CN217239053U - Gripping apparatus for gripping nuclear fuel assembly for nuclear power station - Google Patents

Abstract

The utility model belongs to the technical field of nuclear fuel assembly for the nuclear power station, concretely relates to gripping apparatus for snatching nuclear fuel assembly for the nuclear power station, include: the outer sleeve and the inner cylinder body are arranged in the outer sleeve; the lower part of the outer sleeve is provided with a circle of steps protruding inwards, and the steps are provided with two symmetrical openings, so that two lifting lugs of a nuclear fuel assembly enter the outer sleeve from the openings and fall on the steps; the diameter between the steps is smaller than that of the nuclear fuel assembly lifting lug; the inner cylinder body can slide up and down in the outer sleeve, the diameter of the inner cylinder body is smaller than that of the nuclear fuel assembly lifting lug, and the inner cylinder body is used for fixing the nuclear fuel assembly lifting lug at the step by utilizing the gravity of the inner cylinder body. The gripping apparatus has no sharp corners, and avoids damaging the surface of the nuclear fuel assembly or influencing the smooth loading and unloading of the nuclear fuel assembly.

Description

Gripping apparatus for gripping nuclear fuel assembly for nuclear power station

Technical Field

The application belongs to the technical field of nuclear fuel assemblies for nuclear power stations, and particularly relates to a gripping apparatus for gripping a nuclear fuel assembly for a nuclear power station.

Background

Nuclear fuel assemblies within nuclear reactors are the source of power for nuclear power plants. Each overhaul of the nuclear power plant requires a refueling operation, a portion of the irradiated nuclear fuel assemblies, which have reached a certain burn-up depth, are removed from the reactor and new nuclear fuel assemblies are installed. Irradiated nuclear fuel assemblies are highly radioactive and require special equipment and tools to operate underwater to meet the corresponding radiation shielding requirements.

The safe operation of the nuclear fuel assembly is very important, and a gripping apparatus specially designed for loading and unloading the nuclear fuel is required according to the requirements of 'design of fuel loading, unloading and storage systems of HAD102-15-2007 nuclear power plants', so that the safe and reliable operation of the nuclear fuel assembly is ensured. The operation environment of the gripping apparatus for operating the nuclear fuel assembly is underwater, and if the gripping apparatus is abnormal, the overhaul work of the nuclear power station cannot be normally carried out, and even nuclear accidents can be caused. Therefore, the reliability of the nuclear fuel assembly gripper is of particular importance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gripping apparatus for snatching nuclear fuel subassembly for nuclear power station solves the operational environment of nuclear fuel subassembly operation gripping apparatus and is under water, if the abnormal conditions of gripping apparatus appears, will lead to the unable normal development of nuclear power station overhaul work, can cause the problem of nuclear accident even.

The technical scheme for realizing the purpose of the application is as follows:

the embodiment of the application provides a gripping apparatus for grabbing nuclear fuel assembly for nuclear power station, the gripping apparatus includes: the device comprises an outer sleeve and an inner cylinder arranged in the outer sleeve;

the lower part of the outer sleeve is provided with a circle of steps protruding inwards, and the steps are provided with two symmetrical openings, so that two lifting lugs of a nuclear fuel assembly enter the outer sleeve from the openings and fall on the steps; the diameter between the steps is smaller than that of the nuclear fuel assembly lifting lug;

the inner cylinder body can slide up and down in the outer sleeve, the diameter of the inner cylinder body is smaller than that of the nuclear fuel assembly lifting lug, and the inner cylinder body is used for fixing the nuclear fuel assembly lifting lug at the step by utilizing the gravity of the inner cylinder body.

Alternatively to this, the first and second parts may,

a curve groove is formed in the outer sleeve, a positioning pulley is fixed on the inner cylinder body, and the positioning pulley moves up and down in the curve groove;

when the positioning pulley slides downwards along the curve groove, the outer cylinder body is driven to rotate relative to the inner cylinder body, so that the lifting lug of the nuclear fuel assembly enters the outer sleeve from the opening and then falls on the step; when the positioning pulley slides upwards along the curved groove, the outer cylinder body rotates in the opposite direction relative to the inner cylinder body, so that the lifting lug of the nuclear fuel assembly moves from the step to the opening to release the nuclear fuel assembly.

Alternatively to this, the first and second parts may,

the positioning pulley is connected to the inner cylinder through a pin shaft and a bolt gasket.

