JP2021031216A - Crane device and adjustment method of braking force - Google Patents

Abstract

To provide a crane device capable of suppressing cutting or damaging of a wire rope and capable of restraining cost increase of the wire rope by configuring the wire rope so that tension exceeding the allowable load does not act thereon.SOLUTION: A crane device 1 comprises a motor 40 with an electromagnetic brake to wind up a wire rope 3 with a suspended load M suspended at one end. The motor 40 comprises a braking part 2 to apply a braking force to the wire rope 3 according to the magnitude of the load transmitted from the wire rope 3. The braking force of the braking part 2 is the motor driving force or above and the wire rope allowable load or below.SELECTED DRAWING: Figure 1

Description

The present invention relates to a crane device and a method for adjusting a brake braking force.

Conventionally, as a crane device, for example, as shown in Patent Document 1, a device provided with a wire rope load fluctuation reducing device for reducing the impact stress of the wire rope due to the load fluctuation applied by reducing the load fluctuation applied to the wire rope. It has been known.

Patent Document 1 is configured to lift a heavy object by winding a wire rope with a heavy object suspended at one end via a sheave by a hoisting device, and the action of a bearing load of the sheave transmitted from the wire rope. It is equipped with a hydraulic device that generates hydraulic pressure by means of a hydraulic system and a hydraulic fluctuation absorbing device that is connected to the hydraulic system to attenuate the fluctuation of the hydraulic pressure. Described is a crane equipped with a wire rope load fluctuation reduction device configured to dampen wire rope load fluctuations by absorbing the fluctuations.

Japanese Unexamined Patent Publication No. 2005-170668

However, with the conventional crane device as described in Patent Document 1, it is possible to reduce the load fluctuation of the wire rope that occurs when lifting a heavy object, but it corresponds to the case where the input seismic level is large. It's not a thing. That is, in the conventional crane device, for example, when the suspended load is lifted and stopped, when the input earthquake level becomes large, the suspended load is lifted as if it jumps, and when the wire rope is loosened and then dropped, the wire rope is stretched. A large impact tension is generated on the wire rope. Such a large impact tension at the time of dropping exceeds the allowable load of the wire rope, and there is a possibility that the wire rope may be cut or damaged.
Therefore, in order to deal with the cutting or damage of the wire rope, it is necessary to adopt a wire rope with a larger allowable load, which causes a problem of increased cost, and there is room for improvement in that respect. It was.

The present invention has been made in view of the above-mentioned problems, and by adopting a configuration in which a tension exceeding an allowable load does not act on the wire rope, cutting or damage of the wire rope can be suppressed, and the cost of the wire rope can be reduced. It is an object of the present invention to provide a crane device capable of suppressing an increase and a method for adjusting a brake braking force.

In order to achieve the above object, the crane device according to one aspect of the present invention is a crane device including a motor with an electromagnetic brake that winds up a wire rope with a heavy object suspended at one end, and the motor is the above-mentioned. A brake braking unit that applies a brake braking force to the wire rope according to the magnitude of the load transmitted from the wire rope is provided, and the brake braking force of the brake braking unit is equal to or greater than the motor driving force and less than or equal to the allowable wire rope load. It is characterized by being.

According to the crane device according to the above aspect, when a tension exceeding the permissible load acts on the wire rope, such as when a drop impact occurs after the suspended load suspended by the wire rope is once lifted at the time of an earthquake, the wire The rope can be displaced in the falling direction along with the suspended load. That is, the brake braking force operating in the brake braking portion can be reduced to slide the wire rope and feed out the wire rope. At this time, since the brake braking force of the brake braking portion is set to be equal to or greater than the motor driving force and equal to or less than the allowable load of the wire rope, tension exceeding the allowable value does not act on the wire rope delivered in the falling direction, and the wire It is possible to suppress the cutting and damage of the rope and to suppress the increase in the cost of the wire rope.
Further, in the present invention, by setting the wire rope allowable load or less in the brake braking portion, when the wire rope is unwound in the falling direction, the wire rope is wound up by the amount unwound after the earthquake to be in the state before the earthquake. It can be restored.

