CN111609064B

CN111609064B - Brake evaluation device and brake evaluation method

Info

Publication number: CN111609064B
Application number: CN201911117738.5A
Authority: CN
Inventors: 大串泰斗
Original assignee: Mitsubishi Heavy Industries Machinery Systems Co Ltd
Current assignee: Mitsubishi Heavy Industries Machinery Systems Co Ltd
Priority date: 2019-02-22
Filing date: 2019-11-15
Publication date: 2022-07-15
Anticipated expiration: 2039-11-15
Also published as: CN111609064A; JP7236288B2; JP2020132398A

Abstract

The invention provides a brake evaluation device and a brake evaluation method, which properly determine the implementation time of maintenance operation of a disc brake. The brake evaluation device includes an operating state data acquisition unit that acquires operating state data indicating an operating state of an electric motor that drives a rotating body, an intrinsic data acquisition unit that acquires intrinsic data of a brake member of a disc brake that brakes the rotating body, and a state estimation unit that estimates a state of the brake member based on the operating state data and the intrinsic data.

Description

Brake evaluation device and brake evaluation method

Technical Field

The present invention relates to a brake evaluation device and a brake evaluation method.

Background

Deck cranes are used in cargo handling operations on ships. The deck crane includes a rotating body that rotates about a rotating shaft, a boom that rotates about a pitch axis, and a hoist rope. The deck crane further includes a disc brake for braking the rotating body, the boom, and the hoist rope, respectively. Patent document 1 discloses an example of a disc brake including a brake lining and a brake pad.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2012 and 116623

Disclosure of Invention

Technical problem to be solved by the invention

Brake pads are consumables. Therefore, maintenance work such as a clearance adjustment work of the brake lining and the brake pad or a replacement work of the brake lining is performed. Methods for determining the timing of performing the maintenance work include a method of measuring the clearance between the brake lining and the brake pad with a sensor, a method of visually inspecting the brake lining by a maintenance worker, and a method of using the operation time or the number of operations of the disc brake as an index.

The method of measuring the clearance between the brake lining and the brake pad by means of the sensor may result in increased costs for maintenance work. In addition, although the wear amount of the brake pad can be measured, it is difficult to determine whether the brake pad has been thermally broken. A maintenance worker requires regular inspection by a method of visually inspecting the brake friction lining, and there is a possibility that variations may occur in the determination result by the maintenance worker. The method using the operation time or the number of operations of the disc brake as an index may make it difficult to appropriately determine the timing of performing the maintenance work. That is, the deterioration state of the brake pads fluctuates depending on the use condition of the disc brake. For example, in the case of a brake pad for an emergency brake, when a disc brake is used under severe use conditions, although it is necessary to perform maintenance work as early as possible, if the operation time or the number of operations of the disc brake is taken as an index, it is difficult to appropriately determine the timing of performing the maintenance work.

Means for solving the problems

The purpose of the present invention is to appropriately determine the timing of performing maintenance work on a disc brake.

A brake evaluation device includes an operating state data acquisition unit that acquires operating state data indicating an operating state of an electric motor that drives a rotating body, a unique data acquisition unit that acquires unique data of a brake member that brakes a disc brake of the rotating body, and a state estimation unit that estimates a state of the brake member based on the operating state data and the unique data.

The invention provides a brake evaluation method, which comprises the following steps: the method includes a step of acquiring operating state data indicating an operating state of an electric motor that drives a rotating body, a step of acquiring unique data of a brake member of a disc brake that brakes the rotating body, and a step of estimating a state of the brake member based on the operating state data and the unique data.

Effects of the invention

According to the present invention, the timing of performing the maintenance work of the disc brake is appropriately determined.

Drawings

Fig. 1 is a diagram showing an example of a deck crane system according to the present embodiment.

Fig. 2 is a diagram showing an example of the deck crane according to the present embodiment.

Fig. 3 is a schematic view showing an example of the disc brake according to the present embodiment.

Fig. 4 is a functional block diagram showing an example of the deck crane according to the present embodiment.

Fig. 5 is a flowchart showing an example of the brake evaluation method according to the present embodiment.

Fig. 6 is a block diagram showing an example of the computer system according to the present embodiment.

