Injection mold self-locking mechanism for large-area thin-wall part composite insert

Abstract

According to the injection mold self-locking mechanism for the large-area thin-wall part composite insert, an insert fixing insert pin comprises an insert pin body and a sleeve assembly, and the insert pin body comprises an insert mounting part; the sleeve assembly comprises a deformable end, the driving structure comprises a J-shaped guide column and a sliding block, the insert tightness control structure comprises a driving taper needle, and the deformable end deforms outwards during mold closing, so that the acting force of the deformable end and an insert is increased, further, the jumping of the insert under high pressure during injection molding is reduced, the quality of an injection molding product is improved, and the reject ratio is reduced; when the mold is opened, the deformable end is reset inwards, so that the acting force between the deformable end and the insert is reduced, a product subjected to injection molding is easy to demold, and the success rate is improved when a new insert is placed in the insert mounting part; moreover, due to the arrangement of the deformable end, the fit clearance between the insert mounting part and the insert can be designed to be larger, so that the insert can be placed manually or by a manipulator during mold opening, and the success rate of placing the insert is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a self-locking mechanism of an injection mold for composite inserts of large-area thin-walled parts. Background Art

[0002] When producing injection molded products with inserts, especially large-area thin-walled composite insert injection molded products, it is usually necessary to set the insert in the cavity of the injection mold in advance, and then press the molten injection molding material into the cavity, so that the insert can be fixed in the specified position of the plastic product while molding the plastic product.

[0003] In actual production, inserts are grabbed manually or by a robot, and placed on the insert fixing pins in the cavity of the injection mold. Since the molten injection molding material is pressed into the cavity with a high pressure, the insert is easy to jump on the insert fixing pins, resulting in the insert failing to be compounded at the designated position of the large-area thin-walled injection molding product, thereby affecting the quality and defective rate of the injection molding product. In order to reduce the jumping, the technicians design the fitting clearance between the insert and the insert fixing pin to be smaller, so as to increase the friction between the insert and the insert fixing pin, thereby improving the jumping of the insert. However, the larger friction will lead to a lower success rate of placing the insert on the insert fixing pin, which will also affect the quality and defective rate of the large-area thin-walled injection molding product. Summary of the invention

[0004] The problem to be solved by the present invention is to provide an injection mold self-locking mechanism for large-area thin-wall composite inserts, which can reduce the movement of inserts and facilitate the placement of inserts during the production of injection molded products, and an injection mold with the above-mentioned self-locking mechanism.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a self-locking mechanism of an injection mold for a large-area thin-wall composite insert, comprising an insert fixing pin, a driving structure arranged on one side of the insert fixing pin, and an insert looseness control structure arranged on one end of the insert fixing pin and driven by the driving structure;

[0006] The insert fixing needle comprises an insert body and a sleeve assembly disposed in the insert body; the insert body comprises an insert mounting portion disposed at one end and used to place the insert, and the sleeve assembly comprises a deformable end matched with the insert mounting portion;

[0007] The driving structure includes a J-shaped guide column and a slider; the J-shaped guide column and the slider move up and down relative to each other as the mold is opened or closed, and the slider is driven by the J-shaped guide column to move left and right; the insert tightness control structure includes a driving taper needle that is driven by the left and right movement of the slider to move up and down in the sleeve assembly;

[0008] During injection molding, the driving tapered needle moves upward and the deformable end deforms outward to increase the force acting on the insert; when placing the insert, the driving tapered needle moves downward and the deformable end resets inward to reduce the force acting on the insert.

[0009] Compared with the prior art, the insert fixing pin of the present invention comprises a pin body and a sleeve assembly, the pin body comprises an insert mounting portion so as to place the insert and set the insert in the mold cavity; the sleeve assembly comprises a deformable end, the driving structure comprises a J-shaped guide column and a slider, the insert tightness control structure comprises a driving taper needle, when the mold is closed, the J-shaped guide column drives the slider and the driving taper needle to move, thereby driving the deformable end to deform outward, so that the acting force between the deformable end and the insert is increased, thereby reducing the jump of the insert under the high pressure during injection molding, thereby improving the injection molding yield. The J-shaped guide column drives the slider and the taper needle to move when the mold is opened, thereby driving the deformable end to reset inward, so that the force between the deformable end and the insert is reduced, so that the molded product is easy to demold and the success rate of placing a new insert in the insert installation part is increased, thereby further improving the quality of the injection molded product and reducing the defective rate; and, due to the setting of the deformable end, the matching clearance between the insert installation part and the insert can be designed to be larger, so that the insert can be placed manually or by a robot when the mold is opened, further improving the success rate of insert placement.

