A stir bar with a cylindrical pin

Abstract

The utility model is suitable for the technical field of stirring rod, provides a kind of stirring rod of cylindrical pin fixed, including stirring shaft, stirring head and cylindrical pin;Through the insertion hole being set on the stirring shaft, the stirring head is arranged in the insertion hole;Positioning slot is equipped on the stirring head;Through the pin hole being further set on the stirring shaft, the axis of pin hole and the axis of insertion hole are perpendicular intersection, and the pin hole is located in the tangent direction of insertion hole;The cylindrical pin is arranged in the pin hole, and the positioning slot of the stirring head is formed with the joint cooperation of carding.The cylindrical pin includes straight rod section at both ends and deformation section at middle part;The cylindrical pin and pin hole are initially gap fit, and plastic deformation is caused by exerting external force to deformation section during assembly, so that the cylindrical pin and pin hole form interference fit.The utility model solves the problem that the traditional stirring shaft and stirring head welding fixed lead to unstable operation of stirring shaft, cannot replace wear and tear stirring head alone.

Description

Technical Field

[0001] This invention relates to the field of stirring rod technology, and in particular to a stirring rod fixed by a cylindrical pin. Background Technology

[0002] Vertical stirred ball mills are widely used for grinding or dispersing micron-sized powder particles. Their stirring unit typically consists of a longitudinal stirring shaft and several transverse stirring heads. Traditionally, the stirring heads are fixed by drilling holes in the stirring shaft, inserting the stirring head, and then welding it in. However, this method has several significant drawbacks: First, the welding process can easily cause deformation of the stirring shaft, affecting its precision, and may also cause significant swaying during high-speed rotation, reducing the stability of the equipment and grinding efficiency. Second, because the stirring heads are fixed to the stirring shaft by welding, when a stirring head wears out and needs replacement, it is impossible to replace only that stirring head; the entire stirring shaft or all the stirring heads must be replaced, which undoubtedly increases the user's operating costs.

[0003] To solve the above-mentioned technical problems, this utility model designs a stirring rod fixed by a cylindrical pin. Utility Model Content

[0004] This invention provides a stirring rod fixed by a cylindrical pin, which aims to solve the problems of unstable operation of the stirring shaft and inability to replace worn stirring heads individually caused by welding and fixing the traditional stirring shaft and stirring head.

[0005] A stirring rod fixed by a cylindrical pin includes a stirring shaft, a stirring head, and a cylindrical pin. The stirring shaft has a through insertion hole, and the stirring head passes through the insertion hole. The stirring head has a positioning groove. The stirring shaft also has a through pin hole, the axis of which intersects perpendicularly with the axis of the insertion hole, and the pin hole is located tangentially to the insertion hole. The cylindrical pin passes through the pin hole and engages with the positioning groove of the stirring head.

[0006] Based on the above technical solution, the positioning groove is an annular groove surrounding the stirring head.

[0007] Based on the above technical solution, the diameter of the pin hole is smaller than the diameter of the insertion hole.

[0008] Based on the above technical solution, the cylindrical pin includes straight rod sections at both ends and a deformable section in the middle; the cylindrical pin and the pin hole are initially clearance fit, and during assembly, an external force is applied to the deformable section to cause plastic deformation, resulting in an interference fit between the cylindrical pin and the pin hole.

[0009] Beneficial effects

[0010] Compared with existing technologies, the beneficial effects of this utility model are as follows: 1. By using a cylindrical pin to fix the stirring head, the traditional welding method is replaced, avoiding the deformation problem of the stirring shaft caused by welding. This not only ensures the high precision of the stirring shaft and reduces the wobble phenomenon during high-speed rotation, but also improves the overall stability and grinding efficiency of the equipment. 2. By setting the pin hole in the tangential direction of the insertion hole and using a cylindrical pin with a deformable section to achieve an interference fit, the connection between the stirring head and the stirring shaft is strengthened. This design not only effectively prevents the stirring head from loosening or falling off during operation, but also optimizes the force distribution, increases fatigue resistance, and ensures the safety and reliability of long-term use. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0012] Figure 1 : A schematic diagram of the connection of the dual stirring heads of this utility model;

[0013] Figure 2 : A schematic diagram of the connection of the single stirring head of this utility model;

[0014] Figure 3 : Exploded view of the structure of this utility model;

[0015] Figure 4 : A cross-sectional view of the stirring shaft described in this utility model;

[0016] Figure 5 : A schematic diagram of the annular groove described in this utility model;

[0017] Figure 6 : A schematic diagram of the single-sided positioning groove of this utility model;

[0018] Figure 7 : A schematic diagram of the positioning recess described in this utility model;

[0019] Figure 8 : A schematic diagram of the structure of the cylindrical pin described in this utility model;

[0020] Figure 9 This utility model describes a structural diagram of a bending rod structure for its stirring head. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and examples:

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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.

