Screw extruder with exhaust structure

Abstract

The utility model relates to the technical field of vacuum material pressing and exhausting, in particular to a screw extruder with an exhausting structure, which aims at solving the technical problem of overcoming the defects of an exhausting connecting structure and extrusion cooling in the prior art and is mainly realized by the following technical scheme. Comprising a screw extrusion device, a driving device and a vacuum material pressing device, the screw extrusion device comprises a device barrel and an extrusion screw, the extrusion screw comprises a feeding section, a desulfurization section, an exhaust section and an extrusion section, the device barrel comprises a feeding machine barrel, a desulfurization machine barrel, an exhaust machine barrel and an extrusion machine barrel, and two exhaust holes are formed in the exhaust machine barrel; the exhaust holes are connected with the vacuum material pressing device through the transition cylinder or connected with the blind plate, the two exhaust holes are arranged to be matched with the vacuum material pressing device to achieve exhaust operation on rubber materials, the transition cylinder is additionally arranged on the exhaust holes to avoid direct contact between the vacuum material pressing device and the exhaust machine cylinder, the service life of the exhaust machine cylinder is prolonged, and the transition cylinder is convenient to disassemble and replace.

Description

Technical Field

[0001] This utility model relates to the field of vacuum extrusion technology, specifically to a screw extruder with an exhaust structure. Background Technology

[0002] Screw extruders are key equipment in plastic material production, capable of mixing, melting, and conveying formulated materials, and possessing excellent feeding, mixing and plasticizing, venting, and extrusion stability. During the modification and processing of plastic materials, screw extruders typically employ vacuum venting to remove low-molecular-weight substances from the melt, thereby ensuring the performance of the produced plastic products.

[0003] In existing technologies, the vacuum exhaust pipe and the screw section are directly fixed with bolts. Because vacuuming is required at this point, there is significant wear between the vacuum exhaust pipe and the screw section, necessitating frequent disassembly and replacement. Replacement and maintenance also require removing the screw section at this point, which is time-consuming, labor-intensive, and costly. During screw extrusion, the viscosity properties of the plastic need to be addressed to ensure that it can transform from an elastic state into a plastic and viscous plastic product that can be re-cured. This requires considering the overall performance of the screw extruder to ensure sufficient desulfurization, as well as temperature changes to ensure the performance of the plastic product. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the defects of the exhaust connection structure and extrusion cooling in the prior art, thereby providing a screw extruder with an exhaust structure.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A screw extruder with a venting structure includes a screw extrusion unit, a drive unit, and a vacuum pressing unit. The drive unit is located at one end of the screw extrusion unit and controls its movement. A feeding port is provided above the end of the screw extrusion unit near the drive unit. The vacuum pressing unit is located near the middle of the screw extrusion unit. The screw extrusion unit includes a device cylinder and an extrusion screw. The extrusion screw is rotatably mounted inside the device cylinder and its rotation is controlled by the drive unit. The extrusion screw includes a feeding section, a desulfurization section, a venting section, and an extrusion section connected in sequence. The device cylinder is provided with a feeder cylinder, a desulfurization cylinder, a venting cylinder, and an extrusion cylinder corresponding to the feeding section, desulfurization section, venting section, and extrusion section, respectively. The feeder cylinder is located corresponding to the feeding port. Two vent holes are provided at the venting cylinder. The vent holes are connected to the vacuum pressing unit or to a blind plate. The vent holes are connected to the vacuum pressing unit through a transition cylinder. The transition cylinder or the blind plate is fixed to the venting cylinder with bolts.

[0007] By adopting the above technical solution, the crushed and magnetically separated rubber particles are fed into the screw extruder through the feeding port for stirring, desulfurization and extrusion. The rubber compound is first pre-mixed in the feeding section and then sent to the desulfurization section for continuous desulfurization. Then, it is vented and deodorized in the exhaust section. Finally, it is extruded into sheets by the extrusion section, thus completing the overall desulfurization of the rubber compound and obtaining recycled rubber compound.

