CN215479463U - Manhole door lifting device for nuclear power generator - Google Patents

Abstract

The utility model relates to a manhole door lifting device for a nuclear power generator, which comprises a chassis, a telescopic device, a driving device and a supporting platform, wherein the chassis is provided with a support plate; the support table is fixedly connected to the top end of the telescopic device and can move along the axial direction when the telescopic device does axial telescopic motion; the telescopic device comprises a screw rod, a gear assembly in meshed connection with the bottom end of the screw rod and a lifting sleeve assembly; the lifting sleeve component comprises a plurality of threaded sleeves, any two adjacent threaded sleeves are in threaded connection, and the threaded sleeve below the threaded sleeve can stretch out and draw back in the hollow hole of the threaded sleeve above the threaded sleeve; the driving device is connected with the gear assembly to drive the gear assembly to rotate, and further drives the threaded sleeve to do axial telescopic motion along the screw rod; the support table is also connected with at least one fixer for limiting the displacement of the manhole door, so that the working strength of workers can be effectively reduced, the risk of smashing the workers is avoided, and the safety of the workers is ensured; the labor cost can be saved, and the whole working period is shortened.

Description

Manhole door lifting device for nuclear power generator

Technical Field

The utility model relates to the field of hoisting tools, in particular to a manhole door lifting device for a nuclear power generator.

Background

The bottom of the QFSN-1100-4 type generator is provided with 20 manhole doors, so that workers can conveniently check the condition of the back of the stator core of the generator.

The weight of a single manhole door is about 80KG, the length is about 70CM, the width is about 60CM, and the distance between the manhole door and the grid net is 1.5M; during the maintenance of the generator, a manhole door needs to be removed for relevant inspection; the manhole door needs to be installed again after the overhaul is finished; when the disassembly or the reinstallation work is carried out, two workers are generally required to support the bottom of the manhole door below the manhole door, and the other two workers are required to semi-bend at the side edges to disassemble or assemble the fixing bolts; in the process of reloading, workers are required to align the hole positions on the manhole door to the fixing bolts and adjust the positions of the bolts, so that time and labor are consumed.

In the whole working process, due to limited space, workers are basically in a half-squatting state or a full-squatting state, and the number of the hole doors needing to be disassembled and assembled is large, so that the working strength is high, and the workers are easy to fatigue; if the staff does not hold the manhole door, cause the manhole door to fall, can have the risk of injuring the personnel by a crashing object.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to solve the technical problems that the manhole door of the existing nuclear power generator needs to be lifted manually in the dismounting process, is time-consuming and labor-consuming and has danger.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a manhole door lifting device for a nuclear power generator is constructed, and comprises a chassis, a telescopic device, a driving device and a supporting table, wherein the chassis plays a supporting role, the telescopic device is arranged on the chassis, and the supporting table is used for abutting against and supporting a manhole door; the supporting table is fixedly connected to the top end of the telescopic device and can move along the axial direction when the telescopic device does axial telescopic motion;

the telescopic device comprises a screw rod, a gear assembly in meshed connection with the bottom end of the screw rod and a lifting sleeve assembly; the lifting sleeve assembly comprises a plurality of threaded sleeves, any two adjacent threaded sleeves are in threaded connection, the threaded sleeve below the threaded sleeve can stretch out and draw back in the hollow hole of the threaded sleeve above the threaded sleeve, and the top end of the threaded sleeve below the threaded sleeve is provided with a first limiting piece for driving the threaded sleeve above the threaded sleeve to rotate; the support table is connected with the threaded sleeve at the head end, and the screw rod penetrates through the threaded sleeve at the tail end and is in threaded connection with the threaded sleeve; the screw rod is also provided with a second limiting piece which drives the threaded sleeve at the tail end to rotate; the driving device is connected with the gear assembly to drive the gear assembly to rotate, and the gear assembly drives the screw rod to rotate so as to drive the threaded sleeve to do axial telescopic motion along the screw rod;

the support platform is further connected with at least one fixer for limiting the displacement of the manhole door.