[0010] The present invention provides a self-locking mechanism for an injection mold for a large-area thin-walled composite insert, wherein the deformable end includes at least one deformable sheet, and the insert mounting portion includes at least one empty groove that cooperates with the deformable sheet; the driving taper needle includes a needle rod and a needle head arranged at the end of the needle rod; when the needle head cooperates with the deformable sheet, the deformable sheet is hidden in the insert mounting portion through the empty groove; when the needle rod cooperates with the deformable sheet, the deformable sheet protrudes out of the insert mounting portion through the empty groove.

[0011] The present invention provides an injection mold self-locking mechanism for large-area thin-wall composite inserts, wherein the deformable sheet is provided with a plurality of locking parts on one side facing the empty slot; the locking parts are used to increase the acting force between the deformable end and the insert.

[0012] The present invention provides a self-locking mechanism for an injection mold for large-area thin-walled composite inserts, wherein the insert body has a first hole segment, a second hole segment and a third hole segment inside; the sleeve assembly includes a sleeve body and at least one connecting strip nested by the sleeve body; the connecting strip includes a limit block and a transition strip; the limit block cooperates with the first hole segment; the sleeve body cooperates with the second hole segment; the transition strip passes through the sleeve body and cooperates with the third hole segment; the deformable end is arranged at the end of the transition strip.

[0013] The present invention provides a self-locking mechanism for an injection mold for composite inserts of large-area thin-walled parts, wherein the sleeve body has an intermediate channel arranged inside, at least one first embedding groove arranged below the side wall, and at least one second embedding groove arranged above the side wall; the intermediate channel is used for the movement of the needle bar; the first embedding groove cooperates with the limit block; and the second embedding groove cooperates with the transition strip.

[0014] The present invention discloses a self-locking mechanism for an injection mold for a large-area thin-wall composite insert, wherein the J-shaped guide column comprises a compensation block, a connecting block arranged at one end of the compensation block, and an inclined guide column arranged at the other end of the compensation block; the sliding block has an inclined hole that cooperates with the inclined guide column.

[0015] The present invention discloses a self-locking mechanism for an injection mold for large-area thin-walled composite inserts, wherein the driving structure comprises a slider cover plate arranged at one end of the slider and a limit bump block arranged at one side of the slider; the slider cover plate is used to limit the up and down movement of the slider; the limit bump block is used to limit the left and right movement of the slider; the slider cover plate has a first avoidance groove for avoiding the inclined guide column.

[0016] The present invention discloses an injection mold self-locking mechanism for large-area thin-wall composite inserts, wherein the driving structure comprises a driving bevel block arranged at one end of the slider; and the end of the driving bevel block pointing to the insert tightness control structure has a first bevel surface.

[0017] The present invention discloses a self-locking mechanism for an injection mold of a large-area thin-wall composite insert, wherein the insert tightness control structure comprises a base block, a movable block arranged on the base block, a lining plate arranged in the movable block, and an elastic member arranged between the base block and the lining plate; the lower end of the driving taper needle is arranged in the movable block and fixed by the lining plate; the movable block has a second bevel surface that matches the first bevel surface; the left and right movement of the driving bevel block is converted into the up and down movement of the driving taper needle via the movable block and the elastic member.

[0018] The invention discloses an injection mold self-locking mechanism for large-area thin-wall composite inserts, wherein the end of the driving bevel block has a second avoidance groove; the second avoidance groove avoids the driving taper needle when the driving bevel block moves left and right. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 It is an explosion schematic diagram of the present invention;

[0021] Figure 3 It is a cross-sectional schematic diagram of the present invention;

[0022] Figure 4 It is an enlarged schematic diagram of the internal structure of the needle body;

[0023] Figure 5 It is a schematic diagram of the cooperation between the insert mounting portion and the deformable end;

[0024] Figure 6 It is a three-dimensional schematic diagram of the needle body and the sleeve assembly;

