Pet injection molding machine based on sectional type screw rod structure

Abstract

The utility model relates to the technical field of injection molding machines, in particular to a pet injection molding machine based on a sectional type screw structure, which comprises a charging barrel, a cooling mechanism is fixed on the charging barrel, the cooling mechanism comprises a sleeve and a water inlet pipe, the sleeve is fixed on the side wall of the charging barrel, and two ends of the sleeve are respectively communicated with the water inlet pipe and a water outlet pipe. A connecting seat is fixedly mounted on the sleeve, the connecting seat is communicated with the interior of the charging barrel, a filter screen is fixedly mounted at the part, close to the connecting seat, of the sleeve, a cold water tank is arranged in the connecting seat, the cold water tank is communicated with the interior of the sleeve through the filter screen, and the cold water tank is of an inclined surface structure; cooling water enters the sleeve through the water inlet pipe, the cooling water is filtered by the filter screen and then conveyed into the connecting seat, and the sleeve and the cold water tank are arranged, so that the temperature of plastic particles at the conveying section of the charging barrel and the bottom end of the connecting seat before entering the screw rod for plasticizing can be controlled, the plastic particles are prevented from being melted too early, and the plastic particles are ensured to smoothly enter the compression section of the screw rod in a solid state.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection molding machine technical field, specifically is pet injection molding machine based on sectional screw structure. BACKGROUND

[0002] Injection molding machine (also known as injection molding machine) is the key equipment in the field of plastic processing, which is used to make plastic products by injecting thermoplastic or thermosetting plastic into mold cavity after heating and melting, and then cooling and setting. Currently, injection molding machines have been widely used in many industrial fields such as household appliances, automobile parts, packaging containers, medical devices, etc., and have become the core equipment for mass production of modern plastic products. With the development of material science, the progress of injection molding machine technology directly affects the mechanical properties, dimensional accuracy and production efficiency of plastic products.

[0003] In the injection molding process of polyethylene terephthalate (PET) material, there are significant technical problems: PET material has strong hygroscopic properties. When moisture-containing PET particles enter the heating system of the injection molding machine, the following problems will occur:

[0004] (1) The presence of moisture will destroy the molecular chain structure of PET, resulting in a decrease in melting point;

[0005] (2) During the heating process, the vapor pressure generated by the vaporization of liquid water forms a microporous structure on the surface of the particles;

[0006] (3) The porous surface of the particles improves the thermal conductivity and accelerates the non-uniform absorption of heat;

[0007] (4) The above combined effects cause the PET material to partially melt prematurely in the normal processing temperature range.

[0008] This technical problem will cause defects such as silver streaks and bubbles in the injection molded product, reduce the tensile strength of the product, and require the injection molding machine to add an additional several hours of raw material pre-drying process, which seriously affects production efficiency and energy utilization.

[0009] Therefore, it is necessary to design an injection molding machine that can prevent PET particles from melting prematurely. Utility model content

[0010] Therefore, the present application provides a PET injection molding machine based on a sectional screw structure. The cooling water enters the sleeve interior through the water inlet pipe, is filtered by the filter screen and then delivered to the connecting seat. The sleeve and the cold water tank can control the temperature of the plastic particles at the bottom end of the connecting seat before entering the screw plasticizing section, avoid premature melting, and ensure that the plastic particles enter the screw compression section smoothly in solid state.

[0011] The technical solution of the utility model to solve the above technical problems is as follows:

[0012] The utility model provides a pet injection molding machine based on sectional screw structure, including cylinder, the cooling mechanism is fixed on the cylinder, the cooling mechanism includes sleeve and water inlet pipe, the sleeve is fixedly connected with the side wall of cylinder, the both ends of sleeve are linked with water inlet pipe and water outlet pipe respectively, the sleeve is fixedly installed with connecting seat, the inside of connecting seat is linked with cylinder, the part of sleeve close to connecting seat is fixedly installed with filter screen, be equipped with cold water tank in connecting seat, the inside of sleeve is linked with cold water tank through filter screen, and cold water tank is inclined plane structure arrangement.

[0013] Optionally, in an embodiment of the utility model, the filter screen is arranged in an annular structure, and the maximum width of the cold water tank is equal to the height of the filter screen.

[0014] Optionally, in an embodiment of the utility model, the water inlet pipe and the water outlet pipe are symmetrically fixed on the top of the sleeve, and the water inlet pipe and the water outlet pipe are both arranged in an L-shaped structure.

[0015] Optionally, in an embodiment of the utility model, the connecting seat is fixed with a storage mechanism, the storage mechanism includes a cover plate and a hopper, the hopper is clamped and installed on the connecting seat, the side wall of the hopper is fixedly connected with the cover plate, the cover plate is fixedly connected with a plug, the connecting seat is fixedly installed with a fixed ring, and the plug is clamped and connected with the fixed ring.

