Injection mold for embedding brushless motor

Abstract

The injection mold comprises an upper mold base and a lower mold base which are oppositely arranged, positioning sleeves are arranged at the corners of the lower end face of the upper mold base, inserting blocks are symmetrically arranged on the inner sides of the positioning sleeves, buffer cavities for the positioning sleeves to be inserted are formed in the corners of the upper end face of the lower mold base, and first springs are arranged in the buffer cavities. The positioning sleeves are arranged at the corners of the lower end face of the upper die base, the buffering cavities are symmetrically formed in the upper end face of the lower die base, the first springs are used for buffering pressure during die assembly, the inserting grooves corresponding to the inserting blocks are symmetrically formed in the buffering cavities, and during die opening, the positioning sleeves cannot be separated from the buffering cavities. The spring is arranged in the buffer cavity, during mold closing, the pressure during mold closing is buffered by compressing the spring, the service life of the mold is prolonged, the insertion block is arranged on the inner side of the positioning sleeve, the insertion groove corresponding to the insertion block is formed in the buffer cavity, when the positioning sleeve is inserted into the buffer cavity, the insertion block is also inserted into the insertion groove, and the mold closing precision is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, in particular to an injection mold for embedding a brushless motor. Background Art

[0002] Embedded injection molding of brushless motors is a manufacturing process that embeds some metal or non-metal components of the motor into the injection mold, and then injects molten plastic to make it tightly bonded with the insert, so that complex parts can be molded in one operation, improving production efficiency and enhancing the structural stability of the finished product. This method is often used to make motor housings or other structural parts that require high-strength bonding, which helps reduce subsequent assembly steps while improving the overall quality and durability of the product.

[0003] The Chinese patent document "CN105751438A, a partially replaceable injection mold" has four guide sleeves on the movable mold plate around the mold frame, and four guide posts on the fixed mold plate around the concave mold. The positions of the guide sleeves and the guide posts are aligned with each other, and the guide posts can be embedded in the guide sleeves. When the mold is installed, the guide sleeve cooperates with the guide posts on the fixed mold to play a role in positioning and guiding, which facilitates the installation and positioning of the injection mold.

[0004] However, during the production process, if an operating error occurs when the injection mold is closing or opening the mold, it will cause a collision between the upper and lower molds, thereby shortening the service life of the injection mold. Utility Model Content

[0005] The utility model aims to provide an injection mold for embedding a brushless motor to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A brushless motor embedding injection mold comprises an upper mold base and a lower mold base which are arranged relatively to each other, wherein a positioning sleeve is provided at a corner position of the lower end surface of the upper mold base, and an insert block is symmetrically provided on the inner side of the positioning sleeve, and a buffer cavity for inserting the positioning sleeve is provided at the corner position of the upper end surface of the lower mold base, and a spring (23) is provided in the buffer cavity to buffer the pressure during mold closing, and slots corresponding to the insert blocks are symmetrically provided on the buffer cavity. After mold opening, the positioning sleeve is kept in the buffer cavity and will not fall out of the buffer cavity.

[0008] Furthermore, the height of the positioning sleeve is smaller than the height of the buffer cavity.

[0009] Furthermore, the upper mold base includes an upper fixed plate, a hot runner plate and an upper mold plate arranged from top to bottom, the upper fixed plate is provided with a pouring port, the hot runner plate is provided with a cavity connected to the pouring port, and the upper mold plate is provided with two runners connected to the cavity.

[0010] Further, a lower fixing plate is provided on the lower die base, an ejection mechanism is provided on the lower fixing plate, supporting square irons are provided on both sides of the ejection mechanism, a lower template is provided on the supporting square irons, a lower die core is provided in the lower template, and injection molding stations corresponding to two runners are provided on the lower die core.

[0011] Further, an installation station for installing product parts is provided on the outer edge of the injection molding station. The injection molding station includes injection molding runners arranged in a circular array. Inserts are provided at the ends of several injection molding runners. Through holes for communicating the injection molding runners with the installation station are provided on the inserts. The product parts are in close fit with the through holes to block the through holes and prevent the injection liquid from flowing out.

[0012] Further, the through holes are arranged obliquely downward to facilitate the ejection mechanism to eject the injection molded parts.

[0013] Further, the ejection mechanism includes a push plate. An installation plate for installing ejector pin 1 and ejector pin 2 is provided on the push plate. A number of guide posts are inserted through the installation plate. One end of the guide posts is connected to the lower fixing plate, and the other end is connected to the lower template.

