An injection mold for a plastic storage box

Abstract

The present invention relates to a plastic storage box mold, in particular to an injection mold for a plastic storage box. During injection molding, the moving template presses towards the fixed template, and the mold core and the mold cavity can cooperate to form a cavity for injection molding. After the injection molding is completed, the moving template is removed to perform demolding. During demolding, in this application, gas is introduced through the air inlet and the air jacking groove, gas circulation is formed at the annular air channel on the positioning plate, and the gas is evenly discharged onto the product through the honeycomb micropores. The honeycomb micropores can make the air pressure evenly distributed and sprayed onto the product, thereby forming an air jacking for the product after injection molding, enabling the product to be smoothly ejected, thus reducing the situation of product damage and effectively improving the product quality.

Description

Technical Field

[0001] The present invention relates to a plastic storage box mold, and more particularly to an injection mold for a plastic storage box. Background Art

[0002] As an important tool for producing plastic products, injection molds are widely used in industries such as automotive, electronics, and packaging. It can not only endow plastic products with complete structures and precise dimensions, but also achieve mass production and high-efficiency manufacturing. However, with the continuous growth of market demand and the requirements of technological progress, the design and use of injection molds also face many challenges, especially the increasing urgency of improving product quality and reducing costs.

[0003] During the injection molding process, in order to ensure the smooth ejection of products, various methods are usually used to assist demolding. Common methods include manual ejection and mechanical ejector pins. Among them, manual ejection requires manual intervention, which is time-consuming and laborious. Although mechanical ejector pins can automatically complete the ejection action, they are prone to damage the product during the ejection process, which is likely to affect product quality. Scratches and friction on the surface of this kind of storage box with a slope can easily affect sales. Summary of the Invention

[0004] To solve the problem that although mechanical ejector pins can automatically complete the ejection action during demolding in the prior art, they are prone to damage the product during the ejection process and are likely to affect product quality, the present application provides an injection mold for a plastic storage box, and the specific scheme is as follows.

[0005] An injection mold for a plastic storage box includes a bottom plate, a positioning plate is arranged on the bottom plate, the positioning plate is fixedly connected to the bottom plate, a fixed mold plate is arranged on the positioning plate, the fixed mold plate is fixedly connected to the positioning plate, a movable mold plate is arranged on the side of the fixed mold plate away from the positioning plate, a mold cavity is opened on the fixed mold plate, a mold core is arranged on the movable mold plate, the mold core corresponds to the mold cavity of the fixed mold plate, and when the fixed mold plate abuts against the movable mold plate, the mold core is embedded in the mold cavity to form a cavity;

[0006] An injection port and an air port are opened on the bottom plate, an injection device is arranged on the positioning plate, one side of the injection device is arranged corresponding to the position of the injection port and is externally connected at the injection port, and the other side of the injection device extends into the mold cavity and is used for injection molding. An air ejection groove is arranged on the positioning plate corresponding to the air port, one side of the air ejection groove is communicated with the air port, the other side of the air ejection groove is communicated with the mold cavity, a blocking block for blocking the air ejection groove is arranged in the air ejection groove, a storage groove is also opened beside the air ejection groove, the storage groove is arranged corresponding to the shape of the blocking block, the storage groove is communicated with the air ejection groove, and an electromagnetic valve for driving the blocking block to move is also arranged on the positioning plate;

[0007] An annular air channel is provided in the fixed template corresponding to the air jacking groove. The annular air channel surrounds the mold core and is arranged corresponding to the shape of the product. The annular air channel is communicated with the air jacking groove. A plurality of honeycomb micropores are also provided on the fixed template corresponding to the annular air channel. The honeycomb micropores are arranged along the annular air channel. One side of the honeycomb micropore is communicated with the annular air channel and the other side is communicated with the mold cavity.

