阅读说明：本技术 一种椭圆形自密封人孔盖板拆装装置 (Oval self sealss manhole cover plate dismouting device ) 是由 周伟 杜岩松 顾为柏 王成林 翁云峰 费志松 黄慧敏 王彦 孙勤 朱明胜 周华兴 于 2018-08-22 设计创作，主要内容包括：本发明属于核电维修技术领域,具体涉及一种椭圆形自密封人孔盖板拆装装置。该装置通过旋转直线运动机构中的手轮使得大滑板做直线运动,从而带动人孔盖板进、出加热器等容器的人孔门；通过翻转机构中的手轮旋转使得翻转板做翻转运动,从而带动人孔盖板翻转；旋转机构可以很轻松方便的使人孔盖板做出旋转运动；通过4部分机构的相互配合使用,可以轻松、方便、安全、高效、高质量的完成椭圆形自密封人孔盖板的拆装。该装置具有轻便可靠、安全易操作的特点,能够有效降低检修人员操作难度,保证人孔盖板及密封垫片在回装时维修质量；提高现场操作安全性,避免事故发生；减少工作准备时间,提高现场检修效率,为电站大修工作的顺利完成提供有力保障。(The invention belongs to the technical field of nuclear power maintenance, and particularly relates to a dismounting device for an oval self-sealing manhole cover plate. The device makes the large sliding plate do linear motion by rotating a hand wheel in the linear motion mechanism, so as to drive the manhole cover plate to enter and exit a manhole door of a heater and other containers; the turnover plate is turned over by the rotation of a hand wheel in the turnover mechanism, so that the manhole cover plate is driven to turn over; the rotating mechanism can easily and conveniently make the manhole cover plate rotate; through the mutual cooperation of 4 parts of mechanisms, the disassembly and assembly of the oval self-sealing manhole cover plate can be easily, conveniently, safely, efficiently and high-quality completed. The device has the characteristics of portability, reliability, safety and easy operation, can effectively reduce the operation difficulty of maintainers, and ensures the maintenance quality of the manhole cover plate and the sealing gasket during the repacking; the safety of field operation is improved, and accidents are avoided; the work preparation time is shortened, the on-site maintenance efficiency is improved, and powerful guarantee is provided for smooth completion of the overhaul work of the power station.)

1. The utility model provides an oval self sealss manhole cover dismouting device which characterized in that: comprises a part supporting mechanism, a linear motion mechanism, a turnover mechanism and a rotating mechanism; wherein the content of the first and second substances,

the lower supporting mechanism comprises a supporting plate and a bracket, and the bracket is fixed at the lower part of the supporting plate and is used for supporting the weight of the supporting plate and connecting the oval manhole cover plate;

the linear motion mechanism comprises a large sliding plate, a linear guide rail, a sliding block, a screw rod, a linear motion hand wheel and a screw nut; two linear guide rails are fixed on two sides of the supporting plate, two groups of sliding blocks are sleeved on the two linear guide rails through clearance fit, and the large sliding plate is fixed on the two groups of sliding blocks; a round through hole is formed in the large sliding plate, a nut is fixed in the round through hole at the tail of the large sliding plate, and a screw rod is screwed into the nut from the head to penetrate through the belly of the large sliding plate; a linear motion hand wheel is arranged at the tail end of the screw rod; the lead screw is driven to rotate by shaking the linear motion hand wheel, and the large sliding plate is driven to do linear motion of advancing or retreating along the linear guide rail by matching with a nut;

the turnover mechanism comprises a head worm wheel, a head worm wheel support, a bearing, a turnover shaft, a head worm wheel seat, a tail worm, a turnover plate, a head worm, a transmission shaft, a tail worm wheel and the like; the head worm seat is used for supporting the weight of the worm, a circular through hole is formed in the middle of the head worm seat, and the head worm seat is fixed above the head of the large sliding plate; the head worm is arranged in the circular through hole of the head worm seat, and the tail section of the head worm is connected with the head of the transmission shaft; the head worm wheel supports are fixed on two sides of the head of the large sliding plate, the turnover shaft of the head worm wheel is fixed on the head worm wheel supports through bearings, and the head worm wheel is fixed on the turnover plate; the tail turbine seat is fixed above the tail of the large sliding plate, the tail turbine is connected with the tail of the transmission shaft, the tail worm is installed on the tail turbine seat through a bearing, and one end of the tail worm is provided with an overturning moving hand wheel; the tail worm rotates by rotating the hand wheel to drive the tail worm wheel, the transmission shaft and the head worm to rotate together, and the head worm wheel and the turnover plate are driven to do turnover movement by meshing of the head worm and the head worm wheel, so that the manhole cover plate is turned over;

