Limited space transfer trolley for large horizontal motor in nuclear power station

Abstract

The invention belongs to the technical field of nuclear power station heavy equipment transportation, and particularly relates to a limited space transfer trolley for a large horizontal motor of a nuclear power station. The four rotating shafts are arranged in parallel in pairs and are respectively fixed below the front part and the rear part of the trolley bracket through bearings, and two wheels are respectively arranged at two ends of each rotating shaft; the four speed reducers A are provided with driving motors and are respectively fixed on the trolley frame, and gears of the speed reducers A are respectively meshed with gears of the four rotating shafts; the rotating disc is composed of a disc serving as a tray, a thrust bearing, an upper bearing chamber and a lower bearing chamber, the tray is connected with the lower bearing chamber in a welded mode, a circle of gears matched with the speed reducer B are arranged on the edge of the tray, and the top end of the upper bearing chamber is fixed to the bottoms of a plurality of evenly-distributed jacking oil cylinders. The top end of each jacking oil cylinder is fixedly installed below the middle of the trolley frame. The maintenance manpower and material cost is saved, and the transportation safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of transportation of major equipment in nuclear power plants, and particularly relates to a transfer trolley for a large horizontal motor in a nuclear power plant in a limited space. Background Art

[0002] The main feed water pump motor of a nuclear power unit is a major piece of equipment for large horizontal motors in a power plant. The net weight of the motor can reach 34 tons. There are multiple steel gratings in the motor transfer passage, and the load-bearing capacity is limited. Operating on the steel gratings for a long time greatly increases the safety risk of transportation. Previously, the transfer work of this motor in nuclear power plants mainly relied on the method of transporting the motor by a transportation small tank + a manual hoist, and there are the following disadvantages:

[0003] 1. The equipment transportation work requires a large amount of manpower input and a long transportation time. Using the traditional method of transporting a single motor with a transportation small tank + a manual hoist requires continuous work for about 14 hours and more than 20 people need to be invested.

[0004] 2. It affects the repair progress of emergency defects. The main feed water pump motor is a key and sensitive equipment in a nuclear power plant, and the traditional transportation method will affect the equipment repair progress.

[0005] 3. The transportation safety risk is high. The main feed water pump motor is heavy, and the load-bearing capacity of the steel gratings on the transportation path is limited. The traditional transportation method has a high risk of equipment tipping over.

[0006] In view of the above problems existing in the transportation process of the main feed water pump motor of the current second-generation improved pressurized water reactor nuclear power unit, it is urgent to design an automatic transfer trolley for equipment to meet the on-site equipment transportation requirements. Summary of the Invention

[0007] The purpose of the present invention is to provide a transfer trolley for a large horizontal motor in a nuclear power plant in a limited space, solve the problems existing in the motor transportation process, save the labor and material costs of maintenance, and improve transportation safety.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A limited-space transfer trolley for large horizontal motors in nuclear power plants, comprising a reducer A, an electrical control cabinet, a hydraulic oil station, a jacking oil cylinder, wheels, a reducer B, a turntable, limit switches, a trolley frame and a rotating shaft; there are four rotating shafts, arranged in two parallel groups, respectively fixed to the lower front and lower rear of the trolley bracket through bearings, and two wheels are installed at both ends of each rotating shaft; there are four reducers A, each with its own driving motor, fixed to the trolley frame respectively, and the gears of the reducers A are meshed with the gears of the four rotating shafts respectively; the turntable consists of a disc as a tray, equipped with a set of thrust bearings and upper and lower bearing chambers, the tray is connected to the lower bearing chamber by welding, a circle of gears matching the reducer B is provided at the edge of the tray, the top of the upper bearing chamber is fixed to the bottoms of a plurality of evenly distributed jacking oil cylinders, and the top of each jacking oil cylinder is respectively fixed and installed under the middle of the trolley frame; the reducer B has its own driving motor, the body of the reducer B is welded to the upper bearing chamber of the turntable, the gear of the reducer B is meshed with the gear at the edge of the tray of the turntable, and the reducer B provides the driving power for the trolley to turn; the hydraulic oil station is fixed above the front of the trolley frame and arranged side by side with the electrical control cabinet, and provides hydraulic oil for the jacking oil cylinders through the hydraulic oil station; there are two limit switches, respectively used for the jacking limit and lowering limit of the trolley frame, the limit switches are installed at the bottom of the trolley frame near the turntable, the two limit switches are arranged vertically, the limit switch installed below is used as the jacking limit of the trolley frame, and the limit switch installed above is used as the lowering limit of the trolley frame; the electrical control cabinet is fixed above the front of the trolley frame, controls the reducer A respectively to make the trolley move forward and backward, controls the hydraulic oil station to make the trolley jack up and lower, and controls the reducer B to make the trolley rotate.