Preferably, the lifting sleeve assembly further comprises a plurality of sleeve members sleeved outside the threaded sleeve, and in any two adjacent sleeve members, the sleeve member above the sleeve member can extend and contract in the middle hole of the sleeve member below the sleeve member; the upper sleeve part is also provided with a third limiting part for limiting the lower sleeve part to be separated;

the threaded sleeve at the head end penetrates through the sleeve part at the head end and is fixedly connected with the sleeve part so as to drive the sleeve part to do axial telescopic motion when the threaded sleeve is in telescopic motion; the sleeve part at the head end is fixedly connected with the supporting table, and the sleeve part at the bottom end is fixedly connected with the chassis.

Preferably, the gear assembly comprises a first bevel gear and a second bevel gear in meshed connection with the first bevel gear; the first bevel gear is sleeved at the bottom end of the screw and connected with the screw; the second bevel gear is connected with the driving device, and the driving device drives the second bevel gear to rotate so as to transmit the rotation to the first bevel gear to drive the screw to rotate.

Preferably, the holder comprises a magnetic socket; the magnetic base comprises a first magnet, a second magnet, a third magnet and a rotating handle capable of controlling the second magnet to rotate; the first magnet and the third magnet are connected in a spaced manner through a copper plate, and an accommodating space for accommodating the second magnet is also arranged between the first magnet and the third magnet; the rotating handle can rotate the second magnet to enable two ends of the second magnet to be respectively abutted to the first magnet and the third magnet.

Preferably, the bottom of the support table is further provided with a first connecting piece for fixing the magnetic base; the vertical part and the horizontal part of the first connecting piece are of L-shaped structures; the horizontal part is fixedly connected with the bottom of the supporting table, and the vertical part is fixedly connected with the magnetic seat.

Preferably, the first limiting member includes a first ratchet structure connected to a top end thereof in an axial direction of the lower threaded sleeve; the second limiting member comprises a second ratchet structure which is connected to the top end of the screw rod along the axial direction of the screw rod;

the bottom end of the upper threaded sleeve shaft is abutted against a first ratchet structure, and the upper threaded sleeve rotates along with the lower threaded sleeve;

the bottom end of the threaded sleeve at the tail end is abutted to the second ratchet structure, and the threaded sleeve at the tail end rotates along with the screw rod.

Preferably, the inner wall of the second hollow hole of the sleeve member is provided with a first protruding member protruding in the radial direction of the sleeve member, the outer wall of the sleeve member is provided with a third groove recessed in the radial direction of the sleeve member, and the third groove extends in the axial direction of the sleeve member and penetrates through two ends of the sleeve member;

the third limiting piece comprises an annular piece arranged at the top end of the sleeve piece; the annular part is provided with a third hollow hole through which the sleeve part positioned above the annular part can penetrate; after the first protruding piece of the upper sleeve piece is embedded into the third groove of the lower sleeve piece, the annular piece is arranged at the top end of the lower sleeve piece, and the annular piece can abut against the first protruding piece to limit the first protruding piece to be separated from the third groove.

Preferably, the support table is further provided with at least one first hollow structure; the chassis is also provided with at least one second hollow structure.

Preferably, the bottom of the first bevel gear is further provided with a thrust bearing for reducing the friction of the bottom of the first bevel gear.

Preferably, the driving device comprises a motor vertically fixed on the chassis, one end of the motor is connected with the second bevel gear, and the other end of the motor can be electrically connected with an external power supply device.

The implementation of the utility model has the following beneficial effects: through the manhole door lifting device, workers do not need to lift the manhole door, and only the device is operated to adjust the relative position between the manhole door and the generator and disassemble and assemble the bolt, so that the working strength of the workers can be effectively reduced, the risk of injury by the workers is avoided, and the safety of the workers is ensured; the labor cost can be saved, and the whole working period is shortened.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic structural view of a manhole door lifting device for a nuclear power generator according to the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 in a front view;

FIG. 3 is a schematic view of the connection structure of the screw sleeve of the manhole door lifting device for a nuclear power generator according to the present invention;

FIG. 4 is a schematic view of the connection structure of the sleeve member of the manhole door lifting device for a nuclear power generator according to the present invention;

FIG. 5 is a sectional view of the magnetic base of the manhole door lifting device for a nuclear power generator according to the present invention;

FIG. 6 is a schematic view of the construction of any one of the sleeves of the manhole door lifting device for a nuclear power generator of the present invention;

FIG. 7 is a schematic structural view of a ring of the manhole door lifting device for a nuclear power generator of the present invention;

fig. 8 is a schematic structural view of a gear assembly of the manhole door lifting device for a nuclear power generator according to the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.

