CN114890109A - A large transformer steering device and method - Google Patents

Abstract

The invention provides a large-scale transformer steering device and a method, wherein the steering device comprises two steel rails, the extending directions of the two steel rails are different, and annular turntables are arranged at the corners of the two steel rails; the annular turntable is provided with a turntable steel rail, a transition steel rail is arranged between the turntable steel rail and the steel rail to form connection between the turntable steel rail and the steel rail, the center of the annular turntable is provided with a center buttress, and the annular turntable rotates along the center buttress at the center to form steering of the large transformer. The steering device provided by the invention can realize steering of a 300 t-grade large transformer, and has a small turning radius; the steering method provided by the invention has the advantages that the steering process is simple, the transformer does not need to be lifted, the steering is realized by the rolling friction of the support balls, the resistance is small, and the required tension of the winch is small; the track of the support ball in the steering device provided by the invention is fixed, the stress is uniform, each support ball bears the gravity of the transformer stably in the steering process, and the reliability is high.

Description

A large transformer steering device and method

technical field

The invention belongs to the technical field of large-scale transformer installation, and in particular relates to a large-scale transformer steering device and method.

Background technique

Many large-scale pumped-storage power plants and hydropower plants are located in the mountains, and the transformers need to be transported to the mountains. Many power plants are restricted by terrain and geological conditions. The traffic tunnel entering the plant is perpendicular to the transformer installation room, and the transformer needs to be installed on one side. turn. Large-scale transformers with a capacity of 360MVA and above are elongated in shape, and the turning radius of the transformer transporter in the underground workshop is relatively large. If the transporter is used to turn, not only the investment in the excavation of the underground workshop is large, but also the technical level of the driver is very high. Mistakes result in greater losses.

Chinese patent CN102110955A discloses a steering device based on an annular track, but since the pulley of the trolley is straight, and the track circular arc is deviated, it is easy to get stuck.

Chinese patent CN207107816U discloses a steering structure based on a turntable. The turntable uses a large number of small balls, the balls have no fixed track, and the small balls bear less pressure. During the steering process, the balls are easily distributed unevenly, resulting in some balls. It is crushed, causing the transformer to lose its balance and tilt; and when turning in this way, it is necessary to use tools such as jacks to lift the transformer, which is time-consuming and labor-intensive, and is suitable for turning transformers weighing less than 200t.

SUMMARY OF THE INVENTION

The first objective of the present invention is to provide a large-scale transformer steering device in view of the deficiencies in the prior art.

For this reason, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

A large-scale transformer steering device comprises two steel rails, the extending directions of the two steel rails are different, and an annular turntable is arranged at the corners of the two steel rails;

The annular turntable is provided with a turntable rail, and a transition rail is arranged between the turntable rail and the rail to form the connection between the turntable rail and the rail. The center pier is turned to form a turn for the large transformer.

While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:

As a preferred technical solution of the present invention: the annular turntable includes a turntable rail, a rail backing plate, an anchor bolt, a main concrete block, a steel plate, and a rib;

The turntable rail is welded on a rail backing plate, the rail backing plate is fixed to the main body concrete by anchor bolts, and the steel plate is fixed to the lower surface of the main body concrete by inserting ribs;

A plurality of circles of support balls are arranged below the annular turntable along the central support pier.

As a preferred technical solution of the present invention, a U-shaped ring is arranged on the edge of the annular turntable, and the U-shaped ring on the annular turntable is connected with the traction rope on the mobile hoist to pull the annular turntable to rotate.

As a preferred technical solution of the present invention: two U-shaped rings are arranged on the outer foundation of the annular turntable, and the two U-shaped rings are at a certain angle and the angle meets the steering angle of the large transformer, and the U-shaped rings on the foundation are positioned The pin is matched with the U-ring on the annular turntable to limit the annular turntable.

As a preferred technical solution of the present invention: an annular concave steel ring is pre-buried in the concrete below the support ball, and the annular concave steel ring forms a rotating orbit of the support ball;

The lower surface of the steel plate is provided with a steel plate groove corresponding to the annular concave steel ring, and the steel plate groove cooperates with the annular concave steel ring to respectively form a rotating upper track and a rotating lower track for supporting the ball.

