Core-pulling anti-retreating mold

Abstract

An inclined through hole is formed in a front mold and used for allowing an inclined mold core to penetrate through, an anti-retreat structure comprises an anti-retreat block fixedly arranged on the front mold, a rectangular hole is formed in the inclined mold core, the anti-retreat block comprises a rectangular column, the rectangular column is inserted into the rectangular hole, and the rectangular column is inserted into the rectangular hole. The rectangular columns are aligned with the long sides of the rectangular holes, and the long sides of the rectangular holes are larger than the long sides of the rectangular columns; when the mold is opened, the oil cylinder acts to drive the rectangular column to slide in the rectangular hole, the anti-retreating section moves in the oblique core pulling direction under the combined action of the elastic force of the elastic piece and the gravity of the anti-retreating section till the end faces, away from the cavity, of the anti-retreating section and the mold core section are attached to each other, and then the mold core section is pulled through the elastic piece for core pulling. By the adoption of the technical scheme, an anti-retreating structure of the inclined mold core is combined with mold opening force, the mold pulling opportunity of inclined core pulling is changed through the gap that the long edge of the rectangular hole is larger than the long edge of the rectangular column and the segmented design of the inclined mold core, and the sequential control and anti-retreating effects of all the core pulling assemblies are achieved.

Description

Technical Field

[0001] This invention belongs to the field of mold technology, and in particular relates to a core-pulling anti-retraction mold. Background Technology

[0002] In the field of injection molds, for plastic parts with complex undercuts or deep cavity structures, demolding is usually achieved through mechanisms such as inclined core pulling or slider core pulling. In particular, when both the fixed mold and the moving mold have undercuts, a combination of inclined core pulling of the front mold and slider of the rear mold is required to complete the demolding.

[0003] Existing solutions typically require multiple independent drive units to control the angled core pulling and secondary core pulling separately. For existing plastic parts with angled holes and undercut structures on the surface, it is necessary to control the rear mold slider to pull the core first, and at the same time, an anti-retraction structure needs to be added to prevent the angled core pulling from retracting and squeezing the injection molded part or obstructing demolding. The various core pulling components and anti-retraction components should avoid interference, resulting in a large mold volume and high cost. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a core-pulling anti-retraction mold that combines an anti-retraction component and a drive unit for an inclined core-pulling structure. This solves the problems of each core-pulling component needing its own drive unit to control the timing and the large size caused by the need to add an anti-retraction component for inclined core-pulling.

[0005] The technical solution of the present invention: A core-pulling anti-retraction mold includes an upper top plate, a sprue plate, a front mold, a rear mold, a mold foot, and a lower base plate arranged sequentially from top to bottom. A space is formed between the rear mold, the mold foot, and the lower base plate for setting an ejection mechanism. An injection cavity is formed between the front mold and the rear mold after mold closing. An injection port is provided on the upper top plate, and the injection port is connected to the cavity through an injection runner. An oblique through hole is provided on the front mold for inserting an oblique mold core. The mold also includes an anti-retraction structure, which includes a hydraulic cylinder fixedly set on the front mold and an anti-retraction block slidably set on the front mold. The output end of the hydraulic cylinder is fixedly connected to the anti-retraction block. A rectangular hole is provided on the oblique mold core. The anti-retraction block includes a rectangular post, which is inserted into the rectangular hole. The long side of the rectangular post is aligned with the long side of the rectangular hole, and the long side of the rectangular hole is greater than the long side of the rectangular post. The rectangular post extends obliquely towards the side closer to the upper top plate, and the rectangular hole extends in the same direction as the rectangular post. The inclined mold core includes an anti-retraction section and a mold core section, which slide relative to each other and are connected by an elastic element. The rear mold is provided with a sliding slider core, the top of the slider core is fixedly provided with a transmission block, the top of the transmission block is provided with a pull block, the pull block is fixed to the bottom of the front mold, the pull block and the transmission block are both provided with oblique through holes for passing through the same transmission rod, the top of the transmission rod is fixedly provided between the pull block and the bottom of the front mold, and the body of the transmission rod slides in the oblique through hole of the transmission block; After the mold is closed, one end of the inclined mold core extends into the cavity and the other end abuts against the anti-retraction block. The rectangular column and the rectangular hole close to the cavity end face fit together. The elastic element is extruded and deformed, and one end of the slider mold core extends into the cavity. When the mold is opened, the elastic element resets and the output end of the hydraulic cylinder moves, causing the rectangular column to slide within the rectangular hole. The anti-retraction section moves along the oblique core-pulling direction under the combined action of the elastic force of the elastic element and its own gravity until the end faces away from the cavity are in contact with each other, and then the core section is pulled out by the elastic element.

