A screw cleaning structure and an injection molding machine

Abstract

This invention provides a screw cleaning structure and an injection molding machine, belonging to the field of injection molding machine technology. It includes a base, a movable seat, a sealing structure, and a cleaning component. The base is fixedly mounted on the barrel and has a channel communicating with the internal space of the barrel. The movable seat is slidably mounted on the base and has a first station and a second station. The sealing structure includes a first sealing member and a second sealing member. Both the first and second sealing members are slidably mounted on the movable seat and have degrees of freedom to move towards and away from the barrel. The cleaning component is mounted on the second sealing member and has an elastic degree of freedom to move into the barrel. This invention provides a screw cleaning structure that can clean material from the screw without disassembling it, and the second sealing member structure ensures reliable sealing during the cleaning process, preventing melt leakage or external contamination.

Description

Technical Field

[0001] This invention belongs to the field of injection molding machine technology, and more specifically, relates to a screw cleaning structure and an injection molding machine. Background Technology

[0002] An injection molding machine is a device that uses plastic molding technology to manufacture products. An injection molding machine includes a barrel, inside which is a rotatable and axially movable screw. The screw sequentially includes a feeding section, a compression section, and a homogenization section. During operation, the plastic raw material is conveyed and heated to melt and plasticize within the barrel by the screw. Then, it is axially propelled by the screw and injected through a nozzle into the closed mold cavity, where the melt cools and solidifies, ultimately forming a plastic product conforming to the shape of the cavity.

[0003] The material in the screw homogenization section experiences decreased thermal stability due to prolonged exposure to high temperatures and cyclical thermal processes, making it prone to thermal degradation and carbonization. The accumulation and periodic peeling of carbonization products, injected into the mold cavity along with the melt, can lead to black spots or performance defects in the finished product. Summary of the Invention

[0004] The purpose of this invention is to provide a screw cleaning structure and an injection molding machine, which aims to reduce the carbonization of materials on the screw homogenization section.

[0005] In a first aspect, the present invention provides a screw cleaning structure, comprising:

[0006] The base is fixedly mounted on the material cylinder and has a channel communicating with the internal space of the material cylinder;

[0007] A movable seat is slidably mounted on a base and has a first working position and a second working position;

[0008] A sealing structure includes a first sealing member and a second sealing member; both the first sealing member and the second sealing member are slidably disposed on the movable seat and each has the freedom to move toward and away from the material cylinder; and

[0009] The cleaning component is disposed on the second sealing component and has an elastic degree of freedom to move into the barrel;

[0010] When the movable seat is in the first working position, the first sealing member faces the channel so that the first sealing member can be driven to move and close the channel; when the movable seat is in the second working position, the second sealing member faces the channel so that the second sealing member can be driven to move and close the channel, and the cleaning member abuts against the screw inside the barrel.

[0011] In one possible implementation, the cleanup component includes:

[0012] The mounting slider is slidably disposed on the second closure member along the radial direction of the material cylinder;

[0013] The cleaning scraper is detachably mounted on the mounting slider.

[0014] A spring, with its two ends connected to the mounting slider and the second closure respectively, is used to provide an elastic force for the cleaning scraper to move toward the screw.

[0015] In one possible implementation, the cleaning scraper is coplanar with the screw, and the end of the cleaning scraper facing the screw is tapered.

[0016] In one possible implementation, the sliding direction of the mounting slider is defined as a first direction, and the direction perpendicular to the first direction is defined as a second direction;

[0017] The cleaning scraper is provided with multiple sets of through holes distributed along the first direction, and the number of through holes increases in a group from the direction away from the screw.

[0018] The maximum dimension of each of the through holes in the second direction is smaller than the thread width of the screw.

[0019] The two adjacent through holes in the first direction are staggered, and their projections in the second direction overlap.

[0020] In one possible implementation, the mounting slider has a groove, and the cleaning scraper is inserted into the groove by an interference fit.

