KR101095622B1 - Safety supervision system in crane work and method thereof - Google Patents

Abstract

The present invention relates to a system and method for preventing accidents caused by a crane or a product carried by a crane colliding with workers, in particular, in the same direction as the product carried by the crane among the components of the crane and Wireless tag provided on one side of the component and the operator to perform the movement at speed; A wireless tag recognition device for determining whether the wireless tag is located within a communication distance provided at another side of the worker and a component that performs movement in the same direction and speed as the product carried by the crane among the components of the crane; And a controller for controlling a crane to perform a work set to be performed when it is determined that the radio tag and the radio tag recognition device are located within a communicable distance, and the operator is determined to be in a dangerous area. A crane work safety management system characterized by and a method performed by the system.

According to the present invention, there is an advantage to automatically detect whether the operator is located in the danger zone to prevent the collision between the worker and the product carried by the crane or crane.

Crane, safety, danger

Description

Safety supervision system in crane work and method

The present invention relates to a work safety management system and method of a crane, and more particularly, to a system and method for preventing accidents caused by a collision of a product carried by a crane or a crane with workers.

A crane is a mechanical device that lifts loads and lifts them up, down, left, and right before and after, and carries various building materials and parts at construction sites and shipyards, or unloads products loaded on ships in ports or vice versa. It is used for activities such as shipping.

In the case of transporting the product using a crane, the product is first fixed to the crane, and then the product is lifted and moved using the power of the crane.

At this time, the part where the crane and the product are connected is composed of a flexible member such as a chain, a rope, and the like, such that the worker moves the product or rotates the product while the product is suspended from the crane in the air. This is possible, and the operator manually performs the work of connecting the rope and the product of the crane.

For example, when a product is shipped to a ship, a driver is aboard the driver of a product loading crane, and a worker uses a hand signal or wireless communication at the bottom of the crane for hoisting on a land pallet and rope hooking in the ship. The crane driver is instructed to position the crane or the product in such a manner as to provide information for controlling the crane.

In order to do this, when a crane carries a product or moves to carry a product, a worker often stands around the moving path of the crane to perform work. It requires attention.

In particular, when the operator does not always pay attention to the movement of the crane or the product or the driver of the crane obstructs the field of view due to the crane or product, etc., there is a possibility that a big accident may occur, there is a problem.

However, in the related art, a system for preventing such an accident has not been developed in advance, and in order to prevent such an accident, there was only a method of paying attention to the operators and operators of the crane.

In order to solve the above problems, an object of the present invention is to provide a system and method for preventing an accident caused by a collision between a worker and a product carried by a crane or a crane when working with a crane.

In order to achieve the above object, the present invention is a component of the crane from the radio tag recognition device provided on one side of the component and the worker to perform the movement in the same direction and speed as the product carried by the crane among the components of the crane Receiving information that the component to perform the movement in the same direction and speed of the product carried by the crane and the wireless tag provided on the other side of the worker is located within the communication range; And controlling the crane to perform a work set to be performed when it is determined that the worker is in a dangerous area when receiving the information.

In addition, the present invention to achieve the above object is a wireless tag provided on one side of the component and the operator to perform the movement in the same direction and speed as the product carried by the crane of the components of the crane; A wireless tag recognition device configured to perform movement in the same direction and speed as the product carried by the crane among the components of the crane and the other side of the worker to determine whether the wireless tag is located within a communication distance; And a control unit for controlling a crane to perform a work set to be performed when it is determined that the radio tag and the radio tag recognition device are located within a communicable distance, and the operator is determined to be in a dangerous area. A crane work safety management system is provided.

Here, the crane work safety management system measures the height of the components of the crane to perform the movement in the same direction and speed as the product carried by the crane or the height of the bottom of the product carried by the crane It further comprises a height measuring unit, wherein the control unit is to control the crane so that the operation is set to be performed when it is determined that the operator is in the danger zone only when the height measured by the height measuring unit is within the set range desirable.

The wireless tag recognition apparatus may further include a wireless tag recognition unit recognizing that the wireless tag is located within a communication range when receiving the radio wave transmitted from the wireless tag; And a communication unit for transmitting the information to the control unit when the wireless tag recognition unit is recognized to be located within a communication distance of the wireless tag.

In addition, the job set to be performed when it is determined that the worker is in the danger zone, it is preferable to stop the movement of the crane.

In addition, the height measuring unit preferably measures the height of the lower end of the product to be conveyed by a two-dimensional laser scanning method.

On the other hand, in order to achieve the above object, the present invention provides a computer readable recording medium having recorded thereon a program for realizing the above method.

