Plastic frame injection molding device

Abstract

The invention relates to the technical field of plastic frame production, and provides a plastic frame injection molding device which comprises a mounting table, a fixed mold and a movable mold which can be matched with each other are arranged on the mounting table and used for injection molding of a plastic frame, the movable mold comprises a base, and a peripheral frame is arranged on the side, facing the fixed mold, of the base. First mold core plates capable of horizontally moving are arranged in the peripheral frame in a bilateral symmetry mode so that the left first mold core plate and the right first mold core plate can get close to each other or get away from each other. According to the injection mold, the defects in the prior art are overcome, the design is reasonable, the structure is compact, by arranging the first mold core plate and the second mold core plate which can be separated from each other, large deformation and damage of injection molding parts in the discharging process can be avoided, and the injection molding finished product rate and the yield are greatly increased. In the discharging process, the injection molding part adhering to the second mold core plate can be pushed firstly, then the injection molding part is ejected out through the ejection rod, it can be further guaranteed that the injection molding part does not have large deformation in the demolding process, and the quality of the injection molding part is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic frame production, and particularly relates to an injection molding device for plastic frames. Background Art

[0002] As an indispensable basic plastic product in multiple industries such as packaging, logistics, and warehousing, the market demand for plastic frames is increasing with the rapid development of the modern logistics and packaging industries. Injection molding technology, with its multiple advantages such as high production efficiency, low manufacturing cost, and stable product quality, has become the preferred process for plastic frame manufacturing.

[0003] However, when faced with products such as plastic frames with complex surface structures and high dimensional accuracy requirements, in the demolding process, due to their complex and variable surface structures, such as designs like ribs, buckles, and grooves, the demolding process of plastic frames becomes particularly complex. When the traditional ejection mechanism ejects the plastic frame from the mold, the plastic frame often deforms due to uneven force or excessive ejection force, thereby affecting the dimensional accuracy and appearance quality of the product. In severe cases, it may even cause product damage, increase the scrap rate, and raise the production cost. Therefore, we propose an injection molding device for plastic frames. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides an injection molding device for plastic frames, which overcomes the deficiencies of the prior art, is reasonably designed, has a compact structure, and solves the problem that existing plastic frames are prone to deformation during injection molding and demolding.

[0006] (2) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: An injection molding device for plastic frames includes an installation table, on which a fixed mold and a movable mold that can cooperate with each other are provided for the injection molding of plastic frames. The movable mold includes a base, on the side of the base facing the fixed mold, there is an outer frame. Inside the outer frame, there are two horizontally movable first core plates symmetrically arranged left and right to realize the approach or separation of the two first core plates on the left and right. Inside the outer frame, there are two vertically movable second core plates symmetrically arranged up and down to realize the approach or separation of the two second core plates on the up and down.

[0008] Preferably, on the mutually facing-away sides of the symmetrically arranged first core plates, there are first positioning grooves, and on the mutually facing-away sides of the symmetrically arranged second core plates, there are second positioning grooves. The widths of the inner sides of the first positioning grooves and the second positioning grooves facing the base gradually decrease. The periphery of the fixed mold convex is provided with a positioning plate that cooperates with the first positioning grooves and the second positioning grooves, so that when the moving mold approaches the fixed mold for clamping, the positioning plate pushes the first core plates and the second core plates through the first positioning grooves and the second positioning grooves to form a complete injection mold cavity.

[0009] Preferably, on one side of the first core plate facing the outer frame, there is a first slide bar penetrating the outer frame. Between the first core plate and the outer frame, there is a first spring. On one side of the second core plate facing the outer frame, there is a second slide bar penetrating the outer frame. Between the second core plate and the outer frame, there is a second spring.

[0010] Preferably, a ejecting mechanism is provided inside the moving mold. The ejecting mechanism includes an ejecting rod penetrating the base. One end of the ejecting rod away from the moving mold is connected to the side of the base facing away from the fixed mold through a third spring.

[0011] Preferably, on both sides of the ejecting rod, there are symmetrically arranged convex blocks. On the side of the base facing away from the fixed mold, there is an L-shaped limiting plate. The limiting plate includes a horizontal plate connected to the base and a hook plate abutting against the side of the convex block away from the base to prevent the ejecting rod from moving relative to the base towards the side away from the fixed mold.

