 1.

[0042] A boss block 681 is formed on the end face of the single-stage fixed mold core 68 in the direction of the single-stage moving mold core 67. Correspondingly, a molding cavity 671 that cooperates with the boss block 681 is opened on the end face of the single-stage moving mold core 67. A molding notch 682 is opened on the upper edge of the end of the boss block 681. A second cavity hole 672 is opened on the bottom surface of the molding cavity 671.

[0043] The fourth passive core-pulling assembly 612 includes a fourth slider 6121 movably connected in the molding notch 682 to have the function of vertical movement up and down, and a fourth pull rod 6122 obliquely inserted in the fourth slider 6121. The front end of the fourth pull rod 6122 passes through the second cavity 672 and is fixed on the moving module 1. A fourth side molding block 61211 is formed on the outer wall of the fourth slider 6121 on the side close to the single-stage fixed mold core 68 in the direction of the single-stage fixed mold core 68.

[0044] The fifth passive core-pulling assembly 613 includes a fifth slider 6131 movably connected to the front of the fixed module 2 to have the function of vertical movement, a fifth pull rod 6132 obliquely inserted into the fifth slider 6131, and a fifth side molding block 6133 fixed on the fifth slider 6131 near the single-stage fixed mold core 68. The front end of the fifth pull rod 6132 is fixed on the moving module 1.

[0045] The ends of the first side molding block 693, the second side molding block 6103, the first core block 6104, the third side molding block 6113, the second core block 6114, the fourth side molding block 61211, and the fifth side molding block 6133 all cooperate with the corresponding side outer wall of the boss block 681.

[0046] An inner support block 66 is also embedded in the bottom surface of the stepped groove 652.

[0047] Working principle:

[0048] The feed plate 3 and the seat plate 4 are respectively installed on the action mechanism and the machine body of the injection molding machine. The action mechanism drives the feed plate 3 to move backward, which in turn drives the moving module 1 to move backward and towards the stationary module 2 until the two are joined together (existing technology).

[0049] During the movement of the moving module 1, it will drive the first moving mold core 61 and the second moving mold core 62 in the two-stage molding unit of the molding device 6 to move towards the first fixed mold core 65 until the second moving mold core 62 and the first fixed mold core 65 are joined together; at the same time, it will drive the single moving mold core 67 in the single molding unit to move towards the single fixed mold core 68 until the two are joined together.

[0050] Next, the telescopic end of the first core-pulling cylinder 641 in the first active core-pulling assembly 64 extends outward to drive the traction block 642 to move. Then, through the cooperation between the straight section 6421 and the traction section 6422 and the first guide groove 6441 and the second guide groove 6432, the forming pillar 643 is forced to move backward, thereby causing the rear end of the forming pillar 643 to extend into the interior of the secondary moving mold core 62. In addition, the telescopic ends of the second core-pulling cylinders 631 in both second active core-pulling assemblies 63 are simultaneously driven outward to drive... The two drive blocks 632 move relative to each other and gradually approach each other, so that the ends of the first locking block 633 and the second locking block 634 in one of the second active core pulling components 63 respectively fit into contact with the ends of the first locking block 633 and the second locking block 634 in the other second active core pulling component 63. At this time, the first arc-shaped grooves 6331 on the two first locking blocks 633 are joined together and surround the outside of the forming column 643, and the second arc-shaped grooves 6341 on the two second locking blocks 634 are also joined together and surround the outside of the forming column 643.

[0051] During its movement, the single-stage moving mold core 67 drives the first pull rod 692 in each first passive core-pulling assembly 69, the second pull rod 6102 in each second passive core-pulling assembly 610, the third pull rod 6112 in each third passive core-pulling assembly 611, the fourth pull rod 6122 in the fourth passive core-pulling assembly 612, and the fifth pull rod 6132 in the fifth passive core-pulling assembly 613 to move synchronously, thereby forcing each first slider 691, each second slider 6101, and each third slider 6111 to move synchronously. The fourth slider 6121 and the fifth slider 6131 all move toward the single-stage fixed mold core 68, so that the ends of each first side molding block 693, each second side molding block 6103, each first core block 6104, each third side molding block 6113, each second core block 6114, the fourth side molding block 61211, and the fifth side molding block 6133 all extend into the interior of the molding cavity 671 and are all located outside the corresponding side of the boss block 681.

[0052] Subsequently, the molten material enters the moving module 1 through the gate provided in the feed plate 3, and then enters the space between the forming protrusion 651 and the positioning cavity 621, the forming column 643 and the two first arc grooves 6331 and the two second arc grooves 6341, and the boss block 681 and the forming cavity 671 through the sprue in the moving module 1. After cooling, the interface part of the oil filler pipe is formed at the two-stage forming unit, and the cover part of the oil filler pipe is formed at the single-stage forming unit (existing technology).

[0053] Subsequently, the telescopic ends of the first core-pulling cylinder 641 and the two second core-pulling cylinders 631 retract inward, thereby causing the forming column 643 and the first and second locking blocks 633 and 634 in each second active core-pulling assembly 63 to move back to their original positions. Then, the feeding plate 3 is driven forward by the action mechanism, and the secondary moving mold core 62 is driven away from the first fixed mold core 65 by the moving module 1, while the single-stage moving mold core 67 is driven away from the single-stage fixed mold core 68. Finally, the ejection mechanism 5 ejects the formed interface part and the cover part forward (existing technology).

