Internal structure observation equipment for overhauling low-pressure cylinder of steam turbine of heavy water reactor nuclear power plant

Abstract

The utility model relates to the technical field of heavy water reactor nuclear power plant maintenance, and aims to solve the problems that a manual pushing and moving mode of a maintenance platform is labor-consuming and unstable in supporting. The utility model provides internal structure observation equipment for heavy water reactor nuclear power plant steam turbine low-pressure cylinder maintenance, which comprises a base and a maintenance platform, a driving wheel component is arranged at the lower end of the base, a hydraulic cylinder is arranged at the upper end of the base, the maintenance platform is mounted above the hydraulic cylinder, and a hollow pipe is arranged on the side of the base. One end of the movable pipe is connected with a fixed block, the upper end of the fixed block is in threaded connection with a screw rod, and the lower end of the screw rod is rotationally connected with a supporting block. The device can be conveniently moved and overhauled during overhauling, and the fixing block connected with the movable pipe can increase the bottom supporting area of the device when the device is stopped, so that the device is kept stable.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance of heavy water reactor nuclear power plants, in particular to an internal structure observation device for maintenance of a low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant. Background Art

[0002] In a heavy water reactor nuclear power plant, the low-pressure cylinder is similar to the high-pressure cylinder and the medium-pressure cylinder, and is an important part of the steam turbine. When the steam turbine converts the thermal energy of high-temperature steam into high-speed rotating mechanical energy and drives the generator to cut the magnetic lines of force and convert them into electrical energy, the steam has to do work, and the pressure must be reduced and the volume expanded, so it expands from high pressure to medium pressure\low pressure. The high pressure, medium pressure, and low pressure are distributed in three cylinders, namely the high pressure cylinder, medium pressure cylinder, and low pressure cylinder.

[0003] At present, when inspecting the low-pressure cylinder, personnel are generally required to stand on the inspection platform and raise the inspection platform to observe the internal structure of the low-pressure cylinder. When inspecting and observing the low-pressure cylinder, the existing inspection platform usually needs to be manually pushed to move it to the appropriate position, which is laborious and the support is unstable. Utility Model Content

[0004] The utility model aims to provide an internal structure observation device for the maintenance of a low-pressure cylinder of a steam turbine in a heavy water reactor nuclear power plant, which solves the problem that the manual moving mode of the existing maintenance platform is laborious and the support is unstable.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An internal structure observation device for the maintenance of a low-pressure cylinder of a steam turbine in a heavy water reactor nuclear power plant comprises a base and a maintenance platform, wherein a driving wheel assembly is provided at the lower end of the base, a hydraulic cylinder is provided at the upper end of the base, the maintenance platform is arranged above the hydraulic cylinder, a hollow tube is provided at the side of the base, a movable tube is slidably connected inside the hollow tube, one end of the movable tube is connected to a fixed block, a screw is threadedly connected to the upper end of the fixed block, and a support block is rotatably connected to the lower end of the screw.

[0007] As an practicable manner, the driving wheel assembly includes a groove opened at the bottom of the base, an L-shaped plate is connected to the inside of the groove, a motor is installed at one end of the L-shaped plate, a rotating shaft is connected to the output end of the motor, one end of the rotating shaft extends to the outside of the groove and is connected to a small gear, the two sides of the small gear are respectively meshed and connected to the first large gear and the second large gear, one end of the first large gear and the second large gear are rotatably connected to the L-shaped plate, and the other end of the first large gear and the second large gear is connected to a moving wheel.

[0008] As an implementable manner, the diameter of the moving wheel is larger than the diameters of the first large gear and the second large gear.

[0009] As an implementable manner, the upper ends of the hollow tube and the movable tube are both provided with fixing holes for connecting adjusting bolts.

[0010] As an implementable manner, a handle is provided at the upper end of the screw rod.

