Crane device for nuclear facilities, method for controlling lowering speed of suspended load in crane device for nuclear facilities, and emergency magnetic brake device and brake device

Abstract

To lower a suspended load quickly and safely in nuclear facilities even if the power supply to a crane is lost.SOLUTION: A device used for emergency suspension of a suspended load from an emergency battery device consists of: an emergency brake release device 14 that automatically releases a second disc brake 11b that operates during normal operation of a crane device when the power supply to the crane device is lost; and an emergency lowering auxiliary brake 13 that adjusts a lowering speed of the suspended load when the power supply to the crane device is lost. A trolley 3 installed on an upper part of a girder includes: first and second disc brakes 11a, 11b; the emergency brake release device 14; the emergency lowering auxiliary brake 13; and an emergency magnetic brake device 12 installed on a first disc brake 11a side as a backup in a case that the emergency lowering auxiliary brake 13 and the emergency brake release device 14 become unusable.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a crane apparatus for nuclear facilities, a method for controlling the speed at which a load is lowered in a crane apparatus for nuclear facilities, and an emergency magnetic brake device and brake device, and in particular to a crane apparatus for nuclear facilities that can respond to a loss of power supplied to a crane apparatus that lowers loads such as spent fuel storage containers and new fuel in nuclear facilities, a method for controlling the speed at which a load is lowered in a crane apparatus for nuclear facilities, and an emergency magnetic brake device and brake device. [Background technology]

[0002] In a crane used in a nuclear facility, if the power supply to the crane is lost for some reason, there is a risk that the crane may stop with a load such as a spent fuel storage container or new fuel suspended, and the load may not be able to be grounded for an extended period of time. This is undesirable from a safety perspective in a nuclear facility.

[0003] Therefore, in the case of crane equipment used in nuclear facilities, when the power supply is lost, the brake of the crane equipment is manually released and the equipment is stopped with a load such as a spent fuel storage container or new fuel suspended.

[0004] However, the above-mentioned manual brake release method for the crane apparatus takes a long time and is therefore not an effective means of releasing the brake of the crane apparatus in an emergency. Therefore, it is necessary to enable the rapid lowering of the suspended load, such as the spent fuel storage container or the new fuel, by means other than manual power.

[0005] On the other hand, when the brakes on the crane device are released, measures must be taken to ensure that the suspended loads, such as spent fuel storage containers and new fuel, can be lowered at a safe speed.

[0006] Patent Document 1 describes a fuel handling device for loading and unloading reactor core fuel in a nuclear power plant.

[0007] Although Patent Document 1 does not use a crane device to load or remove core fuel, it describes a fuel handling device that can reduce the number of cables without significantly affecting the workability around the fuel handling device, and that includes a traveling rail installed on the floor, a bridge that runs on the traveling rail, a traverse rail having a first rail and a second rail that are installed as a pair on the bridge, and a trolley that runs on the traverse rail, a first battery provided movably along the first rail or the second rail and detachable from the trolley; a first charging device provided on the bridge and charging the first battery; a second battery provided movably along the first rail or the second rail and detachable from the trolley; and a second charging device provided on the bridge and charging the second battery; The fuel handling device is described in which the second battery is installed on the rail between the first rail and the second rail on which the first battery is not installed, or on the same rail as the first battery, and on the opposite side of the bridge from the first battery.

[0008] On the other hand, Patent Document 2 describes an electric hoist with an emergency brake release device that can lower a suspended load in the event of a power outage.

[0009] Patent Document 2 describes an electric hoist with an emergency brake release device, which is characterized by the fact that in the event of a power outage, the brake force is released using a DC battery power source by operating the operation button switch from the ground, and the load is lowered at an almost constant speed due to mechanical loss of the brake rotor, etc., whose moment of inertia can be adjusted. The electric hoist is made up of a reduction gear, a main hoisting drum, a wire rope, a clutch, a brake rotor, a brake, a DC battery, and an operation button switch with a status display. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Publication No. 2018-25447 [Patent Document 2] Japanese Patent Application Publication No. 7-69582 Summary of the Invention [Problem to be solved by the invention]

[0011] However, when the power supply to the crane device used in the above-mentioned nuclear facility is lost and the brake of the crane device is manually released, the reducer does not start, so there is a risk that the speed at which the load is lowered cannot be controlled due to the weight of the object being lifted (e.g., spent fuel storage container, new fuel, etc.).