[0016] Optionally, in an embodiment of the utility model, the hopper is communicated with the inside of the cylinder through the connecting seat, and the bottom end of the hopper is arranged in an inclined plane structure.

[0017] Optionally, in an embodiment of the utility model, the plug is fixed in the inside of the fixed ring through a limiting bolt, and the top end of the cover plate abuts against the fixed ring.

[0018] Optionally, in an embodiment of the utility model, a stirring mechanism is rotatably installed in the hopper, the stirring mechanism includes a rotating shaft and a stirrer, the rotating shaft is rotatably installed in the hopper, the stirrer and a plurality of groups of long rods are fixedly installed on the rotating shaft.

[0019] Optionally, in an embodiment of the utility model, the plurality of long rods are arranged in a ring shape at equal distances, and the end portion of the long rod is arranged in a spherical structure.

[0020] Optionally, in an embodiment of the utility model, the bottom end of the rotating shaft is arranged in a conical structure, and the stirrer is located at the center of the bottom of the hopper.

[0021] Optionally, in an embodiment of the utility model, a feeding screw is rotatably installed in the inside of the cylinder, a discharge pipe is communicated with one end of the cylinder away from the sleeve, and two support seats are fixedly installed on the cylinder.

[0022] Compared with the prior art, the pet injection molding machine based on the segmented screw structure has the following characteristics:

[0023] When the pet particles are conveyed into the barrel, the cooling water can be conveyed into the sleeve fixed on the side wall of the barrel first, since the inner wall of the sleeve close to the connecting seat is fixedly installed with the filter screen, the cooling water can be discharged into the cold water tank part provided in the connecting seat after being filtered through the filter screen, and the cold water tank is provided in the inclined surface structure, so that the contact area of the cooling water and the inner wall of the connecting seat can be increased, and the pet particles can be cooled; the setting of the sleeve and the cold water tank can control the temperature of the plastic particles at the bottom end of the connecting seat before entering the screw plasticizing section, avoid premature melting, and ensure that the plastic particles enter the screw compression section in solid state; the cooling water can be discharged from the inside of the sleeve through the water outlet pipe installed on the circulating pump, so that the water circulates in the sleeve, and the cooling effect of the sleeve is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 It is a whole structure schematic view of the embodiment 1 of the present application;

[0026] Figure 2 It is a connecting structure schematic view of the support seat and the sleeve of the embodiment 1 of the present application;

[0027] Figure 3 It is a connecting structure schematic view of the sleeve and the connecting seat of the embodiment 1 of the present application;

[0028] Figure 4 It is Figure 3 It is an enlarged schematic view of the A part structure shown in the figure;

[0029] Figure 5 It is a connecting structure schematic view of the barrel and the conveying screw of the embodiment 1 of the present application;

[0030] Figure 6 It is Figure 5 It is an enlarged schematic view of the B part structure shown in the figure.

[0031] The reference signs are: support base 1, material cylinder 2, discharging pipe 3, cooling mechanism 4, sleeve 401, water inlet pipe 402, water outlet pipe 403, connecting base 404, cold water tank 405, filter screen 406, material storage mechanism 5, fixing ring 501, cover plate 502, hopper 503, plug 504, stirring mechanism 6, rotating shaft 601, long rod 602, stirrer 603, material conveying screw 7. DETAILED DESCRIPTION

[0032] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The technical solutions of the present application will be further described below with reference to the drawings of the embodiments of the present application. The present application is not limited to the following specific embodiments.

[0033] It should be understood that the same or similar reference signs in the drawings of the embodiments correspond to the same or similar components. In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top" and "bottom" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation of the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0034] Embodiment 1

[0035] Since pet is easily hygroscopic, moisture will reduce its melting point, when the pet particles that are not fully dried are heated, the moisture vaporization produces steam pressure, which promotes the softening of the particle surface, and after the particle structure is loose, it is easier to absorb heat, and then the pet particles will melt prematurely, therefore, a pet injection molding machine based on a segmented screw structure is designed, and the specific scheme is as follows:

[0036] As Figures 1-6As shown, the pet injection molding machine based on the segmented screw structure comprises a barrel 2, the barrel 2 is fixed with a cooling mechanism 4, the cooling mechanism 4 comprises a sleeve 401 and a water inlet pipe 402, the side wall of the barrel 2 is fixedly connected with the sleeve 401, the two ends of the sleeve 401 are communicated with the water inlet pipe 402 and the water outlet pipe 403 respectively, and the water inlet pipe 402 and the water outlet pipe 403 are both arranged in L-shaped structure, the sleeve 401 is fixedly installed with a connecting seat 404, the connecting seat 404 is communicated with the inside of the barrel 2, the part of the sleeve 401 close to the connecting seat 404 is fixedly installed with a filter screen 406, the filter screen 406 is arranged in annular structure, the cooling water is delivered into the sleeve 401 through the water inlet pipe 402, and the cooling water can be discharged into the cold water tank 405 part after being filtered by the filter screen 406; the connecting seat 404 is provided with a cold water tank 405, and the sleeve 401 and the cold water tank 405 can control the temperature of the plastic particles at the bottom end of the connecting seat 404 before entering the screw plasticizing section, avoid premature melting, and ensure that the plastic particles enter the screw compression section smoothly in solid state; the cold water tank 405 is communicated with the inside of the sleeve 401 through the filter screen 406, the cold water tank 405 is arranged in inclined plane structure, which can increase the contact area of the cooling water and the inner wall of the connecting seat 404, and then the pet particles can be cooled; the maximum width of the cold water tank 405 is equal to the height of the filter screen 406.

[0037] The connecting seat 404 is fixedly provided with a storage mechanism 5, the storage mechanism 5 comprises a cover plate 502 and a hopper 503, in the embodiment, the hopper 503 is clamped and installed on the connecting seat 404, the hopper 503 is communicated with the inside of the barrel 2 through the connecting seat 404, and the bottom end of the hopper 503 is arranged in inclined plane structure, the side wall of the hopper 503 is fixedly connected with the cover plate 502, the cover plate 502 is fixedly connected with an insertion block 504, the connecting seat 404 is fixedly installed with a fixed ring 501, the top end of the cover plate 502 abuts against the fixed ring 501, the insertion block 504 is clamped into the fixed ring 501 in clamping connection between the insertion block 504 and the fixed ring 501, the insertion block 504 can be installed on the fixed ring 501 through the limiting bolt, when the cover plate 502 abuts against the fixed ring 501, the hopper 503 can be communicated with the inside of the connecting seat 404, and then the pet particles can be delivered into the barrel 2 through the connecting seat 404.

[0038] The stirring mechanism 6 is rotatably installed in the hopper 503, and the stirring mechanism 6 comprises a rotating shaft 601 and a stirrer 603. The rotating shaft 601 is rotatably installed in the hopper 503. In this embodiment, the rotating shaft 601 is fixedly installed with the stirrer 603 and a plurality of groups of long rods 602. The rotating shaft 601 drives the long rods 602 and the stirrer 603 to rotate in the hopper 503. The stirrer 603 stirs the pet particles at the end of the hopper 503, so as to prevent the pet particles from caking in the hopper 503 or the feeding section, causing bridging and making the particles difficult to be discharged. The plurality of long rods 602 are arranged in a ring shape at equal intervals, and the end of the long rod 602 is provided in a spherical structure. The bottom end of the rotating shaft 601 is provided in a conical structure. The stirrer 603 is located at the center of the bottom of the hopper 503.

[0039] The inside of the barrel 2 is rotatably installed with a feeding screw 7. In this embodiment, the barrel 2 is communicated with a discharge pipe 3 at one end away from the sleeve 401. The feeding screw 7 in the barrel 2 is driven to rotate, so as to convey the pet particles to the position of the barrel 2 close to the discharge pipe 3, and then facilitate the conveying of the material into the injection mold. The barrel 2 is fixedly installed with two support seats 1.

[0040] Working principle:

[0041] First, the plug block 504 installed at the bottom end of the cover plate 502 is clamped and installed in the inside of the fixed ring 501. The plug block 504 can be installed in the fixed ring 501 through the limiting bolt. When the cover plate 502 contacts the fixed ring 501, the hopper 503 can be communicated with the inside of the connecting seat 404, and then the pet particles can be conveyed into the barrel 2 through the connecting seat 404. Then, the hopper 503 is opened, and the pet particles can be conveyed into the hopper 503 through the feeding assembly for storage. When feeding, the control switch of the rotating shaft 601 is opened, so as to drive the two groups of long rods 602 and the stirrer 603 to rotate in the hopper 503. The stirrer 603 stirs the pet particles at the end of the hopper 503, so as to prevent the pet particles from caking in the hopper 503 or the feeding section, causing bridging and making the particles difficult to be discharged.

[0042] When it is needed to convey the pet particles into the barrel 2, the cooling water can be first conveyed into the sleeve 401 fixed on the side wall of the barrel 2. Since the sleeve 401 is fixedly installed with the filter screen 406 close to the inner wall of the connecting seat 404, the cooling water can be filtered through the filter screen 406 and then discharged into the cold water tank 405 arranged in the connecting seat 404. The cold water tank 405 is provided in an inclined surface structure, so as to increase the contact area of the cooling water with the inner wall of the connecting seat 404, and then cool the pet particles.

