Screw rod for injection molding machine
The screw design with a conical head and buffer assembly stabilizes pressure and prevents backflow, addressing inefficiencies in existing screw designs for injection molding machines.
Patent Information
- Application Number
- CN202323523738.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-23
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-23
AI Technical Summary
Existing screw designs fail to efficiently control the pressure and flow of plastic inside the injection molding process, causing instability and inefficiency in the injection molding process.
A screw for an injection molding machine with a conical head, buffer assembly, and reinforcing blocks to stabilize pressure and prevent backflow of plastic liquid, featuring a buffer component and inwardly recessed grooves to manage pressure relief.
Stabilizes pressure and prevents backflow of plastic liquid, ensuring consistent injection molding performance by managing pressure fluctuations and flow stability.
Smart Images
Figure CN222178594U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of injection molding machines, and in particular relates to a screw rod used for an injection molding machine. Background Art
[0002] The screw head is a part on the injection head of the injection molding machine. Usually during injection molding, plastic particles are put in from the inlet, and the plastic particles are sent to one side of the screw head through the screw in the injection head. Then the heating device is started to melt the plastic particles, and then the screw is pushed by the hydraulic device to spray the molten plastic from the nozzle and press the plastic into the injection mold.
[0003] In the process of implementing this application, the inventors found that there are at least the following problems in this technology: the hot-melt solution inside the existing screw is pushed inside the screw. When the pressure is too high, the solution can easily flow out quickly through the flow holes, which is not suitable for the amount of solution required for injection molding; therefore, further improvements can be made. Utility Model Content
[0004] In view of the problem that the hot-melt solution inside the existing screw in the background technology is pushed inside the screw, and when the pressure is too high, the solution is very likely to flow out quickly through the flow hole, which is not suitable for the amount of solution required for injection molding, the present application provides a screw for an injection molding machine. The utility model arranges a buffer component to avoid the situation where the plastic liquid flows back from the flow hole at the head when the plastic liquid flows out through the hydraulic device, causing partial pressure relief, thereby ensuring the stability of the pressure.
[0005] The technical solution adopted by the utility model to solve its technical problems is as follows:
[0006] A screw for an injection molding machine comprises a screw and a conical head at the top of the screw, wherein a base is provided at the bottom of the screw, the bottom of the screw is connected to the base via a rotating assembly, a spiral ridge is provided around the circumference of the screw, a cavity is provided inside the screw which passes through the screw from top to bottom, a connecting cavity connected to the cavity is provided inside the head, a plurality of inwardly recessed arc-shaped grooves are distributed circumferentially on the outer wall of the head, a buffer assembly connecting the outside and the connecting cavity is provided inside the groove, and an injection port connected to the cavity is provided on the side wall of the screw.
[0007] Furthermore, the rotating assembly includes a plurality of through grooves arranged at the top of the base, the through grooves are circumferentially distributed at the top of the base, the top of the base is provided with an inwardly recessed placement groove, the inside of the base is provided with a circular ring channel connected to each through groove, the placement groove is connected to the through groove and the channel, a plurality of inverted "L"-shaped plug-in blocks protruding downward from the bottom of the screw rod, the plug-in blocks correspond to the through grooves, after the plug-in blocks are inserted into the through grooves, the plug-in blocks are turned into the channel by rotating the screw rod, and bolts are provided at the top of the base to connect the base and the plug-in blocks.
[0008] Furthermore, the buffer assembly includes a buffer box placed on the side wall of the head, a buffer cavity is provided inside the buffer box, an opening is provided on the side of the buffer box facing the connecting cavity, a limit plate with a diameter larger than the opening is provided on the side of the buffer box close to the opening, a spring is provided inside the buffer box and is pressed by the limit plate and the bottom end of the buffer box, a pressure rod moving in the opening is provided on the side of the limit plate facing the opening, and a plurality of flow holes are provided on the surrounding surfaces of one end of the buffer box placed on the outside of the head.
[0009] Furthermore, a plurality of reinforcement blocks protruding outward are provided on the outer peripheral surface of the screw ridge.