[0025] like Figures 1 to 3 As shown, a stirring rod fixed by a cylindrical pin includes a stirring shaft 1, a stirring head 2, and a cylindrical pin 3. The stirring shaft 1 has a through insertion hole 11, and the stirring head 2 passes through the insertion hole 11. The stirring head 2 has a positioning groove 21. The stirring shaft 1 also has a through pin hole 12, the axis of which intersects perpendicularly with the axis of the insertion hole 11, and the pin hole 12 is located tangentially to the insertion hole 11. The cylindrical pin 3 passes through the pin hole 12 and engages with the positioning groove 21 of the stirring head 2. Because the pin hole 12 is not on the axis of the insertion hole 11 but is located tangentially, the cylindrical pin 3 can be more effectively fixed.

[0026] The diameter of the pin hole 12 is smaller than the diameter of the insertion hole 11. This smaller diameter ensures that the cylindrical pin is securely fixed within the pin hole and effectively engages with the positioning groove of the stirring head.

[0027] Since the stirring head 2 can be replaced simply by removing the cylindrical pin 3, unlike traditional welding methods which require replacing the entire stirring shaft or all stirring heads, worn stirring heads can be replaced individually. This not only simplifies the maintenance process but also significantly reduces the user's operating costs.

[0028] like Figure 1 and Figure 2 As shown, the stirring heads 2 can be arranged in different ways, such as in a straight line or in a cross shape.

[0029] like Figure 4 As shown, the positioning groove 21 is an annular groove surrounding the stirring head 2. The stirring head 2 can rotate along its axis. Traditional fixed stirring rods suffer from severe localized wear due to prolonged contact with material in the same position. When the stirring head 2 can rotate, the side in contact with the material is not always fixed to one part, but naturally changes position over time. This means that the wear in any given area will be much less than when it is stationary, as the wear is distributed across the entire surface. This rotation provides a self-regulating mechanism, allowing the stirring head to expose less worn areas to less wear-prone locations through natural rotation, thus reducing the risk of further damage. This not only helps maintain long-term stirring efficiency but also reduces the need for frequent stirring head replacements.

[0030] like Figure 5 As shown, in some embodiments, the positioning groove 21 is a single-sided positioning groove opened on one side of the stirring head 2, and the cylindrical pin 3 is a single one that cooperates with the single-sided positioning groove.

[0031] Compared to a circumferential annular groove design, a single-sided positioning groove design is simpler. This not only simplifies the manufacturing process but also reduces material costs and processing time. For certain applications, it may not be necessary to rotate the stirring head to even out wear, or the equipment design may have already considered wear distribution. In such cases, a single-sided positioning groove provides sufficient fixing force to ensure stable operation of the stirring head while reducing unnecessary design complexity.

[0032] like Figure 6 As shown, in some embodiments, the positioning groove 21 includes two positioning recesses spaced apart along the axial direction of the stirring head 2; the pin holes 12 are correspondingly set to two, each pin hole 12 having a cylindrical pin 3 inserted inside, and each cylindrical pin 3 engaging with the corresponding positioning recess.

[0033] By using two cylindrical pins 3 and corresponding positioning recesses for fixation, the connection between the stirring head and the stirring shaft can be significantly improved. Compared to a single cylindrical pin design, the double cylindrical pin structure can more effectively prevent the stirring head from loosening or shifting during operation, especially under high-load working conditions. For some applications requiring large torque transmission, the double cylindrical pin design provides better torsional resistance. It ensures that the stirring head remains stable under torsional forces, preventing it from easily detaching or being damaged, thus guaranteeing the continuity and efficiency of the stirring process.

[0034] like Figure 7 As shown, in some embodiments, the cylindrical pin 3 includes straight rod sections 31 at both ends and a deformable section 32 in the middle; the cylindrical pin 3 and the pin hole 12 are initially clearance fit, but during assembly, an external force is applied to the deformable section 32 to cause it to undergo plastic deformation, resulting in an interference fit between the cylindrical pin 3 and the pin hole 12.

[0035] By causing plastic deformation of the deformable section 32 of the cylindrical pin, a tight interference fit can be ensured between the cylindrical pin 3 and the pin hole 12, greatly enhancing the connection strength between the stirring head 2 and the stirring shaft 1. This design effectively prevents the stirring head from loosening or falling off under high-intensity operating conditions. This design is suitable for applications where the stirring head 2 does not need to rotate during operation.

