A dual speed centrifuge speed monitoring device

Abstract

The utility model discloses a double -speed centrifugal speed monitoring devices, double -speed centrifugal release device includes: the speed component, double -speed centrifugal device, trigger block device, support frame, electromagnetic coil, sensor, double -speed centrifugal device includes casing, low -speed centrifugal block, high -speed centrifugal block, low -speed centrifugal block, high -speed centrifugal block arrangement in the casing of double -speed centrifugal device speed component, can be in the stop state and in the locomotive operation control electromagnetic coil on -off electricity switch trigger block device dial lever position selects double -speed centrifugal device's low -speed centrifugal block overspeed trigger or double -speed centrifugal device's high -speed centrifugal block overspeed trigger, and sensor real -time delivery is low -speed centrifugal block overspeed trigger or high -speed centrifugal block overspeed trigger signal.

Description

Technical Field

[0001] This utility model relates to the field of online centrifugal speed monitoring, and in particular to a dual-speed centrifugal speed monitoring device. Background Technology

[0002] Mechanical centrifugal speed monitoring technology, as a safety guarantee method for online speed monitoring and instantaneous feedback signals of overspeed, is widely used in many industries, such as mechanical overspeed protection for monorail cranes in coal mines. However, most currently used mechanical centrifugal speed monitoring technologies are single devices that can only be set to one monitoring speed, which cannot meet the needs of some working conditions that require two monitoring speeds. For example, monorail cranes need to use different operating speeds for light and heavy load conditions, otherwise it will affect the efficiency and safety of the locomotive operation. A few dual-speed centrifugal speed monitoring devices can be set to two monitoring speeds, but the devices themselves have high processing and manufacturing precision requirements, cannot complete the switching between high-speed and low-speed monitoring speed values ​​during locomotive operation, and dual-speed centrifugal devices are not easy to disassemble and assemble on site, making it inconvenient to perform monitoring accuracy verification on site. Developing a dual-speed centrifugal speed monitoring device with lower processing and manufacturing precision requirements, convenient on-site disassembly and assembly, and the ability to complete the switching between high-speed and low-speed monitoring speed values ​​during locomotive operation can better meet the user's needs for dual-speed centrifugal speed monitoring devices. Summary of the Invention

[0003] To address the aforementioned shortcomings in the existing technology, this utility model provides a dual-speed centrifugal speed monitoring device. It employs a combination of a trigger block device and a dual-speed centrifugal device, enabling the switching of the trigger block device lever position during locomotive operation to select between overspeed triggering of the low-speed centrifugal block and overspeed triggering of the high-speed centrifugal block. Furthermore, it is easy to process and manufacture, thus overcoming the deficiencies of the existing technology.

[0004] To achieve the aforementioned objectives, the technical solution adopted by this utility model is as follows:

[0005] A dual-speed centrifuge speed monitoring device for online speed monitoring and instantaneous feedback of overspeed signals includes: a speed acquisition component, a dual-speed centrifuge device, a trigger block device, a support frame, an electromagnetic coil, and a sensor;

[0006] The dual-speed centrifuge device includes: a shell, a centrifuge rod, a speed-regulating spring, centrifuge block I, a set screw, a connecting plate, a centrifuge block II, a cover plate, a speed-regulating nut, and a locking screw; the speed-regulating nut and locking screw consist of four pieces; the shell has two sets of threaded through holes, and the four speed-regulating nuts are respectively assembled in the threaded through holes; the centrifuge rod, centrifuge block I, set screw, and centrifuge block II consist of two pieces, and the speed-regulating spring and connecting plate consist of four pieces; centrifuge block I and centrifuge block II have through holes, and centrifuge block II also has a threaded hole perpendicular to the through hole; the centrifuge rod passes through the through hole of centrifuge block I and centrifuge block II; the set screw passes through the through hole on the centrifuge rod and is fastened in the threaded hole of centrifuge block II; speed-regulating springs are respectively assembled in the holes of centrifuge block I and centrifuge block II; the two ends of the centrifuge rod pass through the speed-regulating springs; one connecting plate is assembled on each end face of centrifuge block I and centrifuge block II; one centrifuge block I, one centrifuge block II, one centrifuge rod, two set screws, and two speed-regulating springs; The connecting plate forms a centrifugal assembly; the two centrifugal rods, centrifugal block I, set screws, centrifugal block II, four speed-adjusting springs, and the connecting plate are divided into two groups, each group forming one centrifugal assembly, for a total of two centrifugal assemblies. The two centrifugal assemblies are respectively assembled in two pairs of speed-adjusting nut holes, and the four speed-adjusting springs are distributed between the speed-adjusting nuts and centrifugal block I, and between the speed-adjusting nuts and centrifugal block II; the two centrifugal assemblies are calibrated with different monitoring speed values, thus dividing the two centrifugal assemblies into one high-speed centrifugal assembly and one low-speed centrifugal assembly, with the low-speed centrifugal assembly assembled near the cover plate; when the housing rotates, the centrifugal rods of the two centrifugal assemblies are each thrown outward with centrifugal block II under the combined action of the centrifugal forces of centrifugal block I and centrifugal block II; the monitoring speed values ​​of the high-speed centrifugal assembly and the low-speed centrifugal assembly are adjusted by rotating the four speed-adjusting nuts respectively, and after the monitoring speed values ​​of the two centrifugal assemblies are calibrated, the four locking screws are respectively locked to the four adjusting nuts.

