Powder classifier stator positioning device

Abstract

The present invention provides a stator positioning device for a powder classifier, comprising: a positioning device, the cross section of the positioning device is annular, the inner surface of the positioning device is connected to the outer surface of the stator and positions the stator. The positioning device is formed by connecting a plurality of positioning plates end to end in sequence, and the cross section of the positioning plate is a fan ring. The stator includes a plurality of blade assemblies, and the blade assembly specifically includes a blade shaft, a blade connecting plate, and a blade, and the blade shaft is connected to the blade through the blade connecting plate; a matching groove that matches the blade assembly is provided on the inner side surface of the positioning plate; wherein the axis of the blade shaft is perpendicular to the upper surface of the positioning plate, and the blade shaft extends into the matching groove and is fixedly connected by welding. The stator positioning device for a powder classifier proposed by the present invention has a simple structure, low manufacturing cost, is easy to install, reduces the equipment failure rate, increases the service life of the stator blades, and improves product quality.

Description

Technical Field

[0001] The invention belongs to the technical field of slag micro-powder classifier equipment, and in particular relates to a stator positioning device of a classifier. Background Art

[0002] Slag powder is a powder product obtained by grinding blast furnace water-quenched slag in a mill and then screening it through a powder selector. It has good activity and is usually used as an admixture for cement concrete. The main technical indicators of the product include specific surface area, 7D activity, etc. In actual production, the working state of the powder selector has a significant impact on the output and quality of slag powder.

[0003] The slag powder concentrator has 60 stator blades, evenly distributed on a circumference of ￠6300mm and a height of 3750mm. Its main function is to form a reasonable airflow distribution through the rotation of the stator blades, so that the coarse and fine particle powders can be separated efficiently. Among them, the stable stator blade angle is crucial to the airflow. In the prior art, the stator blades are fixed by the blade positioning shaft and the blade connecting plate. In summary, there are the following main features and disadvantages:

[0004] (1) The single-piece stator blades are relatively long, and the friction of the high-speed vortex airflow easily causes the blades to wear and skew, which destroys the airflow distribution inside the powder concentrator, directly leading to poor quality of the micro powder, mainly because the specific surface area does not meet the requirements and the 7D activity is poor;

[0005] (2) The stator blades are mainly fixed by the positioning shaft. The scattered stator blades may be unevenly stressed, which may easily cause the positioning shaft to break, causing the powder classifier to vibrate and rub against the rotor blades. In severe cases, the machine needs to be shut down for treatment and re-fixed;

[0006] (3) The stator blades have a short service life, a high failure rate, and usually a long time to handle the failures, which seriously affects production efficiency. Summary of the invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0008] In view of this, an object of the present invention is to provide a stator positioning device for a powder classifier.

[0009] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides a powder classifier stator positioning device, including: a positioning device, the cross-section of the positioning device is annular, the inner surface of the positioning device is connected to the outer surface of the stator and positions the stator.

[0010] Furthermore, the positioning device is formed by connecting a plurality of positioning plates end to end in sequence, and the cross section of the positioning plate is a fan ring.

[0011] Furthermore, the stator includes a plurality of blade assemblies, and the blade assembly specifically includes a blade shaft, a blade connecting plate, and a blade, wherein the blade shaft is connected to the blade through the blade connecting plate; a matching groove that matches the blade assembly is provided on the inner side surface of the positioning plate; wherein the axis of the blade shaft is perpendicular to the upper surface of the positioning plate, and the blade shaft extends into the matching groove and is fixedly connected by welding.

[0012] Furthermore, each positioning plate is provided with a plurality of matching grooves on the inner side surface, and the matching grooves are composed of a first plane, an arc surface, and a second plane connected in sequence, and the centers of each arc surface at the same horizontal position are connected to form a first circle. The distance between the centers of any two adjacent arc surfaces is equal, and the first circle at the same horizontal position, the inner surface of the positioning device, and the outer surface of the positioning device share a common center.

[0013] Furthermore, the two ends of the arc surface are tangent to the first plane and the second plane respectively, and the second plane forms a first preset angle with the first plane; in any connected blade assembly and the matching groove, the blade forms a second preset angle with the first plane.

