Method and equipment for manufacturing rubber fine powder by using waste tires

Abstract

The invention discloses a method and equipment for manufacturing rubber fine powder by using waste tires, belongs to the technical field of rubber powder manufacturing, and aims to solve the problem that the content of scrap iron impurities in existing mechanically crushed rubber powder is high. The method for manufacturing the rubber fine powder by using the waste tire sequentially comprises the following steps: step 1, separating the waste tire (11) between a tire side (1101) and a tire shoulder (1102) to obtain a tire ring belt (1103); step 2, applying water jet to the tire ring belt (1103) by a crushing water jet cutter, and cutting out a flocculent rubber structure; and the grinding assembly grinds the flocculent rubber structure on the surface of the tire ring belt (1103) to form rubber fine powder. According to the method for manufacturing the rubber fine powder from the waste tires, water jet crushing and grinding crushing are combined, the waste tires can be efficiently utilized for rubber powder processing, and the content of scrap iron impurities in the prepared rubber powder is low.

Description

Technical Field

[0001] The invention relates to the technical field of rubber powder manufacturing, in particular to a method for manufacturing rubber powder using waste tires, and also to equipment for manufacturing rubber powder using waste tires. Background Art

[0002] Waste tires refer to tires that have been replaced or eliminated and have lost their use value, as well as scrap tires produced by factories. With the development of society, private cars and transportation vehicles are increasing, which has also led to a sharp increase in the number of waste tires produced each year. A large number of waste tires piled together are not only prone to fire and other safety hazards, but also cause "black pollution" to the environment. At present, automobile tires basically use radial tires. Generally, radial tires are composed of three materials: rubber, steel wire, and fiber. The most commonly used recycling method for waste tires is mechanical crushing. When the mechanical crushing method is used to process waste tires into rubber powder, the rubber tires are usually cut into strips and blocks, and then the rubber blocks are crushed. The primary rubber powder obtained after crushing is initially deironed, and then crushed, deironed and screened for multiple times to obtain the target rubber powder.

[0003] The rubber powder obtained by mechanical crushing generally has a larger particle size, and usually processes 20-100 mesh rubber powder; for rubber powder above 100 mesh, multiple crushing, iron removal and screening are required, and the particle size distribution range is large, and only part of the target rubber powder above 100 mesh can be obtained by screening. Specifically, the method of crushing tires by mechanical crushing can refer to the Chinese invention patent publication document with application publication number CN104002394A, which was published on August 27, 2014. It discloses a process for producing rubber powder using waste tires, including the steps of separating the waste tires by mouth rings, cutting into strips and blocks, and then crushing and magnetic separation. The crushing and magnetic separation process is as follows: 1. The block tires are crushed and screened by a coarse crusher to obtain 8-10 mesh coarse particles, and the coarse particles are subjected to a first magnetic separation to obtain steel wire and coarse rubber particles, and the steel wire is recovered; 2. The coarse rubber particles are subjected to a second magnetic separation to obtain pure coarse rubber particles and a small amount of rubber particles containing steel wire, and the rubber particles containing steel wire are returned to the coarse crusher for further crushing; 3. The pure coarse rubber particles are crushed by a crusher and then screened to obtain rubber powder.

[0004] The Chinese invention patent document with publication number CN1923486A, published on March 7, 2007, discloses a method and device for preparing rubber powder using waste tires based on water jet technology, wherein the method comprises the following steps: a. firstly, placing the waste tires on a rotating bracket, and placing the waste tires within the effective cutting range of a rotating water jet nozzle with a water pressure greater than 200 MPa, so that the distance between the waste tires and the rotating water jet nozzle is 4-5 cm; 2 or more rotating water jet nozzles are installed above each tire, each rotating water jet nozzle is equipped with 3-5 water nozzles, and the rotating structure of each rotating water jet nozzle is 1-200 MPa. a. The structure is provided with pneumatic or hydraulic force to enable high-speed rotation, so that the high-speed water jet sprayed from the water nozzle rotates under the action of the rotating mechanism to form a high-speed rotating water arrow; b. The waste tire is rotated slowly, and the rotating water jet nozzle is rotated and swung back and forth along an arc track at the same time. Through the composite motion of the waste tire and the rotating water jet nozzle, the rubber on the waste tire is processed into powder by the cutting effect generated by the strong kinetic energy of the water jet, so that the metal wire and rubber in the waste tire are separated; c. The above-mentioned water-containing powdered rubber is subjected to subsequent recycling treatment to obtain the rubber powder obtained by processing the waste tire of the present invention. The device includes a waste tire rubber crushing separator, which is characterized in that the waste tire rubber crushing separator mainly includes a high-pressure water generating device, a rotating water jet nozzle, a waste tire bracket, and a water tank. The output of the high-pressure water generating device is connected to the input end of the rotating water jet nozzle, the rotating water jet nozzle is installed on an arc-shaped swing device placed above the water tank, the waste tire bracket installed with the waste tire is supported in the water tank below the rotating water jet nozzle, the waste tire bracket is connected to a driving mechanism for driving it to rotate, and the water tank is connected to a subsequent processing device through a drain or a water pump; the rotating water jet nozzle is a multi-nozzle rotating water jet nozzle, each swing device is equipped with at least two rotating water jet nozzles, and the distance between the nozzle and the waste tire is 4-5 cm.

[0005] The above technical scheme mainly sets the water flow pressure of the water cutting head (water pressure greater than 200MPa) and the distance between the water cutting head and the tire (distance 1-10 cm), and then through the force of the water flow of the water cutting head on the tire surface, the rubber on the tread is crushed into rubber powder. During the processing, the tire bead of the waste tire is supported by the support rod of the bracket. When the water flow of the water cutting head acts on the wheel rim, the tire bead will vibrate, which will affect the processing of the rubber powder, resulting in poor particle uniformity of the processed rubber powder, and the rubber close to the steel wire layer is difficult to separate cleanly. When the method of increasing the pressure of the water jet and reducing the cutting distance is used for secondary processing, it is easy to damage the steel wire layer of the tire, causing a large amount of steel wire debris to be mixed in the rubber powder, and multiple magnetic separation and impurity removal are required later, affecting the processing efficiency. Summary of the invention

[0006] In order to utilize waste tires to efficiently produce rubber powder with low iron filings impurity content, the present invention provides a method and equipment for producing rubber powder using waste tires. The method for producing rubber powder using waste tires combines water jet crushing and grinding crushing, can efficiently utilize waste tires for rubber powder processing, and the produced rubber powder has low iron filings impurity content.

[0007] The technical solution adopted by the present invention to solve the technical problem is:

[0008] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0009] Step 1, separating the waste tire from the sidewall and the shoulder to obtain a tire ring belt containing the tread and the shoulder;

[0010] Step 2: The tire ring belt is in a tensioned state, and the tire ring belt is rotated in a circumferential direction. The crushing water knife reciprocates along the axial direction of the tire ring belt, and the crushing water knife applies a water jet to the tire ring belt, and cuts the surface of the tire ring belt into a flocculent rubber structure that is not separated from the tire ring belt; the grinding component grinds the flocculent rubber structure on the surface of the tire ring belt to form rubber powder separated from the tire ring belt.

[0011] Through the above technical scheme, by removing the sidewall of the tire, the tire part processed by the water jet is turned into a regular ring belt state; then when the tire ring belt is sleeved on a bracket provided with a plurality of supporting rollers, the tire ring belt can be well tensioned, so that the wheel ring belt is in a stable tensioning state; and when the supporting rollers and / or the grinding wheel drive the tire ring belt to perform circumferential circulation motion, the tire ring belt can move in a stable and controllable state and trajectory, thereby realizing the process control of the water jet device on the crushing of the tire ring belt, so as to achieve a high-quality, stable and controllable rubber powder form;

[0012] When the tire ring belt circulates between the grinding wheel and the supporting roller, the position and parameters of the water jet device are set so that the water jet device generates a water jet to crush the surface of the tire ring belt. The rubber material on the surface of the tire ring belt forms a flocculent structure that is not separated from the wire mesh. Then, the grinding wheel grinds the tire ring belt so that the rubber with the flocculent structure on the surface of the tire ring belt forms rubber powder separated from the tire ring belt. Such processing will not damage the wire layer in the tire, so that the rubber powder obtained by the processing contains very few iron filings and impurities, and there is no need to perform magnetic separation and iron removal in the conventional process.

[0013] The kinetic energy of the water jet is extremely large. When the rubber on the tire ring is crushed, the heat energy from the destruction of chemical bonds and the heat energy from the kinetic energy conversion will cause the temperature of the rubber powder to be relatively high. In addition, due to the small particle size of the rubber powder, the rubber powder particles are also very easy to agglomerate. By mixing the prepared rubber powder with water or putting it into a collection container filled with water, on the one hand, the water flow is used to quickly cool the rubber powder, and on the other hand, the hydrophobicity of the rubber powder surface is used to break up the rubber powder with the water flow, making it less likely for the rubber powder to agglomerate.

[0014] Step 2 includes the following steps in sequence:

[0015] Step 2.1, a crushing water jet applies a water jet to the tire ring belt, wherein the crushing water jet cuts the surface of the tire ring belt into a flocculent rubber structure that is not separated from the tire ring belt;

[0016] Step 2.2: The grinding assembly grinds the flocculent rubber structure on the surface of the tire ring.

