Method for preparing rubber powder by adopting high-pressure water jet composite method

Abstract

The invention relates to a method for preparing rubber powder by adopting a high-pressure water jet composite method. The method comprises the following preparation steps: S1, crushing rubber particles; s2, performing impact type filtration; s3, internal circulation of the rubber powder liquid; and S4, solid-phase separation and recovery. The cavitation effect and the high-speed impact effect in ultrahigh-pressure water jet can enable a rubber material to achieve the low-temperature crushing effect at the normal temperature, so that the purpose of preparing fine rubber powder can be achieved at the normal temperature in a low-energy-consumption, low-cost and environment-friendly manner; meanwhile, the actual filtering area of the filter cartridge is increased to the maximum extent, and the filtering effect and efficiency are improved to a great extent.

Description

Technical Field

[0001] The invention relates to the technical field of rubber powder preparation, in particular to a method for preparing rubber powder by adopting a high-pressure water jet composite method. Background Art

[0002] The rapid development of domestic industries such as automobile manufacturing and the chemical industry in recent years has boosted the growth of industries such as tires and rubber products. Currently, my country has become a major producer and consumer of automobile tires. However, since my country's rubber reserves and production far exceed domestic demand and consumption, it needs to import rubber to accommodate industrial development. my country attaches great importance to the recycling of waste tire rubber. The main method is to produce reclaimed rubber from waste tires. However, the production process of reclaimed rubber is backward, energy-intensive, and polluting, and the resulting rubber powder has a large particle size.

[0003] Due to the incompressibility, high friction coefficient and elasticity of rubber, it is not easy to crush and separate. Currently, there are three common methods for crushing tire rubber into rubber powder at home and abroad: normal temperature method, low temperature method and wet method.

[0004] 1. Normal temperature method, using traditional mechanical equipment to crush, the rubber powder obtained has large particle size, and high-quality fine rubber powder cannot be obtained, the recycling value is low, and it is not suitable for tire reproduction requirements.

[0005] 2. Low-temperature crushing method, which often uses liquid nitrogen as a refrigerant, and the refrigeration temperature can reach -196°, can produce high-quality fine rubber powder with small particle size and high recycling value. However, due to excessive energy consumption and high production costs, it has poor economic efficiency and cannot be promoted and applied in engineering.

[0006] 3. Wet solution grinding method: the wet method is to place the rubber block in the solution and use the grinding disc rubber grinder and other related mechanical equipment to grind it to obtain high-quality fine rubber powder with small particle size, which has high reuse value. However, this method has high investment and low efficiency and cannot be applied in engineering.

[0007] Therefore, a reasonable process route and equipment are needed to use waste tire rubber to produce fine rubber powder with small particle size, save imported raw rubber, and make it a secondary resource source for the rubber industry. Summary of the Invention

[0008] The present invention aims to solve the deficiencies of the prior art and provides a method for preparing rubber powder by adopting a high-pressure water jet compound method.

[0009] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0010] A method for preparing rubber powder by using a high-pressure water jet composite method, wherein the preparation steps are as follows:

[0011] S1. Crushing Rubber Particles: A crushing barrel is installed outside a multi-nozzle cutting nozzle. The fixed multi-nozzle cutting nozzle is connected to an ultra-high-pressure water generation system to form multiple groups of water jets. Multiple groups of vertical blades are installed on the inner wall of the crushing barrel. The crushing barrel is driven by a first servo motor. A filter barrel with radial curved blades at the bottom is installed outside the crushing barrel. The water jet creates a suction effect on the rubber liquid, causing the rotating liquid to move downward to form turbulent flow and eddy currents, which cut and crush the rubber particles at high frequency.

[0012] S2. Impact Filtration: The crushed rubber powder liquid flows downward from the upper part of the crushing drum under the strong impact of the multi-nozzle cutting nozzle, passing through the curved blade position at the bottom of the filter drum. The filter drum is driven to rotate by the second servo motor. The rotation of the curved blade at the bottom of the filter drum generates centrifugal force for the rubber powder liquid, and the rubber powder liquid is then accelerated outward along the circumferential direction from the center of the bottom of the filter drum to the filter drum filter screen. At the same time, the rubber powder liquid continuously enters the annular cavity between the outer wall of the crushing drum and the inner wall of the filter drum. The outer wall of the crushing drum is equipped with spiral conveying blades, forming a spiral conveyor structure in the annular cavity. The rubber powder liquid continues to flow rapidly from the bottom of the annular cavity to the upper part, forming impact filtration. The rubber powder liquid that meets the filter particle size flows out of the filter drum and enters the liquid collection drum.