[0007] The dual-speed centrifugal device is assembled on the speed-taking shaft of the speed-taking component and rotates together with the speed-taking shaft.

[0008] The trigger block device and speed-taking component are assembled on the trigger block mounting plate on the support frame via pins and nuts. The speed-taking component, lever, and pressure block can rotate around the pin. The spring is assembled between the lever and the pressure block, and the pressure cap is assembled on the lever. The pressure block has a limit groove, and one end of the lever is inserted into the limit groove of the pressure block. The lever can slide within the limit groove of the pressure block along the axis of the pin. When the lever rotates, it drives the pressure block to rotate synchronously. The lever screw and lever nut are assembled on the lever. When the dual-speed centrifugal speed monitoring device is working, the lever screw presses down the valve's start switch.

[0009] The electromagnetic coil is assembled on a coil mounting plate on a support frame. The movable pin passes through the hole in the coil mounting plate and contacts and interacts with the pressure cover of the trigger block device. The lever can move away from or towards the movable pin under the combined action of the movable pin force and the spring force through the pressure cover.

[0010] When the dual-speed centrifuge device rotates, both the high-speed and low-speed centrifuge blocks are simultaneously thrown outwards by centrifugal force. The electromagnetic coil is not energized, and the lever is positioned near the electromagnetic coil under the action of the spring. The lever can be over-triggered by both the high-speed and low-speed centrifuge blocks. When the dual-speed centrifuge device reaches the low-speed trigger speed value first, the low-speed centrifuge block over-triggers the lever, causing the pressure block to rotate. The lever screw releases the pressure on the valve, and the valve releases, transmitting an over-speed signal. When the electromagnetic coil is energized, the movable pin pushes the pressure cap, causing the lever to overcome the spring resistance and move away from the electromagnetic coil. The lever is in a position away from the electromagnetic coil, and it can only be over-triggered by the high-speed centrifuge block. When the dual-speed centrifuge device reaches the high-speed trigger speed value, the high-speed centrifuge block over-triggers the lever, causing the pressure block to rotate. The lever screw releases the pressure on the valve, and the valve releases, transmitting an over-speed signal.

[0011] The sensor is assembled on the coil mounting plate. When the electromagnetic coil is not energized, the lever is positioned close to the electromagnetic coil under the action of the spring. The sensor senses the lever transmitting an overspeed trigger signal that the lever can be triggered by the low-speed centrifugal module of the dual-speed centrifuge device. That is, the dual-speed centrifuge speed monitoring device monitors whether the rotation speed of the dual-speed centrifuge device has reached the low-speed trigger speed value. After the electromagnetic coil is energized, the movable pin pushes the pressure cover, causing the lever to overcome the resistance of the spring and move away from the electromagnetic coil. When the lever is in a position away from the electromagnetic coil, the sensor does not sense the lever transmitting an overspeed trigger signal that the lever can only be triggered by the high-speed centrifugal module of the dual-speed centrifuge device. That is, the dual-speed centrifuge speed monitoring device monitors whether the rotation speed of the dual-speed centrifuge device has reached the high-speed trigger speed value.

