Internally compensated cell and tissue centrifuge with switchable counterweight

Abstract

This application provides an internally compensated cell and tissue centrifuge device with switchable counterweights, including a centrifuge body, a multi-axis robot and a counterweight placement platform on both sides of the centrifuge body, the multi-axis robot having a gripping device, and the counterweight placement platform for placing counterweights. The centrifuge body includes a centrifuge base, on which a rotatable centrifuge disc is provided. The centrifuge disc includes a central rotating seat, and multiple rotating arm devices are evenly distributed around the central rotating seat. Each rotating arm device includes a rotating arm frame, one end of which is connected to the central rotating seat, and the other end of which is provided with a swingable loading platform for placing a slide preparation chamber. This solves the problem of the need for counterweights in centrifuges during small-batch testing.

Description

Technical Field

[0001] This invention relates to the field of biological detection, and in particular to an internally compensated cell and tissue centrifugation device with switchable counterweight. Background Technology

[0002] After collection, cervical cell samples need to be transferred to the reservoir column in the slide preparation chamber with necessary reagents. The preparation chamber is then placed in a centrifuge for centrifugation. A centrifuge is a common laboratory device that separates materials into liquids and solids by rotating a carrier. This allows the sample to quickly adhere to a glass slide at the bottom of the preparation chamber, completing the slide preparation process.

[0003] To meet peak testing rates, centrifuges typically have multiple rotating arms, allowing for the simultaneous centrifugation of multiple tablet preparation chambers in a single run. However, when centrifuging only a single or a small number of tablet preparation chambers, some placement slots may not be fully filled, causing the centrifuge disc's center of gravity to be off-center from the rotation axis. This results in poor dynamic balance and vibration during high-speed rotation. Summary of the Invention

[0004] This invention provides an internally compensated cell and tissue centrifuge device with switchable counterweights, which solves the problem of centrifuges needing counterweights when performing small-batch testing.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an internally compensated cell and tissue centrifuge device with switchable counterweight, including a centrifuge body, a multi-axis robot and a counterweight placement platform respectively provided on both sides of the centrifuge body, the multi-axis robot is provided with a clamping device, the counterweight placement platform is used to place counterweights, the centrifuge body includes a centrifuge base, a rotatable centrifuge disc is provided on the centrifuge base, the centrifuge disc includes a central rotating seat, a plurality of rotating arm devices are evenly distributed around the central rotating seat, the rotating arm device includes a rotating arm frame, one end of the rotating arm frame is connected to the central rotating seat, and the other end of the rotating arm frame is provided with a swingable loading platform, the loading platform is used to place the slide preparation chamber.

[0006] In the preferred embodiment, the number of boom devices is even. The boom has a through groove along its length. A central platform is located at the center of the central rotating seat. A ball bearing is located on the central platform. A floating frame is located at the end of the boom away from the central rotating seat. A lever is located on one side of each boom and is hinged to the boom in the middle. The boom device rotates to make the floating frame press one end of the lever. A push rod is located at the other end of the lever. The push rod pushes the ball bearing to the opposite side of the boom.

[0007] In the preferred embodiment, the counterweight placement platform is provided with multiple ball bearings, each ball bearing being a hollow sphere with the same diameter but different wall thicknesses.

[0008] In the preferred embodiment, the end of the rotating boom is provided with an inclined extension frame, the floating frame is slidably connected to the inclined extension frame, a first spring is provided between the floating frame and the inclined extension frame, a pressure plate is provided at the lower end of the floating frame, a sleeve hole is provided at the lower end of the pressure plate, the sleeve hole is sleeved with the end of the lever, the diameter of the sleeve hole is larger than the diameter of the end of the lever, and multiple through holes are provided at the lower end of the central platform, each through hole is used for each push rod to pass through.

[0009] In the preferred embodiment, a limiting cover is provided at the end of the rotating arm away from the central rotating seat. A receiving cavity is provided inside the limiting cover. A telescopic block is provided at the bottom end of the through groove inside the receiving cavity. A wedge-shaped surface is provided at the upper end of the side of the telescopic block near the central rotating seat. A second spring is provided between the telescopic block and the bottom end of the through groove. A pressure rod is provided at the lower end of the telescopic block. The lower end of the pressure rod abuts against the outer wall of the lever.