[0006] By adopting the above technical solution, the anti-retraction structure of the inclined mold core is combined with the mold opening force. This eliminates the need for an additional drive unit on the slider mold core, achieving timing control and anti-retraction functions for each core-pulling component. Furthermore, by using a gap where the long side of the rectangular hole is larger than the long side of the rectangular column, and by employing a segmented design for the inclined mold core, the timing of the inclined core pulling is altered, enabling staged core pulling control: In the initial mold opening stage: the front mold rises, driving the pull block. The pull block, through a transmission rod, pulls the transmission block upwards, causing the slider mold core to pull outwards. At this time, the hydraulic cylinder releases and retracts its output end. Under the action of the mold opening force, the anti-retraction section of the inclined mold core moves obliquely. Simultaneously, one end of the elastic element presses the mold core section in place, while the other end, together with the mold opening force, pushes the anti-retraction section outwards. The end face of the rectangular hole near the cavity abuts against the bottom surface of the rectangular column. The output end of the hydraulic cylinder continues to contract, and the elastic force of the elastic element gradually decreases. Under the combined action of the elastic element and the gravity of the mold core section... The rectangular column moves within the gap in the rectangular hole, while the inclined mold core slides relative to it in the inclined through hole of the front mold. The elastic force of the elastic element is insufficient to push the anti-retraction section outward, but it still presses the mold core section downward. Under the combined action of gravity, the mold core section does not demold, while the rectangular column slides outward within the rectangular hole, continuing to open the mold. The output end of the hydraulic cylinder retracts, and the rectangular column moves relative to the anti-retraction section in the direction of retraction from the output end of the hydraulic cylinder. The rectangular column slides until it is in contact with the end face of the rectangular hole away from the cavity. The output end of the hydraulic cylinder contracts, pulling the anti-retraction section outward until the elastic element is stretched to overcome the gravity of the mold core section. Then, it is forcibly pulled to demold, completing the inclined core pulling action. Finally, the initial position of the anti-retraction section is in the stroke of pulling the mold core section, completing the core pulling action of the slider mold core. This allows the core pulling sequence of the inclined mold core and the slider mold core to be controlled while the inclined mold core has an anti-retraction function.

[0007] A further feature of the present invention is that: a plug protrudes from the bottom of the anti-retraction section along the direction of core pulling of the inclined mold core; a plug groove for inserting the plug is provided on the mold core section; the elastic element is a telescopic spring; the elastic element is sleeved on the outside of the plug; and the two ends of the elastic element are fixedly connected to the bottom surface of the plug groove and the bottom surface of the anti-retraction section, respectively.

[0008] With the above-mentioned further configuration, the elastic element is limited to a telescopic spring. When compressed, it can generate an outward pushing force on the anti-retraction section and the core section at both ends. When stretched, it can generate a center-to-center pulling force on the anti-retraction section and the core section at both ends. The elastic element is protected by the design of the plug and plug groove, which makes its stability and reliability stronger.

[0009] A further feature of the present invention is that the connector includes an end cap at the top and a plug portion extending downward from the end cap. The diameter of the end cap is wider than that of the plug portion. The two ends of the elastic member are respectively connected to the bottom surface of the plug groove and the bottom surface of the end cap. Track grooves are provided on both end faces of the anti-retraction section. A track block for sliding inside the track groove protrudes from the top of the mold core section.

[0010] With the above-mentioned further configuration, an end cap is provided on the connector, so that the elastic element is installed below the end cap. After the end cap is inserted into the connector groove, the elastic element is completely inside the connector groove, which further protects it and enhances the reliability of the elastic element. At the same time, the mold core section and the anti-retraction section are equipped with track grooves and track blocks to cooperate, further limiting the sliding direction of the mold core section and the anti-retraction section on the basis of the oblique through hole of the front mold, preventing vibration or shaking from affecting the part of the mold core section that extends into the cavity, resulting in higher precision.

