Ejection injection molding structure for four clamping blocks of plastic part of access cover plate

Abstract

The utility model provides an access cover plate plastic part four fixture block ejection injection molding structure, which comprises an upper mold, a lower mold and an ejection mechanism, the ejection mechanism comprises four core-pulling structures and a straight ejection structure, the four core-pulling structures are circumferentially arranged on the lower mold, each core-pulling structure comprises a fixture block, an inclined guide pillar and a spring, and the straight ejection structure is arranged on the lower mold. The clamping block slides on the lower die, an inclined hole is formed in the clamping block, the inclined hole is used for being connected with the inclined guide column in an inserted mode, the inclined guide column is arranged on the upper die, the two ends of the spring are fixedly connected with the clamping block and the lower die respectively, the spring is kept in a stretching state all the time, and when the die is closed, the inclined guide column is inserted into the inclined hole to drive the clamping block to abut against the lower die. When the mold is opened, the inclined guide column is drawn out, the spring drives the clamping block to be away from the lower mold, and the straight ejection structure is used for ejecting the overhaul cover plate plastic part in the mold opening direction. The clamping block is used for forming the clamping structure, the clamping block is abutted against the lower die through the inclined guide column during die assembly, then the inclined guide column is drawn out and the clamping block is ejected out through the spring during die opening, so that the clamping structure is drawn out, and the clamping structure cannot be damaged due to the fact that the upper die or the lower die is clamped in the groove when the straight ejection structure is ejected out at the moment; and the inclined guide pillar is arranged on the upper die, so that the movement of the inclined guide pillar is automatically completed in the die opening and closing process, and the integrity is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of molds, and in particular to a four-block ejection injection molding structure for a maintenance cover plastic part. Background Technology

[0002] To reduce the overall weight of vehicles, automakers have replaced some die-cast metal parts with injection-molded plastic parts, such as inspection covers.

[0003] Related technologies for automotive inspection covers, such as Figure 1 As shown, the inspection cover plastic part 7 has multiple snap-fit ​​structures 71 circumferentially arranged. The snap-fit ​​structure 71 has a flange 74 on its side. The flange 74 and the snap-fit ​​structure 71 together form a groove 75. The bottom surface of the groove 75 is perpendicular to the length of the cover. If the upper mold is used to form the groove, the mold will remain stuck in the upper mold through the groove after the mold is opened and will be difficult to remove. If the lower mold or both the upper and lower molds are used to form the groove, the mold will be damaged during the ejection process. Utility Model Content

[0004] This application provides a four-block ejection injection molding structure for a plastic inspection cover, which can automatically avoid the snap-fit ​​structure when the mold is opened after molding.

[0005] The technical solution provided in this application for a four-block ejection injection molding structure for a maintenance cover plastic part is as follows:

[0006] A four-block ejection injection molding structure for a plastic inspection cover includes an upper mold, a lower mold, and an ejection mechanism. The ejection mechanism includes four core-pulling structures and a straight ejection structure. The four core-pulling structures are circumferentially arranged on the lower mold. Each core-pulling structure includes a locking block, an inclined guide post, and a spring. The locking block slides on the lower mold and has an inclined hole for inserting the inclined guide post. The inclined guide post is located on the upper mold. The two ends of the spring are fixedly connected to the locking block and the lower mold, respectively. The spring is always in a stretched state. When the mold is closed, the inclined guide post is inserted into the inclined hole, driving the locking block to abut against the lower mold and forming a locking structure together with the lower mold. When the mold is opened, the inclined guide post is pulled out, and the spring drives the locking block away from the lower mold. The straight ejection structure is used to eject the plastic inspection cover along the mold opening direction.

[0007] The above technical solution uses a locking block to form the locking structure. When the mold is closed, the block is abutted against the lower mold by an inclined guide post. When the mold is opened, the inclined guide post is pulled out and the locking block is pushed out by a spring, so that the locking structure is pulled out. At this time, the locking structure will not be damaged by the upper or lower mold locking in the groove. By setting the inclined guide post on the upper mold, the movement of the inclined guide post is automatically completed during the mold opening and closing process, which enhances the integrity.