[0010] In the preferred embodiment, the end of the pressure rod away from the lever is provided with an adjusting sleeve, the pressure rod is threadedly connected to the adjusting sleeve, and a third spring is provided at one end of the adjusting sleeve.

[0011] In the preferred embodiment, the end of the through groove away from the central rotating seat is higher than the end near the central rotating seat. The central platform is provided with multiple radially arranged guide rolling grooves, which are connected to the through groove. The end of the guide rolling groove away from the center is higher.

[0012] In the preferred embodiment, the central base has a central recess, and the guide rolling groove is connected to the central recess.

[0013] In the preferred embodiment, baffles are provided on both sides of the guide rolling groove.

[0014] In the preferred embodiment, a guide sliding part is provided at the lower end of the central platform, which is slidably connected to the central rotating seat. A fourth spring is provided inside the guide sliding part, with one end of the fourth spring abutting against the central rotating seat. A displacement sensor is provided inside the central rotating seat to detect the displacement of the central platform. A cylinder is provided on the counterweight placement platform, and a telescopic platform that can be raised and lowered is provided inside the cylinder. A fifth spring is provided inside the telescopic platform, with the lower end of the fifth spring abutting against the bottom end of the cylinder. Each ball bearing is provided on each telescopic platform.

[0015] The beneficial effects of this invention are as follows: The symmetrical design of the rotating arm necessitates the addition of a counterweight on the opposite side of the tablet preparation chamber, ensuring precise placement and quantity, and facilitating automated programming. The device incorporates ball bearings that automatically locate the required counterweight on the rotating arm using centrifugal force, eliminating the need for manual intervention or external mechanisms, resulting in low cost and high fault tolerance. A counterweight placement platform with ball bearings of the same diameter but different masses is used, with a multi-axis robot automatically changing the ball bearings according to the specifications and weight of the tablet preparation chamber, adapting to various sizes of tablet preparation chambers. This not only achieves horizontal dynamic balance but also ensures that the center of gravity on both sides remains consistent in the vertical direction, preventing unnecessary bending moments on the drive motor or connecting shaft and improving dynamic balance during centrifugation. A sloped surface, higher on the outside and lower on the inside, guides the ball bearings, and after centrifugal rotation, the ball bearings automatically return to the center under gravity, ensuring stable and reliable counterweighting for the next cycle. A displacement sensor detects the height of the central platform, ensuring the correct ball bearing specifications are used. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a layout diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the counterweight placement platform of the present invention.

[0019] Figure 3 This is a schematic diagram of the clamping block of the present invention.

[0020] Figure 4 This is a schematic diagram of the centrifuge of the present invention.

[0021] Figure 5 This is a diagram of the internal structure of the centrifuge disc of the present invention.

[0022] Figure 6 This is a schematic diagram of the middle part of the centrifuge plate of the present invention.

[0023] Figure 7 This is a schematic diagram of the lower part of the rotating arm device of the present invention.

[0024] Figure 8 This is a top view of the centrifuge disc of the present invention.

[0025] Figure 9 This is a cross-sectional view of the centrifuge disc of the present invention.

[0026] Figure 10 This is a cross-sectional view of the central pedestal of the present invention.

[0027] Figure 11 This is a cross-sectional view of the through hole in the central pedestal of the present invention.

[0028] Figure 12 This is a schematic diagram of the central pedestal of the present invention.

[0029] Figure 13 This is a side sectional view of the limiting cover of the present invention.

[0030] Figure 14 This is a front sectional view of the limiting cover of the present invention.

[0031] Figure 15 This is a structural diagram of the floating frame of the present invention.

[0032] Figure 16 This is a structural diagram of the limiting cover of the present invention.

[0033] Figure 17 This is a schematic diagram of the height imbalance of the present invention.

[0034] In the diagram: Centrifuge base 1; Centrifuge disc 2; Central rotating seat 201; Snap-fit ​​post 202; Rotating arm device 3; Rotating arm frame 301; Inclined frame snap-fit ​​groove 302; Rotating arm mounting groove 303; Through groove 304; Top rod 305; Lever 306; Limit cover 307; Telescopic block 308; Wedge surface 309; Pressure rod 310; Second spring 311; Adjusting sleeve 312; Third spring 313; Centrifuge drive motor 4; Connecting sleeve 5; Inclined frame 6; Loading platform 601; Floating frame 602 ; Tablet press 603; Sleeve hole 604; First spring 605; Central platform 7; Baffle 701; Guide rolling groove 702; Central recess 703; Through hole 704; Fourth spring 705; Guide sliding part 706; Ball bearing 8; Centrifuge body 9; Multi-axis robot 10; Clamping device 1001; Clamping block 1002; Ball groove 1003; Arc groove 1004; Counterweight placement platform 11; Cylinder 1101; Telescopic platform 1102; Fifth spring 1103; Displacement sensor 12. Detailed Implementation

