Long-stroke core-pulling sliding block mechanism

Abstract

The utility model discloses a long-stroke core-pulling sliding block mechanism. The long-stroke core-pulling sliding block mechanism comprises a guide rail piece and a large sliding block assembled on the guide rail piece in a sliding mode. The large sliding block can slide relative to the guide rail piece in the front-back direction. The core-pulling rack drives the large sliding block to slide relative to the guide rail piece; the sliding rail containing groove is formed in the lower surface of the large sliding block in a sunken mode, and at least part of the guide rail piece is embedded into the sliding rail containing groove; a first inner groove face, two second inner groove faces and two third inner groove faces which are parallel to the front-back direction are formed in the sliding rail containing groove, and the two third inner groove faces are parallel to each other. A first guide rail face attached to the first inner groove face in a matched mode, two second guide rail faces attached to the second inner groove faces in a matched mode and two third guide rail faces attached to the third inner groove faces in a matched mode are formed on the portion, implanted into the sliding rail containing groove, of the guide rail piece. Any two of the first inner groove face, any one second inner groove face and any one third inner groove face are not parallel to each other and not overlapped with each other.

Description

Technical Field

[0001] This application relates to the field of molds, and particularly to a long-stroke core-pulling slider mechanism. Background Art

[0002] When an injection-molded product is injection-molded, due to its own structure, a longitudinal core-pulling mold needs to be made in a mold structure for lateral demolding to form an undercut recess structure in the injection-molded product. For examples of related injection-molded products, reference can be made to Figure 1 and Figure 2 As shown, a schematic injection-molded product 6 is disclosed, which is made of an injection-molding material through injection molding and includes a main body shell 60. One end of the main body shell 60 in the lateral direction forms an opening 61, and an undercut recess 62 is formed by inward depression on the inner wall of the main body shell 61. When injection-molding such an injection-molded product 6, the undercut recess 62 needs to be demolded by designing a longitudinal core-pulling mold perpendicular to the lateral direction.

[0003] In such a core-pulling mold structure, some core-pulling sliders need to be designed to be thin and long to meet the structural requirements of the molded product. In a slender core-pulling slider structure, the driving force for driving the long-stroke core-pulling slider during mold opening is generally eccentric at the tail. During operation, it is easy to get stuck and swing unstably due to the assembly gap on both sides, resulting in defects. The core-pulling slider and the slide rail it cooperates with.

[0004] Therefore, it is necessary to study a new long-stroke core-pulling slider mechanism (the cooperation structure between the core-pulling slider and the slide rail) to solve the above problems. Utility Model Content

[0005] The purpose of this application is to propose a new long-stroke core-pulling slider mechanism to solve the disadvantages existing in the prior art.

[0006] To achieve the above purpose, this application provides the following technical solutions:

[0007] A long-stroke core-pulling slider mechanism includes an upper mold assembly, a lower mold assembly, and a slider demolding assembly. The upper mold assembly and the lower mold assembly can be opened and closed in the up and down direction. When the upper mold assembly and the lower mold assembly are closed, they are stacked together to form an injection cavity. The slider demolding assembly is implanted between the upper mold assembly and the lower mold assembly. The slider demolding assembly includes:

[0008] A guide rail member, fixed on the lower mold assembly and extending in the front and rear direction;

[0009] A large slider, slidably assembled on the guide rail member, and the large slider can slide relative to the guide rail member in the front and rear direction;

[0010] The slider insert is fixed or integral with one end of the large slider. When the mold is closed, the slider insert is implanted into the injection cavity. When the mold is opened, the slider insert is pulled out from the plastic cavity.

[0011] The core-pulling rack drives the large slider to slide relative to the guide rail member in the front-back direction during the opening and closing processes of the upper mold assembly and the lower mold assembly.

[0012] The slide rail receiving groove is recessed on the lower surface of the large slider in the up-down direction. The slide rail receiving groove extends in the front-back direction, and at least part of the guide rail member is implanted into the slide rail receiving groove to enable the large slider to be slidably disposed on the guide rail member.

[0013] The slide rail receiving groove is formed with a first inner groove surface parallel to the front-back direction, two second inner groove surfaces parallel to the front-back direction, and two third inner groove surfaces parallel to the front-back direction. The two third inner groove surfaces are parallel to each other.

