Split type plasticizing screw mechanism and injection molding machine

Abstract

The utility model discloses a split type plasticizing screw mechanism and an injection molding machine, the split type plasticizing screw mechanism comprises a plasticizing screw, the plasticizing screw is provided with a screw flight section and a screw connecting section which are split, and the screw flight section and the screw connecting section are connected with each other. According to the split type plasticizing screw mechanism and the injection molding machine provided by the utility model, the plasticizing screw is divided into two sections to respectively realize a material conveying function and a transmission connection function, so that the fracture of the screw flight section and the clamping groove of the screw connecting section of the screw can be avoided, and the two sections of plasticizing screws can be configured differently according to requirements, so that a user can prepare goods and store the goods conveniently, and the goods preparation cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of injection molding machine, specifically is a split type plasticizing screw mechanism and injection molding machine. BACKGROUND

[0002] The plasticizing screw on the injection molding machine on the market is a screw structure with integrated design of plasticizing section and connecting section, the rear end of the injection screw is connected with a transmission shaft during the plasticizing process, the rotational speed and torque generated by the plasticizing motor are transmitted to the screw flight part, and the screw flight part converts the granular rubber compound into a molten state and delivers it to the front end of the screw.

[0003] In actual production process, because of the integrated design of the injection screw, the outer diameter of the screw flight part is the same as that of the connecting part, and in order to facilitate disassembly, the connecting size of the rear end of the screw is slightly smaller than the size of the screw flight part. In order to better transport and melt the granular rubber compound, the height of the rear end of the screw flight part is higher than that of the front part of the screw flight, the root diameter of the rear screw flight (position A) is the smallest, and the torsional stress is also the most concentrated, which is prone to breakage during the rubber compound delivery process; similarly, the end of the plasticizing screw needs to be connected and fixed with the transmission shaft, a clamping groove is needed to be opened in the middle position of the end, and the screw is fixed on the transmission shaft by passing the clamping groove with a clamping ring, the bottom diameter of the clamping groove bottom (position B) is also small, which is also prone to torsional stress concentration and breakage; in addition, because different types of screws need to be replaced when producing different types of rubber compounds and different processing technologies, different types of screws need to be prepared when the injection screw is designed integrally, which leads to long delivery period of the screw, high cost of spare parts, and poor universality. Figure 1 Figure 1 Therefore, the above technical problems need to be solved. SUMMARY

[0004] The utility model provides a split type plasticizing screw mechanism and injection molding machine for solving the above technical problems, which has the advantages of simple structure, easy installation, strong universality, low cost of spare parts, and can be applied to injection molding production of various rubber compounds.

[0005] In order to achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A split type plasticizing screw mechanism, comprising a plasticizing screw, the plasticizing screw is provided with a split screw flight section and a screw connecting section, and the screw flight section and the screw connecting section are connected with each other.

[0007] The plasticizing screw of the split type plasticizing screw mechanism is divided into two sections, which respectively realize the functions of material delivery and transmission connection, can avoid the breakage of the clamping groove part of the screw flight section and the screw connecting section, and can be configured differently according to the needs of the two sections of the plasticizing screw, which is convenient for users to store spare parts.

[0008] The plasticizing screw of the split type plasticizing screw mechanism is divided into two sections, which respectively realize the functions of material delivery and transmission connection, can avoid the breakage of the clamping groove part of the screw flight section and the screw connecting section, and can be configured differently according to the needs of the two sections of the plasticizing screw, which is convenient for users to store spare parts. ​

[0009] Further optimization scheme, the end of the screw flight section is provided with outwardly extending flight positioning section, the screw connecting section is provided with concave connecting positioning section, the flight positioning section and the connecting positioning section are clearance fit.

[0010] The clearance fit of the flight positioning section and the connecting positioning section can bring convenience to installation. During operation, the plasticizing screw is heated. Since the screw flight section is close to the heat source, its temperature is higher than that of the screw connecting section. Therefore, the size of the flight positioning section at the end of the screw flight section after thermal expansion is larger than that of the connecting positioning section of the screw connecting section after thermal expansion, so that the clearance fit of the flight positioning section and the connecting positioning section is changed into an over-fit. Under the action of over-fit friction, the screw flight section and the screw connecting section are relatively fixed more firmly and reliably.

[0011] Further optimization scheme, the end of the screw flight section is provided with external thread outwardly extending, the connecting positioning section is provided with internal thread, and the external thread and the internal thread are left-handed threads matched with each other. During the feeding process of the plasticizing screw, the screw flight section performs right-handed rotation. The left-handed external thread of the screw flight section and the internal thread of the screw connecting section are more and more tightly collected during the rotation process.