It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1, the manhole door lifting device for a nuclear power generator in the present invention may include a chassis 1, a telescopic device 2, a driving device 5, and a support platform 3; specifically, the chassis 1 is arranged at the bottom of the whole device and plays a role of supporting the whole device, and the bottom of the chassis 1 is generally contacted with the ground; optionally, the shape of the chassis 1 is circular, square or polygonal, in this embodiment, the chassis 1 is circular to obtain better stability; the telescopic device 2 is vertically arranged at the top of the chassis 1 and can do axial telescopic motion to extend the length of the telescopic device or contract the telescopic device to the minimum length; the driving device 5 can be used for providing power for the telescopic device 2 to do telescopic motion and is connected with the telescopic device 2; the support table 3 is used for abutting and supporting the manhole door, is fixedly connected to the top end of the telescopic device 2, and can move along the axial direction when the telescopic device 2 does axial telescopic motion; alternatively, the shape of the support table 3 is circular, square or polygonal, in this embodiment, the chassis 1 is square to obtain more contact area; preferably, two ends of the telescopic device 2 are respectively arranged on the bottom of the support platform 3 and the chassis 1 in the middle to obtain good bearing effect; the driving device 5 is arranged on the chassis 1 and at one side of the telescopic device 2 to make reasonable use of space.

As shown in fig. 3, the telescopic device 2 comprises a screw 22, a gear assembly 23 engaged with the bottom end of the screw 22, and a lifting sleeve assembly; specifically, the lifting sleeve component comprises a plurality of threaded sleeves 21, external threads are arranged on the side walls of the threaded sleeves 21, hollow holes axially penetrating the lifting sleeve component are further formed in the lifting sleeve component, and internal threads are arranged on the hole walls of the hollow holes; any two adjacent threaded sleeves 21 are spirally connected, the outer diameter of the threaded sleeve 21 below is smaller than the hole diameter of the hollow hole of the threaded sleeve 21 above, and the threaded sleeve 21 below can be contracted into the hollow hole of the threaded sleeve 21 above through the thread fit between the external thread on the threaded sleeve 21 below and the internal thread on the threaded sleeve 21 above, or extend outwards from the hollow hole until the threaded sleeve 21 above abuts against the first limiting piece; the first limiting member is disposed at the top end of the threaded sleeve 21 below the first limiting member, and can play a role in limiting the threaded sleeve 21 above the first limiting member from being separated from the threaded sleeve 21 below the first limiting member, and driving the threaded sleeve 21 above the first limiting member to rotate.

Specifically, the support table 3 is connected with a threaded sleeve 21 at the head end, and a screw 22 is inserted into the threaded sleeve 21 at the tail end and is in threaded connection with the threaded sleeve 21; the screw 22 is also provided with a second limiting piece which drives the threaded sleeve 21 at the tail end to rotate, and the second limiting piece can limit the threaded sleeve 21 at the tail end to be separated from the screw 22; the driving device 5 is connected with the gear assembly 23 to drive the gear assembly 23 to rotate, the gear assembly 23 drives the screw 22 to rotate, and the screw 22 drives the threaded sleeve 21 at the tail end to axially displace until the threaded sleeve 21 at the tail end abuts against the second limiting piece on the screw 22; since the second limiting member limits the axial displacement of the threaded sleeve 21 at the end, when the screw 22 continues to rotate, the threaded sleeve 21 at the end stops and follows the screw 22 to rotate, so as to drive the threaded sleeve 21 above the threaded sleeve 21 at the end to axially displace, and so on, until the whole threaded sleeve 21 extends to the maximum length, or the telescopic length of the threaded sleeve 21 is adjusted by the operator through controlling the driving device 5. The gear assembly 23 rotates to drive the screw 22 to rotate, and further drives the threaded sleeve 21 to perform axial telescopic motion along the screw 22.