the rotating mechanism comprises a rotating bearing; the turning plate is provided with a rotary bearing, and the turning plate is connected with a central threaded hole of the manhole cover plate through a bolt in a rotating mode, so that the manhole cover plate is disassembled and assembled.

2. The elliptical self-sealing manhole cover plate assembly and disassembly device of claim 1, wherein: the rotating mechanism further comprises a cover plate bearing support, wherein the cover plate bearing support is fixed above the middle of the large sliding plate and used for supporting the weight of the manhole cover plate before overturning.

3. The device for assembling and disassembling an oval self-sealing manhole cover plate according to claim 2, wherein: and the cover plate bearing support is provided with a roller bearing for reducing the friction force when the manhole cover plate rotates.

4. The device for assembling and disassembling an oval self-sealing manhole cover plate according to claim 1 or 2, wherein: the whole large sliding plate is of a long strip-shaped structure with a T-shaped cross section, and the top of the sliding block is fixedly connected with the lower bottom surface of the flat plate structure at the head of the large sliding plate through screws and is used for supporting the weight of the large sliding plate and the weight of each part installed on the large sliding plate.

5. The device for assembling and disassembling an oval self-sealing manhole cover plate according to claim 1 or 2, wherein: the bottom of the big skateboard is provided with a roller bearing CF8 for reducing the motion resistance of the big skateboard in the loading process.

6. The device for assembling and disassembling an oval self-sealing manhole cover plate according to claim 1 or 2, wherein: the tail of the screw rod is provided with a bearing, the bearing is fixed in a tail bearing seat, and the tail bearing seat is fixed at the tail end of the supporting plate.

7. The elliptical self-sealing manhole cover plate assembly and disassembly device of claim 1, wherein: the two head worm seats are of inverted T-shaped structures, and the diameter of each through hole is matched with the outer diameter of each head worm seat; the head worm is arranged in the two head worm seats through a copper sleeve.

8. The device for assembling and disassembling an oval self-sealing manhole cover plate according to claim 1 or 7, wherein: the tail part of the transmission shaft penetrates through the two copper sleeves which are matched with each other, one copper sleeve is arranged at the tail part of the transmission shaft, and the other copper sleeve is arranged on the tail part turbine seat.

9. The device for assembling and disassembling an oval self-sealing manhole cover plate according to claim 1 or 7, wherein: the drive shaft rear end is tightened with a washer 10 and nut to prevent the rear turbine from loosening.

10. The device for assembling and disassembling an oval self-sealing manhole cover plate according to claim 1 or 2, wherein: two anti-tilt plates are further mounted on two sides of the bracket, two bolts are mounted on two sides of the head of the large sliding plate and used as buckles of the anti-tilt plates, and grooves are formed in corresponding positions of the anti-tilt plates and used for limiting and preventing the large sliding plate from toppling.

Technical Field

The invention belongs to the technical field of nuclear power maintenance, and particularly relates to a dismounting device for an oval self-sealing manhole cover plate.

Background

The high-low pressure heater is a heat exchanger equipment of power plant unit, and its main application is that it adopts steam turbine to extract steam to heat feed water, collects the drained water of steam-water separation reheater and discharges the non-condensable gas into deaerator so as to reduce the heat loss of steam turbine exhaust, make full use of steam heat energy and raise the heat efficiency of power plant unit.

