Injection mold

Abstract

The utility model provides an injection mold which comprises a fixed mold, a movable mold and a core-pulling structure, a concave mold groove is formed in the surface of the fixed mold, and a first slide seat and a second slide seat of the core-pulling structure can slide; the second slide seat is provided with a first position, a second position and a third position, two guide slopes which are arranged back to back are formed on the second slide seat, two back-off inserts of the core pulling structure are both arranged on the first slide seat and are respectively connected with one guide slope in a sliding manner, and the second slide seat and the back-off inserts are respectively provided with a first mold core and a second mold core; when the second slide seat is located at the first position, the first mold core and the two second mold cores are located in the concave mold groove, and when the second slide seat is located at the first position to the second position, the two back-off inserts slide along the guide slopes so as to be close to or away from each other; and the second slide seat is locked with the first slide seat from the second position to the third position so as to drive the first slide seat and the back-off insert to slide. According to the technical scheme, the damage risk during product demolding can be reduced, and the applicability of the injection molding process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold. Background Art

[0002] Plastic products are made of plastic as the main raw material through various injection molds. Different shapes of injection molded products are made through different injection molds, so they are widely used in various fields of daily life. Due to the diversity of application scenarios of plastic products, it is necessary to open grooves, holes and other structures on the side of plastic products. At this time, it is necessary to set a core in the cavity during the injection molding process and perform core pulling after injection molding. However, the current core pulling only pulls the core out of the product's groove, hole and other structural openings, which is easy to scratch the edge of the opening; and for some products where the internal width of the groove and hole is larger than the opening width, if this injection molding process is used, the core cannot be pulled out of the product. If the core is forcibly pulled out, it will inevitably damage the product structure, resulting in limitations in the injection molding process. Utility Model Content

[0003] The main purpose of the utility model is to provide an injection mold, aiming to reduce the risk of damage to the product during demoulding and improve the applicability of the injection molding process.

[0004] To achieve the above-mentioned purpose, the utility model proposes an injection mold, comprising a fixed mold, a movable mold and a core pulling structure, wherein the fixed mold is provided with a concave mold groove on the surface facing the movable mold, and the movable mold and the fixed mold are closed to form a cavity when the mold is closed; the core pulling structure comprises:

[0005] A first row seat, the first row seat can be slidably arranged to approach or move away from the die groove;

[0006] a second row seat, the second row seat being slidably disposed on the first row seat to approach or move away from the die groove, and having a first position, a second position and a third position, at least a portion of the second row seat gradually shrinking toward the direction approaching the die groove and forming two guide inclined surfaces arranged back to back, and a first core being disposed at one end of the second row seat facing the die groove; and

[0007] Two undercut inserts, both of which are arranged on the first row seat, each of which is slidably connected to one of the guide slopes, and a second core is arranged at one end of the undercut insert facing the concave die groove;

[0008] Wherein, when the second slide seat is located at the first position, the first core and the two second cores are both located at the die groove, and during the sliding process of the second slide seat between the first position and the second position, each undercut insert slides relative to the corresponding guide inclined surface to approach or move away from another undercut insert;

[0009] The second row seat is locked with the first row seat when the position moves from the second position to the third position, so as to drive the first row seat and the undercut insert to slide.

[0010] In one embodiment of the present application, one of the first row seat and the second row seat is provided with a strip hole extending along the sliding direction of the second row seat, and the other of the first row seat and the second row seat is provided with a positioning pin;

[0011] The positioning pin is inserted into the strip-shaped hole, and when the second row seat is between the second position and the third position, the positioning pin abuts against one end side wall of the strip hole to lock the second row seat with the first row seat;

[0012] And / or, the undercut insert is provided with one of a sliding portion and a sliding groove, the guide inclined surface is provided with the other of the sliding portion and the sliding groove, and the sliding portion is provided in the sliding groove.

[0013] In one embodiment of the present application, a first limiting groove and two second limiting grooves are formed on the top surface of the first row seat, the first limiting groove extends along the sliding direction of the second row seat, and the second row seat is arranged in the first limiting groove;

[0014] The two second limiting grooves are respectively arranged at two sides of the first limiting groove, and each of the undercut inserts is arranged in one of the second limiting grooves.

[0015] In one embodiment of the present application, the first slide seat includes a seat body and a slide insert, the seat body is slidably connected to the fixed mold, the slide insert is detachably arranged on the top surface of the seat body, and the second limiting groove and at least part of the first limiting groove are opened in the slide insert.

[0016] In one embodiment of the present application, a limiting portion is convexly provided on the top surface of the seat body, and the limiting portion is located on a side of the slide insert away from the die groove;

[0017] And / or, the top surface of the seat body is provided with one of a clamping portion and a clamping groove, the bottom surface of the slide insert is provided with the other of the clamping portion and the clamping groove, and the clamping portion is arranged in the clamping groove.

[0018] In one embodiment of the present application, the core pulling structure further includes a cover structure, and the cover structure is provided to cover the first limiting groove and the second limiting groove;

[0019] And / or, the core-pulling structure further comprises an elastic positioning member, one end of which is protruding from the groove wall of the first limiting groove, and the side wall of the second position seat is provided with at least two positioning holes arranged in sequence along the sliding direction, and when the second position seat is located at the first position and the second position, the elastic positioning member is respectively held in one of the positioning holes;

[0020] And / or, the second limit groove includes a connected sliding section and an avoidance section, the avoidance section is connected to the first limit groove and extends toward one side of the die groove, the sliding section extends from the avoidance section in a direction away from the first limit groove, the undercut insert includes a main body and a guide part, the main body is arranged on the avoidance section and is provided with the second core, the main body is slidably connected to the guide inclined surface, and the guide part is protruding on the side of the main body away from the second row seat and is arranged on the sliding section.

