CN107591965B - Core penetrating method for hydraulic motor with short limit shaft - Google Patents

Abstract

A core penetrating method for a hydraulic motor with a limited short shaft comprises the following steps: short shaft installation preparation: after a buffer isolation plate is stuffed between a motor stator and a rotor, the motor stator and the rotor are integrally hoisted to a core-pulling site; then, a short shaft is connected to one end of the coupler; selecting a limit point in the core pulling field, wherein the limit point is a reference of the placement position of the stator, the short shaft of the rotor is close to the wall but cannot be pressed against the wall, and the distance from the limit point to the other wall is larger than the sum of the length of the stator, the length of the rotor and the length of the short shaft; the integral hoisting moves the motor to the position of the limit point; and adopting a three-stage core-pulling method, hoisting by using a hydraulic gantry crane and moving towards a direction opposite to a limit point, wherein one hoisting rope takes a position close to a rotor coupling as a hoisting point, a certain point on the short shaft as the hoisting point and a position close to a rotor magnetic pole as the hoisting point, continuously relaying and translating the rotor, and enabling the rotor to be communicated with the short shaft and move outside the stator together, thereby completing the core-pulling.

Description

Core penetrating method for hydraulic motor with short limit shaft

Technical Field

The invention belongs to the technical field of large motor maintenance, and particularly relates to a core penetrating method for a hydraulic motor with a short limit shaft.

Background

In the process of dismantling the large-scale main transmission motor, the method for drawing (penetrating) the core of the main motor is the most critical step, the difficulty is the greatest, and the time and the labor are consumed. The existing main motor core pulling (penetrating) methods of the rolling mill are many, but the method is basically not suitable for rough rolling motors of a hot rolling production line. The reason is that the rough rolling motor room is usually arranged in a usable field without a large crane, with a narrow space and a motor core pulling (threading), and the like. At present, for the motors, the common core drawing (penetrating) construction mode mostly adopts the construction technology of repeatedly shifting the stator and the rotor at small distances so as to ensure that the construction is carried out under the condition that the core drawing (penetrating) field is limited. The technology has the safety risks that the stator or the rotor needs to be displaced for many times and is difficult to dynamically fix, the construction efficiency is slow, and the construction difficulty is high.

To sum up, can't satisfy the core hoist and mount requirement to the factory building driving, the small and motor of factory building space is taken out (is worn) the core operation of taking out of the motor that the available position of core lacked, prior art has a great deal of not enough yet.

Disclosure of Invention

The invention aims to provide a core penetrating method for a hydraulic motor with a short limit shaft, which mainly aims at the technical problems and adopts the steps of determining a core drawing (penetrating) limit point and increasing the short shaft for construction on the basis of carefully researching the positions of a plurality of rough rolling motor chambers and the core drawing (penetrating) positions of the motor, so that the construction efficiency is high and the safety is high.

In order to achieve the purpose, the invention adopts the following technical scheme:

a core penetrating method for a hydraulic motor with a limited short shaft comprises the following steps:

short shaft installation preparation: a buffer isolation plate is plugged into an inner hole of a stator of the motor, so that the buffer isolation plate is arranged between the stator and a rotor, and the rotor is prevented from being directly contacted with the hole wall of the inner hole of the stator; sleeving two hoisting ropes on two hoisting points of the rotor rotating shaft respectively, wherein one hoisting point is close to a motor collecting ring, and the other hoisting point is close to the coupling side of the rotor and is called as a coupling side hoisting point; integrally hoisting the rotor and the stator to a core-pulling field by using a hydraulic gantry crane; the hydraulic gantry crane comprises a first hoisting beam and a second hoisting beam, the first hoisting beam and the second hoisting beam are respectively supported by a pair of walking bases, and the walking bases walk on a pair of walking rails preset on the ground;

short shaft installation: in the core-pulling place, a short shaft is connected with a coupler of the rotor rotating shaft;

selecting a limit point: selecting a point in a core pulling field as a limit point for placing a stator of the motor, wherein the limit point divides the core pulling field into a long section and a short section, the short section is slightly larger than the sum of the length of a rotating shaft part and the length of a short shaft on the side of a rotor coupler, and the long section is required to be larger than the sum of the length of the stator, the length of the rotor and the length of the short shaft; therefore, after the stator is placed at the limit point, the short shaft is close to but does not exceed the wall of the core pulling field, the residual space of the core pulling field is enough to provide the operation of the core pulling step, and meanwhile, the walking base is ensured not to be separated from the walking track;

integrally hoisting and moving to a limit point: the motor connected with the short shaft is integrally hoisted to the position above the limit point by using a hydraulic gantry crane, then the hydraulic gantry crane falls back to place the motor stator at the position of the limit point, and one side of the motor stator is aligned with the limit point;

