CN211452699U

CN211452699U - Axial force on-line monitoring sensing device suitable for shaft coupling bolt of hydroelectric generating set

Info

Publication number: CN211452699U
Application number: CN202020212948.4U
Authority: CN
Inventors: 张猛; 郭靖; 杜芝鹏
Original assignee: Dongfang Electric Machinery Co Ltd DEC
Current assignee: Dongfang Electric Machinery Co Ltd DEC
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2020-09-08
Anticipated expiration: 2030-02-26

Abstract

The utility model belongs to the field of bolt axial force online monitoring, in particular to an axial force online monitoring sensing device suitable for a coupling bolt of a hydroelectric generating set, which mainly comprises a force measuring sensing device, a fixing device and a power supply device; the force measuring sensing device comprises a sensing probe and a signal processing unit which are connected through a communication cable, the sensing probe is arranged at the head of the coupling bolt body, and one sensing probe is correspondingly arranged on one coupling bolt body; the fixing device comprises a fixing base used for arranging the signal processing unit and an annular protecting cover concentrically arranged with the main shaft, and the fixing base is connected with the signal processing unit and arranged on the annular protecting cover. This technical scheme uses the annular protecting cover to be used for setting up dynamometry sensing device power supply unit as the mounting bracket, does not change the connection structure originally of hydroelectric set main shaft, does not also change the component structure of shaft coupling bolt body self, has realized monitoring simultaneously and the real-time supervision to shaft coupling bolt axial force to a plurality of shaft coupling bolt bodies.

Description

Axial force on-line monitoring sensing device suitable for shaft coupling bolt of hydroelectric generating set

Technical Field

The utility model belongs to bolt axial force on-line monitoring field, concretely relates to axial force on-line monitoring sensing device suitable for hydroelectric set coupling bolt.

Background

The fasteners such as the bolts, the studs and the like are widely applied to the fields of railway bridges, water conservancy and hydropower, wind power, nuclear power, transportation, aerospace and the like, and due to the complex and various working environments, the bolts generally need to bear adverse factors such as large impact load, temperature change, vibration, environmental corrosion and the like, and the comprehensive action of the adverse factors easily causes the connection failure of the fasteners, so that the axial force change or the defect of the fasteners is found in advance, and the fastener has important significance for ensuring the safe and stable operation of equipment, prolonging the service life of the equipment and the like.

The working state of a coupling bolt (or a coupling stud, hereinafter collectively referred to as a coupling bolt) of the water turbine generator set is important for the safe and stable operation of the whole set. If the pretightening force of the coupling bolt is insufficient, the pretightening force is too large or the pretightening force is not uniform, the connection reliability is possibly reduced, the fatigue damage of a fastener and the stability of a shafting are possibly reduced, even abnormal vibration of a unit is possibly caused in severe cases, the breakage accident of a rotating wheel of a rotating part and a main shaft coupling bolt occurs in the operation process of an individual unit, and the fault cannot be found in time due to the fact that an effective bolt axial force is lacked in a power station, so that a workshop is flooded, and a lot of unnecessary loss is caused.

Currently, the main types of real-time stress monitoring sensors for fasteners include load washers, fiber optic sensors, or ultrasonic load cells, and are often used in situations where the connected component is in a static state. When the water turbine generator set operates, the coupling bolt is in a high-speed rotating state along with the main shaft, so that the common stress monitoring sensor is difficult to be used on a rotating part of the water turbine generator set, and a large risk is brought to safe and stable operation of the set. In the prior art, there is a technical scheme of embedding a stress sensor inside a bolt, for example, the utility model patent document with the publication number of CN203962622U, the publication date of 2014, 11 and 26, and the name of "a screw with a stress sensor" includes a screw body and a stress sensor, wherein the screw body is provided with a through hole in the middle of a nut, an internal thread is arranged on the lower part of the nut and the through hole of a screw rod, the inner part of the upper part of the nut is smooth, and an external thread is arranged outside the screw rod; a double-cap screw is arranged in the screw body, a nut at the top of the double-cap screw is provided with a notch, threads are arranged on the periphery of the nut, a polygonal groove is formed in the top of the double-cap screw, threads are arranged on the periphery of the nut at the bottom of the double-cap screw, and a stress sensor mounting groove is formed in the middle of a screw rod of the double-cap; the stress sensor is mounted in the stress sensor mounting groove, and the wire passes through the notch of the top nut to be linked with the outside. This technical scheme has destroyed the original structure of screw, has further influenced the bearing stress characteristic of screw itself, has also increased the risk that unit junction became invalid, cracked.

