A core-pulling mechanism of a forklift casting forming die

Abstract

The present application relates to die casting mould technical field, specifically is a kind of forklift casting forming mould core-pulling mechanism, including movable mould core, the fixed mould core of being arranged at the rear of movable mould core and being mutually matched with movable mould core, and two symmetrical core-pulling units being arranged in movable mould core and fixed mould core left and right sides;Core-pulling unit includes the main slider that can slide left and right, and at least one oblique insertion connection in main slider and all mutually parallel drive rod;The main slider between two core-pulling units and fixed mould core still all are equipped with a forming module, two forming modules are centrally symmetric, forming module includes the core-pulling seat of being fixed on the side of main slider close to fixed mould core, and the traction strip that slides along up and down direction and is elastically connected between movable mould core and fixed mould core to always have upward or downward reset movement tendency;The present application simplifies processing step to reach the effect of time-saving and labor-saving and guarantees production efficiency;Meanwhile, it also eliminates processing error to improve the positioning accuracy of through hole.

Description

Technical Field

[0001] This application relates to the field of die-casting mold technology, and more specifically, to a core-pulling mechanism for a forklift casting mold. Background Technology

[0002] Forklifts are a common type of industrial handling vehicle. Forklifts use a lot of metal castings, including flat sleeves that are open at only one end. Like other castings, sleeves are produced using molding dies in die-casting equipment.

[0003] Because the sheath has two limiting grooves of different depths on both sides of the open end and a through hole at the closed end, the existing molding die can only form the two limiting grooves. The through hole at the closed end needs to be drilled separately after demolding, which makes the processing steps more complicated. Because it requires frequent loading and unloading, the operation is time-consuming and labor-intensive, thus affecting production efficiency. At the same time, the separate drilling process has certain processing errors compared with the one-time molding process, resulting in lower positioning accuracy of the through hole, which urgently needs to be resolved. Summary of the Invention

[0004] In view of the current state of the prior art, the technical problem to be solved by the present invention is to provide a core-pulling mechanism for forklift casting molds that simplifies the processing steps to achieve time and labor saving and ensures production efficiency, and also eliminates processing errors to improve the positioning accuracy of through holes.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a core-pulling mechanism for a forklift casting forming mold, including a moving mold core, a fixed mold core disposed behind the moving mold core and cooperating with the moving mold core, and two core-pulling units symmetrically disposed on the left and right sides of the moving mold core and the fixed mold core; the core-pulling unit includes a main slider that can slide left and right, and at least one drive rod that is obliquely inserted and connected in the main slider and is parallel to each other; Each of the two core-pulling units is further provided with a forming module between the main slider and the fixed mold core. The two forming modules are arranged in a centrally symmetrical manner. The forming module includes a core-pulling seat fixed on the main slider near the fixed mold core, and a traction bar that slides in the up and down direction and is elastically connected between the moving mold core and the fixed mold core so as to always have an upward or downward reset movement tendency. The core-pulling seat has multiple horizontally arranged tongue-shaped core strips arranged sequentially from top to bottom in the direction of the fixed mold core. The lower outer wall of the root of each tongue-shaped core strip and the corresponding outer wall of the core-pulling seat have a horizontally arranged main slotted block in the direction of the fixed mold core, which is connected to the traction strip to drive it to move upward or downward. Each of the aforementioned traction bars is also fitted with a plurality of pins on the side near the core-pulling seat. These pins can tilt and slide elastically in the left-right direction to always have a tendency to move back towards the traction bar direction and are arranged in parallel from top to bottom. The number of pins is equal to the number of tongue-shaped core bars.

[0006] Preferably, the outer wall of the traction bar near the core-pulling seat has traction cavities that are equal in number to the number of tongue-shaped core bars and distributed sequentially from top to bottom. The upper inner wall of each traction cavity has a first guide slope. The end of each main slotted block has a transversely arranged extension bar that does not contact the outer wall of the tongue-shaped core bar, and the upper edge of the end of each extension bar has a second guide slope that cooperates with the first guide slope.

