Sand mixer for forging and casting wind wheel

Abstract

The utility model relates to the field of forging and casting technology, and concretely relates to a sand mixer for forging and casting wind wheels. It comprises a mixing box, the bottom of which is fixedly connected with a support, a rotating device is arranged between the inside of the mixing box and the support, the end of the rotating device is fixedly connected with a support plate, and the support plate is located in the inside of the mixing box. Elastic components are arranged on the outer walls of both sides of the support plate, a rolling component is arranged between the outer walls of the elastic components and the inside of the mixing box, sliding components are arranged at the other two ends of the support plate, and the bottom of each sliding component is fixedly connected with a scraper. The elastic components and the rolling component on both sides of the support plate are linked, the elastic deformation of the elastic components is utilized, the rolling component can automatically adjust the rolling strength according to the thickness and resistance of the sand layer, the self-adaptive adjustment of the rolling strength during the sand mixing process is realized, and the uniformity of the sand mixing is improved.

Description

Technical Field

[0001] This utility model relates to the field of forging and casting technology, and more specifically, to a sand mixer for forging and casting wind turbines. Background Technology

[0002] Sand mixers are key equipment in casting production used to mix raw sand, binders, additives, etc. in a certain proportion to prepare molding sand or core sand that meets process requirements. They use methods such as rolling and kneading, blade stirring, or the counter-current movement of different components to make the materials uniformly mixed and coat the sand particles with a binder film to meet the needs of casting molding and core making. Common types include rolling type, blade type, and counter-current type, which can be selected according to the production scale and molding sand performance requirements.

[0003] Compared to other forged castings, wind turbine forging requires higher molding sand uniformity, more precise control of the curing rhythm, and stronger resistance to molten metal erosion. Existing sand mixers for wind turbine forging typically employ a fixed compaction strength, making it inconvenient to dynamically adjust the compaction pressure based on the actual state of the sand layer. If the amount of molding sand added to the sand mixer exceeds the conventional level, or if the molding sand accumulates during mixing due to agglomeration or uneven moisture content, the actual thickness of the sand layer under the roller exceeds the design value. Alternatively, if the molding sand moisture content is too high, increasing the viscosity between sand particles and raising the friction during compaction, the resin sand curing reaction may start prematurely, causing some sand particles to agglomerate and further increasing the rolling resistance of the roller. Existing sand mixers cannot easily increase the compaction strength, leading to uneven sand mixing and insufficient binder coating. Ultimately, this results in quality defects in the wind turbine casting, such as hot cracks, porosity, and dimensional deviations.

[0004] Therefore, we propose a sand mixer for forging and casting wind turbines. Summary of the Invention

[0005] This utility model provides a sand mixer for forged and cast wind turbines. By installing elastic components with torque springs and rolling components on both sides of the support plate, the rolling wheel can automatically adjust its rolling intensity according to the sand layer thickness and resistance. Simultaneously, a sliding component with a tension spring is used to dynamically adapt the arc-shaped toothed scraper to the sand flow state, and a conical protrusion at the center of the mixing box optimizes the sand flow path, thereby solving the problems mentioned in the background art, namely: Existing sand mixers, due to their fixed compaction strength, cannot adapt to the dynamic changes in the sand layer, resulting in uneven sand mixing and insufficient binder coating, which in turn leads to quality defects in wind turbine castings such as hot cracks, porosity, and dimensional deviations.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A sand mixer for forging and casting wind turbines includes a mixing box, a support fixedly connected to the bottom of the mixing box, a rotating device provided between the mixing box and the support, and a support plate fixedly connected to the end of the rotating rod of the rotating device, the support plate being located inside the mixing box. The support plate has elastic components on both outer walls, and a rolling component is provided between the outer wall of the elastic component and the inside of the mixing box. The other two ends of the support plate have sliding components, and a scraper is fixedly connected to the bottom of the sliding component.

[0007] In the above technical solution, the elastic component includes a support rod, which is fixedly connected to the outer wall of the support plate. A rolling assembly is provided on the outer wall of the support rod, and a torque spring is provided between the support rod and the inside of the rolling assembly. A protruding rod is provided inside the torque spring.

[0008] Preferably, the rolling assembly includes a sleeve plate, one end of which is sleeved on the outer wall of the support rod, a torque spring is fixedly connected between the sleeve plate and the inside of the support rod, the protruding rod communicates inside the sleeve plate, and a shaft is movably connected to the other end of the sleeve plate, with a rolling wheel fixedly connected to the end of the shaft.

