Core pulling assembly and double-color mold

Abstract

The utility model relates to a core pulling assembly and a double-color mold, and belongs to the technical field of double-color injection molding. The sliding block is provided with a first cavity for accommodating the shovel base, a second cavity for accommodating the elastic guide part and a positioning groove matched with the expansion and contraction part; the elastic guide part is obliquely arranged in the sliding block; in the relaxation state, the head part of the elastic guide part extends into the first cavity; in the compression state, the head part of the elastic guide part is compressed into the second cavity; the expansion and contraction part is arranged at the bottom of the sliding block and has an expansion state for limiting the sliding block and a contraction state for releasing the sliding block; according to the scheme provided by the invention, the movement of the sliding block is controlled through the matching between the elastic guide part and the expansion and shrinkage part, so that the sliding block is prevented from displacing in the film closing process, and the shrinkage deformation of an injection molding part is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of fan assembly, and in particular to a core pulling component and a two-color mold. Background Art

[0002] In the power battery industry, battery modules have wiring harnesses for energy circulation and information transmission. When assembling the battery module, wiring harness isolation plates are required to isolate the wiring harnesses and battery cells to protect them. Wire harness isolation plates are usually made of plastic by two-color injection molding according to the preset battery model.

[0003] A two-color injection mold refers to a mold in which two plastic materials are injected on the same injection molding machine and molded twice, but the product is only ejected once. This molding process is also called double-material injection molding. The mold is generally composed of a one-color fixed mold, a two-color fixed mold, and two movable molds with completely identical structures. During the injection molding process, the one-color fixed mold and the two-color fixed mold are fixed on the injection molding machine, and the two-color injection molding is achieved by rotating the movable mold.

[0004] CN208697882U discloses an injection mold for a space-saving slider in a two-color mold. During the mold opening process of one-color injection molding, the one-color shovel base does not move the oblique guide block, and the slider remains in its original state; during the two-color mold opening, the slider is moved by pulling between the arc surface and the oblique guide block to complete the injection molding. During this mold opening and closing process, the slider is fixed and moved by setting a positioning structure at the bottom of the slider. When the above-mentioned injection mold is applied to injection molded parts with long strip structures such as wiring harness isolation plates, since the positioning structure is a rigid structure, the positioning structure will support the slider during the movement of the slider, causing the slider to shift up and down. When the movable mold rotates, the tension force changes, and the shrinkage deformation of the injection molded part cannot be controlled, causing the wiring harness isolation plate to warp and deform, affecting the sealing reliability and causing certain safety hazards. Utility Model Content

[0005] In order to overcome the problems existing in the related art, the present application provides a core pulling assembly, which controls the movement of the slider through the cooperation between the elastic guide part and the expansion and contraction part to avoid displacement of the slider during the film closing process, so as to reduce the shrinkage deformation of the injection molded part.

[0006] The first aspect of the present application provides a core pulling assembly, comprising:

[0007] The slider has a first chamber for accommodating the shovel base, a second chamber for accommodating the elastic guide portion, and a positioning groove for cooperating with the expansion and contraction portion;

[0008] An elastic guide portion is obliquely arranged in the slider; in a relaxed state, the head of the elastic guide portion extends into the first chamber; in a compressed state, the head of the elastic guide portion is compressed into the second chamber;

[0009] An expansion and contraction portion, disposed at the bottom of the slider, having the function of limiting the expansion state of the slider and releasing the contraction state of the slider;

[0010] The two-color shovel base is provided with a guiding inclined surface matched with the elastic guiding part.

[0011] In the above-mentioned core pulling assembly, the elastic guide part provides a force for lateral movement to the slider, so that the expansion and contraction part can be separated from the positioning groove under the action of this force to realize mold opening, and the expansion and contraction part is in a contracted state after releasing the slider, which does not affect the relative position of the slider, thereby ensuring the tension of the slider and the movable mold assembly during the two-color injection molding process, thereby controlling the shrinkage deformation of the injection molded part.

[0012] In a possible implementation of the first aspect above, the expansion and contraction portion includes an elastomer, which has a first end and a second end relative to each other. When the first end cooperates with the positioning groove, the first end moves away from the second end along the axial direction of the elastomer; when the first end disengages from the positioning groove, the first end moves toward the second end along the axial direction of the elastomer.

