Sensor assembly for detecting rotating speed of centrifugal machine

Abstract

The utility model discloses a sensor assembly for detecting the rotating speed of a centrifugal machine, which relates to the technical field of metering and testing and comprises a directional reflective film, a photoelectric probe, a photoelectric signal conversion amplifier and a mounting support frame, the directional reflective film is fixedly adhered to a rotating part in the centrifugal machine, and the photoelectric probe is arranged in a shell of the centrifugal machine. The installation supporting frame comprises a first traction piece and a second traction piece, the first end of the first traction piece is fixedly connected with the first end of the photoelectric probe, the second end of the first traction piece is fixedly arranged outside the rotating space of the centrifugal machine, and the first end of the second traction piece is fixedly connected with the second end of the photoelectric probe. The second end of the second traction piece is fixedly arranged outside the rotating space of the centrifugal machine, and the photoelectric signal conversion amplifier communicates with the photoelectric probe. The rotating speed detection device is suitable for rotating speed detection of the centrifugal machine with the upper cover provided with an observation hole or the upper cover made of colorless transparent acrylic materials, and is also suitable for rotating speed detection of the centrifugal machine with the upper cover not provided with an observation hole or the upper cover made of colored acrylic materials.

Description

Technical Field

[0001] The utility model relates to the technical field of metrology and testing, in particular to a sensor assembly for detecting the rotational speed of a centrifuge. Background Art

[0002] Centrifuges are widely used in fields such as medical treatment and biological science experiments. The rotational speed of the centrifuge needs to be regularly calibrated to ensure the normal operation of the centrifuge.

[0003] Common centrifuges mainly include a housing and a rotor. Among them, the rotor rotates in the rotation space inside the housing. The housing includes a lower box and an upper cover. The top of the lower box is open, and the upper cover is buckled on the top of the lower box to cover the opening at the top of the lower box. A rubber sealing ring is usually arranged at the opening at the top of the lower box. The connection position between the upper cover and the lower box is sealed through the rubber sealing ring. And generally, there is also a safety gap left between the upper cover and the lower box after the upper cover presses on the rubber sealing ring to ensure that the upper cover fully compresses the rubber sealing ring.

[0004] When the upper cover has an observation hole or the upper cover is made of colorless transparent acrylic material, the rotational speed of the centrifuge can be detected by using a traditional non-contact photoelectric speed sensor outside the centrifuge. For centrifuges without an observation hole or with a colored acrylic upper cover, the rotational speed cannot be detected by using a non-contact photoelectric speed sensor outside the centrifuge. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a sensor assembly for detecting the rotational speed of a centrifuge, which can solve the problems existing in the above-mentioned prior art, and can be applicable to the rotational speed detection of centrifuges with an observation hole in the upper cover or made of colorless transparent acrylic material, and can also be applicable to the rotational speed detection of centrifuges without an observation hole in the upper cover or made of colored acrylic material.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] The utility model provides a sensor assembly for detecting the rotational speed of a centrifuge, including a directional reflective film, a photoelectric probe, a photoelectric signal conversion amplifier and an installation support frame. The directional reflective film is fixedly pasted on the rotating part inside the centrifuge. The photoelectric probe is placed inside the housing of the centrifuge. The installation support frame includes a first traction member and a second traction member. The first end of the first traction member is fixedly connected to the first end of the photoelectric probe. The second end of the first traction member is fixedly arranged outside the rotation space of the centrifuge. The first end of the second traction member is fixedly connected to the second end of the photoelectric probe. The second end of the second traction member is fixedly arranged outside the rotation space of the centrifuge. The photoelectric signal conversion amplifier is communicatively connected with the photoelectric probe.