[0017] Through the above technical scheme, waste tires can be efficiently used for rubber powder processing by sequentially adopting water jet and grinding, and the obtained rubber powder has low iron filings impurity content.

[0018] The method for producing rubber powder using waste tires also includes the following steps: step 3, removing impurities from the rubber powder;

[0019] Step 3 includes the following steps in sequence:

[0020] Step 3.1, putting the rubber powder into a collection container containing water;

[0021] Step 3.2, using a magnetic separator to magnetically separate and remove iron from the rubber powder;

[0022] Step 3.3, draining and drying the rubber powder.

[0023] Through the above technical solution, the rubber powder obtained by magnetic separation and iron removal of the rubber refined powder has low iron impurity content.

[0024] The method for manufacturing rubber powder from waste tires also comprises the following steps:

[0025] Step 4, freezing and crushing the rubber powder to obtain fine rubber powder;

[0026] Step 4 includes the following steps in sequence:

[0027] Step 4.1, putting the rubber powder into an environment of -130°C to -70°C for mechanical crushing to obtain secondary rubber powder with a particle size range of 100 μm to 500 μm;

[0028] Step 4.2, the secondary rubber powder is sequentially put into a pre-freezing bin for pre-freezing, the pre-freezing temperature is -60°C to -30°C, and the time is 20s to 200s;

[0029] Step 4.3, putting the pre-frozen secondary rubber powder into a deep freezing chamber for deep freezing, the deep freezing temperature is -196°C to -80°C, and the time is 60s to 200s;

[0030] Step 4.4: Grind the secondary rubber powder after deep freezing to obtain the fine rubber powder.

[0031] Through the above technical solution, in a low temperature environment of -130℃ to -70℃, the molecular movement of rubber is almost completely stopped, and the material becomes extremely hard and brittle. The rubber in this state is easy to break when subjected to impact or pressure. At this time, the crushing process requires less energy, thereby effectively improving the crushing efficiency. In addition, low-temperature crushing reduces the heat generated by friction, avoids the risk of pyrolysis or oxidation of rubber due to friction heat, and maintains the chemical stability of rubber powder. After the initial crushing of the rubber is completed at -130℃ to -70℃, the rubber powder is pre-cooled by placing it at -60℃ to -30℃. Freezing, the pre-cooling temperature is higher than the temperature during mechanical crushing. At this time, the molecular movement of the rubber is restored, the material recovers some toughness, and due to the release of stress, the molecular chain of the rubber is elongated; after pre-freezing, the rubber powder is deep-frozen. The instantaneous temperature difference between deep freezing and pre-freezing breaks the elongated rubber molecular chain, and in an environment of -196℃ to -80℃, the rubber undergoes rapid crystallization. At this time, the secondary rubber powder is crushed by grinding, which can not only obtain more delicate rubber powder, but also rearrange the molecular chain of the rubber powder to improve the mechanical properties of the material.

[0032] In step 4.2, the temperature of the pre-freezing bin of the secondary rubber powder is gradually reduced from the feed end to the discharge end, with a temperature difference of 10°C to 15°C at each stage, and the processing time is gradually shortened, with a time difference of 30s to 60s at each stage.

[0033] Through the above technical scheme, by gradually lowering the temperature, the rubber powder can be cooled more evenly, avoiding internal stress or uneven crystallization caused by too rapid temperature changes; the temperature difference control of 10°C to 15°C at each stage helps the rubber powder to reach different physical states at different stages, helps to promote the orderly arrangement of rubber molecular chains, and improves the crystallization quality; the time difference control of 30s to 60s at each stage can ensure that the rubber powder has enough time for molecular rearrangement and crystallization at each temperature stage, while preventing prolonged exposure to a certain temperature from causing material performance degradation; as the temperature decreases, the crystallization rate of the rubber powder gradually increases, so gradually shortening the processing time can avoid excessive crystallization or excessive arrangement of molecular chains, and the crystallization process of the rubber powder is optimized by gradually reducing the temperature and time control, so that it forms more uniform and finer crystals at different temperatures, thereby improving the physical properties of the rubber powder.

[0034] In step 2, the grinding assembly comprises a grinding wheel, and the grinding wheel applies a pressure on the tire annulus, wherein the pressure is 7000N to 10000N.

[0035] Through the above technical solution, the grinding effect of the grinding wheel on the flocculent structure rubber on the tire ring belt is controlled by controlling the pressure value applied by the grinding wheel to the tire ring belt.

[0036] In step 2, the intensity of the water jet of the crushing water knife is 280MPa to 400MPa, and the target distance of the crushing water knife is 15mm to 50mm.

[0037] Through the above technical solution, the intensity and target distance of the water jet are controlled, thereby ensuring that the water jet has a good crushing effect on the tire ring.

[0038] In step 2, the tire ring belt is circumferentially rotated at a speed of 500 mm / min to 1500 mm / min.

[0039] Through the above technical scheme, when the movement speed of the tire ring belt is too fast, the contact time between the water jet and the tire ring belt cutting unit is too short, and the surface of the tire ring belt cannot be cut and crushed well; when the movement speed of the tire ring belt is too slow, the contact time between the water jet and the tire ring belt cutting unit is too long, which will cause the cutting depth to be too large and damage the wire mesh, introduce iron filings and impurities, and also cause local overheating, affecting the physical and chemical properties of the rubber powder; by controlling and adjusting the movement speed of the tire ring belt, the processing efficiency and processing quality of the rubber powder crushing can be fully coordinated when processing the tire ring belt.

[0040] In step 2, the grinding assembly includes a grinding wheel, and the outer peripheral surface of the grinding wheel is provided with a diamond pattern or straight stripes along the axis direction of the grinding wheel.

[0041] According to the technical solution, diamond patterns or straight stripes are provided on the surface of the grinding wheel, thereby increasing the friction coefficient of the grinding wheel surface, and thus when the tire ring moves, the flocculent rubber on the surface of the tire ring can be well ground.

[0042] In step 2, the grinding assembly includes a grinding wheel, and the rotation direction of the grinding wheel is opposite to the rotation direction of the tire annulus.

[0043] The above technical solution is more conducive to grinding and cutting flocculent rubber to obtain rubber powder.

[0044] In step 2, the mass fraction of rubber powder with a mesh size of 200 to 300 is 65%-95%.

[0045] Through the above technical solution, the rubber powder is finer.

[0046] In step 1, a clamping device is provided to clamp the outer ring of the waste tire or a supporting device is provided to support the inner ring of the waste tire; the clamping device or the supporting device is driven to rotate by a driving device to make the waste tire rotate. When the waste tire rotates, a cutting water jet parallel to the axis of the waste tire is used to align with the joint position of the sidewall and the shoulder of the tire, and the sidewall and the shoulder of the tire are separated under the action of the water jet ejected by the cutting water jet.

[0047] Through the above technical solution, the tire is rotated and the water jet of the water jet is used to cut and separate the sidewall and shoulder of the tire, which is efficient, convenient, green and environmentally friendly.

[0048] In step 3.1, when the rubber powder is put into a collection container containing water, a stirring device and an ultrasonic oscillation device are provided in the collection container.

[0049] Through the above technical solution, the rubber powder can be broken up more efficiently and effectively through mechanical stirring and ultrasonic vibration, so that the rubber powder particles are not easy to agglomerate.

[0050] A device for manufacturing rubber powder from waste tires. The method for manufacturing rubber powder from waste tires adopts the device for manufacturing rubber powder from waste tires. The device for manufacturing rubber powder from waste tires comprises a cutting device and a water jet crushing device.

[0051] The cutting device can cut and separate the waste tire from the sidewall and the shoulder;

[0052] The water jet pulverizing device comprises a grinding component, a water jet component, a transmission drive component and a plurality of supporting rollers;

[0053] The tire belt can be sleeved outside the multiple supporting rollers, the multiple supporting rollers can tension the tire belt, and the transmission drive assembly can drive the tire belt to rotate circumferentially through the supporting rollers;

[0054] The water jet assembly includes a crushing water jet, which can apply a water jet to the tire ring belt and cut the surface of the tire ring belt into a flocculent rubber structure that is not separated from the tire ring belt;

[0055] The grinding assembly comprises a grinding wheel, and the grinding wheel can grind the floc-like rubber structure on the surface of the tire ring.

[0056] Through the above technical scheme, the supporting component or the clamping component is driven to rotate by the rotating driving component, so that the moving trajectory of the cutting water knife relative to the tire is a regular circle, and then the water jet of the cutting water knife is used to separate the wheel side and the tire shoulder, so as to keep the shape of the tire ring belt regular and easy to install; further, the tire ring belt is sleeved on the supporting roller shaft, and the tire ring belt is tensioned by the supporting roller shaft, and then the grinding wheel is positioned so that the grinding wheel and the tire ring belt are in conflict; when the tire ring belt is driven to move between the grinding wheel and the supporting roller shaft by the transmission driving component, the high-pressure water jet ejected by the crushing water knife The surface of the tire ring belt is crushed so that the rubber material on the surface of the tire ring belt forms a floc structure that is not separated from the wire mesh, and then the rubber powder is gradually separated from the tire ring belt through the grinding effect of the grinding wheel on the tire ring belt; the device performs preliminary crushing of the tire ring belt through a water knife, so that the rubber material on the surface of the tire ring belt forms a floc structure that is not separated from the wire mesh, and then the rubber powder is separated from the wheel ring belt by abrasion, and it is not easy to damage the wire mesh, and the iron filings impurity content in the rubber powder is low, and only one step of magnetic separation treatment is required to obtain rubber powder with extremely low iron content, thereby effectively improving the production efficiency of rubber powder.

