Negative pressure forming die for TPU (thermoplastic polyurethane) protective sleeve

Abstract

The utility model discloses a TPU protective sleeve negative pressure forming die which comprises a die body, an upper forming plate and a lower forming plate are arranged in the die body, a forming cavity is formed between the upper forming plate and the lower forming plate, an air suction hole channel is formed in the die body, one end of the air suction hole channel is communicated with the bottom of the forming cavity, and the other end of the air suction hole channel is communicated with the bottom of the forming cavity. The other end of the air exhaust hole channel is connected with the outside, and the outer end of the air exhaust hole channel is provided with a detection hole site. According to the utility model, air in the forming cavity can be directly pumped out through the air pumping hole channel by arranging the air pumping hole channel, so that negative pressure is formed in the forming cavity, under the action of external force difference, the air trapping risk is reduced, the gas residual grain washing frequency is reduced, the product yield is met, and meanwhile, the mold does not need to be frequently cleaned, and the cleaning cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of mold structure, specifically a negative pressure molding mold for TPU protective sleeves. Background Technology

[0002] Currently, the injection molding of TPU protective sleeves in the industry faces two unresolved issues: trapped air and gas in the mold cavity. Trapped air is generally improved by increasing venting at the perimeter parting surface. However, if the venting is too shallow, the gas cannot be expelled; if the venting is too large, the burrs are difficult to remove, directly affecting production yield. The problem of residual gas is addressed by frequent mold cleaning (every 15-20 days). However, mold cleaning increases mold costs and affects the mold lifespan and appearance of the product. Therefore, a mold cavity vacuuming method has been invented to solve these two existing problems and meet the requirements for yield and quality. Utility Model Content

[0003] The purpose of this invention is to provide a negative pressure molding die for TPU protective sleeves, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a TPU protective sleeve negative pressure molding mold, comprising a mold body, an upper molding plate and a lower molding plate disposed within the mold body, a molding cavity provided between the upper molding plate and the lower molding plate, an air extraction channel disposed within the mold body, one end of the air extraction channel being connected to the bottom of the molding cavity, the other end of the air extraction channel being connected to the outside, and a detection hole being provided at the outer end of the air extraction channel.

[0005] Preferably, the upper forming plate has a front mold core at its bottom and a rear mold core at its top, and a push block is movably connected to the lower forming plate. The accommodating space between the front mold core, the rear mold core, and the push block forms a forming cavity, and the air extraction channel passes through the rear mold core and communicates with the forming cavity.

[0006] Preferably, the mold body is further provided with a feed nozzle, which passes through the front mold core and communicates with the forming cavity.

[0007] Preferably, a sealing ring is provided on the lower forming plate, the sealing ring surrounds the periphery of the rear mold core, and the sealing ring abuts against the upper forming plate.

[0008] Preferably, a second sealing ring is provided between the lower forming plate and the push plate, and the push block can slide relative to the second sealing ring.

[0009] Preferably, the detection hole is used to install a barometric pressure detection device.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] This invention, by setting up an air extraction channel, can directly extract air from the molding cavity, creating a negative pressure in the molding cavity. Under the action of external force difference, it reduces the risk of trapped air, lowers the frequency of residual gas in the mold, and meets the product yield requirements. At the same time, it eliminates the need for frequent mold cleaning, reducing cleaning costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the present invention;

[0014] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] Please see Figures 1 to 3This utility model provides an embodiment of a TPU protective sleeve negative pressure molding mold, including a mold body 10. An upper molding plate 1 and a lower molding plate 2 are disposed within the mold body 10. A molding cavity is provided between the upper molding plate 1 and the lower molding plate 2, and the molding cavity is adapted to the shape of the product. An air extraction channel 3 is provided on the lower molding plate 2. One end of the air extraction channel 3 is connected to the bottom of the molding cavity, and the other end is connected to the outside. The air extraction channel 3 is connected to a vacuum pump via a connecting pipe to create a vacuum inside the molding cavity. A detection hole 4 is provided at the outer end of the air extraction channel 3, and a gas pressure detection device is installed at the detection hole 4. The gas pressure detection device is connected to the connecting pipe, and the gas pressure detection device can detect the gas pressure inside the molding cavity in real time. Under the action of external force difference, the risk of trapped air is reduced, the frequency of residual gas in the cleaning marks is lowered, and the product yield is improved. At the same time, frequent mold cleaning is eliminated, reducing cleaning costs.

[0018] In this embodiment, the bottom of the upper forming plate 1 is provided with a front mold core 5, the top of the lower forming plate 2 is provided with a rear mold core 6, and a push block 7 is movably connected to the lower forming plate 2. The accommodating space between the front mold core 5, the rear mold core 6 and the push block 7 forms a forming cavity. The air extraction channel 3 passes through the rear mold core 6 and communicates with the forming cavity.

[0019] The mold body 1 is also provided with a feed nozzle 8, which passes through the front mold core 5 and is connected to the molding cavity. The feed nozzle 8 is an injection inlet, through which material can be injected into the molding cavity. When vacuuming, the feed nozzle 8 is in a closed state, so that the molding cavity is in a sealed state before vacuuming.

[0020] In this embodiment, a sealing ring 9 is provided on the lower molding plate 2. The sealing ring 9 surrounds the rear mold core 6 and abuts against the upper molding plate 1. The sealing ring 9 can improve the sealing effect between the upper molding plate 1 and the lower molding plate 2.

[0021] In this embodiment, a sealing ring 21 is provided between the lower forming plate 2 and the push plate 7, and the push block 7 can slide relative to the sealing ring 211. The sealing ring 211 can improve the sealing effect between the lower forming plate 2 and the push plate 7.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A TPU protective sleeve negative pressure molding mold, comprising a mold body, characterized in that: The mold body is provided with an upper forming plate and a lower forming plate, and a forming cavity is provided between the upper forming plate and the lower forming plate. The mold body is provided with an air extraction channel, one end of which is connected to the bottom of the forming cavity, and the other end of which is connected to the outside. The outer end of the air extraction channel is provided with a detection hole.

2. The TPU protective sleeve negative pressure molding die according to claim 1, characterized in that: The upper forming plate has a front mold core at its bottom and a rear mold core at its top. A push block is movably connected to the lower forming plate. The space between the front mold core, the rear mold core, and the push block forms a forming cavity. An air extraction channel passes through the rear mold core and communicates with the forming cavity.

3. The TPU protective sleeve negative pressure molding die according to claim 1, characterized in that: The mold body is also equipped with a feed nozzle, which passes through the front mold core and communicates with the forming cavity.

4. The TPU protective sleeve negative pressure molding die according to claim 1, characterized in that: A sealing ring is provided on the lower forming plate. The sealing ring surrounds the periphery of the rear mold core and abuts against the upper forming plate.

5. The TPU protective sleeve negative pressure molding die according to claim 2, characterized in that: A second sealing ring is provided between the lower forming plate and the push plate, and the push block can slide relative to the second sealing ring.

6. The TPU protective sleeve negative pressure molding mold according to claim 1, characterized in that: The detection port is used to install air pressure detection equipment.

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