A star valve structure for powder conveying and a powder conveying system

Abstract

The utility model relates to powder conveying equipment technical field, more particularly to a kind of star valve structure and powder conveying system for powder conveying.A kind of star valve structure for powder conveying, including valve body and the rotor being set in valve body inside;Rotor includes center shaft and star blade being set on center shaft;The material of star blade is polyurethane material;The shore A hardness of star blade is 80~95.The star valve structure for powder conveying has the advantages, including: foreign matter risk is low: no metal foreign matter is generated, reduces hard particle accumulation;Wear resistance is strong: service life is significantly improved;Maintenance cost is low: can be used without spraying wear-resistant coating, maintenance frequency is reduced, single maintenance cost is reduced;Good anti-vibration performance: can adapt to vibration environment, stable operation;Installation and maintenance are simple: overall structure is simple, easy to disassemble and assemble, support quick replacement.

Description

Technical Field

[0001] This utility model belongs to the technical field of powder conveying equipment, specifically, it relates to a star valve structure and a powder conveying system for powder conveying. Background Technology

[0002] In powder conveying systems of industries such as chemical, metallurgy, and building materials, rotary valves are a key piece of equipment. Currently, metal rotary valve cores are widely used for powder conveying in workshops. However, the following problems exist in the use of metal rotary valves: 1) Metal valve cores are prone to wear due to vibration and valve body, producing metal foreign objects (such as iron Fe) that contaminate materials.

[0003] 2) Hard particles such as ceramic blocks and crucible residue can easily accumulate in the gap between the valve core and the valve body, which aggravates wear and affects sealing performance and service life.

[0004] 3) Metal valve cores need to be regularly coated with wear-resistant coatings such as tungsten carbide, resulting in high maintenance frequency and high costs.

[0005] 4) Under vibration, the valve core is prone to displacement, which leads to unstable operation and affects product quality and equipment life.

[0006] Therefore, there is an urgent need for a star-shaped valve core structure that is wear-resistant, vibration-resistant, and has a low risk of foreign objects.

[0007] In view of the above, this utility model is hereby proposed. Utility Model Content

[0008] One objective of this invention is to provide a star valve structure for powder conveying, which can prevent the metal valve core from generating metal foreign matter that contaminates the material due to vibration and wear, while also having high wear resistance and service life, and improving the operational stability of the valve core in a vibration environment.

[0009] Another objective of this invention is to provide a powder conveying system.

[0010] In order to achieve the above-mentioned objectives of this utility model, the following technical solution is adopted: A star valve structure for powder conveying includes a valve body and a rotor disposed inside the valve body; the rotor includes a central shaft and star-shaped blades sleeved on the central shaft; the star-shaped blades are made of polyurethane material; the Shore A hardness of the star-shaped blades is 80~95. In some embodiments, the Shore A hardness of the star-shaped blade is 85-92.

[0011] In some embodiments, the polyurethane material is thermoplastic polyurethane.

[0012] In some embodiments, the star-shaped blade includes a blade base and a plurality of tip blades disposed on the outer surface of the blade base. The blade base has a hollow structure, and the central axis of rotation passes through the hollow structure. The tip blades extend radially toward the central axis of rotation and are uniformly distributed circumferentially.

[0013] In some embodiments, the number of tip blades is 4 to 10.

[0014] In some embodiments, the outer diameter of the blade base is d1, the outer diameter of the star-shaped blade is d2, and 25 ≤ d2 - d1 ≤ 35 mm.

[0015] In some embodiments, the tip surface of the tip blade has a width of d3, the tip surface of the tip blade has a first rounded corner with a radius of R1, the connection between the tip blade and the blade base has a second rounded corner with a radius of R2, and the ratio of d3, R1 and R2 is (8~12):(0.8~1.2):(7~9).

[0016] In some embodiments, the outer diameter of the star-shaped blade is d2, the length of the star-shaped blade is L, and the ratio of L to d2 is (220~240):(190~200).