[0021] In one possible implementation, the base is provided with a slide rail, and the movable seat is slidably connected to the slide rail;

[0022] A first hydraulic cylinder is fixedly installed on the base, and the telescopic end of the first hydraulic cylinder is connected to the movable seat to drive the movable seat to switch between the first work position and the second work position.

[0023] In one possible implementation, a second hydraulic cylinder is fixedly disposed on the base below the movable seat, the piston rod of the second hydraulic cylinder faces the channel, and a connecting block is fixedly disposed on the piston rod;

[0024] The movable seat has an elongated clearance hole, through which the piston rod passes. When the movable seat moves, the piston rod moves relative to the clearance hole.

[0025] The first sealing member has a first connecting groove. When the movable seat is in the first working position, the connecting block engages with the first connecting groove so that the piston rod can drive the first sealing member to move.

[0026] The second sealing member has a second connecting groove. When the movable seat is in the second working position, the connecting block engages with the second connecting groove so that the piston rod can drive the second sealing member to move.

[0027] In one possible implementation, the movable seat is provided with a first guide groove suitable for the sliding of the first closure member and a second guide groove suitable for the sliding of the second closure member;

[0028] When the movable seat is in the first working position, the first guide groove is connected to the channel;

[0029] When the movable seat is in the second working position, the second guide groove is connected to the channel.

[0030] In one possible implementation, the channel is configured as a tapered hole that gradually narrows toward the inside of the barrel, wherein the first closure and the second closure are both frustum-shaped structures adapted to the tapered hole, and each end facing into the barrel has an arc-shaped sealing surface adapted to the inner wall of the barrel.

[0031] The screw cleaning structure provided by this invention offers the following advantages compared to existing technologies: When the injection molding machine is running normally, the moving seat is in the first position, and the first sealing member faces the channel. At this time, the first sealing member can be moved by external drive to close the channel, maintaining the sealing of the barrel and normal production. When screw cleaning is required, the moving seat is driven to switch to the second position, so that the second sealing member faces the channel. The second sealing member is driven to move and close the channel, while the cleaning member extends into the barrel under elastic action and abuts against the screw surface. As the screw rotates and moves axially, the cleaning member continuously scrapes off the material adhering to its homogenization section, preventing these materials from carbonizing under long-term high temperature.

[0032] After cleaning, the movable seat returns to the first station, the first sealing component re-closes the channel, and the injection molding machine resumes normal production. The screw cleaning structure of this invention eliminates the need to disassemble the screw, significantly improving equipment utilization and maintenance efficiency. Furthermore, the second sealing component ensures reliable sealing during the cleaning process, preventing melt leakage or external contamination. This not only extends the screw's service life but also reduces the risk of material thermal degradation through regular cleaning, improving the quality and consistency of plastic products and meeting the high standards required for injection molding.

[0033] Secondly, the present invention provides an injection molding machine including the above-described screw cleaning structure.

[0034] The injection molding machine provided by this invention extends the service life of the screw by adopting the above-mentioned screw cleaning structure. It also reduces the risk of material thermal degradation through regular cleaning, improves the quality and consistency of plastic products, and meets the high standards required for injection molding. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the overall structure of the screw cleaning structure provided in an embodiment of the present invention.

[0037] Figure 2 This is a first cross-sectional view of the screw cleaning structure provided in an embodiment of the present invention.

[0038] Figure 3 This is a second cross-sectional view of the screw cleaning structure provided in an embodiment of the present invention.

[0039] Figure 4 This is a third sectional view of the screw cleaning structure provided in an embodiment of the present invention.

[0040] In the diagram: 1. Base; 11. Slide rail; 21. Barrel; 22. Screw; 3. Channel; 4. Moving seat; 41. Clearance hole; 421. First guide groove; 422. Second guide groove; 51. First sealing member; 511. First connecting groove; 52. Second sealing member; 521. Second connecting groove; 522. Slide groove; 523. Limiting protrusion; 6. Cleaning member; 61. Mounting slider; 611. Embedded groove; 62. Cleaning scraper; 621. Through hole; 63. Spring; 71. First hydraulic cylinder; 72. Second hydraulic cylinder; 721. Connecting block. Detailed Implementation

[0041] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention 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 invention and are not intended to limit the present invention.