As a preferred technical solution of the present invention: the center angle of the steel plate groove corresponding to the support ball is a ₁ , the annular concave steel ring corresponding to the center angle of the support ball a ₂ >1.05a ₁ ; the steel plate thickness H≥2r [1-cos(a ₁ /2)], where r is the radius of the support sphere; the transport weight of the transformer is M Newtons; the support sphere can be hollow or solid, and the pressure it can withstand P _a :

As a preferred technical solution of the present invention: one end of the turntable rail is welded with a blocking arm, and the other end of the turntable rail is arranged with a temporary stop to limit the trolley carrying the large transformer;

The advance blocking arm is located at the front end of the trolley before the steering change of the large transformer, and after the annular turntable is turned, the advancing blocking arm is located at the rear end of the trolley to facilitate the trolley to enter the next rail.

环形转盘的外半径R₄＝2R₁。As a preferred technical solution of the present invention: the center distance of the rail is L ₁ ; the length of the steel rail of the turntable on the annular turntable is L ₁ , and its corresponding circumferential angle is 90°; the inner radius of the annular turntable is

The outer radius of the annular turntable is R ₄ =2R ₁ .

As a preferred technical solution of the present invention: the radius of the support ball under the annular turntable is r=0.45R ₁ ;

The track radius of the inner ring of the support ball is R ₂ =1.25R ₁ , and there are 16 support balls in the inner ring;

The track radius of the outer ring of the support ball is R ₃ =1.75R ₁ , and there are 22 support balls in the outer ring.

As a preferred technical solution of the present invention, the length L ₂ of the transition rail is in the range of 0.1L ₁ to 0.12L ₁ , wherein L ₁ is the center distance of the rail; the transition rail is used to adjust the There is a gap of 2 to 3 mm between the rail and the turntable rail.

Another object of the present invention is to provide a steering method for a large transformer in view of the deficiencies in the prior art.

For this reason, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

A steering method for a large transformer, comprising the following steps:

S1. Put the large transformer on the trolley, and arrange the transition rail between the rail where the large transformer is currently located and the turntable rail; the trolley carrying the large transformer is transported along the rail to the turntable rail on the ring turntable, and the front pulley of the trolley bears against it. A stop arm located on the circular turntable;

S2. Use a temporary block to withstand the rear pulley of the trolley;

S3. Pull out the positioning pin located between the U-shaped ring on the outer foundation of the annular turntable and the U-shaped ring of the annular turntable, and put the traction rope of the mobile winch on the U-shaped ring of the annular turntable;

S4. Start the mobile winch, slowly rotate the annular turntable by 90 degrees, and stop when the U-ring of the annular turntable is aligned with another U-ring on the outer foundation of the annular turntable. Then the two U-rings are inserted into the positioning point, and the The ring turntable is locked and fixed;

S5. Transfer the transition rail to another rail. At this time, the blocking arm on the annular turntable is just at the rear end of the trolley. Remove the temporary block and the large transformer will complete the steering.

The present invention provides a large transformer steering device and method, which have the following beneficial effects compared with the prior art:

1), the steering device provided by the present invention can realize the steering of a large transformer of 300t level, and the turning radius is small;

2), the steering method provided by the present invention has a simple steering process, does not need to lift the transformer, and relies on the rolling friction of the support ball to realize the steering, the resistance is small, and the required hoist pulling force is small;

3) The track of the support ball in the steering device provided by the present invention is fixed, and the force is evenly applied. During the steering process, each support ball bears the gravity of the transformer smoothly and has high reliability.

Description of drawings

FIG. 1 is a plan view of the large transformer steering device provided by the present invention in an initial state.

FIG. 2 is a plan layout view of the large-scale transformer steering device provided by the present invention when it is being pulled by a hoist.

FIG. 3 is a plan layout view of the large-scale transformer steering device provided by the present invention after the steering is completed.

FIG. 4 is an A-A sectional view in FIG. 1 .

Figure 5 is a diagram showing the arrangement of the support ball, the steel plate groove and the annular concave steel ring.

Figure 6 is a diagram showing the fixation of the trolley on the annular turntable.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

A large transformer steering device includes a rail 1, an annular turntable 2, a central buttress 3, a transition rail 4, a support ball 5, a U-shaped ring 6, a positioning pin 7, a blocking arm 8, and a temporary stop 9.

