An injection molding apparatus based on powdered resin

Abstract

The utility model discloses an injection molding device based on powdered resin, including upper die and lower mould, the upper die includes fixed cover, frame and plastic seal part, and the top between fixed cover and the top of plastic seal part is provided with floating mechanism, and the upper die still includes the injection mechanism of setting in the middle part of fixed cover, and the injection mechanism includes injection block and a plurality of adjusting assembly, and injection block penetrates the thickness direction of plastic seal part, and the adsorption circuit is seted up in plastic seal part, the first accommodating groove for containing powdered resin is seted down to the top surface of lower mould, floating mechanism has first state and second state, and when floating mechanism is in first state, the bottom surface of plastic seal part is located below the bottom surface of fixed cover, and when floating mechanism is in second state, the bottom surface of plastic seal part is flush with the bottom surface of fixed cover, the injection molding device of the utility model can effectively save production cost, improve production efficiency and product quality, and effectively avoid separating film embedding into plastic seal body when resin injection molding.

Description

Technical Field

[0001] This utility model belongs to the field of semiconductor injection molding technology, specifically relating to an injection molding device based on powdered resin. Background Technology

[0002] Injection molding is a crucial step in the semiconductor packaging process. Existing injection molding equipment typically includes components such as a press, mold frame, and mold. The mold usually has multiple barrels, the specific number of which depends on the product to be packaged. Each barrel contains an injection head. In addition, injection molding requires filler material, currently typically columnar resin, which is obtained by compressing powdered resin. The shape and size of the columnar resin must match the shape and size of the barrels. During the injection molding process, the frame is first placed into the mold, then the columnar resin is filled into each barrel, the mold is closed, and injection begins. After holding pressure, the mold is opened, and the resulting product is removed.

[0003] However, since columnar resin is produced by compressing powdered resin into cylindrical shapes before it can be used in injection molding equipment, a separate automated production line is usually required for processing. This leads to increased production costs and lower production efficiency. Furthermore, the barrel in existing equipment restricts the arrangement and shape of the flow channels, resulting in low overall resin utilization and further increasing production costs. In addition, the columnar resin obtained after compression processing inevitably has weight and dimensional deviations, and excessive deviations will affect the quality of the encapsulated products. Moreover, the compression processing technology varies for different types of powdered resin raw materials, which increases the difficulty and complexity of processing. The size of the columnar resin obtained after compression processing also varies for different types of powdered resin raw materials, resulting in poor adaptability to different encapsulated products. In addition, in the existing technology, when using a release membrane for assisted molding, the release membrane and pre-filled resin are in the same lower mold. As the injection structure moves, the injection rod of the lower mold will rise during molding, causing the release membrane to be lifted and embedded in the encapsulation body, making it impossible for the resin to separate from the release membrane. Utility Model Content

[0004] In view of this, in order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide an improved injection molding apparatus based on powdered resin.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An injection molding apparatus based on powdered resin includes an upper mold and a lower mold. The upper mold includes a fixed cover plate, frame edges located at both ends of the fixed cover plate, and a sealing portion located at the bottom of the fixed cover plate. The sealing portion is located between the two frame edges. A floating mechanism is provided between the top of the fixed cover plate and the top of the sealing portion. The upper mold also includes an injection mechanism disposed in the middle of the fixed cover plate. The injection mechanism includes an injection block and multiple adjusting components. The injection block extends through the thickness direction of the sealing portion. An adsorption circuit for adsorbing a separation membrane is formed in the sealing portion. The lower mold has a first receiving groove for holding powdered resin formed from its top surface downwards. The injection block is used to cooperate with the first receiving groove.

[0007] The floating mechanism has a first state and a second state. When the floating mechanism is in the first state, the bottom surface of the plastic seal is located below the bottom surface of the fixed cover plate. When the floating mechanism is in the second state, the bottom surface of the plastic seal is flush with the bottom surface of the fixed cover plate.

[0008] According to some preferred embodiments of the present invention, the injection molding mechanism further includes a pad block, and a plurality of the adjusting components are evenly spaced along the length direction of the injection molding block. Each adjusting component includes a first elastic element and a first guide post. The first elastic element is sleeved on the outer periphery of the first guide post. The pad block is located between the first elastic element and the injection molding block, and the pad block is fixedly connected to the injection molding block. The first guide post passes through the top of the fixed cover plate and the pad block, and the bottom of the first guide post is fixedly connected to the injection molding block. The adjusting components can be used to adjust the injection pressure of the injection molding block on the powdered resin contained in the first receiving tank during injection molding.

[0009] According to some preferred embodiments of the present invention, the top of the fixed cover plate is provided with a plurality of second receiving grooves, each of which corresponds to a first elastic member. The second receiving groove is used to receive the first elastic member, one end of the first elastic member is in contact with the top surface of the pad, and the other end of the first elastic member is in contact with the top surface of the second receiving groove.

