Hydraulic constant-temperature grinding system and process

Abstract

The invention provides a hydraulic constant-temperature grinding system and process. The system comprises a hydraulic grinding device; the hydraulic grinding device comprises an inner cylinder and an outer cylinder; water inlet and outlet pipes are arranged on the end faces of the two ends of the outer cylinder respectively. The inner barrel is cylindrical, a feeding hole and a discharging hole are respectively formed in the centers of the end surfaces of the two ends of the inner barrel, and the inner barrel is concentrically mounted in a cavity of the outer barrel through a water bearing and a rotating shaft seal; a spiral blade is arranged on the peripheral wall of the inner cylinder in a surrounding manner; a plurality of grinding media are fixed on the inner wall of the inner cylinder; the discharge hole is communicated with a cyclone separator; the process is a grinding process using the grinding system. Hydraulic drive is adopted to replace traditional motor-speed reducer mechanical transmission, and integrated compact modular design is matched, so that energy consumption and operation cost are remarkably reduced, the problems of abrasion, lubrication and maintenance of mechanical transmission are solved, mechanical spark hidden danger is avoided, and intrinsic safety and reliability are achieved.

Description

Technical Field

[0001] This application relates to the field of mineral processing technology and equipment, and in particular to a hydraulic constant temperature grinding system and process. Background Technology

[0002] Grinding, as a core step in mineral processing, is valuable because it achieves deep separation of target and unwanted minerals through physical processes, laying the foundation for subsequent sorting and quality control. Currently, mainstream grinding equipment on the market includes sand mills, ball mills, roller mills, colloid mills, Raymond mills, and air jet mills. While these machines can meet basic grinding needs, their power systems generally rely on mechanical transmission, resulting in high energy consumption and significantly increased production costs. More importantly, in dry grinding, mechanical friction and material collisions easily generate a large amount of heat. This not only accelerates equipment wear and affects structural stability but may also induce chemical modification of the ground materials, adversely impacting subsequent processing and utilization.

[0003] Existing grinding mills typically use air cooling, while some use water cooling, but this only applies to the main shaft and does not take into account the temperature rise of the material during grinding. If the mineral composition is temperature-sensitive, the high temperature inside the grinding chamber may trigger chemical modifications such as changes in the mineral lattice, surface oxidation, or phase transformation, affecting the mineral's state.

[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide a hydraulic constant-temperature grinding system and process that, while ensuring a constant grinding environment, achieves zero mechanical transmission, significantly reducing energy consumption and improving production efficiency. This breakthrough design provides an efficient solution for grinding various materials and is expected to be widely used in the industrial field.

[0006] To achieve the above objectives, this application provides the following technical solution: This application provides a hydraulic constant temperature grinding system, including a hydraulic grinding device and a water supply system that can provide constant temperature hydraulic power to the hydraulic grinding device; The hydraulic grinding device includes a base, an inner cylinder, and an outer cylinder fixed on the base; The outer cylinder has a cylindrical cavity inside; water inlet and outlet pipes communicating with the cavity are respectively provided on the end faces of both ends of the outer cylinder; The inner cylinder is cylindrical, and an inlet and an outlet are respectively provided at the center of the two end faces of the inner cylinder. The inner cylinder is concentrically installed in the cavity of the outer cylinder through a water bearing and a rotating shaft seal. The outer peripheral wall of the inner cylinder is surrounded by spiral blades. Several grinding media are fixed on the inner wall of the inner cylinder. The outlet is connected to a cyclone separator. The water supply system connects the two inlet and outlet pipes of the outer cylinder to form a circulating water circuit. The circulating water flow impacts the spiral blades, causing the inner cylinder to rotate.

[0007] Furthermore, the average working diameter of the helical blade is 700-750 mm.

[0008] Furthermore, the angle between the tangent direction of the helical blade and the axial direction is 25°-35°.

