Detachable stirring rod

Abstract

The detachable stirring rod comprises a power shaft and a stirring screw rod, a butt joint column is movably spliced with a first concave position through a second concave position so that the stirring screw rod can be coaxial with the power shaft, a limiting sleeve is slidably arranged on the periphery of the splicing position of the butt joint column and the power shaft in a sleeved mode, and the stirring screw rod is prevented from being separated from the power shaft through the limiting sleeve. A pair of protruding blocks is arranged at the bottom of the limiting sleeve, receding positions are inwards arranged on the two sides of the periphery of the butt joint column, the limiting sleeve is rotated to enable the inner walls of the protruding blocks to be attached to the periphery of the butt joint column to achieve locking or enable the protruding blocks to be located in the receding positions, and the limiting sleeve slides upwards to enable the butt joint column and the power shaft to be disconnected. Compared with the prior art, the stirring device has the beneficial effects that through the connection mode of the stirring screw and the power shaft and the mode of matching with the limiting sleeve, the connection structure is greatly simplified, the quick disassembly function is realized, and the equipment cleaning cost and the disassembly and assembly time are effectively reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of material supply equipment, and in particular to a detachable stirring rod. Background Technology

[0002] In multi-row automatic packaging machines, especially for quantitative filling and packaging of fine powder materials such as milk powder, protein powder, flavoring powder, and pharmaceutical powder, the mixing screw is the core conveying component. Its working principle is as follows: the drive shaft drives the mixing screw to rotate within a fixed feed tube. The screw grooves continuously and stably push the material from the feed hopper to the discharge port, thus achieving precise feeding for each row of packages. The stability, maintainability, and adaptability of this device directly affect the overall production efficiency, metering accuracy, and operating costs of the packaging machine.

[0003] Currently, the widely used screw agitator has gradually revealed the following two interrelated technical defects that urgently need to be addressed in long-term practice:

[0004] 1. The connection structure between the screw and the drive shaft is cumbersome to disassemble and assemble, resulting in low maintenance efficiency. In existing technologies, the stirring screw is typically fixed to the drive shaft via a keyway or keyway, a direct threaded connection, or radial locking with a set screw. While these connection methods can transmit torque, they are extremely inconvenient when frequent cleaning is required (e.g., when switching material types or preventing cross-contamination) or when replacing worn screws. For example, keyed connections require precise alignment and a large axial force for insertion and removal, threaded connections are prone to seizing after being soaked in powder, and set screws are prone to stripping or trapping material. Each disassembly and installation requires operators to use multiple tools, thus consuming a significant amount of time and manpower, severely limiting the equipment's availability in production lines requiring high hygiene standards or rapid changeovers. This not only increases equipment downtime but also raises maintenance complexity and labor costs.

[0005] 2. The feeding process relies excessively on the material's own fluidity, which can easily lead to blockages and unstable metering. Existing equipment typically uses the following feeding method: powdered material is stored in an upper hopper and flows naturally under gravity, or is guided only by a simple conical funnel at the bottom of the hopper, converging into a single feed port that connects to the mixing screw. This design implicitly assumes that the material always possesses good and stable fluidity.

[0006] However, the characteristics of powdered materials handled in actual production vary greatly—changes in parameters such as particle size distribution, humidity, shape, density, and internal friction coefficient significantly affect their flow behavior. For materials with poor flowability (such as powders that are prone to absorbing moisture and clumping, have large particles, are lightweight and fluffy, or have adhesive properties), "bridging" (material forming an arched void above the outlet and stopping flow) or "mouse hole" (only the central part of the material flows) are very likely to occur in traditional feed box and inlet structures. When the mixing screw rotates, if its screw channels are not evenly and densely filled with material, local idling or conveying interruptions will occur. This not only directly leads to inaccurate single-row feeding and affects packaging accuracy, but also causes material to gradually accumulate at the inlet due to untimely replenishment, eventually developing into complete blockage, forcing the production line to stop for manual unblocking, disrupting the continuity of production and automation efficiency.

