Reinforced exhaust charging barrel for injection molding machine

Abstract

The utility model provides a reinforced exhaust charging barrel for an injection molding machine, which relates to the technical field of injection molding machines, and comprises a screw discharging mechanism for extruding and conveying raw materials, the screw discharging mechanism comprises a charging barrel and a discharging screw inside the charging barrel, a dehumidification mechanism is arranged in the middle of the charging barrel, the dehumidification mechanism comprises a dehumidification charging barrel, and the dehumidification charging barrel is provided with an exhaust port. The dehumidification charging barrel is a component internally provided with a cylindrical through hole, one end of the dehumidification charging barrel is communicated with the middle of the charging barrel, a pressure relief hole is further formed between the dehumidification charging barrel and the charging barrel, an exhaust hole is formed in the position, close to the top, of the dehumidification charging barrel, and the separation screw rotates in the dehumidification charging barrel and is coaxially arranged in the dehumidification charging barrel. The separation screw is used for separating raw materials and water vapor and extruding and conveying the raw materials to return to the charging barrel. The device has the advantages that raw materials and water vapor in injection molding raw materials can be effectively separated, the separation and removal effect of the water vapor is improved, meanwhile, waste of the raw materials is reduced, and the influence on the production cycle and the production quality of injection molding products is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a reinforced exhaust barrel for injection molding machines. Background Art

[0002] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment for injecting hot-melt plastic raw materials into molding molds to make plastic products of various shapes. With the acceleration of the pace of modernization, injection molding machines have been widely used in various sectors of the national economy and various fields of people's lives, such as construction, packaging, electrical and electronic equipment, agriculture, automobiles, transportation, light industry, petrochemical industry, machinery industry, and national defense industry, showing an extremely important role.

[0003] Injection molding and extrusion molding are important plastic processing methods. During the molding process, plastic particles or powders are usually put into the barrel from the hopper. The outer wall of the traditional barrel is provided with a heating plate, and the barrel is provided with a screw that can slide along the barrel. The screw transports the plastic particles to the front section of the barrel by rotation, and the barrel is heated by the heating plate to raise its temperature to the melting temperature of the plastic. The rotation of the screw continuously delivers the molten plastic to the discharge end of the barrel for extrusion and injection molding.

[0004] In the existing related technologies, since the unbaked raw materials will generate water vapor when they are heated to a molten state for extrusion and transportation, in order to discharge the water vapor, exhaust holes are usually opened on the barrel to discharge the generated water vapor. When the water vapor is discharged, part of the raw materials in a molten state will also be discharged. The existing related technologies have the problems of wasting raw materials and a low dehumidification rate, which affects the production cycle and product quality of the product. Utility Model Content

[0005] In view of the deficiencies in the prior art, the present invention provides a reinforced exhaust barrel for an injection molding machine, which solves the problems of waste of raw materials, low dehumidification rate and impact on product production cycle and product quality in the injection molding process of the prior art.

[0006] According to an embodiment of the utility model, a reinforced exhaust barrel for an injection molding machine includes a screw discharging mechanism for extruding and conveying raw materials, wherein the screw discharging mechanism includes a barrel and a discharging screw coaxially and rotatably arranged inside the barrel, a dehumidification mechanism is arranged in the middle of the barrel, the dehumidification mechanism includes a dehumidification barrel, the dehumidification barrel is a component with a cylindrical through hole arranged inside, one end of the dehumidification barrel is connected to the middle of the barrel, at least one connected pressure relief hole is also arranged between the dehumidification barrel and the barrel, an exhaust hole connected to the interior of the dehumidification barrel is opened near the top, a separation screw rotates inside the dehumidification barrel and is coaxially arranged inside the dehumidification barrel, the separation screw is used to separate raw materials and water vapor, and is also used to extrude and convey the raw materials back to the barrel, and a driving unit for driving the separation screw to rotate along its own axis is installed on the dehumidification barrel.

[0007] Through the above technical scheme, when the device is used for injection molding, the water vapor and part of the raw materials discharged from the barrel of the screw discharge mechanism will enter the dehumidification barrel, and the raw materials and water vapor will be separated under the rotation of the separation screw, and the water vapor will be discharged through the exhaust hole at the top of the dehumidification barrel. The raw materials are squeezed into the barrel under the action of the separation screw and transported again to continue injection molding. This structure can effectively separate and remove the water vapor in the raw material, while also reducing the waste of raw materials and reducing the impact on the production cycle and production quality of injection molded products.