[0017] In some embodiments, the shortest distance D between the tip of the star-shaped blade and the inner wall of the valve body satisfies: 0.5≤D≤2mm.

[0018] In some embodiments, the surface of the star-shaped blade is further provided with a wear-resistant coating.

[0019] In some embodiments, the wear-resistant coating is a tungsten carbide coating.

[0020] In some embodiments, the thickness of the wear-resistant coating is 0.2~0.3 mm.

[0021] In some embodiments, the star-shaped blade has an integrally molded structure.

[0022] In some embodiments, the star-shaped blade has a detachable blade structure.

[0023] A powder conveying system includes the aforementioned star valve structure.

[0024] In some embodiments, the powder conveying system includes at least one of a feeding unit, a receiving unit, a crushing unit, and a screening unit; the star valve structure is disposed in at least one of the feeding unit, the receiving unit, the crushing unit, and the screening unit.

[0025] In some embodiments, the powder conveying system is further provided with a valve core wear monitoring device for monitoring the wear condition of the star valve structure.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The star valve structure for powder conveying provided by this utility model is made of polyurethane elastomer material with Shore A hardness within the above range, which can ensure the balance of rigidity and elasticity and guarantee good wear resistance and elasticity; the advantages of the star valve structure for powder conveying include: low risk of foreign matter: the elastomer material with suitable hardness does not produce metal foreign matter, reducing the accumulation of hard particles; strong wear resistance: the elastomer material has excellent wear resistance, and the service life is significantly improved; low maintenance cost: it can be used without spraying wear-resistant coating, reducing the maintenance frequency and significantly reducing the cost of a single maintenance; good vibration resistance: the material of the star blade has good elasticity, can adapt to the vibration environment, and operate stably; simple installation and maintenance: the overall structure is simple, easy to disassemble and assemble, and supports quick replacement.

[0027] (2) A star valve structure for powder conveying is set in the powder conveying system. The star valve structure for powder conveying can solve the problem of metal foreign matter contaminating the powder due to vibration wear of the metal valve core, improve the wear resistance and service life of the valve core, reduce the maintenance frequency and cost, and improve the operating stability of the valve core in the vibration environment, thereby ensuring the reliability and efficiency of the powder conveying system. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a side view of the star-shaped blade of this utility model; Figure 2 This is a front view of the rotor of this utility model.

[0030] Figure label: 1-Star-shaped blade, 101-Blade base, 102-Tip blade, 1021-First fillet, 1022-Second fillet, 2-Central shaft. Detailed Implementation

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In one aspect, this utility model relates to a star valve structure for conveying powder, including a valve body and a rotor disposed inside the valve body; the rotor includes a central rotating shaft and star-shaped blades sleeved on the central rotating shaft; the star-shaped blades are made of polyurethane material; the Shore A hardness of the star-shaped blades is 80~95. This utility model provides a star-shaped valve structure for powder conveying. The star-shaped blades are made of polyurethane elastomer material with a Shore A hardness within the aforementioned range, ensuring a balance between rigidity and elasticity, and guaranteeing good wear resistance and elasticity. The advantages of the above-mentioned star-shaped valve structure for powder conveying include: low risk of foreign objects: the elastomer material with suitable hardness does not generate metallic foreign objects, reducing the accumulation of hard particles; strong wear resistance: the elastomer material has excellent wear resistance, significantly extending service life; low maintenance cost: it can be used without spraying a wear-resistant coating, reducing maintenance frequency and reducing the cost per maintenance by at least 840 yuan; good vibration resistance: the material of the star-shaped blades has good elasticity, can adapt to vibration environments, and operates stably; simple installation and maintenance: the overall structure is simple, easy to disassemble and assemble, and supports quick replacement.