[0010] According to some preferred embodiments of the present invention, the height of the second receiving groove is less than the length of the first elastic member in its natural state, and when the first elastic member is in its natural state, there is a gap between the top surface of the pad and the bottom surface of the second receiving groove. This gap between the top surface of the pad and the bottom surface of the second receiving groove provides a certain space for compensating for injection pressure. Since the amount of powdered resin distributed in the first receiving groove is fluctuating, providing such a compensation space in the upper mold can prevent resin overflow caused by pressure overflow when the amount of resin is excessive.

[0011] In some embodiments of this utility model, the first elastic element is preferably a disc spring. In actual operation, the injection pressure and injection stroke can be adjusted by using different numbers of disc springs in straight or parallel combinations, according to the injection pressure requirements of the injection molded product.

[0012] According to some preferred embodiments of the present invention, the floating mechanism includes a pad and a plurality of floating components disposed on the pad. Each floating component includes a limiting post, a limiting seat, and a second elastic element sleeved on the outer periphery of the limiting post. The bottom of the limiting post is fixedly connected to the top of the limiting seat. A first through groove is provided in the middle of the pad for the injection molding mechanism to pass through.

[0013] According to some preferred embodiments of this utility model, the top of the fixed cover plate is further provided with a plurality of third receiving grooves, each of which corresponds to a second elastic member. The third receiving groove is used to accommodate the second elastic member. The height of the third receiving groove is less than the length of the second elastic member in its natural state, and the diameter of the third receiving groove is greater than or equal to the outer diameter of the limiting seat. One end of the second elastic member contacts the top surface of the limiting seat, and the other end of the second elastic member contacts the top surface of the third receiving groove. The pad plate has a fourth receiving groove for accommodating the limiting seat, the height of which is equal to the height of the limiting seat. When the floating mechanism is in the first state, the second elastic member is in its natural state; when the floating mechanism is in the second state, the second elastic member is in a compressed state.

[0014] According to some preferred embodiments of the present invention, the encapsulation part includes a first flow channel plate and second flow channel plates symmetrically arranged on both sides of the first flow channel plate. A second through groove for the injection molding block to pass through is opened in the middle of the first flow channel plate. A third through groove is opened in the middle of each second flow channel plate. An encapsulation plate is provided in each third through groove. The first flow channel plate, the second flow channel plate and the encapsulation plate are all fixedly connected to the pad.

[0015] According to some preferred embodiments of the present invention, the top surface of the first flow channel plate is flush with the top surfaces of the second flow channel plate and the molding plate, the bottom surface of the first flow channel plate is flush with the bottom surface of the second flow channel plate, the height of the molding plate is less than the height of the second flow channel plate, and the bottom surface of each molding plate, together with the bottom surface and inner wall of a corresponding second flow channel plate, forms a molding area; the sum of the heights of the pad and the injection block is greater than the sum of the heights of the pad and the first flow channel plate, and the bottom surface of the injection block protrudes downward from the bottom surface of the first flow channel plate;

[0016] The bottom surface of the first flow channel plate has multiple first flow channels evenly spaced on one side near each second flow channel plate. The bottom surface of each second flow channel plate also has multiple second flow channels evenly spaced on one side near the first flow channel plate. Each second flow channel on the second flow channel plate corresponds one-to-one with the first flow channel on the corresponding side of the first flow channel plate, and each second flow channel is connected to its corresponding first flow channel. Each second flow channel is also connected to its corresponding molding area. The arrangement direction of the multiple first flow channels on each side of the first flow channel plate is parallel to the length direction of the injection block, and the length of the arrangement of the multiple first flow channels on each side of the first flow channel plate is within the length range of the injection block. In some embodiments of this invention, the protrusion height of the injection block relative to the bottom surface of the first flow channel plate is related to the amount of powdered resin pre-filled in the first receiving groove of the lower mold. When the amount of resin is large, a higher protrusion height and a larger injection stroke are required. Therefore, it can be adjusted by replacing shims of different heights according to actual needs to obtain suitable injection pressure and injection stroke.

[0017] According to some preferred embodiments of the present invention, the floating mechanism further includes a plurality of second guide posts, and the top of the fixed cover plate is provided with a plurality of fifth receiving slots, the fifth receiving slots being arranged one-to-one with the second guide posts. Each second guide post includes a column body and a sleeve body fitted around the outer periphery of the column body. The outer wall of the column body fits against the inner wall of the sleeve body, and the length of the column body is greater than the length of the sleeve body. The column body penetrates the top of the fixed cover plate and the pad plate, and the bottom of the column body is fixedly connected to the second flow channel plate.

