A Rubik's Cube central axis forming mold

Abstract

This utility model relates to the field of mold technology, and in particular to a Rubik's Cube central shaft forming mold, comprising a moving mold part with a moving template and a fixed mold part with a fixed template. The moving template and the fixed template each have a lower mold cavity and an upper mold cavity, which together form a workpiece forming cavity for forming the Rubik's Cube central shaft. A lower core rod is provided at the bottom of the lower mold cavity, and an upper core rod is provided at the bottom of the upper mold cavity. Both the upper and lower core rods can extend into the upper and lower ends of a vertical central through hole in the Rubik's Cube central shaft. A first side-pulling slider is slidably mounted laterally on the moving template via a first guide structure. A transverse core rod is mounted on the first side-pulling slider, allowing the transverse core rod to extend into and pass through the transverse central through hole in the Rubik's Cube central shaft. This utility model features a simpler and more reasonable layout design, a more compact mold layout, a simpler side-pulling design, and more stable and reliable operation.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a Rubik's Cube central axis forming mold. Background Technology

[0002] like Figure 1 The diagram shows a Rubik's Cube central axis structure, which includes a horizontal axis 1, a vertical axis 2, and a vertical axis 3. The horizontal axis, vertical axis, and vertical axis intersect at their middle positions. Each of the horizontal axis, vertical axis, and vertical axis is provided with an axially through-hole 4, a longitudinal central hole 5, and a vertical central hole 6.

[0003] Due to the unique structural design of the Rubik's Cube's central axis, when manufacturing it using injection molds, the molds generally suffer from complex core-pulling designs and unreasonable layouts. This results in less compact mold designs, inconvenience in arranging multiple parts in a single mold, low processing efficiency, and increased mold usage costs. Furthermore, existing mold designs suffer from unstable and unreliable side core-pulling mechanisms and unreliable side core-pulling slider closing structures.

[0004] Therefore, how to design a Rubik's Cube central axis forming mold with a simpler and more reasonable layout, a more compact mold layout, a simpler side core-pulling design, and more stable and reliable operation has become a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by this utility model is how to design a Rubik's Cube central shaft forming mold with a simpler and more reasonable layout, a more compact mold layout, a simpler side core pulling design, and more stable and reliable operation.

[0006] To achieve the above objectives, this utility model provides a Rubik's Cube central shaft forming mold, comprising a moving mold portion having a moving template and a fixed mold portion having a fixed template. The moving template and the fixed template each have a lower mold cavity and an upper mold cavity, which together form a workpiece forming cavity for forming the Rubik's Cube central shaft. A lower core rod is provided at the bottom of the lower mold cavity, and an upper core rod is provided at the bottom of the upper mold cavity. The upper and lower core rods can each extend into the upper and lower ends of a vertical central through hole in the Rubik's Cube central shaft. The key feature is that a first guide structure is provided on the moving template. A first side slide block is slidably mounted laterally. A transverse core rod is mounted on the first side slide block, allowing the transverse core rod to extend into and pass through the transverse central through hole of the Rubik's Cube central axis. A second side slide block is provided on the moving template and at each end of the longitudinal axis of the Rubik's Cube central axis corresponding to the workpiece forming cavity. Each of the second side slide blocks is slidably mounted on the moving template through a second guide structure. A longitudinal core rod is mounted on the inner end of each of the second side slide blocks, and the inner ends of the two pairs of longitudinal core rods can each extend into the two ends of the longitudinal central through hole of the Rubik's Cube central axis.

[0007] In this device, during injection molding, the moving mold platen of the moving mold part and the fixed mold platen of the fixed mold part separate, allowing the upper core rod to be pulled out from the upper end of the vertical central through hole of the cube's central axis. Simultaneously, the first and second side-pulling sliders move laterally and longitudinally outwards respectively, causing the lateral core rod to be pulled out from the lateral central through hole of the cube's central axis, and the two paired longitudinal core rods to be pulled out from both ends of the longitudinal central through hole of the cube's central axis. When the ejector rod of the moving mold part pushes the workpiece out of the lower mold cavity, the core rod is pulled out from the lower end of the vertical central through hole of the cube's central axis, completing the demolding process. This core-pulling design is more rational, minimizing the impact of core pulling on the workpiece, better ensuring the quality of core pulling and demolding, and simplifying the core-pulling design.

