阅读说明：本技术 一种反应堆上部组件顶盖压痕测量表夹持装置及夹持方法 (Clamping device and clamping method for top cover indentation measuring meter of upper assembly of reactor ) 是由 曾振华 尤晓波 隋震 曹晔 易良川 刘勇 张建军 张军超 赵翔 万英杰 于 2020-12-31 设计创作，主要内容包括：本发明属于核电站反应堆检修技术领域,具体涉及一种反应堆上部组件顶盖压痕测量表夹持装置及夹持方法,包括：夹持部件、支撑弹簧、调整螺母、活动支撑杆、固定支撑杆、底座；夹持部件与活动支撑杆的顶部焊接连接,活动支撑杆外壁由上至下环套有支撑弹簧和调整螺母；所述活动支撑杆的下部插入固定支撑杆内部,并通过调整螺母将活动支撑杆固定在固定支撑杆上；所述固定支撑杆的底部固定设置在底座上。本发明可节约工作时间,降低人员受照剂量,提高工作效率和测量精度。(The invention belongs to the technical field of nuclear power station reactor maintenance, and particularly relates to a clamping device and a clamping method for a top cover indentation measuring gauge of an upper component of a reactor, wherein the clamping device comprises: the clamping device comprises a clamping component, a supporting spring, an adjusting nut, a movable supporting rod, a fixed supporting rod and a base; the clamping part is welded with the top of the movable support rod, and the outer wall of the movable support rod is sleeved with a support spring and an adjusting nut from top to bottom in an annular manner; the lower part of the movable supporting rod is inserted into the fixed supporting rod, and the movable supporting rod is fixed on the fixed supporting rod through an adjusting nut; the bottom of the fixed supporting rod is fixedly arranged on the base. The invention can save the working time, reduce the irradiated dose of personnel and improve the working efficiency and the measurement precision.)

1. The utility model provides a reactor upper portion subassembly top cap indentation measuring meter clamping device which characterized in that includes: the device comprises a clamping component (8), a supporting spring (9), an adjusting nut (10), a movable supporting rod (11), a fixed supporting rod (12) and a base (13);

the clamping part (8) is welded with the top of the movable support rod (11), and the outer wall of the movable support rod (11) is sleeved with a support spring (9) and an adjusting nut (10) from top to bottom in a sleeved mode; the lower part of the movable supporting rod (11) is inserted into the fixed supporting rod (12), and the movable supporting rod (11) is fixed on the fixed supporting rod (12) through an adjusting nut (10); the bottom of the fixed support rod (12) is fixedly arranged on the base (13).

2. The clamping device for the indentation measuring meter of the reactor upper assembly head as claimed in claim 1, wherein: the clamping member (8) comprises: the device comprises a movable chuck (14), a clamping spring (15), a fixed chuck (16) and a support frame (17);

support frame (17) wholly are "U" type structure, and support frame (17) include: a left support rod (171), a right support rod (172) and a U-shaped opening end; the left support rod (171) is welded with a fixed chuck (16), the right support rod (172) is provided with a mounting through hole, and the movable chuck (14) is arranged on the right support rod (172) by penetrating through the mounting through hole on the right support rod (172); the movable chuck (14) is provided with a clamping spring (15), and the end part of the movable chuck (14) is also provided with a handle which is used for controlling the movable chuck (14) to move left and right on the right support rod (172).

3. The clamping device for the indentation measuring meter of the reactor upper assembly head as claimed in claim 2, wherein: the top of the supporting spring (9) is in contact with the clamping component (8), and the bottom of the supporting spring (9) is in contact with the adjusting nut (10); the adjusting nut (10) is arranged at the top of the fixed support rod (12) in a threaded manner; the adjusting nut (10) is of a hollow cylinder structure.