[0014] The part of the guide rail member implanted into the slide rail receiving groove is formed with a first guide rail surface respectively matching and fitting with the first inner groove surface, two second guide rail surfaces matching and fitting with the second inner groove surfaces, and two third guide rail surfaces matching and fitting with the third inner groove surfaces, where

[0015] Any two of the first inner groove surface, any one of the second inner groove surfaces, and any one of the third inner groove surfaces are not parallel and do not overlap with each other.

[0016] Further, a horizontal plane perpendicular to the up-down direction is defined. The first inner groove surface is parallel to the horizontal plane, and the second inner groove surface intersects the horizontal plane.

[0017] Further, the third inner groove surface is perpendicular to the horizontal plane.

[0018] Further, fourth inner groove surfaces extend downward respectively on both sides of the first inner groove surface. The lower edges of the fourth inner groove surfaces are correspondingly connected to the second inner groove surfaces. The two second inner groove surfaces extend downward and incline towards each other, and the fourth inner groove surface is perpendicular to the horizontal plane.

[0019] Further, the lower edges of each of the second inner groove surfaces further extend downward to form the third inner groove surface, and the third inner groove surface is perpendicular to the horizontal plane.

[0020] Further, the slide rail receiving groove sequentially includes a connected first slide rail groove section and a second slide rail groove section from top to bottom;

[0021] In the cross-section perpendicular to the front-back direction, the cross-section of the first slide rail groove section is formed such that the width in all directions decreases linearly from top to bottom;

[0022] In a cross-section perpendicular to the front-rear direction, the cross-section of the second slide rail groove section is formed to have an equal width in all directions from top to bottom.

[0023] Furthermore, the slide rail accommodating groove sequentially includes a connected third slide rail groove section, a first slide rail groove section, and a second slide rail groove section from top to bottom;

[0024] In a cross-section perpendicular to the front-rear direction, the cross-section of the third slide rail groove section is formed to have an equal width in all directions from top to bottom;

[0025] In a cross-section perpendicular to the front-rear direction, the cross-section of the first slide rail groove section is formed to have a linearly decreasing width in all directions from top to bottom;

[0026] In a cross-section perpendicular to the front-rear direction, the cross-section of the second slide rail groove section is formed to have an equal width in all directions from top to bottom.

[0027] Furthermore, the core-pulling rack is fixed on the upper mold assembly and is located on both sides of the large slider in the left-right direction. The core-pulling rack is in inclined surface cooperation with the large slider and is mutually restricted in the front-rear direction. The core-pulling rack moves in the up-down direction to drive the large slider to move in the front-rear direction.

[0028] Furthermore, a plurality of inclined grooves that are spaced adjacent to each other are formed on both side surfaces of the large slider, and inclined ribs that are matched with the inclined grooves are formed on the corresponding inner side surfaces of the core-pulling rack. The inclined ribs are engaged with the inclined grooves to form an inclined surface cooperation.

[0029] Furthermore, a guiding groove is recessed on the outer side surface of the core-pulling rack in the left-right direction, and the guiding groove extends in the up-down direction;

[0030] A rack guiding block is fixed on the lower mold assembly, and a guiding convex block that is correspondingly limited in the guiding groove protrudes from the rack guiding block.

[0031] Compared with the prior art, the beneficial effect of the present application is that it can ensure that the large slider is not easily jammed during mold closing and mold opening and is more accurately positioned left and right with the guide rail member. Description of the Drawings

[0032] Figure 1 is a schematic three-dimensional view of the structure of an injection molded product exemplified in the present application.

[0033] Figure 2 is Figure 1 a cross-sectional view of the injection molded product in

[0034] Figure 3 is a schematic three-dimensional view of the long-stroke core-pulling slider mechanism of the present application.

[0035] Figure 4 is Figure 3 A three-dimensional schematic diagram of the long-stroke core-pulling slider mechanism shown in after removing the upper die foot component and the lower die foot component, further showing a three-dimensional exploded schematic diagram after the separation of the upper die component.

[0036] Figure 5 is Figure 4 A further three-dimensional exploded schematic diagram of the long-stroke core-pulling slider mechanism after removing the upper die foot component and the lower die foot component shown in , specifically showing a three-dimensional schematic diagram after the separation of the upper die component, the lower die component, and the slider demolding component.