core pulling: the method comprises a first-stage core pulling, a second-stage core pulling and a third-stage core pulling; wherein:

first-stage core pulling: removing the buffer isolation plate, and adjusting the hydraulic gantry crane to enable a gap to be reserved between the periphery of the rotor and the inner hole wall of the stator; the hydraulic gantry crane lifts the rotor to move for a distance in the direction opposite to the short shaft until the side lifting point of the coupler is close to the stator, and stops moving, and a first support body is adopted to support the lower side of one end, provided with the coupler, of the rotor rotating shaft;

secondary core pulling: moving the suspension point on the side of the coupler to the short shaft to enable a certain position on the short shaft to form a new suspension point; the hydraulic gantry crane lifts the rotor to move for a distance in the direction opposite to the short shaft until the upper lifting point of the short shaft is close to one side of the stator, namely, the rotor stops moving, and a second support body is adopted to support the lower side of the short shaft;

and (3) third-stage core pulling: moving the suspension point on the short shaft to a position of the rotor rotating shaft close to the magnetic pole, wherein a certain position of the rotor rotating shaft close to the magnetic pole forms a new suspension point; and hoisting the rotor by the hydraulic gantry crane to move for a distance in the direction opposite to the short shaft until the rotor and the short shaft are moved out of the stator, and finishing the core pulling operation by the motor.

According to a possible embodiment of the present invention, the method further includes a core penetrating step, where the core penetrating step is a reverse step of the core pulling step, and includes a first-stage core penetrating step, a second-stage core penetrating step, and a third-stage core penetrating step:

in the first stage of core penetration, hoisting points are respectively arranged at two ends of the rotor rotating shaft, one hoisting point is close to the side of the collecting ring, and the other hoisting point is close to the rotor magnetic pole; the hydraulic gantry crane lifts the rotor to move for a certain distance in the direction of the short shaft until a lifting point close to the magnetic pole of the rotor is close to one side of the stator, and then stops moving, at the moment, the short shaft penetrates into the stator and then penetrates out of the other side of the stator, and a support body is adopted to support the lower side of the short shaft;

second-stage core penetration: moving a suspension point from a position near the rotor pole onto the stub shaft; the hydraulic gantry crane lifts the rotor to move for a certain distance in the direction of the short shaft until the lifting rope corresponding to the short shaft cannot move continuously in the direction of the short shaft due to the limitation of the moving range of the traveling base, and the hydraulic gantry crane stops, and is supported on the lower side of the short shaft by a support body;

third-stage core penetration: moving the hoisting point from the short shaft to the stator direction to a position where the rotating shaft is close to the coupler; and hoisting the rotor by the hydraulic gantry crane to move a certain distance in the direction of the short shaft until all the magnetic poles of the rotor enter the stator, and detaching the short shaft to finish the core penetrating operation of the motor.

According to a possible embodiment of the invention, the limit point is selected so as to satisfy 3 conditions: firstly, the method comprises the following steps: when the motor stator is placed in alignment with the limit point, the distance between the side lifting point of the coupler and the tail end of the traveling track is not less than 1/2 traveling base width, so that the hydraulic gantry crane can normally travel and work; secondly, the method comprises the following steps: after the short shaft is connected with the coupler, the tail end of the short shaft is close to but cannot abut against the wall of the factory building; thirdly, the method comprises the following steps: the floor strength of the limit point position has enough supporting strength, the requirement of the motor for drawing the core can be met, and the danger of inclination of the stator of the motor due to ground collapse is prevented.

Under the general condition, the width of the traveling base is 3m, and in order to ensure the normal lifting and displacement of the hydraulic gantry crane, the distance from a lifting point on the side of the coupler to the tail end of the traveling track is more than or equal to 1.5 m. In general, the supporting strength required by the motor drawing-through core is satisfied, and the supporting strength at the position can bear the weight of the whole motor.

According to a possible embodiment of the present invention, in the step of preparing for installation of the stub shaft, the buffer isolation plate is a rubber plate with a thickness of 2-5mm, and more preferably a rubber plate with a thickness of 3 mm.

According to a feasible embodiment of the invention, in the step of integrally hoisting and moving the whole body to the limit point, a base plate is pre-laid at the position of the limit point, and the base plate ensures that the stator of the motor is stably placed and prevents the stator from being damaged.

According to a feasible embodiment of the invention, in the first-stage core pulling step and the second-stage core pulling step, the hoisting rope is close to the stator, specifically, the distance from the hoisting rope to one side edge of the stator is close to 100 mm.

According to a possible embodiment of the invention, the distance of the rotor lifted by the hydraulic gantry crane during the second-stage core pulling is greater than that of the first-stage core pulling.