[0007] Preferably, the outer wall of the traction bar near the core-pulling seat and away from the core-pulling seat are respectively provided with an inclined first cavity and a second cavity. An inclined guide slot is provided between the bottom surface of the first cavity and the bottom surface of the second cavity. The end of each pin near the traction bar passes through a corresponding guide slot and extends into a corresponding second cavity.

[0008] Preferably, a first retaining ring and a second retaining ring are formed outward on the outer peripheral surface of the ejector pin, respectively located inside the first recessed cavity and the second recessed cavity. A return spring is also sleeved on the ejector pin between the second retaining ring and the bottom surface of the second recessed cavity. The return spring is always in a compressed state so that the first retaining ring slides against the bottom surface of the first recessed cavity.

[0009] Preferably, the outer diameter of the first retaining ring, the outer diameter of the second retaining ring, and the outer diameter of the return spring facing the guide slot are all greater than the width of the guide slot, and the outer diameter of the return spring facing the second retaining ring is smaller than the outer diameter of the second retaining ring.

[0010] Preferably, both the left and right edges of the end faces of the moving mold core and the fixed mold core are provided with a molding cavity assembly that is centrally symmetrically distributed. The molding cavity assembly includes a plurality of tongue-shaped molding cavities arranged laterally and distributed sequentially from top to bottom. The number of tongue-shaped molding cavities is equal to the number of tongue-shaped core strips. The shape and position of the tongue-shaped molding cavities are respectively matched with the shape and position of the tongue-shaped core strips.

[0011] Preferably, both the moving mold core and the fixed mold core have two vertically distributed straight grooves arranged between the two molding cavity assemblies and respectively cooperating with the traction bars in the two molding modules. The front and rear sides of each traction bar are slidably embedded in the two straight grooves on the same side of the moving mold core and the fixed mold core respectively.

[0012] Preferably, a first positioning cavity that cooperates with the main slotting block is provided on the lower inner wall of the root of each of the two tongue-shaped forming cavities located on the moving mold core and the fixed mold core respectively and corresponding to each other. A transversely distributed strip-shaped cavity that cooperates with the extension strip is also provided between the inner wall of the side facing the traction strip and the corresponding inner wall of a nearby straight groove.

[0013] Preferably, each of the tongue-shaped forming cavities has an inclined guide pin groove that cooperates with the ejector pin between the inner wall of the end of each cavity and the inner wall of the corresponding side of a nearby straight groove. The end of each ejector pin away from the traction bar is movably embedded between two guide pin grooves located on the moving mold core and the fixed mold core, respectively, and corresponding to each other.

[0014] Compared with the prior art, the advantages of the present invention are as follows: This invention, by using the main and auxiliary slotted blocks on the core-pulling seat to form two limiting grooves of different depths on both sides of the opening end of the sheath, can also drive the ejector pin to reciprocate by the cooperation of the extension strip and the traction strip on the main slotted block. Thus, the through hole located at its closed end is formed at one time during casting, without the need for a separate drilling process. This simplifies the processing steps, achieving time and labor savings while ensuring production efficiency. At the same time, it also eliminates processing errors to improve the positioning accuracy of the through hole. Attached Figure Description

[0015] 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: Figure 1 This is an exploded structural diagram of the left front side of the present invention; Figure 2 This is an exploded view of the left front side of the fixed mold core and core pulling unit of the present invention; Figure 3 This is a top-side structural diagram of the traction bar and ejector pin of the present invention; Figure 4 This is a front cross-sectional view of the traction bar and ejector pin of the present invention. Detailed Implementation

[0016] The embodiments of this application will now be described in more detail with reference to the accompanying drawings. Although some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the accompanying drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0017] It should be understood that the various steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown, and the scope of this application is not limited in this respect.

[0018] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the relevant definitions of other terms will be given in the description below.