Further, in the above-mentioned crane device, the brake braking portion includes an armature supported by the motor shaft of the motor, a disc that comes into contact with the armature to generate the brake braking force, and the disc that elastically forms the armature. The brake braking portion includes a pressing spring that presses toward the side, and the pressing spring has a configuration in which the disc is pressed by the armature to generate a brake braking force on the wire rope. It is preferable that a spring force adjusting member for adjusting the spring force of the pressing spring is provided.

According to such a configuration, when the armature is attracted to the coil side of the motor against the compressive force of the pressing spring while the brake power is on, a gap is created between the armature and the disc to release the brake. Alternatively, the frictional force becomes smaller and the braking force is reduced. When the brake power is turned off, the armature is pushed back in the direction opposite to the direction of suction by the spring force of the pressing spring, the armature presses the disc, and the friction torque controls the brake on the wire rope. Power can be applied.
At this time, since the spring force of the pressing spring can be adjusted by the spring force adjusting member, the distance between the armature and the disc can be adjusted in the initial state when the armature is being sucked. For example, it is possible to adjust so that a braking force of about half is applied between the armature and the disc in the initial state.

The brake braking force adjusting method according to another aspect of the present invention is in contact with an armature supported by the motor shaft of a motor equipped with an electromagnetic brake that winds up a wire rope with a heavy object suspended at one end, and the armature. A method for adjusting a brake braking force using a disc that generates a brake braking force and a crane device having a brake braking portion provided with the disc, and the attractive force of a brake electromagnetic magnet that attracts the armature in a direction away from the disc. The step of sliding the wire rope at the brake braking part with half the action and half the braking force, and reducing the suction force of the armature when the wire rope no longer slips at the brake braking part. It is characterized by having a step of reducing the braking force.

According to the brake braking force adjusting method according to the above aspect, by setting the suction force of the brake electromagnetic magnet to be half acted, the brake braking force is also halved, and the wire rope brake is intentionally slid by the motor. Can be. Since the attractive force at this time is proportional to the value of the current flowing through the electromagnet, it can be easily controlled by halving the current.
Then, when the wire rope does not slip in the brake braking portion, the brake braking force is too large. Therefore, the brake is adjusted so that the wire rope slips by reducing the brake braking force. Brake As a specific adjustment method to reduce the braking force, the elastic force that presses the armature against the disc is changed. For example, by attaching a spring force adjusting screw in the direction of elastic deformation, the braking force can be easily adjusted, cutting and damage of the wire rope can be suppressed, and the cost increase of the wire rope can be suppressed. Can be done.

According to the crane device and the brake braking force adjusting method of the present invention, the wire rope is configured so that a tension exceeding the allowable load does not act on the wire rope, thereby suppressing cutting or damage of the wire rope and increasing the cost of the wire rope. Can be suppressed.

It is a side view which showed the schematic structure of the crane device by embodiment of this invention. It is a figure which shows typically the braking structure of the motor provided in the crane device shown in FIG. 1, (a) is a figure which shows the state when a brake is released, and (b) is a figure which shows the state when a brake is operated. ..

Hereinafter, the crane device and the brake braking force adjusting method according to the embodiment of the present invention will be described with reference to the drawings. Such an embodiment shows one aspect of the present invention, does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention.

As shown in FIG. 1, the crane device 1 according to the present embodiment is applied to an overhead crane provided near the ceiling for lifting a heavy load M, for example, in a factory or the like. Specifically, the crane device 1 includes a plate-shaped base 11 that moves on a traveling rail (not shown) provided on a ceiling slab or a beam material fixed near the ceiling of the building.

The crane device 1 includes a take-up device 4 provided with a brake braking portion 2 and capable of unwinding the wire rope 3, and a plurality of (here, two) pulleys 5A and 5B around which the wire rope 3 of the take-up device 4 is wound. And wire rope restoration that automatically restores the displacement of the wire rope 3 in the falling direction from the pulley (here, the second pulley 5B) located most downstream in the wire rope feeding direction (wire rope feeding direction E1). The device 6 and the like are provided.
Here, the direction in which the wire rope 3 is wound by the winding device 4 with respect to the wire rope feeding direction E1 is referred to as the wire rope winding direction E2.

Of the two pulleys 5A and 5B, the first pulley 5A and the second pulley 5B are in the order of the wire rope feeding direction E1. The first pulley 5A is rotatably fixed to the lower surface 11b of the base 11 via the bracket 51. The second pulley 5B is rotatably fixed to the support frame 52 fixed on the base 11 above the base 11 via the wire rope restoring device 6.

