Two-stage plasticizing system for butyl reclaimed rubber

Abstract

The invention belongs to the technical field of butyl reclaimed rubber production equipment, and particularly relates to a butyl reclaimed rubber two-stage plasticizing system which comprises a pre-plasticizing assembly and a main plasticizing assembly which are communicated with each other through a transition conveying assembly. Through the design of arc-shaped protrusions and flow guide holes in the pre-plasticizing assembly, the uniformity of material pre-plasticizing is remarkably improved, an elastic stirring piece and a spiral conveying blade in the transition conveying assembly are matched, smooth conveying of materials is guaranteed, accumulation and blockage are prevented, excessive degradation of the materials is avoided, and the performance of the materials is guaranteed; the main plasticizing assembly improves plasticizing efficiency and material quality stability, reduces energy consumption, meets the production requirements of energy conservation and environmental protection, and further ensures stable operation and product quality of the system through independent temperature control of a pre-plasticizing cylinder heating sleeve, arrangement of a polytetrafluoroethylene coating and a heat preservation layer of a conveying pipe and arrangement of a filtering assembly. And the produced butyl reclaimed rubber can meet the high-quality requirement.

Description

Technical Field

[0001] This invention relates to the field of butyl reclaimed rubber production equipment technology, specifically a two-stage plasticizing system for butyl reclaimed rubber. Background Technology

[0002] Butyl reclaimed rubber, due to its excellent properties, is widely used in various industrial fields. The plasticizing process, as a key step in the production of butyl reclaimed rubber, directly affects the quality of the final product. Currently, the industry mostly uses a two-stage plasticizing process to process butyl reclaimed rubber. This process first uses a pre-plasticizing component to perform preliminary processing of the material, and then a main plasticizing component performs deep plasticizing.

[0003] However, existing two-stage plasticizing systems have many problems. In the pre-plasticizing stage, due to design flaws in the component structure, uneven plasticization often occurs, with some materials being over-plasticized while others are under-plasticized, severely impacting subsequent processes. Material transport between the pre-plasticizing and main plasticizing components is also unsmooth, easily accumulating and even clogging during transport, leading to production interruptions and reduced efficiency. The efficiency of the main plasticizing component also needs improvement; it not only consumes a lot of energy but also produces material with poor quality stability after plasticization, failing to meet the production requirements of high-quality butyl reclaimed rubber. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a two-stage plasticizing system for butyl reclaimed rubber, which improves the plasticizing quality and production efficiency of butyl reclaimed rubber, reduces energy consumption, and solves the problems of uneven plasticizing, poor material conveying, low plasticizing efficiency, and high energy consumption.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0008] A two-stage plasticizing system for butyl reclaimed rubber includes a pre-plasticizing component, a transition conveying component, and a main plasticizing component connected in sequence. The pre-plasticizing component includes a pre-plasticizing cylinder with a pre-plasticizing screw inside. Several sets of protrusions are evenly distributed along the axial direction on the inner wall of the pre-plasticizing cylinder. Each set of protrusions includes three arc-shaped protrusions arranged in a ring array. The height of the arc-shaped protrusions gradually increases along the rotation direction of the pre-plasticizing screw.

[0009] The raised structure can work in conjunction with the pre-plasticizing screw to compress and shear the material, thereby improving the plasticization uniformity of the material. At the same time, the gradual increase in the height of the arc-shaped protrusions can gradually increase the force on the material during the conveying process, avoiding the material from being subjected to excessive force in the early stage of pre-plasticization and thus over-plasticizing.

[0010] The pre-plasticized screw has several through-holes on its screw ridges. The through-holes are inclined along the height of the screw ridges, and the inclination direction of the through-holes is opposite to the rotation direction of the pre-plasticized screw.

[0011] The design of the guide holes allows some material to flow through the guide holes to the other side of the screw channel under the squeezing action of the screw ribs, thereby increasing the mixing effect of the material and further improving the plasticization uniformity.