In a possible embodiment according to the invention, the minimum of the length of the short axis is (3 times the length of the stator of the motor-the length of the rotor of the motor)/2 +300 mm. Typically, the minor axis length is about 2 m.

According to a possible embodiment of the present invention, the stub shaft comprises a shaft portion and a flange, the hole position of the flange is arranged corresponding to the hole position of the motor coupling, and the stub shaft is connected with the motor coupling through the flange.

According to a possible embodiment of the invention, the shaft part is welded to the flange, and the joint of the flange and the shaft part is provided with a plurality of reinforcing ribs.

The reinforcing ribs are arranged into right-angled triangular steel plates, one right-angle side of each right-angled triangular steel plate is welded with the flange plate, and the other right-angle side of each right-angled triangular steel plate is welded with the shaft part. The number of the right-angled triangle steel plates is totally 6, and the right-angled triangle steel plates are uniformly arranged around the periphery of the shaft part.

According to one possible embodiment of the invention, at least one lifting lug is arranged on the upper side of the outer surface of the shaft part; preferably, the number of the lifting lugs is 2, one is close to the flange, and the other is close to the end of the shaft part opposite to the flange.

And the shaft part of the short shaft, the flange plate and the lifting lug are all made of high-strength stainless steel. According to the condition of the current rough rolling motor, the whole short shaft structure is arranged and the fixed strength is required by 500 tons.

In the scheme, before the short shaft is installed, the motor is integrally hoisted to a field, then the short shaft is installed to one end of the rotor, and then the motor with the short shaft installed is hoisted to a selected limit point position; in this process, the stator is moved and lifted twice in succession. It can be understood that it is also possible to integrally hoist the motor to the limit position, mount the short shaft, and then perform the core pulling step. The scheme only needs to lift and move the stator once (integrally lift the motor for 1 time), so that the times of moving and lifting the stator can be reduced, and time and labor are saved. Therefore, the invention also provides a core penetrating method of the hydraulic motor with the ultimate short shaft, which comprises the following steps:

selecting a limit point: selecting a short shaft, and selecting a limit point in a core-pulling field; the limit point is used as a reference point for placing a motor, the limit point divides the core pulling field into a long section and a short section, the short section is slightly larger than the sum of the length of the rotating shaft at the rotor coupling side and the short shaft, and the long section is required to be larger than the sum of the length of the stator, the length of the rotor and the length of the short shaft; therefore, after the stator is placed at the limit point, the short shaft is close to but does not exceed the wall of the core pulling field, the residual space of the core pulling field is enough to provide the operation of the core pulling step, and meanwhile, the walking base of the hydraulic gantry crane is ensured not to be separated from the walking track;

integrally hoisting and moving to a limit point: a buffer isolation plate is plugged into an inner hole of a stator of the motor, so that the buffer isolation plate is arranged between the stator and a rotor, and the rotor is prevented from being directly contacted with the hole wall of the inner hole of the stator; sleeving two hoisting ropes on two hoisting points of the rotor rotating shaft respectively, wherein one hoisting point is close to a motor collecting ring, and the other hoisting point is close to the coupling side of the rotor and is called as a coupling side hoisting point; the motor is integrally hoisted to the position above the limit point by using the hydraulic gantry crane, then the hydraulic gantry crane falls back to place the motor stator at the position of the limit point, and one side of the motor stator is aligned with the limit point;

short shaft installation: after the motor is placed at the limit position, a short shaft is connected to a coupler of the motor rotor;

core pulling: the method comprises a first-stage core pulling, a second-stage core pulling and a third-stage core pulling; wherein:

first-stage core pulling: removing the buffer isolation plate, and adjusting the hydraulic gantry crane to enable a gap to be reserved between the periphery of the rotor and the inner hole wall of the stator; the hydraulic gantry crane lifts the rotor to move for a distance in the direction opposite to the short shaft until the side lifting point of the coupler is close to the stator, and stops moving, and a first support body is adopted to support the lower side of one end, provided with the coupler, of the rotor rotating shaft;

secondary core pulling: moving the suspension point on the side of the coupler to the short shaft to enable a certain position on the short shaft to form a new suspension point; the hydraulic gantry crane lifts the rotor to move for a distance in the direction opposite to the short shaft until the upper lifting point of the short shaft is close to one side of the stator, namely, the rotor stops moving, and a second support body is adopted to support the lower side of the short shaft;

and (3) third-stage core pulling: moving the hoisting rope at the position of the hoisting point on the short shaft to the position of the rotor rotating shaft close to the magnetic pole, wherein a certain position of the rotor rotating shaft close to the magnetic pole forms a new hoisting point; and hoisting the rotor by the hydraulic gantry crane to move for a distance in the direction opposite to the short shaft until the rotor and the short shaft are moved out of the stator, and finishing the core pulling operation by the motor.