[0009] Furthermore, the hydraulic constant temperature grinding system also includes a feeding box fixed on the base, the feeding box is equipped with a sealing cover, and the outlet of the feeding box is connected to the feed inlet of the hydraulic grinding device through a rotary joint.

[0010] Furthermore, the hydraulic constant temperature grinding system also includes an air chamber and a side pipe disposed on the side wall of the feed box. The side pipe is connected to the feed box, and the air chamber is connected to the side pipe through an air valve. The air valve controls the conveying air velocity within the range of 15-20 m / s.

[0011] Furthermore, the grinding media is spherical, segmented, or rod-shaped, and the grinding media material is carbon steel, stainless steel, tungsten steel, titanium alloy, corundum, or zirconium oxide ceramic.

[0012] Furthermore, the water supply system controls the output water flow velocity to 20-30 m / s and the water temperature to the range of 25-100℃.

[0013] Furthermore, the water supply system includes a water tank, a circulating water pump, a water valve, and a constant temperature circulation device; one inlet and outlet water pipe of the outer cylinder is connected to the other inlet and outlet water pipe of the outer cylinder in sequence via the water tank, the circulating water pump, the water valve, and the constant temperature circulation device to form a circulating water path.

[0014] Furthermore, the relationship between the inner cylinder rotation speed and the output water flow rate of the water supply system is as follows: ; In the formula, n is the rotational speed of the inner cylinder, in r / s; v is the flow velocity of the driving water, in m / s; and d is the average effective diameter of the helical blades, in m. The lift angle of the helical blade, expressed in degrees or rad; The total transmission efficiency of the system is 0.7-0.9.

[0015] The present invention also proposes a grinding process using the aforementioned hydraulic constant temperature grinding system, comprising the following steps: Step 1: Connect the water supply system to the inlet and outlet pipes of the outer cylinder to form a complete circulating water circuit; feed the material into the inner cylinder through the inlet. Step 2: Turn on the water supply system. The circulating water will drive the blades, causing the inner cylinder to rotate steadily and grind the material. Step 3: After grinding, air is supplied into the inner cylinder through the feed inlet. The fine material particles inside the cylinder are conveyed by the air force and sent to the cyclone separator through the discharge outlet to achieve gas-solid separation and collection of fine material particles.

[0016] The technical solution of this application has the following beneficial effects: This application's hydraulic constant-temperature grinding system uses hydraulic drive to replace the traditional motor-reducer mechanical transmission. Combined with an integrated, compact, and modular design, it significantly reduces energy consumption and operating costs, avoids wear, lubrication, and maintenance issues associated with mechanical transmission, and eliminates the risk of mechanical sparks, ensuring inherent safety and reliability. The system integrates a constant-temperature water circulation unit, which suppresses grinding friction heat, protects the crystal structure of heat-sensitive minerals, and extends the service life of mechanical components. The closed-loop water circuit and sealed pneumatic conveying design effectively control dust dispersion, making it suitable for various mining environments and combining green environmental protection with convenient maintenance.

[0017] The grinding process described in this application achieves clean, efficient, and continuous material transport through a non-mechanical conveying scheme that separates pneumatic conveying from hydrocyclones. This reduces the risk of pipeline wear and blockage, laying the foundation for fully automated control of the entire process. It breaks through the limitations of traditional grinding methods that only mechanically crush materials; by precisely adjusting the temperature of the circulating water, grinding and activation can be performed simultaneously, making it applicable to a wide range of scenarios. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein: Figure 1 This is a schematic diagram of the system structure according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the outer and inner cylinders in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the installation of the helical blades according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1-Air bag, 2-Air valve, 3-Feed box, 31-Sealing cover, 32-Side pipe, 33-Box support, 4-Rotary joint, 5-Rotary shaft seal, 6-Hydraulic grinding device, 61-Feeding port, 62-Discharge port, 63-Water outlet, 64-Water inlet, 601-Inner cylinder, 602-Spiral blade, 603-Outer cylinder, 604-End plate, 605-Grinding medium, 606-Water bearing, 607-Locking part, 7-Cyclone separator, 8-Water tank, 9-Circulating water pump, 10-Water valve, 11-Constant temperature circulation device, 12-Base. Detailed Implementation

[0022] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to limit this disclosure.