The support frame 52 is connected to a pair of columns 53, 53 that are erected on the upper surface 11a of the base 11 and arranged at intervals from each other, and a beam member 54 that connects the upper ends of the columns 53, 53 to each other. It is structured in a pattern. A wire rope restoration device 6 is fixed to the lower surface of the beam member 54, and a second pulley 5B is fixed to the lower end of the wire rope restoration device 6.

The wire rope restoration device 6 allows the wire rope 3 to be displaced in the falling direction together with the suspended load M when a tension exceeding the allowable load is applied to the wire rope 3. That is, although the suspended load is displaced in the falling direction, it can be automatically restored by the wire rope restoring device 6, and a spring (a spring described later) is used so that the wire rope 3 is not displaced at normal times when the above allowable load is not exceeded. The member 64) has an initial tension set.
The wire rope restoration device 6 is configured to change the position of the second pulley 5B that guides the wire rope 3, and since the second pulley 5B is moved, the displacement of the wire rope 3 is twice the amount of movement of the second pulley 5B. It will occur at the lower end of the wire rope (wire rope tip 3a).

The wire rope restoration device 6 includes a storage case 61, a sliding plate 62 that can slide in the vertical direction Y in the storage case 61, and a lower wall 61A of the storage case 61 that extends downward from the lower surface 62a of the sliding plate 62. A connecting rod 63 penetrating the sliding plate 62 and a spring member 64 arranged between the lower wall 61A and the sliding plate 62 and urging the sliding plate 62 upward are provided.

The storage case 61 is formed in a bottomed tubular shape having a lower wall 61A and a side wall 61B provided on the entire outer circumference of the lower wall 61A. The upper end of the side wall 61B is fixed to the lower surface of the beam member 54 of the support frame 52 by an appropriate fixing means such as bolt fastening or welding. A through hole 63a penetrating in the thickness direction is formed in the center of the lower wall 61A of the storage case 61, and the connecting rod 63 can be inserted through the through hole 63a. The accommodating case 61 accommodates the sliding plate 62 and the spring member 64.

The sliding plate 62 sandwiches the spring member 64 in the accommodation case 61 with the lower wall 61A of the accommodation case 61 in the vertical direction Y, and can move in the vertical direction Y along the inner peripheral surface of the side wall 61B. It is provided. The upper end of the spring member 64 is in contact with the lower surface 62a of the sliding plate 62. The sliding plate 62 slides in the vertical direction Y as the spring member 64 expands and contracts.

The connecting rod 63 is formed in a rod shape extending in the vertical direction Y, extends downward from the lower surface 62a of the sliding plate 62, penetrates the through hole 61a of the lower wall 61A of the accommodating case 61, and further lower than the lower wall 61A. It extends and linearly moves in the vertical direction with respect to the accommodating case 61 together with the sliding plate 62 so as to expand and contract the spring member 64. The rotating shaft 5a of the second pulley 5B is connected to the lower end 63a of the connecting rod 63. The second pulley 5B is rotatably connected to the lower end 63a of the connecting rod 63, and is provided so as to be movable in the vertical direction Y together with the connecting rod 63.

As the spring member 64, for example, a coil spring that can be elastically expanded and contracted and deformed is adopted. The spring member 64 is housed in the storage case 61 so that the storage case 61 and the spring member 64 are coaxial with each other, and can be elastically expanded and contracted in the vertical direction Y in the storage case 61. The spring constant of the spring member 64 is set in consideration of the increase in tension of the wire rope 3 due to the spring restoring force.

In the normal state where the set allowable load is not reached, a downward load acts on the sliding plate 62 via the connecting rod 63 in the initial state in which the spring member 64 is not compressed and deformed (the state in which the spring member 64 is fully extended). Not done. When a downward load exceeding the allowable load acts on the sliding plate 62, the spring member 64 is compressed and deformed, and the sliding plate 62 moves downward against the urging force of the spring member 64. Then, as the downward load exceeding the allowable load becomes smaller, the restoring force of the spring member 64 (the force that the spring member 64 tries to return to the original shape) acts on the sliding plate 62 that has moved downward. Return to the position of.

When such a wire rope restoration device 6 is provided, it can be restored to the initial position by the spring member 64, so that adjustment work after the earthquake is not required.

