Anti-blocking injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to an anti-blocking injection mold which comprises a lower mold body, an upper mold body provided with an upper mold cavity and a ventilation device, a ventilation cavity is formed in the upper mold cavity, a first ventilation hole is formed in the inner wall of the upper mold cavity, the first ventilation hole is communicated with the ventilation cavity, a second ventilation hole is formed in the inner wall of the ventilation cavity, and the second ventilation hole is communicated with the ventilation cavity. One end of the second vent hole communicates with the outer surface of the upper die body, the ventilation device is located in the ventilation cavity and comprises a transmission part, a trigger part in sliding connection with the inner wall of the ventilation cavity and a blocking part in sliding connection with the inner wall of the ventilation cavity, and when the first vent hole is in an open state, the trigger end of the trigger part extends into the upper die cavity. The triggering piece slides to drive the blocking piece to block the first vent hole through the transmission piece, and the quality problems that hot-melt plastic enters and blocks the first vent hole, so that a groove is not completely filled, and products are not formed or an internal cavity appears are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an anti-clogging injection mold. Background Art

[0002] During the use of the injection mold, the hot-melt plastic will squeeze the air inside the mold when entering the mold. If the air cannot be discharged, it will cause air to be trapped in the mold, resulting in incomplete filling of the mold cavity inside the mold, which may cause the product to be unformed or have internal cavities and other quality problems. Therefore, it is necessary to install a ventilation device on the mold. The existing ventilation method mostly adopts the method of opening vents at the mold closing point. Vents are provided at the connection between the upper mold body and the lower mold body and at the connection of some components. During the injection molding process, when the plastic enters the mold, it will squeeze the air and discharge the air from the vents.

[0003] However, in the existing technology, plastic will flow into the interior and gaps of the vents, causing the vents at the mold closing point and some component connections to be blocked by the cooled plastic after long-term use, making it impossible for the air inside the mold to be discharged in time, which will lead to incomplete filling of the mold cavity, the product being unformed or having internal cavities and other quality problems. Utility Model Content

[0004] One of the purposes of the present invention is to provide an anti-clogging injection mold to address the problem that the vent holes of an injection mold are easily clogged by plastic, so that the injected plastic is not easy to enter the vent holes, thereby avoiding clogging of the vent holes.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] Provided is an anti-clogging injection mold, comprising a lower mold body, an upper mold body provided with an injection port, and a ventilation device, wherein a lower mold cavity is provided inside the lower mold body, an upper mold cavity is provided inside the upper mold body, and when the lower mold body and the upper mold body are in a mold-clogging state, the lower mold cavity and the upper mold cavity surround a molding cavity, a plurality of ventilation cavities are provided inside the upper mold cavity, a first ventilation hole is provided on the inner wall of the upper mold cavity, the first ventilation hole is connected to the ventilation cavity, a second ventilation hole is provided on the inner wall of the ventilation cavity, one end of the second ventilation hole is connected to the outer surface of the upper mold body, and the ventilation device is located at the ventilation cavity. In the air cavity, the ventilation device includes a transmission part, a trigger part slidably connected to the inner wall of the ventilation cavity, and a blocking part slidably connected to the inner wall of the ventilation cavity. One end of the trigger part is a trigger end, and the other end is a transmission end. When the first air hole is in an open state, the trigger end of the trigger part extends into the upper mold cavity, and the transmission end of the trigger part is transmission-connected to the blocking part through the transmission part. The sliding of the trigger part will drive the blocking part to slide through the transmission part. When the trigger end of the trigger part is flush with the inner wall of the upper mold cavity, one end of the blocking part blocks the first air hole.

[0007] The utility model provides an anti-clogging injection mold, in which hot-melt plastic is injected into the mold cavity from the injection port. When the first vent hole is in a connected state, the hot-melt plastic squeezes the air in the mold cavity, causing the air to flow into the ventilation cavity from the first vent hole and then flow to the outside from the second vent hole, so that the air in the mold cavity is discharged. Since the trigger end of the trigger member is lower than the inner wall of the upper mold cavity, the hot-melt plastic will preferentially contact the trigger end and squeeze the trigger member, pushing the trigger member to slide on the inner wall of the vent cavity. The sliding of the trigger member will drive the sealing member to slide in the vent cavity through the transmission member. When the trigger end of the trigger member is flush with the inner wall of the upper mold cavity, one end of the sealing member blocks the first vent hole, and an air column is formed in the first vent hole. The air column will generate pressure on the hot-melt plastic to prevent the hot-melt plastic from entering the first vent hole, thereby preventing the hot-melt plastic from solidifying in the first vent hole and clogging the first vent hole, thereby preventing air from being trapped when the mold is used, causing incomplete filling of the mold groove inside the mold, resulting in quality problems such as product failure or internal cavity.

