Core-pulling anti-backup die

Abstract

The present application relates to a kind of core-pulling anti-retreating mould, the oblique hole for being provided with for being arranged oblique mould core on the front mould, the anti-retreating structure includes the anti-retreating block being fixedly arranged on the front mould, the oblique mould core is provided with rectangular hole, the anti-retreating block includes rectangular column, the rectangular column is inserted into rectangular hole, the long side of rectangular hole is aligned with rectangular column, and the long side of rectangular hole is greater than the long side of rectangular column;When opening, oil cylinder acts, drives rectangular column to slide in rectangular hole, the anti-retreating section moves along oblique core-pulling direction under the joint action of elastic element elastic force and its gravity, until the end surface of the two far from cavity mutually adheres after passing through elastic element and pulls mould core section core-pulling.The technical scheme is used above, the anti-retreating structure of oblique mould core is combined with opening force, and by the gap that the long side of rectangular hole is greater than the long side of rectangular column and the sectional design of oblique mould core, change oblique core-pulling core-pulling timing, realize the timing control of each core-pulling component and anti-retreating effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mold, especially relates to a core-pulling anti-retraction mold. BACKGROUND

[0002] In the field of injection mold, for the plastic parts with complex reverse buckle or deep cavity structure, the demolding is usually realized through inclined core-pulling, slider core-pulling mechanism, especially when the fixed mold and the movable mold both have reverse buckles, the demolding is completed by adopting the combination of front mold inclined core-pulling and rear mold slider.

[0003] The existing scheme usually needs multiple independent driving units to control the inclined core-pulling and the secondary core-pulling, and for the plastic parts with inclined holes and reverse buckle structure on the surface, the rear mold slider needs to be controlled to pull the core first, and at the same time, the anti-retraction structure needs to be additionally arranged to prevent the inclined core-pulling from backtracking and extruding the injection molded part or causing hindrance to demolding, and the interference problem of each core-pulling assembly and the anti-retraction assembly is avoided, resulting in a large mold volume and high cost. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art, and the present application provides a core-pulling anti-retraction mold which combines the driving unit of the anti-retraction assembly and the inclined core-pulling structure to solve the problem of large volume caused by the need for each core-pulling assembly to set a driving unit to control the timing sequence and the need for the anti-retraction assembly to be additionally arranged for the inclined core-pulling.

[0005] The technical scheme of the present application is a core-pulling anti-retraction mold, which comprises an upper top plate, a water gap plate, a front mold, a rear mold, a mold foot and a lower bottom plate arranged in sequence from top to bottom, a space is formed between the rear mold, the mold foot and the lower bottom plate for arranging an ejection mechanism, an injection cavity is formed between the front mold and the rear mold after the mold is closed, an injection port is arranged on the upper top plate, the injection port is connected to the cavity through an injection runner, an inclined hole is arranged on the front mold for inserting an inclined mold core, and an anti-retraction structure is further arranged, the anti-retraction structure comprises an oil cylinder fixedly arranged on the front mold and an anti-retraction block slidingly arranged on the front mold, the output end of the oil cylinder is fixedly connected with the anti-retraction block, a rectangular hole is arranged on the inclined mold core, the anti-retraction block comprises a rectangular column, the rectangular column is inserted into the rectangular hole, the long sides of the rectangular hole are aligned with the long sides of the rectangular column, and the long sides of the rectangular hole are longer than the long sides of the rectangular column, the rectangular column is inclined towards the side close to the upper top plate and extends out, and the rectangular hole is arranged in the same direction as the rectangular column;

[0006] The inclined mold core comprises an anti-retraction section and a mold core section, the anti-retraction section and the mold core section slide relative to each other, and the anti-retraction section and the mold core section are connected through an elastic member;