[0012] The dual-speed centrifuge speed monitoring device removes the electromagnetic coil and sensor and adds a manual switcher, thus the dual-speed centrifuge speed monitoring device is a manually switchable dual-speed centrifuge speed monitoring device; the manual switcher has a self-locking function.

[0013] The beneficial effects of this utility model are as follows:

[0014] The combination of trigger block device and dual-speed centrifugal device to realize online speed monitoring and instantaneous trigger feedback of overspeed signal is a brand-new design concept that simplifies complex problems and makes them easier to implement.

[0015] The dual-speed centrifugal speed monitoring device allows for easy switching between overspeed triggering of the low-speed centrifugal module and overspeed triggering of the high-speed centrifugal module, and also reduces the processing and manufacturing precision requirements of the dual-speed centrifugal speed monitoring device.

[0016] The dual-speed centrifuge unit is assembled on the speed-taking shaft, which is convenient for disassembly and assembly, and facilitates on-site monitoring and accuracy verification of the dual-speed centrifuge unit.

[0017] The high-speed centrifugal module and the low-speed centrifugal module inside the housing of the dual-speed centrifugal device work simultaneously. The low-speed centrifugal module is arranged near the cover. When the electromagnetic coil is de-energized, the low-speed centrifugal module is triggered to monitor the locomotive running speed value for overspeed, which has high reliability.

[0018] The electromagnetic coil switching dual-speed centrifugal speed monitoring device can control the electromagnetic coil to select and switch between high-speed centrifugal module overspeed trigger and low-speed centrifugal module overspeed trigger during locomotive operation. The sensor transmits the real-time information of whether the dual-speed centrifugal device has reached the low-speed trigger speed value or the high-speed trigger speed value. Attached Figure Description

[0019] Figure 1 This is a front view of a dual-speed centrifugal velocity monitoring device according to the present invention;

[0020] Figure 2 This is a left view of a dual-speed centrifugal velocity monitoring device according to the present invention;

[0021] Figure 3 This is a cross-sectional view of the dual-speed centrifuge device of this utility model;

[0022] Figure 4 This is a schematic diagram of the centrifugal module of this utility model;

[0023] Figure 5 This is a schematic diagram of the trigger block device of this utility model;

[0024] Figure 6 This is a schematic diagram of the manual switcher of this utility model;

[0025] Figure 7 This is a schematic diagram of the high-low speed manual switching dual-speed centrifuge speed monitoring device of this utility model;

[0026] Appendix Label Reference Table:

[0027] 1-Speed-taking component, 1-1 Speed-taking shaft, 1-2 Bearing, 1-3 Through cover, 1-4 Screw, 1-5 Spacer, 1-6 Speed-taking wheel, 1-7 Speed-taking frame, 2-Dual-speed centrifuge device, 2-1 Housing, 2-2 Centrifuge rod, 2-3 Speed-adjusting spring, 2-4 Centrifuge block I, 2-5 Set screw, 2-6 Connecting plate, 2-7 Centrifuge block II, 2-8 Cover plate, 2-9 Speed-adjusting nut, 2-10 Locking screw, 3-Trigger block device, 3-1 Lever, 3-2 Lever screw, 3-3 Lever nut, 3-4 Pressure block, 3-5 Spring, 3-6 Cover, 3-7 Valve, 3-8 Pin, 3-9 Nut, 4-Support frame, 4-1 Base plate, 4-2 Trigger block mounting plate, 4-3 Coil mounting plate, 4-4 Support plate, 5-Electromagnetic coil, 6-Sensor, 7-Manual switcher, 7-1 Seat, 7-2 Rotating shaft. Detailed Implementation

[0028] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0029] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0030] To make the content of this utility model easier to understand, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0031] like Figure 1 , Figure 2 As shown: A dual-speed centrifuge speed monitoring device includes: a speed acquisition component 1, a dual-speed centrifuge device 2, a trigger block device 3, a support frame 4, an electromagnetic coil 5, and a sensor 6;

