Power supply device for shaft power measurement and shaft power measurement system

Abstract

The invention relates to the technical field of ship shaft power measurement, in particular to a power supply device for shaft power measurement and a shaft power measurement system.The power supply device for shaft power measurement is provided with a remote control unit, a lithium battery, a switch, a receiver circuit board and an output end, the switch is turned on before a host starts, the receiver circuit board is in a standby state, and the output end is turned on; and the receiver circuit board consumes less power when in standby. After the host starts and accelerates to a test working condition, the receiver circuit board is in an on state through the remote control unit, and the battery voltage is output to the transmitter through the output end to supply power to the transmitter. The method avoids the excessive loss of the electric quantity of the lithium battery in the period from the starting of the host to the reaching of the test working condition, guarantees the long-term flexible power supply and use of the battery, reduces the stopping times of the host, guarantees the smooth operation of the test, and reduces the trial run period and test cost.

Description

Technical Field

[0001] The present invention relates to the technical field of ship shaft power measurement, and in particular to a power supply device for shaft power measurement and a shaft power measurement system. Background Art

[0002] The output power of ship diesel engines is an important operating parameter of ship mechanical power, an important part of mechanical quantity measurement, and the fundamental guarantee of ship navigation power. Therefore, testing shaft power is an essential means to check whether the output power of various ship diesel engines and hull performance meet the design indicators. If the shaft power can be measured accurately, reliably and conveniently, we can have a more intuitive understanding of the working condition of the diesel engine. At the same time, it is of great significance to the evaluation of the design and construction quality of ships, engines and propellers.

[0003] At present, the main engine propulsion shaft power measurement test is carried out in the main engine adjustment test, durability load test, fuel consumption and gas consumption measurement test, and speed and energy efficiency test of the trial ship. Among them, an important component of the shaft power measurement system is the transmitter power supply device, which is mainly a lithium battery installed on the propulsion intermediate shaft system. The power supply time of the lithium battery is generally about two days, while the shaft power measurement test is generally about ten days. When the lithium battery is out of power, it is necessary to apply for the main engine to stop, replace the lithium battery and restart the engine. The main engine starts and accelerates to the test condition, and the entire process takes about three hours. In addition, the test must be continuous and have strict time assessment. The test in progress before the main engine stops can only be scrapped and the measurement must be restarted. At the same time, the application for parking must also be based on the captain's safety control of the nearby sea area. All these processes will seriously affect the progress of the test.

[0004] During the test, the lithium battery will rotate with the shaft, and the existing power supply device cannot be turned on after the host is started, so the lithium battery needs to be turned on before the host is started. The entire process of accelerating the host from the start to the test condition takes about three hours, which will greatly waste the working power of the lithium battery, increase the number of host stops, and thus extend the trial period and increase the test cost. Summary of the invention

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a power supply device for shaft power measurement and a shaft power measurement system, which is used to solve the problem that the power supply device in the prior art needs to turn on the power supply before the main engine is started, resulting in a waste of electricity, increasing the number of main engine shutdowns, thereby extending the trial period and increasing the test cost.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides a power supply device for measuring shaft power, wherein the power supply device includes a protective shell, a switch and an output end arranged on the protective shell, a lithium battery and a receiver circuit board arranged in the protective shell, and a remote control unit. The lithium battery is electrically connected to the switch and the receiver circuit board, the switch is used to control the on-off of the circuit between the lithium battery and the receiver circuit board, the receiver circuit board is used to control the output of the battery voltage, the receiver circuit board is electrically connected to the output end, the output end is used to connect to a transmitter to output the battery voltage to the transmitter, and the remote control unit is electrically connected to the receiver circuit board to control the on-off of the receiver circuit board.

[0007] Optionally, the power supply device further includes a charging port, which is disposed on the protective shell and is electrically connected to the lithium battery.

[0008] Optionally, the power supply device further comprises a receiver fixing plate, and the receiver circuit board is fixedly arranged on the receiver fixing plate;

[0009] A fixing block is fixedly arranged on the receiver fixing plate, a screw hole is opened on the fixing block, and a screw hole is correspondingly opened on the side wall of the protective shell. The fixing block is fixedly connected to the protective shell by screws penetrated through the screw holes.

