An injection mold that facilitates demolding

Abstract

This invention discloses an injection mold that facilitates demolding, belonging to the field of injection mold technology. The injection mold for easy demolding includes a supporting guide pillar, and further includes: an upper mold base, disposed on top of the supporting guide pillar, with an upper mold plate at the bottom of the upper mold base; an auxiliary guide rod connected to the bottom of the upper mold plate; a lower mold plate sleeved on the bottom of the auxiliary guide rod; and a lower mold base connected to the bottom of the lower mold plate; an in-mold spraying structure disposed on the outside of the upper mold plate, wherein the in-mold spraying structure includes a transverse support fixed to one side of the upper mold plate, a movable plate sleeved inside the transverse support, a paint nozzle installed on the outside of the movable plate, and a feeding hose installed on the outside of the paint nozzle inlet; this invention eliminates internal stress and prevents product deformation through gas-assisted injection molding, and the cooperative design of the locking wheel and vertical toothed seat ensures that the square support plate can be firmly locked after being raised and lowered to the correct position, preventing movement due to external forces, thereby improving demolding stability.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to an injection mold that is easy to demold. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding include high production speed and efficiency, automated operation, a wide variety of designs and shapes (from simple to complex), and sizes ranging from large to small. It also produces dimensionally accurate products, facilitates product updates and replacements, and can create complex shapes. Injection molding is suitable for mass production and molding processes involving complex shapes.

[0003] A search revealed a Chinese patent application, CN118144214B, which discloses a mobile phone case injection mold for easy demolding. When the end of the L-shaped limiting plate contacts the moving mold, as the distance between the mounting plate and the moving mold continues to decrease, the mounting plate will contact the drive plate (due to the presence of a third spring, the third spring will gradually be compressed and shortened). Due to the cooperation of the drive column and guide groove, the drive plate begins to move along the inclined portion. When the moving mold and the fixed mold are closed, the mounting plate does not contact the sliding sleeve and the drive plate, ensuring that the drive plate resets under the action of the third spring, and that the sliding rod and mold core reset under the action of the first and second springs. Two demolding hooks are provided at the same end of the drive plate, and the two demolding hooks are set at an angle to facilitate the removal of the mobile phone case injection molded part from the mold core.

[0004] The aforementioned patent still has the following shortcomings: For injection molding of carbon fiber materials, due to the complex interfacial stress of carbon fiber materials, a chemical reaction will occur with the mold material during the molding process, resulting in adhesion. Traditional devices generally use a release agent in advance, which functions to separate the mold from the finished product. However, release agents containing acidic components increase the viscosity of the mixture when reacting with alkaline fillers, affecting the demolding effect. Uneven coating may lead to demolding difficulties or even damage to the material and mold. Furthermore, this device installs a lifting device outside the lower mold plate during demolding. The lower end of the mold has a small force range, and there is no relevant auxiliary support to distribute the weight of the molded product and the mold, which fails to reduce the pressure of the lifting device on the molded product, thereby increasing the damage to the finished product. Summary of the Invention

[0005] The purpose of this invention is to solve the problems that uneven application of release agent may lead to demolding difficulties, and that when a lifting device is installed outside the lower mold plate during demolding, the lower end of the mold has a small force range and no related auxiliary support is provided to distribute the weight of the molded product and the mold, thus failing to reduce the pressure of the lifting device on the molded product and increasing the damage to the finished product. Therefore, this invention proposes an injection mold that facilitates demolding.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An injection mold for easy demolding includes support guide pillars and further includes:

[0008] An upper mold base is set on top of a support guide column, and an upper template is also set at the bottom of the upper mold base. An auxiliary guide rod is connected to the bottom of the upper template, and a lower template is sleeved at the bottom of the auxiliary guide rod. The bottom of the lower template is connected to a lower mold base.

[0009] An in-mold spraying structure is set on the outside of the upper template. The in-mold spraying structure includes a transverse support fixed to one side of the upper template, a movable plate sleeved on the inside of the transverse support, a paint nozzle installed on the outside of the movable plate, a feeding hose installed on the outside of the paint nozzle inlet, and a drive assembly sleeved on the inside of the transverse support.