[0012] Furthermore, a heating jacket is provided on the outside of the pre-plasticizing cylinder. The heating jacket is divided into several independent heating zones, and each heating zone is equipped with a temperature sensor and an independent temperature control unit.

[0013] The temperature of each area of ​​the preplasticizing cylinder can be precisely controlled according to the needs of different stages in the preplasticizing process, so as to ensure the temperature stability of the material during the preplasticizing process and improve the plasticizing effect.

[0014] The pre-plasticizing cylinder is equipped with a feeding hopper at its inlet end, which facilitates the smooth addition of raw materials into the pre-plasticizing cylinder, thereby enabling smooth subsequent processing.

[0015] The pre-plasticizing screw is connected to the output shaft of the first servo motor to ensure stable driving of the pre-plasticizing screw to rotate inside the pre-plasticizing cylinder, thereby completing the material conveying and plasticizing process.

[0016] Furthermore, the transition conveying assembly includes a conveying pipe, one end of which is connected to the outlet of the pre-plasticizing cylinder, and the other end of which is connected to the inlet of the main plasticizing assembly.

[0017] The conveying pipe is equipped with a spiral conveying blade, and several elastic stirring elements are sleeved on the axial direction of the spiral conveying blade;

[0018] The elastic stirring component includes a collar and elastic stirring rods evenly distributed on the outside of the collar, with a spherical stirring head provided at the end of the elastic stirring rods away from the collar;

[0019] The spiral conveyor blades enable stable material transport, while the elastic agitator rotates under the drive of the spiral conveyor blades to agitate the material and prevent it from clumping during transport. At the same time, the spherical agitator head reduces the shearing effect on the material and avoids excessive degradation of the material.

[0020] The inner wall of the conveying pipe is coated with a polytetrafluoroethylene coating. Polytetrafluoroethylene has good non-stick properties, which can reduce the adhesion of materials to the inner wall of the conveying pipe and prevent material accumulation and blockage. The outer side of the conveying pipe is equipped with a heat insulation layer, which can reduce heat loss during the conveying process and ensure the temperature stability of the material.

[0021] The spiral conveying blade and the elastic agitator are both fixedly connected to the drive shaft. One end of the drive shaft is connected to the output shaft of the second servo motor to ensure that the spiral conveying blade and the elastic agitator are stably installed in the conveying pipe, ensuring stable drive of the spiral conveying blade and the elastic agitator to rotate in the conveying pipe, completing the material conveying, and avoiding material blockage during the conveying process.

[0022] Furthermore, the main plasticizing component includes a main plasticizing cylinder, and a main plasticizing screw is disposed inside the main plasticizing cylinder. The main plasticizing screw includes a feeding section, a compression section and a homogenization section connected in sequence.

[0023] The pitch of the compression section gradually decreases along the material conveying direction, and several grooves are provided on the screw edge of the compression section, with wear-resistant alloy blocks embedded in the grooves.

[0024] The gradual reduction in the pitch of the compression section allows for further compression and shearing of the material, improving the plasticizing effect. The addition of wear-resistant alloy blocks enhances the wear resistance of the screw threads and extends the service life of the main plasticizing screw.

[0025] The screw surface of the homogenization section is provided with a spiral guide groove, and the depth of the guide groove gradually decreases along the material conveying direction.

[0026] The guide channel can guide the material to flow evenly in the homogenization section, so that the material is fully homogenized and the quality stability of the plasticized material is improved.

[0027] The inner wall of the main plasticizing cylinder is provided with several axially distributed turbulence protrusions, and a gap is formed between the turbulence protrusions and the screw edge of the main plasticizing screw. The size of the gap gradually decreases along the material conveying direction.

[0028] The turbulence protrusions can interfere with the flow of materials, increase the mixing effect of materials, and at the same time, the gradual reduction of the gap can gradually enhance the extrusion and shearing action on the materials, further improving the plasticizing efficiency.