[0007] The rear mold is provided with a slidingly arranged slider mold core, a transmission block is fixedly arranged at the top of the slider mold core, a pull block is arranged at the top of the transmission block, the pull block is fixed to the bottom of the front mold, and the pull block and the transmission block are both provided with inclined through holes for penetrating the same transmission rod, the top end of the transmission rod is fixedly arranged between the pull block and the bottom of the front mold, and the transmission rod body slides in the inclined through hole of the transmission block;

[0008] After the mold is closed, one end of the inclined mold core extends into the cavity, the other end abuts against the anti-backup block, the end faces of the rectangular column and the rectangular hole close to the cavity are mutually attached, and the elastic member is extruded and deformed, and one end of the slider mold core extends into the cavity;

[0009] When the mold is opened, the elastic member resets, the output end of the oil cylinder acts, drives the rectangular column to slide in the rectangular hole, the anti-backup section moves along the inclined core-pulling direction under the combined action of the elastic force of the elastic member and the gravity of the anti-backup section, and until the end faces of the two away from the cavity are mutually attached, the mold core section is pulled by the elastic member to pull the core.

[0010] By combining the anti-backup structure of the inclined mold core with the mold opening force, without adding a driving unit to the slider mold core, the timing control of each core-pulling assembly and the anti-backup effect can be realized, and by the gap between the long side of the rectangular hole and the long side of the rectangular column and the segmented design of the inclined mold core, the mold opening timing of the inclined core-pulling is changed to realize the phased core-pulling control: in the early stage of mold opening, the front mold rises to drive the pull block, the pull block pulls the transmission block upward through the transmission rod to pull the slider mold core outward, at this time, the output end of the oil cylinder is retracted, and under the action of the mold opening force, the anti-backup section of the inclined mold core moves obliquely, and one end of the elastic force of the elastic member extrudes the mold core section to the original position, and the other end pushes the anti-backup section outward together with the mold opening force, the end face of the rectangular hole close to the cavity abuts on the bottom surface of the rectangular column, the output end of the oil cylinder continues to shrink, the elastic force of the elastic member gradually decreases, the rectangular column moves in the gap between the rectangular hole under the combined action of the gravity of the elastic member and the mold core section, and the inclined mold core relatively slides in the inclined through hole of the front mold, the elastic force of the elastic member is not enough to drive the anti-backup section to act outward, but still extrudes the mold core section downward, and under the combined action of the gravity, the mold core section does not demold, but the rectangular column slides outward in the rectangular hole, continues to open the mold, the output end of the oil cylinder is retracted, the rectangular column moves relative to the anti-backup section to the retraction direction of the output end of the oil cylinder, the rectangular column slides to the end face of the rectangular hole away from the cavity, the output end of the oil cylinder is retracted, the anti-backup section is pulled outward, until the elastic member is stretched to overcome the gravity of the mold core section, and then forcibly pulls the demolding, completes the action of the inclined core-pulling, and the initial position of the anti-backup section to the stroke of pulling the mold core section, completes the core-pulling action of the slider mold core, and the timing of the core-pulling of the inclined mold core and the slider mold core is controlled under the premise of the anti-backup function of the inclined mold core.

[0011] The further setting of the present application is that the bottom of the anti-retreating section protrudes with a plug-in head along the core-pulling direction of the inclined mold core, the mold core section is provided with a plug-in slot for inserting the plug-in head, the elastic member is a telescopic spring, the elastic member is sleeved outside the plug-in head, and the two ends of the elastic member are fixedly connected with the bottom surface of the plug-in slot and the bottom surface of the anti-retreating section.

[0012] With the above further setting, the elastic member is limited to be a telescopic spring, which can generate outward pushing force on the two ends of the anti-retreating section and the mold core section after compression, and generate central pulling force on the two ends of the anti-retreating section and the mold core section after stretching, and the elastic member is protected by designing the plug-in head and the plug-in slot, so that the stability and reliability are stronger.

[0013] The further setting of the present application is that the plug-in head includes an end cap portion at the top and a plug-in portion extending downward from the end cap portion, the diameter of the end cap portion is wider than that of the plug-in portion, the two ends of the elastic member are respectively fixedly connected with the bottom surface of the plug-in slot and the bottom surface of the end cap portion, the two side end surfaces of the anti-retreating section are provided with rail slots, and the top of the mold core section protrudes with a rail block for sliding into the rail slot.