The manhole cover plates of the high-pressure heater and the low-pressure heater are positioned right in front of the high-pressure heater and the low-pressure heater, and the specific positions are shown in figure 1. The manhole cover plate of the high-pressure heater and the manhole cover plate of the low-pressure heater are of self-sealing oval structures, namely, the manhole cover plate is closed by external pulling force inside a container, and is sealed by pressure of internal media under actual operation working conditions. The manhole cover plate of the high-pressure heater and the low-pressure heater has the weight of 120Kg and is shaped as shown in figures 2 and 3. In addition, the manhole door of the high-pressure heater and the low-pressure heater is narrow, so that the disassembly and assembly work of the manhole cover plate inside can be realized only by external operation.

The manhole cover plate can only enter and exit the inside of the manhole door along the long edge direction of the ellipse due to the special limitation of the manhole cover plate structure of the high-pressure heater and the low-pressure heater, and the manhole cover plate can carry out final operations of centering, closing, sealing and the like after rotating and overturning inside the container. As shown in fig. 1, the interface position of the inlet pipeline of the container and the container is arranged right below the manhole cover plate of the high-low pressure heater, so that the risk that the manhole cover plate falls into the pipeline exists; when the manhole cover plate of the high-pressure heater, the low-pressure heater or the container equipment is disassembled and assembled, certain falling risk exists, and personnel and equipment are damaged. The manhole cover plate is difficult to disassemble and assemble, and risks of centering difficulty of a manhole sealing surface, easy falling, damage and the like of a sealing gasket exist during reinstallation, so that the manhole door can be leaked after water enters the high-low pressure heater, and the risk of power reduction or shutdown exists. Therefore, a set of special device which can meet the requirements of manhole cover plate dismounting and is capable of guaranteeing the centering of the manhole cover plates of the high-pressure heater and the low-pressure heater is designed and manufactured, the operation difficulty of dismounting and mounting of the manhole cover plates of the high-pressure heater and the low-pressure heater on site can be greatly reduced, the overhauling efficiency is improved, the investment of manpower and material resources is reduced, the potential safety hazard of operation is eliminated, and the safety of personnel and equipment is guaranteed.

Disclosure of Invention

The invention aims to provide a dismounting device for an oval self-sealing manhole cover plate, aiming at solving the problem that the oval manhole cover plate is difficult to dismount.

The technical scheme of the invention is as follows:

an elliptical self-sealing manhole cover plate dismounting device comprises a supporting mechanism, a linear motion mechanism, a turnover mechanism and a rotating mechanism; the lower supporting mechanism comprises a supporting plate and a bracket, wherein the bracket is fixed at the lower part of the supporting plate and is used for supporting the weight of the supporting plate and connecting the oval manhole cover plate; the linear motion mechanism comprises a large sliding plate, a linear guide rail, a sliding block, a screw rod, a linear motion hand wheel and a screw nut; two linear guide rails are fixed on two sides of the supporting plate, two groups of sliding blocks are sleeved on the two linear guide rails through clearance fit, each group of sliding blocks comprises one or more sliding blocks, and the large sliding plate is fixed on the two groups of sliding blocks; a round through hole is formed in the large sliding plate, a nut is fixed in the round through hole at the tail of the large sliding plate, and a screw rod is screwed into the nut from the head to penetrate through the belly of the large sliding plate; a linear motion hand wheel is arranged at the tail end of the screw rod; the turnover mechanism comprises a head worm wheel, a head worm wheel support, a bearing, a turnover shaft, a head worm wheel seat, a tail worm, a turnover plate, a head worm, a transmission shaft, a tail worm wheel and the like; the head worm seat is used for supporting the weight of the worm, a circular through hole is formed in the middle of the head worm seat, and the head worm seat is fixed above the head of the large sliding plate; the head worm is arranged in the circular through hole of the head worm seat, and the tail section of the head worm is connected with the head of the transmission shaft; the head worm wheel supports are fixed on two sides of the head of the large sliding plate, the turnover shaft of the head worm wheel is fixed on the head worm wheel supports through bearings, and the head worm wheel is fixed on the turnover plate; the tail turbine seat is fixed above the tail of the large sliding plate, the tail turbine is connected with the tail of the transmission shaft, the tail worm is installed on the tail turbine seat through a bearing, and one end of the tail worm is provided with an overturning moving hand wheel; the tail worm rotates by rotating the hand wheel to drive the tail worm wheel, the transmission shaft and the head worm to rotate together, and the head worm wheel and the turnover plate are driven to do turnover movement by meshing of the head worm and the head worm wheel, so that the manhole cover plate is turned over; the rotating mechanism comprises a rotating bearing; the turning plate is provided with a rotary bearing, and the turning plate is connected with a central threaded hole of the manhole cover plate through a bolt in a rotating mode, so that the manhole cover plate is disassembled and assembled.