[0013] In the above core pulling assembly, when the force exerted by the slider on the elastic body in the positioning groove is greater than its own elastic force, the elastic body contracts under the force, thereby ensuring that the elastic body can be smoothly separated from the positioning groove, thereby allowing the slider to move.

[0014] In a possible implementation of the first aspect above, the elastic body includes a ball and a first elastic component, the ball cooperates with the positioning groove, and the first elastic component reciprocates along its own axial direction.

[0015] When the injection molding machine is performing two-color injection molding, the bead is nested in the positioning groove. At this time, the slider is limited, so that the injection chamber does not change during the injection molding process, thereby reducing the deformation during injection molding. When the bead and the first elastic component are subjected to force, the first elastic component is compressed, so that the bead can be detached from the positioning shaft, thereby releasing the slider, allowing the injection molding machine to complete mold opening.

[0016] In a possible implementation of the first aspect above, the first elastic component is a first spring;

[0017] The expansion and contraction part also includes an annular connecting seat, the shifting ball and the first spring are sequentially nested on the annular connecting seat, and the annular connecting seat is fixed on the movable mold assembly.

[0018] That is, in the implementation of the present application, the annular connecting seat is connected and fixed to the movable mold assembly, and the annular connecting seat can improve the stability and strength between the shifting ball and the first spring, ensuring that the shifting ball and the first spring can adapt to actual production needs.

[0019] In a possible implementation of the first aspect above, the elastic guide portion includes:

[0020] A guide post and a second elastic component, wherein the guide post is connected to the second elastic component, and an end of the second elastic component away from the guide post is inclined toward the bottom of the sliding block.

[0021] That is, in the implementation method of the present application, the inclined elastic guide part can reduce the volume space of the core pulling assembly. When the two-color shovel base moves in the direction away from the slider, the extrusion force is transmitted to the slider by squeezing the guide column, and the expansion and contraction part performs a contraction state.

[0022] In a possible implementation of the first aspect, an arc-shaped guide surface is provided at one end of the guide column away from the second elastic component;

[0023] The second elastic component is a second spring.

[0024] In the above-mentioned fastening structure, the arc-shaped guide surface can reduce the friction damage between the two shovel bases and improve the durability of the elastic guide part.

[0025] In a possible implementation of the first aspect, the core pulling assembly further includes a fixed block, which is located in the second chamber and is detachably connected to the slider;

[0026] The two sides of the fixed block have a first side surface and a second side surface opposite to each other, the first side surface and the bottom end surface of the slider are located on the same horizontal plane, and the second side surface intersects with the bottom end surface of the slider and forms an inclined surface;

[0027] The second spring is vertically arranged on the inclined surface.

[0028] That is, in the implementation of the present application, the fixed block located inside the slider facilitates maintenance of the elastic guide portion.

[0029] In a possible implementation of the first aspect above, the core pulling assembly further includes a slider strip;

[0030] Along the moving direction of the slider, the slider pressure strips are arranged on both sides of the slider and are slidably connected with the slider.

[0031] In the above-mentioned core pulling assembly, the slider pressure strip is used to fix the relative position of the slider in the movable mold assembly to prevent the slider from moving to both sides, thereby ensuring the firmness and mobility of the slider on the movable mold assembly.

[0032] In a possible implementation of the first aspect above, the two-color shovel base has a first side surface and a second side surface relative to each other, the first side surface fits with the inner wall of the first chamber, and the second side surface is recessed toward the first side surface to form the guide slope.

[0033] In the above-mentioned core pulling assembly, the guiding slope on the side of the two-color shovel base can ensure that when the two-color shovel base is pulled out from the slider, there can be enough contact surface to contact the elastic guide part, so that the elastic guide part can be switched between the expanded state and the contracted state.

[0034] The second aspect of the present application is to provide a two-color mold, comprising:

[0035] Two-color fixed mold, movable mold assembly and multiple core pulling assemblies as described above;

[0036] The two-color shovel bases of the plurality of core-pulling assemblies are fixedly arranged on the two-color fixed mold;

[0037] Along the axial direction of the movable mold assembly, a plurality of sliders of the core pulling assembly are arranged on the movable mold assembly.