[0007] In summary, existing mixing screw devices suffer from inconvenient maintenance due to the non-quick-release nature of their connection structure, and are prone to clogging and unstable metering due to the passive dependence of their feeding structure on material flowability. These two shortcomings together limit the application of multi-row packaging machines in more complex material systems, with higher hygiene requirements, and in higher-efficiency production scenarios. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a detachable stirring rod.

[0009] To achieve the above objectives, this utility model discloses a detachable stirring rod, including a power shaft and a stirring screw. The outer periphery of the end of the power shaft is provided with a first concave position, and the top end of the stirring screw is provided with a connecting post. The connecting post is provided with a second concave position. The connecting post is movably connected to the first concave position through the second concave position, so that the stirring screw is coaxial with the power shaft. A limiting sleeve is slidably sleeved on the outer periphery of the connection between the connecting post and the power shaft. The limiting sleeve prevents the stirring screw from disengaging from the power shaft during rotation, thereby realizing the transmission of rotational power.

[0010] The bottom of the limiting sleeve is provided with a pair of protrusions, and the two sides of the outer periphery of the docking post are provided with clearance positions. Rotating the limiting sleeve causes the inner walls of the pair of protrusions to fit against the outer periphery of the docking post to achieve a stop or to place the protrusions in the clearance positions. Sliding the limiting sleeve upwards causes the docking post to be disengaged from the power shaft.

[0011] Furthermore, it also includes a spiral stirring part, which is adjustablely disposed on the outer periphery of the handle of the stirring screw. The spiral stirring part rotates with the stirring screw, and the position of the spiral stirring part on the handle can be slidably adjusted to control the distance between the spiral stirring part and the spiral part of the stirring screw.

[0012] Furthermore, the spiral stirring part includes an annular seat and spiral blades. The annular seat is slidably disposed on the outer periphery of the handle of the stirring screw, and the spiral blades are spirally disposed from the bottom of the annular seat and along the outer periphery of the docking post downwards.

[0013] Furthermore, a locking plane is provided on the outer periphery of the handle, and a first through hole and a second through hole are provided on the outer periphery of the annular seat. Screws are threaded onto the first through hole and the second through hole, respectively, and their threads are respectively screwed onto the locking plane and the outer periphery of the handle.

[0014] Furthermore, the bottom of the limiting sleeve abuts against the top of the stirring screw.

[0015] The diameter of the docking post is the same as the diameter of the power shaft, and the inner diameter of the limiting sleeve corresponds to the diameters of the power shaft and the docking post.

[0016] Furthermore, the distance between a pair of protrusions is equal to the diameter of the stirring screw, the inner wall of the protrusion is in an arc shape that fits against the outer periphery of the stirring screw, and the diameter between the clearance positions is smaller than the distance between a pair of protrusions.

[0017] Furthermore, a limiting post is horizontally extended on the outer periphery of each of the two clearance positions, and the two limiting posts are staggered one after the other. The protrusion is in contact with the outer periphery of the stirring screw and abuts against the limiting post.

[0018] Furthermore, the direction of rotation of the protrusion to the clearance position is opposite to the direction of rotation of the power shaft.

[0019] Furthermore, the outer periphery of the stirring screw is provided with an annular groove, and the inner wall of the protrusion is provided with an insertion part, which is movably inserted into the annular groove as the limiting sleeve rotates.

[0020] Furthermore, the first recessed part and the second recessed part are connected by a snap-fit ​​mechanism to achieve a mechanical connection between the stirring screw and the power shaft.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. The connection method between the stirring screw and the power shaft, as well as the matching limiting sleeve, greatly simplifies the connection structure and enables quick disassembly, effectively reducing the cost and disassembly time during equipment cleaning.