Further, in some embodiments of the present invention, there are three threaded sleeves 21, namely, a first threaded sleeve 21a, a second threaded sleeve 21b, and a third threaded sleeve 21 c; the first threaded sleeve 21a, the second threaded sleeve 21b and the third threaded sleeve 21c are sequentially in threaded connection from top to bottom, and the outer diameters of the first threaded sleeve, the second threaded sleeve and the third threaded sleeve are sequentially arranged from large to small; the screw 22 can be sleeved in the hollow hole of the third threaded sleeve 21c, the third threaded sleeve 21c can be sleeved in the hollow hole of the second threaded sleeve 21b, and the second threaded sleeve 21b can be sleeved in the hollow hole of the first threaded sleeve 21 a; when the telescopic device 2 is contracted to the minimum length, the screw 22, the second threaded sleeve 21b and the third threaded sleeve 21c are all sleeved in the first threaded sleeve 21 a; when the telescopic device 2 starts to extend axially, the screw 22 rotates under the cooperation of the driving device 5 and the gear assembly 23, and the third threaded sleeve 21c is displaced upwards in the axial direction of the screw 22 under the rotation of the screw 22; at this time, the first threaded sleeve 21a and the second threaded sleeve 21b are sleeved outside the third threaded sleeve 21c and move along with the ascending movement; until the third threaded sleeve 21c abuts against the second limiting member located at the top end of the screw 22, because the second limiting member tightly clamps the third threaded sleeve 21c, the third threaded sleeve 21c stops displacing and rotates along with the screw 22, and further the second threaded sleeve 21b is driven to move upwards along the axial direction of the third threaded sleeve 21 c; at this time, the first threaded sleeve 21a is sleeved outside the second threaded sleeve 21b and moves along with the ascending; until the second threaded sleeve 21b abuts against the first limiting member located at the top end of the third threaded sleeve 21c, the second threaded sleeve 21b stops moving and rotates along with the third threaded sleeve 21c to drive the first threaded sleeve 21a to move upward along the axial direction of the second threaded sleeve 21b until the first threaded sleeve 21a abuts against the first limiting member located at the top end of the third threaded sleeve 21c, and at this time, the entire telescopic device 2 reaches the maximum extension length.

As shown in fig. 4, the lifting sleeve assembly may further include a plurality of sleeve members 24 sleeved outside the threaded sleeve 21, wherein in any two adjacent sleeve members 24, the sleeve member 24 above the sleeve member 24 can be retracted into the middle hole of the sleeve member 24 below the sleeve member; the upper sleeve member 24 is also provided with a third restricting member that restricts disengagement of the lower sleeve member 24. In particular, the sleeve element 24 serves to protect the parts in which it is arranged from external influences, such as the threaded sleeve 21; the sleeve member 24 has a smooth outer wall and is provided with a second hollow hole axially penetrating through the sleeve member; any two adjacent sleeve members 24 are connected in an inserting manner, and because the outer diameter of the sleeve member 24 above the sleeve member is smaller than the diameter of the second hollow hole of the sleeve member 24 below the sleeve member, the sleeve member 24 above the sleeve member can be contracted into the second hollow hole in the sleeve member 24 below the sleeve member or extend outwards along the second hollow hole until the sleeve member 24 above the sleeve member abuts against the third limiting member; the third limiting member is disposed at the top end of the sleeve member 24 below the third limiting member and serves to limit the sleeve member 24 above the third limiting member from being separated from the sleeve member 24 below the third limiting member.

The threaded sleeve 21 at the head end penetrates through the sleeve part 24 at the head end and is fixedly connected with the sleeve part so as to drive the sleeve part 24 to do axial telescopic motion when the threaded sleeve 21 does telescopic motion; the sleeve member 24 at the head end is fixedly connected with the support table 3, and the sleeve member 24 at the bottom end is fixedly connected with the chassis 1. Optionally, the connection can be fixed by screwing, welding, clamping, inserting or connecting pieces and the like; in the present embodiment, the upper portion of the threaded sleeve 21 at the head end is inserted into the sleeve member 24 at the head end, and is screwed to one end of the sleeve member 24 at the head end close to the chassis; the top of the sleeve part 24 of head end is equipped with the second connecting piece, and this second connecting piece can weld or the spiro union in the top of head end sleeve part 24, is equipped with the through-hole that a plurality of axial run through self on the second connecting piece, and accessible bolt passes the brace table 3 spiro union of through-hole and top to sleeve part 24 and brace table 3 fixed connection with the head end. Preferably, the second connecting member is a circular sheet-like member, the outer diameter of which matches the bore diameter of the second hollow bore of the head sleeve member 24; the bottom sleeve member 24 is welded to the chassis 1 at a central location.

