Extruder with corrosion-resistant sealing structure

Abstract

The invention relates to an extruder with a corrosion-resistant sealing structure, and relates to the field of extruders, the extruder comprises a transmission mechanism and an extrusion mechanism, the transmission mechanism and the extrusion mechanism are connected through a connecting channel, a transmission sealing ring and a sealing ring plate are arranged in the transmission mechanism and the extrusion mechanism, and an elastic ring is combined to realize multiple dynamic sealing; in addition, a clamping plate which is subjected to mirror surface treatment and provided with a sealing gasket is additionally arranged between the transmission shell and the extrusion shell so as to enhance the static sealing performance. The sealing design is optimized, and the negative pressure source and the adjusting device are introduced, so that the corrosion resistance and the sealing reliability of equipment are remarkably improved, the leakage risk and the maintenance cost are effectively reduced, and meanwhile, the service life of the extruder is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of equipment sealing structures, and in particular, to an extruder with a corrosion-resistant sealing structure. Background Art

[0002] As a key piece of equipment, the extruder plays an important role in fields such as plastics, rubber, and polymer processing. It applies pressure to slurry materials or highly viscous fluids through mechanical movement, causing them to pass through a specific forming device and ultimately form continuous profiles with a constant cross-sectional shape. With the continuous development of industrial production, the design and manufacturing technologies of extruders have also been continuously improving, especially achieving remarkable results in improving production efficiency and ensuring product quality. The core functions of this equipment cover multiple aspects such as material plasticization, mixing, pressurization, and continuous extrusion, and its performance directly affects the quality and cost of downstream products.

[0003] The extruders in the related technologies usually include at least two parts, namely a transmission part and an extrusion part, and the connection between the transmission part and the extrusion part is set to be detachable for easy maintenance or repair of a certain part. The transmission part includes a transmission housing, and a motor and a transmission shaft are arranged inside the transmission housing. The extrusion part includes an extrusion housing, and a screw is arranged inside the extrusion housing. Connection channels are provided at the connection parts of the transmission housing and the extrusion housing. In order to protect components such as the motor inside the transmission housing, sealing rings that fill the gap between the transmission shaft and the connection channel are usually provided at the connection channels to limit the entry of materials into the inside of the transmission housing.

[0004] The above-mentioned related technologies have the following defects: In a corrosive material environment, due to the fixed annular structure and relatively thick material of the traditional sealing ring, it is easily eroded and loses its tight fit, resulting in sealing failure. Specifically, when a local area is corroded, the sealing ring can no longer effectively press the transmission shaft continuously, thus seriously affecting the stability and reliability of the entire system, so it needs to be improved. Summary of the Invention

[0005] In order to improve the service life of the traditional sealing structure in a material environment with strong corrosion, this application provides an extruder with a corrosion-resistant sealing structure.

[0006] The extruder with a corrosion-resistant sealing structure provided by this application adopts the following technical solutions: An extruder with a corrosion-resistant sealing structure includes a connected transmission mechanism and an extrusion mechanism. The transmission mechanism includes a transmission housing, and a motor and a transmission shaft are arranged inside the transmission housing. The extrusion mechanism includes an extrusion housing, and a screw is arranged inside the extrusion housing. A connection channel is arranged at the connection between the transmission housing and the extrusion housing. The screw and the transmission shaft are connected at the connection channel. A transmission sealing ring is arranged inside the connection channel. The outer edge of the transmission sealing ring abuts against the inner wall of the connection channel. The inner edge of the transmission sealing ring is in clearance fit with the transmission shaft. A sealing ring plate is connected to the inner edge of the transmission sealing ring. The inner side of the sealing ring plate abuts against the transmission shaft, and an elastic ring is press-fitted on the outer side of the sealing ring plate.

[0007] By adopting the above technical solution, the transmission sealing ring, the sealing ring plate and the elastic ring work together to significantly improve the service life of the sealing structure in a material environment with strong corrosion. Specifically, the elastic ring can automatically maintain the tight fit state between the sealing ring plate and the transmission shaft. Even if the thickness of the sealing ring plate decreases due to corrosion, the elastic ring can still automatically tighten to ensure continuous good sealing performance. This design not only delays the time of seal failure but also greatly reduces the need for frequent replacement of the sealing components, thereby improving the overall operation efficiency and reliability of the equipment.