The rotating mechanism further comprises a cover plate bearing support, wherein the cover plate bearing support is fixed above the middle of the large sliding plate and used for supporting the weight of the manhole cover plate before overturning.

And the cover plate bearing support is provided with a roller bearing for reducing the friction force when the manhole cover plate rotates.

The whole large sliding plate is of a long strip-shaped structure with a T-shaped cross section, and the top of the sliding block is fixedly connected with the lower bottom surface of the flat plate structure at the head of the large sliding plate through screws and is used for supporting the weight of the large sliding plate and the weight of each part installed on the large sliding plate.

The bottom of the big skateboard is provided with a roller bearing CF8 for reducing the motion resistance of the big skateboard in the loading process.

The tail of the screw rod is provided with a bearing, the bearing is fixed in a tail bearing seat, and the tail bearing seat is fixed at the tail end of the supporting plate.

The two head worm seats are of inverted T-shaped structures, and the diameter of each through hole is matched with the outer diameter of each head worm seat; the head worm is arranged in the two head worm seats through a copper sleeve.

The tail part of the transmission shaft penetrates through the two copper sleeves which are matched with each other, one copper sleeve is arranged at the tail part of the transmission shaft, and the other copper sleeve is arranged on the tail part turbine seat.

The tail end of the transmission shaft is screwed down by a washer and a nut to prevent the tail turbine from loosening.

Two anti-tilt plates are further mounted on two sides of the bracket, two bolts are mounted on two sides of the head of the large sliding plate and used as buckles of the anti-tilt plates, and grooves are formed in corresponding positions of the anti-tilt plates and used for limiting and preventing the large sliding plate from toppling.

The invention has the beneficial effects that:

the device for disassembling and assembling the elliptical self-sealing manhole cover plate can easily, reliably and safely realize the disassembly and assembly of the elliptical self-sealing manhole cover plate of a high-pressure heater, a low-pressure heater or the like, and has the characteristics of light weight, small size, easiness in operation, reliability and safety. The technical scheme can effectively reduce the operation difficulty of maintainers and ensure the maintenance quality of the manhole cover plate and the sealing gasket during the reinstallation; the safety of field operation is improved, and accidents are avoided; the work preparation time is shortened, the on-site maintenance efficiency is improved, and powerful guarantee is provided for successfully completing the overhaul work of the power station.

Drawings

FIG. 1 is a schematic view of the location of a manhole cover for high and low pressure heaters;

FIG. 2 is a schematic view of the manhole cover of the high and low pressure heaters of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the manhole cover of the high and low pressure heaters of FIG. 2;

FIG. 4 is a schematic three-dimensional structure diagram of the device for assembling and disassembling the elliptical self-sealing manhole cover plate according to the present invention;

FIG. 5 is a front view of the elliptical self-sealing manhole cover removal device of the present invention;

FIG. 6 is a top view of the elliptical self-sealing manhole cover removal device of the present invention;

FIG. 7 is a partial cross-sectional view of FIG. 4; FIG. 8 is a schematic view of the shape of the large slide plate of FIG. 4;

FIG. 9 is a cross-sectional view taken along A-A of FIG. 7;

FIG. 10 is a schematic view of the shape of the roll-over panel of FIG. 7;

FIG. 11 is a cross-sectional view taken along line B-B of FIG. 7;

FIG. 12 is a schematic aft turbine bucket shape.