[0029] The main plasticizing cylinder is equipped with a discharge hopper at the discharge port. A filter assembly is installed in the discharge hopper. The filter assembly includes a frame and a detachable filter screen. The mesh size of the filter screen is - mesh.

[0030] The filter assembly can filter out impurities and incompletely plasticized particles from the plasticized material, thereby improving the quality of butyl reclaimed rubber.

[0031] The main plasticizing screw is connected to the output shaft of the third servo motor to ensure stable drive of the main plasticizing screw to rotate inside the main plasticizing cylinder, thereby completing the material conveying and plasticizing process.

[0032] (III) Beneficial Effects

[0033] Compared with the prior art, the present invention provides a two-stage plasticizing system for butyl reclaimed rubber, which has the following beneficial effects:

[0034] This invention significantly improves the uniformity of material pre-plasticization through the design of arc-shaped protrusions and guide holes in the pre-plasticization component, avoiding over-plasticization or under-plasticization and laying a good foundation for the subsequent main plasticization process. The elastic stirring element and spiral conveying blades in the transition conveying component work together to ensure smooth material conveying, prevent accumulation and blockage, and avoid excessive material degradation, thus ensuring material performance. The structural design of the main plasticization component, including the compression section, homogenization section, and turbulence protrusions, improves plasticization efficiency and material quality stability, reduces energy consumption, and meets the requirements of energy-saving and environmentally friendly production. The independent temperature control of the pre-plasticization cylinder heating jacket, the polytetrafluoroethylene coating and insulation layer of the conveying pipe, and the setting of the filter component further ensure the stable operation of the system and product quality, enabling the produced butyl reclaimed rubber to meet high-quality requirements. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the present invention;

[0036] Figure 2 This is a partial cross-sectional view of the pre-plasticized component in this invention;

[0037] Figure 3 This is a schematic diagram of the elastic stirring element in this invention;

[0038] Figure 4 This is a partial cross-sectional view of the transition conveying component in this invention;

[0039] Figure 5 This is a partial cross-sectional view of the main plasticizing component in this invention.

[0040] In the diagram: 1. Pre-plasticizing component; 101. Pre-plasticizing cylinder; 102. Pre-plasticizing screw; 103. Protruding structure; 104. Guide hole; 105. Heating jacket; 106. First servo motor; 107. Feed hopper; 2. Transition conveying component; 201. Conveying pipe; 202. Spiral conveying blade; 203. Elastic stirring component; 2031. Collar; 2032. Elastic stirring rod; 2033. Spherical stirring head; 204. Insulation layer; 205. Drive shaft; 206. Second servo motor; 3. Main plasticizing component; 301. Main plasticizing cylinder; 302. Main plasticizing screw; 303. Feeding section; 304. Compression section; 305. Homogenization section; 306. Guide groove; 307. Turbulence protrusion; 308. Discharge hopper; 309. Filter; 310. Third servo motor. Detailed Implementation

[0041] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example

[0043] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an embodiment of the present invention proposes a two-stage plasticizing system for butyl reclaimed rubber, comprising a pre-plasticizing component 1, a transition conveying component 2, and a main plasticizing component 3 connected in sequence. The pre-plasticizing component 1 includes a pre-plasticizing cylinder 101, a pre-plasticizing screw 102 disposed inside the pre-plasticizing cylinder 101, and several sets of protrusion structures 103 uniformly distributed along the axial direction on the inner wall of the pre-plasticizing cylinder 101. Each set of protrusion structures 103 includes three arc-shaped protrusions arranged in a ring array, and the height of the arc-shaped protrusions gradually increases along the rotation direction of the pre-plasticizing screw 102.

[0044] The raised structure 103 can cooperate with the pre-plasticizing screw 102 to form a squeezing and shearing effect on the material, thereby improving the plasticization uniformity of the material. At the same time, the gradual increase in the height of the arc-shaped protrusion can gradually increase the force on the material during the conveying process, avoiding the material being subjected to excessive force in the early stage of pre-plasticization and thus avoiding over-plasticization. It can also ensure that the material is fully plasticized and improve the plasticization uniformity.

