Splicing type composite barrel of screw extruder

Abstract

The invention relates to the technical field of extrusion molding equipment, and discloses a spliced composite barrel of a screw extruder, which comprises a barrel section for conveying materials in sections, one end of the barrel section is fixedly connected with a flange end I, the other end of the barrel section is fixedly connected with a flange end II, and the adjacent flange end I and flange end II are clamped with each other. A guide ring is arranged in the middle of the end, close to the first flange end, of the second flange end. The first flange end and the second flange end are arranged, the automatic centering function during splicing is achieved through the inclined attaching design of the guide ring and the guide groove, tiny deviation can be actively compensated in the assembling process, it is guaranteed that the axes of all the barrel sections coincide from the axial dimension and the radial dimension through the cooperation of radial clamping of the convex groove and the clamping groove, and the assembling efficiency is improved. The problem of coaxiality deviation caused by traditional single bolt positioning is solved, circumferential rotation is further limited through an arc-shaped meshing structure of the first check block and the second check block, and a continuous and accurate inner channel is formed by the spliced inner barrel piece.

Description

Technical Field

[0001] This invention relates to the field of extrusion molding equipment technology, specifically to a spliced ​​composite cylinder for a screw extruder. Background Technology

[0002] As a core piece of equipment in rubber and plastics processing, composite material molding, and other fields, screw extruders use the rotation of the screw to propel materials within the barrel. Utilizing external barrel heating and the heat generated by the screw's shearing and compression, the materials are melted, mixed, degassed, and homogenized, ultimately being extruded through the die. The barrel, as one of the core components of the screw extruder, is a crucial space for material plasticization and conveying; its performance directly affects the extruder's plasticization quality, production efficiency, and operational stability. Modular composite barrels, with their functional zoning and on-demand material selection features, have been successfully applied to high-end customized production and multi-condition composite demand scenarios.

[0003] In actual production, spliced ​​composite cylinders commonly suffer from excessive coaxiality and roundness errors after multi-segment splicing. The core reason is that existing splicing structures rely heavily on flange bolts for positioning, lacking precise positioning pins or guide structures for auxiliary limiting, leading to circumferential misalignment or axial displacement during assembly. Some designs intentionally enlarge positioning gaps to facilitate disassembly, but vibrations during equipment operation further exacerbate these gaps, ultimately causing a continuous deterioration in coaxiality. This precision deviation directly leads to a significant increase in friction between the screw and the inner wall of the cylinder, not only significantly increasing operating resistance and production energy consumption but also accelerating wear on both, drastically shortening the service life of core components. In more severe cases, it can cause "shaft seizure" failures, forcing the production line to shut down for emergency repairs, affecting production continuity and potentially incurring additional maintenance costs and economic losses due to component damage. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a modular composite cylinder for a screw extruder, which effectively solves the problems of friction, wear, and downtime losses caused by deficiencies in positioning structures and deterioration in accuracy due to gap vibration in existing modular composite cylinders.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a modular composite barrel for a screw extruder, comprising:

[0007] The machine body includes an outer cylinder disposed on the outside, an inner cylinder component disposed on the inner wall of the outer cylinder, and a screw rod disposed inside the inner cylinder component;

[0008] The inner cylinder includes a segmented material conveying cylinder segment. One end of the cylinder segment is fixedly connected to a flange end one, and the other end of the cylinder segment is fixedly connected to a flange end two. The adjacent flange ends one and two engage with each other. A guide ring is provided in the middle of the flange end two near the flange end one, and a guide groove is provided in the middle of the flange end one near the flange end two.

[0009] Protective retaining rings are symmetrically arranged on the outer walls of adjacent flange ends one and two.

[0010] A protrusion is fixedly connected to the end of flange one near flange two, and a slot is opened at the end of flange two near flange one, and the protrusion and the slot are engaged and connected.

[0011] The inner wall of the groove is provided with a stop block one along the circumference, and the outer wall of the slot is provided with a stop block two along the circumference. The side of the stop block one and the stop block two near the axis is set as an arc surface, and the arc surfaces are arranged opposite to each other.

