Hoisting tool for inner valve cover of high-pressure main throttle valve of steam turbine

Abstract

The utility model discloses a steam turbine high-pressure main throttle valve inner valve cover lifting tool which comprises a lifting frame, the bottom of the lifting frame is connected with an adjusting frame through a connecting block, a positive and negative tooth lead screw is rotationally connected in the adjusting frame, a motor is arranged on one side of the surface of the adjusting frame, and the surface of the positive and negative tooth lead screw is in transmission connection with two sets of moving blocks through lead screw nuts. The bottom of the movable block movably penetrates through an open groove in the surface of the adjusting frame and then is connected with a lifting hook, an anti-disengaging assembly is arranged on the surface of the lifting hook, push blocks on the surfaces of the two inserting rods slide to drive the inserting rods to move towards the interior of the rotating shell, and therefore an opening in the surface of the lifting hook is opened; and the spring rebounds to drive the inserting rod to move towards one end close to the inserting groove and to be inserted into the inserting groove, so that the opening of the lifting hook is closed through the inserting rod, the lifting rope is prevented from falling off from the lifting hook due to factors such as vibration and impact in the lifting process, and the safety during lifting operation is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hoists for repairing an inner valve cover of a steam turbine, in particular to a hoisting tool for an inner valve cover of a high-pressure main steam valve of a steam turbine. Background Art

[0002] The high-pressure main steam valve is a protective device used by the steam turbine to quickly cut off the steam supply and shut down. It mainly uses pressure oil to control rapid closing and opening, and the closing time is less than 0.8 seconds; the regulating valve is a valve that controls the speed and output power of the steam turbine. The speed and power are controlled by changing the amount of steam entering the steam turbine. The inner valve cover is an important component of the main steam valve and the regulating valve. During the actual application of the steam turbine, the inner valve cover needs to be hoisted by a hanger, and the inner valve cover needs to be lifted for installation, or lifted out of the valve body for disassembly and maintenance.

[0003] Currently, when hoisting the inner valve cover, it is necessary to use a crane and a hanger to lift the inner valve cover. Since the inner valve cover is relatively heavy when hoisted, during the hoisting process, if the inner valve cover is not perpendicular to the lifting sling or a collision occurs during the hoisting, the inner valve cover will shake violently after it leaves the ground. The shaking may cause the lifting rope that lifts the inner valve cover to jump out of the hook, causing the lifting rope to slide and become unhooked due to external force, causing the lifting rope to slip, thereby causing the inner valve cover to fall off, posing a major safety hazard. Utility Model Content

[0004] The purpose of the utility model is to provide a tool for hoisting the inner valve cover of a high-pressure main steam valve of a steam turbine, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a tool for hoisting the inner valve cover of a high-pressure main steam valve of a steam turbine, comprising:

[0006] The hanger is connected to an adjusting frame through a connecting block at the bottom of the hanger, and a positive and negative screw rod is rotatably connected to the adjusting frame. A motor is provided on one side of the surface of the adjusting frame, and the output shaft of the motor rotates and passes through the adjusting frame and is connected to the positive and negative screw rods. The surfaces of the positive and negative screw rods are connected with two sets of moving blocks through a screw nut. The bottom of the moving block movably passes through the slot on the surface of the adjusting frame and is connected to a hook for lifting the inner valve cover. The surface of the hook is provided with an anti-slip component for preventing the lifting rope from slipping and unhooking when lifting the valve cover. The insertion rod of the anti-slip component is inserted into the slot provided on the surface of the hook, so that the insertion rod closes the opening of the hook to prevent the lifting rope from slipping and unhooking from the opening.

[0007] Preferably, the anti-slip assembly includes a rotating shell and a spring, the rotating shell is rotatably connected to the surface of the hook and the insertion rod is slidably connected to the rotating shell, the spring is arranged in the rotating shell and the two ends of the spring are respectively connected to the rotating shell and the insertion rod, the surface of the insertion rod is connected to a push block and the other end of the push block slides through the slot provided on the surface of the rotating shell.

[0008] Preferably, an elastic rope is connected to the surface of the rotating shell and the other end of the elastic rope is connected to a pin, and the pin is movable through the rotating shell and then plugged into the pin hole on the surface of the insertion rod.

[0009] Preferably, two sets of electric slide rails are provided in the hanger and counterweight blocks are connected to the surfaces of the electric slide rails. A plurality of balls are rollingly connected to the bottom of the counterweight blocks and the balls are in contact with the hanger.

[0010] Preferably, the top of the moving block is slidably connected to a sliding groove provided in the adjustment frame through a slider.