[0008] By adopting the above technical solutions, during injection molding, the moving template presses towards the fixed template, and the mold core and the mold cavity can cooperate to form a cavity for injection molding. After the injection molding is completed, the moving template can be removed to perform demolding. By setting the air inlet and the air jacking groove to introduce gas, gas circulation can be formed at the annular air channel, and the gas can be evenly discharged to the product through the honeycomb micropores, so that the air pressure distribution is uniform, forming an air jacking for the product after injection molding, and the product can be smoothly ejected, thereby reducing the situation of product damage and effectively improving the product quality.

[0009] Optionally, a pressure sensor and a timing controller are further arranged in the air jacking groove. The pressure sensor is used to detect the air pressure in the air jacking groove. The timing controller is connected to an external air pipe. The timing controller controls the external air pipe to inject low-pressure air flow instantaneously when the mold is opened and stepwise boost the pressure to 1 MPa at a gradient less than 0.1 MPa / 50 ms. When the pressure sensor detects that the air pressure is 1 MPa, the air pressure is maintained at 1 MPa and the air flow is changed to a pulsed air flow with a frequency of 1 Hz.

[0010] By adopting the above technical solutions, under the detection of the pressure sensor, the introduced air pressure value can be accurately controlled. With the control of the timing controller, demolding can be carried out in three stages. First, low-pressure air flow is introduced to break the vacuum adsorption, then the pressure is gradually increased to form an air jacking to gradually eject the product. Finally, by introducing pulsed air flow, the gaps of the product are continuously impacted, so as to eliminate the residual adhesion force, and the timing of demolding is controlled, making the demolding process smoother and further reducing the damage caused by friction and other situations.

[0011] Optionally, the low-pressure air flow introduced by the timing controller into the air pipe is 0.2 MPa, and when the pressure is stepwise boosted to 0.8 MPa, it is delayed for 50 ms and then 1 MPa and pulsed air flow with a frequency of 1 Hz are introduced.

[0012] By adopting the above technical solutions, the 0.2 MPa low-pressure air flow can gently break the vacuum, reducing the situation of damage caused by too large pressure difference formed instantaneously when breaking the vacuum. Subsequently, it is gradually stepped up to 0.8 MPa, which can gently lift the product, thus realizing soft-contact demolding. And introducing pulsed air flow with a frequency of 1 Hz can impact the product and the mold cavity at a certain frequency to eliminate the residual adhesion force and further improve the demolding effect.

[0013] Optionally, the air pressure sensor is electrically connected to the solenoid valve. When the air pressure value reaches 0.2 MPa, the solenoid valve retracts the plugging block into the storage groove.

[0014] By adopting the above technical solution, the air pressure sensor is electrically connected to the solenoid valve. The passage is opened only when demolding is required. When the air pressure value of the introduced air flow is insufficient, there is no demolding effect, so the passage is not opened either, further improving the demolding effect.

[0015] Optionally, the aperture of the honeycomb micropores on the side close to the mold cavity is larger than the aperture on the side close to the annular air passage.

[0016] By adopting the above technical solution, using a gradually changing aperture can compensate for the pressure attenuation at the end of the air flow, reducing the situation of insufficient air pressure during air jacking.

[0017] Optionally, an installation groove is further provided on the fixed template. The installation groove is arranged along the annular air passage. A plurality of segmented ejector rods are arranged in the installation groove. The segmented ejector rods include a plurality of rod bodies. Adjacent rod bodies are hinged to each other. Each rod body is hollow inside. An air cylinder for introducing gas is arranged in the segmented ejector rod. When gas is introduced into the air cylinder, the rod bodies all move vertically upward.

[0018] By adopting the above technical solution, setting the installation groove and the segmented ejector rods can contact the product in a relatively flexible manner, assist in ejecting the product mechanically while performing air jacking, and at the same time use the rod bodies that imitate the movement mode of octopus tentacles to eject the product, improving the ejecting effect and reducing the situation of wear caused by contact.

[0019] Optionally, silica gel units are arranged on the rod bodies. The silica gel units are fixedly connected to the rod bodies and are used to abut against the product.

[0020] By adopting the above technical solution, setting the silica gel units can further improve the flexibility when the rod bodies contact the product and further reduce the situation of wear.