[0010] A ventilation structure, located inside the lower template, is used to assist in vertical upward airflow onto the molded product.

[0011] The lifting structure, located inside the lower template and on both sides of the ventilation structure, is used to lift the two ends of the molded product vertically upwards.

[0012] A protruding insert is fixedly connected to the top of the lower template. One side of the protruding insert is provided with a slot that is embedded inside the lower template and connected to an auxiliary guide rod. One side of the slot is provided with a square support plate that is slidably connected to the lower template. The square support plates are symmetrically installed on the inner side of the lower template.

[0013] The drive assembly includes a small motor mounted on the outside of the transverse support, a threaded rod mounted on the outside of the output end of the small motor, and a linear shaft mounted on both sides of the threaded rod and connected to the transverse support.

[0014] The lifting structure includes a DC motor installed on the outside of the lower template, a rotating shaft installed on the outside of the DC motor output end, a bidirectional thread sleeved on the outside of the rotating shaft, a movable plate installed on the outside of the bidirectional thread sleeve, a rack seat sleeved on the top of the movable plate, a transmission gear meshing on the rack seat, a locking wheel installed on the outside of the transmission gear, a vertical gear seat meshing on the tooth grooves of the two sets of locking wheels and connected to the square support plate, and a limiting component installed on the other side of the transmission gear.

[0015] As a preferred technical solution of this application, the ventilation structure includes a ventilation pipe installed on the outside of the lower template and located in the middle of the two sets of DC motors, a branch pipe installed at the end of the ventilation pipe and fixedly connected to the inside of the lower template, and an air outlet installed on the top of the branch pipe and horizontal to the groove surface of the lower template.

[0016] As a preferred technical solution of this application, the limiting component includes a limiting plate installed on the side of the transmission gear away from the locking wheel and a tension spring installed in the gap between the two sets of limiting plates.

[0017] As a preferred technical solution of this application, the bidirectional threads are symmetrically distributed on the outside of the rotating shaft, the thread surface of the bidirectional threads and the interior of the movable plate form a lead screw structure, and the bidirectional threads are installed below the groove of the lower template.

[0018] As a preferred technical solution of this application, the limiting plates are evenly distributed on both sides of the vertical tooth seat, and the bottom of the limiting plates is inserted into one side of the movable plate and slidably engaged with the inner surface of the movable plate.

[0019] As a preferred technical solution of this application, the transmission gears are evenly distributed on both sides of the vertical gear seat, and the top of the outer teeth of the transmission gears does not contact the bottom surface of the groove of the lower template.

[0020] As a preferred technical solution of this application, the movable plates are symmetrically arranged on the outside of the bidirectional threads, and the movable plates form a meshing transmission structure with the transmission gear through the rack seat.

[0021] As a preferred technical solution of this application, the air outlets are symmetrically distributed on the top of the groove surface of the lower template, and the outer edge of the air outlet head is opened with a smooth rounded corner structure.

[0022] Compared with the prior art, the present invention provides an injection mold that is easy to demold, and has the following beneficial effects:

[0023] 1. This injection mold facilitates demolding. The in-mold spraying structure of this device provides a stable and easily adjustable support platform for the paint nozzle through a horizontal bracket fixed on one side of the upper template. Polyimide is introduced into the paint nozzle through a feeding hose, ensuring that the paint nozzle can accurately align with the target area in the groove of the lower template. This avoids the problems of increased viscosity and demolding difficulties caused by the reaction of acidic release agents with alkaline fillers in traditional devices.

[0024] 2. This injection mold facilitates demolding. The device uses a DC motor to drive the rotating shaft, and combined with a bidirectional threaded design and a movable plate, it achieves smooth lifting and lowering of the square support plate. This mechanical transmission method is more efficient and stable than traditional methods, ensuring the accuracy and reliability of the lifting process. The locking wheel and vertical gear design ensure that the square support plate is firmly locked after being lifted into position, preventing movement due to external forces, thereby improving demolding stability.