[0057] The cutting device is a water jet cutting device, which comprises a tire fixing assembly, a cutting water jet and a driving assembly. The tire fixing assembly is a clamping assembly or a supporting assembly. The clamping assembly can clamp and fix the outer ring of the waste tire, the supporting assembly can support and fix the inner ring of the waste tire, the cutting water jet can cut the waste tire, and the driving assembly can drive the tire fixing assembly to rotate.

[0058] The water jet pulverizing device comprises a frame, the transmission drive assembly and a plurality of supporting rollers are all located on the frame, the plurality of supporting rollers are arranged at intervals in the left-right direction, and the axes of the plurality of supporting rollers extend in the front-back direction.

[0059] The water jet crushing device also includes a lifting frame, the multiple supporting rollers include two movable rollers and a plurality of fixed rollers, the two movable rollers are arranged at intervals on the left and right, the plurality of fixed rollers are located between the two movable rollers, the movable rollers can move in the left and right directions and tighten the tire ring belt, the transmission drive assembly is connected to the movable rollers, the axis of the grinding wheel extends in the front and rear directions, the grinding assembly and the lifting frame are located above the multiple supporting rollers, the end of the grinding wheel is located in the lifting frame, and the grinding assembly and the lifting frame can move up and down synchronously.

[0060] The two water jet assemblies are arranged at intervals on the left and right, and the two water jet assemblies are both located above the multiple supporting rollers and between the two water jet assemblies of the grinding assembly. The water jet assembly also includes a mounting seat, a mounting slider, a screw and a linear guide rod. The crushing water jet, the mounting seat and the mounting slider are connected in sequence, and the screw and the linear guide rod both extend in the front-to-back direction. The screw and the linear guide rod both pass through the mounting slider, and the screw is connected to a servo motor. The crushing water jet, the mounting seat and the mounting slider can all move back and forth in the front-to-back direction.

[0061] The beneficial effects of the present invention are as follows: the method for manufacturing rubber powder using waste tires combines water jet crushing and grinding crushing, can efficiently utilize waste tires for rubber powder processing, and the prepared rubber powder has a low iron filings impurity content. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0063] Figure 1 It is a cross-sectional schematic diagram of a waste tire.

[0064] Figure 2 It is a schematic diagram of the waste tire after it is separated from the sidewall and shoulder.

[0065] Figure 3 It is a structural schematic diagram of an implementation manner of the water jet cutting device.

[0066] Figure 4 It is a structural schematic diagram of another embodiment of the water jet cutting device.

[0067] Figure 5 It is a front stereoscopic schematic diagram of the water jet pulverizing device.

[0068] Figure 6 It is a rear perspective schematic diagram of the water jet pulverizing device.

[0069] Figure 7 is a schematic diagram of the water jet assembly.

[0070] Figure 8 It is a schematic diagram of the usage state of the water jet pulverizing device.

[0071] Fig. 9 It is a schematic diagram of the particle size analysis curve of the rubber powder prepared in Example 7 by a CPS disk centrifuge.

[0072] Fig.10 It is a schematic diagram of the particle size analysis curve of the rubber powder prepared in Example 7 by a CPS disk centrifuge.

[0073] Explanation of reference numerals:

[0074] 1, three-jaw chuck; 2, reduction drive motor; 3, robotic arm; 4, cutting water jet; 5, clamping assembly; 6, workbench; 7, frame; 8, lifting frame; 9, water jet assembly; 10, grinding assembly; 11, waste tire;

[0075] 101, arc-shaped support plate;

[0076] 51, fixed limit wheel; 52, movable limit wheel; 53, drive wheel; 54, rotation drive motor; 55, swing arm; 56, bolt handle;

[0077] 61, positioning column;

[0078] 71, movable roller shaft; 72, fixed roller shaft; 73, tensioning slider; 74, adjusting hydraulic cylinder; 75, direct drive reduction motor;

[0079] 81, lifting hydraulic cylinder; 82, guide post; 83, adjusting slider; 84, guide shaft; 85, buffer spring;

[0080] 91, crushing water jet; 92, mounting seat; 93, mounting slider; 94, screw; 95, linear guide rod; 96, servo motor;

[0081] 1001, grinding wheel;

[0082] 1101, tire sidewall; 1102, tire shoulder; 1103, tire belt; 1104, outer ring; 1105, inner ring; 1106, tread. Detailed implementation manners

[0083] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0084] For the convenience of understanding and description, absolute positional relationships are adopted in the following description of the present invention. Unless otherwise specified, the orientation word "upper" herein means Figure 8 the upper side direction in Figure 8In the downward direction, the azimuth term "left" refers to Figure 8 the left direction in, and the azimuth term "right" refers to Figure 8 the right direction in. The azimuth term "front" refers to the direction perpendicular to Figure 8 the paper surface of and pointing to the inner side of the paper surface, and the azimuth term "rear" refers to the direction perpendicular to Figure 8 the paper surface of and pointing to the outer side of the paper surface. The present invention is described from the observation perspective of the reader or user, but the above azimuth terms should not be understood or construed as limiting the protection scope of the present invention. Regarding the dimensions and angles of the components therein, those skilled in the art can specifically determine them according to actual needs or through a limited number of tests.

[0085] As Figure 1 , Figure 2 and Figure 8 shown, a method for manufacturing rubber fine powder from waste tires according to an embodiment of the present invention successively includes the following steps:

[0086] Step 1: Separate the waste tire 11 between the tire side 1101 and the tire shoulder 1102 to obtain a tire annulus 1103 containing the tread 1106 and the tire shoulder 1102;

[0087] Step 2: Keep the tire annulus 1103 in a tensioned state, make the tire annulus 1103 rotate circumferentially in a cycle, the crushing water knife 91 reciprocates axially along the tire annulus 1103, the crushing water knife 91 applies a water jet to the tire annulus 1103, and cuts out a flocculent rubber structure on the surface of the tire annulus 1103 that is not separated from the tire annulus 1103; the grinding assembly 10 grinds the flocculent rubber structure on the surface of the tire annulus 1103 to form rubber fine powder separated from the tire annulus 1103.

[0088] Through the above technical solution, by removing the tire side of the tire, the part of the tire processed by the water jet becomes a regular annulus state; further, when the tire annulus is sleeved on a bracket provided with a plurality of support roller shafts, the tire annulus can be well tensioned, so that the wheel belt annulus is in a stable tensioned state; and when the support roller shafts and / or the grinding wheels drive the tire annulus to perform a circumferential cyclic motion, the tire annulus can move in a stable and controllable state and trajectory, thereby realizing the process control of the water jet device for crushing the tire annulus to achieve a high-quality, stable and controllable rubber powder form;

[0089] When the tire ring belt circulates between the grinding wheel and the supporting roller, the position and parameters of the water jet device are set so that the water jet device generates a water jet to crush the surface of the tire ring belt. The rubber material on the surface of the tire ring belt forms a flocculent structure that is not separated from the wire mesh. Then, the grinding wheel grinds the tire ring belt so that the rubber with the flocculent structure on the surface of the tire ring belt forms rubber powder separated from the tire ring belt. Such processing will not damage the wire layer in the tire, so that the rubber powder obtained by the processing contains very few iron filings and impurities, and there is no need to perform magnetic separation and iron removal in the conventional process.

[0090] The kinetic energy of the water jet is extremely large. When the rubber on the tire ring is crushed, the heat energy from the destruction of chemical bonds and the heat energy from the kinetic energy conversion will cause the temperature of the rubber powder to be relatively high. In addition, due to the small particle size of the rubber powder, the rubber powder particles are also very easy to agglomerate. By mixing the prepared rubber powder with water or putting it into a collection container filled with water, on the one hand, the water flow is used to quickly cool the rubber powder, and on the other hand, the hydrophobicity of the rubber powder surface is used to break up the rubber powder with the water flow, making it less likely for the rubber powder to agglomerate.

[0091] In step 2, if Figure 1 and Figure 8 As shown, the tire belt 1103 is stretched to form a runway-shaped structure, the tire belt 1103 is in a tensioned state, the tire belt 1103 circulates in a circumferential direction (which can be understood as being similar to the circumferential rotation of a conveyor belt), the grinding assembly 10 includes a grinding wheel 1001, the grinding wheel 1001 applies pressure to the tire belt 1103, the grinding assembly 10 grinds the outer peripheral surface (the surface with tire tread) of the tire belt 1103, the water jet assembly 9 includes a crushing water knife 91, the crushing water knife 91 hydraulically cuts and crushes the outer peripheral surface of the tire belt 1103, and the crushing water knife 91 reciprocates along the axial direction of the tire belt 1103. Alternatively, the grinding assembly 10 can also adopt other existing grinding and cutting devices capable of cutting rubber.

[0092] In step 2, the surface of the tire ring belt 1103 is crushed by a water jet, so that the rubber material on the surface of the tire ring belt forms a floc structure that is not separated from the wire mesh; at the same time, the grinding wheel of the grinding assembly 10 is driven to make the tire ring belt 1103 circulate circumferentially between the grinding wheel and the supporting roller shaft, and the rubber in the floc structure on the surface of the tire ring belt is worn away by the grinding wheel to form rubber powder separated from the tire ring belt.