[0024] In the description of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and do not require this application to be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] like Figures 1 to 3 As shown, a hydraulic constant temperature grinding system includes a hydraulic grinding device 6 and a water supply system that can provide constant temperature hydraulic power for the hydraulic grinding device 6; The hydro-grinding device 6 includes a base 12, an inner cylinder 601, and an outer cylinder 603 fixed on the base 12; The outer cylinder 603 has a cylindrical cavity inside; water inlet and outlet pipes communicating with the cavity are respectively provided on the end faces of both ends of the outer cylinder 603; for easy distinction, the one closer to the feed inlet of the two water inlet and outlet pipes is designated as outlet 63, and the other is designated as inlet 64. The inner cylinder 601 is cylindrical, and an inlet and an outlet 62 are respectively provided at the center of the two end faces of the inner cylinder 601. The inlet and outlet 62 serve as the material inlet and outlet and also as the main rotation axis of the inner cylinder 601. Both need to be precisely fixed on the axis of the inner cylinder 601. The inner cylinder 601 is concentrically installed in the cavity of the outer cylinder 603 through a water bearing 606 and a rotating shaft seal 5. The outer peripheral wall of the inner cylinder 601 is surrounded by spiral blades 602. Several grinding media 605 are fixed on the inner wall of the inner cylinder 601. The outlet 62 is connected to a cyclone separator 7. The water supply system connects the inlet 64 and outlet 63 of the outer cylinder 603 to form a circulating water path. The circulating water flow impacts the spiral blades 602, causing the inner cylinder 601 to rotate.

[0026] The water-powered grinding device 6 replaces the traditional motor-reducer mechanical transmission structure with a force transmission method, which not only significantly reduces system energy consumption and operating costs, but also avoids common wear, lubrication and maintenance problems of mechanical transmission components. Moreover, it can control the water temperature to deal with the heat generation and cooling during the grinding process, so as to achieve green, energy-saving and low-maintenance sustainable grinding operation.

[0027] Furthermore, the average working diameter of the helical blade 602 is 700mm-750mm; the angle between the tangent direction of the helical blade 602 and the axial direction is 25°-35°.

[0028] Furthermore, the grinding media 605 is used to grind materials. The grinding media 605 can be in various shapes such as spherical, segmented, or rod-shaped, and can be made of grinding materials available in the prior art, such as special alloys such as carbon steel / alloy steel, stainless steel, tungsten steel / titanium alloy, corundum, and zirconium oxide ceramics.

[0029] Furthermore, the outer cylinder 603 includes an intermediate cylinder and end plates 604 connected to both ends of the intermediate cylinder by flanges. The end plates 604 have a central hole with a diameter larger than that of the feed port 61 / discharge port 62. A ring of flange holes is provided around the outer periphery of the end plates 604. The end plates can be installed on the intermediate cylinder by locking devices 607 such as bolts and nuts. The water bearing 606 is fixed to the inner wall of the end plate 604 by a water bearing seat. A rotary shaft seal 5 is installed on the outer wall of the end plate 604 to achieve water sealing. The water bearing 606 and the rotary shaft seal 5 can be commercially available products.

[0030] In a specific example, the inner cylinder 601 has a diameter of 600 mm and a length of 1200 mm; the inner diameters of the feed port 61 and discharge port 62 of the inner cylinder 601 are both 200 mm. The outer cylinder 603 has a cavity diameter of 800 mm and a length of 1300 mm. The outer cylinder 603 is stably supported by the base 12, and the inner diameters of the water inlet 64 and water outlet 63 of the outer cylinder 603 are both 50 mm. The average working diameter of the helical blade 602 is 700 mm, the angle between the tangent direction of the helical blade 602 and the axial direction is 30°, and the helical blade 602 has a total of 20 turns, corresponding to a pitch (layer spacing) of 60 mm.