[0008] Preferably, the straight top structure comprises a first top plate and a plurality of straight top columns, the first top plate moves along the opening and closing direction, one end of the plurality of straight top columns is arranged on the first top plate, and the other end abuts on the bottom surface of the plastic cover plate, and the plurality of straight top columns are used to push out the plastic cover plate along the opening direction.

[0009] Through the above technical scheme, the straight top structure can effectively push out the formed mold, so that the opening process is more smooth and efficient, and at the same time, since the stretchers are also arranged on the bottom surface of the plastic cover plate, the straight top column is designed to fit the stretchers, reducing the case of stretching the stretchers during the opening process.

[0010] Preferably, the oblique guide column has an inclination angle of 15° to 25°, and the length of the oblique guide column is greater than the length of the oblique hole of the clamping block.

[0011] Through the above technical scheme, when the oblique guide column is pulled out and inserted into the oblique hole, the inclination angle is less than 15°, which is easy to wear, and greater than 25°, which is easy to be stuck when sliding between the clamping blocks due to too large friction.

[0012] Preferably, it further comprises a limiting structure, the limiting structure comprises a limiting block, the limiting block is arranged on one side of the lower mold close to the outside, the limiting block is used to limit the moving distance of the clamping block along the length direction of the spring, and the clamping block is further provided with a avoiding slot matched with the clamping block.

[0013] Through the above technical scheme, the design of the limiting block limits the activity distance of the clamping block, so that the oblique guide column can accurately enter the oblique hole of the clamping block during closing, and finally the clamping block can abut on the lower mold smoothly, increasing the safety.

[0014] Preferably, it further comprises a push plate structure, the push plate structure comprises a second top plate and a plurality of push rods, the second top plate moves along the opening and closing direction, the second top plate is located below the first top plate, one end of the plurality of push rods is arranged on the second top plate, a top block is further fixed on the push rod, the top block abuts on the bottom surface of the plastic cover plate, the top block is located between the clamping blocks, and the top block is used to form the side edge of the plastic cover plate together with the lower mold.

[0015] Through the above technical scheme, since the reinforcing rib grid is also arranged circumferentially around the stretchers, the contact area between the straight top column designed to fit the stretchers and the bottom surface of the plastic cover plate is small, the design of the push rod and the top block increases the contact area between the straight top structure and the plastic cover plate, and then the straight top process is more stable, ensuring the stability during the opening process.

[0016] Preferably, the push rod is further provided with an ejection groove, and the push rod passes through the first top plate through the ejection groove. The length direction of the ejection groove is the same as the length direction of the push rod. When the first top plate moves along the mold opening direction, the first top plate abuts against the top wall of the ejection groove when the second top plate is not moving, and the push rod is driven to follow the first top plate to move along the mold opening direction.

[0017] The above technical solution reduces the situation where only the direct ejector structure works due to malfunction. The design of the movable groove allows the push rod to work even when only the first ejector plate is moving, ensuring that the mold can be successfully demolded even when only the first ejector plate is working.

[0018] Preferably, it also includes a reinforced ejection structure, which includes multiple ejector pins. One end of each ejector pin is disposed on a second top plate, and the other end of each ejector pin is circumferentially disposed on the lower mold. The ejector pins are located between the straight ejector structures, and the ejector pins are used to assist the straight ejector structures in ejecting the inspection cover plastic part.

[0019] The addition of ejector pins through the above technical solution is to further enhance the ejection effect on the plastic parts of the inspection cover.

[0020] The main technical effects of this utility model are reflected in the following aspects:

[0021] 1. This utility model, through the design of a core-pulling structure, automatically exposes the snap-fit ​​structure during mold opening, reducing the possibility of damage to the snap-fit ​​structure;

[0022] 2. This utility model, through the design of multiple simultaneous ejection, further reduces the possibility of tearing the stretching ribs during mold opening, thus ensuring the ejection effect;

[0023] 3. This utility model designs an movable groove so that the push rod can also work when only the first top plate is moving, ensuring that the mold can be successfully demolded even when only the first top plate is working. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the related technology;

[0025] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the structure of this application embodiment with the upper mold removed;

[0027] Figure 4 This is a schematic diagram of the structure on the back of the card block in an embodiment of this application;

[0028] Figure 5 This is a partial structural schematic diagram of the ejection mechanism in an embodiment of this application.

