Anti-blocking discharging structure for waste tire regenerated rubber production

Abstract

The invention relates to the technical field of regenerated rubber production and discharging, in particular to an anti-blocking discharging structure for waste tire regenerated rubber production. A motor drives a speed reducer to drive a main shaft to rotate, the main shaft is provided with a gradually-deepened sliding groove and a disc spring reset mechanism to be in linkage with a blade assembly, when the material pressure is larger than 0.2 MPa, a sliding rod slides along the sliding groove with the inclination angle ranging from 15 degrees to 45 degrees, and blades are driven to move inwards in the radial direction to form a dynamic gap with the maximum 8 mm; the hardened materials are subjected to secondary crushing in cooperation with a shearing rod assembly vertically arranged on the surface of the lining plate; the structure breaks through the limitation of a traditional fixed gap, the volume of the pressure relief cavity is instantaneously enlarged by 30%, and the blocking rate is reduced by 90%; automatic reset is guaranteed through 500-800 N pre-pressure of the disc springs, the service life of the device is longer than 8000 hours through cooperation of the disc springs and the ceramic wear-resisting lining plates, and the problem that the spiral conveyor is shut down frequently due to material hardening is solved.

Description

Technical Field

[0001] This invention relates to the field of recycled rubber production discharge technology, and in particular to an anti-clogging discharge structure for recycled rubber production from waste tires. Background Technology

[0002] The anti-clogging discharge structure in the waste tire recycled rubber production line is a key conveying device, responsible for continuously conveying the crushed granular rubber powder and additive mixture to the extruder.

[0003] During the spiral conveying of recycled rubber, the rubber powder particles are continuously compressed and compacted under the action of axial propulsion force. When the material is mixed with additives such as zinc stearate, its fluidity decreases sharply. Field tests show that for every rotation of the spiral blade, the material density in front of the blade increases by 15%, and after 2 hours of operation, the local pressure can reach 0.25 MPa. At this time, the rubber powder particles harden into cement-like blocks at the gap between the blade and the cylinder wall, blocking the flow channel. Operators have to frequently stop the machine and use pneumatic picks to chisel the outer wall of the cylinder to shake off the material arch. A single unblocking takes more than 40 minutes, resulting in a daily production capacity loss of 25%. Traditional anti-blocking solutions have fundamental defects: variable pitch spirals only delay the compaction process and cannot eliminate high-pressure caking; vibrators exacerbate material stratification and accelerate blockage; and external cutting blades are completely ineffective against deep compacted blocks. None of the existing solutions have solved the structural contradiction between fixed gap and dynamic compaction: the initially designed 1-2 mm gap can be conveyed normally under low pressure, but once the material pressure exceeds the critical value, this gap becomes the generation zone of the compaction core. This rigid structure lacks pressure self-adaptation capability, causing the conveyor to be trapped in a vicious cycle of "blockage-stoppage-unblocking" for a long time, which has become a technical bottleneck restricting the continuous production of recycled rubber.

[0004] Therefore, this application provides an anti-clogging discharge structure for the production of recycled rubber from waste tires to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-clogging discharge structure for the production of recycled rubber from waste tires, which solves the problems in the existing recycled rubber powder production process, where the spiral blades and the cylinder wall have a fixed gap, forming an unadjustable compaction core area under high material pressure, leading to flow channel caking and blockage, and frequent shutdowns for cleaning.

[0006] To solve the above-mentioned technical problems, the present invention provides an anti-clogging discharge structure for the production of recycled rubber from waste tires, including a motor. The output shaft of the motor is connected to the input end of a reducer via a coupling. The output end of the reducer is connected via a key to drive the main shaft to rotate. The main shaft is horizontally supported in the center hole of the end plate of the conveying cylinder by bearings at both ends. The main shaft horizontally passes through the central axis of the conveying cylinder. Several spirally arranged blade assemblies are arranged on the main shaft. The inner wall of the conveying cylinder is lined with a removable ceramic liner, and several spirally arranged shearing rod assemblies are arranged on the liner. The blade assembly includes a gradually deepening groove extending from the feed end to the discharge end on the outer surface of the main shaft. The gradually deepening groove forms an angle of 15°-45° with the axis of the main shaft. The bottom of the groove extends into the main shaft to form a cylindrical limiting groove. A disc spring is installed in the limiting groove, and the axis of the disc spring coincides with the axis of the main shaft. A sliding rod is embedded in the gradually deepening groove. The top of the sliding rod is welded to the inner edge of the blade, and the welding area covers one-third of the circumference of the inner edge of the blade. A circular shim is installed at the bottom of the sliding rod. The plane of the shim abuts against the end face of the disc spring and transmits the preload. The radius of the inner edge of the blade is 1.2-1.5 times the radius of the main shaft. The shear bar assembly includes a fixed base spirally arranged on the surface of the liner, and a shear bar is arranged on the fixed base with the axis of the shear bar perpendicular to the axis of the main shaft.

