A detachable rotor anti-loosening device and a centrifugal mixer provided with the device

Abstract

The application discloses a detachable rotor anti-loosening device and a centrifugal mixing instrument provided with the device, and belongs to the technical field of mechanical design. The rotor anti-loosening device comprises wave bead screws, locking nuts, rotating parts and rotating bases. The rotating part is provided with mounting holes and locking holes, and the rotating base is provided with connecting studs. The locking nut is internally provided with threaded holes, the wave bead screws are connected with the threaded holes, and the lower end portions of the wave bead screws protrude from the lower surface of the locking nut. The locking nut is screwed with the connecting studs penetrating through the mounting holes. The end portions of one of the wave bead screws abut against one of the locking holes, and the end portions of the remaining wave bead screws abut against the end surface of the rotating part and press the rotating part. The device can effectively prevent the rotor from loosening during high-speed rotation, is easy to install and detach, and is convenient for replacing the parts on the main shaft.

Description

Technical Field

[0001] This invention relates to the field of mechanical design technology, specifically to an easily detachable rotor anti-loosening device and a centrifugal mixer equipped with the device. Background Technology

[0002] To facilitate manufacturing and installation, the rotors of most rotating machinery, such as centrifuges, are not a single-piece structure, but rather composed of a spindle and multiple components mounted on it. Because the diameters of the spindle and its mounted components differ, their deformation under centrifugal force also varies. This often leads to loosening of the connections during equipment operation, resulting in safety hazards during high-speed rotation. Currently, the most common method to prevent loosening is interference fit, where the bore diameter of the outer sleeve is smaller than the shaft diameter at the spindle journal. However, interference fits are difficult to assemble, disassemble, and maintain. Another commonly used anti-loosening assembly method is a tapered fit, where the mating surfaces of the mounted components and the spindle are designed as tapered bevels. A clamping mechanism keeps the tapered surfaces in contact, facilitating installation. However, in order to ensure a tight radial fit, it is necessary to press from the axial direction. During the pressing, the components will be displaced axially, resulting in inaccurate axial positioning. At the same time, since the components compensate for the radial clearance by axial displacement when the rotor rotates at high speed, the components and the mandrel cannot return to their initial positions when the rotor is stationary. The fit is similar to an interference fit, and the disassembly process is equally difficult.

[0003] Specifically for centrifuges, the commonly used installation method involves using nuts and other fasteners with spring washers to connect and secure them to the motor shaft. However, this connection method is prone to loosening due to rotor vibration at high speeds or impacts from motor braking, posing a safety hazard during high-speed rotor rotation. Therefore, in practice, tools are typically used for tightening, making installation and disassembly cumbersome. Furthermore, the lack of clear instructions on the tightening force provided by tools makes it easy for individual user differences to lead to improper force application during installation and disassembly, resulting in damage or failure of the fasteners, or even preventing disassembly. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a rotor anti-loosening device, which can not only effectively prevent the rotor from loosening during high-speed rotation, but also is easy to install and disassemble, and facilitates the replacement of parts on the main shaft.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] An easily detachable rotor anti-loosening device includes m ball screws, a locking nut, a rotating component, and a rotating base for connecting to the output shaft of a rotary motor. The rotating component has mounting holes and n circumferentially distributed locking holes, where m ≠ n. The rotating base has connecting studs. The locking nut has a number of threaded holes circumferentially distributed to match the number of ball screws. The ball screws connect to the threaded holes inside the locking nut via their own threads, and the lower end of the ball screw protrudes from the lower surface of the locking nut. The locking nut is screwed to the connecting studs passing through the mounting holes. The end of one ball screw rests in one of the locking holes, and the ends of the remaining ball screws abut against and press against the end face of the rotating component.

[0007] In a preferred embodiment of the present invention, the number of positioning stages between the ball screws and the locking holes is t, where t = |mn / (mn)|. The number of positioning stages refers to the sum of the number of times the ends of all the ball screws are inserted into any locking hole per revolution of the locking nut.

[0008] In a preferred embodiment of the present invention, the number of ball screws m is 5, the number of locking holes n is 4, and the positioning level t between the ball screws and the locking holes is 20.

