A centrifuge with automatic balancing rotor structure and use method thereof

Abstract

The present invention relates to the technical field of centrifuges, specifically to a centrifuge with an automatic balancing rotor structure and a method for using the centrifuge, comprising a frame of a plate-like structure, a mounting hole being provided through the frame, a motor being fixedly provided on the inner side of the mounting hole, the output shaft of the motor being coaxially connected to a vertically installed main shaft, the top of the main shaft being connected to a cylindrical rotor, a notch being provided through the inner bottom surface of the rotor and along the radial direction of the rotor, a U-shaped retaining frame being provided on the inner bottom surface of the rotor and located outside the notch, a cylindrical centrifugal bucket being provided inside the retaining frame for holding centrifuge tubes. The rotor of the present invention is provided with a flexibly movable balancing block, and when centrifuge tubes containing liquids of different masses are placed in the rotor, the balancing block can be adjusted to keep the rotor stable, and compared with the traditional technology, the present invention omits the step of manual balancing, which helps to improve the efficiency of centrifugal work.

Description

Technical Field

[0001] The invention relates to the technical field of centrifuges, and in particular to a centrifuge with an automatic balancing rotor structure and a use method thereof. Background Art

[0002] At present, the separation of liquid substances used in the chemical or biological fields requires the use of a special centrifuge. One of the most serious problems of existing centrifuges is the vibration of the centrifuge caused by unbalanced load. Severe unbalanced vibration is not only easy to cause poor centrifugal quality, but may even cause centrifugal failure. One of the reasons for imbalance is that the liquids in each container separated by the centrifuge are not necessarily of equal quality. Another reason is that the mass distribution of the centrifuge rotor itself is uneven. The existing solution is to strictly balance the centrifuge rotor manually before the centrifugal operation. The specific operation is to evenly place centrifuge tubes on the centrifuge rotor and add an equal amount of liquid sample to the centrifuge tube. If the liquid sample is limited, other liquids such as water are selected as substitutes. The accuracy of manual balancing is determined by the operator's experience and the accuracy of the measuring cup / dropper or balance used. This balancing method is not only troublesome, but also inefficient, which seriously affects the operator's use of the centrifuge. To this end, we propose a centrifuge with an automatic balancing rotor structure and a method for using it to solve the above-mentioned drawbacks. Summary of the invention

[0003] The object of the present invention is to provide a centrifuge with an automatic balancing rotor structure and a method of using the same, which solves the problem that the rotor is not easy to balance by arranging a flexibly movable balancing block inside the rotor.

[0004] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0005] A centrifuge with an automatic balancing rotor structure, comprising a frame of a plate-like structure, a mounting hole is formed through the frame, a motor is fixedly arranged inside the mounting hole, an output shaft of the motor is coaxially connected to a main shaft installed vertically, a cylindrical rotor is connected to the top of the main shaft, a notch is formed through the inner bottom surface of the rotor and along the radial direction of the rotor, a U-shaped retainer is provided on the inner bottom surface of the rotor and outside the notch, a cylindrical centrifugal bucket is provided inside the retainer for holding a centrifugal tube, the top of the centrifugal bucket is rotatably matched with the inner side wall of the retainer, and the bottom of the centrifugal bucket passes through the notch and extends to the bottom of the rotor;

[0006] The inner bottom surface of the rotor is provided with a linear slide distributed along the radial direction of the rotor, the linear slide and the notch are located on the same straight line, and a moving block is slidably connected to the linear slide, and a transmission mechanism with a retractable length is rotatably connected to both side walls of the moving block, and an arc groove is opened on the inner bottom surface of the rotor along the outer circumference, and two balancing blocks are slidably matched inside the arc groove, the two balancing blocks are symmetrically distributed about the linear slide, and the two balancing blocks are respectively rotatably connected to one end of the two groups of transmission mechanisms away from the moving block; the inner bottom surface of the rotor is also provided with a balancing actuator for driving the moving block to slide along the linear slide, and the bottom surface of the rotor is provided with a vibration sensor and a controller, the signal output end of the vibration sensor is electrically connected to the signal input end of the controller, and the signal output end of the controller is electrically connected to the signal input end of the balancing actuator.