Description of the reference numerals

10 … deck crane

11 … rotary body

12 … jib

13 … rotary device

13B … rotary brake

13M … rotary motor

14 … pitching device

14B … pitch brake

14D … reel

14M … pitch motor

15 … lifting device

15B … lifting brake

15D … reel

15M … lifting motor

16 … stand

16S … bearing surface

17 … pulley

18 … halyard

18H … holder

19 … pitch cable

20 … control device

30 … brake evaluation device

31 … operation state data acquisition unit

32 … unique data acquisition unit

33 … storage part

34 … state estimating unit

35 … evaluation data output unit

51 … brake wheel

52 … brake pad

53 … brake pad

54 … driver

55 … guide pin

61 … inverter

62 … rotation sensor

63 … informing device

100 … deck crane system

101 … ship

102 … Deck

1000 … computer system

1001 … processor

1002 … Main memory

1003 … memory

1004 … interface

AX1 … rotary shaft

AX2 … pitch axis

C … running room

R … control room

Detailed Description

The embodiments of the present invention are described with reference to the drawings, but the present invention is not limited to the embodiments. The components of the embodiments may be combined, or some of the components may be omitted.

[ Deck Crane System ]

Fig. 1 is a diagram showing an example of a deck crane system 100 according to the present embodiment. The deck crane system 100 is used for cargo handling operations of a vessel 101. The deck crane system 100 includes a deck crane 10, a control device 20, and a brake evaluation device 30.

The deck crane system 100 is a cargo handling work machine. The deck crane 10 is provided on a deck 102 of a vessel 101. A plurality of deck cranes 10 may be disposed on the deck 102, or a single deck crane 10 may be disposed on the deck 102. Fig. 1 shows an example in which a 4-deck crane 10 is provided on a deck 102.

The control device 20 includes a computer system. The control device 20 controls the deck crane 10. The control device 20 is disposed on each of the plurality of deck cranes 10.

The brake evaluation device 30 includes a computer system. The brake evaluation device 30 evaluates the state of a disc brake provided in the deck crane 10. The brake evaluation device 30 is disposed on each of the plurality of deck cranes 10. The timing of performing the maintenance work is determined based on the evaluation data output from the brake evaluation device 30.

[ Deck Crane ]

Fig. 2 is a diagram showing an example of the deck crane 10 according to the present embodiment. As shown in fig. 2, the deck crane 10 includes a rotating body 11, a boom 12, a rotating device 13, a tilting device 14, and a lifting device 15.

The gantry 16 is supported on the deck 102 of the vessel 101. The rotating body 11 is supported by a mount 16. The rotary body 11 is rotatably supported on the mount 16 about a rotation axis AX 1. The rotation axis AX1 is orthogonal to the support surface 16S of the gantry 16.

The boom 12 is coupled to the rotating body 11. The boom 12 is a rod-shaped member. The boom 12 has a base end portion coupled to the rotating body 11. The boom 12 is rotatably coupled to the rotating body 11 about a pitch axis AX 2. The pitch axis AX2 is parallel to the support surface 16S of the stand 16.

A pulley 17 is provided at the front end of the boom 12. A lifting rope 18 for lifting the goods is suspended from the pulley 17. The base end portion of the hoist cable 18 is attached to the drum 15D of the hoist device 15. A retainer 18H for retaining the load is provided at the tip end of the hoist rope 18. As the holder 18H, a grapple for grasping the load or a hook for hooking the load is exemplified.

The pitch cable 19 is attached to the boom 12. One end of the tilt cable 19 is attached to the middle portion of the boom 12, and the other end of the tilt cable 19 is attached to the drum 14D of the tilt device 14.

The rotating device 13 rotates the rotating body 11 around the rotation axis AX 1. The turning device 13 includes a turning motor 13M that drives the turning body 11 and a turning brake 13B that brakes the turning body 11. The rotary body 11 is rotated about the rotation shaft AX1 by the driving force generated by the rotation motor 13M. The rotating body 11 is stopped by the braking force generated by the rotation brake 13B.

The pitching device 14 rotates the boom 12 about a pitching axis AX 2. The tilting device 14 includes a tilting motor 14M for driving the boom 12 and a tilting brake 14B for braking the boom 12. The boom 12 is rotated about the pitch axis AX2 by the driving force generated by the pitch motor 14M. The boom 12 is stopped by the braking force generated by the tilt brake 14B.