[0008] As an optimization, the first guide structure includes a transverse guide groove with a T-shaped structure that is disposed on the moving template and arranged laterally. The lower ends of the first side slider protrude outwards on both sides to form a first slider with a T-shaped structure and fits in the transverse guide groove.

[0009] In this way, the first guide structure is simpler to set up, easier to process, and makes the movement of the first side sliding block more stable, improving the stability and quality of core pulling.

[0010] As an optimization, a first helical spring is provided between the inner end face of the transverse guide groove and the inner end face of the first side slide block, and the outer end of the first helical spring extends into the first mounting hole on the side of the first side slide block; the first helical spring can push the first side slide block to move outward, and cause the transverse core rod to exit from the transverse center through hole on the central axis of the cube; the outer side of the upper end of the first side slide block is set with an incline to form a first mating incline, and a first driving block is provided on the fixed template corresponding to the first side slide block. The inner side of the lower end of the first driving block is designed with an incline to form a first driving incline. When the moving template and the fixed template are closed, the first driving incline can be supported against the first mating incline and push the first side slide block to move inward against the thrust of the first helical spring.

[0011] In this way, when the moving template and the fixed template close, the first driving inclined surface engages with the first mating inclined surface and pushes the first side-pulling slider inward against the thrust of the first helical spring. When the moving template and the fixed template separate, the first driving inclined surface engages with the first mating inclined surface and works in conjunction with the first helical spring to make the first side-pulling slider move outward evenly and stably, which can improve the stability of core pulling. Furthermore, by controlling the opening speed of the moving template and the fixed template, the sliding speed of the first side-pulling slider can be controlled, making the movement of the transverse core rod driven by the first side-pulling slider more stable and reliable, thereby improving the quality of side core pulling.

[0012] As an optimization, a first limiting screw is provided on the bottom surface of the outer end of the transverse guide groove to limit the outward movement of the first side sliding block.

[0013] In this way, by setting the first limiting screw, the outward movement of the first side sliding block can be restricted, making the design simpler and more reasonable.

[0014] As an optimization, a push rod hole is provided at the bottom of the lower mold cavity and a push rod is provided. The push rod is hollow and a center rod is provided in the middle of the push rod. The upper end of the center rod extends to the upper end face of the push rod and forms the lower core rod.

[0015] This allows for the replacement of the easily worn lower core rod by changing the center rod. Furthermore, during mold opening, the center rod remains stationary relative to the moving platen, while the ejector pin pushes the workpiece outwards to the outside of the lower mold cavity. The overall structural design is simpler and more rational, and facilitates the simultaneous arrangement of the lower core rod and ejector pin.

[0016] As an optimization, a first fixing hole and a second fixing hole are respectively provided on the first side sliding block and the second side sliding block. A first mounting rod and a second mounting rod are respectively installed in the first fixing hole and the second fixing hole. The inner ends of the first mounting rod and the second mounting rod are respectively integrally formed with a transverse core rod and a longitudinal core rod.

[0017] This makes it easier to install and fix the first mounting rod and the second mounting rod on the first side sliding block and the second side sliding block, respectively, and each forms a transverse core rod and a longitudinal core rod.

[0018] As an optimization, the second guide structure includes a longitudinally arranged T-shaped guide groove on the moving template, and the lower ends of the second side sliders each protrude outward to form a T-shaped second slider and fit into the longitudinal guide groove.

[0019] In this way, the design of the second guide structure is simpler and more reasonable, which can better guide the second side slider and make the operation more stable and reliable.

[0020] As an optimization, a second helical spring is provided between the inner end face of the longitudinal guide groove and the inner end face of the second side slide block, and the outer end of the second helical spring extends into the second mounting hole on the side of the second side slide block. The second helical spring can push the second side slide block to move outward, and cause the longitudinal core rod to exit from the longitudinal center through hole of the cube's central axis. The outer side of the upper end of the second side slide block is set with an inclined surface to form a second mating inclined surface. A second driving inclined surface is provided on the fixed template and corresponding to the second mating inclined surface of the second side slide block. When the moving template and the fixed template are closed, the second driving inclined surface can be supported against the second mating inclined surface and push the second side slide block to move inward against the thrust of the second helical spring.

