Self-balancing sample centrifugal machine
By setting the balance ring and limit pin in the centrifuge, the jitter problem caused by uneven feeding of the centrifuge is solved, and a more stable and efficient centrifugal process is achieved to ensure the accuracy of the results and machine life.
Patent Information
- Application Number
- CN202422294932.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-19
AI Technical Summary
Existing centrifuges are prone to jitter when the feeding is uneven, which affects the separation effect and machine life, especially when the blood is centrifuged, the unbalanced jitter affects the analysis results.
The balance ring is set up in the centrifuge to fill the balance liquid, and the inertia and viscous friction of the balance liquid are used to offset the unbalanced force, and the stop limit pins are combined to ensure the accurate positioning of the hanging basket to achieve self-balancing.
Improve the stability and separation accuracy of the centrifuge, protect the machine structure, reduce wear, and improve work efficiency and result accuracy.
Smart Images
Figure CN223171079U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a self-balancing sample centrifuge, belonging to the technical field of centrifuges. Background Art
[0002] A centrifuge is a machine that uses centrifugal force to separate the components in a mixture of liquid and solid particles or liquid and liquid. Centrifuges are mainly used to separate solid particles from a suspension from the liquid, or to separate two immiscible liquids with different densities in an emulsion (for example, to separate cream from milk); it can also be used to remove the liquid from wet solids, such as wringing wet clothes in a washing machine; special ultra-high-speed tubular separators can also separate gas mixtures with different densities; taking advantage of the fact that solid particles with different densities or particle sizes settle at different speeds in a liquid, some sedimentation centrifuges can also classify solid particles according to density or particle size.
[0003] Before the centrifuge works, it is necessary to feed materials into the machine body, but the fed materials cannot be evenly distributed inside the centrifuge, resulting in excessive shaking due to uneven materials during the initial separation operation stage of the centrifuge, which will cause wear to the centrifuge; especially when centrifuging blood, there will be differences in the amount of blood collected each time, and the unbalanced shaking during centrifugation will affect the separation of blood, which will affect the subsequent analysis and test results. Content of the Utility Model
[0004] The purpose of the utility model is to provide a balanced sample centrifuge to solve the technical problems existing in the prior art as described above.
[0005] The technical solution provided by the utility model is as follows: A self-balancing sample centrifuge, including a machine shell, a machine cover and a rotating shaft. A rotating bracket is arranged on the rotating shaft, a hanging basket is arranged on the rotating bracket, the hanging basket is used for loading sample carriers, a balancing ring is arranged inside the machine shell, and a balancing liquid is filled in the inner cavity of the balancing ring.
[0006] The effect of adopting the above technical solution is that, when the centrifuge is centrifuged, the imbalance problem is generally solved by counterweights, and relatively large weight differences can be adjusted by counterweights at corresponding positions. However, when centrifuging sample carriers with little weight difference such as blood samples, this imbalance cannot be adjusted by counterweights; when the centrifuge is running, if the load distribution in the centrifuge is uneven, an unbalanced force will be generated. This unbalanced force will manifest as eccentricity or shaking of the centrifuge during rotation, resulting in instability of the machine. This imbalance will not only affect the efficiency of centrifugation, but may also cause damage to the centrifuge itself; the utility model provides a balance ring in the casing, and the inner cavity of the balance ring is filled with a balance liquid. When the centrifuge is running, the balance liquid will be affected by the centrifugal force and tend to move in the direction of the centrifugal force. When the centrifuge is unbalanced, the balance liquid will move due to inertia. The balancing fluid will lag behind the rotation of the centrifuge and continue to remain near its original position for a period of time instead of immediately deviating to the unbalanced direction with the centrifuge. The reason for this lag is the viscous friction between the balancing fluid and the balance ring. As a result, the position of the balancing fluid will produce a lag angle relative to the balance ring. The result of this lag is that the mass distribution of the balancing fluid forms a reverse torque relative to the balance ring. The direction of this reverse torque is opposite to the direction of the unbalanced force of the centrifuge, thereby offsetting part or all of the unbalanced force. The role of the reverse torque is to offset the unbalanced force of the centrifuge and reduce the vibration and eccentricity of the centrifuge. In this way, the centrifuge can return to a balanced state more quickly, avoiding long-term vibration or unstable operation. It can not only improve the accuracy of the centrifugal process, but also protect the mechanical structure of the centrifuge and extend its service life.