The lifting device 15 lifts the lifting rope 18. The hoist device 15 includes a hoist motor 15M for driving the hoist rope 18 and a hoist brake 15B for braking the hoist rope 18. The hoist rope 18 is raised and lowered by the driving force generated by the hoist motor 15M. The hoist rope 18 is stopped by the braking force generated by the hoist brake 15B.

The pitch motor 14M generates a driving force for rotating the drum 14D. The lift cable 19 is wound around the drum 14D by rotation of the drum 14D, whereby the boom 12 is rotated in the pitch direction. The tilting direction is a direction in which the front end portion of the boom 12 moves upward. By the rotation of the drum 14D, the boom 12 is rotated in the downward direction by the pitch wire 19 being released from the drum 14D. The downward direction is a direction in which the tip end portion of the boom 12 moves downward.

The lifting motor 15M generates a driving force for rotating the drum 15D. By the rotation of the drum 15D, the halyard 18 is wound around the drum 15D, and the holder 18H is raised. By the rotation of the drum 15D, the hoist rope 18 is released from the drum 15D, and the holder 18H is lowered.

The rotary motor 13M is an electric motor that drives the rotary body 11. The pitch motor 14M is an electric motor that drives the drum 14D as a rotating body. The lifting motor 15M is an electric motor that drives the drum 15D as a rotating body. The deck crane 10 is an electric deck crane operated by a driving force generated by an electric motor.

The rotation brake 13B is a disc brake that brakes the rotating body 11. The pitch brake 14B is a disc brake that brakes the drum 14D. The lifting brake 15B is a disc brake that brakes the drum 15D.

The control device 20 controls the deck crane 10. The control device 20 controls the rotation motor 13M, the rotation brake 13B, the pitch motor 14M, the pitch brake 14B, the lift motor 15M, and the lift brake 15B. The gantry 16 is provided with a control room R and an operation room C. The control device 20 is disposed in the control room R. The control device 20 may be disposed in the cab C.

The brake evaluation device 30 evaluates the state of the rotation brake 13B, the state of the pitch brake 14B, and the state of the lift brake 15B. The brake evaluation device 30 is disposed in the control room R. The brake evaluation device 30 may be disposed in the cab C.

[ disc brake ]

Fig. 3 is a schematic view showing an example of the disc brake according to the present embodiment. Fig. 3 shows an example of the up-down brake 15B. The structure of the rotation brake 13B and the structure of the pitch brake 14B are the same as those of the lift brake 15B.

The lift brake 15B is a dry disc brake. As shown in fig. 3, the lift brake 15B includes a plurality of brake wheels 51, brake pads 52 facing the brake wheels 51, brake linings 53 disposed on the peripheral edge portions of the brake wheels 51, and an actuator 54 displacing the brake pads 52.

The brake wheel 51 is fixed to at least a part of the reel 15D as a rotating body. The brake wheel 51 may be fixed to an output shaft of the elevating motor 15M as a rotating body. When the reduction gear is coupled to the lifting motor 15M and the lifting brake 15B, the brake pulley 51 may be fixed to a rotating body of the reduction gear. In the present embodiment, two brake wheels 51 are provided in the axial direction parallel to the rotation axis of the rotating body. The brake wheel 51 rotates together with the rotating body. The brake wheel 51 is movable in the axial direction in a state where relative rotation with the rotating body is restricted.

The brake plate 52 is annular. The brake disc 52 is disposed between the plurality of brake wheels 51. The brake pad 52 is a fixed-side brake member. An opening is provided in a portion of the brake pad 52. The guide pin 55 is inserted into an opening of the stopper plate 52. The rotation of the brake plate 52 is restricted by the guide pin 55. The brake pad 52 is movable in the axial direction.

The brake lining 53 is disposed on the peripheral edge of the brake wheel 51. Brake pads 53 rotate with brake wheel 51. The brake lining 53 is a rotating-side brake member.

When the brake lining 53 and the brake pad 52 are in contact with each other by the operation of the actuator 54, the lift brake 15B is in a braking state. The lift brake 15B restricts rotation of the drum 15D in a braking state. When the contact between the brake lining 53 and the brake pad 52 is released, the lift brake 15B is in an open state. The lift brake 15B is in an open state, and the drum 15D is rotatable.

