Injection mold for plastic storage box

Abstract

The invention relates to a plastic storage box mold, in particular to an injection mold of a plastic storage box. During injection molding, a movable mold plate is pressed towards a fixed mold plate, a mold core and a mold groove can be matched to form a cavity for injection molding, and after injection molding is completed, demolding can be conducted by moving out the movable mold plate; gas is introduced through the gas port and the gas cap groove, gas circulation is formed at the annular gas channel in the positioning plate, the gas is uniformly discharged to a product through the honeycomb-shaped micropores, and the honeycomb-shaped micropores can enable gas pressure to be uniformly distributed and sprayed onto the product, so that a gas cap is formed for the product subjected to injection molding, and the product quality is improved. And the product can be slowly and smoothly ejected, so that the condition of product damage is reduced, and the product quality is effectively improved.

Description

Technical Field

[0001] The invention relates to a plastic storage box mould, in particular to an injection mould of the plastic storage box. Background Art

[0002] As an important tool for producing plastic products, injection molds are widely used in the automotive, electronics, packaging and other industries. They not only give plastic products a complete structure and precise dimensions, but also enable 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 are also facing many challenges, especially in terms of improving product quality and reducing costs.

[0003] In the process of injection molding, in order to ensure the smooth removal of the product, a variety of methods are usually used to assist demolding. Common methods include manual ejection and mechanical ejector. Among them, manual ejection requires human intervention, which is time-consuming and laborious. Although the mechanical ejector can automatically complete the ejection action, it is easy to cause damage to the product during the ejection process, which can easily affect the product quality. Scratches and friction on the surface of this kind of inclined storage box can easily affect sales. Summary of the invention

[0004] In order to solve the problem that although the mechanical ejector can automatically complete the ejection action during demolding in the prior art, it is easy to cause damage to the product during the ejection process and easily affect the product quality, the present application provides an injection mold for a plastic storage box, and the specific solution is as follows.

[0005] An injection mold for a plastic storage box, comprising a bottom plate, a positioning plate arranged on the bottom plate, the positioning plate being fixedly connected to the bottom plate, a fixed mold plate arranged on the positioning plate, the fixed mold plate being fixedly connected to the positioning plate, a movable mold plate arranged on a side of the fixed mold plate away from the positioning plate, a mold groove being opened on the fixed mold plate, a mold core being arranged on the movable mold plate, the mold core being arranged corresponding to the mold groove of the fixed mold plate, and the mold core being embedded in the mold groove to form a mold cavity when the fixed mold plate abuts against the movable mold plate; An injection port and an air port are provided on the bottom plate, an injection device is provided on the positioning plate, one side of the injection device is provided corresponding to the position of the injection port and is externally connected to the injection port, the other side of the injection device extends into the mold groove and is used for injection molding, an air top groove is provided corresponding to the air port on the positioning plate, one side of the air top groove is connected to the air port, and the other side of the air top groove is connected to the mold groove, a blocking block for blocking the air top groove is provided in the air top groove, a receiving groove is also provided next to the air top groove, the receiving groove is provided corresponding to the shape of the blocking block, the receiving groove is connected to the air top groove, and an electromagnetic valve for driving the blocking block to move is also provided on the positioning plate; An annular air channel is provided in the fixed template corresponding to the air cap groove, the annular air channel is arranged around the mold core and corresponds to the shape of the product, the annular air channel is connected to the air cap groove, and 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 connected to the annular air channel and the other side is connected to the mold groove.

[0006] By adopting the above technical scheme, the movable template is pressed toward the fixed template during injection molding, and the mold core and the mold groove can cooperate to form a cavity for injection molding. After the injection molding is completed, the movable template can be removed for demoulding, and the air port and the air cap groove are set to let gas in, which can form gas circulation in the annular airway and discharge the gas evenly to the product through the honeycomb micropores, so that the air pressure is evenly distributed, forming an air cap for the injection molded product, and can eject the product gently and smoothly, thereby reducing product damage and effectively improving product quality.

[0007] Optionally, an air pressure sensor and a timing controller are also provided in the air cap groove, the air pressure sensor is used to detect the air pressure in the air cap groove, and the timing controller is connected to an external air pipe, the timing controller controls the external air pipe to inject low-pressure airflow at the moment of mold opening and increase the pressure to 1MPa with a gradient step of less than 0.1MPa / 50ms, and when the air pressure sensor detects that the air pressure is 1MPa, it maintains the air pressure at 1MPa and changes the airflow to a pulsed airflow with a frequency of 1Hz.