[0021] Optionally, a communication pipe is arranged between the air cylinder and the annular air passage. One end of the communication pipe is communicated with the air cylinder, and the other end of the communication pipe is communicated with the annular air passage.

[0022] By adopting the above technical solution, the annular air passage is connected to the air cylinder. The segmented ejector rods can be ejected together with the frequency of the air jacking, synchronizing the frequency and amplitude of the air jacking, making the mechanical ejection and the air pressure ejection more synchronous, further reducing the situation of wear. And when injecting pulsed air flow, the segmented ejector rods can also eliminate the residual adhesion force at the same frequency, which can further improve the demolding effect.

[0023] Optionally, an ion generator for eliminating static adhesion is further provided in the mold cavity.

[0024] By adopting the above technical solution, the ion generator can release reverse ion wind during demolding, eliminate the demolding lag phenomenon caused by static adhesion, further improve the demolding speed, and thus further improve the demolding efficiency.

[0025] In summary, the present application has at least the following beneficial effects:

[0026] The present application solves the problem that although the mechanical ejector pin can automatically complete the ejection action during demolding in the prior art, it is easy to damage the product during the lifting process and affect the product quality. By providing air inlets and air jacking grooves to introduce gas, the present application can form gas circulation at the annular air passage, and uniformly discharge the gas to the product through the honeycomb micropores, so that the air pressure is evenly distributed, forming an air jack on the injection-molded product, and can smoothly eject the product, thereby reducing the situation of product damage and effectively improving the product quality.

[0027] The present application also provides a segmented ejector rod that imitates the tentacles of an octopus to replace the mechanical ejector pin, and uses flexible contact to eject the product, which can assist in ejecting the product and lift the product simultaneously with the air pressure, further improving the ejection efficiency of the product and reducing the situation of product wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a perspective view of this embodiment.

[0029] Figure 2 is a cross-sectional view of this embodiment.

[0030] Figure 3 is a perspective view of the fixed mold plate in this embodiment.

[0031] Figure 4 is a cross-sectional view of the fixed mold plate in this embodiment.

[0032] Description of the reference numerals:

[0033] 1. Bottom plate; 11. Air inlet; 12. Injection port;

[0034] 2. Positioning plate; 21. Injection device; 22. Air jacking groove; 221. Air pressure sensor; 222. Timing controller; 23. Storage groove; 231. Plugging block; 232. Solenoid valve;

[0035] 3. Fixed mold plate; 31. Mold cavity; 32. Annular air passage; 321. Honeycomb micropores; 33. Installation groove; 34. Segmented ejector rod; 341. Rod body; 342. Pneumatic cavity; 343. Silicone unit; 35. Connecting pipe; 36. Ion generator;

[0036] 4. Moving template; 41. Mold core. Detailed implementation manners

[0037] The following further details the present application through specific embodiments in conjunction with the accompanying drawings.

[0038] An injection mold for a plastic storage box, as Figure 1 and Figure 2 shown, includes a bottom plate 1. A positioning plate 2 is provided on the bottom plate 1. The positioning plate 2 is fixedly connected to the bottom plate 1. A fixed template 3 is provided on the positioning plate 2. The fixed template 3 is fixedly connected to the positioning plate 2. A moving template 4 is provided on the side of the fixed template 3 away from the positioning plate 2. A mold groove 31 is formed on the fixed template 3. A mold core 41 is provided on the moving template 4. The mold core 41 is arranged corresponding to the mold groove 31 of the fixed template 3. When the fixed template 3 abuts against the moving template 4, the mold core 41 is embedded in the mold groove 31 to form a cavity. In specific implementation, the moving template 4 is driven pneumatically to move. The moving template 4 is guided by a guide rod. When moving towards the fixed template 3, the mold core 41 and the mold groove 31 can be matched to form a cavity, thereby injecting and forming a product.