[0023] 2. The locking mechanism of the limit sleeve has a three-layer protective structure, which further improves the connection stability between the stirring screw and the power shaft.

[0024] 3. A spiral stirring section is set at the end of the stirring screw shank to press the material. At the same time, the spiral stirring section can be slidably set to adapt to materials with different flowability, making the equipment highly adaptable and capable of diversified production. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the limiting sleeve when it is far from the joint between the handle and the drive shaft in this embodiment.

[0026] Figure 2 This is a schematic diagram showing the connection state between the power shaft and the handle in this embodiment;

[0027] Figure 3 This is a schematic diagram of the limiting sleeve in the avoidance position in this embodiment;

[0028] Figure 4 This is a schematic diagram showing the fit between the protrusion of the limiting sleeve and the outer periphery of the handle in this embodiment. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will be combined with... Figures 1-4 The accompanying drawings provide a further detailed description of this utility model.

[0030] Reference Figure 1 and Figure 2 As shown, a detachable stirring rod includes a power shaft 1, a stirring screw 2, and a spiral stirring part 3, the spiral stirring part 3 being slidably disposed on the handle 21 of the stirring screw 2.

[0031] A first recessed position 11 is provided on the outer periphery of the end of the power shaft 1, and a docking post 22 is provided on the top of the handle 21 protruding upward from the center. In this embodiment, the diameter of the docking post 22 is the same as the diameter of the power shaft 1. A second recessed position 23 is provided on the outer periphery of the docking post 22 to cooperate with the first recessed position 11. A limit sleeve 4 is slidably provided on the outer periphery between the power shaft 1 and the docking post 22.

[0032] The shapes of the first concave position 11 and the second concave position 23 in this embodiment and their splicing method are well-known technologies in the field and will not be described here.

[0033] In use, the first concave part 11 and the second concave part 23 are spliced ​​together, so that the power shaft 1 and the stirring screw 2 are mechanically connected coaxially and the rotational power is transmitted. At the same time, the limiting sleeve 4 is slidably set on the outer periphery of the splice between the power shaft 1 and the stirring screw 2 to prevent the stirring screw 2 from disengaging from the power shaft 1 when rotating. The bottom of the limiting sleeve 4 is in contact with the top of the stirring screw 2.

[0034] It should be noted that the diameter of the inner hole of the limiting sleeve 4 corresponds to the diameter of the power shaft 1 and the docking column 22.

[0035] Reference Figure 1 and Figure 3 As shown, further, a pair of protrusions 41 are provided extending downward from the bottom edge of the limiting sleeve 4, and the pair of protrusions 41 are symmetrically arranged with the center of the limiting sleeve 4 as the center. The distance between the pair of protrusions 41 is equal to the diameter of the stirring screw 2.

[0036] The outer periphery of the top of the handle 21 is provided with a clearance position 24 on both sides, and a limit post 25 is provided horizontally outward from the outer periphery of the clearance position 24. The two limit posts 25 are staggered.

[0037] In this embodiment, the inner wall of the protrusion 41 is an arc shape that fits against the outer periphery of the stirring screw 2.

[0038] Reference Figure 4 As shown, when the limiting sleeve 4 is slidably set on the outer periphery of the splice between the power shaft 1 and the stirring screw 2, the limiting sleeve 4 is rotated so that the inner wall of the protrusion 41 contacts the outer periphery of the stirring screw 2, and at the same time the protrusion 41 abuts against the limiting post 25, thereby preventing the limiting sleeve 4 from rotating, and at this time it is in a locked state.

[0039] Reference Figure 3 As shown, when the limiting sleeve 4 needs to slide upward, the limiting sleeve 4 is rotated so that its protrusion 41 is in the clearance position 24. Since the distance between the clearance positions 24 is less than the distance between a pair of protrusions 41, the limiting sleeve 4 can slide upward to the upper half of the power shaft 1 to realize the disassembly of the docking column 22 and the power shaft 1.