[0009] In a preferred embodiment of the present invention, the rotor anti-loosening device of the present invention further includes a positioning pin; at least one positioning hole is provided on the rotating component, and at least one pin hole is provided inside the rotating base; the positioning pin passes through the positioning hole and is installed in the pin hole of the rotating base.

[0010] In a preferred embodiment of the present invention, the outer surface of the ball screw is provided with threads, the upper end of the ball screw is provided with an internal hexagonal hole, and the lower end is provided with a mounting cavity; the lower end of the ball screw is provided with a movable steel ball, and the steel ball is pushed against the opening of the mounting cavity by a spring located in the mounting cavity.

[0011] In a preferred embodiment of the present invention, the outer surface of the locking nut is provided with anti-slip texture.

[0012] In a preferred embodiment of the present invention, the locking hole of the rotating component and the threaded hole of the locking nut have a distribution circle with the same diameter.

[0013] The present invention also provides a centrifugal mixer, which includes a housing and a cover hinged to the housing. A rotary motor is disposed inside the housing. A centrifugal cavity is formed between the housing and the cover. An easily detachable rotor anti-loosening device as described above is installed in the centrifugal cavity. The rotating component is a rotating frame. The output shaft of the rotary motor extends into the centrifugal cavity and is fixedly connected to the rotating base.

[0014] In a preferred embodiment of the present invention, the rotating rack is square, and a first centrifuge tube carrier is symmetrically arranged on any two opposite sides of the rotating rack, and a second centrifuge tube carrier is symmetrically arranged on the other two opposite sides of the rotating rack.

[0015] In a preferred embodiment of the present invention, the rotating carrier is circular, and a third centrifuge tube carrier extends outward from the outer edge of the rotating carrier at an angle.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The easily detachable rotor anti-loosening device provided by this invention employs a scientifically ingenious structural design. When the locking nut is tightened onto the connecting stud, the end of one of the ball screws rests within one of the locking holes, providing a locking effect and preventing radial displacement of the locking nut during high-speed rotation, resulting in excellent anti-loosening performance. Simultaneously, the ends of the remaining ball screws abut against the end face of the rotating component, pressing it down and preventing axial displacement during high-speed rotation, ensuring a strong fastening effect and reliable connection. Furthermore, when the locking nut is rotated, causing the end of the ball screw to spring into the locking hole, the vibration of the ball screw's spring during this process provides a tactile feedback to the user, while the collision between the ball screw's steel ball and the rotating component produces an audible feedback, allowing the user to properly control the rotation force and effectively preventing damage to the locking nut due to improper force. In addition, this invention uses the locking nut as a fixing component, enabling tool-free installation and removal of the rotating component. Compared to traditional anti-loosening methods that use spring washers, this significantly reduces the required rotational torque, making it more convenient for users and greatly improving the user experience. The easily detachable rotor anti-loosening device of the present invention is applicable not only to centrifugal devices, but also to other rotating mechanical structures.

[0018] The centrifugal mixer provided by this invention can not only effectively prevent the rotating rack from coming loose during high-speed rotation, but is also easy to install and disassemble, greatly improving loading and unloading efficiency and facilitating the replacement of the rotating rack, thus making the centrifugal mixer more widely applicable. Attached Figure Description

[0019] Figure 1 This is a perspective view of the easily detachable rotor anti-loosening device described in this invention;

[0020] Figure 2 This is an exploded view of the easily detachable rotor anti-loosening device described in this invention;

[0021] Figure 3 This is a top view of the easily detachable rotor anti-loosening device described in this invention;

[0022] Figure 4This is a cross-sectional view of the easily detachable rotor anti-loosening device described in this invention;

[0023] Figure 5 This is a schematic diagram of the structure of the ball screw installed in the lock nut according to the present invention;

[0024] Figure 6 This is a cross-sectional view of the ball screw described in this invention;

[0025] Figure 7 This is a cross-sectional view of the centrifugal mixer described in this invention;

[0026] Figure 8 This is a schematic diagram of the structure of the rotating storage rack described in some embodiments of the present invention;

[0027] Figure 9 This is a schematic diagram of the structure of the rotating storage rack according to other embodiments of the present invention;

