Small centrifugal machine for experiment

Abstract

According to the small centrifugal machine for the experiment, an elastic tightening mechanism composed of a fixing plate, a telescopic rod, a clamping plate and an elastic ring is arranged to clamp a test tube, a fixing mechanism composed of a connecting plate and a clamping rod is used for clamping the clamping plate, and a sliding groove is formed in a fixing frame fixedly connected with a rotating shaft; the shifting block extends out of the cover plate for fixedly connecting the fixed frame and the rotor so as to shift the connecting plate and the clamping rod to clamp the clamping plate; by adopting the technical scheme, the adaptability of the rotor to the diameter of a test tube is effectively improved, and the stability of the rotor in the rotating process is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of centrifugal separation technology equipment, in particular to a small centrifuge for experiments. Background Art

[0002] Small experimental centrifuges are common equipment used in laboratories to separate liquids. They are widely used in medical testing to separate blood, separate cells, and develop drugs using centrifugal force. At present, small experimental centrifuges can adjust the speed and are relatively portable.

[0003] However, in medical testing and other laboratories, the diameters of the laboratory tubes used in experiments are different due to their different uses. For example, the diameter of conventional centrifuge tubes is 10mm-20mm, while the diameter of PCR tubes is between 5mm-8mm. It is necessary to replace different rotors when using a small centrifuge for separation, or use fillers to fill the outside of the laboratory tubes with small diameters before separation.

[0004] The Chinese invention patent with application number CN202310852976.0 proposes a micro high-speed centrifuge, including a base, a circular plate, a telescopic rod, a spring A, a motor, a plug ring, a vortex spring, a U frame A, a U frame B, a leaf spring, a counterweight B, a plug sleeve, and a cone ring plate. The circular base is equipped with a coaxial circular plate driven to rotate by a motor, and two vertical telescopic rods 180 degrees apart in the circumference are symmetrically installed on the circular plate. Each telescopic rod has a spring A for its telescopic reset. This adapts to the centrifugation of various test tube lengths and expands the applicable scenarios of small centrifuges, but it cannot adapt to test tubes of different diameters. Utility Model Content

[0005] The utility model aims to solve the problem of frequent replacement of rotors for centrifuging test tubes with different diameters by providing a small experimental centrifuge to address the deficiencies in the above technology.

[0006] The utility model provides a small-sized centrifuge for experiments, comprising a centrifuge body, a rotating shaft and a rotor, wherein one end of the rotating shaft is fixedly connected to a motor in the centrifuge body, the other end of the rotating shaft is fixedly connected to the rotor, a plurality of jacks for placing test tubes are provided on the rotor at equal intervals, an outer wall of the rotor away from the center is fixedly connected to an elastic tightening mechanism for tightening and clamping the test tube, a fixing frame is fixedly connected to the rotating shaft, and the fixing frame is sleeved outside the rotor, the elastic tightening mechanism is arranged between the rotor and the fixing frame, a fixing mechanism for fixing the elastic tightening mechanism is slidably provided on the inner wall of the fixing frame, and the fixing mechanism is movably connected to the elastic tightening mechanism.

[0007] By setting up an elastic tightening mechanism, test tubes with smaller diameters can be clamped. Since the elastic tightening mechanism is an elastic constraint, there is a certain probability of jitter when the centrifuge runs at high speed. Therefore, a fixing mechanism is set to fix it, which effectively improves the adaptability of the rotor to the test tube diameter and effectively improves the stability of the rotor during the rotation process.

[0008] Preferably, the insertion hole is fixedly connected to the outer wall of the rotor with an extension tube.

[0009] Preferably, the elastic tightening mechanism includes a plurality of fixed plates, telescopic rods, clamps and elastic rings, one end of the fixed plate is fixedly connected to the outer wall of the rotor, the plurality of fixed plates are arranged around the extension tube and are located outside the extension tube, the other end of the fixed plate is spaced apart from the fixed frame, the clamp is arranged corresponding to the fixed plate and spaced apart from the extension tube, the two ends of the telescopic rod are fixedly connected to the clamp and the fixed plate respectively, and the elastic ring is sleeved outside the clamp. The clamp is arc-shaped at one end close to the extension tube. The test tube is clamped by setting an arc-shaped clamp, and since the clamp and the fixed plate are connected by a telescopic tube, the clamp can clamp test tubes of different diameters, and the clamp is then tightened by the elastic ring.

[0010] Preferably, a slide groove is fixedly connected to the inner wall of the fixing frame, and the opening of the slide groove points to one side of the clamping plate or the fixing frame.

