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CN-121973405-A - Plastic injection mold with exhaust structure

CN121973405ACN 121973405 ACN121973405 ACN 121973405ACN-121973405-A

Abstract

The invention provides a plastic injection mold with an exhaust structure, which comprises an upper mold, a lower mold and a cooling cavity, wherein a mold core is machined at the bottom of the upper mold, a groove for accommodating the mold core is machined at the top of the lower mold, exhaust grooves communicated with the groove are formed in the left side and the right side of the top of the lower mold, the cooling cavity is formed in the lower mold and positioned at the outer side of the groove, and a water inlet pipe and a water outlet pipe communicated with the cooling cavity are respectively connected to the front side and the rear side of the lower mold. The present disclosure belongs to the technical field of injection molds. According to the invention, the exhaust groove communicated with the groove is formed at the top of the lower die, so that a path for exhaust is still reserved after the upper die and the lower die are clamped, air is not remained when products are injection molded, and the exhaust efficiency can be improved by the aid of the auxiliary exhaust component, the condition that air remains in the cavity is effectively avoided, and the quality of injection molded products is further ensured.

Inventors

  • LU CHEN

Assignees

  • 南通同贵模具科技有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (8)

  1. 1. A plastic injection mold with an exhaust structure, comprising: the bottom of the upper die (1) is provided with a die core (4); The lower die (2) is provided with a groove (5) for accommodating the die core (4) at the top, exhaust grooves (6) communicated with the groove (5) are formed in the left side and the right side of the top of the lower die (2), a cooling cavity (7) is formed in the outer side of the lower die (2) and located in the groove (5), a water inlet pipe (8) and a water outlet pipe (9) communicated with the cooling cavity (7) are respectively connected to the front side and the rear side of the lower die (2), an installation groove (10) is formed in the outer side of the cooling cavity (7) and located in the left side and the right side of the lower die (2), and a suction groove (11) communicated with the exhaust grooves (6) is formed in one side, close to the groove (5), of the top of the installation groove (10); Auxiliary exhaust subassembly (3), it sets up in mounting groove (10) for improve the exhaust efficiency of moulding plastics, auxiliary exhaust subassembly (3) are including piston (31), communicating pipe (32) and elastic component (33), and piston (31) slip sets up in mounting groove (10), and a plurality of spread grooves (12) have been seted up to one side that piston (31) is close to cooling chamber (7), all have communicating pipe (32) through elastic component (33) sliding connection in spread groove (12), and one side that piston (31) was kept away from to communicating pipe (32) stretches into in cooling chamber (7).
  2. 2. The plastic injection mold with the exhaust structure according to claim 1, wherein the elastic member (33) comprises a supporting frame (331) and a tension spring (332), the supporting frame (331) is fixedly connected to one side of the communicating pipe (32) close to the cooling groove, and one side of the supporting frame (331) close to the piston (31) is connected with the piston (31) through the tension spring (332).
  3. 3. The plastic injection mold with the exhaust structure according to claim 2, characterized in that a chute (13) is obliquely and downwards arranged on one side of the exhaust groove (6) close to the groove (5) in a direction away from the groove (5), and a trimming block (14) for cutting off flash is slidably connected in the chute (13).
  4. 4. A plastic injection mould with an exhaust structure according to claim 3, characterized in that, a containing groove (15) is vertically opened downwards on one side of the exhaust groove (6) close to the air suction groove (11), a top block (16) for jacking up the trimming block (14) is placed in the containing groove (15), an extrusion part (17) contacted with the top of the piston (31) is formed on one side of the top block (16) close to the piston (31) in a protruding way, and a guiding surface (18) for pushing the slicing block to move is processed on the top of the top block (16).
  5. 5. The plastic injection mold with the exhaust structure according to claim 4, wherein an adjusting groove (19) is formed in one side, close to the water outlet pipe (9), of the top of the lower mold (2), an adjusting block (21) is connected in the adjusting groove (19) through a supporting spring (20), and the bottom of the adjusting block (21) stretches into the water outlet pipe (9) to adjust the water outlet cross section.
  6. 6. A plastic injection mould with a venting structure according to claim 5, characterized in that the outer wall of the piston (31) is provided with a plurality of annular grooves (22) at intervals, and sealing rings (23) contacting the mounting grooves (10) are fixedly connected in the annular grooves (22).
  7. 7. The plastic injection mold with the exhaust structure according to claim 6, wherein an anti-drop ring (24) is fixedly connected to an opening position of the mounting groove (10), and a cushion pad (25) is fixedly connected to one side of the anti-drop ring (24) close to the piston (31).
  8. 8. The plastic injection mold with the exhaust structure according to claim 7, wherein a positioning groove (26) is formed in the outer wall of the communicating pipe (32), a sealing ring (27) is connected in the positioning groove (26), and the outer wall of the sealing ring (27) is abutted against the inner wall of the connecting groove (12).

