A steam turbine overhauling hoisting device for thermal power plant

Abstract

The utility model discloses a kind of thermal power plant steam turbine overhauling hoisting equipment, it is related to hoisting equipment technical field.The utility model includes rack, the top of rack is fixedly connected with hoisting assembly, the bottom of rack is fixedly connected with limiting component, the hoisting assembly includes the mounting bracket fixedly connected in the top of rack, the inner chamber of mounting bracket is fixedly connected with first winding roller by bearing.The utility model effectively solves the safety hazard that the lack of limiting structure of existing hoisting equipment leads to unstable center of gravity when steam turbine hoisting, easy to sway lateral tilt, limiting component engages with ratchet and pawl The engagement of cooperation can realize the one-way locking of second winding roller, cooperate the elastic support of spring, the length of second steel wire can be stably fixed, the side of steam turbine is limited and fixed by second hook, balance hoisting center of gravity, avoid to sway deviation in the process of rising, substantially improve the safety of hoisting process, guarantee staff life safety and equipment intact.

Description

Technical Field

[0001] This utility model belongs to the technical field of hoisting equipment, and in particular relates to a hoisting equipment for the maintenance of steam turbines in thermal power plants. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto the blades, causing the rotor, which is equipped with rows of blades, to rotate and perform work. During steam turbine maintenance, due to its large size, it needs to be lifted, which requires the use of hoisting equipment.

[0003] Chinese patent application CN223468121U discloses a hoisting device for the maintenance of steam turbines in thermal power plants, relating to the field of steam turbine maintenance technology. It includes a gantry-type mounting frame, with hoisting rope adjustment components movably connected to the upper left and right sides of the mounting frame. Hoisting adaptation components are fixedly installed at the left and right positions of the bottom of the hoisting rope adjustment components. This utility model describes a hoisting device for the maintenance of steam turbines in thermal power plants. Through the hoisting rope adjustment components, a co-rotating mechanism drives two rotating columns to rotate in the same direction, achieving the winding / unwinding of two hoisting ropes to hoist the steam turbine. Furthermore, the spacing adjustment mechanism can adjust the distance between the two moving frames, accommodating and hoisting steam turbines of different lengths. The hoisting adaptation components can adjust the length of the two steel ropes according to the different shapes of the steam turbine. The shorter section of the steel rope is connected to the protruding part of the steam turbine surface via a lifting ring, while the longer section of the steel rope is connected to the concave part of the steam turbine surface via a lifting ring.

[0004] Although this patented technology can lift steam turbines, it lacks a bottom limiting structure. During the lifting process, the turbine's center of gravity is unstable, causing it to sway. If the swaying is not addressed, it can easily lead to a tipping hazard and even endanger the lives of workers.

[0005] To address these issues, we provide a hoisting and maintenance equipment for steam turbines in thermal power plants. Utility Model Content

[0006] The purpose of this utility model is to provide a hoisting equipment for the maintenance of steam turbines in thermal power plants. Through the cooperation of hoisting components and limiting components, it solves the problem that in the prior art, the hoisting equipment does not have a limiting structure at the bottom. During the hoisting process, the steam turbine's center of gravity is unstable, causing swaying. If the swaying is not addressed, it can easily lead to the danger of tilting and even endanger the lives of workers.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0008] This utility model relates to a hoisting device for overhauling steam turbines in thermal power plants, comprising a frame, a hoisting assembly fixedly connected to the top of the frame, and a limit assembly fixedly connected to the bottom of the frame. The hoisting assembly includes a mounting frame fixedly connected to the top of the frame. A first take-up roller is fixedly connected to the inner cavity of the mounting frame via bearings. A servo motor is fixedly connected to one end of the first take-up roller. A drive gear is fixedly connected to the output shaft of the servo motor, located outside the mounting frame. A driven gear meshes with the surface of the drive gear. A reciprocating screw is fixedly connected to the surface of the driven gear. The reciprocating screw is fixedly connected to the mounting frame via bearings. A reciprocating block is threaded onto the surface of the reciprocating screw. The surface of the first take-up roller is wound with… The frame is equipped with a first steel wire wound around its end, which passes through the inner cavity of the reciprocating block and extends to the bottom of the frame. A first hook is fixedly connected to the bottom of the first steel wire. The limiting assembly includes a second take-up roller fixedly connected to the bottom of the frame via a bearing. A second steel wire is wound around the surface of the second take-up roller. A second hook is fixedly connected to the end of the second steel wire. Both ends of the second take-up roller are fixedly connected to ratchet wheels. A pawl engages on one side of the ratchet wheel. A fixed frame is movably connected to the other end of the pawl via a pin. A spring is fixedly connected to the top of the pawl. The other end of the spring is fixedly connected to the fixed frame. A screw is fixedly connected to the other side of the fixed frame via a bearing. The screw is threadedly connected to the frame.