[0042] The homogenization section of an injection molding machine screw, due to its shallowest screw groove depth, experiences the most intense shearing action on the melt, easily generating excessive frictional heat. Simultaneously, because the homogenization section is adjacent to the nozzle, the melt flow path is restricted, easily forming stagnation points during injection intervals. This causes melt to adhere to the screw for extended periods. Under prolonged exposure to high temperatures, this adhered material undergoes thermal degradation and carbonization. The accumulation and periodic peeling of these carbonized products are injected into the mold cavity with the melt, resulting in black spots on the finished product and a decline in product quality. The screw cleaning structure provided by this invention can clean the material adhering to the screw, achieving material removal before thermal degradation and carbonization occur, thus reducing material waste.

[0043] Please see Figure 1 and Figure 2 The present invention will now describe a screw cleaning structure. A screw cleaning structure includes a base 1, a movable seat 4, a sealing structure, and a cleaning component 6. The base 1 is fixedly disposed below a barrel 21 and has a channel 3 communicating with the internal space of the barrel 21. The movable seat 4 is slidably disposed on the base 1 and has a first working position and a second working position. The sealing structure includes a first sealing member 51 and a second sealing member 52. Both the first sealing member 51 and the second sealing member 52 are slidably disposed on the movable seat 4 and each has a degree of freedom to move towards and away from the barrel 21. The cleaning component 6 is disposed on the second sealing member 52 and has an elastic degree of freedom to move into the barrel 21.

[0044] When the movable seat 4 is in the first working position, the first sealing member 51 faces the channel 3 so that the first sealing member 51 can be driven to move and close the channel 3. When the movable seat 4 is in the second working position, the second sealing member 52 faces the channel 3 so that the second sealing member 52 can be driven to move and close the channel 3, and the cleaning member 6 abuts against the screw 22 inside the barrel 21.

[0045] When the injection molding machine is in normal production, the moving seat 4 switches to the first station. At this time, the first sealing member 51 is facing the channel 3. The first sealing member 51 is driven to move towards the barrel 21 to completely seal the channel 3, so as to prevent the leakage of high temperature melt in the barrel 21, pressure loss or external impurities from entering, and to ensure that the conveying and plasticizing process of plastic raw materials in the feeding section, compression section and homogenization section is not affected.

[0046] When it is necessary to clean the material adhering to the screw 22, the first sealing member 51 is first driven to move away from the barrel 21 to open the channel 3. Then, the moving seat 4 is driven to slide to the second station, so that the second sealing member 52 faces the channel 3. Subsequently, the second sealing member 52 is driven to move towards the barrel 21 to close the channel 3. At the same time, the cleaning member 6 automatically moves closer to the screw 22 and abuts tightly under the action of elastic force. Subsequently, the screw 22 maintains normal rotation and axial movement, and the cleaning member 6 always adheres to the circumferential surface of the screw 22 under the action of elastic force, continuously scraping off the material adhering to the homogenization section as the screw 22 moves.

[0047] After cleaning, the second sealing member 52 is driven back, the movable seat 4 returns to the first station, and the first sealing member 51 closes the channel 3 again, allowing the injection molding machine to resume production. The screw cleaning structure of this invention eliminates the need to disassemble the barrel 21 and screw 22, significantly reducing production interruption time. The switching of the dual sealing members ensures the sealing of the barrel 21 during both the cleaning and production stages, maintaining the temperature and pressure environment required for plasticization.

[0048] In some possible embodiments, please refer to Figure 3 The cleaning component 6 includes a mounting slider 61, a cleaning scraper 62, and a spring 63. The mounting slider 61 is slidably mounted on the second closure 52 along the radial direction of the barrel 21. The cleaning scraper 62 is detachably mounted on the mounting slider 61. The two ends of the spring 63 are connected to the mounting slider 61 and the second closure 52, respectively, to provide an elastic force for the cleaning scraper 62 to move toward the screw 22.