[0008] Furthermore, the trigger member includes a trigger rod and a trigger plate fixed to one end of the trigger rod, the trigger plate at least partially extending into the upper mold cavity and slidably connected to the inner wall of the vent cavity. The sealing member includes a sealing rod and a sealing head fixed to one end of the sealing rod, the other end of the sealing rod being connected to the transmission member, and the maximum cross-sectional area of ​​the sealing head being larger than the area of ​​the first vent. The trigger plate has a larger contact area with the hot-melt plastic, thereby better pushing the trigger plate. The maximum cross-sectional area of ​​the sealing head is larger than the area of ​​the first vent, thereby improving the sealing effect, forming an air column within the first vent, and preventing the hot-melt plastic from entering the first vent.

[0009] Furthermore, the transmission member includes a gear, and the trigger rod and the blocking rod are respectively provided with a first tooth portion and a second tooth portion, the first tooth portion and the second tooth portion respectively meshing with the gear. This gear transmission has high precision and small transmission error. When the bottom end of the trigger plate is flush with the inner wall of the upper mold cavity, the sealing head can accurately seal the first vent hole with greater accuracy.

[0010] Furthermore, the system includes a reset member disposed within the vent cavity, configured to restore the trigger end of the trigger plate to a position extending into the upper mold cavity. When the vent hole is closed, one end of the trigger plate is flush with the inner wall of the upper mold cavity. After mold separation, the reset member applies a force to the trigger plate to reset it, eliminating the need for manual reset of the trigger plate, facilitating the next injection molding cycle and providing increased convenience.

[0011] Furthermore, the device includes a fixed plate fixed to the inner wall of the vent cavity, and the reset member includes an elastic member, with both ends of the elastic member respectively abutting against the fixed plate and the trigger plate. The hot melt plastic squeezes the trigger plate, thereby compressing the elastic member. After mold separation, the trigger plate, under the action of the elastic member and the force member, pushes the trigger plate to reset, thereby resetting the vent hole to an open state.

[0012] Furthermore, the vent cavity further includes a blocking cavity connected to the first vent hole. The blocking cavity is truncated cone-shaped, with a smaller opening connected to the first vent hole. The sealing head is located within the blocking cavity. When the sealing head moves toward the first vent hole, a force is generated to squeeze the blocking cavity when the sealing head contacts the inner wall of the blocking cavity, causing the sealing head and the inner wall of the blocking cavity to tightly contact, thereby sealing the first vent hole.

[0013] Furthermore, a hollow sleeve is fixed to the inner wall of the ventilation cavity, and the hollow sleeve has a plurality of ventilation holes along its axial direction. The blocking rod is slidably connected to the hollow sleeve. The hollow sleeve can provide support for the blocking rod, and the squeezed air can enter the ventilation cavity through the ventilation holes of the hollow sleeve.

[0014] Furthermore, the sealing head is truncated cone-shaped, with the larger end surface of the sealing head connected to the blocking rod, and the axis of the blocking cavity and the axis of the sealing head are aligned. The inner walls of the sealing head and the blocking cavity are both truncated cone-shaped, which increases the contact surface between the sealing head and the inner wall of the blocking cavity and improves the sealing effect.

[0015] Furthermore, a sealing ring is provided on the outside of the sealing head. The sealing ring can be deformed when the sealing head is squeezed into the sealing cavity, thereby filling the gap between the sealing head and the sealing cavity, making the sealing head and the sealing cavity fit more tightly, achieving a better sealing effect, and better preventing hot melt plastic from entering the first vent hole and causing blockage.

[0016] Furthermore, a vent pipe is fixed to the inner wall of the second vent hole, and the vent pipe can be regularly removed for cleaning to prevent blockage.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model provides an anti-clogging injection mold,

[0019] 1. When the trigger part slides, it will drive the blocking part through the transmission part to block the first vent hole, preventing the hot-melt plastic from entering the first vent hole. This will prevent the hot-melt plastic from solidifying in the first vent hole and blocking the first vent hole. This will prevent air from being trapped during subsequent use, causing incomplete filling of the mold cavity inside the mold, resulting in product failure or internal cavities and other quality problems.

[0020] 2. The reset part will exert a force on the trigger plate to reset it, so there is no need to reset the trigger plate manually, which is convenient for the next injection molding and more convenient.