4. The clamping device for the indentation measuring meter of the reactor upper assembly head as claimed in claim 3, wherein: the whole cylinder structure that is of activity bracing piece (11), activity bracing piece (11) include: an upper support rod part (111) and a lower support rod part (112);

the upper part (111) of the supporting rod penetrates through the adjusting nut (10) and the supporting spring (9), the lower part (112) of the supporting rod is arranged in the fixed supporting rod (12), and the lower part (112) of the supporting rod can move up and down in the fixed supporting rod (12); the diameter of the lower part (112) of the support rod is larger than that of the upper part (111) of the support rod.

5. The clamping device for the indentation measuring meter of the reactor upper assembly head as claimed in claim 4, wherein: the outer wall of the fixed supporting rod (12) is provided with external threads, and the whole fixed supporting rod (12) is of a hollow structure.

6. The apparatus of claim 5, wherein the top assembly indentation measuring gauge holding device comprises: the base (13) comprises: a base plate (18) and a plurality of wheels (19); the whole bottom plate (18) is of a circular plate-shaped structure; the bottom periphery of the bottom plate (18) is uniformly provided with a plurality of wheels (19) along the circumferential direction.

7. A method for holding a holding device for an indentation measuring gauge for a reactor head assembly according to any one of claims 1 to 7, comprising the steps of:

the method comprises the following steps: placing a clamping device on the ground near a top cover of the upper assembly, utilizing a handle at the end part of a movable chuck to pull the movable chuck rightwards, enabling the gap between the movable chuck and a fixed chuck to be larger than the width of a measuring meter, placing the measuring meter between the movable chuck and the fixed chuck, loosening the handle, and utilizing the matching of the fixed chuck and the movable chuck to fix the measuring meter on the clamping device under the action of the spring force of a clamping spring;

step two: a worker manually presses down a clamping component for fixing the measuring meter, compresses a supporting spring to enable the measuring meter to be lower than the top cover sealing surface, moves the whole upper component top cover indentation measuring meter clamping device to be below the top cover sealing surface, and slowly releases the clamping component to enable the measuring meter to be tightly attached to the top cover sealing surface; checking the contact condition of the measuring meter and the sealing surface of the top cover, loosening or screwing the adjusting nut to adjust the compression amount of the spring, and adjusting the measuring meter to a proper position;

step three: after the contact position of the measuring meter and the top cover sealing surface is proper, setting the initial value of the measuring meter to be zero, manually moving the top cover indentation measuring meter clamping device of the upper assembly, aligning a measuring rod of the measuring meter to the top cover indentation position, and measuring the top cover indentation depth; after one point is measured, moving the measuring meter to the next measuring point along the indentation position to continue measuring;

step four: after the 108 measurement points are measured, a worker manually presses the clamping component fixed with the measuring meter downwards, compresses the supporting spring to enable the measuring meter to be lower than the top cover sealing surface, moves the clamping device of the top cover indentation measuring meter of the upper assembly out from the lower part of the top cover sealing surface and releases the clamping component; the movable chuck is opened by using the handle, and the measuring meter is detached from the clamping device.

Technical Field

The invention belongs to the technical field of nuclear power station reactor maintenance, and particularly relates to a clamping device and a clamping method for a top cover indentation measuring gauge of an upper assembly of a reactor.

Background

One project of a certain nuclear power station is two VVER-1000 type units, and a reactor is a B-428 type reactor. The upper assembly, as shown in fig. 1, is an important component of the reactor and is mainly used for sealing a main sealing surface of the reactor to form a compact reactor internal space and prevent the reactor internals from floating upward under the action of core water flow. Meanwhile, the upper assembly plays a role in fixing the control rod driving mechanism and electrical equipment thereof, and fixing the line terminal and the sealing member of the reactor core instrument sensor. The upper assembly top cover 1 is sealed with a reactor pressure vessel 5 through a plurality of main bolts 3, main nuts 2, hemispherical gaskets and 2 nickel gaskets 4. The 2 nickel gaskets are sealing gaskets of the upper assembly top cover 1 and the pressure vessel 5 and are arranged in 2 concentric V-shaped sealing grooves of a flange sealing surface of the pressure vessel, the nickel gasket 4 is compressed by the upper assembly top cover under the action of bolt pre-tightening force, and when the nickel gasket is compressed, the sealing surface of the upper assembly top cover is acted by the nickel gasket 4 to form 2 indentations on the whole circumference, wherein the diameter of the indentation is about 4 meters, and the circumference is about 12.5 meters.