[0037] Figure 6 Is a top view of the long-stroke core-pulling slider mechanism of the present application after removing the upper die foot component and the lower die foot component.

[0038] Figure 7 is from Figure 6 A cross-sectional view taken along line A-A in , specifically showing a state diagram after the upper die component and the lower die component are closed.

[0039] Figure 8 is Figure 7 An enlarged view of the structure within the dashed box in .

[0040] Figure 9 Is a three-dimensional schematic diagram of the slider demolding component of the long-stroke core-pulling slider mechanism of the present application.

[0041] Figure 10 is Figure 9 A partial three-dimensional exploded view of the slider demolding component shown in , where Figure 10 The viewing angle is the same as that of Figure 9 the same.

[0042] Figure 11 is Figure 9 A partial three-dimensional exploded view of the slider demolding component shown in , where Figure 11 The viewing angle is different from that of Figure 9 different.

[0043] Figure 12 is Figure 11 A further three-dimensional exploded view of the slider demolding component shown in , where Figure 12 The viewing angle is the same as that of Figure 11 the same.

[0044] Figure 13 is Figure 9 A top view of the slider demolding component shown in .

[0045] Figure 14 is from Figure 13 A cross-sectional view taken along line B-B in .

[0046] Figure 15is from Figure 13 A sectional view taken along line C-C in

[0047] Figure 16 is from Figure 13 A sectional view taken along line D-D in

[0048] Figure 17 is Figure 16 An enlarged view of the structure within the dashed box in

[0049] Figure 18 is another embodiment of the present application, specifically Figure 17 An alternative embodiment of the structure shown in Detailed implementation manners

[0050] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0051] For a more accurate description throughout this application, all directions mentioned shall be uniformly based on Figure 5 as a reference. Define the direction where the X-axis is located as the front-back direction, where the positive direction of the X-axis is the back; define the direction where the Y-axis is located as the up-down direction, where the positive direction of the Y-axis is the up; define the direction where the Z-axis is located as the left-right direction.

[0052] Please refer to Figures 3 to 16 shown, which is a long-stroke core-pulling slider mechanism disclosed in the present application. The long-stroke core-pulling slider mechanism includes an upper die foot assembly 101, an upper die assembly 1, a lower die assembly 2, a lower die foot assembly 102, and a slider demolding assembly 3. The upper die foot assembly 101, the upper die assembly 1, the lower die assembly 2, and the lower die foot assembly 102 are stacked in the up-down direction. The upper die assembly 1 and the lower die assembly 2 can open and close in the up-down direction. The slider demolding assembly 3 is implanted between the upper die assembly 1 and the lower die assembly 2. The upper die assembly 1 and the lower die assembly 2 are stacked together to enclose an injection cavity (not labeled, which is actually Figure 7 the cavity area where the injection product 6 is formed in

[0053] Further, the slider demolding assembly 3 includes a rail member 31, a large slider 32, a large slider lifter 33, a small slider lifter 34, a center slider 35, a slider insert 36, a small slider 37 and a core-pulling rack 38 which cooperate with each other. Among them, the rail member 31 is fixed on the upper mold assembly 1 and extends in the front-rear direction. The large slider 32 is slidably assembled on the rail member 31. Specifically, a slide rail receiving groove 325 is formed by recessing the lower end position of the large slider 32 in the up-down direction, and the slide rail receiving groove 325 extends in the front-rear direction. At least part of the rail member 31 is implanted into the slide rail receiving groove 325 to realize the slidable assembly of the large slider 32 on the rail member 31. The large slider 32 can slide relative to the rail member 31 in the front-rear direction. The large slider lifter 33 is disposed in a large slider lifter hole 321 formed in the large slider 32 in the up-down direction perpendicular to the front-rear direction. The large slider lifter 33 straddles the rail member 31, and the large slider lifter 33 can move relative to the rail member 31 in the up-down direction. The small slider lifter 34 is disposed in a small slider lifter hole 322 formed in the large slider 32 in the up-down direction. The small slider lifter 34 can move relative to the rail member 31 in the up-down direction. The center slider 35 extends in a long strip shape in the front-rear direction. The first end of the center slider 35 is inserted into a small slider receiving portion 323 formed in the large slider 32. The end of the first end of the center slider 35 is in inclined surface cooperation with the large slider lifter 33. The slider insert 36 is sleeved around the second end of the center slider 35, and the slider insert 36 is fixed to one end of the large slider 32. The small slider 37 is disposed in a small slider hole 361 formed in the slider insert 36 in the up-down direction. The small slider 37 is limited in the front-rear direction by the small slider hole 361 and can move relative to the slider insert 36 in the up-down direction. The upper edge of the small slider 37 protrudes upward from the slider insert 36. The lower end position of the small slider 37 is in inclined surface cooperation with the center slider 35. The lower end position of the small slider lifter 34 is in inclined surface cooperation with the center slider 35.