[0010] Optionally, the protective shell includes a mounting frame and a left baffle and a right baffle respectively detachably connected to two ends of the mounting frame, and a sliding track is provided on the inner side wall of the mounting frame, and the sliding track can be slidably matched with the receiver fixing plate.

[0011] The present invention also provides a shaft power measurement system, comprising any one of the above-mentioned power supply device, speed signal acquisition unit, torque signal acquisition unit, collector and computer, wherein the power supply device, the speed signal acquisition unit, the torque signal acquisition unit, the collector and the computer are electrically connected, the power supply device is used to power the torque signal acquisition unit, the speed signal acquisition unit is used to collect the speed signal of the intermediate shaft system, the torque signal acquisition unit is used to collect the torque signal of the intermediate shaft system, the collector is used to collect the speed signal and the torque signal and feed them back to the computer, and the computer is used to calculate the shaft power data.

[0012] Optionally, the speed signal acquisition unit includes equally divided magnetic steel and an electromagnetic sensor, the equally divided magnetic steel is evenly attached to the surface of the intermediate shaft system, the probe of the electromagnetic sensor is arranged vertically corresponding to the equally divided magnetic steel, and the output end of the electromagnetic sensor is connected to the collector.

[0013] Optionally, the torque signal acquisition unit includes a transmitter, a strain gauge and a receiver, the strain gauge is attached to the surface of the intermediate shaft system, each pin of the strain gauge is electrically connected to the transmitter, the transmitter is electrically connected to the power supply device and the receiver, respectively, and the receiver is also electrically connected to the collector.

[0014] Optionally, the strain gauge is attached to the surface of the intermediate shaft system at an angle of 45 degrees along the direction of the intermediate shaft system.

[0015] Optionally, the power supply device and the transmitter bottom are adhered to the surface of the intermediate shaft system, and the power supply device and the transmitter are also fixed to the intermediate shaft system through a throat clamp and a sealing tape is wrapped around the periphery of the throat clamp.

[0016] Optionally, the strain gauge is covered with silicone rubber.

[0017] In a power supply device for measuring shaft power and a shaft power measurement system of the present invention, a remote control unit, a lithium battery, a switch, a receiver circuit board and an output terminal are provided. Before the host is started, the switch is turned on to put the receiver circuit board in a standby state. The power consumption of the receiver circuit board is relatively small when in standby state. After the host is started and accelerated to the test condition, the receiver circuit board is turned on by the remote control unit, and the battery voltage is output to the transmitter through the output terminal to power the transmitter. This avoids excessive loss of lithium battery power during the period from the start of the host to the reaching of the test condition, ensures long-term and flexible power supply use of the battery, reduces the number of host shutdowns, thereby ensuring the smooth progress of the test and reducing the trial period and test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a power supply device according to an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a receiver fixing plate and a fixing block in one embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a remote control unit in one embodiment of the present invention;

[0021] Figure 4 is a principle block diagram of a shaft power measurement system according to an embodiment of the present invention;

[0022] Figure 5 is a connection principle diagram of a shaft power measurement system according to an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of a fixed structure of a power supply device and a transmitter in one embodiment of the present invention;

[0024] Figure 7is a schematic diagram of a strain gauge pasting method in one embodiment of the present invention;

[0025] Figure 8 is a schematic diagram of a strain gauge circuit in one embodiment of the present invention;

[0026] Fig. 9 1 is a schematic diagram of a bridge in one embodiment of the present invention. DETAILED DESCRIPTION

[0027] Refer to the following Figures 1 to 9 To describe a power supply device for shaft power measurement and a shaft power measurement system of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0028] Unless otherwise clearly defined and limited, the terms "set", "install", "connect", "connect", "fix", "couple" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0029] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of the present embodiment, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0031] like Figure 1-Figure 3 As shown, an embodiment of the present invention provides a power supply device for shaft power measurement. The power supply device includes a protective shell, a switch 12 and an output terminal 15 arranged on the protective shell, a lithium battery 14 and a receiver circuit board 13 arranged in the protective shell, and a remote control unit 16. The lithium battery 14 is electrically connected to the switch 12 and the receiver circuit board 13. The protective shell plays a role in protecting internal components. The switch 12 is used to control the circuit on and off of the lithium battery 14 and the receiver circuit board 13, so that the receiver circuit board 13 is in a standby state or an off state. The receiver circuit board 13 is used to control the output of the battery voltage. The receiver circuit board 13 is electrically connected to the output terminal 15, and the output terminal 15 is used to connect to the transmitter to output the battery voltage to the transmitter to power the transmitter. The remote control unit 16 is used to control the on and off of the receiver circuit board 13 when the receiver circuit board 13 is in a standby state, thereby controlling the operation of the transmitter.