[0034] In some embodiments, the Shore A hardness of the star-shaped blade is 85, 86, 88, 90, 91, 92, 93, 95, or any value between two values. In some embodiments, the Shore A hardness of the star-shaped blade is 85~92. If the Shore A hardness is too low, it is not conducive to withstanding the pressure of the powder and the shear force of the blade, easily leading to deformation, blockage, and reduced conveying efficiency; if the Shore A hardness is too high, the elasticity is too poor, easily causing brittleness. Therefore, the elastomer material in this invention has a suitable Shore A hardness to better balance wear resistance and elasticity.

[0035] In some embodiments, the polyurethane material is thermoplastic polyurethane (TPU).

[0036] In some embodiments, the star-shaped blade includes a blade base and a plurality of tip blades disposed on the outer surface of the blade base. The blade base has a hollow structure, and the central axis of rotation passes through the hollow structure. The tip blades extend radially toward the central axis of rotation and are uniformly distributed circumferentially to form a star-shaped radial structure.

[0037] In some embodiments, the number of tip blades is 4 to 10, such as 6, 8, or 10. The number of tip blades can be adapted to different powder processing methods.

[0038] In some embodiments, the outer diameter of the blade base is d1, and the outer diameter of the star-shaped blade is d2, where 25mm ≤ d2 - d1 ≤ 35mm, for example, 25mm, 28mm, 30mm, 32mm, 35mm, etc. A suitable d2-d1 range, meaning the height of the tip blade is appropriate, is suitable for conveying different powders and helps ensure the powder conveying effect.

[0039] In some embodiments, the tip surface of the tip blade has a width of d3, a first fillet with a radius of R1, and a second fillet with a radius of R2 at the junction of the tip blade and the blade base. The ratio of d3, R1, and R2 is (8~12):(0.8~1.2):(7~9), for example, 8:0.8:7, 10:1:8, 12:1.2:9, etc. A suitable ratio of d3, R1, and R2 is beneficial for ensuring the structural stability of the tip blade.

[0040] In some embodiments, the outer diameter of the star-shaped blade is d2, the length of the star-shaped blade is L, and the ratio of L to d2 is (220~240):(190~200), for example 220:190, 230:195, 240:200, etc. The suitable ratio of L to d2 in this invention is beneficial to ensuring the overall mechanical properties of the star-shaped blade.

[0041] In some implementations, the length of the central rotating shaft is 550~600mm, such as 550mm, 560mm, 570mm, 580mm, 600mm, etc. The length of the central rotating shaft can be adaptively adjusted according to the needs of powder conveying to ensure stable operation of powder conveying.

[0042] In some embodiments, the shortest distance D between the tip of the star-shaped blade and the inner wall of the valve body satisfies: 0.5 ≤ D ≤ 2 mm, that is, the gap between the tip of the star-shaped blade and the inner wall of the valve body is 0.5~2 mm, for example, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, or 2 mm. In some embodiments, 0.8 ≤ D ≤ 1.2 mm. By setting the shortest distance D between the tip of the star-shaped blade and the inner wall of the valve body to satisfy the above range, the accumulation of hard particles is reduced, material jamming is avoided, and good sealing performance is maintained at the same time.

[0043] In some embodiments, the surface of the star-shaped blade is further provided with a wear-resistant coating. Providing a wear-resistant coating on the surface of the star-shaped blade further enhances wear resistance. In some embodiments, the wear-resistant coating is a tungsten carbide coating. The thickness of the wear-resistant coating is 0.2~0.3 mm, for example, 0.2 mm, 0.23 mm, 0.25 mm, or 0.3 mm.

[0044] In some embodiments, the star-shaped blade has a one-piece molded structure. By providing a one-piece molded structure, stress concentration is avoided, thereby ensuring the overall structural stability of the star-shaped blade.

[0045] In some embodiments, the star-shaped blades have a detachable blade structure. By providing a detachable blade structure, partial replacement is facilitated, which helps reduce maintenance costs.