[0010] Furthermore, there are stoppers distributed at intervals on the left and right inner walls of the screw rod, and the stoppers on the left and right sides do not correspond one to one, but are distributed staggeredly up and down.
[0011] The beneficial effects of the utility model are:
[0012] 1. When the plastic liquid inside the communicating cavity reaches the opening, the pressure rod is compressed to squeeze the spring, so that the limit plate moves toward the side of the flow hole until the plastic liquid can flow out of the flow hole. On the contrary, when the plastic liquid outside the flow hole enters the flow hole, due to the obstruction of the limit plate, the plastic liquid entering the flow hole will be blocked by the limit plate, avoiding the situation where the plastic liquid flows back from the flow hole of the head when the plastic liquid flows out through the hydraulic device, causing partial pressure relief, thereby ensuring the stability of the pressure.
[0013] 2. There are blocks at intervals on the left and right inner walls of the screw, and the blocks on the left and right sides correspond to each other, which has a certain slowing effect on the plastic liquid inside the screw to prevent the liquid from flowing too fast and causing pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The foregoing and other objects, features and advantages of the present invention will become apparent from the following detailed description in conjunction with the accompanying drawings.
[0015] Figure 1 It is a schematic diagram of the structure of the utility model;
[0016] Figure 2 This is a schematic diagram of the internal structure of the utility model;
[0017] Figure 3 This is a partial enlarged view of point A of the utility model;
[0018] Figure 4 This is a schematic diagram of the bolt structure of the utility model;
[0019] Figure 5 This is a schematic diagram of the channel structure of the utility model;
[0020] Figure 6 It is a partial enlarged view of B of the utility model;
[0021] Figure 7 It is a partial enlarged view of point B of the utility model.
[0022] Among them: 1. screw; 2. head; 3. base; 4. rotating assembly; 401. through slot; 402. placement slot; 403. channel; 404. plug-in block; 405. bolt; 5. screw edge; 6. cavity; 7. connecting cavity; 8. groove; 9. buffer assembly; 901. buffer box; 902. buffer cavity; 903. opening; 904. limit plate; 905. spring; 906. pressure rod; 907. flow hole; 10. injection port; 11. reinforcement block; 12. stop block. DETAILED DESCRIPTION
[0023] The utility model is further described below in conjunction with the accompanying drawings.
[0024] Example 1, reference Figure 1-5 The utility model includes a screw 1 and a conical head 2 located at the top of the screw 1. A base 3 is provided at the bottom of the screw 1. The bottom of the screw 1 is connected to the base 3 through a rotating component 4. A spiral ridge 5 is circumferentially arranged around the screw 1. A cavity 6 penetrating from top to bottom is arranged inside the screw 1. A connecting cavity 7 communicating with the cavity 6 is arranged inside the head 2. A plurality of inwardly recessed arc grooves 8 are distributed circumferentially on the outer wall of the head 2. A buffer component 9 communicating with the outside and the connecting cavity 7 is arranged in the groove 8. An injection port 10 communicating with the cavity 6 is arranged on the side wall of the screw 1. The buffer component 9 is installed in the groove 8 to prevent the buffer component 9 from being exposed outside the plane of the head 2 and causing damage.
[0025] Reference Figure 2-5 The rotating assembly 4 includes a plurality of through grooves 401 arranged at the top of the base 3, and the through grooves 401 are distributed circumferentially at the top of the base 3. An inwardly recessed placement groove 402 is provided at the top of the base 3. A circular annular channel 403 connected to each through groove 401 is provided inside the base 3. The placement groove 402 is connected to the through groove 401 and the channel 403. A plurality of inverted "L"-shaped plug-in blocks 404 protrude downward from the bottom of the screw rod 1. The plug-in blocks 404 correspond to the through grooves 401. After the plug-in blocks 404 are inserted into the through grooves 401, the plug-in blocks 404 are transferred into the channel 403 by rotating the screw rod 1. A bolt 405 is provided at the top of the base 3 to connect the base 3 and the plug-in blocks 404, so that the installation is faster and more convenient.