[0054] This invention employs a two-stage molding process, enabling the inner and outer structures of the fuel filler pipe's interface to be molded simultaneously in a single injection molding process, eliminating the need for two separate steps. This significantly simplifies the production process and effectively improves production efficiency. Furthermore, the fuel filler pipe's casing is also integrated into the same injection mold, requiring only one mold to complete the injection molding of both parts of the fuel filler pipe. This greatly reduces mold manufacturing costs and significantly lowers production costs.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A molding die for an automotive fuel filler nozzle, comprising a feed plate and a base plate respectively arranged front and rear, a moving module and a fixed module respectively fixed to the rear side of the feed plate and the front side of the base plate and cooperating with each other, a molding device disposed between the moving module and the fixed module, and an ejection mechanism disposed between the fixed module and the base plate, characterized in that: The molding device includes a two-stage molding unit and a single-stage molding unit respectively arranged vertically. The two-stage molding unit includes a first-stage moving mold core embedded in the rear side of the moving module, a second-stage moving mold core fixed on the end face of the first-stage moving mold core, and a first-stage fixed mold core embedded in the front side of the fixed module and cooperating with the second-stage moving mold core. The single-stage molding unit includes a single-stage moving mold core embedded inside the rear side of the moving module, and a single-stage fixed mold core embedded inside the front side of the fixed module and cooperating with the single-stage moving mold core. A first active core-pulling assembly is also provided between the primary moving mold core and the moving module. The first active core-pulling assembly includes a first core-pulling cylinder fixed on the right outer wall of the primary moving mold core, a traction block movably connected to the bottom outer wall of the primary moving mold core to have left and right translation function, and a forming column movably and obliquely inserted in the primary moving mold core. The telescopic end of the first core-pulling cylinder is arranged parallel to the moving direction of the traction block and fixed on the traction block. A straight section is formed outward on the side of the traction block near the forming column. An inclined traction section is formed at the end of the straight section. A limiting block is formed outward at the front end of the forming column. A pressure block is fixed at the end of the limiting block. A first guide groove and a second guide groove that cooperate with each other are respectively opened on the outer wall of the pressure block and the limiting block. The traction section and the straight section are movably inserted between the first guide groove and the second guide groove.

2. The molding die for a car fuel filler neck according to claim 1, characterized in that, Two second active core-pulling assemblies are also provided between the primary moving mold core and the secondary moving mold core. The second active core-pulling assembly includes a drive block movably connected between the adjacent outer walls of the primary moving mold core and the secondary moving mold core to have linear movement function, a second core-pulling cylinder fixed on the outer wall of the secondary moving mold core, and a first locking block and a second locking block fixed on the drive block and arranged front and back. The telescopic end of the second core-pulling cylinder is arranged parallel to the movement direction of the drive block and fixed on the drive block.

3. The molding die for a car fuel filler neck according to claim 2, characterized in that, The ends of the first and second blocks are respectively provided with concentrically distributed first and second arc-shaped grooves. The inner walls of the first and second arc-shaped grooves are mutually engaged with the outer peripheral surface of the forming column. A conical boss is formed outward from the center of the rear end of the forming column.

4. The molding die for a car fuel filler neck according to claim 1, characterized in that, A forming protrusion is formed on the end face of the first fixed mold core in the direction of the secondary moving mold core. Correspondingly, a positioning cavity that cooperates with the forming protrusion is opened on the end face of the secondary moving mold core. A first cavity hole is opened on the bottom surface of the positioning cavity. The rear end of the forming column passes through the first cavity hole and extends into the interior of the positioning cavity. A stepped groove is opened on one side of the end face of the forming protrusion.

5. The molding die for a car fuel filler neck according to claim 1, characterized in that, The single-stage molding unit further includes two first passive core-pulling components arranged symmetrically on the left and right, two second passive core-pulling components arranged symmetrically on the left and right and located below the two first passive core-pulling components respectively, two third passive core-pulling components arranged symmetrically on the left and right and located below the two second passive core-pulling components respectively, a fourth passive core-pulling component located between the two third passive core-pulling components, and a fifth passive core-pulling component located below the fourth passive core-pulling component.

6. The molding die for a car fuel filler neck according to claim 5, characterized in that, A boss is formed on the end face of the single-stage fixed mold core in the direction of the single-stage moving mold core. Correspondingly, a forming cavity that cooperates with the boss is opened on the end face of the single-stage moving mold core. A forming notch is opened on the upper edge of the end of the boss, and a second cavity hole is opened on the bottom surface of the forming cavity.

7. The molding die for a car fuel filler neck according to claim 6, characterized in that, The fourth passive core-pulling assembly includes a fourth slider movably connected in the molding notch to have the function of vertical movement up and down, and a fourth pull rod obliquely inserted in the fourth slider. The front end of the fourth pull rod passes through the second cavity and is fixed on the moving module. A fourth side molding block is formed on the outer wall of the fourth slider near the single-stage fixed mold core in the direction of the single-stage fixed mold core.

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