CN115488808A

CN115488808A - Underwater screwing device for nuclear power station

Info

Publication number: CN115488808A
Application number: CN202211058250.1A
Authority: CN
Inventors: 张红; 刘治; 吴梦莹; 陈嘉杰; 吴玉; 赵阿朋; 陈国栋; 梁军; 孙飞翔
Original assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Technology Research Institute Co Ltd; CGN Power Co Ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2022-12-20

Abstract

The invention discloses an underwater screwing device for a nuclear power station, which comprises a supporting frame and a watertight motor mechanism; the watertight motor mechanism comprises a watertight shell, a Hall-free direct current brushless motor, a rotary wrench, a torque sensor for detecting the torque and a rotary transformer for monitoring a rotor rotation signal of the Hall-free direct current brushless motor; the watertight housing is connected with braced frame in order by spacing in braced frame, and no hall DC brushless motor, torque sensor and resolver all accept in the watertight housing, and no hall DC brushless motor is connected and drive rotatory spanner rotary motion with the one end of rotatory spanner, and the relative other end of rotatory spanner drives to wait to twist a coaxial rotation of piece. The invention can carry out screwing operation underwater; the rotary transformer replaces a Hall sensor and is matched with a Hall-free direct current brushless motor for use, so that the adverse effect of nuclear radiation on the motor is effectively avoided; the torque sensor can monitor and feed back the output torque so as to realize accurate control of the output torque.

Description

Underwater screwing device for nuclear power station

Technical Field

The invention relates to a screwing device, in particular to an underwater screwing device for a nuclear power station.

Background

The tightening shaft device is mainly applied to the screwing task of components such as bolts and has been widely applied on land. However, in the underwater field, the motors, sensors and the like in the underwater field need to be sealed, the technical difficulty is high, and the underwater sealing device is not a mature product at present.

The existing underwater servo motor can only realize angle and speed control generally, but cannot perform torque control, and cannot meet the requirements of underwater maintenance operation. In particular, in the application field of nuclear power plants, special processing is required in the aspects of motor type selection, sensor signal transmission and the like in consideration of the radiation resistance of the motor and sensor signals.

Disclosure of Invention

The invention aims to solve the technical problem of providing an underwater screwing device for a nuclear power station, aiming at the defects of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the underwater screwing device for the nuclear power station comprises a supporting frame and a watertight motor mechanism;

the watertight motor mechanism comprises a watertight shell, a Hall-free direct current brushless motor, a rotary wrench, a torque sensor and a rotary transformer, wherein the torque sensor is used for detecting the torque, and the rotary transformer is used for monitoring a rotor rotation signal of the Hall-free direct current brushless motor;

the watertight housing with braced frame connects in order to be spacing in braced frame, no hall DC brushless motor, torque sensor and resolver all accept in the watertight housing, rotatory spanner is connected the front end portion of watertight housing, no hall DC brushless motor with rotatory spanner's one end is connected and is driven rotatory spanner rotary motion, rotatory spanner's the relative other end with wait to twist a coaxial cooperation of piece, in order to drive wait to twist a coaxial rotation of piece.

Preferably, the support frame comprises support plates arranged oppositely in parallel, and guide rails connected between the support plates, and the watertight housing is located between the support plates and is slidably connected with the guide rails.

Preferably, the guide rail comprises a plurality of guide rods;

the support frame further comprises a guide ring sleeved on the outer peripheral surface of the watertight shell, a connecting hole for the guide rail to penetrate is formed in the guide ring, and the watertight shell is connected with the guide rod in a sliding mode through the guide ring.

Preferably, the support frame further includes an elastic member provided on the guide rail, and a rear end portion of the watertight case abuts against the elastic member.

Preferably, the watertight housing comprises a cylindrical housing, a front end cover hermetically connected to the front end of the housing, and a rear end cover hermetically connected to the rear end of the housing.

Preferably, the watertight motor mechanism further comprises a sealing rotating shaft arranged between the hall-free brushless direct current motor and the rotary wrench, and the sealing rotating shaft is in dynamic sealing connection with the watertight housing.

Preferably, the watertight motor mechanism is still including setting up rotatory spanner with fixed cover between the sealed pivot, the one end of fixed cover with sealed pivot tight fit is connected, rotatory spanner with the connection can be dismantled to the relative other end of fixed cover.

Preferably, the watertight motor mechanism further comprises an expansion sleeve connected between the fixed sleeve and the rotary wrench.

Preferably, a bearing is arranged between the sealing rotating shaft and the watertight housing.

Preferably, a watertight connector is arranged on the watertight shell, one end of the watertight connector, which is positioned in the watertight shell, is connected with an electric signal line of the watertight motor mechanism, and one end of the watertight connector, which is positioned outside the watertight shell, is connected with a ground control system.

