Measuring device and measuring method

Abstract

The present application provides a measuring device and a measuring method, wherein the measuring device includes a crushing part, a collection unit and a detection part, the crushing part is used to crush the material to be measured, the collection unit is connected to the input circuit of the crushing part, and is used to collect the power input information of the crushing part, the detection part includes a detection unit and a conveying unit, one end of the conveying unit is connected to the detection unit, and the other end is connected to the crushing part, the conveying unit is used to transport at least part of the material to be measured after crushing to the detection unit, and the detection unit is used to detect the specific surface area of the material to be measured. By setting the collection unit and the detection unit, the input power of the crushing part can be collected and the specific surface area of the material to be measured can be detected, so that the staff can accurately measure the power required to grind the unit mass of the material to be measured to the target fineness according to the relationship between the specific surface area of the material to be measured and the input power, thereby avoiding the situation where the vertical stirred mill equipment is selected too large, and improving the grinding efficiency.

Description

Technical Field

[0001] The present application belongs to the field of powder engineering technology, and specifically relates to a measuring device and a measuring method. Background Art

[0002] Vertical stirred mills are widely used for fine grinding or regrinding of various nonferrous metals, ferrous metals, and non-metallic minerals, such as copper, molybdenum, gold, silver, lead, zinc, calcium carbonate, graphite, and barite. During operation, vertical stirred mills require a high-speed rotation of the stirring mechanism to move the grinding media. This causes the grinding media and material to grind, collide, or tumble within the mill barrel, thereby crushing and pulverizing the material. This differs from the operation of traditional grinding equipment. Traditional horizontal grinding equipment (ball mills, rod mills, etc.) crushes the material by throwing and smashing the grinding media. This means that the material's crushing behavior within a vertical stirred mill differs significantly from that within traditional grinding equipment. Therefore, traditional ball mill selection methods (such as the Bond work index) are difficult to apply to vertical stirred mills.

[0003] Since the grinding process of vertical stirred mill equipment is very complicated, existing vertical stirred mill equipment manufacturers basically use their own independent measurement and calculation systems to select equipment. For example, Chinese invention patent CN106644639B discloses a selection method for industrial vertical stirred mills and a closed-circuit fine grinding system for selection tests. However, due to the limitations of the rationality of relevant parameter measurement and calculation, a large margin coefficient and space need to be reserved to meet production needs, which can easily lead to the selection of vertical stirred mill equipment being too large, thereby reducing grinding efficiency and increasing grinding costs. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a measuring device and a measuring method that can accurately measure the power required to grind a unit mass of the material to be tested to the target fineness, thereby avoiding the situation where the vertical stirred mill equipment is selected too large.

[0005] In order to solve the above problems, the present application provides a measuring device, including:

[0006] A crushing part, which is used to crush the material to be tested;

[0007] a collection unit connected to the input circuit of the crushing part and used to collect power input information of the crushing part;

[0008] The detection part includes a detection unit and a conveying unit, one end of the conveying unit is connected to the detection unit, and the other end is connected to the crushing part. The conveying unit is used to transport at least part of the crushed material to be tested to the detection unit, and the detection unit is used to detect the specific surface area of the material to be tested.

[0009] Optionally, the crushing unit includes:

[0010] a crushing shell, wherein a stirring grinding chamber is formed in the crushing shell;

[0011] a plurality of crushing media, wherein the plurality of crushing media are arranged in the crushing shell;

[0012] A driving assembly, the driving assembly is used to drive the plurality of crushing media to move in the stirred grinding chamber to grind the material to be tested;

[0013] Among them, the multiple crushing media include a first crushing medium, a second crushing medium and a third crushing medium, the mass ratio of the first crushing medium, the second crushing medium and the third crushing medium is 1:1:1, and the diameter ratio of the first crushing medium, the second crushing medium and the third crushing medium is 2:3:4.

[0014] Optionally, the driving component includes:

[0015] stirring motor;

[0016] A stirring spindle, the stirring spindle is arranged in the stirring grinding chamber and connected to the stirring motor;

[0017] A stirrer is arranged on the stirring main shaft.

[0018] Optionally, the stirring shaft is provided with a plurality of slots, which are evenly arranged along the axial direction of the stirring shaft and staggered along the radial direction of the stirring shaft, and the agitator is connected to the stirring shaft through the slots.

[0019] Optionally, the driving component further includes:

[0020] A first regulating unit, wherein the output end of the stirring motor is connected to the stirring main shaft through the first regulating unit, and the first regulating unit is used to regulate the rotation speed of the stirring main shaft.

[0021] Optionally, the crushing shell includes:

[0022] a first cylinder;

[0023] The second cylinder is movably arranged in the first cylinder, and the second cylinder can move along the length direction of the second cylinder.

[0024] Optionally, a filtering unit is provided at the bottom of the second cylinder.

[0025] Optionally, the crushing part further includes a lifting assembly, and the lifting assembly is used to drive the second cylinder to move;

[0026] Wherein, the lifting assembly includes a lifting screw and a lifting nut, the lifting screw is threadedly connected to the lifting nut, the lifting nut is fixedly arranged on the first cylinder, and the lifting screw is connected to the second cylinder.

[0027] Optionally, the crushing unit further includes:

[0028] An adjusting plate is movably connected to the crushing shell, and the adjusting plate can be selectively set at a first height or a second height to adjust the effective volume of the stirring and grinding chamber.

[0029] Optionally, the measuring device further comprises:

[0030] Grading unit;

[0031] a grading feeding pump, one end of which is connected to the discharge port of the crushing part, and the other end of which is connected to the inlet of the grading unit;

[0032] A circulating feeding pump, one end of which is connected to the feeding port of the crushing part, and the other end of which is connected to the first outlet of the grading unit.

[0033] Optionally, the measuring device further comprises:

[0034] a grinding product charging bin, the grinding product charging bin being connected to the discharge port of the crushing part and being used for storing the grinding product;

[0035] A classification sand collection bin is provided between the circulating feed pump and the classification unit and is used for storing process materials;

[0036] A grading overflow collection bin is connected to the second outlet of the grading unit and is used to store target materials.

[0037] Optionally, the measuring device further comprises:

[0038] The second regulating unit is connected to the input circuit of the crushing part and is used to adjust the input frequency of the crushing part.

[0039] Another aspect of the present application provides a measurement method, which is applied to the above-mentioned measurement device, and the method includes:

[0040] Obtaining median diameter information of the material to be tested;

[0041] Formulate median diameter information of the target material;

[0042] Setting at least five preset finenesses based on the median diameter information of the material to be tested and the median diameter information of the target material;

[0043] Obtaining particle size information of the material to be tested when it is ground to the preset fineness;

[0044] Calculating the unit power consumption value when the material to be tested is ground to the preset fineness;

[0045] Based on the particle size information and unit power consumption values corresponding to at least five of the preset finenesses, a linear relationship between different grinding finenesses of the material to be tested and the unit power consumption values is determined.