[0008] Preferably, a clamping plate is arranged between the transmission housing and the extrusion housing. The clamping plate is detachably connected to both the transmission housing and the extrusion housing. The two side walls of the clamping plate and the opposite end faces of the transmission housing and the extrusion housing are all processed by mirror grinding. Sealing gaskets are arranged on both side walls of the clamping plate. The two sealing gaskets respectively abut against the end faces of the transmission housing and the extrusion housing.

[0009] By adopting the above technical solution, the arrangement of the clamping plate realizes the detachable connection between the transmission housing and the extrusion housing, which is convenient for the overhaul and maintenance of the equipment. The two side walls of the clamping plate and the opposite end faces of the transmission housing and the extrusion housing are processed by mirror grinding, significantly reducing the surface roughness, improving the sealing performance and reducing the possibility of material residue. At the same time, the addition of the sealing gaskets further enhances the sealing effect at the interface, effectively preventing the intrusion of external impurities and the leakage of internal materials, and improving the overall reliability of the equipment.

[0010] Preferably, the extrusion mechanism is connected to a negative pressure source, and the sealing ring plate is inclined towards the side away from the extrusion mechanism.

[0011] By adopting the above technical solution, the inclined setting of the sealing ring plate can cooperate with the action of the negative pressure source to enhance the sealing performance. Specifically, during the material extrusion process, the exhaust gas generated can be timely sucked out by the negative pressure source, and at the same time, the negative pressure source can maintain the negative pressure state inside the extrusion mechanism. This negative pressure state will attract the sealing ring plate towards the extrusion mechanism, prompting the sealing ring plate to fit more closely to the transmission shaft, thereby effectively improving the sealing performance of this part and reducing the leakage risk caused by corrosion.

[0012] Preferably, the sealing ring plate has an abutting section, the abutting section is located at one end of the sealing ring plate close to the transmission sealing ring, the thickness of the abutting section increases in the direction away from the extrusion housing, and the elastic ring is located outside the abutting section.

[0013] By adopting the above technical solution, the design of the abutting section of the sealing ring plate enables its thickness to gradually increase in the direction away from the extrusion housing, which can effectively prevent the elastic ring from falling off during installation and enhance the overall structural stability. At the same time, in a negative pressure environment, even if the abutting section is bent and deformed due to force, the thicker part can squeeze the position between the elastic ring and the transmission shaft, thereby further improving the sealing performance here. This structure not only ensures a tight fit in the initial state but also can adapt to different working conditions changes to ensure a long-term reliable sealing effect.

[0014] Preferably, an adjusting ring is threadedly connected to the inner edge of the transmission sealing ring, and the adjusting ring is located on the side of the elastic ring facing the extrusion housing and abuts against the elastic ring.

[0015] By adopting the above technical solution, adding an adjusting ring with a threaded connection to the inner edge of the transmission sealing ring, and making the adjusting ring located on the side of the elastic ring facing the extrusion housing and abutting against the elastic ring can effectively address the problem of the sealing performance decline caused by the fatigue of the elastic ring or the wear and corrosion of the sealing ring plate. Specifically, when the elasticity of the elastic ring decreases or the sealing ring plate is damaged, the position of the adjusting ring can be adjusted to push the elastic ring towards the area of the abutting section with a larger thickness, thereby re-establishing and maintaining the close contact between the sealing ring plate and the transmission shaft to ensure a good sealing effect. At the same time, the setting of the adjusting ring can gradually guide the elastic ring to move to a fresh part that has not contacted the material, delaying the aging process of the overall component and significantly extending the effective service life and replacement cycle of the sealing structure.

[0016] Preferably, the transmission housing is provided with an operation cavity, an operation rod is rotatably arranged inside the operation cavity, a ratchet is rotatably arranged at the bottom of the operation rod, ratchet teeth are circumferentially arranged on the adjusting ring, the transmission sealing ring is provided with a relief hole communicated with the operation cavity, and the bottom of the ratchet extends into the relief hole and abuts against the ratchet teeth.