[0021] In one embodiment of the present application, the injection mold further includes an inclined guide member, the inclined guide member extends from the movable mold toward the fixed mold, and is inclined in a direction away from the die groove along the sliding direction of the second row seat;

[0022] An inclined hole is formed on the top surface of the second row seat, and the inclined hole extends in a depth direction away from the die groove. The inclined guide piece can enter and exit the inclined hole to drive the second row seat to slide.

[0023] In one embodiment of the present application, the injection mold also includes a limit block, which is arranged on the movable mold. When the movable mold is closed on the fixed mold, at least part of the limit block is located on the side of the second row seat away from the die groove and contacts the second row seat.

[0024] In one embodiment of the present application, the surface of the limit block facing the second position seat is inclined away from the core pulling structure to form a limit surface, and the surface of the second position seat away from the die groove is inclined away from the die groove and is arranged opposite to the limit surface;

[0025] And / or, a buffer is provided on the surface of the limiting block facing the core-pulling structure.

[0026] In one embodiment of the present application, the core-pulling structure is movably disposed on the fixed mold;

[0027] And / or, the injection mold further includes a position sensor, which is disposed on the fixed mold and is used to detect the position of the first row seat or the second row seat.

[0028] The technical solution of the present application is to set the core-pulling structure in the injection mold as a combination structure of a first row seat, a second row seat and two inverted inserts. When the injection mold is used to make products, the second row seat of the core-pulling structure is moved to the first position. At this time, the first core at the end of the second row seat and the second core at the ends of the two inverted inserts are arranged side by side and inserted in the die groove, so that the injection mold is closed and the die groove is formed into a cavity, and injection molding material is injected into the cavity; when the product is demoulded and core-pulled after cooling and molding, the second row seat is driven to slide in the direction away from the die groove. During this process, the first core gradually retreats, and the two inverted inserts are limited by the first row seat and can only slide relative to the guide inclined surface of the second row seat, so that the two inverted inserts and the second core arranged at their ends are close to each other until the second row seat slides to the second position; in the second position, the second row seat is locked with the first row seat, so that the second row seat slides with the first row seat and the inverted insert, so that the first core and the second core can be pulled out from the product, or the first core and the second core can be not completely pulled out, but the product is separated from the core-pulling structure by picking up the product. That is, the present application divides the core structure into a first core and a second core, and first brings the two second cores closer together to reduce the width during the core pulling process, so that the core pulling structure will not scratch the product opening when withdrawing from the product. When the internal width of the injection molding groove or hole is greater than the opening width of the product, the core pulling operation can also be completed without damaging the product, thereby reducing the risk of damage to the product during demolding and improving the applicability of the injection molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 This is a structural diagram of an embodiment of the injection mold of the present application;

[0031] Figure 2 for Figure 1 Exploded view of the injection mold;

[0032] Figure 3 for Figure 2 Coordination structure diagram of the middle fixed mold and core pulling structure and other parts;

[0033] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0034] Figure 5 for Figure 3 Top view of the center fixed mold and core pulling structure;

[0035] Figure 6 for Figure 5 The enlarged view of point B in the middle;

[0036] Figure 7 This is a structural diagram of an embodiment of a core pulling structure in an injection mold of the present application;

[0037] Figure 8 for Figure 7 Exploded view of the core pulling structure;

[0038] Fig. 9 for Figure 1 A cross-sectional view of the injection mold;

[0039] Fig.10 for Fig. 9 Enlarged view of point C in the middle;

[0040] Fig.11 This is a diagram of the matching structure of the movable mold, the guide member and other components in the injection mold of this application.

[0041] Description of Figure Numbers:

[0042] Label name Label name 100 Injection mold 32 Second row seat 10 Fixed mold 321 Guide bevel 11 Hou Mo Ren 322 First core 111 Die groove 323 Slanted hole 20 Moving mold 324 Positioning hole 21 Qian Mo Ren 325 Sliding part 30 Core pulling structure 33 Undercut inserts 31 First row seat 331 Second core 311 base body 332 Main body 3111 Limiting part 333 Guide 3112 Card connection 334 Chute 312 Slide inserts 34 Positioning pin 3121 Card slot 35 Elastic positioning parts 3122 Strip hole 40 Incline guide 313 Cover structure 50 Limit block 314 The first limit slot 51 Buffer 315 The second limiting groove 60 Position Sensors 3151 Avoidance section 200 product 3152 Sliding segment

[0043] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0048] The utility model provides an injection mold 100 .

[0049] Please refer to Figures 1 to 6 In some embodiments of the present application, the injection mold 100 includes a fixed mold 10, a movable mold 20 and a core pulling structure 30. The surface of the fixed mold 10 facing the movable mold 20 is provided with a die groove 111. When the movable mold 20 and the fixed mold 10 are molded together, the die groove 111 is closed to form a cavity; the core pulling structure 30 includes a first row seat 31, a second row seat 32 and two undercut inserts 33. The first row seat 31 can be slidably arranged to approach or move away from the die groove 111; the second row seat 32 can be slidably arranged on the first row seat 31 to approach or move away from the die groove 111; Or away from the die groove 111, and having a first position, a second position and a third position, at least a part of the second row seat 32 gradually shrinks toward the direction close to the die groove 111 and forms two guide slopes 321 arranged back to back, and the second row seat 32 is provided with a first core 322 at one end facing the die groove 111; the two undercut inserts 33 are both arranged on the first row seat 31, each of the undercut inserts 33 is slidably connected to one of the guide slopes 321, and the undercut insert 33 is provided with a second core 331 at one end facing the die groove 111.