Disclosure of Invention

An object of the utility model is to prior art not enough, provide the axial force on-line monitoring sensing device who is applicable to hydroelectric set coupling bolt, through set up annular protecting cover on the main shaft, the annular protects and covers the dynamometry sensing device who sets up the coupling bolt body to the protecting cover sets up sensing probe as the mounting bracket at the head of coupling bolt body, under the condition that does not change coupling bolt body original structure, realizes the on-line monitoring to coupling bolt axial force.

The method is realized by the following technical scheme:

axial force on-line monitoring sensing device suitable for hydroelectric set coupling bolt, including main shaft and the coupling bolt body that is used for connecting the main shaft, its characterized in that: the device also comprises a force measuring sensing device, a fixing device and a power supply device for supplying power to the force measuring sensing device; based on the working form of the rotation of the main shaft of the water turbine generator set, the winding of the electric wire is avoided, a device on the main shaft cannot be externally connected with a power supply, and preferably, the power supply device is a rechargeable storage battery or a high-performance dry battery; the fixing device is used for fixing the force measurement sensing device and the power supply device, so that the risk that the force measurement sensing device and the power supply device are loosened or fall off from the spindle due to the influence of centrifugal force when the spindle rotates is avoided to the greatest extent, and the stability of the whole device is improved. The coupling bolt body comprises a head part and a connecting part, an annular flange bulge for the connecting part of the coupling bolt body to penetrate is arranged on the main shaft, the annular flange bulge is concentric with the main shaft and integrated with the main shaft, so that the stable connection of the main shaft is ensured, the distribution of the coupling bolt body is facilitated, and the annular flange bulge is a main shaft flange and used as a connection foundation of the main shaft; the coupling bolt bodies are arranged on the annular flange protrusions at equal intervals around the main shaft so as to balance the balance force borne by the main shaft when the main shaft rotates. The fixing device comprises a fixing base and an annular protecting cover which is concentric with the main shaft; the fixing base is used for accommodating and fixing the power supply device and part of the components in the force measuring sensing device. The annular protecting cover, the main shaft and the annular flange bulge are matched with each other to form an annular inner cavity concentric with the main shaft, and the head of the coupling bolt body is positioned in the annular inner cavity; one end of the fixed base is arranged on the annular protective cover, and the other end of the fixed base is provided with a cover plate corresponding to the fixed base; the cover plate, the annular protecting cover and the fixed base are matched with each other to form a closed cavity, and the power supply device is arranged in the closed cavity; the force measuring sensing device comprises a communication cable, a signal processing unit and a plurality of sensing probes arranged at the head of the coupling bolt body, and one sensing probe is correspondingly arranged on one coupling bolt body; the signal processing unit is arranged in the closed cavity, a threading hole is formed in the closed cavity, one end of the communication cable is connected with the sensing probe, and the other end of the communication cable penetrates through the threading hole to be connected into the signal processing unit. The signal processing unit is composed of a plurality of modules, and the signal processing refers to the acquisition, conversion, temporary storage and uploading of signals monitored by the sensing probe. This technical scheme does not change the original connection structure of main shaft, does not also change the shape structure of coupling bolt body self, through setting up annular protecting cover and corresponding fixed knot structure, realizes dynamometry sensing device's installation, has contained in the dynamometry sensing device and has had collection, conversion, integrated operation, temporary storage and upload functional signal processing unit, and operating personnel can extract data as required at any time, has realized the on-line monitoring to coupling bolt body stress.

The ultrasonic bolt force measurement can realize nondestructive monitoring of bolt axial force, and is an optimal bolt axial force monitoring mode, so that preferably, the signal processing unit comprises a network cable, an industrial personal computer, an ultrasonic host and a deconcentrator which are sequentially connected through the network cable, and the sensing probe is connected with the deconcentrator through a communication cable. The ultrasonic wave host is an ultrasonic wave signal generator, the ultrasonic wave generator can monitor the working frequency and power of the ultrasonic wave system, and in addition, the ultrasonic wave generator can also adjust various parameters (such as power, frequency, running time and the like) in real time according to different requirements of users, so that the ultrasonic wave generator plays a vital role in signal acquisition in the technical scheme. An Industrial Personal Computer (IPC), i.e. an Industrial control Computer, has important Computer attributes and features (such as a Computer motherboard, a CPU, a hard disk, a memory, peripherals and interfaces), and has an operating system, a control network, a protocol and computing power. The force measuring and sensing device is provided with a plurality of sensing probes, each sensing probe corresponds to one communication cable, and an interface for connecting the communication cable with the ultrasonic host is limited, so that a deconcentrator is arranged between the ultrasonic host and the sensing probes.