[0039] As Figure 1 and Figure 2 shown, an injection port 12 and an air port 11 are formed on the bottom plate 1. An injection device 21 is provided on the positioning plate 2. One side of the injection device 21 is arranged corresponding to the position of the injection port 12 and is externally connected to the injection port 12. The other side of the injection device 21 extends into the mold groove 31 and is used for injection. An air top groove 22 is provided on the positioning plate 2 corresponding to the air port 11. One side of the air top groove 22 is communicated with the air port 11. The other side of the air top groove 22 is communicated with the mold groove 31. A plugging block 231 for plugging the air top groove 22 is arranged in the air top groove 22. A storage groove 23 is also formed beside the air top groove 22. The storage groove 23 is arranged corresponding to the shape of the plugging block 231. The storage groove 23 is communicated with the air top groove 22. An electromagnetic valve 232 for driving the movement of the plugging block 231 is also provided on the positioning plate 2. In specific implementation, the connection between the injection device 21 and the mold groove 31 is not directly shown in the figure. Actually, they are directly connected. The plugging block 231 is arranged on the side close to the mold groove 31. When injecting, the plugging block 231 in the storage groove 23 can be pushed into the air top groove 22 by the electromagnetic valve 232 to plug the air top groove 22, and then the injection material is injected through the injection device 21, thereby reducing the situation that the injection material flows into the air top groove 22. When demolding is required after injection, the plugging block 231 can be removed, and then gas is introduced into the mold groove 31 through the air port 11 to eject the product by gas to achieve demolding.

[0040] As Figure 3 and Figure 4As shown in the figure, a circular air duct 32 is provided in the fixed template 3 corresponding to the air jacking groove 22. The circular air duct 32 is arranged around the mold core 41 and is set according to the shape of the product. The circular air duct 32 is communicated with the air jacking groove 22. A plurality of honeycomb micropores 321 are also provided on the fixed template 3 corresponding to the circular air duct 32. The honeycomb micropores 321 are arranged along the circular air duct 32. One side of the honeycomb micropores 321 is communicated with the circular air duct 32 and the other side is communicated with the mold cavity 31. In specific implementation, the aperture of the honeycomb micropores 321 on the side close to the mold cavity 31 is larger than the aperture on the side close to the circular air duct 32, which can compensate the end air pressure and reduce the situation that the air pressure at the outlet is less than the air pressure in the circular air duct 32. The circular air duct 32 is arranged according to the shape of the bottom of the mold cavity 31 in the fixed template 3, and the product can be ejected from various positions at the bottom of the product, so as to realize the uniform ejection of the product. The honeycomb micropores 321 can further improve the uniform distribution of air pressure, and thus further improve the uniform distribution degree of air flow, making the product more stable when demolded and jacked up. In other embodiments, the circular air duct 32 can also be changed to a horizontal and vertical criss-cross air duct to further increase the coverage range of air flow, further improve the demolding efficiency and the stability of the product during demolding. The air duct can also be arranged on the mold cavities 31 on both sides of the product to perform air jacking on the product from all directions at the same time, reducing the situation of abrasion caused by the contact between the product and the mold cavities 31 on both sides.

[0041] As Figure 3 and Figure 4 shown in the figure, a pressure sensor 221 and a timing controller 222 are also arranged in the air jacking groove 22. The pressure sensor 221 is used to detect the air pressure in the air jacking groove. The timing controller 222 is connected to the external air pipe. The timing controller 222 controls the external air pipe to inject low-pressure air flow at the moment of mold opening and step up the pressure in a gradient of less than 0.1 MPa / 50 ms to 1 MPa. When the pressure sensor 221 detects that the air pressure is 1 Mpa, the air pressure of the air flow is maintained at 1 Mpa and the air flow is changed to a pulsed air flow with a frequency of 1 Hz. In specific implementation, the low-pressure air flow introduced by the timing controller 222 into the air pipe is 0.2 MPa. The low-pressure air flow of 0.2 MPa can play a role in stably breaking the vacuum, reducing the situation of abrasion and damage caused by the product shaking due to the instantaneous breaking of the high air pressure vacuum. Then, when the pressure is stepped up to 0.8 MPa, it is delayed for 50 ms. Gradually increasing the air pressure can more stably support the product. Finally, a pulsed air flow of 1 Mpa and a frequency of 1 Hz is introduced to eliminate the residual adhesion force. The pressure sensor 221 is electrically connected to the solenoid valve 232. When the air pressure value reaches 0.2 MPa, the solenoid valve 232 retracts the plug block 231 into the storage groove 23. When demolding, it will automatically identify the air flow input and thus... In other embodiments, the peak value of the air pressure can be changed according to the volume and weight of the product, increasing the air pressure peak value to a certain extent to reduce the situation that the product cannot be ejected, thereby further improving the demolding effect.