In the figure: 1-manhole cover plate, 2-bracket, 3-supporting plate, 4-big sliding plate, 5-linear guide rail, 6-sliding block, 7-screw rod, 8-linear motion hand wheel, 9-screw nut, 10-tail bearing seat, 11-roller bearing, 12-head worm wheel, 13-head worm wheel support, 14-head worm wheel seat, 15-head worm, 16-tail worm wheel seat, 17-tail worm, 18-turnover plate, 19-tail worm wheel, 20-transmission shaft, 21-turnover motion hand wheel, 22-anti-tilt plate and 23-cover plate support.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

This embodiment provides an oval self sealss manhole cover board dismouting device, adopts novel aviation aluminum product to make, and its structure is as shown in fig. 4, fig. 5, fig. 6 and fig. 7, including lower part supporting mechanism, linear motion mechanism, tilting mechanism and rotary mechanism.

Lower part supporting mechanism

The lower supporting mechanism mainly comprises a supporting plate 3, a bracket 2 and the like; the supporting plate is in a strip shape and is a main body structure of the lower supporting mechanism; the bracket 2 is mainly used for supporting the weight of the supporting plate and connecting the oval manhole cover plate and is of a trapezoidal frame structure, as shown in fig. 4; the upper bottom edge of the bracket 2 is fixed at the lower part of the supporting plate 3 through 5M 12 internal hexagonal screws and washers with 20mm, and the disassembly and assembly of the manhole cover plates of the containers with different depths can be met by adjusting the position of the bracket 2 at the lower part of the supporting plate 3; the lower bottom edge of the bracket 2 is connected with two threaded bottom holes below the manhole cover plate 1 of the high-pressure heater and the low-pressure heater through two M24 × 36mm hexagon bolts, so that the dismounting device is fixed on the body of the high-pressure heater and the low-pressure heater.

(II) linear motion mechanism

The linear motion mechanism mainly comprises a large sliding plate 4, a linear guide rail 5, a sliding block 6, a screw rod 7, a linear motion hand wheel 8, a screw nut 9, a tail bearing seat 10 and the like;

two linear guide rails 5 with the length of 950mm are fixed on two sides of the supporting plate 3 through 32M 4 x 18mm hexagon socket head cap screws; the 6 sliding blocks 6 are sleeved on the two linear guide rails 5 in a clearance fit manner, 3 sliding blocks 6 are installed on each linear guide rail 5, then the 6 sliding blocks 6 are divided into two groups and fixed on the large sliding plate 4 through 24M 4 × 14mm hexagon socket head cap screws, each group of 3 sliding blocks is fixed by 4 screws;

the shape of the large sliding plate 4 is shown in figure 8, the whole body is of a long strip-shaped structure with a T-shaped cross section, and a circular through hole is formed in the large sliding plate; the top of the sliding block is fixedly connected with the lower bottom surface of the flat plate structure at the head of the large sliding plate through a screw, and is used for supporting the weight of the large sliding plate and parts arranged on the large sliding plate; as shown in fig. 9, two sets of spacers and roller bearings 11 are installed at the bottom of the large sliding plate 9 to reduce the motion resistance of the large sliding plate 4 in the loading process;

as shown in fig. 4 and 7, the left end is referred to as the head of the large slide plate 4, the lead screw 7, the support plate 45, and the like, and the right end is referred to as the tail. As shown in fig. 9, the nut 9 is fixed inside the circular through hole at the tail of the large sliding plate 4 by 1M 5 × 18mm of set screw, and the screw rod 7 is screwed into the nut 9 from the head so as to penetrate through the belly of the large sliding plate 4; the tail of the screw rod 7 is arranged in 2 bearings with the same model as the bearings 6001-Z, the two bearings are arranged in a tail bearing seat 10 and used for supporting the screw rod and keeping the screw rod horizontal, and the tail bearing seat is fixed at the right end of the supporting plate 3 through 2M 5 x 16mm hexagon socket head cap screws; a straight-line motion hand wheel 8 with the diameter of phi 150mm is arranged at the tail end of the screw rod 7 through a flat key, a retainer ring and an inner hexagon screw with the diameter of M5 x 12 mm; a spacer bush is also arranged between the linear motion hand wheel 8 and the bearing at the tail part of the screw rod 7;

in conclusion, the screw rod 7 can be driven to rotate by shaking the linear motion hand wheel 8, and the large sliding plate 9 is driven to move forwards or backwards linearly along the linear guide rail 5 by matching with the screw nut 9.

