Centrifugal mechanism with precision positioning

Abstract

The utility model relates to centrifuge equipment technical field discloses a kind of centrifugal mechanism with accurate positioning, comprising: locating disc, the locating disc includes: locating hole, set up on the locating disc and penetrate the locating disc, for auxiliary positioning;Further comprising: driving device, output end vertical upward, follow the rotating of the locating disc;Positioning pin, fixedly connected in the top of the driving device output end, size and the corresponding locating hole, for inserting the locating hole and fixing the locating disc.In the utility model, through the cooperation of positioning pin and locating hole, and the guiding effect of auxiliary positioning piece, even in rotor shaft hole, main shaft or brake pad appears abrasion and leads to initial alignment deviation, still can realize the accurate fixing of locating disc and rotor, to solve the problem of positioning error in prior art due to abrasion, avoid the trouble of repeatedly adjusting rotor position after shutdown, improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of centrifuge equipment technology, and in particular to a centrifuge mechanism with precise positioning. Background Technology

[0002] A centrifuge is a device that uses centrifugal force to separate mixtures and is widely used in fields such as biology, chemical engineering, and medicine. Its core function is to generate powerful centrifugal force through high-speed rotation, allowing substances of different densities or particle sizes to be separated in a centrifugal field. Some centrifuges have an automatic positioning function, which allows the high-speed rotating rotor to precisely stop at a preset position, avoiding the hassle and risk of manual adjustment. This is particularly advantageous when processing multiple samples or high-speed equipment.

[0003] In existing technologies, automatic positioning is typically achieved through motor braking control or variable frequency drive technology. However, long-term high-speed rotation can lead to wear on the rotor shaft hole or main shaft, increasing the gap between them. This causes radial or axial wobble in the rotor during rotation, and the angle will naturally shift when it stops. Simultaneously, worn brake pads result in uneven braking force, causing the "braking force" to fluctuate during rotor deceleration, making it impossible to stop according to the preset curve and further increasing positioning errors. Positioning errors necessitate repeated rotor position adjustments after each stop to locate the sample, potentially extending the single operation time from 10 seconds to 1 minute. For automated experimental lines, positioning errors can also cause the robotic arm to fail to pick up or place samples, triggering a shutdown of the entire process.

[0004] Therefore, this application provides a centrifuge mechanism with precise positioning to meet the requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a centrifugal mechanism with precise positioning to solve the problem that the wear of the rotor shaft hole, main shaft or brake pads will cause positioning errors and reduce work efficiency.

[0006] To solve the problems mentioned above, this utility model is implemented through the following technical solution.

[0007] A centrifuge mechanism with precise positioning, comprising: Positioning disk, the positioning disk comprising: A positioning hole is formed on the positioning disk and extends through the positioning disk to assist in positioning. Also includes: The drive device has its output end pointing vertically upwards and rotates following the positioning disk. A positioning pin is fixedly connected to the top of the output end of the drive device. Its size corresponds to the positioning hole, and it is used to insert into the positioning hole to fix the positioning plate.

[0008] Preferably, the positioning disk further includes: A groove, which is annular and has the same width as the positioning disk, is formed at the bottom of the positioning disk. A transition surface is formed at the connection between the slide groove and the positioning plate, so that the connection between the positioning plate and the slide groove is at an angle.

[0009] Preferably, it further includes: An auxiliary positioning component is fixedly connected to the side of the positioning pin near the positioning hole; The rotor has several slots at the top for inserting test tubes, and rotates to provide centrifugal force to the test tubes. A drive motor is fixed to the bottom of the rotor, and its output end extends upward and is fixedly connected to the bottom of the rotor; A protective cover is disposed on the outside of the rotor and is fixedly connected to the drive motor and rotatably connected to the output end of the drive motor; it is used to protect the rotor.

[0010] Preferably, it further includes: The connecting ears are provided in multiple sets, each set consisting of two parts. One part is fixedly connected to the bottom of the rotor, and the other part is fixedly connected to the top outer side of the positioning plate. The spacing between adjacent connecting ears is the same. Multiple connecting pins are provided and are configured to be detachably fixedly connected to the two connecting ears of each group, for synchronizing the rotational speed of the positioning disk and the rotor.

[0011] Preferably, the positioning disk is located inside the protective cover and is rotatably connected to the output end of the drive motor.

[0012] Preferably, the number and position of the connecting lugs fixedly connected to the rotor correspond to the slots on the rotor.

[0013] Preferably, the positioning hole is located at the bottom of one of the connecting lugs on the positioning plate.