[0017] By adopting the above technical solution, the operation cavity provides an installation space for the operating rod, enabling the operating rod to control the adjusting ring outside the transmission housing. The ratchet pawl at the bottom of the operating rod cooperates with the ratchet teeth on the adjusting ring, enabling the one-way rotation of the adjusting ring, thereby accurately adjusting the position of the elastic ring when needed. This design can complete the adjustment without shutting down or disassembling the equipment, significantly improving the convenience and efficiency of maintenance. At the same time, the design of the relief hole ensures that the ratchet pawl can accurately extend into and engage with the ratchet teeth, ensuring the reliability of the adjustment process. In summary, this solution effectively improves the adjustability and practicability of the extrusion machine sealing structure and extends the overall service life.

[0018] Preferably, a rotating shaft is arranged inside the operation cavity, the operating rod is provided with an oblong hole, the rotating shaft is located inside the oblong hole and can slide and rotate relatively, and a downward pushing elastic member for pushing the operating rod towards the ratchet teeth is further arranged between the bottom of the inner wall of the oblong hole and the rotating shaft.

[0019] By adopting the above technical solution, the operating rod can swing flexibly around the rotating shaft and always has a tendency to push towards the ratchet teeth under the action of the downward pushing elastic member. This design ensures the effective engagement between the ratchet pawl and the ratchet teeth, thereby realizing the precise adjustment of the adjusting ring. At the same time, the design of the oblong hole allows the operating rod to move within a certain range, improving the flexibility and reliability of the operation. Finally, this structure optimizes the adjustment process of the sealing component, and the sealing performance can be maintained without shutting down or disassembling the machine, significantly improving the operating efficiency and service life of the equipment.

[0020] Preferably, a pressing button spring for pushing the ratchet pawl towards the ratchet teeth is arranged between the operating rod and the ratchet pawl, and the operating rod is provided with a limiting post for supporting the bottom of the ratchet pawl.

[0021] By adopting the above technical solution, the pressing button spring can improve the reset efficiency of the ratchet pawl, ensure the stable engagement between the ratchet pawl and the ratchet teeth, and enhance the operation reliability during the adjustment of the adjusting ring. At the same time, the limiting post and the pressing button spring work together to enable the ratchet pawl to have a fixed lower limit of the rotation angle, preventing the angle of the ratchet pawl from getting out of control due to the upward movement of the operating rod, thereby improving the stability and safety of the entire adjustment mechanism.

[0022] The pressing button spring itself can make the reset efficiency of the ratchet pawl higher, and the combined action of the pressing button spring and the limiting post can make the ratchet pawl have a fixed lower limit of the rotation angle, avoiding the angle of the ratchet pawl from getting out of control after the operating rod is lifted.

[0023] By adopting the above technical solution, the pressing button spring can improve the efficiency of the pawl reset, ensuring that the pawl quickly returns to the initial position to maintain normal transmission function. At the same time, the pressing button spring and the limiting post cooperate to limit the minimum rotation angle of the pawl, preventing the angle of the pawl from getting out of control due to the loss of restraint after the operating rod is lifted, thus ensuring the stability and reliability of the entire adjustment mechanism.

[0024] Preferably, a pressing end cover is arranged inside the transmission housing. The pressing end cover is provided with a reserved hole for the transmission shaft to pass through, and the transmission sealing ring abuts between the clamping plate and the pressing end cover.

[0025] By adopting the above technical solution, the setting of the pressing end cover can effectively enhance the installation stability of the transmission sealing ring inside the transmission housing. Specifically, in the limiting structure formed between the clamping plate and the pressing end cover, the pressure on the transmission sealing ring from both ends is evenly distributed, thus avoiding problems such as position deviation or loosening caused by unilateral force. This design not only helps to improve the sealing performance but also simplifies the disassembly and assembly operations during subsequent maintenance, ensuring the reliability during the long-term operation of the extruder.

[0026] Preferably, a dust-proof plug is arranged in the reserved hole. The dust-proof plug is provided with an assembly hole for the transmission shaft to pass through. An anti-detachment ring strip is arranged on the outer wall of the dust-proof plug, and an anti-detachment ring groove for inserting the anti-detachment ring strip is arranged on the inner wall of the reserved hole.

