Rail car for overhauling nuclear main pump

Abstract

The utility model provides a rail car for overhauling a nuclear main pump. The rail car comprises two rails which are oppositely arranged, tackles which can move on the respective rails, a pump shell connecting frame, two speed reducing mechanisms which are respectively arranged on the respective tackles, and a hoisting mechanism, the pump shell connecting frames are arranged on the respective rails and are used for mounting the whole rail car for overhauling on a main pump motor support; each speed reducing mechanism comprises a closed speed reducer, a speed reducer connecting plate is connected between the two speed reducers, the hoisting mechanism comprises a hoisting belt, and the speed reducers drive the hoisting belt to do hoisting motion.

Description

Technical Field

[0001] The utility model relates to the field of nuclear power, and more specifically, to an orbiting vehicle for overhauling a nuclear main pump. Background Art

[0002] Due to the special mechanical design structure of the main pump in a nuclear power plant and the environmental restrictions of the nuclear island building, during the overhaul of the main pump, the removal and installation of components such as the main pump back coupling, intermediate short section, three mechanical seals, main pump seal chamber, and main pump bearings must rely on special tools to remove the above-mentioned equipment from the inner side of the pump chamber (motor support) and move it out through the manhole door of the motor support for storage, overhaul, and maintenance outside the motor support. Currently, for the pump-side overhaul work of the CPR1000 type main pump, the imported main pump trolley from abroad is used for the installation and disassembly of bearings and shaft seals. The main pump trolley is a key bottleneck tool for the overhaul of the main pump, with characteristics such as high frequency of tool application and extremely high requirements for tool reliability.

[0003] A certain domestic nuclear power company has 6 units with a total of 18 main pumps. On average, 12 main pump overhaul operations per year require the use of the main pump trolley, with a high frequency of use. The design concept of the imported trolleys purchased by each base still follows the design and manufacturing plan of the last century. At the same time, the purchase price of the imported trolleys is high, and the procurement cycle is about 20 months. All existing main pump trolleys are designed and produced by imitating the original French factory and have not been improved. There are problems such as unstable reduction mechanisms of the left and right trolleys, and the worm wheels and friction discs are exposed outside. The worm gears and friction discs are easily worn and chipped, resulting in metal debris entering the inner side of precision components such as the main pump chamber or shaft seal, leading to serious accidents. In addition, the original trolley also has defects such as poor trolley stability, too large equipment weight, inconvenient handling, difficult assembly in a limited space, cumbersome operation of the reduction mechanism, and troublesome replacement and installation of slings, which seriously restricts the intrinsic safety of the main pump overhaul personnel, hinders the improvement of the reliability of the overhaul quality, and causes the main pump overhaul personnel to be exposed to a relatively high radiation dose level. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an orbiting vehicle for overhauling a nuclear main pump, which is particularly suitable for the overhaul work of the main pump in a nuclear power plant, in view of the above-mentioned defects of the prior art. The orbiting vehicle includes two relatively arranged tracks, a trolley capable of moving on the tracks, a track connecting rod, a pump housing connecting frame, a reduction mechanism, and a hoisting mechanism. Through a unique design, the orbiting vehicle of the utility model can be conveniently moved and positioned, and at the same time, the equipped hoisting mechanism can easily hoist and move the main pump, greatly improving the overhaul efficiency.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A rail vehicle for overhauling a nuclear main pump, comprising two oppositely arranged rails, a trolley capable of moving on its respective rail, a pump housing connecting frame, two speed reduction mechanisms respectively arranged on their respective trolleys, and a hoisting mechanism;

[0007] The pump housing connecting frame is arranged on its respective rail for installing the entire overhaul rail vehicle on the main pump motor support;

[0008] Each of the speed reduction mechanisms includes an enclosed speed reducer. A speed reducer connecting plate is connected between the two speed reducers. The hoisting mechanism includes a sling, and the speed reducer drives the sling to perform a hoisting motion.

[0009] Further, preferably, the hoisting mechanism includes a sling pulley assembly and a rope winding wheel assembly. The rope winding wheel assembly is key-connected to the main wheel shaft of the speed reducer, and one end of the sling is fixed to the rope winding wheel assembly through the sling pulley assembly.

[0010] Further, preferably, the trolley includes a vehicle body arranged oppositely and track wheels arranged between the two vehicle bodies. The trolley is connected to its respective rail through the track wheels.

[0011] Further, preferably, the trolley further includes a reinforcing shaft assembly that transversely connects the two vehicle bodies.