[0008] Preferably, the first traction member includes a first telescopic rod, a first connecting belt, and a first magnet. The first magnet is magnetically fixed outside the rotating space of the centrifuge. One end of the first connecting belt is fixedly connected to the first magnet, and the other end of the first connecting belt is placed inside the housing of the centrifuge and fixedly connected to one end of the first telescopic rod. The other end of the first telescopic rod is fixedly connected to the first end of the photoelectric probe. The second traction member includes a second telescopic rod, a second connecting belt, and a second magnet. The second magnet is magnetically fixed outside the rotating space of the centrifuge. One end of the second connecting belt is fixedly connected to the second magnet, and the other end of the second connecting belt is placed inside the housing of the centrifuge and fixedly connected to one end of the second telescopic rod. The other end of the second telescopic rod is fixedly connected to the second end of the photoelectric probe.

[0009] Preferably, the first magnet and the second magnet are magnetically fixed on the outer side wall of the lower box of the centrifuge.

[0010] Preferably, the first magnet and the second magnet are placed in the safety gap between the lower box of the centrifuge and the upper cover of the centrifuge, and the first magnet and the second magnet are magnetically fixed on the lower box of the centrifuge or the upper cover of the centrifuge.

[0011] Preferably, the first magnet includes a first connecting frame and two first magnetic steels. Both of the two first magnetic steels are fixedly arranged on the first connecting frame, and both of the two first magnetic steels can be magnetically fixed outside the rotating space of the centrifuge. One end of the first connecting belt is placed between the two first magnetic steels and fixedly connected to the first connecting frame. The second magnet includes a second connecting frame and two second magnetic steels. Both of the two second magnetic steels are fixedly arranged on the second connecting frame, and both of the two second magnetic steels can be magnetically fixed outside the rotating space of the centrifuge. One end of the second connecting belt is placed between the two second magnetic steels and fixedly connected to the second connecting frame.

[0012] Preferably, the first traction member further includes a first clamping block, and the first clamping block can clamp and fixedly connect one end of the first connecting belt and one end of the first telescopic rod. The second traction member further includes a second clamping block, and the second clamping block can clamp and fixedly connect one end of the second connecting belt and one end of the second telescopic rod.

[0013] Preferably, the first connecting belt is a first stainless steel binding belt, and the second connecting belt is a second stainless steel binding belt.

[0014] Preferably, one end of the first telescopic rod is threadedly connected to the first end of the photoelectric probe; one end of the second telescopic rod is threadedly connected to the second end of the photoelectric probe.

[0015] Preferably, the photoelectric probe includes a photosensitive triode, a photoelectric module, a holding body, a mounting frame, and a socket. The first end of the holding body is fixedly provided on the mounting frame. The holding body is provided with a first mounting hole and a second mounting hole, both of which penetrate from the first end of the holding body to the second end of the holding body. The photosensitive triode is fixedly arranged in the first mounting hole and is placed inside the first end of the holding body. The photoelectric module is fixedly arranged in the second mounting hole. The socket is fixedly arranged on the mounting frame, and the socket is connected to the photosensitive triode and the photoelectric module through wires. A protective cover is fixedly provided on the mounting frame; the mounting frame is fixedly connected to the first end of the first traction member and the first end of the second traction member.

[0016] Preferably, the photoelectric signal conversion amplifier is fixedly arranged inside the mounting frame.

[0017] The utility model has achieved the following technical effects compared with the prior art:

[0018] The sensor assembly for detecting the rotational speed of a centrifuge provided by the utility model is used for detecting the rotational speed of a centrifuge and is matched with a high-precision tachometer host. By arranging the photoelectric probe inside the shell of the centrifuge, the photoelectric probe is firmly supported and fixed by the first traction member and the second traction member. The photoelectric signal conversion amplifier is communicatively connected with the photoelectric probe for current and photoelectric signal transmission. It can be widely applied to the rotational speed measurement and calibration of various medical centrifuges. In particular, it can conveniently and firmly support and install the photoelectric probe inside the centrifuge shells with different structural shapes and sizes, and has strong resistance to vibration and electromagnetic interference, so as to facilitate the realization of high-precision rotational speed measurement and the traceability calibration of rotational speed values. It is convenient to install and use, and the measurement results are reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic diagram of the sensor assembly for detecting the rotational speed of a centrifuge provided by the present utility model;