[0038] The technical solution provided by this application may have the following beneficial effects:

[0039] When the core pulling assembly of the present application is used for injection molding, the injection molding process is as follows: when the two-color shovel base is inserted into the first cavity for mold closing, the guiding bevel in the two-color shovel base contacts the elastic guiding part, so that the force applied by the two-color shovel base during the insertion of the first cavity is absorbed by the elastic guiding part, and the head of the elastic guiding part is compressed into the second cavity, so that the elastic guiding part switches from the relaxed state to the compressed state, and the elastic guiding part does not exert force on the slider. Therefore, during the two-color mold closing process, the expansion and contraction part remains in the expanded state. When the two-color injection molding is completed, the two-color injection molding machine provides power to make the two-color shovel base detach upward from the first cavity of the slider, and the guiding bevel of the two-color shovel base contacts the elastic guiding part, and because the elastic guiding part is in The expansion and contraction part is in the relaxed state, so in the process of the two-color shovel base detaching upward, the guiding inclined surface of the two-color shovel base squeezes the head of the elastic guide part, and the squeezing force is transmitted to the slider through the side surface of the elastic guide part abutting against the slider, and the squeezing force is the same as the direction of movement of the slider (that is, the direction of rightward movement of the slider). When the squeezing force applied by the two-color shovel base to the elastic guide part is greater than the force of the expansion and contraction part itself from the expansion state to the contraction state, the expansion and contraction part is separated from the positioning groove of the slider, and the expansion and contraction part is switched to the contraction state, and the lateral limiting effect on the slider is lost, so that the slider can move to the right, and then the mold is opened, which can ensure the control of the slider, thereby controlling the tension force in the injection molding process and reducing the shrinkage deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0041] Figure 1 It is a three-dimensional schematic diagram of a core pulling assembly shown in an embodiment of the present application;

[0042] Figure 2 It is a structural schematic diagram of a core pulling assembly shown in an embodiment of the present application;

[0043] Figure 3 is a schematic structural diagram of the expansion and contraction portion shown in an embodiment of the present application;

[0044] Figure 4 It is a schematic diagram of the matching relationship between the two-color shovel base and the elastic guide portion shown in the embodiment of the present application;

[0045] Figure 5 Schematic diagram of the matching relationship between a one-color shovel base and an elastic guide portion shown in an embodiment of the present application;

[0046] Figure 6 This is a schematic diagram of the structure of a single-color mold opening shown in an embodiment of the present application;

[0047] Figure 7 It is a schematic diagram of the structure of the two-color mold opening shown in the embodiment of the present application;

[0048] Figure 8 It is a schematic diagram of the structure of the movable mold assembly shown in the embodiment of the present application. Description of the drawings:

[0050] 1. Slider; 13. Positioning groove;

[0051] 2. elastic guide portion; 21. guide column; 210. arc-shaped guide surface; 22. second elastic component;

[0052] 3. expansion and contraction part; 31. elastic body; 310. bead; 311. first elastic component; 312. annular connecting seat;

[0053] 4. Two-color shovel base;

[0054] 5. One color shovel base;

[0055] 6. Fixed block;

[0056] 7. Slider layer;

[0057] 81. Moving mold assembly. DETAILED DESCRIPTION

[0058] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0059] The existing two-color injection molding is applied to injection molded parts with long strip structures such as wiring harness isolation plates. Since the corresponding structure for realizing mold opening is a rigid structure, the structure will lift the slider during the movement of the slider, causing the slider to move to a certain extent. During the injection molding process, the tension force of the internal structure of the movable mold changes, and the shrinkage deformation of the injection molded part cannot be accurately controlled, resulting in deformation of the wiring harness isolation plate, affecting the sealing reliability of the power battery and causing safety hazards.

[0060] In view of the above problems, an embodiment of the present application provides a core pulling assembly, which controls the movement of the slider 1 through the cooperation between the elastic guide part 2 and the expansion and contraction part 3 to avoid displacement of the slider 1 during the film closing process, thereby reducing the shrinkage deformation of the injection molded part.