[0012] Further, preferably, the track wheels are T-shaped track wheels, the rails are I-shaped rails, and the T-shaped track wheels are arranged in groups.

[0013] Further, preferably, a trolley locking device is arranged on the trolley. The trolley locking device includes a locking handle and a locking part connected to the locking handle. Tightening the locking handle can make the locking part have a radial protrusion amount relative to the trolley, and generate a frictional force when contacting the rail, thereby fixing the position of the trolley on the rail.

[0014] Further, preferably, the end of the locking part is coated with a rubber sleeve.

[0015] Further, preferably, the overhaul rail vehicle includes a ratchet wrench for driving the speed reducer. A connecting rod coaxial with the main shaft wheel of the speed reducer is connected to the speed reducer, and the ratchet wrench is connected to the connecting rod; and / or, the overhaul rail vehicle includes a motor for driving the speed reducer.

[0016] Further, preferably, the speed reduction mechanism includes a fixed flange, the trolley includes a vehicle body, and the speed reducer is fixed to the vehicle body through the fixed flange.

[0017] Furthermore, it is preferable that the maintenance rail car includes a rail connecting rod, which is detachably connected between two trolleys. The trolleys can move freely on the rails. By connecting with the rail connecting rod, the synchronism and stability of the movement are ensured.

[0018] The rail car for the maintenance of the nuclear main pump of the present utility model has the following advantages and effects:

[0019] 1. Through a unique design, the easy hoisting and movement of the main pump are realized, greatly improving the maintenance efficiency;

[0020] 2. The design of the trolleys enables them to move freely on the rails, and the movement is stable and reliable;

[0021] 3. The design of the hoisting mechanism makes the winching movement of the sling more stable and reliable, and it can be conveniently driven manually;

[0022] 4. The design of the trolley locking device can conveniently fix the position of the trolley to prevent its accidental movement;

[0023] 5. The overall structure is simple and compact, facilitating transportation and storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a top view of the installation state of the rail car for the maintenance of the nuclear main pump of the present utility model;

[0025] Figure 2 is a side view of the installation state of the rail car for the maintenance of the nuclear main pump of the present utility model;

[0026] Figure 3 is a schematic structural diagram of the trolley of the present utility model;

[0027] Figure 4 is a schematic diagram of the partial structure of a single trolley of the present utility model;

[0028] Figure 5 is a top view of a single trolley of the present utility model;

[0029] Figure 6 is Figure 5 a partially enlarged schematic diagram of the circled part in

[0030] Figure 7 is a schematic structural diagram of the rail of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To further elaborate on the technical means and technical effects of the present utility model, the following describes the preferred embodiments of the present utility model in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0032] As Figures 1-7 shown, a rail vehicle for nuclear main pump maintenance provided by the present utility model includes two relatively arranged rails 10, sliders 20 capable of moving on their respective rails 10, a pump housing connecting frame 30, two deceleration mechanisms 40 respectively arranged on their respective sliders 20, and a hoisting mechanism 50. Taking the rails 10 as a bridge and the two sliders 20 as lifting supports. The material of the rails 10 can be made of titanium alloy with good strength and rigidity, which is machined after welding, effectively improving the requirements for rail stiffness and straightness, ensuring better quality requirements for the working surface, and the new material rails 10 achieve a two-way improvement in the wear resistance and surface roughness level of the working surface of the rails 10; on the premise that the strength is not reduced year-on-year, the weight of the materials for manufacturing the rail cars of the rails 10 is improved, and the weight is reduced compared with the original rail cars of the rails 10. After the quantification of the entire maintenance rail vehicle, the time for personnel handling and installation operations is reduced, the intrinsic safety of personnel operations is improved, and a significant decrease in the radiation dose level received by personnel is achieved.

[0033] The pump housing connecting frame 30 is arranged on their respective rails 10 for installing the entire maintenance rail vehicle on the main pump motor support 100, that is, a pump housing connecting frame 30 is installed on each rail 10, further enhancing the stability and load-bearing capacity of the rail vehicle. The pump housing connecting frame 30 can be in a triangular structure, with one end fixed on the support of the main pump motor and the other end fixed on the rail 10, and then the entire maintenance rail vehicle is installed and fixed in the installation threaded holes reserved on the main pump motor support.