[0014] Furthermore, it also includes: an auxiliary plate, which is used to assist in adjusting the angle between the blade and the first plane when the positioning plate is welded to the blade assembly.

[0015] Furthermore, a protrusion is provided at the first end of the positioning plate, and a recess is provided at the second end of the positioning plate. Among any two adjacent positioning plates, the protrusion of one positioning plate extends into the recess of the other positioning plate and is fixedly connected by welding.

[0016] Furthermore, the blade connecting plate is detachably connected to the blade; the thickness of the positioning plate ranges from 10 mm to 12 mm.

[0017] Furthermore, at least two groups of positioning devices are arranged at intervals along the length direction of the blade assembly; and the positioning plates in two adjacent positioning devices are arranged alternately along the length direction of the blade assembly.

[0018] Furthermore, the number of blade assemblies is 60; each positioning device includes 15 positioning plates, and each positioning plate is provided with four matching grooves; wherein each positioning plate is welded to 4 blade assemblies, and the matching grooves fit with the outer surface of the blade shaft.

[0019] The beneficial effects of the technical solution provided by the embodiment of the present invention are: the blades are fixed by two layers of positioning plates to prevent the blades from being worn, skewed, etc. under the friction of the high-speed vortex airflow, thereby stabilizing the airflow distribution inside the powder classifier, helping to improve product quality, increasing the equipment service life, and ensuring the equipment operation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A schematic structural diagram showing a stator positioning device for a powder selector from a front view perspective according to an embodiment of the present invention;

[0021] Figure 2 A schematic diagram showing a structure of a stator positioning device for a powder classifier from a top view according to an embodiment of the present invention;

[0022] Figure 3 Shows Figure 2 A partial enlarged schematic diagram of part A;

[0023] Figure 4 A schematic structural diagram of a positioning plate according to an embodiment of the present invention is shown;

[0024] Figure 5 A schematic structural diagram of a positioning plate according to another embodiment of the present invention is shown;

[0025] Figure 6 A schematic diagram showing the cooperation between the protruding parts and the recessed parts of two positioning plates according to an embodiment of the present invention is shown;

[0026] Figure 7 A schematic structural diagram of a positioning plate according to another embodiment of the present invention is shown;

[0027] Figure 8 A schematic structural diagram of a positioning plate according to a specific embodiment of the present invention is shown;

[0028] Fig. 9 A schematic structural diagram showing a main viewing angle of an auxiliary plate of an embodiment of the present invention;

[0029] Fig.10 A schematic structural diagram of a left-viewing angle of an auxiliary board according to an embodiment of the present invention is shown.

[0030] The symbols in the figure are explained as follows:

[0031] 10 stator, 1 blade assembly, 12 blade shaft, 14 blade connecting plate, 16 blades, 3 positioning plates, 32 inner side surface, 34 outer side surface, 36 first end, 362 protrusion, 38 second end, 382 recess, 310 matching groove, 312 first plane, 314 arc surface, 316 second plane, 30 positioning device, 302 first circle, 4 auxiliary plates, 42 main plate, 421 protrusion, 4211 long side, 422 main body, 4221 first straight surface, 4222 second straight surface, 4223 third straight surface, 4224 inclined surface, 44 auxiliary plate, 441 long side surface. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention and their beneficial effects will be further described in detail below with reference to the accompanying drawings.

[0033] like Figure 1 and Figure 2 As shown, one embodiment of the present invention provides a powder classifier stator positioning device, which is used in a slag micro-powder classifier and plays a role in positioning the stator of the powder classifier.