The seal is deciphered to all need to measure upper portion subassembly top cap indentation degree of depth after overhauing the upper portion subassembly at every turn, in order to accurate analysis upper portion subassembly top cap indentation degree of depth change condition, during the overhaul, the upper portion subassembly is deciphered and is sealed the back, and the sealed face of upper portion subassembly is about 800mm apart from ground. In the upper component inspection well, a worker utilizes the measuring meter 6 to measure the indentation of the top cover of the upper component; the existing method for measuring the indentation of the top cover of the upper assembly comprises the following steps: 54 points corresponding to the bolt hole positions are selected along the whole circumference of each indentation, the indentation depth of the corresponding positions is measured by using a measuring table 6, and 108 points are required to be measured for 2 indentations. The current measurement mode is that the staff holds the measuring gauge 6 to measure the top cover indentation, and has the following disadvantages:

(1) due to the fact that the measuring space is narrow, workers need to squat below the top cover of the upper assembly, and lift the measuring meter 6 by hands to conduct top cover indentation measurement, operation is difficult, measuring time is long, and measuring time is about 1.5 hours in all times;

(2) the dosage of the bottom of the top cover of the upper component is large, the contact dosage rate is about 1-2 mSv/h, a worker is always positioned below the top cover of the upper component in the measurement process, and the irradiated dosage of the worker is high;

(3) in the indentation measurement process of the top cover of the upper assembly, a person needs to hold the measuring meter for a long time, the measuring meter is easy to shake and deflect, and the measurement error is increased.

Therefore, a clamping device and a clamping method for an indentation measuring gauge of a reactor upper assembly top cover are needed to solve the technical problem of inconvenience brought by the use of the indentation measuring gauge of the reactor upper assembly top cover.

Disclosure of Invention

The invention aims to design a clamping device and a clamping method for a top cover indentation measuring meter of an upper component of a reactor, which are used for effectively solving the technical problems that the existing indentation measuring meter needs to be held by hands to measure the indentation of the top cover, the operation space is small, the personnel irradiation risk is large, and the error is large.

The technical scheme of the invention is as follows:

a reactor upper assembly top cap indentation measuring gauge clamping device, comprising: the clamping device comprises a clamping component, a supporting spring, an adjusting nut, a movable supporting rod, a fixed supporting rod and a base;

the clamping part is welded with the top of the movable support rod, and the outer wall of the movable support rod is sleeved with a support spring and an adjusting nut from top to bottom in an annular manner; the lower part of the movable supporting rod is inserted into the fixed supporting rod, and the movable supporting rod is fixed on the fixed supporting rod through an adjusting nut; the bottom of the fixed supporting rod is fixedly arranged on the base.

The clamping member includes: the clamping device comprises a movable chuck, a clamping spring, a fixed chuck and a support frame;

the support frame is wholly "U" type structure, and the support frame includes: the left supporting rod, the right supporting rod and the U-shaped opening end; the left support rod is welded with a fixed chuck, the right support rod is provided with an installation through hole, and the movable chuck is arranged on the right support rod by penetrating through the installation through hole on the right support rod; the movable chuck is provided with a clamping spring, and the end part of the movable chuck is also provided with a handle which is used for controlling the movable chuck to move left and right on the right support rod.

The top of the supporting spring is contacted with the clamping part, and the bottom of the supporting spring is contacted with the adjusting nut; the adjusting nut is arranged at the top of the fixed support rod in a threaded manner; the adjusting nut is of a hollow cylinder structure.