[0013] S3. Internal Circulation of Rubber Powder Liquid: After filtration, the larger particles re-enter the grinding cylinder through the annular cavity and the upper channel of the grinding cylinder for secondary grinding. Thus, the rubber powder liquid continuously circulates from the inner cavity of the grinding cylinder to the filter cylinder for filtration. The larger particles then re-enter the grinding cylinder from the bottom up, where they are cut and crushed with the newly added particles, forming an internal grinding and filtering cycle for the rubber powder liquid.

[0014] S4 solid phase separation and recovery: The fine rubber powder liquid in the liquid collecting cylinder flows out through the discharge pipe and enters the solid phase separation device, where the rubber powder is recovered and the water is recycled.

[0015] The ultra-high-pressure water nozzle of the multi-nozzle cutting nozzle has an angle with the horizontal plane and is inclined downward. The multi-nozzle cutting nozzle is evenly distributed in layers along the circumferential direction to maximize coverage in the circumferential direction. There are multiple groups of high-pressure water jets in the direction of the annular cavity between the multi-nozzle cutting nozzle and the crushing barrel.

[0016] During the pulverization process of step S1, since the water jet is a submerged jet, the water jet cuts the rubber particles in the pulverization tube obliquely downward, and finally reflects downward on the inner wall of the pulverization tube, and then is cut by the next layer of water jet, and this process is repeated multiple times.

[0017] The working pressure of the ultra-high pressure water generating system is 350 MPa and the flow rate is 20-24 L / min.

[0018] The multi-nozzle cutting nozzle has 8 ultra-high pressure water nozzles radially distributed in the circumferential direction, and is divided into 4 layers in the vertical direction, with 2 ultra-high pressure water nozzles in each layer distributed at 180°. Each ultra-high pressure water nozzle makes an angle of 10 to 15° with the horizontal plane and faces the lower part of the crushing chamber. The multi-nozzle cutting nozzle is suspended in the crushing barrel, and the bottom end is 30 mm away from the lower end of the crushing barrel.

[0019] The number of the vertical blades 1 on the inner wall of the crushing cylinder is 8 groups, and the height of the vertical blades is 3 / 5 to 4 / 5 of the diameter of the crushing cylinder.

[0020] The pitch of the spiral conveying blades vertically arranged on the outer wall of the grinding cylinder is 1 / 5 to 1 / 3 of the diameter of the grinding cylinder.

[0021] The beneficial effects of the present invention are as follows: the cavitation effect and high-speed impact effect in the ultra-high-pressure water jet of the present invention can achieve the effect of low-temperature crushing of rubber materials at room temperature, thereby achieving the purpose of producing fine rubber powder at room temperature with low energy consumption, low cost, and green environmental protection. The impact filtering device not only accelerates the flow rate of the rubber powder liquid, but also maximizes the actual filtering area of ​​the filter cartridge, thereby greatly improving the filtering effect and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The device for preparing rubber powder by the high-pressure water jet composite method of the present invention;

[0023] Figure: 1 - Ultra-high pressure water generating system; 2 - Multi-nozzle cutting nozzle; 3 - Crushing cylinder; 311 - Vertical blade; 312 - Spiral conveying blade; 322 - Hollow shaft bearing seat; 324 - First servo motor; 325 - Hollow flange; 4 - Filter cylinder; 423 - Second servo motor; 5 - Liquid collecting cylinder; 8 - Discharge pipe;

[0024] The following is a detailed description of the embodiments of the invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and examples:

[0026] A method for preparing rubber powder by using a high-pressure water jet composite method, wherein the preparation steps are as follows:

[0027] S1. Crushing rubber particles: A crushing drum 3 is disposed outside a multi-nozzle cutting nozzle 2. The fixed multi-nozzle cutting nozzle 2 is connected to an ultra-high pressure water generating system 1 to form multiple water jets. Multiple sets of vertical blades 311 are installed on the inner wall of the crushing drum 3. The crushing drum 3 is driven to rotate by a first servo motor 324. A filter drum 4 with radially curved blades at the bottom is matched with the crushing drum 3. The water jet creates an entrainment effect on the rubber liquid, causing the rotating liquid to move downward, forming turbulent flow and eddy currents, thereby cutting and crushing the rubber particles at high frequency.