According to the present invention, there is an advantage that can automatically detect whether the operator is located in the danger zone to prevent the collision between the worker and the product carried by the crane or crane.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of the present invention.

The system of the present invention relates to a work safety management system used for a crane used for product shipment, and includes a wireless tag 110, a wireless tag recognition device 120, a control unit 130, and a height measuring unit 140 in the system. Characterized in that.

In the present invention, the radio tag and the radio tag recognition device is provided in one of the components and the worker moving in the same direction and speed as the product to be transported among the components constituting the crane, such as a hoist.

That is, when the wireless tag recognition device 120 is provided to the hoist, the worker is to carry clothes, safety equipment, belongings, etc. equipped with the wireless tag 110, and the worker is provided with the wireless tag recognition device 120 The crane components such as hoists

Representative of the components that move in the same direction and speed as the product carried in the crane may be a hoist provided in the crane.

Which component of the radio tag 110 and the radio tag recognition device 120 should be provided to the operator can be arbitrarily set by the system designer.

However, in general, the price of the radio tag recognition device is higher, and in that a number of workers are arranged in one crane, the radio tag recognition device 120 is installed on the crane, and each worker has a radio tag 110 attached thereto. It would be desirable to carry work clothes, safety equipment, belongings, etc.

The radio tag 110 is a device represented by an RFID (Radio Frequency IDentification) tag, and is a small device capable of transmitting identification information stored therein through an RF signal.

The wireless tag may have its own power supply, and may use a method of outputting an RF signal including its own identification information using the provided power source, and generate power using the received radio wave by receiving a radio wave from the outside. It is also possible to use a method of outputting a signal using the power generated in this way.

Since the main reason for using the radio tag in the present invention is to determine the distance between the worker with the radio tag and the components that may collide with the operator among the components of the crane, each radio tag 110 The identification information transmitted from may be different for every radio tag, but it is not necessary and all radio tags may transmit the same identification information.

The wireless tag recognition device 120 recognizes a wireless tag when the wireless tag 110 is located within a communication distance, and transmits information indicating that the wireless tag 110 is recognized to the controller 130.

Since the communicable distance of the radio tag 110 varies depending on the strength of the radio wave output from the radio tag 110 and the frequency used, the system designer can adjust the communicable distance according to the design intention.

2 is a block diagram showing the internal configuration of the radio tag recognition device 120.

The radio tag recognition device 120 of the present invention includes a radio tag recognition unit 121 and a communication unit 122.

When the radio tag recognition unit 121 receives a radio wave received from the radio tag 110, the radio tag recognition unit 121 determines whether the radio wave is received from the radio tag included in the system of the present invention.

When the wireless tag 110 does not have its own power source, the wireless tag recognition unit 121 generates radio waves in a frequency band in which the wireless tag 110 can generate power, so that the wireless tag 110 supplies power. When the radio tag 110 is powered by itself, the radio tag 110 receives only the radio wave received from the radio tag 110 without generating a radio wave, and the radio tag 110 is within a communication range with the radio tag. Recognizes whether or not) exists.

When the wireless tag recognition unit 121 recognizes that the wireless tag 110 is present within the communication radius, the communication unit 122 transmits the information to the control unit 130.

The communication method in the communication unit 122 will generally take the form of wireless communication, but wired communication may also be possible. When the workers carry the wireless tag recognition unit 121, it may be a little difficult to take the wire communication method, but if the wireless tag recognition unit 121 is provided in the crane, even if using the wire communication method, communication line processing, etc. This will not be so complicated, so it will be possible.

The controller 130 uses the height of the lower portion of the crane or the height of the product and the distance between the wireless tag recognition device 120 and the wireless tag 110 when the operator is determined to be located in the danger zone, the crane is set Control to perform the operation.

Here, the set operation may be arbitrarily set by the system designer.

An example that can be used in such an operation is as follows.

First of all, you can get the operator's attention by making a warning sound and the announcement like "Hoist is down".

In another example, the crane is stopped. When it is determined that the worker is located in the danger zone, the crane can be stopped and moved again when the operator leaves the danger zone or when the operator operates the crane driver again.

There are many ways to determine if an operator is in a hazardous area.

Primarily, a wireless tag recognition device 120 (or a wireless tag) provided in a component moving in the same direction and speed as a product to be transported among components constituting the crane, such as a hoist of a crane, and a wireless tag provided by an operator. If 110 (or radio tag recognition device) is located within the communication radius of each other can be set to determine that the operator is in the danger zone.