[0011] Preferably, both sides of the top of the hanger are connected with lifting blocks through chains.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] (1) By sliding the push blocks on the surfaces of the two sets of plug rods, the push blocks drive the plug rods to move into the rotating shell, thereby opening the opening on the surface of the hook. Then, the lifting rope bound to the inner valve cover can be hooked up by the hook, and the push blocks are released. The spring rebounds and drives the plug rod to move to the end close to the slot and insert it into the slot, thereby closing the opening of the hook by the plug rod to prevent the lifting rope from falling off from the hook due to vibration, impact and other factors during the lifting process, thereby greatly increasing the safety during the lifting operation.

[0014] (2) After the inner valve cover is hoisted by the hook, the electric slide rail can be controlled to work according to the balance of the hanger itself and the weight of the hoisted inner valve cover, so that the electric slide rail drives the two sets of counterweight blocks to move in the hanger. By moving the counterweight blocks, the load distribution at both ends of the hanger can be adjusted to ensure the uniform distribution of the load during the hoisting process, balance the weight at both ends of the hanger, and avoid tilting or instability of the hanger due to uneven weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 It is a cross-sectional view of the utility model;

[0017] Figure 3 This is a schematic structural diagram of the anti-slip assembly of the utility model;

[0018] Figure 4This is a schematic diagram of the structure of the utility model after the insertion rod and the slot are disconnected.

[0019] In the figure: 1. Hanger; 2. Connecting block; 3. Adjusting frame; 4. Forward and reverse screw rods; 5. Motor; 6. Moving block; 7. Hook; 8. Anti-slip assembly; 9. Insert rod; 10. Slot; 11. Opening; 12. Rotating shell; 13. Spring; 14. Elastic rope; 15. Pin; 16. Push block; 17. Slot; 18. Electric slide rail; 19. Counterweight; 20. Ball bearing; 21. Slider; 22. Chain; 23. Lifting block. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] The utility model provides Figure 1-4 A steam turbine high-pressure main steam valve inner bonnet lifting tool is shown, comprising:

[0022] The hanger 1 is connected to the adjusting frame 3 at the bottom through the connecting block 2, and the adjusting frame 3 is rotatably connected with the forward and reverse screw rods 4. A motor 5 is provided on one side of the surface of the adjusting frame 3, and the output shaft of the motor 5 rotates through the adjusting frame 3 and is connected with the forward and reverse screw rods 4. The surface of the forward and reverse screw rods 4 is connected with two groups of moving blocks 6 through the screw nut transmission. The bottom of the moving block 6 is movable through the slot on the surface of the adjusting frame 3 and is connected with the hook 7 for lifting the inner valve cover. The surface of the hook 7 is provided with an anti-slip component 8 for preventing the lifting rope from slipping and unhooking when lifting the valve cover. The insertion rod 9 of the anti-slip component 8 is inserted into the slot 10 provided on the surface of the hook 7, so that the insertion rod 9 closes the opening 11 of the hook 7 to prevent the lifting rope from slipping and unhooking from the opening 11.

[0023] The anti-slip assembly 8 includes a rotating shell 12 and a spring 13. The rotating shell 12 is rotatably connected to the surface of the hook 7 and the insertion rod 9 is slidably connected to the rotating shell 12. The spring 13 is arranged in the rotating shell 12 and the two ends of the spring 13 are respectively connected to the rotating shell 12 and the insertion rod 9. A push block 16 is connected to the surface of the insertion rod 9 and the other end of the push block 16 slides through the slot 17 provided on the surface of the rotating shell 12. By sliding the push block 16 in the slot 17 on the surface of the rotating shell 12, the push block 16 can drive the insertion rod 9 to move when it moves.

[0024] An elastic rope 14 is connected to the surface of the rotating shell 12 and a latch 15 is connected to the other end of the elastic rope 14. The latch 15 is movable through the rotating shell 12 and then plugged into the latch hole on the surface of the insertion rod 9 to limit the insertion rod 9.

[0025] The hanger 1 is provided with two sets of electric slide rails 18 and the surface of the electric slide rails 18 is connected to a counterweight block 19. The bottom of the counterweight block 19 is connected to a plurality of balls 20 in a rolling manner and the balls 20 are in contact with the hanger 1. When the electric slide rails 18 drive the counterweight block 19 to move, the balls 20 roll on the surface of the hanger 1, thereby reducing the friction resistance of the counterweight block 19 when it moves, making the movement of the counterweight block 19 on the electric slide rails 18 smoother and more stable.

[0026] The top of the moving block 6 is slidably connected to the slide groove provided in the adjustment frame 3 through the slider 21. When the moving block 6 moves, the top slides in the slide groove through the slider 21, thereby guiding the moving direction of the moving block 6, thereby enhancing the stability of the movement of the moving block 6.

[0027] Both sides of the top of the hanger 1 are connected with lifting blocks 23 through chains 22, and the hanger 1 can be lifted by connecting a crane to the lifting blocks 23.

