core-pulling structure

Abstract

This application relates to the field of injection mold technology, and more particularly to a core-pulling structure, including a base plate, a first sliding assembly, a second sliding assembly, a driving component, and a limiting assembly. The first sliding assembly includes a first slider and a core-pulling block. The second sliding assembly includes a second slider, a fixed block, and a movable insert. The second slider is slidably disposed on the base plate along a first direction, and the fixed block is fixed to the second slider. The core-pulling block drives the movable insert to move, so that the movable insert is first demolded from the position of the product with an undercut design. After the first slider moves a certain distance, the limiting component gradually changes from an extended state to a retracted state from the pressure plate, thereby releasing the limiting component's limiting effect on the stop block. This allows the first slider to drive the stop block to move, causing the second slider and the fixed block to separate from the product, achieving two-stage separation of the mold and thus improving the problem of inconvenient demolding of products with undercut designs.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and in particular to a core-pulling structure. Background Technology

[0002] With the increasing popularity of personalized and fashionable electronic products in the market, the novelty of product appearance and the complexity of its structure have also reached new heights, which places higher demands on mold design. For some products with complex internal structures, there are often undercuts or other structures inside or on the outer periphery. These undercuts can affect the separation of the product from the mold, causing difficulties in demolding. Summary of the Invention

[0003] In view of this, this application provides a core-pulling structure that can improve the problem of inconvenient demolding of products with undercut designs.

[0004] This application provides a core-pulling structure, including a base plate, a first sliding assembly, a second sliding assembly, a driving member, and a limiting assembly. The first sliding assembly includes a first slider and a core-pulling block fixed to the first slider. The first slider is slidably disposed on the base plate along a first direction. The second sliding assembly includes a second slider, a fixed block, and a movable insert. The second slider is slidably disposed on the base plate along the first direction. The fixed block is fixed to the second slider. The movable insert is configured to extend into the fixed block and be driven by the core-pulling block to slide relative to the second slider, thereby forming the core of the product's undercut structure. The driving member is connected to the first slider to drive the first slider to move along the first direction. The limiting assembly includes a pressure plate, a stop block, and a limiting member. The pressure plate is fixedly disposed relative to the base plate. The stop block is fixedly connected to the second slider and slides on the surface of the pressure plate along the first direction. The limiting member is slidably disposed on the pressure plate and is driven by the first slider to have a first state and a second state. When the limiting member is in the first state, the limiting member extends out of the pressure plate to fix the relative position of the stop and the pressure plate; when the limiting member is in the second state, the limiting member retracts into the pressure plate to release the position restriction on the stop, so that the first slider can drive the stop to move.

[0005] This core-pulling structure controls the movement of the second sliding component through a limiting component, so that the driving component first drives the first sliding component to move, allowing the undercut design of the product to be demolded first, and then the entire mold separates from the product, thereby improving the problem of inconvenient demolding of products with undercut designs. Both the first and second sliders are slidably mounted on the base plate along a first direction, while the pressure plate is fixed relative to the base plate. The stop block is fixed to the second slider, and the driving component connects to and drives the first slider. At this time, the limiting component is in the extended position of the pressure plate, used to fix the relative position of the stop block and the pressure plate, so that the second slider is temporarily fixed relative to the base plate; the core-pulling block drives the movable insert to move, so that the movable insert and the undercut design of the product are demolded first. After the first slider moves a certain distance, the limiting component gradually changes from the extended position of the pressure plate to the retracted position of the pressure plate, releasing the limiting effect of the limiting component on the stop block, thereby allowing the first slider to drive the stop block to move, causing the second slider and the fixed block to separate from the product, realizing the two-stage separation of the mold, thus improving the problem of inconvenient demolding of products with undercut designs.

[0006] In at least one embodiment, the stop block is provided with a limiting groove, the pressure plate is provided with a sliding groove, the limiting member slides in the sliding groove, and the limiting member can be driven by the first slider to extend into or disengage from the limiting groove.