[0007] A further improvement of the technical solution of the present invention is that: the cross-section of the gradually deepening chute is a rectangular groove with a width of 25-35 mm and a depth of 0-8 mm; the depth of the chute increases linearly from the feed end to the discharge end.

[0008] A further improvement of the technical solution of the present invention is that: the diameter of the pad at the tail of the slide rod is equal to the outer diameter of the disc spring; the pre-compression of the disc spring is 30% of the free length, and provides a pre-pressure of 500N-800N under normal conditions.

[0009] A further improvement to the technical solution of the present invention is that the normal gap between the outer edge of the blade and the inner wall of the liner is 1-2 mm.

[0010] A further improvement of the technical solution of the present invention is that when the axial pressure of the material exceeds 0.2MPa, the slide bar slides along the gradually deepening groove to form a dynamic gap of up to 8 mm, and the dynamic gap area constitutes a temporary pressure relief chamber with increased volume.

[0011] A further improvement to the technical solution of the present invention is that the length of the shearing rod is 15% of the inner diameter of the liner plate and not more than 50 mm.

[0012] A further improvement of the technical solution of the present invention is that: a 60° conical horn-shaped feed inlet is welded to the top of the feed end of the conveying cylinder, and a straight cylindrical discharge outlet with a diameter increased by 20% is connected to the bottom of the discharge end, and the inner wall of the discharge outlet is lined with a ceramic wear-resistant layer.

[0013] A further improvement to the technical solution of the present invention is that: a rectangular inspection window is opened at the top of the conveying cylinder, the window covers two adjacent sets of shear rod assemblies, a silicone sealing strip is embedded on the edge of the inspection window flange, and a ceramic patch is welded to the inside of the window cover.

[0014] A further improvement of the technical solution of the present invention is that the conversion relationship between the axial displacement ΔL of the slide rod and the radial clearance ΔH of the blade satisfies ΔH=ΔL·tanθ, where θ is the angle between the asymptotic groove and the axis of the main shaft, and the value range is 15°-45°.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects: 1. This invention provides an anti-clogging discharge structure for waste tire recycled rubber production. This structure, through the coordinated design of a gradually deepening chute and a disc spring reset mechanism, achieves automatic displacement response of the blade assembly. When the axial pressure of the material exceeds 0.2 MPa, the slide bar slides along the 15°-45° inclined chute towards the main shaft axis, driving the blades to radially retract and form a maximum dynamic gap of 8 mm, instantly expanding the flow channel volume by 30%. This design breaks through the rigid constraints of traditional fixed gaps, providing a pressure relief channel for high-pressure compacted materials, fundamentally dismantling the core compaction generation mechanism, and reducing the clogging failure rate by more than 90%.

[0016] 2. This invention provides an anti-clogging discharge structure for the production of recycled rubber from waste tires. This structure constructs a double anti-clogging barrier through the combined action of a spirally arranged shearing rod assembly and a dynamic gap. Under normal conditions, the shearing rods and rotating blades maintain a 0.5 mm gap to continuously shear the nascent compacted material. When a temporary pressure relief chamber is formed, high-pressure material rushes into the chamber and is further crushed by the dense shearing rods. Compared to traditional external cutting blades, this design improves the crushing efficiency of deeply compacted blocks by 5 times, completely solving the problem of slab accumulation in front of the blades.

[0017] 3. This invention provides an anti-clogging discharge structure for waste tire recycled rubber production. This structure, through precise control of the pre-compression force of the disc spring (500N-800N), endows the system with self-recovery capability. After the blockage is cleared, the disc spring automatically pushes the slide bar to reset, precisely restoring the outer edge of the blades to a normal 1-2 mm gap, rebuilding the sealed conveying state without manual intervention. This feature eliminates the manual unclogging step, achieving automatic recovery within 30 seconds and increasing the production line operating rate to 98%.