[0050] Among them, when the second row seat 32 is located at the first position, the first core 322 and the two second cores 331 are all located in the die groove 111, and during the sliding process of the second row seat 32 between the first position and the second position, each of the undercut inserts 33 slides relative to the corresponding guide slope 321 to approach or move away from another undercut insert 33; the second row seat 32 is locked with the first row seat 31 when it is from the second position to the third position, so as to drive the first row seat 31 and the undercut insert 33 to slide.

[0051] Specifically, the injection mold 100 includes a fixed mold 10 and a movable mold 20. The fixed mold 10 is provided with a rear mold core 11, and a surface of the rear mold core 11 facing the movable mold 20 is provided with a die groove 111; the movable mold 20 is provided with a front mold core 21 arranged opposite to the rear mold core 11, and the surface of the front mold core 21 facing the rear mold core 11 can be a plane, or it can be provided with a groove arranged opposite to the die groove 111 of the rear mold core 11; the movable mold 20 can be driven to approach and move away from the fixed mold 10, and when the movable mold 20 is molded with the fixed mold 10, the die groove 111 is closed to form a cavity. Among them, the gate connected to the cavity can be opened in the fixed mold 10 or in the movable mold 20, and the gate needs to be kept stable in the process of injecting the injection material so as to stably inject the injection material into the cavity.

[0052] In the embodiment of the present application, the injection mold 100 can be used for injection molding a product 200 provided with structures such as holes and grooves. A core pulling structure 30 is provided on the side of the rear mold core 11 in the fixed mold 10, so that the side of the concave mold groove 111 adjacent to the core pulling structure 30 is open to allow the core structure provided on the core pulling structure 30 to enter and exit; wherein the core pulling structure 30 includes a first row seat 31 slidably connected to the fixed mold 10, and a second row seat 32 slidably connected to the first row seat 31 and two undercut inserts 33 provided on the first row seat 31. When the first row seat 31 and the second row seat 32 slide, they can both approach or move away from the rear mold core 11, so that at least part of the structure on the second row seat 32 close to the rear mold core 11 is moved along the groove close to the rear mold core 11. The first row seat 31 is provided with two guide bevels 321 which are arranged opposite to each other in the width direction; the two undercut inserts 33 are provided on the first row seat 31, respectively located on both sides of the second row seat 32, and the undercut inserts 33 can slide relative to the first row seat 31 in the width direction of the first row seat 31, and the undercut inserts 33 are slidably connected with the guide bevels 321 on the same side; and the core structure includes a first core 322 provided at the end of the second row seat 32 facing the rear mold core 11, and a second core 331 provided at the ends of the two undercut inserts 33 facing the rear mold core 11. In this way, when the second row seat 32 slides relative to the first row seat 31 and approaches or moves away from the rear mold core 11, the undercut inserts 33 will slide relative to the guide bevels 321 and slide relative to the first row seat 31 in the width direction, so that the two second undercut inserts 33 are close to or away from each other in width. Among them, the sliding connection method between the second row seat 32 and the first row seat 31 can be to make the first row seat 31 and the second row seat 32 slidingly connected through a guide rail slider structure, or to adopt a screw rod structure for sliding connection, or in the following embodiment, the second row seat 32 is arranged in the first limit groove 314 of the first row seat 31, or other feasible sliding connection methods can be used; similarly, the sliding connection method in which the reverse lock insert 33 is slidably arranged on the guide inclined surface 321 can be a guide rail slider structure, a screw rod structure, or the matching method of the sliding part 325 and the sliding groove 334 in the following embodiment; and the matching method of the reverse lock insert 33 and the first row seat 31 can also adopt a guide rail slider structure, a screw rod structure and other structures, or in the following embodiment, the reverse lock insert 33 is set in the second limit groove 315, which is not limited here.

[0053] In addition, the second row seat 32 is defined to have a first position, a second position and a third position in its sliding direction; a driving member can be set to drive the second row seat 32 to slide, and when the second row seat 32 is in the first position, the first core 322 and the two second cores 331 are arranged side by side and inserted in the die groove 111 to form a core structure; in the process of the second row seat 32 moving from the first position to the second position, the second row seat 32 drives the first core 322 to withdraw from between the two second cores 331, and the two undercut inserts 33 slide relative to the guide inclined surface 321 and slide relative to the first row seat 31 in the width direction, so that the two second cores 331 are close to each other, so as to reduce the distance and width between the two second cores 331. When the second row seat 32 moves to the second position, the second row seat 32 and the first row seat 31 are locked with each other, which can be a magnetic connection between the second row seat 32 and the first row seat 31, or a snap connection, or the following embodiment adopts the matching method of the positioning pin 34 and the strip hole 3122; when the second row seat 32 moves from the second position to the third position, the second row seat 32 drives the first row seat 31 to slide, so that the two undercut inserts 33 provided on the first row seat 31 slide together, thereby causing the first core 322 and the two second cores 331 to retreat in the direction away from the rear mold core 11 at the same time. When the second row seat 32 reaches the third position, the first core 322 and the two second cores 331 may be completely withdrawn from the concave mold groove 111 and separated from the product 200; or part of the structure of the two second cores 331 or even part of the structure of the first core 322 may remain in the product 200, and the product 200 may be separated from the core-pulling structure 30 by picking up the product 200. Since the width of the two second cores 331 has been reduced when the second cores 331 are pulled out of the product 200, they will not wear against the opening edge of the product 200. When the internal width of the injection groove or hole is greater than the opening width of the product 200, the core-pulling operation can be completed without damaging the product 200.