[0021] In this way, when the moving template and the fixed template separate, the second driving inclined surface cooperates with the second mating inclined surface and works in conjunction with the second helical spring to make the second side sliding block move outward evenly and stably, which can improve the stability of core pulling. Furthermore, by controlling the opening speed of the moving template and the fixed template, the sliding speed of the second side sliding block can be controlled, making the movement of the longitudinal core rod driven by the second side sliding block more stable and reliable, thereby improving the quality of side core pulling.

[0022] Furthermore, a second limiting screw is provided on the bottom surface of the outer end of the longitudinal guide groove to limit the outward movement of the second side sliding block.

[0023] As an optimization, the moving template includes a moving template body with a rectangular plate structure design, and a moving module disposed in a rectangular mounting cavity in the middle of the upper surface of the moving template body; the fixed template includes a fixed template body with a rectangular plate structure design, and a fixed module disposed in a rectangular mounting cavity in the middle of the lower surface of the fixed template body.

[0024] In this way, the structural design of the moving and fixed templates is more reasonable, allowing for more targeted replacement of the moving and fixed modules and reducing the cost of using the mold.

[0025] As an optimization, a pair of lower mold cavities are provided at both ends of the longitudinal direction on the upper surface of the moving module, and an upper mold cavity is provided on the fixed module corresponding to the lower mold cavity.

[0026] In this way, four pieces per mold can better improve production efficiency.

[0027] In summary, the above-mentioned device features a simpler and more reasonable layout design, a more compact mold layout, a simpler side core-pulling design, and more stable and reliable operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the central axis of the Rubik's Cube in a specific embodiment of this utility model.

[0029] Figure 2 This is a schematic diagram of the Rubik's Cube central axis forming mold in a specific embodiment of this utility model.

[0030] Figure 3 yes Figure 2 A schematic diagram omitting the fixed mold section.

[0031] Figure 4 yes Figure 3 A schematic diagram after rotating by one angle.

[0032] Figure 5 yes Figure 4 A schematic diagram with some components omitted.

[0033] Figure 6 yes Figure 2 A schematic diagram of the top rod part.

[0034] Figure 7 yes Figure 2 A schematic diagram omitting the moving model section.

[0035] Figure 8 yes Figure 7 A schematic diagram after rotating by one angle.

[0036] Figure 9 yes Figure 2 A schematic diagram of the main body of the dynamic template.

[0037] Figure 10 yes Figure 2 A schematic diagram of the dynamic module in the image.

[0038] Figure 11 yes Figure 2 A schematic diagram of the main body of the fixed template.

[0039] Figure 12 yes Figure 2 A schematic diagram of a fixed module in the diagram.

[0040] Figure 13 yes Figure 2 A top view diagram omitting the fixed mold section.

[0041] Figure 14 yes Figure 13 A schematic diagram of the AA section.

[0042] Figure 15 yes Figure 14 A magnified view of position C in the diagram.

[0043] Figure 16 yes Figure 13 BB cross-sectional diagram. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] like Figures 1 to 16 As shown, a Rubik's Cube central axis forming mold includes a moving mold portion with a moving template 11 and a fixed mold portion with a fixed template 12. The moving template and the fixed template each have a lower mold cavity 13 and an upper mold cavity 14, respectively, which together form a workpiece forming cavity for forming the Rubik's Cube central axis 15. A lower core rod 16 is provided at the bottom of the lower mold cavity, and an upper core rod 17 is provided at the bottom of the upper mold cavity. The upper and lower core rods can each extend into the upper and lower ends of a vertical central through hole on the Rubik's Cube central axis. A sliding support can be mounted on the moving template laterally via a first guide structure. A first side sliding block 18 is provided, and a transverse core rod 19 is installed on the first side sliding block, so that the transverse core rod can extend into and pass through the transverse central through hole of the Rubik's Cube central axis; a second side sliding block 20 is provided on the moving template and at both ends of the longitudinal axis of the Rubik's Cube central axis corresponding to the workpiece forming cavity. The second side sliding blocks are each longitudinally slidably installed on the moving template through a second guide structure. A longitudinal core rod 21 is installed at the inner end of each of the second side sliding blocks, and the inner ends of the two pairs of longitudinal core rods can each extend into the two ends of the longitudinal central through hole of the Rubik's Cube central axis.