In the alternative,

the upper end of the inner cylinder body is provided with a connecting mechanism which is used for connecting a material replacing machine through a steel cable of a driving mechanism, so that the inner cylinder body slides upwards by the tension of the steel cable of the driving mechanism.

Alternatively to this, the first and second parts may,

and a sliding cylinder is fixed at the upper part and/or the lower part of the inner cylinder body and is used for contacting with the inner wall of the outer cylinder body to form a friction pair.

Alternatively to this, the first and second parts may,

the sliding cylinder is fixedly connected with the inner cylinder body through threads or a first pin.

Optionally, the lower end of the opening is flared.

Optionally, the outer sleeve and the inner cylinder are symmetrical along a central axis.

Optionally, the outer cylinder includes: the automatic feeding device comprises a bearing sleeve, an inner sleeve, a material replacing machine working rod and a first thrust bearing used for connecting the inner sleeve and the material replacing machine working rod;

the step is arranged at the lower part of the bearing sleeve;

the inner sleeve is fixed in the bearing sleeve through a second pin;

the refueling machine working rod is of a hollow structure, and the inner cylinder body is arranged in the refueling machine working rod;

a boss is formed between the upper half section and the lower half section of the operating rod of the refueling machine, and the diameter of the upper half section of the operating rod of the refueling machine is larger than that of the lower half section; the lower half section of the refueling machine working rod is inserted into the inner sleeve, and the upper half section of the refueling machine working rod protrudes from the upper ends of the bearing sleeve and the inner sleeve; the boss is located on one thrust washer of the first thrust bearing, and the other thrust washer of the first thrust bearing is located on the upper end face of the inner sleeve;

the curve groove penetrates through the bearing sleeve, the inner barrel and the working rod of the material replacing machine.

Alternatively to this, the first and second parts may,

the upper half section of the operating rod of the material replacing machine is provided with a guide key for connecting the material replacing machine.

Optionally, a first indicating component is arranged on the outer wall of the bearing sleeve, and a second indicating component and a third indicating component are arranged on the outer wall of the upper half section of the work rod of the refueling machine;

when the positioning pulley slides upwards to the top end of the curved groove, the first indicating component and the second indicating component are aligned; when the positioning pulley slides down to the bottom end of the curved groove, the first indicating member and the third indicating member are aligned.

Optionally, the outer cylinder further includes: a guide cylinder and a second thrust bearing for connecting the guide cylinder and the inner sleeve;

the outer wall of the guide cylinder is provided with a fixing part extending upwards and used for being fixed at the lower end of the operating rod of the material replacing machine through a third pin;

the lower end face of the inner sleeve is located on one thrust washer of the second thrust bearing, and the other thrust washer of the second thrust bearing is located on the upper end face of the fixed component;

the lower part of the guide cylinder is of an opening structure, the upper part of the guide cylinder is provided with a sealing plate, and the lower end of the inner cylinder body falls on the sealing plate; the diameter of the opening structure is larger than that of the fuel assembly;

the side wall of the guide cylinder is provided with two guide grooves which correspond to the openings one by one and are used for inserting two lifting lugs of the fuel assembly; when the positioning pulley slides upwards to the top end of the curve groove, the guide groove is aligned with the corresponding opening.

Alternatively to this, the first and second parts may,

the step is provided with two grooves which correspond to the guide grooves one to one and are used for accommodating two lifting lugs of the fuel assembly; when the positioning pulley slides downwards to the bottom end of the curve groove, the guide groove is aligned with the corresponding groove.

Alternatively to this, the first and second parts may,

the diameter of the upper half section of the inner cylinder body is larger than that of the lower half section of the inner cylinder body and that of the lower half section of the working rod of the material replacing machine;

the lower half section of the inner cylinder body is inserted into the lower half section of the working rod of the refueling machine, and the upper half section of the inner cylinder body is arranged in the upper half section of the working rod of the refueling machine.

The beneficial technical effect of this application lies in:

(1) the embodiment of the application provides a gripping apparatus for gripping a nuclear fuel assembly for a nuclear power station, which has no sharp corner, and avoids damaging the surface of the nuclear fuel assembly or influencing the smooth loading and unloading of the nuclear fuel assembly; the locking device has a self-locking function, and when the device runs in a load or is powered off, the gripping device and the nuclear fuel assembly cannot be separated, so that the locking effect in the transportation process can be further improved; the switch operation of the gripping apparatus has definite position indication, the control precision of connecting and disconnecting the nuclear fuel assembly is higher, and the reliability is better.