For example, when the wireless tag 110 and the wireless tag recognition device 120 is within 4m, if the wireless tag recognition device 120 can recognize the wireless tag 110, the wireless tag recognition device 120 and wireless The area where the linear distance of the tag 110 becomes 4 m is designated as a danger area, and when an operator is present in this area, a warning sound may be generated or the crane may be stopped.

However, in this case, as the hoist of the crane is lowered gradually, the danger area becomes wider and the workers have to draw back more and more.

In other words, when the down work of the crane is almost finished, the workers should come to perform detailed position adjustment or to fix the product on the rope of the crane.For this work, the crane will stop and beep when the worker approaches. This may also have the disadvantage of being generated.

In order to solve this disadvantage, the following method may be introduced.

In order to determine whether the operator is in the danger zone, it is not merely to determine whether the radio tag 110 and the radio tag recognition device 120 are located within a communicable distance, but are carried by the crane among the components of the crane such as a hoist. By combining the height of the component (hereinafter referred to as a 'hoist') or the height of the product and the distance between the wireless tag 110 and the wireless tag recognition device 120 that moves in the same direction and speed as the product, an operator may You can determine if you are in.

That is, when the bottom of the crane is lowered to some extent or more, even if the distance between the wireless tag 110 and the wireless tag recognition device 120 is within the communication range, the worker is not recognized as a case where the danger zone is located, work Let this continue.

3, an example will be described. 3 shows an example of a crane used to load a coil into a ship on land.

In FIG. 3, it is assumed that interference by an operator may occur based on the height of the short beam 201, that is, it is determined that the operator is in a dangerous area, and assuming that the height of the pallet 202 is 2 m above the ground, The maximum height is about 4m from the ground.

In this case, if the height C of the short beam is 6 to 8 m, that is, if the short beam is located 2 to 4 m above the worker, whether the operator is in the danger zone, that is, whether the operator can interrupt the crane's work. When judging whether or not the short beam is 6 ~ 8m from the ground when the radio tag recognition device 120 recognizes the radio tag 110 to stop the movement of the crane or to set the operation such as warning broadcasts come out When the short beam is out of the above range, for example, when the height of the short beam is 5 m, it is preferable not to interrupt the interrupt even when the radio tag recognition device 120 recognizes the radio tag 110.

Although the above description has been made based on the short beam, all of the components of the crane that move in the same direction and speed as the products carried by the crane will move by the same distance, and thus, among the above components.

The height of the bottom of the crane or the height of the product determines the height measuring unit 140.

The height measuring unit 140 may measure the height of the bottom of the crane or the height of the product can be largely two methods.

First, the height can be measured by measuring the internal operation of the crane.

In the case of the crane as shown in FIG. 3, the height of the transverse girder 204 is fixed, and the height of the hoist 203 is variable by the string, so that the height of the hoist 203 can be known by checking how loose the string is. In addition, when the height of the hoist 203 is known, the height of the component that maintains a constant distance from the hoist, such as the short beam 201, is naturally calculated.

The height measuring unit 140 measures the degree of unwinding using a variety of conventional sensors such as a sensor for measuring the degree of passage of the string or a sensor (Absolute Encoder) for measuring the degree of rotation of the rotating shaft. The height of each component of the crane is measured and transmitted to the controller 130.

The height of the bottom of the product can also be calculated if the product's specifications are constant.

If there is no big change even if the product's standard is not constant, measure the height of the bottom of the product using the average standard value of the product.

Another method of measuring the height of the bottom of the product is a method of measuring the height of the bottom of the product through a two-dimensional laser scan method.

Figure 4 shows a method of measuring the height of the bottom of the product (coil) using a 2D laser scan method.

Referring to FIG. 4, the height measuring unit 140 includes two lasers and measures the height of the lower end of the product in the following manner.

First, find out the outer diameter of the coil using the first laser. The outer diameter of the coil is H2 + H3, H2 = L2 * sin (S2), and H3 = L3 * sin (S3).

The second laser finds the height of the upper coil. If H1 = L1 * cos (S1) and the height H4 of the laser No. 2 is measured in advance, the height of the coil top is H4-H1, so it can be easily seen.

When the height of the upper coil and the outer diameter of the coil are obtained, the height C2 of the lower coil is determined as follows.

C2 = H4-(H1 + H2 + H3)

Techniques for measuring the shape of the object or the distance to the object using a laser are well known techniques, and thus detailed descriptions thereof will be omitted.

5 is a flow chart illustrating a method of the present invention.

The present invention can be applied to all cases, but mainly applied if the crane descends in a state with or without the product will be described with a focus on this.

Although not shown in FIG. 5, the controller 130 may grasp the type of work of the current crane and output voice information according to the type of work.