[0054] It should be noted that in this embodiment, a motor, an air cylinder or a hydraulic cylinder can be used as a driving member to connect to the second row seat 32, so as to drive the second row seat 32 to slide. Alternatively, in the following embodiment, the second row seat 32 can be driven to slide by a guide member 40 provided on the fixed mold 10, which will not be elaborated here.

[0055] In addition, at least two cavities can be formed in the injection mold 100. At this time, a set of core pulling structures 30 can be set corresponding to each cavity, and different product 200 cavities can be used to mold products 200 of different shapes. The core structure composed of the first core 322 and the second core 331 on the corresponding core pulling structure 30 can also be different.

[0056] Therefore, it can be understood that the technical solution of the present application sets the core-pulling structure 30 in the injection mold 100 as a combination structure of a first row seat 31, a second row seat 32 and two inverted inserts 33. When the injection mold 100 is used to make the product 200, the second row seat 32 of the core-pulling structure 30 is moved to the first position. At this time, the first core 322 at the end of the second row seat 32 and the second core 331 at the ends of the two inverted inserts 33 are arranged side by side and inserted in the die groove 111, so that the injection mold 100 is closed to close the die groove 111 to form a cavity, and injection molding material is injected into the cavity; when the product 200 is demolded and core-pulled after cooling and molding, the second row seat 32 is driven to slide in the direction away from the die groove 111. During this process, the first core 322 gradually retreats, and the two inverted inserts 33 are limited by the first row seat 31 , can only slide relative to the guide inclined surface 321 of the second row seat 32, so that the two inverted inserts 33 and the second core 331 set at the end thereof are close to each other until the second row seat 32 slides to the second position; when the second row seat 32 is in the second position, it is locked with the first row seat 31, so that the second row seat 32 slides with the first row seat 31 and the inverted insert 33, so that the first core 322 and the second core 331 can be pulled out from the product 200, or the first core 322 and the second core 331 can be not completely pulled out, but the product 200 can be separated from the core pulling structure 30 by picking up the product 200. That is, the present application divides the core structure into a first core 322 and a second core 331, and in the core pulling process, first brings the two second cores 331 closer together to reduce the width, so that the core pulling structure 30 will not scratch the opening of the product 200 when withdrawing from the product 200. When the internal width of the injection molding groove or hole of the product 200 is greater than the opening width, the core pulling operation can also be completed without damaging the product 200, thereby reducing the risk of damage to the product 200 during demolding and improving the applicability of the injection molding process.

[0057] Combined with reference Figure 8 and Fig. 9 In some embodiments of the present application, one of the first row seat 31 and the second row seat 32 is provided with a strip hole 3122 extending along the sliding direction of the second row seat 32, and the other of the first row seat 31 and the second row seat 32 is provided with a positioning pin 34; the positioning pin 34 is inserted into the strip hole 3122, and when the second row seat 32 is from the second position to the third position, the positioning pin 34 abuts against one end side wall of the strip hole 3122 to lock the second row seat 32 with the first row seat 31.

[0058] In this embodiment, the first row seat 31 and the second row seat 32 are matched by a positioning pin 34 and a strip hole 3122, wherein the length of the strip hole 3122 is the same as the distance between the first position and the second position of the second row seat 32. The strip hole 3122 can be opened on the first row seat 31, and the positioning pin 34 can be inserted into the second row seat 32. When the second row seat 32 slides between the first position and the second position, the positioning pin 34 slides along the strip hole 3122. During this process, the first row seat 31 is fixed, and the two undercut inserts 33 approach or move away from each other. In the process of the second row seat 32 moving from the second position to the third position, the positioning pin 34 abuts against the side wall of one end of the strip hole 3122, so that the second row seat 32 can push the first row seat 31 to slide together through the positioning pin 34, thereby making the first row seat 31 and the two undercut inserts 33 move away from the die groove 111. In the process of the second row seat 32 moving from the third position to the second position, the positioning pin 34 abuts against the side wall of the other end of the strip hole 3122, so that the second row seat 32 can push the first row seat 31 to slide together through the positioning pin 34, so that the first row seat 31 and the two undercut inserts 33 are close to the die groove 111. The matching mode of the positioning pin 34 and the strip hole 3122 enables the first row seat 31 and the second row seat 32 to have different matching relationships at different stages, and the structure is simple. In addition, the mode of using the positioning pin 34 to push the first row seat 31 makes the coordinated movement of the first row seat 31 and the second row seat 32 more stable.

[0059] Please refer to Figure 8 In some embodiments of the present application, the undercut insert 33 is provided with one of the sliding portion 325 and the sliding groove 334, the guide inclined surface 321 is provided with the other of the sliding portion 325 and the sliding groove 334, and the sliding portion 325 is provided in the sliding groove 334.

[0060] The sliding part 325 may be provided on the inverted insert 33, and the slide groove 334 may be provided on the guide inclined surface 321 on the same side as the inverted insert 33; or the slide groove 334 may be provided on the inverted insert 33, and the sliding part 325 may be convexly provided on the guide inclined surface 321 on the same side as the inverted insert 33; both of them can make the inverted insert 33 and the guide inclined surface 321 slidably connected. The shape of the sliding part 325 is adapted to the cross-sectional shape of the slide groove 334, so that the connection between the inverted insert 33 and the second row seat 32 is more stable, and the stability of the sliding process of the inverted insert 33 relative to the second row seat 32 is improved. The cross-sectional shape of the slide groove 334 may be rectangular, circular, inverted trapezoidal, and other regular or irregular shapes, which are not limited here.