[0014] Preferably, the auxiliary positioning element is a low-friction elastic material.

[0015] This invention provides a centrifuge mechanism with precise positioning. Compared with the prior art, it has the following advantages: 1. Through the cooperation of the positioning pin and the positioning hole, and the guiding effect of the auxiliary positioning component, even if the rotor shaft hole, main shaft or brake pad is worn and causes initial alignment deviation, the positioning plate and the rotor can still be accurately fixed. This solves the problem of positioning error caused by wear in the existing technology, avoids the trouble of repeatedly adjusting the rotor position after stopping the machine, and improves work efficiency.

[0016] 2. The synchronous connection structure of connecting ears and connecting pins ensures that the positioning disk and rotor speed are completely synchronized, and the positioning hole and rotor slot are correspondingly connected through the connecting ears. In the automated experimental line, the accuracy of the robotic arm when picking up and placing samples can be guaranteed, thereby solving the problem that positioning errors may cause the robotic arm to fail to pick up and place samples and trigger the shutdown of the entire process in the existing technology, and improving the stability of equipment operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the connection structure of the positioning disc, driving device, rotor and drive motor of this utility model.

[0019] Figure 3 This is a schematic diagram of the positioning disc, connecting ear, connecting pin and rotor connection structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the connection structure of the positioning disc, slide, transition surface, positioning hole, rotor and protective cover of this utility model.

[0021] Figure 5 This is a schematic diagram of the connection structure of the positioning disc, connecting ear, connecting pin, driving device and rotor of this utility model.

[0022] Figure 6 This utility model Figure 5 Enlarged structural diagram at point A in the middle.

[0023] Figure 7 This is a schematic diagram of the connection structure of the transition surface, positioning hole, connecting ear, positioning pin and auxiliary positioning component when the present invention is in operation.

[0024] The attached figures are labeled as follows: 10. Positioning plate; 11. Slide groove; 12. Transition surface; 13. Positioning hole; 14. Connecting ear; 15. Connecting pin; 16. Drive unit; 17. Positioning pin; 18. Auxiliary positioning component; 20. Rotor; 21. Drive motor; 22. Protective cover. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0026] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0027] Reference Figures 1-7 A centrifuge mechanism with precise positioning, comprising: The positioning disk 10 includes components. The positioning disk 10 can be made of high-strength alloy steel. Through appropriate heat treatment processes, this type of alloy steel can achieve high tensile strength and yield strength, capable of withstanding the large centrifugal force generated during centrifugal mechanism operation, ensuring the structural stability of the positioning disk 10. Simultaneously, its surface can be treated with carburizing, nitriding, etc., to form a hard surface layer, significantly improving wear resistance and reducing wear caused by long-term friction. Alternatively, it can be made of ceramic matrix composite material. Ceramics themselves have extremely high hardness and wear resistance, while ceramic matrix composite materials, by adding reinforcing phases such as fibers, compensate for the high brittleness of pure ceramics, giving them high strength. In the centrifugal mechanism, it can effectively resist friction between the positioning disk 10 and other components, extending its service life. A positioning hole 13, formed on and penetrating the positioning disk 10, is used for auxiliary positioning. The positioning hole 13, along with the matching positioning pin 17 and auxiliary positioning element 18, can be respectively configured as a conical groove and a cone. The diameter of the hole's inlet end is slightly larger than the diameter of the bottom block structure, and the diameter gradually decreases radially inward to match the size of the block structure. This shape can guide the block structure through the inclined inner wall. Even if there is a slight deviation in the initial alignment between the block structure and the hole, the position can be automatically corrected along the conical surface during insertion, achieving rapid alignment and insertion, thereby fixing the entire positioning disk 10 to ensure its positional accuracy. Also includes: The drive device 16 has its output end pointing vertically upward and rotates with the positioning plate 10. The drive device 16 can be a telescopic drive cylinder, such as a pneumatic cylinder, hydraulic cylinder, or electric push rod. Its output end can make linear telescopic movements in the vertical direction. Under the control of the control end (not shown) and the matching components of the pneumatic cylinder, hydraulic cylinder, or electric push rod (not shown), it works for a preset time. The positioning pin 17 is fixedly connected to the top of the output end of the drive device 16. Its size corresponds to the positioning hole 13. It is used to insert into the positioning hole 13 to fix the positioning plate 10. The material of the positioning pin 17 can be the same as that of the positioning plate 10.