[0049] Specifically, a groove 522 is provided on the second closure 52 for the mounting slider 61 to slide, and the mounting slider 61 is slidably connected to the groove 522. A limiting protrusion 523 is provided on the inner wall of the groove 522, which limits the range of movement of the mounting slider 61 and prevents the spring 63 from being over-compressed due to excessive movement of the mounting slider 61.

[0050] It should be noted that the cleaning scraper 62 is made of nylon, which ensures cleaning effectiveness while preventing scratches on the screw 22. Furthermore, the cleaning scraper 62 can be replaced when it becomes heavily worn.

[0051] The mounting slider 61 is slidably mounted on the second sealing member 52 along the radial direction of the material cylinder 21. The cleaning scraper 62 is detachably fixed on the side of the mounting slider 61 facing the screw 22. The two ends of the spring 63 are respectively connected to the mounting slider 61 and the second sealing member 52, and are always in a compressed state.

[0052] When the movable seat 4 switches to the second station and the second sealing member 52 closes the channel 3, the elastic force of the spring 63 pushes the mounting slider 61 to slide towards the screw 22, and drives the cleaning scraper 62 to move synchronously until the cleaning scraper 62 is in close contact with the homogenization section surface of the screw 22. During the rotation and axial movement of the screw 22, the cleaning scraper 62 directly contacts the material on the surface of the screw 22, scraping the material off. Because the spring 63 continuously provides elastic force, when the threads on the screw 22 contact the cleaning scraper 62, the mounting slider 61 can slide radially adaptively, so that the cleaning scraper 62 always fits against the screw 22, ensuring the cleaning effect while avoiding rigid collision between the cleaning scraper 62 and the screw 22.

[0053] In some possible embodiments, please refer to Figure 2 and Figure 3 The cleaning scraper 62 is coplanar with the screw 22, and the end of the cleaning scraper 62 facing the screw 22 is tapered.

[0054] As the screw 22 rotates, the conical cleaning scraper 62 can adapt to the threads on the screw 22 and retract into the second sealing member 52 under the squeezing action of the threads, thus avoiding direct rigid collision with the threads.

[0055] In some possible embodiments, please refer to Figure 3 The sliding direction of the mounting slider 61 is defined as the first direction, and the direction perpendicular to the first direction is defined as the second direction. The cleaning scraper 62 has multiple sets of through holes 621 distributed along the first direction, with the number of through holes 621 increasing progressively in the direction away from the screw 22. The maximum dimension of each through hole 621 in the second direction is smaller than the thread width of the screw 22. Two adjacent through holes 621 in the first direction are staggered, and their projections in the second direction overlap.

[0056] When disassembling the cleaning scraper 62, workers can use tools such as screwdrivers to pass through the through hole 621, making it easy to install or remove the cleaning scraper 62. Furthermore, when the cleaning scraper 62 is worn, the presence of the through hole 621 causes the end of the cleaning scraper 62 facing the screw 22 to have an uneven shape, thereby reducing the contact area with the screw 22, increasing the cleaning force, and providing a better cleaning effect on the material on the screw 22.

[0057] In some possible embodiments, please refer to Figure 3 The mounting slider 61 has a groove 611, and the cleaning scraper 62 is inserted into the groove 611 by interference fit.

[0058] When assembling the cleaning scraper 62, the operator holds the non-tapered end of the scraper 62, aligns it with the opening of the groove 611, and applies pressure to force the scraper 62 into the groove 611. The clamping force generated by the interference fit firmly fixes the scraper 62 to the mounting slider 61, eliminating the need for bolts, screws, or other additional fasteners. When the scraper 62 is severely worn and needs replacement, it can be easily pulled out by using a screwdriver or similar tool through the through hole 621. Compared to traditional threaded connections, the interference fit allows for basic operations without tools, significantly reducing maintenance time. The interference fit also eliminates any loosening gaps, ensuring reliable fixation.