[0008] Two vent holes are installed at the venting cylinder corresponding to the venting section. One or two vent holes can be selected depending on the desired quality of the reclaimed rubber to be molded. Using two vent holes to connect two vacuum pressing devices is suitable for high-quality sheet production, improving the quality and performance of the rubber compound. A blind plate is used to block the other vent hole when only one vent hole is selected, preventing material leakage. The vacuum pressing device is connected to the venting cylinder via a transition cylinder. During use, this increases the venting stroke of the vacuum pressing device, reducing material leakage and blockage in the suction components. It also acts as a connecting element, increasing the structural strength of the venting cylinder and extending its service life. Replacement only requires replacing the transition cylinder component, reducing the hassle of overall disassembly and maintenance, saving time, effort, and reducing maintenance costs.

[0009] Furthermore, the exhaust cylinder is provided with a slowing cylinder and an exhaust main cylinder connected in sequence. The slowing cylinder and the exhaust main cylinder are fixedly connected by a flange. The slowing cylinder and the desulfurization cylinder, and the exhaust main cylinder and the extruder cylinder are also fixedly connected by flanges. Two water exchange pipes are arranged in an axial array at the bottom of the slowing cylinder. The axis of the water exchange pipes is perpendicular to the axis of the slowing cylinder. The slowing cylinder is also provided with a water exchange trough that is connected to both water exchange pipes.

[0010] By adopting the above technical solution, the rubber compound is desulfurized by being broken by pins and then vented and deodorized at the exhaust cylinder. The water exchange tank opened in the slowing cylinder, together with the heat exchange tube, controls the cooling at this point separately. No related water tank is opened on the exhaust main cylinder to avoid affecting the structural strength of the exhaust main cylinder.

[0011] Furthermore, the top outer wall of the exhaust main cylinder is provided with two exhaust holes arranged in an axial array. The axis of the exhaust holes is perpendicular to the axis of the exhaust main cylinder. The top of the exhaust holes extends into a snap-fit ​​hole with a diameter larger than the exhaust hole. The top of the snap-fit ​​hole also extends into a mounting groove with a diameter larger than the snap-fit ​​hole. A transition cylinder or blind plate is installed in the mounting groove.

[0012] By adopting the above technical solution, the extended snap-fit ​​hole and mounting groove on the exhaust port are used to facilitate the subsequent installation of the transition cylinder or blind flange.

[0013] Furthermore, the transition cylinder has a vertical axis and includes an integrally formed connecting cylinder body, a first flange, and a second flange. The first flange and the second flange extend to both ends of the connecting cylinder body and their diameters are both larger than the diameter of the connecting cylinder body. The first flange extends to the bottom of the connecting cylinder body and engages with the mounting groove. The bottom of the first flange extends downward to form a snap-fit ​​flange that mates with the snap-fit ​​hole. The second flange extends to the top of the connecting cylinder body and is fixed to the vacuum pressing device by bolts. A clearance groove that mates with the vacuum pressing device is also provided at the center of the top of the second flange.

[0014] By adopting the above technical solution, a transition cylinder is set to connect with the exhaust main cylinder and the vacuum pressing device, avoiding direct insertion of the vacuum pressing device, increasing the structural strength of the connection, extending the service life of the exhaust main cylinder, and allowing for partial replacement during replacement, thus reducing maintenance costs.

[0015] Furthermore, the blind plate has a vertical axis and includes an integrally formed mounting plate and a plug. The outer diameter of the mounting plate corresponds to the inner diameter of the mounting groove and is fixed to the mounting groove by bolts. The diameter of the plug corresponds to the diameter of the vent hole. A snap-fit ​​block extends between the mounting plate and the plug, and the diameter of the snap-fit ​​block corresponds to the snap-fit ​​hole.

[0016] By adopting the above technical solution, when using a single exhaust, one of the exhaust holes is blocked by a blind plate to prevent material leakage or oxidation of the adhesive material upon contact with air. The snap-fit ​​block facilitates the snap-fit ​​of the blind plate and forms a stepped structure, which increases the air travel and also plays a certain sealing role, making it easier for gas to be discharged from the single exhaust hole.

[0017] Furthermore, the feeding cylinder includes a first feeding cylinder and a second feeding cylinder, which are connected by a flange and the second feeding cylinder is also connected to the desulfurization cylinder by a flange. The first feeding cylinder has a feeding port at one end and a feeding pipe extends from the feeding port. The bottom of both the first and second feeding cylinders are arranged with two heating pipes in an axial array. The heating pipes are vertically arranged and perpendicular to the axial direction of the feeding section. The bottom of the first feeding cylinder has an arc-shaped heating groove that communicates with the corresponding heating pipe. The inner ring of the second feeding cylinder has a heating groove that communicates with the corresponding heating pipe.