The take-up device 4 is provided on the base 11. The take-up device 4 includes a motor 40 with an electromagnetic brake equipped with the brake braking portion 2 described above, a motor support portion 41 that supports the motor 40, and a take-up drum 42 that is coaxially supported by the rotation axis of the motor 40. And have.
The wire rope 3 unwound from the take-up drum 42 has a suspended load M at the tip portion 3a of the wire rope wound around the first pulley 5A and the second pulley 5B by a hanging jig (hook) or the like (not shown). Suspended.

The motor support portion 41 is fixed on the base 11 and supports the motor 40 from below.
As described above, the motor 40 has a structure with an electromagnetic brake, and as shown in FIGS. 2A and 2B, the motor 40 can rotate around the motor shaft 43 provided at the center of rotation and the motor shaft 43. It includes a yoke 44 that is supported and has a coil 45 (brake electromagnetic magnet).

The brake braking portion 2 is provided in an order in which the armature 21, the disc 22, and the plate 23 are directed away from the yoke 44 in the direction of the motor shaft 43 (hereinafter, referred to as the axis O). Further, as the brake braking portion 2, the yoke 44 is provided with a pressing spring 24 and a spring force adjusting screw 25 (spring force adjusting member) (see FIG. 2C).

The brake braking force 2 is set so that the brake braking force is equal to or greater than the motor driving force of the motor 40 (here, 1.5 times or more the motor driving force) and equal to or less than the wire rope allowable load of the wire rope 3. There is.
That is, the brake braking force in the brake braking unit 2 is set to be smaller than the wire rope load permitted in operation, and the braking force (1.5 times or more of the motor driving force) stipulated by law is set to be observed. doing.

The armature 21 approaches and separates from the disk 22 in the direction of the axis O by turning the current on and off with the coil 45. The armature 21 faces the side surface 44a orthogonal to the axis O of the yoke 44 and is arranged at a position between the yoke 44 and the disk 22.
The disc 22 is arranged between the armature 21 and the plate 23 and is movably supported along the motor shaft 43.
The plate 23 is formed in a disk shape, and the center thereof is provided at the tip portion 43a of the motor shaft 43.

In the brake braking unit 2 configured in this way, as shown in FIG. 2B, when the brake power of the motor 40 is off in normal times, a magnetic circuit is formed between the armature 21 and the yoke 44. It will not be sucked into the yoke 44 without being sucked. Therefore, due to the elastic deformation of the pressing spring 24 in the extending direction, the armature 21 separates from the yoke 44 and moves in the direction close to the disc 22. As a result, the armature 21 comes into contact with the disc 22 and further pushes the disc 22 toward the plate 23 side. As a result, the disc 22 is sandwiched between the armature 21 and the plate 23, a frictional force is generated between them, a brake braking force (brake torque) is generated, and a predetermined braking force acts.

When the brake power of the motor 40 is turned on, as shown in FIG. 2A, a magnetic circuit is formed between the armature 21 and the yoke 44, and the armature 21 is attracted to the yoke 44. At this time, the armature 21 moves in a direction close to the yoke 44 against the urging force of the pressing spring 24 by the attractive force toward the yoke 44 side. As a result, the disc 22 is separated from the armature 21 and is in an open state or a weak contact state, so that no brake braking force is generated or the brake braking force is reduced.

For example, when the allowable load of the wire rope is 8 tons and the driving force of the motor 40 is 5 tons, the brake braking force is set to 7.5 tons. In this case, the brake of the brake braking unit 2 slips at 7.5 tons due to the drop impact after the suspended load is lifted during an earthquake, and the load acting on the wire rope 3 is also 7.5 tons. That is, since the wire rope 3 is unwound when a load of 7.5 tons or more is applied, the wire rope 3 is not subjected to a tension exceeding an allowable value.

Next, a method of adjusting the brake braking force by the brake braking unit 2 having the above-described configuration will be described.
As a method of adjusting the brake braking force, as shown in FIGS. 2A and 2B, first, the suction force of the coil 45 that sucks the armature 21 in the direction away from the disc 22 is applied by half to apply the brake braking force. The wire rope 3 is slid by the brake braking portion 2 in a half-effective state. For example, in the case of a brake having a braking force of 7.5 tons, the braking force is half that of 3.75 tons. It is assumed that the initial value of this braking force is known. When the suction force of the coil 45 is applied by a normal force, the armature 21 is sucked toward the yoke 44 side, a gap is formed between the armature 21 and the disc 22, and the brake is released, but the suction force is halved. Therefore, the brake acts weakly. That is, the motor 40 can intentionally slide the brake while the braking force is half effective. For example, since the braking force of the brake is 3.75t, the brake can be slid by the motor 40 having a capacity of 5t. In this case, the braking force (1.5 times or more of the motor driving force) stipulated by law is temporarily not observed, but it is safer because the load is not actually suspended. Adjustment work can be performed.

