An injection molding machine

Abstract

The utility model relates to a kind of injection molding machines, including rack, forming mechanism and injection mechanism, the injection mechanism is used to inject hot melt adhesive into the forming mechanism;The injection mechanism includes barrel mounted on the rack, hopper arranged on the barrel, screw arranged in the barrel and power component for driving the screw movement;The screw includes by right to left sequentially including connecting section, feeding section, compression section, homogenization section and mixing section;The mixing section includes the first runner and the second runner of several first runner and several second runner arranged in circumferential array, the first runner penetrates the mixing section, the outside of the first runner is correspondingly provided with at least one second runner, at least a part of the second runner is arc-shaped, and the left and right ends are both communicated with the corresponding first runner, and the width of the second runner gradually decreases from left to right.The utility model solves the problem that the existing screw structure is complex, and the assembly precision is difficult to guarantee.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to an injection molding machine. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection molding machines, are the main molding equipment used to produce various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. The working principle of an injection molding machine is similar to that of a syringe; it uses the thrust of a screw (or plunger) to inject pre-plasticized molten plastic (i.e., a viscous flow state) into a closed mold cavity, where it solidifies and sets to obtain the finished product. Injection molding is a cyclical process, with each cycle mainly including: metered feeding, melting and plasticizing, pressure injection, mold filling and cooling, and mold opening and part removal. After the plastic part is removed, the mold is closed again, and the next cycle begins.

[0003] Existing screws typically achieve mixing and anti-reverse flow of hot melt adhesive through a mixing section and a check ring, as detailed in the Chinese patent document with application number "201911358902.1". However, this results in complex product structures and difficulty in ensuring assembly precision.

[0004] Therefore, it is necessary to provide a technical solution to address the above problems. Utility Model Content

[0005] This invention provides an injection molding machine that aims to solve the problems of complex screw structure and difficulty in ensuring assembly accuracy in existing screw systems.

[0006] To achieve the above objectives, this utility model provides an injection molding machine, including a frame, a molding mechanism and an injection mechanism, wherein the injection mechanism is used to inject hot melt adhesive into the molding mechanism;

[0007] The injection mechanism includes a cylinder mounted on the frame, a hopper disposed on the cylinder, a screw disposed inside the cylinder, and a power component for driving the screw to move; wherein:

[0008] The screw includes, from right to left, a connecting section, a feeding section, a compression section, a homogenization section, and a mixing section; the mixing section includes a plurality of first flow channels and a plurality of second flow channels arranged in a circumferential array, the first flow channels penetrating the mixing section, and at least one second flow channel corresponding to the outer side of the first flow channel, at least a portion of the second flow channel being arc-shaped, with both its left and right ends connected to the corresponding first flow channels, and the width of the second flow channel gradually decreasing from left to right.

[0009] More specifically, the tangent direction at the connection point between the right side of the second flow channel and the first flow channel points away from the homogenization section.

[0010] More specifically, at least two second channels are provided on the outer side of the first channel, and the at least two second channels are distributed on both sides of the first channel.

[0011] More specifically, two adjacent first channels are connected by a third channel, and at least one second channel is provided on the right side of the third channel.

[0012] More specifically, the cross-section of the first flow channel and / or the second flow channel is arc-shaped.

[0013] More specifically, the thickness of the spiral blades in the feeding section is greater than the thickness of the spiral blades in the compression section, and the thickness of the spiral blades in the compression section is greater than the thickness of the spiral blades in the homogenization section.

[0014] More specifically, the ratio of the spiral blade thickness of the feeding section, the spiral blade thickness of the compression section, and the spiral blade thickness of the homogenization section is 2:3:4.

[0015] More specifically, the feeding section is detachably connected to the compression section, and the homogenization section is detachably connected to the compression section.