The invention has at least the following beneficial effects: the Hall-free direct current brushless motor, the torque sensor and the rotary transformer are all accommodated in the watertight shell, and the screwing wrench can be driven to carry out screwing operation underwater; the characteristic that a semiconductor element is seriously influenced by nuclear radiation is considered, a rotary transformer is adopted to replace a Hall sensor and is matched with a Hall-free direct current brushless motor for use, and the adverse influence of the nuclear radiation of a nuclear power station on the motor is effectively avoided; the torque sensor can monitor and feed back the output torque so as to realize accurate control of the output torque.

Drawings

The invention will be further described with reference to the following drawings and examples, in which:

FIG. 1 is a schematic structural view of a nuclear power plant underwater screwing device according to an embodiment of the present invention from a perspective;

FIG. 2 is a schematic structural diagram of a nuclear power plant underwater screwing device in another view according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a nuclear power plant underwater screwing device according to an embodiment of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Fig. 1 to 3 show a nuclear power plant underwater screwing device of an embodiment of the present invention, which includes a support frame 3, a watertight motor mechanism; the watertight motor mechanism comprises a watertight shell 1, a Hall-free brushless DC motor 20, a rotary wrench 13, a torque sensor 22 for detecting the torque, and a rotary transformer 29 for monitoring the rotor rotation signal of the Hall-free brushless DC motor 20.

The watertight case 1 is connected with the support frame 3 to be confined within the support frame 3. The brushless dc hall-less motor unit, the torque sensor 22, and the resolver 29 are housed in the watertight case 1, and the rotary wrench 13 is connected to the front end of the watertight case 1.

The hall-free dc brushless motor 20 is connected to one end of the rotary wrench 13 and drives the rotary wrench 13 to rotate, and the other end of the rotary wrench 13 is coaxially engaged with a member to be screwed (not shown) to drive the member to be screwed to rotate coaxially.

Specifically, the rotary transformer 29 is selected to feed back a rotation signal of the rotor of the hall-less dc brushless motor 20 to a control system (not shown) corresponding to the setting of the hall-less dc brushless motor 20, so as to implement synchronous following of the hall-less dc brushless motor 20. The torque sensor 22 is capable of accurately controlling the torque output from the brushless motor 20 in cooperation with a control system.

The preferred resolver 29 is the type polymagawa TS2620N21E11; the preferred torque sensor 22 is a jino JNNT-F-1000 dual-flange static torque sensor.

In addition, the screwing device is considered to be in an environment irradiated by nuclear power stations for a long time, large equipment of the nuclear power stations needs to be in close contact with the screwing device to complete screwing operation of corresponding parts, and the driving motor of the watertight motor mechanism has strict radiation protection requirements.

The semiconductor device in the common Hall motor receives nuclear radiation in a short distance for a long time, so that the semiconductor device is damaged to different degrees and the whole normal work of the device is influenced. Optimization of radiation shielding and the like of the semiconductor device has the obstacles of high cost, high difficulty and the like.

Factors such as radiation protection, research and development cost, motor performance and the like are comprehensively considered, and the Hall-free direct current brushless motor 20 is selected as the driving motor in the watertight motor mechanism.

The hall-free direct current brushless motor 20 can effectively avoid adverse effects of nuclear radiation of the nuclear power station, has the characteristics of good starting characteristic, good stability and large torque, and can be well suitable for screwing large-scale equipment of the nuclear power station. The hall-less dc brushless motor 20 is preferably a model YFL129-7119 frameless torque motor, model number, research, su.

Further, the support frame 3 includes support plates 30 disposed in parallel and opposite to each other, and guide rails 31 connected between the support plates 30, and the watertight case 1 is located between the support plates 30 and slidably connected with the guide rails 31. The screw wrench 13 extends through a through hole (not shown) formed in the support plate 30.

The support frame 3 further comprises a bottom plate 33 connected to the bottom of the two support plates 30. When the screwing device of the present embodiment is used for underwater screwing operation, the watertight case 1 is supported by the bottom plate 33 and is placed on a working platform (not shown), and the screwing operation is performed by submerging the working platform into a position corresponding to an object to be screwed under water.

In consideration of the underwater corrosion prevention requirement, each component of the support frame 3 can be processed by adopting a hard anodized aluminum alloy plate.

Further, the guide rail 31 includes a plurality of guide rods; the supporting frame further comprises a guide ring 34 sleeved on the outer peripheral surface of the watertight housing, a connecting hole (not shown) for the guide rail 31 to penetrate through is formed in the guide ring 34, and the watertight housing 1 is connected with the guide rod in a sliding mode through the guide ring 34.

