JPH0494397A - Overhead traveling crane - Google Patents

Abstract

PURPOSE:To obviate frictional force between a traveling truck and cross moving and traveling rails for prevention of breakage by mounting a truck capable of traveling on rails respectively provided on a trolley and girder, and freeing trolley cross moving wheels and girder traveling wheels with a clutch turned off in traveling of the truck. CONSTITUTION:A traveling truck 7 is mounted through wheels 8 on a rails 10 provided on a trolley 22, and an anchor clamp 6 is fixed to the rail 10 by a clamp drive device 5. A spring plate 9 abutting against the wheel 8 is fixed to one end of the rail 10, and a stopper 21 is provided on the other end of the rail 10. The traveling truck 7 is provided with a cross moving reduction gear 2, and the drive shaft 11 thereof is connected to cross moving wheels 17 through a clutch type joint 13 and clutch type wheel drive shaft 15. A signal is sent to the drive device 5 in an earthquake to disengage a clamp 6 from the rail 10. The traveling truck 7 is caused to travel to the stopper 21 by a spring force to turn off the clutch so that wheels 17 are freely rotated to obviate friction between the wheels and rail 19 and prevent breakage. Same applies to the girder.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an overhead crane, and in particular, in the event of an earthquake, the traversing wheels of the trolley and the running wheels of the girder can safely roll on the rails, and the traversing wheels , relates to an overhead crane with a seismic isolation structure used in power plants that prevents damage to traveling wheels and rails.

(Prior Art) An overhead crane in a power plant is composed of a trolley and a girder, the trolley is equipped with a traversing device for moving the trolley, and the girder is equipped with a traveling device for moving the girder.

A conventional traversing device and traveling device will be explained with reference to FIGS. 5 to 7.

FIG. 5 shows a conventional traversing device that does not have a moving trolley or the like. FIGS. 6 and 7 show a conventional traveling device that does not have a moving truck or the like.

As shown in FIG. 5, the conventional traversing device includes a traversing motor 51.
Traverse brake 52. Traverse brake 53. Transverse reducer 54
．． Joint 55. Drive shaft 56. Wheel axle 57. bearing 60
．． On the other hand, a conventional traveling device consists of a bearing 62 and a traversing wheel 61.As shown in FIGS. 6 and 7, a conventional traveling device has a traveling motor 71. Travel brake 72. Travel reducer 73
．． Bearing 77, running wheel 78. @Uke79. Gear 81° Gear 82. It is composed of running wheels 83 and gears 84.

(Problems to be Solved by the Invention) First, problems with conventional trolleys will be explained. That is, when the trolley 22 is stored and in a stopped state, or when the trolley 22 is traversing, as shown in FIG. Drive shaft 56. Wheel axle 57. Joint 5
5. The traverse vehicle transport 61 is in a connected state, and this state will not change even if an earthquake occurs.

Therefore, when an earthquake occurs, the traversing wheels 61 are in a braked state, so they can slide on the traversing rails 63 against the horizontal seismic force in the direction parallel to the traversing rails 63.
A sliding friction force is generated between 1 and the traversing rail 63 due to the traversing wheel pressure. Also, from the experimental results, the maximum coefficient of static friction is 0.3, so the horizontal design seismic intensity during an earthquake is 0.
It becomes 3.

Therefore, when the crane is lifting a load with the rated load of the main hoist, the total weight of the trolley 22 and the rated load of the main hoist will act on the traversing rail 63, so for example, the total weight of the trolley 22 and the rated load of the main hoist. If is 235 (ton), then 1
The traverse wheel pressure per wheel is 58.75 (tons).

therefore, becomes.

Since the shear friction force is an excessive load, the traversing wheel 6
1 and the surface of the transverse rail 63 are scraped and damaged, so an improvement has been desired.

Next, problems with conventional girders will be explained. That is, when the girder 23 shown in FIG. 3 is stored and in a stopped state, or when the girder 23 is running, the traveling reducer 73, drive shaft 74, universal joint 75, The wheel axle 76 and the traveling wheels 78 are in a connected state, and this state does not change even if an earthquake occurs.

Therefore, when an earthquake occurs, since the running wheels 78 are in a braked state, they will slide on the running rails 80 due to the horizontal earthquake parallel to the running rails 80, and the running wheels 78
A sliding friction force is generated between the rail 80 and the running rail 80 due to the pressure of the running wheels. Also, from the experimental results, the maximum coefficient of static friction is 0.3, so the horizontal design seismic intensity during an earthquake is 0.3.
becomes.