[0010] The reducer B is equipped with a handwheel connecting shaft, universal joints are provided at both ends of the handwheel connecting shaft, one end is connected to the reducer B by bolts, and the other end is fixed to the trolley frame through a bearing and a transmission rod is led out and fixedly connected to the handwheel, and the reducer B can be manually driven to realize the turning of the trolley.

[0011] A remote control wireless control system is installed in the electrical control cabinet, which can realize wireless handle remote control, and the operation function of the wireless handle is the same as that of the electrical control cabinet panel.

[0012] The hydraulic oil station consists of an oil pump, an oil pump motor, an oil storage tank and a pressure equalizing device. The hydraulic oil in the oil storage tank is pressed to the pressure equalizing device through the operation of the oil pump of the hydraulic oil station, and then flows to each jacking oil cylinder through the pressure equalizing device to ensure that each jacking oil cylinder receives the same oil pressure.

[0013] The wheels are made of steel and rubber materials.

[0014] The transmission ratio of the reducer A is 887:1, and the output speed is 1.6 r / min.

[0015] The reduction ratio of speed reducer B is 180:1, and the output speed is 5.0 r / min.

[0016] The electric control cabinet uses PLC programming, and there are lifting, lowering, left-turning, right-turning, forward, backward and emergency stop operation buttons on its panel respectively.

[0017] When the trolley needs to turn, the hydraulic oil station provides hydraulic oil for the lifting cylinder, so that the lifting cylinder extends until the trolley frame is lifted to touch the lifting limit of the limit switch, and the hydraulic oil station stops working and the lifting cylinder stops lifting; at this time, the wheels are completely suspended, and the tray of the turntable contacts the ground.

[0018] After the trolley is lifted, the reaction force generated during the operation of speed reducer B will push the trolley frame to rotate with the thrust bearing of the turntable as the support to achieve the purpose of turning; after the turning is completed, the hydraulic oil station releases the pressure of the lifting cylinder, so that the trolley frame descends until the turntable retracts to the lowering limit of the limit switch, and the hydraulic oil station stops working and the lifting cylinder stops retracting; at this time, the tray of the turntable is lifted and separated from the ground contact, and the wheels are in direct contact with the ground.

[0019] The beneficial effects achieved by the present invention are as follows:

[0020] (1) Reduce labor input: Using this automated transfer trolley, the transfer work no longer requires manual operation of the chain block, and only 1 operator and 4 team members are needed. The labor cost is reduced from more than 20 people to 5 people.

[0021] (2) Shorten the maintenance period: The shortest historical transfer period took 14 hours and required continuous operation. However, the introduction of this automated transfer trolley has reduced the shortest time to only 1 hour and 20 minutes, greatly shortening the transfer duration.