(2) The embodiment of the application provides a gripping apparatus for grabbing nuclear fuel assembly for nuclear power station, and all spare parts all design to detachable construction, and it is convenient to overhaul, has reduced the time that failure cause analysis and dismouting were overhauld, has reduced equipment maintenance cost and staff's nuclear radiation dose.

(3) The embodiment of the application provides a gripping apparatus for grabbing nuclear fuel assembly for nuclear power station, the linear motion through interior barrel only can accomplish the switching action, set up two positioning pulleys on the barrel including, resistance when barrel up-and-down motion in the reduction sets up two axial thrust bearings simultaneously on outer barrel, reduces outer barrel rotary motion's resistance, can make the gripping apparatus realize faster connection and throw off nuclear fuel assembly, easily pack into and unload out nuclear fuel assembly.

(4) The embodiment of the application provides a gripping apparatus for grabbing a nuclear fuel assembly for a nuclear power station, and the switching action does not need to be additionally realized by means of an air source or other power sources of a power lamp through the self weight of an inner cylinder body or overcoming the self weight of the inner cylinder body, so that the risk that the gripping apparatus is unavailable due to the failure of an additional power source is fundamentally eliminated, the problem that the additional power source is difficult to control is solved, and the reliability of the gripping apparatus for the nuclear fuel assembly is improved.

(5) The embodiment of the application provides a gripping apparatus for grabbing nuclear fuel assembly for a nuclear power station, and the main outer cylinder and the inner cylinder are symmetrical along a central axis, so that the stress of the main outer cylinder and the inner cylinder is more uniform. Practice proves that the nuclear fuel assembly has stable working performance in a particularly turbid medium, and the phenomenon of jam and no action caused by the influence of impurities in the spent pool water is avoided, so that the operation safety of the nuclear fuel assembly is improved.

Drawings

Fig. 1 is a schematic structural diagram of a gripper for gripping a nuclear fuel assembly for a nuclear power plant according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of another gripper for gripping a nuclear fuel assembly for a nuclear power plant according to an embodiment of the present disclosure;

fig. 3a and 3b are side and top views of a nuclear fuel assembly.

In the figure:

1-an outer sleeve; 11-step, 111-groove; 12-an opening; 13-curved slot; 14-a bearing sleeve for the bearing of the bearing,

141-a first indicating member; 15-an inner sleeve; 16-refueling machine work bar, 161-boss, 162-guide key, 163-second indicator part; 164-a third indicator member; 171-a first thrust bearing, 172-a second thrust bearing; 18-a second pin; 19-guide cylinder, 191-fixing component, 192-third pin, 193-opening structure, 194-closing plate, 195-guide groove;

2-inner cylinder; 21-positioning the pulley; 22-a connection mechanism; 23-a sliding cylinder; 24-a first pin;

3-a nuclear fuel assembly; 31-lifting lug.

Detailed Description

In order to make the technical solutions in the embodiments of the present application more comprehensible to those skilled in the art, the following description will be made in detail and completely with reference to the accompanying drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only some of the embodiments of the present application, and not all of them. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present application.

The inventor of the application finds in research that some nuclear fuel assembly grippers are complex in structure, multiple in parts and sensitive to impurities in a water tank at present; disassembly, inspection and maintenance are needed, and the nuclear radiation dose of workers is increased; the failure rate is high, and the maintenance is difficult; the connection and disconnection actions need to be realized by means of external power, are difficult to control and are not firm to grasp; the safety devices preventing the tripping of the nuclear fuel assemblies may fail, with the risk of the nuclear fuel assemblies accidentally falling during the movement.