Specifically, the guide rings in this embodiment include a front guide ring 8 and a rear guide ring 9, the front guide ring 8 is sleeved on the outer peripheral surface of the watertight case 1 near the front end thereof, and the rear guide ring 9 is sleeved on the outer peripheral surface of the watertight case 1 near the rear end thereof. The watertight housing 1 is limited between the two support plates 30 by the matching connection of the guide ring 34 and the guide rod.

It should be understood that in other embodiments, the number and arrangement of the guiding rods and the guiding rings 34 can be adjusted accordingly by comprehensively considering the specific factors of the size, the stress stability, and the like of the watertight housing 1 and the supporting plate 30, and should not be considered as limiting the technical solution of the present invention.

In another embodiment, the guide rail comprises a sliding groove, and a sliding block slidably disposed in the sliding groove, and the watertight housing 1 is slidably connected with the sliding groove through the sliding block.

Further, the support frame further includes an elastic member 32 provided on the guide rail, and the rear end portion of the watertight case abuts against the elastic member 32.

Specifically, the guide rail 31 is connected between the support plates 30 by bolts 2. The elastic member 32 is a multilayered wave spring in this embodiment. The elastic member 32 can provide an elastic force to ensure that the rotary wrench 13 is always in contact with the member to be screwed during screwing.

The watertight case 1 is held between the two support plates 30 by the guide rail 31, and the rear end portion thereof abuts against the elastic member 32, so that when the rotation wrench 13 performs the screwing operation, the watertight case 1 is moved rearward by the recoil force toward the rear end portion thereof to compress the elastic member 32, thereby being supported.

Referring to fig. 1-3, in the present embodiment, two sets of identical watertight motor mechanisms are integrated on the same support frame 3, and can be used for performing biaxial screwing operation on paired positions of to-be-screwed members, for example, in actual operation, screwing operation on corresponding paired bolts on a radiation-proof sample monitoring device of a nuclear power plant is performed.

It will be appreciated that in other embodiments, more than two watertight motor mechanisms may be integrated on the same support frame 3; alternatively, only one set of watertight motor mechanism may be provided on one support frame 3, and different screwing operations may be adapted according to the application scenario.

Further, the watertight case 1 includes a cylindrical case 11, a front end cover 10 sealingly coupled to a front end of the case 11, and a rear end cover 12 sealingly coupled to a rear end of the case 11.

Specifically, the front cover 10 and the rear cover 12 are respectively locked with the housing 11 by bolt members. When in use, the control component is assembled and then is arranged in the shell 11, and the front end cover 10 and the rear end cover 12 are locked. Meanwhile, the control assembly in the watertight shell 1 can be conveniently overhauled, replaced and the like.

It will be appreciated that in other embodiments the watertight housing 1 may also be integrally formed, with the control assembly accordingly being integrally integrated within the watertight housing 1.

Referring to fig. 3, the watertight motor mechanism further includes a motor housing 19, a motor rear end cover 21, and an RV reducer 18.

Along the direction of keeping away from the one side of rotary wrench 13, RV speed reducer 18, no hall direct current brushless motor 20, resolver 29 connect the distribution in proper order in motor casing 19. The side of the motor housing 19 remote from the wrench 13 is connected to a motor rear end cap 21. One end of the torque sensor 22 is fastened with the motor rear end cover 21 through a screw 23, and the other end is fastened with the rear end cover 12 through a watertight screw 24.

The rotor of the hall-less dc brushless motor 20 is connected to a motor shaft 25, a coaxial rotating shaft 26 is provided inside the motor shaft 25, the rotating shaft 26 is fastened to the motor shaft 25 by a screw (not shown), and one end of the rotating shaft 26 is connected to an input shaft (not shown) of the RV reducer 18 by a screw (not shown).

Referring to fig. 3, the watertight motor mechanism further includes a sealing shaft 16 disposed between the hall-less dc brushless motor 20 and the rotation wrench 13, and the sealing shaft 16 is connected to the watertight housing 1 in a dynamic sealing manner.

The dynamic sealing connection between the sealing rotation shaft 16 and the watertight housing 1 can be realized by arranging two layers of O-shaped sealing rings 28 between the sealing rotation shaft 16 and the front end cover 10.

Further, the watertight motor mechanism further comprises a fixing sleeve 14 arranged between the rotary wrench 13 and the sealing rotating shaft 16, one end of the fixing sleeve 14 is connected with the sealing rotating shaft 16 in a tight fit mode, and the rotary wrench 13 is detachably connected with the other end, opposite to the fixing sleeve 14, of the fixing sleeve 14.

For the realization can dismantle the connection, can set up the tight cover 15 that expands between fixed cover 14 and rotatory spanner 13, the tight cover 15 that expands passes through bolt locking on fixed cover 14 inner wall, and rotatory spanner 13 is connected to inner ring department, can install the rotatory spanner 13 of different grade type on the tight cover 15 that expands of different internal diameters, therefore the accessible is changed the tight cover 15 that expands of different internal diameters and is realized the change of multiple rotatory spanner 13 to the piece is twisted to the adaptation difference of treating.