[0022] (3) Reduce the safety risk of transporting major equipment: This automated transfer trolley is driven by an electric motor, shortening the transportation time of the equipment above the steel grating; at the same time, it avoids the risk of equipment tipping caused by using a chain block to tow and repeatedly jacking the motor with a hydraulic jack. Description of the Drawings

[0023] Figure 1 It is the front view of the limited-space transfer trolley for large horizontal motors in nuclear power plants;

[0024] Figure 2 It is the top view of the limited-space transfer trolley for large horizontal motors in nuclear power plants;

[0025] Figure 3 It is the bottom view of the limited-space transfer trolley for large horizontal motors in nuclear power plants;

[0026] Figure 4It is a cross-sectional view of a transfer cart for a large horizontal motor in a nuclear power plant in a limited space.

[0027] In the figure: 1. Reducer A; 2. Handwheel; 3. Electrical control cabinet; 4. Hydraulic oil station; 5. Jacking cylinder; 6. Wheel; 7. Reducer B; 8. Turntable; 9. Limit switch; 10. Handwheel connecting shaft; 11. Cart frame; 12. Rotating shaft. Specific implementation mode

[0028] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] As Figures 1 to 4 A transfer cart for a large horizontal motor in a nuclear power plant in a limited space as shown includes four reducers A1, two handwheels 2, one electrical control cabinet 3, one hydraulic oil station 4, jacking cylinders 5, sixteen wheels 6, two reducers B7, turntables 8, two limit switches 9, two handwheel connecting shafts 10, one cart frame 11, and four rotating shafts 12.

[0030] The cart frame 11 is a rectangular frame welded structure, with the center area of the cart frame 11 for loading. A hollow rectangular frame is welded near the loading area in the traveling direction of the cart frame 11 for installing the rotating shafts 12, wheels 6, and reducers A1.

[0031] The four rotating shafts 12 are arranged in two groups parallel to each other, and are respectively fixed at the front and rear of the cart support 11 through bearings. Two circular wheels 6 are installed at both ends of each rotating shaft 12 through bolts. The wheels 6 are made of steel with rubber material, and the rubber material can provide the grip of the cart during traveling to avoid slipping of the cart during traveling.

[0032] There are four reducers A1, each with a built-in drive motor. One reducer A1 and one rotating shaft 12 are paired as a group, and each group is paired with four wheels 6. The reducer A1 body is fixed on the cart frame 11 near the wheel 6 through bolts. The rotating shaft 12 passes through the gearbox of the reducer A1, and the gears in the gearbox of the reducer A1 mesh with the gears on the rotating shaft 12 to provide the driving force for the forward and backward movement of the cart. The transmission ratio of the reducer A1 is 887:1, and the output speed is 1.6 r / min.

[0033] The described turntable 8 consists of upper and lower parts. The upper part of the turntable 8 is equipped with a bearing chamber for installing the shaft ring of the thrust bearing. The lower part of the turntable 8 uses a disc with an outer diameter of Φ2050 as a tray and is equipped with a bearing chamber for installing the seat ring of the thrust bearing. The shaft ring and seat ring of the thrust bearing are respectively installed in the upper and lower bearing chambers of the turntable 8, and through bolts are used to connect the upper and lower parts of the turntable 8 to prevent the separation of the shaft ring and seat ring of the thrust bearing. A circle of gears that cooperate with the reducer B7 is provided at the edge of the lower tray of the turntable 8. The upper part of the turntable 8 is fixed to the bottoms of eight jacking cylinders 5 evenly distributed at intervals of 45° through bolts, and the tops of the eight jacking cylinders 5 are fixedly installed below the trolley frame 11 through bolts.

[0034] When the trolley needs to turn, the hydraulic oil station 4 provides hydraulic oil for the jacking cylinders 5, causing the jacking cylinders 5 to extend. As a result, the lower tray of the turntable 8 comes into direct contact with the ground. Then, continue to extend the jacking cylinders 5 until the trolley frame 11 is jacked up to touch the jacking limit of the lower limit switch 9 below, and the hydraulic oil station 4 stops working, and the jacking cylinders 5 stop jacking and remain in that state. At this time, the trolley wheels 6 are completely suspended, and the weight of the trolley frame 11 and the motor is transmitted to the tray of the turntable 8 through the thrust bearing on the turntable 8. The tray contacts the ground and bears all the weight of the trolley and the motor.