[0016] The technical advantages of the injection molding machine involved in this utility model are as follows:

[0017] This application incorporates a second flow channel branching off from the first flow channel in the mixing section. This allows a portion of the hot melt adhesive material flowing into the first channel to be diverted into the second channel before flowing back into the first channel, thus achieving mixing. Furthermore, when the hot melt adhesive material is injected into the molding mechanism, if a backflow tendency occurs within the cylinder, a portion of the hot melt adhesive material in the first channel will also flow back into the second channel. When the hot melt adhesive material in the second channel flows out of the first channel, it generates an impact force that prevents the backflow of hot melt adhesive material in the first channel, thereby achieving a backflow prevention effect. This mixing section achieves both mixing and backflow prevention, realizing multiple uses and saving production costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an injection molding machine involved in this utility model;

[0019] Figure 2 This is a schematic diagram of the screw structure in an injection molding machine according to this utility model;

[0020] Figure 3 This is a front view of a screw in an injection molding machine according to this utility model;

[0021] Figure 4 This is a schematic diagram of the mixing section in an injection molding machine that relates to this utility model.

[0022] Marked in the image:

[0023] 1. Frame; 2. Molding mechanism; 3. Injection mechanism;

[0024] 31. Cylinder; 32. Hopper; 33. Screw; 331. Connecting section; 332. Feeding section; 333. Compression section; 334. Homogenization section; 335. Mixing section; 3351. First flow channel; 3352. Second flow channel; 3353. Third flow channel. Detailed Implementation

[0025] 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 the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component at the same time; when a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intervening component at the same time.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In the description of the embodiments of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of this utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0029] To more clearly illustrate the technical solution of this utility model, a preferred embodiment is provided below for reference. Figures 1-4 An injection molding machine includes a frame 1, a molding mechanism 2 and an injection mechanism 3, wherein the injection mechanism 3 is used to inject hot melt adhesive into the molding mechanism 2;

[0030] The injection mechanism 3 includes a cylinder 31 mounted on the frame 1, a hopper 32 disposed on the cylinder 31, a screw 33 disposed inside the cylinder 31, and a power component for driving the screw 33 to move; this structural design is all prior art and will not be described in detail here, but it differs from the prior art in that:

[0031] The screw 33 includes, from right to left, a connecting section 331, a feeding section 332, a compression section 333, a homogenization section 334, and a mixing section 335. The mixing section 335 includes a plurality of first flow channels 3351 and a plurality of second flow channels 3352 arranged in a circumferential array. The first flow channels 3351 penetrate the mixing section 335. At least one second flow channel 3352 is provided on the outer side of the first flow channel 3351. At least a portion of the second flow channel 3352 is arc-shaped, and both its left and right ends are connected to the corresponding first flow channel 3351. The width of the second flow channel 3352 gradually decreases from left to right.

[0032] The working process of the injection molding machine involved in this utility model is as follows: plastic granules are conveyed into the cylinder 31 through the hopper 32. The power component drives the connecting section 331 to rotate the screw 33. When the screw 33 rotates, the feeding section 332 pushes the plastic granules to move towards the compression section 333. The compression section 333 then pushes the plastic granules to move towards the homogenization section 334. The cylinder 31 is equipped with a heating mechanism on the outside. During the movement, the plastic granules gradually melt into hot melt adhesive. When the hot melt adhesive moves to the mixing section 335, it flows in from the first flow channel 3351 (from right to left). Subsequently, a portion of the hot melt adhesive is diverted to the second flow channel 3352. The hot melt adhesive material in the second channel 3352 flows back into the first channel 3351. When the hot melt adhesive material in the second channel 3352 flows back into the first channel 3351, the two streams of hot melt adhesive material mix together, thus achieving the mixing of the hot melt adhesive material. When the hot melt adhesive material is injected into the molding mechanism 2, if the hot melt adhesive material in the cylinder 31 has a reverse flow tendency (from left to right), at this time, a portion of the hot melt adhesive material in the first channel 3351 will also flow back into the second channel 3352. When the hot melt adhesive material in the second channel 3352 flows out of the first channel 3351, it can generate an impact force that prevents the hot melt adhesive material in the first channel 3351 from flowing back, thus achieving the anti-reverse effect. The mixing section 335 of this application can achieve mixing and anti-reverse, realizing multiple uses and saving production costs.

[0033] The direction in which the hot melt adhesive flows out of the second channel 3352 is the tangential direction at the junction of the right side of the second channel 3352 and the first channel 3351. In this embodiment, the tangential direction at the junction of the right side of the second channel 3352 and the first channel 3351 points away from the homogenization section 334. Thus, the flow direction of the hot melt adhesive flowing out of the second channel 3352 is opposite to the flow direction of the hot melt adhesive flowing in the first channel 3351, which can better prevent the backflow of the hot melt adhesive in the first channel 3351.