Through practical use tests, the preferred outer diameter of the expansion sleeve 15 is 47mm, and the inner diameter can be 19mm, 20mm, 21mm, 22mm, 23mm, 24mm and other specifications.

Further, a bearing 17 is provided between the seal rotation shaft 16 and the watertight case 1. Specifically, the bearing 17 is tightly fitted between the front end cover 10 and the seal rotating shaft 16 to support the rotation of the seal rotating shaft 16, so that the coaxiality of the seal rotating shaft 16 and the front end cover 10 and the rotation precision of the seal rotating shaft 16 can be ensured, and the load torque of the rotary wrench 13 can be accurately transmitted to the torque sensor 22.

Preferably, the bearing 17 is a cross roller bearing, and the model is THK RB10016.

Furthermore, a watertight connector 27 is arranged on the watertight housing 1, one end of the watertight connector 27 located inside the watertight housing 1 is connected with an electrical signal line of the watertight motor mechanism, and one end of the watertight connector 27 located outside the watertight housing 1 is connected with a ground control system.

Referring to fig. 1-3, in this embodiment, two watertight connectors 27 are provided at the top of each watertight housing, and in other embodiments, different numbers of watertight connectors 27 may be provided depending on the actual situation.

The above description is only for the purpose of illustrating certain embodiments of the present invention and is not intended to limit the scope of the present invention, which is within the scope of the present invention, and all equivalent structures or equivalent processes that can be directly or indirectly implemented in other related arts and technologies using the contents of the present specification and the accompanying drawings are also included in the present invention.

Claims

1. An underwater screwing device for a nuclear power station is characterized by comprising a supporting frame and a watertight motor mechanism;

the watertight motor mechanism comprises a watertight shell, a Hall-free brushless direct current motor, a rotary wrench, a torque sensor for detecting the torque and a rotary transformer for monitoring a rotor rotation signal of the Hall-free brushless direct current motor;

the watertight housing with braced frame connects in order to be spacing in braced frame, no hall DC brushless motor, torque sensor and resolver all accept in the watertight housing, rotatory spanner is connected the front end portion of watertight housing, no hall DC brushless motor with the one end of rotatory spanner is connected and is driven rotatory spanner rotary motion, the relative other end of rotatory spanner with wait to twist and twist a coaxial cooperation, in order to drive wait to twist and twist a coaxial rotation.

2. The nuclear power plant underwater screwing device of claim 1, wherein said support frame comprises parallel opposite support plates, guide rails connected between said support plates, and said watertight housing is located between said support plates and slidably connected with said guide rails.

3. The nuclear power plant underwater screwing device according to claim 2, wherein the guide rail comprises a plurality of guide rods;

the supporting frame further comprises a guide ring sleeved on the outer peripheral surface of the watertight shell, a connecting hole for the guide rail to penetrate is formed in the guide ring, and the watertight shell is connected with the guide rod in a sliding mode through the guide ring.

4. The nuclear power plant underwater screwing device according to claim 2, wherein the support frame further comprises an elastic member provided on the guide rail, a rear end portion of the watertight case abutting against the elastic member.

5. The nuclear power plant underwater screwing device according to any one of claims 1 to 4, wherein said watertight case includes a cylindrical case, a front end cap sealingly attached to a front end of said case, and a rear end cap sealingly attached to a rear end of said case.

6. The nuclear power station underwater screwing device according to any one of claims 1 to 4, wherein the watertight motor mechanism further comprises a sealing rotating shaft arranged between the Hall-free brushless DC motor and the rotating wrench, and the sealing rotating shaft is in dynamic sealing connection with the watertight housing.

7. The nuclear power plant underwater screwing device according to claim 6, wherein the watertight motor mechanism further comprises a fixing sleeve disposed between the rotary wrench and the sealing rotating shaft, one end of the fixing sleeve is tightly fitted and connected with the sealing rotating shaft, and the rotary wrench is detachably connected with the opposite end of the fixing sleeve.

8. The nuclear power plant underwater screwing device according to claim 7, wherein said watertight motor mechanism further comprises an expansion sleeve connected between said fixing sleeve and said rotary wrench.

9. The nuclear power plant underwater screwing device of claim 6, wherein a bearing is provided between the sealing rotating shaft and the watertight case.

10. The nuclear power station underwater screwing device according to any one of claims 1 to 4, wherein a watertight connector is arranged on the watertight housing, one end of the watertight connector, which is positioned inside the watertight housing, is connected with an electric signal line of the watertight motor mechanism, and one end of the watertight connector, which is positioned outside the watertight housing, is connected with a ground control system.