[0012] The inner wall of the cylindrical section has a second pin hole along the circumference, and the inner wall of the flange end has a first pin hole along the circumference. The second pin hole and the first pin hole are fixedly connected by bolts.

[0013] A guide ring is fixedly connected to the end of flange end two near flange end one, and the outer wall of the guide ring is designed with an inclination.

[0014] A guide groove is provided on the inner wall of the flange end one near the flange end two, and the inner wall of the guide groove fits against the outer wall of the guide ring.

[0015] The inner wall of the protective retaining ring is fixedly connected to a side plate, the inner wall of the side plate is fitted with the ends of flange end one and flange end two that are far apart from each other, and a locking bolt is provided at the top of the protective retaining ring, the locking bolt penetrating the outer cylinder wall.

[0016] The technical solution provided by this invention has the following advantages compared with the prior art:

[0017] This invention features flange end one and flange end two. The inclined fit design of the guide ring and guide groove creates an automatic centering function during splicing, which can actively compensate for minor deviations during assembly. Combined with the radial engagement of the convex groove and the slot, it ensures the alignment of the axes of each cylinder section from both axial and radial dimensions, solving the coaxiality deviation problem caused by traditional single bolt positioning. The arc-shaped interlocking structure of stop block one and stop block two further restricts circumferential rotation, making the spliced ​​inner cylinder form a continuous and precise internal channel, providing a foundation for the stable operation of the screw. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 This is a schematic cross-sectional view of the outer cylinder structure according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the inner cylinder structure according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the cylindrical section structure according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the flange end structure according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of a flange end structure according to an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the protective retaining ring structure according to an embodiment of the present invention.

[0026] The labels in the diagram represent: 1. Body; 11. Outer cylinder; 12. Inner cylinder; 121. Cylinder section; 122. Flange end one; 1221. Groove; 1222. Stop block one; 1223. Pin hole one; 1224. Guide groove; 123. Flange end two; 1231. Slot; 1232. Stop block two; 1233. Pin hole two; 1234. Guide ring; 124. Protective retaining ring; 1241. Side plate; 13. Screw; 14. Locking bolt. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] The present invention will be further described below with reference to embodiments.

[0029] Example:

[0030] Please see Figures 1-7 This invention provides a technical solution for a spliced ​​composite cylinder of a screw extruder:

[0031] refer to Figure 1 and Figure 2 The main body 1 serves as the overall load-bearing foundation, employing a nested design of an outer cylinder 11 and an inner cylinder 12. The outer cylinder 11 provides rigid support and protection, while the internally assembled inner cylinder 12 directly undertakes the functions of material transfer and plasticizing. The screw 13 penetrates the interior of the inner cylinder 12, forming the core channel for material processing. This separation of inner and outer structures ensures overall strength while providing a spatial basis for the splicing and replacement of the inner cylinder 12, making the functional zoning clearer.

[0032] refer to Figure 3 and Figure 4 The segmented design of the inner cylinder 12 is one of the core innovations. It consists of multiple independent cylinder segments 121. Each cylinder segment 121 is fixedly connected to flange end one 122 and flange end two 123 at both ends. The segments are spliced ​​together by interlocking the flange ends one 122 and flange end two 123 of adjacent cylinder segments 121 to form a complete material conveying channel.

[0033] refer to Figure 5 and Figure 6 To achieve precise positioning during splicing, a guide ring 1234 is provided at the center of the end of flange end 2 (123) near flange end 1 (122). Correspondingly, a guide groove 1224 is provided at the center of the end of flange end 1 (122) near flange end 2 (123). The outer wall of the guide ring 1234 is inclined, and the inner wall of the guide groove 1224 is completely fitted with the outer wall of the guide ring 1234. This inclined guide structure can guide the two flange ends to automatically align during splicing, avoiding circumferential misalignment or axial displacement, and laying a precise benchmark for subsequent connection.