Next, when the wire rope 3 no longer slips in the brake braking portion, the suction force of the armature 21 is reduced to reduce the brake braking force. For example, when the brake braking force is 8.5 tons, an excessive tension of 8.5 tons acts on the wire rope 3 when the suspended load falls during an earthquake, so that the brake braking force is set to, for example, the initial value of 7.5 tons. Make it smaller so that it returns, and adjust the brake so that it slides with a braking force of 3.75t.
The brake braking force of the brake braking unit 2 can be set with high accuracy by measuring and adjusting the brake braking force by intentionally sliding the motor 40 on a regular basis.

Next, as a method of adjusting the brake braking force by the brake braking unit 2, as another adjustment method of the method of adjusting the voltage of the coil 45 to change the suction force of the armature 21 as described above, FIG. 2C is shown. As shown in, there is a method of changing the spring pressing force by using the spring force adjusting screw 25.

That is, as shown in FIG. 2C, the spring force adjusting screw 25 is provided on the other side surface 44b on the side opposite to the one side surface on which the armature 21 of the yoke 44 is provided, and is one first end of the pressing spring 24. It is provided coaxially with the portion 24a. As shown in FIG. 2B, the spring force adjusting screw 25 is screwed into the female screw hole 44c provided on the other side surface 44b of the yoke 44, and the screw tip 25a of the pressing spring 24 provided at the initial position P1. It is in contact with the first end portion 24a.

Then, as shown in FIG. 2C, by tightening the spring force adjusting screw 25, the position of the pressing spring 24 can be pushed from the initial position P1 to the pushing position P2 toward the disc 22 side. Since the position of the pressing spring 24 can be adjusted by using the spring force adjusting screw 25 in this way, the elastic force with respect to the armature 21 is adjusted. As a result, the suction force of the armature 21 can be changed, and the braking force of the brake can be adjusted.

Next, the operation of the crane device 1 described above will be specifically described with reference to the drawings.
In the crane device 1 according to the present embodiment, as shown in FIG. 1, the tension exceeding the allowable load on the wire rope 3 occurs when a drop impact occurs after the suspended load suspended by the wire rope 3 is once lifted at the time of an earthquake. When (for example, 1.5 times the allowable load of the wire rope 3) acts, the wire rope 3 can be displaced in the falling direction together with the suspended load. That is, the brake braking force acting on the brake braking unit 2 can be reduced, and the wire rope 3 can be slid to pay out the wire rope 3.

At this time, since the brake braking force of the brake braking unit 2 is set to be equal to or greater than the motor driving force and equal to or less than the allowable load of the wire rope, tension exceeding the allowable value does not act on the wire rope 3 delivered in the falling direction. , The cutting and damage of the wire rope 3 can be suppressed, and the increase in the cost of the wire rope 3 can be suppressed.
Further, in the present embodiment, by setting the wire rope permissible load or less in the brake braking unit 2, when the wire rope 3 is unwound in the falling direction, the wire rope 3 is wound up by the amount unwound after the earthquake to cause an earthquake. It can be restored to the previous state.

Further, in the crane device 1 according to the present embodiment, as shown in FIG. 2A, the armature 21 is attracted to the yoke 44 of the motor 40 against the compressive force of the pressing spring 24 when the brake power is on. When it is present, a gap is formed between the disc 22 and the brake is released, or the frictional force is reduced, so that the braking force of the brake is reduced.
Further, as shown in FIG. 2B, when the brake power supply is turned off (off), the armature 21 is pushed back in the direction opposite to the suction direction by the spring force of the pressing spring 24, and the armature 21 is disced. By pressing 22, the disc 22 is sandwiched between the armature 21 and the plate 23, and the friction torque thereof can apply a brake braking force to the wire rope 3.