[0009] Preferably, the surface of the grinding wheel is provided with multiple protrusions to form a frosted surface.

[0010] Preferably, the mixing chamber is provided with a conical protrusion inside, the protrusion being located at the center and used to guide the mixed sand outward.

[0011] Based on this, the sliding assembly includes a slide rod, which is slidably connected inside the support plate. A tension spring is provided between the end of the slide rod and the inside of the support plate. A vertical rod is fixedly connected to the other end of the slide rod, and a scraper is fixedly connected to the bottom of the vertical rod.

[0012] Preferably, the scraper is arc-shaped, and the bottom of the scraper is provided with multiple toothed protrusions.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. In a sand mixer for forging and casting wind turbines, the elastic components on both sides of the support plate are linked with the rolling components. By utilizing the elastic deformation of the torque spring, the rolling wheel can automatically adjust the rolling pressure according to the sand layer thickness and resistance. When the sand layer state changes, the torque spring drives the sleeve plate to swing around the convex rod, driving the rolling wheel to dynamically adjust the rolling intensity on the sand material, thereby realizing the adaptive adjustment of the rolling pressure during the sand mixing process and improving the uniformity of molding sand mixing.

[0014] 2. In a sand mixer for forging and casting wind turbines, through the linkage design of the sliding components at both ends of the support plate and the arc-shaped scraper, when the rotating device drives the support plate to rotate, the centrifugal force drives the slide rod to slide outward along the support plate and stretch the spring, so that the scraper is in close contact with the inner wall of the mixing box under the interaction of centrifugal force and spring tension. At the same time, the toothed protrusions at the bottom of the scraper generate scraping force on the sand material attached to the inner wall of the mixing box during rotation, breaking up the agglomerates and pushing the edge sand material to the crushing area, thereby realizing dynamic sorting of the sand flow state and improving the mixing efficiency.

[0015] 3. In a sand mixer for forging and casting wind turbines, the conical protrusion at the center of the mixing box guides the sand to the surrounding area. Combined with the abrasive protrusions on the surface of the grinding wheel, the grinding effect is increased, the flow path of the sand in the mixing box is optimized, the sand accumulation is avoided, the coating effect of sand particles and binder is strengthened, and the performance stability of molding sand is improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the sliding component structure of this utility model; Figure 4 This is a side view of the sand-mixing rotating structure of this utility model; Figure 5 This is a schematic diagram of the compaction component structure of this utility model; Figure 6 This is a schematic diagram of the elastic component structure of this utility model; Figure 7 This is a side view of the elastic torsion structure of this utility model.

[0017] The components represented by each number in the attached diagram are listed below: 1. Mixing box; 11. Support; 12. Rotating device; 13. Support plate; 14. Elastic component; 140. Support rod; 141. Protruding rod; 142. Torque spring; 15. Compacting component; 150. Sleeve plate; 151. Shaft; 152. Roller; 16. Sliding component; 160. Vertical pole; 161. Slide rod; 162. Tension spring; 17. Scraper. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0019] Currently, existing sand mixers, due to their fixed compaction strength, cannot adapt to dynamic changes in the sand layer, resulting in uneven sand mixing and insufficient binder coating. This, in turn, leads to quality defects in the wind turbine castings such as hot cracks, porosity, and dimensional deviations. Please refer to [link to relevant documentation]. Figures 1-7 A sand mixer for forging and casting wind turbine is shown, including a mixing box 1, a support 11 fixedly connected to the bottom of the mixing box 1, a rotating device 12 provided between the mixing box 1 and the support 11, and a support plate 13 fixedly connected to the end of the rotating rod of the rotating device 12, the support plate 13 being located inside the mixing box 1. The support plate 13 has elastic components 14 on both outer walls. A rolling component 15 is provided between the outer wall of the elastic component 14 and the inside of the mixing box 1. The other two ends of the support plate 13 have sliding components 16. A scraper 17 is fixedly connected to the bottom of the sliding component 16.

[0020] When implementing, refer to Figures 5-7 As shown, the elastic component 14 includes a support rod 140, which is fixedly connected to the outer wall of the support plate 13. A rolling component 15 is provided on the outer wall of the support rod 140. A torque spring 142 is provided between the support rod 140 and the inside of the rolling component 15. A protruding rod 141 is provided inside the torque spring 142.

[0021] The rolling assembly 15 includes a sleeve plate 150, one end of which is sleeved on the outer wall of the support rod 140. A torque spring 142 is fixedly connected between the sleeve plate 150 and the inside of the support rod 140. A protruding rod 141 is connected inside the sleeve plate 150. A shaft 151 is movably connected to the other end of the sleeve plate 150. A rolling wheel 152 is fixedly connected to the end of the shaft 151.