[0035] like Figure 1-17 In this invention, a cell and tissue centrifuge device with switchable counterweight internal compensation includes a centrifuge body 9. A multi-axis robot 10 and a counterweight placement platform 11 are respectively provided on both sides of the centrifuge body 9. The multi-axis robot 10 is provided with a clamping device 1001. The counterweight placement platform 11 is used to place counterweights. The centrifuge body 9 includes a centrifuge base 1. A rotatable centrifuge disc 2 is provided on the centrifuge base 1. The centrifuge disc 2 includes a central rotating seat 201. Multiple rotating arm devices 3 are evenly distributed around the central rotating seat 201. The rotating arm device 3 includes a rotating arm frame 301. One end of the rotating arm frame 301 is connected to the central rotating seat 201. The other end of the rotating arm frame 301 is provided with a swingable loading platform 601. The loading platform 601 is used to place the slide preparation chamber.

[0036] The clamping device 1001 can be a three-jaw finger cylinder, with a clamping block 1002 installed on the finger part. The clamping block 1002 has a ball groove 1003 and an arc groove 1004 on its inner side. The ball groove 1003 is used to clamp spherical objects, and the arc groove 1004 is used to clamp the liquid storage cylinder of the film preparation chamber and place it in the loading platform 601.

[0037] The multi-axis robot 10 can grab counterweights from the counterweight placement platform 11 and place them on the load platform 601 on the centrifuge body 9, which lacks a film preparation compartment, thus optimizing the dynamic balance of the centrifuge disc 2 during rotation.

[0038] In the preferred embodiment, the number of boom devices 3 is even. The boom 301 is provided with a through groove 304 along the length direction. The central rotating seat 201 is provided with a central platform 7. The central platform 7 is provided with a ball bearing 8. The end of the boom 301 away from the central rotating seat 201 is provided with a floating frame 602. Each boom 301 is provided with a lever 306 on one side, which is hinged to the boom 301 in the middle. The boom device 3 rotates so that the floating frame 602 presses one end of the lever 306. The other end of the lever 306 is provided with a push rod 305. The push rod 305 pushes the ball bearing 8 to the opposite side of the boom 301.

[0039] The number of rotating arm devices 3 is even, such as four, six, or eight. Each rotating arm device 3 has one rotating arm device 3 on the opposite side, arranged in a straight line. Centrifuges with an even number of rotating arms have the advantage of easy counterweighting. When there is only one tablet preparation chamber, a counterweight of equal weight can be placed in the loading platform 601 of the opposite rotating arm device 3. However, centrifuges with an odd number of rotating arms require multiple counterweights or filling all remaining empty spaces to restore dynamic balance if the tablet preparation chamber is small. For example, with only one tablet preparation chamber requiring centrifugation, three or five rotating arms require filling the entire loading platform 601, while nine rotating arms require at least two additional tablet preparation chambers to form an equilateral triangle shape for normal operation.

[0040] Because the amount of compensation counterweight varies depending on the situation, especially for automated compensation, centrifuges with an even number of symmetrically arranged rotating arms are much less difficult to compensate than centrifuges with an odd number of rotating arms.

[0041] The counterweight can be a slide preparation chamber with the same mass as the sample or other weights of the same mass.

[0042] One end of the rotating boom 301 is provided with a rotating boom mounting groove 303, which is engaged with the locking post 202. The side wall of the through groove 304 is provided with multiple inclined frame locking grooves 302, and one end of the inclined frame 6 is engaged in the inclined frame locking groove 302.

[0043] Due to centrifugal force, the eccentric ball bearing 8 rolls along the through groove 304 of the opposite rotating arm 301 to the end. Since it cannot roll to the same distance as the tablet chamber, the lever arm of the ball bearing 8 relative to the center of rotation is slightly shorter than that of the tablet chamber. The weight of the ball bearing 8 is slightly larger than that of the tablet with the sample, so that the total torque on both sides can be equal. In this way, the two rotating arm devices 3 can ensure the symmetry of the center of gravity.

