JP3914296B2 - Long metal material detection device in skid-type feeding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for detecting the presence or absence of a material on a skid rail in a skid-type feeding equipment that sequentially cuts a long metal material such as a steel bar for the next process.
[0002]
[Prior art]
In a production line or finishing line for long metal materials such as steel bars, a large number of these materials are put together on a skid rail and aligned, then one by one or several at a time and cut sequentially for the next process. A skid-type feeding equipment is used. Alignment after loading is performed by tilting the skid rail.
[0003]
A conventional skid type material supply facility will be described with reference to FIG. As an example of the long metal material, the round steel bar 1 is loaded together like a 1a between the stoppers 10a and 10b on the skid rail 2 supported almost horizontally by an overhead crane (not shown). Then, the stopper 10b is tilted, the skid rail 2 is inclined by the air cylinder 3 as indicated by a broken line, and the round bar steel 1 is aligned as indicated by 1b by adjusting the inclination angle. The inclined state is as shown in FIG.
[0004]
Next, as shown in FIG. 3 and FIG. 4, in this example, the round bar 1 is placed on the roller table 12 one by one by the cutting device 11, and cut out toward, for example, the finishing equipment in the next process. After all the round bar 1 on the skid rail 2 is cut out, the skid rail 2 is returned to the horizontal position as shown by the solid line in FIG. 3 by the air cylinder 3, the stopper 10b is erected, the next round bar 1 is loaded, and so on. Cut out.
[0005]
In order to perform the above series of operations by automatic operation, it is indispensable to reliably detect the presence or absence of the round bar 1 on the skid rail 2. If the round bar 1 of the next lot is loaded on the skid rail 2, not only the management of each lot will become impossible, but also different materials will be mixed when the steel type is changed. And serious troubles occur after product shipment.
[0006]
Conventionally, as a method for detecting the presence / absence of material on the skid rail 2, means such as FIG. 5, FIG. 6, and FIG. 7 are known. In the means of FIG. 5, a plurality of boat-type strikers 13 are arranged in the length direction of the skid rail 2, that is, the material transfer direction, and the lever of the striker 13 pushed down by the weight of the material such as the round steel bar 1 is The presence or absence of material is detected by pressing the limit switch 14. The deformation of the striker 13 can also be detected by a proximity switch.
[0007]
In the means of FIG. 6, the light projecting unit 15 and the light receiving unit 16 of the photoelectric switch are provided, and the presence or absence of the material is detected by detecting that the material such as the round steel bar 1 blocks the optical axis. In the means of FIG. 7, the proximity switch 17 is disposed without a gap in the length direction of the skid rail 2, and the material such as the round steel bar 1 is directly detected. The proximity switches 17 are arranged in a staggered manner to avoid mutual interference. In addition, a method of installing a camera to capture an image and determining the presence / absence of material by signal processing is also conceivable.
[0008]
[Problems to be solved by the invention]
Each of the above conventional means has the following problems. In the means of FIG. 5, troubles of the mechanical mechanism such as wear of the bearing portion of the striker 13 are likely to occur, and in addition, in the case of a small amount of light material, the pressing force is insufficient, and the material may not be detected. Furthermore, it is necessary to fix the detector such as the limit switch 14 and its wiring to the skid rail 2 that can change the inclination, and there are problems such as securing space, damage to the detector, wear of the wiring, and disconnection.
[0009]
In the means of FIG. 6, since the optical axis connecting the light projecting unit 15 and the light receiving unit 16 intersects the traveling direction of the material such as the round steel bar 1, it is necessary to arrange to avoid interference. There is a problem that a dead zone D in which the material does not block the optical axis is generated. Further, the means of FIG. 7 has a problem in terms of cost because the number of proximity switches 17 increases.
[0010]
Further, in the means shown in FIGS. 6 and 7, since the equipment is attached to the skid rail 2 that is variable in inclination, there are problems such as securing of space, equipment damage, wiring wear and disconnection, and the like. Also, the image processing method using a camera is expensive.
