A method for preparing glue powder by high-pressure water jet compounding

Abstract

A method for preparing rubber powder by high-pressure water jet composite method, the preparation steps are: S1. crushing rubber particles; S2. impact filtration; S3. in-liquid circulation of rubber powder; S4. solid phase separation and recovery. The cavitation effect and high-speed impact effect in the super-high-pressure water jet of the application can make the rubber material achieve the effect of low-temperature crushing at room temperature, so that the fine rubber powder can be prepared at room temperature with low energy consumption, low cost and green environmental protection. The impact filtration device not only accelerates the flow rate of the rubber powder liquid, but also maximizes the actual filtration area of the filter cartridge, greatly improving the filtration effect and efficiency.

Description

Technical Field

[0001] This invention relates to the field of rubber powder preparation technology, and in particular to a method for preparing rubber powder using a high-pressure water jet composite method. Background Technology

[0002] With the rapid development of domestic automobile manufacturing, chemical and other industries in recent years, the tire and rubber product industries have also developed rapidly. my country attaches great importance to the recycling of waste tire rubber, and the main method is to use waste tires to produce reclaimed rubber. However, the reclaimed rubber production process is outdated, energy-intensive and polluting, and the resulting rubber powder has a large particle size.

[0003] Due to its incompressibility, high coefficient of friction, and elasticity, rubber is difficult to break and separate. Currently, the commonly used methods for producing tire rubber powder both domestically and internationally are divided into three types: room temperature method, low temperature method, and wet method.

[0004] 1. The room temperature method, which uses traditional mechanical equipment for crushing, produces rubber powder with large particle size, which cannot obtain high-quality fine rubber powder, has low reuse value, and is not suitable for tire remanufacturing requirements.

[0005] 2. Low-temperature pulverization method, which often uses liquid nitrogen as a refrigerant, can reach a cooling temperature of -196°C. It can produce high-quality fine adhesive powder with small particle size and high reuse value. However, due to excessive energy consumption and high production cost, it has poor economic efficiency and cannot be widely promoted and applied in engineering.

[0006] 3. Wet solution pulverization method: The wet method involves placing rubber blocks in a solution and pulverizing them using a grinding disc rubber mill or other related mechanical equipment to produce high-quality fine rubber powder with small particle size. This method has high reuse value, but it requires high investment, has low efficiency, and cannot be applied in engineering.

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

[0008] The present invention aims to address the shortcomings of the prior art by providing a method for preparing adhesive powder using a high-pressure water jet composite method.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

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

[0011] S1. Crushing rubber particles: A crushing cylinder is installed outside a multi-nozzle cutting nozzle. A fixed multi-nozzle cutting nozzle is connected to an ultra-high pressure water generation system to form multiple sets of water jets. Multiple sets of vertical blades are set on the inner wall of the crushing cylinder. The crushing cylinder is driven to rotate by a first servo motor. A filter cylinder with radial arc blades at the bottom is matched outside the crushing cylinder. The water jets generate a suction effect on the rubber particles, causing the rotating liquid to move downward to form turbulence and eddies, which performs high-frequency cutting and crushing of the rubber particles.

[0012] S2. Impact Filtration: The pulverized rubber powder liquid flows downward from the top of the pulverizing cylinder under the strong impact of the multi-nozzle cutting nozzle, passing through the arc-shaped blade position at the bottom of the filter cylinder. The filter cylinder is driven to rotate by the second servo motor. The rotation of the arc-shaped blade at the bottom of the filter cylinder generates centrifugal force in the rubber powder liquid. The rubber powder liquid then accelerates outward from the bottom center of the filter cylinder along the circumferential direction to the filter screen of the filter cylinder. At the same time, the rubber powder liquid continuously enters the annular cavity between the outer wall of the pulverizing cylinder and the inner wall of the filter cylinder. The outer wall of the pulverizing cylinder is equipped with spiral conveying blades, which form 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 top, forming impact filtration. The rubber powder liquid that meets the filtration particle size flows out of the filter cylinder and enters the collection cylinder.