Therefore, the embodiment of the application provides the operating gripper for the nuclear fuel assembly for the nuclear power station, firstly, the opening and closing action can be completed only through the linear motion of the inner cylinder, the two positioning pulleys are arranged on the inner cylinder, the resistance of the inner cylinder in the up-and-down motion process is reduced, meanwhile, the two axial thrust bearings are arranged on the outer cylinder, the resistance of the outer cylinder in the rotating motion is reduced, the gripper can be enabled to realize the rapid connection and disconnection of the nuclear fuel assembly, and the nuclear fuel assembly is easy to load and unload. Secondly, no sharp corner exists, so that the surface of the nuclear fuel assembly is prevented from being damaged or the smooth loading and unloading of the nuclear fuel assembly is prevented from being influenced; the locking device has a self-locking function, and when the device runs with load or is powered off, the gripping apparatus and the nuclear fuel assembly cannot be separated, so that the locking effect in the transportation process can be further improved; the switch operation of the gripping apparatus has definite position indication, and the control precision of connecting and disconnecting the nuclear fuel assembly is higher, and the reliability is better. Thirdly, all spare parts all design detachable construction, and it is convenient to overhaul, has reduced the time that failure cause analysis and dismouting overhauld, has reduced equipment maintenance cost and staff's nuclear radiation dose. Fourthly, the switching action is realized through the dead weight of the inner cylinder body or overcoming the dead weight of the inner cylinder body without additionally using an air source or other power sources of a power lamp, so that the risk that the gripper is unavailable due to the fault of the additional power source is fundamentally eliminated, the problem that the additional power source is difficult to control is solved, and the reliability of the nuclear fuel assembly gripper switch is improved. Fifthly, the main outer cylinder and the inner cylinder are symmetrical along the central axis, so that the stress of the main outer cylinder and the stress of the main inner cylinder are more uniform. Practice proves that the nuclear fuel assembly has stable working performance in a particularly turbid medium, and the phenomenon of jam and no action caused by the influence of impurities in the spent pool water is avoided, so that the operation safety of the nuclear fuel assembly is improved.

Based on the above, in order to clearly and specifically explain the above advantages of the present application, the following description of the embodiments of the present application will be made with reference to the accompanying drawings.

Referring to fig. 1, a schematic structural diagram of a gripper for gripping a nuclear fuel assembly for a nuclear power plant according to an embodiment of the present disclosure is shown.

The embodiment of the application provides a gripping apparatus for grabbing nuclear fuel assembly for nuclear power station includes: the device comprises an outer sleeve 1 and an inner cylinder 2 arranged in the outer sleeve 1;

the lower part of the outer sleeve 1 is provided with a circle of steps 11 protruding inwards, and the steps 11 are provided with two symmetrical openings 12, so that two lifting lugs 31 (shown in figures 3a and 3 b) of the nuclear fuel assembly 3 enter the outer sleeve 1 from the openings 12 and fall on the steps 11; the diameter between the steps 11 is smaller than that at the lifting lug 31 of the nuclear fuel assembly 3;

the inner cylinder 2 can slide up and down in the outer sleeve 1, and the diameter of the inner cylinder 1 is smaller than that of the lifting lug 31 of the nuclear fuel assembly 3, so that the lifting lug 31 of the nuclear fuel assembly 3 is fixed on the step 11 by using the self gravity of the inner cylinder 2.

It will be appreciated that when the lifting lugs 31 of the nuclear fuel assembly 3 are fixed at the steps 11, the nuclear fuel assembly 3 is moved by lifting the outer sleeve 1, and the nuclear fuel assembly 3 is gripped.

In the embodiment of the application, grabbing is realized through the self weight of the inner cylinder body 2 or overcoming the self weight of the inner cylinder body without additionally using an air source or other power sources of a power lamp, so that the risk that the grabbing tool is unavailable due to the fault of the additional power source is fundamentally eliminated, the problem that the additional power source is difficult to control is solved, and the reliability of the switch of the grabbing tool of the nuclear fuel assembly is improved.

In addition, the lifting lug 31 of the nuclear fuel assembly 3 is fixed at the step 11 by the gravity of the inner cylinder 2, the inner cylinder 2 cannot overcome the dead weight of the inner cylinder and the acting force between the nuclear fuel assembly 3 and the outer cylinder 1 to move upwards, the gripper always keeps a self-locking state, the nuclear fuel assembly 3 is prevented from falling off in the lifting and transporting process, namely, the gripper and the nuclear fuel assembly 3 cannot be separated at an abnormal position, the gripper has a self-locking function, when the nuclear fuel assembly is in on-load operation or power failure, the gripper and the nuclear fuel assembly 3 cannot be separated, and the locking effect in the transporting process can be further improved.

It will be appreciated that the rounded outer surface of the outer sleeve 1 is free from sharp corners, avoiding damage to the surface of the nuclear fuel assembly 3 or interference with the smooth loading and unloading of the nuclear fuel assembly 3.

In one example, the lower end of the opening 11 is flared in order to facilitate smooth loading of the nuclear fuel assembly 3.

In another example, the outer sleeve 1 and the inner cylinder 2 are symmetrical along the central axis, so that the force is more uniform. Practice proves that the working performance of the nuclear fuel assembly is stable in a particularly turbid medium, and the phenomenon of jam and non-operation caused by the influence of impurities in spent pool water can be avoided, so that the operation safety of the nuclear fuel assembly 3 is improved.