[0018] According to some preferred embodiments of the present invention, each of the fifth receiving grooves includes a first groove and a second groove that are interconnected. The first groove is located above the second groove. The diameter of the first groove is larger than the diameter of the second groove. The diameter of the second groove is smaller than the outer diameter of the top end of the sleeve and larger than or equal to the outer diameter of the bottom end of the sleeve. The first groove is used to accommodate the top end and a portion of the bottom end of the sleeve. The second groove is used to accommodate the remaining portion of the bottom end of the sleeve, and the height of the second groove is smaller than the length of the bottom end of the sleeve. In some embodiments of the present invention, the floating mechanism is used to provide the injection stroke of the injection block and the clamping pressure at the interface between the upper and lower molds, thereby preventing resin from overflowing from the mold. When the upper and lower molds are closed and in the holding pressure stage, the second elastic element in the floating mechanism is compressed to its limit. The distance between the bottom surface of the top end of the sleeve of the second limiting post and the bottom surface of the first groove of the fifth receiving groove is the injection stroke of the injection block.

[0019] By adopting the above technical solutions, compared with the prior art, this utility model provides an injection molding device based on powdered resin. By setting a floating mechanism and an injection mechanism in the upper mold and setting an adsorption circuit in the encapsulation part, and opening a first receiving groove in the lower mold to cooperate with the injection block in the injection mechanism for holding powdered resin, the injection mechanism is integrated into the upper mold of the injection molding device. There is no need to use the encapsulation press to compress the powdered resin in advance, which can effectively save production costs, improve production efficiency, and avoid the weight and size deviation of the resin caused by compression processing, which is conducive to improving product quality. In addition, the pre-filled powdered resin is set on the lower mold, and the separation film is adsorbed by the upper mold, which can effectively prevent the separation film from embedding into the encapsulated body (encapsulated product) and being unable to separate during resin injection molding. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the upper mold (floating mechanism in the first state) of the injection molding device in a preferred embodiment of the present invention.

[0022] Figure 2 This is a three-dimensional structural diagram of the lower mold of the injection molding device in a preferred embodiment of the present invention;

[0023] Figure 3 This is a side view of the structure of the upper mold after a frame is hidden when the floating mechanism is in the first state in the preferred embodiment of this utility model;

[0024] Figure 4 This is a side view of the structure of the upper mold after a frame is hidden when the floating mechanism is in the second state in the preferred embodiment of this utility model;

[0025] Figure 5 This is a bottom view of the upper mold of the injection molding device in a preferred embodiment of the present invention.

[0026] Figure 6 This is a side view of the injection molding device in the preferred embodiment of the present invention when the floating mechanism is in the second state;

[0027] Figure 7 This is a top view of the upper mold in the second state of the preferred embodiment of the present invention;

[0028] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure along the AA direction;

[0029] Figure 9 for Figure 7 A schematic diagram of the cross-sectional structure along the BB direction;

[0030] Figure 10 This is a three-dimensional structural diagram of the injection molding mechanism in a preferred embodiment of the present invention;

[0031] Figure 11 This is a three-dimensional structural diagram of the pad of the floating mechanism in a preferred embodiment of the present invention;

[0032] Figure 12 This is a three-dimensional structural diagram of the first flow channel plate of the encapsulation part in a preferred embodiment of the present invention;

[0033] Figure 13 This is an exploded view of the second flow channel plate and a corresponding sealing plate of the encapsulation part in a preferred embodiment of the present invention;

[0034] Figure 14 This is a top view of the second flow channel plate and a corresponding sealing plate in a preferred embodiment of the present invention.

[0035] The attached figures are labeled as follows:

[0036] Upper mold-1, fixed cover plate-11, second receiving groove-111, third receiving groove-112, first groove-1131, second groove-1132, suction hole-114, frame-12, molding part-13, first flow channel plate-131, first flow channel-1311, seventh through hole-1312, second through groove-C2, second flow channel plate-132, second flow channel-1321, second groove-1322, third through hole-1323, third groove-1324, fourth through hole-1325, fifth through hole-1326, sixth through hole-1327, fourth groove -1328, Fifth Groove -1329, Third Through Groove -C3, Plastic Sealing Plate -133, Sixth Groove -1331, Seventh Groove -1332, Eighth Groove -1333, Adsorption Groove -134, Injection Block -141, First Groove -1411, First Elastic Component -142, Pad Block -143, First Guide Post -144, Pad Plate -151, First Through Groove -C1, Fourth Receiving Groove -1512, Limiting Post -152, Limiting Seat -153, Second Elastic Component -154, Column -1551, Sleeve -1552, Lower Mold -2, First Receiving Groove -21. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0038] Reference Figures 1 to 14 This embodiment provides an injection molding apparatus based on powdered resin for injection molding powdered resin. The injection molding apparatus includes an upper mold 1 and a lower mold 2. The upper mold 1 includes a fixed cover plate 11, frame 12 located at both ends of the fixed cover plate 11 and fixedly connected to the fixed cover plate 11, a sealing part 13 located at the bottom of the fixed cover plate 11, a floating mechanism disposed between the top of the fixed cover plate 11 and the top of the sealing part 13, and an injection mechanism disposed in the middle of the fixed cover plate 11. The sealing part 13 is located between the two frame 12. The lower mold 2 has a first receiving groove 21 for holding powdered resin with its top surface facing downward.