[0046] In this device, during injection molding, the moving mold platen of the moving mold part and the fixed mold platen of the fixed mold part separate, allowing the upper core rod to be pulled out from the upper end of the vertical central through hole of the cube's central axis. Simultaneously, the first and second side-pulling sliders move laterally and longitudinally outwards respectively, causing the lateral core rod to be pulled out from the lateral central through hole of the cube's central axis, and the two paired longitudinal core rods to be pulled out from both ends of the longitudinal central through hole of the cube's central axis. When the ejector rod of the moving mold part pushes the workpiece out of the lower mold cavity, the core rod is pulled out from the lower end of the vertical central through hole of the cube's central axis, completing the demolding process. This core-pulling design is more rational, minimizing the impact of core pulling on the workpiece, better ensuring the quality of core pulling and demolding, and simplifying the core-pulling design.

[0047] In this specific embodiment, the first guide structure includes a transverse guide groove 22 with a T-shaped structure that is disposed on the moving template and arranged laterally. The lower ends of the first side slider each protrude outward to form a first slider with a T-shaped structure and cooperates in the transverse guide groove.

[0048] In this way, the first guide structure is simpler to set up, easier to process, and makes the movement of the first side sliding block more stable, improving the stability and quality of core pulling.

[0049] In this specific embodiment, a first helical spring 23 is provided between the inner end face of the transverse guide groove and the inner end face of the first side slide block, and the outer end of the first helical spring extends into the first mounting hole on the side of the first side slide block; the first helical spring can push the first side slide block to move outward, and cause the transverse core rod to exit from the transverse center through hole on the central axis of the cube; the outer side of the upper end of the first side slide block is inclined and forms a first mating inclined surface 24, and a first driving block 25 is provided on the fixed template and corresponding to the first side slide block. The inner side of the lower end of the first driving block is designed with an inclined surface and forms a first driving inclined surface. When the moving template and the fixed template are closed, the first driving inclined surface can be supported on the first mating inclined surface and push the first side slide block to move inward against the thrust of the first helical spring.

[0050] In this way, when the moving template and the fixed template close, the first driving inclined surface engages with the first mating inclined surface and pushes the first side-pulling slider inward against the thrust of the first helical spring. When the moving template and the fixed template separate, the first driving inclined surface engages with the first mating inclined surface and works in conjunction with the first helical spring to make the first side-pulling slider move outward evenly and stably, which can improve the stability of core pulling. Furthermore, by controlling the opening speed of the moving template and the fixed template, the sliding speed of the first side-pulling slider can be controlled, making the movement of the transverse core rod driven by the first side-pulling slider more stable and reliable, thereby improving the quality of side core pulling.

[0051] In this specific embodiment, a first limiting screw 26 is provided on the bottom surface of the outer end of the transverse guide groove to limit the position of the first side sliding block moving outward.

[0052] In this way, by setting the first limiting screw, the outward movement of the first side sliding block can be restricted, making the design simpler and more reasonable.

[0053] In this specific embodiment, a push rod hole is provided at the bottom of the lower mold cavity and a push rod 27 is provided. The push rod is hollow and a center rod 28 is provided in the middle of the push rod. The upper end of the center rod extends to the upper end face of the push rod and forms the lower core rod.

[0054] This allows for the replacement of the easily worn lower core rod by changing the center rod. Furthermore, during mold opening, the center rod remains stationary relative to the moving platen, while the ejector pin pushes the workpiece outwards to the outside of the lower mold cavity. The overall structural design is simpler and more rational, and facilitates the simultaneous arrangement of the lower core rod and ejector pin.