[0034] The stator positioning device of the powder classifier includes: a positioning device 30, the cross-section of the positioning device 30 is annular, the inner surface of the positioning device 30 is connected to the outer surface of the stator 10 and positions the stator 10 to improve the strength of the stator 10, specifically, the blade assembly 1 includes a blade shaft 12, a blade connecting plate 14, and a blade 16, the blade shaft 12 is connected to the blade 16 through the blade connecting plate 14; the positioning device 30 includes a plurality of positioning plates 3, and a plurality of positioning plates 3 are connected end to end to form an annular positioning device 30; wherein, a plurality of blade assemblies 1 are arranged in an annular shape on a plane perpendicular to the length direction of the blade assembly, the axes of all blade shafts 12 are parallel to each other, and each blade assembly 1 is evenly distributed, so that when air passes through the gap between the blade assemblies 1, a reasonable airflow distribution can be provided, so that coarse-grained micro-powder and fine-grained micro-powder are efficiently separated, and the slag is improved. The quality of slag micro-powder screening of the micro-powder classifier; the inner side surface 32 of the positioning plate 3 is provided with a matching groove 310 that matches the blade assembly 1, and the axis of the blade shaft 12 is perpendicular to the upper surface (lower surface) of the positioning plate 3. The blade shaft 12 extends into the matching groove 310 and is fixedly connected to the positioning plate 3 by welding. A plurality of blade assemblies 1 are enclosed in the inner surface of the positioning device 30, so that the positioning device 30 provides support for the blade shaft 12 of the blade assembly 1, reduces the vibration of the blade shaft 12 and the blade 16 under the high-speed vortex airflow, thereby reducing the wear of the blade 16 under the friction of the high-speed vortex airflow, and reduces the possibility of the blade 16 being skewed and the blade shaft 12 being broken, thereby improving the stability of the blade assembly 1, optimizing the airflow distribution inside the classifier, reducing the failure rate of the blade assembly 1, extending the service life of the blade assembly 1, and ensuring the operation rate of the equipment.

[0035] Specifically, the purpose of providing the blade connecting plate 14 is to better replace the blade 16. The blade 16 is detachably connected to the blade connecting plate 14, so that when replacing the blade 16, it is only necessary to remove the blade 16 from the blade connecting plate 14 and replace it with a new blade 16. If the blade 16 is directly connected to the blade shaft 12, it can only be connected by welding, which makes it difficult to replace the blade 16.

[0036] The thickness of the positioning plate 3 ranges from 10 to 12 mm. Specifically, if the thickness is less than 10 mm, the strength does not meet the requirements and is easy to break, and if the thickness is greater than 12 mm, the material is wasted.

[0037] Among them, Figure 3As shown, through the matching method of the blade assembly 1 and the matching groove 310, the installation position of the blade assembly 1 and the positioning plate 3 can be quickly found, thereby improving the efficiency of assembly; a plurality of positioning plates 3 are welded to the blade assembly 1 one by one, and then the adjacent positioning plates 3 are welded for connection, and only welding is required on the basis of the original powder selection machine equipment structure, and no changes are required to the original structure, so as to reduce the manufacturing cost and assembly difficulty, and the matching groove 310 fits with the surface of the blade shaft 12 to facilitate firm welding.

[0038] Optionally, in another specific embodiment, the positioning device 30 is an integrated structure, the mating grooves 310 are evenly arranged on the inner surface of the positioning device 30, the axis of the blade shaft 12 is perpendicular to the upper surface (lower surface) of the positioning device 30 and extends into the mating groove 310 and is fixedly connected to the positioning device 30 by welding, so that the positioning device 30 provides support for the stator 10.

[0039] like Figure 4 As shown, one embodiment of the present invention further defines:

[0040] The plate surface of the positioning plate 3 is fan-shaped, so the contours of the inner side surface 32 and the outer side surface 34 are both arc surfaces, the inner side surface 32 and the outer side surface 34 are co-centered, the inner side surfaces 32 of multiple positioning plates 3 form the inner surface of the positioning device 30, and the outer side surfaces 34 of multiple positioning plates 3 form the outer surface of the positioning device 30. A plurality of matching grooves 310 are provided on the inner side surface 32 of each positioning plate 3. The matching groove 310 is composed of a first plane 312, an arc surface 314 and a second plane 316 connected in sequence. The arc surface 314 is used to fit with the blade shaft 12 to improve the firmness of welding the blade shaft 12 and the matching groove 310. The centers of the circles on each arc surface 314 at the same horizontal position are connected to form a first circle 302. The distance between the centers of any two adjacent arc surfaces 314 is equal, so that when the blade assembly 1 is welded to the matching groove 310 of the positioning plate 3, the plurality of blade assemblies 1 are evenly distributed on the circumference of the first circle 302, that is, the gap between any two adjacent blades 16 is the same, so as to form a reasonable airflow distribution. The first circle 302 at the same horizontal position is co-centered with the inner side surface 32 and the outer side surface 34 of the positioning plate 3.