[0046] Optionally, obtaining the particle size information of the material to be tested when it is ground to the preset fineness includes:

[0047] Obtain the target fineness ratio when the material to be tested is ground to the preset fineness.

[0048] Optionally, the calculating of the unit power consumption value when the material to be tested is ground to the preset fineness includes:

[0049] Obtaining the mass of the material to be tested;

[0050] Obtaining the power output by the crushing part when the material to be tested is ground to the preset fineness;

[0051] Determining the grinding time required to grind the material to be tested to the preset fineness;

[0052] The unit power consumption value is calculated based on the mass of the material to be measured, the power output by the crushing part and the grinding time.

[0053] Beneficial effects

[0054] An embodiment of the present invention provides a measuring device and a measuring method, wherein the measuring device is mainly capable of collecting the input power of the crushing part and detecting the specific surface area of the material to be measured by setting a collection unit and a detection unit, so that the staff can accurately measure the power required to grind the unit mass of the material to be measured to the target fineness based on the relationship between the specific surface area of the material to be measured and the input power, thereby avoiding the situation where the vertical stirred mill equipment is selected too large, improving the grinding efficiency of the vertical stirred mill equipment, and thus reducing the cost of ultrafine grinding of materials. The measurement method is applied to a measuring device that can measure the power required to grind a unit mass of the material to be tested to the target fineness. It is applicable to the power measurement of fine-grained materials (materials below 0.074 mm) during stirring and fine grinding. The D50 particle size or specific surface area of the fine-grained materials is used as the main characterization parameter of the fineness, and the relationship between the surface increase and power consumption during the fine grinding process of the material to be tested is constructed. The measured parameters are closer to the energy transfer process of material fine grinding and the area theory. At the same time, the unit power consumption of the stirred mill is calculated by multiple grinding cycles, which overcomes the risk of numerical amplification of the unit power consumption of traditional stirred mills, makes the grinding process closer to actual power consumption and production practice, and makes the measured power consumption data more accurate. It also overcomes the shortcomings of the current open-circuit power consumption measurement method of the specific power consumption method. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic structural diagram of a measuring device according to an embodiment of the present application;

[0056] Figure 2 This is a schematic structural diagram of a crushing unit according to an embodiment of the present application;

[0057] Figure 3 This is a flow chart of the measurement method according to an embodiment of the present application;

[0058] Figure 4 This is a curve comparison chart of the -0.038mm ratio and unit power consumption when grinding iron sulfide concentrate in this application and related technologies.

[0059] The reference numerals indicate:

[0060] 1. Collection unit; 2. Detection unit; 3. Conveying unit; 4. Crushing shell; 41. First cylinder; 42. Second cylinder; 421. Filter unit; 43. Feed port; 44. Discharge port; 5. Stirring and grinding chamber; 6. Stirring spindle; 61. Slot; 7. Agitator; 8. Lifting assembly; 81. Lifting nut; 82. Lifting screw; 9. Adjustment plate; 10. Stirring motor; 11. First adjustment unit; 12. Second adjustment unit; 13. Classification unit; 14. Classification feeding pump; 15. Circulation feeding pump; 16. Grinding product charging bin; 17. Classification sand collection bin; 18. Classification overflow collection bin. DETAILED DESCRIPTION

[0061] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0063] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0064] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0065] Vertical stirred mill equipment (horizontal stirred mill equipment) has been widely used in the fine grinding or regrinding operations of various types of non-ferrous metals, ferrous metals and non-metallic minerals or materials, such as copper ore, molybdenum ore, gold and silver ore, lead and zinc ore, calcium carbonate, graphite, barite and other ores. The grinding process of the vertical stirred mill relies more on the high-speed rotation of the stirring device to carry the medium, causing the grinding medium and the material to perform irregular grinding, collision and other tumbling movements in the mill cylinder, thereby achieving the grinding and smashing of the material. This is different from the traditional horizontal ball mill material throwing and smashing operation mode. In other words, the grinding and crushing behavior of the material in the stirred mill is significantly different from that of the traditional ball mill. The unit grinding work index measurement method of the traditional ball mill is difficult to apply to the stirred mill.

[0066] Since the vertical mill grinding process is very complex, in the related technologies, manufacturers of stirred mill equipment basically use their own independent measurement and calculation systems to select equipment. However, due to the limitations of the rationality of the measurement and calculation of related parameters, it is very common to reserve a large margin coefficient and space to meet production needs, which can easily lead to the selection of stirred mills being too large, indirectly resulting in reduced grinding efficiency and increased grinding costs. Among the various types of stirred mill selection and measurement, the relatively mature selection and amplification method is the specific power consumption method. The core of this method is to accurately measure the unit power consumption index of the stirred mill process. However, the conventional specific power consumption method measurement method, which is the main method of open circuit grinding-screening analysis, basically constructs an exponential growth curve between the grinding unit power and the grinding fineness, which greatly increases the risk of exponential amplification of the measured unit power parameter. In addition, there is no relatively reasonable measurement device or method to measure the grinding power index of the stirred mill.

[0067] While there have been reports on theoretical analysis of fine grinding effect factors, mill simulations based on CFD, DEM, and PEPT, and grinding process optimization, relatively little research has examined the relationship between power consumption and the grinding process. Existing studies have shown that power consumption in fine grinding tends to follow the area theory, whereby the grinding input power consumption is strongly correlated with the increase in material surface area before and after pulverization. However, there are currently no devices or methods for coupling surface area and unit power consumption, and there is a lack of research on the correlation between grinding fineness, specific surface area, and unit power consumption after stirred grinding. Furthermore, stirred grinding primarily relies on the relative motion of the grinding media and material particles in the slurry. Beyond the fundamental properties of the material, a variety of process factors influence the grinding behavior of stirred mills, including equipment structure, stirring mechanism, grinding process conditions, and grinding media conditions. Changes in these factors can affect the carrying power, and thus the measurement of unit power consumption during material grinding. Consequently, it is challenging to accurately measure the unit power consumption of stirred mills.

[0068] The present invention aims to provide a device for measuring the unit power consumption of a vertical stirred mill and a matching measuring method.

[0069] See also Figures 1 to 2 As shown, according to one aspect of an embodiment of the present application, a measuring device is provided, including: a crushing part, the crushing part is used to crush the material to be measured; a collection unit 1, the collection unit 1 is connected to the input circuit of the crushing part, and is used to collect power input information of the crushing part; a detection part, the detection part includes a detection unit 2 and a conveying unit 3, one end of the conveying unit 3 is connected to the detection unit 2, and the other end is connected to the crushing part, the conveying unit 3 is used to transport at least part of the crushed material to be measured to the detection unit 2, and the detection unit 2 is used to detect the specific surface area of the material to be measured.

[0070] The measuring device provided in the embodiment of the present invention mainly collects the input power of the crushing part and detects the specific surface area of the material to be measured by setting the collection unit 1 and the detection unit 2, so that the staff can accurately measure the power required to grind the unit mass of the material to be measured to the target fineness according to the relationship between the specific surface area of the material to be measured and the input power, thereby avoiding the situation where the vertical stirred mill equipment is selected too large, improving the grinding efficiency of the vertical stirred mill equipment, and thus reducing the cost of ultrafine grinding of materials.