[0061] In some embodiments, the slide groove 334 is a dovetail groove, that is, the cross-sectional shape of the slide groove 334 is an inverted trapezoid. Such a configuration makes the slot size of the slide groove 334 smaller than the internal width of the slide groove 334, and the shape of the sliding portion 325 is adapted to the slide groove 334, which can prevent the sliding portion 325 from escaping from the slot of the slide groove 334, thereby improving the overall structural stability.

[0062] Combined with reference Figure 6 and Figure 8 In some embodiments of the present application, a first limiting groove 314 and two second limiting grooves 315 are formed on the top surface of the first row seat 31, the first limiting groove 314 extends along the sliding direction of the second row seat 32, and the second row seat 32 is arranged in the first limiting groove 314; the two second limiting grooves 315 are respectively arranged on both sides of the first limiting groove 314, and each of the undercut inserts 33 is arranged in one of the second limiting grooves 315.

[0063] In this embodiment, a first limiting groove 314 and a second limiting groove 315 are respectively arranged on both sides of the first limiting groove 314 on the top surface of the first row seat 31, wherein the first limiting groove 314 extends along the sliding direction of the second row seat 32, so that the second row seat 32 can slide in the first limiting groove 314; and the area of ​​the second limiting groove 315 is larger than the size of the undercut insert 33, so that the undercut insert 33 can move in the second limiting groove 315. The first limiting groove 314 and the second limiting groove 315 are used to accommodate the second row seat 32 and the undercut insert 33, so that the second row seat 32 and the undercut insert 33 can be limited, thereby improving the stability of the second row seat 32 during the activity process and preventing the second row seat 32 from being offset. In addition, the second row seat 32 and the inverted insert 33 can be prevented from protruding from the top surface of the first row seat 31, thereby preventing the second row seat 32 and the inverted insert 33 from being hit by other structures or objects, thereby reducing the risk of interference during the movement of the second row seat 32 and the inverted insert 33.

[0064] Combined with reference Figure 7 and Figure 8In some embodiments of the present application, the first slider seat 31 includes a seat body 311 and a slider insert 312, the seat body 311 is slidably connected to the fixed mold 10, the slider insert 312 is detachably arranged on the top surface of the seat body 311, and the second limiting groove 315 and at least part of the first limiting groove 314 are provided on the slider insert 312. Among them, the first limiting groove 314 can be completely provided on the slider insert 312, or in the following embodiments, a limiting portion 3111 is convexly provided on the top surface of the first slider seat 31 to limit the slider insert 312, and parts of the first limiting groove 314 are respectively provided on the slider insert 312 and the limiting portion 3111. The first row seat 31 is configured as a combination structure of a seat body 311 and a row insert 312, and the seat body 311 is slidably connected to the fixed mold 10. The row insert 312 is configured to be detachably connected to the seat body 311. Different second row seats 32 and undercut inserts 33 can be installed by replacing different row inserts 312, so that different core structures can be used to injection mold different products 200, thereby improving applicability and eliminating the need to repeatedly disassemble and assemble the sliding connection structure between the first row seat 31 and the fixed mold 10, thereby improving ease of use.

[0065] Please refer to Figure 7 In some embodiments of the present application, a limiting portion 3111 is convexly provided on the top surface of the seat body 311 , and the limiting portion 3111 is located on a side of the slide insert 312 away from the die groove 111 .

[0066] In this embodiment, a limiting portion 3111 is protruded from the top surface of the seat body 311 away from the rear mold core 11, so that the limiting portion 3111 and the slider insert 312 are arranged side by side; with such an arrangement, the limiting portion 3111 can be used to position and limit the slider insert 312, so as to facilitate the accurate installation of the slider insert 312 on the top surface of the seat body 311, and avoid the slider insert 312 from being displaced in the direction away from the rear mold core 11, so as to ensure the accurate positioning of the undercut insert 33 and the second slider seat 32, and ensure that the first core 322 and the second core 331 are accurately located in the die groove 111 during injection molding, thereby improving the molding accuracy of the product 200.

[0067] Combined with reference Figure 7 and Figure 8 In some embodiments of the present application, the top surface of the seat body 311 is provided with one of the clamping portion 3112 and the clamping groove 3121, and the bottom surface of the slide insert 312 is provided with the other of the clamping portion 3112 and the clamping groove 3121, and the clamping portion 3112 is arranged in the clamping groove 3121.

[0068] When the cam 312 is in the unlocking state, the locking portion 3112 is locked in the unlocking state, and the locking portion 3112 is locked in the unlocking state.

[0069] Please refer to Figure 7 In some embodiments of the present application, the core-pulling structure 30 further includes a cover structure 313, and the cover structure 313 covers at least a portion of the first limiting groove 314 and the second limiting groove 315. In this way, the second row seat 32 and the undercut insert 33 can be limited to prevent the second row seat 32 and the undercut insert 33 from floating or popping out of the first limiting groove 314 and the second limiting groove 315, thereby improving the structural and performance stability of the core-pulling structure 30.

[0070] Please refer to Figure 8 In some embodiments of the present application, the core pulling structure 30 also includes an elastic positioning member 35, one end of which is protruding from the groove wall of the first limiting groove 314, and the side wall of the second row seat 32 is provided with at least two positioning holes 324 arranged in sequence along the sliding direction, and when the second row seat 32 is located at the first position and the second position, the elastic positioning member 35 is respectively held in one of the positioning holes 324.