[0029] Mark No. : 1, upper die; 11, injection port; 2, lower die; 3, ejection mechanism; 31, core-pulling structure; 311, clamping block; 3111, inclined hole; 312, inclined guide pillar; 3121, matching groove; 313, spring; 32, straight ejection structure; 321, first top plate; 322, straight ejection pillar; 33, push plate structure; 331, second top plate; 332, push rod; 333, top block; 334, ejection groove; 34, reinforced ejection structure; 341, ejector pin; 4, cavity; 5, limiting structure; 51, limiting block; 52, avoiding groove; 6, cooling pipeline; 7, maintenance cover plate plastic part; 71, clamping structure; 72, tensile reinforcement; 73, reinforcement grid; 74, flange; 75, groove. DETAILED DESCRIPTION

[0030] The utility model discloses a maintenance cover plate plastic part four clamping block ejection injection molding structure: Figures 1-5 The utility model discloses a maintenance cover plate plastic part four clamping block ejection injection molding structure:

[0031] The utility model discloses a maintenance cover plate plastic part four clamping block ejection injection molding structure:

[0032] Referring to Figures 2-5 A maintenance cover plate plastic part four clamping block ejection injection molding structure, including upper die 1, lower die 2 and ejection mechanism 3, ejection mechanism 3 includes four core-pulling structure 31 and straight ejection structure 32, four core-pulling structure 31 is fixed on lower die 2 periphery, and core-pulling structure 31 includes clamping block 311, inclined guide pillar 312 and spring 313, clamping block 311 slides on lower die 2, and the inclined hole 3111 of clamping block 311 is seted up, and the inclined hole 3111 is used for inserting inclined guide pillar 312, and the matching groove 3121 of inclined guide pillar 312 is seted up, and inclined guide pillar 312 is fixed on upper die 1 through the cooperation of bolt and matching groove 3121, and the both ends of spring 313 are fixedly connected with clamping block 311 and lower die 2, and spring 313 always keeps tensile state, when moulding, inclined guide pillar 312 inserts into inclined hole 3111 and drives clamping block 311 to abut on lower die 2, and is used for and lower die 2 jointly forming clamping structure 71, when opening mould, inclined guide pillar 312 is extracted, and spring 313 drives clamping block 311 to be away from lower die 2, and straight ejection structure 32 is used for ejecting maintenance cover plate plastic part 7 along the opening mould direction. Clamping block 311 is used to form clamping structure 71, and when moulding, it is abutted on lower die 2 through inclined guide pillar 312, then when opening mould, inclined guide pillar 312 is extracted and clamping block 311 is ejected with spring 313, so that clamping structure 71 is extracted, at this time, the ejection of straight ejection structure 32 will not damage clamping structure 71 due to the clamping of upper die 1 or lower die 2 in groove 75, and the activity of inclined guide pillar 312 is automatically completed during the opening and closing of mould, and the integrity is enhanced.

[0033] Referring to Figures 2-3The upper die 1, the lower die 2 and the ejection mechanism 3 jointly form a mold cavity 4 for casting, the upper die 1 comprises an injection port 11 and a flow channel in communication with the injection port 11, the flow channel is in communication with the injection port 11 and the mold cavity 4, the injection port 11 is connected with an external injection molding machine, and the injection port 11 is used for injecting plastic into the mold cavity 4 to form the plastic cover plate 7.

[0034] Referring to Figure 5 The straight ejection structure 32 comprises a first top plate 321 and a plurality of straight ejection columns 322, and generally adopts a power source arranged on an injection molding machine to drive the first top plate 321 to move along the mold opening and closing direction, one end of the straight ejection column 322 is fixed on the first top plate 321, and the other end abuts against the bottom surface of the plastic cover plate 7, the straight ejection column 322 is used for forming the side surface of the rib 72, and the straight ejection column 322 is used for ejecting the plastic cover plate 7 along the mold opening direction. The straight ejection structure 32 can effectively eject the molded mold, so that the mold opening process is more smooth and efficient, and at the same time, since the stretch rib is also fixed on the bottom surface of the plastic cover plate 7, the straight ejection column 322 is designed to fit the stretch rib, thereby reducing the case of stretching the stretch rib during the mold opening process.