[0007] On the basis of the above technical solution, the present invention can also be improved as follows:
[0008] Furthermore, the machine cover includes an upper machine cover and a lower machine cover, the upper machine cover is fixedly connected to the upper end of the machine casing, the upper machine cover is provided with a first loading port, and the lower machine cover is provided with a second loading port.
[0009] Furthermore, the lower cover is gear-shaped, and a gear 1 is provided on the housing. The gear 1 is driven by a motor 1, and the gear 1 is meshed with the lower cover.
[0010] Furthermore, the loading port 1 and the two loading ports 2 can correspond to each other and can correspond to each of the hanging baskets.
[0011] Furthermore, the hanging basket is used to load a sample rack, and the sample rack is adapted to the sample carrier.
[0012] Furthermore, the sample carrier includes a test tube and a microplate.
[0013] Furthermore, when the sample carrier is a test tube, a capping rack is provided on the sample rack, and the capping rack can remove the cap of the sample carrier.
[0014] The effect of adopting the above-mentioned further scheme is that the traditional practice is to take out the sample carrier after centrifugation and remove the cap on another decapping device, or remove the cap manually; this scheme can remove the cap of the sample carrier while centrifuging on the centrifuge, completing two tasks at one time, greatly improving work efficiency.
[0015] Furthermore, the balance ring is arranged on the outer periphery of the rotating bracket.
[0016] Furthermore, the horizontal position of the balance ring is lower than that of the hanging basket.
[0017] The effect of adopting the above-mentioned further solution is that the balance ring is lower than the hanging basket relative to the balance ring being parallel to the hanging basket, and the center of gravity of the centrifuge is moved downward, which can further improve the overall stability of the centrifuge, especially when running at high speed, and can reduce the shaking of the machine; because the center of gravity is close to the rotation axis, the vibration risk of the top part is reduced, which helps to suppress the rising trend of the unbalanced force; because the balance ring is far away from the sample and the imbalance source, the balancing liquid is more inclined to lag, further amplifying the effect of the reverse torque, which is conducive to maintaining the balance of the centrifuge.
[0018] Furthermore, a stop pin is provided on the inner bottom of the casing, and the stop pin is used to lock the hanging basket.
[0019] The effect of adopting the above-mentioned further scheme is that before rotating the rotating shaft and the rotating bracket, the stop limit pin falls, and after the hanging basket rotates into position, the stop limit pin extends to lock and accurately position the hanging basket, which can prevent the hanging basket from position deviation caused by factors such as shaking or inaccurate stop rotation position.
[0020] Furthermore, the stop limit pin is controlled by motor 2, and motor 2 drives the stop limit pin to stop or release the hanging basket.
[0021] Furthermore, the second motor is arranged below the stop limit pin.
[0022] Furthermore, the balancing liquid is a liquid with poor fluidity and a certain viscosity, and the balancing liquid occupies 50-70% of the volume of the inner cavity of the balancing ring.
[0023] The effect of adopting the above further solution is that selecting a balancing liquid with poor fluidity and a certain viscosity can increase the friction between the balancing ring and produce a stronger damping effect, thereby quickly offsetting the unbalanced force of the centrifuge and making the centrifuge reach balance.