[0027] By adopting the above technical solution, the dust-proof plug can effectively prevent external dust and impurities from entering the transmission housing, protecting the internal precision components from contamination. The matching design of the anti-detachment ring strip and the anti-detachment ring groove ensures the stable installation of the dust-proof plug in the reserved hole, preventing the dust-proof plug from loosening or falling off due to vibration or other external factors, thus improving the reliability of the overall structure. This design is particularly suitable for extruders in harsh working environments, significantly enhancing the durability and sealing performance of the equipment.

[0028] In summary, the present application includes at least one of the following beneficial technical effects: 1. The elastic ring can automatically maintain the pressing state between the sealing ring plate and the transmission shaft. Even when the sealing ring plate becomes thinner due to corrosion, good sealing performance can be maintained through elastic tightening, thus significantly extending the service life of the sealing structure in a corrosive material environment; 2. The application of the negative pressure source not only helps to timely exhaust the waste gas during the extrusion process but also can further enhance the fit between the sealing ring plate and the transmission shaft by applying an additional attraction force to the sealing ring plate, strengthening the sealing performance; 3. The design of the abutting section combined with the action of the elastic ring can, when the sealing ring plate deforms, use the gradually thickened part to squeeze the position between the elastic ring and the transmission shaft, thus further improving the overall sealing effect under negative pressure. Brief Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present application; Figure 2 It is a schematic structural diagram for embodying the connection relationship between the splint, the transmission housing and the extrusion housing in Embodiment 1 of the present application; Figure 3 It is a schematic structural diagram for embodying the connection relationship between the transmission sealing ring and the connection channel in Embodiment 1 of the present application; Figure 4 It is Schematic Diagram State 1 of the connection relationship between the elastic ring and the sealing ring plate in Embodiment 1 of the present application; Figure 5 It is Schematic Diagram State 2 of the connection relationship between the elastic ring and the sealing ring plate in Embodiment 1 of the present application; Figure 6 It is a schematic structural diagram for embodying the connection relationship between the operating rod and the adjusting ring in Embodiment 2 of the present application; Figure 7 It is a schematic structural diagram for embodying the connection relationship between the ratchet pawl and the operating rod in Embodiment 2 of the present application; Figure 8 It is a schematic structural diagram for embodying the connection relationship between the operating rod and the rotating shaft in Embodiment 2 of the present application.

[0030] In the figure: 1. Transmission mechanism; 10. Connection channel; 11. Transmission housing; 110. Operation cavity; 12. Motor; 13. Transmission shaft; 2. Extrusion mechanism; 21. Extrusion housing; 22. Screw; 23. Splint; 24. Sealing gasket; 3. Transmission sealing ring; 30. Relief hole; 31. Sealing ring plate; 32. Elastic ring; 4. Tightening end cover; 40. Reserved hole; 41. Dust plug; 42. Assembly hole; 43. Anti-detachment ring strip; 44. Anti-detachment ring groove; 5. Adjusting ring; 51. Ratchet teeth; 6. Operating rod; 60. Waist-shaped hole; 61. Rotating shaft; 62. Lower pushing elastic member; 63. Ratchet pawl; 64. Tightening button spring; 65. Limit post. Detailed Description of the Invention

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative labor, and these embodiments are also within the protection scope of the present invention.

[0032] The inventors of the present application have found that, as a key device, an extruder needs to solve the problem that traditional sealing rings are vulnerable to corrosion, resulting in sealing failure. Therefore, the present application adopts a design of a new anti-corrosion sealing structure, achieving the effect of significantly improving the sealing performance. The following is a further detailed description of the present application.