[0093] In step 2, the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 7000N to 10000N. By controlling the pressure value applied by the grinding wheel to the tire ring belt, the grinding effect of the grinding wheel on the floc-structured rubber on the tire ring belt is controlled.

[0094] In step 2, the water jet intensity of the crushing water jet 91 is 280MPa to 400MPa, and the target distance of the crushing water jet 91 (i.e., the distance between the crushing water jet 91 and the tire ring band 1103) is 15mm to 50mm. By controlling the intensity and target distance of the water jet, it is ensured that the water jet has a good crushing effect on the tire ring band.

[0095] In step 2, the circumferential rotation speed of the tire belt 1103 is 500 mm / min to 1500 mm / min. When the movement speed of the tire belt is too fast, the contact time between the water jet and the tire belt cutting unit is too short, and the surface of the tire belt cannot be cut and crushed well; when the movement speed of the tire belt is too slow, the contact time between the water jet and the tire belt cutting unit is too long, which will cause the cutting depth to be too large and damage the wire mesh, introduce iron filings and impurities, and also cause local overheating, affecting the physical and chemical properties of the rubber powder; by controlling and adjusting the movement speed of the tire belt, the processing efficiency and processing quality of the rubber powder crushing can be fully coordinated when processing the tire belt.

[0096] In step 2, the mass fraction of rubber powder with mesh size of 200 to 300 is 65%-95%. Compared with the prior art, the present invention can obtain rubber powder with better quality by adopting the above steps 1 and 2.

[0097] While the tire annulus 1103 is circumferentially rotating, step 2 includes the following steps in sequence:

[0098] Step 2.1, the crushing water jet 91 hydraulically cuts and crushes the tire ring belt 1103;

[0099] Step 2.2: The grinding assembly 10 grinds the tire ring belt 1103 .

[0100] The method for producing rubber powder using waste tires also includes the following: Step 3, removing impurities from the rubber powder; Step 3 sequentially includes the following steps:

[0101] Step 3.1, putting the rubber powder into a collection container containing water;

[0102] Step 3.2, using a magnetic separator to perform magnetic separation and iron removal on the rubber powder to obtain water-containing rubber powder;

[0103] Step 3.3, draining and drying the water-containing rubber powder to obtain (dry) rubber powder.

[0104] In step 3.1, when the rubber powder is put into the collection container containing water, a stirring device and an ultrasonic vibration device are provided in the collection container. The rubber powder is dispersed more efficiently and effectively through mechanical stirring and ultrasonic vibration, so that the rubber powder particles are not easy to agglomerate.

[0105] The method for producing rubber powder from waste tires also includes the following steps of fine processing:

[0106] Step 4, freezing and crushing the (dried) rubber powder to obtain fine rubber powder;

[0107] The step 4 comprises the following steps in sequence:

[0108] Step 4.1, putting the rubber powder into an environment of -130°C to -70°C for mechanical crushing to obtain secondary rubber powder with a particle size range of 100 μm to 500 μm;

[0109] Step 4.2, the secondary rubber powder is sequentially put into a pre-freezing bin for pre-freezing, the pre-freezing temperature is -60°C to -30°C, and the pre-freezing time is 20s to 200s;

[0110] Step 4.3, putting the pre-frozen secondary rubber powder into a deep freezing chamber for deep freezing, the deep freezing temperature is -196°C to -80°C, and the deep freezing time is 60s to 200s;

[0111] Step 4.4: Grind the secondary rubber powder after deep freezing to obtain the fine rubber powder.

[0112] Through the above technical solution, in a low temperature environment of -130℃ to -70℃, the molecular movement of rubber is almost completely stopped, and the material becomes extremely hard and brittle. The rubber in this state is easy to break when subjected to impact or pressure. At this time, the crushing process requires less energy, thereby effectively improving the crushing efficiency. In addition, low-temperature crushing reduces the heat generated by friction, avoids the risk of pyrolysis or oxidation of rubber due to friction heat, and maintains the chemical stability of rubber powder. After the initial crushing of the rubber is completed at -130℃ to -70℃, the rubber powder is pre-frozen by placing it at -60℃ to -30℃. The pre-cooling temperature is higher than the temperature during mechanical crushing. At this time, the molecular movement of the rubber is restored, the material recovers some toughness, and due to the release of stress, the molecular chain of the rubber is elongated; after pre-freezing, the rubber powder is deep-frozen. The instantaneous temperature difference between deep freezing and pre-freezing breaks the elongated rubber molecular chain, and in an environment of -196℃ to -80℃, the rubber undergoes rapid crystallization. At this time, the secondary rubber powder is crushed by grinding, which can not only obtain more delicate rubber powder, but also rearrange the molecular chain of the rubber powder to improve the mechanical properties of the material.

[0113] In step 3.2, the temperature of the pre-freezing bin of the secondary rubber powder is gradually reduced from the feed end to the discharge end, with a temperature difference of 10°C to 15°C at each stage, and the processing time is gradually shortened, with a time difference of 30s to 60s at each stage.

[0114] By gradually lowering the temperature, the rubber powder can be cooled more evenly, avoiding internal stress or uneven crystallization caused by rapid temperature changes; the temperature difference control of 10℃ to 15℃ at each stage helps the rubber powder reach different physical states at different stages, helps promote the orderly arrangement of rubber molecular chains, and improves the crystallization quality; the time difference control of 30s to 60s at each stage can ensure that the rubber powder has enough time for molecular rearrangement and crystallization at each temperature stage, while preventing prolonged exposure to a certain temperature from causing material performance degradation; as the temperature decreases, the crystallization rate of the rubber powder gradually increases, so gradually shortening the processing time can avoid excessive crystallization or excessive arrangement of molecular chains, and by gradually reducing the temperature and time control, the crystallization process of the rubber powder is optimized, so that it forms more uniform and finer crystals at different temperatures, thereby improving the physical properties of the rubber powder.

[0115] The following describes a device for producing rubber powder from waste tires. The method for producing rubber powder from waste tires adopts the device for producing rubber powder from waste tires. The device for producing rubber powder from waste tires includes a cutting device and a water jet crushing device; the cutting device can cut the waste tire 11 from between the sidewall 1101 and the shoulder 1102 ( Figure 1 The water jet crushing device comprises a grinding assembly 10, a water jet assembly 9, a transmission drive assembly and a plurality of support rollers; the tire ring belt 1103 can be sleeved outside the plurality of support rollers, the plurality of support rollers can tension the tire ring belt 1103, and the transmission drive assembly can drive the tire ring belt 1103 to rotate circumferentially through the support rollers; the water jet assembly 9 comprises a crushing water knife 91, the crushing water knife 91 can apply a water jet to the tire ring belt 1103, and cut the surface of the tire ring belt 1103 into a flocculent rubber structure that is not separated from the tire ring belt 1103; the grinding assembly 10 comprises a grinding wheel 1001, and the grinding wheel 1001 can grind the flocculent rubber structure on the surface of the tire ring belt 1103.

[0116] The cutting device is a water jet cutting device, which includes a tire fixing assembly, a cutting water jet 4 and a driving assembly. The tire fixing assembly is a clamping assembly (which may be referred to as a clamping and fixing assembly) or a supporting assembly (which may be referred to as a supporting and fixing assembly). The clamping assembly can clamp and fix the outer ring 1104 of the waste tire 11, and the supporting assembly can support and fix the inner ring 1105 of the waste tire 11. The cutting water jet 4 can cut the waste tire 11, and cut the waste tire 11 into a tire ring 1103 and two sidewalls 1101. The driving assembly can drive the tire fixing assembly and the waste tire 11 to rotate.

[0117] For example, Figure 3 As shown, the cutting device (i.e., water jet cutting device) can be a horizontal structure, and the cutting device includes a three-jaw chuck 1, a reduction drive motor 2 for driving the three-jaw chuck 1 to rotate, a mechanical arm 3, and a cutting water jet 4. The three-jaw chuck 1 can be used as a supporting device or a clamping device, and an arc-shaped support plate 101 is fixed on the clamping claws of the three-jaw chuck 1. The mechanical arm 3 includes at least one swinging degree of freedom in a plane parallel to the end face of the tire, and the cutting water jet 4 is clamped and fixed on the end effector of the mechanical arm 3.

[0118] When using a water jet cutting device to cut and remove the sidewall of a tire, the tire is placed on the arc-shaped support plate 101 of the three-jaw chuck 1, and the inner ring of the tire is supported by the claws of the three-jaw chuck 1. The three-jaw chuck 1 is driven to rotate by the reduction drive motor 2, thereby driving the tire to rotate around its axis. The cutting water jet 4 is moved to the connection between the sidewall and the shoulder of the tire by the mechanical arm 3, and the water jet sprayed by the cutting water jet 4 is perpendicular to the end face of the tire. During the rotation of the tire, the water jet sprayed by the cutting water jet 4 cuts the tire, and the sidewall and shoulder of the tire are efficiently separated.

[0119] Or, if Figure 4 As shown, the cutting device (i.e., water jet cutting device) can also be a vertical structure, and the cutting device adopts a clamping assembly 5 to position the tire. The clamping assembly 5 includes a fixed limiting wheel 51, a movable limiting wheel 52 and a driving wheel 53. The water jet cutting device also includes a workbench 6, and the workbench 6 is fixed with a positioning column 61. The diameter of the positioning column 61 is slightly smaller than the inner ring of the tire, so that the tire can be easily mounted on the positioning column 61. The centers of the fixed limiting wheel 51 and the driving wheel 53 are located on the same circle with the positioning column 61 as the center. The fixed limiting wheel 51 and the driving wheel 53 are rotatably connected to the workbench 6. A rotating drive motor 54 is arranged at the driving wheel 53, and the body of the rotating drive motor 54 is fixedly connected to the workbench 6, and the output shaft of the rotating drive motor 54 is coaxially arranged and fixedly connected to the driving wheel 53.