[0045] The pre-plasticized screw 102 has several through guide holes 104 on its screw edge. The guide holes 104 are inclined along the height direction of the screw edge, and the inclination direction of the guide holes 104 is opposite to the rotation direction of the pre-plasticized screw 102.

[0046] When the preplasticizing screw 102 rotates, some material will flow to the other side of the screw channel through the guide hole 104 under the squeezing action of the screw edge, which increases the mixing effect of the material and further improves the uniformity of preplasticization.

[0047] The pre-plasticizing cylinder 101 is provided with a heating jacket 105 on its outside. The heating jacket 105 is divided into several independent heating zones, and each heating zone is provided with a temperature sensor and an independent temperature control unit.

[0048] The temperature of each area of ​​the preplasticizing cylinder 101 can be precisely controlled according to the temperature requirements of different stages in the preplasticizing process, so as to ensure that the material is preplasticized in a suitable temperature environment and to guarantee the preplasticizing effect.

[0049] The feed end of the pre-plasticizing cylinder 101 is equipped with a feed hopper 107, which facilitates the smooth addition of raw materials into the pre-plasticizing cylinder 101, thereby enabling smooth subsequent processing.

[0050] The pre-plasticizing screw 102 is connected to the output shaft of the first servo motor 106 to ensure stable driving of the pre-plasticizing screw 102 to rotate inside the pre-plasticizing cylinder 101, thereby completing the material conveying and plasticizing process.

[0051] The transition conveying assembly 2 includes a conveying pipe 201, one end of which is connected to the outlet of the pre-plasticizing cylinder 101, and the other end is connected to the inlet of the main plasticizing assembly 3.

[0052] A spiral conveying blade 202 is provided inside the conveying pipe 201, and several elastic stirring elements 203 are sleeved on the axial side of the spiral conveying blade 202.

[0053] The elastic stirring component 203 includes a collar 2031 and elastic stirring rods 2032 evenly distributed on the outside of the collar. A spherical stirring head 2033 is provided at the end of the elastic stirring rod 2032 away from the collar.

[0054] During the rotation of the spiral conveyor blade 202, the elastic agitator 203 rotates accordingly to agitate the material and prevent it from clumping during the conveying process. The spherical agitator head 2033 can reduce the shearing effect on the material and avoid excessive degradation of the material.

[0055] The inner wall of the conveying pipe 201 is coated with a polytetrafluoroethylene coating. Polytetrafluoroethylene has good non-stick properties, which can reduce the adhesion of materials on the inner wall of the conveying pipe 201 and prevent material accumulation and blockage. The outer side of the conveying pipe 201 is provided with a heat insulation layer 205, which can reduce heat loss during the conveying process, ensure the temperature stability of the material, and facilitate the smooth progress of the subsequent main plasticizing process.

[0056] Both the spiral conveyor blade 202 and the elastic agitator 203 are fixedly connected to the drive shaft 205. One end of the drive shaft 205 is connected to the output shaft of the second servo motor 206 to ensure that the spiral conveyor blade 202 and the elastic agitator 203 are stably installed in the conveying pipe 201. This ensures that the spiral conveyor blade 202 and the elastic agitator 203 are stably driven to rotate in the conveying pipe 201 to complete the material conveying and avoid material blockage during the conveying process.

[0057] The main plasticizing component 3 includes a main plasticizing cylinder 301, and a main plasticizing screw 302 is provided inside the main plasticizing cylinder 301. The main plasticizing screw 302 includes a feeding section 303, a compression section 304 and a homogenization section 305 connected in sequence.

[0058] The pitch of the compression section 304 gradually decreases along the material conveying direction, which can further compress and shear the material, enhance the plasticizing effect, and the screw edge of the compression section 304 is provided with several grooves, in which wear-resistant alloy blocks are embedded, which can improve the wear resistance of the screw edge and extend the service life of the main plasticizing screw 302.