[0019] It should be noted that the concepts of "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0020] It should be noted that the terms "a" and "a plurality of" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0021] like Figures 1 to 4 As shown, a core-pulling mechanism for a forklift casting mold includes a moving mold core 3, a fixed mold core 4 located behind the moving mold core 3 and cooperating with the moving mold core 3, and two core-pulling units 5 symmetrically located on the left and right sides of the moving mold core 3 and the fixed mold core 4; the core-pulling unit 5 includes a main slider 51 that can slide left and right, and at least one drive rod 52 that is obliquely inserted and connected in the main slider 51 and is parallel to each other.

[0022] Each of the two core-pulling units 5 has a forming module between the main slider 51 and the fixed mold core 4. The two forming modules are arranged symmetrically at the center. The forming module includes a core-pulling seat 53 fixed on the main slider 51 near the fixed mold core 4, and a traction bar 54 that slides in the up and down direction and is elastically connected between the moving mold core 3 and the fixed mold core 4 so as to always have an upward or downward reset movement tendency.

[0023] The core-pulling base 53 has multiple horizontally arranged tongue-shaped core strips 535 arranged from top to bottom in the direction of the fixed mold core 4. The lower outer wall of the root of each tongue-shaped core strip 535 and the corresponding outer wall of the core-pulling base 53 are connected to a main slotted block 532 in the direction of the fixed mold core 4, and are connected to the traction bar 54 to drive it to move up or down.

[0024] Each traction bar 54 has multiple ejector pins 55 inserted on the side near the core-pulling seat 53. These pins 55 can tilt and slide elastically in the left and right directions to always have the tendency to move back towards the traction bar 54. They are arranged in parallel from top to bottom. The number of ejector pins 55 is equal to the number of tongue-shaped core bars 535.

[0025] On the outer wall of the traction bar 54 near the core-pulling seat 53, there are traction cavities 541, which are the same number as the tongue-shaped core bars 535 and distributed from top to bottom. Each traction cavity 541 has a first guide slope 545 on its upper inner wall. Each main slotted block 532 has an extension bar 533 that is horizontally arranged and does not contact the outer wall of the tongue-shaped core bar 535 at its end, facing the fixed mold core 4. Each extension bar 533 has a second guide slope 534 that cooperates with the first guide slope 545 on its upper edge.

[0026] The outer wall of the traction bar 54 near the core-pulling seat 53 and away from the core-pulling seat 53 is provided with an inclined first cavity 542 and a second cavity 544 respectively. An inclined guide slot 543 is provided between the bottom surface of the first cavity 542 and the bottom surface of the second cavity 544. The end of each pin 55 near the traction bar 54 passes through a corresponding guide slot 543 and extends into a corresponding second cavity 544.

[0027] On the outer peripheral surface of the ejector pin 55, a first retaining ring 552 and a second retaining ring 551 are formed outwardly, respectively located inside the first recessed cavity 542 and the second recessed cavity 544. A return spring 56 is also sleeved on the outside of the ejector pin 55, located between the second retaining ring 551 and the bottom surface of the second recessed cavity 544. The return spring 56 is always in a compressed state so that the first retaining ring 552 slides against the bottom surface of the first recessed cavity 542.

[0028] The outer diameters of the first retaining ring 552, the second retaining ring 551, and the outer diameter of the return spring 56 facing the guide slot 543 are all greater than the width of the guide slot 543, while the outer diameter of the return spring 56 facing the second retaining ring 551 is smaller than the outer diameter of the second retaining ring 551.

[0029] Both the left and right edges of the end faces of the moving mold core 3 and the fixed mold core 4 are provided with a molding cavity assembly that is centrally symmetrically distributed. The molding cavity assembly includes multiple tongue-shaped molding cavities 6 arranged laterally and distributed from top to bottom. The number of tongue-shaped molding cavities 6 is equal to the number of tongue-shaped core strips 535. The shape and position of the tongue-shaped molding cavities 6 are respectively matched with the shape and position of the tongue-shaped core strips 535.