[0028] S2. Impact filtration: The crushed rubber powder liquid flows downward from the upper portion of the crushing drum 3 under the strong impact of the multi-nozzle cutting nozzle 2, passing through the curved blade position at the bottom of the filter drum 4. The filter drum 4 is driven to rotate by the second servo motor 423. The rotation of the curved blade at the bottom of the filter drum 4 generates centrifugal force for the rubber powder liquid, causing the rubber powder liquid to accelerate outward along the circumferential direction from the center of the bottom of the filter drum 4 to the filter screen of the filter drum 4. At the same time, the rubber powder liquid continuously enters the annular cavity between the outer wall of the crushing drum 3 and the inner wall of the filter drum 4. The outer wall of the crushing drum 3 is provided with spiral conveying blades 312, forming a spiral conveyor structure in the annular cavity. The rubber powder liquid continues to flow rapidly from the bottom of the annular cavity to the upper portion, forming impact filtration. The rubber powder liquid that meets the filter particle size flows out of the filter drum 4 and enters the liquid collecting drum 5.

[0029] S3. Internal Circulation of Rubber Powder Liquid: After filtration, the larger particles re-enter the grinding drum 3 through the annular cavity and the upper channel of the grinding drum 3 for secondary grinding. The rubber powder liquid then continuously circulates from the inner cavity of the grinding drum 3 downwards and enters the filter drum 4 for filtration. The larger particles then re-enter the grinding drum 3 from the bottom up, where they are cut and crushed with the newly added particles, forming an internal grinding and filtering cycle for the rubber powder liquid.

[0030] S4 Solid phase separation and recovery: The fine rubber powder liquid in the liquid collecting cylinder 5 flows out through the discharge pipe 8 and enters the solid phase separation device, where the rubber powder is recovered and the water is recycled.

[0031] The ultra-high-pressure water nozzle of the multi-nozzle cutting nozzle 2 has an angle with the horizontal plane and is inclined downward. The multi-nozzle cutting nozzle 2 is evenly distributed in layers along the circumferential direction to maximize coverage in the circumferential direction. There are multiple groups of high-pressure water jets in the direction of the annular cavity between the multi-nozzle cutting nozzle 2 and the crushing barrel 3.

[0032] During the pulverization process of step S1, since the water jet is a submerged jet, the water jet cuts the rubber particles in the pulverizing cylinder 3 obliquely downward, and finally reflects downward on the inner wall of the pulverizing cylinder, and then is cut by the next layer of water jet, and this process is repeated multiple times.

[0033] The working pressure of the ultra-high pressure water generating system is 350 MPa and the flow rate is 20-24 L / min.

[0034] The multi-nozzle cutting nozzle 2 has 8 ultra-high pressure water nozzles radially distributed in the circumferential direction, and is divided into 4 layers in the vertical direction, with 2 ultra-high pressure water nozzles in each layer distributed at 180°. Each ultra-high pressure water nozzle makes an angle of 10 to 15° with the horizontal plane and faces the lower part of the crushing chamber 3. The multi-nozzle cutting nozzle 2 is suspended in the crushing barrel 3, and the bottom end is 30 mm away from the lower end of the crushing barrel 3.

[0035] The number of the vertical blades 311 on the inner wall of the grinding cylinder 3 is 8 groups, and the height of the vertical blades 311 is 3 / 5 to 4 / 5 of the diameter of the grinding cylinder 3.

[0036] The pitch of the spiral conveying blades 312 vertically arranged on the outer wall of the grinding cylinder 3 is 1 / 5 to 1 / 3 of the diameter of the grinding cylinder 3.

[0037] The present invention adopts a fixed layered multi-nozzle cutting nozzle, that is, a grinding chamber structure composed of multiple water knives integrated with a rotating grinding cylinder 3, so that the rubber liquid generates a turbulent vortex flow, and the multiple water knives can grind the rubber particles at a high frequency;

[0038] A crushing drum 3 with spiral conveying blades 312 on its outer wall and vertical blades 311 on its inner wall is paired with a filter drum 4 with curved blades at its bottom, rotating in opposite directions. During the rubber pellet crushing process, the rubber pellet liquid is accelerated to rotate, flow, and circulate. The combined action of the high-pressure water jet and the vertical blades 311 continuously and frequently crushes the rubber pellets, greatly improving the efficiency and effectiveness of the crushing process.