Further, in some embodiments of the present invention, there are four sleeve members 24, a first sleeve member 24a, a second sleeve member 24b, a third sleeve member 24c, and a fourth sleeve member 24 d; the first sleeve piece 24a, the second sleeve piece 24b, the third sleeve piece 24c and the fourth sleeve piece 24d are sequentially connected in an inserting manner from top to bottom, and the outer diameters of the first sleeve piece, the second sleeve piece, the third sleeve piece and the fourth sleeve piece are sequentially arranged from small to large; the first sleeve piece 24a is fixedly connected with the support table 3, and the fourth sleeve piece 24d is fixedly connected with the chassis 1; when the telescopic device 2 is in the minimum length, the first sleeve piece 24a, the second sleeve piece 24b and the third sleeve piece 24c are all sleeved in the fourth sleeve piece 24 d; when the threaded sleeve 21 makes an extending movement, the first sleeve member 24a is axially moved upwards by the threaded sleeve 21; until it abuts against a third limiting member provided on the second sleeve member 24b, the first sleeve member 24a can drive the second sleeve member 24b to move up and down axially as the third limiting member limits the first sleeve member 24a from being released from the second sleeve member 24 b; and so on until the third sleeve member 24c abuts the third limiting member located on the top end of the fourth sleeve member 24d, at which time the telescopic device 2 reaches the maximum length of extension.

As shown in fig. 1, 2 and 5, the support platform 3 is further connected with at least one fixer for limiting the displacement of the manhole door, the fixer is arranged on the side edge of the support platform 3, and the side edge can make the support platform and the manhole door better contact with each other, so that the manhole door is prevented from falling off from the support platform. Specifically, the holder may include a magnetic base 41; the magnetic base 41 comprises a first magnet 411, a second magnet 413, a third magnet 412 and a rotating handle 415 which can control the second magnet 413 to rotate; the first magnet 411 is connected with the third magnet 412, and an accommodating space for accommodating the second magnet 413 is arranged between the first magnet 411 and the third magnet 412; the rotating handle 415 can rotate the two ends of the second magnet 413 to abut against the first magnet 411 and the third magnet 412, respectively, so that the magnetic base 41 can adsorb and fix the manhole.

Further, the first magnet 411 and the third magnet 412 may include soft magnetic magnets, and the second magnet 413 may include bar-shaped permanent magnets or permanent magnetic magnets; the first magnet 411 and the third magnet 412 are connected by a copper plate 414, and it is understood that the copper plate 414 is used to avoid the direct contact connection between the first magnet 411 and the third magnet 412 and plays a role of non-magnetic conductivity, and other materials are adopted to realize the above materials, which is not specifically limited herein; the first side walls of the first magnets 411 are spaced apart by copper plates 414, and are connected to the side walls of the third magnets 412 opposite to the first magnets 411; the middle part of the first side wall of the first magnet 411 is also provided with a first concave groove 4111 which is concave inwards, the side wall of the third magnet 412 opposite to the first magnet 411 is provided with a second concave groove 4121 which is matched with the first concave groove 4111, and an accommodating space for accommodating the second magnet 413 is formed after splicing; the rotating handle 415 is fixedly connected with the second magnet 413, and the second magnet 413 rotates along with the rotating handle 415; the handle 415 is rotated to make the N pole and S pole of the second magnet 413 contact the first magnet 411 and the third magnet 412 respectively, the first magnet 411 and the third magnet 412 can be magnetized, magnetic force lines are formed at the N pole, the first magnet 411, the adsorbate, the third magnet 412 and the S pole to be closed, and the top wall or the bottom wall of the first magnet 411 and the third magnet 412 can be used for adsorbing and fixing the manhole door; alternatively, when the N pole and the S pole of the second magnet 413 simultaneously contact the first magnet 411 and the third magnet 412, the magnetic force lines form a closed circuit in the first magnet 411 and the third magnet 412, respectively, and do not form a closed magnetic circuit with the adsorbate, and the magnetic base 41 does not have the function of adsorption and fixation. It will be appreciated that the adsorbate referred to above is the manhole door in the present invention. Preferably, the magnetic base 41 is a square structure, and has four magnetic bases, two of the magnetic bases are fixedly connected to two opposite sides of the supporting table and are symmetrically arranged, and the top of the magnetic base is flush with the upper surface of the supporting table, so as to obtain better adsorption fixing effect.