[0011] A further feature of the present invention is that the transmission rod is arranged along the direction from the front mold to the rear mold, and its bottom is inclined toward the core-pulling direction of the slider mold core.

[0012] With the above further configuration, the transmission rod is inclined in the direction of the slider core pulling. The opening and closing of the mold pulls the transmission rod, so that the slider core moves in the inclined direction or in the opposite direction, thus realizing the core pulling action of the slider core.

[0013] A further feature of the present invention is that pressure blocks are provided on the left and right sides of the slider mold core, the pressure blocks are fixedly disposed with the rear mold, and the pressure blocks press the slider mold core against the rear mold.

[0014] By adopting the above-mentioned further settings, the movement of the slider core in the direction perpendicular to the rear mold is restricted, so as to avoid the vibration during injection and mold opening process causing wear and damage to the injection molded parts.

[0015] A further feature of the present invention is that a positioning block is provided at the bottom of the sprue plate, the positioning block abuts against the top of the anti-retraction block, the top of the anti-retraction block has a pointed structure, and the bottom of the positioning block has a recessed groove that fits with the top of the anti-retraction block.

[0016] With the above-mentioned further configuration, the positioning block is fixedly set at the bottom of the sprue plate. Through the cooperation of the squeaking structure and the groove, the precise positioning of the anti-retraction block is ensured. During the mold closing process, even if there is a slight deviation in position, it can be squeezed to the precise position under the action of the side slope that constitutes the squeaking, thus ensuring the accurate position of the anti-retraction block and the corresponding inclined mold core.

[0017] A further embodiment of the present invention includes: the ejection mechanism comprising an upper ejector plate, a lower ejector plate, and a plurality of ejector pins, wherein the ejector pins include oblique ejector pins and vertical ejector pins, the lower end of the ejector pins is fixedly connected to the upper ejector plate, and the upper end of the ejector pins extends into the cavity and contacts the injection molded part.

[0018] By further configuring the above-mentioned features, a combination of inclined and vertical ejector pins is used to achieve deep cavity undercut directional demolding, which can push the demolding from various angles to prevent damage to the plastic parts.

[0019] A further embodiment of the present invention includes: a flow divider connected to the injection port, the flow divider being fixedly installed in the sprue plate, the flow divider including a plurality of output ends, the output ends of the flow divider extending through the front mold into the cavity, water pipes being provided in the sprue plate, the front mold, and the rear mold, and a thermocouple wire groove being provided on the sprue plate for laying thermocouple wires for detecting the temperature of the flow divider, the thermocouple wires having an electrical interface on the side of the sprue plate.

[0020] With the above-mentioned further configuration, the output end of the diversion device serves as the injection molding channel, enabling simultaneous injection at multiple locations. Furthermore, the device integrates a water circuit and a thermocouple for temperature detection on its side, allowing for precise control of the injection molding temperature and ensuring successful injection molding. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure after concealing the top plate and the sprue plate in a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the anti-retraction structure and the diversion device in the mold in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the overall structure of the anti-retraction structure in a specific embodiment of the present invention; Figure 5 This is an exploded view of the inclined mold core in a specific embodiment of the present invention; Figure 6This is a schematic diagram of the overall cross-sectional structure of the inclined mold core in a specific embodiment of the present invention; Figure 7 This is a schematic diagram of the overall structure of the front mold in a specific embodiment of the present invention; Figure 8 This is a schematic diagram of the overall structure of the rear mold in a specific embodiment of the present invention; Figure 9 This is a schematic diagram of the overall structure after the top plate, sprue plate, and front mold are hidden in a specific embodiment of the present invention; Figure 10 This is a schematic diagram of the slider mold core and ejection structure in a specific embodiment of the present invention; Figure 11 This is a schematic diagram showing the cooperation of the slider mold core, transmission block, pull block, transmission rod and pressure block in a specific embodiment of the present invention; Figure 12 This is a cross-sectional view of the sliding mold core, transmission rod, front mold, and rear mold assembly in a specific embodiment of the present invention. Figure 13 This is a schematic diagram of the structure of the hidden top plate in a specific embodiment of the present invention.