[0012] Therefore, with the prior art, when a crane device loses power while hanging a load such as a spent fuel storage container or new fuel from a nuclear facility, it has been difficult to quickly and safely lower the load, and the above-mentioned Patent Documents 1 and 2 do not disclose any solutions to the above-mentioned problems.

[0013] The present invention has been made in consideration of the above points, and a first object thereof is to provide a crane apparatus for use in a nuclear facility that can quickly and safely lower a suspended load, such as a spent fuel storage container or new fuel at a nuclear facility, even if the power supply to the crane apparatus is lost when the crane apparatus is used to lower the suspended load.

[0014] A second object of the present invention is to provide a method for controlling the speed at which a load is lowered in a crane apparatus for use in nuclear facilities, which is capable of controlling the speed at which a load is lowered.

[0015] A third object of the present invention is to provide an emergency magnetic brake device that can be used in combination with the above-mentioned crane device for nuclear facilities and that can control the hoisting speed of a load in the above-mentioned crane device for nuclear facilities. [Means for solving the problem]

[0016] In order to achieve the first object described above, the crane apparatus for nuclear facilities of the present invention comprises a girder, a trolley installed on the upper part of the girder, and a normal power supply control device and an emergency battery device built into the inside of the girder, and is capable of traveling on a traveling rail by a girder traveling wheel installed on the girder, A crane apparatus for use in a nuclear facility that suspends and transports equipment for the nuclear facility by supplying power from the normal power supply control device to at least a crane drive device during normal operation of the crane apparatus, and supplying power from the emergency battery device to a device used for emergency suspension of a suspended load when a power supply that supplies power to the crane apparatus is lost, The device used for emergency suspension of the load from the emergency battery device comprises an emergency brake release device that automatically releases a second disc brake that operates during normal operation of the crane device when power to the crane device is lost, and an emergency lowering auxiliary brake that adjusts the suspension speed of the load when power to the crane device is lost, The trolley is characterized by being equipped with at least first and second disc brakes, the emergency brake release device, the emergency lowering auxiliary brake, and an emergency magnetic brake device installed on the first disc brake side and serving as a backup in case the emergency lowering auxiliary brake and the emergency brake release device become unusable.

[0017] In addition, in order to achieve the second object described above, the method for controlling the hoisting speed of a load in a crane apparatus for nuclear facilities of the present invention comprises a girder, a trolley installed on the upper part of the girder, and a normal power supply control device and an emergency battery device built into the inside of the girder, and is capable of traveling on a traveling rail by a girder traveling wheel installed on the girder, During normal operation of the crane apparatus, power is supplied from the normal power supply control device to at least the crane drive device, and when the power supply supplied to the crane apparatus is lost, power is supplied from the emergency battery device to a device used for emergency suspension of the load, thereby controlling the hoisting speed of the load in a crane apparatus for use in suspending and transporting equipment for nuclear facility, The device used for emergency suspension of the load from the emergency battery device comprises an emergency brake release device that automatically releases a second disc brake that operates during normal operation of the crane device when power to the crane device is lost, and an emergency lowering auxiliary brake that adjusts the suspension speed of the load when power to the crane device is lost, The trolley is equipped with first and second disc brakes that operate during normal operation of the crane device, the emergency brake release device, the emergency hoisting-down auxiliary brake, a reducer, an emergency centrifugal limit switch, and a main hoisting drum, The emergency centrifugal limit switch measures the rotation speed of the main hoist drum to detect the lowering speed of the load, and if the lowering speed of the load is faster than a preset speed, the emergency lowering auxiliary brake is activated to reduce the lowering speed of the load to the set speed.