[0071] The measuring device in this application can be used to measure the power of stirring and fine grinding of fine-grained materials (materials below 0.074mm). The average particle size or specific surface area of the fine-grained materials is used as the main characterization parameter of fineness. The relationship between the increase in surface area and power consumption during the fine grinding process of the material to be measured is established. The measured parameters are closer to the energy transfer process of material fine grinding and the area theory, thereby improving the measurement accuracy and being able to accurately measure the power required to grind a unit mass of the material to be measured to the target fineness.

[0072] The measuring device includes a crushing part, which is used to crush the material to be measured, that is, grind the material to be measured.

[0073] The materials to be tested can be copper ore, molybdenum ore, gold and silver ore, lead and zinc ore, calcium carbonate, graphite, barite, etc. The materials to be tested are placed in the crushing part, which plays the role of grinding.

[0074] The measuring device further comprises a collection unit 1, which can be a digital display instrument capable of collecting torsional power, etc. In the embodiment of the present application, the collection unit 1 is a torque, speed, and rotational power tester.

[0075] Specifically, the acquisition unit 1 is electrically connected to the input circuit of the crushing part to detect the input power required by the crushing part to grind the material to be tested to a target fineness.

[0076] The measuring device further includes a detection unit 2 and a conveying unit 3. One end of the conveying unit 3 is connected to the crushing section, and the other end is connected to the detection unit 2. The conveying unit 3 can sample the grinding product in the crushing section and transport the sample to the detection unit 2. The detection unit 2 is used to detect the surface area and particle size of the sample to analyze the specific surface area of the material to be measured.

[0077] The delivery unit 3 may be a centrifugal pump, an axial flow pump, a vortex pump, etc., which can deliver the sample to the detection unit 2. In the embodiment of the present application, the delivery unit 3 is a micro-negative pressure pump.

[0078] The detection unit 2 may be a laser particle size / surface area analyzer.

[0079] Specifically, a sampling port is provided on the lower side of the crushing part, and a micro-negative pressure pump is connected to the crushing part through the sampling port. A pressure difference is generated between the inlet of the micro-negative pressure pump and the external atmospheric pressure. Under the action of the pressure difference, the grinding process products in the crushing part can be sucked in and then introduced into the sample slot of the laser particle size / surface area analyzer for surface area / particle size analysis of the grinding process products.

[0080] The laser particle size / surface area analyzer may include an optical analysis system and a laser, and detect the surface area and particle size of the grinding process product in the sample tank based on the principle of light scattering to analyze the specific surface area of the grinding process product.

[0081] Among them, the specific surface area is the ratio of the surface area to the volume of the grinding process product, and the particle size is the diameter of the particles. It can be understood that the volume and surface area of the grinding process product can be calculated by the particle size, and then the specific surface area of the grinding process product can be calculated.

[0082] In the above embodiment, the crushing part includes: a crushing shell 4, in which a stirring and grinding chamber 5 is formed; a plurality of crushing media, which are arranged in the crushing shell 4; and a drive assembly, which is used to drive the plurality of crushing media to move in the stirring and grinding chamber 5 to grind the material to be tested.

[0083] The crushing part includes a crushing shell 4, which is roughly barrel-shaped and can be made of materials such as stainless steel.

[0084] Specifically, the crushing shell 4 is provided with a stirring and grinding chamber 5, and the material to be tested is set in the stirring and grinding chamber 5 for grinding. The setting of the stirring and grinding chamber 5 provides a stable setting position for the material to be tested; a feeding port 43 is provided at the top of the crushing shell 4, and the material to be tested can enter the stirring and grinding chamber 5 through the feeding port 43; a discharge port 44 is provided at the bottom of the crushing shell 4, so that the ground product can be discharged through the discharge port 44; an overflow port is also provided on the outer wall of the crushing shell 4 for observing the liquid level of the material to be tested, and a grating screen is provided in the overflow port to prevent the material to be tested from overflowing.

[0085] The crushing part further includes crushing media, and a plurality of crushing media may be provided. The plurality of crushing media are arranged in the stirring grinding chamber 5 .

[0086] Among them, the crushing part also includes a driving component, which is arranged in the stirring grinding chamber 5. The driving component is used to drive a number of crushing media to move so that the several crushing media collide with the material to be tested in the stirring grinding chamber 5. At this time, the material to be tested is ground by the grinding force and extrusion force generated by the collision movement of the several crushing media.

[0087] The crushing medium is a steel ball, and the plurality of crushing media include a first crushing medium, a second crushing medium and a third crushing medium.

[0088] Specifically, the mass ratio of the first, second, and third crushing media is 1:1:1, and the diameter ratio of the first, second, and third crushing media is 2:3:4. By setting the mass ratio of the first, second, and third crushing media to 1:1:1 and the diameter ratio to 2:3:4, the first, second, and third crushing media of different volumes can move at the same speed within the stirred grinding chamber 5, thereby improving the grinding effect of the test material.

[0089] In the above embodiment, the driving assembly includes: a stirring motor 10; a stirring spindle 6, which is arranged in the stirring grinding chamber 5 and connected to the stirring motor 10; and an agitator 7, which is arranged on the stirring spindle 6.

[0090] The stirring motor 10 may be a stepping motor, a DC motor, a servo motor, a torque motor or a switched reluctance motor, etc., and the application does not impose any further limitations. The stirring motor 10 is used to provide power for the movement of the crushing medium.

[0091] The stirring shaft 6 can be a rectangular metal rod or a cylindrical metal rod, etc., which is not further limited in this application. The stirring shaft 6 is coaxially arranged in the stirring grinding chamber 5 and connected to the output end of the stirring motor 10.

[0092] Among them, as one embodiment, the agitator 7 is a stirring rod or a stirring disk, and a plurality of stirring rods or stirring disks are provided, and the plurality of stirring rods or stirring disks are evenly arranged along the length direction of the stirring main shaft 6. At the same time, two adjacent stirring rods or two adjacent stirring disks are staggered along the radial direction of the stirring main shaft 6, thereby improving the grinding effect of the material to be measured; as another embodiment, the agitator 7 is a stirring spiral, and the stirring spiral is sleeved on the stirring main shaft 6 and extends along the length direction of the stirring main shaft 6. In the embodiment of the present application, the agitator 7 is a stirring spiral, and the stirring spiral has a large working area, strong wear resistance, high grinding accuracy, and a large allowable feed particle size, and is suitable for regrinding and ultrafine grinding, thereby increasing the scope of application of the measuring device.

