Low-speed auxiliary turning gear

Abstract

A low-speed auxiliary turning gear comprises a U-shaped frame, a placing table, a speed reducing motor and two arc-shaped clamping pieces, the opening of the U-shaped frame faces downwards, the speed reducing motor is located at a certain height through the U-shaped frame, and therefore the speed reducing motor and a rotor of a dynamic steam turbine can be located at the same height. An output shaft of the gear motor is in transmission connection with the rotor of the steam turbine through a coupler, the gear motor is started to drive the rotor of the steam turbine to rotate, so that turning is carried out, turning efficiency is improved, and the strength of workers is reduced. The two arc-shaped clamping pieces capable of moving relatively are arranged on the placing table, and the gear motor is fixed between the two arc-shaped clamping pieces. During turning, the gear motor is clamped and fixed by the two arc-shaped clamping pieces, and when turning is not needed, the gear motor can be detached for other purposes.

Description

Technical Field

[0001] The utility model relates to the technical field of power generation, in particular to a low-speed auxiliary turning device. Background Art

[0002] The applicant's energy center has two 80MW dual-super-generator reduction motor units. The units use ultra-high temperature and ultra-high pressure main steam sources, combined with single reheating technology, which greatly improves the power generation efficiency of the units. They are high-efficiency units designed for steel plant waste heat utilization, and can generate 1 billion kWh of electricity annually. They are the company's model project for energy conservation and consumption reduction.

[0003] After four years of operation, the two units maintained overall stable performance. However, a significant risk arose when the turbine rotors could not be cranked properly after three shutdowns and decouplings (to ensure unit safety, the turbines required a prolonged period of low-speed cranking after shutdown). The cranking reduction motor failed to crank properly due to the asynchronous expansion of the dynamic and static parts within the turbine unit, which in turn caused dynamic and static friction. Severe dynamic and static friction caused the cranking reduction motor to overload and fail to start. After the turbines were decoupled, the internal cylinder temperature remained above 500°C. Failure to crank the turbine rotors promptly could result in serious equipment accidents such as rotor bending and deformation. Manual cranking was necessary when the turbine rotors could not be cranked properly. Workers used levers to rotate the turbine rotors, but manual cranking was time-consuming, labor-intensive, and extremely inefficient. Utility Model Content

[0004] The purpose of the utility model is to provide a low-speed auxiliary cranking device for improving the cranking efficiency and reducing the work intensity of the staff.

[0005] In order to solve the deficiencies of the above-mentioned technical problems, the technical solution adopted by the present invention is: a low-speed auxiliary winch device, comprising a U-shaped frame, a placement platform, a reduction motor and two arc-shaped clamping pieces, the opening of the U-shaped frame faces downward, the placement platform is arranged on the upper end surface of the horizontal part of the U-shaped frame, the upper end surface of the placement platform is provided with a cross bar parallel to the U-shaped frame, the cross bar is rotatably arranged, and two threaded sections with opposite rotation directions are provided on the cross bar, the two arc-shaped clamping pieces are arranged opposite to each other, and positioning blocks are provided on the outer arc sides, the two positioning blocks slide in contact with the placement platform and are respectively rotated on the two threaded sections, and the reduction motor is located between the two arc-shaped clamping pieces.

[0006] As a further optimization of the low-speed auxiliary turning device of the utility model, the upper end surface of the horizontal portion of the U-shaped frame is provided with a slide groove arranged along its longitudinal direction, the placement platform is located in the slide groove and slides along the longitudinal direction of the slide groove.

[0007] As a further optimization of the low-speed auxiliary turning device of the utility model, the side wall of the slide groove is provided with a guide rail arranged along its longitudinal direction, and the placement platform slide is arranged on the guide rail.

[0008] As a further optimization of the low-speed auxiliary winch device of the utility model, one end of the vertical portion of the U-shaped frame away from the horizontal portion is provided with a support plate for increasing the ground contact area.

[0009] As a further optimization of the low-speed auxiliary turning device of the utility model, elastic rubber sheets are provided in the arc-shaped clips.

[0010] As a further optimization of the low-speed auxiliary turning device of the utility model, the U-shaped frame is made of aluminum alloy.

[0011] As a further optimization of the low-speed auxiliary turning device of the utility model, the placement platform is provided with a fixed block, and one end of the cross bar is rotatably connected to the fixed block.

[0012] As a further optimization of the low-speed auxiliary turning device of the utility model, a positioning column is provided on the placement platform, and the positioning column is located between the two arc-shaped clips.