[0014] Further, the ejector pins 1 are arranged in an array, and their arrangement pattern corresponds to that of the product parts. A number of ejector pins 1 pass through the lower die core and abut against the lower end faces of the corresponding product parts to eject the product parts. Ejection holes are provided at the positions where several injection molding runners are connected. The ejector pins 2 extend into the ejection holes to block the bottoms of the ejection holes. At the same time, the formed injection molded products can be ejected.

[0015] Further, a second spring is sleeved outside each of the guide posts. One end of the second spring abuts against the lower end face of the lower template, and the other end abuts against the lower end face of the installation plate.

[0016] The beneficial effects of the present utility model:

[0017] In the present utility model, positioning sleeves are provided at the corner positions of the lower end face of the upper die base, buffer cavities for inserting the positioning sleeves are provided at the corner positions of the upper end face of the lower die base, and springs are arranged in the buffer cavities. When closing the mold, the pressure during mold closing is buffered by compressing the springs, thereby improving the service life of the mold.

[0018] By providing insertion blocks inside the positioning sleeves and slots corresponding to the insertion blocks on the buffer cavities, when the positioning sleeves are inserted into the buffer cavities, the insertion blocks are also inserted into the slots, further improving the accuracy of mold closing.

[0019] By setting a longer positioning sleeve and a deeper buffer cavity, during mold opening, the positioning sleeve can smoothly rise along the buffer cavity without disengaging from its interior. Therefore, during mold closing, there is no need to re-adjust the positioning, thus effectively improving the working efficiency.

[0020] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : Overall structure diagram of the present utility model.

[0022] Figure 2 : Exploded side cross-sectional view of the present utility model.

[0023] Figure 3 : Front cross-sectional view of the present utility model.

[0024] Figure 4 : Figure 3 Enlarged view of local structure A.

[0025] Figure 5 : Structure diagram of the lower mold base of the present utility model.

[0026] Figure 6 : Figure 5 Enlarged view of local structure B.

[0027] Figure 7 : Exploded view of the lower mold base of the present utility model.

[0028] Figure 8 : Figure 7 Enlarged view of local structure C.

[0029] Figure 9 : Figure 7 Enlarged view of local structure D.

[0030] Figure 10 : Figure 7 Enlarged view of local structure E.

[0031] Figure 11 : Side structure diagram of the present utility model.

[0032] 1. Upper mold base; 2. Lower mold base; 3. Upper fixed plate; 4. Hot runner plate; 5. Upper mold plate; 6. Lower fixed plate; 7. Support square iron; 8. Lower mold plate; 11. Positioning sleeve; 12. Insert; 21. Buffer cavity; 22. Slot; 23. Spring one; 31. Casting port; 41. Chamber; 51. Runner; 61. Ejector mechanism; 81. Lower mold core; 82. Injection molding station; 83. Installation station; 821. Injection runner; 822. Insert; 823. Through hole; 824. Ejector hole; 831. Product parts; 611. Push plate; 612. Installation plate; 613. Ejector one; 614. Ejector two; 615. Guide column; 616. Spring two. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] Please refer to Figure 1-11 ;

[0035] A brushless motor embedding injection mold, comprising an upper mold base 1 and a lower mold base 2 arranged relatively to each other, a positioning sleeve 11 is provided at the corner position of the lower end surface of the upper mold base 1, an insert block 12 is provided inside the positioning sleeve 11, a buffer cavity 21 for inserting the positioning sleeve 11 is provided at the upper end surface of the lower mold base 2, the positioning sleeve 11 and the buffer cavity 21 have the same outer diameter and inner diameter, when the upper mold base 1 and the lower mold base 2 are molded, the positioning sleeve 11 is inserted into the buffer cavity 21, which is used to position the mold when the mold is closed, and improve the accuracy of the mold closing, a spring 23 is provided in the buffer cavity 21, when the mold is closed, the pressure during the mold closing is buffered by compressing the spring 23, and the service life of the mold is improved, and the buffer cavity 21 is provided with a spring 23 that is opposite to the insert block 12. Corresponding slot 22, when the positioning sleeve 11 is inserted into the buffer cavity 21, the insert block 12 is also inserted into the slot 22, and is also used to position the upper mold base 1 and the lower mold base 2 when the mold is closed, so as to further improve the accuracy of the mold closing. It is explained here that the existing molds all use guide columns to pass through the mold for positioning. The mold positioning of this embodiment does not require the use of guide columns. The length of the positioning sleeve 11 is longer, and the depth of the buffer cavity 21 is deeper. When the mold is opened, the positioning sleeve 11 can rise smoothly along the buffer cavity 21. After the mold is opened, the positioning sleeve 11 still remains in the buffer cavity 21 and will not fall out of the buffer cavity 21. Therefore, when the mold is closed, there is no need to re-position and adjust, thereby effectively improving the work efficiency.