[0120] A clamping device is set to clamp the outer ring of the tire or a supporting device is set to support the inner ring of the tire; the clamping device or the supporting device is driven to rotate by a driving device to make the tire rotate around its axis. When the tire rotates, a water knife parallel to the axis of the tire is used to align the joint position of the sidewall and the shoulder of the tire, and the sidewall and the shoulder of the tire are separated under the action of the water jet ejected by the water knife. By rotating the tire, the water jet of the water knife jet is used to cut and separate the sidewall and the shoulder of the tire, which is efficient, convenient, and environmentally friendly.

[0121] like Figure 4 As shown, the movable limiting wheel 52 is rotatably connected to a swing arm 55, and the other end of the swing arm 55 is rotatably connected to the workbench 6. A brake assembly for positioning the swing arm 55 is provided on the swing arm 55. In this embodiment, the brake assembly adopts a bolt handle 56, which axially passes through the swing arm 55 and is threadedly connected to the swing arm 55. By screwing the bolt handle 56, the bolt handle 56 is pressed against the table surface of the workbench 6, thereby positioning the swing arm 55. The positioning method of the cutting water jet 4 can be adopted Figure 2 In the above method, other positioning methods can also be used. The technical purpose is only to move the cutting water jet 4 to the connection between the sidewall and the shoulder of the tire, which will not be described here. When the tire is cut by water jet, the tire is placed on the positioning column 61 so that the tread of the tire is tangent to the fixed limiting wheel 51 and the driving wheel 53 respectively. The swing arm 55 is swung to make the movable limiting wheel 52 contact the tire, and then the swing arm 55 is positioned. The rotating drive motor 54 is started, and the tire is rotated around its axis under the action of the driving wheel 53, and then the sidewall and the shoulder of the tire are separated by the water jet ejected by the cutting water jet 4.

[0122] like Figure 5 , Figure 6 and Figure 7 As shown, the water jet crushing device includes a frame 7, the transmission drive assembly and multiple support rollers are located on the frame 7, the multiple support rollers are arranged at intervals in the left-right direction, the axes of the multiple support rollers extend in the front-back direction, the tire ring belt 1103 can be mounted outside the multiple support rollers, and the transmission drive assembly can drive the support rollers and the tire ring belt 1103 to rotate.

[0123] The multiple supporting rollers include two movable rollers 71 and several (such as three) fixed rollers 72. The two movable rollers 71 are arranged at intervals on the left and right, and the several fixed rollers 72 are all located between the two movable rollers 71. The movable rollers 71 can move in the left and right directions and tighten the tire ring belt 1103. The transmission drive assembly is connected to the movable rollers 71. The axis of the grinding wheel 1001 extends in the front and back directions. The grinding assembly 10 and the lifting frame 8 are located above the multiple supporting rollers. The end of the grinding wheel 1001 is located in the lifting frame 8. The grinding assembly 10 and the lifting frame 8 can move up and down synchronously.

[0124] The two ends of the movable roller shaft 71 are rotatably connected with the tensioning slider 73, and the tensioning slider 73 is slidably connected with the frame 7 along the length direction of the frame 7. The transmission drive assembly includes a direct drive reduction motor 75, which is used to drive the movable roller shaft 71 to rotate. The body of the direct drive reduction motor 75 is fixedly connected with the tensioning slider 73; the output shaft of the direct drive reduction motor 75 is coaxially arranged and fixedly connected with the movable roller shaft 71. The two ends of the fixed roller shaft 72 are rotatably connected with the frame 7. Each fixed roller shaft 72 can use a driving motor, using belt drive or chain drive, or can use unpowered drive, that is, it rotates under the action of the transmission object. The frame 7 is provided with an adjustment hydraulic cylinder 74 for driving the tensioning slider 73. The position of the movable roller shaft 71 is adjusted by adjusting the piston rod of the hydraulic cylinder 74 to be extended and retracted.

[0125] Before installing the tire ring belt, the two fixed rollers are in a close state, so that it is convenient for the staff to put the tire ring belt on each supporting roller shaft; after the tire ring belt is installed on the supporting roller shaft, the movable roller shaft is driven to move in the direction away from each other, thereby tensioning the tire ring belt mounted on the supporting roller shaft, so that the tire ring belt maintains a good tension state.

[0126] like Figure 5 , Figure 6 and Figure 7 As shown, the lifting frame 8 is located above the supporting roller shaft, and the grinding wheel 1001 and the water jet assembly 9 are installed on the lifting frame 8. A lifting hydraulic cylinder 81 is provided on the frame 7, and the cylinder body of the lifting hydraulic cylinder 81 is fixedly connected to the frame 7, and the piston rod of the lifting hydraulic cylinder 81 is fixedly connected to the lifting frame 8. The lifting frame 8 is lifted and lowered in the vertical direction by the extension and retraction of the piston rod of the lifting hydraulic cylinder 81. A plurality of vertically arranged guide posts 82 are fixed on the frame 7, and the guide posts 82 axially penetrate the lifting frame 8. The guide posts 82 are used to guide the lifting frame 8 when it moves, so that the movement state of the lifting frame 8 is more stable.

[0127] The lifting frame is lifted and lowered, and the grinding wheel on the lifting frame is moved away from or close to the supporting roller. When the grinding wheel is close to the supporting roller, the grinding wheel compresses the buffer spring under the action of gravity, and then contacts the tire ring belt, exerting a force on the tire ring belt, so that when the tire ring belt passes through the grinding wheel, a good grinding effect can be achieved on the flocculent rubber on the surface of the tire ring belt.

[0128] The surface of the grinding wheel 1001 is provided with diamond patterns or straight stripes along the axis direction of the grinding wheel 1001, so that the surface of the grinding wheel 1001 has a large friction coefficient, and thus when the tire ring moves, the flocculent rubber on the surface of the tire ring can be well ground.

[0129] like Figure 5 and Figure 6 As shown, the two ends of the grinding wheel 1001 are rotatably mounted with adjusting sliders 83, and the lifting frame 8 at the lower part of the adjusting slider 83 is fixed with a guide shaft 84, and the guide shaft 84 is sleeved with a buffer spring 85, and the two ends of the buffer spring 85 are respectively in contact with the adjusting slider 83 and the lifting frame 8. The grinding wheel 1001 can be driven by power or without power. When the grinding wheel 1001 is driven, that is, the grinding assembly 10 also contains a rotary drive motor, which can drive the grinding wheel 1001 to rotate (the grinding wheel 1001 rotates with the axis of the grinding wheel 1001 itself as the axis), and the rotation direction of the grinding wheel 1001 is opposite to the rotation direction of the supporting roller shaft, and the linear speed of the grinding wheel 1001 is less than the linear speed of the supporting roller shaft, so that a good grinding effect can be achieved on the flocculent rubber after the surface of the tire ring belt is broken.

[0130] like Figure 5 , Figure 6 and Figure 7 As shown, two water jet assemblies 9 are arranged at intervals on the left and right, and the two water jet assemblies 9 are both located above the multiple support rollers and between the two water jet assemblies 9 of the grinding assembly 10. The water jet assembly 9 also contains a mounting seat 92, a mounting slider 93, a screw 94 and a linear guide rod 95 connected in sequence. The crushing water knife 91, the mounting seat 92 and the mounting slider 93 are connected in sequence. The screw 94 and the linear guide rod 95 extend in the front-to-back direction. The screw 94 and the linear guide rod 95 pass through the mounting slider 93. The screw 94 is connected to a servo motor 96. The crushing water knife 91, the mounting seat 92 and the mounting slider 93 can all move back and forth in the front-to-back direction. The crushing drive assembly drives the mounting slider to reciprocate along the axial direction of the support roller, and then the reciprocating water knife crushes the tread of the tire ring belt, and the crushing efficiency is high.

[0131] The mounting slide block 93 is provided with a screw hole for fixing the mounting seat 92, and the mounting seat 92 is provided with a long hole matched with the screw hole, and the mounting seat 92 is fixed to the mounting slide block 93 by bolt connection. By loosening the bolts, the mounting seat 92 is slid up and down, so that the height position of the mounting seat 92 can be adjusted conveniently and quickly, and the target distance of the crushing water jet 91 from the tire ring belt can be adjusted. The crushing drive assembly includes a screw 94, at least a pair of linear guide rods 95, and a servo motor 96 that drives the screw 94 to rotate. The axis of the linear guide rod 95 is arranged parallel to the support roller shaft, and the two ends of the linear guide rod 95 are fixedly connected to the lifting frame 8 respectively. The linear guide rod 95 axially penetrates the mounting slide block 93, and the mounting slide block 93 is slidably connected to the linear guide rod 95 along the axial direction of the linear guide rod 95. The screw 94 axially penetrates the mounting slide block 93 and is threadedly matched with the mounting slide block 93. The screw rod 94 is driven by the servo motor 96 to rotate forward and reverse, thereby driving the mounting slide block 93 to reciprocate in the axial direction of the supporting roller shaft, so that the tire ring belt can be efficiently crushed.

[0132] The working principles of the cutting device and the water jet crushing device are introduced below.