[0012] Further optimization scheme, the screw flight section and the screw connecting section are made of different materials. According to actual needs, the screw flight section can be made of high-performance material, and the screw connecting section can be made of ordinary material, so that the material cost is further saved while meeting the needs.

[0013] Further optimization scheme, the diameter of the screw flight section is greater than or equal to the diameter of the screw connecting section. According to actual conditions, the screw flight section can be selected to have a thickened size, and the screw connecting section can be selected to have a relatively reduced size, so as to meet different process requirements.

[0014] Further optimization scheme, the diameter of the screw flight section is smaller than the diameter of the screw connecting section. According to actual conditions, the screw flight section can be selected to have a reduced size, and the screw connecting section can be selected to have an increased size, so as to meet different process requirements.

[0015] Further optimization scheme, the split plasticizing screw mechanism further comprises a nozzle, a barrel flange, a barrel, a heating device, a hopper and a front plate of a shooting table; the barrel is installed on the front plate of the shooting table, the barrel flange is installed at the front end of the barrel, and the nozzle is installed on the barrel flange.

[0016] The heating device is arranged around the outside of the barrel, the hopper is arranged on the front plate of the shooting table, the lower port of the hopper is opposite to the feeding port of the barrel, and the screw flight sections are arranged in the barrel and clearance fit with each other.

[0017] Further optimization scheme, the split plasticizing screw mechanism further comprises a transmission shaft, a plasticizing motor, a shooting platform rear plate, a flat key and a snap ring; the screw connecting section is fixed on the transmission shaft through the flat key and the snap ring, the transmission shaft is installed on the shooting platform rear plate, and the plasticizing motor is installed on the shooting platform rear plate and connected with the transmission shaft.

[0018] The plasticizing motor drives the transmission shaft, the screw connecting section and the screw flight section to rotate right, and the rubber material is transported to the front end of the screw flight section, and under the shearing and heating of the screw flight section, the rubber material is changed from granular to molten.

[0019] Further optimization scheme, the split plasticizing screw mechanism further comprises a linear guide rail and a support platform, the shooting platform front plate and the shooting platform rear plate are installed on the linear guide rail and move back and forth along the linear guide rail, and the linear guide rail is fixed on the support platform.

[0020] An injection molding machine comprises the split plasticizing screw mechanism.

[0021] Compared with the prior art, the utility model has the following technical advantages:

[0022] The split plasticizing screw mechanism and the injection molding machine have the advantages of simple structure, convenient installation, strong universality, low spare part cost, and the ability to adapt to the injection molding production of various rubber materials; different screw flight sections and different screw connecting sections can be selected according to different rubber material properties and production processes to meet production requirements; the screw flight sections and the screw connecting sections can also be separately prepared according to production requirements, thereby reducing the spare part cost. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural view of a traditional plasticizing screw;

[0024] Figure 2 is a specific embodiment of the split plasticizing screw mechanism of the utility model;

[0025] Figure 3 is Figure 2 is a structural view of the plasticizing screw in the split plasticizing screw mechanism;

[0026] Figure 4 is Figure 3 is an installation view of the screw flight section and the screw connecting section of the plasticizing screw in the split plasticizing screw mechanism;

[0027] Figure 5 is Figure 2 is a structural view of the screw flight section and the screw connecting section of the plasticizing screw in the split plasticizing screw mechanism using different materials;

[0028] Figure 6This is a schematic diagram of the structure of a split-type plasticizing screw mechanism of the present invention, in which the screw thread section of the plasticizing screw is selected with a thicker diameter and the screw connecting section is selected with a smaller size;

[0029] Figure 7 This is a schematic diagram of a split-type plasticizing screw mechanism of the present invention, in which the screw thread section of the plasticizing screw has a reduced diameter and the screw connecting section has an enlarged size.

[0030] In the diagram: Nozzle 1, Barrel Flange 2, Barrel 3, Heating Device 4, Plasticizing Screw 5, Hopper 6, Front Plate of Injection Unit 7, Drive Shaft 8, Flat Key 9, Snap Ring 10, Rear Plate of Injection Unit 11, Plasticizing Motor 12, Linear Guide Rail 13, Support Platform 14, Rubber Material 15, Screw Rib Section 16, Rib Positioning Section 16a, External Thread 16b, Screw Connecting Section 17, Connecting Positioning Section 17a, Internal Thread 17b. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0032] like Figures 2 to 7 As shown, this utility model provides a specific embodiment of a split-type plasticizing screw mechanism.