[0041] The center of the arc surface 314 is determined by the positioning center of the blade shaft 12 from the beginning.

[0042] like Figure 4 As shown, one embodiment of the present invention further defines:

[0043] The two ends of the arc surface 314 are tangent to the first plane 312 and the second plane 316 respectively, and the second plane 316 and the first plane 312 form a first preset angle; in any connected blade assembly 1 and the matching groove 310, the blade 16 and the first plane 312 form a second preset angle. The purpose of setting the second plane 316 is to facilitate the installation of the blade 16 and the space required for adjusting the angle of the blade 16. The purpose of setting the first plane 312 is to fix the blade shaft 12. By making all blades 16 and the first plane 312 form a second preset angle, the two blades 16 are made parallel. The angle between two adjacent blades 16 is between 25° and 30°, and the distance between two adjacent blades 16 is 450mm. After the blades 16 are fixed, the airflow intensity near the surface of the stator 10 is adjusted by adjusting the speed of the rotor to obtain differential particles with different specific surface areas. When the rotor runs at a speed of 100r / min, the specific surface area of ​​the obtained product is 420m 2 / kg~430m 2 / kg, specifically, the airflow near the surface of the stator part (stator 10 of the powder selector) and the materials dispersed in the airflow rotate at high speed together under the drive of the rotor part, so that the micro-powder particles in the airflow are subjected to a strong centrifugal force. When the speed increases, the centrifugal force also increases, and the heavier (or larger) micro-powder particles are subjected to a larger centrifugal force and cannot pass through the blades 16 of the powder selector. At this time, if the processing air volume is kept constant, only smaller micro-powder particles can pass through, and the obtained product becomes finer. The angle and distance between the two blades 16 just determine the airflow intensity near the rotor part. Therefore, the angle and distance between the two blades 16 determine the selectivity of the entire equipment for the finished micro-powder particles.

[0044] like Figure 5 and Figure 6 As shown, one embodiment of the present invention further defines:

[0045] The first end 36 of the positioning plate 3 is provided with a protrusion 362, and the second end 38 of the positioning plate 3 is provided with a recessed portion 382. Among any two adjacent positioning plates 3, the protrusion 362 of one positioning plate 3 extends into the recessed portion 382 of the other positioning plate 3 and is fixedly connected by welding. By providing mutually matching protrusions 362 and recessed portions 382 on the positioning plates 3, when a plurality of positioning plates 3 are assembled to the blade assembly 1, rapid positioning and connection between two adjacent positioning plates 3 can be achieved through the cooperation between the protrusions 362 and the recessed portions 382. After the plurality of positioning plates 3 are enclosed into the positioning device 30, the connecting parts of the protrusions 362 and the recessed portions 382 are welded, and finally the overall fixation between the plurality of positioning plates 3 is achieved. When the positioning plates 3 are welded one by one, the accumulation of dimensional errors caused by assembly errors or improper operation of the welding process is avoided, which eventually leads to the inability of the plurality of positioning plates 3 to be closed into the positioning device 30, or the uneven distribution of different positioning plates 3 leads to the uneven distribution of the blade assembly 1.

[0046] Specifically, Figure 7 As shown, the protrusion 362 is set to be T-shaped, and the recessed portion 382 cooperates with the T-shaped protrusion 362; or as shown in Figure 5 As shown, the protrusion 362 is set to be in a straight line shape, and the recessed part 382 cooperates with the straight-shaped protrusion 362; the protrusion 362 can also be set to be in an S shape, and the recessed part 382 cooperates with the S-shaped protrusion 362. It can be understood that the protrusion 362 and the recessed part 382 can also be set to other shapes, which are not limited here.