[0034] In this embodiment, at least two second channels 3352 are provided on the outer side of the first channel 3351. The at least two second channels 3352 are distributed on both sides of the first channel 3351, so that the mixing effect and the anti-reverse effect of the mixing section 335 can be better.

[0035] In this embodiment, two adjacent first channels 3351 are connected by a third channel 3353, and at least one second channel 3352 is provided on the right side of the third channel 3353. The third channel 3353 enables the hot melt adhesive material between the two adjacent first channels 3351 to be blended, thereby improving the mixing effect. The position limitation of the second channel 3352 and the third channel 3353 can prevent the hot melt adhesive material in the first channel 3351 from flowing back along the third channel 3353.

[0036] In this embodiment, the cross-section of the first flow channel 3351 and / or the second flow channel 3352 is arc-shaped, which allows the adhesive to flow more smoothly.

[0037] In this embodiment, the thickness of the spiral blades in the feeding section 332 is greater than the thickness of the spiral blades in the compression section 333, and the thickness of the spiral blades in the compression section 333 is greater than the thickness of the spiral blades in the homogenization section 334. Due to friction between the plastic granules, the resistance between the granules initially entering the barrel is relatively high, requiring thicker spiral blades to transport them. However, as the plastic granules melt, the resistance decreases, thus the thickness of the spiral blades in the compression section 333 and the homogenization section 334 can gradually decrease.

[0038] Preferably, the ratio of the spiral blade thickness of the feeding section 332, the spiral blade thickness of the compression section 333, and the spiral blade thickness of the homogenization section 334 is 2:3:4.

[0039] In this embodiment, the feeding section 332 and the compression section 333 are detachably connected, and the homogenization section 334 and the compression section 333 are detachably connected. In this way, if any section of the spiral blade in the feeding section 332, the compression section 333 and the homogenization section 334 is damaged, only the corresponding part can be replaced, without replacing the entire screw 33, thus saving maintenance costs.

[0040] The above are merely preferred embodiments of the present utility model, and its structure is not limited to the shapes listed above. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An injection molding machine, comprising a frame, a molding mechanism, and an injection mechanism, wherein the injection mechanism is used to inject hot melt adhesive into the molding mechanism, characterized in that: The injection mechanism includes a cylinder mounted on the frame, a hopper disposed on the cylinder, a screw disposed inside the cylinder, and a power component for driving the screw to move; wherein: The screw includes, from right to left, a connecting section, a feeding section, a compression section, a homogenization section, and a mixing section; the mixing section includes a plurality of first flow channels and a plurality of second flow channels arranged in a circumferential array, the first flow channels penetrating the mixing section, and at least one second flow channel corresponding to the outer side of the first flow channel, at least a portion of the second flow channel being arc-shaped, with both its left and right ends connected to the corresponding first flow channels, and the width of the second flow channel gradually decreasing from left to right.

2. The injection molding machine according to claim 1, characterized in that: The tangent at the junction of the right side of the second flow channel and the first flow channel points away from the homogenization section.

3. The injection molding machine according to claim 1, characterized in that: At least two second channels are provided on the outer side of the first channel, and the at least two second channels are distributed on both sides of the first channel.

4. The injection molding machine according to claim 1, characterized in that: The two adjacent first flow channels are connected by a third flow channel, and at least one second flow channel is provided on the right side of the third flow channel.

5. The injection molding machine according to claim 1, characterized in that: The cross-section of the first flow channel and / or the second flow channel is arc-shaped.

6. The injection molding machine according to claim 1, characterized in that: The thickness of the spiral blades in the feeding section is greater than the thickness of the spiral blades in the compression section, and the thickness of the spiral blades in the compression section is greater than the thickness of the spiral blades in the homogenization section.

7. The injection molding machine according to claim 6, characterized in that: The ratio of the spiral blade thickness in the feeding section, the spiral blade thickness in the compression section, and the spiral blade thickness in the homogenization section is 2:3:

4.

8. The injection molding machine according to claim 6, characterized in that: The feeding section is detachably connected to the compression section, and the homogenization section is detachably connected to the compression section.

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