[0033] like Figure 3 and Figure 4 As shown, the split plasticizing screw mechanism of this embodiment includes a plasticizing screw 5, which has a split screw thread section 16 and a screw connecting section 17, and the screw thread section 16 and the screw connecting section 17 are connected to each other.

[0034] The split-type plasticizing screw mechanism has a plasticizing screw divided into two sections, which respectively realize the material conveying function and the transmission connection function. This can avoid the breakage of the screw thread part and the screw connection slot part. The two plasticizing screw sections can be configured differently according to needs, which is convenient for users to prepare and store goods.

[0035] like Figure 3 As shown, the end of the screw thread section 16 is provided with an outwardly extending thread positioning section 16a, and the screw connecting section 17 is provided with an inwardly recessed connecting positioning section 17a. The thread positioning section 16a and the connecting positioning section 17a are in clearance fit.

[0036] The clearance fit between the threaded positioning section and the connecting positioning section facilitates installation. During operation, the plasticized screw is heated. Because the threaded section is close to the heat source, its temperature is higher than that of the connecting section. Therefore, the size of the threaded positioning section at the end of the threaded section after thermal expansion is larger than that of the connecting positioning section after thermal expansion. This causes the clearance fit between the threaded positioning section and the connecting positioning section to become an overfit. Under the action of friction from the overfit, the threaded section and the connecting section are relatively more firmly and reliably fixed.

[0037] As shown in Figure 3 the end of the screw flight positioning section 16a extends outwardly and is provided with an external thread 16b, the connecting positioning section 17a is provided with an internal thread 17b, and the external thread 16b and the internal thread 17b are left-handed threads that are matched with each other. The plasticizing screw rotates in a right-handed manner during the conveying of the rubber material, and the left-handed external thread of the screw flight section and the internal thread of the connecting section become tighter during the rotation.

[0038] As shown in Figure 2 the split plasticizing screw mechanism 5 further includes a nozzle 1, a barrel flange 2, a barrel 3, a heating device 4, a hopper 6, and a front plate 7 of the injection table; the barrel 3 is installed on the front plate 7 of the injection table, the barrel flange 2 is installed at the front end of the barrel 3, and the nozzle 1 is installed on the barrel flange 2.

[0039] As shown in Figure 2 the heating device 4 is arranged around the outside of the barrel 3, the hopper 6 is arranged on the front plate 7 of the injection table, the lower end of the hopper 6 is opposite the feeding port of the barrel 3, and the screw flight sections 16 are arranged in the barrel 3 and are gap-matched with each other. The granular rubber material 15 is installed in the hopper 6 and can enter the barrel 3 from the hopper 6, and the plasticizing screw 5 can rotate and convey the rubber material 15 in the barrel 3 and move axially.

[0040] As shown in Figure 2 the split plasticizing screw mechanism 5 further includes a transmission shaft 8, a plasticizing motor 12, a rear plate 11 of the injection table, a flat key 9, and a snap ring 10; the connecting section 17 is fixed to the transmission shaft 8 through the flat key 9 and the snap ring 10, the transmission shaft 8 is installed on the rear plate 11 of the injection table, and the plasticizing motor 12 is installed on the rear plate 11 of the injection table and is connected to the transmission shaft 8.

[0041] The plasticizing motor 12 drives the transmission shaft 8, the connecting section 17, and the screw flight sections 16 to rotate in a right-handed manner, the rubber material 15 is conveyed to the front end of the screw flight sections 16, and the rubber material 15 is changed from a granular state to a molten state under the shearing of the screw flight sections 16 and the heating of the heating device 4.

[0042] As shown in Figure 2 the split plasticizing screw mechanism 5 further includes a linear guide rail 13 and a support platform 14, the front plate 7 of the injection table and the rear plate 11 of the injection table are installed on the linear guide rail 13 and move back and forth along the linear guide rail 13, and the linear guide rail 13 is fixed to the support platform 14.

[0043] As shown in Figure 5 the screw flight sections 16 and the connecting section 17 are made of different materials. According to actual needs, the screw flight sections can be made of high-performance materials, and the connecting section can be made of ordinary materials, so that the requirements are met while the material cost is further saved.

[0044] AsFigure 6 As shown, another size of the plasticizing screw 5, i.e. the diameter of the screw flight section 16 is greater than the diameter of the screw connecting section 17. According to actual conditions, the screw flight section 16 is selected to have a thickened size, and the screw connecting section 17 is selected to have a relatively reduced size, so as to meet different process requirements.