[0032] The speed-taking component 1 includes: a speed-taking shaft 1-1, a bearing 1-2, a through cover 1-3, a screw 1-4, a spacer 1-5, a speed-taking wheel 1-6, and a speed-taking frame 1-7; the speed-taking wheel 1-6 is assembled on the speed-taking shaft 1-1, and the speed-taking shaft 1-1 is assembled on the speed-taking frame 1-7 via the bearing 1-2, the through cover 1-3, the spacer 1-5, and the screw 1-4;

[0033] like Figure 3 , Figure 4As shown: The dual-speed centrifuge device 2 includes: a housing 2-1, a centrifuge rod 2-2, a speed-regulating spring 2-3, a centrifuge block I 2-4, a set screw 2-5, a connecting plate 2-6, a centrifuge block II 2-7, a cover plate 2-8, a speed-regulating nut 2-9, and a locking screw 2-10; the speed-regulating nut 2-9 and the locking screw 2-10 are four pieces; the housing 2-1 has two sets of threaded through holes, and the four speed-regulating nuts 2-9 are respectively assembled in the threaded through holes; the centrifuge rod 2-2, the centrifuge block I 2-4, the set screw 2-5, and the centrifuge block II 2-7 are two pieces, and the speed-regulating spring 2-3 and the connecting plate 2-6 are four pieces. The centrifuge blocks I2-4 and II2-7 have through holes, and centrifuge block II2-7 also has a threaded hole perpendicular to the through hole. A centrifuge rod 2-2 passes through the through holes of centrifuge blocks I2-4 and II2-7. A set screw 2-5 passes through the through hole on centrifuge rod 2-2 and is fastened in the threaded hole of centrifuge block II2-7. Speed ​​regulating springs 2-3 are respectively assembled in the holes of centrifuge blocks I2-4 and II2-7. Both ends of centrifuge rod 2-2 pass through speed regulating springs 2-3. A connecting plate 2-6 is assembled on each end face of centrifuge blocks I2-4 and II2-7. Centrifuge block II 2-7, centrifuge rod 2-2, set screw 2-5, two speed-regulating springs 2-3, and connecting plate 2-6 form one centrifuge assembly; the two centrifuge rods 2-2, centrifuge block I 2-4, set screw 2-5, centrifuge block II 2-7, four speed-regulating springs 2-3, and connecting plate 2-6 are divided into two groups, each group forming one centrifuge assembly, for a total of two centrifuge assemblies. The two centrifuge assemblies are respectively assembled in the holes of two pairs of speed-regulating nuts 2-9, and the four speed-regulating springs 2-3 are distributed between the speed-regulating nuts 2-9 and centrifuge block I 2-4, and between the speed-regulating nuts 2-9 and centrifuge block II 2-7; the two centrifuge assemblies... The two centrifuge blocks are divided into one high-speed centrifuge block and one low-speed centrifuge block, with the low-speed centrifuge block assembled near the cover plate 2-8, based on the different calibrated monitoring speed values. When the housing 2-1 rotates, the centrifuge rods 2-2 of the two centrifuge blocks are thrown outward along with centrifuge block II 2-7 under the combined action of the centrifugal forces of centrifuge block I 2-4 and centrifuge block II 2-7. The monitoring speed values ​​of the high-speed centrifuge block and the low-speed centrifuge block are adjusted by rotating the four speed-adjusting nuts 2-9 respectively. After the monitoring speed values ​​of the two centrifuge blocks are calibrated, the four locking screws 2-10 lock the four adjusting nuts 2-9 respectively.

[0034] The dual-speed centrifugal device 2 is assembled on the speed-taking shaft 1-1 and rotates together with the speed-taking shaft 1-1.

[0035] like Figure 2 , Figure 5As shown, the trigger block device 3 includes: a lever 3-1, a lever screw 3-2, a lever nut 3-3, a pressure block 3-4, a spring 3-5, a pressure cap 3-6, a valve 3-7, a pin 3-8, and a nut 3-9. The support frame 4 includes: a base plate 4-1, a trigger block mounting plate 4-2, a coil mounting plate 4-3, and a support plate 4-4. The trigger block device 3 and the speed-taking component 1 are assembled on the trigger block mounting plate 4-2 via the pin 3-8 and the nut 3-9. The speed-taking component 1, the lever 3-1, and the pressure block 3-4 can surround the pin 3-8. -8 rotates, the spring 3-5 is assembled between the lever 3-1 and the pressure block 3-4, the pressure cover 3-6 is assembled on the lever 3-1, the pressure block 3-4 has a limiting groove, one end of the lever 3-1 is inserted into the limiting groove of the pressure block 3-4, the lever 3-1 can slide within the limiting groove of the pressure block 3-4 along the axis of the pin 3-7, when the lever 3-1 rotates, it drives the pressure block 3-4 to rotate synchronously; the lever screw 3-2 and the lever nut 3-3 are assembled on the lever 3-1, when the dual-speed centrifugal speed monitoring device is working, the lever screw 3-2 presses the start switch of the valve 3-7.