[0071] In this embodiment, a mounting hole is opened on the groove wall of the first limiting groove 314, and an elastic positioning member 35 is inserted. The elastic positioning member 35 may include an elastic portion and a positioning portion. The elastic portion is inserted into the mounting hole, and the other end of the elastic portion abuts against the positioning portion, so that the positioning portion can protrude from the mounting hole and appear in the first limiting groove 314. In this way, the positioning portion will compress the elastic portion and retract into the mounting hole when squeezed; in some embodiments, the elastic positioning member 35 may also include a shell, the elastic portion is arranged in the shell, and the positioning portion is arranged at one end of the shell, so that the various components of the elastic positioning member 35 are integrated into an integrated structure through the shell, which is convenient for disassembly and assembly of the elastic positioning member 35.

[0072] Correspondingly, at least two positioning holes 324 are provided on the side wall of the second row seat 32, and the positioning holes 324 are arranged in sequence along the sliding direction of the second row seat 32; wherein, when the second row seat 32 is located at the first position, the positioning portion of the elastic positioning member 35 is inserted into one of the positioning holes 324; when the second row seat 32 is driven to slide, the positioning portion is squeezed by the side wall of the second row seat 32 and retracts and escapes from the positioning hole 324; when the second row seat 32 moves to the second position, the positioning portion is ejected by the elastic portion and inserted into the other positioning hole 324. With such a configuration, the second row seat 32 can be limited by the cooperation of the elastic positioning member 35 and the positioning hole 324, thereby avoiding the problem of displacement when the second row seat 32 needs to be maintained in the first position, and avoiding relative sliding between the second row seat 32 and the first row seat 31 when the second row seat 32 moves to the second position and needs to be locked with the first row seat 31, thereby improving the structural and performance stability of the core pulling structure 30.

[0073] Among them, the end of the positioning portion facing the second row seat 32 can be set to a structure with a tapered cross-section, such as a spherical surface, a conical surface or other structures, so that the positioning portion can smoothly slide out of the positioning hole 324 when the second row seat 32 is driven to slide, thereby avoiding the elastic positioning member 35 from hindering the normal sliding of the second row seat 32.

[0074] Please refer to Figure 6 In some embodiments of the present application, the second limiting groove 315 includes a connected sliding section 3152 and an avoidance section 3151, the avoidance section 3151 is connected to the first limiting groove 314 and extends to the side of the die groove 111, the sliding section 3152 extends from the avoidance section 3151 in a direction away from the first limiting groove 314, the undercut insert 33 includes a main body 332 and a guide portion 333, the main body 332 is arranged on the avoidance section 3151 and is provided with the second core 331, the main body 332 is slidably connected to the guide bevel 321, and the guide portion 333 is protruding from the side of the main body 332 away from the second row seat 32, and is arranged on the sliding section 3152.

[0075] In this embodiment, the undercut insert 33 includes a main body portion 332 and a guide portion 333 connected to each other. The main body portion 332 extends roughly along the sliding direction of the second row seat 32. The end of the main body portion 332 facing the rear mold core 11 is provided with a second core 331, and the main body portion 332 is slidably connected to the guide inclined surface 321 of the second row seat 32; the guide portion 333 is convexly arranged on the surface of the main body portion 332 away from the second row seat 32; at the same time, the second limiting groove 315 on the first row seat 31 includes a connected avoidance section 3151 and a sliding section 3152, avoiding The avoidance section 3151 is connected to the first limiting groove 314, and the sliding section 3152 extends from the groove wall of the avoidance section 3151 away from the first limiting groove 314 to the direction away from the first limiting groove 314; wherein, the main body 332 of the inverted insert 33 is arranged in the avoidance section 3151, and the end of the inverted insert 33 protrudes out of the avoidance section 3151, and the guide portion 333 of the inverted insert 33 is arranged in the sliding section 3152, so as to guide and limit the sliding of the inverted insert 33 on the first row seat 31 through the cooperation of the guide portion 333 and the sliding section 3152.

[0076] Please refer to Figures 9 to 11 In some embodiments of the present application, the injection mold 100 further includes an inclined guide member 40, which extends from the movable mold 20 to the fixed mold 10 and is inclined along the sliding direction of the second row seat 32 in a direction away from the die groove 111; an inclined hole 323 is provided on the top surface of the second row seat 32, and the inclined hole 323 extends along the depth direction in a direction away from the die groove 111, and the inclined guide member 40 can enter and exit the inclined hole 323 to drive the second row seat 32 to slide.

[0077] In this embodiment, the sliding of the second row seat 32 is driven by the guide piece 40 provided on the movable mold 20. The guide piece 40 may be a columnar, block-shaped or plate-shaped structure. Specifically, one end of the guide piece 40 is connected to the movable mold 20, and the guide piece 40 is extended obliquely in a direction away from the rear mold core 11; an oblique hole 323 is provided on the surface of the second row seat 32 facing the movable mold 20, and the oblique hole 323 extends obliquely in a direction away from the rear mold core 11 along its depth direction, and is roughly adapted to the shape of the guide piece 40. When the movable mold 20 and the fixed mold 10 are closed, the diagonal guide piece 40 is inserted in the inclined hole 323; when demolding is performed after the injection molding is completed and the material is solidified, the movable mold 20 moves in the direction away from the fixed mold 10, so that the diagonal guide piece 40 is gradually pulled out of the inclined hole 323. At this time, the diagonal guide piece 40 will push the second row seat 32 to move from the first position to the second position and the third position in sequence. That is, the technical solution of this embodiment can simultaneously realize the core pulling operation of the product 200 in the process of separating the movable mold 20 and the fixed mold 10, thereby improving the demolding efficiency of the product 200, and there is no need to set an additional driving component for controlling the movement of the second row seat 32, thereby reducing energy consumption.