[0011] As an implementable method, ladders are connected to both sides of the upper end of the base, a positioning plate is connected to one side of the upper part of the ladder, a guide rod is connected through the upper end of the positioning plate, and the upper end of the guide rod is connected to the lower end of the maintenance platform.

[0012] As an implementable manner, the upper end of the hydraulic cylinder is connected to a mounting plate, and the inspection platform is mounted on the upper end of the mounting plate.

[0013] As an implementable manner, the hollow tube and the movable tube are both square tube structures.

[0014] As an implementable manner, the maintenance platform includes a standing board, and the upper surface of the standing board is evenly arranged with anti-slip ridges.

[0015] As an implementable manner, the hollow tubes are provided around the base.

[0016] Compared with the prior art, the internal structure observation device for the maintenance of the low-pressure cylinder of the steam turbine of a heavy water reactor nuclear power plant provided by the utility model has the following beneficial effects:

[0017] The internal structure observation device provided by the utility model can be conveniently moved for maintenance during maintenance, which saves labor and maintenance time. When arriving at a designated position, the device can be kept stable by means of support blocks, which facilitates observation.

[0018] The utility model is provided with a hollow tube, a movable tube, an adjusting bolt, a fixed block, a screw rod, a support block and a handle. When the device is moved to an appropriate position, the movable tube is extended outward along the inside of the hollow tube and then fixed under the action of the adjusting bolt. Then, the handle is rotated to drive the screw rod to rotate, so that the screw rod drives the support block to contact and support the ground. Through the above structure, the movable tube can increase its bottom support area when the device stops, so that the device remains stable and has good firmness.

[0019] Furthermore, the utility model sets a driving wheel assembly, and the motor drives the small gear to mesh with the first large gear and the second large gear, so that the first large gear and the second large gear rotate in the same direction, thereby driving the two moving wheels to rotate, so that the equipment moves, thereby reducing the phenomenon of people pushing the equipment when moving, and making the equipment easy to move. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present utility model, the following is a brief introduction to the drawings required for the description.

[0021] Figure 1 A schematic diagram of the structure of the internal structure observation device for the maintenance of the low-pressure cylinder of a steam turbine in a heavy water reactor nuclear power plant provided by the utility model;

[0022] Figure 2 A side view of the internal structure observation device for inspecting the low-pressure cylinder of a steam turbine in a heavy water reactor nuclear power plant provided by the utility model;

[0023] Figure 3 A bottom view of the internal structure observation device for inspecting the low-pressure cylinder of a steam turbine in a heavy water reactor nuclear power plant provided by the utility model;

[0024] Figure 4 This is a schematic structural diagram of the driving wheel assembly provided by the utility model.

[0025] Description of reference numerals:

[0026] 1. Base; 2. Driving wheel assembly; 3. Hydraulic cylinder; 4. Maintenance platform; 5. Ladder; 6. Positioning plate; 7. Guide rod; 8. Hollow tube; 9. Movable tube; 10. Adjusting bolt; 11. Fixing block; 12. Screw; 13. Support block; 14. Handle;

[0027] 201, groove; 202, L-shaped plate; 203, motor; 204, rotating shaft; 205, small gear; 206, first large gear; 207, second large gear; 208, connecting shaft; 209, moving wheel. DETAILED DESCRIPTION

[0028] The following is further explained in detail through specific implementation methods.

[0029] like Figures 1 to 4 As shown, the utility model provides an internal structure observation device for the maintenance of the low-pressure cylinder of a steam turbine in a heavy water reactor nuclear power plant, and the main body includes a base 1 and a maintenance platform 4. The four corners of the lower end of the base 1 are equipped with a driving wheel assembly 2, the middle of the upper end of the base 1 is connected to a hydraulic cylinder 3, and the upper end of the hydraulic cylinder 3 is connected to the maintenance platform 4. The maintenance platform 4 includes a standing board and a fence, and the upper surface of the standing board is evenly connected with anti-skid convex ridges, which is convenient for personnel to prevent slipping when standing for observation.