[0035] Referring to Figure 3 The inclined angle of the inclined guide column 312 is between 15° and 25°, and the length of the inclined guide column 312 is greater than the length of the inclined hole 3111 of the clamping block 311. When the inclined guide column 312 is extracted and inserted into the inclined hole 3111, the inclined angle is less than 15°, which is easy to wear, and greater than 25°, which is easy to be stuck when sliding between the clamping block 311 due to too large friction.

[0036] Referring to Figure 4 The limiting structure 5 comprises a limiting block 51 fixed on the side of the lower die 2 close to the outside, the limiting block 51 is used for limiting the moving distance of the clamping block 311 along the length direction of the spring 313, and the clamping block 311 is further provided with an avoiding groove 52 matched with the clamping block 311. The design of the limiting block 51 limits the movement distance of the clamping block 311, so that the inclined guide column 312 can accurately enter the inclined hole 3111 of the clamping block 311 when the mold is closed, and finally the clamping block 311 can abut against the lower die 2 smoothly, thereby increasing the safety.

[0037] Referring to Figure 5Further comprising a push plate structure 33, the push plate structure 33 comprises a second top plate 331 and a plurality of push rods 332, generally a power source is arranged on an injection molding machine to drive the second top plate 331 to move along the opening and closing direction of the mold, the second top plate 331 is located below the first top plate 321, one end of the plurality of push rods 332 abuts on the second top plate 331, and a top block 333 is further fixed on the push rod 332, the top block 333 abuts on the bottom surface of the maintenance cover plate plastic part 7, and the top block 333 is located between the clamping blocks 311, and the top block 333 is used for co-molding the side edges of the maintenance cover plate plastic part 7 together with the lower mold 2. Because the reinforcing rib grid 73 is also arranged circumferentially on the tensile rib 72, the straight top column 322 designed in combination with the tensile rib has a small contact area with the bottom surface of the maintenance cover plate plastic part 7, and the design of the push rod 332 and the top block 333 increases the contact area between the straight top structure 32 and the maintenance cover plate plastic part 7, thereby making the straight top process more stable and ensuring the stability during the mold opening process.

[0038] With reference to Figure 5 A push-out groove 334 is further arranged on the push rod 332, the push rod 332 passes through the first top plate 321 through the push-out groove 334, the length direction of the push-out groove 334 is the same as the length direction of the push rod 332, when the first top plate 321 moves along the mold opening direction, the first top plate 321 abuts on the top wall of the push-out groove 334 in the case that the second top plate 331 is not active, and the push rod 332 is driven to move along the mold opening direction together with the first top plate 321. The design of the movable groove reduces the case that only the straight top structure 32 works due to the first fault, and ensures that the push rod 332 can also work together in the case that only the first top plate 321 is active, thereby ensuring that the mold can be smoothly demolded in the case that only the first top plate 321 works.

[0039] With reference to Figure 5 Further comprising a reinforcing ejection structure 34, the reinforcing ejection structure 34 comprises a plurality of ejector pins 341, one end of the plurality of ejector pins 341 is fixed on the second top plate 331, and the other end of the ejector pin 341 is designed circumferentially on the lower mold 2, and the ejector pin 341 is located between the straight top structures 32 and is used for assisting the straight top structure 32 to eject the maintenance cover plate plastic part 7. The ejector pin 341 is added to further enhance the ejection effect of the maintenance cover plate plastic part 7.

[0040] With reference to Figures 2-3 The upper mold 1 and the lower mold 2 are further provided with a cooling pipe 6, and the cooling pipe 6 is used for accelerating product forming and is beneficial to improving production efficiency.