[0034] refer to Figure 5 and Figure 6 On the flange end engagement structure, a protrusion 1221 is fixedly connected to the end of flange end 122 near flange end 123, and a corresponding groove 1231 is provided on flange end 123. The protrusion 1221 and the groove 1231 form a tight engagement connection, further enhancing the radial limiting effect. At the same time, a stop block 1222 is provided circumferentially on the inner wall of the protrusion 1221, and a stop block 2 1232 is provided circumferentially on the outer wall of the groove 1231. The side of the stop block 1222 and the stop block 2 1232 near the axis are both designed to be arc-shaped and arranged opposite each other. This arc-shaped structure can form mutually interlocking force surfaces after engagement, which not only disperses the pressure at the splice, but also effectively prevents the two flange ends from rotating relative to each other during operation, thus improving the stability of the connection.

[0035] refer to Figure 5 and Figure 6To achieve rigid fixation of the flange end, a second pin hole 1233 is provided circumferentially inside the cylinder section 121, and a first pin hole 1223 is provided circumferentially inside the flange end 122. By passing bolts through the first pin hole 1223 and the second pin hole 1233, the adjacent flange end 122 and flange end 123 are firmly locked, so that the splice forms an integral load-bearing structure and avoids loosening of the connection due to vibration.

[0036] refer to Figure 7 Regarding external protection and reinforcement at the joint, protective retaining rings 124 are symmetrically arranged on the upper and lower outer walls of adjacent flange ends 122 and 123. Side plates 1241 are fixedly connected to the inner walls of the protective retaining rings 124. The inner walls of the side plates 1241 are tightly fitted to the ends of flange ends 122 and 123 that are furthest from each other. Locking bolts 14 at the top of the protective retaining rings 124 penetrate the outer cylinder 11 wall, forming a fixed connection between the protective retaining rings 124 and the outer cylinder 11 and inner cylinder 12. This external clamp-type structure provides secondary fixation at the flange joint, prevents external dust and impurities from entering the joint gap, and also disperses vibration stress generated during operation.

[0037] In terms of positioning accuracy, the inclined fit design of the guide ring 1234 and the guide groove 1224 forms an automatic centering function during splicing, which can actively compensate for minor deviations during assembly. Combined with the radial engagement of the protrusion 1221 and the slot 1231, it ensures the alignment of the axes of each cylinder section 121 in both axial and radial dimensions, solving the coaxiality deviation problem caused by traditional single bolt positioning. The arc-shaped interlocking structure of the first stop block 1222 and the second stop block 1232 further restricts circumferential rotation, making the spliced ​​inner cylinder 12 form a continuous and precise internal channel, providing a foundation for the stable operation of the screw 13.

[0038] In terms of connection stability, the triple fixing structure of "clamping + bolt fixing + external retaining ring" forms a three-dimensional protection. The engagement of the protrusion 1221 and the slot 1231 first forms a mechanical engagement, the bolt achieves rigid locking through the fixing of pin hole one 1223 and pin hole two 1233, and the protective retaining ring 124 forms an external circumferential constraint. The three work together to effectively resist the vibration and impact during equipment operation and prevent the gap from widening or loosening at the splice. In particular, the arc design of the first stop block 1222 and the second stop block 1232 can disperse concentrated stress into a uniform circumferential force, reduce local wear, and improve the durability of the connection structure.

[0039] In terms of assembly and maintenance, the segmented design makes the disassembly and assembly of the inner cylinder 12 more flexible. The tilting guiding function of the guide ring 1234 simplifies the assembly process, enabling precise docking without complex debugging tools, thus reducing assembly difficulty and labor costs. When a cylinder segment 121 is worn or damaged, it can be disassembled and replaced individually simply by loosening the corresponding bolts and protective retaining ring 124, without having to completely remove the inner cylinder 12 or outer cylinder 11, significantly shortening maintenance time and reducing production downtime losses. At the same time, the detachable design of the protective retaining ring 124 does not affect normal maintenance operations and provides continuous protection during use.