[0030] Preferably, the upper end of the hydraulic cylinder 3 is connected to a mounting plate, and the inspection platform 4 is mounted on the upper end of the mounting plate.

[0031] Preferably, ladders 5 are connected to both sides of the upper end of the base 1, a positioning plate 6 is connected to one side of the upper part of the ladder 5, a guide rod 7 is connected through the upper end of the positioning plate 6, and the upper end of the guide rod 7 is connected to the lower end of the maintenance platform 4. Through the cooperation between the guide rod 7 and the positioning plate 6, the maintenance platform 4 can remain stable during the lifting process.

[0032] The base 1 is connected with hollow tubes 8 on all sides, and a movable tube 9 is slidably connected inside the hollow tube 8. The movable tube 9 and the hollow tube 8 are connected by an adjusting bolt 10. One end of the movable tube 9 is connected with a fixed block 11, and the upper end of the fixed block 11 is threadedly connected with a screw rod 12, and the lower end of the screw rod 12 is rotatably connected with a support block 13, and the upper end of the screw rod 12 is connected with a handle 14. The hollow tube 8 and the movable tube 9 are both square tube structures, and the upper ends of the hollow tube 8 and the movable tube 9 are provided with fixing holes for facilitating the connection of the adjusting bolt 10.

[0033] The base 1 is driven to move by the driving wheel assembly 2. When it moves to the appropriate position, the movable tube 9 is extended outward along the inside of the hollow tube 8 by loosening the adjusting bolt 10, and then the movable tube 9 is fixed by tightening the adjusting bolt 10. Then, the screw rod 12 is driven to rotate by turning the handle 14, so that the screw rod 12 gradually moves downward, and then the support block 13 contacts and supports the ground to keep the equipment stable. Then, the hydraulic cylinder 3 is extended and lifted, so that the maintenance platform 4 is gradually raised, and then the personnel are raised for convenient observation.

[0034] like Figure 4 As shown, the driving wheel assembly 2 includes a groove 201 opened at the lower end of the base 1, an L-shaped plate 202 is connected inside the groove 201, a motor 203 is installed at one end of the L-shaped plate 202, a rotating shaft 204 is connected to the output end of the motor 203, one end of the rotating shaft 204 extends to the outside of the groove 201 and is connected to a pinion 205, the two sides of the pinion 205 are respectively meshed and connected to the first large gear 206 and the second large gear 207, one end (inner end) of the first large gear 206 and the second large gear 207 are both rotatably connected to the L-shaped plate 202 through a connecting shaft 208, and the other end (outer end) of the first large gear 206 and the second large gear 207 is connected to a moving wheel 209, and the connecting ends of the rotating shaft 204 and the connecting shaft 208 are both provided with connecting holes relative to the groove 201 and one end of the L-shaped plate 202, and a bearing is embedded in the connecting hole. The diameter of the two moving wheels 209 is larger than the diameter of the first large gear 206 and the second large gear 207.

[0035] The motor 203 drives the small gear 205 to rotate, so that the first large gear 206 and the second large gear 207 are meshed and transmitted therewith, so that the first large gear 206 and the second large gear 207 rotate in the same direction, thereby driving the two moving wheels 209 to rotate, so that the equipment moves, which can reduce the labor of personnel when moving the equipment and make the equipment move more convenient.

[0036] The working principle of the utility model is as follows:

[0037] When in use, the base 1 is driven to move by the driving wheel assembly 2. When the motor 203 rotates forward, the motor 203 drives the small gear 205 to rotate forward, so that the first large gear 206 and the second large gear 207 are meshed and transmitted therewith. At this time, the first large gear 206 and the second large gear 207 both rotate in the opposite direction, thereby driving the two moving wheels 209 to rotate in the opposite direction, so that the device can move backward. Conversely, when the motor 203 rotates in the opposite direction, the moving wheel 209 drives the device forward, thereby reducing the effort of people pushing the device when moving, making the device move more convenient.