[0008] Preferably, the dehumidification mechanism is arranged toward the feeding end of the screw discharge mechanism, and the directions in which the screw discharge mechanism and the dehumidification mechanism extrude and convey the raw materials form an acute angle.

[0009] Through the above technical scheme, the screw discharge mechanism and the dehumidification mechanism are set to an acute-angle structure, which can facilitate the raw materials separated in the dehumidification barrel to enter the barrel again, prevent excessive accumulation of raw materials in the dehumidification barrel from overflowing or even clogging the exhaust holes, thereby improving the reliability and practicality of the device.

[0010] Preferably, the dehumidification mechanism is arranged directly above the screw discharge mechanism.

[0011] Through the above technical solution, since the gas has a tendency to move upward after being heated, arranging the dehumidification mechanism just above the screw discharge mechanism can more conveniently and effectively discharge the water vapor generated by the raw materials in the barrel, further improving the practicality and reliability of the device.

[0012] Preferably, a cooling element is provided on the top of the dehumidifying barrel, and cooling holes for circulating coolant are provided in the cooling element.

[0013] Through the above technical scheme, the cooling element can be conveniently connected to the circulating coolant to cool the top of the dehumidification barrel, preventing the raw materials entering the dehumidification barrel from transferring heat to other components such as the drive unit and causing damage to them. At the same time, it ensures that the raw materials in the dehumidification barrel still maintain a high temperature and have a certain fluidity, which is convenient for being transferred to the barrel again, further improving the reliability and practicality of the device.

[0014] Preferably, the discharging screw includes two coaxially arranged conveying screws, each of which includes a feeding section and a compression and homogenization section. A separation feed hole is provided on the barrel, and the separation feed hole is provided at the connection between the two conveying screws. The dehumidification mechanism is installed at the separation feed hole, and the separation feed hole and the separation screw are coaxially arranged.

[0015] Through the above technical scheme, by utilizing the structure in which the minor diameter of the feeding section of the conveying screw is smaller than the minor diameter of the compression and homogenization section, when conveying raw materials, the pressure at the connection between the two sections of the conveying screw will be reduced, and the water vapor generated by the heating of the raw materials will be more easily discharged through the pressure relief hole near this position, thereby improving the discharge effect of the water vapor.

[0016] Preferably, a stepped hole is provided at the top of the dehumidification barrel, and a self-aligning bearing for mounting a separation screw is provided in the stepped hole.

[0017] Through the above technical solution, by utilizing the stepped hole arranged on the dehumidification barrel and the self-aligning bearing arranged inside it, the separation screw can have the functions of centering and limiting, thereby preventing the separation screw from getting stuck and improving the reliability of the device.

[0018] Preferably, one end of the pressure relief hole is communicated with the interior of the barrel, and the other end is communicated with the interior of the separation feed hole.

[0019] Through the above technical solution: the pressure relief hole is connected with the separation hole and the face of the barrel, so that the structure of the device can be simplified and the processing process of the device can be more convenient.

[0020] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0021] 1. When the device is used for injection molding, the water vapor and part of the raw materials discharged from the barrel of the screw discharge mechanism will enter the dehumidification barrel. Under the rotation of the separation screw, the raw materials and water vapor are separated, and the water vapor is discharged through the exhaust hole on the top of the dehumidification barrel. The raw materials are squeezed and moved into the barrel under the action of the separation screw and transported again to continue injection molding. This structure can effectively separate and remove the water vapor in the raw materials, and at the same time reduce the loss of raw materials, so as to reduce the impact on the production cycle and production quality of injection molding products;

[0022] 2. The cooling element can be used to conveniently connect the circulating coolant to cool the top of the dehumidification barrel, preventing the raw materials entering the dehumidification barrel from transferring heat to other components such as the drive unit and causing damage to them. At the same time, it ensures that the raw materials in the dehumidification barrel still maintain a high temperature and have a certain fluidity, which is convenient for re-transfer to the barrel, further improving the reliability and practicality of the device;

[0023] 3. By utilizing the structure in which the minor diameter of the feeding section of the conveying screw is smaller than the minor diameter of the compression and homogenization section, the pressure at the connection between the two sections of the conveying screw will be reduced when conveying raw materials, and the water vapor generated by the heating of the raw materials will be more easily discharged through the pressure relief hole near this position, thereby improving the discharge effect of the water vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of this application;

[0025] Figure 2 for Figure 1 Enlarged view of part A.