[0059] In some possible embodiments, please refer to Figure 2 The base 1 is provided with a slide rail 11, which extends in a direction perpendicular to the axis of the material cylinder 21. The movable seat 4 is slidably connected to the slide rail 11. A first hydraulic cylinder 71 is fixedly installed on the base 1. The telescopic end of the first hydraulic cylinder 71 is connected to the movable seat 4 to drive the movable seat 4 to switch between the first working position and the second working position.

[0060] It should be noted that the first hydraulic cylinder 71 is controlled by a control system.

[0061] The control system sends a signal, causing the piston rod of the first hydraulic cylinder 71 to extend, pushing the movable seat 4 to slide along the slide rail 11 towards the second workstation. The slide rail 11 guides the movement of the movable seat 4, preventing deviation during sliding. When the movable seat 4 reaches the second workstation, the piston rod of the first hydraulic cylinder 71 stops extending and retracting, and the position is locked by a hydraulic lock. When cleaning is complete and resetting is required, the piston rod of the first hydraulic cylinder 71 retracts, pulling the movable seat 4 back to the first workstation along the slide rail 11. Throughout the sliding process, the cooperation between the slide rail 11 and the movable seat 4 reduces the frictional resistance of the movable seat 4, making the sliding smoother, while limiting the deviation of the movable seat 4 and ensuring the alignment accuracy of the first sealing member 51 and the second sealing member 52 with the channel 3.

[0062] In some possible embodiments, please refer to Figure 2 , Figure 3 and Figure 4 A second hydraulic cylinder 72 is fixedly installed on the base 1 below the movable seat 4. The piston rod of the second hydraulic cylinder 72 faces the channel 3, and a connecting block 721 is fixedly installed on the piston rod. The movable seat 4 has an elongated relief hole 41. The piston rod passes through the relief hole 41. When the movable seat 4 moves, the piston rod moves relative to the relief hole 41.

[0063] The first sealing member 51 has a first connecting groove 511. When the movable seat 4 is in the first position, the connecting block 721 engages with the first connecting groove 511 so that the piston rod can drive the first sealing member 51 to move. The second sealing member 52 has a second connecting groove 521. When the movable seat 4 is in the second position, the connecting block 721 engages with the second connecting groove 521 so that the piston rod can drive the second sealing member 52 to move.

[0064] It should be noted that the connecting block 721 is a dovetail block, and the first connecting groove 511 and the second connecting groove 521 are dovetail grooves.

[0065] When the movable seat 4 is in the first working position, the first connecting groove 511 of the first sealing member 51 is connected to the connecting block 721. At this time, the piston rod of the second hydraulic cylinder 72 is driven to extend and retract, which can drive the first sealing member 51 to slide in the direction towards or away from the material cylinder 21 through the connecting block 721, thereby realizing the closing and opening of the channel 3. When it is necessary to switch working positions, the piston rod of the second hydraulic cylinder 72 is first driven to retract, causing the first sealing member 51 to retract, and then the movable seat 4 is driven to slide to the second working position. During this process, the piston rod of the second hydraulic cylinder 72 moves relative to the sliding of the movable seat 4 within the clearance hole 41, and the connecting block 721 disengages from the first connecting groove 511. When the movable seat 4 reaches the second working position, the second connecting groove 521 of the second sealing member 52 is connected to the connecting block 721. At this time, the piston rod of the second hydraulic cylinder 72 is driven to extend and retract, which can drive the second sealing member 52 to slide, completing the closing of the channel 3 and the positioning of the cleaning member 6.

[0066] In some possible embodiments, please refer to Figure 2 , Figure 3 and Figure 4 The movable seat 4 has a first guide groove 421 suitable for the sliding of the first sealing member 51 and a second guide groove 422 suitable for the sliding of the second sealing member 52. When the movable seat 4 is in the first working position, the first guide groove 421 is connected to the channel 3. When the movable seat 4 is in the second working position, the second guide groove 422 is connected to the channel 3.

