Plastic injection molding machine

Abstract

The invention is applicable to the technical field of plastic injection molding machines, and provides a plastic injection molding machine which comprises an injection molding machine body, the injection molding machine body further comprises a feeding pipe, and a charging barrel is arranged on the feeding pipe; the screen drum is arranged in the charging barrel and is used for screening materials; the connecting frame is arranged below the screen drum; the first rotating rod is rotationally mounted on one side of the charging barrel, connecting rods are arranged on the first rotating rod and the connecting frame, and a group of connecting rods are hinged; the first motor is fixedly mounted on one side of the charging barrel and is used for driving the connecting rod to drive the connecting frame to slide up and down; and an output shaft of the first motor is fixedly connected with the first rotating rod. According to the plastic injection molding machine provided by the scheme, the screening structure and the scraping mechanism in the charging barrel are optimized, so that the production efficiency, the product quality and the cleanliness are improved, and the plastic injection molding machine meets the high requirements of the medical field on plastic products.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic injection molding machines, and in particular relates to a plastic injection molding machine. Background Art

[0002] Plastic injection molding machines for medical plastic tubes process plastic raw materials into tubular products that meet medical standards by precisely controlling the melting, injection, cooling and solidification of plastic materials. These machines usually have the characteristics of high precision, high cleanliness and high stability to meet the strict requirements of plastic products in the medical field.

[0003] At present, when using traditional plastic injection molding machines, plastic raw materials are often directly poured into the barrel through the raw material feeding system. However, the existing barrel does not have a raw material sorting structure, and when larger particles of raw materials are mixed in and poured into the barrel, it is easy to cause clogging of the barrel. Summary of the invention

[0004] The present invention provides a plastic injection molding machine, aiming to solve the problem that the currently used plastic injection molding machine has no raw material sorting structure and thus is prone to discharge larger particles of raw materials into the barrel, causing blockage.

[0005] To solve the above problems, the present invention is implemented as follows: a plastic injection molding machine, comprising: an injection molding machine body, the injection molding machine body also comprising a feed pipe, a barrel is arranged on the feed pipe; a screen cylinder arranged in the barrel for screening materials; a connecting frame arranged below the screen cylinder; a first rotating rod rotatably installed on one side of the barrel, the first rotating rod and the connecting frame are both provided with connecting rods, a group of the connecting rods are hinged; a first motor fixedly installed on one side of the barrel for driving the connecting rod to drive the connecting frame to slide up and down, the output shaft of the first motor is fixedly connected to the first rotating rod; a scraping mechanism arranged in the barrel for scraping off raw materials adhering to the inner wall of the barrel.

[0006] Preferably, an annular seat is fixedly installed in the barrel, the annular seat is located above the screen barrel, a buffer spring is fixedly installed at the bottom of the annular seat, a bottom plate is installed at the bottom end of the buffer spring, and the bottom plate is fixedly connected to the connecting frame.

[0007] Preferably, a guide rod is fixedly mounted on the bottom of the annular seat, a guide cylinder is fixedly mounted on the top of the bottom plate, the guide cylinder is slidably connected to the guide rod, and one side of the guide cylinder is in contact with the screen cylinder.

[0008] Preferably, an installation box is fixedly installed in the screen cylinder, and a bidirectional screw is rotatably installed in the installation box. Both ends of the bidirectional screw are threaded with a holder, and a group of the holders are slidingly connected to the two sides of the screen cylinder respectively. A slot is provided on one side of the guide cylinder, and the slot is in sliding contact with the holder. A handle and a connecting frame are rotatably installed on the top of the installation box, and a first bevel gear is fixedly installed on the handle, the output rod of the connecting frame and the bidirectional screw, and a plurality of the first bevel gears are meshed with each other.

[0009] Preferably, an annular plate is fixedly mounted on the top of the installation box, a screw rod is threadedly mounted on the connection frame, and anti-skid pads are mounted on both the screw rod and the annular plate, and the two anti-skid pads are in contact with each other.

[0010] Preferably, the scraper mechanism includes: a connecting box fixedly mounted on the inner wall of the barrel; a scraper rotatably mounted on the bottom of the connecting box, the scraper being in rotational contact with the inner wall of the barrel; a second rotating rod rotatably mounted on one side of the inner wall of the barrel, the second rotating rod being located in the connecting box, a second bevel gear being fixedly mounted on the second rotating rod and the output rod of the scraper, the two second bevel gears being meshed with each other; sprockets fixedly mounted on the first rotating rod and the second rotating rod, respectively; a chain mounted on a group of the sprockets, the chain being meshed with a group of the sprockets.