The annular turntable 2 has a turntable rail 2.1, a rail backing plate 2.2, an anchor bolt 2.3, a main concrete block 2.4, a steel plate 2.5, a rib 2.6, a U-shaped ring 2.7, and an annular concave steel ring 2.8. The turntable rail 2.1 is welded on the rail backing plate 2.2, and the rail backing plate 2.2 is fixed on the main concrete 2.4 through the anchor bolts 2.3; Two circles of support balls 5 are arranged below the annular turntable 2 ; an annular concave steel ring 2.8 is pre-buried in the concrete below the support balls 5 ;

The center distance of the rail 1 is L ₁ =1.5m, the length of the turntable rail 2.1 on the annular turntable 2 is L ₁ , and its corresponding circumferential angle is 90°; the inner radius of the annular turntable R ₁ =1.06m; Radius R ₄ =2.12m. The steel plate 2.5 has two steel plate grooves, which are aligned with the center of the embedded annular concave steel ring 2.8, and together form a sliding track for supporting the ball 5. The radius of the support ball 5 is r=0.477m; the inner ring track radius of the support ball is R ₂ =1.325m, and there are 16 support balls in the inner ring; the outer ring track radius of the support ball is R ₃ =1.855m, and the outer ring has a total of 22 a support ball.

The center angle a ₁ of the steel plate groove corresponding to the support ball is 30°, the annular concave steel ring 2.8 corresponding to the center angle a ₂ of the support ball is 32°; the thickness H of the steel plate 2.5 is 4mm; the transport weight of the large transformer is 3000kN; The ball can be hollow or solid, and its pressure _Pa is 2Mpa.

The transition rail 4 is placed between the rail 1 and the turntable rail 2.1 on the annular turntable ₂ , and its length L2 is 0.16m. The transition rail 4 can be moved to adjust the transition rail 4 and the rail 1 and the turntable rail 2.1 have a gap of 2mm.

The ring-shaped turntable 2 has a U-shaped ring on the center line of the two rails, which is in the same direction as the opening of the U-shaped ring on the ring-shaped turntable to facilitate the front and rear of the turning. U-ring on the turntable.

A steering method for a large transformer, comprising the following steps:

S1. Put the large transformer on the trolley, and arrange the transition rail between the rail where the large transformer is currently located and the turntable rail; the trolley carrying the large transformer is transported along the rail to the turntable rail on the ring turntable, and the front pulley of the trolley bears against it. A stop arm located on the circular turntable;

S2. Use a temporary block to withstand the rear pulley of the trolley;

S3. Pull out the positioning pin located between the U-shaped ring on the outer foundation of the annular turntable and the U-shaped ring of the annular turntable, and put the traction rope of the mobile winch on the U-shaped ring of the annular turntable;

S4. Start the mobile winch, slowly rotate the annular turntable by 90 degrees, and stop when the U-ring of the annular turntable is aligned with another U-ring on the outer foundation of the annular turntable. Then the two U-rings are inserted into the positioning point, and the The ring turntable is locked and fixed;

S5. Transfer the transition rail to another rail. At this time, the blocking arm on the annular turntable is just at the rear end of the trolley. Remove the temporary block and the large transformer will complete the steering.

The above-mentioned specific embodiments are used to explain the present invention, and are only preferred embodiments of the present invention, rather than limiting the present invention. Any modification or equivalent replacement made to the present invention is within the spirit of the present invention and the protection scope of the claims. , improvements, etc., all fall within the protection scope of the present invention.

Claims (11)

1. A large-scale transformer turns to device which characterized in that: the large transformer steering device comprises two steel rails, the extending directions of the two steel rails are different, and annular turntables are arranged at the corners of the two steel rails;

the annular turntable is provided with a turntable steel rail, a transition steel rail is arranged between the turntable steel rail and the steel rail to form connection between the turntable steel rail and the steel rail, the center of the annular turntable is provided with a center buttress, and the annular turntable rotates along the center buttress at the center to form steering of the large transformer.

2. The large transformer steering device according to claim 1, wherein: the annular turntable comprises turntable steel rails, steel rail base plates, foundation bolts, main concrete blocks, steel plates and joint bars;

the turntable steel rail is welded on a steel rail base plate, the steel rail base plate is fixed on the main concrete through anchor bolts, and the steel plate is fixed on the lower surface of the main concrete through joint bars;

and a plurality of circles of supporting balls are arranged below the annular turntable along the central buttress.