[0018] In order to achieve the third object, the emergency magnetic brake device of the present invention comprises a second disc brake that automatically operates during normal operation of the crane device when power to the crane device is lost, and two emergency magnetic brake pads that are installed so as to sandwich the second brake disc at a predetermined interval, The two emergency magnetic brake pads are equipped with magnets, and the number of magnets is adjusted or the distance between the emergency magnetic brake pads and the second brake disc is adjusted to control the rotation speed of the main hoisting drum and the hoisting speed of the load. [Effects of the Invention]

[0019] According to the present invention, when a crane is used to lower a suspended load such as a spent fuel storage container or new fuel at a nuclear facility, even if the power supply to the crane is lost, the load can be lowered quickly and safely, and the load lowering speed can be controlled. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a schematic configuration diagram showing a first embodiment of a crane apparatus for a nuclear facility according to the present invention. [Figure 2] 1 is a plan view showing a schematic configuration of a trolley in a crane apparatus for a nuclear facility according to a first embodiment of the present invention. FIG. [Figure 3] 1 is a diagram showing a schematic configuration of a disk brake and an emergency magnetic brake in a crane apparatus for a nuclear facility according to a first embodiment of the present invention, illustrating a state in which the brake is released. FIG. [Figure 4] FIG. 1 shows a schematic configuration of a disc brake, an emergency brake release device, and an emergency lowering auxiliary brake in a crane apparatus for a nuclear facility according to a first embodiment of the present invention, and is a diagram showing a state during braking. [Figure 5] 1 is a diagram showing a detailed configuration of a part of an emergency brake release device in a crane apparatus for a nuclear facility according to a first embodiment of the present invention. FIG. [Figure 6(a)] 1 is a diagram showing a schematic configuration of a part of an emergency magnetic brake in a crane apparatus for a nuclear facility according to a first embodiment of the present invention. FIG. [Figure 6(b)] FIG. 6(a) is a side view of FIG. [Figure 7(a)] FIG. 2 shows a detailed configuration of an emergency magnetic brake in the crane apparatus for a nuclear facility according to the first embodiment of the present invention, illustrating a state in which the magnet is attached. [Figure 7(b)] FIG. 7(b) is a side view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0021] The crane apparatus for nuclear facilities, the method for controlling the speed of hoisting a load in the crane apparatus for nuclear facilities, and the emergency magnetic brake device of the present invention will be described below based on the illustrated embodiments. Note that the same reference numerals are used for the same components in each drawing. [Example]

[0022] FIG. 1 shows a first embodiment of a crane apparatus 100 for use in a nuclear facility according to the present invention.

[0023] The nuclear facility crane apparatus 100 of this embodiment shown in the figure has a traveling rail 2 installed under the girder 1, and is configured so that the nuclear facility crane apparatus 100 can travel on this traveling rail 2 in the left-right direction in Figure 1. The nuclear facility crane apparatus 100 also has reducers 6a, 6b and a main hoist drum 7, and the hook 5 can be hoisted up and down using these reducers 6a, 6b and the main hoist drum 7.

[0024] Furthermore, the crane device 100 for nuclear facilities in this embodiment is equipped with a girder 1, and a normal power supply control device 8 and an emergency battery device 9 are built into the inside of this girder 1. The crane device 100 for nuclear facilities can travel in the left and right directions in Figure 1 by traveling on the traveling rails 2 using the girder traveling wheels 1a installed on the girder 1.

[0025] In addition, the emergency battery device 9 is configured to be constantly charged from the normal power supply control device 8 during normal operation of the nuclear facility crane device 100, and is capable of supplying power to the emergency motor 26 described below.

[0026] The nuclear facility crane apparatus 100 of this embodiment is also provided with a trolley 3, and this trolley 3 is structured so as to be able to travel laterally on a traverse rail 4.

[0027] As shown in FIG. 2, the trolley 3 is equipped with reducers 6a and 6b, a main hoist drum 7, an electric motor 10 which is a crane drive device, first and second disc brakes 11a and 11b, an emergency magnetic brake device 12, an emergency hoisting auxiliary brake 13, an emergency brake release device 14, and an emergency centrifugal limit switch 15.