[0018] By adopting the above technical solution, the rubber compound is fed into the feed port and premixed in the first feeder cylinder. After being mixed evenly, it is fed into the second feeder cylinder for preheating, which facilitates the subsequent desulfurization operation.

[0019] Furthermore, the desulfurization barrel includes at least four pin-type barrels connected in sequence. The pin-type barrels at both ends are respectively connected to the second feeding barrel and the exhaust barrel. Each pin-type barrel has two heat exchange tubes arranged in an axial array at its bottom. The axis of the heat exchange tubes is vertical and perpendicular to the axis of the desulfurization section. The inner ring of the pin-type barrel is provided with a heat exchange groove that is connected to both heat exchange tubes.

[0020] By adopting the above technical solution, the multi-segment pin barrel, combined with the long internal desulfurization section, achieves a high-intensity mixing and shearing effect, thus realizing effective desulfurization of the rubber compound. Corresponding heat exchange tubes and heat exchange tanks are set at each pin barrel segment, which can cool the overheated desulfurization section while utilizing the heat of the desulfurization section to achieve energy-saving production.

[0021] Furthermore, the extruder barrel includes a buffer barrel, a secondary pin barrel, and an extrusion barrel connected in sequence. The buffer barrel is connected to the exhaust barrel. The end of the extrusion barrel away from the secondary pin barrel has an extrusion port. Two vertically arranged heat-insulating pipes are arranged in an array along the axial direction of the extrusion section at the bottom of the buffer barrel. The inner ring of the buffer barrel is provided with a heat-insulating groove that communicates with the heat-insulating pipes. Two vertically arranged slow-cooling pipes are arranged in an array along the axial direction of the extrusion section at the bottom of the secondary pin barrel. The inner ring of the secondary pin barrel is provided with a slow-cooling groove that communicates with the slow-cooling pipes. Two vertically arranged forced-cooling pipes are arranged in an array along the axial direction of the extrusion section at the bottom of the extrusion barrel. The inner ring of the extrusion barrel is provided with a forced-cooling groove that communicates with the forced-cooling pipes.

[0022] By adopting the above technical solution, the extrusion section controls the overall extrusion temperature of the rubber compound and improves the performance of reclaimed rubber through the setting of buffer barrel, secondary pin barrel and extrusion barrel.

[0023] In summary, the technical solution of this utility model has the following advantages:

[0024] 1. The screw extruder with venting structure provided by this utility model is equipped with a device cylinder and an extrusion screw to realize the continuous production of rubber compound. The crushed and magnetically separated rubber particles are fed into the screw extrusion device through the feed port for stirring, desulfurization and extrusion. The rubber compound is first pre-mixed and stirred in the feeding section and then sent to the desulfurization section for continuous desulfurization. Then, it is vented and deodorized in the venting section. Finally, it is extruded into sheets by the extrusion section, thus completing the overall desulfurization of the rubber compound and obtaining recycled rubber compound.

[0025] 2. The screw extruder with venting structure provided by this utility model has a vacuum pressing device connected to the venting barrel through a transition cylinder. During use, it can increase the venting stroke of the vacuum pressing device, reduce the leakage of rubber material and prevent it from entering the suction component and causing blockage. The transition cylinder can also play a connecting role, increase the structural strength of the venting barrel, and extend its service life. When replacing it, only the transition cylinder component needs to be replaced, reducing the trouble of overall disassembly and maintenance, saving time and effort and reducing maintenance costs.