[0040] In terms of structural adaptability, the combination of multiple independent cylinder sections 121 allows for adjustment of the overall length and section configuration of the inner cylinder 12 according to production needs, flexibly adapting to extruders of different specifications and processing requirements of different types of materials. The nested structure of the outer cylinder 11 and the inner cylinder 12 makes the material selection of the inner cylinder 12 more flexible, allowing for the use of differentiated composite materials for the working requirements of different cylinder sections 121, controlling manufacturing costs while ensuring processing performance, and improving the versatility and economy of the equipment.

[0041] In terms of protective performance, the combined structure of the protective retaining ring 124 and the side plate 1241 can effectively block external dust, oil and other impurities from entering the flange end splicing gap, avoiding sealing failure or aggravated wear caused by impurities; at the same time, the multiple bonding structure at the splicing point reduces heat loss, helps maintain the temperature stability inside the inner cylinder 12, and provides a good temperature environment for material plasticization.

[0042] Thorough preparation is required before assembly. First, a comprehensive inspection of all components must be conducted to confirm that all parts of the body 1, outer cylinder 11, and inner cylinder 12, including cylinder section 121, flange end one 122, flange end two 123, and protective retaining ring 124, are free from deformation, cracks, or other defects. All mating surfaces, such as guide ring 1234, guide groove 1224, protrusion 1221, and retaining groove 1231, must be smooth and free from oil stains, iron filings, or other impurities. Simultaneously, prepare the necessary bolts, locking bolts 14, and other fasteners, as well as assembly tools, cleaning supplies, and testing instruments to ensure a smooth assembly process.

[0043] Next, the inner cylinder component 12 is segmented and assembled, which is the core step in the assembly process. First, the first cylinder segment 121 to be assembled is selected as the reference segment and placed on a flat assembly platform, ensuring that flange end 123 is facing upwards and remains horizontal. Then, the second cylinder segment 121 is selected, and the flange end 122 of the second cylinder segment is aligned with the flange end 123 of the reference segment. Through the inclined guiding action of the guide ring 1234, the second cylinder segment 121 is slowly pushed, so that the guide ring 1234 gradually embeds into the guide groove 1224. During this process, the contact surfaces of the guide ring 1234 and the guide groove 1224 will automatically guide the axes of the two cylinder segments 121 to align, avoiding misalignment.

[0044] After the guide ring 1234 is fully embedded in the guide groove 1224, continue pushing the second cylinder section 121 so that the protrusion 1221 on flange end one 122 slowly engages with the groove 1231 on flange end two 123, until the arc surfaces of stop block one 1222 and stop block two 1232 are completely in contact. At this point, the two flange ends are tightly engaged, and both radial and circumferential directions are effectively limited. Subsequently, bolts are passed through the pin holes one 1223 of flange end one 122 and the pin holes two 1233 of cylinder section 121 one by one along the circumferential direction, and the bolts are tightened gradually in a diagonal manner to ensure that the two flange ends are evenly stressed and to avoid local gaps.

[0045] Repeat the above steps to sequentially assemble the remaining cylinder segments 121 according to production requirements until a complete inner cylinder component 12 is formed. After assembling each cylinder segment 121, check the fit and coaxiality at the splice to ensure there is no looseness or misalignment, and avoid cumulative errors affecting the overall accuracy.

[0046] After the inner cylinder component 12 is assembled, the protective retaining rings 124 are installed. The upper and lower protective retaining rings 124 are respectively fastened to the outer walls of the adjacent flange ends 122 and 123. The position of the protective retaining rings 124 is adjusted so that the inner wall of the side plate 1241 is tightly fitted to the ends of the two flanges that are furthest from each other, ensuring that the protective retaining rings 124 completely cover the joint. Then, the locking bolts 14 are passed through the through hole at the top of the protective retaining rings 124 and the pre-drilled hole in the outer cylinder 11, and the locking bolts 14 are slowly tightened to firmly fix the protective retaining rings 124 onto the outer cylinder 11, providing external constraint to the joint.