[0032] Before the host starts, the switch 12 is turned on to put the receiver circuit board 13 in a standby state. The receiver circuit board 13 consumes less power when in standby state. After the host starts and accelerates to the test condition, the receiver circuit board 13 is turned on through the remote control unit 16, and the battery voltage is output to the transmitter through the output terminal 15, so that the transmitter is in a running state for subsequent wireless signal transmission. After the test is over, the receiver circuit board 13 is turned off again through the remote control unit 16, and the output terminal 15 stops the voltage output. When the test is performed again, the above switch 12 is cycled to control the lithium battery 14 to supply power to the transmitter. By setting the remote control unit 16, the lithium battery 14, the switch 12, the receiver circuit board 13 and the output terminal 15, it is possible to realize that the transmitter is powered when the host starts and accelerates to the test condition, avoiding excessive power loss of the lithium battery 14 during the period from the start of the host to the test condition, ensuring long-term and flexible power supply of the battery, reducing the number of host parking times, thereby ensuring the smooth progress of the test, and reducing the trial period and test cost.

[0033] Optionally, considering the high-speed rotation of the shaft system and the influence of centrifugal force, the size of the lithium battery 14 is 65mm long, 55mm wide, 35mm high, and the capacity of the lithium battery 14 is 4400mA, and the size of the receiver circuit board 13 is 50mm long, 30mm wide, and 15mm high.

[0034] Optionally, the remote control unit 16 is a remote controller, and the remote control unit 16 includes a main body 163 and an on button 161 and an off button 162 provided on the main body 163 .

[0035] Furthermore, the power supply device also includes a charging port 17, which is disposed on the protective housing and electrically connected to the lithium battery 14. The lithium battery 14 can be charged through the charging port 17, thereby increasing the battery life of the lithium battery 14, reducing the replacement of the lithium battery 14, and making the test operation simpler.

[0036] Further, the power supply device further includes a receiver fixing plate 21, and the receiver circuit board 13 is fixedly disposed on the receiver fixing plate 21. The receiver circuit board 13 is fixedly disposed inside the protective housing through the receiver fixing plate 21. Optionally, the receiver circuit board 13 is adhered to the receiver fixing plate 21 by double-sided adhesive.

[0037] Furthermore, a fixing block 22 is fixedly arranged on the receiver fixing plate 21, and a screw hole 23 is provided on the fixing block 22. A screw hole 23 is correspondingly provided on the side wall of the protective shell, and the fixing block 22 is fixedly connected to the protective shell by screws passing through the screw holes 23, thereby realizing the fixing connection of the receiver fixing plate 21 in the protective shell, and the structure is relatively simple.

[0038] Furthermore, the protective shell is a rectangular hollow structure as a whole. Optionally, the size of the protective shell is 110 mm long, 70 mm wide, and 45 mm high.

[0039] Furthermore, the protective housing includes a mounting frame 111 and a left baffle 112 and a right baffle 113 respectively detachably connected to the two ends of the mounting frame 111. A sliding track 114 is provided on the inner side wall of the mounting frame 111, and the sliding track 114 can slide with the receiver fixing plate 21. When installing the receiver circuit board 13, the receiver fixing plate 21 can be pushed into the mounting frame 111 along the sliding track 114. In order to show the internal structure of the protective housing, Figure 1 It is a schematic diagram of the structure with the top of the installation frame 111 removed.

[0040] Optionally, screw holes 23 are provided at the four corners of the left baffle 112 and the right baffle 113, and corresponding screw holes 23 are also provided on the installation frame 111. The left baffle 112 and the right baffle 113 are detachably fixedly connected to the installation frame 111 by screws passing through the screw holes 23.

