CN112591603A

CN112591603A - Domestic ring-hanging open type gear replacing method for in-service unit

Info

Publication number: CN112591603A
Application number: CN202011440149.3A
Authority: CN
Inventors: 王武军; 王家鹏; 刘永杰; 鞠治军; 刘琨; 赵增超; 彭锦涛; 汤英豪; 曹旭丹
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-04-02
Anticipated expiration: 2040-12-10
Also published as: CN112591603B

Abstract

The invention relates to a method for replacing a domestic ring-hanging open gear of an in-service unit, which comprises the following steps: s1, removing the old open gear from the set position on the crane: s2, sleeving the old open gear on the first convex part of the mould, sleeving the prefabricated part on the second convex part of the mould, and prefabricating a new open gear from the prefabricated part according to the characteristic parameters of the old open gear; s3, installing the new open gear to the set position on the crane; and S4, grinding the new open gear. The method for replacing the domestic ring-hung open gear of the in-service unit can effectively replace the open gear, improve the reliability of the domestic ring-hung of the in-service unit, improve the overhauling quality, reduce the process steps, shorten the operation time, reduce the safety risks of personal injury, foreign matter falling and the like, and ensure that the hoisting of major parts is smoothly carried out during the overhaul period.

Description

Domestic ring-hanging open type gear replacing method for in-service unit

Technical Field

The invention relates to the field of nuclear power, in particular to a method for replacing a domestic ring-hung open gear of an in-service unit.

Background

The ring crane is used as a hoisting crane for heavy equipment such as a reactor top cover, an upper member, a lower member, an evaporator and the like during the overhaul of the nuclear island, the open gear is a main transmission gear of the ring crane, and the replacement process can improve the safety and reliability of the domestic ring crane of the nuclear power in-service unit. The domestic ring-hung open gear of the unit in service is manufactured by materials, manufacturing processes and the like, and meanwhile, foreign matters enter the open gear due to the fact that the unit runs in the engineering installation and debugging period and the environment is severe, so that the open gear is abnormally abraded, and if the open gear is not replaced, great potential safety hazards exist.

Disclosure of Invention

The invention aims to solve the technical problem of providing an improved replacement method of a domestic ring-hanging open gear of an in-service unit.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for replacing a domestic ring-hung open gear of an in-service unit is constructed, and comprises the following steps:

s1, removing the old open gear from the set position on the crane:

s2, sleeving the old open gear on the first convex part of the mould, sleeving the prefabricated part on the second convex part of the mould, and prefabricating a new open gear from the prefabricated part according to the characteristic parameters of the old open gear;

s3, installing the new open gear to the set position on the crane;

and S4, grinding the new open gear.

Preferably, the old open gear comprises an old open bull gear;

the step S1 includes the steps of:

s1.1, hoisting a winding drum of the crane to a set height through a rigging;

s1.2, hoisting the old open large gear installed on the winding drum;

s1.3, separating the old open large gear from the winding drum.

Preferably, the old open gear further comprises an old open pinion;

the step S1 further includes the steps of:

s1.4, removing an old open pinion matched with the old open bull gear on the crane.

Preferably, in the step S2, the characteristic parameters of the old open gear include the shape, size, number of openings, diameter of the holes, and/or distance between the holes of the old open gear.

Preferably, the step S2 includes the steps of:

s2.1, sleeving the old open type large gear on a first convex part of a mould, sleeving the prefabricated part on a second convex part of the mould, and setting front and back marks at corresponding positions of the prefabricated part according to the front and back marks of the old open type large gear;

s2.2, adjusting the parallelism of the old open large gear and the prefabricated part;

and S2.3, processing the inner diameter and the outer diameter of the prefabricated part according to the inner diameter and the outer diameter of the old open large gear.

Preferably, the step S2 further includes the steps of:

s2.4, a drill is used for forming a hole matched with the winding drum on the prefabricated part along the hole matched with the winding drum on the old open gear;

s2.5, taking out the prefabricated part from the second convex part of the mould to form a new open type large gear.

