Anti-strain structure based on deep-cavity injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to an anti-strain structure based on a deep-cavity injection mold, which comprises a base and first guide rods fixed at four corners of the top of the base, a mold structure is arranged on the first guide rods and is used for injection molding, and the mold structure comprises a lower mold assembly, an upper mold assembly and a lower mold assembly, comprising a lower die holder slidably mounted above a base through a first guide rod, a mounting plate slidably mounted at the lower end in the lower die holder, a base plate mounted at the top of the mounting plate, a plurality of ejector pins mounted on the base plate, and a lower die head mounted at the upper end in the lower die holder; the upper die assembly comprises an upper die base installed at the upper end of the lower die base and an upper die head installed at the lower end in the upper die base. The anti-strain assembly comprises a bottom plate fixed to the top of the base, a second air cylinder installed at one end of the bottom plate and a lower inclined block installed at the output end of the second air cylinder. And the phenomenon that the product is directly ejected out after the mold is opened, so that the surface of the product is locally and non-uniformly pressed and is whitened is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an anti-strain structure based on a deep-cavity injection mold. Background Art

[0002] With the rapid development of the plastics industry and the continuous improvement of the strength of general-purpose and engineering plastics, the application scope of plastic products is also expanding, and the consumption of plastic products is also increasing. Injection molds are a tool for producing plastic products. Its components mainly include a runner system, a molding system, and an ejection structure. The molding system contains a molding cavity. During injection molding, the mold is clamped on the injection molding machine, and the molten plastic is injected into the molding cavity and cooled and shaped in the cavity. Then the upper and lower molds are separated, and the product is ejected from the mold cavity by the ejection structure. Finally, the mold is closed again for the next injection molding. The entire injection molding process is carried out in a cycle;

[0003] After checking the publication number: CN217346463U, it is disclosed that an injection mold for preventing a push plate from pulling a product when the mold is opened is disclosed. This technology discloses "an injection mold for preventing a push plate from pulling a product when the mold is opened, comprising: a front mold and a rear mold arranged opposite to the front mold, a push plate for ejecting the molded product is installed on the rear mold, and an anti-strain mechanism is installed between the front mold and the rear mold, the anti-strain mechanism comprises a limiting plug and a pull plate that cooperate with each other, one end of the pull plate is rotatably arranged on the rear mold, the limiting plug plate is fixed to the front mold, and the limiting plug plate abuts against one side of the pull plate so that the other end of the pull plate is clamped on the push plate, the pull plate can limit the push plate from being driven by the front mold during the mold opening process, and release the restriction on the push plate when the limiting plug plate is separated from the pull plate" and other technical solutions, which have the technical effects of "ensuring that the push plate will not loosen at the moment of mold opening, preventing the product from being pulled, making the quality more stable and reliable, and achieving fast and short-cycle molding";

[0004] During the manufacturing process of deep-cavity injection molds, the mold expands when initially heated, causing its outer surface to adhere tightly to the upper mold cavity. Lifting the upper mold directly can scratch the product's surface due to excessive friction. Furthermore, once the upper mold is removed, the product surface is left unsupported. Using ejectors at this point can easily create a "whitening" effect on the product. This is because the ejector pins forcefully eject the product without support, causing uneven pressure on the surface and causing it to turn white, thus affecting the overall quality of the product. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the utility model provides an anti-strain structure based on a deep-cavity injection mold. When the mold is opened, the lower mold assembly is driven downward by the first cylinder. At the same time, the second cylinder drives the lower inclined block to cooperate with the upper inclined block to drive the top plate to move upward. The top plate drives the ejector on the base plate through the vertical rod and the mounting plate to press the molded product into the upper mold assembly. When the ejector is retracted and reset, the product falls off from the upper mold assembly and is discharged, avoiding the phenomenon of directly ejecting the product after the mold is opened, resulting in uneven pressure on the local surface of the product and whitening.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an anti-strain structure based on a deep cavity injection mold, comprising a base, a first guide rod fixed at each of the four corners of the top of the base, a mold structure provided on the first guide rod and used for injection molding, the mold structure comprising:

[0007] The lower mold assembly includes a lower mold base slidably mounted above the base via a first guide rod, a mounting plate slidably mounted at the lower end of the lower mold base, a base plate mounted on top of the mounting plate, a plurality of ejector pins mounted on the base plate, and a lower mold head mounted at the upper end of the lower mold base;

[0008] The upper mold assembly includes an upper mold base mounted on the upper end of the lower mold base, and an upper mold head mounted on the lower end of the upper mold base;

[0009] The anti-strain component includes a base plate fixed to the top of the base, a second cylinder installed at one end of the base plate, a lower inclined block installed at the output end of the second cylinder, a top plate fixed at the lower end of the mounting plate through a vertical rod, and an upper inclined block fixed at the bottom of the top plate and matched with the lower inclined block.