[0011] Preferably, the fixing mechanism includes a connecting plate and a clamping rod, the connecting plate is slidably connected in the slide groove, the clamping rod is fixedly connected to one side of the connecting plate, and the clamping rod clamps the clamping plate. The diameter of the clamping rod near the connecting plate is larger than the diameter of the clamping rod away from the connecting plate. The clamping rod and the clamping plate form an interference fit during the sliding process, and a plurality of slots are provided on the side of the clamping rod near the clamping plate. By providing the clamping rod to clamp the clamping plate, the stability of the test tube during separation is effectively improved.

[0012] Preferably, a shift block is fixedly connected to the top of the connecting plate, a cover plate is fixedly connected between the rotor and the fixed frame, the edges of the cover plate are respectively fixedly connected to the edges of the top of the rotor and the fixed frame, the cover plate is provided with a limiting hole, the shift block passes through the limiting hole, and extends outside the limiting hole. By providing the shift block, it is convenient to clamp the clamping rod to the clamping plate.

[0013] Compared with the prior art, it has the following beneficial effects:

[0014] The utility model provides a small-sized centrifuge for experiments. The test tube is clamped by arranging an elastic tightening mechanism composed of a fixed plate, a telescopic rod, a clamping plate and an elastic ring, and the clamping plate is clamped by a fixing mechanism composed of a connecting plate and a clamping rod. A sliding groove is arranged in a fixing frame fixedly connected to a rotating shaft, and a shifting block extending outside a cover plate fixedly connected to the fixing frame and a rotor is used to shift the connecting plate and the clamping rod to clamp the clamping plate. The above technical scheme is adopted to effectively improve the adaptability of the rotor to the diameter of the test tube, and effectively improve the stability of the rotor during the rotation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of a small centrifuge for experiments according to the utility model;

[0017] Figure 2 It is a schematic diagram of the rotor and cover plate of the utility model;

[0018] Figure 3 It is a schematic diagram of the internal structure between the rotor and the fixed frame of the utility model;

[0019] Figure 4 It is a cross-sectional view of the internal structure between the rotor and the fixed frame of the utility model;

[0020] Figure 5 It is an exploded view of the rotor, elastic tightening mechanism and fixing mechanism of the utility model;

[0021] Figure 6 It is a schematic diagram of the elastic tightening mechanism of the utility model;

[0022] Figure 7 It is a schematic diagram of the fixing mechanism of the utility model.

[0023] In the figure, the centrifuge body 1; the rotating shaft 2; the rotor 3; the plug hole 31; the extension tube 32; the elastic tightening mechanism 4; the fixing plate 41; the telescopic rod 42; the clamping plate 43; the elastic ring 44; the fixing frame 5; the slide groove 51; the fixing mechanism 6; the connecting plate 61; the clamping rod 62; the card slot 621; the shifting block 622; the cover plate 7; and the limiting hole 71. DETAILED DESCRIPTION

[0024] In order to make it easier to understand the structure of the present invention and the functional features and advantages that can be achieved, the preferred embodiments of the present invention are described in detail with reference to the drawings as follows:

[0025] Example:

[0026] like Figures 1 to 4As shown, the utility model provides a small centrifuge for experiment, including a centrifuge body 1, a rotating shaft 2 and a rotor 3. The centrifuge body 1 includes a motor, components for controlling the motor, and control buttons. One end of the rotating shaft 2 is fixedly connected to the motor in the centrifuge body 1, and the other end of the rotating shaft 2 is fixedly connected to the rotor 3. The rotating shaft 2 is usually arranged at the top of the centrifuge body 1 and arranged vertically to the ground plane. The rotating shaft 2 is fixedly connected to the output end of the motor. A plurality of jacks 31 for placing test tubes are provided on the rotor 3 at equal intervals. The rotor 3 is usually bowl-shaped, and the side wall is provided with jacks 31 for inserting test tubes so that the inserted test tubes are placed obliquely, which can better improve the centrifugal effect. In order to make the equipment stable during centrifugal motion, the jacks 31 are generally provided in an even number, and the test tubes are placed symmetrically. The jacks 31 are fixedly connected to the outside of the center of the rotor 3 with an extension tube 32, and the extension tube 32 can increase the contact surface between the jacks 31 and the test tubes, thereby improving the stability of the test tubes during centrifugal motion. The diameters of the insertion hole 31 and the extension tube 32 are set to the maximum diameter of a common test tube, which is usually 20 mm.