[0013] The utility model has the following beneficial effects: the utility model places the reduction motor at a certain height through the U-shaped frame, so that the reduction motor can be at the same height as the moving steam turbine rotor, the output shaft of the reduction motor is connected to the moving steam turbine rotor through a coupling, the reduction motor is started to drive the turbine rotor to rotate, thereby performing cranking, improving cranking efficiency, and reducing the intensity of staff, and at the same time, two relatively movable arc-shaped clamps are arranged on the placement table, and the reduction motor is fixed between the two arc-shaped clamps. When cranking, the two arc-shaped clamps clamp and fix the reduction motor, and when cranking is not needed, the reduction motor can be removed and used for other purposes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the low-speed auxiliary turning device of the utility model;

[0015] Reference numerals: 1. U-shaped frame, 2. guide rail, 3. slide groove, 4. arc-shaped clip, 5. reduction motor, 6. positioning block, 7. fixing block, 8. cross bar, 9. support plate, 10. placement table, 11. positioning column. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0017] like Figure 1As shown, the present invention provides a low-speed auxiliary cranking device for cranking, improving cranking efficiency and reducing the workload of operators. The cranking device provided by the present invention includes a reduction motor 5 that can be transmission-connected to the turbine rotor via a coupling, and a U-shaped frame 1 made of aluminum alloy. The opening of the U-shaped frame 1 faces downward, and the reduction motor 5 is arranged on the upper end surface of the horizontal portion of the U-shaped frame 1. The U-shaped frame 1 positions the reduction motor 5 at a certain height, thereby enabling the reduction motor 5 to be at the same height as the moving turbine rotor. The output shaft of the reduction motor 5 is transmission-connected to the moving turbine rotor via a coupling. When the reduction motor 5 is started, it drives the turbine rotor to rotate, thereby performing cranking.

[0018] In this embodiment, a placement platform 10 and two arc-shaped clips 4 are provided on the upper end surface of the horizontal portion of the U-shaped frame 1. The placement platform 10 is provided with a crossbar 8 parallel to the U-shaped frame 1. The placement platform 10 is provided with a fixed block 7. One end of the crossbar 8 is rotatably connected to the fixed block 7, thereby enabling horizontal rotation. The crossbar 8 is provided with two threaded sections with opposite rotation directions. The two arc-shaped clips 4 are arranged opposite each other, and each has a positioning block 6 on the outer arc side. The two positioning blocks 6 slide in contact with the placement platform 10 and are respectively screwed onto the two threaded sections of the crossbar 8. The reduction motor 5 is located between the two arc-shaped clips 4. By controlling the rotation of the crossbar 8, the spacing between the two arc-shaped clips 4 can be changed. When the motor is turning, the two arc-shaped clips 4 clamp and fix the reduction motor 5. When the motor is not turning, the reduction motor 5 can be removed and used for other purposes. In this embodiment, the arc-shaped clips 4 are each provided with an elastic rubber to reduce the clamping pressure of the arc-shaped clips 4.

[0019] In the embodiment, the upper end surface of the horizontal part of the U-shaped frame 1 is provided with a slide groove 3 arranged along its longitudinal direction, and the side wall of the slide groove 3 is provided with a guide rail 2 arranged along its longitudinal direction. The placement table 10 is slid on the guide rail 2, and the placement table 10 slides longitudinally, which can adjust the position of the reduction motor 5 without requiring the U-shaped frame 1 to be placed too precisely.

[0020] In this embodiment, a support plate 9 is provided at one end of the vertical portion of the U-shaped frame 1 away from the horizontal portion to increase the ground contact area.

[0021] In this embodiment, the placement platform 10 is provided with a positioning column 11, which is located between the two arc-shaped clips 4. The positioning column 11 is used to support the reduction motor 5, determine the initial position of the reduction motor 5, and facilitate clamping and fixing the reduction motor 5.

[0022] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A low-speed auxiliary turning device, characterized in that: The invention comprises a U-shaped frame (1), a placement table (10), a reduction motor (5) and two arc-shaped clips (4), wherein the opening of the U-shaped frame (1) faces downward, the placement table (10) is arranged on the upper end surface of the horizontal portion of the U-shaped frame (1), the upper end surface of the placement table (10) is provided with a cross bar (8) parallel to the horizontal portion of the U-shaped frame (1), the cross bar (8) is rotatably arranged, and the cross bar (8) is provided with two threaded sections with opposite rotation directions, the two arc-shaped clips (4) are arranged opposite to each other, and the outer arc sides are both provided with positioning blocks (6), the two positioning blocks (6) are fitted and slid with the placement table (10) and are respectively arranged on the two threaded sections, and the reduction motor (5) is located between the two arc-shaped clips (4).

2. The low-speed auxiliary barring device according to claim 1, characterized in that: The upper end surface of the horizontal portion of the U-shaped frame (1) is provided with a slide groove (3) arranged along its longitudinal direction, and the placement platform (10) is slidably arranged in the slide groove (3).

3. The low-speed auxiliary barring device according to claim 2, characterized in that: The side wall of the slide groove (3) is provided with a guide rail (2) arranged along its longitudinal direction, and the placement platform (10) is slidably arranged on the guide rail (2).

4. The low-speed auxiliary barring device according to claim 1, characterized in that: The end of the vertical portion of the U-shaped frame (1) away from the horizontal portion is provided with a support plate (9) for increasing the ground contact area.

5. The low-speed auxiliary barring device according to claim 1, characterized in that: Elastic films are provided in the arc-shaped clips (4).

6. The low-speed auxiliary barring device according to claim 1, characterized in that: The U-shaped frame (1) is made of aluminum alloy.

7. The low-speed auxiliary barring device according to claim 1, characterized in that: The placement platform (10) is provided with a fixed block (7), and one end of the crossbar (8) is rotatably connected to the fixed block (7).

8. The low-speed auxiliary barring device according to claim 1, characterized in that: A positioning column (11) is provided on the placement platform (10), and the positioning column (11) is located between the two arc-shaped clips (4).

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