[ brake evaluation device ]

Fig. 4 is a functional block diagram showing an example of the deck crane 10 according to the present embodiment. In the following description, an example in which the lifting brake 15B of the lifting device 15 is evaluated by the brake evaluation device 30 will be described.

The deck crane 10 includes an elevation motor 15M that drives the drum 15D, an inverter 61 that supplies current to the elevation motor 15M, a rotation sensor 62 that detects rotation of the elevation motor 15M, a driver 54 that switches the elevation brake 15B between a braking state and an open state, a control device 20, a brake evaluation device 30, and a notification device 63.

Inverter 61 supplies a current for driving lift motor 15M to lift motor 15M. The inverter 61 is controlled by the control device 20. Control device 20 outputs a control command to inverter 61 so that current is supplied from inverter 61 to hoist motor 15M. In the present embodiment, control device 20 outputs a speed command to inverter 61 to drive lift motor 15M at the target rotational speed. Based on the speed command output from control device 20, inverter 61 supplies a current to lift motor 15M so that lift motor 15M is driven at the target rotation speed.

The hoist motor 15M is driven based on the current supplied from the inverter 61. The torque generated by the hoist motor 15M varies based on the current supplied from the inverter 61. The torque generated by the hoist motor 15M increases as the current supplied from the inverter 61 increases, and the torque generated by the hoist motor 15M decreases as the current supplied from the inverter 61 decreases. In the present embodiment, the torque generated by the hoist motor 15M is substantially proportional to the current supplied from the inverter 61.

Rotation sensor 62 detects the rotation speed of lift motor 15M per unit time. The rotation speed and the rotation acceleration of the hoist motor 15M are calculated based on the detection data of the rotation sensor 62.

The driver 54 switches between a braking state of the lift brake 15B in which the brake lining 53 and the brake pad 52 are in contact and an open state of the lift brake 15B in which the contact between the brake lining 53 and the brake pad 52 is released. The driver 54 is controlled by the control device 20. When the lift brake 15B is in the open state, the control device 20 outputs a brake command so that the lift brake 15B is in the brake state. When a braking command is output from the control device 20, the lifting brake 15B is in a braking state, and the drum 15D is stopped. The drum 15D stops and the raising and lowering of the halyard 18 stops. The elevator brake 15B is in a braking state, and the elevator motor 15M is stopped. When the lift brake 15B is in the braking state, the control device 20 outputs an open command so that the lift brake 15B is in the open state. When the control device 20 outputs an open command, the lift brake 15B is in an open state and the drum 15D is rotatable. The drum 15D is rotatable and the halyard 18 is liftable. In addition, the elevation motor 15M is rotatable by the elevation brake 15B being in the open state.

The brake evaluation device 30 includes an operation state data acquisition unit 31, a unique data acquisition unit 32, a storage unit 33, a state estimation unit 34, and an evaluation data output unit 35.

The operating state data acquiring unit 31 acquires operating state data indicating the operating state of the lifting motor 15M that drives the drum 15D. The operation state data includes the rotation speed of the hoist motor 15M, the torque of the hoist motor 15M, and the braking time from when the control device 20 outputs the braking command to when the drum 15D is actually stopped.

In the present embodiment, the operation state of the lifting motor 15M is the operation state of the lifting motor 15M when the lifting brake 15B is changed from the released state to the braked state. That is, the operating state of the elevation motor 15M is the operating state of the elevation motor 15M in which the elevation brake 15B is in the released state before the braking state.

The rotation speed of the elevation motor 15M is the rotation speed of the elevation motor 15M when the elevation brake 15B changes from the released state to the braked state. The rotation speed of the lift motor 15M is detected by the rotation sensor 62. The operating state data acquisition unit 31 can acquire the rotation speed of the hoist motor 15M based on the detection data of the rotation sensor 62.

The torque of the lift motor 15M is the torque of the lift motor 15M when the lift brake 15B changes from the released state to the braked state. The torque of lift motor 15M changes based on the current supplied from inverter 61 to lift motor 15M. The operating state data acquisition unit 31 can acquire the torque of the hoist motor 15M based on the current output from the inverter 61.