[0047] After installing all the protective retaining rings 124, hoist the assembled inner cylinder 12 into the outer cylinder 11 as a whole. Adjust the position of the inner cylinder 12 to ensure that it fits evenly against the inner wall of the outer cylinder 11 without any obvious deviation. Then check the tightness of each connection and tighten all bolts and locking bolts 14 again to ensure that there is no looseness.

[0048] After assembly, a no-load test run is required to verify the stability and precision of the structure. Start the extruder's drive system and run the screw 13 without material. During operation, closely observe the equipment's operating status, including whether there is abnormal vibration or noise, whether there are any signs of loosening at the joints, and whether the screw 13 rotates smoothly.

[0049] After running for a period of time, the equipment should be shut down for a comprehensive inspection, with a focus on checking the coaxiality of the inner cylinder 12, the gap changes at each joint, and the tightness of the bolts and locking bolts 14. If coaxiality deviations or loose joints are found, the positions of the relevant components should be adjusted in time and the bolts retightened. If abnormal vibrations or noises are present, the installation position of the protective retaining ring 124 should be checked for accuracy, and the tightening force of the protective retaining ring 124 should be adjusted if necessary.

[0050] After the no-load test run is successful, a load test run is conducted. A small amount of material to be processed is added to the inner cylinder 12, and the equipment is started to simulate the normal processing flow. Under load, the temperature distribution of the inner cylinder 12, the material conveying, and whether there are any problems such as material leakage or abnormal heat loss at the joints are closely monitored. If material leakage is found, the engagement of the flange end and the sealing effect of the protective retaining ring 124 should be checked, and tightening or adjustment measures should be taken in time. If the temperature distribution is uneven, the fit at the joints should be checked to ensure stable heat transfer.

[0051] After the load test run confirms there are no abnormalities, the equipment can enter the normal production stage. Based on the requirements of the processed materials, set the corresponding process parameters such as temperature and speed, and start the equipment for continuous production. During production, conduct regular inspections of the equipment, focusing on the condition of each joint, including the tightness of bolts and locking bolts 14, the integrity of the protective retaining rings 124, and the operating status of the inner cylinder 12, promptly identifying and addressing any potential problems.

[0052] When the equipment has been running for a certain period of time, or when wear or damage is found in a certain section 121, maintenance and replacement are required. During maintenance, first stop the machine and disconnect the power supply. After the equipment has cooled down, loosen the locking bolts 14 at the joint of the corresponding section 121, remove the protective retaining ring 124, and then unscrew the bolts at the connecting flange end. The damaged section 121 can then be removed from the inner cylinder 12.

[0053] When replacing the new cylinder section 121, follow the assembly steps to precisely align the new cylinder section 121 with the adjacent cylinder section 121, completing operations such as locking, bolt fixing, and installation of the protective retaining ring 124. After replacement, conduct a brief trial run, and production can resume once no abnormalities are confirmed.

[0054] Traditional spliced ​​cylinder flange joints often rely on a single seal. Under high temperature, high pressure, and material erosion, this seal is prone to aging and failure, leading to leakage of molten material from the joint gap. This not only wastes material but also pollutes the equipment environment and may even pose safety hazards. This design utilizes a multi-layered, collaborative sealing system: the groove 1221 on flange end 122 and the slot 1231 on flange end 223 form the first mechanical seal, creating a tight seal that prevents material penetration; the inclined fit of the guide ring 1234 and guide groove 1224 forms the second seal, increasing the resistance to material leakage; the wrapping design of the external protective ring 124 and side plate 1241 forms the third layer of protection, preventing external impurities from entering and further compacting the joint gap to prevent material leakage from the flange outer wall. This triple-seal structure eliminates the need for easily aging seals, achieving long-term sealing through the rigid fit of the mechanical structure, thus solving the problem of frequent leakage at traditional cylinder joints.