[0014] With the above further setting, the end cap portion is arranged on the plug-in head, so that the elastic member is installed below the end cap portion, the elastic member is entirely inside the plug-in slot after being inserted into the plug-in slot, and is further protected, so that the reliability of the elastic member is enhanced, and the rail slot and the rail block are arranged on the mold core section and the anti-retreating section to cooperate, so that the sliding direction of the mold core section and the anti-retreating section is further limited on the basis of the inclined through hole of the front mold, the influence of shaking or shaking on the part of the mold core section extending into the cavity is prevented, and the precision is higher.

[0015] The further setting of the present application is that the transmission rod is arranged along the direction from the front mold to the rear mold, and the bottom thereof is inclined towards the core-pulling direction of the slider mold core.

[0016] With the above further setting, the transmission rod is arranged to be inclined towards the core-pulling direction of the slider, and the transmission rod is pulled to move by the action of mold opening and closing, so that the slider mold core moves along the inclined position or the reverse position, and the core-pulling action of the slider mold core is realized.

[0017] The further setting of the present application is that the slider mold core is provided with pressing blocks on the left and right sides, the pressing blocks are fixedly arranged on the rear mold, and the pressing blocks press and fit the slider mold core on the rear mold.

[0018] With the above further setting, the slider mold core is limited to shake in the vertical direction of the rear mold, so that the shaking in the injection molding and mold opening process is avoided to prevent damage to the injection molded part.

[0019] The further further setting of the present application is that the bottom of the water gap plate is provided with a positioning block, the positioning block is in abutment with the top of the anti-back-off block, the top of the anti-back-off block is in a sharp corner structure, and the bottom of the positioning block is recessed with a groove matched with the top of the anti-back-off block.

[0020] With the above further further setting, the positioning block is fixedly arranged at the bottom of the water gap plate, and through cooperation of the sharp corner structure and the groove, accurate positioning of the anti-back-off block is ensured. In the mold closing process, even if there is slight deviation in position, the anti-back-off block can be extruded to the accurate position under the action of the side slope constituting the sharp corner, so that the accurate position of the anti-back-off block and the corresponding inclined mold core is ensured.

[0021] The further further setting of the present application is that the ejection mechanism comprises an upper ejector plate, a lower ejector plate and a plurality of ejector pins, the ejector pins comprise inclined ejector pins and vertical ejector pins, the lower ends of the ejector pins are fixedly connected with the upper ejector plate, and the upper ends of the ejector pins extend into the cavity and are in contact with the injection molded part.

[0022] With the above further further setting, the inclined and vertical ejector pins are combined to realize deep cavity reverse clamping directional demolding, the demolding can be pushed from various angles, and the plastic part is prevented from being damaged.

[0023] The further further setting of the present application is that the injection port is connected with a flow splitting device, the flow splitting device is fixedly arranged in the water gap plate, the flow splitting device comprises a plurality of output ends, the output ends of the flow splitting device pass through the front mold and extend into the cavity, waterway pipelines are arranged in the water gap plate, the front mold and the rear mold, a thermocouple wire groove is further arranged on the water gap plate for laying a thermocouple wire for detecting the temperature of the flow splitting device, and an electrical interface is arranged on the side surface of the water gap plate.