[0028] During normal operation of the nuclear facility crane device 100, the electric motor 10 is operated using power supplied from the normal power supply control device 8, and the first and second disc brakes 11a and 11b, the main hoisting drum 7, and the reducers 6a and 6b are operated to use the hook 5 to hoist and lower suspended loads such as spent fuel storage containers and new fuel.

[0029] The normal power supply control device 8 mainly supplies power to the electric motor 10, which is the crane driving device, but also supplies power to lighting, etc., so it can be said that the normal power supply control device 8 supplies power to at least the crane driving device (electric motor 10).

[0030] In addition, when the power supply to the nuclear facility crane device 100 is lost, the emergency brake release device 14 is activated using power supplied from the emergency battery device 9, making it possible to release the second disc brake 11b that has been applied.

[0031] Furthermore, an emergency centrifugal limit switch 15 is installed on the side of the reducer 6b, and this emergency centrifugal limit switch 15 can measure the rotation speed of the main hoisting drum 7 and detect the hoisting speed of the load.

[0032] If the load lowering speed detected by the emergency centrifugal limit switch 15 is faster than the preset load lowering speed, the emergency lowering auxiliary brake 13 is activated to reduce the load lowering speed to the set speed, thereby making it possible to lower the load at a speed equal to or slower than the set speed.

[0033] In addition, the emergency magnetic brake device 12 serves as a backup in the event that the emergency lowering auxiliary brake 13 and the emergency brake release device 14 become unusable, and is composed of a second brake disc 17b (see Figure 3) and two emergency magnetic brake pads 22a and 22b (see Figure 3) that are installed so as to sandwich this second brake disc 17b at a predetermined distance. After magnets 33 (see Figures 7(a) and 7(b)) are attached to the emergency magnetic brake pads 22a and 22b, the number of magnets 33 can be adjusted or the distance between the emergency magnetic brake pads 22a and 22b and the second brake disc 17b can be adjusted to control the rotational speed of the main hoisting drum 7 and the speed at which the load is lowered.

[0034] Furthermore, after the brake is released when power is lost to the crane apparatus 100 for nuclear facilities, the second brake disc 17b, which is sandwiched between the emergency magnetic brake pads 22a and 22b and fixed coaxially with the second disc brake 11b that operates during normal operation of the crane apparatus 100 for nuclear facilities, rotates to generate electromagnetic induction, which generates a braking force against the lowering of the load, thereby making it possible to control the lowering speed of the load.

[0035] In addition, the second brake disc 17b is fixed to the drive shaft 16 and rotates together with the drive shaft 16, but the emergency magnetic brake pads 22a and 22b are fixed to a part other than the drive shaft 16 (a non-rotating part such as the electric motor 10 or the first disc brake 11a), and the emergency magnetic brake pads 22a and 22b do not rotate.

[0036] Figure 3 shows the schematic configuration of the first disc brake 11a and emergency magnetic brake device 12 shown in Figure 2, Figure 4 shows the schematic configuration of the second disc brake 11b, emergency lowering auxiliary brake 13 and emergency brake release device 14, Figure 5 shows the detailed configuration of part of the emergency brake release device 14, and Figures 6(a), 6(b) and 7(a), 7(b) show the schematic configuration of the emergency magnetic brake device 12.

[0037] As shown in Figure 3, the first disc brake 11a is roughly composed of a drive shaft 16 directly connected to the electric motor 10, a first brake disc 17a rotatably fixed to the drive shaft 16, first and second brake shoes 18a and 18b that apply braking force to the first brake disc 17a, first and second brake shoe levers 19a and 19b that hold the first and second brake shoes 18a and 18b at one end, a main spindle 20 whose one end is rotatably supported on the other end of the second brake shoe lever 19b, and an L-shaped brake lever 21 whose L-shaped tip portion is rotatably supported on the other end of the main spindle 20 and whose L-shaped bent portion is rotatably supported on the other end of the first brake shoe lever 19a.

