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CN-122008489-A - Double-color injection mold and injection molding method for producing milk powder can cover

CN122008489ACN 122008489 ACN122008489 ACN 122008489ACN-122008489-A

Abstract

The invention relates to the technical field of injection molds, in particular to a double-color injection mold and an injection molding method for producing a milk powder can cover. The mold realizes synchronous injection molding of hard rubber and soft rubber through the double-molding station cooperative rotating mechanism, is matched with the gradient water circulation cooling mechanism, realizes differential temperature control and continuous circulation of cooling water in the rotating process, integrates the functions of water path self-cleaning, leakage detection and waste heat recovery, solves the problems of low production efficiency, multiple product molding defects, single function of a cooling system and the like of the traditional double-color injection molding, greatly improves the molding precision, sealing performance and production efficiency of the milk powder can cover, and reduces production energy consumption and maintenance cost.

Inventors

  • CHEN GUANGFENG
  • HUANG JINDONG

Assignees

  • 嘉美塑料制品（珠海）有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. A double-shot injection mold for producing milk powder cover, characterized by comprising: The first mould shell is internally embedded with a front mould core; The second mould shell can slide along the horizontal left-right direction and is arranged on the right side of the first mould shell, a rear mould core is embedded in the second mould shell, the front mould core and the rear mould core are closed after being closed to form a forming cavity of the double-color milk powder can cover, and the front mould core is provided with two forming stations which are distributed in a central symmetry mode; the soft rubber hot runner component and the hard rubber hot runner component are respectively arranged in the first mould shell in a penetrating way and are vertically distributed in space and are respectively communicated with two forming stations of the front mould core in a one-to-one correspondence way; The ejection mechanism is arranged in the first mould shell and is in transmission connection with the front mould core, and is used for synchronously ejecting the front mould core, the formed bicolor milk powder tank cover and the soft rubber pouring gate; The rotary transposition mechanism is arranged in the first mould shell and fixedly connected with the front mould core, and is used for driving the front mould core to rotate and transpose after being ejected rightwards so that the spatial positions of the two forming stations are mutually exchanged; The gradient type water circulation cooling system is arranged inside the first mould shell, the front mould core and the rear mould core in a penetrating mode and comprises a front mould cooling module, a rear mould cooling module, a cooling water regulation and control module and a waste heat recovery module, wherein the front mould cooling module is matched with the front mould core, the rear mould cooling module is matched with the rear mould core, the front mould cooling module and the rear mould core are communicated with the cooling water regulation and control module, and the waste heat recovery module is connected with the water outlet end of the cooling water regulation and control module to recycle the heat energy of the cooling water.
  2. 2. The double-colored injection mold for producing milk powder can lids of claim 1, wherein the front mold cooling module comprises a first cooling water channel, a second cooling water channel, a rotary annular communication interface and a station independent cooling branch, the first cooling water channel is arranged inside the sliding seat, the second cooling water channel is arranged along the axis direction of the rotary main shaft, the second cooling water channel and the rotary main shaft are communicated through the rotary annular communication interface, double-layer sealing rubber rings are arranged on two sides of the rotary annular communication interface, the two station independent cooling branch are respectively matched with two molding sites of the front mold core, and the water channel diameter and the water flow rate of the two station independent cooling branch can be independently adjusted.
  3. 3. The double-shot injection mold for producing milk powder can lids of claim 1, wherein the rear mold cooling module comprises a rear mold main cooling water path, a mold cavity attaching type cooling flow hole and a heat insulation layer, the mold cavity attaching type cooling flow hole is arranged on one side of the rear mold core, which is close to the forming cavity, and is communicated with the rear mold main cooling water path, and the heat insulation layer is arranged at the attaching face of the rear mold core and the second mold shell and is used for reducing the cooling capacity loss of the rear mold cooling module.
  4. 4. The double-color injection mold for producing the milk powder tank cover according to claim 1, wherein the cooling water regulation and control module comprises a constant-temperature water storage tank, a variable-frequency booster water pump, a waterway switching valve group, an automatic cleaning assembly and a leakage detection assembly, the variable-frequency booster water pump is communicated with the constant-temperature water storage tank and is used for regulating the conveying pressure and the flow rate of cooling water, the waterway switching valve group is respectively connected with a front mold cooling module and a rear mold cooling module and is used for realizing independent on-off and flow precise regulation of a front mold cooling waterway and a rear mold cooling waterway, the automatic cleaning assembly is used for automatically flushing and descaling the waterway of the whole water circulation cooling system, and the leakage detection assembly is arranged at each connecting node of the waterway and is used for detecting the leakage state of the waterway in real time and sending out an early warning signal.
  5. 5. The double-shot injection mold for producing a milk powder can lid according to claim 4, wherein the automatic cleaning assembly comprises a high-pressure flushing pump, a detergent quantitative storage box and a blowdown valve set, the high-pressure flushing pump is communicated with the constant-temperature water storage tank, the detergent quantitative storage box is connected with a water inlet end of the high-pressure flushing pump, and the blowdown valve set is arranged at the tail end of each cooling waterway and used for discharging sewage and impurities after flushing.