[0031] In one embodiment, the hydraulic constant temperature grinding system further includes a feeding box 3 fixed to the base 12 by a feeding box bracket 33, the feeding box 3 being provided with a sealing cover 31; the outlet of the feeding box 3 is connected to the inlet of the hydraulic grinding device 6 via a rotary joint 4; the rotary joint 4 can be a commercially available product.

[0032] In one embodiment, the hydraulic constant temperature grinding system further includes an air receiver 1 and a side pipe 32 disposed on the side wall of the feed box 3. The side pipe 32 is connected to the feed box 3, and the air receiver 1 is connected to the side pipe 32 through an air valve 2. The air receiver 1 stores compressed air, and its working pressure is maintained at 0.2-0.6MPa. The conveying air speed is precisely controlled within the range of 15-20m / s by adjusting the air valve 2 to provide power for conveying the ground material. The combination of pneumatic conveying and cyclone can achieve clean and efficient material conveying, reduce the risk of pipe wear and blockage, and support continuous feeding and discharging, laying the foundation for full-process automated control.

[0033] In one embodiment, the hydraulic constant-temperature grinding system further includes a water supply system that provides water power to the hydraulic grinding device 6; the water supply system includes a water tank 8, a circulating water pump 9, a water valve 10, and a constant-temperature circulation device 11; the outlet 63 of the outer cylinder 603 is connected to the inlet 64 of the outer cylinder 603 in sequence via the water tank 8, the circulating water pump 9, the water valve 10, and the constant-temperature circulation device 11 to form a circulating water path, which drives the spiral blades 602, thereby driving the inner cylinder 601 to rotate. The constant-temperature circulation device 11 is a heat exchanger or a constant-temperature water circulation device (water temperature controller); preferably, the constant-temperature circulation device 11 is a heat exchanger, which, during use, carries away the heat of the circulating water through another fluid medium to ensure the constant temperature of the circulating water, while recovering heat for other uses.

[0034] The water supply system controls the output water flow velocity at 20-30 m / s and the water temperature within the range of 25-100℃. This controllable water temperature allows for synergistic "grinding-activation" operations at different temperatures. Combined with specific activators, it can enhance the surface activity of minerals, creating conditions for the preparation of high-value-added products such as porous materials and expanding the equipment's application range.

[0035] Specifically, considering the potential impact of temperature on mineral composition, the water temperature is best controlled within the range of 25℃ to 40℃. This constant temperature environment effectively suppresses the heat generated by friction during grinding, protecting the crystal structure of heat-sensitive minerals and ensuring consistent product properties and high quality. Simultaneously, the stable low-temperature environment also reduces the impact of high temperatures on mechanical components and lubrication performance, extending the equipment's service life. The relationship between the inner cylinder rotation speed and the output water flow rate of the water supply system is as follows: ; In the formula, The rotational speed of the inner cylinder is expressed in r / s. The velocity that drives the water flow, measured in m / s; The average effective diameter of the helical blades is expressed in meters (m). The lift angle of the helical blade, expressed in degrees or rad; The total transmission efficiency of the system is 0.7-0.9.