Optionally, the fixer may be fixedly connected to the bottom of the support platform 3 by means of screwing, welding, clamping, plugging, or connecting pieces; in the present embodiment, the bottom of the supporting platform 3 is provided with a first connecting piece 42 for fixing the magnetic base 41; the vertical part and the horizontal part of the first connecting piece 42 are in L-shaped structures; the horizontal part is fixedly connected with the bottom of the supporting table 3, and the vertical part is fixedly connected with the magnetic base 41. Optionally, the horizontal part and the bottom of the support table 3, the vertical part and the magnetic base 41 can be fixedly connected by means of screwing, welding, clamping, splicing or connecting pieces and the like; in the embodiment, the first bolt passes through a first opening hole arranged on the horizontal part and is locked at the bottom of the support platform 3; similarly, the vertical portion is also provided with a second opening, the second side wall of the magnetic base 41 is fixedly connected with the first screw 22, and the first screw 22 passes through the second opening and then is screwed with the nut to lock the magnetic base 41 on the vertical portion. Preferably, in order to achieve better adsorption effect, the horizontal part and the vertical part are of a sheet-like structure; the first opening and the second opening can be provided with a plurality of openings to enhance the fixing effect.

Alternatively, the first restriction member may include a first ratchet structure connected to a tip end thereof in an axial direction of the lower threaded sleeve 21; the second restriction member may include a second ratchet structure connected to a tip end thereof in the axial direction of the screw 22; when the bottom end of the shaft of the upper threaded sleeve 21 abuts against the first ratchet structure, the upper threaded sleeve 21 rotates along with the lower threaded sleeve 21; the bottom end of the distal threaded sleeve 21 abuts the second ratchet arrangement and the distal threaded sleeve 21 follows the rotation of the screw 22. Furthermore, the first ratchet structure may include a first ratchet tooth, and of any two adjacent threaded sleeves 21, the first ratchet tooth is disposed at the top end of the threaded sleeve 21 located below, and when the tail end of the external thread of the threaded sleeve 21 located above abuts against the first ratchet tooth, the axial displacement of the threaded sleeve 21 located above can be limited, and the first ratchet tooth can rotate along with the threaded sleeve 21 located below; the second ratchet structure may include second ratchet teeth, the second ratchet teeth are disposed at a top end of the screw rod 22, and when an external thread tail end of the threaded sleeve 21 located above the screw rod 22 abuts against the second ratchet teeth, the threaded sleeve 21 may be restricted from axial displacement and may rotate along with the screw rod 22.

As shown in fig. 6, the inner wall of the second hollow hole of the sleeve member 24 is provided with a first protruding member 241 protruding in the radial direction thereof, the outer wall of the sleeve member 24 is provided with a third groove 242 recessed in the radial direction thereof, and the third groove 242 extends in the axial direction of the sleeve member 24 and penetrates through both ends of the sleeve member 24; further, the first protrusion 241 is displaceable in the third groove 242 along the extending direction of the third groove 242; for any two adjacent sleeve members 24, the first protruding member 241 on the upper sleeve member 24 can be inserted into the third groove 242 on the lower sleeve member 24; when the telescopic device 2 is extended, the sleeve member 24 located above may extend outward along the extension direction of the third groove 242 on the sleeve member 24 located below.

As shown in fig. 7, the third restricting member includes a ring member 25 provided at the top end of the sleeve member 24; further, the ring member 25 is fixed to the top end of the sleeve member 24 by insertion; the annular member 25 further has a third hollow hole 251 through which the sleeve member 24 located above the annular member can pass; preferably, the outer diameter of the annular member 25 is the same as the outer diameter of the sleeve member 24; the third hollow bore 251 is slightly larger than the outer diameter of the sleeve member 24 thereabove; in any two adjacent sleeve members 24, after the first protruding member 241 of the upper sleeve member 24 is embedded in the third groove 242 of the lower sleeve member 24, the annular member 25 is mounted at the top end of the lower sleeve member 24, when the telescopic device 2 performs an extending motion, the upper sleeve member 24 can extend outwards along the extending direction of the third groove 242 on the lower sleeve member 24, the annular member 25 on the lower sleeve member 24 can abut against the first protruding member 241 of the upper sleeve member 24, so as to limit the first protruding member 241 from disengaging from the third groove 242, and the upper sleeve member 24 drives the lower sleeve member 24 to axially displace.