[0059] The gradual reduction in the pitch of the compression section 304 allows for further compression and shearing of the material, improving the plasticizing effect. The wear-resistant alloy block enhances the wear resistance of the screw threads and extends the service life of the main plasticizing screw 302.

[0060] The screw surface of the homogenization section 305 is provided with a spiral guide groove 306, and the depth of the guide groove 306 gradually decreases along the material conveying direction.

[0061] The guide channel 306 can guide the material to flow evenly in the homogenization section 305, so that the material is fully homogenized and the quality stability of the plasticized material is improved.

[0062] The inner wall of the main plasticizing cylinder 301 is provided with several axially distributed turbulence protrusions 307. A gap is formed between the turbulence protrusions 307 and the screw edge of the main plasticizing screw 301. The size of the gap gradually decreases along the material conveying direction.

[0063] The 307 turbulence protrusions can interfere with the flow of materials, increase the mixing effect of materials, and at the same time, the gradual reduction of the gap can gradually enhance the extrusion and shearing action on the materials, further improving the plasticizing efficiency.

[0064] A discharge hopper 308 is installed at the discharge port of the main plasticizing cylinder 301. A filter assembly 309 is installed in the discharge hopper 308. The filter assembly 309 includes a frame and a detachable filter screen. The mesh size of the filter screen is 80-120 mesh. The filter assembly 309 can filter out impurities and incompletely plasticized particles in the plasticized material, thereby improving the quality of butyl recycled rubber.

[0065] The filter assembly 309 can filter out impurities and incompletely plasticized particles in the plasticized material, thereby improving the quality of butyl reclaimed rubber.

[0066] The main plasticizing screw 301 is connected to the output shaft of the third servo motor 310 to ensure stable drive of the main plasticizing screw 301 to rotate inside the main plasticizing cylinder 301, thereby completing the material conveying and plasticizing process.

[0067] During operation, butyl recycled rubber material is first added to the preplasticizing cylinder 101 of the preplasticizing component 1 through the feed hopper 107;

[0068] The first servo motor 106 drives the pre-plasticizing screw 102 to rotate, which in turn conveys the material forward. The arc-shaped protrusions on the inner wall of the pre-plasticizing cylinder 101 cooperate with the pre-plasticizing screw 102 to squeeze and shear the material. At the same time, the heating jacket 105 heats the material in the pre-plasticizing cylinder 101 to achieve pre-plasticization. During the pre-plasticization process, some material flows through the guide holes 104 on the screw thread, which improves the uniformity of pre-plasticization.

[0069] The pre-plasticized material enters the transition conveying assembly 2. The second servo motor 206 drives the spiral conveying blade 202 and the elastic stirring element 203 to rotate in the conveying pipe 201. The spiral conveying blade 202 conveys the material forward, and the elastic stirring element 203 stirs the material to prevent agglomeration. The polytetrafluoroethylene coating of the conveying pipe 201 reduces material adhesion, and the insulation layer 204 ensures the material temperature.

[0070] The material then enters the main plasticizing cylinder 301 of the main plasticizing component 3. Under the action of the third servo motor 310, the main plasticizing screw 302 passes through the feeding section 303 and enters the compression section. The gradually decreasing screw pitch in the compression section 304 further compresses and shears the material, enhancing the plasticizing effect. After that, the material enters the homogenization section 305 and flows evenly under the guidance of the guide channel 306, achieving full homogenization. The turbulence protrusions 307 on the inner wall of the main plasticizing cylinder 301 further enhance the mixing effect of the material and improve the plasticizing efficiency. Finally, the plasticized material is filtered by the filter air 309 in the discharge hopper 308 to remove impurities and incompletely plasticized particles, resulting in high-quality butyl reclaimed rubber.