[0028] The steam turbine high-pressure main steam valve inner valve cover lifting tool works by starting the motor 5, and the motor 5 drives the forward and reverse threaded rods 4 to rotate, thereby making the two sets of moving blocks 6 approach or move away from each other and driving the hook 7 to move. By adjusting the spacing between the two sets of moving blocks 6, inner valve covers of different sizes can be lifted. After adjustment, the push blocks 16 on the surfaces of the two sets of insertion rods 9 are slid, so that the push blocks 16 drive the insertion rods 9 to move into the rotating shell 12, thereby opening the opening 11 on the surface of the hook 7, and then the lifting rope bound to the inner valve cover can be hooked by the hook 7, and the push block 16 is released. The spring 13 rebounds and drives the insertion rod 9 to move to one end close to the slot 10 and insert it into the slot 10, thereby closing the opening 11 of the hook 7 through the insertion rod 9 to prevent the lifting rope from falling off from the hook 7 due to factors such as vibration and impact during the lifting process, thereby greatly increasing the safety during the lifting operation;

[0029] After the insertion rod 9 is inserted into the slot 10, the pin 15 can be inserted into the pin 15 hole on the surface of the insertion rod 9, thereby limiting the insertion rod 9 and preventing the insertion rod 9 from accidentally moving due to accidental touch when the insertion rod 9 closes the opening 11 of the hook 7. When the opening 11 needs to be opened, the pin 15 can be pulled out of the pin 15 hole in advance, thereby pushing the insertion rod 9 to move.

[0030] After the inner valve cover is hoisted by the hook 7, the electric slide 18 can be controlled to work according to the balance of the hanger 1 itself and the weight of the hoisted inner valve cover, so that the electric slide 18 drives the two sets of counterweight blocks 19 to move in the hanger 1. By moving the counterweight blocks 19, the load distribution at both ends of the hanger 1 can be adjusted to ensure the uniform distribution of the load during the hoisting process, balance the weight at both ends of the hanger 1, and avoid tilting or instability of the hanger 1 due to uneven weight.

[0031] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A steam turbine high-pressure main steam valve inner bonnet hoisting tool, characterized in that: include: A hanger (1) is provided, wherein the bottom of the hanger (1) is connected to an adjustment frame (3) through a connecting block (2), a forward and reverse threaded rod (4) is rotatably connected inside the adjustment frame (3), a motor (5) is provided on one side of the surface of the adjustment frame (3), an output shaft of the motor (5) rotates through the adjustment frame (3) and is connected to the forward and reverse threaded rod (4), the surface of the forward and reverse threaded rod (4) is connected to two groups of moving blocks (6) through a screw nut, the bottom of the moving block (6) is movably passed through the slot on the surface of the adjustment frame (3) and is connected to a hook (7) for hoisting an inner valve cover, the surface of the hook (7) is provided with an anti-slip component (8) for preventing a lifting rope from slipping off the hook when hoisting the valve cover, the insertion rod (9) of the anti-slip component (8) is inserted into a slot (10) provided on the surface of the hook (7), so that the insertion rod (9) closes the opening (11) of the hook (7) to prevent the lifting rope from slipping off the opening (11).

2. A steam turbine high-pressure main steam valve inner bonnet hoisting tool according to claim 1, characterized in that: The anti-slip assembly (8) comprises a rotating shell (12) and a spring (13). The rotating shell (12) is rotatably connected to the surface of the hook (7) and the insertion rod (9) is slidably connected to the rotating shell (12). The spring (13) is arranged in the rotating shell (12) and the two ends of the spring (13) are respectively connected to the rotating shell (12) and the insertion rod (9). The surface of the insertion rod (9) is connected to a push block (16) and the other end of the push block (16) slides through a slot (17) provided on the surface of the rotating shell (12).

3. A steam turbine high-pressure main steam valve inner bonnet hoisting tool according to claim 2, characterized in that: The surface of the rotating shell (12) is connected to an elastic rope (14), and the other end of the elastic rope (14) is connected to a latch (15). The latch (15) is movable through the rotating shell (12) and then plugged into a latch hole on the surface of the plug rod (9).

4. A steam turbine high-pressure main steam valve inner bonnet hoisting tool according to claim 1, characterized in that: Two sets of electric slide rails (18) are provided in the hanger (1), and the surfaces of the electric slide rails (18) are connected with counterweight blocks (19). The bottom of the counterweight blocks (19) are rollingly connected with a plurality of balls (20), and the balls (20) are in contact with the hanger (1).

5. The tool for hoisting the inner bonnet of a high-pressure main steam valve of a steam turbine according to claim 1, characterized in that: The top of the moving block (6) is slidably connected to a sliding groove provided in the adjustment frame (3) via a slider (21).

6. A steam turbine high-pressure main steam valve inner bonnet hoisting tool according to claim 1, characterized in that: Both sides of the top of the hanger (1) are connected with lifting blocks (23) via chains (22).

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