[0025] 3. This easy-to-demold injection mold, this device connects the upper and lower mold plates to the outside of the air pipe by connecting a high-pressure inert gas pipe, presses and fixes them together, gas-assisted injection can eliminate internal stress and prevent product deformation, and during the demolding process, high-pressure gas can continue to be introduced to assist the two side square support plates to complete the lifting, reduce the pressure of the square support plates, and further prevent product deformation.

[0026] 4. This injection mold facilitates demolding. This device also reduces the need for mold release agents. Mold release agents containing acidic components increase the viscosity of the mixture when reacting with alkaline fillers, affecting the demolding effect. This device can avoid damage to the mold and molded products that may be caused by uneven application of mold release agent. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an injection mold that facilitates demolding, as proposed in this invention.

[0028] Figure 2 This is a schematic diagram of the upper mold base and upper template structure of an injection mold that facilitates demolding, as proposed in this invention.

[0029] Figure 3 This is a diagram illustrating the pressing effect of the upper and lower mold plates of an injection mold that facilitates demolding, as proposed in this invention.

[0030] Figure 4 This is a schematic diagram of the upper template of an injection mold that facilitates demolding, as proposed in this invention.

[0031] Figure 5 This is a cross-sectional view of the inner side of the lower mold plate of an injection mold that facilitates demolding, as proposed in this invention.

[0032] Figure 6 This is a schematic diagram of a ventilation structure for an injection mold that facilitates demolding, as proposed in this invention.

[0033] Figure 7 This is a schematic diagram of a lifting structure for an injection mold that facilitates demolding, as proposed in this invention.

[0034] Figure 8 This is a schematic diagram of the structure of an injection mold limiting component that facilitates demolding, as proposed in this invention.

[0035] Figure 9 This invention provides an injection mold that facilitates demolding. Figure 7 A schematic diagram of the structure of part A;

[0036] Figure 10 This is a schematic diagram of an in-mold spraying structure for an injection mold that facilitates demolding, as proposed in this invention.

[0037] In the picture:

[0038] 1. Support guide pillar; 2. Upper mold base; 21. Upper template; 22. Auxiliary guide rod; 23. Lower template; 24. Lower mold base; 3. In-mold spraying structure; 301. Horizontal support; 302. Moving plate; 303. Paint nozzle; 304. Feed hose; 305. Small motor; 306. Threaded rod; 307. Linear shaft; 4. Ventilation structure; 41. Vent pipe; 42. Branch pipe; 43. Air outlet; 5. Lifting structure; 501. DC motor; 502. Rotating shaft; 503. Bidirectional thread; 504. Movable plate; 505. Rack seat; 506. Transmission gear; 507. Locking wheel; 508. Vertical gear seat; 6. Protruding insert; 61. Slot; 62. Square support plate; 7. Limiting assembly; 71. Limiting plate; 72. Tension spring; 100. Guide groove; 101. Square groove; 102. Threaded hole; 103. Connecting rod; 104. Injection port. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Example:

[0041] Reference Figure 1-4 and Figure 10 An injection mold for easy demolding includes a support guide post 1, and further includes:

[0042] The upper mold base 2 is set on top of the support guide post 1, and the bottom of the upper mold base 2 is also provided with an upper template 21. The bottom of the upper template 21 is connected to an auxiliary guide rod 22, the bottom of the auxiliary guide rod 22 is sleeved with a lower template 23, and the bottom of the lower template 23 is connected to a lower mold base 24. The auxiliary guide rod 22 cooperates with the support guide post 1 to facilitate the stable connection between the upper template 21 and the lower template 23.