Preferably, the new open gear comprises a new open bull gear and a new open pinion gear;

the step S4 includes the steps of: and meshing the newly opened large gear with the newly opened small gear, and rotating the newly opened small gear to grind the gear.

Preferably, the step S4 further includes measuring the interdental space of the newly opened bull gear by lead pressing.

Preferably, the step S4 further includes scattering marking powder on any tooth of the new-open pinion gear, and measuring the contact area between the new-open pinion gear and the new-open bull gear according to the stunning area of the powder on the new-open bull gear by rotating the new-open pinion gear.

Preferably, the new open gear comprises a new open bull gear;

the step S3 includes the steps of:

s3.1, lifting a main lifting drum of the crane to a set height through a rigging;

s3.2, hoisting the newly opened large gear to the set height;

and S3.3, connecting and fixing the newly opened large gear and the winding drum.

The method for replacing the domestic ring-hung open gear of the in-service unit has the following beneficial effects: the method for replacing the domestic ring-hung open gear of the in-service unit can effectively replace the open gear, improve the reliability of the domestic ring-hung of the in-service unit, improve the overhauling quality, reduce the process steps, shorten the operation time, reduce the safety risks of personal injury, foreign matter falling and the like, and ensure that the hoisting of major parts is smoothly carried out during the overhaul period.

Drawings

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

FIG. 1 is a process flow diagram of a method for replacing a domestic ring-suspended open gear of an in-service unit according to some embodiments of the present invention;

FIG. 2 is a schematic structural diagram of a clamping fixture used in the replacement method of a domestic ring-suspended open gear of the in-service unit shown in FIG. 1;

FIG. 3 is a schematic diagram illustrating a state that a new open gear is prefabricated by using a mold in the replacement method of the domestic ring-hung open gear of the in-service unit shown in FIG. 1;

fig. 4 is a schematic diagram of a state of drilling a prefabricated new open gear in the replacement method of the domestic ring-hung open gear of the in-service unit shown in fig. 1.

Detailed Description

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

Fig. 1 to 4 show some preferred embodiments of the replacement method of the domestic ring-hung open gear of the in-service unit. The method for replacing the domestic ring-hung open gear of the in-service unit can effectively replace the open gear, improve the reliability of the domestic ring-hung of the in-service unit, improve the overhauling quality, reduce the process steps, shorten the operation time, reduce the safety risks of personal injury, foreign matter falling and the like, and ensure that the hoisting of major parts is smoothly carried out during the overhaul period. The transmission process of the main lifting hook of the ring crane is as follows: the motor transmits power to the reduction gearbox, the reduction gearbox drives the pinion to rotate after speed change, the open large gear is linked with the open small gear, the open large gear is rigidly connected with the winding drum 40, the winding drum 40 rotates, and finally the power is transmitted to the lifting hook through the steel wire rope wound on the winding drum, so that the hoisting of the heavy equipment is realized.

The method for replacing the domestic ring-hung open gear of the in-service unit comprises the following steps:

and S1, removing the old open gear from the set position on the crane.

Wherein the old open gears can be an old open bull gear 10 and an old open pinion gear.

The step S1 may include the steps of: s1.1, hoisting a winding drum 40 of a crane to a set height through a rigging; the rigging may be a sling and in some embodiments the arch may be overhauled using a loop crane, using 2 slings of 10T to lift a primary lifting drum 40 of 11T weight 600 mm. In the step, the steel wire rope anti-lap drum cushion block can be placed on one side of the winding drum 40, so that a sufficient gap is reserved between the winding drum 40 and the steel wire rope, and the winding drum 40 is free from being blocked when ascending, so that the operation steps of dismounting the drum can be reduced, the operation time is shortened, and the operation risk is reduced. The brake disc of reel 40 other end has three safety brake, rises to rise reel 40 and need open safety brake is manual, in order to prevent the mistake combined floodgate, need with C type clamp pad to the manual release nut department of safety brake. When the winding drum 40 rises, 3 turns of the steel wire rope wound on the winding drum 40 are reserved, the rest of the steel wire rope is wound on the air, and when the winding drum 40 rises upwards, in order to prevent the steel wire rope from driving the winding drum 40 to rotate, a steel wire rope clamp is used for fixing one section of the steel wire rope on the trolley.