[0026] 3. The screw extruder with exhaust structure provided by this utility model has individually controlled pipelines and grooves on the feeding barrel, desulfurization barrel, exhaust barrel, and extrusion barrel. It can be independently adjusted according to the temperature requirements of different sections, so as to realize the heating in the feeding section, the heat exchange cooling in the desulfurization section, the heat preservation before and after the exhaust section, and the extrusion sheeting operation after forced cooling in the extrusion section. This ensures that the overall production process is stable and locally adjustable, and the temperature change is highly flexible to adapt to the production process. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic cross-sectional view of a screw extruder with a venting structure provided in one embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional view of the feeder cylinder provided in one embodiment of the present utility model;

[0030] Figure 3 This is a cross-sectional view of a desulfurization barrel provided in one embodiment of the present utility model;

[0031] Figure 4 This is a cross-sectional view of an exhaust cylinder provided in one embodiment of the present utility model;

[0032] Figure 5 This is a cross-sectional view of an extruder barrel provided in one embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Screw extruder; 2. Unit barrel; 21. Feeder barrel; 211. First feeder barrel; 2111. Feed inlet; 2112. Feed pipe; 212. Second feeder barrel; 213. Heating pipe; 214. Heating tank; 22. Desulfurization barrel; 221. Pin barrel; 2211. Heat exchange pipe; 2212. Heat exchange tank; 23. Exhaust barrel; 231. Decelerator barrel; 2311. Water exchange pipe; 2312. Water exchange tank; 232. Main exhaust barrel; 2321. Exhaust port; 2322. Snap-fit ​​hole; 2323. Mounting slot; 24. Extruder barrel; 241. Buffer machine 2411. Insulation pipe; 2412. Insulation tank; 242. Secondary pin cylinder; 2421. Slow cooling pipe; 2422. Slow cooling tank; 243. Extrusion cylinder; 2431. Forced cooling pipe; 2432. Forced cooling tank; 3. Extrusion screw; 31. Feeding section; 32. Desulfurization section; 33. Exhaust section; 34. Extrusion section; 4. Vacuum pressing device; 5. Drive device; 6. Transition cylinder; 61. Connecting cylinder; 62. First flange; 621. Snap-fit ​​flange; 63. Second flange; 631. Relief groove; 7. Blind plate; 71. Mounting plate; 72. Plug; 73. Snap-fit ​​block. Detailed Implementation

[0035] 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 only for explaining the present invention and are not intended to limit the present invention.

[0036] A screw extruder with a venting structure, such as Figure 1 As shown, it includes a screw extrusion device 1, a drive device 5, and a vacuum pressing device 4. The drive device 5 is located at the left end of the screw extrusion device 1. The screw extrusion device 1 includes a device barrel 2 and an extrusion screw 3. The extrusion screw 3 is rotatably mounted inside the device barrel 2 and is controlled to rotate by the drive device 5. A feeding port 2111 is provided above the end of the screw extrusion device 1 near the drive device 5. In this application, the feeding port 2111 is provided above the left end of the device barrel 2.

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the extrusion screw 3 includes a feeding section 31, a desulfurization section 32, an exhaust section 33, and an extrusion section 34 connected in sequence. The feeding section 31 is a continuous screw for material conveying. The desulfurization section 32 consists of an intermittent screw with multiple pins arranged in an array along the axis to shear and break the rubber material during conveying, thus achieving the purpose of the desulfurization section 32. The exhaust section 33 consists of two screws with different diameters, with the inner diameter of the latter screw being smaller than that of the former. This allows for smooth and slow conveying after desulfurization, followed by rapid and large-volume exhaust at the exhaust port 2321, preventing excessive cooling due to prolonged time at this point, which could affect the performance of the reclaimed rubber. The middle section of the extrusion section 34 consists of an intermittent screw with pins, which shears the rubber material again before extrusion to ensure the quality of the reclaimed rubber output.

[0038] After being crushed and magnetically separated, the rubber particles are fed into the screw extrusion unit 1 through the feed port 2111 for stirring, desulfurization and extrusion. The rubber compound is first pre-mixed in the feeding section 31 and then sent to the desulfurization section 32 for continuous desulfurization. Then, it is vented and deodorized in the exhaust section 33. Finally, it is extruded into sheets by the extrusion section 34, thus completing the overall desulfurization of the rubber compound and obtaining recycled rubber compound.

[0039] The device cylinder 2 is equipped with a feeder cylinder 21, a desulfurization cylinder 22, an exhaust cylinder 23, and an extrusion cylinder 24 corresponding to the feeding section 31, desulfurization section 32, exhaust section 33, and extrusion section 34, respectively. Each feeder cylinder 21, desulfurization cylinder 22, exhaust cylinder 23, and extrusion cylinder 24 is equipped with individually controlled pipelines and grooves, allowing for independent adjustments based on the temperature requirements of different sections. This enables heating in the feeding section 31, heat exchange cooling in the desulfurization section 32, heat preservation before and after the exhaust section 33, and forced cooling before extrusion in the extrusion section 34, ensuring a stable overall production process with local adjustability and high flexibility in temperature changes to adapt to the production process.

