JPS60168928A - Detection of brake abrasion - Google Patents

Abstract

PURPOSE:To achieve automatic detection of brake abrasion by operating the brake distance from position detecting signals upon throw-in of brake and during interval when speed detection signal is detecting stoppage then comparing with setting level. CONSTITUTION:When detecting abrasion of brake 7 provided on a hoist in loading/unloading machine such as container crane, the timing when brake throw-in signal S1 will be 1 under operation of operational lever is caught to provide the output signal from position detector 12 to CPU 23 and store the detected signal A1 into memory 24. Upon throw-in of brake, complete stoppage of system is decided from the output of speed detector 11 to store the signal A2 detected through position detector 12 under stoppage into memory 24. Then the brake distance A is operated from two values A1, A2 and compared with setting level A0 to detect abrasive condition of brake 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a brake wear detection method for detecting the state of brake wear.

[Background of the invention]

Cargo handling machines such as container cranes and unloaders are equipped with machines such as hoisting devices and moving devices. The driving force supply source for the hoisting device and the moving device is usually a rotary drive machine such as a motor or an engine. After driving this rotary drive machine,
Speed control and stopping are essential for operation, and it is well known that various types of brakes are used for this purpose.

As brakes are used, brake shoes and other parts wear out, which reduces braking force.
Brake maintenance and inspection are required at appropriate times. The degree of wear on the brakes or the performance of the brakes can be determined by the distance traveled from when the brakes are applied until they are stopped, that is, the braking distance.

Note that conventionally, a pulse encoder was attached to the drive motor.
A technology has been announced that detects the number of rotations from braking to stopping and compares this with a standard value to determine brake performance (Japanese Patent Application Laid-Open No. 100086/1986). An object of the present invention is to provide a brake wear detection method that can automatically detect brake wear.

[Summary of the invention]

The present invention inputs a brake application signal, a speed detection signal 9, and a position detection signal, and stores the position detection signal at the time of human input of the brake application signal as a first value.
The position detection signal during the period in which the speed detection signal detects the stopped state is stored as a second value, and the braking distance is calculated based on these first and second values. It is characterized by detecting brake wear by comparing the value with a preset value.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on specific examples. First, FIG. 1 shows a schematic diagram of a container crane to which the present invention is applied. The crane main body l moves on the traveling rail 2. When lifting a container 6 on a ship, the traversing device 4 is moved to the ship side, a lifting spreader 3 is lowered, and the container 6 is lifted by this spreader 3.

The hoisted container is transported to the land side by the traverse of the traversing device ~4, and lifted onto land by lowering the spreader 3. The traversing device 4 is equipped with a hoisting device for hoisting and lowering the spreader. has been done. 5 is the electrical machinery room, which houses the control panel for the first shift.

FIG. 2 shows a schematic diagram of the hoisting device. speed detector 12;
The brake 7 and the hoisting motor 8 are directly connected to each other. The drum IO is connected to a hoisting motor 8 via a speed reducer 9. A position detector 11 that detects the position is directly connected to the drum 10. In this example, a synchronized generator is used as the position detector.

Now, an embodiment of the present invention that specifically implements the method of the present invention is shown in FIGS. 3 and 4. FIG. 3 is a hardware system configuration diagram in an embodiment of the present invention, and FIG. 4 is a system operation flow diagram in the embodiment of the present invention.

First, the Bart system will be explained with reference to FIG. Additionally, there is a microcomputer unit that detects brake wear. This unit includes the following components 21-25. 21 is an Al1) converter that converts an analog signal into a digital signal. n is a process input/output device! ! ! , (PIlo). The field is the central processing unit (CP).
U), which performs data input and output, data storage, arithmetic processing, etc. according to a program built into the memory. Another is memory that stores programs and data. δ is a serial transmitter that converts the calculation result into a serial signal and outputs it to the transmission line, and conversely inputs information on the transmission line. Chrysanthemum is a display device that displays calculation results (detection results), and numerals 9 and 13 are weight detectors. Sl
is the brake application signal, S2 is the maintenance signal,
These are each input as contact signals, and PI10ρ
It is taken into the unit 20 via. Next, the operation will be explained using FIGS. 3 and 4. Calculation of braking distance and detection of brake wear are performed when the mode selector switch is set to "maintenance". That is, it is executed when the signal S2 is in the 1# state. The lowering operation of the hoisting device is performed by operating a control lever in the driver's cab.