[0038] After moving to the appropriate position, the movable tube 9 is extended outward along the inside of the hollow tube 8 by loosening the adjusting bolt 10, and then the movable tube 9 is fixed by tightening the adjusting bolt 10. Then, the screw rod 12 is driven to rotate by turning the handle 14, so that the screw rod 12 gradually moves downward, and then the support block 13 contacts and supports the ground to keep the equipment stable. Then, the hydraulic cylinder 3 is extended and lifted, so that the maintenance platform 4 is gradually raised, and then the personnel are raised for convenient observation.

[0039] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. An internal structure observation device for the maintenance of a low-pressure cylinder of a steam turbine in a heavy water reactor nuclear power plant, comprising a base (1) and a maintenance platform (4), characterized in that: A driving wheel assembly (2) is provided at the lower end of the base (1), a hydraulic cylinder (3) is provided at the upper end of the base (1), the inspection platform (4) is arranged above the hydraulic cylinder (3), a hollow tube (8) is provided at the side of the base (1), a movable tube (9) is slidably connected inside the hollow tube (8), one end of the movable tube (9) is connected to a fixed block (11), the upper end of the fixed block (11) is threadedly connected to a screw rod (12), and the lower end of the screw rod (12) is rotatably connected to a support block (13).

2. The internal structure observation equipment for the maintenance of the low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant according to claim 1 is characterized in that: The driving wheel assembly (2) comprises a groove (201) provided at the bottom of the base (1); an L-shaped plate (202) is connected inside the groove (201); a motor (203) is installed at one end of the L-shaped plate (202); a rotating shaft (204) is connected to the output end of the motor (203); one end of the rotating shaft (204) extends to the outside of the groove (201) and is connected to a pinion (205); two sides of the pinion (205) are respectively meshed with a first large gear (206) and a second large gear (207); one end of the first large gear (206) and the second large gear (207) are rotatably connected to the L-shaped plate (202); and the other ends of the first large gear (206) and the second large gear (207) are connected to a moving wheel (209).

3. The internal structure observation equipment for the maintenance of the low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant according to claim 2 is characterized in that: The diameter of the moving wheel (209) is larger than the diameters of the first large gear (206) and the second large gear (207).

4. The internal structure observation equipment for the maintenance of the low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant according to claim 1, characterized in that: The upper ends of the hollow tube (8) and the movable tube (9) are both provided with fixing holes for connecting the adjusting bolts (10).

5. The internal structure observation equipment for the maintenance of the low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant according to claim 1, characterized in that: A handle (14) is provided at the upper end of the screw rod (12).

6. The internal structure observation equipment for the maintenance of the low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant according to claim 1, characterized in that: Both sides of the upper end of the base (1) are connected to ladders (5), one side of the upper part of the ladder (5) is connected to a positioning plate (6), the upper end of the positioning plate (6) is penetrated by a guide rod (7), and the upper end of the guide rod (7) is connected to the lower end of the maintenance platform (4).

7. The internal structure observation equipment for the maintenance of the low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant according to claim 1, characterized in that: The upper end of the hydraulic cylinder (3) is connected to a mounting plate, and the inspection platform (4) is mounted on the upper end of the mounting plate.

8. The internal structure observation equipment for the maintenance of the low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant according to claim 1, characterized in that: The hollow tube (8) and the movable tube (9) are both square tube structures.

9. The internal structure observation equipment for the maintenance of the low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant according to claim 1, characterized in that: The maintenance platform (4) comprises a standing board, and the upper surface of the standing board is evenly arranged with anti-slip ridges.

10. The internal structure observation equipment for the maintenance of the low-pressure cylinder of a steam turbine of a heavy water reactor nuclear power plant according to claim 1, characterized in that: The hollow tubes (8) are arranged around the base (1).

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