[0038] As shown in Figures 4 and 5, the emergency brake release device 14 is roughly composed of an emergency motor 26, a drive shaft 25 having one end connected to the emergency motor 26, a spur gear 24 fixed to the other end of the drive shaft 25, and a rack 23 connected to the spur gear 24 so as to be able to move in a linear manner.

[0039] As shown in FIG. 4, the emergency lowering auxiliary brake 13 is generally composed of first and second emergency brake shoes 27a and 27b that apply a braking force to the second brake disc 17b that is rotatably fixed to the drive shaft 16 that is directly connected to the electric motor 10, first and second emergency brake shoe levers 28a and 28b that have the first and second emergency brake shoes 27a and 27b fixed to one end, an emergency main spindle 29 that is rotatably supported on the other end of the first emergency brake shoe lever 28a, and an L-shaped emergency brake lever 30 whose L-shaped tip portion is rotatably supported on the other end of the emergency main spindle 29 and whose L-shaped bent portion is rotatably supported on the other end of the second emergency brake shoe lever 28b.

[0040] Also, as shown in Figures 6(a), 6(b) and 7(a) and 7(b), the emergency magnetic brake pads 22a and 22b are composed of an anti-crack disc 31 and a plurality of magnet mounting slots 32 pre-formed in the anti-crack disc 31.

[0041] 6(a) and 6(b) show the anti-crack disc 31 before the magnets 33 are attached, and since the magnets 33 are not attached to the multiple magnet attachment slots 32, no braking force is generated.

[0042] On the other hand, as shown in Figures 7(a) and 7(b), two anti-crack discs 31 shown in Figures 6(a) and 6(b) are combined to form approximately circular emergency magnetic brake pads 22a and 22b.

[0043] Magnets 33 are attached to multiple magnet mounting slots 32 formed in the anti-crack disc 31 of these emergency magnetic brake pads 22a and 22b (in Figure 7(a) magnets 33 are attached to four locations of the magnet mounting slots 32).

[0044] In an emergency (power loss) of the nuclear facility crane device 100, the rotational speed of the main hoisting drum 7 and the hoisting speed of the load can be controlled by adjusting the number of magnets 33 attached to the multiple magnet mounting slots 32 or by adjusting the distance between the emergency magnet brake pads 22a and 22b and the second brake disc 17b.

[0045] Furthermore, the emergency magnetic brake pads 22a and 22b are of a half-split shape and do not come into contact with the drive shaft 16 on which the second brake disc 17b is mounted (see Figure 7(a)), which has the advantage that they can be added to crane equipment that is already in operation.

[0046] Next, the operation of hoisting and lowering a load in the crane apparatus 100 for nuclear facilities of this embodiment will be described.

[0047] During normal operation of the crane equipment 100 for nuclear facilities, the emergency brake release device 14, the emergency lowering auxiliary brake 13, and the emergency magnetic brake device 12 are not activated, so as not to affect the operation of the crane equipment 100 for nuclear facilities.

[0048] In addition, the first disc brake 11a is released by lifting the brake lever 21 (from the dotted line to the solid line in Figure 3), which pushes the main spindle 20 and applies force in the direction in which the first and second brake shoe levers 19a and 19b open (in the direction of the arrow in Figure 3), causing the first and second brake shoes 18a and 18b to open.This releases the first brake disc 17a, making it possible to hoist and lower the load.

[0049] On the other hand, when power is lost to the crane apparatus 100 for nuclear facilities, the brake is applied. At that time, the emergency motor 26 of the emergency brake release device 14 shown in Fig. 4 is started, and the drive shaft 25 connected to the emergency motor 26 and the spur gear 24 fixed to the drive shaft 25 rotate, pulling the rack 23 in the direction of the arrow, and enabling the braked first brake disc 17a to be released (the state shown in Fig. 3).

[0050] Furthermore, when the power supply to the nuclear facility crane apparatus 100 is lost and the speed at which the load is lowered is controlled, as shown in FIG. 4, the emergency brake lever 30 of the emergency lowering auxiliary brake 13 is lowered in the direction of the arrow, and the emergency main spindle 29 is pulled in the direction of the arrow by the force of a lever, so that the first and second emergency brake shoe levers 28a and 28b are pressed in the closing direction (the direction of the arrow), and the first and second emergency brake shoes 27a and 27b apply the brakes to the second disc brake 17b, thereby making it possible to control the speed at which the load is lowered.