[0010] Preferably, the anti-strain component further comprises a guide rail fixed to the top of the base plate, and the lower inclined block is slidably installed inside the guide rail.

[0011] Preferably, the lower mold assembly further includes extension ears fixed to the outer walls at both ends of the lower mold base, a first cylinder is installed at both ends of the bottom of the base, and the output end of the first cylinder is connected to the extension ears.

[0012] Preferably, the lower mold assembly further includes a second guide rod fixed inside the lower mold base, and the mounting plate and the base plate are both slidably mounted via the second guide rod.

[0013] Preferably, the upper mold assembly further includes guide pillars fixed at the four corners of the bottom of the upper mold base, and a cooling pipe installed inside the upper mold base.

[0014] Preferably, the upper mold assembly further includes an injection port installed in the middle of the upper mold base, and a branch channel opened in the upper mold head is connected to the injection port.

[0015] Beneficial effects

[0016] The utility model provides an anti-strain structure based on a deep cavity injection mold. Compared with the existing technology, it has the following advantages:

[0017] (1) When the mold is opened, the first cylinder drives the lower mold assembly to move downward. At the same time, the second cylinder drives the lower inclined block to cooperate with the upper inclined block to drive the top plate to move upward. The top plate drives the ejector pins on the base plate through the vertical rod and the mounting plate to push the molded product into the upper mold assembly. When the ejector pins are retracted and reset, the product falls off the upper mold assembly and is discharged, avoiding the phenomenon of directly ejecting the product after the mold is opened, resulting in uneven pressure on the local surface of the product and whitening.

[0018] (2) The guide rail can improve the stability and smoothness of the movement of the lower inclined block; the mounting plate and the base plate are both slidably mounted through the second guide rod, so that when the mounting plate drives the ejector pin on the base plate to rise and fall, the position is prevented from being offset. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic structural diagram of the anti-strain component in the utility model;

[0021] Figure 3 This is a schematic structural diagram of the lower mold assembly of the utility model;

[0022] Figure 4 This is a structural diagram of the upper mold assembly in the present invention.

[0023] In the figure: 1. base; 2. first guide rod; 3. mold structure; 31. lower mold assembly; 311. lower mold base; 312. extension ear; 313. mounting plate; 314. base plate; 315. ejector pin; 316. second guide rod; 317. lower die head; 318. first cylinder; 32. upper mold assembly; 321. upper mold base; 322. upper die head; 323. guide column; 324. cooling pipe; 325. injection port; 326. diverter; 33. anti-strain assembly; 331. bottom plate; 332. second cylinder; 333. lower inclined block; 334. vertical rod; 335. top plate; 336. upper inclined block; 337. guide rail. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1 - Figure 4 The utility model provides a technical solution: an anti-strain structure based on a deep cavity injection mold, comprising a base 1, a first guide rod 2 fixed at the four corners of the top of the base 1, a mold structure 3 is provided on the first guide rod 2 and is used for injection molding, and the mold structure 3 includes:

[0026] The lower mold assembly 31 includes a lower mold base 311 slidably mounted above the base 1 via the first guide rod 2, a mounting plate 313 slidably mounted at the lower end of the lower mold base 311, a base plate 314 mounted on top of the mounting plate 313, a plurality of ejector pins 315 mounted on the base plate 314, and a lower mold head 317 mounted at the upper end of the lower mold base 311.

[0027] The upper mold assembly 32 includes an upper mold base 321 mounted on the upper end of the lower mold base 311 and an upper mold head 322 mounted on the lower end of the upper mold base 321;

[0028] The anti-strain component 33 includes a base plate 331 fixed to the top of the base 1, a second cylinder 332 installed at one end of the base plate 331, a lower inclined block 333 installed at the output end of the second cylinder 332, a top plate 335 fixed to the lower end of the mounting plate 313 through a vertical rod 334, and an upper inclined block 336 fixed to the bottom of the top plate 335 and cooperating with the lower inclined block 333.

[0029] In this embodiment, when the mold is opened, the lower mold assembly 31 is driven downward by the first cylinder 318. At the same time, the second cylinder 332 drives the lower inclined block 333 to cooperate with the upper inclined block 336 to drive the top plate 335 to move upward. The top plate 335 cooperates with the mounting plate 313 through the vertical rod 334 to drive the ejector pin 315 on the base plate 314 to press the molded product into the upper mold assembly 32. When the ejector pin 315 is retracted and reset, the product falls off from the upper mold assembly 32, avoiding the direct ejection of the product after the mold is opened, resulting in uneven pressure on the local surface of the product and whitening.

[0030] Specifically, the anti-strain component 33 further includes a guide rail 337 fixed to the top of the bottom plate 331 , and the lower inclined block 333 is slidably installed inside the guide rail 337 .

[0031] In this embodiment, the guide rail 337 can improve the stability and smoothness of the lower inclined block 333 during its movement.