[0039] Furthermore, such as Figure 3 , Figure 4 , Figure 8 , Figure 9 and Figure 11 As shown, the floating mechanism includes a pad 151, multiple second guide posts, and multiple floating components disposed on the pad 151. A first through groove C1 for the injection molding mechanism to pass through is provided in the middle of the pad 151. In this embodiment, two rows of floating components are symmetrically arranged on the left and right sides of the first through groove C1, and the multiple floating components in each row are evenly spaced. Each floating component includes a limiting post 152, a limiting seat 153, and a second elastic member 154 sleeved on the outer periphery of the limiting post 152. The bottom of the limiting post 152 is fixedly connected to the top of the limiting seat 153. The outer diameter of the limiting seat 153 is larger than the outer diameter of the limiting post 152, and the center of the limiting seat 153 is aligned with that of the limiting post 152. A fourth receiving groove 1512 for accommodating the limiting seat 153 is provided on the pad 151 from its top surface downwards. The height of the fourth receiving groove 1512 is equal to the height of the limiting seat 153. The top of the fixed cover plate 11 is also provided with a plurality of third receiving grooves 112 and a plurality of fifth receiving grooves. The third receiving grooves 112 are arranged one-to-one with the second elastic members 154 and are used to accommodate the second elastic members 154. The fifth receiving grooves are arranged one-to-one with the second guide posts.

[0040] Specifically, the height of the third receiving groove 112 is less than the length of the second elastic member 154 in its natural state, and the diameter of the third receiving groove 112 is greater than or equal to the outer diameter of the limiting seat 153. One end of the second elastic member 154 contacts the top surface of the limiting seat 153, and the other end of the second elastic member 154 contacts the top surface of the third receiving groove 112. This ensures that when the pad 151 and the limiting seat 153 are lifted upwards by an external force, the limiting seat 153 has sufficient space to compress the second elastic member 154 upwards. In this embodiment, the second elastic member 154 is preferably a spring. The floating mechanism has a first state and a second state. When the floating mechanism is in the first state, the second elastic member 154 is in its natural state, such as... Figure 3 As shown, at this time, the bottom surface of the molding part 13 is located below the bottom surface of the fixed cover plate 11. At this time, the upper mold 1 and the lower mold 2 are not yet closed or are in the initial stage of mold closing (the injection molding mechanism has not yet applied injection pressure to the powdered resin support in the first receiving groove 21); when the floating mechanism is in the second state, the second elastic element 154 is in a compressed state (at this time, the second elastic element 154 is compressed to the limit, the injection stroke of the injection molding mechanism has reached the maximum, and the upper mold 1 and the lower mold 2 are completely closed), as Figure 4 As shown, the bottom surface of the plastic sealing part 13 is flush with the bottom surface of the fixed cover plate 11.

[0041] Furthermore, in this embodiment, as Figure 3 and Figure 7As shown, two rows of second guide posts are symmetrically arranged on the left and right sides of the injection molding mechanism. Two second guide posts are spaced apart in each of the two rows on each side, and one second guide post in each row on each side is staggered with an adjacent second guide post in the adjacent row. A second guide post is also provided at each end of the first through groove C1. Each second guide post includes a post body 1551 and a sleeve 1552 fitted around the periphery of the post body 1551. The outer wall of the post body 1551 fits against the inner wall of the sleeve 1552, and the length of the post body 1551 is greater than the length of the sleeve 1552. The post body 1551 penetrates the top of the fixed cover plate 11 and the thickness direction of the pad plate 151, and the bottom of the post body 1551 is fixedly connected to the second flow channel plate 132. Each fifth receiving slot includes a first slot portion 1131 and a second slot portion 1132 that are interconnected. The first slot portion 1131 is located above the second slot portion 1132. The diameter of the first slot portion 1131 is larger than the diameter of the second slot portion 1132. The diameter of the second slot portion 1132 is smaller than the outer diameter of the top end of the sleeve 1552 and is greater than or equal to the outer diameter of the bottom end of the sleeve 1552. The first slot portion 1131 is used to receive a portion of the top end and the bottom end of the sleeve 1552. The second slot portion 1132 is used to receive the remaining portion of the bottom end of the sleeve 1552 and the height of the second slot portion 1132 is smaller than the length of the bottom end of the sleeve 1552. The floating mechanism is used to provide the injection stroke of the injection molding mechanism and the clamping pressure at the interface between the upper mold 1 and the lower mold 2, thereby preventing resin from overflowing from the mold. The second guide post is not only used to guide the up and down movement of the floating mechanism, but also to provide the injection stroke of the injection molding mechanism through the cooperation between the second guide post and the fifth receiving groove. Specifically, when the upper mold 1 and the lower mold 2 are closed and in the holding pressure stage, the second elastic element 154 in the floating mechanism has been compressed to its limit. At this time, the distance between the bottom surface of the top of the sleeve 1552 of the second limiting post 152 and the bottom surface of the first groove 1131 of the fifth receiving groove is the injection stroke of the injection molding mechanism.