[0021] Figure 2 is Figure 1 a schematic diagram of the photoelectric probe in

[0022] Figure 3 is Figure 2 another direction schematic diagram of the photoelectric probe in

[0023] In the figure: 1 - photoelectric probe, 2 - first telescopic rod, 3 - first connecting belt, 4 - first permanent magnet, 5 - second telescopic rod, 6 - second connecting belt, 7 - second permanent magnet, 8 - first connecting frame, 9 - second connecting frame, 10 - first clamping block, 11 - second clamping block, 12 - phototransistor, 13 - photoelectric module, 14 - holding body, 15 - mounting frame, 16 - socket, 17 - first mounting hole, 18 - protective cover. Specific embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] The purpose of the present invention is to provide a sensor assembly for detecting the rotational speed of a centrifuge, which can solve the problems existing in the above-mentioned prior art. It can be applicable to the rotational speed detection of centrifuges with an observation hole left on the upper cover or the upper cover made of colorless transparent acrylic material, and can also be applicable to the rotational speed detection of centrifuges without an observation hole on the upper cover or the upper cover made of colored acrylic material.

[0026] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] As Figures 1-3 shown, the present invention provides a sensor assembly for detecting the rotational speed of a centrifuge, including a directional reflective film, a photoelectric probe 1, a photoelectric signal conversion amplifier, and a mounting support frame. The directional reflective film is fixedly adhered to a rotating component inside the centrifuge for detecting the rotational speed of the centrifuge rotor. The photoelectric probe 1 is placed inside the centrifuge housing. The mounting support frame includes a first traction member and a second traction member. The first end of the first traction member is fixedly connected to the first end of the photoelectric probe 1, and the second end of the first traction member is fixedly arranged outside the rotating space of the centrifuge. The first end of the second traction member is fixedly connected to the second end of the photoelectric probe 1, and the second end of the second traction member is fixedly arranged outside the rotating space of the centrifuge. The photoelectric signal conversion amplifier is communicatively connected to the photoelectric probe 1.

[0028] The sensor assembly for detecting the rotational speed of a centrifuge provided by the present utility model is used for detecting the rotational speed of a centrifuge and is matched with a high-precision tachometer host. By arranging the photoelectric probe 1 inside the housing of the centrifuge, the photoelectric probe 1 is firmly supported and fixed through the first traction member and the second traction member. The photoelectric signal conversion amplifier is communicatively connected with the photoelectric probe 1 for current and photoelectric signal transmission. It can be widely applied to the rotational speed measurement and calibration of various medical centrifuges. In particular, it can conveniently and firmly support and install the photoelectric probe 1 inside the centrifuges with different structural shapes and sizes. It has a strong ability to resist vibration and electromagnetic interference, so as to facilitate the realization of high-precision rotational speed measurement and the traceability calibration of rotational speed values. It is convenient to install and use, and the measurement result is reliable. It is traceably calibrated on a high-precision rotational speed standard device with a range of (0 - 60000) r / min, meeting the technical requirements of 0.005 level. Here, it should be noted that the rotating component can be, but is not limited to, the rotor, and can also be a test tube rack or a turntable, as long as it is convenient to paste the directional reflective film.

[0029] As a relatively preferred implementation manner of this embodiment, the first traction member includes a first telescopic rod 2, a first connecting belt 3, and a first magnetic block. The first magnetic block is magnetically fixed outside the rotating space of the centrifuge. One end of the first connecting belt 3 is fixedly connected to the first magnetic block. The other end of the first connecting belt 3 is placed inside the housing of the centrifuge and is fixedly connected to one end of the first telescopic rod 2. The other end of the first telescopic rod 2 is fixedly connected to the first end of the photoelectric probe 1. The second traction member includes a second telescopic rod 5, a second connecting belt 6, and a second magnetic block. The second magnetic block is magnetically fixed outside the rotating space of the centrifuge. One end of the second connecting belt 6 is fixedly connected to the second magnetic block. The other end of the second connecting belt 6 is placed inside the housing of the centrifuge and is fixedly connected to one end of the second telescopic rod 5. The other end of the second telescopic rod 5 is fixedly connected to the second end of the photoelectric probe 1. The first telescopic rod 2 and the second telescopic rod 5 can be telescopically adjusted so that the total length can be changed, meeting the requirements for installing and supporting the photoelectric probe 1 inside the centrifuges with larger and smaller inner diameters.