[0027] As another example, Figures 2 to 6 As shown, the outer wall of the rotor 3 of the present application away from the center is fixedly connected with an elastic tightening mechanism 4 for tightening and clamping the test tube. The elastic tightening mechanism 4 includes a plurality of fixed plates 41, a telescopic rod 42, a clamping plate 43 and an elastic ring 44. One end of the fixed plate 41 is fixedly connected to the outer wall of the rotor 3. The plurality of fixed plates 41 are arranged around the extension tube 32 and are located outside the extension tube 32. The other end of the fixed plate 41 is spaced apart from the fixed frame 5. The clamping plate 43 is arranged corresponding to the fixed plate 41 and is spaced apart from the extension tube 32. The two ends of the telescopic rod 42 are fixedly connected to the clamping plate 43 and the fixed plate 41 respectively. The elastic ring 44 is sleeved outside the clamping plate 43.

[0028] The number of the fixing plates 41 is preferably four and they are symmetrically arranged around the center of the extension tube 32. Similarly, the number of the clamping plates 43 and the telescopic rods 42 is the same as that of the fixing plates 41 and they are arranged correspondingly. The elastic ring 44 is an elastic ring. In order to tighten more stably, two elastic rings 44 are arranged. Two telescopic rods 42 are connected between each clamping plate 43 and the fixing plate 41, and the elastic ring 44 is arranged between the two telescopic rods 42.

[0029] The end of the clamp 43 close to the extension tube 32 is arc-shaped, which is convenient for inserting the test tube and stretching the clamp 43 so that the test tube can have more contact surface with the clamp 43 and the tightening is more stable. Since the test tube is generally cylindrical, the contact surface between the clamp 43 and the test tube is also arc-shaped.

[0030] As another example, Figure 5 and Figure 7As shown, a fixing frame 5 is fixedly connected to the rotating shaft 2 of the present application, and the fixing frame 5 is sleeved outside the rotor 3, and the elastic tightening mechanism 4 is placed between the rotor 3 and the fixing frame 5, and a fixing mechanism 6 for fixing the elastic tightening mechanism 4 is slidably provided on the inner wall of the fixing frame 5, and the fixing mechanism 6 is movably connected to the elastic tightening mechanism 4.

[0031] The inner wall of the fixed frame 5 is fixedly connected with a chute 51, and the opening of the chute 51 points to the clamping plate 43 or one side of the fixed frame 5. The fixing mechanism 6 includes a connecting plate 61 and a clamping rod 62, the connecting plate 61 is slidably connected in the chute 51, the clamping rod 62 is fixedly connected to one side of the connecting plate 61, and the clamping rod 62 clamps the clamping plate 43. The clamping rod 62 is set to two upper and lower ones, which are inserted between the clamping plate 43 and the fixed plate 41, and the clamping rod 62 is a plastic material with certain toughness. The diameter of the side of the clamping rod 62 close to the connecting plate 61 is larger than the diameter of the side of the clamping rod 62 away from the connecting plate 61. The clamping rod 62 and the clamping plate 43 form an interference fit during the sliding process, and do not need to be clamped too tightly. When the connecting plate 61 is pushed, the clamping rod 62 is driven to slide on the chute 51 and inserted between the clamping plates 43. After the centrifugation of the test tube is completed, the connecting plate 61 is pushed to rotate in the opposite direction of the chute 51, and the test tube can be pulled out. A plurality of slots 621 are formed on one side of the clamping rod 62 close to the clamping plate 43 . The slots 621 can increase the contact surface between the clamping rod 62 and the clamping plate 43 , making the clamping more stable.

[0032] As another example, Figure 1 and Figure 2 As shown, a shift block 622 is fixedly connected to the top of the connecting plate 61 of the present application, and a cover plate 7 is fixedly connected between the rotor 3 and the fixed frame 5. The edges of the cover plate 7 are fixedly connected to the edges of the top of the rotor 3 and the fixed frame 5 respectively. The cover plate 7 is provided with a limiting hole 71, and the shift block 622 passes through the limiting hole 71 and extends to the outside of the limiting hole 71. The cover plate 7 can shield the structure between the fixed frame 5 and the rotor 3, which can reduce the dust and other debris from falling into the interior and making it inconvenient to clean, and is more in line with the design of ergonomics. The limiting hole 71 limits the movable position of the shift block 622. In order to make the rotor 3 rotate stably during the rotation process, two shift blocks 622 are symmetrically arranged. Similarly, the limiting holes 71 are symmetrically arranged, and the direction of the shift block 622 is consistent with the rotation direction of the rotor 3. When the rotor 3 rotates, the shift block 622 is blocked by the hole wall of the limiting hole 71. After the test tube is inserted, the shift block 622 is moved, and the shift block 622 drives the connecting plate 61 and the clamping rod 62 to slide on the slide groove 51, so that the clamping rod 62 is clamped outside the clamping plate 43. After the centrifugal movement is completed, the shift block 622 is moved in the opposite direction, the clamping rod 62 and the clamping plate 43 are released from the interference fit, and the test tube can be pulled out.