[0035] The described reducer B7 comes with its own drive motor. Two reducer B7 bodies are respectively welded to the upper part of the turntable 8 and are arranged symmetrically in a straight line. The gears of the reducer B7 mesh with the gears on the lower tray of the turntable 8, and the reducer B7 provides the driving power for the trolley to turn. The transmission ratio of the reducer B7 is 180:1, and the output speed is 5.0 r / min. When the trolley is jacked up, the reaction force generated during the operation of the reducer B7 will push the trolley frame 11 to rotate with the thrust bearing at the lower part of the turntable 8 as the support to achieve the purpose of turning. After the turning is completed, the hydraulic oil in the jacking cylinders 5 is released and recovered through the hydraulic oil station 4, causing the trolley frame 11 to descend. After the trolley wheels 6 contact the ground, the turntable 8 starts to lift upward until the upper limit switch 9 is triggered, and the hydraulic oil station 4 stops working, and the jacking cylinders 5 stop recovering. At this time, the lower tray of the turntable 8 is lifted and separated from the ground contact, and the trolley wheels 6 contact the ground directly and bear all the weight of the trolley and the motor.

[0036] The described reducer B7 is equipped with two handwheel connecting shafts 10 as a manual driving device. Universal joints are provided at both ends of the handwheel connecting shaft 10, and the position is arranged at the bottom of the trolley frame 11. One end of the connecting shaft 10 is fixed to the shaft of the reducer B7 and fixed through bolts, and the other end is equipped with deep groove ball bearings and installed on the trolley frame 11. Two transmission rods with a length of 50 mm are led out through the trolley frame 11 and bolted and fixed to the handwheel 2 for manually driving the reducer B7 to achieve the turning of the trolley.

[0037] The described hydraulic oil station 4 consists of an oil pump, an oil pump motor, an oil storage tank, and a pressure equalizing device. The hydraulic oil station 4 is fixed above the front part of the trolley frame 11 by bolts and is arranged side by side with the electrical control cabinet 3. Through the operation of the oil pump of the hydraulic oil station 4, the hydraulic oil in the oil storage tank is pressed to the pressure equalizing device, and then flows to the eight jacking cylinders 5 through the pressure equalizing device. The pressure equalizing device can ensure that the eight jacking cylinders 5 receive the same oil pressure, guarantee that the jacking height and speed of the eight jacking cylinders 5 are consistent, and avoid problems such as jacking tilt, equipment overturning, or cylinder explosion caused by uneven pressure of the jacking cylinders 5.

[0038] There are two described limit switches 9, which are respectively used for the jacking limit and the lowering limit of the trolley frame 11. The described limit switches 9 are arranged vertically on the same bracket (the upper one is the lowering limit, and the lower one is the jacking limit). The fixing bracket is installed at the bottom of the trolley frame 11 near the turntable 8 by bolts. The limit switch 9 installed below is used as the jacking limit of the trolley frame 11, and the limit switch 9 installed above is used as the lowering limit of the trolley frame 11. After the trolley frame 11 reaches the highest jacking height, it touches the jacking limit of the limit switch 9, and the jacking operation of the trolley stops; when the wheels 6 of the trolley frame 11 land during lowering, the turntable 8 will continue to rise. When the turntable 8 is fully retracted and touches the lowering limit of the limit switch 9, the trolley will stop the lowering operation, and the turntable 8 will stop rising.

[0039] The described electrical control cabinet 3 is fixed above the front part of the trolley frame 11 by bolts. The control part of the electrical control cabinet 3 uses PLC programming to control the reduction gear A1 through circuits to realize the forward and backward movement of the trolley, control the hydraulic oil station 4 to realize the jacking and lowering of the trolley, and control the reduction gear B7 to realize the rotation of the trolley. On the panel of the described electrical control cabinet 3, there are respectively operation buttons such as jacking, lowering, left turn, right turn, forward, backward, and emergency stop. A remote control wireless control system is installed in the electrical control cabinet 3, which can realize wireless handle remote control. The operation function of the wireless handle is the same as that of the panel of the electrical control cabinet 3.