[0061] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0062] Example 1

[0063] See also Figures 1 to 7 , a core pulling assembly provided in an embodiment of the present application includes:

[0064] The slider 1 has a first chamber for accommodating the shovel base, a second chamber for accommodating the elastic guide portion 2, and a positioning groove 13 for cooperating with the expansion and contraction portion 3;

[0065] The elastic guide part 2 is obliquely arranged in the slider 1; in the expanded state, the head of the elastic guide part 2 extends into the first cavity; in the compressed state, the head of the elastic guide part 2 is compressed into the second cavity;

[0066] The expansion and contraction portion 3 is disposed at the bottom of the slider 1 and has the function of limiting the expansion state of the slider 1 and releasing the contraction state of the slider 1;

[0067] The two-color shovel base 4 has a guiding inclined surface that cooperates with the elastic guiding part 2.

[0068] The core pulling assembly in the present application includes a slider 1, an elastic guide part 2, an expansion and contraction part 3 and a two-color shovel base 4. During the two-color injection molding process, the one-color shovel base 5 on the one-color fixed mold is inserted into the first cavity of the slider 1 for mold closing. After the one-color injection molding is completed, Figure 5 and Figure 6 As shown, the movable mold assembly moves away from the one-color fixed mold to open the mold. Since the one-color shovel base 5 does not contact the guiding slope of the elastic guide part 2, the elastic guide part 2 does not exert force on the slider 1. During the one-color mold opening and closing process, the expansion and contraction part 3 remains in an expanded state, and the slider 1 is limited during the one-color injection molding process. When two-color injection molding is performed, the movable mold assembly rotates 180° and moves toward the two-color fixed mold, and the two-color shovel base 4 is inserted into the first cavity to close the mold, as shown in FIG. Figure 4 and Figure 7As shown, during this process, the guiding bevel in the two-color shovel base 4 contacts the elastic guiding part 2, so that the force applied by the two-color shovel base 4 during the insertion into the first cavity is absorbed by the elastic guiding part 2, and the head of the elastic guiding part 2 is compressed into the second cavity, so that the elastic guiding part 2 switches from the relaxed state to the compressed state, and the elastic guiding part 2 does not exert force on the slider 1. Therefore, during the two-color mold closing process, the expansion and contraction part 3 remains in the expanded state. When the two-color injection molding is completed, the two-color injection molding machine provides power to make the two-color shovel base 4 detach from the first cavity of the slider 1 upward (away from the moving mold assembly). During this process, the guiding bevel of the two-color shovel base 4 contacts the elastic guiding part 2, and because the elastic guiding part 2 is in the relaxed state, During the upward separation of the two-color shovel base 4, the guiding inclined surface of the two-color shovel base squeezes the head of the elastic guide part 2, and the squeezing force is transmitted to the slider 1 through the side surface of the elastic guide part 2 that abuts against the slider 1. The squeezing force is the same as the direction of movement of the slider 1 (that is, the direction of movement of the slider to the right). When the squeezing force applied by the two-color shovel base 4 to the elastic guide part 2 is greater than the force of the expansion and contraction part 3 itself from the expansion state to the contraction state, the expansion and contraction part 3 is separated from the positioning groove of the slider, and the expansion and contraction part 3 is switched to the contraction state, losing the lateral limiting effect on the slider 1, so that the slider 1 can move to the right, and then the mold is opened, which can ensure the control of the slider 1, thereby controlling the tension force during the injection molding process and reducing the shrinkage deformation.

[0069] It should be specially noted that the one-color fixed mold, one-color shovel base 5, two-color fixed mold, movable mold assembly and two-color shovel base 4 in the present application are applications of the prior art. The two-color shovel base 4 is moved out from the slider 1 under the driving system of the two-color injection molding machine itself, and by squeezing the elastic guide part 2, the force acting on the slider 1 can make the expansion and contraction part 3 change from an expanded state to a contracted state, and then releasing the slider 1 is the innovation of the present application, which effectively solves the problem of shrinkage deformation caused by changes in the tensioning force of the movable mold assembly.

[0070] After completing the above-mentioned mold opening, the movable mold assembly continues to rotate 180°. At this time, the movable mold assembly corresponds to the one-color fixed mold, and the movable mold assembly moves toward the one-color fixed mold. The one-color shovel base 5 is inserted into the first chamber of the slider 1. At this time, the slider 1 moves to the left through the insertion of the one-color shovel base 5. When the position of the positioning groove 13 is relative to the position of the expansion and contraction part 3, the expansion and contraction part 3 can be restored from the contracted state to the expanded state, thereby limiting the slider 1 and realizing the injection molding cycle production.