[0055] Traditional integral or simply spliced ​​cylinder designs are susceptible to structural influences in heat transfer. Gaps at the joints lead to rapid heat loss, and temperature interference between different sections makes precise zoned temperature control difficult, affecting material plasticization quality. This design achieves precise temperature field control through structural optimization: the nested structure of the outer cylinder 11 and inner cylinder 12 forms an insulated cavity, reducing heat exchange between the inner cylinder 12 and the outside environment; the multiple fitting structures of the grooves 1221, slots 1231, and guide rings 1234 at the joints eliminate gaps in traditional splicing, preventing heat loss through these gaps; each cylinder section 121 is independently designed and rigidly connected via flanges, allowing each section to be individually equipped with a heating or cooling device. Heat conduction between sections is evenly distributed by the metal structure at the flanges, reducing temperature interference. Simultaneously, the protective retaining rings 124 further reduce heat loss at the joints, creating a stable temperature gradient within the inner cylinder 12, meeting the plasticization requirements of heat-sensitive and high-precision materials, and solving the problem of insufficient temperature control precision in traditional cylinder designs.

[0056] During extruder operation, the high-speed rotation of the screw 13 generates continuous vibration. Traditional spliced ​​barrels, due to insufficient rigidity at the joints, easily amplify this vibration, leading to fatigue damage at the connection points. Long-term operation may result in flange deformation, bolt breakage, and other malfunctions. This design enhances vibration and fatigue resistance through multiple structural reinforcements: the arc-shaped interlocking structure of stop block 1222 and stop block 2 1232 transforms the circumferential force generated by vibration into uniform interlocking stress, avoiding localized stress concentration; the external circumferential constraint of the protective retaining ring 124 enhances the overall rigidity of the splice, making adjacent barrel sections 121 form a unified force-bearing structure, reducing vibration displacement; the tight fit between bolts and pin holes 1223 and 1233, along with the secondary fixing of the locking bolt 14, forms a rigid support system that effectively absorbs vibration energy. These structures work synergistically to suppress the transmission and amplification of vibration, disperse fatigue stress, and solve the problems of structural fatigue and shortened lifespan caused by vibration in traditional spliced ​​barrels.

[0057] Traditional cylinder bodies are often manufactured using a single material, making it difficult to simultaneously meet multiple requirements such as wear resistance, corrosion resistance, and thermal conductivity. For example, when dealing with highly filled or corrosive materials, the inner wall is prone to wear or corrosion, while using a high-temperature alloy for integral manufacturing leads to excessively high costs. The segmented and nested composite structure of this design provides a basis for differentiated material configuration: each section 121 of the inner cylinder 12 can use different composite materials depending on the working scenario. For example, the feeding section 121 uses a composite structure of a wear-resistant alloy liner and a structural steel outer jacket, the plasticizing section uses a high thermal conductivity alloy material, and the head end uses a corrosion-resistant alloy material; the outer cylinder 11 uses high-strength structural steel to ensure overall rigidity. This "material selection on demand" design not only solves the problem of insufficient functionality of a single material but also avoids the high cost of using high-end materials for the entire machine. This allows the cylinder body to adapt to the processing needs of various complex materials such as highly filled, corrosive, and heat-sensitive materials, expanding the application range of the equipment.

[0058] Traditional modular cylinder positioning datums are prone to wear after repeated disassembly and assembly, leading to increased coaxiality and roundness errors during repeated assembly, resulting in a continuous decrease in accuracy and affecting the long-term operational stability of the equipment. This design solves this problem through a precise positioning structure and the selection of wear-resistant materials: the mating structure of the conical positioning pin and the guide sleeve forms a stable positioning datum; the positioning pin is made of high-strength wear-resistant alloy, and the mating surfaces are hardened to reduce wear during disassembly and assembly; the stop structure at the flange end and the guide groove 1224 of the guide ring 1234 form a dual positioning datum, mutually verifying and compensating for each other, avoiding accuracy deviations caused by wear of a single datum; the side plate 1241 of the protective retaining ring 124 protects the flange end face from damage during disassembly and assembly, maintaining the integrity of the positioning datum. These designs enable the cylinder to maintain high assembly accuracy even after repeated disassembly and assembly, solving the technical problem of accuracy decay during repeated assembly of traditional modular cylinders.