[0009] The present invention is further configured such that the hoisting assembly includes a locking disc disposed on the side of the first take-up roller away from the servo motor, and a hydraulic telescopic rod is fixedly connected to the surface of the locking disc. The other end of the hydraulic telescopic rod is fixedly connected to the mounting frame through a mounting seat. The cooperative design of the locking disc and the hydraulic telescopic rod can lock and fix the first take-up roller during the hoisting process, preventing the turbine from falling due to accidental rotation of the first take-up roller, and further improving the safety protection performance of the hoisting equipment.

[0010] The present invention is further provided that the bottom of the frame is fixedly connected with casters, and reinforcing ribs are welded at the right angles of the frame. The casters facilitate the overall movement of the equipment and flexibly adapt to the usage needs of different maintenance positions. The reinforcing ribs at the right angles of the frame enhance the structural strength of the frame and improve the overall load-bearing capacity and stability of the equipment.

[0011] The present invention is further configured such that the inner wall of the frame is provided with a receiving groove for accommodating the fixing frame, and the inner wall of the receiving groove is provided with a threaded hole for use with a screw. The receiving groove provides installation space for the fixing frame, so that the fixing frame can be stored inside the frame.

[0012] The present invention is further configured such that a limiting rod is slidably connected to the bottom of the inner cavity of the reciprocating block, and the two ends of the limiting rod are fixedly connected to the mounting frame. The limiting rod guides and limits the movement of the reciprocating block, preventing the reciprocating block from rotating with the reciprocating screw, ensuring the stability of the lateral movement of the reciprocating block, and thus improving the accuracy of the first steel wire hoisting position adjustment.

[0013] The present invention is further provided with a handle at the front end of the second take-up roller, and the handle is fixedly connected to the second take-up roller. The handle allows the operator to manually rotate the second take-up roller to facilitate the winding of the second steel wire.

[0014] The present invention is further configured such that a handwheel is fixedly connected to one end of the screw located outside the frame. The handwheel provides an easy point of force for the operator to rotate the screw, making it easy to adjust the position of the fixed frame.

[0015] The present invention is further configured such that a circular hole is provided at the top of the frame for the first steel wire to pass through, the circular hole providing a passage for the first steel wire.

[0016] The present invention has the following beneficial effects.

[0017] 1. This utility model effectively solves the safety hazards of unstable center of gravity and easy swaying and tilting during the hoisting of steam turbines due to the lack of a limiting structure in existing hoisting equipment by adding a limiting component. The meshing cooperation of the ratchet and pawl in the limiting component can realize the one-way locking of the second winding roller. With the elastic support of the spring, the length of the second steel wire can be stably fixed. The side of the steam turbine is limited and fixed by the second hook, balancing the hoisting center of gravity and avoiding swaying and deviation during the ascent, which greatly improves the safety of the hoisting process and ensures the safety of the staff and the integrity of the equipment.