[0055] In this specific embodiment, a first fixing hole and a second fixing hole are respectively provided on the first side sliding block and the second side sliding block. A first mounting rod 29 and a second mounting rod 30 are respectively installed in the first fixing hole and the second fixing hole. The inner ends of the first mounting rod and the second mounting rod are respectively integrally formed with a transverse core rod and a longitudinal core rod.

[0056] This makes it easier to install and fix the first mounting rod and the second mounting rod on the first side sliding block and the second side sliding block, respectively, and each forms a transverse core rod and a longitudinal core rod.

[0057] In this specific embodiment, the second guide structure includes a longitudinal guide groove 31 with a T-shaped structure that is disposed on the moving template and arranged longitudinally. The lower ends of the second side slider protrude outwards on both sides to form a second slider with a T-shaped structure and cooperate in the longitudinal guide groove.

[0058] In this way, the design of the second guide structure is simpler and more reasonable, which can better guide the second side slider and make the operation more stable and reliable.

[0059] In this specific embodiment, a second helical spring 32 is provided between the inner end face of the longitudinal guide groove and the inner end face of the second side slide block, and the outer end of the second helical spring extends into the second mounting hole on the side of the second side slide block. The second helical spring can push the second side slide block to move outward, and cause the longitudinal core rod to exit from the longitudinal center through hole of the cube's central axis. The outer side of the upper end of the second side slide block is inclined to form a second mating inclined surface 33. A second driving inclined surface 34 is provided on the fixed template and corresponding to the second mating inclined surface of the second side slide block. When the moving template and the fixed template are closed, the second driving inclined surface can be supported against the second mating inclined surface and push the second side slide block to move inward against the thrust of the second helical spring.

[0060] In this way, when the moving template and the fixed template separate, the second driving inclined surface cooperates with the second mating inclined surface and works in conjunction with the second helical spring to make the second side sliding block move outward evenly and stably, which can improve the stability of core pulling. Furthermore, by controlling the opening speed of the moving template and the fixed template, the sliding speed of the second side sliding block can be controlled, making the movement of the longitudinal core rod driven by the second side sliding block more stable and reliable, thereby improving the quality of side core pulling.

[0061] Furthermore, a second limiting screw 35 is provided on the bottom surface of the outer end of the longitudinal guide groove to limit the outward movement of the second side sliding block.

[0062] In this specific embodiment, the moving template includes a moving template body 36 with a rectangular plate structure, and a moving module 37 disposed in a rectangular mounting cavity in the middle of the upper surface of the moving template body; the fixed template includes a fixed template body 38 with a rectangular plate structure, and a fixed module 39 disposed in a rectangular mounting cavity in the middle of the lower surface of the fixed template body.

[0063] In this way, the structural design of the moving and fixed templates is more reasonable, allowing for more targeted replacement of the moving and fixed modules and reducing the cost of using the mold.

[0064] In this specific embodiment, a pair of lower mold cavities are provided at both ends of the longitudinal direction on the upper surface of the moving module, and an upper mold cavity is provided on the fixed module corresponding to the lower mold cavity.

[0065] In this way, four pieces per mold can better improve production efficiency.

[0066] In summary, the above-mentioned device features a simpler and more reasonable layout design, a more compact mold layout, a simpler side core-pulling design, and more stable and reliable operation.

[0067] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A Rubik's Cube central shaft forming mold, comprising a moving mold portion having a moving template and a fixed mold portion having a fixed template, wherein the moving template and the fixed template are each provided with a lower mold cavity and an upper mold cavity, and the upper mold cavity and the lower mold cavity can together form a workpiece forming cavity for forming a Rubik's Cube central shaft; a lower core rod is provided at the bottom of the lower mold cavity, and an upper core rod is provided at the bottom of the upper mold cavity, wherein the upper core rod and the lower core rod can each extend into the upper and lower ends of a vertical central through hole in the Rubik's Cube central shaft; characterized in that... ； A first side sliding block is slidably mounted on the moving template via a first guide structure. A transverse core rod is mounted on the first side sliding block, allowing the transverse core rod to extend into and pass through the transverse central through hole of the Rubik's Cube central axis. A second side sliding block is provided on the moving template at both ends of the longitudinal axis of the Rubik's Cube central axis corresponding to the workpiece forming cavity. Each of the second side sliding blocks is slidably mounted on the moving template via a second guide structure. A longitudinal core rod is mounted on the inner end of each of the second side sliding blocks, and the inner ends of the two pairs of longitudinal core rods can each extend into the two ends of the longitudinal central through hole of the Rubik's Cube central axis.