[0041] Of course, the above is only a typical example of the present application, in addition to this, the present application can have other various specific implementation manners, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A four-block ejection injection molding structure for a plastic access cover, comprising an upper mold (1), a lower mold (2) and an ejection mechanism (3), characterized in that, The ejection mechanism (3) comprises four core-pulling structures (31) and a straight ejection structure (32), the four core-pulling structures (31) are circumferentially arranged on the lower mold (2), the core-pulling structure (31) comprises a clamping block (311), an inclined guide column (312) and a spring (313), the clamping block (311) slides on the lower mold (2), the clamping block (311) is provided with an inclined hole (3111), the inclined hole (3111) is used for inserting the inclined guide column (312), the inclined guide column (312) is arranged on the upper mold (1), and the spring (313) is fixedly connected at both ends with the clamping block (311) and the lower mold (2), the spring (313) is always kept in a stretched state, when the mold is closed, the inclined guide column (312) is inserted into the inclined hole (3111) to drive the clamping block (311) to abut against the lower mold (2), and is used for jointly forming the clamping structure (71) with the lower mold (2), when the mold is opened, the inclined guide column (312) is pulled out, the spring (313) drives the clamping block (311) to move away from the lower mold (2), and the straight ejection structure (32) is used for ejecting the maintenance cover plastic part (7) in the opening direction.

2. The four-block ejection injection molding structure of the plastic cover plate according to claim 1, wherein, The straight ejection structure (32) comprises a first top plate (321) and a plurality of straight ejection columns (322), the first top plate (321) moves in the opening and closing direction, one end of the plurality of straight ejection columns (322) is arranged on the first top plate (321), the other end abuts against the bottom surface of the maintenance cover plastic part (7), and the plurality of straight ejection columns (322) are used for ejecting the maintenance cover plastic part (7) in the opening direction.

3. The four-block ejection injection molding structure of the plastic cover plate according to claim 1, wherein, The inclined angle of the inclined guide column (312) is between 15° and 25°, and the length of the inclined guide column (312) is greater than the length of the inclined hole (3111) of the clamping block (311).

4. The four-block ejection injection molding structure of the plastic cover plate according to claim 1, wherein, The limiting structure (5) further comprises a limiting block (51), the limiting block (51) is arranged on the side of the lower mold (2) close to the outer side, the limiting block (51) is used for limiting the movement distance of the clamping block (311) in the length direction of the spring (313), and the clamping block (311) is further provided with a relief groove (52) matched with the clamping block (311).

5. The four-block ejection injection molding structure of the plastic cover plate according to claim 1, wherein, The push plate structure (33) further comprises a second top plate (331) and a plurality of push rods (332), the second top plate (331) moves in the opening and closing direction, the second top plate (331) is located below the first top plate (321), one end of the plurality of push rods (332) is arranged on the second top plate (331), a top block (333) is further fixed on the push rod (332), the top block (333) abuts against the bottom surface of the maintenance cover plastic part (7), the top block (333) is located between the clamping blocks (311), and the top block (333) is used for jointly forming the side edge of the maintenance cover plastic part (7) with the lower mold (2).

6. The four-block ejection injection molding structure of the plastic cover plate according to claim 5, wherein, The push rod (332) is also provided with an ejection groove (334), the push rod (332) passes through the first top plate (321) through the ejection groove (334), the length direction of the ejection groove (334) is the same as that of the push rod (332), when the first top plate (321) moves in the mold opening direction, the first top plate (321) abuts on the top wall of the ejection groove (334) without the activity of the second top plate (331), and the push rod (332) is driven to move in the mold opening direction along with the first top plate (321).

7. The four-block ejection injection molding structure of the plastic cover plate according to claim 2, characterized in that, The reinforcing ejection structure (34) is also included, the reinforcing ejection structure (34) includes a plurality of ejector pins (341), one end of the plurality of ejector pins (341) is arranged on the second top plate (331), the other end of the ejector pins (341) is arranged in the circumferential direction on the lower mold (2), the ejector pins (341) are located between the straight ejection structures (32), and the ejector pins (341) are used for assisting the straight ejection structures (32) to eject the plastic part (7) of the maintenance cover plate.

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