[0033] Embodiment 1 Referring to Figure 1 and Figure 2 Embodiment 1 of the present application provides an extruder with an anti-corrosion sealing structure, which includes a connected transmission mechanism 1 and an extrusion mechanism 2. The transmission mechanism 1 includes a transmission housing 11, in which a motor 12 and a transmission shaft 13 are arranged; the extrusion mechanism 2 includes an extrusion housing 21, in which a screw 22 is arranged. The transmission housing 11 and the extrusion housing 21 are connected through a connection channel 10, and the screw 22 passes through the connection channel 10 and is connected to the transmission shaft 13. In addition, a clamping plate 23 is arranged between the transmission housing 11 and the extrusion housing 21, and both ends of the clamping plate 23 are firmly connected to the transmission housing 11 and the extrusion housing 21 respectively through high-strength bolts. The two side walls of the clamping plate 23 and the opposite end faces of the transmission housing 11 and the extrusion housing 21 are all processed by precision mirror grinding to ensure that the flatness meets the required standards. Sealing gaskets 24 are inlaid on the two side walls of the clamping plate 23. The sealing gaskets 24 are made of EPDM rubber (ethylene propylene diene monomer rubber) and are pressed against the end faces of the transmission housing 11 and the extrusion housing 21 respectively to form a double-sealing barrier. By introducing the structure of the clamping plate 23, the rigidity and sealing performance of the connection part are strengthened, and at the same time, the problem of local stress concentration caused by uneven single-point load distribution is reduced, fundamentally improving the stability of the overall system. In addition, a through hole is opened in the center of the clamping plate 23 as a part of the connection channel 10, and the entire transmission housing 11, extrusion housing 21, connection channel 10, transmission shaft 13, and screw 22 are all coated with a hard coating, such as a tungsten carbide coating, by electroplating or spraying to significantly improve the anti-wear and anti-corrosion performance.

[0034] During the actual production process, a negative pressure source is also connected to the side wall of the extrusion mechanism 2. For example, in the field of biodegradable material processing, when extruding a PLA / PBAT blend, waste gas will continuously be generated in this production environment. Therefore, it is necessary to use the negative pressure source to timely suck out the waste gas to ensure a stable negative pressure state inside the extrusion mechanism 2.

[0035] Referring to Figure 3, a drive sealing ring 3 is arranged in the connecting channel 10 to seal the gap between the transmission shaft 13 and the connecting channel 10. In this embodiment, two drive sealing rings 3 are arranged. During the actual processing, a drive sealing ring 3 made of a specific material can be flexibly selected according to the characteristics of the material, or two drive sealing rings 3 made of different materials can be used for joint sealing. An abutting end cover 4 is arranged inside the drive housing 11 close to the connecting channel 10. The end of the abutting end cover 4 extends into the connecting channel 10 and abuts against the drive sealing ring 3. In the limiting structure formed between the clamping plate 23 and the abutting end cover 4, the pressure on the drive sealing ring 3 from both ends is evenly distributed, thus avoiding the problems of position deviation or loosening caused by unilateral force. This design not only helps to improve the sealing performance, but also simplifies the disassembly and assembly operations during subsequent maintenance, ensuring the reliability during the long-term operation of the extruder.

[0036] Refer to Figure 3 , the abutting end cover 4 is provided with a reserved hole 40 for the transmission shaft 13 to pass through. A dust-proof plug 41 is arranged in the reserved hole 40. The dust-proof plug 41 is provided with an assembly hole 42 for the transmission shaft 13 to pass through. An anti-disengagement ring strip 43 is arranged on the outer wall of the dust-proof plug 41, and an anti-disengagement ring groove 44 for the anti-disengagement ring strip 43 to be inserted is arranged on the inner wall of the reserved hole 40. The dust-proof plug 41 can effectively prevent external dust and impurities from entering the drive housing 11 and protect the internal precision components from being polluted. The matching design of the anti-disengagement ring strip 43 and the anti-disengagement ring groove 44 ensures the stable installation of the dust-proof plug 41 in the reserved hole 40, preventing the dust-proof plug 41 from loosening or falling off due to vibration or other external factors, thereby improving the reliability of the overall structure.

[0037] Refer to Figure 3 , the outer edge of the drive sealing ring 3 is closely attached to the inner wall of the connecting channel 10, but the inner edge has a clearance fit with the transmission shaft 13. A sealing ring plate 31 is connected to the inner edge of the drive sealing ring 3. An elastic ring 32 is sleeved on the outside of the sealing ring plate 31 with an interference fit. The sealing ring plate 31 is inclined and abuts against the transmission shaft 13 on the inner side. During the service of the drive sealing ring 3, the sealing ring plate 31 and the elastic ring 32, the elastic ring 32 can automatically maintain the abutting state between the sealing ring plate 31 and the transmission shaft 13. Although the material is corrosive and will corrode the sealing ring plate 31, for example, the thickness of the sealing ring plate 31 becomes thinner after being corroded, the elastic ring 32 located outside the sealing ring plate 31 can automatically tighten and continue to maintain the abutting state between the sealing ring plate 31 and the transmission shaft 13, so as to realize that the sealing structure at this place can serve for a longer time in a material environment with strong corrosion, lengthen the replacement cycle of the sealing structure, and effectively improve the overall production and processing efficiency.