[0040] When automating the transfer of the main feed water pump motor of a nuclear power plant, place the main feed water pump motor of the nuclear power unit above the middle of the trolley frame 11. Send a control command to the trolley through the electrical control cabinet 3, and then drive the trolley forward or backward through the operation of the speed reducer A1. When the trolley needs to turn, stop the forward or backward operation of the speed reducer A1. After the trolley stops stably, operate the lifting button on the electrical control cabinet 3 or the wireless handle to provide lifting power for the lifting cylinder 5 through the hydraulic oil station 4. After the trolley frame 11 is lifted to the lifting limit, the electrical control cabinet 3 automatically stops the lifting operation. Then operate the steering button on the electrical control cabinet 3 or the wireless handle to turn left or right. After completing the turning operation, operate the lowering button on the electrical control cabinet 3 or the wireless handle until the trolley frame 11 reaches the lowering limit, and the electrical control cabinet 3 automatically stops the lowering operation. Then operate the forward or backward button on the electrical control cabinet 3 or the wireless handle to perform the forward or backward operation. In case of power failure or trolley failure, the manual steering function of the trolley can be realized by manually operating the handwheel 2 on the speed reducer B7.

[0041] A limited-space transfer trolley for large horizontal motors in nuclear power plants, comprising a reducer A1, an electrical control cabinet 3, a hydraulic oil station 4, a jacking oil cylinder 5, wheels 6, a reducer B7, a turntable 8, limit switches 9, a trolley frame 11, and a rotating shaft 12; there are four rotating shafts 12, arranged in parallel in two groups of two, and are respectively fixed to the lower front and lower rear of the trolley support 11 through bearings. Two wheels 6 are respectively installed at both ends of each rotating shaft 12 through bolts; there are four reducers A1, each with a built-in drive motor, and are respectively fixed to the trolley frame 11 through bolts, so that the gears of the reducers A1 are respectively meshed with the gears of the four rotating shafts 12; the turntable 8 consists of a disc as a tray, paired with a set of thrust bearings and upper and lower bearing housings. The tray is connected to the lower bearing housing by welding, and a circle of gears cooperating with the reducer B7 is provided at the edge of the tray; the top of the upper bearing housing is fixed to the bottoms of a plurality of evenly distributed jacking oil cylinders 5 through bolts, and the top of each jacking oil cylinder 5 is respectively fixed and installed under the middle of the trolley frame 11 through bolts; the reducer B7 has a built-in drive motor, and the body of the reducer B7 is welded to the upper bearing housing of the turntable 8. The gear of the reducer B7 is meshed with the gear at the edge of the tray of the turntable 8, and the reducer B7 provides the driving power for the trolley to turn; the hydraulic oil station 4 is fixed to the upper front of the trolley frame 11 through bolts and is arranged side by side with the electrical control cabinet 3, and provides hydraulic oil for the jacking oil cylinder 5; there are two limit switches 9, which are respectively used for the jacking limit and lowering limit of the trolley frame 11; the limit switches 9 are installed at the bottom of the trolley frame 11 near the turntable 8 through bolts. The two limit switches 9 are arranged vertically. The limit switch 9 installed below is used as the jacking limit of the trolley frame 11, and the limit switch 9 installed above is used as the lowering limit of the trolley frame 11. After the trolley frame 11 reaches the jacking and lowering heights and is limited, the jacking and lowering operations can automatically stop; the electrical control cabinet 3 is fixed to the upper front of the trolley frame 11 through bolts. The control part of the electrical control cabinet 3 uses PLC programming, and respectively controls the reducer A1 through circuits to realize the forward and backward movement of the trolley, controls the hydraulic oil station 4 to realize the jacking and lowering of the trolley, and controls the reducer B7 to realize the rotation of the trolley; operation buttons are provided on the panel of the electrical control cabinet 3.