[0043] The setting of the sleeve 401 and the cold water tank 405 can control the temperature of the plastic particles at the bottom end of the feeding section of the barrel 2 before entering the plasticizing screw, avoid premature melting, and ensure that the plastic particles enter the compression section of the screw smoothly in a solid state.

[0044] Driving the rotation of the feeding screw 7 in the barrel 2 can make the pet particles be transported to the position of the barrel 2 close to the discharge pipe 3, and then the material can be transported into the injection mold.

[0045] The pet injection molding machine has the advantages that the setting of the sleeve and the cold water tank can control the temperature of the plastic particles at the bottom end of the feeding section of the barrel before entering the plasticizing screw, avoid premature melting, and ensure that the plastic particles enter the compression section of the screw smoothly in a solid state; and the cooling water can be discharged from the inside of the sleeve through the water outlet pipe installed on the circulating pump, so that the water circulates in the sleeve, and the cooling effect of the sleeve is improved.

[0046] Since the feeding screw 7 is composed of a feeding section, a melting section and a metering section, when the feeding screw 7 is driven to rotate in the barrel 2, the pet particles in the barrel 2 can be transported through the feeding section of the feeding screw 7; then the pet particles are transported to the melting section of the feeding screw 7, and the temperature of the melting section is higher than that of the feeding section, so that the pet particles can be smoothly melted; finally, when the melt is transported to the position of the barrel 2 close to the discharge pipe 3, stable injection into the injection mold can be realized.

[0047] Embodiment 2

[0048] In this embodiment, the structure of the injection molding machine is basically the same as that of embodiment 1, and the difference lies in that on the basis of embodiment 1, a variable-diameter spiral stirrer matching the taper of the hopper 503 is used in the hopper 503 to improve the stability of the discharge and reduce the occurrence rate of bridging.

[0049] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not enumerated. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A pet injection molding machine based on segmented screw construction comprising a barrel characterized in that: The cooling mechanism is fixed on the barrel, and comprises a sleeve and water inlet pipes, the sleeve is fixedly connected to the side wall of the barrel, water inlet pipes and water outlet pipes are communicated with the two ends of the sleeve respectively, a connecting seat is fixedly installed on the sleeve, the connecting seat is communicated with the inside of the barrel, a filter screen is fixedly installed on the part of the sleeve close to the connecting seat, a cold water tank is arranged in the connecting seat, the cold water tank is communicated with the inside of the sleeve through the filter screen, and the cold water tank is arranged in an inclined surface structure.

2. The pet injection molding machine based on a segmented screw configuration according to claim 1, characterized in that: The filter screen is arranged in an annular structure, and the maximum width of the cold water tank is equal to the height of the filter screen.

3. The pet injection molding machine based on segmented screw configuration of claim 1, wherein: The water inlet pipes and the water outlet pipes are symmetrically fixed on the top of the sleeve, and the water inlet pipes and the water outlet pipes are arranged in L-shaped structures.

4. The pet injection molding machine based on segmented screw configuration of claim 1, wherein: A storage mechanism is fixed on the connecting seat, the storage mechanism comprises a cover plate and a hopper, the hopper is clamped and installed on the connecting seat, the side wall of the hopper is fixedly connected with the cover plate, the cover plate is fixedly connected with a plug, and a fixed ring is fixedly installed on the connecting seat.

5. The pet injection molding machine based on a segmented screw configuration according to claim 4, characterized in that: The hopper is communicated with the inside of the barrel through the connecting seat, and the bottom end of the hopper is arranged in an inclined surface structure.

6. The pet injection molding machine based on segmented screw configuration of claim 4, wherein: The plug is fixed in the inside of the fixed ring through a limiting bolt, and the top end of the cover plate abuts against the fixed ring.

7. The pet injection molding machine based on segmented screw configuration of claim 4, wherein: A stirring mechanism is rotatably installed in the hopper, the stirring mechanism comprises a rotating shaft and a stirrer, the rotating shaft is rotatably installed in the hopper, and the stirrer and a plurality of groups of long rods are fixedly installed on the rotating shaft.

8. The pet injection molding machine based on a segmented screw configuration according to claim 7, characterized in that: The long rods are arranged in an annular equidistant manner, and the end portions of the long rods are arranged in spherical structures.

9. The pet injection molding machine based on segmented screw configuration of claim 7, wherein: The bottom end of the rotating shaft is arranged in a conical structure, and the stirrer is located at the center of the bottom of the hopper.

10. The pet injection molding machine based on segmented screw configuration of claim 1, wherein: A feeding screw is rotatably installed in the inside of the barrel, a discharging pipe is communicated with the end of the barrel away from the sleeve, and two supporting seats are fixedly installed on the barrel.

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