[0022] When the rotating device 12 drives the support plate 13 to rotate in the mixing box 1, the elastic component 14 and the rolling component 15 form a dynamic response system; at this time, the support rod 140 fixed to the outer wall of the support plate 13 rotates synchronously with the support plate 13, and the sleeve plate 150 is sleeved on the outer wall of the support rod 140 through the torque spring 142. One end of the sleeve plate can swing around the protruding rod 141, and the other end is movably connected to the rolling wheel 152 through the shaft 151. When uneven thickness or agglomeration occurs in the sand layer during the sand mixing process, the roller 152 receives a reaction force after contacting the sand layer. This force pushes the sleeve 150 to swing upward around the convex rod 141, causing the torque spring 142 between the sleeve 150 and the support rod 140 to be compressed, resulting in corresponding elastic deformation. The elastic restoring force of the torque spring 142 is transmitted to the roller 152 through the sleeve 150, which is converted into the rolling pressure on the sand layer. That is, the greater the resistance of the sand layer, the greater the swing angle of the sleeve 150, the greater the compression of the torque spring 142, and the rolling intensity applied by the roller 152 will automatically increase, thereby effectively breaking up agglomerates or compacting thick sand layers. Conversely, when the resistance of the sand layer decreases, the elastic potential energy of the torque spring 142 is released, pushing the sleeve 150 to reset, causing the roller 152 to return to its initial swing angle, and the rolling intensity will drop accordingly. During this process, the convex rod 141 serves as a fixed fulcrum for the swing of the sleeve plate 150, ensuring that the roller 152 maintains a stable motion trajectory during swing. The elastic buffering characteristics of the torque spring 142 enable the roller 152 to respond to changes in the sand layer state in real time, achieving adaptive adjustment of the compaction intensity in the dynamic balance between centrifugal force and spring force, thus avoiding the problem of uneven sand mixing caused by the inability of traditional fixed compaction structures to adapt to sand layer fluctuations.

[0023] The grinding wheel 152 has multiple protrusions on its surface, forming a frosted surface. During the sand mixing process, it can significantly enhance the grinding and shearing effect on the sand particles. When the grinding wheel 152 rotates with the support plate 13 to crush the sand layer, the multi-point contact between the protrusions and the sand particles will generate irregular friction, causing the sand particles to roll and collide with each other, accelerating the uniform coating of the binder on the surface of the sand particles. At the same time, the uneven texture formed by the protrusions can effectively break up sand clumps and agglomerates, avoiding the problem of uneven curing of resin sand caused by local aggregation, thereby improving the air permeability and strength consistency of the molding sand.

[0024] See Figure 4 As shown, the mixing box 1 has a conical protrusion inside, and the protrusion is located in the center of the mixing box 1 to guide the sand to flow outward.

[0025] When the rotating device 12 drives the support plate 13 to rotate, the sand material converges towards the center of the mixing box 1 under the action of centrifugal force. The inclined surface of the conical protrusion guides the sand material accumulated in the center to the radial direction, avoiding the formation of a flow dead zone in the axial region. This structure allows the sand particles to enter the crushing area of ​​the roller 152 evenly. With the dynamic crushing action of the roller 152, the mixing blind zone caused by the accumulation of sand in the center of the traditional sand mixer can be eliminated. At the same time, the shear force generated when the sand particles slide down the conical surface during the guiding process can initially disperse the agglomerated sand material, reduce the crushing load of the roller 152, and thus improve the sand mixing efficiency and the uniformity of sand particle coating, ensuring the stability of various performance indicators of molding sand for wind turbine forging and casting.

[0026] Additionally, see Figure 3 and Figure 4 As shown, the sliding assembly 16 includes a slide rod 161, which is slidably connected inside the support plate 13. A tension spring 162 is provided between the end of the slide rod 161 and the inside of the support plate 13. The other end of the slide rod 161 is fixedly connected to a vertical rod 160, and a scraper 17 is fixedly connected to the bottom of the vertical rod 160.