[0067] When the movable seat 4 is in the first position, the axis of the first guide groove 421 coincides with the axis of the channel 3. When the first sealing member 51 slides within the first guide groove 421, the first guide groove 421 restricts the offset of the first sealing member 51, ensuring that the first sealing member 51 can be accurately inserted into the channel 3 to achieve a seal. When the movable seat 4 switches to the second position, the axis of the second guide groove 422 is aligned with the axis of the channel 3. Similarly, the second sealing member 52 slides under the guidance of the second guide groove 422, accurately entering the channel 3 to complete the seal.

[0068] In some possible embodiments, please refer to Figure 2 and Figure 4The channel 3 is configured as a tapered hole with a gradually decreasing cross section towards the inside of the barrel 21. The first sealing member 51 and the second sealing member 52 are both frustum structures adapted to the tapered hole, and the end facing the inside of the barrel 21 has an arc-shaped sealing surface adapted to the inner wall of the barrel 21.

[0069] When the first sealing member 51 or the second sealing member 52 moves toward the barrel 21, the first sealing member 51 or the second sealing member 52 gradually inserts into the conical channel 3. Due to the guiding effect of the conical surface, the first sealing member 51 or the second sealing member 52 automatically adjusts its position to achieve full contact between the conical surface and the inner wall of the channel 3. As the insertion depth increases, the contact pressure between the conical surfaces gradually increases, forming a self-tightening seal. When the first sealing member 51 or the second sealing member 52 is fully in place, the corresponding end arc-shaped sealing surface smoothly connects with the inner wall of the barrel 21, forming a transition surface without protrusions or gaps, preventing the melt from accumulating and carbonizing at the connection between the channel 3 and the barrel 21. The large contact area of ​​the conical surface effectively disperses the thermal stress caused by high temperature, preventing the sealing surface from failing due to thermal deformation. The seamless connection between the arc-shaped sealing surface and the inner wall of the material cylinder 21 prevents the material from accumulating at the sealing edge and carbonizing due to heat, reducing the need for additional cleaning. The guiding nature of the conical structure makes the insertion and removal of the first sealing member 51 or the second sealing member 52 smoother, avoiding component damage caused by misalignment of the sealing surface, while extending the service life of the sealing surface, further improving the reliability and stability of the device.

[0070] In summary, the screw cleaning structure provided by this invention, compared with the prior art, allows for several improvements. When the injection molding machine is running normally, the moving seat 4 is in the first position, and the first sealing member 51 faces the channel 3. At this time, the first sealing member 51 can be moved externally to close the channel 3, maintaining the sealing of the barrel 21 and normal production. When cleaning of the screw 22 is required, the moving seat 4 is driven to switch to the second position, so that the second sealing member 52 faces the channel 3. The second sealing member 52 is driven to move and close the channel 3, while the cleaning member 6 extends into the barrel 21 under elastic action and abuts against the surface of the screw 22. As the screw 22 rotates and moves axially, the cleaning member 6 continuously scrapes off the material adhering to its homogenization section, preventing these materials from carbonizing under long-term high-temperature conditions.

[0071] After cleaning, the movable seat 4 returns to the first station, and the first sealing member 51 re-closes the channel 3, allowing the injection molding machine to resume normal production. The screw cleaning structure of this invention eliminates the need to disassemble the screw 22, significantly improving equipment utilization and maintenance efficiency. Furthermore, the second sealing member 52 ensures reliable sealing during the cleaning process, preventing melt leakage or external contamination. This not only extends the service life of the screw 22 but also reduces the risk of material thermal degradation through regular cleaning, improving the quality and consistency of plastic products and meeting the high standards required for injection molding.