[0030] Two vertically distributed, left-right arranged straight grooves 65 are provided on the end faces of the moving mold core 3 and the fixed mold core 4, which cooperate with the traction strips 54 in the two molding cavities respectively. The front and rear sides of each traction strip 54 are slidably embedded in the two straight grooves 65 on the same side of the moving mold core 3 and the fixed mold core 4 respectively.

[0031] On the lower inner wall of the root of each of the two tongue-shaped forming cavities 6 located on the moving mold core 3 and the fixed mold core 4 respectively, a first positioning cavity 62 is provided to cooperate with the main slotted block 532. On the inner wall of each first positioning cavity 62 facing the traction bar 54, a strip-shaped cavity 63 is also provided between the inner wall of the corresponding side of a nearby straight groove 65 and the inner wall of the side facing the traction bar 54. The strip-shaped cavity 63 is distributed laterally and cooperates with the extension bar 533.

[0032] Each tongue-shaped forming cavity 6 has an inclined guide pin groove 64 that cooperates with the ejector pin 55 between the inner wall of the end of the cavity and the corresponding inner wall of the adjacent straight groove 65. The end of each ejector pin 55 away from the traction bar 54 is movably embedded between two guide pin grooves 64 located on the moving mold core 3 and the fixed mold core 4 respectively and corresponding to each other.

[0033] A transversely arranged secondary slotted block 531 is formed between the upper outer wall of the root of the tongue-shaped core strip 535 and the corresponding outer wall of the core-pulling seat 53, both facing the fixed mold core 4. A second positioning cavity 61 that cooperates with the secondary slotted block 531 is formed on the upper inner wall of the root of the two tongue-shaped forming cavities 6 located on the moving mold core 3 and the fixed mold core 4 respectively.

[0034] Working principle: Moving mold plate 1 and fixed mold plate 2 are respectively set on the front side of moving mold core 3 and the rear side of fixed mold core 4. Moving mold core 3 and fixed mold core 4 are respectively embedded and fixed inside the rear side of moving mold core 3 and the front side of fixed mold plate 2. Then, feeding plate 7 is fixed on the front side of moving mold plate 1. Feeding plate 7 together with moving mold plate 1 is fixed on the action mechanism of die casting machine. Then, fixed mold plate 2 is fixed on the base of die casting machine. Then, the main slider 51 in each core pulling unit 5 is slidably connected to the front side of fixed mold plate 2 in the left and right direction. At the same time, the front end of each drive rod 52 is fixed on moving mold plate 1.

[0035] The feeding plate 7 and the moving template 1 are driven to move backward by the action mechanism until the moving template 1 and the fixed template 2 are engaged with each other, thereby making the end face of the moving mold core 3 and the end face of the fixed mold core 4 also engage with each other, so that each tongue-shaped forming cavity 6 on the moving mold core 3 and the corresponding tongue-shaped forming cavity 6 on the fixed mold core 4 are engaged with each other. The above structure and principle are existing technologies.

[0036] At this time, each second positioning cavity 61 on the moving mold core 3 is also paired with a corresponding second positioning cavity 61 on the fixed mold core 4, each first positioning cavity 62 on the moving mold core 3 is also paired with a corresponding first positioning cavity 62 on the fixed mold core 4, and each strip cavity 63 on the moving mold core 3 is also paired with a corresponding strip cavity 63 on the fixed mold core 4.

[0037] During the backward movement of the moving template 1, each drive rod 52 moves synchronously with the moving template 1, thereby forcing each main slider 51 to move towards the fixed mold core 4. This causes each tongue-shaped core strip 535 to gradually insert into the two tongue-shaped forming cavities 6 located on the moving mold core 3 and the fixed mold core 4 respectively and corresponding to each other. At the same time, each secondary slotting block 531 gradually inserts into the two second positioning cavities 61 located on the moving mold core 3 and the fixed mold core 4 respectively and corresponding to each other. Also, each main slotting block 532 gradually inserts into the two first positioning cavities 62 located on the moving mold core 3 and the fixed mold core 4 respectively and corresponding to each other. During the above process, after the end of each extension strip 533 passes through the two strip cavities 63 located on the moving mold core 3 and the fixed mold core 4 respectively and corresponding to each other, it will gradually insert into a corresponding traction cavity 541 on a nearby traction strip 54.