[0024] With the above further further setting, the output ends of the flow splitting device serve as injection runners, the function of simultaneous injection at multiple positions is realized, the waterway and the thermocouple for detecting the temperature are integrated on the side of the device, the temperature of injection can be accurately controlled, and the injection molding is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The specific structure schematic diagram of the embodiment of the present application is shown in the figure;

[0026] Figure 2 The overall structure schematic diagram of the present application is shown in the figure, in which the upper ejector plate and the water gap plate are hidden;

[0027] Figure 3 The structure schematic diagram of the anti-back-off structure and the flow splitting device in the mold is shown in the figure;

[0028] Figure 4 The overall structure schematic diagram of the anti-back-off structure is shown in the figure;

[0029] Figure 5The schematic view of the explosion structure of the inclined mold core in the embodiment of the present application;

[0030] Figure 6 The schematic view of the overall structure of the cross section of the inclined mold core in the embodiment of the present application;

[0031] Figure 7 The schematic view of the overall structure of the front mold in the embodiment of the present application;

[0032] Figure 8 The schematic view of the overall structure of the back mold in the embodiment of the present application;

[0033] Figure 9 The schematic view of the overall structure of the hidden upper top plate, the nozzle plate and the back mold in the embodiment of the present application;

[0034] Figure 10 The schematic view of the slide mold core and the ejection structure in the embodiment of the present application;

[0035] Figure 11 The schematic view of the cooperation of the slide mold core, the transmission block, the pull block, the transmission rod and the pressing block in the embodiment of the present application;

[0036] Figure 12 The cross-sectional view of the cooperation of the slide mold core, the transmission rod, the front mold and the back mold in the embodiment of the present application;

[0037] Figure 13 The schematic view of the structure of the hidden upper top plate in the embodiment of the present application.

[0038] In the figure: 1, upper top plate; 11, injection port; 12, flow dividing device; 2, nozzle plate; 21, positioning block; 22, thermocouple wire groove; 3, front mold; 31, inclined mold core; 311, rectangular hole; 312, anti-back-off section; 3121, plug-in head; 3122, end cap part; 3123, plug-in part; 3124, track groove; 313, mold core section; 3131, plug-in groove; 3132, track block; 314, elastic member; 32, anti-back-off block; 321, rectangular column; 33, oil cylinder; 4, back mold; 41, slide mold core; 42, transmission block; 43, pull block; 44, transmission rod; 45, pressing block; 5, mold foot; 6, bottom plate; 7, ejection mechanism; 71, upper ejector plate; 72, lower ejector plate; 73, ejector pin. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0040] It should be noted that all directional indications, such as upper, lower, front, back, and the like, used in the description of the present application are only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. In the description of the present application, the meaning of "several" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0042] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the realization of the person skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0043] As shown in Figures 1-13 A core-pulling anti-retreating die, comprising, from top to bottom, in sequence:

[0044] The upper top plate 1 is provided with a center injection port 11;

[0045] The water gap plate 2 is provided with a shunt device 12 communicating with the injection port 11, an internal thermocouple lead groove 22 and a water channel, for detecting and controlling the injection temperature in the shunt device 12, and a bottom fixed positioning block 21;

[0046] The front die 3 is provided with a slanting through hole for setting a slanting die core 31, a bottom fixed pull block 43, and an anti-retreating structure at the top, the anti-retreating structure comprising an anti-retreating block 32 and an oil cylinder 33, the oil cylinder 33 being fixedly arranged on the front die 3, and the output end of the oil cylinder 33 controlling the sliding of the anti-retreating block 32 on the front die 3, wherein the slanting through hole, the slanting die core 31 and the anti-retreating structure can be provided with multiple groups, according to the specific molded part, two groups are selected in the present embodiment;

[0047] The inclined mold core 31 comprises a retreat prevention section 312 and a mold core section 313 which are detachably arranged in a split body mode, slide relative to each other, and are connected through an elastic member 314 which can be selected as an extension spring. The retreat prevention section 312 is protruded with a plug joint 3121 at the bottom along the core pulling direction of the inclined mold core 31. The plug joint 3121 comprises an end cap portion 3122 at the top and a plug joint portion 3123 extending downward from the end cap portion 3122. Both the end cap portion 3122 and the plug joint portion 3123 are in a cylindrical structure, the diameter of the end cap portion 3122 is wider than that of the plug joint portion 3123. The elastic member 314 is sleeved outside the plug joint portion 3123, and both ends of the elastic member 314 are fixedly connected with the bottom surface of the plug joint groove 3131 and the bottom surface of the end cap portion 3122 respectively.