(III) turnover mechanism

The turnover mechanism comprises a head worm wheel 12, a head worm wheel support 13, a turnover shaft phi 12 x 90mm, a head worm seat 14, a head worm 15, a tail worm seat 16, a tail worm 17, a turnover plate 18, a tail worm 19, a transmission shaft 20, a turnover motion hand wheel 21 and the like;

as shown in fig. 4, 7 and 9, the number of the head worm seats 14 is two, the head worm seats are used for supporting the weight of the head worm 12, the head worm seats are of an inverted T-shaped structure, a circular through hole is arranged in the middle of the head worm seats, and the diameter of the through hole is matched with the outer diameter of the head worm 12; the two head worm seats 14 are fixed above the head of the large sliding plate 4 by 4M 5 × 16mm socket head cap screws. As shown in fig. 9, the head worm 15 is mounted in the two head worm seats 14 by means of a copper bush; the tail section of the head worm 15 is a square head and is connected with the head of the transmission shaft 20.

As shown in fig. 9, the two head turbine supports 13 are symmetrically arranged long-strip plate-shaped structures, and are fixed on the two sides of the head of the large sliding plate 4 through two pins phi 5 × 18mm, and the turning shaft phi 12 × 90mm of the head turbine 15 is fixed on the head turbine supports 13 through two sets of space rings and bearings; fixing the head worm wheel 15 on the turnover plate 18 by a pin of phi 4 x 50mm, so that the turnover plate 18 and the head worm wheel 15 are fixed on the head worm wheel support 13 together; the roll-over panel 18 is shaped as shown in figure 10.

As shown in fig. 7, 11 and 12, the rear turbine seat 16 is substantially rectangular, a step is designed below the rear turbine seat 16 for being clamped at the rear of the large sliding plate 4, a groove is designed in the middle of the rear turbine seat, coaxial stepped holes are respectively designed at two sides of the rear turbine seat, and a through hole is designed at the front of the rear turbine seat. Fixing the tail turbine seat 16 above the tail of the large sliding plate 4 by using two M5 × 50mm hexagon socket head cap screws; the tail part of the transmission shaft 20 penetrates through two copper sleeves which are matched with each other, one copper sleeve is arranged at the tail part of the transmission shaft, the other copper sleeve is arranged on the tail part turbine seat 16, and the copper sleeves are mainly used for supporting the transmission shaft; then the tail turbine 19 is connected with the tail part of the transmission shaft 20 through a flat key, and the copper bush and the tail turbine 19 are separated by a spacer bush; a washer and nut are tightened on the rear end of the drive shaft 20 to prevent the rear turbine 19 from loosening.

As shown in fig. 11, the tail worm 21 is mounted on the tail turbine seat 16 through two bearings, one end of the tail worm 21 is provided with the reverse movement hand wheel 21 by using an M5 × 12mm socket head cap screw, a retainer 540 and a flat key 41, and the outer side of the bearing at the other end is provided with a hole retainer; two anti-tipping plates 22 are arranged on two sides of the bracket 2 through 4M 6 internal hexagonal bolts with the diameter of 20mm, two M5 internal hexagonal bolts with the diameter of 16mm are arranged on two sides of the head of the large sliding plate 4 and used as buckles of the anti-tipping plates 22, and grooves are arranged at corresponding positions of the anti-tipping plates and used for limiting and preventing the large sliding plate from tipping.

In summary, the hand wheel is rotated to rotate the tail worm 21, so as to drive the tail worm wheel 19, the transmission shaft 20 and the head worm 15 to rotate together, and the head worm wheel 15 and the turnover plate 18 are driven to turn over through the meshing of the head worm wheel 15 and the head worm wheel 15, so that the turnover of the manhole cover plate is realized.