Description

Plastic injection mold with exhaust structure Technical Field The disclosure belongs to the technical field of injection molds, and particularly relates to a plastic injection mold with an exhaust structure. Background The plastic injection mould is a core tool for plastic injection molding, and is a precise production device for manufacturing plastic parts with complex shapes in batches and high efficiency. The value of the method is far higher than that of an injection molding machine, and the design and manufacturing level of the mold directly determines the quality, cost and production efficiency of the final product. In the prior art, when molten plastic is injected into a cavity at a high speed in the injection molding process, the original air in the cavity and a small amount of gas possibly generated by the decomposition of the plastic per se must be discharged. If these gases cannot be exhausted in time, they are compressed at high speed and trapped in the cavity, resulting in a series of product quality problems. Disclosure of Invention In order to solve the above problems, the present invention provides a plastic injection mold having an exhaust structure, comprising: The bottom of the upper die is provided with a die core; The lower die is characterized in that a groove for accommodating a die core is processed at the top of the lower die, exhaust grooves communicated with the groove are formed in the left side and the right side of the top of the lower die, a cooling cavity is formed in the lower die and positioned at the outer side of the groove, a water inlet pipe and a water outlet pipe communicated with the cooling cavity are respectively connected to the front side and the rear side of the lower die, mounting grooves are formed in the left side and the right side of the lower die and positioned at the outer side of the cooling cavity, and an air suction groove communicated with the exhaust grooves is formed in one side, close to the groove, of the top of the mounting groove; the auxiliary exhaust assembly is arranged in the mounting groove and used for improving injection molding exhaust efficiency, the auxiliary exhaust assembly comprises a piston, a communicating pipe and an elastic piece, the piston is slidably arranged in the mounting groove, a plurality of connecting grooves are formed in one side, close to the cooling cavity, of the piston, the connecting grooves are slidably connected with the communicating pipe through the elastic piece, and one side, far away from the piston, of the communicating pipe extends into the cooling cavity. Further, the elastic piece comprises a supporting frame and a tension spring, the supporting frame is fixedly connected to one side, close to the cooling groove, of the communicating pipe, and one side, close to the piston, of the supporting frame is connected with the piston through the tension spring. Further, a chute is obliquely downwards arranged on one side of the exhaust groove, which is close to the groove, in a direction away from the groove, and a trimming block for cutting off overflows is slidably connected in the chute. Further, the exhaust groove is close to one side of the air suction groove is vertically downwards provided with a containing groove, a jacking block used for jacking up the trimming block is placed in the containing groove, one side of the jacking block, which is close to the piston, is protruded to form an extrusion part in contact with the top of the piston, and the top of the jacking block is provided with a guide surface used for pushing the slicing block to move. Further, an adjusting groove is formed in one side, close to the water outlet pipe, of the top of the lower die, an adjusting block is connected in the adjusting groove through a supporting spring, and the bottom of the adjusting block stretches into the water outlet pipe and is used for adjusting the water outlet cross section. Further, a plurality of annular grooves are formed in the outer wall of the piston at intervals, and sealing rings in contact with the mounting grooves are fixedly connected in the annular grooves. Further, an anti-drop ring is fixedly connected to the opening of the mounting groove, and a buffer pad is fixedly connected to one side of the anti-drop ring, which is close to the piston. Furthermore, the external wall of communicating pipe has seted up the constant head tank, and the constant head tank interconnect has the sealing washer, the external wall of sealing washer with the inner wall of spread groove is contradicted. In summary, the present invention includes at least one of the following beneficial technical effects: 1. According to the plastic injection mold with the exhaust structure, the exhaust groove communicated with the groove is formed in the top of the lower mold, so that a path for exhaust exists after the upper mold and the lower mold are clamped, air is not remained when a product is injection molded, the exhaust