[0071] The core pulling assembly in the embodiment of the present application realizes the fixation and movement of the slider 1 through the expansion and contraction part 3, does not require too much space for operation, and can effectively control the shrinkage deformation of the injection molded part.

[0072] Example 2

[0073] In order to make the expansion and contraction part 3 described in the embodiment 1 have a more stable limiting and releasing effect, the embodiment of the present application also designs a corresponding structure. On the basis of the above embodiment 1, the elastic body 31 is set to limit or release the slider 1. Figure 2 and Figure 3 The expansion and contraction part 3 in the embodiment of the present application includes an elastic body 31, and the elastic body 31 has a first end and a second end relative to each other. When the first end cooperates with the positioning groove 13, the first end moves away from the second end along the axial direction of the elastic body 31; when the first end is separated from the positioning groove 13, the first end moves toward the second end along the axial direction of the elastic body 31.

[0074] Specifically, the elastic body 31 may undergo compression and tension deformation when subjected to external force. When the component force applied by the elastic guide portion 2 to the slider 1 is greater than the elastic force of the elastic body 31 itself (i.e., the force required for the elastic body 31 to change from an expanded state to a contracted state), the expansion and contraction portion 3 changes from an expanded state to a contracted state and disengages from the positioning groove 13, so that the slider 1 can move on the movable mold assembly.

[0075] In this embodiment, the elastic body 31 includes a ball 310 and a first elastic component 311 . The ball 310 cooperates with the positioning groove 13 , and the first elastic component 311 performs reciprocating motion along its own axial direction.

[0076] Specifically, the bead 310 is a spherical object, which is nested in the positioning groove 13. When the component force of the slider 1 is transmitted to the bead 310, since part of the bead 310 is nested in the positioning groove 13, the force applied to the part of the bead nested in the positioning groove 13 is decomposed into multiple forces relative to the curvature along the curvature of the spherical surface, so that the bead 310 can move toward the first elastic component 311, thereby being disengaged from the positioning groove 13 to achieve the mold opening action.

[0077] The embedding degree of the bead 310 and the positioning groove 13 can be set according to the magnitude of the force transmitted to the bead 310 by the elastic guide part 2. For example, the embedding size in the positioning groove 13 is smaller than the radius of the bead 310. Preferably, the ratio of the embedding size to the radius of the bead 310 is 1:1-2. More preferably, the embedding degree is half of the radius of the bead 310. Under this setting, it can be ensured that the bead 310 has enough space to fix and limit the slider 1. When the bead 310 is nested in the positioning groove 13 and is partially subjected to force, due to the uneven overall force on the bead 310, the part of the bead 310 located in the positioning groove 13 releases pressure to the rest of the part, thereby compressing the first elastic component 311 and causing it to shrink, thereby causing the bead 310 to fall off the positioning groove 13, and can quickly respond to the movement of the elastic guide part 2.

[0078] In another feasible manner, the elastic body 31 can be configured as an elastic arm, both ends of which are fixed on the movable mold assembly, with the middle portion protruding toward a fixed mold (i.e., the elastic guide portion 2). When the expansion and contraction portion 3 is in an expanded state, the protruding portion of the elastic arm is located in the positioning groove 13 and is stuck in the positioning groove 13. When the expansion and contraction portion 3 is in a contracted state, the protruding portion of the elastic arm is compressed, so that the protruding portion is disengaged from the positioning groove 13, thereby realizing the free movement of the slider 1.

[0079] More specifically, a side surface of the elastic arm facing the positioning groove 13 forms a conical guiding structure. Preferably, the elastic arm is a V-shaped spring sheet.

[0080] In this embodiment, the first elastic component 311 is a first spring;

[0081] The expansion and contraction part 3 further includes an annular connection seat 312 , on which the ball 310 and the first spring are sequentially nested, and the annular connection seat 312 is fixedly mounted on the movable mold assembly.

[0082] Specifically, the bead 310 and the first spring are fixed by the annular connecting seat 312 to ensure the stability between the bead 310 and the first spring.