[0008] By adopting the above technical scheme, under the detection of the air pressure sensor, the air pressure value can be accurately controlled, and with the control of the timing controller, demoulding can be performed in three stages. First, a low-pressure airflow is introduced to break the vacuum adsorption, and then the pressure is gradually increased to form an air cap to gradually eject the product. Finally, a pulsed airflow is introduced to continuously impact the gaps in the product, thereby eliminating residual adhesion and performing timing control on demoulding, making the demoulding process smoother and further reducing damage due to friction and the like.

[0009] Optionally, the timing controller controls the low-pressure airflow entering the trachea to be 0.2 MPa and when the pressure is step-by-step increased to 0.8 MPa, a pulsed airflow of 1 MPa and a frequency of 1 Hz is introduced after a delay of 50 ms.

[0010] By adopting the above technical solution, the low-pressure airflow of 0.2MPa can gently break the vacuum and reduce the damage caused by the excessive pressure difference formed instantly when breaking the vacuum. Then it gradually rises to 0.8MPa, which can lift the product more gently, thereby realizing soft contact demolding. The pulsed airflow with a frequency of 1Hz can impact the product and the mold cavity at a certain frequency, eliminate residual adhesion, and further improve the demolding effect.

[0011] Optionally, the air pressure sensor is electrically connected to the solenoid valve, and when the air pressure value reaches 0.2 MPa, the solenoid valve stores the blocking block into the storage groove.

[0012] By adopting the above technical solution, the air pressure sensor is electrically connected to the solenoid valve, and the passage is opened only when demoulding is required. When the air pressure value of the incoming air flow is insufficient, there is no demoulding effect, so the passage is not opened, thereby further improving the demoulding effect.

[0013] Optionally, the aperture of the honeycomb micropores on a side close to the mold groove is larger than the aperture on a side close to the annular air channel.

[0014] By adopting the above technical solution, the use of a gradual aperture can compensate for the pressure attenuation at the end of the air flow and reduce the situation of insufficient air pressure during air capping.

[0015] Optionally, the fixed template is further provided with an installation groove, which is arranged along the annular airway. 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. A pneumatic cavity for introducing gas is arranged inside the segmented ejector rod. When gas is introduced into the pneumatic cavity, the rod bodies all move vertically upward.

[0016] By adopting the above technical solution, setting a mounting groove and setting a segmented ejector rod, it is possible to contact the product in a relatively flexible manner, and mechanically assist the ejection of the product while air ejection is performed. At the same time, a rod body that imitates the movement of octopus tentacles is used to eject the product, thereby improving the ejection effect and reducing wear caused by contact.

[0017] Optionally, a silicone unit is provided on the rod body, the silicone unit is fixedly connected to the rod body, and the silicone unit is used to abut against the product.

[0018] By adopting the above technical solution, the provision of a silicone unit can further improve the flexibility of the rod body when in contact with the product, and further reduce wear.

[0019] Optionally, a connecting tube is provided between the pneumatic cavity and the annular airway, one end of the connecting tube is connected to the pneumatic cavity, and the other end of the connecting tube is connected to the annular airway.

[0020] By adopting the above technical solution, the annular airway is connected with the pneumatic cavity, and the segmented ejector rod can be ejected together with the frequency of the air ejector, synchronizing the frequency and amplitude of the air ejector, so that the mechanical ejection and the air pressure ejection are more synchronized, further reducing the wear. When the pulse airflow is injected, the segmented ejector rod can also eliminate the residual adhesion at the same frequency, which can further improve the demolding effect.

[0021] Optionally, an ion generator for eliminating electrostatic adhesion is also provided in the mold cavity.

[0022] By adopting the above technical solution, the ion generator can release reverse ion wind during demoulding, eliminate the demoulding lag caused by electrostatic adhesion, further increase the demoulding speed, and thus further improve the demoulding efficiency.

[0023] In summary, this application has at least the following beneficial effects: The present application solves the problem that, although the mechanical ejector can automatically complete the ejection action during demoulding in the prior art, it is easy to damage the product during the ejection process, which is easy to affect the product quality. The present application sets an air port and an air ejector groove to allow gas to flow, so that gas circulation can be formed in the annular airway, and the gas is evenly discharged onto the product through the honeycomb micropores, so that the gas pressure is evenly distributed, and an air ejector is formed on the product after injection molding, which can gently and smoothly eject the product, thereby reducing product damage and effectively improving product quality. The present application also provides a segmented ejector rod that imitates octopus tentacles, replacing the mechanical ejector pin, and uses flexible contact to eject the product, which can assist in ejecting the product and simultaneously lift the product with air pressure, thereby further improving the ejection efficiency of the product and reducing the wear of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a stereogram of this embodiment.

[0025] Figure 2 is a cross-sectional view of this embodiment.

[0026] Figure 3 It is a stereogram of the fixed template in this embodiment.

[0027] Figure 4 It is a cross-sectional view of the fixed template in this embodiment.