[0011] Preferably, a placement groove is provided on the top of the annular seat, a guide bucket is placed on the placement groove, a discharge port of the guide bucket is located in the screen cylinder, a fixing bolt is threadedly installed on the guide bucket, and the fixing bolt is threadedly connected to the guide bucket.

[0012] Preferably, a limiting member is installed on the feed tube and the barrel, and the limiting member is composed of two arc plates and a plurality of arc clamping plates. The feed tube and the barrel are both provided with arc clamping grooves, and the plurality of arc clamping grooves are adapted to the plurality of arc clamping plates.

[0013] Preferably, a fixing block is fixedly installed on one side of the arc-shaped plate, and connecting bolts are threadedly installed on two of the fixing blocks.

[0014] Preferably, handles are fixedly mounted on the guide bucket and the mounting box, and the top of the annular seat is arranged in an inclined shape.

[0015] Preferably, a discharge box is fixedly installed on one side of the barrel, and a feed port is provided on the discharge box and one side of the barrel, the two feed ports are communicated, a push plate is slidably provided in the discharge box, a threaded barrel is rotatably installed on one side of the discharge box, a threaded rod is threadedly installed on the threaded barrel, and the threaded rod is fixedly connected to one side of the push plate, a second motor is fixedly installed on one side of the discharge box, and a third bevel gear is fixedly sleeved on the output shaft of the second motor and the threaded barrel, and the two third bevel gears are meshed with each other.

[0016] Preferably, a discharge hopper is installed on the top of the discharge box, a cover is threadedly installed on the discharge hopper, a limiting cylinder is installed on the bottom of the discharge box, a limiting rod is installed on the top of the injection molding machine body, and the limiting rod is slidably connected to the limiting cylinder.

[0017] Compared with the related art, the plastic injection molding machine provided by the present invention has the following beneficial effects:

[0018] Compared with the prior art, the plastic injection molding machine provided by the present invention can effectively screen plastic raw materials through the setting of the screen drum, prevent larger particles of raw materials from entering the barrel, thereby preventing the barrel from being blocked, and improving production efficiency and product quality. The screen drum is driven up and down by the first motor to realize automated screening operation, reduce manual labor intensity, and improve production efficiency. The setting of the scraper mechanism can ensure the cleanliness of the inner wall of the barrel, prevent the raw materials from adhering to the inner wall of the barrel, and further improve the cleanliness and quality of the product.

[0019] In summary, the plastic injection molding machine of the present invention improves production efficiency, product quality and cleanliness by optimizing the screening structure and scraping mechanism in the barrel, and is suitable for the high requirements for plastic products in the medical field. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of a plastic injection molding machine provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the main cross-sectional structure of the middle barrel and the discharge box provided by the present invention;

[0022] Figure 3 It is a schematic diagram of the side cross-sectional structure of the middle barrel provided by the present invention;

[0023] Figure 4 It is a schematic diagram of the main cross-sectional structure of the middle installation box, the bidirectional screw and the holder provided by the present invention;

[0024] Figure 5 It is an assembly diagram of the middle threaded rod, the threaded barrel, the third bevel gear and the second motor provided by the present invention;

[0025] Figure 6 It is an assembly diagram of the threaded rod and the push plate provided by the present invention;

[0026] Figure 7 It is an assembly diagram of the bidirectional screw and the holder provided by the present invention;

[0027] Figure 8 for Figure 2 An enlarged structural diagram of part A shown in FIG.

[0028] Fig. 9 for Figure 2 An enlarged schematic diagram of the structure of part B shown in FIG.

[0029] Fig.10 for Figure 2 An enlarged schematic diagram of the structure of part C shown in FIG.

[0030] Fig.11 for Figure 2 An enlarged structural diagram of part D shown in FIG.