[0007] In this core-pulling structure, a limiting groove is set in the stop block and a sliding groove is set in the pressure plate, and the limiting member slides in the sliding groove. Compared with the driving member directly driving the limiting member in related technologies, the limiting member in this application is driven by the first slider, thereby extending into or out of the limiting groove to realize the limiting function. This reduces the space occupied by the limiting component in the entire extended core-pulling structure, making the structure compact, improving the space utilization of the entire mold, and greatly reducing the mold opening cost.

[0008] In at least one embodiment, the side of the first slider is provided with a drive groove, the drive groove having a straight section and an inclined section that gradually narrows toward the straight section; the limiting member has a protrusion that extends into the drive groove and can slide within the drive groove; when the protrusion is located in the inclined section, the limiting member is in the first state, and when the protrusion is located in the straight section, the limiting member is in the second state.

[0009] This core-pulling structure improves space utilization by providing a driving groove on the side of the first slider and having a protrusion in the limiting member that extends into and slides within the driving groove. The driving groove has a straight section and an inclined section that gradually narrows towards the straight section. When the protrusion is in the inclined section, the limiting member is in a first state; when the protrusion is in the straight section, the limiting member is in a second state. This allows the limiting member to perform its control function without increasing additional space occupation, further improving the overall space utilization of the mold and reducing mold opening costs.

[0010] In at least one embodiment, the driving groove is disposed on the side of the first slider along the second direction, the driving groove extends along the first direction, and the second direction is perpendicular to the first direction; the sliding groove extends along a third direction, and the limiting groove is disposed on the side near the pressure plate along the third direction, the third direction being perpendicular to the second direction and the first direction.

[0011] In this core-pulling structure, the extension direction of the drive groove and the extension direction of the sliding groove are perpendicular to each other, so that when the drive component drives the first slider to move, the first slider changes the movement direction of the limiting component through the drive groove. The limiting groove is set along the third direction on the side close to the pressure plate, so that the limiting component can realize the function of stopping and limiting the block.

[0012] In at least one embodiment, the stop has a blocking portion that abuts against the side of the first slider away from the second slider after the protrusion enters the straight section from the inclined section.

[0013] In this core-pulling structure, the stop has a blocking part. After the first slider moves a certain distance, the limiting member gradually changes from the state of extending out of the pressure plate to the state of retracting into the pressure plate, so as to release the limiting effect of the limiting member on the stop. At this time, the blocking part abuts against the side of the first slider away from the second slider, so that the first slider drives the stop and the second slider to move together, thereby realizing the two-stage separation of the mold.

[0014] In at least one embodiment, the surfaces of the first slider and the blocking portion that abut against each other are a first abutting surface and a second abutting surface, respectively, and the travel of the protrusion in the inclined section is equal to the distance between the first abutting surface and the second abutting surface along the first direction.

[0015] In this core-pulling structure, when the protrusion enters the straight section from the inclined section, the blocking part abuts against the side of the first slider away from the second slider. At this time, the surfaces of the first slider and the blocking part that abut against each other are the first abutting surface and the second abutting surface, respectively. Along the first direction, the distance between the first abutting surface and the second abutting surface is equal to the stroke of the protrusion in the inclined section. This allows the blocking part to abut against the side of the first slider away from the second slider when the limiting member switches from the first state to the second state. As a result, the first slider drives the stop block and the second slider to move together, reducing the idle stroke time during the core-pulling process and improving the demolding efficiency.

[0016] In at least one embodiment, the active insert satisfies at least one of the following conditions a and b:

[0017] a. The movable insert includes a first insert, which is slidably disposed on the first slider along a third direction. The core-pulling block has a first core-pulling track, which extends along the third direction in the orthographic projection of the first slider toward the side of the second slider. The first insert slides along the first core-pulling track.

[0018] b. The movable insert includes a second insert slidably disposed on the first slider along a second direction, the core-pulling block having a second core-pulling track, the second core-pulling track extending along the second direction in the orthographic projection of the first slider toward the side of the second slider, and the first insert sliding along the second core-pulling track.

[0019] This core-pulling structure uses a core-pulling track on the core-pulling block. When the movable insert slides along the core-pulling track, the second slider is temporarily fixed. Therefore, the core-pulling block can drive the movable insert to slide along the second slider in a first or third direction, so that the movable insert is demolded first from the position of the product's undercut design.