[0038] In addition, refer to Figure 4 and Figure 5The sealing ring plate 31 is designed to be a wedge-shaped structure with a certain inclination angle, and its inclination direction is away from the extrusion mechanism 2, so as to maintain the ideal contact pressure between the sealing ring plate 31 and the transmission shaft 13 with the help of the attraction generated by the external negative pressure source. The negative pressure state also attracts the sealing ring plate 31 to a certain extent in the direction of the extrusion mechanism 2, thereby automatically promoting the sealing ring plate 31 to abut against the transmission shaft 13, and assisting in maintaining the sealing there. On the other hand, a special abutment section is provided at one end of the sealing ring plate 31 close to the transmission sealing ring 3, and the thickness of the abutment section increases in the direction away from the extrusion housing 21, presenting a trapezoidal step-like feature. The elastic ring 32 is located just outside the abutment section. This arrangement helps to prevent the elastic ring 32 from slipping on the one hand, and enhances the ability to resist negative pressure deformation on the other hand. After the elastic ring 32 is set on the abutting section, the abutting section becomes thinner as it approaches the extrusion housing 21. Therefore, when the abutting section is fitted with the transmission shaft 13, the outer edge of the entire abutting section is conical, and the tip faces the extrusion housing 21. In this state, the elastic ring 32 is not easy to separate from the abutting section and the sealing ring plate 31, which improves the stability of the elastic ring 32 after installation. In addition, in conjunction with the negative pressure inside the extrusion housing 21, the abutting section can have a tendency to bend toward the extrusion housing 21 after bending and deformation, and due to the gradual thickness of the abutting section, the abutting section of the elastic ring 32 away from the extrusion housing 21 is gradually thickened. Therefore, when the abutting section has a tendency to deform toward the extrusion housing 21, the thicker portion of the sealing ring plate 31 will squeeze the position between the elastic ring 32 and the transmission shaft 13, thereby further improving the sealing performance under negative pressure. The method of comprehensively utilizing the advantages of geometric shapes fully guarantees the functional integrity of the sealing link, and can show excellent performance even under harsh working conditions.

[0039] The implementation principle of this embodiment is: when the sealing ring plate 31 is gradually thinned due to corrosion by the material, the elastic ring 32 will automatically shrink to compensate, so that the sealing ring plate 31 always maintains good contact with the transmission shaft 13, thereby effectively preventing material leakage. The adaptive characteristics of the elastic ring 32 make up for the shortcomings of the traditional static sealing ring, which not only improves the reliability of the system, but also prolongs the overall service life of the sealing component.

[0040] Example 2 Reference Figure 6, the difference between this embodiment and Embodiment 1 is that, in order to cope with emergencies under extreme working conditions, an adjusting ring 5 is also threadedly connected to the inner edge of the transmission sealing ring 3. The adjusting ring 5 is placed on the side of the elastic ring 32 facing the extrusion housing 21 and is kept in a tightly abutted state with it. During service, the elastic ring 32 may undergo fatigue, resulting in reduced elasticity, and the sealing ring plate 31 may also be worn or corroded during use. Therefore, when such a situation occurs, the adjusting ring 5 can be rotated to push the elastic ring 32 towards the side away from the extrusion housing 21, causing the elastic ring 32 to shift to the thicker abutting section, so as to maintain the required pressure at the abutting position between the sealing ring plate 31 and the transmission shaft 13, and further maintain the sealing degree. In addition, when the actual contact position between the elastic ring 32 and the abutting section shifts towards the side away from the extrusion housing 21, the newly exposed part in the material is the part that has not actually contacted the material before. Therefore, the overall sealing degree is better. In this way, the sealing ring plate 31 can be abutted against the transmission shaft 13 in sequence, and contact the material in sequence, so as to maintain the sealing performance during the overall service life and extend the overall service life or replacement cycle. Therefore, in the actual use scenario, if it is found that the elastic ring 32 is fatigued and loose or the sealing ring plate 31 is severely worn after long-term operation, the elastic ring 32 can be pushed forward to the thicker abutting section area by rotating the adjusting ring 5 to re-establish the necessary sealing pressure.