In the conventional skid-type material supply equipment, it is impossible to perform a fully automatic operation due to such a problem, and it is necessary to monitor the operator.
[0011]
The present invention is a device for reliably detecting the presence or absence of a material on a skid rail in a skid-type feeding equipment that cuts out a long metal material such as a round steel bar for each subsequent process. An object of the present invention is to provide an inexpensive, easy-to-maintain device that can be fully automated without causing damage, wiring wear or disconnection.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a skid-type feeding equipment that sequentially cuts out a long metal material loaded on a plurality of skid rails for the next process, and is selected from the plurality of skid rails. The skid rail is electrically insulated from the frame of the feed equipment, and includes an electrical value measuring device based on an electrical resistance change between the frame and the selected skid rail. It is a long metal material detection device in a skid type material supply equipment.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The apparatus of the present invention will be described with reference to the examples shown in FIGS. FIG. 1 is a partial perspective view in which the present invention is applied to a conventional skid-type feeding equipment as shown in FIG. As an example of the long metal material, the round bar 1 is aligned on a plurality (four in the figure) of skid rails 2 inclined by the air cylinder 3. The round steel bars 1 are stacked together between the stoppers 10 a and 10 b as shown in FIG. 3, and are aligned by tilting the skid rail 2 by the air cylinder 3 while tilting the stopper 10 b.
[0014]
Then, by gradually increasing the inclination angle of the skid rail 2, the round bar 1 is transferred to the downstream side as indicated by the arrow, and placed on the roller table 12 by the cutting device 11 as shown in FIGS. Then cut out for the next process. In addition to being placed one by one on the roller table 12, a predetermined number of pieces can be placed together according to the size and cut out.
[0015]
According to the present invention apparatus, in such a skid type feed equipment, a skid rail selected from a plurality of skid rails is electrically insulated from a base of the feed equipment, and the base and the selected skid rail An electrical value measuring device based on a change in electrical resistance between the two is provided. The measuring device may measure any of electric resistance, current, and voltage as an electrical value.
[0016]
In the example of FIG. 1, a skid rail 2b selected from a plurality of skid rails 2a, 2b, 2c, and 2d sandwiches an insulating plate 5 in a sandwich manner, so that the upper surface and the lower surface are electrically insulated. ing. The upper surface of the skid rail 2b is connected to the power source 6, and the power source 6 is grounded. The other skid rails 2a, 2c and 2d are grounded via the support base 4. Grounding is performed by connecting to the base 9 of the feed equipment as shown in FIG. 3 and FIG.
[0017]
When the round bar 1 is present on the skid rail 2 as in the example of FIG. 1, the skid rail 2 b insulated from the gantry 9 and the non-insulated skid rails 2 a, 2 c, 2 d are short-circuited by the round bar 1. It becomes. As shown in FIG. 2, a closed circuit is formed from the power source 6 through the skid rail 2b, the round steel bar 1, the other skid rails 2a, 2c, and 2d, through the gantry 9, and back to the power source 6. By connecting, for example, an ammeter 8 as a measuring device to this circuit, a change in electrical resistance between the gantry 9 and the skid rail 2b can be measured. Reference numeral 7 denotes an adjustment resistor for adjusting the electric resistance of the closed circuit to an appropriate value.
[0018]
In this closed circuit, a current determined by the resistance, contact resistance, and adjustment resistance 7 of the round steel bar 1 and the skid rail 2 flows, and the electric resistance of the closed circuit can be measured from the indicated value of the ammeter 8. That is, when the round bar 1 is not present on the skid rail 2, the electric resistance is almost infinite and almost no current flows. However, when the round bar 1 is present, the electric current is closed as described above. Since resistance becomes small, the presence or absence of the round bar 1 can be determined by detecting whether or not the current value of the closed circuit exceeds a predetermined threshold value.
[0019]
Then, as shown in FIG. 2, the ammeter 8 is provided with a contact, and the control circuit 19 is operated by the contact 18 that is turned ON or OFF when the threshold value is exceeded. You can drive.