The closed cavity comprises a fixed base, an annular protecting cover and a cover plate, a power supply device and a signal processing unit are further arranged in the closed cavity, all the structures are arranged together, the weight is larger, in order to balance the centrifugal force borne by the main shaft during rotation as much as possible, two identical closed cavities are preferably arranged on the annular protecting cover, and the two closed cavities are respectively positioned at two ends of one radial diameter of the main shaft; the signal processing unit is divided into two parts which are respectively arranged in the two closed cavities, for example: the power supply device and the industrial personal computer are arranged in one sealed cavity, and the ultrasonic host and the deconcentrator are arranged in the other sealed cavity.

In order to reduce the influence of centrifugal force as much as possible, the fixed base is arranged at one end of the annular protecting cover close to the main shaft, and the fixed base is positioned outside the annular inner cavity in order to facilitate the installation and the disassembly of the power supply device and the force measuring sensing device. The annular protecting cover is provided with a plurality of through holes for the communication cables to pass through, the through holes are located above the head of the coupling bolt body, one is arranged above the sensing probe corresponding to one through hole, the structure standardizes the drawing mode of the communication cables, the distribution of the communication cables is neat and attractive, and if the force measuring sensing device breaks down, the fault point can be quickly found. The utility model discloses a communication cable, including communication cable, sensing probe, fixed plug screw, communication cable, fixed plug screw is equipped with and is used for preventing that communication cable from rocking fixed plug screw, and communication cable passes and connects sensing probe after perforating, and fixed plug screw is rotatory to be inserted in the perforation, has avoided communication cable to receive under the effect of centrifugal force and has dragged, has increased communication cable's life, has further increased dynamometry sensing device's stability and reliability.

The structure size of the fixed base is designed to be matched with the signal processing unit and is designed to be a pressing plate structure, so that the power supply device and the signal processing unit are prevented from being damaged due to collision when rotating along with the main shaft of the unit; the fixing base is provided with a mounting hole, the cover plate is connected with the fixing base, the fixing base is connected with the annular protecting cover through a screw and/or a pin, the pin is arranged at one end of the fixing base, which is far away from the main shaft, so as to resist centrifugal force, and the number and the specification of the screw and the pin are determined according to the centrifugal force borne by the fixing base, the force measuring sensing device and the power supply device; the apron with the fixed baseplate contact surface, and fixed baseplate with annular protecting cover contact surface is provided with the sealing member for dustproof, waterproof, grease proofing fog.

The axial cross section of the annular protecting cover is of an inverted L-shaped structure, the annular protecting cover of the structure comprises a plane, a fixed base is convenient to mount, a force measuring sensing device and a power supply device are convenient to arrange, and a closed cavity is convenient to form.

The fixing device further comprises a cable clamp, and a screw is arranged on the cable clamp; the cable clamp is matched with the screw for fixing the communication cable on the annular protective cover, so that the communication cable is further prevented from being pulled by centrifugal force, and the stability and the reliability of the force measurement sensing device are improved.

In order to facilitate charging or replacement of the power supply device or overhaul and maintenance of the signal processing unit, the cover plate needs to be installed and detached regularly, and the cover plate is provided with the handle, so that the cover plate is convenient to disassemble and assemble.

The utility model has the advantages that:

according to the technical scheme, the main shaft is provided with the annular protecting cover which is positioned above the head of the coupling bolt body, the annular protecting cover is used as an installation frame for arranging a force measuring sensing device power supply device, the original connection structure of the main shaft of the water turbine generator set is not changed, the self structure of the coupling bolt body is not changed, the force measuring sensing device comprises a plurality of sensing probes, each sensing probe corresponds to one coupling bolt body, and the simultaneous monitoring or polling monitoring of a plurality of coupling bolt bodies is realized; the force measurement sensing device also comprises a signal processing unit which is used for acquiring and converting signals detected by the sensing probe in real time, temporarily storing the signals after integrated operation, and wirelessly transmitting the signals in real time or periodically uploading the signals to specified equipment as required, so that the real-time monitoring of the axial force of the coupling bolt is realized; the technical scheme is also provided with a fixing device, so that the stability and the reliability of the force measuring and sensing device are improved, and the influence of environmental factors such as centrifugal force generated when the main shaft of the water turbine generator set rotates is well overcome; the technical scheme has the advantages of simple structure, easy realization, convenient disassembly and assembly, neat distribution, and convenient troubleshooting and periodic maintenance.