[0033] The working principle of a small centrifuge for experiments in the present application is as follows: when in use, test tubes with the same diameter are inserted into the jack 31 in a symmetrical manner. When inserting into the jack 31, the pressure plate is opened, and the elastic ring 44 presses the pressure plate against the outer wall of the test tube. The dial block 622 is moved to drive the connecting plate 61 and the clamping rod 62 to slide on the slide groove 51, so that the clamping rod 62 is clamped outside the clamping plate 43. The clamping rod 62 and the clamping plate 43 form an interference fit, and the clamping plate 43 is clamped, which effectively reduces the probability of the clamping plate 43 and the test tube shaking during rotation. When the centrifugation of the test tube is completed, the dial block 622 is moved in the direction to separate the clamping rod 62 and the clamping plate 43, and the test tube can be pulled out. When it is necessary to centrifuge a test tube with a smaller or larger diameter, the above steps can be repeated.

[0034] The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention by using the above technical content without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the present invention without departing from the content of the technical solution of the present invention belong to the protection scope of the present technical solution.

Claims

1. A small centrifuge for experimental use, characterized in that , comprising a centrifuge body (1), a rotating shaft (2) and a rotor (3), one end of the rotating shaft (2) being fixedly connected to a motor in the centrifuge body (1), the other end of the rotating shaft (2) being fixedly connected to the rotor (3), a plurality of jacks (31) for placing test tubes being provided at equal intervals on the rotor (3), an outer wall of the rotor (3) away from the center thereof being fixedly connected to an elastic tightening mechanism (4) for tightening and clamping the test tube, a fixing frame (5) being fixedly connected to the rotating shaft (2), and the fixing frame (5) being sleeved outside the rotor (3), the elastic tightening mechanism (4) being placed between the rotor (3) and the fixing frame (5), a fixing mechanism (6) for fixing the elastic tightening mechanism (4) being slidably provided on the inner wall of the fixing frame (5), and the fixing mechanism (6) being movably connected to the elastic tightening mechanism (4).

2. A small experimental centrifuge according to claim 1, characterized in that: The insertion hole (31) is fixedly connected to an extension tube (32) on the outer wall of the rotor (3).

3. A small experimental centrifuge according to claim 2, characterized in that: The elastic tightening mechanism (4) comprises a plurality of fixed plates (41), a telescopic rod (42), a clamping plate (43) and an elastic ring (44); one end of the fixed plate (41) is fixedly connected to the outer wall of the rotor (3); the plurality of fixed plates (41) are arranged around the extension tube (32) and are located outside the extension tube (32); the other end of the fixed plate (41) is spaced apart from the fixed frame (5); the clamping plate (43) is arranged corresponding to the fixed plate (41) and is spaced apart from the extension tube (32); the two ends of the telescopic rod (42) are fixedly connected to the clamping plate (43) and the fixed plate (41) respectively; and the elastic ring (44) is sleeved outside the clamping plate (43).

4. A small experimental centrifuge according to claim 3, characterized in that: A slide groove (51) is fixedly connected to the inner wall of the fixed frame (5), and the opening of the slide groove (51) points to the clamping plate (43) or one side of the fixed frame (5).

5. A small experimental centrifuge according to claim 4, characterized in that: The fixing mechanism (6) comprises a connecting plate (61) and a clamping rod (62), wherein the connecting plate (61) is slidably connected in the sliding groove (51), and the clamping rod (62) is fixedly connected to one side of the connecting plate (61), and the clamping rod (62) clamps the clamping plate (43).

6. A small experimental centrifuge according to claim 5, characterized in that: The diameter of the side of the clamping rod (62) close to the connecting plate (61) is larger than the diameter of the side of the clamping rod (62) away from the connecting plate (61); the clamping rod (62) and the clamping plate (43) form an interference fit during the sliding process; and a plurality of slots (621) are provided on the side of the clamping rod (62) close to the clamping plate (43).

7. A small experimental centrifuge according to claim 6, characterized in that: A shifting block (622) is fixedly connected to the top of the connecting plate (61); a cover plate (7) is fixedly connected between the rotor (3) and the fixing frame (5); edges of the cover plate (7) are respectively fixedly connected to edges of the tops of the rotor (3) and the fixing frame (5); a limiting hole (71) is provided on the cover plate (7); the shifting block (622) passes through the limiting hole (71) and extends outside the limiting hole (71).

8. A small experimental centrifuge according to claim 3, characterized in that: One end of the clamping plate (43) close to the extension tube (32) is arc-shaped.

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