[0021] 3. The inner walls of the head and the sealing cavity are both truncated cone-shaped, which increases the contact surface between the head and the inner wall of the sealing cavity. A sealing ring is provided outside the head to achieve a better sealing effect and better prevent hot-melt plastic from entering the first vent hole and causing blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of an anti-clogging injection mold of the utility model;

[0023] Figure 2 for Figure 1 An enlarged view of position A;

[0024] Figure 3 Schematic diagram of the structure of the upper mold body;

[0025] Figure 4 Schematic diagram of the structure of the trigger rod;

[0026] Figure 5 Schematic diagram of the structure of the blocking rod.

[0027] In the accompanying drawings: 100, lower mold body; 110, lower mold cavity; 200, upper mold body; 210, injection port; 220, upper mold cavity; 230, first vent hole; 240, vent cavity; 241, fixing plate; 242, blocking cavity; 243, hollow sleeve; 250, second vent hole; 251, vent pipe; 300, ventilation device; 310, transmission member; 311, gear; 320, trigger member; 321, trigger rod; 322, trigger plate; 323, first tooth portion; 330, blocking member; 331, blocking rod; 332, head; 333, second tooth portion; 334, sealing ring; 400, reset member; 410, elastic member. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and so on indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] Example 1

[0031] This embodiment is a first embodiment of an anti-clogging injection mold, such as Figure 1-5As shown, it includes a lower mold body 100, a ventilation device 300 and an upper mold body 200 provided with an injection port 210, a lower mold cavity 110 is provided inside the lower mold body 100, and an upper mold cavity 220 is provided inside the upper mold body 200. When the lower mold body 100 and the upper mold body 200 are in the mold closing state, the lower mold cavity 110 and the upper mold cavity 220 surround the molding cavity, and a ventilation cavity 240 is provided inside the upper mold cavity 220. The ventilation device 300 is located in the ventilation cavity 240, and a first ventilation hole 230 is provided on the inner wall of the upper mold cavity 220. The first ventilation hole 230 is connected to the ventilation cavity 240, and a second ventilation hole 250 is provided on the inner wall of the ventilation cavity 240. One end of the second ventilation hole 250 is connected to the outer surface of the upper mold body 200, and the ventilation device 300 includes a transmission member 310 and a trigger member slidably connected to the inner wall of the ventilation cavity 240 320 and a sealing member 330 slidably connected to the inner wall of the ventilation cavity 240, the trigger member 320 includes a trigger rod 321, a first tooth portion 323 and a trigger plate 322 fixed at one end of the trigger rod 321, the trigger plate 322 at least partially extends into the upper mold cavity 220, the trigger plate 322 is slidably connected to the inner wall of the ventilation cavity 240, the sealing member 330 includes a sealing rod 331, a second tooth portion 333 and a head 332 fixed at one end of the sealing rod 331, the maximum cross-sectional area of ​​the head 332 is greater than the area of ​​the first ventilation hole 230, the transmission member 310 includes a gear 311, the first tooth portion 323 and the second tooth portion 333 are respectively engaged with the gear 311, when the trigger end of the trigger member 320 is flush with the inner wall of the upper mold cavity 220, one end of the sealing member 330 blocks the first ventilation hole 230.

[0032] The working principle of this embodiment is as follows: hot-melt plastic is injected into the mold cavity from the injection port 210. When the first vent hole 230 is in a connected state, the hot-melt plastic will squeeze the air in the mold cavity, causing the air to flow from the first vent hole 230 into the ventilation cavity 240, and then flow to the outside from the second vent hole 250, so that the air in the mold cavity is discharged. When the first tooth portion 323 is engaged with the gear 311, the second tooth portion 333 engaged with the gear 311 is driven to move, so that the sealing member 330 slides in the vent cavity 240. When the trigger end of the trigger plate 322 is flush with the inner wall of the upper mold cavity 220, the sealing head 332 blocks the first vent hole 230, and an air column is formed in the first vent hole 230. The air column exerts pressure on the hot-melt plastic to prevent the hot-melt plastic from entering the first vent hole 230, thereby preventing the hot-melt plastic from solidifying in the first vent hole 230 and blocking the first vent hole 230, thereby preventing air from being trapped when the mold is used, causing the mold cavity inside the mold to be incompletely filled, resulting in quality problems such as product failure or internal cavities.