The technical effects of the invention comprise: the method is a core drawing (threading) method which adopts an additional short shaft and a stator for placing a limit point, and is specially used for the core drawing and threading operation of a rough rolling main transmission motor of a large-scale rolling mill in a limit space. The method of the invention has the following advantages:

(1) under the condition that the core drawing (threading) field is limited, the method plans and sets limit points in advance, changes the core drawing (threading) of the motor from multi-frequency stator and rotor movement into the mode of only moving the stator twice (even 1 time), can carry out the core drawing (threading) work of a large motor, and is simple and convenient in working process.

(2) The method of the invention reduces the difficulty caused by the core drawing (threading) work of the main transmission motor and effectively reduces the labor intensity.

(3) The method of the invention adopts a special short shaft to carry out core drawing and penetrating operation, and is safe and reliable.

(4) The method provided by the invention uses the double-track double-beam crane in a matching manner, so that the operation is stable and rapid, the working efficiency is enhanced, and the construction safety is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic view of the stub shaft mounting and the stub shaft mounting steps of the preferred embodiment of the present invention.

FIG. 2 is a schematic view of the overall lifting step to the limit point according to the preferred embodiment of the present invention.

FIG. 3 is a state diagram of the first stage of core pulling according to the preferred embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating a second core pulling step according to a preferred embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a third stage of core pulling according to the preferred embodiment of the invention.

FIG. 6 is a schematic diagram illustrating a state of core pulling completion according to a preferred embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a dedicated stub according to a preferred embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

The method for threading the hydraulic motor with the ultimate short shaft in the preferred embodiment of the invention is shown in figures 1-6 and basically comprises the following steps:

(1) short shaft installation preparation: a buffer isolation plate (not shown) is plugged into the inner hole 121 of the stator 12 of the motor 100, so that the buffer isolation plate is arranged between the stator 12 and the rotor 11, and the rotor 11 is prevented from directly contacting with the hole wall of the inner hole 121 of the stator 12; two hoisting ropes 90 are respectively sleeved at two hoisting points of a rotating shaft 1111 of the rotor 11, one hoisting point A1 is close to a motor collecting ring 111, and the other hoisting point A2 is close to the side of a coupler 112 of the rotor and is defined as a coupler side hoisting point; and integrally hoisting the rotor 11 and the stator 12 to a core-pulling site P by adopting a hydraulic gantry crane.

As shown in fig. 1 in particular: the buffer isolation plate can be selected from 2-5mm rubber plates, such as 3mm rubber plates. Firstly, a 3mm rubber plate is inserted between the stator and the rotor, so that the rotor 11 is not in direct contact with the hole wall of the inner hole 12 of the stator in the hoisting process. Two 150t hoisting ropes 90 with freely adjustable lengths are adopted to cooperate with a hydraulic gantry crane to integrally hoist and move the motor 100 to a core-pulling construction site P.

(2) Short shaft installation: in the core space P, a stub shaft 40 is coupled to a coupling 112 (shown in fig. 1) of the rotor shaft 1111 in cooperation with a crane E in the factory.

The hydraulic gantry crane 80 comprises a first hoisting beam 81 and a second hoisting beam 82, hoisting ropes 90 are respectively connected to the lower parts of the first hoisting beam 81 and the second hoisting beam 82, the hoisting point corresponding to the first hoisting beam 81 is A1, and the hoisting point corresponding to the second hoisting beam 82 is A2. The first and second lifting beams 81 and 82 are respectively supported by a pair of traveling bases 811 and 821, and the traveling bases 811 and 821 travel on a pair of traveling rails R preset on the ground.

Wherein, in some embodiments, the length of the walking track R is 15 meters, the total length of the rotor 11 is 7.5 meters, the bottom width of the walking bases 811 and 821 is 3 meters, and the length of the short axis is 2 meters.

(3) Selection of a limit point: selecting a point in a core pulling field as a limit point M for placing a stator of a motor, wherein the limit point M divides the core pulling field into a long section and a short section of distances L1 and L2, the short section of distance L1 is slightly larger than the sum f1 of the length of a rotating shaft part and the length of a short shaft 40 on the side of a rotor coupling (see fig. 2), and the long section of distance L2 must be larger than the sum of the length of the stator, the length of the rotor and the length of the short shaft (see fig. 6); after the stator 12 is placed at the limit point M, the short shaft 40 approaches to but does not exceed the wall W of the core pulling field P, and the remaining space of the core pulling field P is enough to provide the core pulling operation, and it is also ensured that the traveling bases 811 and 821 of the hydraulic gantry crane 80 do not fall off the traveling track R;