[0025] Figure 7 An exploded schematic diagram of the cooperation between the sleeve body, the connecting strip and the driving taper needle;

[0026] Figure 8 It is an exploded schematic diagram of the insert tightness control structure;

[0027] Fig. 9 It is a schematic diagram of the state of the present invention when the mold is opened;

[0028] Fig.10 It is a schematic diagram of the state of the present invention when the mold is closed. DETAILED DESCRIPTION

[0029] Before describing in detail any embodiment of the present invention, it should be understood that the present invention is not limited in its application to the construction and arrangement details of the components described below or illustrated in the following figures. The present invention can have other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used here are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and its variations herein is intended to cover the items and their equivalents and additional items displayed below. Unless otherwise specified or limited, the terms "install", "connect", "support" and "couple" and their variations are widely used and cover direct installation and indirect installation, connection, support and connection. In addition, "connect" and "couple" are not limited to physical or mechanical connections or connections.

[0030] Furthermore, on the first aspect, in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second aspect, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0031] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

[0032] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0033] See also Figure 1-9 The self-locking mechanism of an injection mold for a large-area thin-wall composite insert shown in the figure comprises an insert fixing pin 1, a driving structure 2 arranged at one side of the insert fixing pin 1, and an insert tightness control structure 3 arranged at one end of the insert fixing pin 1 and driven by the driving structure 2;

[0034] The insert fixing needle 1 comprises an insert body 11 and a sleeve assembly 12 disposed in the insert body 11; the insert body 11 comprises an insert mounting portion 111 disposed at one end and used to place the insert, and the sleeve assembly 12 comprises a deformable end 121 matched with the insert mounting portion 111;

[0035] The driving structure 2 includes a J-shaped guide post 21 and a slider 22; the J-shaped guide post 21 and the slider 22 move up and down relative to each other as the mold is opened or closed, and the slider 22 is driven by the J-shaped guide post 21 to move left and right; the insert tension control structure 3 includes a driving taper needle 31 that moves up and down in the sleeve assembly 12 due to the left and right movement of the slider 22;

[0036] During injection molding, the tapered needle 31 is driven to move upward and the deformable end 121 is deformed outward to increase the force acting on the insert; when placing the insert, the tapered needle 31 is driven to move downward and the deformable end 121 is reset inward to reduce the force acting on the insert.

[0037] In actual use, the insert fixing pin 1 of the present invention includes a pin body 11 and a sleeve assembly 12. The pin body 11 includes an insert mounting portion 111 for placing the insert and setting the insert in the mold cavity; the sleeve assembly 12 includes a deformable end 121, the driving structure 2 includes a J-shaped guide column 21 and a slider 22, and the insert tightness control structure 3 includes a driving taper needle 31. When the mold is closed, the J-shaped guide column 21 drives the slider 22 and the driving taper needle 31 to move, thereby driving the deformable end 121 to deform outward, so that the force between the deformable end 121 and the insert is increased, thereby reducing the jump of the insert under the high pressure during injection molding, thereby The quality of the injection molded products is improved and the defective rate is reduced. When the mold is opened, the J-shaped guide column 21 drives the slider 22 and drives the tapered needle 31 to move, thereby driving the deformable end 121 to reset inward, so that the force between the deformable end 121 and the insert is reduced, so that the injection molded product is easy to demold and the success rate of placing a new insert on the insert mounting portion 111 is increased, thereby further improving the quality of the injection molded products and reducing the defective rate. In addition, due to the setting of the deformable end 121, the matching clearance between the insert mounting portion 111 and the insert can be designed to be larger, so that the insert can be placed manually or by a robot when the mold is opened, further improving the success rate of insert placement.

[0038] Please continue reading Figure 3 , Figure 5 , Figure 6 , wherein the deformable end 121 includes at least one deformable sheet 1211, and the insert mounting portion 111 includes at least one empty slot 1111 cooperating with the deformable sheet 1211; the driving tapered needle 31 includes a needle rod 311 and a needle head 312 arranged at the end of the needle rod 311; when the needle head 312 cooperates with the deformable sheet 1211, the deformable sheet 1211 is hidden in the insert mounting portion 111 through the empty slot 1111; when the needle rod 311 cooperates with the deformable sheet 1211, the deformable sheet 1211 protrudes out of the insert mounting portion 111 through the empty slot 1111.