In order to guide the outer cylinder 1 to rotate so as to facilitate fixing the lifting lug 31 of the nuclear fuel assembly 3 at the step 11, in some possible implementation manners of the embodiment of the application, the outer cylinder 1 is provided with a curved groove 13, the inner cylinder 2 is fixed with a positioning pulley 21, and the positioning pulley 21 moves up and down in the curved groove 13;

when the positioning pulley 21 slides downwards along the curved groove 13, the outer cylinder 1 is driven to rotate relative to the inner cylinder 2, so that the lifting lug 31 of the nuclear fuel assembly 3 enters the outer cylinder 1 from the opening 12 and then falls on the step 11; when the positioning pulley 21 slides upward along the curved groove 13, the outer cylinder 1 rotates in the opposite direction with respect to the inner cylinder 2, so that the lug 31 of the nuclear fuel assembly 3 moves from the step to the opening 11 to release the nuclear fuel assembly 3.

It should be noted that the inner cylinder 2 is guided by the curved groove 13 and the positioning pulley 21 to move up and down in the outer cylinder 1 to drive the outer cylinder 1 to rotate, so that the opening and closing of the gripper, i.e., the operation of connecting and disconnecting the gripper with the nuclear fuel assembly 3, can be completed only by the linear movement of the inner cylinder 1, and the gripper can realize faster connection and disconnection of the nuclear fuel assembly 3, and is easy to load and unload the nuclear fuel assembly 3.

As an example, the positioning pulley 21 is connected to the inner cylinder 2 by a pin 22 and a bolt washer (not shown in the drawings).

To facilitate the unloading of the nuclear fuel assemblies 3, in one example, the upper end of the inner cylinder 2 is provided with a connection mechanism 22 for connecting the refueling machine via a drive mechanism cable so that the inner cylinder 2 slides upward by the tension of the drive mechanism cable.

In another example, in order to reduce resistance when the inner cylinder 2 moves up and down, a sliding cylinder 23 is fixed to the upper and/or lower portion of the inner cylinder 2 for forming a friction pair in contact with the inner wall of the outer cylinder 1.

In practice, the sliding cylinder 23 may be fixedly connected to the inner cylinder 2 by means of a screw thread or a first pin 24.

In some possible implementation manners of the embodiment of the present application, with continuing reference to fig. 1, the outer cylinder 1 may specifically include: a carrying sleeve 14, an inner sleeve 15, a refueling work bar 16 and a first thrust bearing 171 for connecting the inner sleeve 15 and the refueling work bar 16;

the step 11 is arranged at the lower part of the bearing sleeve 14;

the inner sleeve 15 is fixed in the bearing sleeve 14 by a second pin 18;

the work rod 16 of the refueling machine is of a hollow structure, and the inner cylinder body 2 is arranged in the work rod 16 of the refueling machine;

a boss 161 is formed between the upper half section and the lower half section of the refueling machine working rod 16, and the diameter of the upper half section of the refueling machine working rod 16 is larger than that of the lower half section; the lower half section of the refueling machine working rod 16 is inserted into the inner sleeve 15, and the upper half section of the refueling machine working rod 16 protrudes from the upper ends of the bearing sleeve 14 and the inner sleeve 15; the boss 161 is seated on one thrust washer of the first thrust bearing 171, and the other thrust washer of the first thrust bearing is seated on the upper end surface of the inner sleeve 15;

the curved groove 13 runs through the carrying sleeve 14, the inner cylinder 15 and the reclaimer rod 16.

In the embodiment of the present application, the first thrust bearing 171 is provided on the outer cylinder 1 to reduce the resistance to the rotational movement of the outer cylinder 1, so that the gripper can achieve faster attachment and detachment of the nuclear fuel assembly 3, and easy loading and unloading of the nuclear fuel assembly 3. The protrusion of the upper half of the refueling machine working rod 16 from the upper ends of the carrying sleeve 14 and the inner sleeve 15 may facilitate the connection of the refueling machine.

As an example, the upper half of the refueling machine working rod 16 is provided with a guide key 162 for connecting the refueling machine.

In some possible implementations of the embodiment of the present application, as shown in fig. 2, a first indicating member 141 is disposed on an outer wall of the bearing sleeve 14, and a second indicating member 163 and a third indicating member 164 are disposed on an outer wall of the upper half section of the work rod 16 of the refueling machine;

when the positioning pulley 21 slides up to the top end of the curved groove 13, the first and second indicating members 141 and 163 are aligned; when the positioning pulley 21 slides down to the bottom end of the curved groove 13, the first and third indication parts 141 and 164 are aligned.