The whole cylinder structure that is of activity bracing piece, the activity bracing piece includes: the upper part of the support rod and the lower part of the support rod;

the upper part of the supporting rod penetrates through the adjusting nut and the supporting spring, the lower part of the supporting rod is arranged in the fixed supporting rod, and the lower part of the supporting rod can move up and down in the fixed supporting rod; the diameter of the lower part of the support rod is larger than that of the upper part of the support rod.

The outer wall of the fixed supporting rod is provided with external threads, and the whole fixed supporting rod is of a hollow structure.

The base includes: a bottom plate and a plurality of wheels; the whole bottom plate is of a circular plate-shaped structure; the periphery of the bottom plate is evenly provided with a plurality of wheels along the circumferential direction.

The clamping method of the clamping device for the reactor upper assembly top cover indentation measuring meter comprises the following steps:

the method comprises the following steps: placing a clamping device on the ground near a top cover of the upper assembly, utilizing a handle at the end part of a movable chuck to pull the movable chuck rightwards, enabling the gap between the movable chuck and a fixed chuck to be larger than the width of a measuring meter, placing the measuring meter between the movable chuck and the fixed chuck, loosening the handle, and utilizing the matching of the fixed chuck and the movable chuck to fix the measuring meter on the clamping device under the action of the spring force of a clamping spring;

step two: a worker manually presses down a clamping component for fixing the measuring meter, compresses a supporting spring to enable the measuring meter to be lower than the top cover sealing surface, moves the whole upper component top cover indentation measuring meter clamping device to be below the top cover sealing surface, and slowly releases the clamping component to enable the measuring meter to be tightly attached to the top cover sealing surface; checking the contact condition of the measuring meter and the sealing surface of the top cover, loosening or screwing the adjusting nut to adjust the compression amount of the spring, and adjusting the measuring meter to a proper position;

step three: after the contact position of the measuring meter and the top cover sealing surface is proper, setting the initial value of the measuring meter to be zero, manually moving the top cover indentation measuring meter clamping device of the upper assembly, aligning a measuring rod of the measuring meter to the top cover indentation position, and measuring the top cover indentation depth; after one point is measured, moving the measuring meter to the next measuring point along the indentation position to continue measuring;

step four: after the 108 measurement points are measured, a worker manually presses the clamping component fixed with the measuring meter downwards, compresses the supporting spring to enable the measuring meter to be lower than the top cover sealing surface, moves the clamping device of the top cover indentation measuring meter of the upper assembly out from the lower part of the top cover sealing surface and releases the clamping component; the movable chuck is opened by using the handle, and the measuring meter is detached from the clamping device.

The invention has the technical effects that:

according to the invention, the clamping device for the indentation measuring meter of the top cover of the upper component of the reactor is designed and developed according to the field operation environment and the structural characteristics of the top cover of the upper component, so that the working time can be saved, the exposure dose of personnel can be reduced, and the working efficiency and the measuring precision can be improved; in addition, the invention also has the following effects:

1) the device is provided with the clamping spring, clamping force is provided through the clamping spring, the movable chuck and the fixed chuck are matched to fix the top cover indentation measuring meter of the upper assembly, the measuring meter is convenient and quick to mount and dismount, and the device can adapt to measuring meters with different sizes;

the supporting spring of the device can compensate the height difference caused by measuring with different size measuring meters, and can provide a certain pressing force when the measuring meters are matched with the sealing surface of the top cover;

2) the adjusting nut of the device can conveniently adjust the height of the measuring meter and the matched pressing force of the measuring meter and the top cover sealing surface, ensure that the measuring meter and the top cover sealing surface can be tightly attached, and ensure the measuring precision of the top cover indentation size;

3) the device is provided with the base with smaller thickness and larger area, so that the weight of the whole clamping device is reduced, and the clamping device of the indentation measuring meter of the top cover of the upper component can be moved without toppling;

4) the wheels are designed on the base of the device, and when the top cover indentation of the upper component is measured, the clamping device can be easily moved through the wheels;

5) through using this device to replace the handheld meter of staff to carry out the measurement of upper portion subassembly top cap indentation, reduced staff's work load and physical demands, improved work efficiency, reduced operating time, also reduced the irradiation dose that the staff receives simultaneously.