[0093] Specifically, the material to be tested and the crushing medium are added to the stirred grinding chamber 5 through the feed port 43. In the stirred grinding chamber 5, the stirring motor 10 drives the stirring shaft 6 to rotate to drive the agitator 7 to rotate. At this time, the agitator 7 contacts the crushing medium and drives the crushing medium to move in the stirred grinding chamber 5. The material to be tested can be ground by the grinding force and extrusion force generated by the collision of the crushing medium to complete the grinding operation of the material to be tested.

[0094] In some possible embodiments provided in the present application, the agitator 7 may be a grinding tool, which can grind the material to be tested in the stirred grinding chamber 5 by driving the agitator 7 to rotate only by the stirring motor 10 without using a crushing medium.

[0095] In some possible embodiments provided in the present application, a plurality of slots 61 are provided on the stirring shaft 6, and the slots 61 are evenly arranged along the axial direction of the stirring shaft 6 and staggered along the radial direction of the stirring shaft 6, and the agitator 7 is connected to the stirring shaft 6 through the slots 61.

[0096] By opening a plurality of slots 61 on the stirring main shaft 6, the agitator 7 can be detachably connected to the stirring main shaft 6 through the plurality of slots 61. This can achieve the situation that when the agitator 7 is damaged, there is no need to replace the entire stirring main shaft 6, thereby reducing the maintenance cost of the agitator 7 and improving the maintenance efficiency of the agitator 7.

[0097] Among them, a plurality of slots 61 are opened on the stirring main shaft 6, and the slots 61 are evenly arranged along the length direction of the stirring main shaft 6, so that the agitator 7 can be detachably connected to the stirring main shaft 6 through the slots 61, thereby improving the installation speed of the agitator 7.

[0098] Specifically, two adjacent slots 61 are staggered along the radial direction of the stirring main shaft 6 , providing a stable installation position for the stirring screw in the embodiment of the present application.

[0099] In some possible embodiments provided in the present application, the drive assembly further includes: a first adjustment unit 11, the output end of the stirring motor 10 is connected to the stirring main shaft 6 through the first adjustment unit 11, and the first adjustment unit 11 is used to adjust the rotation speed of the stirring main shaft 6.

[0100] Among them, the first adjustment unit 11 can be a gear speed regulation mechanism, a worm speed regulation mechanism or a pulley group speed regulation mechanism, etc., and this application does not make further limitations. In the embodiment of this application, the first adjustment unit 11 is a gear speed regulation mechanism.

[0101] Specifically, the output end of the stirring motor 10 is connected to the stirring main shaft 6 through a gear speed regulating mechanism. By setting the gear speed regulating mechanism, the rotation speed of the stirring main shaft 6 can be adjusted, thereby improving the stability of the crushing part. As an embodiment, the gear speed regulating mechanism is used to reduce the rotation speed of the output end of the stirring motor 10. When the stirring motor 10 is a stepping motor, due to the high rotation speed of the stepping motor, the deceleration effect of the gear speed regulating mechanism can reduce the step angle dwell time of the stepping motor, thereby reducing the jamming of the agitator 7 during rotation, and the movement speed of the crushing medium is closer to a uniform speed, thereby improving the stability of the crushing part. As another embodiment, the gear speed regulating mechanism is used to increase the rotation speed of the output end of the stirring motor 10. When the stirring motor 10 is a switched reluctance motor, due to the low rotation speed of the switched reluctance motor, the speed-increasing effect of the gear speed regulating mechanism can increase the rotation speed of the agitator 7, thereby increasing the movement speed of the crushing medium, thereby improving the grinding effect of the crushing part.

[0102] In the embodiment of the present application, the measuring device measures the power required to grind a unit mass of the material to be tested to a target fineness at a fixed stirring rate, and the rotation rate of the stirrer 7 is preferably 200 r / min.

[0103] In some possible embodiments provided in the present application, the measuring device further includes: a second adjusting unit 12, which is connected to the input circuit of the crushing part and is used to adjust the input frequency of the crushing part.

[0104] The second regulating unit 12 may include an infrared speed measuring device and a variable speed controller. The infrared speed measuring device is used to monitor the stirring speed of the stirring spindle 6 in real time, and the variable speed controller is used to finely control the stirring rate of the stirring spindle 6 .

[0105] Specifically, the variable speed controller is electrically connected to the input circuit of the stirring motor 10. In the embodiment of the present application, the stirring speed is first fed back by the infrared speed measuring device, and then the stirring rate is adjusted by adjusting the input frequency or current of the stirring motor 10 through the variable speed controller. The stirring rate can be determined according to the grinding rate requirement.

[0106] The measuring device measures the power required to grind a unit mass of the material to be tested to a target fineness at a fixed stirring rate, and the stirring spindle 6 can stir the crushing medium at a medium speed of 120 to 300 r / min.

[0107] Specifically, in the embodiment of the present application, the stirring main shaft 6 rotates at a speed of 200 r / min.

[0108] In the above embodiment, the crushing shell 4 includes: a first cylinder 41; a second cylinder 42, and the second cylinder 42 is movably arranged in the first cylinder 41 and can move along the length direction of the second cylinder 42.

[0109] The first cylinder 41 is an outer cylinder, and a base is provided at the bottom of the first cylinder 41 . The base is provided to improve the working stability of the measuring device.

[0110] The second cylinder 42 is an inner cylinder, and a stirring and grinding chamber 5 is formed in the second cylinder 42 . The material to be tested, the stirring main shaft 6 and the stirrer 7 are arranged in the second cylinder 42 .

[0111] Specifically, the first cylinder 41 and the second cylinder 42 are cylindrical structures, the diameter of the first cylinder 41 is set to 310-820 mm, and the diameter of the second cylinder 42 is 300-800 mm. The second cylinder 42 needs to be easy to nest into the first cylinder 41 and the gap between the two is small; preferably, the first cylinder 41 and the second cylinder 42 are made of 5 mm thick stainless steel plate, the diameter of the second cylinder 42 is 400 mm, and the diameter of the first cylinder 41 is selected to be 412 mm; the second cylinder 42 is configured with steel balls with a filling rate of 35-75% as the crushing medium, and the preferred filling rate is 60%; the crushing medium is steel balls of different diameters of 4-12 mm, and the steel balls of 4mm:6mm:8mm with a mass ratio of 1:1:1 are preferably filled.

[0112] The bottom of the second cylinder 42 is provided with a filtering unit 421 , which may be a fine mesh.

[0113] Specifically, the second cylinder 42 is movably connected to the first cylinder 41. When stirring is stopped, the second cylinder 42 can move away from the machine base along the axial direction of the first cylinder 41 to separate the grinding medium and the grinding product, thereby preventing the grinding medium from being mixed with the ground material to be tested and discharged from the crushing shell 4, thereby improving the stability of the crushing part.

[0114] Among them, the crushing shell 4 also includes a cover plate, which is detachably connected to the first cylinder 41 and is arranged on the side of the first cylinder 41 away from the machine base. By setting the cover plate, the splashing of the material to be measured during the grinding process can be avoided, thereby improving the stability of the measuring device.