[0028] Explanation of reference numerals: 1. Locking nut; 11. Threaded hole; 2. Rotating component; 21. Mounting hole; 22. Locking hole; 23. Positioning hole; 3. Rotating base; 31. Connecting stud; 32. Pin hole; 4. Ball screw; 41. Socket headstock hole; 42. Steel ball; 43. Spring; 5. Positioning pin; 6. Housing; 7. Cover; 8. Rotating motor; 9. Rotating rack; 91. First centrifuge tube carrier; 92. Second centrifuge tube carrier; 93. Third centrifuge tube carrier. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1-4 As shown, the easily detachable rotor anti-loosening device of the present invention includes a locking nut 1 used as a fixing component, a rotating component 2, a rotating base 3 for connecting to the output shaft of a rotating motor 8, and m ball screws 4. The rotating component 2 is provided with mounting holes 21 for fitting the rotating component 2 onto the rotating base 3, and n locking holes 22 evenly distributed circumferentially around the mounting holes 21, where m ≠ n. The lower end face of the rotating base 3 is provided with a connecting hole for connecting to the rotating motor 8, and the upper end face is provided with a connecting stud 31. The rotating component 2 is fitted onto the connecting stud 31 through the mounting holes 21. Figure 2 and Figure 5As shown, the locking nut 1 has a threaded hole 11 along its center along the axial direction for tightening with the connecting stud 31 of the rotating base 3. The inner circumference of the locking nut 1 has a number of threaded holes 11 matching the number of ball screws 4. The threaded holes 11 of the locking nut 1 and the locking holes 22 of the rotating component 2 have the same diameter distribution circle. The ball screws 4 connect to the threaded holes 11 inside the locking nut 1 through their own threads, and the lower end of the ball screws 4 protrudes from the lower surface of the locking nut 1. The locking nut 1 is screwed onto the connecting stud 31. When the locking nut 1 is tightened onto the connecting stud 31, the end of one ball screw 4 rests in one of the locking holes 22, while the ends of the remaining ball screws 4 abut against and press against the end face of the rotating component 2. Therefore, this invention uses one of the ball screws 4, with its end pressing against one of the locking holes 22, to achieve a locking effect, preventing radial displacement of the locking nut 1 during high-speed rotation and providing good anti-loosening performance. Meanwhile, the ends of the remaining ball screws 4 abut against the end face of the rotating component 2, pressing the rotating component 2 to prevent axial displacement during high-speed rotation, resulting in good fastening effect and strong connection reliability. Furthermore, this invention uses the locking nut 1 as a fixing component, allowing for tool-free installation and removal of the rotating component 2. Compared to the traditional anti-loosening method using a spring 43 washer, this significantly reduces the required rotational torque, making it more convenient for users and greatly improving the user experience.

[0031] When the locking nut 1 is rotated, causing the end of the ball screw 4 to spring into the locking hole 22, the vibration of the spring 43 of the ball screw 4 during the springing process provides a tactile feedback to the user. The collision between the steel ball 42 of the ball screw 4 and the rotating component 2 produces an audible feedback, allowing the user to properly control the rotation force and effectively preventing damage to the locking nut 1 due to improper force. As the locking nut 1 is continuously tightened, multi-stage vibrations and audible feedback occur as the steel ball 42 springs into the locking hole 22. Taking a number of ball screws 4 (m) of 5 and a number of locking holes 22 (n) of 4 as an example, the 72° (360° / 5) angle difference between the ball screws 4 and the 90° (360° / 4) angle difference between the locking holes 22 of the rotating part 2 can be used to calculate the 20 vibrations and sound feedbacks (360° / (90°-72°)) obtained when the locking nut 1 rotates one revolution. Similarly, by changing the ratio of the number of ball screws 4 and the number of locking holes 22, other levels of vibration feedback can be obtained. Therefore, the sum of the number of times the ends of all ball screws 4 are inserted into any locking hole 22 when the locking nut 1 rotates one revolution can be defined as the positioning level t. The quantitative relationship between the positioning level t and the number of ball screws 4 (m) and locking holes 22 (n) is as follows: t=|mn / (mn)︱. Figure 5 As shown, when the number of ball screws 4 (m) is 5 and the number of locking holes 22 (n) is 4, the number of positioning stages (t) between the ball screws 4 and the locking holes 22 is 20.