[0012] Preferably, on the upper and lower sides of the moving mold, there is a material pushing mechanism. The material pushing mechanism includes symmetrically arranged upper and lower material pushing plates. The material pushing plates are in a T-shaped structure, which includes a plate part and a rod part. Its plate part is located on the front side of the second core plate. The rod part penetrates the second core plate and is connected with a wedge-shaped block. Between the wedge-shaped block and the second core plate, there is a connection through a fourth spring. Inside the base, there is a sliding connection with a push rod. One end of the push rod is provided with a slope corresponding to the wedge-shaped block to push the wedge-shaped block, and the other end is connected to the side of the base facing away from the fixed mold through a fifth spring.

[0013] Preferably, on the mounting table, there is a first fixing rod that cooperates with the ejecting rod, and on the mounting table, there is a second fixing rod that cooperates with the push rod. The relative distance between the second fixing rod and the push rod is less than the relative distance between the first fixing rod and the ejecting rod.

[0014] Preferably, on the mounting table, there is a servo cylinder. The output end of the servo cylinder is connected to the side of the base facing away from the fixed mold. On the mounting table, there are several guiding rods that penetrate the base to allow the base to slide along the direction of the guiding rods to realize the mold opening and closing of the moving mold and the fixed mold.

[0015] Preferably, inside the second core plate, there is a receiving groove for receiving the material pushing plate to make the surface of the material pushing plate flush with the surface of the second core plate.

[0016] (III) Beneficial effects

[0017] The embodiment of the present invention provides an injection molding device for a plastic frame, which has the following beneficial effects:

[0018] 1. By providing a first core plate and a second core plate that can be separated from each other, it is possible to avoid large deformation and damage of the injection molded part during the blanking process, greatly improving the injection molding yield and the good rate.

[0019] 2. During blanking, the injection molded part adhered to the second core plate can be pushed first, and then the injection molded part can be ejected by the ejector rod, which can further ensure that the injection molded part will not undergo large deformation during demolding, further improving the quality of the injection molded part. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0021] Figure 2 of the present invention Figure 1 is a left three-dimensional schematic diagram of the structure;

[0022] Figure 3 is a three-dimensional schematic diagram of the fixed mold and the moving mold structures of the present invention;

[0023] Figure 4 is a three-dimensional schematic diagram of the moving mold structure of the present invention;

[0024] Figure 5 is a three-dimensional schematic diagram of the base structure of the present invention;

[0025] Figure 6 is a three-dimensional schematic diagram of the first core plate and the second core plate structures of the present invention;

[0026] Figure 7 is a side three-dimensional schematic diagram of the receiving groove of the second core plate structure of the present invention.

[0027] In the figure: 1. Installation table; 2. Fixed mold; 21. Positioning plate; 3. Moving mold; 31. Base; 32. Outer frame; 33. First core plate; 331. First positioning groove; 332. First sliding rod; 333. First spring; 34. Second core plate; 341. Second positioning groove; 342. Second sliding rod; 343. Second spring; 344. Receiving groove; 351. Ejector rod; 352. Third spring; 353. First fixing rod; 354. Convex block; 355. Limiting plate; 361. Stripping plate; 362. Wedge block; 363. Fourth spring; 364. Push rod; 365. Fifth spring; 366. Second fixing rod; 4. Servo cylinder; 5. Guide rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Referring to the attached Figures 1-7 , a plastic frame injection molding device includes an installation table 1. A fixed mold 2 and a movable mold 3 that can cooperate with each other are provided on the installation table 1 for injection molding of a plastic frame. The movable mold 3 includes a base 31. A servo cylinder 4 is provided on the installation table 1. The output end of the servo cylinder 4 is connected to the side of the base 31 facing away from the fixed mold 2. A plurality of guide rods 5 are provided on the installation table 1. The guide rods 5 penetrate through the base 31. When the servo cylinder 4 is started, the base 31 slides along the direction of the guide rods 5, further causing the entire movable mold 3 to slide along the direction of the guide rods 5, thereby realizing the mold opening and closing of the movable mold 3 and the fixed mold 2. Through the plurality of guide rods 5, the mold closing is more accurate when the movable mold 3 approaches the fixed mold 2, providing a stable basis for subsequent injection molding.