[0115] In some possible embodiments provided in the present application, the crushing part also includes a lifting assembly 8, which is used to drive the second cylinder 42 to move; wherein the lifting assembly 8 includes a lifting screw 82 and a lifting nut 81, the lifting screw 82 is threadedly connected to the lifting nut 81, the lifting nut 81 is fixedly set on the first cylinder 41, and the lifting screw 82 is connected to the second cylinder 42.

[0116] By providing the lifting assembly 8, the second cylinder 42 can be driven to move, so that the second cylinder 42 can be lifted relative to the first cylinder 41, thereby achieving separation of the ground product and the crushing medium.

[0117] Among them, the lifting assembly 8 includes a lifting screw 82 and a lifting nut 81. The lifting screw 82 is connected to the second cylinder 42 and is arranged on the side of the second cylinder 42 away from the machine base; the lifting nut 81 is connected to the first cylinder 41 and is arranged on the side of the first cylinder 41 away from the machine base.

[0118] Specifically, the lifting nut 81 is sleeved on the lifting screw 82, and the lifting screw 82 is threadedly connected to the lifting nut 81 to realize the rotation of the lifting screw 82. The lifting screw 82 can move along the axial direction of the lifting screw 82, thereby driving the second cylinder 42 connected thereto to move. In the present application, the first cylinder 41 serves to nest and stabilize the second cylinder 42; the lifting screw 82 is installed on the upper end of the second cylinder 42, and a fine screen smaller than the size of the crushing medium is installed at the bottom. The function of the bottom fine screen is to separate the ground product from the crushing medium. It is a flat screen with fine holes and is made of the same type of material as the second cylinder 42; the size of the screen hole is 1 / 2 to 1 / 3 smaller than the diameter of the minimum crushing medium used; during the stirring and grinding process, the bottom of the second cylinder 42 is tightly fitted with the second cylinder 42. After the grinding is completed, the second cylinder 42 is lifted relative to the outer cylinder by the lifting screw 82 of the second cylinder 42 to separate the ground product from the crushing medium.

[0119] In some possible embodiments provided in the present application, the crushing part further includes: an adjusting plate 9, which is movably connected to the crushing shell 4, and the adjusting plate 9 can be selectively set at a first height or a second height to adjust the effective volume of the stirring and grinding chamber 5.

[0120] The adjustment plate 9 may be rectangular or circular, etc., and this application does not make any further limitations.

[0121] The adjusting plate 9 is arranged in the crushing shell 4 and is movably connected to the crushing shell 4 so that the adjusting plate 9 can move along the axial direction of the crushing shell 4 and be fixed at a preset position, thereby being able to adjust the effective volume of the stirring and grinding chamber 5.

[0122] Specifically, in one embodiment, the adjustment plate 9 is slidably connected to the crushing shell 4 so that the adjustment plate 9 can slide along the axial direction of the crushing shell 4. In another embodiment, a through slot is formed on the crushing shell 4, which penetrates the crushing shell 4 in the radial direction of the crushing shell 4. The adjustment plate 9 can be inserted into the crushing shell 4 through the through slot. In this case, at least a portion of the adjustment plate 9 is located outside the crushing shell 4 to fix the adjustment plate 9 in a set position. In this embodiment of the present application, the adjustment plate 9 can be inserted into the crushing shell 4 through the through slot.

[0123] There are two through slots, one at the first height of the crushing shell 4 and the other at the second height of the crushing shell 4, so that the adjustment plate 9 can be selectively set at the first height and the second height according to actual needs.

[0124] Specifically, by providing an adjustment plate 9 that is movably connected to the crushing shell 4, the adjustment plate 9 can be fixed at different heights of the crushing shell 4, thereby adjusting the height of the stirred mill chamber 5. This allows the measuring device to measure the unit power consumption values of vertical stirred mill equipment models with different diameter / height ratios, thereby improving the user experience and expanding the applicability of the measuring device. The present application adopts a height-variable crushing shell 4 design, making it compatible with large-scale equipment structures, which is beneficial for the selection and scale-up of similar structure stirred mills based on the specific power consumption method based on unit power consumption values.

[0125] Among them, the ratio of the diameter to the height of the second cylinder 42 is 1:(0.8-3.0). In the embodiment of the present application, it is preferred that the diameter to height of the second cylinder 42 is 1:1.2.

[0126] In the above embodiment, the measuring device also includes: a grading unit 13; a grading feeding pump 14, one end of the grading feeding pump 14 is connected to the discharge port 44 of the crushing part, and the other end is connected to the inlet of the grading unit 13; a circulating feeding pump 15, one end of the circulating feeding pump 15 is connected to the feed port 43 of the crushing part, and the other end is connected to the first outlet of the grading unit 13.

[0127] By providing the classification unit 13, the ground product can be classified into particle sizes, so that the ground product that does not meet the target fineness can be transported to the crushing part through the circulating feed pump 15 for secondary grinding until the target fineness requirement is met, thereby improving the accuracy of the measurement result.

[0128] The classification unit 13 may be a classifier.

[0129] Specifically, the classifier is connected to the discharge port 44 of the crushing part through the classifying feed pump 14, and the ground product can be transported to the classifier through the feed pump. In the embodiment of the present application, the classifier adopts a hydrocyclone, and the classification particle size is adjusted by adjusting the delivery pressure of the classifying feed pump 14.

[0130] The classifier has a first outlet and a second outlet, the target material is discharged from the second outlet, and the process material is discharged from the first outlet.

[0131] Among them, the target material is the material to be tested whose particle size reaches the target fineness requirement after grinding; the process material is the material to be tested whose particle size does not reach the target fineness requirement after grinding.

[0132] Specifically, the first outlet of the classifier is connected to the feed port 43 of the crushing section via a circulating feed pump 15, which is used to transport the process material back to the crushing section for secondary grinding. In this application, the unit power consumption of the vertical mixing equipment is measured through multiple grinding cycles, overcoming the risk of amplifying the unit power consumption values of traditional stirred mills, making the grinding process closer to actual power consumption and production practice, and measuring power consumption data more accurately. It also overcomes the shortcomings of the current open-circuit power consumption measurement method using the specific power consumption method.

[0133] In the above embodiment, the measuring device also includes: a grinding product charging bin 16, which is connected to the discharge port 44 of the crushing part and is used to store the grinding product; a grading sand collection bin 17, which is arranged between the circulating feed pump 15 and the grading unit 13 and is used to store process materials; and a grading overflow collection bin 18, which is connected to the second outlet of the grading unit 13 and is used to store the target material.

[0134] Among them, the grinding product charging bin 16 is used to store grinding products, providing a stable setting position for grinding products; the graded sand collection bin 17 is used to store process materials, providing a stable setting position for process materials; the graded overflow collection bin 18 is used to store target materials, providing a stable setting position for target materials.

