Injection mold with air blow demolding

Abstract

The utility model provides a kind of injection mold of blowing demolding, including upper die plate and lower die plate, the upper side of lower die plate movably is provided with lower die push plate, lower die push plate is embedded with lower die core, upper die plate is embedded with upper die core, upper die core and lower die core are provided with cavity between, lower die plate is provided with blowing insert pin, blowing insert pin penetrates lower die push plate, lower die core, blowing insert pin has contact portion, contact portion gradually narrows towards the direction of cavity, lower die core, lower die push plate are respectively provided with first insert pin hole, second insert pin hole, blowing insert pin is provided with blowing passage, blowing passage has blowing port and gas inlet, the outside wall of contact portion is contact surface, blowing port is set on contact surface, gas inlet is communicated with blowing device;In the state of clamping, upper die core, lower die core, contact portion jointly enclose cavity, contact surface and the hole wall of first insert pin hole are attached, blowing port and cavity are not communicated;When opening, contact surface is separated from the hole wall of first insert pin hole, blowing port and cavity are communicated.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection mold for air-blowing demolding. Background Technology

[0002] Currently, injection molds are widely used in product manufacturing. Injection molds are used to inject molten plastic into a molding cavity, and after cooling and solidification, plastic products are obtained.

[0003] In existing technologies, when producing thin-walled plastic products using injection molds, the product often encounters difficulties in demolding, especially when the plastic material is TPU. The main reason is that the product forms a vacuum with the mold platen surface, causing it to adhere firmly and making automatic demolding difficult. The product usually adheres to the rear mold platen, and demolding can typically be achieved using an air blowing mechanism or ejector pin mechanism.

[0004] However, if the product is still in a vacuum state and a blower mechanism is used for demolding, the product may be deformed due to excessive air pressure, resulting in product damage. If an ejector mechanism is used for demolding, the product may be deformed or torn, resulting in product damage. Utility Model Content

[0005] The purpose of this invention is to provide an injection mold for air-blowing demolding, which aims to solve or at least partially solve the shortcomings of the above-mentioned background technology. It can not only facilitate automatic demolding of products and improve production efficiency, but also ensure that products do not deform during demolding and improve product yield.

[0006] This utility model provides an injection mold for air-blowing demolding, including an upper mold plate and a lower mold plate. A lower mold ejector plate is movably disposed above the lower mold plate, and a lower mold core is embedded in the lower mold ejector plate. An upper mold core is embedded in the upper mold plate. A cavity for molding the product is provided between the upper mold core and the lower mold core. An air-blowing insert is provided on the lower mold plate, and the air-blowing insert passes through the lower mold ejector plate and the lower mold core sequentially from bottom to top. The upper end of the air-blowing insert has a contact portion, which gradually narrows towards the cavity. The lower mold core and the lower mold ejector plate are respectively penetrated through... There are a first insert pin hole and a second insert pin hole that cooperate with the air-blowing insert pin. The air-blowing insert pin has an air-blowing channel inside. The air-blowing channel has an air-blowing port and an air-inlet. The outer wall of the contact part is the contact surface. The air-blowing port is opened on the contact surface. The air-inlet is connected to an air-blowing device. In the mold-closed state, the upper mold core, the lower mold core, and the contact part together form the mold cavity. The contact surface is in contact with the hole wall of the first insert pin hole. The air-blowing port is not connected to the mold cavity. When the mold is opened, the contact surface is separated from the hole wall of the first insert pin hole, and the air-blowing port is connected to the mold cavity.

[0007] Furthermore, the contact area is shaped like a frustum.

[0008] Furthermore, the air blowing channel has multiple air blowing ports, which are evenly distributed circumferentially on the contact surface of the contact part.

[0009] Furthermore, the air-blowing insert also has a fixing part and a connecting part and a connecting part of the fixing part. The fixing part is used to fix the air-blowing insert on the lower template, and an air inlet is provided on the fixing part.

[0010] Furthermore, the air-blowing insert penetrates the lower template from bottom to top, and a clamping block is detachably embedded on the lower surface of the lower template. The clamping block abuts against the lower surface of the fixing part to fix the air-blowing insert.

[0011] Furthermore, the radial cross-sectional area of ​​the fixing part is greater than the radial cross-sectional area of ​​the connecting part.