It will be appreciated that the use of the first 141, second 163 and third 164 indicator members allows a clear indication of the position of the gripper on and off operation, with a higher precision of control and greater reliability of the connection and disconnection of the nuclear fuel assembly 3.

In some possible implementations of the embodiment of the present application, in order to facilitate connection of the nuclear fuel assembly 3, the outer cylinder 1 further includes: a guide cylinder 19 and a second thrust bearing 172 for connecting the guide cylinder 19 and the inner sleeve 15;

the outer wall of the guide cylinder 19 is provided with a fixing member 191 extending upward for fixing to the lower end of the working rod 16 of the reclaimer by a third pin 192;

the lower end face of the inner sleeve 2 is seated on one thrust washer of the second thrust bearing 172, and the other thrust washer of the second thrust bearing 172 is seated on the upper end face of the fixed member 19;

the lower part of the guide cylinder 19 is an opening structure 193, the upper part is provided with a sealing plate 194, and the lower end of the inner cylinder body 2 is dropped on the sealing plate 194; the diameter of the opening structure 193 is larger than that of the nuclear fuel assembly 3;

the side wall of the guide cylinder 19 is provided with two guide grooves 195 corresponding to the openings 12 one by one for inserting the two lifting lugs 31 of the nuclear fuel assembly 3; when the positioning pulley 21 slides up to the top end of the curved groove 13, the guide groove 195 is aligned with the corresponding opening 12.

In the embodiment of the present application, the second thrust bearing 172 is provided on the outer cylinder 1, so that the resistance to the rotational movement of the outer cylinder 1 can be reduced, and the gripper can be connected and disconnected to and from the nuclear fuel assembly 3 more rapidly, thereby facilitating the loading and unloading of the nuclear fuel assembly 3.

It will be appreciated that when the positioning pulley 21 is slid up to the top end of the curved groove 13, the guide groove 195 is aligned with the corresponding opening 12, the two lugs 31 of the nuclear fuel assembly 3 are inserted into the guide groove 195, and as the outer cylinder 1 rotates, the guide groove 195 rotates the two lugs 31 of the nuclear fuel assembly 3 to be seated on the step 11, and the inner cylinder 2 is seated on the closure plate 194, so that the guide cylinder 19 fixes the two lugs 31 of the nuclear fuel assembly 3 on the step 11 to prevent them from falling off.

In one example, in order to improve the fixing effect of the lifting lugs 31, the step 11 is provided with two grooves 111 corresponding to the guide grooves 195 one by one, for accommodating the two lifting lugs 31 of the nuclear fuel assembly 3; when the positioning pulley 21 slides down to the bottom end of the curved groove 13, the guide groove 195 is aligned with the corresponding groove 111 such that the lower end of the shackle 31 is caught in the groove 111.

In another example, to improve the fixing effect on the lifting lugs 31, the diameter of the upper half section of the inner cylinder 2 is larger than the diameter of the lower half section of the inner cylinder 2 and the diameter of the lower half section of the operating rod 16 of the reclaimer; the lower half section of the inner cylinder 2 is inserted into the lower half section of the work rod 16 of the refueling machine, and the upper half section of the inner cylinder 2 is arranged in the upper half section of the work rod 16 of the refueling machine. This also facilitates connection of the refueling machine with the inner barrel 2.

It should be further noted that, according to the gripper for gripping the nuclear fuel assembly for the nuclear power station provided by the embodiment of the application, all parts are designed to be detachable structures, so that the maintenance is convenient, the time for analyzing fault causes and disassembling, assembling and maintaining is reduced, and the equipment maintenance cost and the nuclear radiation dose of workers are reduced.

In actual use, after the opening 11 at the bottom of the outer cylinder 1 is guided and positioned with the lug 31 at the head of the nuclear fuel assembly 3, when the inner cylinder 2 moves downward by its own weight, the positioning pulley 21 rolls downward in the curved groove 13, the outer cylinder 1 rotates counterclockwise, and when the first indicating member 141 on the bearing sleeve 14 reaches the closed position (i.e., aligned with the third indicating member 164), the nuclear fuel assembly gripper is closed and connected with the nuclear fuel assembly 3, and the lug 31 of the nuclear fuel assembly 3 enters the groove 111 of the step 11 at the bottom of the outer cylinder 1; when the inner cylinder 2 moves upward by the pull of the upper wire rope, the positioning pulley 21 rolls upward in the curved groove 13, the outer cylinder 2 rotates clockwise, and when the first indicating member 141 on the carrying sleeve 14 reaches the open position (i.e., aligned with the second indicating member 163), the nuclear fuel assembly gripper opens, disengages from the nuclear fuel assembly 3, and the lifting lug 31 of the nuclear fuel assembly 3 enters the opening 12 of the step 11.

