JP7362542B2 - Electric hoisting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric hoisting device for hoisting heavy objects, and more particularly to an electric hoisting device equipped with an electromagnetic brake mechanism.

In a crane system equipped with an electric hoisting device called an electric hoist for hoisting heavy objects as a suspended load and moving it up and down, the electric hoisting device has a crane hook for hoisting the suspended load. , this crane hook is attached to a wire rope that is wrapped around a rope drum. By rotating the rope drum with the hoisting motor, the crane hook is moved up and down to hoist and hoist the suspended load.

The electric hoisting device includes a hoisting motor for rotationally driving the rope drum, and a deceleration mechanism for decelerating the rotation of the hoisting motor and transmitting it to the drum. Rotationally driven through. Further, an electromagnetic brake mechanism is attached to the rotating shaft of the hoisting motor, and by operating the electromagnetic brake mechanism, the suspended load can be maintained in a suspended state. In an electric hoist, a suspended load is transported and moved in a horizontal direction in a suspended state.

The electromagnetic brake mechanism includes a brake wheel fixed to a rotating shaft of a hoisting motor, and a brake disc that makes frictional contact with a brake lining fixed to the brake wheel. The brake disc is attached to a guide pin attached to the electromagnetic brake mechanism, and is movable between a braking position in which the brake disc is in close contact with the brake wheel via the brake lining and an open position in which the contact is released.

By the way, in order to diagnose the amount of wear on the gears incorporated in the speed reduction mechanism of the electric hoisting device, for example, as described in Japanese Patent Application Laid-open No. 2008-213966 (Patent Document 1), it is necessary to start the rotation of the hoisting motor. The amount of wear is diagnosed from the rotation angle value of the rotating shaft, which is measured from the time when the current flowing through the hoisting motor rises due to the meshing of the gears.

In addition, in electric hoisting equipment, if the amount of wear on the brake lining of the electromagnetic brake mechanism becomes large, the brake disc and brake wheel will slip when stopping the hoisted load, so the electromagnetic brake mechanism must be replaced periodically. are being inspected. This periodic inspection is performed by visually inspecting the gap in the stepped portion of the guide pin for movably supporting the brake disc.

Japanese Patent Application Publication No. 2008-213966

Conventionally, as described above, the amount of wear on the brake lining has been confirmed by visually inspecting the gap between the stepped portion of the brake disc and the guide pin. For this reason, if the amount of wear is overlooked or an inspection error occurs, the amount of wear on the brake lining will exceed the specified amount, causing slippage between the brake disc and brake wheel when the electromagnetic brake mechanism is operated, and the suspended load. There is a problem with the downward movement of the

Additionally, although this is secondary, it is very troublesome to measure the gap between the brake disc and the guide pin due to the positional relationship with the stand of the electromagnetic brake mechanism and the bracket to which the electromagnetic brake mechanism is attached. There is also the issue of spending a lot of time on inspection work.

In addition, the amount of wear on the brake lining varies depending on the frequency of use of the electric hoisting device, etc., so the method of visually inspecting the gap can determine when it is time to replace the electromagnetic brake mechanism by comparing the amount of wear in the past. The problem is that it cannot be predicted accurately.

Furthermore, as described in Patent Document 1, if the amount of wear is determined from the rotation angle value of the brake wheel, it is necessary to attach a rotation angle detection device to the hoisting motor, which makes it difficult to manufacture the electric hoisting device. There is also the issue of increasing costs.

An object of the present invention is to provide an electric hoisting device that solves one or more of the above-mentioned problems and also allows easy determination of wear of the brake lining.

The first feature of the present invention is that a wear detection member is embedded and installed at a predetermined depth position inside the brake lining, when viewed from the surface of the brake lining that contacts the brake disc. .

A second feature of the present invention is that a wear detection groove is formed inside the brake lining to a predetermined depth when viewed from the surface of the brake lining that contacts the brake disc.

According to the present invention, when the brake lining wears down to a predetermined depth due to contact with the brake disc, wear of the brake lining can be recognized by the wear detection member or the wear detection groove, so wear of the brake lining can be easily determined. be able to.