[0133] The tire sidewall 1101 is partially removed by using a water jet cutting device, and the tire ring belt 1103 is retained. The tire ring belt 1103 is sleeved on the support roller shaft of the frame 7, and then the adjusting hydraulic cylinder 74 is started to extend the piston rod of the adjusting hydraulic cylinder 74, so that the two movable roller shafts 71 move away from the fixed roller shaft 72, and the tire ring belt 1103 sleeved on the support roller shaft is tensioned, so that the tire ring belt 1103 is in a good and stable tension state. The piston rod of the lifting hydraulic cylinder 81 is driven to extend and retract, so that the lifting frame 8 is lowered and close to the frame 7. The grinding wheel 1001 compresses the buffer spring 85 under its own gravity, and then contacts the tire ring belt. Driven by the support roller, the tire circulates between the support roller and the grinding wheel 1001. At the same time, the servo motor 96 drives the screw 94 to rotate forward and reverse periodically, so that the mounting slider 93 drives the crushing water knife 91 to reciprocate axially along the support roller, and then the tire ring belt 1103 is crushed by the water jet ejected by the crushing water knife 91, and the surface of the tire ring belt 1103 is crushed into flocculent rubber that is not separated from the steel wire layer. Then, the grinding wheel 1001 acts on the surface of the tire ring belt 1103 to peel off the rubber powder from the tire ring belt.

[0134] The supporting assembly or the clamping assembly is driven to rotate by the rotating driving assembly, so that the moving track of the cutting water knife relative to the tire is a regular circle, and then the wheel side and the tire shoulder are separated by the water jet of the cutting water knife, so as to keep the shape of the tire ring belt regular and easy to install; the tire ring belt is further sleeved on the supporting roller shaft, and the tire ring belt is tensioned by the supporting roller shaft, and then the grinding wheel is positioned so that the grinding wheel and the tire ring belt are in conflict; when the tire ring belt is driven to move between the grinding wheel and the supporting roller shaft by the transmission driving assembly, the surface of the tire ring belt is cut by the water jet ejected by the crushing water knife The surface is crushed so that the rubber material on the surface of the tire ring belt forms a flocculent structure that is not separated from the wire mesh, and then the rubber powder is gradually separated from the tire ring belt through the grinding effect of the grinding wheel on the tire ring belt; the device performs preliminary crushing of the tire ring belt through a water knife, so that the rubber material on the surface of the tire ring belt forms a flocculent structure that is not separated from the wire mesh, and then the rubber powder is separated from the wheel ring belt by abrasion, and it is not easy to damage the wire mesh, and the iron filings impurity content in the rubber powder is low, and only one step of magnetic separation treatment is required to obtain rubber powder with extremely low iron content, thereby effectively improving the production efficiency of rubber powder.

[0135] The following describes a practical application example of the method and equipment for producing rubber powder using waste tires.

[0136] Example 1

[0137] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0138] Step 1, separating the waste tire 11 from the sidewall 1101 and the shoulder 1102 to obtain a tire ring belt 1103 including the tread 1106 and the shoulder 1102;

[0139] Step 2, the tire ring belt 1103 is in a tensioned state, and the tire ring belt 1103 is made to rotate circumferentially, the speed of the circumferential rotation of the tire ring belt 1103 is 500mm / min, the crushing water knife 91 reciprocates along the axial direction of the tire ring belt 1103, the crushing water knife 91 applies a water jet to the tire ring belt 1103, the intensity of the water jet of the crushing water knife 91 is 280MPa, the target distance of the crushing water knife 91 is 15mm, and the surface of the tire ring belt 1103 is cut into a flocculent rubber structure that is not separated from the tire ring belt 1103; the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 8000N, and the grinding wheel 1001 grinds the flocculent rubber structure on the surface of the tire ring belt 1103 to form rubber powder separated from the tire ring belt 1103;

[0140] Step 3: remove impurities (such as iron filings) from the rubber powder, drain and dry to obtain (dry) rubber powder.

[0141] Example 2

[0142] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0143] Step 1, separating the waste tire 11 from the sidewall 1101 and the shoulder 1102 to obtain a tire ring belt 1103 including the tread 1106 and the shoulder 1102;

[0144] Step 2, the tire ring belt 1103 is in a tensioned state, and the tire ring belt 1103 is made to rotate circumferentially, the speed of the circumferential rotation of the tire ring belt 1103 is 500mm / min, the crushing water knife 91 reciprocates along the axial direction of the tire ring belt 1103, the crushing water knife 91 applies a water jet to the tire ring belt 1103, the intensity of the water jet of the crushing water knife 91 is 400MPa, the target distance of the crushing water knife 91 is 15mm, and the surface of the tire ring belt 1103 is cut into a flocculent rubber structure that is not separated from the tire ring belt 1103; the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 8000N, and the grinding wheel 1001 grinds the flocculent rubber structure on the surface of the tire ring belt 1103 to form rubber powder separated from the tire ring belt 1103;

[0145] Step 3: remove impurities (such as iron filings) from the rubber powder, drain and dry to obtain (dry) rubber powder.

[0146] Example 3

[0147] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0148] Step 1, separating the waste tire 11 from the sidewall 1101 and the shoulder 1102 to obtain a tire ring belt 1103 including the tread 1106 and the shoulder 1102;

[0149] Step 2, the tire ring belt 1103 is in a tensioned state, and the tire ring belt 1103 is made to rotate circumferentially, the speed of the circumferential rotation of the tire ring belt 1103 is 500mm / min, the crushing water knife 91 reciprocates along the axial direction of the tire ring belt 1103, the crushing water knife 91 applies a water jet to the tire ring belt 1103, the intensity of the water jet of the crushing water knife 91 is 280MPa, the target distance of the crushing water knife 91 is 50mm, and the surface of the tire ring belt 1103 is cut into a flocculent rubber structure that is not separated from the tire ring belt 1103; the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 8000N, and the grinding wheel 1001 grinds the flocculent rubber structure on the surface of the tire ring belt 1103 to form rubber powder separated from the tire ring belt 1103;

[0150] Step 3: remove impurities (such as iron filings) from the rubber powder, drain and dry to obtain (dry) rubber powder.

[0151] Example 4

[0152] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0153] Step 1, separating the waste tire 11 from the sidewall 1101 and the shoulder 1102 to obtain a tire ring belt 1103 including the tread 1106 and the shoulder 1102;

[0154] Step 2, the tire ring belt 1103 is in a tensioned state, and the tire ring belt 1103 is made to rotate circumferentially, the speed of the tire ring belt 1103 is 500mm / min, the crushing water knife 91 reciprocates along the axial direction of the tire ring belt 1103, the crushing water knife 91 applies a water jet to the tire ring belt 1103, the intensity of the water jet of the crushing water knife 91 is 400MPa, the target distance of the crushing water knife 91 is 50mm, and the surface of the tire ring belt 1103 is cut into a flocculent rubber structure that is not separated from the tire ring belt 1103; the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 8000N, and the grinding wheel 1001 grinds the flocculent rubber structure on the surface of the tire ring belt 1103 to form rubber powder separated from the tire ring belt 1103;

[0155] Step 3: remove impurities (such as iron filings) from the rubber powder, drain and dry to obtain (dry) rubber powder.

[0156] Example 5

[0157] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0158] Step 1, separating the waste tire 11 from the sidewall 1101 and the shoulder 1102 to obtain a tire ring belt 1103 including the tread 1106 and the shoulder 1102;

[0159] Step 2, the tire ring belt 1103 is in a tensioned state, and the tire ring belt 1103 is made to rotate circumferentially, the speed of the tire ring belt 1103 is 1000mm / min, the crushing water knife 91 reciprocates along the axial direction of the tire ring belt 1103, the crushing water knife 91 applies a water jet to the tire ring belt 1103, the intensity of the water jet of the crushing water knife 91 is 280MPa, the target distance of the crushing water knife 91 is 15mm, and the surface of the tire ring belt 1103 is cut into a flocculent rubber structure that is not separated from the tire ring belt 1103; the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 8000N, and the grinding wheel 1001 grinds the flocculent rubber structure on the surface of the tire ring belt 1103 to form rubber powder separated from the tire ring belt 1103;

[0160] Step 3: remove impurities (such as iron filings) from the rubber powder, drain and dry to obtain (dry) rubber powder.

[0161] Example 6

[0162] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0163] Step 1, separating the waste tire 11 from the sidewall 1101 and the shoulder 1102 to obtain a tire ring belt 1103 including the tread 1106 and the shoulder 1102;

[0164] Step 2, the tire ring belt 1103 is in a tensioned state, and the tire ring belt 1103 is made to rotate circumferentially, the speed of the circumferential rotation of the tire ring belt 1103 is 1500mm / min, the crushing water knife 91 reciprocates along the axial direction of the tire ring belt 1103, the crushing water knife 91 applies a water jet to the tire ring belt 1103, the intensity of the water jet of the crushing water knife 91 is 280MPa, the target distance of the crushing water knife 91 is 15mm, and the surface of the tire ring belt 1103 is cut into a flocculent rubber structure that is not separated from the tire ring belt 1103; the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 8000N, and the grinding wheel 1001 grinds the flocculent rubber structure on the surface of the tire ring belt 1103 to form rubber powder separated from the tire ring belt 1103;

[0165] Step 3: remove impurities (such as iron filings) from the rubber powder, drain and dry to obtain (dry) rubber powder.