[0042] AsFigure 4 As shown in the figure, an installation groove 33 is also formed on the fixed template 3. The installation groove 33 is arranged along the annular air duct 32. A plurality of segmented ejector rods 34 are arranged in the installation groove 33. The segmented ejector rod 34 includes a plurality of rod bodies 341. Adjacent rod bodies 341 are hinged to each other. Each rod body 341 is hollow inside. An air cylinder 342 for introducing gas is arranged in the segmented ejector rod 34. When gas is introduced into the air cylinder 342, the rod bodies 341 all move vertically upward. Silicone units 343 are arranged on the rod bodies 341. The silicone units 343 are fixedly connected to the rod bodies 341. The silicone units 343 are used to abut against the product. Specifically in implementation, the bottom rod body 341 is hinged to the fixed template 3. During injection molding, the rod bodies 341 can all be embedded in the installation groove 33 under the action of gravity without affecting the injection molding. Gas can be injected into the air cylinder 342 to lift each rod body 341, moving in a way imitating the movement of an octopus tentacle, replacing the original mechanical ejector pin to support the product. The support is softer and smoother, and can reduce the situation of product wear caused by friction during support. In other embodiments, the silicone unit 343 can also be directly used as the rod body 341. Each silicone unit 343 is segmented and connected to each other, and can move in segments, further improving the softness of the segmented ejector rod 34 and further improving the softness when contacting the product, thereby reducing the situation of product damage.

[0043] As Figure 4 shown in the figure, a connecting pipe 35 is arranged between the air cylinder 342 and the annular air duct 32. One end of the connecting pipe 35 is communicated with the air cylinder 342, and the other end of the connecting pipe 35 is communicated with the annular air duct 32. Specifically in implementation, when gas is introduced into the annular air duct 32, it can be simultaneously introduced into the air cylinder 342 to lift the rod bodies 341. The air ejector and the segmented ejector rod 34 lift the product synchronously, and the lifting is more synchronous, thus reducing the situation of product inclination and wear during the demolding process.

[0044] As Figure 3 shown in the figure, an ion generator 36 for eliminating static adhesion is also arranged in the mold cavity 31. Specifically in implementation, the ion generator 36 can generate a reverse ion wind during the demolding process. Since plastics are prone to generate static electricity and cause adsorption, the generated reverse ion wind can eliminate static electricity, thereby reducing the situation of adhesion and further improving the demolding effect.

[0045] Working principle: First, through the movement of the moving template 4 and the cooperation with the fixed template 3, the mold core 41 and the mold cavity 31 are combined to form a cavity. After injection molding in the cavity, gas is injected through the air port 11. Under the cooperation of the gas and the segmented ejector rod 34, the product is ejected synchronously, thus realizing soft-contact demolding, reducing the situation that the mechanical ejector pin is easy to cause wear to the product, and improving the demolding efficiency and the quality of the product.