[0036] With the water flow velocity controlled at 20-30 m / s as mentioned above, the average effective diameter of the helical blades is 700-750 mm, and the angle between the blade tangent and the axial direction is 25°-35°. Substituting values ​​of 0.7-0.9 into the formula, the rotational speed range of the inner cylinder is 166-516 rpm. This indicates that the hydraulic constant-temperature grinding system is a medium-speed grinding device, suitable for fine grinding of most powders and slurries. This makes the system adaptable to a wide range of grinding materials, including non-metallic minerals (such as kaolin, barite, graphite, etc.), metallic materials (such as steel, cast iron, cemented carbide, etc.), alloy materials (such as aluminum alloys, zinc alloys, copper, etc.), various plastics and composite materials, and the dissociation and recycling of waste printed circuit boards (PCBs), etc. Furthermore, under appropriate configuration conditions, this system can also be extended to the homogenization of food industry raw materials (such as wheat grains, bran flakes), liquid materials (such as juice, dairy products), and the low-temperature grinding and modification of pharmaceutical intermediates. The aforementioned materials are widely available in nature and in the mineral processing field, and their collection and pre-processing techniques are conventional technologies in this field and are well-known to those skilled in the art. Therefore, their specific sources and pre-processing procedures will not be elaborated in this embodiment. At this speed, over 85% of the material can be ground to a particle size of 325 mesh.

[0037] In summary, this system adopts an integrated and compact structure with simple internal components, a high degree of modularity, and is easy to disassemble, maintain, and transport. Using water as the transmission medium ensures inherent safety and completely eliminates the safety hazards caused by mechanical sparks. Simultaneously, the closed-loop water circuit and sealed pneumatic conveying system effectively suppress dust diffusion, achieving clean production. It is highly adaptable to various mining environments and possesses significant value for industrial application.

[0038] This invention also proposes a grinding process using the aforementioned hydraulic constant temperature grinding system, wherein the hydraulic constant temperature grinding system includes a water supply system, an air chamber, an air valve, a feed box, etc., and the grinding process includes the following steps: Step 1: Connect the water supply system to the inlet and outlet of the outer cylinder to form a complete circulating water circuit; feed the material into the inner cylinder through the feed inlet; Step 2: Turn on the water supply system and inject constant temperature water with a set flow rate into the inlet of the outer cylinder. The circulating water flow drives the blades, causing the inner cylinder to rotate steadily and grind the material. Under the impact and grinding action of the grinding media inside the cylinder, the material gradually disintegrates and forms fine particles. Step 3: After the process continues for the set time, open the air valve to allow airflow to enter the inner cylinder through the feed inlet. Under the action of airflow, the fine particles in the cylinder are sent to the cyclone separator through the discharge outlet to achieve gas-solid separation. The separated fine particles are discharged from the bottom of the cyclone separator and collected as product.

[0039] Application Example 1 This hydraulic constant temperature grinding system was used to perform ultrafine grinding and activation treatment on kaolin from a certain area.

[0040] The hydraulic constant temperature grinding system follows the specific example described above. The water flow velocity is controlled at 25 m / s, the average effective diameter of the spiral blades is 700 mm, and the angle between the blade tangent and the axial direction is 25°. μ is set to 0.9, and substituting this into the inner cylinder rotation speed formula above, the rotation speed is approximately 284 rpm.

[0041] The initial particle size (D50) of the kaolin raw material was 45 μm. After continuous treatment at a constant water temperature of 30℃ for 90 minutes, the kaolin particles were effectively refined and activated, and their particle size (D90) decreased to 10 μm. Furthermore, the constant temperature environment effectively protected its lamellar crystal structure, and the whiteness increased from 82% of the raw material to 88%. The crystal morphology remained intact, and the activity and specific surface area increased significantly, meeting the requirements for the preparation of high-performance catalyst supports.

[0042] Application Example 2 This hydraulic constant temperature grinding system is used to perform ultrafine dispersion and surface modification treatment on calcined kaolin.

[0043] The hydraulic constant temperature grinding system follows the specific example described above. The water flow velocity is controlled at 25 m / s, the average effective diameter of the helical blades is 720 mm, the angle between the blade tangent and the axial direction is 28°, and the system friction coefficient μ is taken as 0.8. Substituting these values ​​into the previous formula for the inner cylinder rotation speed, the operating speed is approximately 285 rpm.