[0030] As a relatively preferred implementation manner of this embodiment, the first magnetic block and the second magnetic block are magnetically fixed on the outer side wall of the lower box of the centrifuge, which neither affects the opening, closing, locking, and sealing of the upper cover of the centrifuge, nor changes the position of the photoelectric red light at the lower end of the photoelectric probe 1 due to the opening and closing of the upper cover, avoiding the misalignment of the photoelectric probe 1 with the directional reflective film pasted on the rotating component inside the centrifuge, and preferably preventing the influence of the vibration of the centrifuge, ensuring the reliability of speed measurement.

[0031] As a relatively preferred embodiment of this embodiment, the first magnetic block and the second magnetic block are placed in the safety gap between the lower box of the centrifuge and the upper cover of the centrifuge. The first magnetic block and the second magnetic block are magnetically fixed on the lower box of the centrifuge or the upper cover of the centrifuge, which will neither affect the opening, closing, locking and sealing of the upper cover of the centrifuge, nor change the position of the photoelectric red light at the lower end of the photoelectric probe 1 due to the opening and closing of the upper cover, avoiding the misalignment of the photoelectric probe 1 and the directional reflective film pasted on the rotating component inside the centrifuge, and preferably preventing the influence of the vibration of the centrifuge, ensuring the reliability of speed measurement.

[0032] As a relatively preferred embodiment of this embodiment, by adjusting the lengths of the first telescopic rod 2 and the second telescopic rod 5, the first telescopic rod 2 and the second telescopic rod 5 are tightly pressed against the inner wall of the shell of the centrifuge and are lifted by the first connecting belt 3 and the second connecting belt 6. One end of the first connecting belt 3 and the second connecting belt 6 extending out of the rotating space of the centrifuge is firmly attracted to the outer side wall of the lower box of the centrifuge through the first magnetic block and the second magnetic block, which will neither affect the opening, closing, locking and sealing of the upper cover of the centrifuge, nor change the position of the photoelectric red light at the lower end of the photoelectric probe 1 due to the opening and closing of the upper cover, avoiding the misalignment of the photoelectric probe 1 and the directional reflective film pasted on the rotating component inside the centrifuge, and preferably preventing the influence of the vibration of the centrifuge, ensuring the reliability of speed measurement. This original installation support frame more conveniently and effectively solves the problem of speed detection of centrifuges without observation holes in the upper cover or with a colored acrylic upper cover; the first connecting belt 3 and the second connecting belt 6 are preferably made of ultra-thin materials to facilitate the opening, closing, locking and sealing of the upper cover of the centrifuge.

[0033] As a relatively preferred embodiment of this embodiment, the first magnetic block includes a first connecting frame 8 and two first magnetic steels 4. Both of the two first magnetic steels 4 are fixedly arranged on the first connecting frame 8, and both of the two first magnetic steels 4 can be magnetically fixed on the outer wall of the rotating space of the centrifuge. One end of the first connecting belt 3 is placed between the two first magnetic steels 4 and is fixedly connected to the first connecting frame 8; the second magnetic block includes a second connecting frame 9 and two second magnetic steels 7. Both of the two second magnetic steels 7 are fixedly arranged on the second connecting frame 9, and both of the two second magnetic steels 7 can be magnetically fixed on the outer wall of the rotating space of the centrifuge. One end of the second connecting belt 6 is placed between the two second magnetic steels 7 and is fixedly connected to the second connecting frame 9, with stable connection and balanced force; the first magnetic steel 4 and the second magnetic steel 7 are both preferably made of strong magnetic steels.