[0027] When the rotating device 12 drives the support plate 13 to rotate, the sliding assembly 16 forms a dynamic adjustment system through centrifugal force and the elastic force of the tension spring 162; the slide rod 161 can slide radially in the sliding groove inside the support plate 13, one end of which is connected to the inner wall of the support plate 13 through the tension spring 162, and the other end is fixedly connected to the upright rod 160 and the scraper 17; during the rotation, the centrifugal force drives the slide rod 161 to slide outward and stretch the spring 162, so that the scraper 17 moves towards the inner wall of the mixing tank 1 under the action of centrifugal force, and at the same time, the restoring force of the tension spring 162 forms a reverse tension force. When the two are balanced, the scraper 17 is in close contact with the inner wall of the mixing tank 1. When sand accumulates or clumps at the edge of mixing chamber 1, the resistance on scraper 17 increases, and slide bar 161 slides further outward against the spring tension, increasing the cutting depth of scraper 17 into the sand layer. When the resistance decreases, tension spring 162 contracts, causing slide bar 161 to reset, and scraper 17 returns to its initial position. During this process, the elastic buffer of tension spring 162 allows scraper 17 to automatically adjust its force according to the sand flow resistance, achieving continuous cleaning and guiding of sand on the inner wall of mixing chamber 1 in the dynamic balance between centrifugal force and spring force. This avoids the problem of edge sand accumulation caused by the inability of traditional fixed scraper 17 to adapt to sand layer fluctuations, thus improving sand mixing efficiency and uniformity.

[0028] Among them, see Figure 3 As shown, the scraper 17 is arc-shaped, with multiple toothed protrusions at its bottom. By conforming its arc-shaped profile to the curve of the mixing chamber 1's inner wall, the scraper 17 maintains a consistent distance from the wall during rotation, avoiding uneven edge gaps caused by a straight scraper 17. This ensures thorough cleaning of the sand adhering to the inner wall of the mixing chamber 1. The toothed protrusions at the bottom generate shearing and crushing force during rotation, effectively tearing apart clumps of sand. Simultaneously, the gaps between the teeth release adhering resin sand, preventing scale buildup on the scraper 17's surface. This combination allows the scraper 17 to push edge sand towards the compaction area via its arc-shaped surface while simultaneously utilizing the cutting effect of the toothed protrusions to enhance sand dispersion. This solves the problem of incomplete cleaning of clumps of sand by traditional scrapers 17, improving material flowability and mixing uniformity in the sand-mixing edge area.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sand mixer for forging and casting wind turbines, comprising a mixing chamber (1), wherein a support (11) is fixedly connected to the bottom of the mixing chamber (1), and a rotating device (12) is provided between the mixing chamber (1) and the support (11), characterized in that: The rotating device (12) has a support plate (13) fixedly connected to the end of the rotating rod, and the support plate (13) is located inside the mixing box (1); The support plate (13) has elastic components (14) on both outer walls. A rolling component (15) is provided between the outer wall of the elastic component (14) and the inside of the mixing box (1). The support plate (13) has sliding components (16) at both other ends. A scraper (17) is fixedly connected to the bottom of the sliding component (16).

2. The sand mixer for forged and cast wind turbines according to claim 1, characterized in that: The elastic component (14) includes a support rod (140), which is fixedly connected to the outer wall of the support plate (13). The outer wall of the support rod (140) is provided with a rolling component (15). A torque spring (142) is provided between the support rod (140) and the rolling component (15). A protruding rod (141) is provided inside the torque spring (142).

3. The sand mixer for forged and cast wind turbines according to claim 2, characterized in that: The rolling assembly (15) includes a sleeve (150), one end of which is sleeved on the outer wall of the support rod (140). A torque spring (142) is fixedly connected between the sleeve (150) and the inside of the support rod (140). A protruding rod (141) is connected inside the sleeve (150). A shaft (151) is movably connected to the other end of the sleeve (150). A rolling wheel (152) is fixedly connected to the end of the shaft (151).

4. The sand mixer for forged and cast wind turbines according to claim 3, characterized in that: The surface of the grinding wheel (152) is provided with multiple protrusions to form a frosted surface.

5. The sand mixer for forged and cast wind turbines according to claim 1, characterized in that: The mixing box (1) is provided with a conical protrusion inside. The protrusion of the mixing box (1) is located in the center position and is used to guide the mixed sand outward.

6. The sand mixer for forged and cast wind turbines according to claim 1, characterized in that: The sliding assembly (16) includes a slide rod (161), which is slidably connected inside the support plate (13). A tension spring (162) is provided between the end of the slide rod (161) and the inside of the support plate (13). A vertical rod (160) is fixedly connected to the other end of the slide rod (161), and a scraper (17) is fixedly connected to the bottom of the vertical rod (160).

7. The sand mixer for forged and cast wind turbines according to claim 6, characterized in that: The scraper (17) is arc-shaped, and the bottom of the scraper (17) is provided with multiple tooth-shaped protrusions.

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