[0040] The feeding cylinder 21 is positioned corresponding to the feeding port 2111. Two vent holes 2321 are provided at the venting cylinder 23. The vent holes 2321 are connected to the vacuum pressing device 4 or to the blind plate 7. The vent holes 2321 are connected to the vacuum pressing device 4 via a transition cylinder 6. Both the transition cylinder 6 and the blind plate 7 are fixed to the venting cylinder 23 with bolts. Two vent holes 2321 are provided at the venting cylinder 23 corresponding to the venting section 33. One or two vent holes 2321 can be selected depending on the desired quality of the reclaimed rubber. Using two vent holes 2321 connected to two vacuum pressing devices 4 is suitable for high-quality sheet production, improving the quality and performance of the rubber compound. The blind plate 7 is used to block the other vent hole 2321 when only one vent hole 2321 is selected, preventing material leakage from that point.

[0041] like Figure 1 and Figure 2As shown, the feeder cylinder 21 includes a first feeder cylinder 211 and a second feeder cylinder 212. The first feeder cylinder 211 and the second feeder cylinder 212 are connected by a flange, and the second feeder cylinder 212 is also connected to the desulfurization cylinder 22 by a flange. The upper left end of the first feeder cylinder 211 is provided with a feed port 2111, and a feed pipe 2112 is extended from the feed port 2111. The bottom of the first feeder cylinder 211 and the second feeder cylinder 212 are both arranged in an axial array with two heating pipes 213. The axis of the heating pipes 213 is vertically arranged and perpendicular to the axis of the feeding section 31. The bottom of the first feeder cylinder 211 is provided with an arc-shaped heating groove 214 that communicates with the corresponding heating pipe 213. The inner ring of the second feeder cylinder 212 is provided with a heating groove 214 that communicates with the corresponding heating pipe 213. The rubber compound is fed into the feed port 2111 and premixed in the first feeder cylinder 211. After being mixed evenly, it is fed into the second feeder cylinder 212 for preheating, which facilitates the subsequent desulfurization operation.

[0042] like Figure 1 and Figure 3 As shown, the desulfurization barrel 22 includes at least four pin-type barrel sections 221 connected in sequence. The pin-type barrel sections 221 at both ends are connected to the second feeding barrel 212 and the exhaust barrel 23, respectively. Each pin-type barrel section 221 has two heat exchange tubes 2211 arranged in an array along the axial direction of the desulfurization section 32 at its bottom. The axes of the heat exchange tubes 2211 are vertical and perpendicular to the axial direction of the pin-type barrel section 221. A heat exchange groove 2212 is provided within the inner ring of the pin-type barrel section 221, communicating with both heat exchange tubes 2211. The multi-segment pin-type barrel sections 221, combined with the relatively long internal desulfurization section 32, achieve a high-intensity mixing and shearing effect, realizing effective desulfurization of the rubber compound. Each pin-type barrel section 221 is equipped with a corresponding heat exchange tube 2211 and a heat exchange groove 2212, which cools the overheated desulfurization section 32 while utilizing the heat from the desulfurization section 32, achieving energy-saving production.

[0043] like Figure 1 and Figure 4 As shown, the exhaust cylinder 23 is provided with a retarder cylinder 231 and an exhaust main cylinder 232 connected in sequence. The retarder cylinder 231 and the exhaust main cylinder 232 are fixedly connected by flanges. The retarder cylinder 231 is also fixedly connected to the desulfurization cylinder 22, and the exhaust main cylinder 232 is fixedly connected to the extruder cylinder 24 by flanges. Two water exchange pipes 2311 are arranged in an axial array at the bottom of the retarder cylinder 231. The axis of the water exchange pipes 2311 is perpendicular to the axis of the retarder cylinder 231. The retarder cylinder 231 also has a water exchange trough 2312 inside, which is connected to both water exchange pipes 2311. After the rubber compound is desulfurized by being broken by pins, it is vented and deodorized at the exhaust cylinder 23. The water exchange trough 2312 opened in the retarder cylinder 231, together with the heat exchange pipe 2211, independently controls the cooling at this point. No water trough is opened on the exhaust main cylinder 232 to avoid affecting the structural strength of the exhaust main cylinder 232.