[0032] To achieve rapid installation, the rotor anti-loosening device of the present invention further includes at least one positioning pin 5. Correspondingly, the rotating component 2 is provided with at least one positioning hole 23, and the rotating base 3 is provided with at least one pin hole 32. The positioning pin 5 passes through the positioning hole 23 and is installed in the pin hole 32 of the rotating base 3. The rapid positioning of the rotating component 2 is achieved through the cooperation of the positioning pin 5 and the pin hole 32, thereby improving the installation efficiency. In some embodiments, the number of positioning pins 5, positioning holes 23, and pin holes 32 are all two and symmetrically arranged. To achieve rapid installation and removal, the outer surface of the locking nut 1 is provided with anti-slip texture for easy hand tightening.

[0033] Specifically, such as Figure 6 As shown, the outer surface of the ball screw 4 is provided with an external thread that matches the threaded hole 11. The upper end of the ball screw 4 is provided with an internal hexagonal hole 41 to facilitate its installation in the lock nut 1. The lower end of the ball screw 4 has a mounting cavity; a movable steel ball 42 is embedded in the lower end of the ball screw 4, and the steel ball 42 is pressed against the opening of the mounting cavity by a spring 43 located in the mounting cavity. When the ball screw 4 is installed inside the lock nut 1, the steel ball 42 protrudes from the lower end face of the lock nut 1.

[0034] The working principle of the present invention will be explained below using an embodiment where the number of ball screws 4 (m) is 5 and the number of locking holes 22 (n) is 4.

[0035] During initial installation, first screw the locking nut 1 onto the connecting stud 31 of the rotating base 3. As the locking nut 1 is gradually tightened on the connecting stud 31, the steel balls 42 at the ends of the five ball screws 4 on the locking nut 1 first contact the surface of the rotating part 2. As the locking nut 1 continues to tighten, the steel balls 42 at the ends of the ball screws 4 are subjected to positive pressure and begin to compress, while simultaneously rolling on the surface of the rotating part 2 and achieving a clamping effect; Figure 3As shown, when the locking nut 1 is rotated to a certain angle, the steel ball 42 at the end of one of the ball screws 4 is concentric with one of the locking holes 22 of the rotating part 2. Under the action of the elastic force, the steel ball 42 springs into the locking hole 22. The vibration generated during the springing process is transmitted to the user through the locking nut 1, thus producing a tactile feedback. At the same time, the collision between the steel ball 42 of the ball screw 4 and the rotating part 2 produces an audible feedback. The combination of tactile and audible feedback allows the user to properly control the rotation force, effectively avoiding damage to the locking nut 1 due to improper force and preventing the locking nut 1 from loosening due to reverse rotation. When the locking nut 1 continues to tighten, the steel ball 42 at the end of the ball screw 4 will spring into or out of the locking hole 22 in sequence, thus forming a continuous multi-level vibration feedback tactile and audible feedback. At the same time, the tightening force continues to increase until the lower end face of the locking nut 1 contacts the upper surface of the rotating part 2, thus completing the locking of the locking nut 1.

[0036] In summary, the rotor anti-loosening device of the present invention not only effectively prevents the rotating component 2 from loosening during high-speed rotation, but is also easy to install and disassemble, facilitating the replacement of parts on the main shaft. The easy-to-disassemble rotor anti-loosening device of the present invention is applicable not only to centrifugal devices, but also to other rotating mechanical structures.

[0037] like Figure 7 As shown, the present invention also provides a centrifugal mixer, which includes a housing 6 and a cover 7 hinged to the housing 6. A rotary motor 8 is installed inside the housing 6, and a centrifugal chamber is formed between the housing 6 and the cover 7. The centrifugal chamber is equipped with an easily detachable rotor anti-loosening device as described above. The rotating component 2 is a rotating carrier 9. The output shaft of the rotary motor 8 extends into the centrifugal chamber and is fixedly connected to the rotating base 3. The rotary motor 8 drives the rotating base 3 to rotate the rotating carrier 9. During repeated high-speed forward and reverse rotation, the rotating carrier 9 is locked by the engagement of one ball screw 4 with a locking hole 22, and is pressed by the remaining ball screws 4, thereby achieving an anti-loosening effect. At the same time, the design of the locking nut 1 allows for quick installation and removal by hand. It can be seen that this centrifugal mixer can not only effectively prevent the rotating carrier 9 from loosening during high-speed rotation, but is also easy to install and disassemble, greatly improving the loading and unloading efficiency and facilitating the replacement of the rotating carrier 9, thus making the centrifugal mixer more widely applicable.