[0020] In at least one embodiment, the driving element is configured as a driving cylinder.

[0021] This core-pulling structure uses a drive cylinder as the driving component. Compared with other driving methods, the drive cylinder is more stable in operation, has lower cost, and can improve mold quality and molding yield.

[0022] In at least one embodiment, the core-pulling structure further includes a sensing component, which includes an in-situ sensor and a sensing block. The in-situ sensor is fixedly disposed relative to the base plate, and the sensing block is fixed to the stop block. When the limiting member is in the first state, the sensing block abuts against the in-situ sensor. When the limiting member is in the second state, the sensing block separates from the in-situ sensor.

[0023] This core-pulling structure uses a sensing block set on the stop block, while the position sensor is fixedly set relative to the base plate. When the limiting member is in the first state, the sensing block abuts against the position sensor. When the limiting member is in the second state, the sensing block separates from the position sensor, thus facilitating the sensing of the working state and processing number of the core-pulling structure.

[0024] In at least one embodiment, the core-pulling structure includes at least two sets of molding units, each set of molding units including the core-pulling block, the fixing block, and the movable insert.

[0025] This core-pulling structure includes at least two molding units, each of which includes a core-pulling block, a fixing block, and a movable insert. At least two molding units are simultaneously set on the first slider and the second slider. At least two products can be formed in one processing cycle, improving space utilization and processing efficiency. Attached Figure Description

[0026] Figure 1 A schematic diagram of the overall structure of the core-pulling structure in one embodiment of this application is shown, which illustrates the upper surface of the core-pulling structure.

[0027] Figure 2 A schematic diagram of the overall structure of the core-pulling structure in one embodiment of this application is shown, illustrating the lower surface of the core-pulling structure.

[0028] Figure 3 An exploded view of the core-pulling structure in one embodiment of this application is shown.

[0029] Figure 4 A schematic diagram of the overall structure of the first slider in one embodiment of this application is shown, illustrating the structure of the groove.

[0030] Figure 5 A schematic diagram of the overall structure of the second sliding component in one embodiment of this application is shown.

[0031] Figure 6 A schematic diagram of the overall structure of the second slider in one embodiment of this application is shown, illustrating the structure of the groove.

[0032] Figure 7 A side view of the core-pulling block and the first insert in one embodiment of this application is shown, illustrating the extension direction of the first core-pulling track.

[0033] Figure 8 A schematic diagram of the end face structure of the first core-pulling track in one embodiment of this application is shown.

[0034] Figure 9 A bottom view of the core-pulling block and the second insert in one embodiment of this application is shown, illustrating the extension direction of the second core-pulling track.

[0035] Figure 10 A schematic diagram of the end face structure of the second core-pulling track in one embodiment of this application is shown.

[0036] Figure 11 An exploded view of the limited-retraction component in one embodiment of this application is shown.

[0037] Figure 12 A side view of the first slider in one embodiment of this application is shown, illustrating the position of the first abutting surface.

[0038] Figure 13 A schematic diagram illustrating the movement process of the limit-retreat component in one embodiment of this application is shown.

[0039] Explanation of main component symbols

[0040] 001 Core-pulling structure

[0041] 100 base plate

[0042] 200 First sliding component

[0043] 210 First slider

[0044] 211 First Groove

[0045] 212 Card Slot

[0046] 213 Drive slot

[0047] 2131 Straight Section

[0048] 2132 Inclined Section

[0049] 214 First Supporting Surface

[0050] 220 core-pulling block

[0051] 221 First core-pulling track

[0052] 222 Second core-pulling track

[0053] 300 Second sliding component

[0054] 310 Second slider

[0055] 311 Second Groove

[0056] 320 fixing block

[0057] 321 Molding cavity

[0058] 330 active inlay

[0059] 331 First Inlay

[0060] 332 Second Inlay

[0061] 400 drive unit

[0062] 410 Drive Cylinder

[0063] 411 Drive lever

[0064] 500 Refund Limit Component

[0065] 510 pressure plate

[0066] 511 Sliding groove

[0067] 520 stop block

[0068] 521 Limiting groove

[0069] 522 Blocking Section

[0070] 5221 Second Supporting Surface

[0071] 530 limit component

[0072] 531 convex part

[0073] 600 sensing components

[0074] 610 In-situ Sensor

[0075] 620 sensing block

[0076] 9 products

[0077] X First Direction

[0078] Y Second Direction

[0079] Z Third Direction

[0080] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0081] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0082] For some products with complex internal structures, there are often undercut structures inside or on the outer periphery. These undercut structures can affect the separation of the product from the mold, causing inconvenience in demolding.