[0034] As a relatively preferred embodiment of this embodiment, the first traction member further includes a first clamping block 10, and the first clamping block 10 can clamp and fixedly connect one end of the first connecting belt 3 with one end of the first telescopic rod 2; the second traction member further includes a second clamping block 11, and the second clamping block 11 can clamp and fixedly connect one end of the second connecting belt 6 with one end of the second telescopic rod 5. As a relatively preferred embodiment of this embodiment, the first connecting belt 3 is a first stainless steel binding belt, and the second connecting belt 6 is a second stainless steel binding belt; both the first clamping block 10 and the second clamping block 11 are composed of a thick clamping plate and a thin clamping plate, and the thick clamping plate and the thin clamping plate are fastened into one body through screws and screw holes. A thin groove with a width and depth matching the end diameter of the first telescopic rod 2 or the second telescopic rod 5 is opened in the center of the thick clamping plate, so that the end of the first telescopic rod 2 or the second telescopic rod 5 can be installed in the thin groove. A flat groove with a width of 8 mm and a depth of 0.2 mm is opened above the thin groove, so that a first stainless steel binding belt or a second stainless steel binding belt with a width of 8 mm and a thickness of 0.2 mm and an appropriate length (about 100 mm) can be clamped into it, and both the first stainless steel binding belt and the second stainless steel binding belt have short hooks that can be hooked on the first clamping block 10 or the second clamping block 11.

[0035] As a relatively preferred embodiment of this embodiment, one end of the first telescopic rod 2 is threadedly connected to the first end of the photoelectric probe 1; one end of the second telescopic rod 5 is threadedly connected to the second end of the photoelectric probe 1, which is convenient for disassembly and assembly.

[0036] As a relatively preferred embodiment of this embodiment, the photoelectric probe 1 includes a photosensitive triode 12, a photoelectric module 13, a holding body 14, a mounting frame 15, and a socket 16. The first end of the holding body 14 is fixedly arranged on the mounting frame 15. The holding body 14 is provided with a first mounting hole 17 and a second mounting hole. Both the first mounting hole 17 and the second mounting hole penetrate from the first end of the holding body 14 to the second end of the holding body 14. The photosensitive triode 12 is fixedly arranged in the first mounting hole 17. The photosensitive triode 12 is placed inside the first end of the holding body 14. The photoelectric module 13 is fixedly arranged in the second mounting hole. The socket 16 is fixedly arranged on the mounting frame 15. The socket 16 is connected to the photosensitive triode 12 and the photoelectric module 13 through wires. A protective cover 18 is fixedly arranged on the mounting frame 15. The mounting frame 15 is fixedly connected to the first end of the first traction member and the first end of the second traction member. The photoelectric module 13 mainly includes a photoelectric tube, a condenser lens, and a constant current power supply. The outer shell of the photoelectric module 13 is connected to the positive electrode of the photoelectric tube. Insulation measures should be taken to prevent short circuit with the ground. The photoelectric module 13 should be selected with an adjustable condenser focal length. It is not suitable for the condenser point to be too small or too large, and its stability should be ensured. It is most economical and applicable to use a standardized shaped product of a 4mm diameter red photoelectric module 13. The photosensitive triode 12 should be selected with a higher sensitivity to the photoelectric wavelength. Its installation and fixation and lead welding should be correct and reliable. The holding body 14 and the mounting frame 15 can adopt a structure of being made separately and then combined, or can adopt an integrated structure. The specific shapes of the holding body 14 and the mounting frame 15 are not limited. For example, the mounting frame 15 can be square or circular. The holding body 14 and the mounting frame 15 are preferably made of aluminum alloy materials. In this embodiment, the diameter of the first mounting hole 17 is about 3.5mm, the distance from the photosensitive triode 12 to the end face of the second end of the holding body 14 is about 5mm, the diameter of the second mounting hole is about 4mm, and the socket 16 is connected to the photosensitive triode 12 and the photoelectric module 13 through two wires each to effectively prevent the interference of stray light outside the first mounting hole 17.