[0043] The in-mold spraying structure 3 is disposed on the outside of the upper template 21. The in-mold spraying structure 3 includes a transverse support 301 fixed to one side of the upper template 21, a movable plate 302 sleeved inside the transverse support 301, a paint nozzle 303 installed on the outside of the movable plate 302, a feeding hose 304 installed on the outside of the feed port of the paint nozzle 303, and a drive assembly sleeved inside the transverse support 301. By introducing polyimide into the paint nozzle 303, the paint nozzle 303 can be accurately aligned with the target area in the groove of the lower template 23.

[0044] Ventilation structure 4 is set inside the lower template 23 to assist in vertical upward air jetting of the molded product; the ventilation structure jets air above the groove of the lower template 23 so as to assist the lifting structure 5 in lifting the molded product upward simultaneously.

[0045] The lifting structure 5 is set inside the lower template 23 and located on both sides of the ventilation structure 4. It is used to lift the two ends of the molded product vertically upward. By applying an upward thrust to the two ends of the molded product, it works in conjunction with the ventilation structure 4 to facilitate the lifting of the molded product and prevent deformation.

[0046] A protruding insert 6 is fixedly connected to the top of the lower template 23. A slot 61 is provided on one side of the protruding insert 6, which is embedded in the lower template 23 and connected to the auxiliary guide rod 22. A square support plate 62 is provided on one side of the slot 61, which is slidably connected to the lower template 23. The square support plates 62 are symmetrically installed on the inner side of the lower template 23. By inserting the protruding insert 6 of the lower template 23 into the square groove 101 of the upper template 21, the slot 61 of the lower template 23 is connected to the auxiliary guide rod 22 of the upper template 21, so as to facilitate a stable connection between the upper template 21 and the lower template 23.

[0047] The drive assembly includes a small motor 305 mounted on the outside of the transverse support 301, a threaded rod 306 mounted on the outside of the output end of the small motor 305, and a linear shaft 307 mounted on both sides of the threaded rod 306 and connected to the transverse support 301. The small motor 305 drives the threaded rod 306, which in turn drives the moving plate 302, so that the paint nozzle 303 can move back and forth inside the transverse support 301 and stably spray polyimide onto the outer wall of the groove of the template 23.

[0048] The lifting structure 5 includes a DC motor 501 installed on the outside of the lower template 23, a rotating shaft 502 installed on the outside of the output end of the DC motor 501, a bidirectional thread 503 sleeved on the outside of the rotating shaft 502, a movable plate 504 installed on the outside of the bidirectional thread 503, a rack seat 505 sleeved on the top of the movable plate 504, a transmission gear 506 meshing above the rack seat 505, a locking wheel 507 installed on the outside of the transmission gear 506, a vertical gear seat 508 meshing in the tooth grooves of the two sets of locking wheels 507 and connected to the square support plate 62, and a limiting component 7 installed on the other side of the transmission gear 506. The DC motor 501 drives the bidirectional thread 503, which in turn drives the two movable plates 504 to open and close synchronously, so that the vertical gear seat 508 meshed by the locking wheel 507 can be lifted stably.

[0049] like Figure 5 and Figure 6As shown, in one embodiment: the ventilation structure 4 includes a ventilation pipe 41 installed on the outside of the lower template 23 and located in the middle of the two sets of DC motors 501, a branch pipe 42 installed at the end of the ventilation pipe 41 and fixedly connected inside the lower template 23, and an air outlet 43 installed on the top of the branch pipe 42 and horizontal to the groove surface of the lower template 23; by connecting a high-pressure inert gas pipe to the outside of the ventilation pipe 41, the upper template 21 and the lower template 23 are pressed and fixed together. Gas-assisted injection molding can eliminate internal stress and prevent product deformation. In addition, during the demolding process, high-pressure gas can continue to be introduced to assist the two side square support plates 62 to complete the lifting, reduce the pressure of the square support plates 62, and further prevent product deformation.

[0050] like Figure 8 As shown, in one embodiment: the limiting assembly 7 includes a limiting plate 71 installed on the side of the transmission gear 506 away from the locking wheel 507, and a tension spring 72 installed in the gap between the two sets of limiting plates 71; the tension spring 72 pulls the limiting plates 71 on both sides so that when the movable plate 504 moves, the two sets of limiting plates 71 do not move with the movable plate 504, and are converted into the lifting and lowering of the vertical rack seat 508 by meshing with the rack seat 505.