[0030] On the side of the base 31 facing the fixed mold 2, an outer frame 32 is provided. Horizontally movable first mold core plates 33 are symmetrically provided on the left and right inside the outer frame 32 to realize the approach or separation of the two first mold core plates 33 on the left and right. Horizontally symmetrically arranged chutes for the first mold core plates 33 to slide are provided inside the outer frame 32 to ensure the stability of the horizontal movement of the first mold core plates 33. Vertically movable second mold core plates 34 are symmetrically provided on the upper and lower inside the outer frame 32 to realize the approach or separation of the two second mold core plates 34 on the upper and lower. Vertically symmetrically arranged chutes for the second mold core plates 34 to move up and down are provided inside the outer frame 32 to ensure the stability of the second mold core plates 34 during the up and down movement. By providing separable first mold core plates 33 and second mold core plates 34, after the injection molding and cooling are completed, controlling the two first mold core plates 33 to move in opposite directions and the two second mold core plates 34 to move in opposite directions, the plastic frame will not be severely deformed when the protrusions on the first mold core plates 33 and the second mold core plates 34 are pulled out from the injection-molded plastic frame, greatly improving the quality of injection molding and the yield rate.

[0031] On one side of the symmetrically arranged first core plates 33 facing away from each other, there are first positioning grooves 331. On one side of the symmetrically arranged second core plates 34 facing away from each other, there are second positioning grooves 341. The width of the inner sides of the first positioning grooves 331 and the second positioning grooves 341 gradually decreases towards the base 31. There is a positioning plate 21 on the periphery of the convex part of the fixed mold 2 that cooperates with the first positioning grooves 331 and the second positioning grooves 341. When the moving mold 3 moves towards the fixed mold 2 to close the mold, the positioning plate 21 pushes the first core plates 33 and the second core plates 34 through the first positioning grooves 331 and the second positioning grooves 341 to form a complete injection mold cavity. When in use, start the servo cylinder 4, and the moving mold 3 moves along the direction of the guide rod 5 and closes the mold with the fixed mold 2. At this time, the positioning plate 21 on the periphery of the convex part of the fixed mold 2 will insert into the first positioning grooves 331 and the second positioning grooves 341, and as the mold closes, the two first core plates 33 approach each other, and the two second core plates 34 approach each other. When the moving mold 3 and the fixed mold 2 complete the mold closing, at this time, the two first core plates 33 and the two second core plates 34 cooperate with the convex part of the fixed mold 2 and the base 31 to form a complete injection mold cavity. During the mold closing process, the separated core plates can be combined into a complete injection mold cavity without other external forces, greatly reducing the cost of the equipment.

[0032] On one side of the first core plate 33 facing the outer frame 32, there is a first slide bar 332 passing through the outer frame 32. Between the first core plate 33 and the outer frame 32, there is a first spring 333. During the mold closing process, the first core plate 33 will move along the first slide bar 332 for precise mold closing. When demolding, driven by the first spring 333, the first core plate 33 moves in the reverse direction. At this time, the protrusions on the first core plate 33 will be horizontally pulled out from the injection-molded plastic frame, thus reducing the deformation of the plastic frame during demolding. On one side of the second core plate 34 facing the outer frame 32, there is a second slide bar 342 passing through the outer frame 32. Between the second core plate 34 and the outer frame 32, there is a second spring 343. When closing the mold, the second core plate 34 will move along the second slide bar 342 for precise mold closing. When demolding, driven by the second spring 343, the second core plate 34 moves in the reverse direction. At this time, the protrusions on the second core plate 34 will be vertically pulled out from the injection-molded plastic frame, thus reducing the deformation of the plastic frame during demolding.