[0044] The centrifuge base 1 is equipped with a centrifuge drive motor 4, which is connected to the central rotating seat 201 through a docking sleeve 5. The centrifuge drive motor 4 drives the centrifuge disc 2 to rotate.

[0045] In the preferred embodiment, the counterweight placement platform 11 is provided with a plurality of balls 8, each ball 8 being a hollow sphere with the same diameter but different wall thicknesses.

[0046] The ball bearings 8 have the same outer diameter, which can be adapted to film preparation chambers of different weights. If the specifications or weight of the film preparation chamber changes, the clamping device 1001 can simply grab a ball bearing 8 of equal mass and replace it on the central platform 7. The fact that the outer diameter of the ball bearings 8 does not change ensures the normal operation of each mechanism and prevents interference.

[0047] Since the intervals between changing the specifications of the film production chamber are very long, the ball bearing 8 does not need to be changed frequently, so there is no problem of affecting the normal cycle time of the workstation.

[0048] In the preferred embodiment, the end of the rotating boom 301 is provided with an inclined extension frame 6, the floating frame 602 is slidably connected to the inclined extension frame 6, a first spring 605 is provided between the floating frame 602 and the inclined extension frame 6, the lower end of the floating frame 602 is provided with a pressure plate 603, the lower end of the pressure plate 603 is provided with a sleeve hole 604, the sleeve hole 604 is sleeved with the end of the lever 306, the diameter of the sleeve hole 604 is larger than the diameter of the end of the lever 306, and the lower end of the central platform 7 is provided with multiple through holes 704, each through hole 704 is used for each push rod 305 to pass through.

[0049] Because the inclined extension frame 6 is arranged at an angle, during rotation, centrifugal force causes the floating frame 602 to compress the push rod 305 and move downward. The sleeve hole 604 presses down on the end of the lever 306, and the push rod 305 moves upward through the through hole 704 and pushes the lower end of the ball 8. The ball 8 is forced to roll to the other side. Once the ball 8 becomes eccentric, centrifugal force acts on the ball 8, causing it to continue moving to the opposite side until it is stopped at the end of the through groove 304.

[0050] When all the loading platforms 601 contain film chambers, all the push rods 305 will be raised at the same height. Although the ball bearings 8 are lifted, due to the circumferential arrangement of each push rod 305, the ball bearings 8 are still stuck in the middle and will not be eccentric.

[0051] Although the ball bearings 8 balance the weight of the extra film preparation chamber on the opposite side, the balance is only horizontal. If the center of gravity at the height where the ball bearings 8 stop is close to the same height as the weight of the opposite side's loading platform 601 and film preparation chamber, since there is no film preparation chamber on this side's loading platform 601, it is higher than the opposite side's loading platform 601. At this time, although it is balanced horizontally, a torque will still be generated on the central axis in terms of height, causing a bending moment on the motor shaft and generating vibration.

[0052] In a preferred embodiment, the end of the rotating boom 301 away from the central rotating seat 201 is also provided with a limiting cover 307. The limiting cover 307 is provided with a receiving cavity. The bottom end of the through groove 304 in the receiving cavity is provided with a telescopic block 308. The upper end of the side of the telescopic block 308 near the central rotating seat 201 is provided with a wedge-shaped surface 309. A second spring 311 is provided between the telescopic block 308 and the bottom end of the through groove 304. The lower end of the telescopic block 308 is provided with a pressure rod 310. The lower end of the pressure rod 310 abuts against the outer wall of the lever 306.

[0053] The pressure rod 310 abuts against the pressure plate 603 at the same end of the lever 306. When the ball 8 rolls into the receiving cavity, the left, right and upper sides are limited to prevent it from flying out due to excessive centrifugal force.

[0054] The telescopic block 308 is inserted into the groove at the bottom of the through slot 304. The ball bearing 8 abuts against and presses against the wedge-shaped surface 309. The telescopic block 308 retracts, causing the ball bearing 8 to continue moving forward a certain distance until the centrifugal force is resisted by the holding force of the second spring 311, and the ball bearing 8 is rebalanced. At this time, the pressure rod 310 pushes down the lever 306 and pulls the pressure plate 603, causing the floating frame 602 to press down. The angle of the wedge-shaped surface 309 can be set to be smaller, so that the ball bearing 8 moves less outward and the floating frame 602 descends more, ultimately making the device balanced in both height and horizontal direction.