[0051] like Figure 5 As shown, in one embodiment: the bidirectional threads 503 are symmetrically distributed on the outside of the rotating shaft 502, the thread surface of the bidirectional threads 503 and the interior of the movable plate 504 form a screw structure, and the bidirectional threads 503 are installed below the groove of the lower template 23.

[0052] like Figure 7 and Figure 8 As shown, in one embodiment: the limiting plates 71 are evenly distributed on both sides of the vertical tooth seat 508, and the bottom of the limiting plates 71 is inserted into one side of the movable plate 504 and slidably engaged with the inner surface of the movable plate 504.

[0053] like Figure 9 As shown, in one embodiment: the transmission gears 506 are evenly distributed on both sides of the vertical gear seat 508, and the top of the outer teeth of the transmission gears 506 do not contact the bottom surface of the groove of the lower template 23.

[0054] like Figure 7 As shown, in one embodiment: the movable plate 504 is symmetrically arranged on the outside of the bidirectional thread 503, and the movable plate 504 forms a meshing transmission structure with the transmission gear 506 through the rack seat 505.

[0055] like Figure 6 As shown, in one embodiment: the air outlets 43 are symmetrically distributed on the top of the groove surface of the lower template 23, and the outer edge of the air outlet 43 is opened with a smooth rounded corner structure.

[0056] Specifically, when using an injection mold that facilitates demolding: First, insert the guide groove 100 of the upper mold base 2 into the support guide post 1, and ensure that the upper mold plate 21 and the lower mold plate 23 are stably connected through the auxiliary guide rod 22 and the protruding insert 6. Then, start the small motor 305, and cooperate with the moving plate 302 sleeved outside the connecting rod 103 through the threaded rod 306 to align the paint spray nozzle 303 of the in-mold spraying structure 3 with the target area of ​​the groove of the lower mold plate 23, in preparation for spraying. During operation, the small motor 305 of the in-mold spraying structure 3 is started, driving the threaded rod 306 to rotate, which in turn drives the moving plate 302 and the paint nozzle 303 to move back and forth inside the transverse support 301. The paint nozzle 303 receives polyimide paint through the feeding hose 304 and sprays it precisely onto the outer wall of the groove of the lower template 23 to enhance the bonding force between the mold and the molded product. In the closed state of the mold, the injection molding operation is carried out, and the molten plastic is injected into the mold groove through the injection port 104. At the same time, the ventilation structure 4 sprays air above the mold groove through the ventilation pipe 41 and the branch pipe 42 to assist the injection molding process and eliminate internal stress. After the injection molding is completed, the DC motor 501 of the lifting structure 5 is started, driving the rotating shaft 502 and the bidirectional thread 503 to rotate. The bidirectional thread 503 drives the two movable plates 504 to open and close synchronously through the built-in threaded hole 102 of the movable plate 504. This, in turn, drives the vertical gear seat 508 to be stably lifted through components such as the rack seat 505, transmission gear 506, and locking wheel. Simultaneously, during the injection molding process and before demolding, air is sprayed into the mold groove through the vent pipe 41 and the branch pipe 42. The venting structure 4 continues to spray air, assisting the two side square support plates 62 in completing the lifting action, reducing the pressure on the square support plates 62 and preventing product deformation. Under the combined action of the lifting structure 5 and the venting structure 4, the molded product is successfully lifted and removed from the mold. At this point, the molded product can be removed from the mold manually or automatically for subsequent processing.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An injection mold for easy demolding, comprising a support guide post (1), characterized in that, Also includes: The upper mold base (2) is set on the top of the support guide column (1), and the bottom of the upper mold base (2) is also provided with an upper template (21). The bottom of the upper template (21) is connected to an auxiliary guide rod (22), the bottom of the auxiliary guide rod (22) is sleeved with a lower template (23), and the bottom of the lower template (23) is connected to a lower mold base (24). The in-mold spraying structure (3) is set on the outside of the upper template (21). The in-mold spraying structure (3) includes a transverse support (301) fixed on one side of the upper template (21), a movable plate (302) sleeved on the inside of the transverse support (301), a paint nozzle (303) installed on the outside of the movable plate (302), a feeding hose (304) installed on the outside of the feed port of the paint nozzle (303), and a drive assembly sleeved on the inside of the transverse support (301). Ventilation structure (4) is set inside the lower template (23) to assist in vertical upward air jetting of the molded product; The lifting structure (5) is set inside the lower template (23) and located on both sides of the ventilation structure (4) to lift the two ends of the molded product vertically upward. A protruding insert (6) is fixedly connected to the top of the lower template (23). One side of the protruding insert (6) is provided with a slot (61) embedded in the lower template (23) and connected to the auxiliary guide rod (22). One side of the slot (61) is provided with a square support plate (62) that is slidably connected to the lower template (23). The square support plate (62) is symmetrically installed on the inner side of the lower template (23). The drive assembly includes a small motor (305) mounted on the outside of the transverse support (301), a threaded rod (306) mounted on the outside of the output end of the small motor (305), and a linear shaft (307) mounted on both sides of the threaded rod (306) and connected to the transverse support (301). The lifting structure (5) includes a DC motor (501) installed on the outside of the lower template (23), a rotating shaft (502) installed on the outside of the output end of the DC motor (501), a bidirectional thread (503) sleeved on the outside of the rotating shaft (502), a movable plate (504) installed on the outside of the bidirectional thread (503), a rack seat (505) sleeved on the top of the movable plate (504), a transmission gear (506) meshing on the rack seat (505), a locking wheel (507) installed on the outside of the transmission gear (506), a vertical gear seat (508) meshing on the tooth grooves of the two sets of locking wheels (507) and connected to the square support plate (62), and a limiting component (7) installed on the other side of the transmission gear (506).