S1.2, hoisting an old open large gear 10 arranged on a winding drum 40; in some embodiments, a 6.3T service winch may be used to hoist the old bull gear.

S1.3, separating the old open large gear 10 from the winding drum 40; in some embodiments, the old open bull gear 10 and the winding drum 40 can be positioned by 12 steel coil pins, and the 12 bolts are fixed, when disassembling, the bolts are firstly disassembled, a special punch is used for punching the steel coil pin in each hole to separate the old open bull gear 10 from the winding drum 40, and then the winch is started to lower the old open bull gear 10 to the plane.

In some embodiments, this step S1 may further include the steps of:

s1.4, removing an old open pinion matched with an old open bull gear 10 on the crane, wherein the old open pinion is installed in a reduction gearbox, one end of the reduction gearbox is fixed with a base of the crane through a torque support, shafts extending out of two sides of the reduction gearbox are respectively connected with two electromagnetic brakes, a shaft close to a motor side is connected with a motor output shaft through a rigid coupling, the other end of the reduction gearbox is nested on the shaft of the old open pinion, and the old open pinion can be rotatably installed on the base of the crane. Specifically, when the old open pinion is dismounted, the whole reduction gearbox is firstly dismounted, then the coupler on the reduction gearbox is dismounted, then 8 bolts connected with the crane on the old open pinion are dismounted, and finally the shaft of the old open pinion is pulled out. If the moment support pin shaft of the reduction gearbox is not easy to disassemble, a special knocking steel bar can be used for knocking out the pin shaft.

S2, sleeving the old open gear on the first convex part 32 of the clamping fixture 30, sleeving the prefabricated part on the second convex part 33 of the clamping fixture 30, and prefabricating the prefabricated part into a new open gear according to the characteristic parameters of the old open gear.

The characteristic parameters of the old open gear comprise the shape, the size, the number of open holes, the aperture and/or the hole spacing of the old open gear. Specifically, for the old open large gear 10, the characteristic parameters thereof may include the shape of the old open large gear 10, the inner diameter of the central through hole, the outer diameter of the old open large gear 10, the number of holes on the end surface of the old open large gear 10, the aperture of the holes, and the distance between two holes adjacently disposed. For the old open pinion, the characteristic parameters may include the shape of the old open pinion, the inner diameter of the central through hole, and the outer diameter of the old open pinion. As shown in fig. 2, the mold 30 may include a main body 31, a first protrusion 32 disposed at one end of the main body 31, and a second protrusion 33 disposed at the other end of the main body 31. The main body 31 may be cylindrical, the first protrusion 32 and the second protrusion 33 may be cylindrical, the radial dimension of the first protrusion 32 and the second protrusion 33 may be smaller than the radial dimension of the main body 31, and the radial dimension of the first protrusion 32 and the second protrusion 33 is equivalent.

Specifically, the step S2 includes the steps of:

s2.1, sleeving the old open type large gear 10 on a first convex part 32 of the mould 30, sleeving the prefabricated part on a second convex part 33 of the mould 30, and setting front and back marks at corresponding positions of the prefabricated part according to the front and back marks of the old open type large gear 10. The upper end face of the old open bull gear 10 is provided with a front mark, and the lower end face of the old open bull gear 10 is provided with a back mark. Specifically, as shown in fig. 3, a mold 30 having an outer diameter of a first protrusion 32 corresponding to an inner diameter of an old open large gear 10 is selected, and then the old open large gear 10 is sleeved on the first protrusion 32 along an axial direction of the first protrusion 32 and connected to an end surface of one end of the main body 31, and a hole is formed in the center of the preform, wherein the size of the hole of the center through hole is matched with the size of the center through hole of the old open large gear 10. Then, the preform is sleeved on the second protrusion 33 from the other direction along the axial direction and connected to the end face of the other end of the main body 31, the front mark is disposed on the upper end face of the preform, and the back mark is disposed on the lower end face of the preform. By sleeving the old open bull gear 10 and the prefabricated member on the first convex part 32 and the second convex part 33 of the clamping fixture 30, the concentricity of the holes on the old gear and the new gear matched with the winding drum 40 can be ensured to meet the requirement.