As shown in fig. 8, the gear assembly 23 includes a first bevel gear 231, and a second bevel gear 232 in meshed connection with the first bevel gear 231; the gear assembly 23 may be used to transfer motion and power between the interleaved shafts; the first bevel gear 231 is sleeved at the bottom end of the screw rod 22 and connected with the screw rod; the second bevel gear 232 is connected to the driving device 5, and the driving device 5 drives the second bevel gear 232 to rotate, and then transmits the rotation to the first bevel gear 231 to drive the screw 22 to rotate. It is to be understood that the first and second bevel gears 231 and 232 are provided to perform a transmission function, as long as the above-described function is achieved, and no specific number limitation or shape limitation is made herein.

Preferably, the bottom of the first bevel gear 231 is further provided with a thrust bearing for reducing the friction at the bottom of the first bevel gear 231; conventional thrust bearings can be adopted, and the functions can be realized, so that redundant description is omitted.

As shown in fig. 1, the supporting platform 3 is further provided with at least one first hollow structure 31; the chassis 1 is further provided with at least one second hollow structure 11. Specifically, first hollow structure 31 and second hollow structure 11 are used for lightening for whole manhole door elevating gear for nuclear power generator, and lightening is convenient for carry elevating gear on the basis of guaranteeing to support intensity. Alternatively, the first hollow structure 31 and the second hollow structure 11 may include a circle, a square, a trapezoid, a polygon, or an irregular shape, as long as the above-mentioned effects are satisfied, and this is not particularly limited. In this embodiment, the first hollow structures 31 are rectangular, and four first hollow structures 31 are disposed on the support platform 3 and arranged in two rows, one above the other, with the center of the support platform 3 as the center; the second hollow structures 11 are trapezoidal, six second hollow structures 11 are arranged on the chassis 1, and the second hollow structures are arranged at intervals around the center of the chassis 1 to form a circle.

Alternatively, the driving means 5 includes a motor vertically fixed on the chassis 1, and one end of the motor is connected to the second bevel gear 232, and the other end thereof may be electrically connected to an external power supply device.

Preferably, all of the above parts of the present invention are removable and reassembled and can be placed in an aluminum draw-bar box for easy carrying and shipping.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims (10)

1. A manhole door lifting device for a nuclear power generator is characterized by comprising a chassis (1) for supporting, a telescopic device (2) arranged on the chassis (1), a driving device (5) and a support table (3) for abutting against and supporting a manhole door; the supporting table (3) is fixedly connected to the top end of the telescopic device (2) and can move along the axial direction when the telescopic device (2) does axial telescopic motion;

the telescopic device (2) comprises a screw rod (22), a gear assembly (23) connected with the bottom end of the screw rod (22) in a meshed mode, and a lifting sleeve assembly; the lifting sleeve component comprises a plurality of threaded sleeves (21), any two adjacent threaded sleeves (21) are in threaded connection, the threaded sleeve (21) below the lifting sleeve component can stretch out and draw back in a hollow hole of the threaded sleeve (21) above the threaded sleeve, and a first limiting part for driving the threaded sleeve (21) above the lifting sleeve component to rotate is arranged at the top end of the threaded sleeve (21) below the lifting sleeve component; the support table (3) is connected with a threaded sleeve (21) positioned at the head end, and the screw rod (22) penetrates through the threaded sleeve (21) at the tail end and is in threaded connection with the threaded sleeve; the screw rod (22) is also provided with a second limiting piece which drives the threaded sleeve (21) at the tail end to rotate; the driving device (5) is connected with the gear assembly (23) to drive the gear assembly (23) to rotate, and the gear assembly (23) drives the screw rod (22) to rotate so as to drive the threaded sleeve (21) to do axial telescopic motion along the screw rod (22);

the support platform (3) is also connected with at least one fixer for limiting the displacement of the manhole door.

