A heating and melting device for a plastic injection molding machine

Abstract

The utility model relates to the field of plastic injection molding machine, concretely relates to a kind of heating melting device for plastic injection molding machine, including heating transmission barrel, heating transmission barrel is equipped with storage barrel, be equipped with crushing mechanism in the storage barrel, heating stirring mechanism is equipped under the crushing mechanism, quantitative material conveying structure is equipped on the storage barrel, after crushing mechanism crushes large particle plastics, secondary chopping is stirred by knife two, substantially increase raw material heating area, accelerate melting speed, reduce local unmelted or overheating decomposition phenomenon, stirring knife rotation chops, make raw material and the inner wall of heated pipeline fully contact, improve the uniformity of molten plastic;Hydraulic telescopic link drives sealing disc to open and close, controls the on-off of discharging channel, realizes raw material quantitative conveying, avoids the blockage of feeding pipeline to affect continuous production, improves production stability.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment, and particularly to a heating and melting device for a plastic injection molding machine. Background Technology

[0002] In plastic injection molding, the heating and melting unit is a key piece of equipment for converting solid plastic raw materials into a molten state. Its melting efficiency, the degree of raw material refinement, and the uniformity of heating directly affect the molding quality and production efficiency of the injection molded parts. With the increasing diversity of plastic raw materials and the increasing requirements for injection molding precision, the limitations of traditional heating and melting units are gradually becoming apparent.

[0003] Traditional plastic injection molding machines have several shortcomings in their heating and melting devices: solid plastic granules enter the heating mechanism directly, large granules melt slowly and are heated unevenly, easily resulting in unmelted areas or overheating and decomposition; they lack an effective raw material pretreatment mechanism, making it impossible to refine agglomerated or large granules, leading to prolonged heating time and reduced production efficiency; the raw material delivery rate is difficult to control precisely, and uneven heating can easily cause solid granules to clog the supply, resulting in pipe blockage or insufficient supply affecting continuous production, further exacerbating uneven heating and restricting the stability and product quality of injection molding. Utility Model Content

[0004] The purpose of this invention is to provide a heating and melting device for a plastic injection molding machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a heating and melting device for a plastic injection molding machine, comprising a heating and conveying cylinder, a storage cylinder on the heating and conveying cylinder, a crushing mechanism inside the storage cylinder, a heating and stirring mechanism below the crushing mechanism, and a quantitative conveying structure on the storage cylinder.

[0006] In a preferred embodiment of this utility model, the crushing mechanism includes a support plate disposed on a storage cylinder, a support frame disposed on the support plate, a motor disposed on the support frame, a rotating shaft connected to the output end of the motor, a bearing ring disposed on the support plate, the rotating shaft extending to the top of the storage cylinder through the bearing ring, a rotating rod movably disposed inside the storage cylinder, the rotating shaft being connected to the rotating rod, and several crushing rods disposed on the rotating rod.

[0007] In a preferred embodiment of this utility model, the heating and stirring mechanism includes a sealing disc, the top of which is connected to a rotating rod. A conveying pipe is connected below the storage cylinder, and a sealing bearing is provided between the conveying pipe and the storage cylinder. The outer diameter of the sealing disc matches the size of the sealing bearing. A stirring blade is provided below the sealing disc, and a heating ring is provided outside the conveying pipe.

[0008] As a preferred embodiment of this utility model, the quantitative feeding structure includes a support ring, with positioning plates on both sides of the support ring. A hydraulic telescopic rod is provided on the positioning plate, and the output end of the hydraulic telescopic rod is connected to the support plate. A positioning rod is provided inside the storage cylinder, with one end of the positioning rod connected to the inner wall of the storage cylinder. The other ends of several positioning rods are connected to positioning rings, and positioning bearings are provided inside the positioning rings. The rotating rod is movably disposed within the positioning bearings.

[0009] As a preferred embodiment of this invention, the bottom of the conveying pipe is provided with a screen, and the bottom of the conveying pipe is connected to the heating and conveying cylinder.

[0010] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects: The crushing mechanism crushes large plastic particles to below 5mm, and the stirring blade further crushes them to below 2mm, significantly increasing the heating area of ​​the raw material, accelerating the melting speed, and reducing local unmelted or overheated decomposition. The rotating stirring blade prevents the raw material from settling at the bottom of the pipe, ensuring that the raw material is in full contact with the heated inner wall of the pipe, thus improving the uniformity of the molten plastic.