[0034] Each of the deceleration mechanisms 40 includes an enclosed speed reducer 41. A speed reducer connecting plate 90 is connected between the two speed reducers 41. The hoisting mechanism 50 includes a sling 51, and the speed reducer 41 drives the sling 51 to perform a hoisting motion. The speed reducer 41 can be driven by a motor to move, thereby driving the sling 51 to perform a lifting motion. Of course, the speed reducer 41 can also be manually driven. For example, the maintenance track vehicle includes a ratchet wrench 70 for driving the speed reducer 41. A connecting rod coaxial with the main shaft wheel of the speed reducer 41 is connected to the speed reducer 41, and the ratchet wrench 70 is connected to the connecting rod. Thus, it is convenient for the staff to operate the speed reducer 41 by operating the ratchet wrench 70, thereby realizing the hoisting of the sling 51 and the rise or fall of the lifted object such as the main pump shaft seal suspended at the end of the sling 51. The enclosed speed reducer 41 means that its internal parts are not exposed, which solves the time risk of foreign objects caused by the easy dropping of worn metal chips during the operation of the original track 10 trolley. The speed reducer 41 relies on a screw pair transmission to achieve deceleration and stepping.

[0035] Further, in some preferred embodiments, the hoisting mechanism 50 includes a sling pulley assembly 52 and a rope winding wheel assembly 53. The rope winding wheel assembly 53 is key-connected to the main wheel shaft of the speed reducer 41. One end of the sling 51 is fixed to the rope winding wheel assembly 53 through the sling 51 pulley assembly. Such a design makes the hoisting motion of the sling 51 smoother and more reliable. The deceleration mechanism 40 includes a fixed flange 42. The trolley 20 includes a vehicle body 21. The two vehicle bodies 21 are fixedly connected, and a certain space is formed between the vehicle bodies. The speed reducer 41 is fixed to the single-sided vehicle body 21 through the fixed flange 42. Among them, the speed reducer 41 is first installed on the fixed flange 42, the fixed flange 42 is then assembled to the single-sided vehicle body 21, and then the bearing seat inserted into the main wheel shaft in the previous step is installed on the fixed flange 42. Finally, the rope winding wheel assembly 53 is inserted into the main wheel shaft, and then through the sling pulley assembly 52, the sling 51 is driven to rise and fall by key-link transmission, and the smooth lifting action of the main pump parts to be repaired is realized in cooperation with various special tools for pump maintenance.

[0036] Furthermore, in some preferred embodiments, the trolley 20 includes a vehicle body 21 disposed oppositely, and track wheels 22 disposed between the two vehicle bodies 21. The trolley 20 is connected to respective tracks 10 through the track wheels 22. Such a design enables the trolley 20 to move freely on the tracks 10, and the movement is stable and reliable. Further, preferably, the track wheels 22 are T-shaped track wheels 22, and the tracks 10 are I-shaped tracks 10. The T-shaped track wheels 22 are arranged in groups. Such a design makes the movement of the trolley 20 on the tracks 10 smoother and more stable, and can bear a greater weight. During installation, the two sets of T-shaped track wheels 22 are respectively installed on their corresponding tracks 10. The installation positions of the two sets of T-shaped track wheels 22 are one in front and the other behind, and the trolleys on the left and right tracks 10 are fixedly connected together by a set of detachable connecting rods to maintain synchronous and consistent forward and backward movement.

[0037] In a preferred embodiment, the trolley 20 further includes a reinforcing shaft assembly 23. The reinforcing shaft assembly 23 is in a rod shape, and the reinforcing shaft assembly 23 transversely connects the two vehicle bodies 21, enhancing the structural strength and stability of the trolley 20.

[0038] In a preferred embodiment, a trolley locking device 60 is provided on the trolley 20. The trolley locking device 60 includes a locking handle 61 and a locking portion 62 connected to the locking handle. By tightening the locking handle 61, the locking portion 62 can have a radial protrusion amount relative to the vehicle body of the trolley 20, generating frictional force with the track to thereby fix the position of the trolley 20 on the track. Such a design enables the trolley 20 to remain stationary on the track 10 through the trolley locking device 60 when hoisting the main pump parts, fixing the position of the trolley 20 and preventing its accidental movement.

[0039] Further, preferably, the end of the locking portion is coated with a rubber sleeve. Such a design can increase the frictional force between the locking portion and the track, further preventing the accidental movement of the trolley 20. And the setting of the rubber sleeve avoids scratching the track 10 during locking.

[0040] Further, preferably, the maintenance track vehicle includes a ratchet wrench 70 for driving the speed reducer 41. A connecting rod coaxial with the main shaft wheel of the speed reducer 41 is connected to the speed reducer 41, and the ratchet wrench 70 is connected to the connecting rod; and / or, the maintenance track vehicle includes a motor for driving the speed reducer 41.