[0031] Fig.12 for Figure 1 The enlarged structural diagram of part E is shown in

[0032] 1. Injection molding machine body; 2. Feed pipe; 3. Cylinder; 4. Screen cylinder; 5. Connecting frame; 6. First rotating rod; 7. Connecting rod; 8. First motor; 9. Annular seat; 10. Buffer spring; 11. Bottom plate; 12. Guide rod; 13. Guide cylinder; 14. Mounting box; 15. Bidirectional screw; 16. Clamping seat; 17. Handle; 18. Connecting frame; 19. First bevel gear; 20. Annular plate; 21. Twist rod; 22. Connecting box; 23. Scraper; 24. Second rotating rod; 25. Second bevel gear; 26. Sprocket; 27. Chain; 28. Guide bucket; 29. ​​Fixing bolt; 30. Limiting member; 31. Fixing block; 32. Connecting bolt; 33. Discharge box; 34. Push plate; 35. Threaded cylinder; 36. Threaded rod; 37. Second motor; 38. Third bevel gear; 39. Guide telescopic rod. DETAILED DESCRIPTION

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" in the specification and claims of the present application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order; the terms "inside", "outside", "left", and "right" indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] The embodiment of the present invention provides a plastic injection molding machine, such as Figure 1-12 As shown, the plastic injection molding machine includes: an injection molding machine body 1, the injection molding machine body 1 also includes a feed pipe 2, and a barrel 3 is arranged on the feed pipe 2; a screen cylinder 4 is arranged in the barrel 3 for screening materials; a connecting frame 5 is arranged below the screen cylinder 4; a first rotating rod 6 rotatably installed on one side of the barrel 3, and the first rotating rod 6 and the connecting frame 5 are both provided with a connecting rod 7, and a group of the connecting rods 7 are hinged; a first motor 8 is fixedly installed on one side of the barrel 3 for driving the connecting rod 7 to drive the connecting frame 5 to slide up and down, and the output shaft of the first motor 8 is fixedly connected to the first rotating rod 6; a scraping mechanism is arranged in the barrel 3 for scraping off the raw material adhering to the inner wall of the barrel 3.

[0036] In this embodiment, when the plastic raw material is discharged into the barrel 3 through the automatic feeding system, the screen drum 4 will screen the raw material to ensure that only fine particles that meet the requirements pass through, while larger particles of raw materials are blocked above the screen drum 4. When screening the material, the first motor 8 is first started to drive the first rotating rod 6 to rotate, and then the connecting frame 5 is driven to slide up and down through the connecting rod 7, so that the screen drum 4 moves up and down in the barrel 3 to perform screening work. A scraping mechanism is also provided in the barrel 3 to scrape off the raw material adhering to the inner wall of the barrel 3, ensuring the cleanliness of the barrel 3 and the smooth flow of the raw material, and also avoiding blockage of the barrel 3 and the feed pipe 2;

[0037] Then, the injection molding machine body 1 is used to melt the raw materials. Then, the molten plastic is injected into the mold cavity through the nozzle at a high flow rate under the high pressure of the plunger or screw of the injection molding machine body 1. Then, after a certain period of pressure holding and cooling, the molten plastic solidifies in the mold cavity into the desired shape of the plastic part. After cooling, the mold is opened and the plastic part is pushed out of the mold to complete the entire injection molding process. Through the setting of the screen drum 4, the plastic raw materials can be effectively screened to prevent larger particles of raw materials from entering the barrel 3, thereby preventing the barrel from being blocked, thereby improving production efficiency and product quality. The screen drum 4 is driven up and down by the first motor 8 to realize automatic screening operation, reduce manual labor intensity, and improve production efficiency. The setting of the scraper mechanism can ensure the cleanliness of the inner wall of the barrel 3 and prevent the raw materials from adhering to the inner wall of the barrel 3, thereby further improving the cleanliness and quality of the product.

[0038] In a further preferred embodiment of the present invention, an annular seat 9 is fixedly installed in the barrel 3, and the annular seat 9 is located above the screen cylinder 4. A buffer spring 10 is fixedly installed at the bottom of the annular seat 9, and a bottom plate 11 is installed at the bottom end of the buffer spring 10, and the bottom plate 11 is fixedly connected to the connecting frame 5.

[0039] In this embodiment, when the screen drum 4 moves up and down in the barrel 3 for screening, vibrations or impact forces may be generated during the screening process, and these forces will be transmitted to the bottom plate 11 through the connecting frame 5. The buffer spring 10 under the bottom plate 11 can absorb these vibrations or impact forces and play a buffering role, thereby protecting the screen drum 4 and the entire screening mechanism. Through the buffering effect of the buffer spring 10, the screen drum 4 can perform screening work more stably, and the screening efficiency and accuracy are improved. The setting of the buffer spring 10 can reduce the vibration and impact force during the screening process, so that the screen drum 4 can work more stably, thereby improving the screening efficiency. The buffer spring 10 can absorb vibrations and impact forces, protect the screen drum 4 and the entire screening mechanism from damage, and extend the service life of the equipment. The stable screening process can ensure that only fine particles that meet the requirements pass through the screen drum 4, further improving product quality and cleanliness.

