CN201776902U - Plastic profile stock mold device - Google Patents

Abstract

The utility model provides a shaping die device for plastic profiles, which comprises a connected dry shaping die and a direct cooling vacuum shaping section. The direct cooling vacuum shaping section is composed of an entrance section, a main body section and an exit section. The length of the entrance section and the exit section is They are 1/20~1/30 of the total length of the direct cooling vacuum shaping section, the shape and longitudinal section of the inner cavity of the inlet section are consistent with the shape and longitudinal section of the shaping cavity of the dry calibrating die, and the shape and longitudinal section of the inner cavity of the outlet section are consistent with the The shape of the parison to be processed is suitable, but the longitudinal section is slightly larger than the longitudinal section of the parison to be processed. The longitudinal section of the inner cavity of the main body section is larger than the longitudinal section of the parison. The parison forms a relatively sealed space, and the cooling liquid in the space directly contacts the surface of the parison for cooling, and at the same time, the parison is shaped by the cooling liquid under negative pressure, and finally the parison is solidified into a profile. The cooling efficiency of the device of the utility model is high, and the produced profiles have high surface finish and good quality.

Description

A plastic profile setting mold device

technical field

The utility model relates to a device for molding and cooling the continuously extruded plastic profiles, which belongs to the field of mechanical devices.

Background technique

The molding process of plastic profiles generally includes the following steps: the plastic raw material is plasticized into a melt in the barrel of the extruder, the melt passes through the die of the extruder to form a melt parison of a certain shape, and the melt parison enters the shape The mold is cooled and basically shaped, and then it is continuously cooled by the cooling water tank to form it. There are vacuum holes and cooling holes on the shaping mold. Under the action of vacuum adsorption force, the parison and the shaping mold are in close contact. At the same time, the parison and the shaping mold or the cooling liquid are cooled by heat exchange. In order to prevent the profile from being deformed under the action of traction and in the subsequent cooling process, the parison must be fully cooled and solidified in the shaping mold. Due to the limitation of the structure of the current shaping mold, there are two problems: on the one hand, the rate at which the parison is cooled in the shaping mold is limited. Therefore, in order to make the parison basically solidified and shaped after it comes out of the shaping mold, the pulling speed of the profile must be reduced, or the length of the shaping mold needs to be increased; reducing the pulling speed will definitely affect production efficiency; and the length of the shaping mold cannot be unlimited. Extension, the increase of the length of the shaping mold will increase the resistance during the traction process, resulting in the need to increase the traction force, the excessive traction force will cause the profile to deform; in addition, increasing the length of the shaping mold will increase the production cost and affect the mold accuracy, and at the same time increase the assembly. error. On the other hand, the vacuum adsorption during the cooling and setting process makes the parison and the setting mold closely contact, which will cause stretch marks on the surface of the profile, which will affect the finish and smoothness of the surface of the profile, and may occur during use. Cracking, in order to reduce the surface texture, it is necessary to reduce the roughness of the inner surface of the shaping mold and improve the assembly accuracy of the mold, which greatly increases the manufacturing cost and cumbersome process of the mold. Therefore, the total length of the stereotyped molds used in production generally does not exceed 135cm, the production line speed is 2.5-3.5m/min, and the mold materials and production requirements are relatively high.

The Chinese invention patent with the notification number CN 1069689A discloses a method called "intermittent direct water cooling shaping method". The ring makes the profile directly contact with water intermittently in the mold. In this way, after the profile is extruded from the die, it is firstly cooled and shaped by the first-stage vacuum cooling shaping mold, and then directly cooled by water through the water ring. Then, it is shaped by vacuum adsorption, and then continuously water-cooled and shaped to gradually meet the size and smoothness requirements. Although this method can improve the extrusion method of plastic profiles, improve the dimensional accuracy and smoothness of the product, and reduce the mold cost without affecting the production speed. However, this design still cannot greatly improve the cooling efficiency of the parison, and the surface of the parison will also produce stretch marks or scratches.

The Chinese utility model patent with the notification number CN2594001Y discloses a device called "a plastic shaped bar setting mold device". There are holes or slots communicating with the cavity. In this utility model, the dry-type setting device is designed in the form of a mold casing similar to the shape of the cavity. The mold casing is distributed with seams or holes connected with the cavity, and the mold casing is completely placed in a vacuum water tank to cool it. At the same time, with the negative pressure in the vacuum water tank, the plastic parison and the product are shaped close to the wall of the cavity. Although this design improves the cooling efficiency and cooling uniformity to a certain extent, most of the heat in this design is actually On the other hand, it is still carried out through indirect heat exchange, and its cooling efficiency is limited, so the shaping mold is also longer, which affects the surface quality of the profile.