[0026] Reference Figure 2 and Figure 6The buffer assembly 9 includes a buffer box 901 placed on the side wall of the head 2, a buffer cavity 902 is provided inside the buffer box 901, an opening 903 is provided on the side of the buffer box 901 facing the connecting cavity 7, a limiting plate 904 with a diameter larger than the opening 903 is provided on the side of the buffer box 901 close to the opening 903, a spring 905 is provided inside the buffer box 901 that is pressed by the limiting plate 904 and the bottom end of the buffer box 901, a pressure rod 906 that moves in the opening 903 is provided on the side of the limiting plate 904 facing the opening 903, and a plurality of flow holes 907 are provided on the surrounding surface of one end of the buffer box 901 placed on the outside of the head 2. When the plastic liquid inside the through cavity 7 reaches the opening 903, the pressure rod 906 is compressed to squeeze the spring 905, so that the limit plate 904 moves toward the side of the flow hole 907 until the plastic liquid can flow out of the flow hole 907. On the contrary, when the plastic liquid outside the flow hole 907 enters the flow hole 907, the plastic liquid entering the flow hole 907 will be blocked by the limit plate 904 due to the obstruction of the limit plate 904, thereby avoiding the situation where the plastic liquid flows out through the hydraulic device and the plastic liquid flows back from the flow hole 907 of the head 2, causing partial pressure relief, thereby ensuring the stability of the pressure.
[0027] Reference Figure 2 Blocks 12 are spaced apart on the left and right inner walls of the screw 1. The block blocks 12 on the left and right sides do not correspond to each other one by one, but are staggeredly distributed up and down, which has a certain slowing effect on the plastic liquid inside the screw 1 to prevent the liquid from flowing too fast and causing pressure relief.
[0028] Reference Figure 7 A plurality of outwardly protruding reinforcing blocks 11 are provided on the outer peripheral surface of the screw rib 5 to increase the strength of the screw rib 5 and reduce wear during use.
[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0030] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.
Claims
1. A screw for an injection molding machine, characterized in that: It includes a screw and a conical head at the top of the screw, a base is provided at the bottom of the screw, the bottom of the screw is connected to the base through a rotating component, a spiral spiral ridge is arranged around the circumference of the screw, a cavity is arranged inside the screw running through from top to bottom, a connecting cavity connected to the cavity is arranged inside the head, a plurality of inwardly recessed arc-shaped grooves are distributed circumferentially on the outer wall of the head, a buffer component connecting the outside and the connecting cavity is arranged inside the groove, and an injection port connected to the cavity is arranged on the side wall of the screw.
2. The screw for an injection molding machine according to claim 1, characterized in that: The rotating assembly includes a plurality of through grooves arranged at the top of the base, the through grooves are circumferentially distributed at the top of the base, the top of the base is provided with an inwardly recessed placement groove, the inside of the base is provided with a circular channel connected to each through groove, the placement groove is connected to the through groove and the channel, a plurality of inverted "L"-shaped plug-in blocks protruding downward from the bottom of the screw rod, the plug-in blocks correspond to the through grooves, after the plug-in blocks are inserted into the through grooves, the plug-in blocks are turned into the channel by rotating the screw rod, and a bolt is provided at the top of the base to connect the base and the plug-in blocks.
3. The screw for an injection molding machine according to claim 1, characterized in that: The buffer assembly includes a buffer box placed on the side wall of the head, a buffer cavity is provided inside the buffer box, an opening is provided on the side of the buffer box facing the connecting cavity, a limit plate with a diameter larger than the opening is provided on the side of the buffer box close to the opening, a spring is provided inside the buffer box and is pressed by the limit plate and the bottom end of the buffer box, a pressure rod moving in the opening is provided on the side of the limit plate facing the opening, and a plurality of flow holes are provided on the surrounding surfaces of one end of the buffer box placed on the outside of the head.
4. The screw for an injection molding machine according to claim 1, characterized in that: A plurality of reinforcement blocks protruding outwards are arranged on the outer peripheral surface of the screw rib.
5. The screw for an injection molding machine according to claim 1, characterized in that: Stoppers are arranged at intervals on the left and right inner side walls of the screw rod, and the stoppers on the left and right sides do not correspond to each other one by one, but are distributed staggeredly up and down.