[0024] The technical solution provided by the present utility model has the following beneficial effects compared with the prior art:
[0025] By arranging a balance ring with balance liquid inside, when the centrifuge is unbalanced, the balance ring will tilt in a certain direction. Due to the fluidity and inertia of the balance liquid, it tends to maintain its original balanced position. As a result, relative friction is generated between the balance liquid and the balance ring. This frictional force is opposite to the unbalanced force of the centrifuge, which can partially offset the unbalanced force during the centrifugation process, thus playing an auxiliary balancing role and ensuring the stable operation of the centrifuge. And by arranging a stop limit pin, the position of the hanging basket can be accurately positioned to avoid position deviation, thereby reducing the shaking after centrifugation stops, ensuring the accuracy of the centrifugation results, as well as the accuracy of the loading and unloading positions of the sample carrier during automated integration. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model Figure 1 ;
[0027] Figure 2 is a schematic structural diagram of Embodiment 1 of the present utility model Figure 2 ;
[0028] Figure 3 is Figure 2 an enlarged view of part A of
[0029] Figure 4 is a cross-sectional view of Embodiment 1 of the present utility model
[0030] Figure 5 is a schematic diagram of the engagement of Gear 1 and the lower machine cover in Embodiment 1 of the present utility model
[0031] Figure 6 is a schematic structural diagram of Embodiment 2 of the present utility model
[0032] In the figure, 1. machine shell; 2. upper machine cover; 3. rotating shaft; 4. rotating bracket; 5. hanging basket; 6. balance ring; 7. loading port 1; 8. sample sleeve rack; 9. cap removal rack; 10. sample carrier; 11. stop limit pin; 12. motor 2; 13. Gear 1; 14. lower machine cover; 15. loading port 2. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] The principles and features of the present utility model will be described below in conjunction with examples. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.
[0034] Embodiment 1
[0035] As Figures 1 - 5As shown in the figure, a self-balancing sample centrifuge includes a housing 1, a machine cover, and a rotating shaft 3. A rotating bracket 4 is provided on the rotating shaft 3. Six hanging baskets 5 are rotatably provided on the rotating bracket 4. The hanging baskets 5 are used to load sample carriers 10, and the hanging baskets 5 can rotate 0-90° relative to the rotating bracket 4 under the action of centrifugal force. A balance ring 6 is provided inside the housing 1, and the balance ring 6 is connected to the outer periphery of the rotating bracket 4. The inner cavity of the balance ring 6 is filled with a balance liquid. During centrifugation, the relative rotational force generated by the friction between the balance liquid in the balance ring 6 and the balance ring 6 acts in the opposite direction to the unbalanced force of the centrifuge, so that the weight difference of the samples in the sample carrier 10 can be adjusted, and micro-balancing during centrifugation can be achieved, thereby reducing the jitter and wear of the centrifuge. The machine cover includes an upper machine cover 2 and a lower machine cover 14. The upper machine cover 2 is fixedly connected to the upper end of the housing 1. A loading port 1 7 is provided on the upper machine cover 2. Two symmetrically arranged loading ports 2 15 are provided on the lower machine cover 14. The lower machine cover 14 is in the shape of a gear. A gear 1 13 is provided on the housing 1. The gear 1 13 is driven by a motor 1. The gear 1 13 meshes with the lower machine cover 14. When the gear 1 13 rotates, it drives the lower machine cover 14 to rotate, so that the loading port 1 7 is temporarily closed or opened. A sample holder 8 is loaded in the hanging basket 5. The sample holder 8 can accommodate at most eight sample carriers 10. The sample holder 8 is adapted to the sample carrier 10. The sample carrier 10 is a test tube. During centrifugation, the hanging basket 5 rotates around the axis under the action of centrifugal force and is in an approximately horizontal state. The sample holder 8 can ensure the fixation of the sample carrier 10 and prevent sample leakage. A de-capping rack 9 is provided on the sample holder 8. The de-capping rack 9 can de-cap the sample carrier 10. The de-capping rack 9 is a disposable consumable. After centrifugation is completed, the de-capping rack 9 can be discarded together with the sample carrier cap, reducing the operation of manually removing and discarding, and improving work efficiency. A stop limit pin 11 is provided at the inner bottom of the housing 1. The stop limit pin 11 is used to lock the hanging basket 5. The stop limit pin 11 is controlled by a motor 2 12. The shaft of the motor 2 12 drives the stop limit pin 11 to stop or release the stop of the hanging basket 5 through up and down telescoping. The motor 2 12 is provided below the stop limit pin 11. Setting the stop limit pin 11 to lock and accurately position the hanging basket 5 can prevent the position deviation of the hanging basket 5 caused by factors such as shaking or inaccurate stopping rotation position, facilitating accurate positioning during loading and unloading, which is particularly important for automatic loading and unloading.