(IV) rotating mechanism

The rotating mechanism comprises a cover plate bearing support 23, a rotating bearing 24 and the like;

as shown in fig. 4, two rotating bearings 24 are symmetrically installed in the bearing seats of the flipping plate 18, and a hexagon bolt passing through M24 × 36mm passes through the rotating bearings 61905-2Z to connect the flipping plate 18 with the central threaded hole (as shown in fig. 2 and 3) of the manhole cover plate, so that the manhole cover plate is disassembled and assembled; the arrangement of the bearing can reduce the resistance of the manhole cover plate in the rotating process, so that the manhole cover plate can be easily rotated by hands completely.

As shown in fig. 4, a cover plate support 23 is fixed above the middle part of the large sliding plate 4 through two M5 × 18mm socket head cap screws for supporting the weight of the manhole cover plate before turning; as shown in fig. 11, roller bearings NTARSS are mounted on the deck support mount 23 by pins of phi 5 x 20mm to reduce friction during rotation of the manhole cover.

The operating principle of the oval self-sealing manhole cover plate dismounting device of the embodiment is as follows: the dismounting device for the oval self-sealing manhole cover plate of the high-pressure heater and the low-pressure heater is characterized in that a bracket 2 is connected with two threaded bottom holes below the manhole cover plate of the high-pressure heater and the low-pressure heater through two M24-36 mm hexagon bolts, so that the dismounting device is fixed on bodies of the high-pressure heater and the low-pressure heater; the turnover plate 18 is connected with a central threaded hole (shown in figure 2) of the manhole cover plate by penetrating a hexagon bolt with the diameter of M24 and 36mm through a bearing 61905-2Z, so that the manhole cover plate dismounting device is connected with the manhole cover plate; the hand wheel 8 in the linear motion mechanism is rotated to make the large sliding plate 4 do linear motion; thereby driving the manhole cover plate to enter and exit from manhole doors of high and low pressure heaters and other containers; the turnover plate 18 is turned over by the rotation of a hand wheel 21 in the turnover mechanism, so that the manhole cover plate is driven to turn over; the rotating mechanism can easily and conveniently make the manhole cover plate rotate; through the mutual cooperation of 4 parts of mechanisms, the disassembly and assembly of the oval self-sealing manhole cover plate (or the manhole cover plate of the container) of the high-pressure heater and the low-pressure heater can be easily, conveniently, safely, efficiently and high-quality completed.

The oval self sealss manhole cover plate dismouting device of this embodiment adopts novel aviation aluminum product to make, and a whole set of weight is below 30Kg, small, and the instrument is simple to use, convenient, satisfies just can take alone and accomplish the dismouting of being connected of dismouting device and high, low pressure feed water heater body. The device connects the lower bracket of the dismounting device with the bolt bottom hole on the body below the manhole door of the high-low pressure heater through two M24 × 36mm bolts, thereby completing the mounting of the manhole cover plate dismounting device. The size of the device is 950 × 100 × 332mm, the maximum linear motion stroke of the manhole cover plate disassembling tool is 680mm, the turning angle of the turning plate 24 is 90 degrees, the rotation angle of the manhole cover plate is 360 degrees, and the maximum load capacity of the supporting structure is 300 Kg.

The whole track of the oval self-sealing manhole cover plate dismounting device of the embodiment adopts a high-precision linear guide rail, and the manhole cover plate can be pushed in or taken out easily and freely by rotating the screw rod through the hand wheel, so that semi-automation is realized. The manhole cover plate is oval, so that the manhole cover plate needs to enter and exit the high-pressure heater and the low-pressure heater along the long edge of the manhole cover plate; after entering, the manhole cover plate is turned from the horizontal position to the vertical position (or the vertical position is turned to the horizontal position) by using a worm gear and worm and other mechanisms. The rotating platform (or the turnover plate) is designed at the top end of the manhole cover plate dismounting device by utilizing double bearings, so that the manhole cover plate can be easily rotated in the high-pressure heater and the low-pressure heater.

Through adjusting the position of bracket on the lower part layer board, can satisfy the dismouting of this kind of container manhole apron of different degree of depth, for example, the difference of the high, low pressure heater manhole apron degree of depth of square jiashan nuclear power generating set is 70mm, and the dismouting that satisfies low pressure heater manhole apron after the same dismouting device adjustment bracket is in the position on the lower part layer board.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.