[0135] Specifically, the top of the grinding product charging bin 16 is connected to the discharge port 44 of the crushing section, and the bottom of the grinding product charging bin 16 is connected to the grading feeding pump 14; the top of the grading grit collecting bin 17 is connected to the first outlet of the grading unit 13, and the bottom of the grading grit collecting bin 17 is connected to the feeding port 43 of the crushing section; and the grading overflow collecting bin 18 is connected to the second outlet of the grading unit 13. In the present application, the ground product in the crushing section passes through the filtration unit 421 and enters the grinding product charging bin 16, and is then pumped into the classifier unit by the grading feeding pump 14 for particle size classification. The process material obtained by classification enters the grading grit collecting bin 17 through the first outlet, and is fed into the stirring grinding chamber 5 through the feeding port 43 by the circulating feeding pump 15. At this time, the material to be tested undergoes secondary circulation stirring and grinding; the overflow product from the second outlet of the classifier is collected in the grading overflow collecting bin 18 and collected as the target material.

[0136] See also Figure 3 As shown, another aspect of an embodiment of the present application provides a measurement method, which is applied to any of the above-mentioned measurement devices.

[0137] The measurement method provided in the embodiments of the present invention is applied to a measuring device capable of measuring the power required to grind a unit mass of the material to be tested to a target fineness. It is applicable to the power measurement of stirred fine grinding of fine-grained materials (materials below 0.074 mm). The D50 particle size or specific surface area of the fine-grained material is used as the main characterization parameter of the fineness, and the relationship between the surface increase and power consumption during the fine grinding process of the material to be tested is constructed. The measured parameters are closer to the energy transfer process of material fine grinding and the area theory. At the same time, the unit power consumption of the stirred mill is calculated by multiple grinding cycles, overcoming the risk of numerical amplification of the unit power consumption of the traditional stirred mill, making the grinding process closer to the actual power consumption and production practice, and the measured power consumption data is more accurate, and overcoming the shortcomings of the current open-circuit power consumption measurement method of the specific power consumption method.

[0138] Methods include:

[0139] Step S101: obtaining the median diameter information of the material to be tested.

[0140] The median diameter is the average particle size of the material to be measured. It can be understood that the median diameter information of the material to be measured can be used to characterize the surface area of the material to be measured.

[0141] Specifically, a laser particle size analyzer or a wet sieving method can be used to measure the particle size (D5, D50, D97) of the material to be tested and the particle size distribution curve of the raw material to obtain the D50 value of the raw material.

[0142] Among them, the D50 value is the average particle size value in the material to be tested.

[0143] Step S201: Develop the median diameter information of the target material.

[0144] Among them, the average particle size of the target material is Dp50.

[0145] Specifically, let's take the example of measuring the power required to grind a unit mass of material to 80% of -0.038mm. Before grinding, the material to be tested has a -0.038mm fraction of 40%, and its measured D50 is 0.10mm. The work index for 80% of -0.038mm needs to be measured. A preliminary target Dp50 of 0.02mm can be set for grinding to 90% of -0.038mm. It's preferable to select a final measured fineness lower than the required fineness.

[0146] Step S301: setting at least five preset finenesses based on the median diameter information of the material to be tested and the median diameter information of the target material.

[0147] At least five preset finenesses are divided in equal proportion between the Dp50 of the target material and the D50 of the material to be tested.

[0148] Among them, at least five preset fineness calculation formulas are:

[0149] D Pn+1 =D Pn -[exp(D50-Dp50) / 5*D Pn ]

[0150] Among them, D Pn+1 is the grinding fineness relative to D Pn The next fineness point after increase, n=1,2,3,4.

[0151] Among them, D P1 It is the first point after grinding relative to the raw material D50.

[0152] Specifically, D P1 =D50-D50*exp[(D50-Dp50) / 5]=0.1-0.1[*exp(0.1-0.02) / 5]=0.078mm; Similarly, D P1 (D50=0.078mm), D P2 (D50=0.061mm), D P3 (D50=0.048mm), D P4 (D50=0.037mm), D P5 (D50=0.020mm).

[0153] Among them, it is necessary to separately P1 、D P2 、D P3 、D P4 、D P5 The unit power consumption of the stirred mill is measured under the grinding fineness. P1 The measurement of unit power consumption under grinding fineness is taken as an example for specific explanation. The measurement method is the same for other fineness conditions.

[0154] Step S401: obtaining particle size information of the material to be tested when it is ground to a preset fineness.

[0155] In this application, the type of stirred mill is first selected, and the stirring power and the type of stirrer 7 thereof are selected, and then one of the stirring rod, stirring disk and stirring spiral is selected to be installed on the stirring main shaft 6, and the diameter / height of the required stirred mill structure is adjusted based on the position of the adjustment plate 9; then the crushing medium with an appropriate weight-to-ball-diameter ratio is configured, and the crushing medium is added to the second cylinder 42; preferably, the diameter of the second cylinder 42 is 400 mm, the height is adjusted to 400 mm, the filling rate of the ball milling medium is 60%, and the ball diameter of the ball milling medium is steel balls in a mass ratio of 4 mm: 6 mm: 8 mm = 1:1:1; then the second cylinder 42 is lowered so that the fine screen at the bottom of the second cylinder 42 fits with the bottom of the second cylinder 42, and the cover is covered. The material to be tested is then slurried and introduced into the second cylinder 42 of the crushing section through the feed port 43 for the first open-circuit stirring and grinding. Preferably, a 4L volume of the material to be tested is added based on the loose bulk volume of the object to be tested, and the mass m0 of the added material to be tested is weighed. Then, the required measured mass of water is added based on the weight of the added material to be tested and the required grinding slurry ratio. Preferably, the mass concentration of the stirring and grinding slurry is adjusted to 65%. During the stirring and grinding process, a power collector can be used to collect and record the input power of the rotational torque of the grinding process in real time, and the cumulative input power can be calculated. Simultaneously, a variable speed regulator is used to measure the stirring rate with an infrared tachometer. By adjusting the input frequency method, the stirring rate of the stirring spindle 6 is regulated to achieve relative movement between the crushing medium and the material to be tested to produce fine grinding of the material. The total number of stirring cycles is accumulated and recorded during the process. Preferably, the stirring rate is 200r / min, and the grinding power is measured at a fixed stirring rate. After the material to be tested is stirred and ground for a specified time, the specific grinding time T0 is recorded and the ground sample is collected from the sampling port. During the process, the sample can be sampled by a micro-negative pressure pump and transported to the laser particle size analyzer for analysis and measurement of the particle size (D5, D50, D97), particle size distribution and specific surface area of the ground sample;