[0046] In another aspect, this utility model relates to a powder conveying system, including the aforementioned star valve structure.

[0047] A star valve structure is installed in the powder conveying system. The star valve structure can solve the problem of metal foreign matter contaminating the powder due to vibration and wear of the metal valve core. It can improve the wear resistance and service life of the valve core, reduce the frequency and cost of maintenance, and improve the operational stability of the valve core in the vibration environment. In this way, the reliability and efficiency of the powder conveying system can be guaranteed.

[0048] In some embodiments, the powder conveying system includes at least one of a feeding unit, a receiving unit, a crushing unit, and a screening unit; the star valve structure is disposed in at least one of the feeding unit, the receiving unit, the crushing unit, and the screening unit.

[0049] In some implementations, a valve core wear monitoring device is also provided. This device monitors the wear condition of the valve core, enabling predictive maintenance.

[0050] The following explanation, combined with specific embodiments and comparative examples, further illustrates the point.

[0051] Example 1 A star valve structure for conveying powder includes a valve body and a rotor disposed inside the valve body; the rotor includes a central shaft 2 and star blades 1 sleeved on the central shaft 2.

[0052] like Figure 1 and Figure 2 As shown, the star-shaped blade 1 includes a blade base 101 and a plurality of tip blades 102 disposed on the outer surface of the blade base 101. The blade base 101 has a hollow structure, through which a central rotating shaft 2 passes. The tip blades 102 extend radially toward the central rotating shaft 2 and are evenly distributed circumferentially, with a total of 8 tip blades 102. The outer diameter of the blade base 101 is d1 = 165 mm, the outer diameter of the star-shaped blade 1 is d2 = 196.5 mm, the width of the tip surface of the tip blade 102 is d3 = 10 mm, the tip surface of the tip blade 102 has a first fillet 1021 with a radius R1 = 1 mm, the connection between the tip blade 102 and the blade base 101 has a second fillet 1022 with a radius R2 = 8 mm, and the length of the star-shaped blade 1 is L = 227 mm. The total length of the central shaft 2 is L3=580mm, L2=416mm, L1=94.5mm, d4=40mm, and d5=35mm.

[0053] The star-shaped blade 1 is made of polyurethane and has a Shore A hardness of 90. The star-shaped blade 1 has a one-piece molded structure.

[0054] The shortest distance D between the tip of the star-shaped blade 1 and the inner wall of the valve body is 1mm.

[0055] A powder conveying system, wherein the star valve structure for powder conveying of this embodiment is installed at the raw material station (discharge unit) in the workshop.

[0056] Example 2 A star valve structure for powder conveying differs from that in Example 1 in that: The Shore A hardness of star-shaped blade 1 is 80. The shortest distance D between the tip of star-shaped blade 1 and the inner wall of the valve body is 0.5 mm.

[0057] A powder conveying system, wherein the star valve structure for powder conveying of this embodiment is installed at the raw material station (discharge unit) in the workshop.

[0058] Example 3 A star valve structure for powder conveying differs from that in Example 1 in that: The Shore A hardness of star-shaped vane 1 is 95. The shortest distance D between the tip of star-shaped vane 1 and the inner wall of the valve body is 2mm.

[0059] A powder conveying system, wherein the star valve structure for powder conveying of this embodiment is installed at the raw material station (discharge unit) in the workshop.

[0060] Example 4 A star valve structure for powder conveying differs from Embodiment 1 in that the star blade 1 has a Shore A hardness of 88. The star blade 1 has a detachable blade structure.

[0061] A powder conveying system, wherein the star valve structure for powder conveying of this embodiment is installed at the raw material station (discharge unit) in the workshop.

[0062] Example 5 A powder conveying system, which differs from Example 1 in that: Install the star valve structure for powder conveying of Example 1 in the crushing unit (crusher station).

[0063] Comparative Example 1 A powder conveying system, which differs from Example 1 in that: The blades are made of metal and coated with tungsten carbide.