2. The Rubik's Cube central axis forming mold as described in claim 1, characterized in that: The first guide structure includes a transverse guide groove with a T-shaped structure that is disposed on the moving template and arranged laterally. The lower ends of the first side slider protrude outwards on both sides to form a first slider with a T-shaped structure and fits in the transverse guide groove.

3. The Rubik's Cube central axis forming mold as described in claim 2, characterized in that: A first helical spring is provided between the inner end face of the transverse guide groove and the inner end face of the first side slide block, and the outer end of the first helical spring extends into the first mounting hole on the side of the first side slide block. The first helical spring can push the first side slide block to move outward, and cause the transverse core rod to exit from the transverse center through hole on the central axis of the cube. The outer side of the upper end of the first side slide block is set with an incline to form a first mating incline. A first driving block is provided on the fixed template and corresponding to the first side slide block. The inner side of the lower end of the first driving block is designed with an incline to form a first driving incline. When the moving template and the fixed template are closed, the first driving incline can be supported against the first mating incline and push the first side slide block to move inward against the thrust of the first helical spring.

4. The Rubik's Cube central axis forming mold as described in claim 2, characterized in that: A first limiting screw is provided on the bottom surface of the outer end of the transverse guide groove to limit the outward movement of the first side slide block.

5. The Rubik's Cube central axis forming mold as described in claim 1, characterized in that: A push rod hole is provided at the bottom of the lower mold cavity and a push rod is provided. The push rod is hollow and a center rod is provided in the middle of the push rod. The upper end of the center rod extends to the upper end face of the push rod and forms the lower core rod.

6. The Rubik's Cube center axis forming mold as described in claim 1, characterized in that: Each of the first and second side sliding blocks is provided with a first fixing hole and a second fixing hole. A first mounting rod and a second mounting rod are installed in the first fixing hole and the second fixing hole, respectively. The inner ends of the first mounting rod and the second mounting rod are integrally formed with a transverse core rod and a longitudinal core rod.

7. The Rubik's Cube center axis forming mold as described in claim 1, characterized in that: The second guide structure includes a longitudinally arranged T-shaped guide groove on the moving template, and the lower ends of the second side sliders protrude outwards to form T-shaped second sliders that fit into the longitudinal guide groove.

8. The Rubik's Cube center axis forming mold as described in claim 7, characterized in that: A second helical spring is provided between the inner end face of the longitudinal guide groove and the inner end face of the second side slide block, and the outer end of the second helical spring extends into the second mounting hole on the side of the second side slide block. The second helical spring can push the second side slide block to move outward, and cause the longitudinal core rod to exit from the longitudinal center through hole of the cube's central axis. The outer side of the upper end of the second side slide block is set with an inclined surface to form a second mating inclined surface. A second driving inclined surface is provided on the fixed template and corresponding to the second mating inclined surface of the second side slide block. When the moving template and the fixed template are closed, the second driving inclined surface can be supported against the second mating inclined surface and push the second side slide block to move inward against the thrust of the second helical spring.

9. The Rubik's Cube center axis forming mold as described in claim 1, characterized in that: The moving template includes a moving template body with a rectangular plate structure design, and a moving module disposed in a rectangular mounting cavity in the middle of the upper surface of the moving template body; the fixed template includes a fixed template body with a rectangular plate structure design, and a fixed module disposed in a rectangular mounting cavity in the middle of the lower surface of the fixed template body.

10. A Rubik's Cube center axis forming mold as described in claim 9, characterized in that: The moving module has a pair of lower mold cavities at both ends of its longitudinal direction on its upper surface, and the fixed module has an upper mold cavity corresponding to each of its lower mold cavities.

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