[0156] Among them, D5 and D97 are mainly used to obtain relatively fine particle size distribution characteristics of the ground products, in order to prove the feasibility of using D50 to characterize the specific surface area of the ground products. Subsequently, the measuring device is controlled to stop and the lifting assembly 8 is used to lift the fine screen at the bottom of the second cylinder 42 to separate the crushing medium and the grinding material. The material discharged from the first open-circuit grinding is introduced into the grinding product charging bin 16 and slurried to a mass concentration of 10% to 20%, wherein the mass concentration of the classified ore slurry is preferably adjusted to 15%; the ground product is then pumped into the classifier through the grading feed pump 14 for classification, and the classification particle size is adjusted by adjusting the feed pump input pressure, wherein the classification particle size selects the D97 value of the required fineness of the material to be measured. For example, if the required grinding fineness of -0.038mm accounts for 90% of the unit grinding power consumption, D97 = 0.045mm is preferably selected as the classification particle size for this test. The first grinding sand and the first grinding overflow are obtained by classification. The first grinding sand is set in the grading sand collection bin 17 and then transferred into the second cylinder 42 of the crushing part through the circulating feed pump 15 through the feed port 43. Then the collected classified overflow is dried and weighed to record the mass m2, and in the second grinding, the raw ore sample of mass m2 is added to the second cylinder 42, so that the grinding material is the sedimentation material m1 classified by the first grinding + the raw material of the supplement m2, where m1 + m2 should be equal to the mass m0 of the material to be tested added in the first grinding, and then the second cycle grinding is carried out, the stirring grinding and measuring operation cycle is carried out, and multiple material returns and cyclic stirring grinding are carried out; in the process, the grinding time T is mainly adjusted. n , so that the measured particle size D50 of the ground product is equal to or close to D P1 Value, preferably, when the measured particle size of the ground product D50>D P1 When the grinding time T is increased, when D50 <D P1 When the grinding product D50 is equal to or close to D P1 value, and the overflow output after classification should tend to be balanced, the grinding circulation material tends to be stable, the quality difference of the overflow output after classification of the three stirring and grinding products is ±2%, and the grinding circulation volume is between 248%-250%, which is regarded as grinding balance, thereby obtaining the grinding time Tn required for the final balance, the (D5, D50, D97) particle size of the grinding product and its particle size distribution curve, and the specific surface area value of the product.

[0157] Step S501: Calculating the unit power consumption when the material to be tested is ground to a preset fineness.

[0158] The unit power consumption calculation formula is:

[0159] W Dp1 =A*P*T n / (m0 / M)

[0160] Among them, WDp1 Grind the material to be tested to D P1 The unit power consumption value is kW·h / t; A is the useful power adjustment coefficient of the stirring and grinding effect on the surface area increase, which is between 0.9 and 0.98; P is the measured stirring power, W; T n is the grinding time at grinding equilibrium determined by the experiment, h; m0 is the mass of the material to be tested; M is the unit mass of the material to be tested, t.

[0161] Step S601: determining a linear relationship between different grinding finenesses of the material to be tested and the unit power consumption values based on the particle size information and unit power consumption values corresponding to at least five preset finenesses.

[0162] Among them, in this application, the above method can be used to sequentially measure the grinding of the material to be tested to D by the measuring device. P1 、D P2 、D P3 、D P4 、D P5 The unit energy consumption index is expressed as D P1 ~D P5 The value corresponding to the fineness ratio of -0.038mm is the horizontal axis x, and the corresponding fineness D of the material to be tested is P1 ~D P5 The unit power consumption value under is the vertical coordinate y, and a unit power consumption relationship curve is drawn. Then, a linear fit of y=ax+b is performed to obtain the relevant straight line relationship, thereby calculating the unit power consumption value when the material to be tested is ground to the target fineness, that is, the power required to grind the unit mass of the material to be tested to the target fineness.

[0163] For details, see Figure 4 As shown, Figure 4 This is a simulation experiment diagram of iron sulfide concentrate. Figure 4 A1 is the relationship curve between the iron sulfide concentrate ground to different -0.038mm ratios and unit power consumption obtained by the measurement method in this application. Figure 4 Figure A2 shows the relationship between the specific power consumption and the grinding time of iron sulfide concentrate to different -0.038mm ratios, obtained using a related measurement method. Comparing curves A1 and A2, we can see that the measurement method in this application reduces the risk of exaggerating the specific power consumption of traditional stirred mills, making the grinding process more closely aligned with actual power consumption and production practices, and providing more accurate power consumption data. It also overcomes the shortcomings of the current specific power consumption method, which measures power consumption in an open circuit.

[0164] Obtain particle size information when the material to be tested is ground to a preset fineness, including:

[0165] Step S4011: Obtaining a target fineness ratio value when the material to be tested is ground to a preset fineness.

[0166] The preset fineness can be the average particle size of the material to be tested ground to D P1 、D P2 、D P3 、D P4 or D P5 Time-detailed information.

[0167] The target fineness can be the fineness information of the target material.

[0168] Specifically, in the embodiment of the present application, the target fineness is 0.038 mm. A laser particle size analyzer or a wet sieving method can be used to draw a particle size distribution curve of the material when the material to be tested is ground to a preset fineness and balanced, so as to analyze the target fineness ratio when the material to be tested is ground to a preset fineness, that is, the average particle size of the material to be tested is ground to D P1 、D P2 、D P3 、D P4 or D P5 The corresponding proportion of -0.038mm material.

[0169] Among them, the overflow output of multiple cycle classification tends to be balanced, the grinding cycle material tends to be stable, the quality difference of the overflow output after classification of the three stirring and grinding products is ±2%, and the grinding cycle volume is between 248%-250%, which is considered to be grinding balance.

[0170] Calculate the unit power consumption when the material to be tested is ground to a preset fineness, including:

[0171] Step S5011: Obtain the mass of the material to be tested.

[0172] The mass of the material to be measured is m0, which can be obtained by weighing.

[0173] Among them, m0=m1+m2.

[0174] Specifically, m1 is the mass of the sediment material separated from the first grinding and classification, and m2 is the mass of the raw material added during the second grinding. It will be appreciated that the measuring device can perform multiple grinding cycles until the fineness of the ground product reaches a predetermined fineness requirement. At this point, m0 is the sum of the mass of the sediment material and the mass of the added raw material from the multiple grinding cycles.

[0175] Step S5012: obtaining the power output by the crushing part when the material to be tested is ground to a preset fineness.

[0176] The power output by the crushing part may be the power for driving the stirring main shaft 6 to rotate.

[0177] Specifically, during the stirring and grinding process, a power collector can be used to collect and record the input power of the grinding process in real time, and calculate the average input power of the cyclic grinding.

[0178] Step S5013: Determine the grinding time required to grind the material to be tested to a preset fineness.

[0179] Among them, the grinding time required to grind the material to the preset fineness is T n .

[0180] Specifically, T n It is the time required for grinding equilibrium obtained after multiple grinding cycles.

[0181] Step S5014: Calculate the unit power consumption value based on the mass of the material to be tested, the power output by the grinding part, and the grinding time.

[0182] The formula for calculating the unit power consumption is:

[0183] W Dp1 =A*P*T n / (m0 / M)

[0184] Among them, W Dp1 Grind the material to be tested to D P1 The unit power consumption value is kW·h / t; A is the useful power adjustment coefficient of the stirring and grinding effect on the surface area increase, which is between 0.9 and 0.98; P is the measured stirring power, W; T n is the grinding time at grinding equilibrium determined by the experiment, h; m0 is the mass of the material to be tested; M is the unit mass of the material to be tested, t.