specifically, the selection of the limit point M needs to satisfy 3 conditions: firstly, the method comprises the following steps: after the motor 100 is placed in alignment with the limit point M, the distance from the coupling side lifting point A2 to the tail end of the traveling track is more than or equal to 1/2 of the width of the traveling base 821, so that the hydraulic gantry crane can normally travel and work, and the traveling base 821 is prevented from moving out of the traveling track R and derailing; secondly, the method comprises the following steps: after the short shaft 40 is connected to the coupling 112 of the rotating shaft 1111, the end of the short shaft 40 is close to but not against the wall W of the factory building; thirdly, the method comprises the following steps: the floor strength of the limit point M has enough supporting strength, the requirement of the motor for drawing the core can be met, and the danger of inclination of the stator of the motor due to ground collapse is prevented.

In general, the width of the traveling base is 3m, and in order to ensure normal lifting and displacement of the hydraulic gantry crane, the distance from the lifting point A2 on the coupling side to the tail end of the traveling rail R needs to be more than or equal to 1.5 m. In general, in order to satisfy the supporting strength required for the core pulling-through of the motor 100, it is considered that the supporting strength at the position can bear the weight of the entire motor.

(4) Integrally hoisting and moving to a limit point: the motor 100 connected with the short shaft 40 is integrally hoisted to the position above the limit point M by using the hydraulic gantry crane 80, a flat backing plate 70 is paved at the position of the limit point M in advance, then the hydraulic gantry crane 80 falls back to place the stator 12 of the motor 100 at the position of the limit point M and is placed on the backing plate 70, the stability of the stator 12 of the motor 100 is ensured, the damage caused by collision with the ground is prevented, and the stator 12 of the motor 100 is aligned with the limit point M on one side (see fig. 2).

(5) Core pulling: referring to the core-pulling steps shown in fig. 3-5, the core-pulling steps include a first-stage core-pulling (see fig. 3), a second-stage core-pulling (see fig. 4) and a third-stage core-pulling and core-pulling completion (see fig. 5-6); wherein:

referring to fig. 3, the first stage of core pulling: and removing the buffer isolation plate, and adjusting the hydraulic gantry crane 80 to enable a gap to be formed between one circumference of the rotor 11 and the hole wall of the inner hole 121 of the stator 12, wherein the gap is preferably a uniform annular gap. Next, the rotor 11 is lifted by the hydraulic gantry crane 80 to move a distance C1 in a direction opposite to the short shaft 40 (or the limit point M) until the distance X between the coupling-side lifting point a2 and the stator 12 is about 100mm, which indicates that the lifting rope 90 and the stator 12 are soon in contact, and the movement is stopped to prevent the collision damage, and the first support 60 is used to support the lower side of the rotor shaft 1111 where the coupling 112 is provided.

Referring to fig. 4, the second-stage core pulling: moving the hoisting ropes 90 of the coupling-side hoisting point a2 to the stub axle 40, so that a new hoisting point a 2' is formed at a certain position on the stub axle 40; the hydraulic gantry crane 80 is adjusted to have a gap between one circumference of the rotor 11 and the hole wall of the inner hole 121 of the stator 12, and preferably, the gap is a uniform annular gap. Next, the rotor 11 is hoisted by the hydraulic gantry crane 80 to travel a distance C2(C2, see fig. 5) in the direction opposite to the short shaft (or the limit point M) until the distance X between the hoisting point a 2' on the short shaft 40 and the stator 12 is about 100mm, which indicates that the hoisting rope 90 and the stator 12 are in contact soon, and the movement is stopped to prevent collision damage, and the rotor is supported on the lower side of the short shaft by using a second support 50; wherein C2 is greater than C1.

Referring to fig. 5-6, the third stage of core pulling and core pulling completion: moving the hoisting rope 90 at the position of the hoisting point A2 'on the short shaft to the position of the rotor rotating shaft 111 close to the magnetic pole 113, wherein a certain position of the rotor rotating shaft 111 close to the magnetic pole 113 forms a new hoisting point A2'; the hydraulic gantry crane 80 is adjusted to have a gap between one circumference of the rotor 11 and the hole wall of the inner hole 121 of the stator 12, and preferably, the gap is a uniform annular gap. Next, the hydraulic gantry crane 80 lifts the rotor 11 to move a distance C3(C3 is shown in fig. 6) in a direction opposite to the short shaft 40 (or the limit point M) (the arrow in fig. 5 indicates the moving direction), so that the rotor 11 and the short shaft 40 are moved out of the stator 12, and the motor completes the core pulling operation. Wherein C3 is greater than C2.