1 is an external perspective view showing the overall configuration of a crane system to which the present invention is applied. 2 is a block diagram showing a control drive device for an electric motor used in the crane system shown in FIG. 1. FIG. FIG. 1 is a cross-sectional view of an electric hoisting device according to an embodiment of the present invention taken along a rotation axis. 4 is a right side view of the electric hoisting device shown in FIG. 3. FIG. 1 is an enlarged sectional view of an electromagnetic brake mechanism according to an embodiment of the present invention. 6 is a front view of the brake wheel and brake lining shown in FIG. 5. FIG. 7 is a cross-sectional view taken along the line AA in FIG. 6. FIG. 6 is a front view of another brake wheel and brake lining shown in FIG. 5. FIG.

Hereinafter, embodiments of the present invention will be described in detail using drawings, but the present invention is not limited to the following embodiments, and various modifications and applications can be made within the technical concept of the present invention. is also included within the scope.

First, with reference to FIGS. 1 and 2, the configuration of a crane system equipped with an electric hoist, commonly called an electric hoist, will be described. FIG. 1 shows the mechanical configuration of the crane system, and FIG. 2 shows the control block of its control drive.

As shown in FIG. 1, the crane girder 10 is placed so as to straddle traveling rails 11 placed in parallel at predetermined intervals. Running parts 12 provided at both ends of the crane girder 10 are mounted and supported on a running rail 11 so as to be able to run in the front and rear directions. The crane girder 10 is carried forward and backward by the rotation of the wheels 13 provided on the running section 12, and the wheels 13 are driven by the running electric motor 14 so as to move back and forth on the running rail 11.

The crane girder 10 also supports a traverse frame 15 that traverses left and right on the crane girder 10. This transverse frame 15 is equipped with a hoisting motor 16. By rotation of wheels (driving wheels 17, driven wheels 18) provided on the traversing frame 15, the traversing frame 15 moves left and right on the crane girder 10. The drive wheels 17 are driven by a traversing electric motor 19. In this embodiment, a unit in which a hoisting motor 16, a hoisting mechanism 20 (described later), and a traversing motor 19 are integrated in a traversing frame 15 will be described as an "electric hoisting device" 15. However, the traverse electric motor 19 may not always be necessary.

Further, a hoisting mechanism 20 is attached to the hoisting motor 16, and a crane hook 22 is wound around the hoisting mechanism 20 via a wire rope 21, and a load is suspended from the crane hook 22. , the traversing electric motor 19, and the traveling electric motor 14 can move the suspended load to a predetermined location.

Further, the crane system is controlled by a control drive device as shown in FIG. As shown in FIG. 2, the hoisting/traversing control device 23 includes a hoisting/traversing inverter control section 24, a hoisting inverter 25, and a traversing inverter 26. The travel control device 27 includes a travel inverter control section 28 and a travel inverter 29 built therein. The hoisting inverter 25, the traversing inverter 26, and the traveling inverter 29 are each connected to a three-phase power source 30. The hoisting/traversing inverter control section 24 and the traveling inverter control section 28 are connected to an input device 31.

Further, the hoisting motor 16 is provided with an encoder 32, and rotation information of the hoisting motor 16 is inputted to the hoisting/traversing inverter control section 24. Further, an electromagnetic brake mechanism 33 is provided on the traveling electric motor 14, the hoisting electric motor 16, and the traveling electric motor 19, and this electromagnetic brake mechanism 33 applies braking to the rotation of the rotating shafts of the respective electric motors 14, 16, and 19. It has functions.

Returning to FIG. 1, the electric hoisting device 15 uses a hoisting mechanism 20 driven by a hoisting motor 16 to hoist and lower a wire rope 21 to lift a suspended load attached to a crane hook 22 in the direction of gravity, that is, up and down. move in the direction. Further, in the left-right direction, wheels 17 and 18 driven by a traversing electric motor 19 are rotated to move along the crane girder 10 that straddles the traveling rail 11. Further, in the front-rear direction, a traveling electric motor 14 rotates wheels 13 on the traveling section 12 to move along the traveling rail 11.

The hoisting motor 16 and the traversing motor 19 are controlled by a hoisting/traversing inverter control section 24 shown in FIG. That is, when the operator inputs a predetermined instruction from the input device 31, the hoisting/traversing inverter control section 24 controls the hoisting inverter 25 and the traversing inverter 26.

Then, the frequency, voltage, and current required for control are applied from the hoisting inverter 25 and the traversing inverter 26 to the hoisting motor 16 and the traversing motor 19, and at the same time, the electromagnetic brake mechanism 33 is controlled to open. Thereby, the suspended load engaged with the crane hook 22 can move in the vertical direction without falling. Further, by controlling the electromagnetic brake mechanism 33 of the traversing electric motor 19 to open, the hoisting electric motor 3 and the hoisting mechanism 20 can be moved in the left-right direction along the crane girder 10. Here, the hoisting/traversing inverter control unit 24 determines the position of the crane hook 22 by taking in information from the encoder 32 that detects the rotation speed of the hoisting motor 16, and uses the information for operation control.