[0064] A powder conveying system, wherein a star valve structure for powder conveying, as described in this comparative example, is installed at the raw material station (discharge unit) in the workshop.

[0065] Comparative Example 2 A powder conveying system, which differs from Example 1 in that: Nylon valve core is used.

[0066] A powder conveying system, wherein a star valve structure for powder conveying, as described in this comparative example, is installed at the raw material station (discharge unit) in the workshop.

[0067] Experimental Example The powder conveying systems in Examples 1-4 showed no wear or foreign matter in the star valve structure used for powder conveying after 6 months of operation, exhibited good vibration stability, and required no maintenance.

[0068] The powder conveying system of Example 5 extends the service life of the star valve structure used for powder conveying to more than 12 months and reduces the cost by more than 50%.

[0069] In Comparative Example 1, the powder conveying system showed significant wear on the blades after 3 months of operation, resulting in the generation of metallic foreign objects.

[0070] In Comparative Example 2, the powder conveying system had poor blade wear resistance and a service life of less than 4 months.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A star valve structure for conveying powder, characterized in that, It includes a valve body and a rotor disposed inside the valve body; the rotor includes a central shaft and star-shaped blades sleeved on the central shaft; the star-shaped blades are made of polyurethane material; the Shore A hardness of the star-shaped blades is 80~95.

2. The star valve structure for powder conveying according to claim 1, characterized in that, The Shore A hardness of the star-shaped blade is 85~92.

3. The star valve structure for powder conveying according to claim 1, characterized in that, The polyurethane material is thermoplastic polyurethane.

4. The star valve structure for powder conveying according to claim 1, characterized in that, The star-shaped blade includes a blade base and a plurality of tip blades disposed on the outer surface of the blade base. The blade base has a hollow structure, and the central axis of rotation passes through the hollow structure. The tip blades extend radially toward the central axis of rotation and are uniformly distributed circumferentially.

5. The star valve structure for powder conveying according to claim 4, characterized in that, It includes at least one of the following features (1) to (4): (1) The number of the tip blades is 4 to 10; (2) The outer diameter of the blade base is d1, and the outer diameter of the star-shaped blade is d2, 25 mm ≤ d2 - d1 ≤ 35 mm; (3) The width of the tip surface of the tip blade is d3, the tip surface of the tip blade has a first rounded corner with a radius of R1, the connection between the tip blade and the blade base has a second rounded corner with a radius of R2, and the ratio of d3, R1 and R2 is (8~12):(0.8~1.2):(7~9). (4) The outer diameter of the star-shaped blade is d2, the length of the star-shaped blade is L, and the ratio of L to d2 is (220~240):(190~200).

6. The star valve structure for powder conveying according to claim 1, characterized in that, The shortest distance D between the tip of the star-shaped blade and the inner wall of the valve body satisfies: 0.5≤D≤2mm.

7. The star valve structure for powder conveying according to claim 1, characterized in that, The surface of the star-shaped blades is also provided with a wear-resistant coating; The wear-resistant coating is a tungsten carbide coating; The thickness of the wear-resistant coating is 0.2~0.3mm.

8. The star valve structure for powder conveying according to claim 1, characterized in that, Includes the following features (1) or (2): (1) The star-shaped blade has an integrally formed structure; (2) The star-shaped blade has a detachable blade structure.

9. A powder conveying system, characterized in that, The star valve structure includes any one of claims 1 to 8.

10. The powder conveying system according to claim 9, characterized in that, It contains at least one of the following features (1) and (2): (1) The powder conveying system includes at least one of a feeding unit, a receiving unit, a crushing unit, and a screening unit; the star valve structure is provided in at least one of the feeding unit, the receiving unit, the crushing unit, and the screening unit; (2) The powder conveying system is also equipped with a valve core wear monitoring device to monitor the wear condition of the star valve structure.

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