[0036] In addition, since the spring 1 23 will occupy a part of the space inside the buffer cavity 21, when the mold is closed, if the height of the positioning sleeve 11 is equal to or higher than the height of the buffer cavity 21, plus the height of the spring 1 23, the mold cannot be closed normally. Therefore, the utility model sets the height of the positioning sleeve 11 to be smaller than the height of the buffer cavity 21.

[0037] In this embodiment, the upper die base 1 includes an upper fixing plate 3, a hot runner plate 4, and an upper template 5 arranged from top to bottom. A pouring port 31 is provided on the upper fixing plate 3, and the injection liquid is injected through the pouring port 31. A chamber 41 communicating with the pouring port 31 is provided on the hot runner plate 4. Two runner channels 51 communicating with the chamber 41 are provided on the upper template 5. Preferably, two nozzles for introducing or discharging heating gas are provided on the hot runner plate 4. One ends of the two nozzles are connected through a heating channel inside the distribution nozzle hot runner plate 4, and the other ends are connected through an external heating device to maintain the heat of the hot runner plate 4 and ensure good fluidity of the plastic melt in the chamber 41.

[0038] Furthermore, a lower fixing plate 6 is provided on the lower die base 2. An ejection mechanism 61 is provided on the lower fixing plate 6. Supporting square iron 7 is provided on both sides of the ejection mechanism 61. A lower template 8 is provided on the supporting square iron 7. A lower die core 81 is provided inside the lower template 8. Injection stations 82 corresponding to the two runner channels 51 are provided on the lower die core 81. In addition, a number of condensation ports are provided on both the upper template 5 and the lower template 8. The number of condensation ports are respectively connected through a condensation channel for injecting and flowing out the condensate. The condensation channel is provided inside the lower die core 81 to accelerate the cooling of the lower die core 81 and improve the molding efficiency of the injection molded product.

[0039] Specifically, by injecting the injection liquid from the pouring port 31, the injection liquid flows from the chamber 41 along the runner channels 51 to the two injection stations 82 respectively and is molded at the two injection stations 82.

[0040] In this embodiment, an installation station 83 for installing the product part 831 is provided on the outer edge of the injection station 82. The injection station 82 includes injection runner channels 821 arranged in a circular array. Inserts 822 are provided at the ends of a number of injection runner channels 821. Through holes 823 for connecting the injection runner channels 821 with the installation station 83 are provided on the inserts 822. The product part 831 is in close fit with the through holes 823 to block the through holes 823 and prevent the injection liquid from flowing out. By using the product part 831 to block the through holes 823, the injection liquid can form an injection molded product that perfectly fits the product part 831. The through holes 823 are arranged downward to facilitate the ejection of the injection molded product. In addition, since the injection liquid contacts the product part 831 during molding, it will cause adhesion molding with the product part 831. Therefore, by appropriately surface-treating the surface of the product part 831, such as chrome plating, spraying Teflon (PTFE), or other low-friction coatings, the adhesion force can be significantly reduced, ensuring that the product part 831 and the injection molded product can be smoothly separated during ejection, and then connected through other steps later, so as to achieve the perfect fit between the injection molded product and the product part 831.

[0041] In this embodiment, the ejection mechanism 61 includes a push plate 611. An installation plate 612 for installing the first ejector pin 613 and the second ejector pin 614 is provided on the push plate 611. A number of guide posts 615 are passed through the installation plate 612. One end of the guide post 615 is connected to the lower fixed plate 6, and the other end is connected to the lower template 8. The guide post 615 is used to ensure that the push plate 611 and the installation plate 612 move smoothly and accurately during the movement process, preventing deviation or tilt during the ejection process, so as to ensure the accuracy of the ejection action.

[0042] In this embodiment, the first ejector pins 613 are arranged in an array, and their arrangement mode corresponds to the product part 831. Preferably, the product part 831 is a circular structure, and the first ejector pins 613 are arranged in a circular array. A number of first ejector pins 613 pass through the lower die core 81 and abut against the lower end surface of the corresponding product part 831. Ejection holes 824 are provided at the positions connected to a number of injection runners 821. The second ejector pins 614 extend into the ejection holes 824 and are used to block the bottom of the ejection holes. Preferably, the first ejector pins 613 and the second ejector pins 614 are respectively in close fit with the corresponding holes, ensuring that they will not break during the ejection of the product and improving the service life of the ejector pins. At the same time, the injection liquid will flow onto the second ejector pins 614 through the ejection holes 824, and the second ejector pins 614 block the ejection holes 824 to prevent the injection liquid from flowing out. When the injection liquid is molded and the mold is opened, then the push plate 611 is moved upward, and the push plate 611 drives the first ejector pins 613 and the second ejector pins 614 to move upward, thereby ejecting the product part 831 and the injection molded product.