[0040] In a further preferred embodiment of the present invention, a guide rod 12 is fixedly installed at the bottom of the annular seat 9, a guide cylinder 13 is fixedly installed at the top of the bottom plate 11, the guide cylinder 13 is slidably connected to the guide rod 12, and one side of the guide cylinder 13 is in contact with the screen cylinder 4.

[0041] In this embodiment, when the screen drum 4 moves up and down in the barrel 3, the guide rod 12 slides in the guide cylinder 13, providing a stable guiding effect for the up and down movement of the screen drum 4. Since one side of the guide cylinder 13 is in contact with the screen drum 4, this design not only further enhances the stability of the screen drum 4, but also limits the horizontal displacement of the screen drum 4, thereby ensuring the accuracy of the screening process. The buffer spring 10 continues to play its buffering role to absorb the vibration and impact force during the screening process, while the combination of the guide rod 12 and the guide cylinder 13 ensures the stable movement of the screen drum 4 in the vertical direction. The displacement of the screen drum 4 is limited by the combination of the guide rod 12 and the guide cylinder 13, thereby ensuring the accuracy of the screening process, thereby improving the screening accuracy. By providing stable guidance and limiting displacement for the screen drum 4, this design enhances the stability of the screen drum 4 during the screening process, enabling it to work more efficiently.

[0042] In a further preferred embodiment of the present invention, a mounting box 14 is fixedly installed in the screen cylinder 4, a bidirectional screw 15 is rotatably installed in the mounting box 14, both ends of the bidirectional screw 15 are threadedly sleeved with a holder 16, a group of the holders 16 are respectively slidably connected to the two sides of the screen cylinder 4, a slot is provided on one side of the guide cylinder 13, the slot is in sliding contact with the holder 16, a handle 17 and a connecting frame 18 are rotatably installed on the top of the mounting box 14, and a first bevel gear 19 is fixedly installed on the handle 17, the output rod of the connecting frame 18 and the bidirectional screw 15, and a plurality of the first bevel gears 19 are meshed with each other.

[0043] In this embodiment, when the handle 17 is rotated, the first bevel gear 19 on the handle 17 is meshed with the first bevel gear 19 on the bidirectional screw 15, so the bidirectional screw 15 will rotate accordingly. Since the two ends of the bidirectional screw 15 are threadedly sleeved with a holder 16, the holder 16 will move to the two ends or the middle according to the rotation direction of the bidirectional screw 15. When the holder 16 moves to the slot position on one side of the guide cylinder 13, the holder 16 will slide in contact with the slot, thereby fixing the position of the screen cylinder 4 and ensuring that the screen cylinder 4 is fixed on the guide cylinder 13 to prevent it from detaching from the guide cylinder 13 during the screening process. Through the cooperation between the holder 16 and the slot of the guide cylinder 13, the screen cylinder 4 is fixed to prevent it from detaching from the guide cylinder 13 during the screening process, thereby improving the stability and accuracy of the screening. The position of the holder 16 can be easily adjusted by rotating the handle 17, thereby realizing the loading and unloading operations of the screen cylinder 4, simplifying the installation process and improving work efficiency.

[0044] In a further preferred embodiment of the present invention, a ring plate 20 is fixedly mounted on the top of the installation box 14, a screw rod 21 is threadedly mounted on the connecting frame 18, and anti-skid pads are installed on both the screw rod 21 and the ring plate 20, and the two anti-skid pads are in contact with each other.