[0018] 2. In the hoisting assembly of this utility model, the servo motor synchronously drives the first winding roller and the reciprocating screw. The first winding roller realizes the lifting and hoisting of the steam turbine through the first steel wire and the first hook. The reciprocating screw drives the reciprocating block to move laterally, which can adjust the hoisting position of the first steel wire and ensure uniform hoisting force. The overall structure integrates hoisting and limiting functions, eliminating the need for additional limiting equipment, simplifying the operation process. The stable structural design of the frame and the coordinated cooperation of each component not only ensure the stability of the hoisting process, but also adapt to the maintenance and hoisting needs of steam turbines of different specifications, improving the efficiency of maintenance work. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a three-dimensional view of a steam turbine maintenance and hoisting equipment for thermal power plants.

[0021] Figure 2 This is a three-dimensional schematic diagram of a hoisting component in a steam turbine maintenance hoisting equipment for thermal power plants.

[0022] Figure 3 This is a side view schematic diagram of a hoisting component in a steam turbine maintenance hoisting equipment for thermal power plants.

[0023] Figure 4 This is a three-dimensional schematic diagram of a limit component in a steam turbine maintenance and hoisting equipment for thermal power plants.

[0024] Figure 5 This is a three-dimensional schematic diagram of the frame in a steam turbine maintenance and hoisting equipment for thermal power plants.

[0025] In the attached diagram: 1. Frame; 2. Lifting assembly; 21. Mounting frame; 22. First take-up roller; 23. Servo motor; 24. Drive gear; 25. Driven gear; 26. Reciprocating screw; 27. Reciprocating block; 28. First steel wire; 29. ​​First hook; 210. Locking disc; 211. Hydraulic telescopic rod; 212. Limiting rod; 3. Limiting assembly; 31. Second take-up roller; 32. Second steel wire; 33. Second hook; 34. Ratchet; 35. Pad; 36. Fixing frame; 37. Spring; 38. Screw; 39. Receiving groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Please see Figures 1-5This utility model relates to a hoisting device for overhauling steam turbines in thermal power plants. It includes a frame 1, a hoisting assembly 2 fixedly connected to the top of the frame 1, and a limit assembly 3 fixedly connected to the bottom of the frame 1. The hoisting assembly 2 includes a mounting frame 21 fixedly connected to the top of the frame 1. A first take-up roller 22 is fixedly connected to the inner cavity of the mounting frame 21 via bearings. A servo motor 23 is fixedly connected to one end of the first take-up roller 22. A drive gear 24 is fixedly connected to the output shaft of the servo motor 23, located outside the mounting frame 21. A driven gear 25 meshes with the surface of the drive gear 24. A reciprocating screw 26 is fixedly connected to the surface of the driven gear 25. The reciprocating screw 26 is fixedly connected to the mounting frame 21 via bearings. A reciprocating block 27 is threaded onto the surface of the reciprocating screw 26. A first take-up roller 22 is wound with a first... A steel wire 28 is provided, the end of which passes through the inner cavity of the reciprocating block 27 and extends to the bottom of the frame 1. A first hook 29 is fixedly connected to the bottom of the first steel wire 28. The limiting assembly 3 includes a second take-up roller 31 fixedly connected to the bottom of the frame 1 via a bearing. A second steel wire 32 is wound on the surface of the second take-up roller 31. A second hook 33 is fixedly connected to the end of the second steel wire 32. Ratchets 34 are fixedly connected to both the front and rear ends of the second take-up roller 31. A pawl 35 is engaged on one side of the ratchet 34. A fixed frame 36 is movably connected to the other end of the pawl 35 via a pin. A spring 37 is fixedly connected to the top of the pawl 35. The other end of the spring 37 is fixedly connected to the fixed frame 36. A screw 38 is fixedly connected to the other side of the fixed frame 36 via a bearing. The screw 38 is threadedly connected to the frame 1.