The following describes a specific operation process of a gripper for gripping a nuclear fuel assembly for a nuclear power plant according to an embodiment of the present application in detail with reference to a specific example.

The gripping apparatus for gripping nuclear fuel assemblies for nuclear power stations provided by the embodiment of the application mainly comprises the following steps:

1) the inner cylinder body 2, the outer cylinder body 1, the positioning pulley 21, the first thrust bearing 171 and the second thrust bearing 172 are assembled;

2) mounting the assembled components to the reclaimer work bar 16 and connecting the drive mechanism cable;

3) the method comprises the following steps that (1) the refueling machine is electrified to grab a simulated fuel assembly to test the stability of a grab;

4) when the fuel assembly 3 is grabbed, after the guide cylinder 19 at the bottom of the outer cylinder body 1 and the lifting lug 31 at the head of the nuclear fuel assembly 3 are guided and positioned, the inner cylinder body 2 moves downwards by means of self weight to drive the positioning pulley 21 to roll downwards in the curve groove 13, the outer cylinder body 1 rotates anticlockwise, when the positioning pulley 21 reaches the bottom end of the curve groove 13, the nuclear grabbing tool is connected with the nuclear fuel assembly and closed, and the lifting lug 31 of the nuclear fuel assembly 3 enters the groove 111 of the bottom step 11 of the outer cylinder body 1;

5) when the fuel assembly is released, the inner cylinder body 2 moves upwards by the pulling force of a steel cable of the driving mechanism, the positioning pulley 21 rolls upwards in the curve groove 13, the outer cylinder body 1 rotates clockwise, when the positioning pulley 21 reaches the top end of the curve groove 13, the gripping apparatus is opened to be separated from the nuclear fuel assembly 3, and the lifting lug 31 of the nuclear fuel assembly 3 enters the opening 12 of the step 11;

6) and after the grabbing simulation assembly is checked to be correct, moving the refueling machine to a nuclear fuel assembly storage position to grab the nuclear fuel assembly.

The present application has been described in detail with reference to the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. The prior art can be used for all the matters not described in detail in this application.

Claims (14)

1. A gripper for gripping a nuclear fuel assembly for a nuclear power plant, the gripper comprising: the device comprises an outer sleeve and an inner cylinder arranged in the outer sleeve;

the lower part of the outer sleeve is provided with a circle of steps protruding inwards, and the steps are provided with two symmetrical openings, so that two lifting lugs of a nuclear fuel assembly enter the outer sleeve from the openings and fall on the steps; the diameter between the steps is smaller than that of the nuclear fuel assembly lifting lug;

the inner cylinder body can slide up and down in the outer sleeve, the diameter of the inner cylinder body is smaller than that of the nuclear fuel assembly lifting lug, and the inner cylinder body is used for fixing the nuclear fuel assembly lifting lug at the step by utilizing the gravity of the inner cylinder body.

2. Gripper for gripping a nuclear fuel assembly for a nuclear power plant according to claim 1, characterized in that,

a curve groove is formed in the outer sleeve, a positioning pulley is fixed on the inner cylinder body, and the positioning pulley moves up and down in the curve groove;

when the positioning pulley slides downwards along the curved groove, the outer sleeve is driven to rotate relative to the inner cylinder body, so that the lifting lug of the nuclear fuel assembly falls on the step after entering the outer sleeve from the opening; when the positioning pulley slides upwards along the curved groove, the outer sleeve rotates in the opposite direction relative to the inner cylinder body, so that the lifting lug of the nuclear fuel assembly moves from the step to the opening to release the nuclear fuel assembly.

3. Gripper for gripping nuclear fuel assemblies for nuclear power plants according to claim 2, characterized in that,

the positioning pulley is connected to the inner cylinder through a pin shaft and a bolt gasket.

4. Gripper for gripping a nuclear fuel assembly for a nuclear power plant according to claim 2, characterized in that,

the upper end of the inner cylinder body is provided with a connecting mechanism which is used for connecting a material replacing machine through a steel cable of a driving mechanism, so that the inner cylinder body slides upwards by the tension of the steel cable of the driving mechanism.

