JPH0597385A - Monitoring of deceleration distance of crane - Google Patents

Abstract

(57) [Summary] [Purpose] To detect an abnormality during deceleration at an early stage by monitoring the deceleration distance at the time of stop during traveling by a crane, hoisting or lowering. [Configuration] When monitoring the deceleration distance when traveling by a crane or when stopping such as hoisting or lowering, the position detector 4 reads the position at the time when deceleration command R is issued to start deceleration, and then the sequencer 5 The position detector 4 reads the position at the time when the speed detector 3 detects that the rotation of the electric motor 2 has become zero into the sequencer 5, and the position at the time when the deceleration is started and the rotation of the electric motor 2 become zero. The difference from the position at the time of is set as the deceleration distance, and this deceleration distance is compared with the preset deceleration distance in the sequencer 5, and an alarm output S is output in the event of an abnormality to monitor the abnormality of the deceleration distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deceleration of a crane used for monitoring a deceleration distance when a movement is stopped in a crane used for moving the articles in the front-rear direction, the left-right direction, the up-down direction and the tilting direction. It relates to a distance monitoring method.

[0002]

2. Description of the Related Art Cargo handling machines used for moving goods include hoisting units such as chain blocks, hoists and table lifters, cranes such as jib cranes, wall cranes, overhead cranes and bridge cranes. ,
There are various types such as mobile cranes such as truck cranes and wheel cranes.

[0003] For example, in an overhead crane, a ladle crane used for moving and operating a ladle is provided with a girder that moves along the ceiling, a main club and an auxiliary club installed on the girder, and the main club. There is also a structure having a main winding hook (ladle hook) and an auxiliary winding hook provided on the auxiliary club.

Similarly, in an overhead crane, a steel ingot crane used for transporting an ingot holds a steel rod that moves along the ceiling, a club provided in the digit, and a steel ingot provided in the club. There is a structure having a tongue and an auxiliary winding hook provided on the club.

[0005]

In a crane used for carrying or operating such articles as a ladle and steel ingot, the accuracy of carrying or operating is maintained / improved, and the operation of the crane that does not rely on human labor is rationalized. However, there was a problem that early detection and repair of abnormal crane parts were required.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in particular, by monitoring the deceleration distance among the acceleration / deceleration distance during traveling by a crane, hoisting and lowering, From the standpoint of monitoring the deceleration distance, the purpose is to maintain and improve the accuracy of transportation of goods by crane or operation accuracy, rationalize crane operation that does not rely heavily on human labor, and enable early detection and repair of abnormal points.

[0007]

SUMMARY OF THE INVENTION The present invention detects the position at the time when a deceleration command is issued and deceleration is started when monitoring the deceleration distance when stopped by traveling by a crane, hoisting or lowering. The position detector reads the position at the time when the rotation of the motor becomes zero, and then the position detector reads the position at the sequencer, and the position at the time when the deceleration is started and the position when the rotation of the motor becomes zero. The difference between the position and the deceleration distance is used as a deceleration distance, and this deceleration distance is compared with a preset deceleration distance in the sequencer to monitor the deceleration distance for abnormalities. The structure of the invention relating to the method serves as means for solving the above-mentioned conventional problems.

[0008]

In the method for monitoring the deceleration distance of the crane according to the present invention, the position detector reads the position at the time when the deceleration command is issued to start deceleration, and the position detector reads the position, and then the traveling, hoisting, hoisting, etc. The position detector reads the position at the time when the rotation of the electric motor used becomes zero into the sequencer, and the position at the time when the deceleration is started and the position when the rotation of the electric motor becomes zero. The deceleration distance is defined as the deceleration distance, and this deceleration distance is compared with the preset deceleration distance in the sequencer to issue an alarm when there is a difference between them or when there is a predetermined difference between them. Since abnormalities in deceleration are monitored by using this method, abnormalities during deceleration can be detected early, and appropriate repairs can be performed to transport or manipulate ladle, steel ingots, and other items. Maintaining accuracy or improving the like, rationalization of the crane operation that does not rely on many manpower is realized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a deceleration distance monitoring control system adopted in an embodiment of the crane deceleration distance monitoring method according to the present invention. A motor control panel 2 for controlling movement, vertical movement, tilting (or tipping) direction movement, etc., 2 is an electric motor controlled by the electric motor control panel 1, and 3 is a speed of the electric motor 2. In this embodiment, the speed detector 3 has a structure for obtaining the speed based on the number of pulse generations per time.

Reference numeral 4 is a position detector for detecting the position at the time when the deceleration command R is issued and the deceleration is started, and the position at the time when the rotation of the electric motor 2 becomes zero thereafter. In this embodiment, the position detector 4 has a structure for detecting the position by the number of integrated pulses from the reference position.