  6. 6. The double-shot injection mold for producing milk powder can lids of claim 4, wherein the leak detection assembly comprises a pressure sensing module, a liquid level sensing module and an audible and visual alarm module, the pressure sensing module is arranged on a conveying pipeline of each cooling waterway, the liquid level sensing module is arranged in a liquid receiving groove of a rotary annular communication interface and a double-layer sealing rubber ring, and the pressure sensing module and the liquid level sensing module are electrically connected with the audible and visual alarm module.
  7. 7. The double-color injection mold for producing the milk powder can cover according to claim 1, wherein the waste heat recovery module comprises a heat exchange water storage tank, a tubular heat exchange assembly and a hot water conveying pipeline, the tubular heat exchange assembly is respectively communicated with the water outlet end of the cooling water regulation and control module and the heat exchange water storage tank and is used for transferring waste heat in cooling water to cold water in the heat exchange water storage tank, and the hot water conveying pipeline is communicated with the heat exchange water storage tank and is used for conveying preheated hot water to heating matched equipment of injection molding equipment.
  8. 8. The double-color injection mold for producing the milk powder can cover according to claim 1, wherein two groups of stations of the front mold cooling module are independent cooling branches, are respectively matched with a soft rubber injection molding station and a hard rubber injection molding station, the water flow rate of the cooling branch corresponding to the soft rubber injection molding station is higher than that of the cooling branch corresponding to the hard rubber injection molding station, and a cooling waterway of the soft rubber injection molding station is attached to the inner side wall of a soft rubber molding area of the milk powder can cover.
  9. 9. Injection molding method for a two-shot injection mold for producing a milk powder can lid, which can be implemented on a mold according to any one of claims 1 to 8, characterized by comprising the steps of: S100, starting a gradient water circulation cooling system, starting a variable-frequency booster water pump of a cooling water regulation and control module, conveying cooling water in a constant-temperature water storage tank to a front mold cooling module and a rear mold cooling module, and regulating the flow of cooling waterways of a front mold and a rear mold through a waterway switching valve group so that a soft rubber injection station, a hard rubber injection station and a rear mold core respectively reach preset cooling temperature and water flow rate; S200, respectively adding a hard rubber raw material and a soft collagen material into a charging barrel of corresponding injection molding equipment through an automatic charging machine, after plasticizing the raw materials, closing the mold, injecting hard rubber at a molding station of the lower half part of a front mold core to form a can cover substrate, injecting soft rubber at a molding station of the upper half part of the front mold core to form a sealing layer, obtaining a bicolor milk powder can cover finished product, continuously performing differential gradient cooling through a gradient water circulation cooling system in the injection molding process, and synchronously recovering waste heat of cooling water through a waste heat recovery module; S300, opening the mold after injection molding pressure maintaining is completed, so that the first mold shell and the second mold shell are separated from each other, the front mold core and the rear mold core are driven to be separated, and the front mold cooling module keeps continuous circulation of cooling water through the rotary annular communication interface in the mold opening process; S400, the second driving oil cylinder and the third driving oil cylinder are synchronously started, the front mold core is ejected, the finished product of the double-color milk powder can cover and the soft rubber pouring gate formed on the upper half part of the front mold core are ejected, and the mechanical arm stretches into the taking area to take out the finished product of the double-color milk powder can cover and the soft rubber pouring gate; S500, a first driving oil cylinder drives a meshing rack to move, a front mold core is driven to rotate 180 degrees through gear-rack meshing transmission, a rotary annular communication interface of a front mold cooling module synchronously rotates along with a rotary main shaft in the rotating process, cooling water circulation is kept uninterrupted, and two groups of station independent cooling branches exchange synchronous switching cooling parameters along with the position of a forming station; S600, the second driving oil cylinder and the third driving oil cylinder act reversely to drive the thimble assembly and the front mold core to reset, mold the mold again and repeat the steps S200-S500, so that continuous injection molding production of the double-color milk powder can cover is realized; S700, when the equipment is stopped or periodically maintained, an automatic cleaning assembly is started, a scale remover is quantitatively added into a cooling waterway and high-pressure flushing is carried out through a high-pressure flushing pump, the flushed sewage is discharged through a sewage discharge valve group, and meanwhile, leakage detection is carried out on each node of the waterway through a leakage detection assembly.
  10. 10. The injection molding method of a two-color injection mold for producing a milk powder can lid according to claim 9, wherein in step S100-S600, the leak detection assembly detects the water path operation state in real time in the whole process, if the water path pressure abnormality or the liquid level of the liquid receiving tank exceeding the standard is detected, the audible and visual alarm module immediately sends out audible and visual alarm, and meanwhile, the cooling water regulation module controls the variable-frequency booster water pump to stop and closes the water path switching valve group.