[0055] In the preferred embodiment, the end of the pressure rod 310 away from the lever 306 is provided with an adjusting sleeve 312, the pressure rod 310 is threadedly connected to the adjusting sleeve 312, and one end of the adjusting sleeve 312 is provided with a third spring 313.

[0056] The telescopic block 308 has at least three through holes, the middle one being a stepped countersunk hole for placing the adjusting sleeve 312 and the pressure rod 310. Each hole end has a threaded set screw to adjust the compression of each spring. The total length of the adjusting sleeve 312 and the pressure rod 310 is adjustable, making it easy to find the appropriate extension length when adjusting the pressure rod 310.

[0057] The limiting cover 307 has a guide cavity in the middle, the lower end of the limiting cover 307 is open, the upper side and the left and right sides of the limiting ball 8 are provided with snap-fit ​​protrusions, which can be snapped into the side wall of the rotating arm 301. The upper end face is provided with a through cut groove to facilitate the passage of the wrench. The inner top wall of the cavity is provided with a limiting protrusion to prevent the telescopic block 308 from falling upward.

[0058] In the preferred embodiment, the end of the through groove 304 away from the central rotating seat 201 is higher than the end near the central rotating seat 201. The central platform 7 is provided with a plurality of radially arranged guide rolling grooves 702, which are connected to the through groove 304. The end of the guide rolling groove 702 away from the center is higher.

[0059] When rotating, the ball 8 can roll along the guide rolling groove 702 and the through groove 304 to the end. When the rotation stops, the ball 8 can return to the center of the central platform 7 along the ramp surface.

[0060] In the preferred embodiment, the central base 7 has a central recess 703 at its center, and the guide rolling groove 702 is connected to the central recess 703.

[0061] When there is no need for counterweight, the central recess 703 allows the ball 8 to stop stably in the center of the central base 7, preventing eccentricity due to the device being not level.

[0062] In the preferred embodiment, baffles 701 are provided on both sides of the guide rolling groove 702.

[0063] The baffle 701 and the auxiliary guide roller groove 702 prevent the balls 8 from coming out laterally due to excessive centrifugal force when passing through.

[0064] In a preferred embodiment, the lower end of the central platform 7 is provided with a guide sliding part 706, which is slidably connected to the central rotating seat 201. A fourth spring 705 is provided inside the guide sliding part 706, and one end of the fourth spring 705 abuts against the central rotating seat 201. A displacement sensor 12 is provided inside the central rotating seat 201, which is used to detect the displacement of the central platform 7. A cylinder 1101 is provided on the counterweight placement platform 11, and a liftable telescopic platform 1102 is provided inside the cylinder 1101. A fifth spring 1103 is provided inside the telescopic platform 1102, and the lower end of the fifth spring 1103 abuts against the bottom end of the cylinder 1101. Each ball bearing 8 is provided on each telescopic platform 1102.

[0065] When the ball bearing 8 is on the central platform 7, the central platform 7 will sink a short distance and form a step with the central rotating seat 201. At this time, the ball bearing 8 will not leave the range of the central platform 7. When the ball bearing 8 is eccentric and the device rotates to a certain angular velocity, the ball bearing 8 can cross the step and reach the through groove 304.

[0066] Since the outer diameters of the various balls 8 are identical, it is difficult to visually determine whether the balls 8 placed on the central platform 7 are suitable for the weight of the film preparation chamber. Therefore, a displacement sensor 12 is installed. When each ball 8 is placed, the central platform 7 moves down a different distance due to its different mass. The distance from the ball 8 to the displacement sensor 12 can effectively determine whether the counterweight is correctly matched. The displacement sensor 12 is connected to an external electrical control system. Furthermore, to allow operators to visually determine whether the correct ball 8 has been picked up when changing the counterweight, the balls 8 can be placed on the telescopic platform 1102. The lower the telescopic platform 1102, the heavier the ball 8 on it.