[0041] Optionally, the lithium battery 14 is arranged near the right baffle 113, and the receiver circuit board 13 is arranged near the left baffle 112. The fixing block 22 is fixedly connected to the left baffle 112 by screws. The switch 12, the output terminal 15 and the charging port 17 are all arranged on the left baffle 112.

[0042] When assembling the power supply device, first fix the receiver fixing plate 21 to the left baffle 112 through the fixing block 22, then push the lithium battery 14 into the installation frame 111 near the right baffle 113, and push the receiver circuit board 13 into the installation frame 111 near the left baffle 112 along the sliding track 114, and finally fix the left baffle 112 and the right baffle 113 to the two ends of the installation frame 111 respectively by screws. The operation is simple.

[0043] like Figure 4-Figure 6 As shown, the present invention also provides a shaft power measurement system, including the power supply device 1, the speed signal acquisition unit, the torque signal acquisition unit, the collector 5 and the computer 6 in any of the above embodiments. The power supply device 1, the speed signal acquisition unit, the torque signal acquisition unit, the collector 5 and the computer 6 are electrically connected. The power supply device 1 is used to power the torque signal acquisition unit, the speed signal acquisition unit is used to collect the speed signal of the intermediate shaft system 7, and the torque signal acquisition unit is used to collect the torque signal of the intermediate shaft system 7. The speed signal acquisition unit and the torque signal acquisition unit transmit the collected shaft speed signal and torque signal to the collector 5 respectively, and the collector 5 feeds back to the computer 6, and the computer 6 can obtain the shaft power data through calculation. By setting the power supply device 1, the long-term and flexible power supply for the torque signal acquisition unit is guaranteed, thereby ensuring the smooth completion of the shaft power test project.

[0044] Optionally, the computer 6 is a portable computer, and the collector 5 is connected to the computer 6 via a serial line.

[0045] Specifically, for a diesel engine, the calculation formula between shaft power, speed and torque is as follows:

[0046] N e =(M e ×ω)=(M e ×2πn / 60)*0.1047=(M e ×n)*0.1047;

[0047] Among them, N e is the output power of the diesel engine, kW; M e is the output torque of the diesel engine, kN.m; ω is the crankshaft angular velocity, radians / second; n is the diesel engine speed, r / min.

[0048] Furthermore, the speed signal acquisition unit includes an equally divided magnetic steel 31 and an electromagnetic sensor 32. The equally divided magnetic steel 31 is evenly attached to the surface of the intermediate shaft system 7. The probe of the electromagnetic sensor 32 is arranged vertically corresponding to the equally divided magnetic steel 31, and the output end of the electromagnetic sensor 32 is connected to the collector 5. When the intermediate shaft system 7 rotates, the electromagnetic sensor 32 receives the magnetic induction pulse signal on the equally divided magnetic steel 31 and feeds it back to the collector 5, and then the collector 5 and the computer 6 process the magnetic induction pulse signal and calculate the speed information.

[0049] Specifically, the calculation formula of the rotation speed is:

[0050]

[0051] Wherein, N is the number of pulses received in 1 second; M is the number of equally divided magnetic steels 31 installed on the intermediate shaft system 7.

[0052] Furthermore, the torque signal acquisition unit includes a transmitter 42, a strain gauge 41 and a receiver 43. The strain gauge 41 is attached to the surface of the intermediate shaft system 7. Each pin of the strain gauge 41 is electrically connected to the transmitter 42, and the transmitter 42 is electrically connected to the power supply device 1 and the receiver 43 respectively. The receiver 43 is also electrically connected to the collector 5. When collecting the torque signal, the strain gauge 41 converts the strain of the intermediate shaft system 7 into a change in the resistance of the strain gauge 41, and outputs a voltage signal to the transmitter 42. The transmitter 42 transmits the output voltage signal to the receiver 43, and the receiver 43 receives and amplifies the voltage signal and transmits it to the collector 5, and uses the computer 6 to calculate the torque information.