[0039] Specifically, the size of the needle head 312 is smaller than the needle rod 311, and the influence on the deformable sheet 1211 gradually increases in the process of driving the tapered needle 31 to move upward; the deformable sheet 1211 itself is elastic, and under the action of the needle head 312 or the needle rod 311, it will gradually deform along the empty groove 1111, until the needle rod 311 is in full contact with the deformable sheet 1211, the deformation degree of the deformable sheet 1211 reaches the maximum, and the force of the deformable sheet 1211 on the insert also reaches the maximum. At this time, the entire injection mold is in a closed mold state, and the molten injection molding material is pressed into the mold cavity to prevent the insert from jumping under the huge injection pressure.

[0040] Furthermore, with respect to the present embodiment, the number of the deformable sheets 1211 is four and they are evenly distributed along the circumference of the driving tapered needle 31, and the number of the empty slots 1111 cooperating with the deformable sheets 1211 is also four, and the position distribution corresponds to the four deformable sheets 1211 respectively; under this arrangement, with respect to the insert, the four deformable sheets 1211 evenly act on the inner wall of the insert, so that the deformable sheets 1211 have a stronger ability to lock the insert, and the force acting on the insert is more even and balanced, which can avoid the problem of the insert shifting to one side under huge injection pressure; with respect to the driving tapered needle 31, the design of the four deformable sheets 1211 evenly distributed along the circumference can avoid the reaction force of the deformable sheets 1211 on the outer wall of the needle rod 311 under huge injection pressure, which causes the needle rod 311 itself or the assembly of the entire insert tightness control structure 3 to deform and loosen, thereby extending the service life of the needle rod 311 itself or the entire insert tightness control structure 3.

[0041] It is worth mentioning that when the mold is in the fully closed position, the critical point of the needle 312 and the needle rod 311 contacts the deformable sheet 1211, and the positions of the two correspond. Since the needle 312 is a tapered structure with a gradually changing diameter, and the diameter of the needle rod 311 is constant, the deformable sheet 1211 gradually changes under the drive of the needle 312. When the needle rod 311 contacts the deformable sheet 1211, the deformation degree of the deformable sheet 1211 is the largest, and the needle rod 311 continues to move and cannot make the deformable sheet 1211 deform. 1 continues to change, so under this position setting, the stroke of the needle head 312 and the needle rod 311 is the shortest, which is beneficial to reducing the length of the driving tapered needle 31 and improving the stability of the entire insert anti-jumping mechanism; and when the mold is opened, the driving tapered needle 31 is immediately squeezed, and the needle head 312 immediately moves toward the deformable sheet 1211, so that the deformation of the deformable sheet 1211 is immediately reduced, thereby immediately reducing the force on the inside of the insert 6, preventing the inner wall of the insert 6 from being damaged when the insert mounting portion 111 is withdrawn.

[0042] Please continue reading Figure 5 , wherein a plurality of locking portions 12111 are provided on one side of the deformable sheet 1211 facing the empty slot 1111; the locking portions 12111 are used to increase the acting force between the deformable end 121 and the insert.

[0043] In this embodiment, the locking portion 12111 is configured as a plurality of serration structures, and are arranged sequentially from top to bottom on the side of the deformable sheet 1211 facing the slot 1111; the inner wall of the insert is generally provided with a threaded structure to form a threaded hole. When the deformable sheet 1211 and the inner wall of the insert are aligned, the serration structure can extend into the threaded structure of the inner wall of the insert, thereby forming a firm locking structure, which greatly enhances the acting force between the two and effectively reduces the axial movement of the insert.

[0044] It is understandable that the locking portion 12111 may also be configured as other shapes, such as a threaded shape that matches the threaded structure of the inner wall of the insert, or a protruding structure that increases friction.

[0045] Please continue reading Figure 4 , Figure 6 , wherein the interior of the insert body 11 has a first hole section 112, a second hole section 113 and a third hole section 114; the sleeve assembly 12 includes a sleeve body 122 and at least one connecting strip 123 nested in the sleeve body 122; the connecting strip 123 includes a limit block 1231 and a transition strip 1232; the limit block 1231 cooperates with the first hole section 112; the sleeve body 122 cooperates with the second hole section 113; the transition strip 1232 passes through the sleeve body 122 and cooperates with the third hole section 114; the deformable end 121 is arranged at the end of the transition strip 1232.