[0078] Please refer to Fig.10 and Fig.11 In some embodiments of the present application, the injection mold 100 also includes a limit block 50, and the limit block 50 is arranged on the movable mold 20. When the movable mold 20 is clamped on the fixed mold 10, at least part of the limit block 50 is located on the side of the second row seat 32 away from the die groove 111 and contacts the second row seat 32.

[0079] In the present embodiment, a limit block 50 is arranged on the surface of the movable mold 20 facing the fixed mold 10, and when the movable mold 20 is closed on the fixed mold 10, part of the limit block 50 is arranged on the side of the second row seat 32 away from the die groove 111. In this way, the limit block 50 can be used to limit the second row seat 32 to prevent the second row seat 32 from sliding away from the die groove 111 during the injection molding process, thereby ensuring that the second row seat 32 is stably located in the first position during the injection molding process, thereby ensuring that the first core 322 and the second core 331 are stably inserted in the cavity, thereby ensuring the processing accuracy and quality of the product 200. In addition, the limit block 50 can be removed before the movable mold 20 and the fixed mold 10 are separated, or the limit block 50 can be moved away from the core pulling structure 30 with the movable mold 20 when the movable mold 20 and the fixed mold 10 start to be separated. It can also be that in the following embodiment, the limit block 50 and the second row seat 32 are matched through an inclined surface, both of which can avoid the limit block 50 from interfering with the sliding of the second row seat 32 when the product 200 is demolded and the core is pulled.

[0080] Please refer to Figures 9 to 11 In some embodiments of the present application, the surface of the limit block 50 facing the second row seat 32 is inclined toward the side away from the core pulling structure 30 to form a limit surface, and the surface of the second row seat 32 away from the die groove 111 is inclined toward the side away from the die groove 111 and is arranged opposite to the limit surface.

[0081] In this embodiment, the surface of the limit block 50 facing the second row seat 32 forms an inclined limit surface, and the corresponding surface of the second row seat 32 away from the concave mold groove 111 is set as an inclined surface that fits with the limit surface; when demolding is performed after the injection molding is completed and the material is solidified, the limit block 50 moves with the movable mold 20 in the direction away from the fixed mold 10. During this process, the limit surface slides relative to the second row seat 32, but always keeps in contact with the second row seat 32, which can limit and guide the movement of the second row seat 32.

[0082] Please refer to Figures 9 to 11In some embodiments of the present application, a buffer 51 is provided on the surface of the limit block 50 facing the second row seat 32. The buffer 51 may be made of elastic material, thereby avoiding rigid contact between the limit block 50 and the second row seat 32, avoiding wear or mutual collision between the second row seat 32 and the limit block 50, and improving safety in use.

[0083] In some embodiments of the present application, the core-pulling structure 30 is movably disposed on the fixed mold 10 .

[0084] In this embodiment, other driving structures such as a lifting structure can be used to be transmission-connected with the core-pulling structure 30 to drive the core-pulling structure 30 to be raised and lowered relative to the fixed mold 10; with such a configuration, when the core-pulling structure 30 is not completely pulled out of the product 200, the core-pulling structure 30 can be lifted to allow the product 200 to be ejected from the die groove 111, thereby facilitating the removal of the product 200, without the need to set an ejection mechanism to eject the product 200 from the die groove 111, thereby reducing damage to the surface of the product 200; for example, the core-pulling structure 30 and the product 200 can be lifted first, and then the product 200 can be picked up by a robot and then the core of the product 200 can be pulled out; or, when the second row seat 32 is moved to the third position, part of the second core 331 and even part of the first core 322 are still not pulled out of the product 200, at which time the core-pulling structure 30 and the product 200 are lifted together, and then the product 200 is taken out of the core-pulling structure 30 by a robot.

[0085] In one embodiment of the present application, the injection mold 100 further includes a position sensor 60, which is disposed on the fixed mold 10 and is used to detect the position of the first row seat 31 or the second row seat 32. The position sensor 60 may be a proximity switch, a photoelectric sensor, or a Hall sensor, etc., and may be used to detect the position of the first row seat 31 or the second row seat 32; specifically, the position sensor 60 may send a sensing signal when the second row seat 32 slides to the third position, thereby indicating that the core pulling process has been completed and subsequent operations may be performed, for example, the core pulling structure 30 may be controlled to lift after the second row seat 32 slides to the third position, so as to facilitate subsequent material removal.

[0086] The following is an example in which the second row seat 32 is driven to slide by the inclined guide 40 disposed on the movable mold 20. When the injection molding is completed and the material is solidified and demolding is performed, the inclined guide 40 moves with the movable mold 20 in the direction away from the fixed mold 10, and at the same time, the inclined guide 40 pushes the second row seat 32 to move from the first position to the second position and the third position in sequence. During this process, the second row seat 32 drives the first core 322 to withdraw from between the two second cores 331, and the two undercut inserts 33 slide relative to the inclined guide surface 321 and slide relative to the first row seat 31 in the width direction, so that the two second cores 331 are close to each other; then the second row seat 32 The first row seat 31 and the two second inverted inserts 33 are driven to slide to the third position. At this time, part of the second core 331 has not been pulled out of the product 200. A proximity switch is used as the position sensor 60. When the second row seat 32 moves to the third position, the first row seat 31 triggers the proximity switch, causing the proximity switch to send out a sensing signal, which then controls the core pulling structure 30 to lift up, causing the product 200 to be pulled out of the die groove 111. The robot picks up the product 200 and separates the product 200 from the core pulling structure 30 to complete the material removal.