[0051] According to this embodiment, when lowering a suspended load such as a spent fuel storage container or new fuel at a nuclear facility using the nuclear facility crane apparatus 100 of this embodiment described above, even if the power supply to the nuclear facility crane apparatus 100 is lost, the suspended load can be lowered quickly and safely, and the lowering speed of the suspended load can be controlled.

[0052] Furthermore, although not specifically illustrated or described, the crane device may be equipped with a first brake that operates during normal operation of the crane device and when power is lost, and a second brake that operates when power is lost to the crane device, and one of the first and second brakes may be a brake device with weak holding force when activated.

[0053] For example, the first brake corresponds to the first disc brake 11a, and the second brake corresponds to the emergency magnetic brake device 12.

[0054] The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations. [Explanation of symbols]

[0055] 1... girder, 1a... girder travel wheel, 2... travel rail, 3... trolley, 4... traverse rail, 5... hook, 6a, 6b... reducer, 7... main hoist drum, 8... normal power supply control device, 9... emergency battery device, 10... electric motor, 11a... first disc brake, 11b... second disc brake, 12... emergency magnetic brake device, 13... emergency hoisting down auxiliary brake, 14... emergency brake release device, 15... emergency centrifugal limit switch, 16, 25... drive shaft, 17a... first brake disc, 17b... second brake disc, 18a... first brake shoe, 18b... second brake Shoe, 19a...first brake shoe lever, 19b...second brake shoe lever, 20...main spindle, 21...brake lever, 22a, 22b...emergency magnetic brake pad, 23...rack, 24...spur gear, 26...emergency motor, 27a...first emergency brake shoe, 27b...second emergency brake shoe, 28a...first emergency brake shoe lever, 28b...second emergency brake shoe lever, 29...emergency main spindle, 30...emergency brake lever, 31...anti-crack disc, 32...slot for mounting magnet, 33...magnet, 100...crane equipment for nuclear equipment.

Claims

1. The girder is equipped with a trolley installed on the upper part of the girder, and a normal power supply control device and an emergency battery device built into the inside of the girder. The girder can run on a running rail by a girder running wheel installed on the girder. A crane apparatus for use in a nuclear facility, which suspends and transports equipment for a nuclear facility, by supplying power from the normal power supply control device to at least a crane driving device during normal operation of the crane apparatus, and supplying power from the emergency battery device to a device used for suspending a suspended load in an emergency when a power supply supplying power to the crane apparatus is lost, The device used for emergency suspension of the load from the emergency battery device comprises an emergency brake release device that automatically releases a second disk brake that operates during normal operation of the crane device when power is lost for the crane device, and an emergency lowering auxiliary brake that adjusts the suspension speed of the load when power is lost for the crane device, said trolley is equipped with at least first and second disc brakes, said emergency brake release device, said emergency lowering auxiliary brake, and an emergency magnetic brake device installed on the first disc brake side and serving as a backup in case said emergency lowering auxiliary brake and said emergency brake release device become unusable.

2. The crane apparatus for a nuclear facility according to claim 1, The trolley further includes a reducer, a main hoist drum, and an emergency centrifugal limit switch; a rotation speed of the main hoist drum is measured by the emergency centrifugal limit switch to detect a hoisting speed of the load, and if the hoisting speed of the load is faster than a preset speed, the emergency hoisting auxiliary brake is activated to reduce the hoisting speed of the load to the set speed.

3. The crane apparatus for a nuclear facility according to claim 1, When power to the crane apparatus is lost, the second disc brake is released by activating the emergency brake release device using power supplied from the emergency battery device.

4. The crane apparatus for a nuclear facility according to claim 2, During normal operation of the crane apparatus, the crane drive device is operated using power supplied from the normal power supply control device, and the first and second disc brakes, the main hoist drum, and the reducer are operated, thereby enabling the hoisting and lowering of the load.