[0042] The reducer B7 is equipped with a handwheel connecting shaft 10 as a manual driving device; universal joints are provided at both ends of the handwheel connecting shaft 10. One end is connected to the reducer B7 through bolts, and the other end is fixed to the trolley frame 11 through a bearing and a transmission rod is led out and fixedly connected to the handwheel 2, so that the reducer B7 can be manually driven to realize the turning of the trolley.

[0043] A remote control wireless control system is installed in the electrical control cabinet 3, which can realize wireless handle remote control. The operation function of the wireless handle is the same as that of the panel of the electrical control cabinet 3.

[0044] The described hydraulic oil station 4 consists of an oil pump, an oil pump motor, a storage oil tank, and a pressure equalizing device. The hydraulic oil in the storage oil tank is pumped to the pressure equalizing device through the operation of the oil pump of the hydraulic oil station 4, and then flows to each jacking cylinder 5 through the pressure equalizing device to ensure that each jacking cylinder 5 receives the same oil pressure.

[0045] The described wheel 6 is made of steel material and rubber material.

[0046] The transmission ratio of the described reducer A1 is 887:1, and the output speed is 1.6 r / min.

[0047] The transmission ratio of the described reducer B7 is 180:1, and the output speed is 5.0 r / min.

[0048] On the panel of the described electrical control cabinet 3, there are respectively provided jacking, lowering, left rotation, right rotation, forward, backward, and emergency stop operation buttons.

[0049] When the trolley needs to turn, the hydraulic oil station 4 provides hydraulic oil for the jacking cylinder 5 to make the jacking cylinder 5 extend until the trolley frame 11 is jacked up to touch the jacking limit of the limit switch 9, at which time the hydraulic oil station 4 stops working and the jacking cylinder 5 stops jacking; at this time, the trolley wheels 6 are completely suspended, and the tray of the turntable 8 contacts the ground.

[0050] After the trolley is jacked up, the reaction force generated when the reducer B7 operates will push the trolley frame 11 to rotate with the thrust bearing of the turntable 8 as the support to achieve the purpose of turning; after the turning is completed, the hydraulic oil station 4 relieves the pressure of the jacking cylinder 5 to make the trolley frame 11 lower until the turntable 8 retracts to the lowering limit of the limit switch 9, at which time the hydraulic oil station 4 stops working and the jacking cylinder 5 stops retracting; at this time, the tray of the turntable 8 is lifted and separated from the ground contact, while the trolley wheels 6 are in direct contact with the ground.

Claims

1. A limited-space transfer trolley for large horizontal motors in nuclear power plants, characterized in that: It includes a speed reducer A, an electrical control cabinet, a hydraulic oil station, a jacking cylinder, wheels, a speed reducer B, a turntable, limit switches, a trolley frame, and a rotating shaft; there are four rotating shafts, arranged in two parallel groups, and are respectively fixed under the front and rear of the trolley support through bearings. Two wheels are installed at both ends of each rotating shaft. There are four speed reducers A, each with a built-in drive motor, which are respectively fixed on the trolley frame, and the gears of the speed reducers A are respectively meshed with the gears of the four rotating shafts; the turntable consists of a disc as a tray, a set of thrust bearings, and upper and lower bearing chambers. The tray is connected to the lower bearing chamber by welding. A circle of gears cooperating with the speed reducer B is provided at the edge of the tray. The top of the upper bearing chamber is fixed at the bottom of a plurality of evenly distributed jacking cylinders. The top of each jacking cylinder is respectively fixed and installed under the middle of the trolley frame; the speed reducer B has a built-in drive motor, and the body of the speed reducer B is welded on the upper bearing chamber of the turntable. The gear of the speed reducer B is meshed with the gear at the edge of the tray of the turntable, and the speed reducer B provides the driving power for the trolley to turn; the hydraulic oil station is fixed above the front of the trolley frame and is arranged side by side with the electrical control cabinet, and provides hydraulic oil for the jacking cylinders through the hydraulic oil station. There are two limit switches, which are respectively used for the jacking limit and the lowering limit of the trolley frame. The limit switches are installed at the bottom of the trolley frame near the turntable. The two limit switches are arranged vertically. The limit switch installed below is used as the jacking limit of the trolley frame, and the limit switch installed above is used as the lowering limit of the trolley frame; the electrical control cabinet is fixed above the front of the trolley frame, and respectively controls the speed reducer A to realize the forward and backward movement of the trolley, controls the hydraulic oil station to realize the jacking and lowering of the trolley, and controls the speed reducer B to realize the rotation of the trolley.