[0185] An embodiment of the present invention provides a measuring device and a measuring method, wherein the measuring device is mainly capable of collecting the input power of the crushing part and detecting the specific surface area of the material to be measured by setting a collection unit 1 and a detection unit 2, so that the staff can accurately measure the power required to grind the unit mass of the material to be measured to the target fineness based on the relationship between the specific surface area of the material to be measured and the input power, thereby avoiding the situation where the vertical stirred mill equipment is selected too large, improving the grinding efficiency of the vertical stirred mill equipment, and thus reducing the cost of ultrafine grinding of materials. The measurement method is applied to a measuring device that can measure the power required to grind a unit mass of the material to be tested to the target fineness. It is applicable to the power measurement of fine-grained materials (materials below 0.074 mm) during stirring and fine grinding. The D50 particle size or specific surface area of the fine-grained materials is used as the main characterization parameter of the fineness, and the relationship between the surface increase and power consumption during the fine grinding process of the material to be tested is constructed. The measured parameters are closer to the energy transfer process of material fine grinding and the area theory. At the same time, the unit power consumption of the stirred mill is calculated by multiple grinding cycles, which overcomes the risk of numerical amplification of the unit power consumption of traditional stirred mills, makes the grinding process closer to actual power consumption and production practice, and makes the measured power consumption data more accurate. It also overcomes the shortcomings of the current open-circuit power consumption measurement method of the specific power consumption method.

[0186] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0187] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A measurement method for a vertical stirred mill, characterized in that: A measuring device is included, the measuring device comprising: A crushing part, which is used to crush the material to be tested; A collection unit (1), the collection unit (1) is connected to the input circuit of the crushing part and is used to collect power input information of the crushing part; A detection section, the detection section comprising a detection unit (2) and a conveying unit (3), one end of the conveying unit (3) being connected to the detection unit (2), and the other end being connected to the crushing section, the conveying unit (3) being used to transport at least a portion of the crushed material to be tested to the detection unit (2), and the detection unit (2) being used to detect the specific surface area of the material to be tested; The measuring method comprises: Obtaining median diameter information of the material to be tested; Propose the median diameter information of the target material; Setting at least five preset finenesses based on the median diameter information of the material to be tested and the median diameter information of the target material; Obtaining particle size information of the material to be tested when it is ground to the preset fineness; Calculating the unit power consumption value when the material to be tested is ground to the preset fineness; Determine the linear relationship between different grinding finenesses of the material to be tested and the unit power consumption values based on the particle size information and unit power consumption values corresponding to at least five of the preset finenesses; The calculating of the unit power consumption value when the material to be tested is ground to the preset fineness includes: Obtaining the mass of the material to be tested; Obtaining the power output by the crushing part when the material to be tested is ground to the preset fineness; Determining the grinding time required to grind the material to be tested to the preset fineness; The unit power consumption value is calculated based on the mass of the material to be measured, the power output by the crushing part and the grinding time.

2. The measuring method according to claim 1, wherein The crushing part includes: A crushing shell (4), wherein a stirring grinding chamber (5) is formed in the crushing shell (4); A plurality of crushing media, wherein the plurality of crushing media are arranged in the crushing shell (4); A driving assembly, the driving assembly is used to drive a plurality of the crushing media to move in the stirring grinding chamber (5) to grind the material to be tested; Among them, the multiple crushing media include a first crushing medium, a second crushing medium and a third crushing medium, the mass ratio of the first crushing medium, the second crushing medium and the third crushing medium is 1:1:1, and the diameter ratio of the first crushing medium, the second crushing medium and the third crushing medium is 2:3:

4.

3. The measuring method according to claim 2, characterized in that The drive assembly includes: Stirring motor (10); A stirring main shaft (6), the stirring main shaft (6) is arranged in the stirring grinding chamber (5) and connected to the stirring motor (10); A stirrer (7), wherein the stirrer (7) is arranged on the stirring main shaft (6).

4. The measuring method according to claim 3, characterized in that The stirring main shaft (6) is provided with a plurality of slots (61), the plurality of slots (61) being evenly arranged along the axial direction of the stirring main shaft (6) and staggered along the radial direction of the stirring main shaft (6), and the stirrer (7) is connected to the stirring main shaft (6) via the slots (61).

5. The measuring method according to claim 3, characterized in that The drive assembly further includes: A first regulating unit (11), wherein the output end of the stirring motor (10) is connected to the stirring main shaft (6) via the first regulating unit (11), and the first regulating unit (11) is used to regulate the rotation speed of the stirring main shaft (6).

6. The measuring method according to claim 2, characterized in that The crushing shell (4) comprises: a first cylinder (41); The second cylinder (42) is movably arranged in the first cylinder (41), and the second cylinder (42) is capable of moving along the length direction of the second cylinder (42).

7. The measuring method according to claim 6, characterized in that The bottom of the second cylinder (42) is provided with a filtering unit (421).

8. The measuring method according to claim 6, characterized in that The crushing part further comprises a lifting assembly (8), and the lifting assembly (8) is used to drive the second cylinder (42) to move; The lifting assembly (8) comprises a lifting screw (82) and a lifting nut (81), wherein the lifting screw (82) is threadedly connected to the lifting nut (81), the lifting nut (81) is fixedly arranged on the first cylinder (41), and the lifting screw (82) is connected to the second cylinder (42).

9. The measuring method according to claim 2, characterized in that: The crushing unit also includes: An adjusting plate (9), the adjusting plate (9) being movably connected to the crushing shell (4), and the adjusting plate (9) being selectively arranged at a first height or a second height to adjust the effective volume of the stirring grinding chamber (5).

10. The measurement method according to claim 1, characterized in that Also includes: Grading Unit (13); a grading feeding pump (14), one end of the grading feeding pump (14) being connected to the discharge port (44) of the crushing part, and the other end of the grading feeding pump (14) being connected to the inlet of the grading unit (13); A circulating feed pump (15), one end of which is connected to the feed port (43) of the crushing section, and the other end of which is connected to the first outlet of the classification unit (13).

11. The measuring method according to claim 10, characterized in that: Also includes: a grinding product charging bin (16), the grinding product charging bin (16) being connected to the discharge port (44) of the crushing section and being used for storing the grinding product; A classification sand collection bin (17), the classification sand collection bin (17) being arranged between the circulating feed pump (15) and the classification unit (13) and being used for storing process materials; A grading overflow collection bin (18), the grading overflow collection bin (18) is connected to the second outlet of the grading unit (13) and is used for storing target materials.

12. The measuring method according to claim 1, characterized in that Also includes: A second regulating unit (12), the second regulating unit (12) is connected to the input circuit of the crushing part and is used to regulate the input frequency of the crushing part.

13. The measuring method according to claim 1, characterized in that The obtaining of particle size information of the material to be tested when it is ground to the preset fineness includes: Obtain the target fineness ratio when the material to be tested is ground to the preset fineness.

Images