[0071] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-stage plasticizing system for butyl reclaimed rubber, comprising a pre-plasticizing component (1), a transition conveying component (2), and a main plasticizing component (3) connected in sequence, characterized in that: The pre-plasticizing component (1) includes a pre-plasticizing cylinder (101), a pre-plasticizing screw (102) is provided inside the pre-plasticizing cylinder (101), and a number of sets of protruding structures (103) are evenly distributed along the axial direction on the inner wall of the pre-plasticizing cylinder (101). Each set of protruding structures (103) includes three arc-shaped protrusions arranged in a ring array. The height of the arc-shaped protrusions gradually increases along the rotation direction of the pre-plasticizing screw (102). The pre-plasticized screw (102) has several through-holes (104) on its screw edge. The through-holes (104) are inclined along the height direction of the screw edge, and the inclination direction of the through-holes (104) is opposite to the rotation direction of the pre-plasticized screw (102).

2. The two-stage plasticizing system for butyl reclaimed rubber according to claim 1, characterized in that: The pre-plasticizing cylinder (101) is provided with a heating jacket (105) on the outside. The heating jacket (105) is divided into several independent heating areas. Each heating area is provided with a temperature sensor and an independent temperature control unit. The pre-plasticizing cylinder (101) is provided with a feeding hopper (107) at its feeding end; The pre-plasticized screw (102) is connected to the output shaft of the first servo motor (106) via a transmission connection.

3. The two-stage plasticizing system for butyl reclaimed rubber according to claim 1, characterized in that: The transition conveying assembly (2) includes a conveying pipe (201), one end of which is connected to the outlet of the pre-plasticizing cylinder (101), and the other end is connected to the inlet of the main plasticizing assembly (3). The conveying pipe (201) is provided with a spiral conveying blade (202), and a number of elastic stirring elements (203) are sleeved on the axial direction of the spiral conveying blade (202); The elastic stirring component (203) includes a collar (2031) and elastic stirring rods (2032) evenly distributed on the outside of the collar. A spherical stirring head (2033) is provided at the end of the elastic stirring rod (2032) away from the collar.

4. The two-stage plasticizing system for butyl reclaimed rubber according to claim 3, characterized in that, The inner wall of the conveying pipe (201) is coated with polytetrafluoroethylene, and the outer side of the conveying pipe (201) is provided with a heat insulation layer (205). The spiral conveyor blade (202) and the elastic stirring element (203) are both fixedly connected to the drive shaft (205), and one end of the drive shaft (205) is connected to the output shaft of the second servo motor (206).

5. The two-stage plasticizing system for butyl reclaimed rubber according to claim 1, characterized in that: The main plasticizing component (3) includes a main plasticizing cylinder (301), and a main plasticizing screw (302) is provided inside the main plasticizing cylinder (301). The main plasticizing screw (302) includes a feeding section (303), a compression section (304) and a homogenization section (305) connected in sequence. The pitch of the compression section (304) gradually decreases along the material conveying direction, and several grooves are provided on the screw edge of the compression section (304), with wear-resistant alloy blocks embedded in the grooves; The screw surface of the homogenization section (305) is provided with a spiral guide groove (306), and the depth of the guide groove (306) gradually decreases along the material conveying direction.

6. The two-stage plasticizing system for butyl reclaimed rubber according to claim 5, characterized in that: The inner wall of the main plasticizing cylinder (301) is provided with a number of axially distributed turbulence protrusions (307), and a gap is formed between the turbulence protrusions (307) and the screw edge of the main plasticizing screw (301). The size of the gap gradually decreases along the material conveying direction.

7. The two-stage plasticizing system for butyl reclaimed rubber according to claim 5, characterized in that: The main plasticizing cylinder (301) has a discharge hopper (308) installed at the discharge port. A filter assembly (309) is installed in the discharge hopper (308). The filter assembly (309) includes a frame and a detachable filter screen with a mesh size of 80-120.

8. The two-stage plasticizing system for butyl reclaimed rubber according to claim 5, characterized in that: The main plasticizing screw (301) is connected to the output shaft of the third servo motor (310) via a transmission connection.

Images