Drawings

FIG. 1 is a schematic view of a prior art upper assembly top cover sealing to a pressure vessel;

FIG. 2 is a schematic structural view of a clamping device of an indentation measuring gauge of a reactor upper assembly top cover according to the present invention;

FIG. 3 is a schematic view of a clamping member according to the present invention

FIG. 4 is a schematic view of a base structure according to the present invention

FIG. 5 is a schematic view of the structure of the movable support rod of the present invention

FIG. 6 is an assembly drawing of the device of the present invention with a gauge attached

Wherein: 1-upper component top cover, 2-main nut, 3-main bolt, 4-nickel washer, 5-reactor pressure vessel, 6-measuring meter, 8-clamping component, 9-supporting spring, 10-adjusting nut 11-movable supporting rod, 12-fixed supporting rod, 13-base, 14-movable clamping head, 15-clamping spring, 16-fixed clamping head, 17-supporting frame, 18-bottom plate, 19-wheel, 171-left supporting rod, 172-right supporting rod, 111-upper supporting rod part and 112-lower supporting rod

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments,

referring to fig. 1 to 6, a clamping device for an indentation measuring gauge of a reactor upper assembly head comprises: the clamping device comprises a clamping component 8, a supporting spring 9, an adjusting nut 10, a movable supporting rod 11, a fixed supporting rod 12 and a base 13;

the clamping part 8 is welded with the top of the movable support rod 11, and the outer wall of the movable support rod 11 is sleeved with a support spring 9 and an adjusting nut 10 from top to bottom in a sleeved mode; the lower part of the movable supporting rod 11 is inserted into the fixed supporting rod 12, the movable supporting rod 11 can freely move up and down in the fixed supporting rod 12, so that the clamping component 8 is driven to move up and down, and the movable supporting rod 11 is fixed on the fixed supporting rod 12 through the adjusting nut 10; the bottom of the fixed support rod 12 is fixedly arranged on the base 13.

When the top cover indentation of the upper assembly is measured, the measuring meter can be tightly attached to the top cover sealing surface through the supporting spring 9, certain pressing force is guaranteed, measuring accuracy is guaranteed, the compression amount of the spring can be adjusted through loosening or tightening the adjusting nut 10, and then the pressing force of the measuring meter tightly attached to the top cover is adjusted.

The clamp member 8 includes: a movable chuck 14, a clamping spring 15, a fixed chuck 16 and a supporting frame 17; the clamping part 8 is used for clamping the upper assembly top cover indentation measuring meter,

support frame 17 is whole to be "U" type structure, and support frame 17 includes: a left support bar 171, a right support bar 172, and a U-shaped open end; the left support rod 171 is welded with the fixed chuck 16, the right support rod 172 is provided with an installation through hole, the movable chuck 14 is arranged on the right support rod 172 by penetrating through the installation through hole on the right support rod 172, and the movable chuck 14 can move left and right on the right support rod 172; a clamping spring 15 is arranged on the movable clamping head 14 and is used for providing clamping force for clamping the measuring meter;

the end of movable jaw 14 is also provided with a handle for controlling movable jaw 14 to move left and right on right support bar 172.

When the clamping device is used, the movable chuck 14 is pulled rightwards by the handle, the measuring meter is placed between the movable chuck 14 and the fixed chuck 16, the small handle is loosened, and the measuring meter is clamped by the cooperation of the fixed chuck 16 and the movable chuck 14 under the spring force action of the clamping spring 15.