[0012] Furthermore, the lower template and the clamping block are respectively provided with an air inlet channel and an air guide channel. The air inlet channel is connected to the air blowing device and the air guide channel, respectively, and the air guide channel is connected to the air inlet.

[0013] Furthermore, the connecting part has a first part and a second part, the first part and the second part are respectively connected to the contact part and the fixing part, the first part and the second part are coaxial stepped structure, and the outer diameter of the first part is smaller than the outer diameter of the second part; in the mold closed state, the upper surface of the second part abuts against the lower surface of the lower mold core.

[0014] Furthermore, it also includes an ejector mechanism, which includes an ejector plate movably disposed below the lower template, and ejector pins extending toward the cavity direction are disposed on the ejector plate.

[0015] Furthermore, the ejector pin can pass through the lower mold plate and the lower mold push plate and extend into the cavity.

[0016] The air-blowing demolding injection mold provided in this embodiment utilizes the cooperation of air-blowing inserts, a lower mold push plate, and a lower mold core, along with a gradually narrowing contact area. During demolding, the air-blowing inserts can move downwards relative to the lower mold core and detach from the product. This allows the contact area of ​​the air-blowing inserts to separate from the first insert hole of the lower mold core, creating a gap that connects the air-blowing channel, the first insert hole, and the cavity. This breaks the vacuum in the cavity, effectively reducing the air pressure in subsequent processes and preventing product deformation. Through the cooperation of the air-blowing channel and the air-blowing device, the device can blow gas into the cavity, causing the product to detach from the surface of the lower mold core, enabling automatic and smooth demolding. Therefore, this air-blowing demolding injection mold not only facilitates automatic product demolding and improves production efficiency but also ensures that the product does not deform during demolding, increasing product yield. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the molded state of an air-blowing demolding injection mold according to the present invention.

[0019] Figure 2 This is a cross-sectional view of an injection mold for blow molding during demolding, according to the present invention. Figure 1 .

[0020] Figure 3 This is a cross-sectional view of an injection mold for blow molding during demolding, according to the present invention. Figure 2 .

[0021] Figure 4 This is a cross-sectional view of an injection mold for blow molding after demolding, according to the present invention.

[0022] Figure 5 for Figure 1 A magnified diagram of point A in the middle.

[0023] Figure 6 for Figure 3 A magnified diagram of point B in the middle.

[0024] Figure 7 for Figure 1 The three-dimensional view of the blown pin shown.

[0025] Figure 8 for Figure 7 The cross-sectional view of the blown pin shown.

[0026] Figure 9 For along Figure 8 A cross-sectional view of the CC line.

[0027] Figure 10 for Figure 1 A partial schematic diagram of the lower die ejector plate shown.

[0028] Figure 11 for Figure 1 The diagram shows an exploded view of the lower template.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 10. Upper mold plate; 100. Product; 11. Upper mold core; 20. Lower mold push plate; 21. Lower mold core; 22. First insert pin hole; 23. Second insert pin hole; 30. Lower mold plate; 31. Clamping block; 311. Air guide channel; 32. Air inlet channel; 33. T-shaped hole; 331. Connecting hole; 332. Fixing hole; 34. Mounting groove; 41. Air blowing channel; 411. Air blowing port; 412. Air inlet; 42. Contact part; 421. Contact surface; 43. Connecting part; 431. First part; 432. Second part; 44. Fixing part; 50. Air blowing device; 51. Air pipe; 60. Ejector mechanism; 61. Ejector plate; 62. Ejector pin; 70. Cavity. Detailed Implementation

[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0032] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0033] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this utility model are defined according to the position of the structures in the drawings and the relative positions of the structures, and are only for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0034] Please see Figure 1 , Figure 5 , Figure 6 and Figure 8 An injection mold for blow molding includes an upper mold plate 10 and a lower mold plate 30. A lower mold push plate 20 is movably disposed above the lower mold plate 30. A lower mold core 21 is embedded in the lower mold push plate 20. An upper mold core 11 is embedded in the upper mold plate 10. A cavity 70 for molding a product 100 is provided between the upper mold core 11 and the lower mold core 21.

[0035] The lower mold plate 30 is provided with an air-blowing insert 40, which passes through the lower mold push plate 20 and the lower mold core 21 from bottom to top.