[0083] The embodiments of this application provide a core-pulling structure, which controls the movement of the second sliding component through a limiting component, so that the driving component first drives the first sliding component to move, so that the undercut design of the product is demolded first, and then the entire mold is separated from the product, thereby improving the problem of inconvenient demolding of products with undercut design.

[0084] Specifically, embodiments of this application provide a core-pulling structure, including a base plate, a first sliding assembly, a second sliding assembly, a driving member, and a limiting assembly. The first sliding assembly includes a first slider and a core-pulling block fixed to the first slider. The first slider is slidably disposed on the base plate along a first direction. The second sliding assembly includes a second slider, a fixed block, and a movable insert. The second slider is slidably disposed on the base plate along the first direction. The fixed block is fixed to the second slider. The movable insert is configured to extend into the fixed block and be driven by the core-pulling block to slide relative to the second slider, thereby forming the core of the product's undercut structure. The driving member is connected to the first slider to drive the first slider to move along the first direction. The limiting assembly includes a pressure plate, a stop block, and a limiting member. The pressure plate is fixedly disposed relative to the base plate. The stop block is fixedly connected to the second slider and slides on the surface of the pressure plate along the first direction. The limiting member is slidably disposed on the pressure plate and is driven by the first slider to have a first state and a second state. When the limiting member is in the first state, the limiting member extends out of the pressure plate to fix the relative position of the stop and the pressure plate; when the limiting member is in the second state, the limiting member retracts into the pressure plate to release the position restriction on the stop, so that the first slider can drive the stop to move.

[0085] In this core-pulling structure, both the first and second sliders are slidably mounted on the base plate along a first direction, while the pressure plate is fixed relative to the base plate. A stop block is fixed to the second slider, and a driving component connects to and drives the first slider. At this time, the limiting component is extended from the pressure plate, used to fix the relative position of the stop block and the pressure plate, allowing the second slider to remain temporarily fixed relative to the base plate. The core-pulling block drives the movable insert to move, so that the movable insert is first demolded from the undercut design position of the product. After the first slider moves a certain distance, the limiting component gradually changes from the extended pressure plate state to the retracted pressure plate state, releasing the limiting effect of the limiting component on the stop block. This allows the first slider to drive the stop block to move, causing the second slider and the fixed block to separate from the product, achieving two-stage separation of the mold and thus improving the problem of inconvenient demolding of products with undercut designs.

[0086] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the embodiments and features described below can be combined with each other.

[0087] Please see Figure 1 and Figure 2 One embodiment of this application provides a core-pulling structure 001, including a base plate 100, a first sliding component 200, a second sliding component 300, a driving member 400, and a limiting component 500. The base plate 100 is fixedly disposed, and the first sliding component 200 and the second sliding component 300 are both slidably disposed on the base plate 100 along a first direction X. The driving member 400 is used to drive the first sliding component 200 along the first direction X, and the limiting component 500 is used to restrict the movement of the second sliding component 300 or to be driven by the first sliding component 200 to slide along the first direction X.

[0088] In some embodiments, the first direction X is the direction in which the base plate 100 extends.

[0089] In some embodiments, the base plate 100 is fixed to a frame (not shown) in the injection mold so that the base plate 100 has a stable mounting base.

[0090] Please see Figure 3 and Figure 4 In some embodiments, the first sliding assembly 200 includes a first slider 210 and a core-pulling block 220 fixed to the first slider 210. A first groove 211 is provided on the bottom surface of the first slider 210, and the base plate 100 is partially engaged within the first groove 211. When the first slider 210 slides on the upper surface of the base plate 100, the first groove 211 restricts the first slider 210 to slide only along a first direction X. The core-pulling block 220 is fixed to the side of the first slider 210 so that the core-pulling block 220 can move synchronously with the first slider 210.