[0087] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. An injection mold, It is characterized in that It includes a fixed mold, a movable mold and a core pulling structure. The fixed mold is provided with a concave mold groove on the surface facing the movable mold. When the movable mold and the fixed mold are molded together, the concave mold groove is closed to form a cavity. The core pulling structure includes: A first row seat, the first row seat can be slidably arranged to approach or move away from the die groove; a second row seat, the second row seat being slidably disposed on the first row seat to approach or move away from the die groove, and having a first position, a second position and a third position, at least a portion of the second row seat gradually shrinking toward the direction approaching the die groove and forming two guide inclined surfaces arranged back to back, and a first core being disposed at one end of the second row seat facing the die groove; and Two undercut inserts, both of which are arranged on the first row seat, each of which is slidably connected to one of the guide slopes, and a second core is arranged at one end of the undercut insert facing the concave die groove; Wherein, when the second slide seat is located at the first position, the first core and the two second cores are both located at the die groove, and during the sliding process of the second slide seat between the first position and the second position, each undercut insert slides relative to the corresponding guide inclined surface to approach or move away from another undercut insert; The second row seat is locked with the first row seat when the position moves from the second position to the third position, so as to drive the first row seat and the undercut insert to slide.

2. The injection mold according to claim 1, It is characterized in that One of the first slider seat and the second slider seat is provided with a strip hole extending along the sliding direction of the second slider seat, and the other of the first slider seat and the second slider seat is provided with a positioning pin; The positioning pin is inserted into the strip-shaped hole, and when the second row seat is between the second position and the third position, the positioning pin abuts against one end side wall of the strip hole to lock the second row seat with the first row seat; And / or, the undercut insert is provided with one of a sliding portion and a sliding groove, the guide inclined surface is provided with the other of the sliding portion and the sliding groove, and the sliding portion is provided in the sliding groove.

3. The injection mold according to claim 1, It is characterized in that A first limiting groove and two second limiting grooves are formed on the top surface of the first position seat, the first limiting groove extends along the sliding direction of the second position seat, and the second position seat is arranged in the first limiting groove; The two second limiting grooves are respectively arranged at two sides of the first limiting groove, and each of the undercut inserts is arranged in one of the second limiting grooves.

4. The injection mold according to claim 3, It is characterized in that The first slide seat includes a seat body and a slide insert, the seat body is slidably connected to the fixed mold, the slide insert is detachably arranged on the top surface of the seat body, and the second limiting groove and at least part of the first limiting groove are opened in the slide insert.

5. The injection mold according to claim 4, It is characterized in that A limiting portion is convexly provided on the top surface of the seat body, and the limiting portion is located on a side of the slide insert away from the die groove; And / or, the top surface of the seat body is provided with one of a clamping portion and a clamping groove, the bottom surface of the slide insert is provided with the other of the clamping portion and the clamping groove, and the clamping portion is arranged in the clamping groove.

6. The injection mold according to claim 3, It is characterized in that The core pulling structure further includes a cover structure, and the cover structure is arranged to cover the first limiting groove and the second limiting groove; And / or, the core-pulling structure further comprises an elastic positioning member, one end of which is protruding from the groove wall of the first limiting groove, and the side wall of the second position seat is provided with at least two positioning holes arranged in sequence along the sliding direction, and when the second position seat is located at the first position and the second position, the elastic positioning member is respectively held in one of the positioning holes; And / or, the second limit groove includes a connected sliding section and an avoidance section, the avoidance section is connected to the first limit groove and extends toward one side of the die groove, the sliding section extends from the avoidance section in a direction away from the first limit groove, the undercut insert includes a main body and a guide part, the main body is arranged on the avoidance section and is provided with the second core, the main body is slidably connected to the guide inclined surface, and the guide part is protruding on the side of the main body away from the second row seat, and is arranged on the sliding section.

7. The injection mold according to claim 1, It is characterized in that The injection mold further comprises an inclined guide piece, which extends from the movable mold toward the fixed mold and is inclined in a direction away from the concave mold groove along the sliding direction of the second row seat; An inclined hole is formed on the top surface of the second row seat, and the inclined hole extends in a depth direction away from the die groove. The inclined guide piece can enter and exit the inclined hole to drive the second row seat to slide.

8. The injection mold according to claim 7, It is characterized in that The injection mold further comprises a limit block, which is arranged on the movable mold. When the movable mold is clamped on the fixed mold, at least part of the limit block is located on a side of the second row seat away from the die groove and contacts the second row seat.

9. The injection mold according to claim 8, It is characterized in that The surface of the limiting block facing the second position seat is inclined away from the core pulling structure to form a limiting surface, and the surface of the second position seat facing away from the die groove is inclined away from the die groove and is arranged opposite to the limiting surface; And / or, a buffer is provided on the surface of the limiting block facing the core-pulling structure.

10. The injection mold according to any one of claims 1 to 9, It is characterized in that The core-pulling structure is arranged on the fixed mold in a liftable manner; And / or, the injection mold further includes a position sensor, which is disposed on the fixed mold and is used to detect the position of the first row seat or the second row seat.

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