Similarly, when the operator inputs a predetermined instruction from the input device 31 in the traveling electric motor 14 attached to the traveling section 12, the traveling inverter control section 28 shown in FIG. 2 controls the traveling inverter 29. Then, by applying the frequency, voltage, and current necessary for control from the traveling inverter 29 to the traveling electric motor 14, and simultaneously controlling the electromagnetic brake mechanism 33 to open, the hoisting motor 16 and the hoisting mechanism 20 are moved along the traveling rail 11. can be moved forward and backward.

Next, the configuration of the electric hoisting device 15 will be explained. FIG. 3 shows a cross-sectional shape of the electric hoisting device 15 consisting of the hoisting motor 16, the traversing motor 19, and the hoisting device 20, and FIG. 4 shows a side view of the electric hoisting device 15 as seen from the right side.

The electric hoisting device 15 includes, on one side of the frame 34, a hoisting motor 16 that serves as a drive source for hoisting and lowering a suspended load, and an electromagnetic brake mechanism 33 that brakes the hoisting motor 16. . On the other hand, a speed reduction mechanism 35 is provided on the opposite side of the frame 34 from the hoisting motor 16. Furthermore, a connecting member 37 for transmitting the rotation of the hoisting motor 3 to the deceleration mechanism 35 is provided inside the rope drum 36 for winding the wire rope 21 for hanging a suspended load.

The rotation of the hoisting motor 16 is transmitted to the deceleration mechanism 35 via the connection member 37, further decelerated by the deceleration mechanism 35, and transmitted to the rope drum 36, and finally the rope drum 36 rotates. Thereby, the wire rope 21 wound around the rope drum 36 moves up and down, and the suspended load can be raised and lowered.

As is well known, the rope drum 36 is a cylindrical part around which the wire rope 21 is wound, and is supported by the frame 34 with a drum shaft (not shown) and bearings (not shown) at both ends. It has become. A concave rope groove around which the wire rope 21 can be wound is formed on the outer peripheral surface of the rope drum 36.

As shown in FIG. 4, a crane hook 22 for hooking a suspended load is connected to the wire rope 21 wound around the rope drum 36 via a sheave 38. Further, the frame 34 is movably supported by the crane girder 10.

As shown in FIG. 3, the traversing electric mechanism 39 includes a traversing motor 19 (see FIG. 1) that serves as a drive source for traversing the hoisting motor 16, and a traversing deceleration section that decelerates the rotation of the traversing motor 19. 40, and a traverse brake device 41 for braking the traverse electric motor 19. The rotational force of the traversing electric motor 19 is transmitted to the driving wheels 17 via the traversing reduction unit 40, and as the driving wheels 17 and driven wheels 18 rotate, the crane girder 10 is moved, and the hoisting electric motor 16 can be caused to traverse. can.

Next, the configuration of the electromagnetic brake mechanism 33 will be explained based on FIG. 5. FIG. 5 shows an enlarged cross-section of an electromagnetic brake mechanism 33 disposed adjacent to the hoisting motor 16 to which the present invention is applied.

The electromagnetic brake mechanism 33 includes a brake wheel 43 fixed to the end of a rotating shaft 42 protruding from the hoisting motor 16 and rotated together, a brake lining 44 fixed to the brake wheel 43, and a brake lining 44 that is pressed against the brake lining 44. The brake disc 45 is provided with a brake disc 45 that is brought into frictional contact with the brake disc 45, and an electromagnetic actuator 46 that controls contact between the brake lining 44 and the brake disc 45. The brake wheel 43 and the brake disc 45 may be used as a single set or as a plurality of sets as required.

The electromagnetic actuator 46 and the brake disc 45 are connected by a link mechanism 47, and the brake disc 45 is freely supported in the axial direction by a guide pin 47G. As a result, when the electromagnetic actuator 46 is operated, the brake disc 45 is moved along the guide pin 47G by the link mechanism 47, and the brake lining 44 and the brake disc 45 are brought into close contact with each other. Here, the electromagnetic actuator 46 can be a solenoid, an electric motor, or the like.