The Chinese invention patent with the publication number CN101306577A discloses a name called "method and intermediate cooling device for cooling and shaping of continuously extruded plastic products". The patent is to install an intermediate cooling device between the dry shaping die and the wet shaping water tank; The intermediate cooling device is a sealed box. The box is provided with several cooling chambers separated by shaped blocks in the moving direction of the profile, which can lead to and export cooling water. The top of each cooling chamber communicates with the outside of the box Negative pressure sources are connected; the width of each cooling chamber in the moving direction of the profile is equal or increasing, and the width of the first cooling chamber introduced by the profile is not greater than 3mm. This method does not deform the product because the width of each cooling chamber is small, and the product is immersed in cooling water as a whole, so the cooling and shaping efficiency is high, the pulling speed of the profile can be increased, and the total length of the shaping die can be reduced. But this invention must add a special intermediate cooling device, and must use a negative pressure source, which increases the investment of the overall equipment, the structure is relatively complicated, and the surface quality of the profile, especially the appearance, will be affected.

Contents of the invention

In order to solve the above problems that the production speed and surface quality of the continuously extruded plastic profiles are difficult to improve, the utility model provides a plastic profile shaping die device for forming and cooling the continuously extruded plastic profiles. It solves the problems of low cooling efficiency for plastic profiles, poor surface quality of profiles, high requirements for mold making and high investment costs in the prior art.

In order to solve the above-mentioned technical problems, the utility model is realized through the following technical solutions: the plastic profile shaping die device of the utility model includes a dry shaping die of the first section, a direct cooling vacuum shaping section of the second section and a cooling box, directly The cooling vacuum setting section is placed in the cooling box. The dry setting mold includes a setting cavity and a cooling jacket. The shape and longitudinal section of the setting cavity match the shape and longitudinal section of the parison to be processed. The cooling jacket There are inlets and outlets connected with external cooling liquid pipelines; the direct cooling vacuum calibrating section is closely connected with the dry calibrating die, and the direct cooling vacuum calibrating section is composed of an inlet section, a main body section and an outlet section, and is connected with the dry calibrating mold. The closely connected end of the calibrating die is the inlet section, the other end is the outlet section, the main section is between the inlet section and the outlet section, and the lengths of the inlet section and the outlet section are respectively 1/20 to 1/2 of the total length of the direct cooling vacuum calibrating section. 30. The shape and longitudinal section of the inner cavity of the entrance section are consistent with the shape and longitudinal section of the shaping cavity of the dry calibrating die, and the shape of the inner cavity of the outlet section matches the shape of the parison to be processed, but the inner cavity of the outlet section The longitudinal section is slightly larger than the longitudinal section of the parison to be processed, the longitudinal section of the inner cavity of the main body section is larger than the longitudinal section of the parison, and the inlet section, main section and outlet section form a relative seal with the parison with a closed cross section The space is connected with the negative pressure source. Under the action of negative pressure suction, the cooling liquid in the cooling box enters the relatively sealed space through the gap between the flexible rubber material of the outlet section and the surface of the parison. , the parison in this space is soaked in the cooling liquid 2 and is directly cooled, and the cooling liquid 2 in the space is in a negative pressure state. This negative pressure makes the parison with a closed cross section achieve the effect of shaping; after direct cooling Efficient cooling and shaping in the vacuum shaping section, the parison is cooled and shaped to solidify into a profile, and then the profile enters the downstream area and is directly soaked or sprayed by the cooling liquid two to continue cooling.

In the above, the longitudinal section of the inner cavity of the outlet section is 0.5-2mm larger than the longitudinal section of the parison to be processed, so that when the parison passes through the outlet section, the outer surface of the parison is close to but not in contact with the inner cavity of the outlet section.

In the above, the longitudinal section of the inner cavity of the main body section is 1-15 cm larger than the longitudinal section of the parison, so that the main section does not directly contact the outer surface of the parison.

Compared with the prior art, the utility model has the following beneficial effects:

1. The device of the utility model has high cooling efficiency for parisons. Dry calibrating molds and other types of calibrating molds currently used use cooling liquid to cool the parison indirectly. Most of the heat in the parison cooling and shaping process is first transferred to the mould, and then the cooling liquid and the mould. Heat exchange and take away heat, its heat transfer efficiency is low. It uses the flow of water pressure in the mold steel to take away the heat transmitted from the product to the mold steel. In the device of the utility model, the cooling liquid is in direct contact with the parison to exchange heat and take away the heat, so the cooling efficiency is high and the cooling effect is good.