The top of the supporting spring 9 is contacted with the clamping part 8, and the bottom of the supporting spring 9 is contacted with the adjusting nut 10; the adjusting nut 10 is installed on the top of the fixed support rod 12 in a threaded manner; the adjusting nut 10 is a hollow cylinder structure. The diameter of the central hole at the lower part of the adjusting nut 10 is matched with the diameter of the outer wall of the fixed support rod 12.

The whole cylinder structure that is of activity bracing piece 11, activity bracing piece 11 includes: a strut upper portion 111 and a strut lower portion 112;

the upper part 111 of the support rod passes through the adjusting nut 10 and the support spring 9, the lower part 112 of the support rod is arranged inside the fixed support rod 12, and the lower part 112 of the support rod can move up and down in the fixed support rod 12; the diameter of the lower portion 112 of the support pole is larger than that of the upper portion 111 of the support pole.

The diameter of the lower portion 112 of the support rod is larger than the diameter of the central hole of the upper portion of the adjusting nut 10 for preventing the clamping member 8, the support spring 9 and the movable support rod 11 from falling off during the transportation of the clamping device.

The outer wall of the fixed support rod 12 is provided with external threads, and the whole fixed support rod 12 is of a hollow structure.

The base 13 includes: a base plate 18 and a plurality of wheels 19; the whole bottom plate 18 is of a circular plate-shaped structure, and the bottom plate 18 has a large area, so that the clamping device of the upper component top cover indentation measuring meter is prevented from falling down when moving.

The bottom periphery of the bottom plate 18 is evenly provided with a plurality of wheels 19 along the circumferential direction, and when the top cover indentation of the upper assembly is measured, the clamping device can be easily moved through the wheels.

The clamping method of the clamping device for the reactor upper assembly top cover indentation measuring meter comprises the following steps:

the method comprises the following steps: placing a clamping device on the ground near a top cover of the upper assembly, utilizing a handle at the end part of a movable chuck to pull the movable chuck rightwards, enabling the gap between the movable chuck and a fixed chuck to be larger than the width of a measuring meter, placing the measuring meter between the movable chuck and the fixed chuck, loosening the handle, and utilizing the matching of the fixed chuck and the movable chuck to fix the measuring meter on the clamping device under the action of the spring force of a clamping spring;

step two: a worker manually presses down a clamping component for fixing the measuring meter, compresses a supporting spring to enable the measuring meter to be lower than the top cover sealing surface, moves the whole upper component top cover indentation measuring meter clamping device to be below the top cover sealing surface, and slowly releases the clamping component to enable the measuring meter to be tightly attached to the top cover sealing surface; checking the contact condition of the measuring meter and the sealing surface of the top cover, loosening or screwing the adjusting nut to adjust the compression amount of the spring, and adjusting the measuring meter to a proper position;

step three: after the contact position of the measuring meter and the top cover sealing surface is proper, setting the initial value of the measuring meter to be zero, manually moving the top cover indentation measuring meter clamping device of the upper assembly, aligning a measuring rod of the measuring meter to the top cover indentation position, and measuring the top cover indentation depth; after one point is measured, moving the measuring meter to the next measuring point along the indentation position to continue measuring;

step four: after the 108 measurement points are measured, a worker manually presses the clamping component fixed with the measuring meter downwards, compresses the supporting spring to enable the measuring meter to be lower than the top cover sealing surface, moves the clamping device of the top cover indentation measuring meter of the upper assembly out from the lower part of the top cover sealing surface and releases the clamping component; the movable chuck is opened by using the handle, and the measuring meter is detached from the clamping device.

The clamping device for the upper assembly top cover indentation measuring meter, which is designed by the invention, solves the defects in the existing upper assembly top cover indentation measuring process, saves the working time, reduces the exposure dose of personnel, and improves the working efficiency and the measuring precision. The device can be used in the related work of the same type of unit, can be popularized to the measurement work of other similar equipment in a power station, and has good reference significance for the measurement work of other similar equipment in the same industry.

The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.