[0011] The hydraulic telescopic rod drives the sealing disc to open and close, controlling the opening and closing of the material feeding channel, realizing quantitative material feeding, avoiding blockage of the material supply pipeline and affecting continuous production, and improving production stability.

[0012] The crushing, chopping and heating processes are linked, and the pre-treated small particles of raw material melt quickly, reducing the overall heating time and improving production efficiency. At the same time, the screen filters out impurities and ensures the quality of the molten plastic. Attached Figure Description

[0013] Figure 1 This is an overall drawing of the present utility model; Figure 2 This is a front view of the entire utility model; Figure 3 This is an internal view of the storage cylinder of this utility model; Figure 4 This is an enlarged view of the internal structure of the storage cylinder of this utility model; Figure 5 This is a front view of the internal structure of the storage cylinder of this utility model.

[0014] Reference numerals: 1. Heating and conveying cylinder; 2. Storage cylinder; 3. Crushing mechanism; 301. Support plate; 302. Support frame; 303. Motor; 304. Rotating shaft; 305. Bearing ring; 306. Rotating rod; 307. Crushing rod; 4. Heating and stirring mechanism; 401. Sealing disc; 402. Conveying pipe; 403. Sealed bearing; 404. Stirring blade; 405. Heating ring; 5. Quantitative conveying structure; 5. Support ring; 501. Positioning plate; 502. Hydraulic telescopic rod; 503. Positioning rod; 504. Positioning ring; 505. Positioning bearing; 506. Screen; 6. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0016] This utility model provides a technical solution: a heating and melting device for a plastic injection molding machine, including a heating and conveying cylinder 1, such as... Figures 1-3 As shown, a storage cylinder 2 is provided on the heating and conveying cylinder 1, a crushing mechanism 3 is provided inside the storage cylinder 2, a heating and stirring mechanism 4 is provided below the crushing mechanism 3, and a quantitative conveying structure 5 is provided on the storage cylinder 2.

[0017] like Figure 2 , Figure 5 As shown, the crushing mechanism 3 includes a support plate 301, which is mounted on the storage cylinder 2. A support frame 302 is mounted on the support plate 301, and a motor 303 is mounted on the support frame 302. The output end of the motor 303 is connected to a rotating shaft 304. A bearing ring 305 is mounted on the support plate 301, and the rotating shaft 304 extends to the top of the storage cylinder 2 through the bearing ring 305. A rotating rod 306 is movably mounted inside the storage cylinder 2, and the rotating shaft 304 is connected to the rotating rod 306. Several crushing rods 307 are mounted on the rotating rod 306.

[0018] like Figure 2 , Figure 5 As shown, the heating and stirring mechanism 4 includes a sealing disc 401, the top of which is connected to the rotating rod 306. A conveying pipe 402 is connected below the storage cylinder 2. A sealing bearing 403 is provided between the conveying pipe 402 and the storage cylinder 2. The outer diameter of the sealing disc 401 matches the size of the sealing bearing 403. A stirring blade 404 is provided below the sealing disc 401. A heating ring 405 is provided outside the conveying pipe 402.

[0019] like Figure 2 , Figure 4 , Figure 5 As shown, the quantitative feeding structure 5 includes a support ring 501, with positioning plates 502 on both sides of the support ring 501. A hydraulic telescopic rod 503 is provided on the positioning plate 502, and the output end of the hydraulic telescopic rod 503 is connected to the support plate 301. A positioning rod 504 is provided inside the storage cylinder 2. One end of the positioning rod 504 is connected to the inner wall of the storage cylinder 2, and the other end of several positioning rods 504 is connected to a positioning ring 505. A positioning bearing 506 is provided inside the positioning ring 505, and the rotating rod 306 is movably disposed inside the positioning bearing 506.

[0020] like Figure 2 , Figure 4 As shown, a screen 6 is provided at the bottom of the conveying pipe 402, and the bottom of the conveying pipe 402 is connected to the heating and conveying cylinder 1.

[0021] In practice, plastic granules with a diameter not exceeding 30mm are added to the storage cylinder 2. The motor 303 is started, and the rotating shaft 304 drives the rotating rod 306 and the crushing rod 307 to rotate at high speed. The crushing rod 307 impacts and shears the large plastic granules, crushing them into small particles with a diameter of less than 5mm. During the crushing process, the positioning bearing 506 restricts the shaking of the rotating rod 306 to ensure uniform crushing.