[0048] The rear mold 4 is provided with the slide block mold core 41 on the surface and slides. In the embodiment, one slide block mold core 41 is arranged on each of the left and right sides of the rear mold 4 close to the end face of the front mold 3. The specific number can be increased according to the structure of the molded part. The slide block mold core 41 is provided with a pressing block 45 on both sides. The slide block mold core 41 is provided with an edge protrusion on both sides. The pressing block 45 covers the upper part of both sides of the slide block mold core 41 and is fixed to the rear mold 4 through bolts to limit the vertical displacement of the slide block mold core 41.

[0049] Meanwhile, the front mold 3 and the rear mold 4 form a mold cavity after clamping. The output end of the flow dividing device 12 extends into the mold cavity.

[0050] The mold foot 5 and the lower bottom plate 6 accommodate the ejection mechanism 7 therebetween. The ejection mechanism 7 comprises an upper ejector plate 71, a lower ejector plate 72 and an ejector pin 73. The ejector pin 73 comprises vertical ejector pins and inclined ejector pins for pushing the injection molded part out of the mold from different angles to realize directional ejection of the injection molded part with a deep cavity and reverse locking structure.

[0051] The inclined mold core 31 is provided with a rectangular hole 311. The retreat prevention block 32 comprises a rectangular column 321 which is inclined to extend towards the side close to the upper plate 1. The rectangular hole 311 is arranged along the same direction as the rectangular column 321. The rectangular column 321 is inserted into the rectangular hole 311. The side of the rectangular column 321 corresponding to the long side of the rectangular hole 311 is aligned, and the long side of the rectangular hole 311 is greater than the long side of the rectangular column 321. The long side of the rectangular hole 311 is parallel to the core pulling direction of the inclined mold core 31, and the short side is perpendicular to the core pulling direction of the inclined mold core 31.

[0052] The working process of the retreat prevention structure: in the clamped state, the bottom of the mold core section 313 of the inclined mold core 31 extends into the mold cavity. The end face of the retreat prevention section 312 close to the mold cavity is in contact with the rectangular column 321 of the retreat prevention block 32 through the rectangular hole 311. The elastic member 314 is deformed by being pressed by the retreat prevention section 312. At the same time, the sharp corner top of the retreat prevention block 32 is clamped by the groove of the positioning block 21. One end of the slide block mold core 41 extends into the mold cavity.

[0053] At the beginning of the mold opening, the front mold 3 moves up, the output end of the oil cylinder 33 contracts, the mold core segment 313 is pressed by the elastic element 314 and stays in place, the anti-backup segment 312 is tightly attached to the end face of the rectangular column 321 close to the cavity and moves together in the direction away from the cavity,

[0054] At the middle of the mold opening, the output end of the oil cylinder 33 continues to contract, the rectangular column 321 moves in the gap in the rectangular hole 311, at this time the elastic element 314 is about to reset, and the inclined mold core 31 slides in the inclined hole of the front mold 3, the elastic force of the elastic element 314 is not enough to push the anti-backup segment 312 to move outward, but it still presses the mold core segment 313 downward, and under the joint action of gravity, the mold core segment 313 does not demold, and the rectangular column 321 slides outward in the rectangular hole 311;

[0055] At the late stage of the mold opening, the rectangular column 321 slides to the end face of the rectangular hole 311 away from the cavity, the output end of the oil cylinder 33 contracts, pulls the anti-backup segment 312 to move outward until the elastic element 314 is stretched to overcome the gravity of the mold core segment 313, and then forcibly pulls the demolding, completing the action of inclined core pulling.