[0013] S3. Internal circulation of adhesive powder liquid: After filtration, some of the larger adhesive particles in the liquid re-enter the grinding cylinder through the upper channel of the annular cavity for secondary grinding; thus, the adhesive powder liquid continuously circulates from top to bottom into the filter cylinder for filtration, while some of the larger adhesive powder liquid enters the grinding cylinder from bottom to top again, where it is cut and crushed together with the newly added adhesive particles, forming an internal circulation of the adhesive powder liquid for grinding and filtration;

[0014] S4 Solid-phase separation and recovery: The fine rubber powder liquid in the collection 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 obliquely downward. The multi-nozzle cutting nozzle is evenly distributed in layers along the circumference to maximize circumferential coverage. There are multiple sets of high-pressure water jets in the annular cavity direction between the multi-nozzle cutting nozzle and the crushing cylinder.

[0016] During the crushing process in step S1, because the water jet is a submerged jet, the water jet cuts the rubber particles inside the crushing cylinder at an angle downwards. Finally, the particles are reflected downwards on the inner wall of the crushing cylinder and then cut by the next layer of water jets. This process is repeated multiple times.

[0017] The ultra-high pressure water generation system operates at a pressure of 350 MPa and a flow rate of 20–24 L / min.

[0018] The multi-nozzle cutting nozzle has eight ultra-high pressure water nozzles evenly distributed radially in the circumferential direction, and two ultra-high pressure water nozzles in each of the four vertical layers, with each layer having two ultra-high pressure water nozzles at 180° angles. Each ultra-high pressure water nozzle forms an angle of 10-15° with the horizontal plane and faces the lower part of the crushing chamber. The multi-nozzle cutting nozzle is suspended inside the crushing cylinder, with its bottom end 30mm away from the lower end of the crushing cylinder.

[0019] The number of vertical blades 1 on the inner wall of the crushing cylinder is 8 sets, 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 vertically arranged spiral conveying blades on the outer wall of the crushing cylinder is 1 / 5 to 1 / 3 of the diameter of the crushing cylinder.

[0021] The beneficial effects of this invention are: the cavitation and high-speed impact in the ultra-high pressure water jet of this 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 filtration device not only accelerates the flow rate of rubber powder liquid, but also maximizes the actual filtration area of ​​the filter cartridge, which greatly improves the filtration effect and efficiency. Attached Figure Description

[0022] Figure 1 The apparatus for producing adhesive powder by high-pressure water jet composite method according to the present invention;

[0023] In the diagram: 1-Ultra-high pressure water generation system; 2-Multi-nozzle cutting nozzle; 3-Grinding cylinder; 311-Vertical blade; 312-Screw conveyor blade; 322-Hollow shaft bearing seat; 324-First servo motor; 325-Hollow flange; 4-Filter cylinder; 423-Second servo motor; 5-Liquid collection cylinder; 8-Discharge pipe;

[0024] The following will describe in detail, with reference to the accompanying drawings, embodiments of the invention. Detailed Implementation

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

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

[0027] S1. Crushing rubber particles: A crushing cylinder 3 is installed outside the multi-nozzle cutting nozzle 2. The fixed multi-nozzle cutting nozzle 2 is connected to the ultra-high pressure water generation system 1 to form multiple sets of water jets. Multiple sets of vertical blades 311 are set on the inner wall of the crushing cylinder 3. The crushing cylinder 3 is driven to rotate by the first servo motor 324. A filter cylinder 4 with radial arc blades at the bottom is matched outside the crushing cylinder 3. The water jets generate a suction effect on the rubber particles, causing the rotating liquid to move downward to form turbulence and eddies, which performs high-frequency cutting and crushing of the rubber particles.

[0028] 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 in the rubber powder liquid. The rubber powder liquid then accelerates outward from the bottom center 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 spiral conveying blades 312, which form 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 filtration particle size flows out of the filter cylinder 4 and enters the collection cylinder 5.

[0029] S3. Internal circulation of adhesive powder liquid: After filtration, some of the larger adhesive particles in the liquid re-enter the grinding cylinder 3 through the upper channel of the annular cavity for secondary grinding; thus, the adhesive powder liquid continuously circulates from top to bottom into the filter cylinder 4 for filtration, while some of the larger adhesive powder liquid enters the grinding cylinder 3 from bottom to top and is cut and crushed together with the newly added adhesive particles, forming an internal circulation of the grinding and filtration of the adhesive powder liquid;

[0030] S4 Solid phase separation and recovery: The fine rubber powder liquid in the collection 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 is at an angle to the horizontal plane and is obliquely downward. The multi-nozzle cutting nozzle 2 is evenly distributed in layers along the circumferential direction to maximize circumferential coverage. There are multiple sets of high-pressure water jets in the annular cavity direction between the multi-nozzle cutting nozzle 2 and the crushing cylinder 3.