The start time of the braking time is a time when the lift brake 15B is in the released state and the control device 20 outputs a braking command. The end time of the braking time is a time when the rotation of the drum 15D and the lift motor 15M is actually stopped. The operating state data acquisition unit 31 can specify the start time of the braking time by acquiring the braking command output from the control device 20. The operating state data acquisition unit 31 can specify the end time of the braking time by acquiring the detection data of the rotation sensor 62. The operating state data acquisition unit 31 can acquire the braking time based on the start time of the braking time and the end time of the braking time.

The unique data acquiring unit 32 acquires unique data of the brake pads 53 of the lifting brake 15B of the brake drum 15D. The intrinsic data includes the surface area of the brake pads 53 in contact with the caliper 52 and the wear rate of the brake pads 53.

The surface area of the brake lining 53 includes the contact area of the brake lining 53 in contact with the brake pad 52. The surface area of the brake lining 53 is, for example, known data derived from specification data of the brake lining 53. The surface area of the brake pads 53 is stored in the storage portion 33.

The wear rate of the brake lining 53 is the amount of wear per unit of frictional work [ cm [ ]³/J]. The wear rate is a value determined based on, for example, the material constituting the brake friction lining 53. The wear rate of the brake pads 53 is known data derived, for example, from specification data of the brake pads 53. The wear rate of the brake pads 53 is stored in the storage section 33.

The unique data acquiring unit 32 acquires the unique data of the brake pads 53 from the storage unit 33. When the input device is connected to the brake evaluation device 30, the maintenance operator can input the data specific to the brake lining 53 to the brake evaluation device 30 by operating the input device. The unique data acquiring unit 32 can acquire the unique data of the brake pads 53 from the input device.

The state estimating unit 34 estimates the state of the brake pads 53 based on the operating state data acquired by the operating state data acquiring unit 31 and the unique data acquired by the unique data acquiring unit 32. The state estimating unit 34 estimates the temperature of the brake friction lining 53 and the amount of wear of the brake friction lining 53 as the state of the brake friction lining 53.

In the following description, the temperature of the brake friction lining 53 estimated by the state estimating unit 34 is appropriately referred to as an estimated temperature of the brake friction lining 53, and the wear amount of the brake friction lining 53 estimated by the state estimating unit 34 is appropriately referred to as an estimated wear amount of the brake friction lining 53. The state of the brake pad 53 estimated by the state estimating unit 34 includes the estimated temperature of the brake pad 53 and the estimated wear amount of the brake pad 53.

When estimating the temperature of the brake pads 53, the state estimating unit 34 calculates the braking energy of the brake pads 53 based on the rotation speed of the lift motor 15M, the torque of the lift motor 15M, the braking time, and the surface area of the brake pads 53. The state estimating unit 34 has a calculation formula for calculating the braking energy from the rotational speed of the lifting motor 15M, the torque of the lifting motor 15M, the braking time, and the surface area of the brake pad 53. The state estimation unit 34 calculates the braking energy using the arithmetic expression.

The state estimating unit 34 estimates the temperature of the brake pads 53 from the calculated braking energy of the brake pads 53. The state estimating unit 34 has an arithmetic expression for calculating the temperature of the brake pads 53 from the braking energy. The state estimating unit 34 calculates the estimated temperature of the brake pads 53 using the arithmetic expression.

The higher the rotation speed of the elevating motor 15M, the greater the braking energy. The braking energy increases as the torque of the lift motor 15M increases. The braking time is longer as the rotation speed of the elevation motor 15M is higher, and is longer as the torque of the elevation motor 15M is higher. In addition, the shorter the braking time, the greater the braking energy. The larger the surface area of the brake lining 53, the greater the braking energy. The state estimating unit 34 can calculate the braking energy of the brake pads 53 based on the rotation speed of the lift motor 15M, the torque of the lift motor 15M, the braking time, and the surface area of the brake pads 53. The state estimating unit 34 can calculate the estimated temperature of the brake pads 53 based on the braking energy.

When estimating the wear amount of the brake pad 53, the state estimating unit 34 estimates the wear amount of the brake pad 53 based on the rotation speed of the lift motor 15M, the torque of the lift motor 15M, the surface area of the brake pad 53, and the wear rate of the brake pad 53. The state estimating unit 34 has a calculation formula for calculating the wear amount based on the rotation speed of the lifting motor 15M, the torque of the lifting motor 15M, the surface area of the brake friction lining 53, and the wear rate of the brake friction lining 53. The state estimating unit 34 calculates the amount of wear of the brake pads 53 using the arithmetic expression.