[0028] Positioning disc 10 also includes: The slide groove 11 is formed at the bottom of the positioning plate 10, is annular, and has the same width as the positioning plate 10; The transition surface 12 is formed at the connection between the slide groove 11 and the positioning plate 10, so that the connection between the positioning plate 10 and the slide groove 11 is at an angle.

[0029] Polytetrafluoroethylene (PTFE) coatings, solid lubricants, etc., can be applied to the inner wall of the slide groove 11 and the transition surface 12 to reduce the friction on the inner wall of the slide groove 11 and the transition surface 12.

[0030] Also includes: The auxiliary positioning component 18 is fixedly connected to the positioning pin 17 on the side near the positioning hole 13; The rotor 20 has several slots on the top for inserting test tubes and is used to rotate to provide centrifugal force to the test tubes. The rotor 20 can be from brands such as Deborah Machinery or Beckman Coulter. The drive motor 21 is fixed to the bottom of the rotor 20, with its output end extending upwards and fixedly connected to the bottom of the rotor 20. The drive motor 21 can be a Siemens 1FT7 series servo motor. The 1FT7 motor is a compact synchronous motor suitable for high-performance applications. It is equipped with the latest encoder technology and works in conjunction with Siemens' fully digital drive and control system to achieve high-precision speed control and position positioning. It offers various cooling methods, including natural cooling, external cooling, or water cooling, to meet different working environment requirements. In some high-end centrifuge equipment with stringent requirements for speed stability and positioning accuracy, the 1FT7 motor performs exceptionally well, ensuring stable and precise rotation of the rotor 20 and meeting the stringent speed requirements during centrifugation. Alternatively, a Bosch Rexroth MSK synchronous servo motor can be used. The MSK series offers a wide power range, fine size gradations, high torque density, and a maximum torque of up to 495 Nm. This series provides two encoder models to meet different precision requirements and also includes optional accessories such as keyways and brakes, increasing concentricity and achieving an IP65 protection rating, allowing for use with fans and water cooling systems. If the centrifugal mechanism needs to cope with complex environments during operation, or has high requirements for motor torque, the MSK series motor can be an ideal choice for drive motor 21, providing stable and strong rotational power for rotor 20. The drive motor 21 is electrically connected to the control terminal (not shown) and is controlled by the control terminal.

[0031] The protective cover 22 is located on the outside of the rotor 20 and is fixedly connected to the drive motor 21 and rotatably connected to the output end of the drive motor 21; it is used to protect the rotor 20.

[0032] Also includes: The connecting ears 14 are provided in multiple sets, each set is divided into two parts, one part is fixedly connected to the bottom of the rotor 20, and the other part is fixedly connected to the top outer side of the positioning plate 10. The adjacent connecting ears 14 are spaced at the same interval. Multiple connecting pins 15 are provided and are configured to be detachably fixedly connected to two connecting ears 14 in each group for synchronizing the rotational speeds of the positioning disc 10 and the rotor 20.

[0033] By utilizing the rigid connection characteristics of the connecting pin 15, the rotational power of the rotor 20 is transmitted to the positioning disk 10. The force transmission is ensured to be uniform through the equally spaced connecting ears 14, so that the rotational speeds of the two are completely synchronized.

[0034] The positioning disk 10 is located inside the protective cover 22 and is rotatably connected to the output end of the drive motor 21, so that the positioning disk 10 can rotate on its own to adjust the angle of the positioning disk 10.

[0035] The number and position of the connecting ears 14 fixedly connected to the rotor 20 correspond to the slots of the rotor 20, ensuring that the rotor 20 has a stable center of gravity when carrying different numbers of test tubes, and avoiding vibration or speed fluctuations caused by uneven force.

[0036] The positioning hole 13 is located at the bottom of one of the connecting ears 14 on the positioning plate 10. The positioning hole 13 is associated with the position of the connecting ear 14, which simplifies the position recognition logic during positioning and improves the accuracy of the positioning pin 17 being inserted into the positioning hole 13.

[0037] The auxiliary positioning component 18 is a low-friction elastic material. It can be made of polytetrafluoroethylene (PTFE) modified elastomer. PTFE itself has an extremely low coefficient of friction. Combining it with an elastomer retains the flexibility and deformation capability of the elastomer while significantly reducing the surface friction coefficient through the PTFE component. This allows it to adapt to the slight friction and contact scenarios that may occur in the centrifugal mechanism, preventing excessive friction from affecting the component fitting accuracy. Alternatively, it can be made of silicone rubber with added graphite or molybdenum disulfide. Silicone rubber itself has good elasticity and temperature resistance. By adding solid lubricants such as graphite or molybdenum disulfide, its coefficient of friction can be significantly reduced. The modified silicone rubber maintains elasticity while improving surface lubricity, reducing resistance when in contact with other components. Furthermore, the shock-absorbing properties of silicone rubber can buffer slight vibrations during centrifugation, protecting the mating components.