Drawings

The foregoing and following detailed description of the invention will be apparent when read in conjunction with the following drawings, in which:

FIG. 1 is a schematic view of the main structure of the present invention;

FIG. 2 is an enlarged schematic view of the local part A of the present invention;

FIG. 3 is an enlarged schematic view of the local part B of the present invention;

FIG. 4 is a schematic structural plane distribution diagram of the present invention;

FIG. 5 is an enlarged schematic view of the local C of the present invention;

FIG. 6 is a schematic view of a cable clamp configuration;

in the figure:

1. a main shaft; 2. a coupling bolt body; 2.1, a head; 2.2, a connecting part; 3. a force sensing device; 3.1, a signal processing unit; 3.2, communication cables; 3.3, a sensing probe; 4. a fixing device; 4.1, fixing a base; 4.2, an annular protecting cover; 4.3, cable clamps; 4.4, screws; 4.5, a pin; 5. a power supply device; 6. an annular flange projection; 7. An annular inner cavity; 8. a cover plate; 9. sealing the cavity; 10. perforating; 11. threading holes; 12. a handle; 13. fixing the screw plug; 14. and a seal.

Detailed Description

The technical solution for achieving the objectives of the present invention will be further described by using several specific examples, and it should be noted that the technical solution claimed in the present invention includes, but is not limited to, the following examples.

Example 1

The embodiment discloses an axial force on-line monitoring and sensing device suitable for a coupling bolt of a water-turbine generator set, and the device is used as a basic implementation scheme of the utility model, and comprises a main shaft 1, a coupling bolt body 2 used for connecting the main shaft 1, a force measuring sensing device 3, a fixing device 4 and a power supply device 5 used for providing a power supply for the force measuring sensing device 3; the coupling bolt body 2 comprises a head part 2.1 and a connecting part 2.2, and an annular flange bulge 6 for the connecting part 2.2 of the coupling bolt body 2 to penetrate is arranged on the main shaft 1; the annular flange bulge 6 is concentric with the main shaft 1 and is integrated with the main shaft 1; the plurality of coupling bolt bodies 2 are arranged on the annular flange bulge 6 at equal intervals around the main shaft 1; the fixing device 4 comprises a fixing base 4.1 and an annular protecting cover 4.2 which is arranged concentrically with the main shaft 1; the annular protecting cover 4.2, the main shaft 1 and the annular flange bulge 6 are matched with each other to form an annular inner cavity 7 concentric with the main shaft 1, and the head 2.1 of the coupling bolt body 2 is positioned in the annular inner cavity 7; one end of the fixed base 4.1 is arranged on the annular protecting cover 4.2, and the other end of the fixed base 4.1 is provided with a cover plate 8 corresponding to the fixed base 4.1; the cover plate 8, the annular protecting cover 4.2 and the fixed base 4.1 are mutually matched to form a closed cavity 9, and the power supply device 5 is arranged in the closed cavity 9; the force measuring sensing device 3 comprises a communication cable 3.2, a signal processing unit 3.1 for collecting, converting, temporarily storing and uploading signals, and a plurality of sensing probes 3.3 arranged at the head 2.1 of the coupling bolt body 2, wherein one sensing probe 3.3 is correspondingly arranged on one coupling bolt body 2; the signal processing unit 3.1 is arranged in the closed cavity 9, a threading hole 11 is formed in the closed cavity 9, one end of the communication cable 3.2 is connected with the sensing probe 3.3, and the other end of the communication cable 3.2 penetrates through the threading hole 11 to be connected into the signal processing unit 3.1.