[0036] After plastic deformation, the deformable segment 32 forms an S-shaped structure through multiple bends. The S-shaped structure provides a stronger mechanical locking effect. Due to its complex and non-linear shape, it can better resist pulling and rotational forces when subjected to external forces, ensuring a more secure connection between the stirring head and the stirring shaft and preventing loosening or detachment.

[0037] The stirring head 2 is a straight rod structure or a curved rod structure.

[0038] When the stirring head 2 is a straight rod structure, the straight rod structure is relatively simple and easy to manufacture. This can reduce production costs and ensure high product consistency during mass production. For applications subject to high stress, the straight rod structure generally provides better rigidity and strength, reducing the risk of deformation or breakage due to bending.

[0039] like Figure 8 As shown, when the stirring head 2 has a curved rod structure, the curved rod design can increase the degree of turbulence by changing the direction and speed of fluid flow, thereby improving the stirring effect. Especially when processing viscous materials or requiring strong shearing action, the curved rod can better achieve uniform distribution and refinement of materials. The curved part can generate stronger local shear force in specific areas, which helps to break up agglomerated particles or accelerate the dissolution process, making it particularly suitable for applications requiring efficient mixing, such as chemical reactions and coating manufacturing. After installing the stirring head 2 according to the orientation of the curved rod, the positioning groove 21 provided on the stirring head 2 can fix the orientation of the curved rod.

[0040] In use, the stirring head 2 is inserted into the insertion hole 11 of the stirring shaft 1. The positioning groove 21 on the stirring head should be aligned with the position of the pin hole 12 for subsequent fixation. Take a cylindrical pin 3, whose structure includes straight rod sections 31 at both ends and a deformable section 32 in the middle. Insert the cylindrical pin through the pin hole 12, making it engage with the positioning groove 21 on the stirring head 2. During assembly, by applying external force to the deformable section, it undergoes plastic deformation, transforming into an S-shaped structure formed by multiple bends, thereby achieving an interference fit and enhancing the fixing effect.

[0041] For designs that allow the mixing head to rotate (e.g., the positioning groove on the mixing head is a circumferential annular groove), the mixing head will naturally rotate due to the flow of slurry during long-term use, resulting in a more even distribution of wear on the surface of the mixing head and extending its service life.

[0042] It should be noted that the cylindrical pin, stirring head, stirring shaft, etc. in this embodiment are all general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0043] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A stir bar with a cylindrical pin fixation, characterized in that: The device includes a stirring shaft (1), a stirring head (2), and a cylindrical pin (3). The stirring shaft (1) has a through insertion hole (11), and the stirring head (2) is inserted into the insertion hole (11). The stirring head (2) has a positioning groove (21). The stirring shaft (1) also has a through pin hole (12), the axis of which intersects perpendicularly with the axis of the insertion hole (11), and the pin hole (12) is located in the tangential direction of the insertion hole (11). The cylindrical pin (3) is inserted into the pin hole (12) and forms a snap-fit ​​with the positioning groove (21) of the stirring head (2).

2. The stirring rod fixed by a cylindrical pin according to claim 1, characterized in that: The positioning groove (21) is an annular groove surrounding the stirring head (2).

3. The stirring rod fixed by a cylindrical pin according to claim 2, characterized in that: The positioning groove (21) is a single-sided positioning groove opened on one side of the stirring head (2), and the cylindrical pin (3) is a single one that cooperates with the single-sided positioning groove.

4. The stirring rod fixed by a cylindrical pin according to claim 1, characterized in that... The positioning groove (21) includes two positioning recesses spaced apart along the axial direction of the stirring head (2); the pin holes (12) are set to two, and a cylindrical pin (3) passes through each pin hole (12), and each cylindrical pin (3) is engaged with the corresponding positioning recess.

5. A stirring rod fixed by a cylindrical pin according to claim 1, characterized in that: The diameter of the pin hole (12) is smaller than the diameter of the insertion hole (11).

6. The stirring rod fixed by a cylindrical pin according to claim 1, characterized in that: The cylindrical pin (3) includes straight rod sections (31) at both ends and a deformable section (32) in the middle. The cylindrical pin (3) and the pin hole (12) are initially clearance fit. During assembly, an external force is applied to the deformable section (32) to cause plastic deformation, resulting in an interference fit between the cylindrical pin (3) and the pin hole (12).

7. A stirring rod fixed by a cylindrical pin according to claim 6, characterized in that: The deformed segment (32) after plastic deformation is an S-shaped structure formed by multiple bending segments.

8. A stirring rod fixed by a cylindrical pin according to claim 1, characterized in that: The stirring head (2) is a straight rod structure or a curved rod structure.

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