[0039] The use of impact filtering device not only accelerates the flow rate of the rubber powder liquid, but also maximizes the actual filtering area of ​​the filter cartridge 4, greatly improving the filtering effect and efficiency;

[0040] The rotating device of the grinding drum 3 adopts a hollow shaft bearing seat 322 and a hollow flange 325 structure, so that the high-pressure pipeline can be easily installed and arranged in the grinding drum 3 through the center of the hollow shaft bearing seat 322 and the fixed multi-nozzle cutting nozzle 2. At the same time, the grinding drum 3 can be rotated and also has the function of a feeding port.

[0041] The cavitation and high-speed impact in the high-pressure water jet can achieve the effect of low-temperature crushing of rubber materials at room temperature, thereby achieving the purpose of producing fine rubber powder at room temperature with low energy consumption, low cost and green environmental protection.

[0042] The working principle of the present invention is as follows: the ultra-high pressure water nozzle of the fixed multi-nozzle cutting nozzle 2 is angled downward with the horizontal plane, the ultra-high pressure water nozzle is evenly distributed in layers along the circumferential direction, and the maximum coverage in the circumferential direction is achieved. There are 8 groups of high-pressure water jets (8 water knives) in the direction of the annular cavity of the multi-nozzle cutting nozzle 2 and the crushing barrel 3.

[0043] The ultra-high-pressure water nozzle outlet of the multi-nozzle cutting nozzle 2 is arranged obliquely downward within the pulverizing barrel 3. During the pulverizing process, because the water jet is a submerged jet, it cuts the rubber particles within the pulverizing barrel 3 obliquely downward, eventually reflecting downward onto the inner wall of the pulverizing barrel 3 before being cut by the next layer of water jets. This process continues multiple times. The water jet creates an entrainment effect on the rubber liquid, causing the rubber particles entering the pulverizing barrel 3 to form turbulent flow and eddies as the liquid moves downward. Simultaneously, the vertical blades 311 on the inner wall of the pulverizing barrel 3 rotate, causing the liquid to rotate and flow along the circumference of the multi-nozzle cutting nozzle 2, achieving high-frequency cutting and pulverizing of the rubber particles by the high-pressure water jet.

[0044] Under the strong impact of the water jet from the multi-nozzle cutting nozzle 2, the crushed rubber powder liquid flows from top to bottom in the crushing cylinder 3 to the position of the arc-shaped blade at the bottom of the filter cylinder 4, and then passes through the rotating arc-shaped blade of the filter cylinder 4 to generate centrifugal force for the rubber powder liquid, and accelerates to flow from the bottom of the crushing cylinder 3 along the circumferential direction to the rotating filter cylinder 4 filter screen.

[0045] As spiral conveying blades 312 on the outer wall of pulverizing drum 3 rotate, the rubber powder liquid rapidly flows upward through the annular cavity between the outer wall of pulverizing drum 3 and the inner wall of filter drum 4, creating an impact filtration effect. Powder liquid meeting the filter particle size is filtered out and enters liquid collection drum 5. Larger rubber particles enter pulverizing chamber 3 through the upper opening of pulverizing drum 3 and are pulverized together with the newly entered rubber particles from the feed port, thus forming a cycle of filtration and continuous pulverization.

[0046] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the invention.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of an invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0048] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] The invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the invention, or they are directly applied to other occasions without improvement, they are all within the scope of protection of the invention.