[0045] In this embodiment, when the connecting frame 18 is rotated to a position in contact with the annular plate 20, the anti-skid pad on the screw rod 21 will contact the anti-skid pad on the annular plate 20. The main purpose of this design is to prevent the connecting frame 18 from rotating by itself when no external force is applied, thereby maintaining the stationary state of the bidirectional screw 15 and ensuring the stability of the position of the screen drum 4. The screw rod 21 is installed on the connecting frame 18 by means of threads, which means that the user can adjust the pressure between it and the annular plate 20 by rotating the screw rod 21, thereby further controlling the friction between the anti-skid pads. When the connecting frame 18 needs to be fixed, it is only necessary to rotate the screw rod 21 to make it in close contact with the annular plate 20. When the coupling frame 18 needs to be adjusted, When the connecting frame 18 is in position, the screw rod 21 is rotated in the opposite direction to reduce the friction so that the connecting frame 18 can be easily rotated. By increasing the design of the annular plate 20 and the screw rod 21, the connecting frame 18 is effectively prevented from rotating by itself when not acted upon by external forces, thereby improving the stability of the position of the screen drum 4 and ensuring the accuracy of the screening process. The design of the anti-slip pad not only increases the friction between the screw rod 21 and the annular plate 20, but also prevents the user from slipping during operation, thereby improving the safety of the equipment. The screw rod 21 is installed on the connecting frame 18 through threads, so that the user can easily adjust the pressure between it and the annular plate 20, thereby realizing flexible control of the position of the connecting frame 18.

[0046] In a further preferred embodiment of the present invention, the scraper mechanism includes: a connecting box 22 fixedly mounted on the inner wall of the barrel 3; a scraper 23 rotatably mounted on the bottom of the connecting box 22, and the scraper 23 is in rotational contact with the inner wall of the barrel 3; a second rotating rod 24 rotatably mounted on one side of the inner wall of the barrel 3, the second rotating rod 24 is located in the connecting box 22, and a second bevel gear 25 is fixedly mounted on the output rod of the second rotating rod 24 and the scraper 23, and the two second bevel gears 25 are meshed with each other; sprockets 26 fixedly mounted on the first rotating rod 6 and the second rotating rod 24, respectively; a chain 27 mounted on a group of the sprockets 26, and the chain 27 is meshed with a group of the sprockets 26.

[0047] In this embodiment, when the first rotating rod 6 is driven to rotate, it drives the sprocket 26 connected thereto to rotate, and the chain 27 serves as a transmission medium to transmit the rotational motion of the first rotating rod 6 to the second rotating rod 24, and the rotational motion of the second rotating rod 24 is transmitted to the output rod of the scraper 23 through two meshing second bevel gears 25, thereby driving the scraper 23 to rotate on the inner wall of the barrel 3. As the scraper 23 rotates, it continuously scrapes off the material attached to the inner wall of the barrel 3. At the same time, the bottom of the scraper 23 extends into the feed pipe 2, thereby ensuring that the material will not be blocked in the feed pipe 2. In order to ensure that the material can be smoothly discharged into the injection molding machine body 1, the scraper 23 can rotate synchronously with the rotation of the screen drum 4 through the transmission of the chain 27 and the second bevel gear 25, so as to efficiently scrape off the material attached to the inner wall of the barrel 3, avoiding the waste and blockage of the material. The design of the scraper mechanism makes full use of the internal space of the barrel 3, making the whole equipment structure more compact, small in footprint, easy to install and maintain, and the continuous scraping action of the scraper mechanism ensures that the material can be smoothly screened through the screen drum 4, thereby improving the screening efficiency and accuracy.

[0048] In a further preferred embodiment of the present invention, a placement groove is provided on the top of the annular seat 9, a guide bucket 28 is placed on the placement groove, a discharge port of the guide bucket 28 is located in the screen cylinder 4, a fixing bolt 29 is threadedly installed on the guide bucket 28, and the fixing bolt 29 is threadedly connected to the guide bucket 28.

[0049] In this embodiment, the material is first poured into the guide bucket 28. Since the discharge port of the guide bucket 28 is directly aligned with the interior of the screen drum 4, the material can smoothly slide along the inner wall of the guide bucket 28 into the screen drum 4, avoiding waste and scattering of the material. The fixing bolts 29 are threadedly connected to firmly fix the guide bucket 28 to the placement groove of the annular seat 9. This fixing method is not only simple and reliable, but also easy to disassemble and replace the guide bucket 28 to adapt to changes in different materials or screening requirements. The design of the guide bucket 28 enables the material to accurately fall into the screen drum 4, avoiding waste and scattering of the material, thereby improving the screening efficiency. Through the fixing effect of the fixing bolts 29, the guide bucket 28 can be firmly installed on the annular seat 9, enhancing the stability of the entire equipment and preventing the equipment from loosening or damage due to material impact or vibration during operation. The threaded connection method of the fixing bolts 29 makes the disassembly and replacement of the guide bucket 28 simple and quick, which is convenient for users to maintain and service the equipment.