[0036] The electromagnetic coil 5 includes a coil body 5-1 and a movable pin 5-2. The electromagnetic coil 5 is assembled on the coil mounting plate 4-3. The movable pin 5-2 passes through the hole in the coil mounting plate 4-3 and contacts and interacts with the cover 3-6 of the trigger block device 3.

[0037] When the dual-speed centrifuge device 3 rotates, the high-speed and low-speed centrifuge blocks in the dual-speed centrifuge device 3 are simultaneously thrown outward by centrifugal force. The electromagnetic coil 5 is not energized, and the lever 3-1 is positioned close to the electromagnetic coil 5 under the action of the spring 3-5. The lever 3-1 can be over-triggered by the high-speed and low-speed centrifuge blocks. When the rotation speed of the dual-speed centrifuge device 3 first reaches the low-speed trigger speed value, the low-speed centrifuge block over-triggers the lever 3-1, causing the pressure block 3-4 to rotate. The lever screw 3-2 releases the pressure on the valve 3-7, and the valve 3... -7 releases and transmits an overspeed signal; the electromagnetic coil 5 is energized, and the movable pin 5-2 pushes the pressure cover 3-6 to drive the lever 3-1 to overcome the resistance of the spring 3-5 and move away from the electromagnetic coil. The lever 3-1 is in a position away from the electromagnetic coil. The lever 3-1 can only be triggered by the high-speed centrifugal block overspeed. When the speed of the dual-speed centrifugal device 3 reaches the high-speed trigger speed value, the high-speed centrifugal block overspeed trigger lever 3-1 drives the pressure block 3-4 to rotate. The lever screw 3-2 releases the pressure on the valve 3-7, and the valve 3-7 releases and transmits an overspeed signal.

[0038] The sensor 6 is assembled on the coil mounting plate 4-3. When the electromagnetic coil 5 is not energized, the lever 3-1 is in a position close to the electromagnetic coil under the action of the spring 3-3. The sensor 6 senses the signal transmitted by the lever 3-1 that the dual-speed centrifugal speed monitoring device is monitoring whether the speed of the dual-speed centrifugal device 3 has reached the low-speed trigger speed value. After the electromagnetic coil 5 is energized, the movable pin 5-2 pushes the pressure cover 3-6 to drive the lever 3-1 to overcome the resistance of the spring 3-3 and move away from the electromagnetic coil. When the lever 3-1 is in a position away from the electromagnetic coil, the sensor 6 can no longer sense the signal transmitted by the lever 3-1 that the dual-speed centrifugal speed monitoring device is monitoring whether the speed of the dual-speed centrifugal device 3 has reached the high-speed trigger speed value.

[0039] like Figure 6 , Figure 7 As shown, the dual-speed centrifuge speed monitoring device removes the electromagnetic coil 5 and sensor 6, and adds a manual switcher 7. The dual-speed centrifuge speed monitoring device is a manually switchable dual-speed centrifuge speed monitoring device. The manual switcher 7 includes: a base 7-1 and a rotating shaft 7-2. The base 7-1 has a hole in the middle and two grooves of different depths that cross at 90°. The rotating shaft 7-2 has a short shaft. When the short shaft rotates into the shallow groove and presses down the cover plate 3-6, the lever 3-1 can only be triggered by the high-speed centrifuge block at overspeed. The dual-speed centrifuge speed monitoring device monitors whether the rotation speed of the dual-speed centrifuge device 3 reaches the high-speed trigger speed value. When the short shaft rotates into the deep groove, the lever 3-1 is in a position close to the manual switcher 7 under the action of the spring 3-3. The lever 3-1 can be triggered by the high-speed centrifuge block and the low-speed centrifuge block at overspeed. The dual-speed centrifuge speed monitoring device monitors whether the rotation speed of the dual-speed centrifuge device 3 reaches the low-speed trigger speed value.