As a measuring instrument in the device of the present invention, in addition to the ammeter 8 as in the example of FIG. 2, it is also possible to measure the electrical resistance or measure the voltage change based on the electrical resistance change.
[0020]
In the skid-type material supply equipment according to the present invention, the skid rail that is insulated from the gantry is a rail that the material such as the round steel bar 1 always comes into contact with. If the length of the material varies and the short material does not contact the rail, a plurality of skid rails may be insulated.
[0021]
In addition to tilting the skid rail 2 and aligning and supplying materials such as the round bar steel 1 as described above, the target long metal material is difficult to roll, such as square bars. However, if the skid rail 2 is difficult, the skid rail 2 may be tilted or not tilted, and a jig may be used to feed the material one by one or a plurality.
[0022]
【Example】
The apparatus of the present invention as shown in FIG. 1 and FIG. 2 was installed in a skid type feed equipment as shown in FIG. The diameter of the round bar 1 is 50 mm. As shown in FIG. 1, MC nylon having a thickness of 10 mm was sandwiched between the skid rail 2b as the insulating plate 5, and the rail 2b and the gantry 9 were electrically insulated. Then, as shown in FIG. 2, one end of the constant voltage circuit was grounded to the skid rail 2b and the other end was grounded to the mount 9, a DC constant voltage of 12V was applied, and the adjustment resistor 7 and the ammeter 8 with a contact were connected.
[0023]
When there was no round bar 1 on the skid rail 2, the current flowing through the ammeter 8 was 0 mA. When the round bar 1 was loaded on the skid rail 2, the current exceeded 10 mA. Then, the control circuit 19 as shown in FIG. 2 set the current value of 10 mA as a threshold value and returned the skid rail 2 to the horizontal position, and loaded the next material. In this way, it was possible to reliably perform unattended automatic feeding by determining the presence or absence of the round bar steel on the skid rail 2.
[0024]
When the size of the round steel bar 1 is changed or when a material other than the round steel bar is supplied, the contact resistance between the material and the skid rail changes depending on the shape, size, and weight. By appropriately adjusting the resistance of the circuit, it was possible to reliably perform automatic feeding as in the case of the round steel bar 1.
[0025]
【The invention's effect】
According to the present invention, it is possible to reliably detect the presence or absence of a material on a skid rail in a skid-type feeding equipment for cutting out a long metal material such as a round bar steel in a fixed amount for the next process. Moreover, even if the skid rail is inclined, there is no risk of damage to the detector, wear of the wiring, or disconnection, and it is inexpensive and easy to maintain. Therefore, it is possible to construct a highly reliable fully automated system at low cost.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a main part of a device of the present invention.
FIG. 2 is an explanatory diagram illustrating a circuit of a measuring device in the device of the present invention.
FIG. 3 is a side view showing an operation example of a conventional skid type material supply facility.
FIG. 4 is a perspective view showing a main part of a conventional skid type material supply equipment.
FIG. 5 is a side view showing a material detecting means in a conventional skid type material supply equipment.
FIG. 6 is a side view showing another means for detecting a material in a conventional skid-type feeding equipment.
FIG. 7 is a perspective view showing another means for detecting a material in a conventional skid type material supply facility.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Round bar 2 ... Skid rail 3 ... Air cylinder 4 ... Support stand 5 ... Insulation board 6 ... Power supply 7 ... Adjustment resistance 8 ... Ammeter 9 ... Base 10 ... Stopper 11 ... Cutting device 12 ... Roller table 13 ... Striker 14 ... limit switch 15 ... light projecting part 16 ... light receiving part 17 ... proximity switch 18 ... contact 19 ... control circuit

Claims (1)

In a skid-type material supply facility for sequentially cutting a long metal material loaded on a plurality of skid rails for the next process, the skid rail selected from the plurality of skid rails is a frame of the material supply facility. An electrical value measuring device based on a change in electrical resistance between the gantry and the selected skid rail. Detection device.

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