When the winding/lowering operation is stopped, the electromagnetic brake mechanism 33 uses an electromagnetic actuator 46 to bring the brake disc 45 into contact with the brake lining 44 of the brake wheel 43, and uses the frictional force to brake and fix the rotating shaft 42. are doing. In a state where the winding/lowering operation is performed, the electromagnetic actuator 46 brings the brake lining 44 and the brake disc 45 into an open state (non-contact), so that the rotating shaft 42 can be rotated.

The electromagnetic brake mechanism 33 is covered by a brake cover 49. The brake cover 49 is removably attached to the end of the electromagnetic brake mechanism 33, and forms a sealed space isolated from the outside of the cover, so that the electromagnetic brake mechanism 33 is housed in the space. It has become.

The brake cover 49 is attached to the end of the hoisting motor 16 to form a first housing chamber 50 in which the electromagnetic actuator 46 of the electromagnetic brake mechanism 33 is housed, and a second housing chamber 50 in which the brake wheel 43 and the brake disc 45 are housed. A storage chamber 51 is formed. The second storage chamber 51 is formed adjacent to the first storage chamber 50, and the brake wheel 43 and the brake disc 45 are stored in the second storage chamber 51.

A shielding plate (not shown) is installed inside the brake cover 49 to partition the first storage chamber 50 and the second storage chamber 51. This makes it possible to prevent the dust from entering the first storage chamber 50 and adhering to the electromagnetic actuator 46 and the like.

Next, the configuration of the brake wheel 43, which is a feature of this embodiment, will be explained based on FIGS. 6 and 7.

The brake wheel 43 has a circular shape, and a brake lining 44 is fixed to a side surface thereof and a radially outer region thereof. A plurality of holes 48 are formed near the middle of the brake wheel 43 in the radial direction so as to open at predetermined intervals in the circumferential direction.

The brake wheel 43 is composed of a circular brake wheel body 52 made of metal with a predetermined thickness, and an annular brake lining 44 fixed to both sides or one side of the brake wheel body 52. . In this embodiment, the brake lining 44 is fixed to both sides of the brake wheel body 52. The brake lining 44 is made of, for example, a binding material such as resin, a reinforcing material such as organic/inorganic fiber, a lubricant, a filler, an abrasive material, a friction adjustment material such as metal powder, etc., and is made by molding the binding material. It is made.

A fixing hole 53 to which the rotating shaft of the hoisting motor 16 is fixed is formed in the center of the brake wheel body 52, and the rotating shaft 42 is press-fitted into this fixing hole 53. Note that the rotating shaft 42 and the fixing hole 53 may be connected by welding or by serrations. Six holes 48 are formed in the brake wheel body 52 between the brake lining 44 and the fixing hole 53 and arranged at equal intervals (equal angles). This hole 48 is formed to reduce the weight of the brake wheel body 52.

As shown in FIGS. 6 and 7, a wear detection member 54 is embedded inside the brake lining 44 at a predetermined depth position when viewed from the surface of the brake lining 44 that contacts the brake disc 45. It has been installed. As can be seen from FIG. 6, the wear detection members 54 are formed in the shape of an elongated rectangular parallelepiped, and are provided along the radial direction of the brake lining 44 at intervals of 60°.

This wear detection member 54 is formed on the surface of the brake lining 44 facing the brake wheel main body 52 (brake wheel side surface) and is stored in a storage groove (storage portion) along the radial direction. The housed wear detection member 54 is integrated with the brake lining 44 using an adhesive and is installed in an embedded state. Note that, depending on the case, when molding the brake lining 44, it is also possible to simultaneously embed the wear detection member 54 integrally therein.

The thickness of the wear detection member 54 attached to the storage groove of the brake lining 44 is such that the surface of the wear detection member 54 has a predetermined thickness when viewed from the surface where the brake lining 44 contacts the brake disc 45 (brake disc side surface). It is determined that it exists at the length position. That is, the wear detection member 55 is embedded at a predetermined depth position when viewed from the surface of the brake lining 44 that contacts the brake disc 45 (brake disc side surface).

For example, this predetermined depth position (the length from the surface in contact with the brake disc 45 to the wear detection member 54) is the allowable wear limit value (L) of the brake lining 44. When the brake lining 44 wears out due to contact with the brake disc 45 and reaches a wear limit value (L), the surface of the wear detection member 54 is scraped by the brake disc 45.