[0036] The upper end of the air-blowing insert 40 has a contact portion 42, which gradually narrows towards the cavity 70. The lower mold core 21 and the lower mold push plate 20 are respectively provided with a first insert hole 22 and a second insert hole 23 that cooperate with the air-blowing insert 40.

[0037] The blow-in insert 40 has an air-blowing channel 41 inside. The air-blowing channel 41 has an air-blowing port 411 and an air inlet 412. The outer wall of the contact part 42 is a contact surface 421. The air-blowing port 411 is opened on the contact surface 421. The air inlet 412 is connected to an air-blowing device 50.

[0038] In the mold closed state, the upper mold core 11, the lower mold core 21, and the contact part 42 together form the cavity 70. The contact surface 421 is in contact with the hole wall of the first pin hole 22, and the air blowing port 411 is not connected to the cavity 70.

[0039] When the mold is opened, the contact surface 421 is separated from the hole wall of the first pin hole 22, and the air blowing port 411 is connected to the cavity 70.

[0040] As described above, the air-blowing demolding injection mold provided in this embodiment of the present invention, through the cooperation of the air-blowing insert 40, the lower mold push plate 20, and the lower mold core 21, and the gradually narrowing contact portion 42, allows the air-blowing insert 40 to move downward relative to the lower mold core 21 and detach from the product 100 during the demolding process. This causes the contact portion 42 of the air-blowing insert 40 to separate from the first insert hole 22 of the lower mold core 21, creating a gap. This connects the air-blowing channel 41, the first insert hole 22, and the cavity 70, thereby breaking the vacuum in the cavity 70 and effectively reducing the air pressure blown by the air-blowing device 50 in subsequent processes, preventing the product 100 from being deformed by air. Through the cooperation of the air-blowing channel 41 and the air-blowing device 50, the air-blowing device 50 can blow gas into the cavity 70, causing the product 100 to detach from the surface of the lower mold core 21, thus enabling the product 100 to be automatically and smoothly demolded. Therefore, this air-blowing demolding injection mold not only facilitates automatic demolding of products and improves production efficiency, but also ensures that products do not deform during demolding, thereby improving product yield.

[0041] Please see Figure 7 The number and shape of the air-blowing inserts 40 need to be determined based on the specific quantity and shape of the product 100. In this embodiment, the contact portion 42 is frustum-shaped. Choosing to process the contact portion 42 into a frustum shape not only simplifies the processing technology and reduces processing costs, but also facilitates installation, as it can be inserted into the lower mold push plate 20 without considering the installation direction.

[0042] Please see Figures 7-9 Furthermore, the air blowing channel 41 has multiple air blowing ports 411, which are evenly distributed circumferentially on the contact surface 421 of the contact portion 42. During demolding, the multiple evenly distributed air blowing ports 411 not only make the air blowing more uniform and promote the uniform flow of gas reaching the cavity 70 to the periphery of the product 100 to ensure smooth demolding, but also effectively reduce the air blowing pressure of the air blowing device 50 to prevent the product 100 from being deformed by blowing.

[0043] Furthermore, the air-blowing insert 40 also has a fixing part 44 and a connecting part 42 and a connecting part 43 of the fixing part 44. The fixing part 44 is used to fix the air-blowing insert 40 on the lower template 30. An air inlet 412 is provided on the fixing part 44. In this embodiment, the air inlet 412 is provided on the lower surface of the fixing part 44.

[0044] Please see Figure 1 , Figure 8 , Figure 10 and Figure 11 Furthermore, the air-blowing insert 40 penetrates the lower mold plate 30 from bottom to top. A clamping block 31 is detachably embedded on the lower surface of the lower mold plate 30. The clamping block 31 abuts against the lower surface of the fixing part 44 to fix the air-blowing insert 40. The clamping block 31 is fixed by fasteners, and the air-blowing insert 40 is fixed by clamping, so that the air-blowing insert 40 can be detachably installed on the lower mold plate 30. This structure facilitates the replacement of the air-blowing insert 40, making it convenient for replacement or maintenance and reducing the maintenance cost of the mold.

[0045] Furthermore, the radial cross-sectional area of ​​the fixing part 44 is greater than the radial cross-sectional area of ​​the connecting part 43, thereby ensuring that the fixing part 44 is pressed against the lower template 30, and the upper and lower surfaces of the fixing plate abut against the lower template 30 and the pressing block 31, respectively.