[0038] When the auxiliary positioning component 18 moves upward and contacts the transition surface 12, it tilts along with the transition surface 12, so that the end of itself near the positioning hole 13 can directly enter the interior of the positioning hole 13, making it easy for the auxiliary positioning component 18 and the positioning pin 17 to quickly enter the positioning hole 13 to complete the fixing of the positioning plate 10.

[0039] Working Process and Principle: When this centrifuge mechanism with precise positioning is working, the drive motor 21 drives the rotor 20 to rotate to generate centrifugal force, and the protective cover 22 provides protection on the outside. The positioning disk 10 is connected to the rotor 20 through the connecting lug 14 and the connecting pin 15 to achieve synchronous rotation speed. The groove 11 at the bottom of the positioning disk 10 is annular and has the same width as the positioning disk 10. The transition surface 12 at the connection between the groove 11 and the positioning disk 10 forms an angle to reduce friction. When precise positioning is required, the drive device 16 drives the top positioning pin 17 to rise, and the positioning pin 17 is inserted into the positioning hole 13 on the positioning disk 10. The positioning hole 13 guides the precise fixation. The auxiliary positioning component 18 uses a low-friction elastic material to assist in the fit, ensuring the stability and accuracy of the positioning disk 10 and the rotor 20 during operation and positioning. The position of the positioning hole 13 corresponds to the connecting lug 14, and the number and position of the connecting lug 14 on the rotor 20 correspond to the test tube slots, further ensuring the overall fit accuracy.

[0040] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A centrifuge mechanism with precise positioning, characterized in that, include: Positioning disk (10), the positioning disk (10) comprising: A positioning hole (13) is formed on the positioning disk (10) and extends through the positioning disk (10) to assist in positioning; Also includes: The drive device (16) has its output end pointing vertically upward and rotates following the positioning disk (10); The positioning pin (17) is fixedly connected to the top of the output end of the drive device (16), and its size corresponds to the positioning hole (13). It is used to insert into the positioning hole (13) to fix the positioning plate (10).

2. The centrifuge mechanism with precise positioning according to claim 1, characterized in that, The positioning disk (10) also includes: A groove (11) is formed at the bottom of the positioning disk (10), and is annular, with the same width as the positioning disk (10); A transition surface (12) is formed at the connection between the slide groove (11) and the positioning disk (10), so that the connection between the positioning disk (10) and the slide groove (11) is at an angle.

3. The centrifuge mechanism with precise positioning according to claim 1, characterized in that, Also includes: An auxiliary positioning component (18) is fixedly connected to the positioning pin (17) on the side near the positioning hole (13); The rotor (20) has several slots on its top for inserting test tubes, and is used to rotate to provide centrifugal force to the test tubes; A drive motor (21) is fixed to the bottom of the rotor (20), and its output end extends upward and is fixedly connected to the bottom of the rotor (20); A protective cover (22) is disposed on the outside of the rotor (20) and fixedly connected to the drive motor (21), and rotatably connected to the output end of the drive motor (21); it is used to protect the rotor (20).

4. A centrifuge mechanism with precise positioning according to claim 3, characterized in that, Also includes: The connecting ears (14) are provided in multiple sets, each set is divided into two parts, one part is fixedly connected to the bottom of the rotor (20), and the other part is fixedly connected to the top outer side of the positioning disk (10), with adjacent connecting ears (14) spaced at the same interval; Multiple connecting pins (15) are provided and are configured to be detachably fixedly connected to the two connecting ears (14) of each group for synchronizing the rotational speed of the positioning disk (10) and the rotor (20).

5. A centrifuge mechanism with precise positioning according to claim 3, characterized in that, The positioning disk (10) is located inside the protective cover (22) and is rotatably connected to the output end of the drive motor (21).

6. A centrifuge mechanism with precise positioning according to claim 4, characterized in that, The number and position of the connecting ears (14) fixedly connected to the rotor (20) correspond to the slots of the rotor (20).

7. A centrifuge mechanism with precise positioning according to claim 4, characterized in that, The positioning hole (13) is located at the bottom of one of the connecting lugs (14) on the positioning disk (10).

8. A centrifuge mechanism with precise positioning according to claim 3, characterized in that, The auxiliary positioning element (18) is made of a low-friction elastic material.

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