[0053] Specifically, refer to Figure 7-Figure 9 , the calculation principle of the output voltage of the strain gauge 41 is:

[0054] If the resistance R of the resistance wire is formula (1-1):

[0055] R=ρ.L / A

[0056] Where R is the resistance value, Ω; ρ is the resistivity; L is the length of the resistance wire, mm; A is the cross-sectional area of ​​the resistance wire, mm 2 .

[0057] Any change in any parameter will cause a change in resistance. Taking the derivative, we get formula (1-2):

[0058]

[0059] Substituting formula (1-1) into formula (1-2), we get formula (1-3):

[0060]

[0061] In addition, εy =-με x , where ε x is the relative axial deformation of the resistance wire, or longitudinal strain; ε y It is the relative radial deformation of the resistance wire, or transverse strain.

[0062] Substituting formula (1-2) into formula (1-3) yields formula (1-4):

[0063]

[0064] Where μ is the Poisson coefficient of the material; (1+2μ)ε x The change of resistance value caused by the change of geometric size of the resistance wire; The change in resistance value caused by the change in resistivity of the resistance wire.

[0065] For metal materials, the resistivity is almost constant, so

[0066]

[0067] For a DC bridge, the output voltage U 0 for:

[0068]

[0069] Assume that the bridge is initially balanced, that is: R 1 =R 2 =R 3 =R 4 =R, R 1 R 3 =R 2 R 4 At this time, U 0 =0.

[0070] If the resistance value of each strain changes slightly, ΔR 1 , ΔR 2 , ΔR 3 , ΔR 4 , the voltage at the output of the bridge changes. Since ΔR<<R, the voltage output measured by the full-bridge circuit is:

[0071]

[0072] The formula for calculating torque based on output voltage is:

[0073]

[0074] Where: D i D is the inner diameter of the shaft, mm; o is the shaft outer diameter, mm; E is the tensile strength, MPa; GF is the strain gauge sensitivity coefficient; G XMT is the gain; N is the number of bridge arms; T FS (Nm) is the measured torque; V EXC is the bridge excitation voltage, V; V FS is the output voltage, V; μ is the Poisson coefficient.

[0075] Optionally, the strain gauge 41 adopts a single-piece full-bridge strain gauge. The strain gauge 41 is attached to the surface of the intermediate shaft system 7 at 45 degrees along the direction of the intermediate shaft system 7, and the strain generated by the maximum stress related to the torque can be directly measured, making the measurement signal more obvious and improving the sensitivity and accuracy of the measurement. The strain gauge 41 is attached to the surface of the intermediate shaft system 7 with 502 glue. Before attaching the strain gauge 41, the surface of the intermediate shaft system 7 is cleaned with sandpaper and acetone.

[0076] Optionally, the bottom of the power supply device 1 and the transmitter 42 are attached to the surface of the intermediate shaft system 7 for preliminary fixation. Double-sided adhesive tape can be used for attachment. The power supply device 1 and the transmitter 42 are also fixed to the intermediate shaft system 7 through a throat hoop 44 and a sealing tape is wrapped around the throat hoop 44 to further fix the power supply device 1 and the transmitter 42.

[0077] Optionally, the strain gauge 41 is also covered with silicone rubber to prevent oil pollution.

[0078] In summary, when conducting the shaft power measurement test, first turn on the switch to put the receiver circuit board in standby mode. At this time, the lithium battery is in low power consumption mode. Then the host starts the car. During the process of starting the host, the receiver circuit board is always in standby mode, and the lithium battery is in low power consumption mode, thereby greatly reducing the power loss of the lithium battery. When the host starts to the test condition, the receiver circuit board is turned on by the on button on the remote control. At this time, there is voltage output at the output end, and the transmitter 42 is in operation, and wireless signal transmission can be performed. The strain gauge 41 converts the strain of the intermediate shaft system 7 into a change in the resistance of the strain gauge 41, and outputs a voltage signal to the transmitter 42. The transmitter 42 then sends the voltage signal to the receiver 43, and the receiver 43 collects and amplifies the voltage signal and outputs it to the collector 5. The collector 5 feeds back the voltage signal to the computer 6 to obtain torque information. The electromagnetic sensor 32 receives the magnetic induction pulse signal on the equally divided magnetic steel 31, and feeds it back to the collector 5 and the computer 6, and then uses the computer 6 to process and calculate the magnetic induction pulse signal to obtain the speed information. Finally, the computer 6 can calculate the shaft power data according to the torque information and the speed information, and record and save the shaft power data under various working conditions. After the test is over, just press the off button on the remote control to disconnect the receiver circuit board and stop the voltage output at the output end. When the test is repeated, the above switch actions are cycled, and the purpose of effectively controlling the lithium battery to supply power to the transmitter 42 is finally achieved, ensuring the long-term and flexible use of the battery, reducing the number of host shutdowns, thereby ensuring the smooth progress of the test and reducing the trial period and test costs.