[0046] More specifically, the lower template 30 has a T-shaped hole 33 that mates with the air-blowing insert 40 and a mounting groove 34 that mates with the clamping block 31. The T-shaped hole 33 and the mounting groove 34 are connected. The T-shaped hole 33 has a connecting hole 331 and a fixing hole 332. The upper and lower ends of the connecting hole 331 are connected to the upper surface of the lower template 30 and the fixing hole 332, respectively. The end of the fixing hole 332 away from the connecting hole 331 is connected to the mounting groove 34. The connecting part 43 passes through the connecting hole 331, the fixing part 44 is disposed in the fixing hole 332, and the clamping block 31 is disposed in the mounting groove 34.

[0047] Furthermore, the lower template 30 and the clamping block 31 are respectively provided with an air inlet channel 32 and an air guide channel 311. The air inlet channel 32 is connected to the air blowing device 50 and the air guide channel 311, respectively. The air guide channel 311 is connected to the air inlet 412, thereby connecting the air blowing device 50 and the air blowing channel 41. More specifically, the air blowing device 50 is an air compressor, and the air outlet of the air blowing device 50 is connected to the air inlet of the air inlet channel 32 through an air pipe 51.

[0048] Please see Figure 5 , Figure 8 and Figure 10More specifically, the connecting part 43 has a first part 431 and a second part 432. The first part 431 and the second part 432 are connected to the contact part 42 and the fixing part 44, respectively. The first part 431 and the second part 432 have a coaxial stepped structure, and the outer diameter of the first part 431 is smaller than the outer diameter of the second part 432. This structure plays a positioning role for the contact part 42 of the air-blowing insert 40. In the mold-closed state, the upper surface of the second part 432 abuts against the lower surface of the lower mold core 21 to prevent the air-blowing insert 40 from excessively extending into the cavity 70 and affecting the shape of the product 100.

[0049] Additionally, during demolding, after the air blowing device 50 stops working, the product 100 on the lower mold core 21 will be loosened and can be directly removed by a worker or robot. Alternatively, an ejector mechanism 60 can be added to eject the product 100 first, and then the worker or robot can remove it. Therefore, please refer to [link / reference needed]. Figure 4 The air-blowing demolding injection mold also includes an ejector mechanism 60, which includes an ejector plate 61 movably disposed below the lower mold plate 30, and ejector pins 62 extending toward the cavity 70 on the ejector plate 61. The ejector pins 62 can pass through the lower mold plate 30 and the lower mold push plate 20 and extend into the cavity 70.

[0050] The ejector plate 61 drives the ejector pin 61 to move upward and push the product 100 out, which makes it convenient for workers or robotic arms to take out the product 100 and further improve production efficiency.

[0051] The demolding process of the injection mold provided by this utility model is as follows:

[0052] (1) Please refer to Figure 1 and Figure 5 In the mold closed state, the contact surface 421 of the air-blowing insert 40 is in contact with the hole wall of the first insert hole 22. At this time, the air-blowing channel 41 is not connected to the cavity 70. After injection molding, the upper surface of the contact part 42 abuts against the surface of the product 100.

[0053] (2) Please refer to Figure 2 The mold is opened, the upper mold plate 10 moves upward, the upper mold core 11 detaches from the product 100, and the product 100 is adsorbed onto the lower mold core 21.

[0054] (3) Please refer to Figure 3 and Figure 6 When the vacuum is broken, the lower mold push plate 20 moves upward by 5mm, and the lower mold core 21 and the product 100 follow the lower mold push plate 20 to move upward by 5mm. Then, the air blowing pin 40 moves downward by 5mm relative to the first pin hole 22, and the upper surface of the contact part 42 separates from the product 100. At the same time, the contact surface 421 separates from the hole wall of the first pin hole 22, thereby creating a gap between the contact part 42 and the first pin hole 22. At this time, the air blowing channel 41 is connected to the cavity 70, realizing the breaking of the vacuum in the cavity 70.

[0055] (4) Air blowing demolding: The air blowing device 50 starts working and supplies gas to the air blowing channel 41 through the air inlet channel 32 and the air guide channel 311. The gas is blown into the cavity 70 through the air blowing channel 41 and the first insert hole 22, causing the product 100 to detach from the lower mold core 21.