Description

Double-color injection mold and injection molding method for producing milk powder can cover Technical Field The invention relates to the technical field of injection molds, in particular to a double-color injection mold and an injection molding method for producing a milk powder can cover. Background The double-color milk powder can cover is used as a core component of infant milk powder package, adopts a double-material structural design that the outer hard glue provides structural support and the inner soft glue ensures sealing performance, and has extremely high requirements on the molding precision, sealing performance, size consistency and production efficiency of products. At present, the injection molding production of the bicolor milk powder can cover adopts a secondary injection molding process, the mold needs to be opened and closed twice, and the mold orientation is adjusted by matching with a mechanical arm or the mold is integrally rotated to finish bicolor molding, so that the device has the advantages of huge volume, large occupied production space, complex production flow and low production efficiency. Meanwhile, the existing double-color injection mold has a plurality of technical defects in practical application, such as that a cooling system is designed by adopting a unified waterway, differential gradient temperature control cannot be performed according to different material characteristics and molding process requirements of soft rubber and hard rubber, the problems of inconsistent molding shrinkage rate, warp deformation, obvious weld marks and the like of products are easily caused, the sealing performance and the dimensional accuracy of a milk powder can cover are difficult to ensure, in addition, in the rotating transposition process of a front mold core, the cooling waterway is easy to be subjected to circulation interruption, continuous cooling cannot be realized, the molding period of the products is prolonged, and the stability of the batch molding quality of the products is also influenced. Disclosure of Invention In order to solve the above technical problems, the present invention provides a two-color injection mold for producing a milk powder can lid, comprising: The first mould shell is internally embedded with a front mould core; The second mould shell can slide along the horizontal left-right direction and is arranged on the right side of the first mould shell, a rear mould core is embedded in the second mould shell, the front mould core and the rear mould core are closed after being closed to form a forming cavity of the double-color milk powder can cover, and the front mould core is provided with two forming stations which are distributed in a central symmetry mode; the soft rubber hot runner component and the hard rubber hot runner component are respectively arranged in the first mould shell in a penetrating way and are vertically distributed in space and are respectively communicated with two forming stations of the front mould core in a one-to-one correspondence way; The ejection mechanism is arranged in the first mould shell and is in transmission connection with the front mould core, and is used for synchronously ejecting the front mould core, the formed bicolor milk powder tank cover and the soft rubber pouring gate; The rotary transposition mechanism is arranged in the first mould shell and fixedly connected with the front mould core, and is used for driving the front mould core to rotate and transpose after being ejected rightwards so that the spatial positions of the two forming stations are mutually exchanged; The gradient type water circulation cooling system is arranged inside the first mould shell, the front mould core and the rear mould core in a penetrating mode and comprises a front mould cooling module, a rear mould cooling module, a cooling water regulation and control module and a waste heat recovery module, wherein the front mould cooling module is matched with the front mould core, the rear mould cooling module is matched with the rear mould core, the front mould cooling module and the rear mould core are communicated with the cooling water regulation and control module, and the waste heat recovery module is connected with the water outlet end of the cooling water regulation and control module to recycle the heat energy of the cooling water. In some possible embodiments, the front mold cooling module comprises a first cooling water channel, a second cooling water channel, a rotary annular communication interface and station independent cooling branches, wherein the first cooling water channel is arranged inside the sliding seat, the second cooling water channel is arranged along the axis direction of the rotary main shaft, the first cooling water channel and the second cooling water channel are communicated through the rotary annular communication interface, two sides of the rotary annular communication interface are respectively provided with a d