[0018] 4. This invention provides an anti-clogging discharge structure for the production of recycled rubber from waste tires. This structure achieves precise displacement conversion through the geometric relationship between the linear increase in chute depth and the angle θ. Each millimeter change in chute depth corresponds to a specific radial clearance increment, ensuring that the blade displacement is strictly matched with the material pressure. This avoids both pressure relief failure due to insufficient clearance and material backflow caused by excessive clearance. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of an anti-clogging discharge structure for the production of recycled rubber from waste tires; Figure 2 for Figure 1 A schematic diagram of the overall structure from another angle; Figure 3 for Figure 1 The main view; Figure 4 for Figure 1 Top view; Figure 5 for Figure 4 An enlarged schematic diagram of part A in the middle; Figure 6 for Figure 1 A sectional view; Figure 7 for Figure 6 Enlarged schematic diagram of part B in the middle; Figure 8 This is a schematic diagram of the internal structure of the conveying cylinder of the present invention; Figure 9 for Figure 8 An enlarged schematic diagram of section C; Figure 10 This is a schematic diagram of the blade assembly of the present invention.

[0021] Reference numerals: 1. Motor; 2. Reducer; 3. Conveying cylinder; 31. Liner; 4. Feed inlet; 5. Discharge outlet; 6. Inspection window; 7. Main shaft; 8. Blade assembly; 81. Blade; 82. Slide rod; 83. Slide groove; 84. Shim; 85. Limiting groove; 86. Disc spring; 9. Shearing rod assembly; 91. Base; 92. Shearing rod. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The present invention will be further explained below with reference to specific embodiments.

[0026] like Figures 1-10 As shown, this embodiment provides an anti-clogging discharge structure for the production of recycled rubber from waste tires, including a motor 1. The output shaft of the motor 1 is connected to the input end of a reducer 2 via a coupling. The output end of the reducer 2 is connected via a key to drive the main shaft 7 to rotate. The main shaft 7 is horizontally supported in the center hole of the end plate of the conveying cylinder 3 by bearings at both ends. The main shaft 7 horizontally passes through the central axis of the conveying cylinder 3. Several spirally arranged blade assemblies 8 are arranged on the main shaft 7. The inner wall of the conveying cylinder 3 is covered with a removable ceramic liner 31. Several spirally arranged shearing rod assemblies 9 are arranged on the liner 31. like Figures 4-10As shown, in this embodiment, the blade assembly 8 includes a gradually deepening groove 83 extending from the feed end to the discharge end on the outer surface of the main shaft 7. The gradually deepening groove 83 forms an angle of 15°-45° with the axis of the main shaft 7. The cross-section of the gradually deepening groove 83 is a rectangular groove with a width of 25-35 mm and a depth of 0-8 mm. The depth of the groove 83 increases linearly from the feed end to the discharge end. The bottom of the groove 83 extends into the main shaft 7 to form a cylindrical limiting groove 85. A disc spring 86 is provided in the limiting groove 85, and the axis of the disc spring 86 coincides with the axis of the main shaft 7. A sliding rod 82 is embedded in the gradually deepening groove 83. The top of the sliding rod 82 is welded to the inner edge of the blade 81. The radius of the inner edge of the blade 81 is 1.2-1.5 times the radius of the main shaft 7. The welding area covers one-third of the circumference of the inner edge of the blade 81. The normal gap between the outer edge of the blade 81 and the inner wall of the liner 31 is 1-2 mm. A circular pad 84 is provided at the bottom of the slide rod 82. The plane of the pad 84 abuts against the end face of the disc spring 86 and transmits the preload. The diameter of the pad 84 at the tail of the slide rod 82 is equal to the outer diameter of the disc spring 86. The pre-compression of the disc spring 86 is 30% of its free length, providing a preload of 500N-800N under normal conditions, giving the system self-recovery capability. The coordinated design of the progressive groove 83 and the disc spring 86 reset mechanism realizes the automatic displacement response of the blade assembly 8. When the axial pressure of the material exceeds 0.2MPa, the slide rod 82 slides along the groove 83 with an inclination angle of 15°-45° toward the axis of the main shaft 7, driving the blade 81 to radially retract and form a maximum dynamic gap of 8 mm, instantly expanding the flow channel volume by 30%. This design breaks through the rigid constraint of the traditional fixed gap, allowing high-pressure caking materials to obtain a pressure relief channel, fundamentally dismantling the core compaction generation mechanism, and reducing the blockage failure rate by more than 90%. When the axial pressure of the material exceeds 0.2 MPa, the slide bar 82 slides along the progressively deeper groove 83 to form a dynamic gap of up to 8 mm. This dynamic gap region constitutes a temporary pressure relief chamber with increased volume. The conversion relationship between the axial displacement ΔL of the slide bar 82 and the radial clearance ΔH of the blade 81 satisfies ΔH = ΔL·tanθ, where θ is the angle between the progressively deeper groove 83 and the axis of the main shaft 7, ranging from 15° to 45°. The linear increase in the depth of the groove 83 and the geometric relationship with the angle θ achieve precise displacement conversion. Each millimeter change in the depth of the groove 83 corresponds to a specific radial clearance increment, ensuring that the displacement of the blade 81 is strictly matched with the material pressure. This avoids pressure relief failure due to insufficient clearance and material backflow caused by excessive clearance.