According to the invention, the core penetrating step and the core pulling step are an inverse process, and the core penetrating step comprises a first-stage core penetrating step, a second-stage core penetrating step and a third-stage core penetrating step:

referring to fig. 6, the suspension points are respectively arranged at two ends of the rotor rotating shaft, one suspension point a1 is close to the side of the collector ring, and the other suspension point a2 ″ is close to the rotor magnetic pole 113; the hydraulic gantry crane 80 lifts the rotor to move for a distance C3 towards the direction of the short shaft 40 until the lifting rope 90 close to the lifting point A2' of the rotor magnetic pole 113 is close to the left side of the stator 12, and the movement needs to be stopped for preventing collision damage; the stub shaft 40 penetrates into the stator and then penetrates out of the stator to the other side of the stator 12, and is supported on the lower side of the stub shaft 40 through a supporting body;

second-stage core penetration: referring to fig. 5 and 4, a new suspension point a 2' is formed by moving a suspension point a2 ″ from a position close to the rotor pole 113 onto the stub shaft 40; the hydraulic gantry crane 80 lifts the rotor 11 to travel a distance C2 in the direction of the short shaft 40 until the lifting rope 90 on the short shaft 40 is limited by the moving range of the traveling bases 811 and 821 of the hydraulic gantry crane 80 (the traveling base 812 is separated from the traveling track R due to continuous movement), and cannot move continuously in the direction of the short shaft 40 any more, namely, stops moving;

third-stage core penetration: referring to fig. 4 and 3, the suspension point a 2' is moved from the short shaft 40 to the stator direction to a position where the rotor rotation shaft is close to the coupler, so as to form a new suspension point a 2; the hydraulic gantry crane 80 lifts the rotor 11 to move a distance towards the short shaft 40 again until all the magnetic poles 113 of the rotor 11 enter the stator 12, and the short shaft 40 is removed, so that the core penetrating operation of the motor 100 is completed.

Referring next to fig. 7, a schematic view of a stub shaft 40 is shown, which is specific to the method of the present invention. The short shaft 40 comprises a shaft part 41 and a flange 42, the hole position of the flange 42 is arranged corresponding to the hole position of the coupler 112 of the motor 100, and the short shaft 40 is firmly connected with the coupler 112 of the motor by the flange 42. The stub shaft 40 has two ears 44, 45 spaced apart, the ear 44 being adjacent the flange 42 and the ear 45 being adjacent the end of the stub shaft 40, 400mm from the end. Both lifting lugs 44, 45 are provided with lifting holes with a radius of about 150 mm. The shaft portion 41 is welded to the flange 42, and a plurality of ribs 43 are provided at the joint between the flange 42 and the shaft portion 41 to enhance the welding strength. The reinforcing ribs 43 are made of right-angled triangular steel plates, one of which is welded to the flange 42, and the other of which is welded to the shaft 41. The number of the right-angled triangular steel plates is 6 in total, and the right-angled triangular steel plates are uniformly arranged around the outer periphery of the shaft portion 41. The minimum of the minor axis length is (3 motor stator length-motor rotor length)/2 +300 mm. Usually, the length of the short shaft is about 2m according to the calculation of a common rough rolling motor model. According to the condition of the current rough rolling motor, wherein the shaft part, the flange plate and the lifting lug of the short shaft are all made of high-strength stainless steel, and the structural arrangement and the fixing strength of the whole short shaft are designed according to the requirement of 500 tons.

Example 2:

example 2 is identical to example 1 in the core pulling step. The method is different only in three steps of short shaft installation preparation, short shaft installation, limit point selection, integral hoisting and moving to the limit point, changing into 'limit point selection, integral hoisting and moving to the limit point and short shaft installation' in the embodiment 1. This is because the selection of the limit point does not have to be performed after the step of short shaft installation is completed, and after the short shaft 40 of a certain specification and length is selected, the limit point M can be found first according to the actual situation of the core pulling field, and then the short shaft 40 is connected to the coupling 112 of the rotating shaft after the motor 100 is directly hoisted to the position of the limit point M, and then the operation of the core pulling step is performed. It will be appreciated that such an arrangement is also possible. The scheme only needs to lift and move the stator once (the whole body only needs to lift the motor for 1 time), so that the times of moving and lifting the stator can be reduced, and time and labor are saved. Therefore, the invention also claims the technical scheme.