[0046] Specifically, the driving tapered needle 31 needs to move up and down in the insert fixing needle 1 to drive the tightness of the deformable sheet 1211. Therefore, it is necessary to ensure that the deformable sheet 1211 is not carried along with the up and down movement of the driving tapered needle 31. In this embodiment, the lower end surfaces of the insert needle body 11, the sleeve body 122 and the connecting strip 123 are arranged on the same plane, and the plane is supported by other structures of the injection mold, so that when the driving tapered needle 31 moves downward, the insert needle body 11, the sleeve body 122 and the connecting strip 123 will not be carried downward. When the tapered needle 31 moves upward, since the sleeve body 122 is limited by the upper end of the second hole segment 113, the sleeve body 122 will not be driven to move upward by the tapered needle 31, and the limit block 1231 is limited by the first hole segment 112, so the first hole segment 112 will not be driven to move upward by the tapered needle 31; since the limit block 1231 and the transition bar 1232 are limited during the up and down movement of the tapered needle 31 and will not move up and down therewith, the deformable end 121 arranged at the end of the transition bar 1232 can stably complete the loose and tight fitting action with the insert.

[0047] Please continue reading Figure 6 , Figure 7 , wherein the sleeve body 122 has an intermediate channel 1221 arranged inside, at least one first embedding groove 1222 arranged below the side wall, and at least one second embedding groove 1223 arranged above the side wall; the intermediate channel 1221 is used for the movement of the needle rod 311; the first embedding groove 1222 cooperates with the limit block 1231; the second embedding groove 1223 cooperates with the transition strip 1232.

[0048] Specifically, during the up and down movement of the driving tapered needle 31, it is necessary not only to ensure that the deformable end 121 does not move axially therewith, but also to ensure that the deformable end 121 does not rotate. If the deformable end 121 rotates during the repeated movement of the driving tapered needle 31, after the rotation amount accumulates to a certain extent, the deformable sheet 1211 and the empty groove 1111 may be misaligned, resulting in failure of the deformable sheet 1211; therefore, the outer wall of the sleeve body 122 is configured to have an interference fit with the second hole section 113, so that the sleeve body 122 does not rotate during the repeated movement of the driving tapered needle 31. On this basis, the first embedding groove 1222 is limited by the limit block 1231, and the second embedding groove 1223 is limited by the transition strip 1232, so that both of them cannot rotate. Finally, the deformable end 121 arranged at the end of the transition strip 1232 does not rotate during the repeated movement of the driving tapered needle 31, so that the loose and tight fit with the insert can be stably completed.

[0049] It can be understood that the aforementioned deformable ends 121 are set as four, which is a preferred embodiment. According to this embodiment, the connecting strip 123, the first embedding groove 1222 and the second embedding groove 1223 are all set as four to match the four deformable ends 121.

[0050] Please continue reading Figure 3 , wherein the J-shaped guide column 21 includes a compensation block 211, a connecting block 212 arranged at one end of the compensation block 211 and an inclined guide column 213 arranged at the other end of the compensation block 211; the slider 22 has an inclined hole 221 that cooperates with the inclined guide column 213.

[0051] It can be understood that the connecting block 212 is connected to the upper mold or the lower mold of the injection mold so as to follow the movement of the upper mold or the lower mold; the compensation block 211 is arranged between the connecting block 212 and the inclined guide column 213 and biased to one side so as to provide a basis for the inclined setting of the inclined guide column 213; only with the cooperation of the inclined guide column 213 and the inclined hole 221, the movement of the J-shaped guide column 21 can be converted into the left and right movement of the slider 22.

[0052] Please continue to refer to the figure Figure 3 , wherein the driving structure 2 includes a slider cover plate 23 arranged at one end of the slider 22 and a limiting bumper 24 arranged at one side of the slider 22; the slider cover plate 23 is used to limit the up and down movement of the slider 22; the limiting bumper 24 is used to limit the left and right movement of the slider 22; the slider cover plate 23 has a first avoidance groove 231 for avoiding the inclined guide column 213.