Here, the wear detection member 54 is made of the same material as the brake lining 44, and a colored pigment is mixed therein. The colored pigment is a pigment of a different color from the brake lining 44 so that it can be clearly distinguished from the brake lining 44.

For example, by using a chromatic color or a colored pigment that is complementary to the color of the brake lining 44, it can be clearly distinguished from the brake lining 44. Although the wear detection member 54 has been described as being made of the same material as the brake lining 44, it is not limited thereto, and may be made of a synthetic resin material mixed with a colored pigment.

Then, the electromagnetic brake mechanism 33 operates and the brake lining 44 is scraped by the brake disc 45, but when the brake lining 44 is further scraped down to the wear limit value (L), the wear detection member 54 is exposed. In this state, by removing the brake cover 49 shown in FIG. 5 and observing the brake lining 44, if the colored wear detection member 54 can be confirmed, it can be determined that it is time to replace the brake lining 44.

Further, since the wear detection member 54 is scraped by the brake disc 45, abrasion powder is generated, and this abrasion powder accumulates in the brake cover 49. If this wear powder can be confirmed, it can be determined that it is time to replace the brake lining 44. When checking the wear powder, the brake cover 49 can be removed and checked as described above, but in addition to this, as shown in FIG. By providing the confirmation hole 55 in the housing 56 of the hoisting motor 16, wear powder can be confirmed without removing the brake cover 49.

In this way, in this embodiment, it is possible to easily confirm that the brake lining 44 has reached the wear limit value (L) without measuring the gap between the brake disc and the guide pin as in the conventional case, which makes maintenance work easier. Work efficiency can be improved.

Here, in the above embodiment, the time to replace the brake lining 44 is determined based on the difference in color of the wear detection member 54 and the wear powder thereof.

On the other hand, it is also possible to determine when to replace the brake lining 44 based on the sound of the electromagnetic brake mechanism 33 during the braking operation.

As described above, if the wear detection member 54 is made of a material different from the material of the brake lining 44, for example, synthetic resin, the sound when the brake disc 45 contacts the brake lining 44 and the wear caused by the brake lining 44 are abraded. Since the sounds of contact with the detection member 54 are different, it is also possible to determine when to replace the brake lining 44 based on the difference in the sounds.

Further, in an embodiment in which the time to replace the brake lining 44 is determined based on sound, the wear detection member 54 may be made of metal. Normal operation is possible until the brake lining 44 reaches the wear limit value (L). On the other hand, when the wear limit value (L) is exceeded, the metal brake disc 45 and the metal wear detection member 54 come into contact with each other, so the sound becomes different from that when they come into contact with the brake lining 44. Moreover, the metal brake disc 45 and the wear detection member 54 can be made integrally. Therefore, it is also possible to determine when to replace the brake lining 44 from the difference in this sound.

In this way, in this embodiment as well, it is possible to easily confirm that the brake lining 44 has reached the wear limit value (L) without measuring the gap between the brake disc and the guide pin as in the conventional case. can improve workability.

In the embodiment described above, the wear detection member 54 has a rectangular parallelepiped shape disposed along the radial direction of the brake lining 44, but is not limited to this, and may have any shape such as a columnar shape or an elliptical columnar shape. It can be done. The point is that it is sufficient to recognize that the brake lining 44 has exceeded the wear limit value (L).

Further, although only six wear detection members 54 are provided at equal intervals in the circumferential direction of the brake lining 44, the present invention is not limited to this, and at least one or more wear detection members 54 may be provided. It is something.

Next, the configuration of a brake wheel 43 according to another embodiment will be described based on FIG. 8. In the embodiment described above, the wear detection member 54 is embedded in the brake lining 44, but in other embodiments described next, a wear detection groove 57 is formed in place of the wear detection member 54. be.

In FIG. 8, inside the brake lining 44, a wear detection groove 57 reaching a predetermined depth is formed on the surface of the brake lining 44 that contacts the brake disc 45 (brake disc side surface). As can be seen from FIG. 8, the wear detection grooves 57 are formed in an elongated groove shape with a rectangular cross section, and are provided along the radial direction of the brake lining 44 at intervals of 60 degrees.

The depth of the wear detection groove 57 formed in the brake lining 44 extends to a predetermined depth position when viewed from the surface where the brake lining 44 contacts the brake disc 45 (brake disc side surface).

For example, this predetermined depth position is the allowable wear limit value (L) of the brake lining 44, as shown in FIG. Then, when the brake lining 44 wears out due to contact with the brake disc 45 and reaches a wear limit value (L), the wear detection groove 57 disappears.