[0041] Further, preferably, the maintenance track vehicle includes a track connecting rod 80. The track connecting rod 80 is detachably connected between the two trolleys 20. Such a design makes the installation and disassembly of the track connecting rod 80 more convenient and fast, facilitating transportation and storage. The trolley 20 can move freely on the track 10. Through the connection of the track connecting rod 80, the synchronism and stability of the movement are ensured.

[0042] In a specific embodiment, the maintenance rail car includes a reducer connecting plate 90. The reducer connecting plate 90 is connected between the two reducers 41, further ensuring stability.

[0043] The rail car for nuclear main pump maintenance of the present utility model has been implemented and applied in domestic nuclear power plants. By reducing the weight of the installation equipment, the lightweight improvement of personnel and equipment assembly is realized, the working hours of personnel in the high-dose area in the R area are reduced, the radiation dose received by personnel is reduced, and the intrinsic safety and working efficiency of maintenance are improved. The rail car for nuclear main pump maintenance of the present utility model has at least the following effects:

[0044] The rail car for nuclear main pump maintenance of the present utility model has the following advantages and effects:

[0045] 1. Through a unique design, the easy hoisting and moving of the main pump are realized, greatly improving the maintenance efficiency;

[0046] 2. The design of the pulley allows it to move freely on the track, and the movement is stable and reliable;

[0047] 3. The design of the hoisting mechanism makes the hoisting movement of the sling more stable and reliable, and it can be conveniently manually driven;

[0048] 4. The overall structure is simple and compact, facilitating transportation and storage.

[0049] The above embodiments are only used to illustrate the technical concept and characteristics of the present utility model, and their purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly, and cannot limit the protection scope of the present utility model. All equivalent changes and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A rail car for nuclear main pump maintenance, characterized in that: It includes two tracks arranged opposite to each other, a pulley capable of moving on each track, a pump casing connecting frame, two speed reduction mechanisms respectively arranged on each pulley, and a hoisting mechanism; A pump casing connecting frame, arranged on each of the rails, for mounting the entire maintenance rail car on the main pump motor support; Each of the deceleration mechanisms comprises a closed reducer, the hoisting mechanism comprises a sling, and the reducer drives the sling to perform a hoisting motion.

2. The nuclear main pump maintenance rail vehicle according to claim 1 is characterized in that: The hoisting mechanism comprises a sling pulley assembly and a rope winding wheel assembly. The rope winding wheel assembly is key-connected to the main wheel shaft of the reducer. One end of the sling is fixed to the rope winding wheel assembly through the sling pulley assembly.

3. The nuclear main pump maintenance rail vehicle according to claim 1, characterized in that: The pulley comprises vehicle bodies arranged opposite to each other and track wheels arranged between the two vehicle bodies, and the pulleys are connected to respective tracks via the track wheels.

4. The nuclear main pump maintenance rail vehicle according to claim 3 is characterized in that: The pulley also includes a reinforcing shaft assembly, which transversely connects the two car bodies.

5. The nuclear main pump maintenance rail vehicle according to claim 3 is characterized in that: The track wheels are T-shaped track wheels, the track is an I-shaped track, and the T-shaped track wheels are arranged in groups.

6. The nuclear main pump maintenance rail vehicle according to claim 1, characterized in that: The pulley is provided with a trolley locking device, which includes a locking handle and a locking part connected to the locking handle. Tightening the locking handle can make the locking part have a radial protrusion relative to the pulley, contact with the track to generate friction and thus fix the position of the pulley on the track.

7. The nuclear main pump maintenance rail vehicle according to claim 6, characterized in that: The end of the locking portion is covered with a rubber sleeve.

8. The nuclear main pump maintenance rail vehicle according to claim 1, characterized in that: The maintenance rail vehicle includes a ratchet wrench for driving the reducer, the reducer is connected to a connecting rod coaxial with the main shaft wheel of the reducer, and the ratchet wrench is connected to the connecting rod; and / or, the maintenance rail vehicle includes a motor for driving the reducer.

9. The nuclear main pump maintenance rail vehicle according to claim 1, characterized in that: The speed reduction mechanism comprises a fixing flange, the pulley comprises a vehicle body, and the speed reducer is fixed on the vehicle body via the fixing flange.

10. The nuclear main pump maintenance rail vehicle according to claim 1, characterized in that: The maintenance rail vehicle comprises a rail connecting rod and / or a reducer connecting plate, wherein the rail connecting rod is detachably connected between the two pulleys; and a reducer connecting plate is connected between the two reducers.

Images