2. The manhole door lifting device for nuclear power generators as claimed in claim 1, wherein the lifting sleeve assembly further comprises a plurality of sleeve members (24) sleeved outside the threaded sleeve (21), and of any two adjacent sleeve members (24), the sleeve member (24) above the sleeve member can extend and contract in the middle hole of the sleeve member (24) below the sleeve member; the upper sleeve part (24) is also provided with a third limiting part for limiting the separation of the lower sleeve part (24);

the threaded sleeve (21) at the head end penetrates through the sleeve part (24) at the head end and is fixedly connected with the sleeve part, so that the sleeve part (24) is driven to do axial telescopic motion when the threaded sleeve (21) does telescopic motion; the sleeve part (24) at the head end is fixedly connected with the supporting table (3), and the sleeve part (24) at the bottom end is fixedly connected with the chassis (1).

3. Manhole door lifting device for nuclear power generators according to claim 1, wherein said gear assembly (23) comprises a first bevel gear (231), and a second bevel gear (232) in meshed connection with said first bevel gear (231); the first bevel gear (231) is sleeved at the bottom end of the screw rod (22) and is connected with the screw rod; the second bevel gear (232) is connected with the driving device (5), and the driving device (5) drives the second bevel gear (232) to rotate so as to transmit the rotation to the first bevel gear (231) to drive the screw rod (22) to rotate.

4. Manhole door lifting device for nuclear power generators, according to claim 1, wherein the holder comprises a magnetic seat (41); the magnetic base (41) comprises a first magnet (411), a second magnet (413), a third magnet (412) and a rotating handle (415) capable of controlling the second magnet (413) to rotate; the first magnet (411) is connected with the third magnet (412) through a copper plate (414), and an accommodating space for accommodating the second magnet (413) is further arranged between the first magnet and the third magnet; the rotating handle (415) can rotate the second magnet (413) to enable two ends of the second magnet to abut against the first magnet (411) and the third magnet (412) respectively.

5. The manhole door lifting device for nuclear power generators of claim 4, wherein the bottom of the support table (3) is further provided with a first connecting piece (42) for fixing the magnetic base (41); the vertical part and the horizontal part of the first connecting piece (42) are of L-shaped structures; the horizontal part is fixedly connected with the bottom of the supporting table (3), and the vertical part is fixedly connected with the magnetic seat (41).

6. Manhole door lifting device for nuclear power generators, according to claim 1, wherein the first limiting member comprises a first ratchet structure connected to its top end along the axial direction of the lower threaded sleeve (21); the second limiting member comprises a second ratchet structure which is connected to the top end of the screw rod (22) along the axial direction of the screw rod;

the bottom end of the upper threaded sleeve (21) shaft is abutted against a first ratchet structure, and the upper threaded sleeve (21) rotates along with the lower threaded sleeve (21);

the bottom end of the tail end threaded sleeve (21) abuts against the second ratchet structure, and the tail end threaded sleeve (21) rotates along with the screw rod (22).

7. The manhole door lifting device for nuclear power generators of claim 2, wherein the inner wall of the second hollow hole of the sleeve member (24) is provided with a first protruding member (241) protruding in the radial direction of the sleeve member, the outer wall of the sleeve member (24) is provided with a third groove (242) recessed in the radial direction of the sleeve member, and the third groove (242) extends in the axial direction of the sleeve member (24) and penetrates through both ends of the sleeve member (24);

the third limiting member comprises an annular member (25) provided at a top end of the sleeve member (24); the annular part (25) is provided with a third hollow hole (251) through which the sleeve part (24) above the annular part can penetrate; after the first protruding part (241) of the upper sleeve part (24) is embedded into the third groove (242) of the lower sleeve part (24), the annular part (25) is arranged at the top end of the lower sleeve part (24), and the annular part (25) can abut against the first protruding part (241) to limit the first protruding part (241) to be separated from the third groove (242).

8. The manhole door lifting device for nuclear power generators of claim 1, wherein the support table (3) is further provided with at least one first hollowed structure (31); the chassis (1) is also provided with at least one second hollow structure (11).

9. The manhole door lifting device for nuclear power generators of claim 3, wherein the bottom of the first bevel gear (231) is further provided with a thrust bearing for reducing friction at the bottom of the first bevel gear (231).

10. Manhole door lifting device for nuclear power generators according to claim 3, wherein said driving means (5) comprise an electric motor vertically fixed on said chassis (1), one end of said electric motor being connected to said second bevel gear (232), the other end of said electric motor being electrically connectable to external power supply means.

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