5. The crane apparatus for a nuclear facility according to claim 2, The emergency magnetic brake device is composed of a brake disc and two emergency magnetic brake pads arranged to sandwich the brake disc at a predetermined interval, A crane apparatus for nuclear facilities, characterized in that magnets are attached to the two emergency magnet brake pads, and the number of magnets is adjusted or the distance between the emergency magnet brake pads and the brake disc is adjusted to control the rotational speed of the main hoisting drum and control the hoisting speed of the load.

6. The crane apparatus for a nuclear facility according to claim 5, 1. A crane apparatus for use in a nuclear facility, wherein the brake disc rotates together with the drive shaft, and the emergency magnetic brake pad is fixed to something other than the drive shaft and does not rotate.

7. The crane apparatus for a nuclear facility according to claim 1, the first disc brake comprises: a drive shaft directly connected to the crane drive device; a first brake disc rotatably fixed to the drive shaft; first and second brake shoes for applying a braking force to the first brake disc; first and second brake shoe levers for holding the first and second brake shoes at one end; a main spindle having one end rotatably supported on the other end of the second brake shoe lever; and a brake lever formed in an L-shape, the tip portion of the L-shape being rotatably supported on the other end of the main spindle and the bent portion of the L-shape being rotatably supported on the other end of the first brake shoe lever, This crane apparatus for nuclear facilities is characterized in that the first disc brake is released by lifting the brake lever, pushing the main spindle, and applying a force in a direction in which the first and second brake shoe levers open, causing the first and second brake shoes to open, thereby releasing the first brake disc and enabling the load to be hoisted or lowered.

8. The crane apparatus for a nuclear facility according to claim 1, The emergency brake release device is composed of an emergency motor, a drive shaft having one end connected to the emergency motor, a spur gear fixed to the other end of the drive shaft, and a rack connected to the spur gear so as to be linearly movable, When power to the crane apparatus is lost, the emergency motor of the emergency brake release device is started, and the drive shaft and the spur gear 24 rotate, thereby pulling the rack and releasing the first brake disc that has been braked. This crane apparatus for nuclear facilities is characterized in that

9. The crane apparatus for a nuclear facility according to claim 1, The emergency lowering auxiliary brake is composed of first and second emergency brake shoes that apply a braking force to a second brake disc rotatably fixed to a drive shaft directly connected to the crane drive device, first and second emergency brake shoe levers that are fixed to one ends of the first and second emergency brake shoes, an emergency main spindle that is rotatably supported on the other end of the first emergency brake shoe lever, and an emergency brake lever that is formed in an L-shape, the tip portion of the L-shape being rotatably supported on the other end of the emergency main spindle and the bent portion of the L-shape being rotatably supported on the other end of the second emergency brake shoe lever, A crane apparatus for nuclear facilities, characterized in that, when controlling the lowering speed of the load when power is lost, the emergency brake lever of the emergency lowering auxiliary brake is lowered, thereby pulling the emergency main spindle with a lever force, pressing the first and second emergency brake shoe levers in a closing direction, and the first and second emergency brake shoes apply the brakes to the second disc brake, thereby controlling the lowering speed of the load.

10. The crane apparatus for a nuclear facility according to claim 5, The emergency magnet brake pad is composed of a split disk and a plurality of magnet mounting slots formed in advance on the split disk, and two split disks are combined to form the emergency magnet brake pad having a substantially circular shape; A crane apparatus for nuclear power facilities, characterized in that the magnets are attached to a plurality of magnet attachment slots formed in the anti-crack disk of the emergency magnet brake pad.