Claims

1. A method for preparing rubber powder by high-pressure water jet compounding, characterized in that: The preparation steps are: S1. Crushing rubber particles: a crushing cylinder (3) is provided outside a multi-nozzle cutting nozzle (2), a fixed multi-nozzle cutting nozzle (2) is connected to an ultra-high pressure water generating system (1), forming multiple groups of water jets, multiple groups of vertical blades (311) are provided on the inner wall of the crushing cylinder (3), the crushing cylinder (3) is driven to rotate by a first servo motor (324), a filter cylinder (4) with radial arc blades provided at the bottom is provided outside the crushing cylinder (3), the water jet produces a suction effect on the rubber liquid, causing the rotating liquid to move downward to form turbulence and eddy currents, and the rubber particles are cut and crushed at high frequency; S2. Impact filtration: The pulverized rubber powder liquid flows downward from the upper part of the pulverizing cylinder (3) under the strong impact of the multi-nozzle cutting nozzle (2) and passes through the arc-shaped blade position at the bottom of the filter cylinder (4). The filter cylinder (4) is driven to rotate by the second servo motor (423). The rotation of the arc-shaped blade at the bottom of the filter cylinder (4) generates centrifugal force for the rubber powder liquid. The rubber powder liquid then flows outward from the center of the bottom of the filter cylinder (4) along the circumferential direction to the filter screen of the filter cylinder (4). At the same time, the rubber powder liquid continuously enters the annular cavity between the outer wall of the pulverizing cylinder (3) and the inner wall of the filter cylinder (4). The outer wall of the pulverizing cylinder (3) is provided with a spiral conveying blade (312). The structure of the spiral conveyor is formed in the annular cavity. The rubber powder liquid continues to flow rapidly from the bottom of the annular cavity to the upper part, forming impact filtration. The rubber powder liquid that meets the filtration particle size flows out of the filter cylinder (4) and enters the liquid collecting cylinder (5); S3. Internal circulation of the rubber powder liquid: After being filtered, the part of the rubber powder liquid with larger particle size enters the grinding cylinder (3) again through the annular cavity from the upper hole of the grinding cylinder (3) for secondary grinding; thus, the rubber powder liquid continuously circulates from the inner cavity of the grinding cylinder (3) from top to bottom and enters the filter cylinder (4) for filtration, and the part of the rubber powder liquid with larger particles enters the inner cavity of the grinding cylinder (3) from bottom to top, and is cut and ground with the newly added rubber particles, forming an internal circulation of grinding and filtering of the rubber powder liquid; S4 solid phase separation and recovery: the fine rubber powder liquid in the liquid collecting cylinder (5) flows out through the discharge pipe (8) and enters the solid phase separation device, the rubber powder is recovered, and the water is recycled.

2. The method for preparing rubber powder by high-pressure water jet compounding according to claim 1, characterized in that: The ultra-high-pressure water nozzle of the multi-nozzle cutting nozzle (2) is angled with the horizontal plane and is obliquely downward. The multi-nozzle cutting nozzle (2) is evenly distributed in layers along the circumferential direction, covering the circumferential direction to the maximum extent. There are multiple groups of high-pressure water jets in the direction of the annular cavity between the multi-nozzle cutting nozzle (2) and the crushing cylinder (3).

3. The method for preparing rubber powder by high-pressure water jet compounding according to claim 2, characterized in that: During the pulverization process of step S1, since the water jet is a submerged jet, the water jet cuts the rubber particles in the pulverizing cylinder (3) obliquely downward, and finally reflects downward on the inner wall of the pulverizing cylinder, and then is cut by the next layer of water jet, and thus undergoes multiple water jet cuttings.

4. The method for preparing rubber powder by high-pressure water jet compounding according to claim 1, characterized in that: The working pressure of the ultra-high pressure water generating system is 350 MPa and the flow rate is 20-24 L / min.

5. The method for preparing rubber powder by high-pressure water jet compounding according to claim 2, characterized in that: The multi-nozzle cutting nozzle (2) has 8 ultra-high pressure water nozzles radially distributed in the circumferential direction, and is divided into 4 layers in the vertical direction, with 2 ultra-high pressure water nozzles in each layer distributed at 180 degrees. Each ultra-high pressure water nozzle forms an angle of 10 to 15 degrees with the horizontal plane and faces the lower part of the crushing chamber (3). The multi-nozzle cutting nozzle (2) is suspended in the crushing cylinder (3), and the bottom end is 30 mm away from the lower end of the crushing cylinder (3).

6. The method for preparing rubber powder by high-pressure water jet compounding according to claim 5, characterized in that: The number of vertical blades (311) on the inner wall of the crushing cylinder (3) is 8 groups, and the height of the vertical blades (311) is 3 / 5 to 4 / 5 of the diameter of the crushing cylinder (3).

7. The method for preparing rubber powder by high-pressure water jet compounding according to claim 6, characterized in that: The pitch of the spiral conveying blade (312) vertically arranged on the outer wall of the pulverizing cylinder (3) is 1 / 5 to 1 / 3 of the diameter of the pulverizing cylinder (3).

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