[0054] Please refer to Figure 7 , Figure 8 and Figure 12As shown, a limiting block 39 is also fixedly arranged below the central slider 35, and a limiting groove 326 for accommodating the limiting block 39 is formed at the corresponding position of the large slider 32. The limiting groove 326 is open forward. The slider demolding assembly 3 further includes an adapter 30. The adapter 30 is sleeved on the outer periphery of one end of the slider insert 36. The slider insert 36 is locked to one end of the large slider 32 through the adapter 30. The end face of the adapter 30 adjacent to the large slider 32 seals the forward opening of the limiting groove 326, thereby limiting the limiting block 39 in the limiting groove 326 in the front-rear direction. The limiting block 39 can slide in the limiting groove 326 in the front-rear direction. Such a setting enables the central slider 35 to slide relative to the large slider 32 in a certain range (that is, within the delay length of the limiting groove 326 in the front-rear direction) in the front-rear direction.

[0055] Please refer to Figures 3 to 9 As shown, the upper end of the large slider lifter 33 is fixed to the upper die assembly 1. The upper end of the small slider lifter 34 is fixed to the upper die assembly 1. The core-pulling rack 38 extends in the up-down direction and has a quadrilateral cross-section. The upper end position of the core-pulling rack 38 is fixedly arranged on the upper die assembly 1 through bolts. In the left-right direction perpendicular to the front-rear direction and the up-down direction, the core-pulling rack 38 is located on both sides of the large slider 32. The core-pulling rack 38 is in inclined surface fit with the large slider 32. The core-pulling rack 38 moves in the up-down direction to drive the large slider 32 to move in the front-rear direction.

[0056] Please refer to Figures 5 to 14 As shown, specifically, in a preferred embodiment, inclined grooves 324 are formed on both side surfaces of the large slider 32. Inclined ribs 381 that cooperate with the inclined grooves 324 are formed on the corresponding inner side surfaces of the core-pulling rack 38. The inclined ribs 381 are engaged with the inclined grooves 324 to form an inclined surface fit. Further, a delay gap 380 is formed in the front-rear direction (refer to Figure 14 As shown, that is, the width of the inclined groove 324 is greater than the width of the inclined rib 381). In a better embodiment, a plurality of inclined grooves 324 are provided and are adjacent at intervals. A plurality of inclined ribs 381 are provided and are adjacent at intervals. When the upper die assembly 1 and the lower die assembly 2 are opened and closed, the up-down movement of the core-pulling rack 38 relative to the lower die assembly 2 can drive the large slider 32 to move in the front-rear direction. The setting of the delay gap 380 enables the movement of the core-pulling rack 38 driving the large slider 32 to lag and delay for a specific time (preset time) as required.

[0057] Please refer to Figures 9 to 12As shown, a guiding groove 382 is formed by recessing the outer side surface of the core-pulling rack 38 in the left-right direction. The guiding groove 382 extends in the up-down direction. The slider demolding assembly 3 further includes a rack guiding block 383. The rack guiding block 383 is fixed to the lower die assembly 2 by bolts. A guiding projection 3831 is formed protruding from the rack guiding block 383 and correspondingly limited within the guiding groove 382. By the arrangement of the rack guiding block 383 in cooperation with the guiding groove 382 on the core-pulling rack 38, it can be realized that the movement track of the core-pulling rack 38 in the up-down direction is controllable and precise.