[0027] like Figures 5-7As shown, in this embodiment, the shearing rod assembly 9 includes a fixed base 91 spirally arranged on the surface of the liner 31, and a shearing rod 92 is arranged on the fixed base 91. The axis of the shearing rod 92 is perpendicular to the axis of the main shaft 7. The length of the shearing rod 92 is 15% of the inner diameter of the liner 31 and is not greater than 50 mm. After the blade (81) is retracted, the minimum gap between it and the shearing rod (92) is maintained at ≥3 mm to prevent motion interference. The cooperation between the shearing rod assembly 9 and the dynamic gap constructs a double anti-blocking barrier. Under normal conditions, the shearing rod 92 and the rotating blade 81 maintain a 0.5 mm gap to continuously shear the nascent bonded block; when a temporary pressure relief chamber is formed, the high-pressure material rushes into the chamber and is crushed a second time by the dense shearing rod 92. Compared with the traditional external cutting blade, this design improves the crushing efficiency of deep compacted blocks by 5 times and completely solves the problem of slab accumulation in front of the blade 81.

[0028] like Figures 1-5 As shown, in this embodiment, a 60° conical horn-shaped feed inlet 4 is welded to the top of the feed end of the conveying cylinder 3, and a straight cylindrical discharge outlet 5 with a diameter increased by 20% is connected to the bottom of the discharge end. The inner wall of the discharge outlet 5 is lined with a ceramic wear-resistant layer. A rectangular inspection window 6 is opened on the top of the conveying cylinder 3, which covers two adjacent sets of shear rod assemblies 9. A silicone sealing strip is embedded on the flange edge of the inspection window 6, and a ceramic patch is welded to the inside of the window cover.

[0029] This invention also provides the working principle of an anti-clogging discharge structure for the production of recycled rubber from waste tires: Motor 1 drives reducer 2 to transmit power through coupling, causing main shaft 7 to rotate inside conveying cylinder 3. The rubber powder mixture enters from 60° cone-shaped inlet 4 and falls onto the spirally arranged blade assembly 8. When blades 81 rotate with main shaft 7 to propel material, under normal conditions, the outer edge of blades 81 maintains a 1-2 mm gap with ceramic liner 31 for sealing and conveying. When the material pressure exceeds 0.2 MPa, causing a risk of caking, the high pressure pushes the slide rod 82 connected to the inner edge of blade 81 to slide along the gradually deepening groove 83 on the surface of main shaft 7: the bottom end of slide rod 82 compresses the disc spring 86 in the limiting groove 85, causing blade 81 to move radially inward to form a maximum dynamic gap of 8 mm; this gap instantly expands the flow channel volume, and the caking material rushes into the temporary pressure relief chamber, while being cut and crushed by the shearing rods 92 vertically set on liner 31. The shearing rods 92 are spirally distributed on the surface of liner 31 through base 91, and are staggered with the rotation trajectory of blades 81 to perform secondary crushing of lumpy material. After the blockage is cleared, the disc spring 86 releases its elastic potential energy, pushing the slide bar 82 to precisely reset the blade 81 to the initial gap. The processed adhesive powder is discharged through the outlet 5, which has a diameter increased by 20%, and its inner wall ceramic wear-resistant layer prevents material adhesion. During routine maintenance, the shearing rod assembly 9 can be quickly cleaned through the top inspection window 6, and the silicone sealing strip and ceramic patch ensure the integrity of the flow channel after the window is closed.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; 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 or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A clog-proof discharge structure for the production of recycled rubber from waste tires, characterized in that: The motor (1) output shaft is connected with the input end of the speed reducer (2) through a shaft coupling, the output end of the speed reducer (2) is connected with the driving spindle (7) through a key, the spindle (7) is horizontally supported in the center hole of the end plate of the conveying cylinder (3) through two end bearings, the spindle (7) horizontally penetrates the center axis of the conveying cylinder (3), and a plurality of spiral arranged blade assemblies (8) are arranged on the spindle (7); the inner wall of the conveying cylinder (3) is paved with a detachable ceramic lining plate (31), and a plurality of spiral arranged shear rod assemblies (9) are arranged on the lining plate (31); The blade assembly (8) comprises a gradually deepening sliding groove (83) which is formed in the outer surface of the spindle (7) and extends from the feeding end to the discharging end, the gradually deepening sliding groove (83) forms an angle of 15°-45° with the axis of the spindle (7), the bottom of the sliding groove (83) extends to the inside of the spindle (7) to form a cylindrical limiting groove (85), a disc spring (86) is arranged in the limiting groove (85), and the axis of the disc spring (86) coincides with the axis of the spindle (7); a sliding rod (82) is embedded in the gradually deepening sliding groove (83) and is arranged in cooperation with sliding, the top end of the sliding rod (82) is welded to the inner edge of a blade (81), the welding area covers one third of the circumference of the inner edge of the blade (81), a circular gasket (84) is arranged at the bottom end of the sliding rod (82), the plane of the gasket (84) is in close contact with the end face of the disc spring (86) and transmits pre-pressure, and the inner edge radius of the blade (81) is 1.2-1.5 times the radius of the spindle (7). The shear rod assembly (9) comprises a fixed base body (91) which is spirally arranged on the surface of the lining plate (31), and a shear rod (92) is arranged on the fixed base body (91), and the axis of the shear rod (92) is perpendicular to the axis of the spindle (7).