[0040] It should be noted that the unlocking rotation direction of the limit sleeve 4 is opposite to the rotation direction of the power shaft 1.

[0041] Reference Figure 1 and Figure 4 As shown, further, an annular groove 26 is provided on the outer periphery of the handle 21, and an insertion part 42 protrudes from the inner wall of the protrusion 41. The insertion part 42 is movably inserted into the annular groove 26 as the limiting sleeve 4 rotates. Compared with the prior art, by engaging the insertion part 42 with the annular groove 26 to abut the limiting sleeve 4 against the stirring screw 2, the limiting sleeve 4 is further prevented from sliding upward, ensuring the connection and stability of the stirring screw 2 and the power shaft 1 during operation.

[0042] In this embodiment, the connection method between the stirring screw 2 and the power shaft 1, as well as the method of using the limiting sleeve 4, compared with the existing multi-row powder screw connection method, simplifies the connection structure and achieves the function of quick disassembly, effectively reducing the cost and disassembly time during equipment cleaning, and effectively reducing the overall height of the feeding device, thus effectively reducing the production cost of the equipment.

[0043] Regarding the connection between the stirring screw 2 and the power shaft 1, this embodiment provides three layers of protection. The first layer of protection is that the limiting sleeve 4 fits against the outer periphery of the stirring screw 2 through the protrusion 41. The second layer of protection is that the unlocking direction of the limiting sleeve 4 is opposite to the rotation direction of the stirring screw 2. When the central rotating rod rotates in actual use, the centrifugal force generated, together with the limiting post 25, reliably limits the limiting sleeve 4 to the outer periphery of the two shafts. The third layer of protection is that an avoidance position 24 is set, and an upward sliding force is applied to the limiting sleeve 4. The limiting sleeve 4 can also be slid upward. In summary, the three layers of protection greatly improve the connection stability of the stirring screw 2.

[0044] Reference Figure 1 As shown, the spiral stirring unit 3 includes an annular seat 31 and spiral blades 32. The annular seat 31 is slidably disposed on the handle 21 of the stirring screw 2, and the spiral blades 32 are spirally arranged from the bottom of the annular seat 31 along the outer circumference of the stirring screw. Specifically, the starting end of the spiral blades 32 is welded to the bottom of the annular seat 31.

[0045] Furthermore, a locking plane 27 is provided on the outer periphery of the handle 21 of the stirring screw 2, and the locking plane 27 is located in the lower half of the handle 21. A first through hole 311 and a second through hole 312 are provided on the outer periphery of the annular seat 31. During installation, the first through hole 311 is aligned with the locking plane 27, and a screw (not shown in the figure) is threaded onto the first through hole 311. The end of the screw abuts against the locking plane 27 to limit the annular seat 31 to the handle 21. A screw (not shown in the figure) is threaded onto the second through hole 312, and the end of the screw abuts against the outer periphery of the handle to further limit the annular seat 31.

[0046] As is well known, in practical use, the spiral part of the stirring screw is located in the discharge port of the hopper (not shown in the figure). The powder material is conveyed by its own fluidity or by the guiding structure at the bottom of the hopper, flowing to the discharge port and further conveyed by the stirring screw. When conveying powder materials of different particle sizes, due to their varying fluidity, relying solely on the material's own flow in conjunction with the stirring screw can easily lead to clogging. This embodiment features a spiral stirring part at the end of the handle to act as a pressure agent. Simultaneously, the spiral stirring part is slidably positioned, allowing its height on the handle to adjust according to the material's fluidity, thus changing the distance between it and the spiral part of the stirring screw. This achieves more stable and efficient powder material conveying, and reduces the likelihood of clogging or voids.

[0047] This equipment is highly adaptable and suitable for diverse production processes. The simple structure of the spiral mixing section facilitates disassembly and cleaning.