[0058] Please refer to Figures 5 to 15 As shown. One end surface of the large slider lifter 33 in the front-back direction forms an inclined surface (not labeled). The end of the first end of the center slider 35 forms a mating inclined surface (not labeled). The inclined surface of the large slider lifter 33 and the mating inclined surface of the center slider 35 form an inclined surface fit. In this way, it can be realized that when the large slider lifter 33 moves downward in the up-down direction, the large slider lifter 33 drives the center slider 35 to move forward in the front-back direction; when the large slider lifter 33 moves upward in the up-down direction, the large slider lifter 33 has no driving effect on the center slider 35. In addition, an inclined convex column 341 is formed at the lower end position of the small slider lifter 34, and a mating inclined groove 351 is formed at the position of the center slider 35 corresponding to the inclined convex column 341 (the mating inclined groove 351 can be a through hole in the up-down direction or a notch-shaped recessed inward from one side of the center slider 35. The mating inclined groove 351 shown in the embodiment of the attached drawings of the present application specification is a notch-shaped one). The inclined convex column 341 is correspondingly implanted and limited within the mating inclined groove 351 to form an inclined surface fit. When the small slider lifter 34 moves downward in the up-down direction, the small slider lifter 34 drives the center slider 35 to move forward in the front-back direction. When the small slider lifter 34 moves upward in the up-down direction, the small slider lifter 34 drives the center slider 35 to move backward in the front-back direction.

[0059] Please refer to Figure 11 and Figure 12As shown, on both sides of the guide rail member 31 corresponding to the position of the large slider shoveling machine 33, limiting grooves 311 are formed. The large slider shoveling machine 33 straddles the guide rail member 31 and is formed with lower end limiting feet 331 that are correspondingly limited within the limiting grooves 311 along the front-rear direction. The lower end limiting feet 331 include straight section portions 3311, and the straight section portions 3311 are located below the inclined surfaces where the large slider shoveling machine cooperates with the end inclined surfaces of the first ends of the center sliders 35. The large slider shoveling machine 33 can move relative to the guide rail member 31 in the up-down direction. The large slider shoveling machine 33 cannot move relative to the guide rail member 31 in the front-rear direction and the left-right direction. When the straight section portions 3311 move downward and are inserted into the limiting grooves 311, the large slider 32 stops moving forward.

[0060] Please refer to Figures 9 to 14 As shown, the slider demolding assembly 3 of the present application further includes limiting side plates 4. The limiting side plates 4 are locked to the lower mold assembly 2 by nuts and are abutted against both sides of the guide rail member 31. The limiting side plates 4 are located below the large slider 32 in the up-down direction. At a position on the side of the limiting side plates 4 close to the guide rail member 31, a limiting groove portion 41 is formed through along the up-down direction. The large slider shoveling machine 33 straddles the guide rail member 31 and is formed with lower end limiting feet 331 that are correspondingly limited within the limiting groove portion 41 along the front-rear direction. The structural function of the limiting groove portion 41 is the same as that of the above-mentioned limiting groove 311. In the attached drawings of the specification of the present application, the limiting groove portion 41 and the lower end limiting feet 331 are shown not to be in close fit along the front-rear direction. The illustration is only for reference. In the actual mold structure, in order to achieve the front-rear direction limitation of the lower end limiting feet 331 by the limiting groove portion 41, the limiting groove portion 41 and the lower end limiting feet 331 can be designed to be in close fit.

[0061] The slider demolding assembly 3 of the present application further includes a stop member 5. The stop member 5 is locked to the lower mold assembly 2 by nuts and is located below the guide rail member 31. A notch portion 312 that straddles the stop member 5 is formed at the lower edge of the guide rail member 31 along the up-down direction. The stop member 5 limits the guide rail member 31 in the front-rear direction. When the large slider shoveling machine 33 moves downward to the extreme position along the up-down direction, the large slider shoveling machine 33 is stopped downward by the stop member 5.

[0062] Please refer to Figures 9 to 12 、 Figures 16 to 18 As shown, the slide rail receiving groove 325 is recessed in the lower surface of the large slider 32 along the up-down direction. The slide rail receiving groove 325 extends along the front-rear direction. At least a part of the guide rail member 31 is implanted into the slide rail receiving groove 325 to realize that the large slider 32 is slidably arranged on the guide rail member 31. In one embodiment ( Figure 18In the illustrated embodiment), the slide rail receiving groove 325 is formed with a first inner groove surface 3251 parallel to the front-rear direction, two second inner groove surfaces 3252 parallel to the front-rear direction, and two third inner groove surfaces 3253 parallel to the front-rear direction. The two third inner groove surfaces 3253 are parallel to each other. The portion of the guide rail member 31 implanted in the slide rail receiving groove 325 is formed with a first guide rail surface 301 that fits and adheres to the first inner groove surface 3251 respectively, two second guide rail surfaces 302 that fit and adhere to the second inner groove surfaces 3252, and two third guide rail surfaces 303 that fit and adhere to the third inner groove surfaces 3253, wherein any two of the first inner groove surface 3251, any one of the second inner groove surfaces 3252, and any one of the third inner groove surfaces 3253 are not parallel and do not overlap with each other.