[0044] The calcined kaolin raw material partially agglomerates during calcination, with an initial particle size D50 of 15 μm. Under constant water temperature of 65℃, and with simultaneous injection of a silane coupling agent, after continuous treatment for 70 minutes, the material is efficiently deagglomerated and dispersed, with its final particle size D97 stabilizing below 2 μm. The constant-temperature grinding environment ensures the uniformity and completeness of the modification reaction, preventing uneven hydrolysis or adsorption of the modifier due to temperature fluctuations.

[0045] Application Example 3 This hydraulic constant temperature grinding system is used to perform high-concentration wet ultrafine grinding of barite.

[0046] The hydraulic constant temperature grinding system follows the specific example described above. The water flow velocity is controlled at 22 m / s, the average effective diameter of the helical blades is 740 mm, the angle between the blade tangent and the axial direction is 32°, and the system friction coefficient μ is taken as 0.75. Substituting these values ​​into the inner cylinder rotation speed formula described above, the operating speed is approximately 245 rpm.

[0047] The initial particle size of barite concentrate (BaSO4 > 92%) was 100-200 mesh (approximately 74-150 μm). Under constant temperature (25℃) conditions, it was continuously processed for 120 minutes with a high-solids-content slurry (70%). The high shear force provided by the system effectively broke down the cleavage planes of the barite, resulting in a final product fineness of D90 ≤ 6 μm. Constant temperature control prevented drastic changes in slurry viscosity caused by heat generated during prolonged grinding, ensuring grinding efficiency and stability.

[0048] Application Example 4 This hydraulic constant temperature grinding system is used to gently exfoliate flake graphite to prepare micro-nano graphite flakes.

[0049] The hydraulic constant temperature grinding system follows the specific example described above. The water flow velocity is controlled at 28 m / s, the average effective diameter of the helical blades is 710 mm, the angle between the blade tangent and the axial direction is 26°, and the system friction coefficient μ is taken as 0.85. Substituting these values ​​into the inner cylinder rotation speed formula described above, the operating speed is approximately 335 rpm.

[0050] Natural flake graphite (carbon content >99%) initially had a particle size of approximately 80 mesh (about 180 μm). It was continuously processed for 90 minutes at a constant water temperature of 40°C under a protective atmosphere. The precisely controlled shear force of the system primarily acted on the interlayer structure of the graphite, achieving longitudinal exfoliation of large flakes rather than lateral fragmentation. The final product was graphene nanosheets with a thickness in the submicron range and a diameter of 5-15 μm, exhibiting a well-preserved high aspect ratio structure and excellent electrical conductivity and mechanical properties. The constant temperature environment protected the crystal structure of the graphite sheets, resulting in superior performance when used in the printing of flexible conductive circuits and thermally conductive composite materials.

[0051] This application innovatively integrates constant-temperature water circulation with material handling processes, constructing a complete process chain of "hydraulic drive - constant-temperature grinding - pneumatic conveying - cyclone separation". This process not only ensures temperature stability during grinding, effectively preventing changes in the properties of heat-sensitive materials, but also achieves clean and continuous material conveying through pneumatic conveying. In terms of performance, the system's hydraulic drive significantly reduces energy consumption, achieving green and low-carbon operation. Simultaneously, its constant-temperature operating environment provides a stable thermal environment for material processing, ensuring consistent product quality. Furthermore, the flexible temperature regulation mechanism supports various operating conditions, broadening the equipment's application range. The overall structural design balances functionality and adaptability, enabling stable operation in various industrial scenarios. These features make this system of significant application value in fields such as fine mineral processing and new material preparation, providing an innovative solution for the development of modern material processing technology.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hydraulic constant-temperature grinding system, characterized in that: Includes a hydraulic grinding device (6) and a water supply system that provides constant temperature hydraulic power to the hydraulic grinding device (6); The hydro-grinding device (6) includes a base (12), an inner cylinder (601), and an outer cylinder (603) fixed on the base (12). The outer cylinder (603) has a cylindrical cavity inside; water inlet and outlet pipes communicating with the cavity are respectively provided on the end faces of both ends of the outer cylinder (603); The inner cylinder (601) is cylindrical, and the center of each end face of the inner cylinder (601) is provided with a feed port and a discharge port (62). The inner cylinder (601) is concentrically installed in the cavity of the outer cylinder (603) through a water bearing (606) and a rotary shaft seal (5). The outer peripheral wall of the inner cylinder (601) is surrounded by spiral blades (602). A number of grinding media (605) are fixed on the inner wall of the inner cylinder (601). The discharge port (62) is connected to a cyclone separator (7). The water supply system connects the two inlet and outlet pipes of the outer cylinder (603) to form a circulating water circuit. The circulating water flow impacts the spiral blades (602) and drives the inner cylinder (601) to rotate.