[0083] In this embodiment, the core pulling assembly further includes a slider strip 7;

[0084] Along the movement direction of the slider 1 , the slider pressure strips 7 are arranged on both sides of the slider 1 and are slidably connected to the slider 1 .

[0085] The core pulling assembly in the present application, by providing the ball 310 and the first spring, enables the expansion and contraction part 3 to quickly respond to the force of the elastic guide part 2, thereby quickly completing the fixing and movement of the slider 1, thereby improving production efficiency.

[0086] Example 3

[0087] In practical applications, the two-color shovel base 4 frequently contacts the elastic guide part 2 during the production process. In order to reduce the friction damage of the elastic guide part 2, based on the above embodiments 1 and 2, please refer to Figure 4 and Figure 5 In the embodiment of the present application, the elastic guide portion 2 includes:

[0088] A guide column 21 and a second elastic component 22 , wherein the guide column 21 is connected to the second elastic component 22 , and one end of the second elastic component 22 away from the guide column 21 is inclined toward the bottom of the slider 1 .

[0089] In this embodiment, an arc-shaped guide surface 210 is provided at one end of the guide column 21 away from the second elastic component 22;

[0090] The first elastic component 311 is a second spring.

[0091] Specifically, the movable mold assembly moves toward the fixed mold (i.e., the mold closing direction, which is parallel to the fixed mold and the movable mold assembly), and when the shovel base 5 is inserted into the first chamber of the slider 1, the guide column 21 abuts against the vertical side surface of the shovel base 5. Since the movement direction of the shovel base 5 is parallel to the contact surface of the guide column 21, no force is generated between the shovel base 5 and the guide column 21, so the second elastic component 22 does not deform, thereby keeping the slider 1 immobile. And when the mold is opened, it can also keep the slider 1 immobile.

[0092] During the two-color injection molding process, the movable mold assembly rotates 180° and moves toward the two-color fixed mold. When the two-color shovel base 4 is inserted into the first cavity, the guide column 21 abuts against the arc-shaped side surface of the two-color shovel base 4, thereby driving the guide column 21 to move, thereby causing the second elastic component 22 to contract. At this time, the slider 1 is subjected to a force from the second elastic component 22, and the direction of the force is opposite to the direction of movement of the slider 1. Therefore, the force will be offset by the passive mold assembly, and the slider 1 will not move. When the two-color fixed mold is opened, the slider 1 is subjected to a force from the second elastic part in the same direction as the movement of the slider 1, and when the force is greater than the elastic force of the ball 310 and the first spring, the ball 310 will detach from the positioning groove 13, thereby realizing the movement of the slider 1.

[0093] In this embodiment, the core pulling assembly further includes a fixing block 6, which is located in the second chamber and is detachably connected to the slider 1;

[0094] The two sides of the fixing block 6 have a first side surface and a second side surface opposite to each other, the first side surface and the bottom end surface of the slider 1 are located on the same horizontal plane, and the second side surface intersects with the bottom end surface of the slider 1 and forms an inclined surface;

[0095] The second spring is vertically arranged on the inclined surface.

[0096] In practical applications, the guide column 21 and the second spring are in a long-term working state of extension and contraction and are easily damaged. By providing a detachable connection between the fixing block 6 and the slider 1, it is convenient to maintain the guide column 21 and the second spring.

[0097] Exemplarily, the fixing block 6 and the sliding block 1 may be arranged in a direction of threaded connection.

[0098] In this embodiment, the two-color shovel base 4 has a first side surface and a second side surface opposite to each other, the first side surface is matched with the inner wall of the first chamber, and the second side surface is recessed toward the first side surface and forms the guide slope.

[0099] The core pulling assembly in the present application, by setting the end surface where the elastic guide part 2 abuts against the two-color shovel base 4 as an arc-shaped guide surface 210, can, on the one hand, enable smooth opening and closing of the mold during injection molding, and on the other hand, improve the wear resistance of the elastic guide part 2, thereby improving the stability of the core pulling assembly.

[0100] Example 4

[0101] Based on the above embodiments, the present application also provides a two-color mold, see Figure 8 , specifically including:

[0102] A two-color fixed mold, a movable mold assembly and a plurality of core pulling assemblies as described in any one of Embodiments 1 to 3;

[0103] A plurality of two-color shovel bases 4 of the core-pulling assembly are fixedly mounted on the two-color fixed mold;

[0104] Along the axial direction of the movable mold assembly, a plurality of sliders 1 of the core pulling assembly are arranged on the movable mold assembly.