[0037] As a relatively preferred embodiment of this embodiment, the photoelectric signal conversion amplifier is fixedly arranged in the mounting frame 15. The photoelectric signal conversion amplifier and the photoelectric probe 1 form an integrated structure, which further improves the reliability and is more convenient for installation and use. The photoelectric signal conversion amplifier preferably adopts ultra-small packaged electronic components and a double-sided welded PCB circuit board. Specifically, the principle circuit of the photoelectric signal conversion amplifier can be printed on a PCB circuit board of about three square centimeters. Fixing this PCB circuit board in the mounting frame 15 can obtain the integrated structure of the photoelectric signal conversion amplifier and the photoelectric probe 1.

[0038] As an alternative implementation of this embodiment, the integrated structure of the optoelectronic signal conversion amplifier and the optoelectronic probe 1 can be used outside the centrifuge. It is supported and adsorbed on the outside of the observation hole of the centrifuge cover by a magnetic base. One end of the integrated structure of the optoelectronic signal conversion amplifier and the optoelectronic probe 1 is fastened with a four-wire plug that matches the output socket 16 of the optoelectronic probe 1. Four high-strength single-wire insulated wires and connectors are used as transitions to connect the optoelectronic probe 1 and the input end of the optoelectronic signal conversion amplifier for the transmission of current and optoelectronic signals. A strong and soft latex protection sleeve is tightly sleeved outside the four wires. Align the optoelectronic red light with the directional reflective film on the centrifuge rotor below the observation hole for speed measurement. At this time, there is no need to use an installation support frame and a transition connection. The integrated structure of the optoelectronic signal conversion amplifier and the optoelectronic probe 1 is connected to the host of the speedometer by a three-core shielded cable and connectors.

[0039] As an alternative implementation of this embodiment, the optoelectronic signal conversion amplifier and the optoelectronic probe 1 can also be used separately outside the centrifuge, as long as their normal communication is ensured. Here, it should be noted that when measuring the centrifuge speed outside the centrifuge, how to match the optoelectronic signal conversion amplifier and the optoelectronic probe 1 can be specifically selected according to the actual structural characteristics of the centrifuge to be detected and the actual installation and measurement conditions.

[0040] Here, it should be noted that the geometric tolerance of the structure processing of the installation support frame should be precise, and it should be firm and reliable after assembly. The specific position installed inside the centrifuge should be appropriate. If the centrifuge is small in volume, the pasting position of the directional reflective film should be appropriate, and the distance from the optoelectronic probe 1 should not be too small, so as not to make the reflection enter the "blind area". Attention should also be paid to whether there are rotating parts with strong reflection and possible light interference inside the centrifuge. If so, black tape should be pasted at the corresponding position to eliminate it; when measuring the speed outside the centrifuge, the distance between the optoelectronic probe 1 and the observation hole should be as small as possible to ensure that the optoelectronic red light and the reflected light have sufficient intensity for reliable speed measurement. If necessary, two sets of optoelectronic probes 1 can also be configured. One set of phototubes has a slightly smaller working current and light power (such as 5 mW) for speed measurement at a relatively short distance, and the other set of phototubes has a slightly larger working current and light power (such as 10 mW) for speed measurement at a relatively large distance.

[0041] In this utility model, specific examples are used to elaborate on the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and its core idea of the utility model; at the same time, for those of ordinary skill in the art, according to the idea of the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the utility model.

Claims

1. A sensor assembly for detecting the rotational speed of a centrifuge, characterized in that: It includes a retroreflective film, an optoelectronic probe, an optoelectronic signal conversion amplifier, and a mounting support frame. The retroreflective film is fixedly adhered to a rotating component inside the centrifuge. The optoelectronic probe is placed inside the housing of the centrifuge. The mounting support frame includes a first traction member and a second traction member. The first end of the first traction member is fixedly connected to the first end of the optoelectronic probe. The second end of the first traction member is fixedly provided outside the rotating space of the centrifuge. The first end of the second traction member is fixedly connected to the second end of the optoelectronic probe. The second end of the second traction member is fixedly provided outside the rotating space of the centrifuge. The optoelectronic signal conversion amplifier is communicatively connected to the optoelectronic probe.