[0053] Specifically, the slider cover 23 is connected to the injection mold. During the up and down movement of the J-shaped guide column 21, the slider cover 23 is fixed so as to limit the slider 22 so that the slider 22 will not be moved up and down by the J-shaped guide column 21; the first avoidance groove 231 of the slider cover 23 is used to provide space for the up and down movement of the J-shaped guide column 21; the limit collision block 24 is connected to the injection mold. During the left and right movement of the slider 22, the limit collision block 24 is used to limit the maximum movement stroke of the slider 22.

[0054] Please continue reading Figure 3 , wherein the driving structure 2 includes a driving bevel block 25 arranged at one end of the slider 22; the driving bevel block 25 has a first bevel surface 251 at one end pointing to the insert tightness control structure 3.

[0055] Specifically, the arrangement of the driving bevel block 25 is conducive to increasing the control distance of the driving structure 2 so as to adjust the distance according to the overall layout of the injection mold, so that the present invention can stabilize the delivery effect without interfering with other mechanisms in the injection mold.

[0056] Please continue reading Figure 3 , Figure 7 The insert tightness control structure 3 includes a base block 32, a movable block 33 arranged on the base block 32, a lining plate 34 arranged in the movable block 33, and an elastic member 35 arranged between the base block 32 and the lining plate 34; the lower end of the driving taper needle 31 is arranged in the movable block 33 and fixed by the lining plate 34; the movable block 33 has a second bevel surface 331 that matches the first bevel surface 251; the left and right movement of the driving bevel block 25 is converted into the up and down movement of the driving taper needle 31 through the movable block 33 and the elastic member 35.

[0057] Specifically, the base block 32 is fixed on the injection mold, and the movable block 33 is located on the base block 32 and can move up and down under the action of the elastic member 35; when the driving bevel block 25 moves to the left, the first bevel surface 251 and the second bevel surface 331 interact with each other to compress the elastic member 35 and make the movable block 33 move downward. At this time, the driving taper needle 31 also moves downward under the fixation of the movable block 33 and the lining plate 34, and the deformable sheet 1211 is hidden in the insert mounting portion 111, and the insert is easily placed in the insert mounting portion 111; when the driving bevel block 25 moves to the right, the first bevel surface 251 and the second bevel surface 331 are disengaged from each other to make the elastic member 35 stretch and make the movable block 33 move upward. At this time, the driving taper needle 31 also moves upward under the fixation of the movable block 33 and the lining plate 34, and the deformable sheet 1211 protrudes from the insert mounting portion 111 and locks the insert, so that the insert is not easy to jump during injection molding.

[0058] Please continue reading Figure 3The end of the driving bevel block 25 has a second avoidance groove 252; the second avoidance groove 252 avoids the driving taper needle 31 when the driving bevel block 25 moves left and right.

[0059] It can be understood that since the lower end of the driving taper needle 31 is arranged in the movable block 33 and the upper end extends from the movable block 33, the setting of the second avoidance groove 252 ensures that during the cooperation between the first bevel surface 251 and the second bevel surface 331, the driving bevel block 25 will not interfere with the driving taper needle 31, thereby enabling the driving taper needle 31 to stably drive the movement of the deformable sheet 1211.

[0060] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A self-locking mechanism for injection molds used for large-area thin-wall composite inserts, characterized in that: It comprises an insert fixing pin (1), a driving structure (2) arranged on one side of the insert fixing pin (1), and an insert tightness control structure (3) arranged on one end of the insert fixing pin (1) and driven by the driving structure (2); The insert fixing needle (1) comprises a needle body (11) and a sleeve assembly (12) arranged in the needle body (11); the needle body (11) comprises an insert mounting portion (111) arranged at one end and used to place the insert, and the sleeve assembly (12) comprises a deformable end (121) matched with the insert mounting portion (111); The driving structure (2) comprises a J-shaped guide column (21) and a slider (22); the J-shaped guide column (21) and the slider (22) move up and down relative to each other as the mold is opened or closed, and the slider (22) is driven by the J-shaped guide column (21) to move left and right; the insert tightness control structure (3) comprises a driving taper needle (31) that is driven by the left and right movement of the slider (22) to move up and down in the sleeve assembly (12); During injection molding, the driving tapered needle (31) moves upward and the deformable end (121) deforms outward to increase the force acting on the insert; when the insert is placed, the driving tapered needle (31) moves downward and the deformable end (121) returns inward to reduce the force acting on the insert.