The above detailed description of embodiments of the invention presented in the drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (8)

1. A core penetrating method of a hydraulic motor with a limited short shaft is characterized by comprising the following steps:

short shaft installation preparation: a buffer isolation plate is plugged into an inner hole of a stator of the motor, so that the buffer isolation plate is arranged between the stator and a rotor, and the rotor is prevented from being directly contacted with the hole wall of the inner hole of the stator; sleeving two hoisting ropes on two hoisting points of the rotor rotating shaft respectively, wherein one hoisting point is close to a motor collecting ring, and the other hoisting point is close to the coupling side of the rotor and is defined as a coupling side hoisting point; integrally hoisting the rotor and the stator to a core-pulling field by using a hydraulic gantry crane; the hydraulic gantry crane comprises a first hoisting beam and a second hoisting beam, the first hoisting beam and the second hoisting beam are respectively supported by a pair of walking bases, and the walking bases walk on a pair of walking rails preset on the ground;

short shaft installation: in the core-pulling place, a short shaft is connected with a coupler of the rotor rotating shaft; the minimum value of the short shaft length is (3 times of the length of the motor stator-the length of the motor rotor)/2 +300 mm;

selecting a limit point: selecting a point in a core pulling field as a limit point for placing a stator of the motor, wherein the limit point divides the core pulling field into a long-section distance and a short-section distance, the short-section distance is slightly larger than the sum of the length of a rotating shaft on the side of a rotor coupler and the length of a short shaft, and the long-section distance needs to be larger than the sum of the length of the stator, the length of the rotor and the length of the short shaft; therefore, after the stator is placed at the limit point, the short shaft is close to but does not exceed the wall of the core pulling field, the residual space of the core pulling field is enough to provide the operation of the core pulling step, and meanwhile, the walking base is ensured not to be separated from the walking track; the selection of the limit point needs to meet 3 conditions; firstly, the method comprises the following steps: when the motor stator is placed in alignment with the limit point, the distance between the side lifting point of the coupler and the tail end of the traveling track is not less than 1/2 traveling base width, so that the hydraulic gantry crane can normally travel and work; secondly, the method comprises the following steps: after the short shaft is connected with the coupler, the tail end of the short shaft cannot abut against the wall of the factory building; thirdly, the method comprises the following steps: the floor strength of the extreme point position can support the motor;

integrally hoisting and moving to a limit point: the motor connected with the short shaft is integrally hoisted and moved to the position above the limit point by using the hydraulic gantry crane, then the hydraulic gantry crane falls back to place the motor stator at the position of the limit point, and one side of the motor stator is aligned with the limit point;

core pulling: the method comprises a first-stage core pulling, a second-stage core pulling and a third-stage core pulling; wherein:

first-stage core pulling: removing the buffer isolation plate, and adjusting the hydraulic gantry crane to enable a gap to be reserved between the periphery of the rotor and the inner hole wall of the stator; the hydraulic gantry crane lifts the rotor to move for a distance in the direction opposite to the short shaft until the side lifting point of the coupler is close to the stator, and stops moving, and a first support body is adopted to support the lower side of one end, provided with the coupler, of the rotor rotating shaft;

secondary core pulling: moving the suspension point on the side of the coupler to the short shaft to enable a certain position on the short shaft to form a new suspension point; the hydraulic gantry crane lifts the rotor to move for a distance in the direction opposite to the short shaft until the upper lifting point of the short shaft is close to one side of the stator, namely, the rotor stops moving, and a second support body is adopted to support the lower side of the short shaft;

and (3) third-stage core pulling: moving the suspension point on the short shaft to a position of the rotor rotating shaft close to the magnetic pole, wherein a certain position of the rotor rotating shaft close to the magnetic pole forms a new suspension point; and hoisting the rotor by the hydraulic gantry crane to move for a distance in the direction opposite to the short shaft until the rotor and the short shaft are moved out of the stator, and finishing the core pulling operation by the motor.

2. The method for threading the hydraulic motor with the short limit shaft according to claim 1, further comprising a threading step comprising a first-stage threading, a second-stage threading and a third-stage threading:

in the first stage of core penetration, hoisting points are respectively arranged at two ends of the rotor rotating shaft, one hoisting point is close to the side of the collecting ring, and the other hoisting point is close to the rotor magnetic pole; the hydraulic gantry crane lifts the rotor to move for a certain distance in the direction of the short shaft until a lifting point close to the magnetic pole of the rotor is close to one side of the stator, and then stops moving, at the moment, the short shaft penetrates into the stator and then penetrates out to the other side of the stator, and a support body is adopted to support the lower side of the short shaft;

second-stage core penetration: moving a suspension point from a position near the rotor pole onto the stub shaft; the hydraulic gantry crane lifts the rotor to move for a certain distance in the direction of the short shaft until the lifting rope corresponding to the short shaft cannot move continuously in the direction of the short shaft due to the limitation of the moving range of the traveling base, and then the hydraulic gantry crane stops;

third-stage core penetration: moving a lifting point from the short shaft to a position where the rotating shaft is close to a coupler; and hoisting the rotor by the hydraulic gantry crane to move a certain distance in the direction of the short shaft until all the magnetic poles of the rotor enter the stator, and detaching the short shaft to finish the core penetrating operation of the motor.