When the operating lever is placed in the ``one hoist down'' position, the brake is energized and the hoisting operation begins. When the brake is excited, a brake signal is applied, and the lowering start timing can be detected. When the lowering is completed, the operation lever is returned to the neutral position, thereby cutting off the excitation of the brake and applying the brake. Thereafter, the lowering is completed (stopped) by this brake. In the process of completing this lowering, the excitation of the brake is cut off, so that the brake application signal S1 becomes 1#.

Therefore, capturing this timing, the CPU phantom inputs the output of the position detection signal and stores this detection signal A1 in the memory.
) Stored in 24. This detection signal A will be referred to as a first value. Next, at this point, due to inertia, even if the brakes are normal, it cannot be stopped, and the vehicle will wind down slightly. After applying the brakes, whether or not the Somaro has completely stopped can be determined by inputting the detection signal from the speed detector 11. Therefore, it can be determined whether the Somaro has completely stopped or not, so it can be determined by inputting the detection signal of the speed detector 11. Then, the detection signal of the position detector 2 is inputted again and stored in the memory 24.

The detection signal at this time is referred to as A2, and is referred to as a second value.

After storing the second value, CPUZ3 stores the first value A1 and the second value A1.
The braking distance A is calculated by reading out the value A2 from the memory. This calculation formula is as follows.

A=A, -A2 ・・・・・・・・・・・・・・・
...+11 This braking distance A is transmitted via the serial transmitter 5 to the display position (for example, CRT) 30 and displayed. Then, in CPUZ3, this braking distance A
The wear condition of the brakes is detected using The easiest way to perform this detection is to use the setting value A.

This can be determined by comparing the calculated value A.

By setting a plurality of these set values A0, for example five, the degree of brake wear can be detected in more detail. [T-Top I] When performing accurate detection,
The following method will be adopted. That is, braking distance A is A1
However, this value varies depending on external conditions. In particular, in the case of a lowering device, the braking distance A varies greatly depending on whether a load is suspended or not. It also varies greatly depending on the weight of the suspended load.Therefore, in this embodiment, a weight detector 13 is installed to detect the suspended load, and this is used to compensate for the braking distance. The braking distance compensation amount aW due to changes in weight is determined through experiments and the like, and this is stored as a table in the memory U. Therefore, when the braking distance A is calculated by the CPU 23, the following equation is used.

A' == A, -A2- aW = A -aW (2) However, A': The selection of the braking distance aW after compensation is based on the detected value of the weight W. This can be realized by inputting a W and finding an aW that matches this W from a table. The weight W may be specified using a keyboard or the like. Note that braking distance compensation can also be realized using the following equation.

A'-bW・(A,-A2)-bW-A (3) However, according to this embodiment, the compensation coefficient is set in advance for each job: weight W. wear can be detected automatically and with high precision, allowing for early detection of abnormalities or selection of appropriate maintenance and inspection timing.

〔Effect of the invention〕

As explained below, according to the present invention, brake wear can be automatically detected.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a container crane, FIG. 2 is a schematic diagram of a lifting device, and FIGS. 3 and 4 are diagrams of an embodiment of the present invention. 11...Speed detector, 12...Position detector, 13...Weight detector, addition...Microcomputer unit, 21... A/Di
converter, n...process input/output device, n...
・Central processing unit, Sae...Memory, 6...Serial transmitter, addition...Display device

Claims (1)

[Claims] 1. Input the detection signals of the speed detector and position detector attached to the rotary drive machine and the input signal of the boogie to the rotary drive machine, and use the detection signal of the position detector at the time of inputting the input signal as the first input signal. At the same time, the detection signal of the hindlimb speed detector is stored as a second value during the period in which the stopped state is being detected, and the detection signal of the hindlimb speed detector is stored as a second value, and the detection signal of the hindlimb speed detector is stored as a second value. A brake wear detection method comprising: calculating a braking distance based on a value of , and detecting brake wear by comparing the calculated braking distance with a preset value.