JP2002002613A - Operating method of packing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operating method of a packing apparatus capable of efficiently packing a packaging film around a work such as a coiled steel strip. SOLUTION: In this operating method of the packing apparatus in which not only an outer surface of the work but also a cylindrical hole surface thereof is packed by the packaging film by the traveling of a shuttle so that the shuttle 2 having a packaging film feeding means passes through the cylindrical hole in the cylindrical work supported by a cradle roll 3 while the shuttle is circulated on an endless track, the traveling speed of the shuttle 2 is controlled to be low when the shuttle passes through the cylindrical hole in the work while it is controlled to be high when the shuttle travels on the outer periphery of the work, allowing the circulation of the shuttle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a packing apparatus for efficiently packing a traction-extensible synthetic resin packaging film on an object to be packaged such as a coil wound steel plate.

[0002]

2. Description of the Related Art Conventionally, an article such as a coil wound with a steel sheet is packed with a wrapping stretchable synthetic resin packaging film on its outer surface for the purpose of protecting it from water and dust when storing and transporting it. This is commonly done. In particular, a large cylindrical article such as a steel sheet wound coil has a cylindrical hole in the center and is heavy, and for example, is disclosed in
As shown in Japanese Patent No. 294314, while a shuttle provided with a supply means for a stretch packaging film orbits on an endless track, the shuttle penetrates a cylindrical hole of a cylindrical object to be packaged which is supported by a cradle roll. A packing device is used in which the shuttle runs to pack not only the outer surface of the article to be packaged but also the cylindrical hole surface with a packaging film.

[0003] In such a packaging apparatus, the shuttle for pulling the packaging film has a structure of orbiting at a constant speed on the loop body. For this reason, a method of simply increasing the shuttle speed has been adopted in order to increase the efficiency of the packing work.However, if the shuttle speed is increased, the unwinding speed of the packaging film becomes large, and the film tension becomes excessive and the film tension becomes excessive. There is a problem that there is a phenomenon of cutting and there is a limit to increasing the shuttle speed,
To prevent film breakage, the shuttle speed should be reduced, but in this case there is a problem that packing efficiency is reduced, and at the same time the conflicting technical issues of improving work efficiency and preventing film breakage are satisfied. It has been desired to develop a new operation method for a packaging device that can be used.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and enables a packaging film such as a coil wound with a steel sheet to be cut without causing film breakage. The present invention has been completed for the purpose of providing an operation method of a packing device that can efficiently pack not only the outer surface of a packaged object but also a cylindrical hole surface with a packaging film in a short time.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a method of operating a packing apparatus according to the present invention is characterized in that a shuttle provided with a means for supplying a packaging film travels around an endless track while traveling in a cradle. Packing in which the outer periphery of the packaged object as well as the cylindrical hole surface is packed with a packaging film by running the shuttle so that the cylindrical hole of the packaged product supported by the roll passes through the cylindrical hole. In the operating method of the device, the shuttle speed is controlled such that the traveling speed of the shuttle is a low-speed operation when penetrating the cylindrical hole of the packaged object, and a high-speed operation when traveling around the outer periphery of the packaged object. It is characterized by running.

A method of operating a packing device in which the low-speed operation speed of the shuttle is reduced to 70% or less of the high-speed operation speed according to the second aspect of the present invention is to detect the position of the shuttle on a track. 4. A method for operating a packing apparatus, comprising: installing a sensor to perform a shuttle operation; and controlling a traveling speed of the shuttle by timer control based on an output signal of the sensor.
The invention according to claim 4 further relates to a method of operating a packing apparatus in which the rotation speed of a cradle roll that supports an object to be packaged is controlled in conjunction with the rotation speed of the shuttle.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. The drawing shows a case where a steel sheet wound coil, which is a cylindrical object W to be packaged, is packed with a packaging film F. In the drawing, 1 is a loop body forming an endless track, and 2 is a loop running on the endless track. Shuttle, 3
Is a cradle roll that supports the packaged object W, and the shuttle 2 is configured to penetrate through a cylindrical hole of the packaged object W supported by the cradle roll 3 while traveling around an endless track. The operation of the shuttle 2 for packing the object W to be packaged not only on the outer surface but also on the cylindrical hole surface with the packaging film F is described in Japanese Patent Application Laid-Open No. HEI 5-294314. The same is true.

According to the present invention, the traveling speed of the shuttle 2 is set to a low speed operation when passing through the cylindrical hole of the packaged object W, and a high speed operation when traveling around the periphery of the packaged object W. In this way, it is possible to prevent the packaging film F from being cut on the entrance side and the exit side of the cylindrical hole surface of the article to be packaged W, and to control the high speed. This allows efficient packing without running out of film even when operated with a.

This is because, when the inventor runs the shuttle 2 at a constant speed and packs the packaging film F in the packaged object W, the packaging is particularly performed on the entrance side and the exit side of the cylindrical hole surface of the packaged object W. This is based on the finding that the phenomenon that the film F is cut occurs. That is, as shown in FIG.
(The size of the packaging film F before shrinkage is 20)
0 mm, and the smaller the numerical value is, the larger the shrinkage ratio (corresponding to the tensile force) is). This tendency becomes more remarkable when the traveling speed is increased. Therefore, if the speed of the shuttle 2 is controlled so as to be low when the shuttle 2 penetrates the cylindrical hole of the article W to be packaged, it is possible to prevent the packaging film F from being cut even when the whole is operated at high speed.