[0022] In the diagram: 1. Top plate; 11. Injection port; 12. Diverter; 2. Sprue plate; 21. Positioning block; 22. Thermocouple wire groove; 3. Front mold; 31. Angled mold core; 311. Rectangular hole; 312. Anti-retraction section; 3121. Plug connector; 3122. End cap; 3123. Plug connector; 3124. Track groove; 313. Mold core section; 3131. Plug connector groove; 3132. Track block; 314. Elastic element; 32. Anti-retraction block; 321. Rectangular column; 33. Hydraulic cylinder; 4. Rear mold; 41. Sliding mold core; 42. Transmission block; 43. Pull block; 44. Transmission rod; 45. Pressure block; 5. Mold foot; 6. Base plate; 7. Ejection mechanism; 71. Upper ejector plate; 72. Lower ejector plate; 73. Ejector pin. Detailed Implementation

[0023] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that in the description of this invention, all directional indications (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] Furthermore, in this invention, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0027] like Figure 1-13 As shown, a core-pulling anti-retraction mold includes the following components arranged from top to bottom: Top plate 1: Centered injection port 11; Sprue plate 2: It is equipped with a flow divider 12 connected to the injection port 11, and has a thermocouple wire groove 22 and water pipe inside for detecting and controlling the injection temperature inside the flow divider 12. A positioning block 21 is fixedly installed at the bottom. Front mold 3: It is provided with an oblique through hole through which the oblique mold core 31 passes, a pull block 43 is fixed at the bottom, and an anti-retraction structure is provided at the top. The anti-retraction structure includes an anti-retraction block 32 and a hydraulic cylinder 33. The hydraulic cylinder 33 is fixedly set on the front mold 3. The output end of the hydraulic cylinder 33 controls the anti-retraction block 32 to slide on the front mold 3. Multiple sets of oblique through holes, oblique mold core 31 and anti-retraction structure can be set according to the specific molded part. In this embodiment, two sets are selected. The inclined mold core 31 includes a detachable anti-retraction section 312 and a mold core section 313, which slide relative to each other and are connected by an elastic element 314. The elastic element 314 can be a telescopic spring. The bottom of the anti-retraction section 312 has a plug 3121 protruding along the core-pulling direction of the inclined mold core 31. The plug 3121 includes an end cap 3122 at the top and a plug portion 3123 extending downward from the end cap 3122. Both the end cap 3122 and the plug portion 3123 are cylindrical structures, and the diameter of the end cap 3122 is wider than that of the plug portion 3123. The elastic element 314 is sleeved on the outside of the plug portion 3123, and 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 end cap 3122, respectively. Rear mold 4: A slider mold core 41 is slidably disposed on the surface. In this embodiment, a slider mold core 41 is disposed on each of the left and right sides of the rear mold 4 near the end face of the front mold 3. The specific number can be increased according to the structure of the molded part. Pressure blocks 45 are disposed on both sides of the slider mold core 41. Edge protrusions are provided on both sides of the slider mold core 41. The pressure blocks 45 cover the upper part of both sides of the slider mold core 41 and are fixed to the rear mold 4 by bolts to restrict the vertical displacement of the slider mold core 41. At the same time, after the front mold 3 and the rear mold 4 are closed, a cavity is formed, and the output end of the flow divider 12 extends into the cavity; The mold base 5 and the lower base plate 6 are used to accommodate the ejection mechanism 7. The ejection mechanism 7 includes an upper ejector plate 71, a lower ejector plate 72 and ejector pins 73. The ejector pins 73 include vertical ejector pins and angled ejector pins, which are used to push the injection molded part out of the mold from different angles to achieve directional demolding of the deep cavity undercut structure injection molded part.