The rotating speed range of the main shaft 1 of the water turbine generator set is large, from dozens of revolutions per minute to hundreds of revolutions per minute, and the coupling bolt force measuring sensing device 3 of the water turbine generator set needs to rotate along with the main shaft 1, so that real-time shaft force monitoring on the coupling bolt of the water turbine generator set is a big problem in the field. According to the technical scheme, the fixing device 4 comprising the annular protecting cover 4.2 is arranged on the main shaft 1, the annular protecting cover 4.2 is used as an installation support, the force measuring sensing device 3 is arranged and installed by being attached to the annular protecting cover 4.2, the original connecting structure of the main shaft 1 of the water turbine generator set is not changed, and the self composition structure of the coupling bolt body 2 is not changed; one coupling bolt body 2 is arranged corresponding to one sensing probe 3.3, so that a plurality of coupling bolt bodies 2 can be monitored simultaneously; the signal processing unit 3.1 included in the force measurement sensing device 3 realizes real-time acquisition and conversion of signals detected by the sensing probe 3.3, temporarily stores the signals after integrated operation, and wirelessly transmits or periodically transmits the signals to designated equipment in real time as required, if the signals can be directly transmitted to a cloud end in real time in a wireless transmission mode, the cloud end comprises a public cloud, a private cloud and a local area network server, so that the real-time monitoring of the axial force of the coupling bolt is realized, the information temporarily stored in the signal processing unit 3.1 can be called at any time through an upper computer, and basic information of the coupling bolt body 2 and the hydroelectric generating set is calculated and evaluated on line by utilizing the information, wherein the basic information can comprise axial water thrust of the set, fatigue life of the coupling bolt, shafting arrangement condition of the set, abnormal vibration and the like; the information temporarily stored in the signal processing unit 3.1 is transferred, so that detailed original analysis information can be provided for fault diagnosis of the water-turbine generator set, and quantitative scientific basis is provided for safe operation, scientific overhaul and fault diagnosis of a power station. Fixed baseplate 4.1 is used for accomodating and fixed signal processing unit 3.1 and power supply unit 5, avoid signal processing unit 3.1 and power supply unit 5 to be dragged by centrifugal force, it is not hard up or drop from annular protecting cover 4.2, form airtight cavity 9 behind the setting protecting cover, prevent into water and influence signal processing unit 3.1 and power supply unit 5's normal work, the stability and the reliability of device have been increased, it can rotate along with main shaft 1 to have realized making dynamometry sensing device 3.

Example 2

The embodiment discloses an axial force on-line monitoring and sensing device suitable for a shaft coupling bolt of a water turbine generator set, which is taken as a preferred embodiment of the utility model, namely, in the embodiment 1, a signal processing unit 3.1 comprises a network cable, and an industrial personal computer, an ultrasonic host and a deconcentrator which are sequentially connected through the network cable; the sensing probe 3.3 is connected with the deconcentrator through a communication cable 3.2; the axial cross section of the annular protecting cover 4.2 is in an inverted L-shaped structure; the annular protecting cover 4.2 is provided with two identical closed cavities 9, and the two closed cavities 9 are respectively positioned at two ends of one radial diameter of the main shaft 1; the signal processing unit 3.1 is divided into two parts which are respectively arranged in the two closed cavities 9; the fixing device 4 further comprises a cable clamp 4.3, and a screw 4.4 is arranged on the cable clamp 4.3; the cable clamp 4.3 cooperates with the screw 4.4 for fixing the telecommunication cable 3.2 to the annular protective cover 4.2.

In the technical scheme, the ultrasonic bolt force measurement can realize nondestructive monitoring on the bolt axial force, and is a preferred bolt axial force monitoring mode, so that an industrial personal computer, an ultrasonic host and a deconcentrator are preferably arranged in the signal processing unit 3.1; the industrial personal computer has important computer attributes and characteristics, and has the functions of signal conversion, integrated operation, data storage, information uploading and the like required by the technical scheme; the ultrasonic host can monitor the working frequency and power of the high-power ultrasonic system, and adjust various parameters in real time according to different requirements of users, and the ultrasonic host has an automatic frequency following function, once the equipment completes initial setting, the equipment can continuously operate, so that the signal processing unit 3.1 plays a vital role in acquiring signals in an optimal state in the technical scheme; the setting of deconcentrator has compensatied the not enough drawback of ultrasonic wave host computer interface, provides the condition for realizing monitoring simultaneously a plurality of shaft coupling bolt bodies 2. The shape of the annular protecting cover 4.2 in the scheme is convenient to process, the installation of the fixed base 4.1 is convenient, and the closed cavities 9 for accommodating the power supply device 5 and the signal processing unit 3.1 are also convenient to form, the two closed cavities 9 are symmetrically arranged at two ends of one radial diameter of the main shaft 1, so that the centrifugal force generated when the main shaft 1 rotates is balanced; set up the cable clamp on the annular protecting cover 4.2, avoided communication cable 3.2 to receive centrifugal force to drag, increased the life of signal cable, also increased dynamometry sensing device 3's stability and reliability.