[0050] In a further preferred embodiment of the present invention, a limiting member 30 is installed on the feed pipe 2 and the barrel 3, and the limiting member 30 is composed of two arc plates and a plurality of arc clamping plates. Arc clamping grooves are provided on the feed pipe 2 and the barrel 3, and the plurality of arc clamping grooves are matched with the plurality of arc clamping plates.

[0051] In this embodiment, when connecting the feed pipe 2 and the barrel 3, first, two arc plates are respectively attached to the outer walls of the feed pipe 2 and the barrel 3, and multiple arc clamps are inserted into the corresponding arc grooves one by one. Since the shapes and sizes of the arc clamps and the arc grooves are completely matched, they can be tightly combined together to form a stable connection structure. Once the arc clamps are fully inserted into the arc grooves, they will effectively limit the relative movement between the feed pipe 2 and the barrel 3. This limiting effect not only enhances the stability of the connection, but also prevents the connection from loosening or falling off due to material impact or vibration. In addition to the limiting effect, the limiting member 30 can also provide a certain sealing effect. Due to the close fit between the arc plate and the arc clamping plate, as well as between them and the feed pipe 2 and the barrel 3, a relatively closed space is formed, thereby reducing the possibility of material leakage from the connection. Through the design of the limiter 30, a stable connection between the feed pipe 2 and the barrel 3 is achieved, and the stability of the entire equipment is enhanced. The close fitting structure of the limiter 30 reduces the possibility of material leakage from the connection and improves the sealing of the equipment. The modular design of the limiter 30 makes installation and maintenance simpler and faster, and reduces the difficulty and cost of operation.

[0052] In a further preferred embodiment of the present invention, a fixing block 31 is fixedly installed on one side of the two arc-shaped plates, and connecting bolts 32 are threadedly installed on the two fixing blocks 31 .

[0053] In this embodiment, the fixing block 31 is firmly mounted on one side of the two arc-shaped plates, which serve as support points for the connecting bolts 32, ensuring that the connecting bolts 32 can stably pass through the two arc-shaped plates and be threadedly connected to the fixing block 31 on the opposite side. When the two arc-shaped plates are respectively fitted on the outer walls of the feed pipe 2 and the barrel 3, and the arc-shaped clamping plates have been inserted into the corresponding arc-shaped clamping grooves, the user can gradually tighten and firmly connect the two fixing blocks 31 by rotating the connecting bolts 32. In this process, the clamping force generated by the connecting bolts 32 will further compress the two arc-shaped plates, making them fit more closely on the feed pipe 2 and the barrel 3, thereby enhancing the stability of the connection. In order to prevent the connecting bolt 32 from loosening due to vibration during operation, anti-loosening washers or locking screws and other anti-loosening measures can be added to the connecting bolt 32. Through the design of the fixing block 31 and the connecting bolt 32, a more stable connection between the feed pipe 2 and the barrel 3 is achieved, and the structural strength of the entire equipment is enhanced. The stable connection structure reduces the risk of equipment failure or safety accidents caused by loose connection, and improves the safety and reliability of the equipment. Although the structure of the fixing block 31 and the connecting bolt 32 is increased, this design still maintains good maintainability. When it is necessary to disassemble or replace parts, the user only needs to loosen the connecting bolt 32 to easily complete the operation.

[0054] In a further preferred embodiment of the present invention, handles are fixedly mounted on the guide bucket 28 and the mounting box 14, and the top of the annular seat 9 is arranged in an inclined shape.

[0055] In this embodiment, the handle on the guide bucket 28 is convenient for the user to carry, move or adjust the position of the guide bucket 28, especially when the guide bucket 28 needs to be cleaned or replaced, the handle design makes the operation easier and more convenient, and the handle on the mounting box 14 is also convenient for the user to replace or clean the screen drum 4, especially when the entire screening device needs to be moved to a different position or for maintenance, the handle provides additional convenience, and the inclined design of the annular seat 9 allows the material to be more smoothly distributed when falling into the screen drum 4, reducing the possibility of material accumulation or blockage. At the same time, the inclined design also helps to optimize the overall layout of the equipment, making the entire screening device more compact and beautiful visually. The handle design makes it easier and more convenient for the user to carry, move or adjust the guide bucket 28 and the mounting box 14, thereby improving the operating efficiency of the equipment, and the inclined design of the annular seat 9 allows the material to fall more smoothly into the screen drum 4 for screening, reducing the risk of material accumulation and blockage, thereby improving the screening efficiency.