[0045] As shown, the diameter of the screw flight section 16 of the plasticizing screw 5 can also be less than the diameter of the screw connecting section 17. According to actual conditions, the screw flight section 16 is selected to have a reduced size, and the screw connecting section 17 is selected to have an increased size, so as to meet different process requirements. Figure 7

[0046] The utility model discloses still disclose a kind of injection molding machines, including the split type plasticizing screw mechanism of above.

[0047] The split type plasticizing screw mechanism and the plasticizing screw of injection molding machine separate the mode of screw flight section and screw connecting section, because melt glue action screw is all right transmission glue material, this plasticizing screw adopts left-hand thread connection screw flight section and screw connecting section, simultaneously, because the temperature of screw flight section and screw connecting section exists difference in actual production process, leading to the size of screw flight section's screw flight positioning section after heating expansion is greater than the size of the connecting positioning section of screw connecting section, screw flight section and screw connecting section excessive cooperation, so that screw flight section and screw connecting section are relatively fixed;Simultaneously, because the screw flight section and screw connecting section of plasticizing screw are separated, customer can according to own demand individually spare different screw flight section and screw connecting section, reduce customer spare cost, improve response efficiency.

[0048] In conclusion, the utility model as the content of specification and drawing, make actual sample and test after using many times, from the test effect, prove that the utility model can reach the expected purpose, practicality is self-evident. The above-mentioned embodiment is only used to facilitate the content of the utility model, and is not limited in form. Any person skilled in the art without departing from the technical features and similar features of the utility model, equivalent embodiments made by using the disclosed technical content, all belong to the protection scope of the utility model.​

Claims

1. A split plasticizing screw mechanism comprising a plasticizing screw (5), characterized in that: The plasticizing screw (5) is provided with a split screw flight section (16) and a screw connecting section (17), the screw flight section (16) and the screw connecting section (17) are connected with each other; The end of the screw flight section (16) is provided with an outwardly extending flight positioning section (16a), the screw connecting section (17) is provided with a concave connecting positioning section (17a), the flight positioning section (16a) and the connecting positioning section (17a) are in clearance fit.

2. The split plasticizing screw mechanism of claim 1 wherein, The end of the flight positioning section (16a) is provided with an external thread (16b), the connecting positioning section (17a) is provided with an internal thread (17b), the external thread (16b) and the internal thread (17b) are left-handed threads in mutual fit.

3. The split plasticating screw mechanism of claim 1 wherein, The screw flight section (16) and the screw connecting section (17) are made of different materials.

4. The split plasticating screw mechanism of claim 1 wherein, The diameter of the screw flight section (16) is greater than or equal to the diameter of the screw connecting section (17).

5. The split plasticating screw mechanism of claim 1 wherein, The diameter of the screw flight section (16) is less than the diameter of the screw connecting section (17).

6. The split plasticating screw mechanism of claim 1 wherein, It also comprises a nozzle (1), a barrel flange (2), a barrel (3), a heating device (4), a hopper (6) and a front plate (7) of a shooting table, the barrel (3) is installed on the front plate (7) of the shooting table, the barrel flange (2) is installed at the front end of the barrel (3), and the nozzle (1) is installed on the barrel flange (2); The heating device (4) is arranged around the outside of the barrel (3), the hopper (6) is arranged on the front plate (7) of the shooting table, the lower end of the hopper (6) is opposite to the feeding port of the barrel (3), and the screw flight section (16) is arranged in the barrel (3) and in clearance fit with each other.

7. The split plasticating screw mechanism of claim 6 wherein, It also comprises a transmission shaft (8), a plasticizing motor (12), a rear plate (11) of a shooting table, a flat key (9) and a snap ring (10), the screw connecting section (17) is fixed on the transmission shaft (8) through the flat key (9) and the snap ring (10), the transmission shaft (8) is installed on the rear plate (11) of the shooting table, and the plasticizing motor (12) is installed on the rear plate (11) of the shooting table and connected with the transmission shaft (8).

8. The split plasticating screw mechanism of claim 7 wherein, It also comprises a linear guide rail (13) and a support platform (14), the front plate (7) and the rear plate (11) of the shooting table are installed on the linear guide rail (13) and move back and forth along the linear guide rail (13), and the linear guide rail (13) is fixed on the support platform (14).

9. An injection molding machine characterized by: The split plasticizing screw mechanism is provided. The split plasticizing screw mechanism is provided.

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