The evaluation data output unit 35 outputs evaluation data of the brake pads 53. The evaluation data of the brake friction lining 53 includes evaluation data indicating whether or not the brake friction lining 53 is thermally broken. The evaluation data of the brake friction lining 53 includes evaluation data indicating whether or not the wear amount of the brake friction lining 53 is equal to or greater than a reference value.

The evaluation data output unit 35 outputs evaluation data of the brake friction lining 53 based on the heat-resistant temperature of the brake friction lining 53 and the estimated temperature of the brake friction lining 53 estimated by the state estimating unit 34. The heat-resistant temperature of the brake friction lining 53 is the maximum value of the temperature at which the brake friction lining 53 is not thermally damaged. If the temperature of the brake pad 53 exceeds the heat-resistant temperature, the brake pad 53 is thermally broken, and therefore, maintenance work is required. The heat-resistant temperature of the brake friction lining 53 is known data derived from, for example, specification data of the brake friction lining 53. The heat-resistant temperature of the brake friction lining 53 is stored in the storage portion 33. The evaluation data output unit 35 can output evaluation data indicating whether or not the brake friction lining 53 is thermally broken, based on the heat-resistant temperature of the brake friction lining 53 stored in the storage unit 33 and the estimated temperature of the brake friction lining 53 estimated by the state estimation unit 34.

The evaluation data output unit 35 outputs the evaluation data of the brake friction lining 53 based on the accumulated wear amount of the estimated wear amount of the brake friction lining 53 estimated by the accumulated state estimating unit 34. When the accumulated wear amount of the brake pads 53 exceeds a reference value, maintenance work of the brake pads 53 is required. The reference value of the accumulated wear amount of the brake pads 53 is a predetermined value and is stored in the storage unit 33. The evaluation data output unit 35 can output evaluation data indicating whether or not the wear amount of the brake friction lining 53 is equal to or greater than the reference value based on the reference value of the brake friction lining 53 stored in the storage unit 33 and the accumulated wear amount of the brake friction lining 53 estimated by the state estimation unit 34.

In the present embodiment, the reference value of the accumulated wear amount of the brake pads 53 includes an adjustment reference value of the clearance adjustment operation of the brake pads 53 and the brake pads 52 and a replacement reference value of the replacement operation of the brake pads 53. The replacement reference value is larger than the adjustment reference value.

The notification device 63 notifies the maintenance worker of the evaluation data of the brake pads 53 output from the evaluation data output unit 35. The notification device 63 is disposed in the control room R, for example. The notification device 63 operates based on the evaluation data output from the evaluation data output unit 35. As the notification device 63, a display device for displaying display data and a sound output device for outputting sound are exemplified. Examples of the Display device include a flat panel Display such as a Liquid Crystal Display (LCD) or an Organic EL Display (OELD).

[ brake evaluation method ]

The operating state data acquiring unit 31 acquires operating state data indicating the operating state of the hoist motor 15M (step S1).

In the present embodiment, the operation state of the lifting motor 15M is the operation state of the lifting motor 15M when the lifting brake 15B is changed from the released state to the braked state. The operation state data includes the rotation speed of the hoist motor 15M, the torque of the hoist motor 15M, and the brake time.

The unique data acquiring unit 32 acquires unique data of the brake pads 53 of the lift brake 15B (step S2).

In the present embodiment, the intrinsic data includes the surface area of the brake pad 53 and the wear rate of the brake pad 53.

The state estimating unit 34 calculates the braking energy of the brake pads 53 based on the rotation speed of the elevation motor 15M, the torque of the elevation motor 15M, the braking time, and the surface area of the brake pads 53 (step S3).

The state estimating unit 34 estimates the temperature of the brake pads 53 based on the braking energy of the brake pads 53 calculated at step S3 (step S4).

The evaluation data output unit 35 compares the heat-resistant temperature of the brake pads 53 stored in the storage unit 33 with the estimated temperature of the brake pads 53 estimated in step S4, and determines whether or not the estimated temperature is equal to or higher than the heat-resistant temperature (step S5).

If it is determined at step S5 that the estimated temperature is not equal to or higher than the heatproof temperature (no at step S5), the state estimating unit 34 estimates the amount of wear of the brake pads 53 based on the rotation speed of the lift motor 15M, the torque of the lift motor 15M, the surface area of the brake pads 53, and the wear rate of the brake pads 53 (step S6).