[0032] During the crushing process in step S1, because the water jet is a submerged jet, the water jet cuts the rubber particles in the crushing cylinder 3 at an angle downwards. Finally, the particles are reflected downwards on the inner wall of the crushing cylinder and then cut by the next layer of water jet. This process is repeated multiple times.

[0033] The ultra-high pressure water generation system operates at a pressure of 350 MPa and a flow rate of 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 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 forms an angle of 10-15° with the horizontal plane and faces the lower part of the crushing chamber 3. The multi-nozzle cutting nozzle 2 is suspended inside the crushing cylinder 3, and the bottom end is 30mm away from the lower end of the crushing cylinder 3.

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

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

[0037] The present invention adopts a fixed layered multi-nozzle cutting nozzle, that is, a crushing chamber structure composed of multiple water jets integrated with a rotating crushing cylinder 3, which causes the rubber granules to generate a turbulent vortex, thereby realizing high-frequency crushing of rubber granules by multiple water jets.

[0038] A crushing cylinder 3 with spiral conveying blades 312 on the outer wall and vertical blades 311 on the inner wall is matched with a filter cylinder 4 with arc-shaped blades at the bottom, and the two rotate in opposite directions. During the crushing of rubber particles, the rubber particles are accelerated to rotate, flow and circulate. Under the combined action of high-pressure water jet and vertical blades 311, the rubber particles are continuously crushed at high frequency, which greatly improves the crushing efficiency and effect of rubber particles.

[0039] The use of an impact filtration device not only accelerates the flow rate of the adhesive powder liquid, but also maximizes the actual filtration area of ​​the filter cartridge 4, thus greatly improving the filtration effect and efficiency.

[0040] The rotating device of the crushing cylinder 3 adopts a hollow shaft bearing seat 322 and hollow flange 325 structure, which allows the high pressure pipeline to be conveniently installed in the crushing cylinder 3 through the center of the hollow shaft bearing seat 322 and the fixed multi-nozzle cutting nozzle 2, while realizing the rotation of the crushing cylinder 3 and also having the function of a feeding port.

[0041] The cavitation and high-speed impact of high-pressure water jets enable rubber materials to achieve low-temperature crushing at room temperature, thus achieving the purpose of producing fine rubber powder at room temperature with low energy consumption, low cost, and environmental friendliness.

[0042] The working principle of this 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 circumference to maximize full coverage in the circumference direction. There are 8 sets of high pressure water jets (8 water jets) in the annular cavity direction of the multi-nozzle cutting nozzle 2 and the crushing cylinder 3.

[0043] The ultra-high pressure water nozzle outlet of the multi-nozzle cutting head 2 is arranged obliquely downward inside the crushing cylinder 3. During the crushing process, because the water jet is a submerged jet, it cuts the rubber particles inside the crushing cylinder 3 at an oblique downward angle. The particles are then reflected downwards onto the inner wall of the crushing cylinder 3 and cut again by the next layer of water jets, thus undergoing multiple water jet cuts. The water jet creates a suction effect on the rubber particles, causing the rubber particles entering the crushing cylinder 3 to move downwards, forming turbulence and eddies. Simultaneously, the vertical blades 311 on the inner wall of the crushing cylinder 3 rotate, causing the rubber particles to flow in a rotating manner along the circumference of the multi-nozzle cutting head 2, achieving high-frequency cutting and crushing 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 adhesive powder flows from top to bottom in the crushing cylinder 3 to the bottom of the filter cylinder 4 at the arc-shaped blade position. Then, the rotating arc-shaped blade of the filter cylinder 4 generates centrifugal force, causing the adhesive powder to accelerate from the bottom of the crushing cylinder 3 along the circumferential direction to the rotating filter screen of the filter cylinder 4.