[0091] In some embodiments, the first sliding assembly 200 includes a first slider 210 and a plurality of core-pulling blocks 220, wherein the plurality of core-pulling blocks 220 are fixed to the side of the first slider 210 along a second direction Y or a third direction Z. The number of core-pulling blocks 220 can be 2, 3, 4, 5, 6, etc., and the number of core-pulling blocks 220 can be 2 or 3 due to the overall volume of the mold.

[0092] In some embodiments, the second direction Y is set horizontally and perpendicular to the first direction X.

[0093] In some embodiments, the third party is vertically positioned in the Z direction and is simultaneously perpendicular to the first direction X and the second direction Y.

[0094] In some embodiments, the drive component 400 is configured as a drive cylinder 410. Compared to other drive methods such as motor drives, the drive cylinder 410 offers stable operation, low cost, and can improve mold quality and molding yield. The drive cylinder 410 is fixed to the frame in the injection mold. The drive cylinder 410 has a drive rod 411, and a slot 212 is provided on the side of the first slider 210 near the drive component 400. The drive rod 411 is detachably connected to the slot 212 for driving the first slider 210 to move.

[0095] Please see Figure 1 , Figure 5 and Figure 6 In some embodiments, the second sliding assembly 300 includes a second slider 310, a fixing block 320, and a movable insert 330. The bottom surface of the second slider 310 has a second groove 311, and the base plate 100 is partially engaged within the second groove 311. When the second slider 310 slides on the upper surface of the base plate 100, the second groove 311 restricts the second slider 310 to slide only along a first direction X. The fixing block 320 is fixed to the side of the second slider 310 away from the first slider 210, so that the fixing block 320 can move synchronously with the second slider 310.

[0096] In some embodiments, the fixing block 320 is fixed to the second slider 310, the fixing block 320 is provided with a molding cavity 321, and the movable insert 330 is configured to extend into the molding cavity 321 of the fixing block 320 and slide relative to the second slider 310 driven by the core-pulling block 220 to form the core of the undercut structure of product 9.

[0097] Please see Figure 5 , Figure 7 and Figure 8 In some embodiments, the movable insert 330 includes a first insert 331, which is slidably disposed on the first slider 210 along a third direction Z. The core-pulling block 220 has a first core-pulling track 221, which extends along a third direction Z in the orthographic projection of the first slider 210 toward the side of the second slider 310, and the first insert 331 slides along the first core-pulling track 221. When the core-pulling block 220 moves away from the second slider 310, since the second slider 310 is temporarily fixed, the core-pulling block 220 can drive the first insert 331 to slide along a third direction Z on the first slider 210, so that the first insert 331 is demolded first from the position of the undercut design of the product 9.

[0098] In some embodiments, the cross-section of the first core-pulling track 221 is Ω-shaped along its length perpendicular to the length of the first core-pulling track 221, and the first insert 331 is provided with an Ω-shaped track groove (not shown) that mates with the outer wall surface of the first core-pulling track 221, so that the first insert 331 can slide along the length of the first core-pulling track 221. Simultaneously, since the first insert 331 is slidably disposed on the first slider 210 in the third direction Z, when the core-pulling block 220 moves away from the second slider 310, the core-pulling block 220 drives the first insert 331 to slide along the third direction Z on the first slider 210.

[0099] Please see Figure 5 , Figure 9 and Figure 10 In some embodiments, the movable insert 330 includes a second insert 332, which is slidably disposed on the first slider 210 along a second direction Y. The core-pulling block 220 has a second core-pulling track 222, which extends along the second direction Y in the orthographic projection of the first slider 210 toward the side of the second slider 310, and the first insert 331 slides along the second core-pulling track 222. When the core-pulling block 220 moves away from the second slider 310, since the second slider 310 is temporarily fixed, the core-pulling block 220 can drive the second insert 332 to slide along the second direction Y on the first slider 210, so that the second insert 332 is demolded first from the position of the undercut design of the product 9.