[0022] After crushing, the hydraulic telescopic rod 503 of the quantitative conveying structure 5 is activated. The hydraulic telescopic rod 503 extends and pushes the support plate 301 upward, causing the rotating rod 306 and the sealing disc 401 to move upward synchronously. The sealing disc 401 separates from the sealing bearing 403, forming a discharge channel. The crushed particles in the storage cylinder 2 enter the conveying pipe 402 under the action of gravity.

[0023] At this time, the rotating rod 306 continues to rotate, and the stirring blade 404 at the bottom of the sealing disc 401 performs secondary crushing on the falling particles, further refining the particles to a diameter of less than 2mm, while simultaneously pushing the particles to move towards the lower part of the conveying pipe 402.

[0024] The heating ring 405 is activated to heat the temperature inside the conveying pipe 402 to the plastic melting temperature, which is adjusted according to the type of plastic, usually 150-250℃. The refined particles are pushed by the stirring blade 404 and come into contact with the inner wall of the conveying pipe 402, where they are heated and melted into molten plastic.

[0025] After impurities are filtered through screen 6, the molten plastic flows into the heated transfer cylinder 1, where the temperature is maintained and the plastic is transported to the injection molding machine to complete the heating and melting process.

[0026] After the granules in storage cylinder 2 have been conveyed, the hydraulic telescopic rod 503 retracts, causing the support plate 301 and rotating rod 306 to move downwards, and the sealing disc 401 re-fits and seals with the sealing bearing 403. After adding new plastic granules, preparations are made for the next operation.

[0027] It should be understood that the above-described specific embodiments of this utility model are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within the protection scope of this utility model. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A heating and melting device for a plastic injection molding machine, comprising a heating and conveying cylinder (1), characterized in that: The heating and conveying cylinder (1) is provided with a storage cylinder (2), the storage cylinder (2) is provided with a crushing mechanism (3), the crushing mechanism (3) is provided with a heating and stirring mechanism (4) below it, and the storage cylinder (2) is provided with a quantitative conveying structure (5).

2. The heating and melting device for a plastic injection molding machine according to claim 1, characterized in that: The crushing mechanism (3) includes a support plate (301), which is mounted on the storage cylinder (2). A support frame (302) is mounted on the support plate (301), and a motor (303) is mounted on the support frame (302). The output end of the motor (303) is connected to a rotating shaft (304). A bearing ring (305) is mounted on the support plate (301). The rotating shaft (304) extends to the top of the storage cylinder (2) through the bearing ring (305). A rotating rod (306) is movably mounted inside the storage cylinder (2). The rotating shaft (304) is connected to the rotating rod (306), and several crushing rods (307) are mounted on the rotating rod (306).

3. The heating and melting device for a plastic injection molding machine according to claim 2, characterized in that: The heating and stirring mechanism (4) includes a sealing disc (401), the top of which is connected to a rotating rod (306). A conveying pipe (402) is connected below the storage cylinder (2). A sealing bearing (403) is provided between the conveying pipe (402) and the storage cylinder (2). The outer diameter of the sealing disc (401) matches the size of the sealing bearing (403). A stirring blade (404) is provided below the sealing disc (401). A heating ring (405) is provided outside the conveying pipe (402).

4. The heating and melting device for a plastic injection molding machine according to claim 3, characterized in that: The quantitative feeding structure (5) includes a support ring (501), and positioning plates (502) are provided on both sides of the support ring (501). A hydraulic telescopic rod (503) is provided on the positioning plate (502). The output end of the hydraulic telescopic rod (503) is connected to the support plate (301). A positioning rod (504) is provided inside the storage cylinder (2). One end of the positioning rod (504) is connected to the inner wall of the storage cylinder (2). The other end of several positioning rods (504) is connected to a positioning ring (505). A positioning bearing (506) is provided inside the positioning ring (505). The rotating rod (306) is movably arranged inside the positioning bearing (506).

5. The heating and melting device for a plastic injection molding machine according to claim 4, characterized in that: The bottom of the conveying pipe (402) is provided with a screen (6), and the bottom of the conveying pipe (402) is connected to the heating and conveying cylinder (1).

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