2. The injection mold for easy demolding according to claim 1, characterized in that, The ventilation structure (4) includes a ventilation pipe (41) installed on the outside of the lower template (23) and located in the middle of the two sets of DC motors (501), a branch pipe (42) installed at the end of the ventilation pipe (41) and fixedly connected inside the lower template (23), and an air outlet (43) installed on the top of the branch pipe (42) and level with the groove surface of the lower template (23).

3. The injection mold for easy demolding according to claim 1, characterized in that, The limiting assembly (7) includes a limiting plate (71) installed on the side of the transmission gear (506) away from the locking wheel (507) and a tension spring (72) installed in the gap between the two sets of limiting plates (71).

4. The injection mold for easy demolding according to claim 1, characterized in that, The bidirectional threads (503) are symmetrically distributed on the outside of the rotating shaft (502). The thread surface of the bidirectional threads (503) and the interior of the movable plate (504) form a screw structure. The bidirectional threads (503) are installed below the groove of the lower template (23).

5. The injection mold for easy demolding according to claim 3, characterized in that, The limiting plates (71) are evenly distributed on both sides of the vertical toothed seat (508). The bottom of the limiting plates (71) is inserted into one side of the movable plate (504) and slidably engaged with the inner surface of the movable plate (504).

6. The injection mold for easy demolding according to claim 1, characterized in that, The transmission gears (506) are evenly distributed on both sides of the vertical gear seat (508), and the top of the outer teeth of the transmission gears (506) do not contact the bottom surface of the groove of the lower template (23).

7. The injection mold for easy demolding according to claim 1, characterized in that, The movable plate (504) is symmetrically arranged on the outside of the bidirectional thread (503), and the movable plate (504) forms a meshing transmission structure with the transmission gear (506) through the rack seat (505).

8. The injection mold for easy demolding according to claim 2, characterized in that, The air outlets (43) are symmetrically distributed on the top of the groove surface of the lower template (23), and the outer edge of the air outlet (43) is opened with a smooth rounded corner structure.

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