2. The profiles produced by the device of the utility model have high surface finish and good surface quality. During the cooling and shaping process of the parison, the direct contact between the surface of the parison and the hard metal shaping mold will affect the surface quality of the profile. The longer the contact time, that is, the longer the hard metal mold, the worse the surface quality of the profile. In the device of the utility model, the hard metal shaping mold directly in contact with the surface of the parison has only two parts, the first section of the dry shaping mold and the inlet section of the direct cooling vacuum shaping section, and the total length of these two parts only accounts for 1% of the utility model device. 1/6～1/8 of the total length of the cooling and shaping section, and contact when the surface of the parison is not completely solidified, and 5/6～7/8 of the total length of the cooling and shaping section of the utility model is the cooling liquid and the mold. The surface of the billet is in direct contact, therefore, the profile surface has a high degree of smoothness, no stretch marks, good surface quality and beautiful appearance.

3. The device of the utility model has fast traction speed and high production efficiency when producing profiles. In the device of the utility model, most of the length of the cooling and shaping section is in direct contact with the surface of the parison is the cooling liquid, so the cooling efficiency is high and the traction resistance is small, so that it can achieve a relatively fast traction under the action of a small traction force Profiles can be produced at a high speed, and the production line speed can reach 6-8 m/min.

4. In the utility model device, the inlet section, the main section and the outlet section of the direct cooling vacuum shaping section form a relatively sealed space with the parison whose surface is basically solidified and preliminarily shaped, and the cross-section is closed, and the space is connected with the negative pressure source It is directly connected and filled with cooling liquid in a negative pressure state. In this space, the parison is immersed in the cooling liquid. Since the parison in this space has not been completely solidified and shaped, it can be made by this negative pressure. The parison achieves the purpose of shaping.

5. Compared with the dry-type shaping die of the same length or other types of shaping dies currently used, the device of the present utility model uses less manufacturing materials, lower requirements for manufacturing precision and surface roughness, and has a lower total manufacturing cost. Low, simple structure, reasonable design, easy disassembly and maintenance.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a vertical cross-sectional view of Embodiment 1 of the utility model.

Fig. 2 is an exploded view of the longitudinal section of the second embodiment of the utility model.

Fig. 3 is a schematic structural view of the dry setting mold of the present invention.

In the figure: 1. Parison, 2. Dry calibrating mold, 3. Inlet, 4. Outlet, 5. Shaping cavity, 6. Cooling jacket, 7. Inlet section, 8. Main body section, 9. Negative pressure source Connection port, 10. Relatively sealed space, 11. Outlet section, 12. Coolant two, 13. Cooling box, 14. Elastic sealing partition, 15. Coolant spray nozzle, 16. Coolant one, 17, Direct cooling of the vacuum calibrating section.

Detailed ways

Embodiment one:

In conjunction with Fig. 1 and shown in Fig. 3, the first section of the device that realizes the cooling and shaping method for plastic profiles is a dry shaping die 2, which includes a shaping die cavity 5 and a cooling jacket 6, and the shaping die cavity 5 The shape and longitudinal section are adapted to the shape and longitudinal section of the parison to be processed. The parison 1 enters from one end of the shaping cavity 5 and exits from the other end. The upper and lower sides of the cooling jacket 6 are equipped with external cooling The inlet 3 and the outlet 4 connected by the liquid pipeline, the coolant-16 enters the cooling jacket 6 from the inlet 3, and comes out from the outlet 4, under the cooling effect of the coolant-16 in the cooling jacket 6, the parison 1 is cooled in the dry calibrating mold 2, and when the parison 1 leaves the dry calibrating mold 2, its surface has been basically solidified and preliminarily shaped.

The second section of the device is a direct cooling vacuum shaping section 17, which is closely connected with the dry calibrating mold 2. The direct cooling vacuum shaping section is composed of an inlet section 7, a main body section 8 and an outlet section along the advancing direction of the parison during production. 11, one end closely connected with the dry calibrator 2 is the inlet section 7, the other end is the outlet section 11, the main section 8 is between the inlet section 7 and the outlet section 11, and the inlet section 7 and the main section 8 are made of metal materials The outlet section 11 is made of elastic flexible rubber material, the lengths of the inlet section 7 and the outlet section 11 are only 1/20 to 1/30 of the total length of the direct cooling vacuum setting section 17, and the inner cavity of the inlet section 7 The shape and longitudinal section are consistent with the shape and longitudinal section of the shaping cavity 5 of the dry calibrating die 2, and the shape of the inner cavity of the outlet section 11 is adapted to the shape of the parison 1, but the longitudinal section of the inner cavity of the outlet section 11 is larger than the shape of the parison 1. The longitudinal section of the blank 1 is 1.2 mm larger, and the longitudinal section of the inner cavity of the main body section 8 is 5 cm larger than the longitudinal section of the parison 1 .