[0007] Preferably, the transmission mechanism includes a first connecting rod, a second connecting rod and a transmission swing arm, the two ends of the first connecting rod are respectively rotatably connected to the moving block and the transmission swing arm, the two ends of the second connecting rod are respectively rotatably connected to the balancing block and an end of the transmission swing arm away from the first connecting rod, the transmission swing arm is in an "L" shape, and the corner position of the transmission swing arm is rotationally matched through the pin shaft and the inner bottom surface of the rotor.

[0008] Preferably, the balancing actuator is a hydraulic actuator, a pneumatic actuator or an electric actuator.

[0009] Preferably, the vibration sensor is a moving coil electric sensor.

[0010] Preferably, a cover body is fixedly provided on the top surface of the rotor, and a taking-in and putting-out opening corresponding to the retaining frame is formed through the cover body.

[0011] Preferably, a cylindrical mounting seat is fixedly provided in the mounting hole, a disc is fixedly provided on the top surface of the mounting seat, the diameter of the disc is larger than the diameter of the mounting seat, and a plurality of buffer springs are evenly distributed on the bottom surface of the disc along the outer circumference, and the bottom ends of the buffer springs are connected to the top surface of the frame; the motor is fixedly provided on the bottom surface of the mounting seat, and the bottom end of the main shaft passes through the disc and the mounting seat and is connected to the output shaft of the motor through a coupling.

[0012] Preferably, the outer fixing sleeve of the mounting seat is provided with a clamp, and the clamp is connected to the frame.

[0013] Preferably, a plurality of groups of bearings are provided on the inner side of the mounting seat, the outer rings of the bearings are fixedly connected to the mounting seat, and the inner rings of the bearings are fixedly sleeved on the main shaft.

[0014] On the other hand, the present invention also provides the following technical solution: a method for using a centrifuge with an automatic balancing rotor structure, comprising the following steps:

[0015] S1: Place a centrifuge tube containing the sample to be separated into the centrifuge bucket;

[0016] S2: Turn on the motor, and the motor drives the rotor to start accelerating rotation through the main shaft;

[0017] S3: During the rotation of the rotor, since the center of mass of the rotor is not on the rotation axis, the rotor will rotate eccentrically, and as the rotation speed gradually increases, the degree of deviation of the rotor will also gradually increase. At this time, the vibration sensor will generate a vibration signal and transmit the vibration signal to the controller;

[0018] S4: After receiving the vibration signal, the controller will automatically generate a leveling plan and control the balancing actuator to make corresponding actions, so that the balancing block slides along the arc groove, thereby gradually balancing the rotor;

[0019] S5: The speed of the rotor increases continuously and reaches the target speed, and finally the separation of the sample is completed. After the sample separation is completed, the motor is turned off and the centrifuge tube is taken out from the access port.

[0020] Compared with the prior art, the present invention provides a centrifuge with an automatic balancing rotor structure and a method for using the same, which has the following beneficial effects:

[0021] 1. The rotor of the present invention is provided with a flexibly movable balancing block. When centrifuge tubes containing liquids of different masses are placed in the rotor, the rotor can be kept stable by adjusting the balancing block. Compared with the traditional technology, the present invention saves the step of manual balancing, which helps to improve the efficiency of centrifugal work;

[0022] 2. The present invention has a take-in and put-out opening on the cover body, through which the centrifuge tube can be directly taken out or put into the centrifuge bucket, which is simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the state after the cover of the present invention is opened;

[0025] Figure 3 It is a top view of the state after the cover of the present invention is uncovered;

[0026] Figure 4 for Figure 3 Sectional view at AA;

[0027] Figure 5 for Figure 3 Cross-sectional view at BB in the middle.