[0042] Furthermore, such as Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 9 , Figures 12 to 14As shown, the molding section 13 includes a first flow channel plate 131 and second flow channel plates 132 symmetrically arranged on both sides of the first flow channel plate 131. The first flow channel plate 131 has a second through groove C2 for the injection molding mechanism to pass through in the middle. Each second flow channel plate 132 has a third through groove C3 in the middle. Each third through groove C3 is provided with a molding plate 133. The first flow channel plate 131, the second flow channel plate 132 and the molding plate 133 are all fixedly connected to the pad 151. The top surface of the first runner plate 131 is flush with the top surfaces of the second runner plate 132 and the molding plate 133. The bottom surface of the first runner plate 131 is flush with the bottom surface of the second runner plate 132. The height of the molding plate 133 is less than the height of the second runner plate 132, that is, the bottom surface of the molding plate 133 is located above the bottom surface of the second runner plate 132, so that the bottom surface of each molding plate 133 together with the bottom surface and inner wall of the corresponding second runner plate 132 forms a molding area to form a molding product.

[0043] The bottom surface of the first flow channel plate 131 is provided with a plurality of first flow channels 1311 at equal intervals on one side of each second flow channel plate 132. The bottom surface of each second flow channel plate 132 is provided with a plurality of second flow channels 1321 at equal intervals on one side of the first flow channel plate 131. The second flow channels 1321 on each second flow channel plate 132 are provided in a one-to-one correspondence with the first flow channels 1311 on the corresponding side of the first flow channel plate 131, and each second flow channel 1321 is connected to a corresponding first flow channel 1311. Each second flow channel 1321 is also connected to a corresponding molding area. The arrangement direction of the plurality of first channels 1311 opened on each side of the first flow channel plate 131 is parallel to the length direction of the injection block 141, and the length of the plurality of first channels 1311 opened on each side of the first flow channel plate 131 is within the length range of the injection block 141, so as to ensure that the resin squeezed out from the first receiving groove 21 by the injection molding mechanism during the injection molding process can flow to the corresponding encapsulation area through the first channel 1311 and the second channel 1321 respectively.

[0044] Furthermore, such as Figure 1 , Figure 5 , Figures 7 to 10As shown, the injection molding mechanism includes an injection block 141, a pad 143, and multiple adjustment components. The multiple adjustment components are evenly spaced along the length direction of the injection block 141. Each adjustment component includes a first elastic element 142 and a first guide post 144. The first elastic element 142 is sleeved on the outer periphery of the first guide post 144. The pad 143 is located between the first elastic element 142 and the injection block 141 and is fixedly connected to the injection block 141. The first guide post 144 penetrates the top of the fixed cover plate 11 and the thickness direction of the pad 143. The bottom of the first guide post 144 is fixedly connected to the injection block 141. The pad 143 is located in the first through groove C1. The sum of the heights of the pad 143 and the injection block 141 is greater than the sum of the heights of the pad plate 151 and the first runner plate 131. A portion of the injection block 141 is located in the first through groove C1, and another portion of the injection block 141 passes through the second through groove C2. The bottom surface of the injection block 141 protrudes downward from the bottom surface of the first runner plate 131 to cooperate with the first receiving groove 21 on the top surface of the lower mold 2 to extrude the powdered resin therein. In this embodiment, the protrusion height of the injection block 141 relative to the bottom surface of the first runner plate 131 is related to the amount of powdered resin pre-filled in the first receiving groove 21 of the lower mold 2. When the amount of resin is large, a higher protrusion height and a larger injection stroke are required. Therefore, it can be adjusted by replacing the pad 143 with different heights according to actual needs to obtain a suitable injection pressure and injection stroke.