[0028] The inclined mold core 31 is provided with a rectangular hole 311, and the anti-retraction block 32 includes a rectangular post 321. The rectangular post 321 extends inclined towards the side close to the upper top plate 1. The rectangular hole 311 extends in the same direction as the rectangular post 321. The rectangular post 321 is inserted into the rectangular hole 311. The side of the rectangular post 321 is aligned with the side of the long side of the rectangular hole 311, and the long side of the rectangular hole 311 is larger than the long side of the rectangular post 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. Working process of the anti-retraction structure: In the mold closed state, the bottom of the mold core section 313 of the inclined mold core 31 extends into the cavity, and the anti-retraction section 312 is in contact with the rectangular post 321 of the anti-retraction block 32 through the rectangular hole 311 near the cavity end face. The anti-retraction section 312 compresses the elastic element 314 to deform, and at the same time, the groove of the positioning block 21 clamps the top of the sharp corner of the anti-retraction block 32, and one end of the slider mold core 41 extends into the cavity.

[0029] In the initial stage of mold opening, the front mold 3 moves upward, the output end of the hydraulic cylinder 33 contracts, and the mold core section 313 is pressed into place by the elastic element 314. The anti-retraction section 312 moves together with the end face of the rectangular column 321 near the cavity, moving obliquely away from the cavity. In the middle of mold opening, the output end of the hydraulic cylinder 33 continues to contract, and the rectangular column 321 moves in the gap within the rectangular hole 311. At this time, the elastic element 314 is about to reset, and the inclined mold core 31 slides relative to the inclined through hole of the front mold 3. The elastic force of the elastic element 314 is insufficient to push the anti-retraction section 312 outward, but it still presses the mold core section 313 downward. Under the combined action of gravity, the mold core section 313 does not demold, while the rectangular column 321 slides outward within the rectangular hole 311. In the later stage of mold opening, the rectangular column 321 slides to fit against the end face of the rectangular hole 311 away from the cavity, the output end of the hydraulic cylinder 33 retracts, and pulls the anti-retraction section 312 outward until the elastic element 314 is stretched to overcome the gravity of the mold core section 313, and then forcibly pulls out of the mold to complete the oblique core pulling action.

[0030] Action process of the linkage mechanism of slider mold core 41: After the mold is opened, the front mold 3 moves up and drives the pull block 43 to rise. The pull block 43 pushes the transmission block 42 through the inclined transmission rod 44. The transmission block 42 drives the slider mold core 41 to pull the core horizontally along the trajectory limited by the pressure block 45. It should be noted that the core pulling of the slider mold core 41 starts synchronously with the opening of the front mold, eliminating the need for a separate hydraulic cylinder. Furthermore, the core pulling action of the slider mold core 41 begins in the early stage of mold opening, that is, in the middle of mold opening, the core pulling of the slider mold core 41 is completed, thus achieving sequential demolding control.

[0031] Auxiliary structure: Pressure block 45, constrains the sliding block core 41 to slide on the surface of the rear mold 4, avoiding vertical wobbling and preventing positional deviation after mold closing, which could lead to flash on the injection molded parts. Similarly, as shown in the attached... Figure 4 As shown, pressure blocks 45 can also be provided on both sides of the anti-retraction block 32 to constrain the anti-retraction block 32 to slide only on the surface of the front mold 3; Positioning block 21 is fixedly installed at the bottom of sprue plate 2. Positioning block 21 abuts against the top of anti-retraction block 32. The top of anti-retraction block 32 has a pointed structure. The bottom of positioning block 21 has a groove that fits with the top of anti-retraction block 32. Through the cooperation of the squeezing structure and the groove, the precise positioning of anti-retraction block 32 is ensured. During the mold closing process, even if there is a slight deviation in position, it can be squeezed to the precise position under the action of the side slope that constitutes squeezing, thus ensuring the accurate position of anti-retraction block 32 and corresponding inclined mold core 31. The ejection mechanism 7 includes an inclined ejector pin 73 that can eject the deep cavity inverted area, and a vertical ejector pin 73 that pushes the main structure. In this embodiment, the flow distribution device 12 preferably has four output ends, and each output end has a hollow pipe for the injection plastic to pass through. All output ends extend into the mold cavity to achieve synchronous injection. Thermocouples and water circuits are arranged around it to detect and control the temperature of the injection plastic.

[0032] Specifically, in this embodiment, the rectangular hole and rectangular column structure realize anti-retraction locking and staged core pulling control, eliminating the need for an independent anti-retraction unit. At the same time, the transmission rod 44 converts the front mold opening motion into the rear mold slider core pulling, ensuring that the rear mold moves first.

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).

Images