Therefore, when the crane is lifting a load with the rated load of the main hoist, the total weight of the trolley 22, the girder 23, and the rated load of the main hoist will act on the traveling rail 80. If the total load of the main winding rated load is 470 (tons), the running wheel pressure per wheel is 5
It becomes 8.75 (ton). Therefore, it becomes.

Since the sliding friction force is an excessive load, the traveling wheel 7
Since the surfaces of the rail 8 and the running rail 80 are scraped and damaged, an improvement has been desired.

The present invention has been made to solve the above problems, and when an earthquake occurs, the wheels of the trolley and girder are separated from the reducer and the drive shaft, so that excessive sliding frictional force does not act on the wheels or the rails. To provide an overhead crane with a seismic isolation structure for a power plant that can safely roll on rails and prevent damage to wheels or rails.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a traveling bogie to which a speed reducer, a motor, and a brake constituting a traversing device and a traveling device are fixed to a trolley and a girder. It rides on a rail provided on a trolley and a girder, and a spring plate is provided on one of the wheels of the traveling bogie in parallel to the rail, and the traveling bogie has an accelerometer, a rail clamp drive device, a rail clamp, and a running device. It has a motor for driving bogie wheels, a chain for driving wheels of the running bogie, and a gear for driving the wheels of the running bogie, and the traversing reducer and the traversing wheels provided on the running bogie are connected by a drive shaft, a clutch-type joint, and a clutch-type wheel axle. The traveling speed reducer and the traveling wheels provided on the traveling bogie are connected by a drive shaft, a clutch-type universal joint, and a clutch-type wheel shaft.

(Operation) According to the present invention, when an earthquake occurs, an accelerometer that detects earthquake acceleration sends a signal to the anchor clamp drive device. The anchor clamp device operates the anchor clamp that was clamping the rail during normal operation, and the anchor clamp is separated from the rail. At the same time, a spring-loaded plate provided on one of the wheels of the traveling truck pushes the traveling truck wheel of the traveling truck, the traveling truck moves, and the clutch between the wheel shaft and the joint is disengaged. As a result, all of the traversing wheels are free from horizontal seismic force parallel to the traversing rail, creating a seismically isolated state in which almost no earthquake is transmitted to the trolley. Therefore, excessive sliding frictional force does not act on the traversing wheels and the traversing rail.

Also, for horizontal seismic forces parallel to the running rail.

All running wheels are free. Therefore,
Because the girder is in a seismically isolated state in which almost no seismic force is transmitted, no excessive sliding frictional force acts on the running wheels and rails.

(Example) An example of an overhead crane according to the present invention is shown in FIGS. 1 to 4.
This will be explained with reference to the figures.

As shown in FIG. 1, a traverse motor 1. Traverse reducer 2. Traverse brake 3. Traverse brake 4. Accelerometer 20. Anchor clamp drive device5. An anchor clamp 6 is fixed to a traveling carriage 7.

The traveling truck 7 rides on the rail 1° via the traveling truck wheels 8. The anchor clamps 6 sandwich the rails 10 and fix the traveling carriage 7. A spring-loaded plate 9 is attached to the wheel 8 of the traveling bogie.
are in contact with each other, and the spring-loaded plate 9 is fixed to one end of the rail 10. A stopper 21 is provided at the other end of the rail 10. The traversing reducer 2 and the traversing wheels 17 are connected to the drive shaft 11. Clutch type joint 13. Clutch type wheel axle 1
connected by 5.

The traveling truck 7 is equipped with a traveling truck wheel driving motor 24, a traveling truck wheel driving chain 25, and a traveling truck wheel driving gear 26 so that it can run by itself.

The same device as the device having the above configuration is further provided side by side on one side.

Further, as shown in FIG. 2, a traveling motor 31. Traveling brake 32. Travel reducer 33. Anchor clamp drive device 34
．． Anchor clamp 36. The accelerometer 35 is the traveling trolley 37
Fixed. The traveling truck 37 rides on rails 39 via traveling truck wheels 40. Anchor clamp 36
is holding rail 39. A spring-loaded plate 38 is in contact with the traveling truck wheels 40, and the spring-loaded plate 38 is fixed to the end of the rail 39. A stopper 4 is attached to the other end of the rail 39.
1 is provided. The traveling reducer 33 and the traveling wheels 46 are connected to a drive shaft 42. Clutch type universal joint 43.
They are connected by a clutch type wheel axle 44.