[0067] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A cell and tissue centrifuge device with switchable counterweights and internal compensation, characterized in that: The centrifuge body (9) includes a centrifuge base (1), a multi-axis robot (10) and a counterweight placement platform (11) on both sides of the centrifuge body (9). The multi-axis robot (10) is equipped with a clamping device (1001), and the counterweight placement platform (11) is used to place counterweights. The centrifuge body (9) includes a centrifuge base (1), and a rotatable centrifuge disc (2) is provided on the centrifuge base (1). The centrifuge disc (2) includes a central rotating seat (201), and multiple rotating arm devices (3) are evenly distributed around the central rotating seat (201). The rotating arm device (3) includes a rotating arm frame (301), one end of which is connected to the central rotating seat (201), and the other end of which is equipped with a swingable loading platform (601) for placing the film preparation chamber. The number of boom devices (3) is even. The boom (301) is provided with a through groove (304) along the length direction. The center of the central rotating seat (201) is provided with a central platform (7). The central platform (7) is provided with a ball (8). The end of the boom (301) away from the central rotating seat (201) is provided with a floating frame (602). Each boom (301) is provided with a lever (306) on one side, which is hinged to the boom (301) in the middle. The boom device (3) rotates so that the floating frame (602) squeezes one end of the lever (306). The other end of the lever (306) is provided with a push rod (305). The push rod (305) pushes the ball (8) to the opposite side of the boom (301). The counterweight placement platform (11) is provided with multiple balls (8), each ball (8) being a hollow sphere with the same diameter but different wall thicknesses; The rotating boom (301) is provided with an inclined extension frame (6) at its end. The floating frame (602) is slidably connected to the inclined extension frame (6). A first spring (605) is provided between the floating frame (602) and the inclined extension frame (6). A pressure plate (603) is provided at the lower end of the floating frame (602). A sleeve hole (604) is provided at the lower end of the pressure plate (603). The sleeve hole (604) is sleeved with the end of the lever (306). The diameter of the sleeve hole (604) is larger than the diameter of the end of the lever (306). A number of through holes (704) are provided at the lower end of the central platform (7). Each through hole (704) is used for each push rod (305) to pass through.

2. The internally compensated cell and tissue centrifuge device with switchable counterweights according to claim 1, characterized in that: The end of the rotating boom (301) away from the central rotating seat (201) is also provided with a limiting cover (307). The limiting cover (307) is provided with a receiving cavity. The bottom end of the through groove (304) in the receiving cavity is provided with a telescopic block (308). The upper end of the telescopic block (308) near the central rotating seat (201) is provided with a wedge-shaped surface (309). A second spring (311) is provided between the telescopic block (308) and the bottom end of the through groove (304). The lower end of the telescopic block (308) is provided with a pressure rod (310). The lower end of the pressure rod (310) abuts against the outer wall of the lever (306).

3. The internally compensated cell and tissue centrifuge device with switchable counterweights according to claim 2, characterized in that: The end of the pressure rod (310) away from the lever (306) is provided with an adjusting sleeve (312). The pressure rod (310) is threadedly connected to the adjusting sleeve (312). One end of the adjusting sleeve (312) is provided with a third spring (313).

4. The internally compensated cell and tissue centrifuge device with switchable counterweight according to claim 2, characterized in that: a through groove (304) The end away from the central rotating seat (201) is higher than the end near the central rotating seat (201). The central platform (7) is provided with multiple radial guide rolling grooves (702). The guide rolling grooves (702) are connected to the through groove (304). The end of the guide rolling grooves (702) away from the center is higher.

5. The internally compensated cell and tissue centrifuge device with switchable counterweight according to claim 4, characterized in that: The central base (7) has a central recess (703) at its center, and the guide rolling groove (702) is connected to the central recess (703).

6. The internally compensated cell and tissue centrifuge device with switchable counterweight according to claim 4, characterized in that: The guide rolling groove (702) is provided with baffles (701) on both sides.

7. The internally compensated cell and tissue centrifuge device with switchable counterweight according to claim 1 or 5, characterized in that: The lower end of the central platform (7) is provided with a guide sliding part (706), which is slidably connected to the central rotating seat (201). The guide sliding part (706) is provided with a fourth spring (705), one end of which abuts against the central rotating seat (201). The central rotating seat (201) is provided with a displacement sensor (12), which is used to detect the displacement of the central platform (7). The counterweight placement platform (11) is provided with a cylinder (1101), which is provided with a liftable telescopic platform (1102). The telescopic platform (1102) is provided with a fifth spring (1103), the lower end of which abuts against the bottom of the cylinder (1101). Each ball (8) is provided on each telescopic platform (1102).

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