[0045] The top of the fixed cover plate 11 is provided with multiple second receiving grooves 111, each corresponding to a first elastic member 142. The second receiving groove 111 accommodates the first elastic member 142. One end of the first elastic member 142 contacts the top surface of the pad block 143, and the other end contacts the top surface of the second receiving groove 111. During injection molding, when the upper mold 1 and lower mold 2 close and the injection block 141 compresses the powdered resin in the first receiving groove 21, the injection block 141 receives a reaction force and outputs injection force to the powdered resin in the lower mold through the first elastic member 142. The adjustment component can be used to adjust the injection pressure of the injection block 141 on the powdered resin in the first receiving groove 21 during injection. In this embodiment, the first elastic member 142 is preferably a disc spring. In actual operation, different numbers of disc springs can be used in different straight or parallel combinations to adjust the injection pressure and injection stroke according to the injection pressure requirements of the injection-molded product. The height of the second receiving groove 111 is less than the length of the first elastic member 142 in its natural state. When the first elastic member 142 is in its natural state, there is a gap between the top surface of the pad 143 and the bottom surface of the second receiving groove 111, so that there is a certain space between the top surface of the pad 143 and the bottom surface of the second receiving groove 111 for compensation of injection pressure. Since the amount of powdered resin in the first receiving groove 21 is fluctuating, setting such a compensation space in the upper mold 1 can prevent resin overflow caused by pressure overflow when the amount of resin is too large.

[0046] Furthermore, the molding part 13 of the upper mold 1 is provided with an adsorption circuit for adsorbing the separation membrane, and the injection molding block 141 has a first groove 1411 formed around its outer wall from the outer surface inward, such as... Figure 10 As shown, the adsorption circuit is connected to the first groove 1411 of the injection molding block 141. Specifically, the adsorption circuit in this embodiment is configured as follows:

[0047] like Figure 1 As shown, one end of the fixed cover plate 11 has four air intake holes 114 extending inward from its outer surface. Each pair of air intake holes 114 corresponds to a second flow channel plate 132 and a molding plate 133. The length of the air intake hole 114 is less than the thickness of the frame 12. A first through hole (not shown) is then formed downward from the end of each air intake hole 114 near the floating mechanism. Part of the first through hole is located in the fixed cover plate 11, and the other part is located in the frame 12. A second through hole (not shown) is then formed inward from the end of each first through hole located in the frame 12 until the second through hole penetrates the side of the frame 12 near the molding portion 13. Figure 9 , Figure 13 and Figure 14As shown, each of the two second flow channel plates 132 has a second groove 1322 formed from the outer wall inward on the outer side near the second through hole. One second groove 1322 on one second flow channel plate 132 is simultaneously connected to the two corresponding second through holes. Each second flow channel plate 132 also has a third through hole 1323 formed at both ends. The third through hole 1323 penetrates the thickness direction of the end of the second flow channel plate 132. One third through hole 1323 near the second groove 1322 on one second flow channel plate 132 is connected to the second groove 1322, and one end of the third through hole 1323 is located inside the second groove 1322. Each second flow channel plate 132 also has a third groove 1324 formed downward on both ends of the top surface, and a fourth through hole 1325 is formed downward from the bottom surface of the third groove 1324 until the fourth through hole 1325 is connected to one end of the third through hole 1323. Furthermore, an adsorption groove 134 is formed along the edges of the bottom surfaces of the two second flow channel plates 132 and the first flow channel plate 131. Multiple fifth through holes 1326, penetrating the thickness direction of the second flow channel plates 132, are spaced upwards from the bottom surface at positions corresponding to the adsorption grooves 134. Each second flow channel plate 132 has four fifth through holes 1326 spaced apart at both ends along its length. The bottom surface of each fifth through hole 1326 at the end of the second flow channel plate 132 communicates with the adsorption groove 134, and its top surface communicates with the third groove 1324. Each second flow channel plate 132 has multiple sixth through holes 1327 on both sides along its length. One end of one of the sixth through holes 1327 on one side communicates with the middle of the fifth through hole 1326, and the other end penetrates the inner wall of that side of the second flow channel plate 132. A fourth groove 1328, parallel to the length direction of the second flow channel plate 132, is formed inwardly on the outer wall of the second flow channel plate 132 near the first flow channel plate 131. One end of a plurality of sixth through holes 1327 on this side of the second flow channel plate 132 communicates with the fourth groove 1328, and the other end penetrates the inner wall of the second flow channel plate 132 on this side. Simultaneously, a plurality of fifth grooves 1329 are also formed inwardly on the outer wall of each second flow channel plate 132 near the first flow channel plate 131. The depth of the fifth grooves 1329 is less than the depth of the fourth grooves 1328. One end of each fifth groove 1329 communicates with the fourth groove 1328, and the other end of the first and last fifth grooves 1329 on each second flow channel plate 132 communicates with the adsorption groove 134. The other ends of the remaining fifth grooves 1329 communicate with the second flow channel 1321. Figure 12 As shown, the first flow channel plate 131 has a plurality of seventh through holes 1312 evenly spaced on both sides along its length direction. The seventh through holes 1312 penetrate the wall thickness of the side wall of the first flow channel plate 131. One end of the seventh through hole 1312 is connected to the first groove 1411 of the injection block 141, and the other end of the seventh through hole 1312 is connected to the fourth groove 1328.