2. The limited-space transfer trolley for large horizontal motors in nuclear power plants according to claim 1, characterized in that: The speed reducer B is equipped with a handwheel connecting shaft. Universal joints are provided at both ends of the handwheel connecting shaft. One end is connected to the speed reducer B by bolts, and the other end is fixed on the trolley frame through a bearing and a transmission rod is led out and fixedly connected to the handwheel, and the speed reducer B can be manually driven to realize the turning of the trolley.

3. The limited-space transfer trolley for large horizontal motors in nuclear power plants according to claim 1, wherein: A remote control wireless control system is installed in the electrical control cabinet, which can realize wireless handle remote control. The operation function of the wireless handle is the same as that of the electrical control cabinet panel.

4. The limited-space transfer trolley for large horizontal motors in nuclear power plants according to claim 1, wherein: The hydraulic oil station consists of an oil pump, an oil pump motor, a fuel tank, and a pressure equalizing device. The hydraulic oil in the fuel tank is pressed to the pressure equalizing device through the operation of the oil pump of the hydraulic oil station, and then flows to each jacking cylinder through the pressure equalizing device to ensure that each jacking cylinder receives the same oil pressure.

5. The limited-space transfer trolley for large horizontal motors in nuclear power plants according to claim 1, characterized in that: The wheels are made of steel and rubber materials.

6. The limited-space transfer trolley for large horizontal motors in nuclear power plants according to claim 1, characterized in that: The transmission ratio of the speed reducer A is 887:1, and the output speed is 1.6 r / min.

7. The limited-space transfer trolley for large horizontal motors in nuclear power plants according to claim 1, wherein: The transmission ratio of the speed reducer B is 180:1, and the output speed is 5.0 r / min.

8. The limited-space transfer trolley for large horizontal motors in nuclear power plants according to claim 1, characterized in that: The electrical control cabinet uses PLC programming, and its panel is respectively provided with jacking, lowering, left turn, right turn, forward, backward, and emergency stop operation buttons.

9. The limited-space transfer trolley for large horizontal motors in nuclear power plants according to claim 1, wherein: When the trolley needs to turn, the hydraulic oil station provides hydraulic oil for the jacking cylinders to make the jacking cylinders extend until the trolley frame is jacked up to touch the jacking limit of the limit switch, and the hydraulic oil station stops working and the jacking cylinders stop jacking; at this time, the wheels are completely suspended, and the tray of the turntable contacts the ground.

10. The limited-space transfer trolley for large horizontal motors in nuclear power plants according to claim 1, wherein: When the trolley is lifted, the reaction force generated during the operation of the reducer B will push the trolley frame to rotate with the thrust bearing of the turntable as the support, so as to achieve the purpose of steering; After the steering is completed, the hydraulic oil station is used to relieve the pressure of the lifting cylinder, so that the trolley frame descends until the turntable retracts to the lower limit of the limit switch, at which time the hydraulic oil station stops working and the lifting cylinder stops retracting; at this time, the tray of the turntable is lifted and separated from the ground contact, while the wheels are in direct contact with the ground.

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