[0028] In the figure: 1. frame; 2. motor; 3. main shaft; 4. rotor; 5. retaining frame; 6. centrifugal bucket; 7. linear slide; 8. arc groove; 9. moving block; 10. transmission mechanism; 101. first connecting rod; 102. second connecting rod; 103. transmission swing arm; 11. balancing block; 12. balancing actuator; 13. cover; 14. access port; 15. mounting seat; 16. disc; 17. buffer spring; 18. clamp; 19. bearing; 20. vibration sensor; 21. controller. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example: See Figure 1 — Figure 5 A centrifuge with an automatic balancing rotor structure comprises a frame 1 of a plate-like structure, a mounting hole is formed through the frame 1, a motor 2 is fixedly arranged on the inner side of the mounting hole, a cylindrical mounting seat 15 is fixedly arranged in the mounting hole, a clamp 18 is fixedly sleeved on the outer side of the mounting seat 15, and the clamp 18 is connected to the frame 1, wherein the motor 2 is fixedly arranged on the bottom surface of the mounting seat 15; the output shaft of the motor 2 is coaxially connected to a main shaft 3 installed vertically, the top end of the main shaft 3 is connected to a cylindrical rotor 4, the inner bottom surface of the rotor 4 and along the radial direction of the rotor 4 A notch is provided through the rotor 4, and a U-shaped retaining frame 5 is provided on the inner bottom surface of the rotor 4 and on the outer side of the notch. The retaining frame 5 and the rotor 4 are integrally formed. A cylindrical centrifugal bucket 6 is provided inside the retaining frame 5 for holding the centrifuge tube, and the top of the centrifugal bucket 6 is rotatably matched with the inner side wall of the retaining frame 5, and the bottom of the centrifugal bucket 6 passes through the notch and extends to the bottom of the rotor 4. Short shafts are symmetrically provided on both sides of the outside of the centrifugal bucket 6, and the short shafts are rotatably matched with the side walls of the retaining frame 5. Therefore, when the centrifuge tube is placed in the centrifugal bucket 6, the centrifugal bucket 6 can swing around the short shaft.

[0031] The inner bottom surface of the rotor 4 is provided with a linear slide 7 distributed along the radial direction of the rotor 4, the linear slide 7 and the notch are located on the same straight line, and a moving block 9 is slidably connected to the linear slide 7, that is, the moving block 9 can slide along the linear slide 7, and the two side walls of the moving block 9 are rotatably connected with a transmission mechanism 10 with a retractable length. The inner bottom surface of the rotor 4 is provided with an arc groove 8 along the outer circumference, and two balancing blocks 11 are slidably matched inside the arc groove 8, that is, the balancing block 11 can slide along the arc groove 8, and the two balancing blocks The blocks 11 are symmetrically distributed about the linear slide 7, and the two balancing blocks 11 are respectively rotatably connected to one end of the two transmission mechanisms 10 away from the moving block 9; the transmission mechanism 10 includes a first connecting rod 101, a second connecting rod 102 and a transmission swing arm 103, the two ends of the first connecting rod 101 are respectively rotatably connected to the moving block 9 and the transmission swing arm 103, the two ends of the second connecting rod 102 are respectively rotatably connected to the balancing block 11 and the transmission swing arm 103 away from the first connecting rod 101, and the transmission swing arm 103 is in an "L" shape. The corner position of the movable swing arm 103 is rotated and matched with the inner bottom surface of the rotor 4 through the pin shaft, so when the moving block 9 slides along the straight slide 7, the position of the balancing block 11 in the arc groove 8 can be adjusted; the inner bottom surface of the rotor 4 is also provided with a balancing actuator 12 for driving the moving block 9 to slide along the straight slide 7, and the bottom surface of the rotor 4 is provided with a vibration sensor 20 and a controller 21, the signal output end of the vibration sensor 20 is electrically connected to the signal input end of the controller 21, and the signal output end of the controller 21 is electrically connected to the signal input end of the balancing actuator 12, wherein the balancing actuator 12 selects a hydraulic actuator, a pneumatic actuator or an electric actuator, and the vibration sensor 20 selects a moving coil electric sensor, when the rotor 4 vibrates during the rotation process, the vibration sensor 20 generates a vibration signal and transmits the vibration signal to the controller 21, and the controller 21 controls the balancing actuator 12 to perform a corresponding action, thereby making the center of mass of the rotor 4 as a whole on the rotating axis of the rotor 4, so that the rotor 4 can rotate smoothly.