2. The anti-blocking discharge structure for producing waste tire regenerated rubber according to claim 1, characterized in that: The gradually deepening sliding groove (83) is a rectangular groove with a width of 25-35 mm and a depth of 0-8 mm; the depth of the sliding groove (83) increases linearly from the feeding end to the discharging end.

3. The anti-blocking discharge structure for producing waste tire regenerated rubber according to claim 1, characterized in that: The diameter of the tail gasket (84) of the sliding rod (82) is equal to the outer diameter of the disc spring (86); the pre-compression amount of the disc spring (86) is 30% of the free length, and the disc spring (86) provides a pre-pressure of 500N-800N under normal conditions.

4. The anti-blocking discharge structure for producing waste tire regenerated rubber according to claim 1, characterized in that: The gap between the outer edge of the blade (81) and the inner wall of the lining plate (31) is 1-2 mm under normal conditions.

5. The anti-blocking discharge structure for producing waste tire regenerated rubber according to claim 1, characterized in that: When the axial pressure of the material exceeds 0.2MPa, the sliding rod (82) slides along the gradually deepening sliding groove (83) to form a maximum dynamic gap of 8 mm, and the dynamic gap area forms a temporary pressure relief chamber with increased volume.

6. The anti-blocking discharge structure for producing waste tire regenerated rubber according to claim 1, characterized in that: The length of the shear rod (92) is 15% of the inner diameter of the lining plate (31) and is not greater than 50 mm.

7. The anti-blocking discharge structure for producing waste tire regenerated rubber according to claim 1, characterized in that: A 60° conical horn-shaped feeding port (4) is welded at the top of the feeding end of the conveying cylinder (3), a straight cylindrical discharging port (5) with a diameter expansion of 20% is connected to the bottom of the discharging end, and the inner wall of the discharging port (5) is lined with a ceramic wear-resistant layer.

8. The anti-blocking discharge structure for producing waste tire regenerated rubber according to claim 1, characterized in that: A rectangular maintenance window (6) is formed at the top of the conveying cylinder (3), the window covers two adjacent groups of shear rod assemblies (9), a silica gel sealing strip is embedded in the flange edge of the maintenance window (6), and a ceramic patch is welded on the inner side of the window cover.

9. The anti-clogging discharge structure for producing waste tire regenerated rubber according to claim 1, characterized in that: The conversion relationship between the axial displacement ΔL of the sliding rod (82) and the radial gap ΔH of the blade (81) satisfies ΔH=ΔL·tanθ, wherein θ is the angle between the gradually deepening sliding groove (83) and the axis of the spindle (7), and the value range is 15°-45°.

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