[0040] The above description is only a preferred embodiment of this utility model patent and is not intended to limit this utility model patent. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model patent should be included within the protection scope of this utility model patent.

Claims

1. A dual-speed centrifuge velocity monitoring device for online velocity monitoring and instantaneous feedback of overspeed signals, characterized in that, include: Speed ​​acquisition component, dual-speed centrifugal device, trigger block device, support frame, electromagnetic coil, sensor; The dual-speed centrifuge device includes: a shell, a centrifuge rod, a speed-regulating spring, centrifuge block I, a set screw, a connecting plate, centrifuge block II, a cover plate, a speed-regulating nut, and a locking screw; the centrifuge block II, centrifuge rod, set screw, and centrifuge block I are two pieces, and the connecting plate and speed-regulating spring are four pieces; the two centrifuge blocks II, centrifuge rod, set screw, and centrifuge block I, along with the four connecting plates and speed-regulating springs, are divided into two groups, each group forming one centrifuge block, for a total of two centrifuge blocks; the two centrifuge blocks are calibrated with different monitoring speed values, thus dividing the two centrifuge blocks into one high-speed centrifuge block and one low-speed centrifuge block; the two centrifuge blocks are assembled inside the shell, with the low-speed centrifuge block assembled near the cover plate; The speed-taking component includes: a speed-taking shaft, a bearing, a through cover, screws, a spacer, a speed-taking wheel, and a speed-taking frame; The dual-speed centrifugal device is assembled on the speed-taking shaft of the speed-taking component. When the dual-speed centrifugal device rotates together with the speed-taking shaft, the two centrifugal blocks are simultaneously thrown outward under the action of their respective centrifugal forces. The trigger assembly includes: a lever, a lever screw, a lever nut, a pressure block, a spring, a pressure cap, a valve, a pin, and a nut; the valve is assembled on the speed take-off frame; The trigger block device and the speed-taking component are assembled on the support frame by a pin and a nut. The speed-taking component, the lever, and the pressure block can rotate around the pin of the trigger block device. The spring is assembled between the lever and the pressure block. The pressure cover is assembled on the lever. The pressure block has a limit groove. One end of the lever is inserted into the limit groove of the pressure block. The lever can slide within the limit groove of the pressure block along the axis of the pin. When the lever rotates, it drives the pressure block to rotate synchronously. The lever screw is assembled on the lever. When the dual-speed centrifugal speed monitoring device is working, the lever screw presses down on the valve's start switch. When the dual-speed centrifugal device overspeeds, the lever is triggered to drive the pressure block to rotate synchronously, and the lever screw releases the pressure on the valve and transmits an overspeed signal. The electromagnetic coil is assembled on the coil mounting plate. The movable pin passes through the hole in the coil mounting plate and contacts and interacts with the cover of the trigger block device. The lever can move away from or towards the movable pin under the combined action of the movable pin force and the spring force through the cover. The sensor is assembled on a coil mounting plate and senses the position of the lever.

2. The dual-speed centrifuge velocity monitoring device according to claim 1, characterized in that: When the dual-speed centrifuge device rotates, the electromagnetic coil is not energized, and the lever can be over-triggered by both the high-speed and low-speed centrifuge blocks. When the electromagnetic coil is energized, the lever can only be over-triggered by the high-speed centrifuge block.

3. The dual-speed centrifuge velocity monitoring device according to claim 1, characterized in that: When the electromagnetic coil is not energized, the sensor senses that the lever transmits an overspeed trigger signal for the low-speed centrifugal module selected by the dual-speed centrifugal speed monitoring device. When the electromagnetic coil is energized, the sensor no longer senses that the lever transmits an overspeed trigger signal for the high-speed centrifugal module selected by the dual-speed centrifugal speed monitoring device.

4. The dual-speed centrifuge velocity monitoring device according to claim 1, characterized in that: The dual-speed centrifuge speed monitoring device removes the electromagnetic coil and sensor and adds a manual switcher, thus the dual-speed centrifuge speed monitoring device is a manually switchable dual-speed centrifuge speed monitoring device.

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