[0046] The above is the preferred embodiment of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An injection mold for a plastic storage box, comprising a bottom plate (1), characterized in that: A positioning plate (2) is arranged on the bottom plate (1), the positioning plate (2) is fixedly connected to the bottom plate (1), a fixed mold plate (3) is arranged on the positioning plate (2), the fixed mold plate (3) is fixedly connected to the positioning plate (2), a movable mold plate (4) is arranged on a side of the fixed mold plate (3) away from the positioning plate (2), a mold groove (31) is opened on the fixed mold plate (3), a mold core (41) is arranged on the movable mold plate (4), the mold core (41) is arranged corresponding to the mold groove (31) of the fixed mold plate (3), and when the fixed mold plate (3) and the movable mold plate (4) are in contact, the mold core (41) is embedded in the mold groove (31) to form a mold cavity; The bottom plate (1) is provided with an injection port (12) and an air port (11); the positioning plate (2) is provided with an injection device (21); one side of the injection device (21) is arranged corresponding to the position of the injection port (12) and is externally connected to the injection port (12); the other side of the injection device (21) extends into the mold groove (31) and is used for injection molding; the positioning plate (2) is provided with an air cap groove (22) corresponding to the air port (11); one side of the air cap groove (22) is connected to the air port (11). The other side of the gas cap groove (22) is connected to the mold groove (31), a blocking block (231) for blocking the gas cap groove (22) is arranged in the gas cap groove (22), a receiving groove (23) is also provided next to the gas cap groove (22), the receiving groove (23) corresponds to the shape of the blocking block (231), the receiving groove (23) is connected to the gas cap groove (22), and the positioning plate (2) is also provided with a solenoid valve (232) for driving the blocking block (231) to move; An annular air channel (32) is provided in the fixed mold plate (3) corresponding to the air cap groove (22); the annular air channel (32) is arranged around the mold core (41) and is arranged corresponding to the shape of the product; the annular air channel (32) is communicated with the air cap groove (22); a plurality of honeycomb micropores (321) are also provided on the fixed mold plate (3) corresponding to the annular air channel (32); the honeycomb micropores (321) are arranged along the annular air channel (32); one side of the honeycomb micropores (321) is communicated with the annular air channel (32) and the other side is communicated with the mold groove (31); An air pressure sensor (221) and a timing controller (222) are also provided in the air cap groove (22); the air pressure sensor (221) is used to detect the air pressure in the air cap groove (22); the timing controller (222) is connected to an external air pipe; the timing controller (222) controls the external air pipe to inject airflow at the moment of mold opening and increase the pressure to 1 MPa with a gradient step of less than 0.1 MPa / 50 ms; when the air pressure sensor (221) detects that the air pressure is 1 MPa, the air pressure is maintained at 1 MPa and the airflow is changed to a pulsed airflow with a frequency of 1 Hz; The timing controller (222) controls the airflow entering the trachea to be 0.2 MPa and step-by-step increases the pressure to 0.8 MPa, delaying 50 ms before introducing a pulsed airflow of 1 MPa and a frequency of 1 Hz; The fixed template (3) is also provided with a mounting groove (33), the mounting groove (33) being arranged along the annular air passage (32), a plurality of segmented ejector rods (34) being arranged in the mounting groove (33), the segmented ejector rods (34) comprising a plurality of rod bodies (341), adjacent rod bodies (341) being hinged to each other, each of the rod bodies (341) being hollow inside, a pneumatic cavity (342) for introducing gas being arranged in the segmented ejector rod (34), and the rod bodies (341) all move vertically upward when gas is introduced into the pneumatic cavity (342).

2. The injection mold of a plastic storage box according to claim 1, characterized in that: The air pressure sensor (221) is electrically connected to the electromagnetic valve (232), and when the air pressure value reaches 0.2 MPa, the electromagnetic valve (232) receives the blocking block (231) into the storage groove (23).

3. The injection mold of a plastic storage box according to claim 1, characterized in that: The aperture of the honeycomb micropores (321) on the side close to the die groove (31) is larger than the aperture on the side close to the annular air channel (32).

4. The injection mold of a plastic storage box according to claim 1, characterized in that: The rod body (341) is provided with a silica gel unit (343), the silica gel unit (343) is fixedly connected to the rod body (341), and the silica gel unit (343) is used to abut against the product.

5. The injection mold of a plastic storage box according to claim 1, characterized in that: A connecting tube (35) is provided between the pneumatic cavity (342) and the annular air channel (32); one end of the connecting tube (35) is connected to the pneumatic cavity (342), and the other end of the connecting tube (35) is connected to the annular air channel (32).

6. The injection mold of a plastic storage box according to claim 5, characterized in that: An ion generator (36) for eliminating electrostatic adhesion is also arranged in the mold cavity (31).

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