[0028] Description of reference numerals: 1. Bottom plate; 11. Air port; 12. Injection port; 2. Positioning plate; 21. Injection molding device; 22. Air cap groove; 221. Air pressure sensor; 222. Timing controller; 23. Storage groove; 231. Blocking block; 232. Solenoid valve; 3. Fixed mold plate; 31. Mold groove; 32. Annular air channel; 321. Honeycomb micropores; 33. Mounting groove; 34. Segmented ejector rod; 341. Rod body; 342. Pneumatic cavity; 343. Silicone unit; 35. Connecting pipe; 36. Ion generator; 4. Moving template; 41. Mold core. DETAILED DESCRIPTION

[0029] The present application is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0030] An injection mold for a plastic storage box, such as Figure 1 and Figure 2 As shown, it includes a base plate 1, a positioning plate 2 is arranged on the base plate 1, the positioning plate 2 is fixedly connected to the base plate 1, a fixed template 3 is arranged on the positioning plate 2, the fixed template 3 is fixedly connected to the positioning plate 2, a movable template 4 is arranged on the side of the fixed template 3 away from the positioning plate 2, a mold groove 31 is opened on the fixed template 3, and a mold core 41 is arranged on the movable template 4. The mold core 41 is arranged corresponding to the mold groove 31 of the fixed template 3. When the fixed template 3 and the movable template 4 are in contact, the mold core 41 is embedded in the mold groove 31 to form a cavity. In specific implementation, the movable template 4 is driven and moved by pneumatic means, and the movable template 4 is guided by a guide rod. When it moves toward the fixed template 3, the mold core 41 can be matched with the mold groove 31 to form a cavity, thereby forming a product by injection molding.

[0031] like Figure 1 and Figure 2 As shown, an injection port 12 and an air port 11 are provided on the base plate 1, an injection molding device 21 is provided on the positioning plate 2, one side of the injection molding device 21 is provided at a position corresponding to the injection molding port 12 and is externally connected to the injection molding port 12, the other side of the injection molding device 21 extends into the mold groove 31 and is used for injection molding, 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 connected with the air port 11, and the other side of the air top groove 22 is connected with the mold groove 31, a blocking block 231 for blocking the air top groove 22 is provided in the air top groove 22, a receiving groove 23 is also provided next to the air top groove 22, the receiving groove 23 corresponds to the shape of the blocking block 231, the receiving groove 23 is connected with the air top groove 22, and the positioning plate 2 is also provided with a solenoid valve 232 for driving the blocking block 231 to move. In specific implementation, the connection between the injection molding device 21 and the mold groove 31 is not directly shown in the figure, but they are actually directly connected. The blocking block 231 is arranged on the side close to the mold groove 31. When injection molding is performed, the blocking block 231 in the receiving groove 23 can be pushed into the air top groove 22 by the solenoid valve 232 to block the air top groove 22, and then the injection molding material is injected into it through the injection molding device 21, thereby reducing the injection molding material from flowing into the air top groove 22. When the injection molding is completed and demolding is required, the blocking block 231 can be removed, and then gas is introduced into the mold groove 31 toward the air top groove 22 through the air port 11 to support the product through the gas to achieve demolding.

[0032] like Figure 3 and Figure 4As shown, an annular air channel 32 is provided in the fixed mold plate 3 corresponding to the air top groove 22, the annular air channel 32 is arranged around the mold core 41 and corresponds to the shape of the product, the annular air channel 32 is connected to the air top groove 22, and 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 connected to the annular air channel 32 and the other side is connected to the mold groove 31. In specific implementation, the aperture of the honeycomb micropore 321 close to the mold groove 31 is larger than the aperture close to the annular air channel 32, which can compensate for the end air pressure and reduce the situation where the air pressure at the outlet is less than the air pressure in the annular air channel 32. The annular air channel 32 is arranged around the shape of the bottom of the mold groove 31 in the fixed mold plate 3, and the product can be ejected from various positions at the bottom of the product, thereby realizing uniform ejection of the product, and the honeycomb micropores 321 can further improve the uniform distribution of the air pressure, thereby further improving the uniform distribution of the air flow, so that the product is more stable when demolding and being ejected. In other embodiments, the annular air duct 32 can also be changed into a horizontal and vertical crisscross air duct to further increase the coverage of the airflow, further improve the demolding efficiency and the stability of the product during demolding, and the air duct can also be arranged on the mold grooves 31 on both sides of the product to perform air capping on the product from all directions at the same time, thereby reducing the wear caused by the contact between the product and the mold grooves 31 on both sides.