The high and low running speeds of the shuttle 2 referred to in the present invention mean a relative relationship between the two, and are determined in consideration of the material, thickness, width, etc. of the packaging film F. It is preferable to control at least the low-speed operation of the shuttle 2 at a speed reduced to 70% or less of the high-speed operation. In particular, when the high-speed operation of 200 m / min or more is performed, the low-speed operation is reduced to 50% or less. It is preferable to control the deceleration to the speed. Conventionally, when the shuttle 2 was traveling at a constant speed, the traveling speed was set to about 100 m / min so as not to cause film breakage. However, in the present invention, the traveling speed of the shuttle 2 in a high speed region is set to 250 m / min.
It can be set to min or more.

As shown in FIG. 2, the shuttle 2 has a supply means 21 for a packaging film F. The pre-tensioning rollers 22a and 22b and a group of tension-holding guide rollers 23 are used to feed the film with a constant tension. It is configured to supply. In the figure, reference numerals 24 and 25 denote wheels. The loop body 1 is sandwiched between the wheels, and is configured to run on a track by operation of a motor (not shown). As an example of the speed control method, in the illustrated example, a sensor S for detecting the position of the shuttle 2 is installed on the track, and the traveling speed of the shuttle 2 is controlled by timer control based on an output signal of the sensor S. It is like that. That is, in response to the output signal of the sensor S, the motor is rotated at high speed for a certain period of time to perform high-speed operation of the shuttle 2, and then the timer is controlled to perform low-speed operation of the shuttle 2 by rotating the motor at low speed for a certain period of time. By doing so, the packaging can be completed. Note that the speed control method is not limited to this, and, for example, the installation position of the sensor S is arbitrary, and it goes without saying that any control means other than the timer control can be selected.

As shown in FIG. 1, the packaged object W is supported by a pair of cradle rolls 3, and the packing operation is performed while being rotated in the axial direction by the rotation of the cradle rolls 3. Whole packaging film F
In this case, if the rotation speed of the cradle roll 3 is controlled in conjunction with the revolving speed of the shuttle 2, the rotation speed of the cradle roll 3 is controlled in accordance with the rotation speed of the shuttle 2. Cutting of the packaging film F on the delivery side is suppressed, and the overlapping margin of the packaging film F is constant, so that there is no waste and the packaging operation can be performed in a short time, which is preferable.

As described above, in the operation method of the present invention, the traveling speed of the shuttle 2 is set to a low speed when passing through the cylindrical hole of the package W, and is set to a high speed when traveling around the periphery of the package W. It is controlled to be driving and is made to run around,
As a whole, the shuttle 2 can travel around at high speed as compared with the conventional case, and the packing work can be greatly improved without occurrence of film breakage.

[0014]

EXAMPLE Using a device shown in which the circumference of a loop body is 8420 mm, a coil wound with a steel plate having a diameter of 1000 mm was packed as a film wrap of 50 mm with a packaging film F (width 220 mm). In this case, the number of revolutions of the shuttle loop body is 19
Times needed. The speed of the shuttle during high-speed operation is 270m /
min, the speed at the time of low-speed operation is 135 m / min, and the shuttle goes around the loop body with the high-speed operation for 1.1 seconds after passing the sensor, the low-speed operation for 0.4 seconds after that, and the high-speed operation for 0.6 seconds thereafter. Was set and the operation was controlled. As a result, the packing time was 39.9 seconds per piece, and there was no film breakage. On the other hand, if you pack the shuttle at a constant speed of 135m / min,
It took 71.1 seconds for each unit, and it was confirmed that the packing time was greatly reduced. When the shuttle was run at a constant speed of 270 m / min and packed, the film was broken and the packing operation could not be continued.

[0015]

As is apparent from the above description, the present invention can be applied to a case where a packaging film is formed on a large and heavy cylindrical object to be packaged, such as a coil wound with a steel sheet, without causing film breakage. In addition, the packaging can be efficiently performed in a short time. Therefore, the present invention greatly contributes to the development of industry as a method of operating a packaging device that has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a front view schematically showing a shuttle.

3A is a graph showing the amount of shrinkage of a packaging film at each location of an article to be packaged, and FIG. 3B is a diagram showing each measurement point.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loop body 2 Shuttle 3 Cradle roll F Packaging film S Sensor W Packaged object

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Makoto Kusama 5-3 Tokai-cho, Tokai-shi, Aichi F-term in Nagoya Works, Nippon Steel Corporation (Reference) 3E028 AB02 BB05 GA10 HA02 3E037 AA02 BC01

Claims (4)

[Claims] 1. A shuttle provided with a wrapping film supply means, which passes through a cylindrical hole of a cylindrical object to be packaged, which is supported by a cradle roll, while traveling around an endless track. In the operating method of the packing apparatus in which not only the outer surface of the packaged object but also the cylindrical hole surface is packed with the packaging film by traveling, the traveling speed of the shuttle may be such that the shuttle speed passes through the cylindrical hole of the packaged object. Is a low-speed operation, and when traveling around the outer periphery of the packaged object, is controlled so as to be a high-speed operation so that the package runs around the package. 2. The method according to claim 1, wherein the low speed operation speed of the shuttle is 70% or less of the high speed operation speed. 3. The shuttle running speed is controlled by a timer for detecting the position of the shuttle on the track, and a timer control based on an output signal of the sensor is used to control the running speed of the shuttle. A method for operating a packaging device according to any one of the above. 4. The packing apparatus according to claim 1, wherein the rotation speed of the cradle roll supporting the packaged object is controlled in conjunction with the rotation speed of the shuttle. how to drive.