[0033] The beneficial effects of this embodiment are as follows: the sliding of the trigger member 320 drives the blocking member 330 through the transmission member 310 to block the first vent 230, preventing the hot-melt plastic from entering the first vent 230, thereby preventing the hot-melt plastic from solidifying in the first vent 230 and blocking the first vent 230. This prevents air from being trapped during the next use, causing incomplete filling of the mold cavity inside the mold, resulting in product failure or internal cavity quality problems. The gear 311 has high transmission accuracy and small transmission error. When the bottom end of the trigger plate 322 is flush with the inner wall of the upper mold cavity 220, the sealing head 332 can accurately block the first vent 230, with better accuracy.

[0034] Another embodiment of the transmission member 310 is provided here. In this embodiment, the transmission member 310 is a rotating bar, the center of the rotating bar is rotatably connected to the inner wall of the ventilation cavity 240, one end of the trigger rod 321 is rotatably connected to one end of the rotating bar, and one end of the blocking rod 331 is rotatably connected to the other end of the rotating bar. When the trigger plate 322 is squeezed, the trigger rod 321 is displaced and drives the rotating plate to rotate. The other end of the rotating plate pushes the blocking rod 331 to move, so that the head 332 blocks the first ventilation hole 230.

[0035] In addition, the transmission method between the transmission member 310 and the trigger member 320 and the blocking member 330 can also be a worm gear transmission, a chain transmission, etc.

[0036] Example 2

[0037] This embodiment is a second embodiment of an anti-clogging injection mold. This embodiment is similar to the first embodiment, except that Figure 4 As shown, the mold further includes a reset member 400 disposed within the vent cavity 240. The reset member 400 is used to restore the trigger end of the trigger plate 322 to a state extending into the upper mold cavity 220. A fixing plate 241 is also included, fixed to the inner wall of the vent cavity 240. The reset member 400 includes an elastic member 410. In this embodiment, the elastic member 410 is a spring, which is wound around the outside of the trigger rod 321. The two ends of the spring respectively abut against the fixing plate 241 and the trigger plate 322.

[0038] The working principle of this embodiment is as follows: the hot melt plastic squeezes the trigger plate 322 to move and compresses the spring together with the fixed plate 241. When the mold is separated, the trigger plate 322 is pushed back to its original position under the action of the spring force, and the first vent 230 is converted to the open state. There is no need to manually reset the trigger plate 322, which is convenient for the next injection molding.

[0039] Another embodiment of the reset member 400 is provided herein. In this embodiment, the reset member 400 is a manual rod, one end of which is fixedly connected to the blocking rod 331. The manual rod extends outside the upper mold cavity 220. The operator can reset the trigger plate 322 by pushing the manual rod.

[0040] Example 3

[0041] This embodiment is a third embodiment of an anti-clogging injection mold. This embodiment is similar to the first and second embodiments, except that: Figure 2 and Figure 3 As shown, the ventilation cavity 240 also includes a blocking cavity 242 connected to the first ventilation hole 230. The blocking cavity 242 is truncated. The small opening of the blocking cavity 242 is connected to the first ventilation hole 230. The head 332 is located in the blocking cavity 242. A hollow sleeve 243 is fixed to the inner wall of the ventilation cavity 240. The head 332 is located between the hollow sleeve 243 and the first ventilation hole 230. The hollow sleeve 243 has a plurality of holes along its axial direction. The air hole, the sealing rod 331 is slidingly connected to the hollow sleeve 243, the head 332 is truncated cone-shaped, the end face of the head 332 with a larger area is connected to the sealing rod 331, the axis of the sealing cavity 242 and the axis of the head 332 are located on the same straight line, the taper of the truncated cone formed by the inner wall of the sealing cavity 242 is slightly larger than the taper of the head 332, and a sealing ring 334 is provided on the outside of the head 332, and a ventilation pipe 251 is fixed to the inner wall of the second air hole 250.

[0042] The working principle of this embodiment is as follows: the head 332 moves toward the first air vent 230, and when the head 332 contacts the inner wall of the sealing cavity 242, a force will be generated to squeeze the sealing cavity 242, so that the head 332 and the inner wall of the sealing cavity 242 are in close contact, and the sealing ring 334 will be deformed due to the extrusion, filling the gap between the head 332 and the sealing cavity 242, thereby achieving the blocking of the first air vent 230. The taper of the blocking cavity 242 is slightly larger than the taper of the head 332, which increases the contact area between the head 332 and the blocking cavity 242, making the sealing effect better. The hollow sleeve 243 can provide support for the blocking rod 331, and the squeezed air can enter the ventilation cavity 240 from the air vent passing through the hollow sleeve 243. The ventilation pipe 251 can be removed and cleaned regularly to prevent blockage.