The evaluation data output unit 35 calculates the accumulated wear amount of the brake friction lining 53 in which the estimated wear amount of the brake friction lining 53 calculated in the past and the estimated wear amount of the brake friction lining 53 estimated in step S6 are accumulated (step S7).

The evaluation data output unit 35 compares the adjustment reference value stored in the storage unit 33 with the cumulative wear amount of the brake pads 53 calculated in step S7, and determines whether or not the cumulative wear amount is equal to or larger than the adjustment reference value (step S8).

When it is determined in step S8 that the cumulative wear amount is equal to or greater than the adjustment reference value (yes in step S8), the evaluation data output unit 35 compares the replacement reference value stored in the storage unit 33 with the cumulative wear amount of the brake pads 53 calculated in step S7, and determines whether or not the cumulative wear amount is equal to or greater than the replacement reference value (step S9).

When it is determined in step S9 that the accumulated wear amount is equal to or greater than the replacement reference value (yes in step S9), the evaluation data output unit 35 outputs evaluation data indicating the possibility of excessive wear of the brake pads 53 to the notification device 63. The notification device 63 notifies notification data indicating that the replacement work of the brake pads 53 is required (step S10).

When it is determined at step S9 that the accumulated wear amount is not equal to or greater than the replacement reference value (no at step S9), the evaluation data output unit 35 outputs evaluation data indicating the possibility of wear of the brake pads 53 to the notification device 63. The notification device 63 notifies notification data indicating that the gap adjustment work of the brake pads 53 and the brake pads 52 is required (step S11).

When it is determined at step S5 that the estimated temperature is equal to or higher than the heatproof temperature (yes at step S5), the evaluation data output unit 35 outputs evaluation data indicating the possibility of thermal destruction of the brake pads 53 to the notification device 63. The notification device 63 notifies notification data indicating that the replacement work of the brake pads 53 is required (step S10).

[ computer System ]

Fig. 6 is a block diagram showing an example of the computer system 1000 according to the present embodiment. The control device 20 and the brake evaluation device 30 described above each include a computer system 1000. The computer system 1000 includes a cpu (central Processing unit) processor 1001, a main memory 1002 including a rom (read Only memory) and a ram (random Access memory) volatile memory, a memory 1003, and an interface 1004 including an input/output circuit. The functions of the control device 20 and the brake evaluation device 30 are stored in the memory 1003 as programs. The processor 1001 reads a program from the memory 1003, expands the program in the main memory 1002, and executes the above-described processing in accordance with the program. Further, the program may be transmitted to the computer system 1000 via a network.

According to the above-described embodiment, the program enables the computer system 1000 to execute a brake evaluation method including a step of acquiring operating state data indicating an operating state of an electric motor that drives a rotating body, a step of acquiring specific data of a brake component that brakes a disc brake of the rotating body, and a step of estimating a state of the brake component based on the operating state data and the specific data.

[ Effect ]

As described above, according to the present embodiment, the state of the brake lining 53 including the temperature and the amount of wear can be estimated based on the operating state data of the lift motor 15M and the specific data of the brake lining 53. Therefore, the timing of performing the maintenance work of the disc brake can be appropriately determined.

The deck crane 10 is arranged at a height of about 10m from the deck 102. In many cases, a plurality of deck cranes 10 are provided on the deck 102. Therefore, there is a tendency to ignore the maintenance of the disc brake. The deterioration state of the disc brake varies depending on the ship 101 on which the deck crane 10 is mounted and the load handled by the deck crane 10. In addition, the deck crane 10 moves together with the vessel 101, and therefore, the opportunity for maintenance work is limited. Therefore, it is desirable to accurately grasp the deterioration state of the disc brake.

In the present embodiment, the state of the brake lining 53 including the temperature and the amount of wear is estimated based on the operating state data of the lift motor 15M and the unique data of the brake lining 53. This makes it possible to appropriately determine the timing of performing the maintenance work of the disc brake without being affected by the strength of the maintenance worker, for example.