[0043] In this embodiment, springs two 616 are sleeved outside the guide rods. One end of the spring two 616 abuts against the lower end surface of the lower template 8, and the other end abuts against the lower end surface of the installation plate 612. When the push plate 611 and the installation plate 612 move upward, the spring two 616 will be compressed. The compression of the spring two 616 can absorb the impact force generated during the ejection process, protect the mold from excessive stress, and extend the service life. When the ejection action is completed, the push plate 611 and the installation plate 612 need to be reset, and the restoring force of the spring two 616 helps the push plate 611 and the installation plate 612 to return to the initial position smoothly.

[0044] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0045] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. An injection mold for embedding a brushless motor, comprising an upper mold base (1) and a lower mold base (2) which are oppositely arranged, characterized in that, Positioning sleeves (11) are provided at the corner positions of the lower end surface of the upper die base (1). Insert blocks (12) are symmetrically arranged inside the positioning sleeves (11). Buffer cavities (21) for inserting the positioning sleeves (11) are provided at the corners of the upper end surface of the lower die base (2). A first spring (23) is arranged inside the buffer cavities (21) to buffer the pressure during mold closing. Slots (22) corresponding to the insert blocks (12) are symmetrically arranged on the buffer cavities (21). After mold opening, the positioning sleeves (11) remain inside the buffer cavities (21) and will not fall out of the buffer cavities (21).

2. The injection mold for embedding a brushless motor according to claim 1, wherein, The height of the positioning sleeve (11) is less than the height of the buffer cavity (21).

3. The injection mold for embedding a brushless motor according to claim 1, characterized in that, The upper die base (1) includes an upper fixing plate (3), a hot runner plate (4), and an upper template (5) arranged from top to bottom. A pouring port (31) is provided on the upper fixing plate (3). A cavity (41) communicating with the pouring port (31) is provided on the hot runner plate (4). Two runners (51) communicating with the cavity (41) are provided on the upper template (5).

4. A plastic injection mold for embedding a brushless motor according to claim 1, characterized in that, A lower fixing plate (6) is provided on the lower die base (2). An ejection mechanism (61) is provided on the lower fixing plate (6). Support square iron blocks (7) are arranged on both sides of the ejection mechanism (61). A lower template (8) is provided on the support square iron blocks (7). A lower die insert (81) is arranged inside the lower template (8). Injection molding stations (82) corresponding to the two runners (51) are provided on the lower die insert (81).

5. The injection mold for embedding a brushless motor according to claim 4, characterized in that, An installation station (83) for installing product parts (831) is provided on the outer edge of the injection molding station (82). The injection molding station (82) includes injection molding runners (821) arranged in a circular array. Inserts (822) are provided at the ends of several injection molding runners (821). Through holes (823) for communicating the injection molding runners (821) with the installation station (83) are provided on the inserts (822). The product parts (831) are in close contact with the through holes (823) to block the through holes (823) and prevent the injection liquid from flowing out.

6. The injection mold for embedding a brushless motor according to claim 5, characterized in that, The through holes (823) are arranged obliquely downward to facilitate the ejection mechanism (61) to eject the injection molded parts.

7. An injection mold for embedding a brushless motor, as claimed in claim 6, wherein The ejection mechanism (61) includes a push plate (611). An installation plate (612) for installing a first ejector pin (613) and a second ejector pin (614) is provided on the push plate (611). A number of guide posts (615) are inserted through the installation plate (612). One end of the guide posts (615) is connected to the lower fixing plate (6), and the other end is connected to the lower template (8).

8. An injection mold for embedding a brushless motor, according to claim 7, characterized in that, The first ejector pins (613) are arranged in an array, and their arrangement pattern corresponds to the product parts (831). A number of first ejector pins (613) pass through the lower die insert (81) and abut against the lower end surfaces of the corresponding product parts (831) to eject the product parts (831). Ejection holes (824) are provided at the positions where several injection molding runners (821) are connected. The second ejector pins (614) extend into the ejection holes (824) to block the bottoms of the ejection holes (824). At the same time, they can eject the formed injection molded products.

9. The injection mold for embedding a brushless motor according to claim 7, characterized in that, A second spring (616) is sleeved outside each of the plurality of guide posts (615). One end of the second spring (616) abuts against the lower end surface of the lower template (8), and the other end abuts against the lower end surface of the mounting plate (612).

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