[0059] Traditional spliced ​​cylinder designs often suffer from stepped or gap-like joints, leading to material stagnation. Under prolonged high temperatures, this material degrades and carbonizes, contaminating the finished product and affecting quality. Furthermore, stagnant material exacerbates wear between the screw 13 and the cylinder wall. This design eliminates material stagnation through a smooth inner wall transition and a tightly fitting structure: the inner walls of each cylinder section 121 are precision-machined; the fit between the guide ring 1234 and guide groove 1224 during splicing ensures continuity of the inner wall; the engagement of the protrusion 1221 and the slot 1231 eliminates gaps and prevents the formation of "dead material zones"; the arc-shaped design of the first stop 1222 and the second stop 1232 ensures a smooth internal transition at the splice, without sharp edges or protrusions, allowing material to pass through smoothly. This structural design fundamentally solves the problems of material stagnation and degradation, ensuring product quality while reducing component wear caused by stagnant material.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular composite cylinder for a screw extruder, characterized in that, include: The machine body (1) includes an outer cylinder (11) disposed on the outside, and a spliced ​​inner cylinder component (12) is provided on the inner wall of the outer cylinder (11), and a screw (13) is provided inside the inner cylinder component (12). The inner cylinder (12) includes a segmented material conveying cylinder (121). One end of the cylinder (121) is fixedly connected to a flange end (122), and the other end of the cylinder (121) is fixedly connected to a flange end (123). The adjacent flange end (122) and flange end (123) engage with each other. A guide ring (1234) is provided in the middle of the end of flange end (123) near flange end (122), and a guide groove (1224) is provided in the middle of the end of flange end (122) near flange end (123). Among them, protective retaining rings (124) are symmetrically arranged on the outer walls of adjacent flange end one (122) and flange end two (123).

2. The spliced ​​composite cylinder of a screw extruder according to claim 1, characterized in that: A groove (1221) is fixedly connected to one end of flange end one (122) near flange end two (123), and a slot (1231) is opened at one end of flange end two (123) near flange end one (122). The groove (1221) and the slot (1231) are engaged and connected.

3. The spliced ​​composite cylinder of a screw extruder according to claim 2, characterized in that: The inner wall of the groove (1221) is provided with a stop block 1 (1222) along the circumferential direction, and the outer wall of the slot (1231) is provided with a stop block 2 (1232) along the circumferential direction. The side of the stop block 1 (1222) and the stop block 2 (1232) near the axis is set as an arc surface, and the arc surface is set opposite to each other.

4. The spliced ​​composite cylinder of a screw extruder according to claim 1, characterized in that: The inner wall of the cylindrical section (121) is provided with a second pin hole (1233) along the circumferential direction, and the inner wall of the flange end (122) is provided with a first pin hole (1223) along the circumferential direction. The second pin hole (1233) and the first pin hole (1223) are fixedly connected by bolts.

5. The spliced ​​composite cylinder of a screw extruder according to claim 1, characterized in that: A guide ring (1234) is fixedly connected to one end of the flange end two (123) near the flange end one (122), and the outer wall of the guide ring (1234) is designed with an inclination.

6. The spliced ​​composite cylinder of a screw extruder according to claim 5, characterized in that: A guide groove (1224) is provided on the inner wall of the flange end one (122) near the flange end two (123), and the inner wall of the guide groove (1224) is in contact with the outer wall of the guide ring (1234).

7. The spliced ​​composite cylinder of a screw extruder according to claim 1, characterized in that: The inner wall of the protective retaining ring (124) is fixedly connected to a side plate (1241). The inner wall of the side plate (1241) is attached to the flange end one (122) and flange end two (123) which are far apart from each other. The top of the protective retaining ring (124) is provided with a locking bolt (14), which penetrates the outer cylinder (11) wall.

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