[0028] Specifically: The bottom of the servo motor 23 is fixedly connected to the frame 1 via a mounting base. The drive gear 24 rotates coaxially with the output shaft. The driven gear 25 is synchronously driven with the drive gear 24. The reciprocating screw 26 can rotate together with the driven gear 25. The reciprocating block 27 can move along the axial direction of the reciprocating screw 26. The pawl 35 and the ratchet 34 engage with each other to achieve one-way locking. The spring force of the spring 37 keeps the pawl 35 always engaged with the ratchet 34. The position of the fixed bracket 36 can be adjusted by rotating the screw 38, thereby releasing the locked state of the pawl 35 and the ratchet 34.

[0029] The hoisting assembly 2 also includes a locking disc 210 located on the side of the first take-up roller 22 away from the servo motor 23. A hydraulic telescopic rod 211 is fixedly connected to the surface of the locking disc 210. The other end of the hydraulic telescopic rod 211 is fixedly connected to the mounting frame 21 through a mounting base. The design of the locking disc 210 and the hydraulic telescopic rod 211 can lock and fix the first take-up roller 22 during hoisting, preventing the turbine from falling due to accidental rotation of the first take-up roller 22, and further improving the safety protection performance of the hoisting equipment.

[0030] The bottom of the frame 1 is fixedly connected with casters, and reinforcing ribs are welded at the right angles of the frame 1. The casters facilitate the overall movement of the equipment and flexibly adapt to the usage needs of different maintenance positions. The reinforcing ribs at the right angles of the frame 1 enhance the structural strength of the frame 1 and improve the overall load-bearing capacity and stability of the equipment.

[0031] The inner wall of the frame 1 is provided with a receiving groove 39 for accommodating the fixing bracket 36, and the inner wall of the receiving groove 39 is provided with a threaded hole for use with the screw 38. The receiving groove 39 provides installation space for the fixing bracket 36, so that the fixing bracket 36 can be stored inside the frame 1.

[0032] The bottom of the inner cavity of the reciprocating block 27 is slidably connected to a limit rod 212. The two ends of the limit rod 212 are fixedly connected to the mounting frame 21. The limit rod 212 guides and limits the movement of the reciprocating block 27, preventing the reciprocating block 27 from rotating with the reciprocating screw 26, ensuring the stability of the lateral movement of the reciprocating block 27, and thus improving the accuracy of the hoisting position adjustment of the first steel wire 28.

[0033] The front end of the second take-up roller 31 is provided with a handle, and the handle is fixedly connected to the second take-up roller 31. The handle allows the operator to manually rotate the second take-up roller 31 to easily wind up the second steel wire 32.

[0034] A handwheel is fixedly connected to one end of the screw 38 located outside the frame 1. The handwheel provides an easy point of force for the operator to turn the screw 38, making it easy to adjust the position of the fixed frame 36.

[0035] The top of the frame 1 has a circular hole for the first steel wire 28 to pass through, and the circular hole provides a passage for the first steel wire 28 to pass through.

[0036] The working principle of this utility model is as follows: First, the equipment is moved to a suitable maintenance position using the casters at the bottom of the frame 1. During the hoisting operation, the first hook 29 is attached to the hoisting point of the turbine. The servo motor 23 is started, which drives the first winding roller 22 and the drive gear 24 to rotate. The rotation of the first winding roller 22 realizes the winding and unwinding of the first steel wire 28, thereby driving the turbine to rise and fall. The drive gear 24 meshes with the driven gear 25 and rotates. The driven gear 25 drives the reciprocating screw 26 to rotate, causing the reciprocating block 27 to move along the reciprocating screw. The rod 26 moves laterally to adjust the hoisting position of the first steel wire 28, ensuring that the turbine is subjected to uniform force. At the same time, the second hook 33 is attached to the side of the turbine. The spring 37 pushes the pawl 35 to engage with the ratchet 34, restricting the second take-up roller 31 from reversing, thereby fixing the length of the second steel wire 32 and limiting the turbine to prevent swaying during hoisting. After hoisting is completed, the hydraulic telescopic rod 211 is extended to push the locking disc 210 to fit against the first take-up roller 22, thereby locking the first take-up roller 22 and ensuring the safety of the maintenance process.