[0048] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They cannot be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit of the main technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A detachable stirring rod, characterized in that, The device includes a power shaft (1) and a stirring screw (2). The outer periphery of the end of the power shaft (1) is provided with a first concave part (11). The top end of the stirring screw (2) is provided with a docking post (22). The docking post (22) is provided with a second concave part (23). The docking post (22) is movably spliced ​​with the first concave part (11) through the second concave part (23) so that the stirring screw (2) is coaxial with the power shaft (1). A limiting sleeve (4) is slidably sleeved on the outer periphery of the splice between the docking post (22) and the power shaft (1). The limiting sleeve (4) prevents the stirring screw (2) from disengaging from the power shaft (1) when rotating, so as to realize the transmission of rotational power. The bottom of the limiting sleeve (4) is provided with a pair of protrusions (41), and the two sides of the outer periphery of the docking post (22) are provided with clearance positions (24). Rotating the limiting sleeve (4) causes the inner walls of the pair of protrusions (41) to fit against the outer periphery of the docking post (22) to achieve a stop or to make the protrusions (41) located in the clearance positions (24). The limiting sleeve (4) is then slid upward to disengage the docking post (22) from the power shaft (1).

2. The detachable stirring rod according to claim 1, characterized in that, It also includes a spiral stirring part (3), which is adjustablely disposed on the outer periphery of the handle (21) of the stirring screw (2). The spiral stirring part (3) rotates with the stirring screw (2), and the position of the spiral stirring part (3) on the handle (21) is slidably adjusted to control the distance between the spiral stirring part (3) and the spiral part of the stirring screw (2).

3. The detachable stirring rod according to claim 2, characterized in that, The spiral stirring part (3) includes an annular seat (31) and spiral blades (32). The annular seat (31) is slidably disposed on the outer periphery of the handle (21) of the stirring screw (2). The spiral blades (32) are spirally disposed from the bottom of the annular seat (31) and along the outer periphery of the docking post (22).

4. The detachable stirring rod according to claim 3, characterized in that, The outer periphery of the handle (21) is provided with a locking plane (27), and the outer periphery of the annular seat (31) is provided with a first through hole (311) and a second through hole (312). The first through hole (311) and the second through hole (312) are respectively threaded with screws, and the screws are respectively threaded onto the locking plane (27) and the outer periphery of the handle (21).

5. The detachable stirring rod according to claim 1, characterized in that, The bottom of the limiting sleeve (4) abuts against the top of the stirring screw (2); The diameter of the docking post (22) is the same as the diameter of the power shaft (1), and the inner diameter of the limiting sleeve (4) corresponds to the diameter of the power shaft (1) and the docking post (22).

6. The detachable stirring rod according to claim 1, characterized in that, The distance between a pair of protrusions (41) is equal to the diameter of the stirring screw (2), the inner wall of the protrusion (41) is an arc shape that fits against the outer periphery of the stirring screw (2), and the diameter between the clearance positions (24) is smaller than the distance between a pair of protrusions (41).

7. The detachable stirring rod according to claim 1, characterized in that, Limiting posts (25) are horizontally extended on the outer periphery of a pair of clearance positions (24). The two limiting posts (25) are staggered front and back. The protrusion (41) fits against the outer periphery of the stirring screw (2) and abuts against the limiting post (25).

8. The detachable stirring rod according to claim 1, characterized in that, The direction of rotation of the protrusion (41) to the clearance position (24) is opposite to the direction of rotation of the power shaft (1).

9. The detachable stirring rod according to claim 1, characterized in that, The outer periphery of the stirring screw (2) is provided with an annular groove (26), and the inner wall of the protrusion (41) is provided with a plug-in part (42). The plug-in part (42) is movably inserted into the annular groove (26) as the limiting sleeve (4) rotates.

10. The detachable stirring rod according to claim 1, characterized in that, The first recessed part (11) and the second recessed part (23) are connected by a snap-fit ​​to make the stirring screw (2) and the power shaft (1) mechanically connected.

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