[0026] In the above drawings:

[0027] 1. Screw discharge mechanism; 11. Barrel; 111. Separation feed hole; 12. Discharge screw; 121. Feeding section; 122. Compression homogenization section; 13. Discharge unit; 14. Feed port;

[0028] 2. Dehumidification mechanism; 21. Dehumidification barrel; 211. Exhaust hole; 22. Separation screw; 23. Driving unit; 24. Cooling element; 241. Cooling hole; 25. Self-aligning bearing;

[0029] 3. Pressure relief hole. DETAILED DESCRIPTION

[0030] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0031] A reinforced exhaust barrel for an injection molding machine, referring to Figure 1-Figure 2 , including a screw discharge mechanism 1 for extruding and conveying raw materials, the screw discharge mechanism 1 includes a barrel 11 and a discharge screw 12 coaxially and rotatably arranged inside the barrel 11, the discharge screw 12 includes two sections of coaxially arranged conveying screws, each section of the conveying screw includes a feeding section 121 and a compression homogenization section 122, and the minor diameter of the feeding section 121 of the conveying screw is smaller than the minor diameter of the compression homogenization section 122. The barrel 11 is a cylindrical component, and a cylindrical material hole is coaxially arranged inside the barrel, and the material hole is used to convey the injection molding raw materials in a molten state. A discharge unit 13 is arranged at one end of the barrel 11, and the discharge unit 13 is a prior art. A feed port 14 is arranged at the other end of the barrel 11.

[0032] A dehumidification mechanism 2 is arranged in the middle of the barrel 11. The dehumidification mechanism 2 is arranged directly above the screw discharging mechanism 1. The dehumidification mechanism 2 includes a dehumidification barrel 21. The dehumidification barrel 21 is a component with a cylindrical through hole arranged inside. One end of the dehumidification barrel 21 is connected with the middle of the barrel 11. At least one connected pressure relief hole 3 is also arranged between the dehumidification barrel 21 and the barrel 11. The diameter and number of the pressure relief holes 3 can be made according to needs. Three pressure relief holes are arranged here.

[0033] An exhaust hole 211 connected to the interior of the dehumidification barrel 21 is provided near the top thereof, and a separation screw 22 is coaxially arranged inside the dehumidification barrel 21 and rotates therein. The separation screw 22 is used to separate the raw material and water vapor, and is also used to extrude and convey the raw material back to the barrel 11. A driving unit 23 for driving the separation screw 22 to rotate along its own axis is installed on the dehumidification barrel 21. According to needs, the driving unit 23 can be a power device using electricity, hydraulic pressure, or air pressure as a driving source, such as an electric motor, a hydraulic motor, a pneumatic motor, etc.

[0034] In order to facilitate the dehumidification mechanism 2 to transport the raw materials into the barrel 11 again, a separation feed hole 111 is provided on the barrel 11. The separation feed hole 111 is provided at the connection between the two sections of the conveying screw. The dehumidification mechanism 2 is installed at the separation feed hole 111. The separation feed hole 111 and the separation screw 22 are coaxially arranged.

[0035] One end of the pressure relief hole 3 is communicated with the interior of the barrel 11 , and the other end is communicated with the interior of the separation feed hole 111 .

[0036] The separation feed hole 111 and the dehumidification mechanism 2 are arranged toward the feed end of the screw discharge mechanism 1, and the directions in which the screw discharge mechanism 1 and the dehumidification mechanism 2 extrude and convey the raw materials form an acute angle.

[0037] When the device is used for injection molding, the water vapor and part of the raw materials discharged from the barrel 11 of the screw discharge mechanism 1 will enter the dehumidification barrel 21. Under the rotation of the separation screw 22, the raw materials and water vapor are separated, and the water vapor is discharged through the exhaust hole 211 at the top of the dehumidification barrel 21. The raw materials are squeezed and moved into the barrel 11 under the action of the separation screw 22 to be transported again and continue the injection molding. This structure can effectively separate and remove the water vapor in the raw materials, and at the same time reduce the loss of raw materials, so as to reduce the impact on the production cycle and production quality of the injection molded products.

[0038] By utilizing the structure in which the minor diameter of the feeding section 121 of the conveying screw is smaller than the minor diameter of the compression and homogenization section 122, when the raw materials are conveyed in the barrel 11, the pressure at the connection between the two sections of the conveying screw will be reduced, and the water vapor generated by the heating of the raw materials will be more easily discharged through the pressure relief hole 3 near this position, thereby improving the discharge effect of the water vapor.