[0048] like Figure 9 and Figure 13 As shown, each plastic sealant 133 has a sixth groove 1331 formed from the outer surface inward along its outer wall, and each plastic sealant 133 has a seventh groove 1332 formed from the outer surface inward at both ends near the third through hole 1323. The length direction of the seventh groove 1332 is parallel to the height direction of the plastic sealant 133. The bottom end of the seventh groove 1332 is connected to the sixth groove 1331, and the top end of the seventh groove 1332 is connected to one end of the corresponding third through hole 1323. In addition, each plastic sealant 133 also has a plurality of eighth grooves 1333 formed at intervals from the outer surface inward along its outer wall. The length direction of the eighth groove 1333 is also parallel to the height direction of the plastic sealant 133. The top end of the eighth groove 1333 is connected to the sixth groove 1331, and the bottom surface of the eighth groove 1333 is flush with the bottom surface of the plastic sealant 133.

[0049] Due to the design of the injection molding mechanism of this invention, during the process of the injection block 141 extruding the powdered resin in the first receiving groove 21, the injection block 141 remains fixed, while the floating mechanism causes the entire encapsulation part 13 to float. Furthermore, there is a gap between the inner wall of the first flow channel plate 131 of the floating part and the outer wall of the injection block 141. Gas enters the first groove 1411 from the adsorption circuit and reaches the gap between the side wall of the injection block 141 and the bottom surface of the first flow channel plate 131 through these gaps, thereby adsorbing the separation film at the bottom of the upper mold 1. In addition, the bottom surface of the interface between the second flow channel plate 132 and the first flow channel plate 131, corresponding to the position of the fourth groove 1328, and the edge of the bottom surface of the encapsulation plate 133 can also adsorb the separation film. The adsorption circuit in this embodiment utilizes multi-point adsorption in both the inner and outer rings to effectively reduce wrinkles and damage to the separation film, ensuring the appearance quality of the injection molded product, and facilitating product demolding after injection molding.

[0050] The working process of the injection molding device of this utility model is as follows:

[0051] The vacuum adsorption device is turned on to adsorb the separation membrane onto the bottom of the upper mold 1. Then, the substrate (or frame) of the product to be molded is placed on the lower mold 2, and powdered resin is laid in the first receiving groove 21 of the lower mold 2. The upper mold 1 and the lower mold 2 are closed. In the initial stage of mold closing, the protruding part of the injection block 141 is located in the first receiving groove 21, and the bottom surface of the molding part 13 is in contact with the top surface of the lower mold 2 (there is a gap between the bottom surface of the four periphery of the fixed cover plate 11 and the top surface of the lower mold 2). At this time, the second elastic element 154 is in a natural state. As the mold closing position continues to rise, the second elastic element 154 in the floating mechanism is gradually compressed. The injection mechanism applies injection pressure to the powdered resin of the lower mold 2 through the first elastic element 142 until the upper mold 1 and the lower mold 2 are completely closed (that is, the bottom surface of the four periphery of the fixed cover plate 11 and the bottom surface of the molding part 13 are in contact with the top surface of the lower mold 2). The injection is completed. Then, the device is opened and the product is taken out.

[0052] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. An injection molding apparatus based on powdered resin, comprising an upper mold and a lower mold, wherein the upper mold includes a fixed cover plate, frame edges located at both ends of the fixed cover plate, and a molding compound located at the bottom of the fixed cover plate, the molding compound being located between the two frame edges, characterized in that, A floating mechanism is provided between the top of the fixed cover plate and the top of the encapsulation part. The upper mold also includes an injection molding mechanism located in the middle of the fixed cover plate. The injection molding mechanism includes an injection block and multiple adjustment components. The injection block extends through the thickness direction of the encapsulation part. An adsorption circuit for adsorbing the separation membrane is provided in the encapsulation part. The lower mold has a first receiving groove for holding powdered resin from its top surface downwards. The injection block is used to cooperate with the first receiving groove. The floating mechanism has a first state and a second state. When the floating mechanism is in the first state, the bottom surface of the plastic seal is located below the bottom surface of the fixed cover plate. When the floating mechanism is in the second state, the bottom surface of the plastic seal is flush with the bottom surface of the fixed cover plate.

2. The injection molding apparatus according to claim 1, characterized in that, The injection molding mechanism also includes a pad block. A plurality of the adjustment components are evenly spaced along the length of the injection molding block. Each adjustment component includes a first elastic element and a first guide post. The first elastic element is sleeved on the outer periphery of the first guide post. The pad block is located between the first elastic element and the injection molding block. The pad block is fixedly connected to the injection molding block. The first guide post passes through the top of the fixed cover plate and the pad block, and the bottom of the first guide post is fixedly connected to the injection molding block.