[0056] The action process of the sliding block mold core 41 linkage mechanism: after the mold is opened, the front mold 3 moves up to lift the pull block 43, the pull block 43 pushes the transmission block 42 through the inclined transmission rod 44, and the transmission block 42 drives the sliding block mold core 41 to move horizontally along the track limited by the pressing block 45;

[0057] It should be noted that the core pulling of the sliding block mold core 41 is started synchronously with the opening of the front mold, and does not need to be provided with an independent oil cylinder, and the core pulling of the sliding block mold core 41 starts at the beginning of the mold opening, that is, at the middle of the mold opening, the core pulling of the sliding block mold core 41 is completed, and the control of the first and second demolding is realized.

[0058] Auxiliary structure: pressing block 45, which restricts the sliding of the sliding block mold core 41 on the surface of the rear mold 4 to avoid shaking in the vertical direction, and can prevent position deviation after the mold closing, leading to flash of the injection molded part. Similarly, as shown in the accompanying drawings, the pressing block 45 can also be provided on both sides of the anti-backup block 32 to restrict the sliding of the anti-backup block 32 on the surface of the front mold 3; Figure 4

[0059] Positioning block 21, fixedly arranged at the bottom of the water gap plate 2, the positioning block 21 abuts against the top of the anti-backup block 32, the top of the anti-backup block 32 is provided with a sharp corner structure, and the bottom of the positioning block 21 is recessed with a groove matched with the top of the anti-backup block 32, through the cooperation of the sharp corner structure and the groove, the accurate positioning of the anti-backup block 32 is ensured, and even if there is slight deviation in the position during the mold closing, the anti-backup block 32 can be pressed to the accurate position under the action of the side slope of the sharp corner, ensuring the accurate position of the anti-backup block 32 and the corresponding inclined mold core 31;

[0060] Ejection mechanism 7, in which the inclined ejector pin 73 can eject the deep cavity reverse buckling area, and the vertical ejector pin 73 pushes the main structure;​

[0061] The temperature control system, in the embodiment, the shunt device 12 is preferably provided with four output ends, and the output ends are provided with hollow pipes for passing the injection plastics, and the output ends are all inserted into the cavity to realize synchronous injection, and the thermocouples and water pipes arranged around the output ends can detect and control the temperature of the injection plastics.

[0062] Specifically, in the embodiment, the rectangular hole and the rectangular column structure realize anti-retreat locking and phased core pulling control, and an independent anti-retreat unit is omitted, and the transmission rod 44 converts the opening movement of the front mold into the core pulling of the rear mold slide block, so as to ensure that the rear mold moves preferentially.

Claims

1. A core-pulling anti-retraction mold, comprising, from top to bottom, an upper top plate (1), a sprue plate (2), a front mold (3), a rear mold (4), a mold foot (5), and a lower bottom plate (6), wherein a space is formed between the rear mold (4), the mold foot (5), and the lower bottom plate (6) for setting an ejection mechanism (7), and an injection cavity is formed between the front mold (3) and the rear mold (4) after mold closing, wherein the upper top plate (1) is provided with an injection port (11), the injection port (11) is connected to the cavity through an injection runner, and the front mold (3) is provided with an oblique through hole for inserting an oblique mold core (31), characterized in that, It also includes an anti-retraction structure, which includes a hydraulic cylinder (33) fixedly mounted on the front mold (3) and an anti-retraction block (32) slidably mounted on the front mold (3). The output end of the hydraulic cylinder (33) is fixedly connected to the anti-retraction block (32). A rectangular hole (311) is provided on the inclined mold core (31). The anti-retraction block (32) includes a rectangular column (321). The rectangular column (321) is inserted into the rectangular hole (311). The long side of the rectangular column (321) is aligned with the long side of the rectangular hole (311), and the long side of the rectangular hole (311) is greater than the long side of the rectangular column (321). The inclined mold core (31) includes an anti-retraction section (312) and a mold core section (313), which are slidably arranged relative to each other, and are connected by an elastic element (314). The rear mold (4) is provided with a sliding block core (41), and a transmission block (42) is fixedly provided on the top of the sliding block core (41). A pull block (43) is provided on the top of the transmission block (42). The pull block (43) is fixed to the bottom of the front mold (3). Both the pull block (43) and the transmission block (42) are provided with oblique through holes for passing through the same transmission rod (44). The top of the transmission rod (44) is fixedly provided between the pull block (43) and the bottom of the front mold (3). The rod body of the transmission rod (44) slides in the oblique through hole of the transmission block (42). After the mold is closed, one end of the inclined mold core (31) extends into the cavity and the other end abuts against the anti-retraction block (32). The rectangular column (321) and the rectangular hole (311) are close to the end face of the cavity and fit together. The elastic element (314) is squeezed and deformed, and one end of the slider mold core (41) extends into the cavity. When the mold is opened, the elastic element (314) resets and the output end of the oil cylinder (33) moves, driving the rectangular column (321) to slide in the rectangular hole (311). The anti-retraction section (312) moves along the oblique core-pulling direction under the combined action of the elastic force of the elastic element (314) and its own gravity until the end faces away from the cavity are in contact with each other, and then the core section (313) is pulled out by the elastic element (314).