[0100] In some embodiments, the cross-section of the second core-pulling track 222 is dovetail-shaped along its length perpendicular to the second core-pulling track 222. The second insert 332 is provided with a dovetail-shaped track groove (not shown) that mates with the outer wall of the second core-pulling track 222, allowing the second insert 332 to slide along the length of the second core-pulling track 222. Simultaneously, since the second insert 332 is slidably disposed on the first slider 210 along the third direction Z, when the core-pulling block 220 moves away from the second slider 310, the core-pulling block 220 causes the second insert 332 to slide along the third direction Z on the first slider 210.

[0101] In some embodiments, the movable insert 330 includes both a first insert 331 and a second insert 332, so that the core-pulling structure 001 can simultaneously pull the core in the second direction Y and the third direction Z when the core-pulling block 220 moves away from the second slider 310, so as to be suitable for more complex undercut structures, improve the application scenarios of the mold, and many secondary demolding products 9 can be used as a reference.

[0102] Please see Figure 1 , Figure 4 , Figure 11 as well as Figure 13In some embodiments, the limiting assembly 500 includes a pressure plate 510, a stop 520, and a limiting member 530. The pressure plate 510 is fixedly disposed relative to the base plate 100, and the stop 520 is fixedly connected to the second slider 310 and slides along the first direction X on the surface of the pressure plate 510. The limiting member 530 is slidably disposed on the pressure plate 510 and is driven by the first slider 210 to have a first state A and a second state B. When the limiting member 530 is in the first state A, the limiting member 530 extends out of the pressure plate 510 to fix the relative position of the stop 520 and the pressure plate 510; when the limiting member 530 is in the second state B, the limiting member 530 retracts into the pressure plate 510 to release the position restriction on the stop 520, so that the first slider 210 can drive the stop 520 to move.

[0103] In some embodiments, the pressure plate 510 is provided with a sliding groove 511, which extends along the third direction Z. The stop block 520 is provided with a limiting groove 521, which is located on the side of the stop block 520 facing the pressure plate 510. The limiting member 530 slides within the sliding groove 511 and can be driven by the first slider 210 to extend into or out of the limiting groove 521. Compared with the related technical means where the driving member 400 directly drives the limiting member 530, the limiting member 530 in this application is driven by the first slider 210, thereby extending into or out of the limiting groove 521 to achieve the limiting function. This reduces the space occupied by the limiting component 500 on the entire extended core-pulling structure 001, resulting in a compact structure, improved space utilization of the entire mold, and significantly reduced mold opening costs.

[0104] In some embodiments, the side of the first slider 210 is provided with a drive groove 213, the drive groove 213 having a straight section 2131 and an inclined section 2132 that gradually narrows toward the straight section 2131. The side of the limiting member 530 has a protrusion 531, the protrusion 531 extending into the drive groove 213 and being able to slide within the drive groove 213, thereby improving the space utilization of the core-pulling structure 001. When the protrusion 531 is located in the inclined section 2132, the limiting member 530 is in a first state A, and when the protrusion 531 is located in the straight section 2131, the limiting member 530 is in a second state B, so that the limiting member 530 can play its control role without increasing the additional space occupation, further improving the space utilization of the entire mold and reducing the mold opening cost.

[0105] In some embodiments, the drive groove 213 is disposed on the side of the first slider 210 along the second direction Y, the drive groove 213 extends along the first direction X, and the extension direction of the drive groove 213 and the extension direction of the sliding groove 511 are perpendicular to each other, so that when the drive member 400 drives the first slider 210 to move, the first slider 210 changes the movement direction of the limiting member 530 through the drive groove 213. The limiting groove 521 is disposed on the side near the pressure plate 510 along the third direction Z, so that the limiting member 530 realizes the function of stopping and limiting the stop block 520.