[0038] Since the second guide slope 534 located at the end of the extension bar 533 cooperates with the first guide slope 545 located in the traction cavity 541, when the second guide slope 534 is attached to the first guide slope 545 and slides along it, the traction bar 54 will be forced to move upward. Since the end of each ejector pin 55 away from the traction bar 54 is movably embedded between two guide pin grooves 64 located on the moving mold core 3 and the fixed mold core 4 respectively and corresponding to each other, each ejector pin 55 can only move along its axial direction. When the traction bar 54 moves upward, the bottom surface of the first recessed cavity 542 will force the first retaining ring 552 to move relative to the bottom surface of the first recessed cavity 542, thereby forcing the ejector pin 55 to tilt and move towards the tongue-shaped forming cavity 6, so that the end of the ejector pin 55 away from the traction bar 54 extends into the interior of the tongue-shaped forming cavity 6. During this process, the ejector pin 55 itself slides along the guide groove 543, and the second retaining ring 551 gradually approaches the bottom surface of the second recessed cavity 544 to compress the return spring 56.

[0039] Next, the die-casting machine feeds molten metal into two tongue-shaped forming cavities 6 located on the moving mold core 3 and the fixed mold core 4 respectively through the gate in the feed plate 7 and the runner in the moving mold plate 1. After cooling, a forklift casting is formed. The main slotting block 532 and the secondary slotting block 531 form a limiting groove of different depths on both sides of the opening of the forklift casting, while the ejector pin 55 forms a through hole at the closed end of the forklift casting. Finally, the feed plate 7 and the moving mold plate 1 are driven forward by the action mechanism, and the formed forklift casting is ejected forward by the ejection mechanism in the fixed mold plate 2 (existing technology).

[0040] During the above process, the forward movement of the moving template 1 will similarly cause each main slider 51 to move away from the fixed mold core 4, and similarly cause the end of each extension bar 533 to leave the traction cavity 541, thereby causing the traction bar 54 to move downward or reset downward by means of its own elastic movement function; when the traction bar 54 moves, the first retaining ring 552 and the bottom surface of the first recess 542 move in opposite directions, the rebound force accumulated by the reset spring 56 is released, and the end of the ejector pin 55 away from the traction bar 54 retracts back into the two guide pin grooves 64.

[0041] This invention, by using the main slotted block 532 and the secondary slotted block 531 on the core-pulling seat 53 to form two limiting grooves of different depths on both sides of the opening end of the sheath, can also drive the ejector pin 55 to reciprocate by the cooperation of the extension strip 533 and the traction strip 54 on the main slotted block 532. Thus, the through hole located at its closed end is formed at one time during casting, without the need for a separate drilling process. This simplifies the processing steps, achieving time and labor saving and ensuring production efficiency. At the same time, it also eliminates processing errors to improve the positioning accuracy of the through hole.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention 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 the present invention.

Claims

1. A core-pulling mechanism for a forklift casting mold, comprising a movable mold core, a fixed mold core disposed behind the movable mold core and cooperating with the movable mold core, and two core-pulling units symmetrically disposed on the left and right sides of the movable mold core and the fixed mold core; the core-pulling unit comprises a main slider that can slide left and right, and at least one drive rod that is obliquely inserted and connected in the main slider and is parallel to each other, characterized in that: Each of the two core-pulling units is further provided with a forming module between the main slider and the fixed mold core. The two forming modules are arranged in a centrally symmetrical manner. The forming module includes a core-pulling seat fixed on the main slider near the fixed mold core, and a traction bar that slides in the up and down direction and is elastically connected between the moving mold core and the fixed mold core so as to always have an upward or downward reset movement tendency. The core-pulling seat has multiple horizontally arranged tongue-shaped core strips arranged sequentially from top to bottom in the direction of the fixed mold core. The lower outer wall of the root of each tongue-shaped core strip and the corresponding outer wall of the core-pulling seat have a horizontally arranged main slotted block in the direction of the fixed mold core, which is connected to the traction strip to drive it to move upward or downward. Each of the aforementioned traction bars is also fitted with a plurality of pins on the side near the core-pulling seat. These pins can tilt and slide elastically in the left-right direction to always have a tendency to move back towards the traction bar direction and are arranged in parallel from top to bottom. The number of pins is equal to the number of tongue-shaped core bars.