[0044] Two exhaust holes 2321 are arranged axially on the outer side wall of the top of the exhaust main cylinder 232. The axis of the exhaust holes 2321 is perpendicular to the axis of the exhaust main cylinder 232. The top of the exhaust holes 2321 extends a snap-fit ​​hole 2322 with a diameter larger than the exhaust hole 2321. The top of the snap-fit ​​hole 2322 also extends a mounting groove 2323 with a diameter larger than the snap-fit ​​hole 2322. A transition cylinder 6 or a blind flange 7 is installed in the mounting groove 2323. The snap-fit ​​hole 2322 and the mounting groove 2323 extending from the exhaust holes 2321 are used to facilitate the subsequent installation of the transition cylinder 6 or the blind flange 7.

[0045] The vacuum pressing device 4 is connected to the exhaust cylinder 23 through the transition cylinder 6. When in use, it can increase the exhaust stroke of the vacuum pressing device 4, reduce the leakage of rubber material and prevent it from entering the suction component and causing blockage. It can also play a connecting role, increase the structural strength of the exhaust cylinder 23, and extend its service life. When replacing, only the transition cylinder 6 needs to be replaced, reducing the trouble of overall disassembly and maintenance, saving time and effort and reducing maintenance costs.

[0046] like Figure 4 As shown, when the exhaust port 2321 is connected to the transition cylinder 6, the transition cylinder 6 has a vertical axis and includes an integrally formed connecting cylinder body 61, a first flange 62, and a second flange 63. The first flange 62 and the second flange 63 extend to both ends of the connecting cylinder body 61, and their diameters are both larger than the diameter of the connecting cylinder body 61. The first flange 62 extends to the bottom of the connecting cylinder body 61 and engages with the mounting groove 2323. The bottom of the first flange 62 extends downward to form a snap-fit ​​flange 621 that mates with the snap-fit ​​hole 2322. The second flange 63 extends to the top of the connecting cylinder body 61 and is fixed to the vacuum pressing device 4 by bolts. The top center of the second flange 63 also has a clearance groove 631 that mates with the vacuum pressing device 4. By connecting the transition cylinder 6 to the exhaust main cylinder 232 and the vacuum pressing device 4, the direct insertion of the vacuum pressing device 4 is avoided, the structural strength of the connection is increased, the service life of the exhaust main cylinder 232 is extended, and partial replacement is possible during replacement, reducing maintenance costs.

[0047] like Figure 4 As shown, the blind flange 7 has a vertical axis and includes an integrally formed mounting plate 71 and a plug 72. The outer diameter of the mounting plate 71 corresponds to the inner diameter of the mounting groove 2323 and is fixed to the mounting groove 2323 by bolts. The diameter of the plug 72 corresponds to the diameter of the vent hole 2321. A snap-fit ​​block 73 extends between the mounting plate 71 and the plug 72, and the diameter of the snap-fit ​​block 73 corresponds to the snap-fit ​​hole 2322. When a single vent is selected, one of the vent holes 2321 is blocked by the blind flange 7 to prevent material leakage or oxidation of the adhesive upon contact with air. The snap-fit ​​block 73 facilitates the engagement of the blind flange 7 and forms a stepped structure, increasing the air travel and providing a certain degree of sealing, allowing gas to be discharged from the single vent hole 2321.

[0048] like Figure 1 and Figure 5 As shown, the extruder barrel 24 includes a buffer barrel 241, a secondary pin barrel 242, and an extrusion barrel 243 connected in sequence. The buffer barrel 241 is connected to the exhaust barrel 23. The extrusion barrel 243 has an extrusion port at one end away from the secondary pin barrel 242. Two vertically arranged heat-insulating pipes 2411 are arranged in an array along the axial direction of the extrusion section 34 at the bottom of the buffer barrel 241. A heat-insulating groove 2412 is provided in the inner ring of the buffer barrel 241 and communicates with the heat-insulating pipes 2411. Two vertically arranged slow-cooling pipes 2421 are arranged in an array along the axial direction of the extrusion section 34 at the bottom of the secondary pin barrel 242. A slow-cooling groove 2422 is provided in the inner ring of the secondary pin barrel 242 and communicates with the slow-cooling pipes 2421. Two vertically arranged forced-cooling pipes 2431 are arranged in an array along the axial direction of the extrusion section 34 at the bottom of the extrusion barrel 243. A forced-cooling groove 2432 is provided in the inner ring of the extrusion barrel 243 and communicates with the forced-cooling pipes 2431. The extrusion section 34 controls the overall extrusion temperature of the rubber compound and improves the performance of the reclaimed rubber by setting up the buffer cylinder 241, the secondary pin cylinder 242 and the extrusion cylinder 243.