[0105] Specifically, with the central axis as the axis of symmetry, multiple sliders 1 are arranged side by side on both sides of the central axis, and the movable mold assembly is provided, which can stabilize the tension of the movable mold assembly during the injection molding process. At the same time, the slight displacement of individual sliders 1 does not affect the stability of other sliders 1, and can effectively control the shrinkage deformation to ensure that the deformation of the injection molded part can be less than 5mm. The movement process of the slider is specifically as follows: when the two-color fixed mold is opened, the sliders located on both sides of the central axis move toward the central axis along the width direction of the movable mold assembly.

[0106] Exemplarily, there are 8 groups of sliders 1 arranged on the movable mold assembly. More preferably, 4 groups of the sliders 1 are symmetrically arranged on both sides of the central axis of the movable mold assembly.

[0107] The specific working principle of the two-color mold in this embodiment has been described in embodiments 1 to 3 and will not be described in detail here.

[0108] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A core pulling assembly, characterized in that: include: The slider has a first chamber for accommodating the shovel base, a second chamber for accommodating the elastic guide portion, and a positioning groove for cooperating with the expansion and contraction portion; An elastic guide portion is obliquely arranged in the slider; in a relaxed state, the head of the elastic guide portion extends into the first chamber; in a compressed state, the head of the elastic guide portion is compressed into the second chamber; An expansion and contraction portion, disposed at the bottom of the slider, having the function of limiting the expansion state of the slider and releasing the contraction state of the slider; The two-color shovel base has a guiding inclined surface matched with the elastic guiding part.

2. The core pulling assembly according to claim 1, characterized in that: The expansion and contraction portion includes an elastomer having a first end and a second end relative to each other. When the first end cooperates with the positioning groove, the first end moves away from the second end along the axial direction of the elastomer; when the first end disengages from the positioning groove, the first end moves toward the second end along the axial direction of the elastomer.

3. The core pulling assembly according to claim 2, characterized in that: The elastic body includes a ball and a first elastic component. The ball matches with the positioning groove, and the first elastic component reciprocates along its own axial direction.

4. The core pulling assembly according to claim 3, characterized in that: The first elastic component is a first spring; The expansion and contraction part also includes an annular connecting seat, the shifting ball and the first spring are sequentially nested on the annular connecting seat, and the annular connecting seat is fixed on the movable mold assembly.

5. The core pulling assembly according to claim 1, characterized in that: The elastic guide portion comprises: A guide post and a second elastic component, wherein the guide post is connected to the second elastic component, and an end of the second elastic component away from the guide post is inclined toward the bottom of the sliding block.

6. The core pulling assembly according to claim 5, characterized in that: An arc-shaped guide surface is provided at one end of the guide column away from the second elastic component; The second elastic component is a second spring.

7. The core pulling assembly according to claim 6, characterized in that: The core pulling assembly further includes a fixed block, which is located in the second chamber and is detachably connected to the slider; The two sides of the fixed block have a first side surface and a second side surface opposite to each other, the first side surface and the bottom end surface of the slider are located on the same horizontal plane, and the second side surface intersects with the bottom end surface of the slider and forms an inclined surface; The second spring is vertically arranged on the inclined surface.

8. The core pulling assembly according to claim 1, characterized in that: The core pulling assembly also includes a slider strip; Along the moving direction of the slider, the slider pressure strips are arranged on both sides of the slider and are slidably connected with the slider.

9. The core pulling assembly according to claim 1, characterized in that: The two-color shovel base has a first side surface and a second side surface opposite to each other. The first side surface of the two-color shovel base fits with the inner wall of the first chamber, and the second side surface of the two-color shovel base is recessed toward the first side surface to form the guide slope.

10. A two-color mold, characterized in that: include: Two-color fixed mold, movable mold assembly and a plurality of core pulling assemblies according to any one of claims 1 to 9; The two-color shovel bases of the plurality of core-pulling assemblies are fixedly arranged on the two-color fixed mold; Along the axial direction of the movable mold assembly, a plurality of sliders of the core pulling assembly are arranged on the movable mold assembly.

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