3. The injection molding apparatus according to claim 2, characterized in that, The top of the fixed cover plate is provided with a plurality of second receiving slots, and the second receiving slots are respectively provided with the first elastic members. The second receiving slots are used to receive the first elastic members. One end of the first elastic member is in contact with the top surface of the pad, and the other end of the first elastic member is in contact with the top surface of the second receiving slot.

4. The injection molding apparatus according to claim 3, characterized in that, The height of the second receiving groove is less than the length of the first elastic member in its natural state, and when the first elastic member is in its natural state, there is a gap between the top surface of the pad and the bottom surface of the second receiving groove.

5. The injection molding apparatus according to claim 2, characterized in that, The floating mechanism includes a pad and multiple floating components disposed on the pad. Each floating component includes a limiting post, a limiting seat, and a second elastic element sleeved on the outer periphery of the limiting post. The bottom of the limiting post is fixedly connected to the top of the limiting seat. A first through groove is provided in the middle of the pad for the injection molding mechanism to pass through.

6. The injection molding apparatus according to claim 5, characterized in that, The top of the fixed cover plate is also provided with a plurality of third receiving grooves, each corresponding to a second elastic member. Each third receiving groove is used to accommodate a second elastic member, and its height is less than the length of the second elastic member in its natural state. The diameter of the third receiving groove is greater than or equal to the outer diameter of the limiting seat. One end of the second elastic member contacts the top surface of the limiting seat, and the other end of the second elastic member contacts the top surface of the third receiving groove. The pad plate has a fourth receiving groove extending downwards from its top surface to accommodate the limiting seat, and the height of the fourth receiving groove is equal to the height of the limiting seat. When the floating mechanism is in the first state, the second elastic member is in its natural state; when the floating mechanism is in the second state, the second elastic member is in a compressed state.

7. The injection molding apparatus according to claim 5, characterized in that, The encapsulation section includes a first flow channel plate and second flow channel plates symmetrically arranged on both sides of the first flow channel plate. The first flow channel plate has a second through groove in the middle for the injection molding block to pass through. Each second flow channel plate has a third through groove in the middle. Each third through groove is provided with an encapsulation plate. The first flow channel plate, the second flow channel plate and the encapsulation plate are all fixedly connected to the pad.

8. The injection molding apparatus according to claim 7, characterized in that, The top surface of the first flow channel plate is flush with the top surfaces of the second flow channel plate and the molding plate. The bottom surface of the first flow channel plate is flush with the bottom surface of the second flow channel plate. The height of the molding plate is less than the height of the second flow channel plate. The bottom surface of each molding plate, together with the bottom surface and inner wall of the corresponding second flow channel plate, forms a molding area. The sum of the heights of the pad and the injection block is greater than the sum of the heights of the pad and the first flow channel plate. The bottom surface of the injection block protrudes downward from the bottom surface of the first flow channel plate. The bottom surface of the first flow channel plate has a plurality of first flow channels evenly spaced on one side near each second flow channel plate. The bottom surface of each second flow channel plate has a plurality of second flow channels evenly spaced on one side near the first flow channel plate. The second flow channels on each second flow channel plate are arranged in a one-to-one correspondence with the first flow channels on the corresponding side of the first flow channel plate, and each second flow channel is connected to a corresponding first flow channel. Each second flow channel is also connected to a corresponding molding area. The arrangement direction of the plurality of first flow channels on each side of the first flow channel plate is parallel to the length direction of the injection molding block, and the arrangement length of the plurality of first flow channels on each side of the first flow channel plate is within the length range of the injection molding block.

9. The injection molding apparatus according to claim 7, characterized in that, The floating mechanism also includes multiple second guide posts, and the top of the fixed cover plate is provided with multiple fifth receiving slots. The fifth receiving slots are arranged one-to-one with the second guide posts. Each second guide post includes a column body and a sleeve body fitted around the outer periphery of the column body. The outer wall of the column body fits against the inner wall of the sleeve body, and the length of the column body is greater than the length of the sleeve body. The column body penetrates the top of the fixed cover plate and the pad plate, and the bottom of the column body is fixedly connected to the second flow channel plate.

10. The injection molding apparatus according to claim 9, characterized in that, Each of the fifth receiving slots includes a first slot and a second slot that are in communication with each other. The first slot is located above the second slot. The diameter of the first slot is greater than the diameter of the second slot. The diameter of the second slot is less than the outer diameter of the top end of the sleeve and greater than or equal to the outer diameter of the bottom end of the sleeve. The first slot is used to receive a portion of the top end and the bottom end of the sleeve. The second slot is used to receive the remaining portion of the bottom end of the sleeve, and the height of the second slot is less than the length of the bottom end of the sleeve.

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