[0049] The working principle and usage of this screw extruder with venting structure are as follows: After crushing and magnetic separation, the rubber particles are fed into the screw extrusion unit 1 through the feed port 2111 for stirring, desulfurization, and extrusion. The rubber compound is first pre-mixed and stirred in the feeding section 31 and then fed into the desulfurization section 32 for continuous desulfurization. Then, it is vented and deodorized in the venting section 33. Finally, it is extruded into sheets by the extrusion section 34, completing the overall desulfurization of the rubber compound and obtaining recycled rubber compound. During this process, the feeding barrel 21 is heated and stirred, the desulfurization barrel 22 is cooled by heat exchange, the venting barrel 23 is insulated before and after it, and the extrusion barrel 24 is forcibly cooled. The local temperature can be adjusted to adapt to the production process. The venting barrel 23 is connected to the vacuum pressing device 4 through the transition cylinder 6. The unsuitable venting port 2321 is sealed by the blind plate 7.

[0050] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A screw extruder with a venting structure, comprising a screw extrusion device (1), a drive device (5), and a vacuum pressing device (4), wherein the drive device (5) is disposed at one end of the screw extrusion device (1) and controls the movement of the screw extrusion device (1), a feeding port (2111) is provided above the end of the screw extrusion device (1) near the drive device (5), and the vacuum pressing device (4) is disposed near the middle of the screw extrusion device (1), characterized in that, The screw extrusion device (1) includes a device cylinder (2) and an extrusion screw (3). The extrusion screw (3) is rotatably mounted inside the device cylinder (2) and is controlled to rotate by a drive device (5). The extrusion screw (3) includes a feeding section (31), a desulfurization section (32), an exhaust section (33), and an extrusion section (34) connected in sequence. The device cylinder (2) is provided with a feeder cylinder (21), a desulfurization cylinder (32), an exhaust section (33), and an extrusion section (34) respectively. The extruder consists of a cylinder (22), an exhaust cylinder (23), and an extruder cylinder (24). The feeder cylinder (21) is provided with a feed port (2111). The exhaust cylinder (23) has two exhaust holes (2321). The exhaust holes (2321) are connected to the vacuum pressing device (4) or to the blind plate (7). The exhaust holes (2321) are connected to the vacuum pressing device (4) through a transition cylinder (6). The transition cylinder (6) or the blind plate (7) is fixed to the exhaust cylinder (23) with bolts.

2. The screw extruder with a venting structure according to claim 1, characterized in that, The exhaust cylinder (23) is provided with a slowing cylinder (231) and an exhaust main cylinder (232) connected in sequence. The slowing cylinder (231) and the exhaust main cylinder (232) are connected and fixed by flanges. The slowing cylinder (231) is also connected and fixed to the desulfurization cylinder (22), and the exhaust main cylinder (232) is connected and fixed to the extruder cylinder (24) by flanges. Two water exchange pipes (2311) are arranged in an axial array at the bottom of the slowing cylinder (231). The axis of the water exchange pipes (2311) is perpendicular to the axis of the slowing cylinder (231). The slowing cylinder (231) is also surrounded by a water exchange trough (2312) that is connected to both water exchange pipes (2311).

3. A screw extruder with a venting structure according to claim 2, characterized in that, The top outer wall of the exhaust main cylinder (232) is provided with two exhaust holes (2321) arranged in an axial array. The axis of the exhaust holes (2321) is perpendicular to the axis of the exhaust main cylinder (232). The top of the exhaust holes (2321) extends a snap-fit ​​hole (2322) with a diameter larger than that of the exhaust holes (2321). The top of the snap-fit ​​hole (2322) also extends a mounting groove (2323) with a diameter larger than that of the snap-fit ​​hole (2322). A transition cylinder (6) or a blind plate (7) is installed in the mounting groove (2323).