The method of using the above-mentioned device to realize the cooling and shaping of plastic profiles, the implementation steps are as follows: first, the melt parison 1 enters the first dry shaping mold 2, and under the cooling and shaping of the dry shaping mold 2, the surface of the parison 1 Basically solidified and preliminarily shaped; then, the parison 1 whose surface is basically solidified immediately enters the second section of direct cooling vacuum shaping section 17, the inlet section 7 of the direct cooling vacuum shaping section 17 is in close contact with the surface of the parison 1, and the outlet section 11 is in close contact with the surface of the parison 1. The surface of the parison 1 is close to each other, and its main body section 8 is not in direct contact with the parison 1, so the inlet section 7, the main section 8 and the outlet section 11 of the direct cooling vacuum setting section 17 are basically solidified and preliminarily shaped. The parison 1 with a closed section forms a relatively sealed space 10, which is connected to the negative pressure source through the negative pressure source connection port 9, and under the action of negative pressure suction, the cooling liquid 12 in the cooling box 13 passes through the outlet The gap between the flexible rubber material of the segment 11 and the surface of the parison 1 enters the relatively sealed space 10, and the parison 1 is soaked in the cooling liquid 12 in this space to be directly cooled, and the cooling liquid 12 in the space In a negative pressure state, this negative pressure makes the parison 1 with a closed cross section achieve the effect of shaping; after efficient cooling and shaping, the parison 1 is cooled and solidified into a profile, and the profile then enters the downstream section to be cooled in the box 13 The coolant II 12 is directly soaked for further cooling.

Embodiment two:

As shown in Figure 2 and Figure 3, under the condition that the structure of the dry calibrating mold 2 and the direct cooling vacuum calibrating section 17 remain unchanged in Embodiment 1, the rear section of the device, the upper inner wall and the lower inner wall of the cooling box 13 are provided with The cooling liquid spray nozzle 15, the middle part of the cooling box body 13 is provided with an elastic sealing partition 14, the elastic sealing partition 14 can make the cooling liquid form a sealed space, so that the parison 1 is soaked in the cooling liquid. After the parison 1 is cooled and solidified into a profile by the direct cooling vacuum shaping section 17, it then enters the downstream section and is sprayed by the cooling liquid spray nozzle 15 to continue cooling.

Among the above, the cooling liquid one 16 and the cooling liquid two 12 both use water as the cooling liquid.

The above content is a further detailed description in conjunction with specific main implementation modes, and it cannot be determined that the specific implementation of the utility model is only limited to these descriptions. On the premise of not departing from the concept of the present utility model, other technically accurate and beautifying deductions or replacements made by those skilled in the art shall all belong to the protection scope of the present utility model.

Claims (3)

1. A plastic profile calibrating die device, is characterized in that, comprises the dry calibrating mold of the first section, the direct cooling vacuum calibrating section of the second section and cooling cabinet, and described direct cooling vacuum calibrating section is placed in cooling box In the body, the dry calibrating mold includes a calibrating mold cavity and a cooling jacket, the shape and longitudinal section of the calibrating mold cavity are adapted to the shape and longitudinal section of the parison to be processed, and the cooling jacket is provided with an external cooling liquid The pipeline is connected to the inlet and outlet; the direct cooling vacuum setting section is closely connected with the dry calibrating die, the direct cooling vacuum calibrating section is composed of an inlet section, a main body section and an outlet section, and one end closely connected with the dry calibrating mold It is the inlet section, the other end is the outlet section, and the main section is between the inlet section and the outlet section. The lengths of the inlet section and the outlet section are respectively 1/20 to 1/30 of the total length of the direct cooling vacuum shaping section. The inner cavity of the inlet section The shape and longitudinal section of the cavity are consistent with the shape and longitudinal section of the sizing cavity of the dry calibrating die, and the shape of the inner cavity of the outlet section is suitable for the shape of the parison to be processed, but the longitudinal section of the inner cavity of the outlet section is larger than that to be processed. The longitudinal section of the parison is slightly larger, and the longitudinal section of the inner cavity of the main body section is larger than the longitudinal section of the parison. The inlet section, the main section and the outlet section form a relatively sealed space with the parison with a closed cross section. The negative pressure source is connected. 2. A plastic profile calibrating die device according to claim 1, characterized in that the longitudinal section of the inner cavity of the outlet section is 0.5-2 mm larger than the longitudinal section of the parison to be processed. 3. A plastic profile shaping die device according to claim 1, characterized in that the longitudinal section of the inner chamber of the main body section is 1-15 cm larger than the longitudinal section of the parison.

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