[0063] In this application, a horizontal plane perpendicular to the up-down direction is defined (not shown, actually a virtual plane). Preferably, the first inner groove surface 3251 is parallel to the horizontal plane. Preferably, the second inner groove surface 3252 intersects with the horizontal plane. Preferably, the third inner groove surface 3253 is perpendicular to the horizontal plane. In this embodiment ( Figure 18 In the illustrated embodiment), the slide rail receiving groove 325 successively includes a first slide rail groove section (not labeled) and a second slide rail groove section (not labeled) that are communicated from top to bottom. In a cross-section perpendicular to the front-rear direction, the cross-section of the first slide rail groove section is formed such that the width in all directions decreases linearly from top to bottom (for example, an inverted isosceles trapezoid). In a cross-section perpendicular to the front-rear direction, the cross-section of the second slide rail groove section is formed such that the width in all directions is equal from top to bottom (for example, a rectangle). Through the cooperation structure of the slide rail receiving groove 325 and the guide rail member 31 designed in this application, it can ensure a smaller frictional force during startup (when mold opening and closing) and also ensure the positioning accuracy between the two, thereby ensuring that the long-stroke slider (here referring to the large slider 32) is not easily jammed during mold closing and demolding.

[0064] Please refer to Figure 17 For Figure 18 an alternative embodiment of the illustrated embodiment, Figure 17In the illustrated embodiment, fourth inner groove surfaces 3254 extend downwardly from both sides of the first inner groove surface 3251 respectively. The lower edges of the fourth inner groove surfaces 3254 are correspondingly connected to the second inner groove surfaces 3252. The two second inner groove surfaces 3252 extend downwardly and towards each other. The fourth inner groove surfaces 3254 are perpendicular to the horizontal plane. The lower edges of the respective second inner groove surfaces 3252 further extend downwardly to form the third inner groove surfaces 3253, and the third inner groove surfaces 3253 are perpendicular to the horizontal plane. The slide rail accommodating groove 325 sequentially includes, from top to bottom, a connected third slide rail section (not labeled), a first slide rail section (not labeled), and a second slide rail section (not labeled). In a cross-section perpendicular to the front-rear direction, the cross-section of the third slide rail section is formed to have an equal width in all directions from top to bottom. In a cross-section perpendicular to the front-rear direction, the cross-section of the first slide rail section is formed to have a linearly decreasing width in all directions from top to bottom. In a cross-section perpendicular to the front-rear direction, the cross-section of the second slide rail section is formed to have an equal width in all directions from top to bottom. Similarly, it can ensure a small frictional force during startup (when the mold is opened and closed) and also ensure the positioning accuracy between the two. Similarly, it can ensure that the long-stroke slider (here referring to the large slider 32) is not easily stuck during mold closing and demolding.

[0065] The following details the actuation process of the long-stroke core-pulling slider mechanism of the present application with reference to the accompanying drawings:

[0066] During mold closing:

[0067] First step: The upper mold assembly 1 synchronously drives the large slider lifter 33, the small slider lifter, and the core-pulling rack 38 downward; the downward movement of the core-pulling rack 38 drives the large slider 32, the center slider 35, the slider insert 36, and the small slider 37 to move forward in the front-rear direction. During this process, the large slider lifter 33 and the small slider lifter 34 have not yet been inserted into the position for driving the center slider 35.