[0032] A cover 13 is fixedly provided on the top surface of the rotor 4 , and a take-in and put-out opening 14 corresponding to the retaining frame 5 is formed through the cover 13 , so that operators can take and put the centrifuge tubes conveniently.

[0033] A disc 16 is fixedly provided on the top surface of the mounting seat 15 . The diameter of the disc 16 is larger than the diameter of the mounting seat 15 . A plurality of buffer springs 17 are evenly distributed on the bottom surface of the disc 16 along the outer circumference. The bottom ends of the buffer springs 17 are connected to the top surface of the frame 1 .

[0034] The bottom end of the main shaft 3 passes through the disc 16 and the mounting seat 15 and is connected to the output shaft of the motor 2 through a coupling. A plurality of bearings 19 are provided on the inner side of the mounting seat 15. The outer ring of the bearing 19 is fixedly connected to the mounting seat 15, and the inner ring of the bearing 19 is fixedly sleeved on the main shaft 3.

[0035] A method for using a centrifuge with an automatic balancing rotor structure comprises the following steps:

[0036] S1: placing a centrifuge tube containing a sample to be separated into a centrifuge bucket 6;

[0037] S2: Turn on the motor 2, and the motor 2 drives the rotor 4 through the main shaft 3 to start accelerating the rotation;

[0038] S3: During the rotation of the rotor 4, since the center of mass of the rotor 4 is not on the rotation axis, the rotor 4 will rotate eccentrically, and as the rotation speed gradually increases, the degree of deviation of the rotor 4 will also gradually increase. At this time, the vibration sensor 20 will generate a vibration signal and transmit the vibration signal to the controller 21;

[0039] S4: After receiving the vibration signal, the controller 21 will automatically generate a leveling scheme and control the balancing actuator 12 to make corresponding actions, so that the balancing block 11 slides along the arc groove 8, thereby gradually balancing the rotor 4;

[0040] S5: The rotation speed of the rotor 4 increases continuously and reaches the target rotation speed, and finally the separation of the sample is completed. After the sample separation is completed, the motor 2 is turned off, and the centrifuge tube is taken out from the access port 14.

[0041] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifuge with an automatic balancing rotor structure, comprising a frame (1) with a plate-like structure, characterized in that: The frame (1) is provided with a mounting hole, an electric motor (2) is fixedly arranged inside the mounting hole, an output shaft of the electric motor (2) is coaxially connected to a main shaft (3) installed vertically, a top end of the main shaft (3) is connected to a cylindrical rotor (4), a notch is provided on the inner bottom surface of the rotor (4) and along the radial direction of the rotor (4), a U-shaped retaining frame (5) is provided on the inner bottom surface of the rotor (4) and outside the notch, a cylindrical centrifugal bucket (6) is provided inside the retaining frame (5) for containing centrifugal tubes, the top of the centrifugal bucket (6) is rotatably matched with the inner side wall of the retaining frame (5), and the bottom of the centrifugal bucket (6) passes through the notch and extends to the bottom of the rotor (4); The inner bottom surface of the rotor (4) is provided with a linear slideway (7) distributed along the radial direction of the rotor (4), the linear slideway (7) and the notch are located on the same straight line, and a moving block (9) is slidably connected to the linear slideway (7), and a transmission mechanism (10) with a retractable length is rotatably connected to both side walls of the moving block (9), and an arc groove (8) is opened on the inner bottom surface of the rotor (4) along the outer circumferential direction, and two balancing blocks (11) are slidably matched inside the arc groove (8), and the two balancing blocks (11) are symmetrically distributed about the linear slideway (7). , and the two balancing blocks (11) are respectively rotatably connected to one end of the two transmission mechanisms (10) away from the moving block (9); the inner bottom surface of the rotor (4) is also provided with a balancing actuator (12) for driving the moving block (9) to slide along the linear slideway (7); the bottom surface of the rotor (4) is provided with a vibration sensor (20) and a controller (21); the signal output end of the vibration sensor (20) is electrically connected to the signal input end of the controller (21), and the signal output end of the controller (21) is electrically connected to the signal input end of the balancing actuator (12).