Then, the electromagnetic brake mechanism 33 operates and the brake lining 44 is scraped by the brake disc 45, but when the brake lining 44 is further scraped to a wear limit value (L), the wear detection groove 57 disappears. In this state, by removing the brake cover 49 shown in FIG. 5 and observing the brake lining 44, if the wear detection groove 57 can be confirmed, there is no need to replace the brake lining 44, and if the wear detection groove 57 cannot be confirmed, , it can be determined that it is time to replace the brake lining 44.

Furthermore, a flat plate having a predetermined thickness made of colored synthetic resin or the like may be buried in the bottom of the wear detection groove 57. This flat plate can be integrally formed by molding at a position corresponding to the bottom of the wear detection groove 57 when forming the brake lining 44 .

Therefore, after the brake lining 44 has been ground down to the wear limit value (L), the flat plate is ground by the brake disc 45, producing colored abrasion powder, which accumulates in the brake cover 49. As described in the previous embodiment, if this wear powder can be confirmed, it can be determined that it is time to replace the brake lining 44.

When checking the wear powder, the brake cover 49 can be removed and checked as described above, but in addition to this, as shown in FIG. By providing the confirmation hole 55 in the housing 56 of the hoisting motor 16, wear powder can be confirmed without removing the brake cover 49.

In this way, in this embodiment as well, it is possible to easily confirm that the brake lining 44 has reached the wear limit value (L) without measuring the gap between the brake disc and the guide pin as in the conventional case. Work efficiency can be improved.

In the embodiment described above, the wear detection groove 57 is disposed along the radial direction of the brake lining 44 and has a rectangular cross section, but is not limited to this, and may have a groove shape such as an arcuate cross section. It can be made into any shape. In short, it is sufficient that the brake lining 44 has a shape that disappears when the wear limit value (L) is exceeded.

Further, although only six wear detection grooves 57 are provided at equal intervals in the circumferential direction of the brake lining 44, the present invention is not limited to this, and at least one or more wear detection grooves 57 may be provided. It is something.

Note that the present invention is not limited to the embodiments described above, and includes various modifications. For example, the above-described embodiments have been described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described. Furthermore, it is possible to replace a 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 some of the configurations of each embodiment with other configurations.

DESCRIPTION OF SYMBOLS 10... Crane girder, 11... Running rail, 12... Running part, 13... Wheel, 14... Traveling motor, 15... Traversing frame, 16... Hoisting motor, 17... Drive wheel, 18... Driven wheel, 19... Traversing electric motor, 33... Electromagnetic brake mechanism, 34... Frame, 35... Reduction mechanism, 36... Rope drum, 43... Brake wheel, 44... Brake lining, 45... Brake disc, 46... Electromagnetic actuator, 47... Link mechanism, 52... Brake wheel body , 54... Wear detection member, 57... Wear detection groove.

Claims (6)

The electric hoisting device is provided with a hoisting motor that drives a hoisting mechanism that hoists and lowers a suspended load, and an electromagnetic brake mechanism that switches a rotating shaft of the hoisting motor between a stopped state and an open state. hand,
The electromagnetic brake mechanism at least includes:
a brake wheel including a brake wheel body connected to the rotating shaft; and a brake lining fixed to the brake wheel body;
a brake disc that operates in a state in which it is in contact with the brake lining and in a state in which it is released from contact with the brake lining,
The brake lining is provided with a storage portion in which a wear detection member is stored at a predetermined depth position when viewed from a surface of the brake lining that contacts the brake disc. Ori,
The wear detection member made separately from the brake lining is stored and fixed in the storage portion.
An electric hoisting device characterized by: The electric hoisting device according to claim 1,
The electric hoisting device is characterized in that the wear detection member is colored and is scraped by the brake disc. The electric hoisting device according to claim 2,
The wear detection member is made of a material of the brake lining mixed with a colored pigment, and the wear detection member is fixed to the housing part of the brake lining with an adhesive.
An electric hoisting device characterized by: The electric hoisting device according to claim 2,
The wear detection member is made of a material different from that of the brake lining.
An electric hoisting device characterized by: The electric hoisting device according to claim 1,
The wear detection member is made of metal.
An electric hoisting device characterized by: In the electric hoisting device according to any one of claims 1 to 5,
The predetermined depth position is an allowable wear limit value of the brake lining.
An electric hoisting device characterized by:

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