[0072] Embodiments of the present invention also provide an injection molding machine that employs the above-described screw cleaning structure, thereby not only extending the service life of the screw 22, but also reducing the risk of thermal degradation of materials through regular cleaning, improving the quality and consistency of plastic products, and meeting the high standards required for injection molding processes.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A screw cleaning structure, characterized in that, include: The base (1) is fixedly mounted on the barrel (21) and has a channel (3) that communicates with the internal space of the barrel (21); The movable seat (4) is slidably disposed on the base (1) and has a first working position and a second working position; The sealing structure includes a first sealing member (51) and a second sealing member (52); both the first sealing member (51) and the second sealing member (52) are slidably disposed on the movable seat (4) and each has the freedom to move toward and away from the material cylinder (21); and The cleaning component (6) is disposed on the second closing component (52) and has an elastic degree of freedom to move toward the material cylinder (21); When the movable seat (4) is in the first working position, the first sealing member (51) faces the channel (3) so that the first sealing member (51) can be driven to move to close the channel (3); when the movable seat (4) is in the second working position, the second sealing member (52) faces the channel (3) so that the second sealing member (52) can be driven to move to close the channel (3), and the cleaning member (6) abuts against the screw (22) inside the barrel (21); The cleaning component (6) includes: The mounting slider (61) is slidably disposed on the second closure member (52) along the radial direction of the material cylinder (21); A cleaning scraper (62) is detachably mounted on the mounting slider (61); A spring (63) is connected at both ends to the mounting slider (61) and the second closure (52) respectively, for providing an elastic force for the cleaning scraper (62) to move toward the screw (22); the cleaning scraper (62) is coplanar with the screw (22), and one end of the cleaning scraper (62) toward the screw (22) is tapered; The sliding direction of the mounting slider (61) is defined as the first direction, and the direction perpendicular to the first direction is defined as the second direction; The cleaning scraper (62) is provided with multiple sets of through holes (621) distributed along the first direction, and the number of the through holes (621) increases in a progressively larger number along the direction away from the screw (22). The maximum dimension of each of the through holes (621) in the second direction is smaller than the thread width of the screw (22); The two adjacent through holes (621) in the first direction are staggered, and their projections in the second direction overlap.

2. The screw cleaning structure as described in claim 1, characterized in that, The mounting slider (61) has a groove (611) and the cleaning scraper (62) is inserted into the groove (611) by an interference fit.

3. The screw cleaning structure as described in claim 1, characterized in that, The base (1) is provided with a slide rail (11), and the movable seat (4) is slidably connected to the slide rail (11); A first hydraulic cylinder (71) is fixedly installed on the base (1). The telescopic end of the first hydraulic cylinder (71) is connected to the movable seat (4) to drive the movable seat (4) to switch between the first work station and the second work station.

4. The screw cleaning structure as described in claim 1, characterized in that, A second hydraulic cylinder (72) is fixedly installed on the base (1) below the movable seat (4). The piston rod of the second hydraulic cylinder (72) faces the channel (3), and a connecting block (721) is fixedly installed on the piston rod. The movable seat (4) is provided with an elongated relief hole (41), the piston rod passes through the relief hole (41), and the piston rod moves relative to the relief hole (41) when the movable seat (4) moves. The first sealing member (51) is provided with a first connecting groove (511). When the moving seat (4) is in the first working position, the connecting block (721) engages with the first connecting groove (511) so that the piston rod can drive the first sealing member (51) to move. The second sealing member (52) is provided with a second connecting groove (521). When the moving seat (4) is in the second working position, the connecting block (721) engages with the second connecting groove (521) so that the piston rod can drive the second sealing member (52) to move.

5. The screw cleaning structure as described in claim 1, characterized in that, The movable seat (4) is provided with a first guide groove (421) suitable for sliding of the first sealing member (51) and a second guide groove (422) suitable for sliding of the second sealing member (52); When the movable seat (4) is in the first working position, the first guide groove (421) is connected to the channel (3); When the movable seat (4) is in the second working position, the second guide groove (422) is connected to the channel (3).

6. The screw cleaning structure as described in claim 1, characterized in that, The channel (3) is configured as a tapered hole with a cross section that gradually decreases toward the inside of the barrel (21). The first sealing member (51) and the second sealing member (52) are both frustum structures adapted to the tapered hole, and the end facing the inside of the barrel (21) has an arc-shaped sealing surface adapted to the inner wall of the barrel (21).

7. An injection molding machine, characterized in that, Includes the screw cleaning structure as described in any one of claims 1 to 6.

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