3. The hydraulic motor threading method of a limit stub shaft according to claim 1, characterized in that in the stub shaft installation preparation step, the buffer isolation plate is a rubber plate with a thickness of 2-5 mm.

4. The method for penetrating the core of the hydraulic motor with the short limit shaft according to claim 1, wherein in the step of integrally hoisting and moving the whole body to the limit point, a base plate is paved at the position of the limit point in advance, and the base plate ensures that a stator of the motor is placed stably and prevents the stator from being damaged.

5. A method as claimed in claim 1, wherein the stub shaft comprises a shaft portion and a flange, the holes of the flange are arranged corresponding to the holes of the motor coupling, and the stub shaft is connected with the motor coupling via the flange.

6. The method of claim 5, wherein the shaft portion is welded to the flange, and a plurality of reinforcing ribs are arranged at the joint of the flange and the shaft portion.

7. A hydraulic motor threading method according to claim 6, characterized in that at least one lifting lug is arranged on the upper side of the outer surface of the shaft part.

8. A core penetrating method for a hydraulic motor with a limited short shaft comprises the following steps:

selecting a limit point: selecting a short shaft, and selecting a limit point in a core-pulling field; the limit point is used as a reference point for placing the motor, the limit point divides the core pulling field into a long section distance and a short section distance, the short section distance is slightly larger than the sum of the length of a rotating shaft at the side of a rotor coupler and the length of the short shaft, and the long section distance needs to be larger than the sum of the length of a stator, the length of a rotor and the length of the short shaft; therefore, after the stator is placed at the limit point, the short shaft is close to but does not exceed the wall of the core pulling field, the residual space of the core pulling field is enough to provide the operation of the core pulling step, and meanwhile, the walking base of the hydraulic gantry crane is ensured not to be separated from the walking track; the selection of the limit point needs to meet 3 conditions; firstly, the method comprises the following steps: when the motor stator is placed in alignment with the limit point, the distance between the side lifting point of the coupler and the tail end of the traveling track is not less than 1/2 traveling base width, so that the hydraulic gantry crane can normally travel and work; secondly, the method comprises the following steps: after the short shaft is connected with the coupler, the tail end of the short shaft cannot abut against the wall of the factory building; thirdly, the method comprises the following steps: the floor strength of the extreme point position can support the motor; the minimum value of the short shaft length is (3 times of the length of the motor stator-the length of the motor rotor)/2 +300 mm;

integrally hoisting and moving to a limit point: a buffer isolation plate is plugged into an inner hole of a stator of the motor, so that the buffer isolation plate is arranged between the stator and a rotor, and the rotor is prevented from being directly contacted with the hole wall of the inner hole of the stator; sleeving two hoisting ropes on two hoisting points of the rotor rotating shaft respectively, wherein one hoisting point is close to a motor collecting ring, and the other hoisting point is close to the coupling side of the rotor and is called as a coupling side hoisting point; the motor is integrally hoisted to the position above the limit point by using the hydraulic gantry crane, then the hydraulic gantry crane falls back to place the motor stator at the position of the limit point, and one side of the motor stator is aligned with the limit point;

short shaft installation: after the motor is placed at the limit position, a short shaft is connected to a coupler of the motor rotor;

core pulling: the method comprises a first-stage core pulling, a second-stage core pulling and a third-stage core pulling; wherein:

first-stage core pulling: removing the buffer isolation plate, and adjusting the hydraulic gantry crane to enable a gap to be reserved between the periphery of the rotor and the inner hole wall of the stator; the hydraulic gantry crane lifts the rotor to move for a distance in the direction opposite to the short shaft until the side lifting point of the coupler is close to the stator, and stops moving, and a first support body is adopted to support the lower side of one end, provided with the coupler, of the rotor rotating shaft;

secondary core pulling: moving the suspension point on the side of the coupler to the short shaft to enable a certain position on the short shaft to form a new suspension point; the hydraulic gantry crane lifts the rotor to move for a distance in the direction opposite to the short shaft until the upper lifting point of the short shaft is close to one side of the stator, namely, the rotor stops moving, and a second support body is adopted to support the lower side of the short shaft;

and (3) third-stage core pulling: moving the hoisting rope at the position of the hoisting point on the short shaft to the position of the rotor rotating shaft close to the magnetic pole, wherein a certain position of the rotor rotating shaft close to the magnetic pole forms a new hoisting point; and hoisting the rotor by the hydraulic gantry crane to move for a distance in the direction opposite to the short shaft until the rotor and the short shaft are moved out of the stator, and finishing the core pulling operation by the motor.

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