[0039] In order to further improve the reliability of the device, a cooling member 24 is provided at the top of the dehumidification barrel 21, and a cooling hole 241 for circulating coolant is provided in the cooling member 24. When in use, the coolant is continuously circulated in the cooling hole 241 to cool the top of the dehumidification barrel 21, thereby preventing the raw materials entering the dehumidification barrel 21 from transferring heat to other components such as the drive unit 23 and causing damage thereto. At the same time, it ensures that the raw materials in the dehumidification barrel 21 still maintain a relatively high temperature and have a certain fluidity, which is convenient for being transferred to the barrel 11 again, thereby further improving the reliability and practicality of the device.

[0040] A stepped hole is also provided at the top of the dehumidification barrel 21, and a self-aligning bearing 25 for mounting the separation screw 22 is provided in the stepped hole. The self-aligning bearing 25 is a prior art, and an end face or axial self-aligning bearing with anti-top and limit function can be selected. The separation screw 22 mounted on the self-aligning bearing 25 has an automatic self-aligning function, thereby preventing the separation screw 22 from getting stuck during operation, thereby further improving the reliability and practicality of the device.

[0041] The implementation principle of the enhanced exhaust barrel for an injection molding machine in the present application is as follows:

[0042] During the injection molding process, the raw material in the molten state is pressurized and conveyed through the screw discharge mechanism 1. During the raw material conveying process, the water vapor generated enters the dehumidification barrel 21 through the pressure relief hole 3 on the barrel 11, and the driving unit 23 drives the separation screw 22 to rotate along its own axis. Under the action of the separation screw 22, the raw material and water vapor are separated, and the water vapor is discharged to the outside through the exhaust hole 211. Under the action of the separation screw, the separated raw material enters the barrel 11 again through the separation feed hole 111 for injection molding. The device can effectively separate and remove the water vapor generated by the injection molding raw material, improve the separation and removal effect of the water vapor, and at the same time reduce the loss of raw materials, reducing the impact on the production cycle and production quality of the injection molding products.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A reinforced exhaust barrel for an injection molding machine, characterized in that: The invention comprises a screw discharge mechanism (1) for extruding and conveying raw materials, wherein the screw discharge mechanism (1) comprises a barrel (11) and a discharge screw (12) coaxially and rotatably arranged inside the barrel (11), a dehumidification mechanism (2) is arranged in the middle of the barrel (11), and the dehumidification mechanism (2) comprises a dehumidification barrel (21), the dehumidification barrel (21) is a component having a cylindrical through hole arranged inside, one end of the dehumidification barrel (21) is connected to the middle of the barrel (11), and a dehumidification barrel (21) is arranged between the dehumidification barrel (21) and the barrel (11). At least one interconnected pressure relief hole (3) is provided, an exhaust hole (211) connected to the interior of the dehumidification barrel (21) is provided near the top thereof, a separation screw (22) rotates inside the dehumidification barrel (21) and is coaxially arranged therein, the separation screw (22) is used to separate raw materials and water vapor, and is also used to extrude and transport the raw materials back to the barrel (11), and a driving unit (23) is installed on the dehumidification barrel (21) for driving the separation screw (22) to rotate along its own axis.

2. The enhanced exhaust barrel for an injection molding machine according to claim 1, characterized in that: The dehumidification mechanism (2) is arranged toward the feeding end of the screw discharge mechanism (1), and the directions in which the screw discharge mechanism (1) and the dehumidification mechanism (2) extrude and convey the raw materials form an acute angle.

3. The enhanced exhaust barrel for an injection molding machine according to claim 1, characterized in that: The dehumidification mechanism (2) is arranged directly above the screw discharge mechanism (1).

4. The enhanced exhaust barrel for an injection molding machine according to claim 1, characterized in that: A cooling element (24) is provided on the top of the dehumidifying barrel (21), and a cooling hole (241) for circulating a cooling liquid is provided in the cooling element (24).

5. The enhanced exhaust barrel for an injection molding machine according to claim 1, characterized in that: The discharge screw (12) comprises two sections of coaxially arranged conveying screws, each section of the conveying screw comprises a feeding section (121) and a compression homogenization section (122). A separation feed hole (111) is provided on the barrel (11), and the separation feed hole (111) is provided at the connection between the two sections of the conveying screws. The dehumidification mechanism (2) is installed at the separation feed hole (111), and the separation feed hole (111) and the separation screw (22) are coaxially arranged.

6. The enhanced exhaust barrel for an injection molding machine according to claim 1, characterized in that: A stepped hole is provided at the top of the dehumidifying barrel (21), and a self-aligning bearing (25) for mounting the separation screw (22) is provided in the stepped hole.

7. A reinforced exhaust barrel for an injection molding machine according to claim 5, characterized in that: One end of the pressure relief hole (3) is in communication with the interior of the barrel (11), and the other end is in communication with the interior of the separation feed hole (111).

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