2. The core-pulling mechanism of a forklift casting mold according to claim 1, characterized in that, The outer wall of the traction bar near the core-pulling seat has traction cavities that are equal in number to the number of tongue-shaped core bars and distributed sequentially from top to bottom. The upper inner wall of each traction cavity has a first guide slope. The end of each main slotted block has a transversely arranged extension bar that does not contact the outer wall of the tongue-shaped core bar, and the upper edge of the end of each extension bar has a second guide slope that cooperates with the first guide slope.

3. The core-pulling mechanism of a forklift casting mold according to claim 1, characterized in that, The outer wall of the traction bar, near the core-pulling seat and away from the core-pulling seat, is provided with an inclined first cavity and a second cavity, respectively. An inclined guide slot is provided between the bottom surface of the first cavity and the bottom surface of the second cavity. The end of each pin near the traction bar passes through a corresponding guide slot and extends into a corresponding second cavity.

4. The core-pulling mechanism of a forklift casting mold according to claim 3, characterized in that, The outer circumferential surface of the ejector pin has a first retaining ring and a second retaining ring respectively located inside the first and second recessed cavities. The ejector pin is also fitted with a return spring located between the second retaining ring and the bottom surface of the second recessed cavity. The return spring is always in a compressed state so that the first retaining ring slides against the bottom surface of the first recessed cavity.

5. The core-pulling mechanism of a forklift casting mold according to claim 4, characterized in that, The outer diameters of the first retaining ring, the second retaining ring, and the outer diameter of the return spring facing the guide slot are all greater than the width of the guide slot, while the outer diameter of the return spring facing the second retaining ring is smaller than the outer diameter of the second retaining ring.

6. The core-pulling mechanism of a forklift casting mold according to claim 2, characterized in that, Both the moving mold core and the fixed mold core have a molding cavity assembly that is centrally symmetrically distributed on the left and right edges of their end faces. The molding cavity assembly includes multiple tongue-shaped molding cavities arranged laterally and distributed sequentially from top to bottom. The number of tongue-shaped molding cavities is equal to the number of tongue-shaped core strips. The shape and position of the tongue-shaped molding cavities are respectively matched with the shape and position of the tongue-shaped core strips.

7. The core-pulling mechanism of a forklift casting mold according to claim 6, characterized in that, The end faces of the moving mold core and the fixed mold core are each provided with two vertically distributed, left-right arranged straight grooves that cooperate with the traction bars in the two molding cavities. The front and rear sides of each traction bar are respectively slidably embedded in the two straight grooves on the same side of the moving mold core and the fixed mold core in the up-down direction.

8. The core-pulling mechanism of a forklift casting mold according to claim 7, characterized in that, On the inner wall of the lower side of the root of each of the two tongue-shaped forming cavities located on the moving mold core and the fixed mold core respectively and corresponding to each other, a first positioning cavity is provided to cooperate with the main slotting block. On the inner wall of each first positioning cavity facing the traction strip, a strip-shaped cavity is also provided between the inner wall of the side facing the traction strip and the corresponding inner wall of the adjacent straight groove, which is laterally distributed and cooperates with the extension strip.

9. The core-pulling mechanism of a forklift casting mold according to claim 8, characterized in that, Each tongue-shaped forming cavity has an inclined guide pin groove that cooperates with the ejector pin between the inner wall of the end of the cavity and the inner wall of the corresponding side of the adjacent straight groove. The end of each ejector pin away from the traction bar is movably embedded between two guide pin grooves located on the moving mold core and the fixed mold core, respectively, and corresponding to each other.

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