[0033] like Figure 3 and Figure 4 As shown, 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, and the timing controller 222 is connected to an external air pipe. The timing controller 222 controls the external air pipe to inject low-pressure airflow at the moment of mold opening and increase the pressure to 1MPa with a gradient step of less than 0.1MPa / 50ms. When the air pressure sensor 221 detects that the air pressure is 1Mpa, the air pressure of the airflow is maintained at 1Mpa and the airflow is changed to a pulsed airflow with a frequency of 1Hz. In specific implementation, the timing controller 222 controls the low-pressure airflow entering the air pipe to be 0.2MPa. The low-pressure airflow of 0.2MPa can play a stable role in breaking the vacuum, reducing the situation where the high pressure breaks the vacuum instantly and causes the product to shake and wear and damage. Then, when the pressure is stepped up to 0.8MPa, it is delayed by 50ms. The step-by-step increase in pressure can more stably support the product. Finally, a pulsed airflow of 1Mpa and a frequency of 1Hz is introduced to eliminate the residual adhesion. The air pressure sensor 221 is electrically connected to the solenoid valve 232. When the air pressure value reaches 0.2MPa, the solenoid valve 232 will collect the blocking block 231 into the storage groove 23. When demolding is performed, it will automatically identify the airflow inflow and thus. In other embodiments, the peak value of the air pressure can be changed according to the volume and weight of the product, and the peak value of the air pressure can be increased to a certain extent to reduce the situation where the product cannot be ejected, thereby further improving the demolding effect.

[0034] like Figure 4 As shown, the fixed template 3 is also provided with a mounting groove 33, which is arranged along the annular airway 32, and a plurality of segmented ejector rods 34 are arranged in the mounting groove 33, and the segmented ejector rods 34 include a plurality of rod bodies 341, and the adjacent rod bodies 341 are hinged to each other, and each rod body 341 is hollow inside, and a pneumatic cavity 342 for introducing gas is arranged in the segmented ejector rod 34, and when gas is introduced into the pneumatic cavity 342, the rod bodies 341 all move vertically upward. A silicone unit 343 is arranged on each rod body 341, and the silicone unit 343 is fixedly connected to the rod body 341, and the silicone unit 343 is used to abut against the product. In specific implementation, the rod body 341 at the bottom is hinged with the fixed template 3. During injection molding, the rod bodies 341 can be embedded in the installation grooves 33 under the action of gravity, which will not affect the injection molding. Gas can be injected into the pneumatic cavity 342 to lift each rod body 341, imitating the movement of octopus tentacles, and replacing the original mechanical top pin to support the product. It is softer and smoother when supporting, and can reduce the friction caused by the support and the wear of the product. 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 in contact with the product, thereby reducing product damage.

[0035] like Figure 4 As shown, a connecting pipe 35 is provided between the pneumatic cavity 342 and the annular air channel 32, one end of the connecting pipe 35 is connected to the pneumatic cavity 342, and the other end of the connecting pipe 35 is connected to the annular air channel 32. In specific implementation, when gas is introduced into the annular air channel 32, it can also be introduced into the pneumatic cavity 342 to lift the rod body 341, and the gas lift and the segmented ejector rod 34 simultaneously lift the product, and the lifting is more synchronous, thereby reducing the wear caused by the product tilting during the demoulding process.

[0036] like Figure 3 As shown, an ion generator 36 for eliminating static adhesion is also provided in the mold cavity 31. In specific implementation, the ion generator 36 can generate reverse ion wind during the demoulding process. Since plastics are prone to static electricity and adsorption, the generated reverse ion wind can eliminate static electricity, thereby reducing adhesion and further improving the demoulding effect.

[0037] Working principle: First, the movable template 4 cooperates with the fixed template 3 through movement, and the mold core 41 and the mold groove 31 cooperate to form a cavity. After injection molding is realized in the cavity, gas is injected through the gas port 11. With the cooperation of gas and the segmented ejector rod 34, the product is ejected synchronously, thereby realizing soft contact demoulding, reducing the wear of the product caused by the use of mechanical ejectors, thereby improving the demoulding efficiency and product quality.

[0038] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in 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).

2. The injection mold of a plastic storage box according to claim 1, characterized in that: 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 in 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.

3. The injection mold of a plastic storage box according to claim 2, characterized in that: The timing controller (222) controls the airflow entering the trachea to be 0.2 MPa, and when the pressure is stepped up to 0.8 MPa, a pulsed airflow of 1 MPa and a frequency of 1 Hz is introduced after a delay of 50 ms.

4. The injection mold of a plastic storage box according to claim 2, 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).

5. The injection mold of a plastic storage box according to claim 2, 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).

6. The injection mold of a plastic storage box according to claim 3, characterized in that: 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).

7. The injection mold of a plastic storage box according to claim 6, 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.

8. The injection mold of a plastic storage box according to claim 6, 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).

9. The injection mold of a plastic storage box according to claim 7, characterized in that: An ion generator (36) for eliminating electrostatic adhesion is also arranged in the mold cavity (31).

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