S2.2, adjusting the parallelism of the old open large gear 10 and the prefabricated part. In some embodiments, the parallelism of the old open gearwheel 10 and the preform can be ensured to be <0.05 by rotating the old open gearwheel 10 and the preform such that the end face of the old open gearwheel 10 is parallel to the end face of the preform, and measuring the parallelism of the old open gearwheel 10 and the preform.

And S2.3, processing the inner diameter and the outer diameter of the prefabricated part according to the inner diameter and the outer diameter of the old open large gear 10. The inner diameter and the outer diameter of the central through hole of the prefabricated member are processed by adopting a conventional gear processing method, so that the inner diameter and the outer diameter of the prefabricated member are respectively equivalent to the inner diameter and the outer diameter of the old open large gear 10. In some embodiments, the preform may have an inner diameter of 34mm and an outer diameter of 38 mm.

In some embodiments, this step S2 may further include the steps of:

and S2.4, using a drill to open corresponding holes matched with the winding drum 40 on the prefabricated part along the holes matched with the winding drum 40 on the old open gear. Specifically, as shown in fig. 3, along the hole on the face of the old open gear, a first drill bit is used for first drilling, and then a second drill bit is used for second drilling, wherein the radial dimension of the second drill bit is larger than that of the first drill bit. According to the step, 12 holes are drilled in sequence, in some embodiments, three points are taken for each hole of the newly opened bull gear 20 to measure the aperture X, and the aperture X of each hole of the newly opened bull gear 20 is phi 38+ 0.10. Wherein, the drill bit can be a magnetic drill.

And S2.5, taking out the prefabricated member from the second convex part 33 of the clamping fixture 30 to form a new open type large gear 20.

As shown in fig. 4, in some embodiments, the step S2 may further include drilling the new-opened bull gear 20 and the reel 40 to ensure that the hole of the new-opened bull gear 20 matching with the reel 40 has a hole diameter consistent with the hole diameter of the through hole 41 of the reel 40. Specifically, the new bull gear 20 may be aligned with the spool 40 such that each hole that mates with the spool 40 is located with a hole on the end face of the spool 40, and then a third drill 50 may be used to drill down the hole in the new bull gear 20 that mates with the spool 40 such that the hole diameter increases to 40+ 0.10.

In some embodiments, the pinion may be prepared according to steps S2.1-S2.3.

And S3, mounting the new open gear to a set position on the crane.

Specifically, the step S3 includes the steps of:

and S3.1, lifting the main lifting drum 40 of the crane to a set height through a rigging. The arch can be overhauled using a loop crane, using 2 slings of 10T to lift a main lifting drum 40 of 11T weight 600 mm.

And S3.2, hoisting the newly opened big gear 20 to a set height. The new bull gear 20 is hoisted flush with the drum 40 using a 6.3T service hoist.

And S3.3, connecting and fixing the newly opened large gear 20 with the winding drum 40. The positions of the newly opened bull gear 20 and the winding drum 40 are adjusted, so that the hole on the newly opened bull gear 20, which is matched with the winding drum 40, is aligned with the through hole 41 on the end face of the winding drum 40, and the hole on the newly opened bull gear 20, which is matched with the winding drum 40, and the through hole 41 correspondingly arranged on the winding drum 40 are penetrated by bolts, so that the newly opened bull gear 20 is tightly connected with the winding drum 40.

And S4, grinding the new open gear.

In some embodiments, the bull gear 20 can be engaged with a pinion gear, and the pinion gear can be rotated to grind teeth, during which the gap between teeth of the bull gear 20 can be measured using a lead-pressing method. Specifically, the newly opened large gear 20 is equally divided into 8 points on the circumference, each point is provided with three lead wires on the left, the middle and the right of the newly opened small gear, and then the newly opened small gear is rotated to measure the thickness of the lead wires, thereby measuring the gap between teeth. In other embodiments, the marking powder can be scattered on any tooth of the new-opened pinion, and the contact area between the new-opened pinion and the new-opened bull gear 20 can be measured according to the blooming area of the powder on the new-opened pinion by rotating the new-opened pinion. The marking powder can be red lead powder, and the meshing requirements of the newly opened big gear 20 and the newly opened small gear are that the width direction is more than 50 percent, the length direction is more than 65 percent, and the ruler side clearance is 0.5-1.0 mm.