3. Large transformer turning device according to claim 1 or 2, characterized in that: the edge of the annular turntable is provided with a U-shaped ring, and the U-shaped ring on the annular turntable is connected with a traction rope on the movable winch to pull the annular turntable to rotate.

4. The large transformer steering device according to claim 3, wherein: set up two U type rings on the outside ground of annular carousel, be certain angle and angle between two U type rings and satisfy large-scale transformer's steering angle, the U type ring on the ground is through the supporting spacing annular carousel of U type ring on locating pin and the annular carousel.

5. The large transformer steering device according to claim 2, wherein: an annular concave steel ring is pre-embedded in the concrete below the supporting ball, and the annular concave steel ring forms a rotating track of the supporting ball;

the lower surface of the steel plate is provided with a steel plate groove corresponding to the annular concave steel ring, and the steel plate groove is matched with the annular concave steel ring to form a rotary upper track and a rotary lower track of the supporting ball respectively.

6. The large transformer steering device according to claim 5, wherein: the steel plate groove corresponds to the sphere center angle of the supporting ball and is a ₁ The angle a of the annular concave steel ring corresponding to the center of the supporting ball ₂ ＞1.05a ₁ (ii) a The thickness H of steel plate is greater than or equal to 2r 1-cos (a) ₁ /2)]Wherein r is the radius of the support sphere; the transport weight of the transformer is M newtons; pressure P bearable by support ball _a ：

7. The large transformer steering device according to claim 1, wherein: a feed stopping arm is welded at one end of the turntable steel rail, and a temporary stop block is arranged at the other end of the turntable steel rail to limit a trolley loaded with a large transformer;

the advance-stopping arm is positioned at the front end of the trolley before the steering change of the large transformer, and the advance-stopping arm is just positioned at the rear end of the trolley after the annular turntable is steered so as to facilitate the trolley to enter the next steel rail.

8. Large transformer turning device according to claim 1 or 2, characterized in that: the center distance of the steel rails is L ₁ (ii) a The length of the turntable steel rail on the annular turntable is L ₁ The corresponding circumferential angle is 90 degrees; the inner radius of the annular turntable is

Ring rotorOuter radius of the disc R ₄ ＝2R ₁ 。

9. The large transformer steering device according to claim 8, wherein: the radius of the supporting ball under the annular turntable is 0.45R ═ R ₁ ；

The radius of the track of the inner ring of the supporting ball is R ₂ ＝1.25R ₁ The inner ring has 16 supporting balls;

the radius of the track of the outer ring of the supporting ball is R ₃ ＝1.75R ₁ And the outer ring has 22 supporting balls.

10. The large transformer steering device according to claim 1, wherein: length L of the transition rail ₂ In the range of 0.1L ₁ ～0.12L ₁ Wherein L is ₁ The center distance of the steel rails; the transition steel rail is used for adjusting gaps of 2-3 mm between the transition steel rail and the steel rail and between the transition steel rail and the turntable steel rail respectively.

11. A steering method of a large transformer is characterized in that: the steering method comprises the following steps:

s1, placing the large transformer on the trolley, and arranging the transition steel rail between the current steel rail of the large transformer and the turntable steel rail; a trolley for bearing the large transformer is transported to a turntable steel rail on the annular turntable along the steel rail, and a front side pulley of the trolley props against a stopping arm on the annular turntable;

s2, adopting a temporary stop block to prop against a rear pulley of the trolley;

s3, pulling out a positioning pin between the U-shaped ring on the foundation outside the annular turntable and the U-shaped ring of the annular turntable, and sleeving a traction rope of the mobile winch on the U-shaped ring of the annular turntable;

s4, starting the movable winch, slowly rotating the annular turntable by 90 degrees until the U-shaped ring of the annular turntable is aligned with the other U-shaped ring on the foundation outside the annular turntable, and then inserting the two U-shaped rings into the positioning pin to lock and fix the annular turntable;

and S5, transferring the transition steel rail to another steel rail, wherein the advance stopping arm on the annular turntable is just positioned at the rear end of the trolley, and the temporary stop block is removed, so that the large transformer can complete steering.

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