[0041] Refer to Figure 6 , an operation cavity 110 is also penetrated through the top of the transmission housing 11. The operation cavity 110 is a narrow and long channel, and an operating rod 6 is inserted inside the operation cavity 110. A ratchet 63 is rotatably arranged at the bottom of the operating rod 6. The adjusting ring 5 is stepped in the circumferential direction, and the higher section is the threaded connection section with the transmission sealing ring 3, and the lower section is provided with ratchet teeth 51. The height of the ratchet teeth 51 is such that it does not affect the threaded adjustment of the adjusting ring 5. A relief hole 30 communicating with the operation cavity 110 is provided at the top of the transmission sealing ring 3. When the operating rod 6 descends to the bottom, the bottom of the ratchet 63 correspondingly extends into the relief hole 30 and abuts against the ratchet teeth 51. When it is necessary to rotate the adjusting ring 5, the ratchet 63 can be intermittently pushed against the ratchet teeth 51 by reciprocally swinging the operating rod 6, and then the adjustment operation of the adjusting ring 5 can be realized on the outside of the transmission housing 11 without stopping the machine or disassembling the machine, with higher convenience. In addition, the operating rod 6 can also be lifted to temporarily withdraw the ratchet 63 from the relief hole 30, which is convenient for replacing or maintaining the transmission sealing ring 3.

[0042] Refer to Figure 7A torsion spring 64 is provided between the operating rod 6 and the pawl 63 to push the pawl 63 toward the ratchet 51, and a limiting column 65 is provided on the operating rod 6 to support the bottom of the pawl 63. The torsion spring 64 itself can make the pawl 63 more efficient in resetting, and the combined effect of the torsion spring 64 and the limiting column 65 can make the pawl 63 have a fixed lower limit of the rotation angle, so as to prevent the angle of the pawl 63 from being uncontrolled after the operating rod 6 is lifted.

[0043] Reference Figure 8 , a rotating shaft 61 is rotatably arranged inside the operating cavity 110, and correspondingly, the operating rod 6 is provided with a waist-shaped hole 60. After installation, the rotating shaft 61 is located inside the waist-shaped hole 60, thereby achieving a high degree of freedom for the operating rod 6, which can slide up and down slightly and swing slightly. In addition, a push-down elastic member 62 for pushing the operating rod 6 downward is also arranged between the bottom of the inner wall of the waist-shaped hole 60 and the rotating shaft 61. The push-down elastic member 62 is a spring. Through this structure, the operating rod 6 can have a tendency to move downward.

[0044] The implementation principle of this embodiment is: the operating rod 6 can realize the regulation of the adjustment ring 5 outside the transmission housing 11. The pawl 63 at the bottom of the operating rod 6 cooperates with the ratchet 51 on the adjustment ring 5, which can realize the unidirectional rotation of the adjustment ring 5, so as to accurately adjust the position of the elastic ring 32 when needed. This design can complete the adjustment without stopping or disassembling the equipment, which significantly improves the convenience and efficiency of maintenance. At the same time, the design of the clearance hole 30 ensures that the pawl 63 can accurately extend and engage with the ratchet 51, ensuring the reliability of the adjustment process. In summary, this solution effectively improves the adjustability and practicality of the extruder sealing structure and extends the overall service life.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An extruder with a corrosion-resistant sealing structure, comprising a connected drive mechanism (1) and an extrusion mechanism (2). The drive mechanism (1) includes a drive housing (11), and a motor (12) and a drive shaft (13) are arranged inside the drive housing (11). The extrusion mechanism (2) includes an extrusion housing (21), and a screw (22) is arranged inside the extrusion housing (21). A connection channel (10) is arranged at the connection between the drive housing (11) and the extrusion housing (21). The screw (22) is connected to the drive shaft (13) at the connection channel (10). It is characterized in that: A transmission sealing ring (3) is arranged inside the connecting channel (10), the outer edge of the transmission sealing ring (3) abuts against the inner wall of the connecting channel (10), the inner edge of the transmission sealing ring (3) is clearance-matched with the transmission shaft (13), the inner edge of the transmission sealing ring (3) is connected to a sealing ring plate (31), the inner side of the sealing ring plate (31) abuts against the transmission shaft (13), and an elastic ring (32) is arranged on the outer interference sleeve.