2. The core-pulling anti-retraction mold according to claim 1, characterized in that, The bottom of the anti-retraction section (312) has a protruding connector (3121) along the core-pulling direction of the inclined mold core (31). The mold core section (313) is provided with a plug groove (3131) for inserting the connector (3121). The elastic element (314) is a telescopic spring. The elastic element (314) is sleeved on the outside of the connector (3121). The two ends of the elastic element (314) are fixedly connected to the bottom surface of the plug groove (3131) and the bottom surface of the anti-retraction section (312), respectively.

3. The core-pulling anti-retraction mold according to claim 2, characterized in that, The connector (3121) includes an end cap (3122) at the top and a plug portion (3123) extending downward from the end cap (3122). The two ends of the elastic member (314) are respectively connected to the bottom surface of the plug groove (3131) and the bottom surface of the end cap (3122). Track grooves (3124) are provided on both end faces of the anti-retraction section (312). The top of the core section (313) has a track block (3132) for sliding inside the track groove (3124).

4. The core-pulling anti-retraction mold according to claim 1, characterized in that, The transmission rod (44) is arranged along the direction from the front mold (3) to the rear mold (4), and its bottom is inclined toward the core-pulling direction of the slider mold core (41).

5. A core-pulling anti-retraction mold according to claim 1 or 4, characterized in that, The slider mold core (41) is provided with pressure blocks (45) on the left and right sides. The pressure blocks (45) are fixedly set with the rear mold (4). The pressure blocks (45) press the slider mold core (41) onto the rear mold (4).

6. The core-pulling anti-retraction mold according to claim 1, characterized in that, The bottom of the sprue plate (2) is provided with a positioning block (21), which abuts against the top of the anti-retraction block (32). The top of the anti-retraction block (32) has a pointed structure, and the bottom of the positioning block (21) has a groove that fits against the top of the anti-retraction block (32).

7. The core-pulling anti-retraction mold according to claim 1, characterized in that, The ejection mechanism (7) includes an upper ejector plate (71), a lower ejector plate (72), and a number of ejector pins (73). The ejector pins (73) include oblique ejector pins and vertical ejector pins. The lower end of the ejector pin (73) is fixedly connected to the upper ejector plate (71), and the upper end of the ejector pin (73) extends into the cavity and contacts the injection molded part.

8. The core-pulling anti-retraction mold according to claim 1, characterized in that, The injection port (11) is connected to a flow divider (12), which is fixedly installed in the sprue plate (2). The flow divider (12) includes several output ends, and the output ends of the flow divider (12) extend through the front mold (3) into the cavity.

9. A core-pulling anti-retraction mold according to claim 8, characterized in that, Water pipes are installed in the sprue plate (2), the front mold (3) and the rear mold (4). The sprue plate (2) is also provided with a thermocouple wire groove (22) for laying thermocouple wires for detecting the temperature of the diversion device (12). The thermocouple wires are provided with electrical interfaces on the side of the sprue plate (2).

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