At this time, as shown in FIG. 2C, since the spring force of the pressing spring 24 can be adjusted by the spring force adjusting screw 25, the armature 21 and the disc 22 are in the initial state when the armature 21 is sucked. The interval can be adjusted. For example, it is possible to adjust so that a braking force of about half is applied between the armature 21 and the disc 22 in the initial state.

Further, as described above, in the brake braking force adjusting method according to the present embodiment, the brake braking force is also halved by setting the suction force of the brake electromagnetic magnet to the armature 21 to be halved, and the motor 40 intentionally wire the wire. The brake of the rope 3 can be in a slid state. Since the electromagnetic attraction force at this time is proportional to the value of the current flowing through the electromagnet, it can be easily controlled by halving the current.

Then, when the wire rope 3 does not slip in the brake braking portion 2, the brake braking force is too large. Therefore, the brake is adjusted so that the wire rope 3 slips by reducing the brake braking force. Brake As a specific adjustment method for reducing the braking force, the elastic force for pressing the armature 21 against the disc 22 is changed. That is, by attaching the spring force adjusting screw 25 in the elastic deformation direction as described above, the braking braking force can be easily adjusted, the wire rope 3 can be suppressed from being cut or damaged, and the wire rope 3 can be suppressed. It is possible to suppress the increase in cost.

In the crane device and the brake braking force adjusting method according to the above-described embodiment, the wire rope 3 is configured so that a tension exceeding the allowable load does not act on the wire rope 3 to suppress cutting or damage of the wire rope 3 and to the wire rope 3. It is possible to suppress such an increase in cost.

Although the embodiment of the crane device and the brake braking force adjusting method according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately changed without departing from the spirit.

For example, in the present embodiment, the brake braking unit 2 is set to be 1.5 times or more the motor driving force of the motor 40, but is not limited to 1.5 times or more the motor driving force, and the motor. It may be more than the driving force.

Further, in the present embodiment, the armature 21, the disc 22, and the pressing spring 24 are provided as the brake braking portion 2, and the disc 22 is pressed by the armature 21 by the pressing spring 24 to generate a brake braking force on the wire rope 3. Further, the pressing spring 24 is provided with a spring force adjusting screw 25 for adjusting the spring force, but the configuration is not limited to such a configuration. For example, the pressing structure of the pressing spring 24 may be such that the spring force adjusting screw 25 is not provided.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention, and the above-described embodiments may be combined as appropriate.

1 Crane device 2 Brake braking part 3 Wire rope 4 Winding device 5A 1st pulley 5B 2nd pulley 6 Wire rope restoration device 11 Base 21 Armature 22 Disc 23 Plate 24 Pressing spring 25 Spring force adjusting screw (spring force adjusting member)
40 Motor 43 Motor shaft 44 Yoke 45 Coil (brake electromagnetic magnet)
E1 Wire rope feeding direction E2 Wire rope winding direction Y Vertical direction M Suspended load (heavy object)

Claims (3)

A crane device equipped with a motor with an electromagnetic brake that winds up a wire rope with a heavy object suspended at one end.
The motor includes a brake braking portion that applies a brake braking force to the wire rope according to the magnitude of the load transmitted from the wire rope.
A crane device in which the brake braking force of the brake braking unit is equal to or greater than the motor driving force and equal to or less than the allowable wire rope load. The brake braking portion includes an armature supported by the motor shaft of the motor, a disc that contacts the armature to generate the brake braking force, and a pressing spring that elastically presses the armature toward the disc side. , With
The brake braking portion has a configuration in which the disc is pressed by the armature by the pressing spring to generate a brake braking force on the wire rope.
The crane device according to claim 1, wherein the pressing spring is provided with a spring force adjusting member for adjusting the spring force of the pressing spring. A brake braking unit provided with an armature supported by the motor shaft of a motor equipped with an electromagnetic brake that winds up a wire rope with a heavy object suspended at one end, and a disc that contacts the armature to generate a braking braking force. It is a method of adjusting the braking force using the crane device that it has.
A step of sliding the wire rope on the brake braking portion while half the suction force of the brake electromagnetic magnet that attracts the armature in the direction away from the disc is applied and the brake braking force is half effective.
A step of reducing the suction force of the armature to reduce the brake braking force when the wire rope is no longer slipped in the brake braking portion.
Brake braking force adjustment method.

Images