2. The hydraulic constant temperature grinding system according to claim 1, characterized in that: The average working diameter of the spiral blade (602) is 700-750 mm.

3. The hydraulic constant-temperature grinding system according to claim 1, characterized in that: The angle between the tangent direction and the axial direction of the spiral blade (602) is 25°-35°.

4. The hydraulic constant temperature grinding system according to claim 1, characterized in that: The hydraulic constant temperature grinding system also includes a feed box (3) fixed on the base (12), the feed box (3) is provided with a sealing cover (31), and the outlet of the feed box (3) is connected to the feed port of the hydraulic grinding device (6) through a rotary joint (4).

5. The hydraulic constant-temperature grinding system according to claim 4, characterized in that: The hydraulic constant temperature grinding system also includes an air chamber (1) and a side pipe (32) disposed on the side wall of the feed box (3). The side pipe (32) is connected to the feed box (3). The air chamber (1) is connected to the side pipe (32) through an air valve (2). The air valve (2) controls the conveying air speed within the range of 15-20m / s.

6. The hydraulic constant temperature grinding system according to claim 1, characterized in that: The grinding media (605) is spherical, segmented, or rod-shaped, and the grinding media (605) is made of carbon steel, stainless steel, tungsten steel, titanium alloy, corundum, or zirconium oxide ceramic.

7. The hydraulic constant temperature grinding system according to claim 1, characterized in that: The water supply system controls the output water flow velocity at 20-30m / s and the water temperature at 25-100℃.

8. The hydraulic constant temperature grinding system according to claim 1, characterized in that: The water supply system includes a water tank (8), a circulating water pump (9), a water valve (10), and a constant temperature circulation device (11); one inlet and outlet pipe of the outer cylinder (603) is connected to the other inlet and outlet pipe of the outer cylinder (603) in sequence through the water tank (8), the circulating water pump (9), the water valve (10), and the constant temperature circulation device (11) to form a circulating water path.

9. The hydraulic constant-temperature grinding system according to claim 1, characterized in that: The relationship between the rotational speed of the inner cylinder and the output water flow velocity of the water supply system is as follows: ； In the formula, The rotational speed of the inner cylinder is expressed in r / s. The velocity that drives the water flow, measured in m / s; The average effective diameter of the helical blades is expressed in meters (m). The lift angle of the helical blade, expressed in degrees or rad; The total transmission efficiency of the system is 0.7-0.

9.

10. A grinding process using the hydraulic constant-temperature grinding system as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step 1: Connect the water supply system to the inlet and outlet water pipes of the outer cylinder (603) to form a complete circulating water circuit; send the material into the inner cylinder (601) through the feed inlet. Step 2: Turn on the water supply system. The circulating water flow drives the blades, which in turn drives the inner cylinder (601) to generate a stable rotational motion to grind the material. Step 3: After grinding, air is sent into the inner cylinder (601) through the feed port. The fine material particles in the cylinder are sent into the cyclone separator (7) through the discharge port (62) by the wind power to realize gas-solid separation and collection of fine material particles.

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