[0033] There is an ejection mechanism inside the moving mold 3. The ejection mechanism includes an ejection rod 351 penetrating the base 31. One end of the ejection rod 351 away from the moving mold 3 is connected to the side of the base 31 facing away from the fixed mold 2 through a third spring 352. After demolding, push the ejection rod 351, and the ejection rod 351 pushes the plastic frame in the moving mold 3 to push out the injection-molded plastic frame, realizing the process of automatic blanking.

[0034] On both sides of the ejector rod 351, bumps 354 are symmetrically provided. On the side of the base 31 away from the fixed mold 2, an L-shaped limit plate 355 is provided. The limit plate 355 includes a horizontal plate connected to the base 31 and a hook plate abutting against the side of the bump 354 away from the base 31, so as to prevent the ejector rod 351 from moving relative to the base 31 away from the fixed mold 2. During mold closing and injection molding, under the action of the limit plate 355, the ejector rod 351 does not need to move away from the fixed mold 2, avoiding the movement of the ejector rod 351 during injection molding and forming redundant injection protrusions at its position, which affects the product quality.

[0035] Ejecting mechanisms are provided on the upper and lower sides of the moving mold 3. The ejecting mechanisms include ejector plates 361 symmetrically arranged up and down. The ejector plates 361 are in a T-shaped structure, which includes a plate part and a rod part. Its plate part is located on the front surface of the second die core plate 34, and the rod part penetrates the second die core plate 34 and is connected with a wedge-shaped block 362. A fourth spring 363 is connected between the wedge-shaped block 362 and the second die core plate 34. A push rod 364 is slidably connected in the base 31. One end of the push rod 364 is provided with a slope corresponding to the wedge-shaped block 362 to push the wedge-shaped block 362, and the other end is connected to the side of the base 31 away from the fixed mold 2 through a fifth spring 365. During mold opening, first, the push rods 364 on the upper and lower sides are made to push the wedge-shaped block 362. At this time, after the inclined surface of the wedge-shaped block 362 is stressed, the ejector plates 361 on the upper and lower sides move. When the injection-molded plastic frame adheres to the second die core plates 34 on the upper and lower sides, the ejector plates 361 can push the second die core plates 34 off. During this process, the plastic frame moves vertically with a small deformation amount and will not cause damage or deformation to it.

[0036] On the mounting table 1, a first fixing rod 353 cooperating with the ejector rod 351 is provided. On the mounting table 1, a second fixing rod 366 cooperating with the push rod 364 is provided. The relative distance between the second fixing rod 366 and the push rod 364 is less than the relative distance between the first fixing rod 353 and the ejector rod 351. During mold opening, the second fixing rod 366 will first push the push rod 364, and the push rod 364 moves before the ejector rod 351, which can prevent the ejector rod 351 from directly pushing the plastic frame when the plastic frame adheres to the second die core plate 34, resulting in large deformation and damage due to inclined blanking.

[0037] In the second die core plate 34, a receiving groove 344 for receiving the ejector plate 361 is provided, so that the surface of the ejector plate 361 is flush with the surface of the second die core plate 34, ensuring the surface integrity of the injection-molded plastic frame and improving the injection accuracy.

[0038] Working principle: Start the servo cylinder 4. At this time, the moving mold 3 moves towards the fixed mold 2 for mold clamping. At this time, the first core plate 33 and the second core plate 34 enclose each other, and cooperate with the mold convex of the fixed mold 2 and the base 31 to form a complete injection mold cavity. After injection molding, start the servo cylinder 4 again to make the moving mold 3 move away from the fixed mold 2 for mold opening. During this process, the second fixing rod 366 will first push the push rod 364, and push the plastic frame adhered to the second core plate 34 down through the ejector plate 361. Then, the first fixing rod 353 pushes the ejector rod 351 to move, and the plastic frame is pushed out of the moving mold 3.

[0039] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection molding device for a plastic frame, comprising an installation table (1), wherein a fixed mold (2) and a movable mold (3) which can cooperate with each other are arranged on the installation table (1) for injection molding of the plastic frame, and the characteristics are as follows: The moving mold (3) includes a base (31). On one side of the base (31) facing the fixed mold (2), there is a peripheral frame (32). Inside the peripheral frame (32), first core plates (33) that can move horizontally are symmetrically arranged on the left and right to achieve the approach or separation of the two first core plates (33) on the left and right. Inside the peripheral frame (32), second core plates (34) that can move up and down are symmetrically arranged above and below to achieve the approach or separation of the two second core plates (34) above and below.