[ other embodiments ]

In the above-described embodiment, the state estimating unit 34 estimates the state of the brake pads 53 of the lifting brake 15B based on the operating state of the lifting motor 15M when the lifting brake 15B is changed from the released state to the braked state. The state estimating unit 34 may estimate the state of the brake pads 53 of the lifting brake 15B based on the operating state of the lifting motor 15M when the lifting brake 15B is changed from the braking state to the released state. That is, the state estimating unit 34 may estimate the state of the brake pads 53 of the lifting brake 15B based on the operating state of the lifting motor 15M in the braking state before the lifting brake 15B is released. For example, when the lift brake 15B is in the braking state while the load is held by the holder 18H, and the lift brake 15B is in the released state from the braking state, the lift wire 18 is lowered by the weight of the load, and the drum 15D may be rotated only in a state where the brake lining 53 and the brake pad 52 are in contact. That is, when the brake state is changed to the release state, the brake lining 53 and the brake pad 52 may relatively rotate while being in contact with each other. As a result, the temperature of the brake pad 53 increases, and the brake pad 53 may wear. The state estimating unit 34 can estimate the temperature or wear of the brake lining 53 of the hoist rope 18 due to the weight reduction of the load by estimating the state of the brake lining 53 of the hoist brake 15B based on the operating state of the hoist motor 15M when the hoist brake 15B is changed from the braking state to the released state. When estimating the state of the brake pads 53 based on the operating state of the lifting motor 15M when the lifting brake 15B is changed from the braking state to the release state, preset values may be used as the operating state (the rotation speed, the torque, and the braking time) of the lifting motor 15M. For example, the state of the brake pads 53 can be estimated according to the above-described embodiment using the representative value of the operating state of the lifting motor 15M obtained in the past when the lifting brake 15B is changed from the open state to the braking state.

In the above-described embodiment, the state of the brake lining 53 of the lift brake 15B is estimated based on the operating state of the lift motor 15M that drives the drum 15D that is a rotating body that moves the lift wire 18 of the deck crane 10 up and down. The state of the brake pads 53 of the rotary brake 13B can also be estimated based on the operating state of the rotary motor 13M. The state of the brake pads 53 of the pitch brake 14B can also be estimated based on the operating state of the pitch motor 14M.

In the above embodiment, the state of the brake pads 53 is estimated. The state of the brake pads 52 can also be estimated.

Claims

1. A brake evaluation device is provided with:

an operating state data acquiring unit that acquires operating state data indicating an operating state of an electric motor that drives the rotating body;

a unique data acquisition unit that acquires unique data of a brake member of a disc brake that brakes the rotating body;

a state estimating unit that estimates a state of the brake member based on the operating state data and the unique data;

the operating state data includes a rotational speed of the electric motor and a torque of the electric motor,

the intrinsic data includes a surface area of the brake component and a wear rate of the brake component,

the state of the brake component includes an estimated amount of wear of the brake component,

further comprising an evaluation data output unit for comparing a reference value with a cumulative wear amount obtained by accumulating the estimated wear amount and outputting evaluation data of the brake member,

the reference values include an adjustment reference value for a clearance adjustment operation of the disc brake and a replacement reference value for a replacement operation of the brake member,

the replacement reference value is larger than the adjustment reference value.

2. The brake evaluation device according to claim 1,

the operating state data further includes a braking time until the rotating body stops,

the state estimating unit calculates the braking energy of the braking member based on the rotation speed of the electric motor, the torque of the electric motor, the braking time until the rotating body stops, and the surface area of the braking member,

the state of the braking component includes an estimated temperature of the braking component calculated from the braking energy.

3. The brake evaluation device according to claim 2,

the evaluation data output unit includes an evaluation data output unit that outputs evaluation data of the brake member based on the heat-resistant temperature of the brake member and the estimated temperature.

4. The brake evaluation device of claim 3,

the rotating body lifts and lowers a hoist rope of a crane.

5. The brake evaluation device of claim 4,

the state estimating unit estimates the state of the braking member based on the operating state of the disc brake when the disc brake changes from an open state to a braking state.

6. A brake evaluation method, comprising the steps of:

a step of acquiring operating state data indicating an operating state of an electric motor that drives the rotating body,

A step of acquiring data specific to a brake member of a disc brake for braking the rotating body,

Estimating a state of the brake member based on the operating state data and the unique data,

further comprising a step of comparing a reference value with an accumulated wear amount accumulated based on the estimated wear amount and outputting evaluation data of the brake member,

the replacement reference value is larger than the adjustment reference value.