[0037] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A hoisting and lifting device for overhauling steam turbines in thermal power plants, comprising a frame (1), characterized in that: The top of the frame (1) is fixedly connected to a hoisting assembly (2), and the bottom of the frame (1) is fixedly connected to a limiting assembly (3); The hoisting assembly (2) includes a mounting frame (21) fixedly connected to the top of the frame (1). A first take-up roller (22) is fixedly connected to the inner cavity of the mounting frame (21) via bearings. A servo motor (23) is fixedly connected to one end of the first take-up roller (22). A drive gear (24) is fixedly connected to the output shaft of the servo motor (23) and located outside the mounting frame (21). A driven gear (25) meshes with the surface of the drive gear (24). 25) has a reciprocating screw (26) fixedly connected to its surface. The reciprocating screw (26) is fixedly connected to the mounting bracket (21) via bearings. The surface of the reciprocating screw (26) is threaded with a reciprocating block (27). The surface of the first take-up roller (22) is wound with a first steel wire (28). The end of the first steel wire (28) passes through the inner cavity of the reciprocating block (27) and extends to the bottom of the frame (1). The bottom of the first steel wire (28) is fixedly connected with a first hook (29). The limiting assembly (3) includes a second take-up roller (31) fixedly connected to the bottom of the frame (1) by a bearing. The surface of the second take-up roller (31) is wound with a second steel wire (32). The end of the second steel wire (32) is fixedly connected with a second hook (33). Both the front and rear ends of the second take-up roller (31) are fixedly connected with ratchet wheels (34). One side of the ratchet wheel (34) is engaged with a pawl (35). The other end of the pawl (35) is movably connected to a fixing frame (36) by a pin. The top of the pawl (35) is fixedly connected with a spring (37). The other end of the spring (37) is fixedly connected to the fixing frame (36). The other side of the fixing frame (36) is fixedly connected with a screw (38) by a bearing. The screw (38) is threadedly connected to the frame (1).

2. The steam turbine overhaul and hoisting equipment for thermal power plants according to claim 1, characterized in that: The hoisting assembly (2) also includes a locking disc (210) located on the side of the first take-up roller (22) away from the servo motor (23). A hydraulic telescopic rod (211) is fixedly connected to the surface of the locking disc (210), and the other end of the hydraulic telescopic rod (211) is fixedly connected to the mounting frame (21) through a mounting seat.

3. The steam turbine overhaul and hoisting equipment for thermal power plants according to claim 1, characterized in that: The bottom of the frame (1) is fixedly connected with casters, and reinforcing ribs are welded at the right angles of the frame (1).

4. The steam turbine overhaul and hoisting equipment for thermal power plants according to claim 1, characterized in that: The inner wall of the frame (1) is provided with a receiving groove (39) for accommodating the fixing frame (36), and the inner wall of the receiving groove (39) is provided with a threaded hole for use with the screw (38).

5. The steam turbine overhaul and hoisting equipment for thermal power plants according to claim 1, characterized in that: The bottom of the inner cavity of the reciprocating block (27) is slidably connected to a limiting rod (212), and the two ends of the limiting rod (212) are fixedly connected to the mounting bracket (21).

6. The steam turbine overhaul and hoisting equipment for thermal power plants according to claim 1, characterized in that: The front end of the second take-up roller (31) is provided with a throttle, and the throttle is fixedly connected to the second take-up roller (31).

7. The steam turbine overhaul and hoisting equipment for thermal power plants according to claim 1, characterized in that: A handwheel is fixedly connected to one end of the screw (38) located outside the frame (1).

8. The steam turbine overhaul and hoisting equipment for thermal power plants according to claim 1, characterized in that: The top of the frame (1) has a circular hole for the first steel wire (28) to pass through.

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