Example 3

The embodiment discloses an axial force on-line monitoring and sensing device suitable for a shaft coupling bolt of a water-turbine generator set, and serves as a preferred embodiment of the utility model, namely in the embodiment 2, a fixed base 4.1 is arranged at one end of an annular protecting cover 4.2 close to a main shaft 1 and is positioned outside an annular inner cavity 7; the annular protecting cover 4.2 is provided with a plurality of through holes 10 for the communication cable 3.2 to pass through, the through holes 10 are positioned above the head 2.1 of the coupling bolt body 2, and one sensing probe 3.3 corresponds to one through hole 10; one end of the communication cable 3.2 close to the sensing probe 3.3 is sleeved with a fixed screw plug 13 for preventing the communication cable 3.2 from shaking, the communication cable 3.2 is connected with the sensing probe 3.3 after passing through the through hole 10, and the fixed screw plug 13 is rotatably inserted into the through hole 10; the cover plate 8 is connected with the fixed base 4.1, and the fixed base 4.1 is connected with the annular protecting cover 4.2 through screws 4.4 and/or pins 4.5; sealing elements 14 are arranged on the contact surfaces of the cover plate 8 and the fixed base 4.1, and the contact surfaces of the fixed base 4.1 and the annular protecting cover 4.2; the cover plate 8 is provided with a handle 12.

The technical scheme greatly avoids the influence of centrifugal force on the annular protecting cover 4.2 and the force measuring sensing device 3 when the main shaft 1 rotates, and also greatly reduces the influence on the main shaft 1 when the annular protecting cover 4.2 is pulled by the centrifugal force generated by the fixed base 4.1 and the force measuring sensing device 3; the relative position relation of the fixed base 4.1 and the annular protecting cover 4.2, the connection mode among the annular protecting cover 4.2, the fixed base 4.1 and the cover plate 8, and the arrangement of the handle 12 on the cover plate 8 ensure stable connection, and simultaneously facilitate installation and disassembly, thereby providing convenience for overhaul and maintenance of the force measuring sensing device 3, and the arrangement of the sealing element 14 provides a stable working environment of dust prevention, water prevention and oil mist prevention for the force measuring sensing device 3; for standardizing the distribution of the communication cables 3.2, a through hole 10 is arranged above a head 2.1 of a coupling bolt body 2, in order to avoid the influence of shaking of the communication cables 3.2 on a sensing probe 3.3, a fixed plug screw 13 corresponding to the radial diameter of the communication cables 3.2 is sleeved on the communication cables 3.2, the communication cables 3.2 axially penetrate through the fixed plug screw 13 to be connected onto the sensing probe 3.3, the radial diameter of the sensing probe 3.3 is larger than that of the communication cables 3.2, the size of the through hole 10 corresponds to that of the fixed plug screw 13, the fixed plug screw 13 is screwed on the through hole 10 after the sensing probe 3.3 is successfully arranged at the head 2.1 of the coupling bolt body 2, and further locking glue is filled in a gap between the plug screw and the communication cables 3.2, so that the disturbance of the signal cables to the probes can be effectively reduced, and the reliability of monitoring results is guaranteed.

Claims

1. Axial force on-line monitoring sensing device suitable for hydroelectric set coupling bolt, including main shaft (1) and coupling bolt body (2) that are used for connecting main shaft (1), its characterized in that: the device also comprises a force measuring sensing device (3), a fixing device (4) and a power supply device (5) for providing a power supply for the force measuring sensing device (3);

the coupling bolt body (2) comprises a head part (2.1) and a connecting part (2.2), and an annular flange bulge (6) for the connecting part (2.2) of the coupling bolt body (2) to penetrate is arranged on the main shaft (1); the annular flange bulge (6) is arranged concentrically with the main shaft (1) and is integrated with the main shaft (1); the plurality of coupling bolt bodies (2) are arranged on the annular flange bulge (6) at equal intervals around the main shaft (1);