[0056] In order to further improve the use effect of the device, in addition to the above scheme, this scheme also has the following embodiments:

[0057] In another embodiment of the present invention, a discharge box 33 is fixedly installed on one side of the barrel 3, and a feed port is provided on the discharge box 33 and one side of the barrel 3, and the two feed ports are communicated with each other. A push plate 34 is slidably provided in the discharge box 33, and a threaded barrel 35 is rotatably installed on one side of the discharge box 33. A threaded rod 36 is threadedly installed on the threaded barrel 35, and the threaded rod 36 is fixedly connected to one side of the push plate 34. A second motor 37 is fixedly installed on one side of the discharge box 33, and a third bevel gear 38 is fixedly sleeved on the output shaft of the second motor 37 and the threaded barrel 35, and the two third bevel gears 38 are meshed with each other.

[0058] In this embodiment, when it is necessary to pour viscous raw materials into the barrel 3, the user can pour the raw materials into the discharge box 33. Since the discharge box 33 is connected to the feed port of the barrel 3, the raw materials can flow smoothly into the barrel 3, avoiding direct contact with the screen drum 4, thereby reducing the risk of material adhesion and blockage. The push plate 34 is slidably arranged in the discharge box 33 to control the discharge speed of the material. When it is necessary to discharge the material, the user can start the second motor 37 so that the output shaft of the second motor 37 drives the third bevel gear 38 to rotate, so that the third bevel gear 38 drives the threaded barrel 35 to rotate, and then drives the threaded rod 36 and the push plate 3 4 slides along the inner wall of the discharge box 33, so that the push plate 34 can gradually push the material in the discharge box 33 to the feed port of the barrel 3 to achieve uniform discharge of the material. By designing the discharge box 33 and its related components, an optimized process of pouring viscous raw materials into the barrel 3 is achieved, which not only avoids direct contact between the material and the screen drum 4, reduces the risk of material adhesion and clogging, but also improves the feeding efficiency and accuracy. Through the design of components such as the second motor 37 and the third bevel gear 38, automatic control of the push plate 34 is achieved, which not only reduces the difficulty and cost of manual operation, but also improves the intelligence level and automation level of the equipment.

[0059] In another embodiment of the present invention, a discharge hopper is installed on the top of the discharge box 33, a cover is threadedly installed on the discharge hopper, a limiting cylinder 39 is installed on the bottom of the discharge box 33, and a limiting rod is installed on the top of the injection molding machine body 1, and the limiting rod is slidably connected to the limiting cylinder 39.

[0060] In this embodiment, the design of the discharge hopper allows the user to pour the raw materials into the discharge box 33 more conveniently, avoiding the scattering and waste of raw materials during the pouring process. The design of the lid is used to close the discharge hopper when discharge is not required to prevent dust, debris, etc. from entering the discharge box 33, ensuring the cleanliness of the raw materials and the hygiene of the equipment. The lid and the discharge hopper are threadedly connected to ensure the tightness and stability of the connection, avoiding the risk of the lid falling off under vibration or impact. The limit cylinder 39 is installed at the bottom of the discharge box 33 to position and support the discharge box 33 to prevent it from shaking or shifting during operation. The design of the discharge hopper makes the pouring of raw materials more convenient, and the design of the lid ensures the hygiene of the equipment and the cleanliness of the raw materials. These improvements not only enhance the user's operating experience, but also reduce the maintenance cost of the equipment. The cooperation of the limit cylinder 39 and the limit rod is conducive to stabilizing the discharge box 33 on the top of the injection molding machine body 1, enhancing its practicality and flexibility.

[0061] In summary, compared with related technologies, this device improves production efficiency, product quality and cleanliness by optimizing the screening structure and scraping mechanism in the barrel, and is suitable for the high requirements for plastic products in the medical field.