2. The extruder with a corrosion-resistant sealing structure according to claim 1, characterized in that: A clamping plate (23) is arranged between the transmission housing (11) and the extrusion housing (21); the clamping plate (23) is detachably connected to the transmission housing (11) and the extrusion housing (21); both side walls of the clamping plate (23) and the end faces of the transmission housing (11) and the extrusion housing (21) facing each other are mirror-polished; both side walls of the clamping plate (23) are provided with sealing gaskets (24); the two sealing gaskets (24) are respectively abutted against the end faces of the transmission housing (11) and the extrusion housing (21).

3. The extruder with a corrosion-resistant sealing structure according to claim 1, characterized in that: The extrusion mechanism (2) is connected to a negative pressure source, and the sealing ring plate (31) is arranged to be inclined toward a side away from the extrusion mechanism (2).

4. The extruder with a corrosion-resistant sealing structure according to claim 3, wherein: The sealing ring plate (31) has an abutment section, which is located at one end of the sealing ring plate (31) close to the transmission sealing ring (3), and the thickness of the abutment section increases in a direction away from the extrusion shell (21), and the elastic ring (32) is located outside the abutment section.

5. An extruder with a corrosion-resistant sealing structure according to claim 4, characterized in that: The inner edge of the transmission sealing ring (3) is threadedly connected with an adjusting ring (5), and the adjusting ring (5) is located on the side of the elastic ring (32) facing the extrusion housing (21) and abuts against the elastic ring (32).

6. An extruder with a corrosion-resistant sealing structure according to claim 5, characterized in that: The transmission housing (11) is provided with an operating chamber (110), an operating rod (6) is rotatably provided inside the operating chamber (110), a ratchet (63) is rotatably provided at the bottom of the operating rod (6), the adjustment ring (5) is circumferentially provided with ratchet teeth (51), the transmission sealing ring (3) is provided with a clearance hole (30) connected to the operating chamber (110), and the bottom of the ratchet (63) extends into the clearance hole (30) and abuts against the ratchet teeth (51).

7. An extruder with a corrosion-resistant sealing structure according to claim 6, characterized in that: The operating cavity (110) is provided with a rotating shaft (61), the operating rod (6) is provided with a waist-shaped hole (60), the rotating shaft (61) is located inside the waist-shaped hole (60) and can slide and rotate relatively, and a push-down elastic member (62) for pushing the operating rod (6) toward the ratchet (51) is also provided between the bottom of the inner wall of the waist-shaped hole (60) and the rotating shaft (61).

8. An extruder with a corrosion-resistant sealing structure according to claim 7, characterized in that: A torsion spring (64) for pushing the pawl (63) toward the ratchet (51) is provided between the operating rod (6) and the pawl (63), and the operating rod (6) is provided with a limiting column (65) for supporting the bottom of the pawl (63).

9. The extruder with a corrosion-resistant sealing structure according to claim 2, wherein: The transmission housing (11) is provided with a tight end cover (4) inside, the tight end cover (4) is provided with a reserved hole (40) for the transmission shaft (13) to pass through, and the transmission sealing ring (3) is abutted between the clamping plate (23) and the tight end cover (4).

10. An extruder with a corrosion-resistant sealing structure according to claim 9, characterized in that: A dust-proof plug (41) is arranged in the reserved hole (40). The dust-proof plug (41) is provided with an assembly hole (42) for a transmission shaft (13) to pass through. An anti-disengagement ring strip (43) is arranged on the outer wall of the dust-proof plug (41), and an anti-disengagement ring groove (44) for inserting the anti-disengagement ring strip (43) is arranged on the inner wall of the reserved hole (40).

Images