[0106] Please see Figure 1 , Figure 11 , Figure 12 as well as Figure 13 In some embodiments, the stop 520 has a blocking portion 522, which is used to stop the second slider 310 after the limiting member 530 retracts into the pressure plate 510 to release the limiting effect on the stop 520. That is, when the protrusion 531 enters the straight section 2131 from the inclined section 2132, the blocking portion 522 abuts against the side of the first slider 210 away from the second slider 310. After the first slider 210 moves a certain distance, the limiting member 530 gradually changes from the state of extending out of the pressure plate 510 to the state of retracting into the pressure plate 510 to release the limiting effect of the limiting member 530 on the stop 520. At this time, the blocking portion 522 abuts against the side of the first slider 210 away from the second slider 310, thereby driving the stop 520 and the second slider 310 to move together through the first slider 210, realizing the two-stage separation of the mold.

[0107] In some embodiments, the surfaces of the first slider 210 and the blocking part 522 that abut against each other are the first abutting surface 214 and the second abutting surface 5221, respectively. The travel of the protrusion 531 in the inclined section 2132 is equal to the distance between the first abutting surface 214 and the second abutting surface 5221 along the first direction X, so that when the limiting member 530 switches from the first state A to the second state B, the blocking part 522 abuts against the side of the first slider 210 away from the second slider 310, thereby driving the stop block 520 and the second slider 310 to move together through the first slider 210, reducing the idle travel time in the core pulling process and improving the demolding efficiency.

[0108] In some embodiments, the core-pulling structure 001 further includes a sensing component 600, which includes an in-situ sensor 610 and a sensing block 620. The in-situ sensor 610 is fixedly disposed relative to the base plate 100, and the sensing block 620 is fixed to the blocking portion 522. When the limiting member 530 is in a first state A, the sensing block 620 abuts against the in-situ sensor 610. When the limiting member 530 is in a second state B, the sensing block 620 separates from the in-situ sensor 610, thereby facilitating the sensing of the working state and processing number of the core-pulling structure 001.

[0109] In some embodiments, the core-pulling structure 001 includes at least two molding units. Each molding unit can cooperate with the first slider 210, the second slider 310, and the fixing block 320 to form the undercut portion of a product 9. Each molding unit includes a core-pulling block 220, a fixing block 320, and a movable insert 330. At least two molding units are simultaneously provided on the first slider 210 and the second slider 310 so that at least two products 9 can be formed in one processing cycle, improving space utilization and processing efficiency.

[0110] During demolding, the core-pulling structure 001 is such that both the first slider 210 and the second slider 310 are slidably disposed on the base plate 100 along the first direction X, while the pressure plate 510 is fixed relative to the base plate 100. The stop block 520 is fixed to the second slider 310, and the driving member 400 is connected to and drives the first slider 210. The driving cylinder 410 drives the first slider 210 along the first direction X, causing the first slider 210 to move away from the second slider 310. At this time, the protrusion 531 is located in the inclined section 2132, and the limiting member 530 is in the first state A, that is, the limiting member 530 extends out of the pressure plate 510 to fix the relative position of the stop block 520 and the pressure plate 510, thereby keeping the second slider 310 fixed relative to the base plate 100.

[0111] The first slider 210 drives the core-pulling block 220 to move away from the second slider 310. The core-pulling block 220 drives the first insert 331 to slide along the third direction Z on the first slider 210, so that the first insert 331 is demolded first from the position of the undercut design of the product 9, and / or the core-pulling block 220 drives the second insert 332 to slide along the third direction Z on the first slider 210, so that the second insert 332 is demolded first from the position of the undercut design of the product 9.

[0112] When the first slider 210 continues to move away from the second slider 310, and the protrusion 531 is located in the straight section 2131, the limiting member 530 is in the second state B, that is, the limiting member 530 retracts into the pressure plate 510 to release the position restriction on the stop block 520, so that the first slider 210 can drive the stop block 520 to move. At this time, the blocking part 522 abuts against the side of the first slider 210 away from the second slider 310, so that the first slider 210 drives the stop block 520 and the second slider 310 to move together. The second slider 310 and the fixing block 320 separate from the product 9, realizing the two-stage separation of the mold, thereby improving the problem of inconvenient demolding of the product 9 with the undercut design.

[0113] In addition, those skilled in the art may make other changes within the scope of the technical concept of this application. Of course, all such changes made based on the technical concept of this application should be included within the scope disclosed in this application.