2. The plastic frame injection molding device according to claim 1, characterized in that: On the mutually facing sides of the symmetrically arranged first core plates (33), there are first positioning grooves (331). On the mutually facing sides of the symmetrically arranged second core plates (34), there are second positioning grooves (341). The widths of the inner sides of the first positioning grooves (331) and the second positioning grooves (341) facing the base (31) gradually decrease. Around the convex part of the fixed mold (2), there is a positioning plate (21) that cooperates with the first positioning grooves (331) and the second positioning grooves (341). When the moving mold (3) approaches the fixed mold (2) for clamping, the positioning plate (21) pushes the first core plates (33) and the second core plates (34) through the first positioning grooves (331) and the second positioning grooves (341) to form a complete injection mold cavity.

3. A plastic frame injection molding device according to claim 2, characterized in that: On one side of the first core plate (33) facing the peripheral frame (32), there is a first slide bar (332) that penetrates the peripheral frame (32). Between the first core plate (33) and the peripheral frame (32), there is a first spring (333). On one side of the second core plate (34) facing the peripheral frame (32), there is a second slide bar (342) that penetrates the peripheral frame (32). Between the second core plate (34) and the peripheral frame (32), there is a second spring (343).

4. A plastic frame injection molding device according to any one of claims 1-3, characterized in that: Inside the moving mold (3), there is an ejection mechanism. The ejection mechanism includes an ejection rod (351) that penetrates the base (31). One end of the ejection rod (351) away from the moving mold (3) is connected to the side of the base (31) facing away from the fixed mold (2) through a third spring (352).

5. The injection molding device for a plastic frame according to claim 4, characterized in that: On both sides of the ejection rod (351), there are symmetrically arranged convex blocks (354). On the side of the base (31) facing away from the fixed mold (2), there is an L-shaped limit plate (355). The limit plate (355) includes a horizontal plate connected to the base (31) and a hook plate that abuts against the side of the convex block (354) away from the base (31) to prevent the ejection rod (351) from moving relative to the base (31) away from the fixed mold (2).

6. The injection molding device for a plastic frame according to claim 4, characterized in that: A knockout mechanism is provided on the upper and lower sides of the moving mold (3). The knockout mechanism includes knockout plates (361) symmetrically arranged up and down. The knockout plates (361) are in a T-shaped structure, which includes a plate part and a rod part. The plate part is located on the front surface of the second core plate (34), and the rod part penetrates the second core plate (34) and is connected with a wedge block (362). The wedge block (362) is connected to the second core plate (34) through a fourth spring (363). A push rod (364) is slidably connected in the base (31). One end of the push rod (364) is provided with a slope corresponding to the wedge block (362) to push the wedge block (362), and the other end is connected to the side of the base (31) away from the fixed mold (2) through a fifth spring (365).

7. The injection molding device for a plastic frame according to claim 6, characterized in that: A first fixing rod (353) for cooperating with the ejector rod (351) is provided on the mounting table (1). A second fixing rod (366) for cooperating with the push rod (364) is provided on the mounting table (1). The relative distance between the second fixing rod (366) and the push rod (364) is less than the relative distance between the first fixing rod (353) and the ejector rod (351).

8. The injection molding device for a plastic frame according to claim 7, wherein: A servo cylinder (4) is provided on the mounting table (1). The output end of the servo cylinder (4) is connected to the side of the base (31) away from the fixed mold (2). A plurality of guide rods (5) are provided on the mounting table (1). The guide rods (5) penetrate the base (31) to allow the base (31) to slide along the direction of the guide rods (5) to realize the mold opening and closing of the moving mold (3) and the fixed mold (2).

9. The injection molding device for a plastic frame according to claim 6, characterized in that: A receiving groove (344) for receiving the knockout plate (361) is provided in the second core plate (34) so that the surface of the knockout plate (361) is flush with the surface of the second core plate (34).

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