[0047] like Fig. 9 and Fig.10 As shown, one embodiment of the present invention further defines:

[0048] The stator positioning device of the powder selector also includes: an auxiliary plate 4, which is used to assist in adjusting the angle between the blade 16 and the first plane 312 when the positioning plate 3 is welded to the blade assembly 1. Specifically, the auxiliary plate 4 is placed between the two blades 16, and then the angle between the two blades 16 is adjusted. When the two blades 16 are attached to the side of the auxiliary plate 4, the distance and angle between the two blades 16 meet the process requirements. The auxiliary plate 4 is composed of an irregular main plate 42 and an auxiliary plate 44. The main plate 42 and the auxiliary plate 44 are fixed by welding, wherein the main plate 42 is in the shape of an irregular plate. The main plate 42 includes a rectangular protrusion 421 and a main body 422 connected to the protrusion 421. The main body 422 is in the shape of a plate, such as Fig. 9As shown, from a front view, the main body 422 includes a first straight surface 4221, a second straight surface 4222, a third straight surface 4223 and an inclined surface 4224, the first straight surface 4221 is parallel to the third straight surface 4223, and the second straight surface 4222 is perpendicular to the first straight surface 4221 and the third straight surface 4223, the inclined surface 4224 is not perpendicular to the first straight surface 4221, the second straight surface 4222 and the third straight surface 4223, and the two long sides 4211 of the protrusion 421 are perpendicular to the first straight surface 4221, and a long side 4211 of the lower part of the protrusion 421 is on the extension line of the second straight surface 4222; Fig.10 As shown, from a left-side perspective, the main body 422 and the protrusion 421 are both rectangular. The auxiliary plate 44 is a rectangular plate, which is welded to the side of the main plate. The two long side surfaces 441 of the auxiliary plate 44 are inclined relative to the second straight surface 4222, and the angle α between the long side surface 441 of the auxiliary plate 44 facing the protrusion 421 and the second straight surface 4222 is greater than 0° and less than 90°. Fig. 9 and Fig.10 As shown, L4 is 20mm, L5 is 10mm, L6 is 90mm, L7 is 80mm, L8 is 105mm, and L9 is 20mm.

[0049] like Figure 1 As shown, one embodiment of the present invention further defines:

[0050] At least two groups of the positioning devices 30 are arranged at intervals along the axial direction of the blade shaft 12, with a gap between two adjacent positioning devices 30, and the positioning plates 3 in two adjacent positioning devices 30 are staggered along the axial direction of the blade shaft 12 to further improve the stability of the positioning blade 16 assembly.

[0051] like Figure 1 and Figure 2 As shown, in a specific embodiment of the present invention, it is further defined that:

[0052] The number of blade assemblies 1 is 60; each positioning device 30 includes 15 positioning plates 3, and the inner side surface 32 of each positioning plate 3 is provided with 4 matching grooves 310; wherein each positioning plate 3 is welded with 4 blade assemblies 1, and the arc angle of the inner side surface 32 and the outer side surface 34 of each positioning plate 3 is 24°, and the contour of the matching groove 310 is highly matched with the outer surface of the blade assembly 1 (the surface of the blade shaft 12), which is convenient for firm welding. Figure 1 , Figure 2 , Figure 8As shown, the length L3 of the matching groove 310 is 200±10mm. The matching groove 310 is used to fix the blade shaft 12. The length of the matching groove 310 is determined according to the blade shaft 12. The positioning plates 3 are arranged on two layers of the outer surface of the blade assembly 1, that is, two positioning devices 30 are formed, which are arranged upper and lower. When the height of the whole device is 3.6m, the two positioning devices 30 are respectively arranged at the elevations L1 (1.2m) and L2 (2.4m) from bottom to top. L1 and L2 are respectively at 1 / 3 and 2 / 3 of the height of the whole device, which can prevent the blade 16 from damaging the surrounding equipment due to wear and breakage to the greatest extent; each positioning plate 3 is welded to fix 4 blade assemblies 1, 15 positioning plates 3 per layer, and 30 positioning plates 3 in total for two layers. The angle of the blade 16 is determined by the auxiliary plate 4 before the positioning plate 3 is welded. Under the premise of using an auxiliary plate 4, the angle of the blade 16 is fixed. The blades 16 with different angles will have a great change on the specific surface area of ​​the finished micro powder. Therefore, according to the requirements of the specific surface area of ​​different finished micro powders, the angle of the blade 16 is determined by different auxiliary plates 4. The upper and lower positioning plates 3 are staggered and welded to improve the stability of the blade assembly 1. The radius R1 of the outer ring composed of the positioning device is 3150mm, and the radius R2 of the inner ring is 3100mm.

[0053] The positioning plate 3 is made of NM500 high-strength wear-resistant steel plate and has high wear resistance.