[0166] Example 7

[0167] In this embodiment, the rubber powder obtained in Example 1 is used as a raw material for further fine processing, that is, the method for producing rubber powder using waste tires also includes the following fine processing:

[0168] The step 4 comprises the following steps in sequence:

[0169] Step 3.1, putting the rubber powder into a -100°C environment for mechanical crushing to obtain secondary rubber powder with a particle size ranging from 100 μm to 500 μm;

[0170] Step 3.2, the secondary rubber powder is sequentially put into a pre-freezing bin for pre-freezing, the pre-freezing temperature is -60°C, and the pre-freezing time is 200s;

[0171] Step 8

[0172] In this embodiment, the rubber powder obtained in Example 1 is used as a raw material for further fine processing, that is, the method for producing rubber powder using waste tires also includes the following fine processing:

[0173] The step 4 comprises the following steps in sequence:

[0174] Step 3.1, putting the rubber powder into a -100°C environment for mechanical crushing to obtain secondary rubber powder with a particle size ranging from 100 μm to 500 μm;

[0175] Step 3.2, the secondary rubber powder is sequentially put into a plurality of pre-freezing bins for pre-freezing, the temperature of the pre-freezing bins from the feeding end to the discharging end of the secondary rubber powder is gradually reduced, and the processing time is gradually shortened, the first freezing, the ambient temperature is -30°C, the time is 120s; the second freezing is -45°C, the time is 60s; the third freezing is -60°C, the freezing time is 20s;

[0176] Step 3.3, putting the pre-frozen secondary rubber powder into a deep freezing chamber for deep freezing, the deep freezing temperature is -196°C, and the deep freezing time is 100s;

[0177] Step 3.4: Grind the secondary rubber powder after deep freezing to obtain the fine rubber powder.

[0178] Comparative Example 1

[0179] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0180] Step 1, separating the waste tire 11 from the sidewall 1101 and the shoulder 1102 to obtain a tire ring belt 1103 including the tread 1106 and the shoulder 1102;

[0181] Step 2, the tire ring belt 1103 is in a tensioned state, and the tire ring belt 1103 is made to rotate circumferentially, the speed of the circumferential rotation of the tire ring belt 1103 is 500mm / min, the crushing water knife 91 reciprocates along the axial direction of the tire ring belt 1103, the crushing water knife 91 applies a water jet to the tire ring belt 1103, the intensity of the water jet of the crushing water knife 91 is 250MPa, the target distance of the crushing water knife 91 is 13mm, and the surface of the tire ring belt 1103 is cut into a flocculent rubber structure that is not separated from the tire ring belt 1103; the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 8000N, and the grinding wheel 1001 grinds the flocculent rubber structure on the surface of the tire ring belt 1103 to form rubber powder separated from the tire ring belt 1103;

[0182] Step 3: remove impurities (such as iron filings) from the rubber powder, drain and dry to obtain (dry) rubber powder.

[0183] Comparative Example 2

[0184] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0185] Step 1, separating the waste tire 11 from the sidewall 1101 and the shoulder 1102 to obtain a tire ring belt 1103 including the tread 1106 and the shoulder 1102;

[0186] Step 2, the tire ring belt 1103 is in a tensioned state, and the tire ring belt 1103 is made to rotate circumferentially, the speed of the tire ring belt 1103 is 500mm / min, the crushing water knife 91 reciprocates along the axial direction of the tire ring belt 1103, the crushing water knife 91 applies a water jet to the tire ring belt 1103, the intensity of the water jet of the crushing water knife 91 is 450MPa, the target distance of the crushing water knife 91 is 15mm, and the surface of the tire ring belt 1103 is cut into a flocculent rubber structure that is not separated from the tire ring belt 1103; the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 8000N, and the grinding wheel 1001 grinds the flocculent rubber structure on the surface of the tire ring belt 1103 to form rubber powder separated from the tire ring belt 1103;

[0187] Step 3: remove impurities (such as iron filings) from the rubber powder, drain and dry to obtain (dry) rubber powder.

[0188] Comparative Example 3

[0189] A method for producing rubber powder using waste tires comprises the following steps in sequence:

[0190] Step 1, separating the waste tire 11 from the sidewall 1101 and the shoulder 1102 to obtain a tire ring belt 1103 including the tread 1106 and the shoulder 1102;

[0191] Step 2, the tire ring belt 1103 is in a tensioned state, and the tire ring belt 1103 is made to rotate circumferentially, the speed of the tire ring belt 1103 rotating circumferentially is 500mm / min, the crushing water knife 91 reciprocates along the axial direction of the tire ring belt 1103, the crushing water knife 91 applies a water jet to the tire ring belt 1103, the intensity of the water jet of the crushing water knife 91 is 450MPa, the target distance of the crushing water knife 91 is 60mm, and the surface of the tire ring belt 1103 is cut into a flocculent rubber structure that is not separated from the tire ring belt 1103; the pressure applied by the grinding wheel 1001 to the tire ring belt 1103 is 8000N, and the grinding wheel 1001 grinds the flocculent rubber structure on the surface of the tire ring belt 1103 to form a rubber powder separated from the tire ring belt 1103; Step 3, the rubber powder is impurity-removed, impurities (such as iron filings) are removed, and the rubber powder is drained and dried to obtain (dry) rubber powder.

[0192] Test methods

[0193] Take 1 kg of rubber powder samples prepared in Examples 1-6 and Comparative Examples 1-2 respectively, and then sieve the rubber powder samples with 20 mesh, 50 mesh, 100 mesh, 200 mesh and 300 mesh sieves respectively, calculate the weight of the rubber powder passing through the sieve holes, and calculate the mass percentage of the rubber powder passing through the sieve holes in the rubber powder sample, and the data is accurate to two decimal places. The calculation results are shown in Table 1, and the unit of mass ratio in Table 1 is %.

[0194] Table 1 Test data of sieving mass ratio of Examples 1-6 and Comparative Examples 1-3

[0195]

[0196]

[0197] It can be seen from the data in Table 1 that the rubber powder prepared by steps 1 to 3 has a particle size concentrated between 100 mesh and 200 mesh, that is, the rubber powder processed by the water jet of this scheme does not need to be subjected to secondary mechanical processing, and only needs to be screened to obtain the 50-mesh to 200-mesh rubber powder commonly used in the market. Compared with the conventional mechanical crushing method, the rubber powder can be prepared more efficiently; when the intensity of the water jet and the target concentration exceed the set range, the proportion of particles smaller than 50 mesh is significantly increased. This is because when the target distance is kept constant and the water pressure intensity is too large, the water jet will directly separate part of the uncrushed rubber powder and the cut form from the tire ring belt, thereby resulting in an increase in large particles of rubber powder. When the water flow intensity is too small, the water jet cannot have a good crushing effect on the tire ring belt, resulting in the tire ring belt not being cut through, which will also lead to an increase in large particles of rubber powder. When the target distance of the water jet is too large, the ejected water jet will inevitably produce the phenomenon of crushing position point deviation and crushing area dispersion due to the force of gravity and airflow, which will affect the crushing effect of the water jet.

[0198] The rubber powder samples obtained in Examples 1-6 and Comparative Examples 1-2 were tested for iron impurity content. The content of iron impurities in the samples was tested according to the method in GB / T 19208-2020. The specific method is as follows:

[0199] Weigh 50g of the sample using a pan balance with a sensitivity of 0.01g, place it on a non-magnetic flat surface, place a small horseshoe magnet on the sample for 60s, and then use a coarse brush to remove the adsorbed material on the horseshoe until the magnetic material adsorbed on the magnet and the brush is completely removed. Then place the removed metal debris on a balance with a sensitivity of 0.0001g for weighing and calculate the iron content (%). The calculation result is accurate to two decimal places. The test results are shown in Table 2.

[0200] Table 2 Iron content test data of Examples 1-6 and Comparative Examples 1-3

[0201]

[0202]

[0203] GB / T 19208-2020 stipulates the technical requirements for the manufacture of recycled rubber and vulcanized rubber powder for other purposes. The technical requirements for iron content are shown in Table 3.

[0204] Table 3 Iron content requirements for recycled rubber manufacturing and other uses of vulcanized rubber powder

[0205]

[0206] It can be seen from the data in Tables 1 and 2 that when the tire is crushed by the method of the present scheme, only one magnetic separation and iron removal step is required to meet the iron content requirements of all types of rubber powder, and the processing efficiency is high; referring to the comparative example, when the intensity of the water jet is greater than the critical value or the target concentration is less than the critical value, the water jet will damage the iron wire layer of the tire ring belt, and then introduce a large amount of iron filings impurities into the rubber powder, which will lead to a sudden increase in the content of the rubber powder. The iron content of the obtained rubber powder cannot meet the use requirements of specific occasions through one magnetic separation, and multiple magnetic separation and iron removal are required.

[0207] The particle size of the rubber powder obtained in Example 7 and Example 8 was analyzed by a disc centrifugal nanoparticle size analyzer, and the particle size of the rubber powder obtained in Example 7 and Example 8 was obtained. Fig. 9 and Fig.10 The particle size analysis curve of Fig. 9 is the particle size analysis curve of Example 7; Fig.10 This is the particle size analysis curve of Example 8.

[0208] analyze Fig. 9 It can be seen that the particle size range of the rubber powder particles prepared in Example 7 is highly concentrated between 20 μm and 50 μm; Fig.10 It can be seen that deep processing of the prepared rubber powder can further effectively reduce the particle size of the rubber powder, and the particle size range is highly concentrated, so that the rubber powder can be used in high-end coatings, surface modifiers and other fields that have higher requirements on the particle size of rubber particles.