[0038] In some embodiments, such as Figure 8As shown, the rotating rack 9 is square. First centrifuge tube carriers 91 are symmetrically arranged on either opposite side of the rotating rack 9. Each first centrifuge tube carrier 91 has two rows of holes, with eight holes in each row, suitable for centrifuging and mixing eight-tube centrifuges. Second centrifuge tube carriers 92 are symmetrically arranged on the other opposite side of the rotating rack 9. Each second centrifuge tube carrier 92 has two holes, suitable for centrifuging and mixing 1.5ml or 2ml centrifuge tubes. In other embodiments, such as... Figure 9 As shown, the rotating carrier 9 is circular, and a third centrifuge tube carrier 93 extends outward from the outer edge of the rotating carrier 9. The third centrifuge tube carrier 93 has multiple holes evenly distributed on it. The first centrifuge tube carrier 91, the second centrifuge tube carrier 92 and the third centrifuge tube carrier 93 are all inclined, with an inclination angle of 15 to 30°.

[0039] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. An easily detachable rotor anti-loosening device, characterized in that: The device includes m ball screws, a lock nut, a rotating component, and a rotating base for connecting to the output shaft of a rotary motor. The rotating component has mounting holes and n evenly distributed locking holes, where m ≠ n. The rotating base has connecting studs. The outer surface of the lock nut has anti-slip textures, and the inner circumference of the lock nut has a number of threaded holes matching the number of ball screws. The ball screws connect to the threaded holes inside the lock nut via their own threads, with the lower end of the ball screw protruding from the lower surface of the lock nut. The outer surface of the ball screw is threaded, the upper end of the ball screw has an internal hexagonal hole, and the lower end has a mounting cavity. The lock nut is screwed to the connecting studs passing through the mounting holes. The end of one ball screw rests in one of the locking holes, and the ends of the remaining ball screws abut against and press against the end face of the rotating component. The positioning stages between the ball screw and the locking hole are t, where t = |mn / (mn)|. The positioning stages refer to the sum of the number of times the ends of all the ball screws are inserted into any locking hole when the locking nut rotates once.

2. The easily detachable rotor anti-loosening device according to claim 1, characterized in that: The number of ball screws m is 5, the number of locking holes n is 4, and the number of positioning stages t between the ball screws and the locking holes is 20.

3. The easily detachable rotor anti-loosening device according to claim 1 or 2, characterized in that: It also includes a positioning pin; the rotating component is provided with at least one positioning hole, and the rotating base is provided with at least one pin hole; the positioning pin passes through the positioning hole and is installed in the pin hole of the rotating base.

4. The easily detachable rotor anti-loosening device according to claim 1 or 2, characterized in that: The lower end of the ball screw is provided with a movable steel ball, which is pressed against the opening of the mounting cavity by a spring located in the mounting cavity.

5. The easily detachable rotor anti-loosening device according to claim 1 or 2, characterized in that: The locking hole of the rotating component and the threaded hole of the locking nut have a distribution circle with the same diameter.

6. A centrifugal mixer, characterized in that: The device includes a housing and a cover hinged to the housing. A rotary motor is installed inside the housing. A centrifuge chamber is formed between the housing and the cover. An easily detachable rotor anti-loosening device as described in claim 1 is installed in the centrifuge chamber. The rotating component is a rotating frame. The output shaft of the rotary motor extends into the centrifuge chamber and is fixedly connected to the rotating base.

7. The centrifugal mixer according to claim 6, characterized in that: The rotating rack is square, with first centrifuge tube carriers symmetrically arranged on either of the opposite sides of the rotating rack, and second centrifuge tube carriers symmetrically arranged on the other opposite sides of the rotating rack.

8. The centrifugal mixer according to claim 6, characterized in that: The rotating container is circular, and a third centrifuge tube plate extends outward from the outer edge of the rotating container at an angle.

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