4. A screw extruder with a venting structure according to claim 3, characterized in that, The transition cylinder (6) has a vertical axis and includes an integrally formed connecting cylinder (61), a first flange (62), and a second flange (63). The first flange (62) and the second flange (63) extend to both ends of the connecting cylinder (61) and their diameters are both larger than the diameter of the connecting cylinder (61). The first flange (62) extends to the bottom of the connecting cylinder (61) and engages with the mounting groove (2323). The bottom of the first flange (62) extends downward to form a snap-fit ​​flange (621) that engages with the snap-fit ​​hole (2322). The second flange (63) extends to the top of the connecting cylinder (61) and is fixed to the vacuum pressing device (4) by bolts. The center of the top of the second flange (63) is also provided with a clearance groove (631) that engages with the vacuum pressing device (4).

5. A screw extruder with a venting structure according to claim 3, characterized in that, The blind plate (7) has a vertical axis and includes an integrally formed mounting plate (71) and a plug (72). The outer diameter of the mounting plate (71) corresponds to the inner diameter of the mounting groove (2323) and is fixed to the mounting groove (2323) by bolts. The diameter of the plug (72) corresponds to the diameter of the vent hole (2321). A snap-fit ​​block (73) extends between the mounting plate (71) and the plug (72). The diameter of the snap-fit ​​block (73) corresponds to the snap-fit ​​hole (2322).

6. A screw extruder with a venting structure according to claim 1, characterized in that, The feeding cylinder (21) includes a first feeding cylinder (211) and a second feeding cylinder (212). The first feeding cylinder (211) and the second feeding cylinder (212) are connected by a flange, and the second feeding cylinder (212) is also connected to the desulfurization cylinder (22) by a flange. A feeding port (2111) is provided above one end of the first feeding cylinder (211), and a feeding pipe (2112) extends from the feeding port (2111). The bottom of both the feeder cylinder (211) and the second feeder cylinder (212) is arranged with two heating pipes (213) in an axial array. The heating pipes (213) are arranged vertically and perpendicular to the axial direction of the feeding section (31). The bottom of the first feeder cylinder (211) is provided with an arc-shaped heating groove (214) that communicates with the corresponding heating pipe (213). The inner ring of the second feeder cylinder (212) is provided with a heating groove (214) that communicates with the corresponding heating pipe (213).

7. A screw extruder with a venting structure according to claim 6, characterized in that, The desulfurization barrel (22) includes at least four pin barrels (221) connected in sequence. The pin barrels (221) at both ends are connected to the second feeder barrel (212) and the exhaust barrel (23) respectively. Each pin barrel (221) has two heat exchange tubes (2211) arranged in an array along the axial direction of the desulfurization section (32) at its bottom. The axis of the heat exchange tubes (2211) is vertical and perpendicular to the axial direction of the desulfurization section (32). The inner ring of the pin barrel (221) is provided with a heat exchange groove (2212) that is connected to both heat exchange tubes (2211).

8. A screw extruder with a venting structure according to claim 7, characterized in that, The extruder barrel (24) includes a buffer barrel (241), a secondary pin barrel (242), and an extruder barrel (243) connected in sequence. The buffer barrel (241) is connected to the exhaust barrel (23). The end of the extruder barrel (243) away from the secondary pin barrel (242) has an extrusion port. Two vertically arranged heat-insulating pipes (2411) are arranged in an array along the axial direction of the extrusion section (34) at the bottom of the buffer barrel (241). The inner ring of the buffer barrel (241) is provided with a heat-insulating groove (2412) and a heat-insulating pipe (2411). 411) Connected, the bottom of the secondary pin cylinder (242) is arranged with two vertically arranged slow cooling pipes (2421) along the axial direction of the extrusion section (34), the inner ring of the secondary pin cylinder (242) is provided with a slow cooling groove (2422) and connected with the slow cooling pipes (2421), the bottom of the extrusion cylinder (243) is arranged with two vertically arranged forced cooling pipes (2431) along the axial direction of the extrusion section (34), the inner ring of the extrusion cylinder (243) is provided with a forced cooling groove (2432) and connected with the forced cooling pipes (2431).

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