[0114] In addition, those skilled in the art may make other changes within the scope of the technical concept of this application. Of course, all such changes made based on the technical concept of this application should be included within the scope disclosed in this application.

Claims

1. A core-pulling structure for use in the undercut structure of molded products, characterized in that, include: Base plate; A first sliding assembly, comprising a first slider and a core-pulling block fixed to the first slider, wherein the first slider is slidably disposed on the base plate along a first direction; The second sliding assembly includes a second slider, a fixed block, and a movable insert. The second slider is slidably disposed on the base plate along the first direction. The fixed block is fixed to the second slider. The movable insert is configured to extend into the fixed block and slide relative to the second slider under the drive of the core-pulling block to form the core of the product's undercut structure. A driving element, which is connected to the first slider to drive the first slider to move along the first direction; The limited-retraction component includes a pressure plate, a stop block, and a limiting member. The pressure plate is fixedly disposed relative to the base plate. The stop block is fixedly connected to the second slider and is slidably disposed on the surface of the pressure plate along the first direction. The limiting member is slidably disposed on the pressure plate and is driven by the first slider to have a first state and a second state. When the limiting member is in the first state, the limiting member extends out of the pressure plate to fix the relative position of the stop block and the pressure plate; when the limiting member is in the second state, the limiting member retracts into the pressure plate to release the position restriction on the stop block, so that the first slider can drive the stop block to move. The first slider is provided with a drive groove, the drive groove having a straight section and an inclined section that gradually narrows toward the straight section; The limiting member has a protrusion that extends into the drive groove and can slide within the drive groove; when the protrusion is located in the inclined section, the limiting member is in the first state, and when the protrusion is located in the straight section, the limiting member is in the second state.

2. The core-pulling structure as described in claim 1, characterized in that, The stop block is provided with a limiting groove, the pressure plate is provided with a sliding groove, the limiting member slides in the sliding groove, and the limiting member can be driven by the first slider to extend into or disengage from the limiting groove.

3. The core-pulling structure as described in claim 2, characterized in that, The driving groove is disposed on the side of the first slider along the second direction, the driving groove extends along the first direction, and the second direction is perpendicular to the first direction; the sliding groove extends along the third direction, and the limiting groove is disposed on the side near the pressure plate along the third direction, the third direction being perpendicular to the second direction and the first direction.

4. The core-pulling structure as described in claim 1, characterized in that, The stop has a blocking portion that abuts against the side of the first slider away from the second slider after the protrusion enters the straight section from the inclined section.

5. The core-pulling structure as described in claim 4, characterized in that, The surfaces of the first slider and the blocking part that abut against each other are the first abutting surface and the second abutting surface, respectively. The travel of the protrusion in the inclined section is equal to the distance between the first abutting surface and the second abutting surface along the first direction.

6. The core-pulling structure as described in claim 1, characterized in that, The movable insert satisfies at least one of the following conditions a and b: a. The movable insert includes a first insert, which is slidably disposed on the first slider along a third direction. The core-pulling block has a first core-pulling track, which extends along the third direction in the orthographic projection of the first slider toward the side of the second slider. The first insert slides along the first core-pulling track. b. The movable insert includes a second insert slidably disposed on the first slider along a second direction, the core-pulling block having a second core-pulling track, the second core-pulling track extending along the second direction in the orthographic projection of the first slider toward the side of the second slider, and the first insert sliding along the second core-pulling track.

7. The core-pulling structure as described in claim 1, characterized in that, The driving component is configured as a driving cylinder.

8. The core-pulling structure as described in claim 1, characterized in that, The core-pulling structure also includes a sensing component, which includes an in-situ sensor and a sensing block. The in-situ sensor is fixedly disposed relative to the base plate, and the sensing block is fixed to the stop block. When the limiting member is in the first state, the sensing block abuts against the in-situ sensor. When the limiting member is in the second state, the sensing block separates from the in-situ sensor.

9. The core-pulling structure as described in claim 1, characterized in that, The core-pulling structure includes at least two molding units, each of which includes the core-pulling block, the fixing block, and the movable insert.

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