2. The self-locking mechanism of the injection mold for large-area thin-wall composite inserts according to claim 1 is characterized in that: The deformable end (121) includes at least one deformable piece (1211), and the insert mounting portion (111) includes at least one empty slot (1111) that cooperates with the deformable piece (1211); the driving taper needle (31) includes a needle rod (311) and a needle head (312) arranged at the end of the needle rod (311); when the needle head (312) cooperates with the deformable piece (1211), the deformable piece (1211) is hidden in the insert mounting portion (111) through the empty slot (1111); when the needle rod (311) cooperates with the deformable piece (1211), the deformable piece (1211) protrudes out of the insert mounting portion (111) through the empty slot (1111).

3. The self-locking mechanism of the injection mold for large-area thin-wall composite inserts according to claim 2, characterized in that: A plurality of locking portions (12111) are provided on one side of the deformable sheet (1211) facing the empty slot (1111); the locking portions (12111) are used to increase the acting force between the deformable end (121) and the insert.

4. The self-locking mechanism of the injection mold for large-area thin-wall composite inserts according to claim 2, characterized in that: The insert needle body (11) has a first hole section (112), a second hole section (113) and a third hole section (114) inside; the sleeve assembly (12) includes a sleeve body (122) and at least one connecting strip (123) nested by the sleeve body (122); the connecting strip (123) includes a limit block (1231) and a transition strip (1232); the limit block (1231) cooperates with the first hole section (112); the sleeve body (122) cooperates with the second hole section (113); the transition strip (1232) passes through the sleeve body (122) and cooperates with the third hole section (114); the deformable end (121) is arranged at the end of the transition strip (1232).

5. The self-locking mechanism of the injection mold for large-area thin-wall composite inserts according to claim 4, characterized in that: The sleeve body (122) has an intermediate channel (1221) arranged inside, at least one first embedding groove (1222) arranged below the side wall, and at least one second embedding groove (1223) arranged above the side wall; the intermediate channel (1221) is used for the movement of the needle rod (311); the first embedding groove (1222) cooperates with the limit block (1231); the second embedding groove (1223) cooperates with the transition strip (1232).

6. The self-locking mechanism of the injection mold for large-area thin-wall composite inserts according to claim 1, characterized in that: The J-shaped guide column (21) comprises a compensation block (211), a connection block (212) arranged at one end of the compensation block (211), and an inclined guide column (213) arranged at the other end of the compensation block (211); the sliding block (22) has an inclined hole (221) matched with the inclined guide column (213).

7. The self-locking mechanism of the injection mold for large-area thin-wall composite inserts according to claim 6, characterized in that: The driving structure (2) comprises a slider cover plate (23) arranged at one end of the slider (22) and a limiting bumper (24) arranged at one side of the slider (22); the slider cover plate (23) is used to limit the up and down movement of the slider (22); the limiting bumper (24) is used to limit the left and right movement of the slider (22); the slider cover plate (23) has a first avoidance groove (231) for avoiding the inclined guide column (213).

8. The self-locking mechanism of the injection mold for large-area thin-wall composite inserts according to claim 1, characterized in that: The driving structure (2) comprises a driving bevel block (25) arranged at one end of the sliding block (22); the end of the driving bevel block (25) pointing to the insert tightness control structure (3) has a first bevel surface (251).

9. The self-locking mechanism of the injection mold for large-area thin-wall composite inserts according to claim 8, characterized in that: The insert tightness control structure (3) comprises a base block (32), a movable block (33) arranged on the base block (32), a lining plate (34) arranged in the movable block (33), and an elastic member (35) arranged between the base block (32) and the lining plate (34); the lower end of the driving taper needle (31) is arranged in the movable block (33) and is fixed by the lining plate (34); the movable block (33) has a second bevel surface (331) matched with the first bevel surface (251); the left and right movement of the driving bevel block (25) is converted into the up and down movement of the driving taper needle (31) through the movable block (33) and the elastic member (35).

10. The self-locking mechanism of the injection mold for large-area thin-wall composite inserts according to claim 8, characterized in that: The end of the driving bevel block (25) is provided with a second avoidance groove (252); the second avoidance groove (252) avoids the driving taper needle (31) when the driving bevel block (25) moves left and right.

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