2. The sensor assembly for detecting the rotational speed of a centrifuge according to claim 1, wherein: The first traction member includes a first telescopic rod, a first connecting belt, and a first magnetic block. The first magnetic block is magnetically fixed outside the rotating space of the centrifuge. One end of the first connecting belt is fixedly connected to the first magnetic block. The other end of the first connecting belt is placed inside the housing of the centrifuge and fixedly connected to one end of the first telescopic rod. The other end of the first telescopic rod is fixedly connected to the first end of the optoelectronic probe. The second traction member includes a second telescopic rod, a second connecting belt, and a second magnetic block. The second magnetic block is magnetically fixed outside the rotating space of the centrifuge. One end of the second connecting belt is fixedly connected to the second magnetic block. The other end of the second connecting belt is placed inside the housing of the centrifuge and fixedly connected to one end of the second telescopic rod. The other end of the second telescopic rod is fixedly connected to the second end of the optoelectronic probe.

3. The sensor assembly for detecting the rotational speed of a centrifuge according to claim 2, wherein: The first magnetic block and the second magnetic block are magnetically fixed on the outer side wall of the lower box of the centrifuge.

4. The sensor assembly for detecting the rotational speed of a centrifuge according to claim 2, wherein: The first magnetic block and the second magnetic block are placed in the safety gap between the lower box of the centrifuge and the upper cover of the centrifuge, and the first magnetic block and the second magnetic block are magnetically fixed on the lower box of the centrifuge or the upper cover of the centrifuge.

5. The sensor assembly for detecting the rotational speed of a centrifuge according to claim 2, characterized in that: The first magnetic block includes a first connecting frame and two first magnetic steels. Both of the two first magnetic steels are fixedly provided on the first connecting frame. Both of the two first magnetic steels can be magnetically fixed outside the rotating space of the centrifuge. One end of the first connecting belt is placed between the two first magnetic steels and fixedly connected to the first connecting frame. The second magnetic block includes a second connecting frame and two second magnetic steels. Both of the two second magnetic steels are fixedly provided on the second connecting frame. Both of the two second magnetic steels can be magnetically fixed outside the rotating space of the centrifuge. One end of the second connecting belt is placed between the two second magnetic steels and fixedly connected to the second connecting frame.

6. The sensor assembly for detecting the rotational speed of a centrifuge according to claim 2, wherein: The first traction member further includes a first clamping block, and the first clamping block can clamp and fixedly connect one end of the first connecting belt and one end of the first telescopic rod. The second traction member further includes a second clamping block, and the second clamping block can clamp and fixedly connect one end of the second connecting belt and one end of the second telescopic rod.

7. The sensor assembly for detecting the rotational speed of a centrifuge according to claim 2, wherein: The first connecting belt is a first stainless steel binding belt, and the second connecting belt is a second stainless steel binding belt.

8. The sensor assembly for detecting the rotational speed of a centrifuge according to claim 2, wherein: One end of the first telescopic rod is threadedly connected to the first end of the photoelectric probe; one end of the second telescopic rod is threadedly connected to the second end of the photoelectric probe.

9. The sensor assembly for detecting the rotational speed of a centrifuge according to claim 1, characterized in that: The photoelectric probe includes a photosensitive triode, a photoelectric module, a holding body, a mounting frame, and a socket. The first end of the holding body is fixedly provided on the mounting frame. A first mounting hole and a second mounting hole are formed in the holding body. Both the first mounting hole and the second mounting hole penetrate from the first end of the holding body to the second end of the holding body. The photosensitive triode is fixedly provided in the first mounting hole. The photosensitive triode is placed inside the first end of the holding body. The photoelectric module is fixedly provided in the second mounting hole. The socket is fixedly provided on the mounting frame. The socket is connected to the photosensitive triode and the photoelectric module through wires. A protective cover is fixedly provided on the mounting frame. The mounting frame is fixedly connected to the first end of the first traction member and the first end of the second traction member.

10. The sensor assembly for detecting the rotational speed of a centrifuge according to claim 9, wherein: The photoelectric signal conversion amplifier is fixedly provided inside the mounting frame.

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