Further, 5 is a sequencer for inputting the position at the time when the deceleration command R is issued to start deceleration through the position detector 4 and thereafter the rotation of the electric motor 2 becomes zero. Is provided by the position detector 4 with the position at the time when is detected by the speed detector 3. In the first controller 5a, the position at the time when the deceleration is started and the electric motor 2 are provided. The difference from the position at the time when the rotation becomes zero is output as the deceleration distance.

Further, the sequencer 5 compares the deceleration distance output from the first control section 5a with a preset deceleration distance, and when there is a deviation between the deceleration distances of the both, or a predetermined deceleration distance of the both. If there is a difference between the two, a second control unit 5b for outputting an alarm output S is provided.
The adjustment of the difference between the two deceleration distances when the alarm output S is issued in b is adjusted by the set value adjuster 5c. In the deceleration distance monitoring control system shown in FIG. 1 having such a configuration, the time t ₁ shown in FIG.
Until then, the electric motor 2 rotates at a desired operation speed according to the speed command, and the overhead traveling of the crane at a desired speed, hoisting at a desired speed, lowering at a desired speed, and the like are performed.

Thereafter, when the deceleration command R is issued at time t ₁ in FIG. 2, the speed decreases and the deceleration starts,
The position at the time (t ₁ ) when the deceleration is started is input from the position detector 4 to the first controller 5a of the sequencer 5 and read.

Further, the deceleration is continued, and the time t _{2 in} FIG.
The speed detector 3 detects that the rotation of the electric motor 2 has become zero, and the position detector 4 determines the position at the time (t ₂ ) when the rotation of the electric motor 2 has become zero. It is input to and read from the first control unit 5a.

In the first control section 5a, the difference between the position at the time when the deceleration is started (t ₁ ) and the position at the time when the rotation of the electric motor 2 becomes zero (t ₂ ) is shown. The deceleration distance L is calculated as shown in 2
The control unit 5b compares the deceleration distance L with a preset deceleration distance, and issues an alarm output S when there is a deviation or a predetermined difference.

When the alarm output S is issued, the cause of the deceleration distance not being a predetermined value is investigated, and appropriate repairs are performed if necessary.

In a ladle crane for carrying and operating a ladle in one example of implementation, as shown in Table 1, the set value of the deceleration distance at the time of the main lowering of the main hoist for raising and lowering the ladle is 320 mm. And the set value of the deceleration distance for auxiliary lowering of the auxiliary winding that tilts and falls the ladle is 4
00mm, and the set value of the deceleration distance when traveling is 4,20
It was set to 0 mm.

As also shown in Table 1, the actual value of the deceleration distance during the main winding is 280 mm, and the actual value of the deceleration distance during the auxiliary lowering is 350 mm. Since the actual value of the distance is 4,000 mm, it is judged to be normal because all of them are within the set values. However, when the set values are exceeded, the second controller 5b of the sequencer 5 outputs the alarm output S. Decided to issue an alarm.

[0019]

[Table 1]

By doing so, it becomes possible to detect abnormalities early during traveling by a crane, during main hoisting and lowering, and during deceleration during auxiliary hoisting and lowering.

[0021]

The method for monitoring the deceleration distance of a crane according to the present invention, when monitoring the deceleration distance at the time of stopping by traveling by the crane, hoisting, hoisting, etc., when the deceleration command is issued and deceleration is started, The position detector reads the position into the sequencer, and then the position detector reads the position at the time when the motor rotation becomes zero, and the position detector reads the position into the sequencer, and the position at the start of deceleration and the motor rotation become zero. The difference from the position at the time
This deceleration distance is compared with the preset deceleration distance in the sequencer to monitor the deceleration distance for abnormalities, so it is possible to detect abnormalities during deceleration during traveling, hoisting or lowering by a crane at an early stage. It becomes possible, and by performing appropriate repairs, it is possible to maintain or improve the accuracy of transportation or operation of articles such as ladle and steel ingot, and to realize the rationalization of crane operation that does not rely heavily on human labor. The effect is brought.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of a deceleration distance monitoring control system adopted in an embodiment of a crane deceleration distance monitoring method according to the present invention.

FIG. 2 is an explanatory diagram showing the relationship between speed and time during deceleration in an embodiment of the method for monitoring the deceleration distance of a crane according to the present invention.

[Explanation of symbols]

 1 Motor Control Panel 2 Motor 3 Speed Detector 4 Position Detector 5 Sequencer 5a Sequencer First Control Unit 5b Sequencer Second Control Unit 5c Setpoint Adjuster R Deceleration Command S Alarm Output

Claims (1)

[Claims] 1. When monitoring the deceleration distance when stopped by traveling by a crane, hoisting or lowering, etc., the position detector reads the position at the time when the deceleration command is issued and the deceleration starts, and then the electric motor. The position detector reads the position at the time of zero rotation into the sequencer, and the difference between the position at the time when the deceleration is started and the position at the time when the motor rotation becomes zero is the deceleration distance. A method for monitoring the deceleration distance of a crane, characterized in that the deceleration distance and a preset deceleration distance are compared in a sequencer for abnormal monitoring of the deceleration distance.