In some embodiments, the method for replacing the domestic ring-hung open gear of the in-service unit may further include re-assembling a new pinion, specifically, assembling the new pinion to the base, inserting the speed reducer back into the new pinion shaft, welding and fixing a torque support at the other end of the speed reducer, centering the motor shaft and the reduction gearbox, adjusting the concentricity and the parallelism of the motor shaft and the reduction gearbox during centering, specifically, re-assembling a torque connecting block to the reduction gearbox, unloading the chain block to enable the load of the reduction gearbox to be borne by the torque supporting block, and adjusting by adjusting a base gasket or polishing a welding port of the torque connecting block. Ensuring the gap between two sides of the coupler to be 5-8 mm; detecting the coaxiality of the coupler to be less than or equal to 0.15 mm; and (3) detecting the end face runout of the brake disc to be less than or equal to 0.15mm, fastening a ground angle bolt of the motor after the brake disc is qualified to be detected, and finally starting the ring crane to perform a load test on the crane.

The method for replacing the ring-hung open gear of the in-service unit can shorten the construction period, shorten the construction period from the original 30 days to 6 days, save the construction period of 1 day, improve the maintenance quality, reduce the process steps, shorten the operation time, and reduce the safety risks of personnel injury, foreign matter falling and the like. The replacement method of the domestic ring-hanging open gear of the in-service unit improves the safety and reliability of ring-hanging equipment and provides reliable guarantee for hoisting of major equipment of a nuclear island during overhaul of each power station unit.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; 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

1. A method for replacing a domestic ring-hung open gear of an in-service unit is characterized by comprising the following steps:

s1, removing the old open gear from the set position on the crane:

s3, installing the new open gear to the set position on the crane;

and S4, grinding the new open gear.

2. The replacement method for domestic eye-drop open gears of in-service units according to claim 1, wherein the old open gear comprises an old open bull gear;

the step S1 includes the steps of:

s1.1, hoisting a winding drum of the crane to a set height through a rigging;

s1.2, hoisting the old open large gear installed on the winding drum;

s1.3, separating the old open large gear from the winding drum.

3. The replacement method for domestic eye ring-hanging open gears of in-service units according to claim 2, wherein the old open gear further comprises an old open pinion;

the step S1 further includes the steps of:

4. The replacement method of the in-service unit domestic ring-hung open gear according to claim 1, wherein in the step S2, the characteristic parameters of the old open gear comprise the shape, size, number of holes, aperture and/or hole spacing of the old open gear.

5. The replacement method for the domestic eye-drop open gear of the in-service unit according to claim 2, wherein the step S2 comprises the following steps:

6. The replacement method for the domestic eye-drop open gear of the in-service unit according to claim 5, wherein the step S2 further comprises the following steps:

7. The replacement method for the domestic ring-hung open gear of the in-service unit according to claim 1, wherein the new open gear comprises a new open large gear and a new open small gear;

the step 4 comprises the following steps: and meshing the newly opened large gear with the newly opened small gear, and rotating the newly opened small gear to grind the gear.

8. The replacement method of the domestic ring-hung open gear of the in-service unit according to claim 7, wherein the step S4 further comprises measuring the gap between teeth of the new open bull gear by lead pressing.

9. The replacement method of the in-service unit domestic ring-hung open gear according to claim 7, wherein the step S4 further comprises scattering marking powder on any tooth of the new-open pinion gear, and measuring the contact area between the new-open pinion gear and the new-open bull gear according to the blooming area of the powder on the new-open bull gear by rotating the new-open pinion gear.

10. The replacement method for the domestic ring-hanging open gear of the in-service unit according to claim 1, wherein the new open gear comprises a new open bull gear;

the step S3 includes the steps of:

s3.2, hoisting the newly opened large gear to the set height;