5. Gripper for gripping a nuclear fuel assembly for a nuclear power plant according to claim 2, characterized in that,

and a sliding cylinder is fixed at the upper part and/or the lower part of the inner cylinder body and is used for contacting with the inner wall of the outer sleeve to form a friction pair.

6. Gripper for gripping a nuclear fuel assembly for a nuclear power plant according to claim 5, characterized in that,

the sliding cylinder is fixedly connected with the inner cylinder body through threads or a first pin.

7. The gripper of claim 1, wherein a lower end of said opening is flared.

8. The gripper of claim 1, wherein said outer sleeve and said inner cylinder are symmetrical along a central axis.

9. The gripper for gripping nuclear fuel assemblies for nuclear power plants according to any one of claims 2 to 6, characterized in that said outer sleeve comprises: the automatic feeding device comprises a bearing sleeve, an inner sleeve, a material replacing machine working rod and a first thrust bearing used for connecting the inner sleeve and the material replacing machine working rod;

the step is arranged at the lower part of the bearing sleeve;

the inner sleeve is fixed in the bearing sleeve through a second pin;

the work rod of the refueling machine is of a hollow structure, and the inner cylinder body is arranged in the work rod of the refueling machine;

a boss is formed between the upper half section and the lower half section of the operating rod of the refueling machine, and the diameter of the upper half section of the operating rod of the refueling machine is larger than that of the lower half section; the lower half section of the refueling machine working rod is inserted into the inner sleeve, and the upper half section of the refueling machine working rod protrudes from the upper ends of the bearing sleeve and the inner sleeve; the boss is located on one thrust washer of the first thrust bearing, and the other thrust washer of the first thrust bearing is located on the upper end face of the inner sleeve;

the curved groove penetrates through the bearing sleeve, the inner cylinder body and the working rod of the refueling machine.

10. The gripper for gripping a nuclear fuel assembly for a nuclear power plant according to claim 9,

the upper half section of the operating rod of the material replacing machine is provided with a guide key for connecting the material replacing machine.

11. The gripper for gripping a nuclear fuel assembly for a nuclear power plant as recited in claim 9, wherein a first indicating member is provided on an outer wall of the carrying sleeve, and a second indicating member and a third indicating member are provided on an outer wall of an upper half section of the refueling machine operating rod;

when the positioning pulley slides upwards to the top end of the curved groove, the first indicating component and the second indicating component are aligned; when the positioning pulley slides down to the bottom end of the curved groove, the first indicating component and the third indicating component are aligned.

12. The gripper for gripping a nuclear fuel assembly for a nuclear power plant as recited in claim 9, wherein said outer sleeve further comprises: a guide cylinder and a second thrust bearing for connecting the guide cylinder and the inner sleeve;

the outer wall of the guide cylinder is provided with a fixing part which extends upwards and is used for being fixed at the lower end of the working rod of the material replacing machine through a third pin;

the lower end face of the inner sleeve is located on one thrust washer of the second thrust bearing, and the other thrust washer of the second thrust bearing is located on the upper end face of the fixed component;

the lower part of the guide cylinder is of an opening structure, the upper part of the guide cylinder is provided with a sealing plate, and the lower end of the inner cylinder body falls on the sealing plate; the diameter of the opening structure is larger than that of the nuclear fuel assembly;

the side wall of the guide cylinder is provided with two guide grooves which correspond to the openings one by one and are used for inserting two lifting lugs of the nuclear fuel assembly; when the positioning pulley slides upwards to the top end of the curve groove, the guide groove is aligned with the corresponding opening.

13. The gripper for gripping a nuclear fuel assembly for a nuclear power plant according to claim 12,

the step is provided with two grooves which correspond to the guide grooves one to one and are used for accommodating two lifting lugs of the nuclear fuel assembly; when the positioning pulley slides downwards to the bottom end of the curve groove, the guide groove is aligned with the corresponding groove.

14. Gripper for gripping nuclear fuel assemblies for nuclear power plants according to claim 9, characterized in that,

the diameter of the upper half section of the inner cylinder body is larger than that of the lower half section of the inner cylinder body and that of the lower half section of the working rod of the material replacing machine;

the lower half section of the inner cylinder body is inserted into the lower half section of the working rod of the refueling machine, and the upper half section of the inner cylinder body is arranged in the upper half section of the working rod of the refueling machine.

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