[0056] (5) Please refer to Figure 4 When the product is ejected, the air blowing device 50 stops working, and the ejector plate 61 drives the ejector pin 61 to move upward to eject the product 100. The product 100 can then be removed manually or by a robotic arm.

[0057] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An injection mold for blow molding and demolding, comprising an upper mold plate (10) and a lower mold plate (30), wherein a lower mold push plate (20) is movably disposed above the lower mold plate (30), a lower mold core (21) is embedded in the lower mold push plate (20), an upper mold core (11) is embedded in the upper mold plate (10), and a cavity (70) for molding a product (100) is provided between the upper mold core (11) and the lower mold core (21), characterized in that, The lower template (30) is provided with an air-blowing insert (40), which passes through the lower mold push plate (20) and the lower mold core (21) from bottom to top. The upper end of the air-blowing insert (40) has a contact part (42), which gradually narrows towards the cavity (70). The lower mold core (21) and the lower mold push plate (20) are respectively provided with a first insert hole (22) and a second insert hole (23) that cooperate with the air-blowing insert (40). An air-blowing channel (41) is provided inside the air-blowing insert (40). The air-blowing channel (41) has an air-blowing port (411) and an air inlet (412). The outer side wall of the contact part (42) is a contact surface (421). The air-blowing port (411) is opened on the contact surface (421). The air inlet (412) is connected to an air-blowing device (50). In the mold-closed state, the upper mold core (11), the lower mold core (21), and the contact part (42) together form the cavity (70), the contact surface (421) is in contact with the hole wall of the first insert hole (22), and the air blowing port (411) is not connected to the cavity (70); When the mold is opened, the contact surface (421) is separated from the hole wall of the first insert hole (22), and the air blowing port (411) is connected to the cavity (70).

2. The injection mold for air-blowing demolding as described in claim 1, characterized in that, The contact portion (42) is frustum-shaped.

3. The injection mold for air-blowing demolding as described in claim 2, characterized in that, The air blowing channel (41) has a plurality of air blowing ports (411), which are evenly distributed in a circular pattern on the contact surface (421) of the contact portion (42).

4. The injection mold for air-blowing demolding as described in claim 1, characterized in that, The air-blowing insert (40) also has a fixing part (44) and a connecting part (43) connecting the contact part (42) and the fixing part (44). The fixing part (44) is used to fix the air-blowing insert (40) on the lower template (30). The air inlet (412) is provided on the fixing part (44).

5. The injection mold for air-blowing demolding as described in claim 4, characterized in that, The air-blowing insert (40) penetrates the lower template (30) from bottom to top. A clamping block (31) is detachably embedded on the lower surface of the lower template (30). The clamping block (31) abuts against the lower surface of the fixing part (44) to fix the air-blowing insert (40).

6. The injection mold for air-blowing demolding as described in claim 5, characterized in that, The radial cross-sectional area of ​​the fixing part (44) is greater than the radial cross-sectional area of ​​the connecting part (43).

7. The injection mold for air-blowing demolding as described in claim 5, characterized in that, The lower template (30) and the pressing block (31) are respectively provided with an air inlet channel (32) and an air guide channel (311). The air inlet channel (32) is connected to the air blowing device (50) and the air guide channel (311), respectively. The air guide channel (311) is connected to the air inlet (412).

8. The injection mold for air-blowing demolding as described in claim 4, characterized in that, The connecting part (43) has a first part (431) and a second part (432). The first part (431) and the second part (432) are respectively connected to the contact part (42) and the fixing part (44). The first part (431) and the second part (432) are coaxial stepped structures. The outer diameter of the first part (431) is smaller than the outer diameter of the second part (432). In the mold closing state, the upper surface of the second part (432) abuts against the lower surface of the lower mold core (21).

9. The injection mold for air-blowing demolding as described in claim 1, characterized in that, It also includes an ejector mechanism (60), which includes an ejector plate (61) movably disposed below the lower template (30), and ejector pins (62) extending toward the cavity (70) are disposed on the ejector plate (61).

10. The injection mold for air-blowing demolding as described in claim 9, characterized in that, The ejector pin (62) can pass through the lower template (30), the lower mold push plate (20) and extend into the cavity (70).

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