Referring to the case of a crane loading a product on a ship in a port or the like as shown in Fig. 3 and 4 as an example, whether the crane is currently in the work of descending to load the product on the crane, whether the lifting operation to move the product on the land, at the sea Whether you are working to lower the product to the ship, whether you are lifting the product from the sea side and then lifting it up, or whether you are moving the land from the sea side to the sea side or parallel from sea side to the land side. Figure out.

According to this operation, the control unit 130 said, “The crane is moving on the sea side. Please evacuate from the safety zone. ”,“ The hoist is down. Please evacuate from the safety zone. ”According to each task, you can output the corresponding voice information.

In the case of the descent operation, whether the height of the component that moves in the same direction and speed as the product carried by the crane among the components of the crane, such as the product or hoist through the height measuring unit 140 is located within the set height range The measurement result is transmitted to the control unit 130 (401).

The height range can be arbitrarily set by the system designer.

The height measuring unit 140 may transmit to the control unit 130 whenever the height of the hoist or the bottom of the product is measured, and notifies the control unit 130 only when the measured height is within the set height range. You can also send height information.

If it is within the set height range (402), the controller 130 checks whether the information that the radio tag 110 is recognized from the radio tag recognition device 120 is received (403), if the information is not received The operation to be performed is continuously performed (404), and if it is determined that the radio tag 110 is recognized, the operation set as the operation to be performed when the operator is determined to be in the danger zone is performed (405).

A task set to be performed when the operator is determined to be in a danger zone may be a simple warning broadcast, and the task is stopped until the operator is determined to be out of the danger zone or until the crane operator makes a separate operation. Interrupt can be made as much as described above.

The method of the present invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission via the Internet) . The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

1 is a block diagram showing a configuration of the present invention

Figure 2 is a block diagram showing the configuration of a radio tag recognition device of the present invention

3 is a view for explaining an embodiment of the present invention.

4 is a view for explaining a method of measuring the height of the bottom of the product using a two-dimensional laser scan method in the present invention

5 is a block diagram illustrating the method of the present invention.

Claims (10)

delete Wireless tag provided on one side of the component and the operator to perform the movement in the same direction and speed of the product carried by the crane of the components of the crane; A wireless tag recognition device for determining whether the wireless tag is located within a communication distance provided at another side of the worker and a component that performs movement in the same direction and speed as the product carried by the crane among the components of the crane; A control unit for controlling a crane to perform a work set to be performed when it is determined that the radio tag and the radio tag recognition device are located within a communication distance, and the operator is determined to be in a dangerous area; And And a height measuring unit measuring a height of a component that performs movement in the same direction and speed as the product carried by the crane among the components of the crane, or a height of the bottom of the product carried by the crane. The control unit crane operation safety management system, characterized in that for controlling the crane is performed so that the operation set to be performed when it is determined that the operator is in the danger zone only when the height measured by the height measuring unit is within the set range. According to claim 2, The wireless tag recognition device A radio tag recognition unit recognizing that the radio tag is located within a communicable distance when receiving a radio wave transmitted from the radio tag; And And when the wireless tag recognition unit recognizes that the wireless tag is located within a communication range, the communication unit transmits information to the controller that the wireless tag recognition unit and the wireless tag are located within a communication range. Crane Work Safety Management System 3. The crane work safety management system according to claim 2, wherein the work set to be performed when it is determined that the worker is in a danger area stops the movement of the crane. According to claim 2, wherein the height measuring unit Crane operation safety management system, characterized in that for measuring the height of the lower end of the conveyed product by a two-dimensional laser scanning method delete Among the components of the crane, a component that performs movement in the same direction and speed as the product carried by the crane, and the same as the product carried by the crane among the components of the crane from the radio tag recognition device provided on one side of the worker Receiving information indicating that a component performing movement in a direction and a speed and a radio tag provided on the other side of the worker are located within a communication range; Measuring the height of the bottom of the product carried by the crane or the height of the component carried out in the same direction and speed as the product carried by the crane among the components of the crane; And And receiving the information, controlling the crane to perform a work set to be performed when it is determined that the worker is in a dangerous area. The controlling of the crane may include controlling the crane so that a work set to be performed is performed only when the operator is determined to be in a danger area only when the measured height is within the set range. How to manage crane work safety. The method of claim 7, wherein the operation set to be performed when the operator is determined to be in a danger area stops the movement of the crane. The method of claim 7, wherein measuring the height A method for safety management of crane operation, characterized in that for measuring the height of the lower end of the conveyed product by a two-dimensional laser scanning method. A computer-readable recording medium having recorded thereon a program for realizing the method according to any one of claims 7 to 9.

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