[0036] When the present invention is working, firstly, the sample carrier 10 is loaded on the sample rack 8, then the gear 13 is started to drive the lower cover 14 to rotate, so that the loading port 17 corresponds to the loading port 2 15, and the sample rack 8 is loaded on the corresponding hanging basket 5, and the gear 13 is started again to drive the lower cover 14 to rotate, so that the loading port 17 is temporarily closed to ensure the safety of the operation, and then the rotating shaft 3 and the rotating bracket 4 are rotated to rotate the next symmetrical empty hanging basket 5 to the loading port 17, and the gear 13 is started again to drive the lower cover 14 to rotate to the open position, and the sample rack 8 is loaded on the corresponding hanging basket 5. When the sample to be centrifuged is When there are a large number of carriers 10, the gear 13 and the lower cover 14 can be repeatedly rotated to temporarily close or open the loading port 17, and the rotating shaft 3 and the rotating bracket 4 can be rotated to load more sample racks 8 loaded with sample carriers 10 that need to be centrifuged. Counterweights can also be added according to the actual number of samples, and then the centrifugation parameters are set for centrifugation. After the centrifugation is completed, the shaft of the motor 2 12 extends to drive the stop limit pin 11 to stop and position the hanging basket 5, and then the cover of the centrifuge is opened, the cap removal rack 9 and the sample carrier cap are taken out and discarded as biological waste, and then the centrifuged sample rack 8 is taken out, and the centrifugation work is completed.
[0037] The utility model reduces the shaking problem caused by the difference in sample weight during the centrifugation process by arranging a balance ring 6 in the sample centrifuge, and reduces the shaking of the hanging basket 5 after the centrifugation stops by arranging a stop limit pin 11, thereby avoiding wear on the centrifuge and ensuring the accuracy of the centrifugation results.
[0038] Example 2
[0039] Reference Figure 6 The difference from Example 1 is that the sample carrier 10 is a microplate, and two hanging baskets 5 are provided in the centrifuge for loading the microplate.
[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.
Claims
1. A self-balancing sample centrifuge, comprising a housing (1), a machine cover and a rotating shaft (3), characterized in that, A rotating bracket (4) is provided on the rotating shaft (3), a hanging basket (5) is provided on the rotating bracket (4), the hanging basket (5) is used for loading a sample carrier (10), a balance ring (6) is provided in the machine housing (1), and a balance liquid is filled in the inner cavity of the balance ring (6).
2. The self-balancing sample centrifuge according to claim 1, characterized in that, The machine cover includes an upper machine cover (2) and a lower machine cover (14), the upper machine cover (2) is connected to the upper end of the machine housing (1), a first loading port (7) is provided on the upper machine cover (2), and a second loading port (15) is provided on the lower machine cover (14).
3. The self-balancing sample centrifuge according to claim 2, wherein, The lower machine cover (14) is in a gear shape, a first gear (13) is provided on the machine housing (1), the first gear (13) is driven by a first motor, and the first gear (13) meshes with the lower machine cover (14).
4. The self-balancing sample centrifuge according to claim 2, wherein, The first loading port (7) and the second loading port (15) can correspond to each other and can correspond to each hanging basket (5).
5. The self-balancing sample centrifuge according to claim 1, wherein, The hanging basket (5) is used for loading a sample sleeve (8), and the sample sleeve (8) is adapted to the sample carrier (10).
6. The self-balancing sample centrifuge according to claim 5, wherein The sample carrier (10) includes a test tube and a microplate.
7. The self-balancing sample centrifuge according to claim 1, characterized in that, The balance ring (6) is provided on the outer periphery of the rotating bracket (4).
8. The self-balancing sample centrifuge according to claim 1, wherein A stop limit pin (11) is provided at the inner bottom of the machine housing (1), and the stop limit pin (11) is used for locking the hanging basket (5).
9. The self-balancing sample centrifuge according to claim 8, wherein The stop limit pin (11) is controlled by a second motor (12), and the second motor (12) drives the stop limit pin (11) to position or release the positioning of the hanging basket (5).
10. The self-balancing sample centrifuge according to claim 9, characterized in that, The balance liquid accounts for 50 - 70% of the volume of the inner cavity of the balance ring (6).