2. A centrifuge with an automatic balancing rotor structure according to claim 1, characterized in that: The transmission mechanism (10) comprises a first connecting rod (101), a second connecting rod (102) and a transmission swing arm (103); the two ends of the first connecting rod (101) are respectively rotatably connected to a moving block (9) and the transmission swing arm (103); the two ends of the second connecting rod (102) are respectively rotatably connected to a balancing block (11) and an end of the transmission swing arm (103) away from the first connecting rod (101); the transmission swing arm (103) is in an "L" shape; the corner position of the transmission swing arm (103) is rotatably matched through a pin shaft and the inner bottom surface of a rotor (4).

3. The centrifuge with an automatic balancing rotor structure according to claim 1, characterized in that: The balancing actuator (12) is a hydraulic actuator, a pneumatic actuator or an electric actuator.

4. The centrifuge with an automatic balancing rotor structure according to claim 1, characterized in that: The vibration sensor (20) is a moving coil type electric sensor.

5. The centrifuge with an automatic balancing rotor structure according to claim 1, characterized in that: A cover body (13) is fixedly provided on the top surface of the rotor (4), and a take-in and put-out opening (14) corresponding to the retaining frame (5) is formed through the cover body (13).

6. The centrifuge with an automatic balancing rotor structure according to claim 1, characterized in that: A cylindrical mounting seat (15) is fixedly arranged in the mounting hole, a disc (16) is fixedly arranged on the top surface of the mounting seat (15), the diameter of the disc (16) is larger than the diameter of the mounting seat (15), and a plurality of buffer springs (17) are evenly distributed on the bottom surface of the disc (16) along the outer circumference, and the bottom ends of the buffer springs (17) are connected to the top surface of the frame (1); the motor (2) is fixedly arranged on the bottom surface of the mounting seat (15), and the bottom end of the main shaft (3) passes through the disc (16) and the mounting seat (15) and is connected to the output shaft of the motor (2) through a coupling.

7. A centrifuge with an automatic balancing rotor structure according to claim 6, characterized in that: The outer fixing sleeve of the mounting seat (15) is provided with a clamp (18), and the clamp (18) is connected to the frame (1).

8. The centrifuge with an automatic balancing rotor structure according to claim 6, characterized in that: A plurality of groups of bearings (19) are arranged on the inner side of the mounting seat (15); the outer rings of the bearings (19) are fixedly connected to the mounting seat (15); and the inner rings of the bearings (19) are fixedly sleeved on the main shaft (3).

9. A method for using a centrifuge with an automatic balancing rotor structure according to any one of claims 1 to 8, characterized in that: The steps include: S1: placing a centrifuge tube containing a sample to be separated into a centrifuge bucket (6); S2: Turn on the motor (2), and the motor (2) drives the rotor (4) through the main shaft (3) to start accelerating rotation; S3: During the rotation of the rotor (4), since the center of mass of the rotor (4) as a whole is not on the rotation axis, the rotor (4) will rotate eccentrically, and as the rotation speed gradually increases, the degree of deviation of the rotor (4) will also gradually increase. At this time, the vibration sensor (20) will generate a vibration signal and transmit the vibration signal to the controller (21); S4: After receiving the vibration signal, the controller (21) automatically generates a leveling scheme and controls the balancing actuator (12) to perform corresponding actions, so that the balancing block (11) slides along the arc groove (8), thereby gradually balancing the rotor (4); S5: The rotation speed of the rotor (4) increases continuously and reaches the target rotation speed, and finally the separation of the sample is completed. After the separation of the sample is completed, the motor (2) is turned off, and the centrifuge tube is taken out from the access port (14).

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