[0043] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An anti-clogging injection mold, comprising a lower mold body (100) and an upper mold body (200) provided with an injection port (210), wherein a lower mold cavity (110) is provided inside the lower mold body (100), and an upper mold cavity (220) is provided inside the upper mold body (200), and when the lower mold body (100) and the upper mold body (200) are in a mold-clamping state, the lower mold cavity (110) and the upper mold cavity (220) enclose a molding cavity, characterized in that: The upper mold cavity (220) further comprises a ventilation device (300), wherein a plurality of ventilation cavities (240) are provided inside the upper mold cavity (220), a first ventilation hole (230) is provided on the inner wall of the upper mold cavity (220), the first ventilation hole (230) is communicated with the ventilation cavity (240), a second ventilation hole (250) is provided on the inner wall of the ventilation cavity (240), one end of the second ventilation hole (250) is communicated with the outer surface of the upper mold body (200), the ventilation device (300) is located in the ventilation cavity (240), and the ventilation device (300) comprises a transmission member (310), a trigger member (320) slidably connected to the inner wall of the ventilation cavity (240), and a trigger member (320) slidably connected to the inner wall of the ventilation cavity (240). The sealing member (330) is slidably connected to the inner wall of the upper mold cavity (220), one end of the trigger member (320) is a trigger end, and the other end is a transmission end. When the first vent hole (230) is in an open state, the trigger end of the trigger member (320) extends into the upper mold cavity (220), and the transmission end of the trigger member (320) is transmission-connected to the sealing member (330) through the transmission member (310). When the trigger member (320) slides, the sealing member (330) is driven to slide through the transmission member (310). When the trigger end of the trigger member (320) is flush with the inner wall of the upper mold cavity (220), one end of the sealing member (330) blocks the first vent hole (230).

2. The anti-clogging injection mold according to claim 1, characterized in that: The trigger member (320) includes a trigger rod (321) and a trigger plate (322) fixed at one end of the trigger rod (321), the trigger plate (322) at least partially extends into the upper mold cavity (220), and the trigger plate (322) is slidably connected to the inner wall of the ventilation cavity (240). The blocking member (330) includes a blocking rod (331) and a head (332) fixed at one end of the blocking rod (331), the other end of the blocking rod (331) is connected to the transmission member (310), and the maximum cross-sectional area of ​​the head (332) is greater than the area of ​​the first ventilation hole (230).

3. The anti-clogging injection mold according to claim 2, characterized in that: The transmission member (310) comprises a gear (311), and the trigger rod (321) and the blocking rod (331) are respectively provided with a first tooth portion (323) and a second tooth portion (333), and the first tooth portion (323) and the second tooth portion (333) are respectively engaged with the gear (311).

4. The anti-clogging injection mold according to claim 2, characterized in that: It also includes a reset member (400) disposed in the vent cavity (240), the reset member (400) being used to restore the trigger end of the trigger plate (322) to a state of extending into the upper mold cavity (220).

5. The anti-clogging injection mold according to claim 4, characterized in that: It also includes a fixing plate (241) fixed to the inner wall of the ventilation cavity (240), and the reset member (400) includes an elastic member (410), and two ends of the elastic member (410) respectively abut against the fixing plate (241) and the trigger plate (322).

6. The anti-clogging injection mold according to claim 2, characterized in that: The ventilation cavity (240) further comprises a blocking cavity (242) in communication with the first ventilation hole (230); the blocking cavity (242) is truncated cone-shaped; a small opening of the blocking cavity (242) is in communication with the first ventilation hole (230); and the sealing head (332) is located in the blocking cavity (242).

7. The anti-clogging injection mold according to claim 6, characterized in that: A hollow sliding sleeve (243) is also fixed to the inner wall of the ventilation cavity (240), the sealing head (332) is located between the hollow sliding sleeve (243) and the first ventilation hole (230), the hollow sliding sleeve (243) is provided with a plurality of ventilation holes along its axial direction, and the blocking rod (331) is slidably connected to the hollow sliding sleeve (243).

8. The anti-clogging injection mold according to claim 6, characterized in that: The sealing head (332) is truncated cone-shaped, and the end face with a larger area of ​​the sealing head (332) is connected to the blocking rod (331), and the axis of the blocking cavity (242) and the axis of the sealing head (332) are located on the same straight line.

9. The anti-clogging injection mold according to claim 8, characterized in that: A sealing ring (334) is provided on the outside of the sealing head (332).

10. An anti-clogging injection mold according to any one of claims 1 to 7, characterized in that: A ventilation tube (251) is fixed to the inner wall of the second ventilation hole (250).

Images