[0079] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A power supply device for measuring shaft power, characterized in that: The power supply device includes a protective shell, a switch and an output end arranged on the protective shell, a lithium battery and a receiver circuit board arranged in the protective shell, and a remote control unit. The lithium battery is electrically connected to the switch and the receiver circuit board. The switch is used to control the on-off of the circuit between the lithium battery and the receiver circuit board. The receiver circuit board is used to control the output of the battery voltage. The receiver circuit board is electrically connected to the output end. The output end is used to connect to a transmitter to output the battery voltage to the transmitter. The remote control unit is electrically connected to the receiver circuit board to control the on-off of the receiver circuit board.

2. The power supply device for measuring shaft power according to claim 1, characterized in that: The power supply device also includes a charging port, which is arranged on the protective shell and is electrically connected to the lithium battery.

3. The power supply device for measuring shaft power according to claim 1, characterized in that: The power supply device further comprises a receiver fixing plate, and the receiver circuit board is fixedly arranged on the receiver fixing plate; A fixing block is fixedly arranged on the receiver fixing plate, a screw hole is opened on the fixing block, and a screw hole is correspondingly opened on the side wall of the protective shell. The fixing block is fixedly connected to the protective shell by screws penetrated through the screw holes.

4. The power supply device for measuring shaft power according to claim 3, characterized in that: The protective shell includes a mounting frame and a left baffle and a right baffle which are detachably connected to two ends of the mounting frame respectively. A sliding track is provided on the inner side wall of the mounting frame, and the sliding track can be slidably matched with the receiver fixing plate.

5. A shaft power measurement system, characterized in that: It comprises a power supply device, a speed signal acquisition unit, a torque signal acquisition unit, a collector and a computer as described in any one of claims 1 to 4, wherein the power supply device, the speed signal acquisition unit, the torque signal acquisition unit, the collector and the computer are electrically connected, the power supply device is used to power the torque signal acquisition unit, the speed signal acquisition unit is used to collect the speed signal of the intermediate shaft system, the torque signal acquisition unit is used to collect the torque signal of the intermediate shaft system, the collector is used to collect the speed signal and the torque signal and feed them back to the computer, and the computer is used to calculate the shaft power data.

6. The shaft power measurement system according to claim 5, characterized in that: The speed signal acquisition unit includes equally divided magnetic steel and an electromagnetic sensor. The equally divided magnetic steel is evenly attached to the surface of the intermediate shaft system. The probe of the electromagnetic sensor is arranged vertically corresponding to the equally divided magnetic steel. The output end of the electromagnetic sensor is connected to the collector.

7. The shaft power measurement system according to claim 5, characterized in that: The torque signal acquisition unit includes a transmitter, a strain gauge and a receiver. The strain gauge is attached to the surface of the intermediate shaft system. Each pin of the strain gauge is electrically connected to the transmitter. The transmitter is electrically connected to the power supply device and the receiver respectively. The receiver is also electrically connected to the collector.

8. The shaft power measurement system according to claim 7, characterized in that: The strain gauge is attached to the surface of the intermediate shaft system at 45 degrees along the direction of the intermediate shaft system.

9. The shaft power measurement system according to claim 7, characterized in that: The bottom of the power supply device and the transmitter are adhered to the surface of the intermediate shaft system. The power supply device and the transmitter are also fixed to the intermediate shaft system through a throat clamp and a sealing tape is wrapped around the outer periphery of the throat clamp.

10. The shaft power measurement system according to claim 7, characterized in that: The strain gauge is covered with silicone rubber.

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