[0068] Step 2: The upper die assembly 1 drives the large slider lifter 33, the small slider lifter, and the core-pulling rack 38 to move further downward until the inclined stud 341 of the small slider lifter 34 is inserted into the mating inclined groove 351. The downward movement of the small slider lifter 34 drives the center slider 35 to move forward. During this process, the large slider lifter 33 moves downward synchronously with the small slider lifter 34 and restricts the forward movement of the large slider 32 (mainly achieved through the straight section 3311 and the upright end wall at the rear end of the large slider lifter 33). Since the slider insert 36 is fixed to the large slider 32, the forward movement of the center slider 35 is also a forward movement relative to the slider insert 36 and the large slider 32. The front end of the center slider 35 pushes up the small slider 37, and the upper edge of the small slider 37 is pushed out of the small slider hole 361 on the slider insert 36. During this process, since the large slider 32 is restricted by the large slider lifter 33 and remains stationary in the front-rear direction, and the core-pulling rack 38 moves downward synchronously with the large slider lifter 33 and the small slider lifter 34, the above-mentioned time-delay gap 380 comes into play to absorb the relative movement until the mold closing is in place.

[0069] During mold opening:

[0070] Step 1: The small slider lifter 34, the large slider lifter 33, and the core-pulling rack 38 move upward together with the upper die assembly 1. The inclined stud 341 of the small slider lifter 34 cooperates with the inclined groove 351 to drive the upward movement of the small slider lifter 34 to drive the center slider 35 to move backward, and then synchronously drive the small slider 37 to move downward. During this process, due to the straight section 3311 and the upright end wall at the rear end of the large slider lifter 33, while the large slider lifter 33 moves upward at the initial stage of mold opening, the large slider 32 remains stationary in the front-rear direction. In addition, the slider insert moves synchronously with the large slider 32 and also remains stationary in the front-rear direction. The above-mentioned time-delay gap 380 is used to absorb the upward movement of the core-pulling rack 38.

[0071] Step 2: The small slider lifter 34, the large slider lifter 33, and the core-pulling rack 38 move upward together with the upper die assembly 1 until the small slider lifter 34 disengages from the small slider accommodation 323 of the center slider 35; at this time, the large slider lifter 33 also disengages from braking the large slider 32, and the small slider 37 also moves downward to the limit position and disengages from the injection molded product 6; after the core-pulling rack 38 absorbs the time-delay gap 380, the inclined rib 381 abuts against the inner surface of the inclined groove 324 correspondingly. The further upward movement of the core-pulling rack 38 drives the large slider 32 to move backward. At this time, the slider insert 36, the center slider 35, and the small slider 37 move backward synchronously with the large slider 32 until the mold is completely opened.

[0072] Through the long-stroke core-pulling slider mechanism designed in this application, the demolding action of the undercut recess 62 in the injection-molded product 6 can be stably and effectively realized. At the same time, the front and rear demolding actions of the central slider 35 and the large slider 32 are skillfully linked through the opening die action of the core-pulling rack 38 in the up and down direction, so as to avoid excessive demolding strokes in the front and rear directions and achieve the miniaturized design of the long-stroke core-pulling slider mechanism.

[0073] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A long-stroke core-pulling slider mechanism, comprising an upper mold assembly (1), a lower mold assembly (2) and a slider demoulding assembly (3), wherein the upper mold assembly (1) and the lower mold assembly (2) can be opened and closed in the up-and-down direction, and when the upper mold assembly (1) and the lower mold assembly (2) are closed, they are stacked together to form an injection cavity, and the slider demoulding assembly (3) is implanted between the upper mold assembly (1) and the lower mold assembly (2), characterized in that: The slider demoulding assembly (3) comprises: A guide rail member (31) is fixed on the lower mold assembly (2) and extends in the front-rear direction; A large sliding block (32), the sliding block being arranged on the guide rail member (31), and the large sliding block (32) being able to slide relative to the guide rail member (31) in a front-rear direction; A slider insert (36) is fixed or integrated with one end of the large slider (32). When the mold is closed, the slider insert (36) is implanted into the injection cavity. When the mold is opened, the slider insert (36) is pulled out of the cavity. A core pulling rack (38) drives the large slide block (32) to slide relative to the guide rail member (31) along the front-rear direction during the mold opening and closing process of the upper mold assembly (1) and the lower mold assembly (2); A slide rail receiving groove (325) is formed concavely on the lower surface of the large slider (32) along the up-down direction, the slide rail receiving groove (325) extends along the front-back direction, and at least a portion of the guide rail member (31) is implanted in the slide rail receiving groove (325) to realize the sliding assembly of the large slider (32) on the guide rail member (31); The slide rail receiving groove (325) is formed with a first inner groove surface (3251) parallel to the front-rear direction, two second inner groove surfaces (3252) parallel to the front-rear direction, and two third inner groove surfaces (3253) parallel to the front-rear direction, and the two third inner groove surfaces (3253) are parallel to each other; The portion of the guide rail member (31) implanted in the slide rail receiving groove (325) is formed with a first guide rail surface (301) respectively matched with the first inner groove surface (3251), two second guide rail surfaces (302) matched with the second inner groove surface (3252), and two third guide rail surfaces (303) matched with the third inner groove surface (3253), wherein Any two of the first inner groove surface (3251), any one of the second inner groove surfaces (3252), and any one of the third inner groove surfaces (3253) are not parallel to each other and do not overlap.