11. The girder is equipped with a trolley installed on the upper part of the girder, and a normal power supply control device and an emergency battery device built into the inside of the girder. The girder can run on a running rail by a girder running wheel installed on the girder. During normal operation of the crane apparatus, power is supplied from the normal power supply control device to at least the crane drive device, and when the power supply supplied to the crane apparatus is lost, power is supplied from the emergency battery device to a device used for emergency suspension of a suspended load, thereby controlling the hoisting speed of a suspended load in a crane apparatus for use in suspending and transporting equipment for a nuclear facility, The device used for emergency suspension of the load from the emergency battery device comprises an emergency brake release device that automatically releases a second disk brake that operates during normal operation of the crane device when power is lost for the crane device, and an emergency lowering auxiliary brake that adjusts the suspension speed of the load when power is lost for the crane device, The trolley is equipped with first and second disc brakes that operate during normal operation of the crane apparatus, the emergency brake release device, the emergency lowering auxiliary brake, an emergency magnetic brake device that is installed on the first disc brake side and serves as a backup in case the emergency lowering auxiliary brake and the emergency brake release device become unusable, a reducer, an emergency centrifugal limit switch, and a main hoist drum, A method for controlling the hoisting speed of a load in a crane apparatus for nuclear facilities, characterized in that the emergency centrifugal limit switch measures the rotational speed of the main hoist drum to detect the hoisting speed of the load, and if the hoisting speed of the load is faster than a preset speed, the emergency hoisting auxiliary brake is activated to decelerate the hoisting speed of the load to the set speed.

12. A method for controlling a load hoisting speed in a crane apparatus for a nuclear facility according to claim 11, comprising: The emergency magnetic brake device is composed of a brake disc and two emergency magnetic brake pads arranged to sandwich the brake disc at a predetermined interval, A method for controlling the hoisting speed of a load in a crane apparatus for nuclear facilities, characterized in that magnets are attached to the two emergency magnet brake pads, and the number of magnets is adjusted or the distance between the emergency magnet brake pads and the brake disc is adjusted to control the rotational speed of the main hoisting drum and control the hoisting speed of the load.

13. A method for controlling a load hoisting speed in a crane apparatus for a nuclear facility according to claim 11, comprising: The emergency lowering auxiliary brake is composed of first and second emergency brake shoes that apply a braking force to a second brake disc rotatably fixed to a drive shaft directly connected to the crane drive device, first and second emergency brake shoe levers that are fixed to one ends of the first and second emergency brake shoes, an emergency main spindle that is rotatably supported on the other end of the first emergency brake shoe lever, and an emergency brake lever that is formed in an L-shape, the tip portion of the L-shape being rotatably supported on the other end of the emergency main spindle and the bent portion of the L-shape being rotatably supported on the other end of the second emergency brake shoe lever, A method for controlling the lowering speed of a suspended load in a crane apparatus for a nuclear facility, characterized in that, when controlling the lowering speed of the suspended load when power is lost in the crane apparatus, the emergency brake lever of the emergency lowering auxiliary brake is lowered, thereby pulling the emergency main spindle with a lever force, pressing the first and second emergency brake shoe levers in a closing direction, and the first and second emergency brake shoes apply the brakes to the second disc brake, thereby controlling the lowering speed of the suspended load.

14. The brake disc is automatically activated during normal operation of the crane equipment when the power supply to the crane equipment is lost, and two emergency magnetic brake pads are installed so as to sandwich the brake disc at a predetermined interval. An emergency magnetic brake device characterized in that magnets are attached to the two emergency magnetic brake pads, and the number of magnets is adjusted or the distance between the emergency magnetic brake pads and the brake disc is adjusted to control the rotational speed of the main hoisting drum and control the hoisting speed of the load.

15. 15. The emergency magnetic brake device according to claim 14, An emergency magnetic brake device, characterized in that the brake disc rotates together with the drive shaft, and the emergency magnetic brake pad is fixed to something other than the drive shaft and does not rotate.

16. 16. The emergency magnetic brake device according to claim 15, The emergency magnet brake pad is composed of a split disk and a plurality of magnet mounting slots formed in advance on the split disk, and two split disks are combined to form the emergency magnet brake pad having a substantially circular shape; An emergency magnetic brake device, characterized in that the magnets are attached to a plurality of magnet mounting slots formed in the anti-crack disc of the emergency magnetic brake pad.

17. A first brake is provided which operates during normal operation of the crane device and when a power supply is lost, and a second brake is provided which operates when a power supply is lost to the crane device, A brake device, wherein one of the first and second brakes has a weak holding force when the brake is activated.

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