[0054] The existing micro powder classifier is overhauled to replace the stator blades (i.e. the blade assembly 1 of the present invention) and install the stator blade positioning device of the classifier. Two layers of positioning plates 3 are added from bottom to top with a spacing of 1200mm on the stator blades with a height of 3750mm. The blades are welded and the blades 16 angles are adjusted before welding. The material is NM500, and every 4 pieces are connected, and the upper and lower welding are staggered. The no-load vibration value of the equipment test run is 0.5MM / S, and the early operation is 2.1MM / S. The vibration is greatly reduced, the operating speed is 100r / min, and the specific surface area of ​​the obtained product is 420m 2 / kg~430m 2 / kg, which is consistent with the national standard GB / T18046-2017 of 350m 2 / kg~400m 2 / kg, the product quality is greatly improved. In the prior art, the rotation speed must be 110r / min, that is, the present invention meets the quality requirements of the finished micro powder under the condition of reducing the rotation speed, and saves energy consumption.

[0055] The powder classifier stator positioning device provided by the present invention only needs to be installed on the basis of the original powder classifier equipment structure. It has a simple structure, low manufacturing cost, and is easy to install, thereby reducing the equipment failure rate, increasing the service life of the stator blades, and improving product quality.

[0056] The beneficial effects of the present invention are as follows: the phenomenon of blade shaft 12 breakage is eliminated, the vibration of the equipment during operation is reduced, the operating stability of the equipment is improved, the operating current is reduced, energy saving and consumption reduction are achieved, and it helps to extend the service life of the equipment.

[0057] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0059] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A powder classifier stator positioning device, characterized in that: include: A positioning device, wherein the cross section of the positioning device is annular, the inner surface of the positioning device is connected to the outer surface of the stator and positions the stator; The positioning device is formed by connecting a plurality of positioning plates end to end in sequence, and the cross section of the positioning plates is a fan ring; The stator includes a plurality of blade assemblies, and the blade assemblies specifically include a blade shaft, a blade connecting plate, and a blade, and the blade shaft is connected to the blade through the blade connecting plate; The inner side surface of the positioning plate is provided with a matching groove which matches with the blade assembly; Wherein, the axis of the blade shaft is perpendicular to the upper surface of the positioning plate, and the blade shaft extends into the matching groove and is fixedly connected by welding; A plurality of matching grooves are provided on the inner side surface of each positioning plate, and the matching grooves are composed of a first plane, an arc surface, and a second plane connected in sequence, and the centers of each arc surface at the same horizontal position are connected to form a first circle, and the distances between the centers of any two adjacent arc surfaces are equal, and the first circle, the inner surface of the positioning device, and the outer surface of the positioning device at the same horizontal position share a common center; Two ends of the arc surface are tangent to the first plane and the second plane respectively, and the second plane forms a first preset angle with the first plane; In any connected blade assembly and matching groove, a second preset angle is formed between the blade and the first plane; An auxiliary plate, used to assist in adjusting the angle between the blade and the first plane when the positioning plate is welded to the blade assembly; by placing the auxiliary plate between the two blades and then adjusting the angle between the two blades, when the two blades are attached to the side of the auxiliary plate, the distance and angle between the two blades meet the process requirements; At least two groups of the positioning devices are arranged at intervals along the length direction of the blade assembly; The positioning plates in two adjacent positioning devices are staggered along the length direction of the blade assembly.

2. The powder classifier stator positioning device according to claim 1, characterized in that: The first end of the positioning plate is provided with a protrusion, and the second end of the positioning plate is provided with a recess. Among any two adjacent positioning plates, the protrusion of one positioning plate extends into the recess of the other positioning plate and is fixedly connected by welding.

3. The powder classifier stator positioning device according to claim 1, characterized in that: The blade connecting plate is detachably connected to the blade; The thickness of the positioning plate ranges from 10 mm to 12 mm.

4. The stator positioning device of the powder selector according to claim 1, characterized in that: The number of the blade assemblies is 60; Each of the positioning devices comprises 15 positioning plates, and each of the positioning plates is provided with four matching grooves; Wherein, each of the positioning plates is welded to the four blade assemblies, and the matching groove fits with the outer surface of the blade shaft.

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