[0062] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A plastic injection molding machine, characterized in that: include: An injection molding machine body (1), the injection molding machine body (1) further comprising a feed pipe (2), the feed pipe (2) being provided with a barrel (3); A sieve cylinder (4) disposed in the material cylinder (3) and used for sieving materials; A connecting frame (5) disposed below the screen drum (4); A first rotating rod (6) is rotatably mounted on one side of the barrel (3), wherein the first rotating rod (6) and the connecting frame (5) are both provided with connecting rods (7), and a group of the connecting rods (7) are hingedly connected; A first motor (8) fixedly mounted on one side of the barrel (3) for driving a connecting rod (7) to drive the connecting frame (5) to slide up and down, wherein an output shaft of the first motor (8) is fixedly connected to the first rotating rod (6); A scraping mechanism is provided in the barrel (3) and is used to scrape off raw materials adhering to the inner wall of the barrel (3).

2. The plastic injection molding machine according to claim 1, characterized in that: An annular seat (9) is fixedly installed in the barrel (3), and the annular seat (9) is located above the screen barrel (4). A buffer spring (10) is fixedly installed at the bottom of the annular seat (9), and a bottom plate (11) is installed at the bottom end of the buffer spring (10), and the bottom plate (11) is fixedly connected to the connecting frame (5).

3. The plastic injection molding machine according to claim 2, characterized in that: A guide rod (12) is fixedly mounted on the bottom of the annular seat (9), a guide cylinder (13) is fixedly mounted on the top of the bottom plate (11), the guide cylinder (13) is slidably connected to the guide rod (12), and one side of the guide cylinder (13) is in contact with the screen cylinder (4).

4. The plastic injection molding machine according to claim 3, characterized in that: A mounting box (14) is fixedly installed in the screen cylinder (4), a bidirectional screw (15) is rotatably installed in the mounting box (14), both ends of the bidirectional screw (15) are threadedly sleeved with a holder (16), a group of the holders (16) are respectively slidably connected with the two sides of the screen cylinder (4), a slot is opened on one side of the guide cylinder (13), the slot is in sliding contact with the holder (16), a handle (17) and a connecting frame (18) are rotatably installed on the top of the mounting box (14), the handle (17), the output rod of the connecting frame (18) and the bidirectional screw (15) are all fixedly installed with a first bevel gear (19), and a plurality of the first bevel gears (19) are meshed with each other.

5. The plastic injection molding machine according to claim 4, characterized in that: An annular plate (20) is fixedly mounted on the top of the installation box (14), a screw rod (21) is threadedly mounted on the connection frame (18), and anti-skid pads are mounted on both the screw rod (21) and the annular plate (20), and the two anti-skid pads are in contact with each other.

6. The plastic injection molding machine according to claim 1, characterized in that: The scraping mechanism comprises: a connecting box (22) fixedly mounted on the inner wall of the barrel (3); Rotating a scraper (23) mounted on the bottom of the connection box (22), wherein the scraper (23) is in rotational contact with the inner wall of the barrel (3); A second rotating rod (24) is rotatably mounted on one side of the inner wall of the barrel (3), the second rotating rod (24) is located in the connecting box (22), and a second bevel gear (25) is fixedly mounted on the second rotating rod (24) and the output rod of the scraper (23), and the two second bevel gears (25) are meshed with each other; Sprocket wheels (26) are fixedly mounted on the first rotating rod (6) and the second rotating rod (24) respectively; A chain (27) is sleeved on a group of sprocket wheels (26), and the chain (27) is meshed with the group of sprocket wheels (26).

7. The plastic injection molding machine according to claim 4, characterized in that: A placement groove is provided on the top of the annular seat (9), a guide bucket (28) is placed on the placement groove, a discharge port of the guide bucket (28) is located in the screen drum (4), a fixing bolt (29) is threadedly installed on the guide bucket (28), and the fixing bolt (29) is threadedly connected to the guide bucket (28).

8. The plastic injection molding machine according to claim 1, characterized in that: A limiting member (30) is installed on the feed pipe (2) and the barrel (3), and the limiting member (30) is composed of two arc-shaped plates and a plurality of arc-shaped clamping plates. The feed pipe (2) and the barrel (3) are both provided with arc-shaped clamping grooves, and the plurality of arc-shaped clamping grooves are adapted to the plurality of arc-shaped clamping plates.

9. The plastic injection molding machine according to claim 8, characterized in that: A fixing block (31) is fixedly mounted on one side of the two arc-shaped plates, and connecting bolts (32) are threadedly mounted on the two fixing blocks (31).

10. The plastic injection molding machine according to claim 7, characterized in that: The guide bucket (28) and the installation box (14) are both fixedly mounted with handles, and the top of the annular seat (9) is arranged in an inclined shape.

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