[0209] In Example 8, a graded freezing method is used during pre-freezing, and the temperature of the pre-freezing bin of the secondary rubber powder is gradually reduced from the feed end to the discharge end, and the processing time is gradually shortened; Fig.10 It can be seen that the rubber powder particles prepared therein have smaller particle size and more concentrated particle size distribution, and the particle size range is highly concentrated between 6 microns and 10 microns.

[0210] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the present invention should still fall within the scope of the present invention. In addition, the technical features in the present invention can be freely combined with each other, with technical features and technical solutions, and with technical solutions.

Claims

1. A method for producing rubber powder using waste tires, characterized in that: The method for producing rubber powder using waste tires comprises the following steps in sequence: Step 1, separating the waste tire (11) from the sidewall (1101) and the shoulder (1102) to obtain a tire ring (1103) containing a tread (1106) and a shoulder (1102); Step 2: The tire ring belt (1103) is placed in a tensioned state, and the tire ring belt (1103) is rotated in a circumferential direction. The crushing water knife reciprocates along the axial direction of the tire ring belt (1103), and the crushing water knife applies a water jet to the tire ring belt (1103), and cuts the surface of the tire ring belt (1103) into a flocculent rubber structure that is not separated from the tire ring belt (1103); the grinding component grinds the flocculent rubber structure on the surface of the tire ring belt (1103) to form rubber powder that is separated from the tire ring belt (1103).

2. The method for producing rubber powder using waste tires according to claim 1, characterized in that: Step 2 includes the following steps in sequence: Step 2.1, the crushing water jet applies a water jet to the tire ring belt (1103), and the crushing water jet cuts the surface of the tire ring belt (1103) into a flocculent rubber structure that is not separated from the tire ring belt (1103); Step 2.2: The grinding assembly grinds the flocculent rubber structure on the surface of the tire hoop (1103).

3. The method for producing rubber powder using waste tires according to claim 1, characterized in that: The method for producing rubber powder using waste tires also includes the following steps: step 3, removing impurities from the rubber powder; Step 3 includes the following steps in sequence: Step 3.1, putting the rubber powder into a collection container containing water; Step 3.2, using a magnetic separator to magnetically separate and remove iron from the rubber powder; Step 3.3, draining and drying the rubber powder.

4. The method for producing rubber powder using waste tires according to claim 3, characterized in that: The method for manufacturing rubber powder from waste tires also comprises the following steps: Step 4, freezing and crushing the rubber powder to obtain fine rubber powder; Step 4 includes the following steps in sequence: Step 4.1, putting the rubber powder into an environment of -130°C to -70°C for mechanical crushing to obtain secondary rubber powder with a particle size range of 100 μm to 500 μm; Step 4.2, the secondary rubber powder is sequentially put into a pre-freezing bin for pre-freezing, the pre-freezing temperature is -60°C to -30°C, and the time is 20s to 200s; Step 4.3, putting the pre-frozen secondary rubber powder into a deep freezing chamber for deep freezing, the deep freezing temperature is -196°C to -80°C, and the time is 60s to 200s; Step 4.4: Grind the secondary rubber powder after deep freezing to obtain the fine rubber powder.

5. The method for producing rubber powder using waste tires according to claim 4, characterized in that: In step 4.2, the temperature of the pre-freezing bin of the secondary rubber powder is gradually reduced from the feed end to the discharge end, with a temperature difference of 10°C to 15°C at each stage, and the processing time is gradually shortened, with a time difference of 30s to 60s at each stage.

6. The method for producing rubber powder using waste tires according to claim 1, characterized in that: In step 2, the grinding assembly comprises a grinding wheel, and the grinding wheel applies pressure to the tire annulus (1103), wherein the pressure is 7000N to 10000N.

7. The method for producing rubber powder using waste tires according to claim 1, characterized in that: In step 2, the intensity of the water jet of the crushing water knife is 280MPa to 400MPa, and the target distance of the crushing water knife is 15mm to 50mm.

8. The method for producing rubber powder using waste tires according to claim 1, characterized in that: In step 2, the tire ring belt (1103) is circumferentially rotated at a speed of 500 mm / min to 1500 mm / min.

9. The method for producing rubber powder using waste tires according to claim 1, characterized in that: In step 2, the grinding assembly includes a grinding wheel, and the outer peripheral surface of the grinding wheel is provided with a diamond pattern or straight stripes along the axis direction of the grinding wheel.

10. The method for producing rubber powder using waste tires according to claim 1, characterized in that: In step 2, the grinding assembly includes a grinding wheel, and the rotation direction of the grinding wheel is opposite to the rotation direction of the tire annulus (1103).

11. The method for producing rubber powder using waste tires according to claim 1, characterized in that: In step 2, the mass fraction of rubber powder with a mesh size of 200 to 300 is 65%-95%.

12. The method for producing rubber powder using waste tires according to claim 1, characterized in that: In step 1, a clamping device is provided to clamp the outer ring (1104) of the waste tire (11) or a supporting device is provided to support the inner ring (1105) of the waste tire (11); the clamping device or the supporting device is driven to rotate by a driving device to make the waste tire (11) rotate. When the waste tire (11) rotates, a cutting water knife (4) parallel to the axis of the waste tire (11) is used to align with the joint position of the sidewall (1101) and the shoulder (1102). Under the action of the water jet ejected by the cutting water knife (4), the sidewall (1101) and the shoulder (1102) are separated.

13. The method for producing rubber powder using waste tires according to claim 3, characterized in that: In step 3.1, when the rubber powder is put into a collection container containing water, a stirring device and an ultrasonic oscillation device are provided in the collection container.

14. A device for producing rubber powder using waste tires, characterized in that: The equipment for manufacturing rubber powder from waste tires can be applied to the method for manufacturing rubber powder from waste tires as described in claim 1, and the equipment for manufacturing rubber powder from waste tires comprises a cutting device and a water jet crushing device; The cutting device is capable of cutting and separating the waste tire (11) between the sidewall (1101) and the shoulder (1102); The water jet pulverizing device comprises a grinding component (10), a water jet component (9), a transmission drive component and a plurality of supporting rollers; The tire belt (1103) can be sleeved outside the multiple supporting rollers, the multiple supporting rollers can tension the tire belt (1103), and the transmission drive assembly can drive the tire belt (1103) to circumferentially rotate through the supporting rollers; The water jet assembly (9) comprises a crushing water knife (91), and the crushing water knife (91) can apply a water jet to the tire ring belt (1103) and cut the surface of the tire ring belt (1103) into a flocculent rubber structure that is not separated from the tire ring belt (1103); The grinding assembly (10) contains a grinding wheel (1001), and the grinding wheel (1001) can grind the flocculent rubber structure on the surface of the tire ring belt (1103).

15. The equipment for producing rubber powder from waste tires according to claim 14, characterized in that: The cutting device is a water jet cutting device, comprising a tire fixing assembly, a cutting water jet (4) and a driving assembly, wherein the tire fixing assembly is a clamping assembly or a supporting assembly, wherein the clamping assembly can clamp and fix the outer ring (1104) of the waste tire (11), wherein the supporting assembly can support and fix the inner ring (1105) of the waste tire (11), wherein the cutting water jet (4) can cut the waste tire (11), and wherein the driving assembly can drive the tire fixing assembly to rotate.

16. The equipment for producing rubber powder from waste tires according to claim 14, characterized in that: The water jet pulverizing device comprises a frame (7), the transmission drive assembly and a plurality of supporting rollers are all located on the frame (7), the plurality of supporting rollers are arranged at intervals in the left-right direction, and the axes of the plurality of supporting rollers extend in the front-back direction.

17. The equipment for producing rubber powder from waste tires according to claim 16, characterized in that: The water jet pulverizing device also comprises a lifting frame (8), the multiple supporting rollers comprise two movable rollers (71) and a plurality of fixed rollers (72), the two movable rollers (71) are arranged at intervals on the left and right, the plurality of fixed rollers (72) are all located between the two movable rollers (71), the movable rollers (71) are capable of moving in the left and right directions and tensioning the tire ring belt (1103), the transmission drive assembly is connected to the movable rollers (71), the axis of the grinding wheel (1001) extends in the front-back direction, the grinding assembly (10) and the lifting frame (8) are located above the multiple supporting rollers, the end of the grinding wheel (1001) is located in the lifting frame (8), and the grinding assembly (10) and the lifting frame (8) are capable of moving up and down synchronously.

18. The equipment for producing rubber powder from waste tires according to claim 17, characterized in that: The two water jet assemblies (9) are arranged at intervals on the left and right. The two water jet assemblies (9) are both located above the multiple supporting rollers and between the two water jet assemblies (9) of the grinding assembly (10). The water jet assembly (9) also includes a mounting seat (92), a mounting slide block (93), a screw rod (94) and a linear guide rod (95). The crushing water knife (91), the mounting seat (92) and the mounting slide block (93) are connected in sequence. The screw rod (94) and the linear guide rod (95) both extend in the front-to-back direction. The screw rod (94) and the linear guide rod (95) both pass through the mounting slide block (93). The screw rod (94) is connected to a servo motor (96). The crushing water knife (91), the mounting seat (92) and the mounting slide block (93) can all reciprocate in the front-to-back direction.

Images