The traveling truck 37 is equipped with a traveling truck wheel driving motor 49, a traveling truck wheel driving chain 50, and a traveling truck wheel driving gear 51 so that it can run by itself.

A device identical to the device of the above construction is also provided at one girder end.

Next, the present invention will be explained in detail.

When the trolley 22 is stored and in a stopped state as shown in FIG. 1, the anchor clamp drive device 5 shown in FIG. 1 is operated by the operation stand 101 installed in the driver's cab 100 as shown in FIG. the anchor clamp 6 is separated from the rail 10, the traveling bogie 7 is moved to the stopper 21 side by operating the traveling bogie wheel drive motor 24, the traveling bogie wheel drive chain 25, and the traveling bogie wheel drive gear 26, and the clutch type Joint 13 and clutch type wheel axle 4
Separate 4.

This brings the traversing wheels 17 into a free state.

However, the transverse rail 19 must be kept in a horizontal state,
Since the trolley 22 is sufficiently heavy, the trolley 22 will not move from its storage position.

Therefore, in the above-mentioned state, the traversing wheels 17 of the trolley 22 roll safely without slipping on the traversing rails 19 against the horizontal seismic force parallel to the traversing rails 19.
7 and the transverse rail 19 are not subjected to excessive sliding frictional force.

On the other hand, when the trolley is moved sideways, as shown in FIG. 3, the operation stand 101 operates the traveling bogie wheel drive motor 24, the traveling bogie wheel drive chain 25, and the traveling bogie wheel drive gear 26 shown in FIG. Then, the traveling truck 7 is brought to the side of the transverse wheel 17, and the clutch type joint 13 and the clutch type wheel shaft 15 are connected.

If an earthquake occurs while the trolley is traveling, the accelerometer 20 that detects the earthquake acceleration sends a signal to the anchor clamp drive device 5 as shown in FIG. The anchor clamp drive device 5 is an anchor clamp 6 that has been holding the rail 1o.
is operated, and the anchor clamp 6 releases the rail 10.

At the same time, a spring-loaded plate 9 provided on one side of the wheels 8 of the traveling truck 7 pushes the traveling truck wheel 8 of the traveling truck 7, and when the traveling truck 7 moves toward the stopper 21, the clutch type joint 13 and the clutch Enter the car at 11! The i-axis 15 is separated.

As a result, the traversing wheels 17 of the trolley 22 roll safely without slipping on the traversing rail 19 against the horizontal seismic force parallel to the traversing rail 19, and an excessive sliding friction force acts on the traversing wheels 17 and the traversing rail 19. do not.

Therefore, while the trolley is stopped and traveling when an earthquake occurs, the traveling wheels 17 roll on the traveling rails 19, and as a result of a theoretical study, the acceleration in that case is about 0.004, and the acceleration between the traveling wheels 17 and the traveling rails 19 is approximately 0.004. The horizontal force will be almost equal to O.

Further, as shown in FIG. 2, when the girder 23 is retracted and in a stopped state, the operation stand 10 is closed as shown in FIG.
1, the anchor clamp drive device 3 shown in FIG.
4, the anchor clamp 36 is separated from the rail 39, and the traveling bogie 37 is connected to the traveling bogie wheel drive motor 4.
9, the traveling bogie wheel drive chain 50, and the traveling bogie wheel drive gear 51 are operated to move them toward the stopper 41 side, and the clutch type universal joint 43 and the clutch type wheel shaft 44 are separated.

This brings the running wheels 46 into a free state.

However, the traveling rail 48 must be kept in a horizontal state,
Since the girder 23 is sufficiently heavy, the girder 23 will not move from its storage position.

Therefore, in the above-mentioned state, the running wheels 46 of the girder 23 roll safely without slipping on the running rail 48 against the horizontal seismic force parallel to the running rail 48. No sliding friction force is applied.

On the other hand, when the crane is run, as shown in FIG. 3, the operation stand 101 is used to connect the traveling bogie wheel drive motor 49 and the traveling bogie wheel drive chain 50 shown in FIG.
and the traveling bogie wheel drive gear 51 are operated, and the traveling bogie 3
7 toward the traveling wheel 46 side, and the clutch type universal joint 43 and the clutch type wheel shaft 44 are connected.

If an earthquake occurs while the girder is running, the accelerometer 35 that detects the earthquake acceleration sends a signal to the anchor clamp drive device 34, as shown in Fig. 2, and the anchor clamp drive device i34 moves the rail 39 during normal operation. Operate the anchor clamp 36 that was holding the anchor clamp 36
releases the rail 39. At the same time, the spring-loaded plate 38 provided on one of the wheels 40 of the traveling truck 37 pushes the traveling truck wheel 40 of the traveling truck 37, and at the same time, the traveling truck 37 moves toward the stopper 41, and at the same time, the clutch-type universal joint 43 and the clutch type wheel shaft 44 can be separated.