2. The long-stroke core-pulling slider mechanism according to claim 1, characterized in that: A horizontal plane perpendicular to the up-down direction is defined, the first inner groove surface (3251) is parallel to the horizontal plane, and the second inner groove surface (3252) intersects with the horizontal plane.

3. The long-stroke core-pulling slider mechanism according to claim 2, characterized in that: The third inner groove surface (3253) is perpendicular to the horizontal plane.

4. The long-stroke core-pulling slider mechanism according to claim 3, characterized in that: Fourth inner groove surfaces (3254) extend downwardly from both sides of the first inner groove surface (3251), and the lower edge of the fourth inner groove surface (3254) is correspondingly connected to the second inner groove surface (3252). The two second inner groove surfaces (3252) extend downwardly and inclined toward each other, and the fourth inner groove surface (3254) is perpendicular to the horizontal plane.

5. The long-stroke core-pulling slider mechanism according to claim 4, characterized in that: The lower edge of each of the second inner groove surfaces (3252) further extends downward to form the third inner groove surface (3253).

6. The long-stroke core-pulling slider mechanism according to any one of claims 1 to 5, characterized in that: The slide rail receiving groove (325) comprises, from top to bottom, a first slide rail groove section and a second slide rail groove section that are connected; Along the cross section perpendicular to the front-rear direction, the cross section of the first slide rail groove section is formed such that the width along all directions decreases linearly from top to bottom; Along the cross section perpendicular to the front-rear direction, the cross section of the second slide rail groove section is formed to have the same width from top to bottom along all directions.

7. The long-stroke core-pulling slider mechanism according to any one of claims 1 to 5, characterized in that: The slide rail receiving groove (325) comprises, from top to bottom, a third slide rail groove section, a first slide rail groove section and a second slide rail groove section which are connected to each other; Along the cross section perpendicular to the front-rear direction, the cross section of the third slide rail groove section is formed to have the same width from top to bottom along all directions; Along the cross section perpendicular to the front-rear direction, the cross section of the first slide rail groove section is formed such that the width along all directions decreases linearly from top to bottom; Along the cross section perpendicular to the front-rear direction, the cross section of the second slide rail groove section is formed to have the same width from top to bottom along all directions.

8. The long-stroke core-pulling slider mechanism according to any one of claims 1 to 5, characterized in that: The core pulling rack (38) is fixed on the upper mold assembly (1) and is located on both sides of the large slider (32) in the left-right direction. The core pulling rack (38) cooperates with the inclined surface of the large slider (32) and restricts each other in the front-to-back direction. The core pulling rack (38) moves in the up-down direction to drive the large slider (32) to move in the front-to-back direction.

9. The long-stroke core-pulling slider mechanism according to claim 8, characterized in that: A plurality of adjacent inclined grooves (324) are formed on both side surfaces of the large slider (32), and an inclined convex rib (381) matching with the inclined groove (324) is formed on the corresponding inner side surface of the core pulling rack (38), and the inclined convex rib (381) is meshed with the inclined groove (324) to form an inclined surface match.

10. The long-stroke core-pulling slider mechanism according to any one of claims 1 to 5, characterized in that: The outer side surface of the core pulling rack (38) along the left-right direction is recessed to form a guide groove (382), and the guide groove (382) extends along the up-down direction; The rack guide block (383) is fixed on the lower mold assembly (2), and the rack guide block (383) is protruded to form a guide protrusion (3831) corresponding to the guide groove (382).

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