[0032] Specifically, the lower mold assembly 31 further includes extension ears 312 fixed to the outer walls at both ends of the lower mold base 311 , and first cylinders 318 are installed at both ends of the bottom of the base 1 , and the output end of the first cylinder 318 is connected to the extension ears 312 .

[0033] In this embodiment, the lower mold assembly 31 is driven to move up and down by the output end of the first cylinder 318, so that when the mold is opened, the upper mold assembly 32 remains stationary and the lower mold assembly 31 moves.

[0034] Specifically, the lower mold assembly 31 further includes a second guide rod 316 fixed inside the lower mold base 311 , and the mounting plate 313 and the base plate 314 are both slidably mounted via the second guide rod 316 .

[0035] In this embodiment, when the mounting plate 313 drives the ejector pins 315 on the base plate 314 to move up and down, position deviation is avoided.

[0036] Specifically, the upper mold assembly 32 further includes guide pillars 323 fixed to the four corners of the bottom of the upper mold base 321 and a cooling pipe 324 installed inside the upper mold base 321 .

[0037] In this embodiment, cooling water circulates through the cooling pipe 324 to remove heat from the mold, thereby lowering the temperature of the mold.

[0038] Specifically, the upper mold assembly 32 further includes an injection port 325 installed in the middle of the upper mold base 321 , and a branch channel 326 opened in the upper mold head 322 and connected to the injection port 325 .

[0039] In this embodiment, after the injection molding machine nozzle is connected to the injection port 325 , the molten plastic is evenly distributed to each cavity of the lower die head 317 through the branch channel 326 .

[0040] The working principle and usage process of the present invention are as follows: First, when the mold is opened, the lower mold assembly 31 is driven downward by the first cylinder 318. At the same time, the second cylinder 332 drives the lower inclined block 333 to cooperate with the upper inclined block 336 to drive the top plate 335 to move upward. The top plate 335 cooperates with the mounting plate 313 through the vertical rod 334 to drive the ejector pin 315 on the base plate 314 to press the molded product into the upper mold assembly 32. When the ejector pin 315 is retracted and reset, the product falls off from the upper mold assembly 32 and is discharged, avoiding the phenomenon that the product is directly ejected after the mold is opened, resulting in uneven pressure on the local surface of the product and whitening.

[0041] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-strain structure based on a deep cavity injection mold, comprising a base (1), a first guide rod (2) fixed at four corners of the top of the base (1), and characterized in that: The first guide rod (2) is provided with a mold structure (3) for injection molding, and the mold structure (3) comprises: The lower mold assembly (31) includes a lower mold base (311) slidably mounted above the base (1) via a first guide rod (2), a mounting plate (313) slidably mounted at the lower end of the lower mold base (311), a base plate (314) mounted on the top of the mounting plate (313), a plurality of ejector pins (315) mounted on the base plate (314), and a lower mold head (317) mounted at the upper end of the lower mold base (311); An upper mold assembly (32) includes an upper mold base (321) mounted on the upper end of the lower mold base (311), and an upper mold head (322) mounted on the lower end of the upper mold base (321); The anti-strain component (33) comprises a bottom plate (331) fixed to the top of the base (1), a second cylinder (332) mounted at one end of the bottom plate (331), a lower inclined block (333) mounted at the output end of the second cylinder (332), a top plate (335) fixed to the lower end of the mounting plate (313) via a vertical rod (334), and an upper inclined block (336) fixed to the bottom of the top plate (335) and cooperating with the lower inclined block (333).

2. The anti-strain structure based on a deep cavity injection mold according to claim 1, characterized in that: The anti-strain component (33) further comprises a guide rail (337) fixed on the top of the bottom plate (331), and the lower inclined block (333) is slidably installed inside the guide rail (337).

3. The anti-strain structure based on a deep cavity injection mold according to claim 1, characterized in that: The lower mold assembly (31) further includes extension ears (312) fixed to the outer walls at both ends of the lower mold base (311), a first cylinder (318) installed at both ends of the bottom of the base (1), and the output end of the first cylinder (318) is connected to the extension ears (312).

4. The anti-strain structure based on a deep cavity injection mold according to claim 1, characterized in that: The lower mold assembly (31) further includes a second guide rod (316) fixed inside the lower mold base (311), and the mounting plate (313) and the base plate (314) are both slidably mounted via the second guide rod (316).

5. The anti-strain structure based on a deep cavity injection mold according to claim 1, characterized in that: The upper mold assembly (32) further includes guide pillars (323) fixed at the four corners of the bottom of the upper mold base (321), and a cooling pipe (324) installed inside the upper mold base (321).

6. The anti-strain structure based on a deep cavity injection mold according to claim 1, characterized in that: The upper mold assembly (32) further includes an injection port (325) installed in the middle of the upper mold base (321), and a branch channel (326) opened inside the upper mold head (322) and connected to the injection port (325).

Images