As a result, the running wheels 46 of the girder 23 can safely roll against the horizontal seismic force parallel to the running rails 48 without causing the running rails 48 to slip.
Excessive frictional force does not act on the surface.

Therefore, from the above explanation, since the running wheels 46 roll on the running rails 48 while the crane is stopped and running when an earthquake occurs, the acceleration at that time is 0, similar to the above-mentioned trolley.
．． 004, the horizontal force on the running wheels 46 and the running rails 48 is almost equal to 0.

According to the above embodiment, if an earthquake occurs while the trolley is stopped or traveling, or while the girder is stopped or running, all wheels become free. Therefore, the trolley hardly moves because the trolley is in a seismically isolated state in which almost no horizontal seismic force in the direction parallel to the transverse rail is transmitted to the trolley. Moreover, almost no sliding friction force acts on the traversing wheels and the traversing rail.

Furthermore, when a suspended load is suspended, the frequency component of the sliding displacement in the response of the suspended load is sufficiently far from the natural frequency of the pendulum of the suspended load, so there is little effect on the sliding behavior of the trolley or girder. .

Furthermore, since the girder is in a seismically isolated state in which horizontal seismic force in a direction parallel to the running rail is hardly transmitted to the girder, the girder hardly moves. Furthermore, almost no sliding friction force acts on the running wheels and the running rail.

〔Effect of the invention〕

According to the present invention, since almost no load acts on the trolley traversing wheels and traversing rails, the girder running wheels and the running rails, the trolley can be placed on the girder and the girder can be placed on the runway girder stably and safely without damaging them. can be held.

[Brief explanation of drawings]

FIG. 1 is a side view showing the traversing device in the overhead crane of the present invention, FIG. 2 is a side view showing the traveling device in the overhead crane of the present invention, and FIG. 3 is a side view schematically showing the overhead crane of the present invention. , FIG. 4 is a side view taken along line IV-IV in FIG. 3, FIG. 5 is a side view showing a traversing device in a conventional overhead crane, and FIG. 6 is a side view showing a traveling device in a conventional overhead crane. FIG. 7 is a side view taken along the line ■-■ in FIG. 6. 1... Traverse motor 2... Traverse reducer 3.
-Traverse brake 4...Traverse brake 5...Anchor clamp drive device 6...Anchor clamp 7...Traveling trolley 8...
Traveling bogie wheel 9...Spring plate 10...Rail 11...Drive shaft 13...Clutch type joint 15...Clutch type wheel shaft 16...Bearing 17.
・Traversing wheel 18...Bearing 19...Traversing rail 20...Accelerometer 21...Stopper 22・Trolley 23・Girder 24・Travelling bogie wheel drive motor 25...Travelling bogie wheel drive chain 26・... Traveling bogie wheel drive gear 31... Traveling motor 32... Traveling brake 33... Traveling reducer 34... Anchor clamp drive device 35... Accelerometer 36... Anchor clamp 37... Traveling Trolley 3
8...Spring plate 39...Rail 40...
・Traveling trolley wheels 41...stoppers 42...
Drive shaft 43...clutch type universal joint 44...
・Clutch type wheel axle 45... Bearing 46... Traveling wheel 47... Bearing 48... Traveling rail 49... Traveling bogie wheel drive motor 50... Traveling bogie wheel drive chain 51... Traveling bogie Wheel drive gear 101...Driver's cab 101...Operation stand (8733) Agent Patent attorney Yoshiaki Inomata (and 1 other person) Inputuzu 1st En

Claims (1)

[Claims] A trolley and a girder are equipped with a traveling bogie to which a speed reducer, a motor, and a brake constituting a traversing device and a traveling device are fixed, and the traveling bogie rides on a rail provided on the trolley and girder via the wheels of the traveling bogie, A spring-loaded plate is provided on one of the wheels of the traveling bogie in parallel to the rail,
The running bogie is provided with an accelerometer, a rail clamp drive device, a rail clamp, a running bogie wheel drive motor, a running bogie wheel drive chain, and a running bogie wheel drive gear, and a traverse reduction gear provided on the running bogie. An overhead crane characterized in that the traversing wheels are connected by a drive shaft, a clutch-type joint, and a clutch-type wheel shaft.