[0045] As the spiral conveyor blades 312 rotate on the outer wall of the crushing cylinder 3, the slurry of adhesive powder flows rapidly from bottom to top through the annular cavity between the outer wall of the crushing cylinder 3 and the inner wall of the filter cylinder 4 for filtration, generating an impact filtration effect. The slurry of adhesive powder that meets the filtration particle size is filtered out and enters the collection cylinder 5, while the slurry of larger adhesive particles enters the crushing chamber 3 through the opening at the top of the crushing cylinder 3 and is crushed together with the newly entered adhesive particles from the feed inlet. In this way, a cycle of filtration and continuous crushing is formed.

[0046] In the description of the invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 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.

[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 indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution, or direct application to other situations without modification, are all within the scope of protection of the invention.

Claims

1. A method for producing a glue powder by using a high-pressure water jet compounding method, characterized by, The preparation steps are as follows: S1. Crushing rubber particles: A crushing cylinder (3) is installed outside the multi-nozzle cutting nozzle (2). The fixed multi-nozzle cutting nozzle (2) is connected to the ultra-high pressure water generation system (1) to form multiple sets of water jets. Multiple sets of vertical blades (311) are set on the inner wall of the crushing cylinder (3). The crushing cylinder (3) is driven to rotate by the first servo motor (324). A filter cylinder (4) with radial arc blades at the bottom is matched outside the crushing cylinder (3). The water jets generate a suction effect on the rubber particles, causing the rotating liquid to move downward to form turbulence and eddies, and the rubber particles are cut and crushed at high frequency. S2. Impact filtration: The crushed rubber powder liquid flows downward from the upper part of the crushing cylinder (3) under the strong impact of the multi-nozzle cutting nozzle (2) and passes through the bottom arc blade position of the filter cylinder (4). The filter cylinder (4) is driven to rotate by the second servo motor (423). The rotation of the bottom arc blade of the filter cylinder (4) causes the rubber powder liquid to generate centrifugal force. The rubber powder liquid then accelerates outward from the bottom center 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 crushing cylinder (3) and the inner wall of the filter cylinder (4). The outer wall of the crushing cylinder (3) is provided with spiral conveying blades (312), which form 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 filtration particle size flows out of the filter cylinder (4) and enters the collection cylinder (5). S3. Internal circulation of adhesive powder liquid: After filtration, some of the larger adhesive particles in the liquid re-enter the grinding cylinder (3) through the upper hole of the grinding cylinder (3) from the annular cavity for secondary grinding; thus, the adhesive powder liquid continuously circulates from top to bottom into the filter cylinder (4) for filtration, and some of the larger adhesive powder liquid enters the grinding cylinder (3) from bottom to top again, and is cut and crushed with the newly added adhesive particles, forming an internal circulation of the grinding and filtration of adhesive powder liquid; S4 Solid phase separation and recovery: The fine rubber powder liquid in the collection 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 of claim 1, wherein the method is characterized by, 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 cover the circumferential direction to the maximum extent. There are multiple sets of high-pressure water jets in the annular cavity direction between the multi-nozzle cutting nozzle (2) and the crushing cylinder (3).

3. The method of claim 2, wherein the method is characterized by, During the crushing process in step S1, because the water jet is a submerged jet, the water jet cuts the rubber particles in the crushing cylinder (3) at an angle downwards. Finally, the particles are reflected downwards on the inner wall of the crushing cylinder and then cut by the next layer of water jet. This process is repeated multiple times.

4. The method of claim 1, wherein the method is characterized by, The ultra-high pressure water generation system operates at a pressure of 350 MPa and a flow rate of 20–24 L / min.

5. The method of claim 2, wherein the method is characterized by, The multi-nozzle cutting nozzle (2) has 8 ultra-high pressure water nozzles evenly distributed radially in the circumferential direction and 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 forms an angle of 10-15° with the horizontal plane and faces the lower part of the crushing cylinder (3). The multi-nozzle cutting nozzle (2) is suspended inside the crushing cylinder (3) and the bottom end is 30mm away from the lower end of the crushing cylinder (3).

6. The method of claim 5, wherein the method is characterized by, The number of vertical blades (311) on the inner wall of the crushing cylinder (3) is 8 sets, 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 of claim 6, wherein the method is characterized by, The pitch of the vertically arranged spiral conveying blades (312) on the outer wall of the crushing cylinder (3) is 1 / 5 to 1 / 3 of the diameter of the crushing cylinder (3).

Images