the fixing device (4) comprises a fixing base (4.1) and an annular protecting cover (4.2) which is concentric with the main shaft (1); the annular protecting cover (4.2), the main shaft (1) and the annular flange bulge (6) are matched with each other to form an annular inner cavity (7) concentric with the main shaft (1); the head (2.1) of the coupling bolt body (2) is positioned in the annular inner cavity (7); one end of the fixed base (4.1) is arranged on the annular protecting cover (4.2), and the other end of the fixed base (4.1) is provided with a cover plate (8) corresponding to the fixed base (4.1); the cover plate (8), the annular protecting cover (4.2) and the fixed base (4.1) are matched with each other to form a closed cavity (9), and the power supply device (5) is arranged in the closed cavity (9);

the force measuring sensing device (3) comprises a communication cable (3.2), a signal processing unit (3.1) for collecting, converting, temporarily storing and uploading signals, and a plurality of sensing probes (3.3) arranged at the head (2.1) of the coupling bolt body (2), wherein one sensing probe (3.3) is correspondingly arranged on one coupling bolt body (2); the signal processing unit (3.1) is arranged in the closed cavity (9), a threading hole (11) is formed in the closed cavity (9), one end of the communication cable (3.2) is connected with the sensing probe (3.3), and the other end of the communication cable (3.2) penetrates through the threading hole (11) to be connected into the signal processing unit (3.1).

2. The axial force on-line monitoring and sensing device suitable for the shaft coupling bolt of the water turbine generator set according to claim 1 is characterized in that: the signal processing unit (3.1) comprises a network cable, and an industrial personal computer, an ultrasonic host and a deconcentrator which are sequentially connected through the network cable; the sensing probe (3.3) is connected with the deconcentrator through a communication cable (3.2).

3. The on-line axial force monitoring and sensing device suitable for the shaft coupling bolt of the hydroelectric generating set according to claim 1 or 2, which is characterized in that: the annular protecting cover (4.2) is provided with two identical sealed cavities (9), and the two sealed cavities (9) are respectively positioned at two ends of one radial diameter of the main shaft (1); the signal processing unit (3.1) is divided into two parts which are respectively arranged in the two closed cavities (9).

4. The axial force on-line monitoring and sensing device suitable for the shaft coupling bolt of the water turbine generator set according to claim 1 is characterized in that: the fixed base (4.1) is arranged at one end, close to the main shaft (1), of the annular protecting cover (4.2) and is located outside the annular inner cavity (7).

5. The axial force on-line monitoring and sensing device suitable for the shaft coupling bolt of the water turbine generator set according to claim 4 is characterized in that: be provided with a plurality of confession on annular protecting cover (4.2) perforation (10) that communication cable (3.2) passed, perforation (10) are in the top of shaft coupling bolt body (2) head (2.1), one sensing probe (3.3) correspond one and perforate (10).

6. The axial force on-line monitoring and sensing device suitable for the shaft coupling bolt of the water turbine generator set according to claim 5 is characterized in that: the communication cable (3.2) is close to one pot head of sensing probe (3.3) and is equipped with and is used for preventing that communication cable (3.2) from rocking fixed plug screw (13), and communication cable (3.2) pass and connect sensing probe (3.3) behind perforation (10), and fixed plug screw (13) is rotatory to be inserted in perforation (10).

7. The axial force on-line monitoring and sensing device suitable for the shaft coupling bolt of the water turbine generator set according to claim 1 is characterized in that: the cover plate (8) and the fixed base (4.1) and the annular protecting cover (4.2) are connected through screws (4.4) and/or pins (4.5); the cover plate (8) is in contact with the contact surface of the fixed base (4.1), the fixed base (4.1) and the annular protecting cover (4.2) are provided with sealing pieces (14).

8. The axial force on-line monitoring and sensing device suitable for the shaft coupling bolt of the water turbine generator set according to claim 1 is characterized in that: the axial cross section of the annular protecting cover (4.2) is of an inverted L-shaped structure.

9. The axial force on-line monitoring and sensing device suitable for the shaft coupling bolt of the water turbine generator set according to claim 1 is characterized in that: the fixing device (4) further comprises a cable clamp (4.3), and a screw (4.4) is arranged on the cable clamp (4.3); the cable clamp (4.3) is matched with the screw (4.4) for fixing the communication cable (3.2) on the annular protecting cover (4.2).

10. The axial force on-line monitoring and sensing device suitable for the shaft coupling bolt of the water turbine generator set according to claim 1 is characterized in that: the cover plate (8) is provided with a handle (12).