JP3456875B2 - Overlap detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate,
Plates are conveyed on the transfer line with multiple
And a device for detecting that [0002] 2. Description of the Related Art A plate-like object such as a metal plate is transported on a transport line.
When transporting, two or more boards are conveyed in an overlapping state
When this plate is supplied to the subsequent process,
May hinder the business. For example, at a steel mill
The steel sheet piled up on the pile of steel sheets
When moving to the transfer table by suction with a crane,
It is sucked in a state where two plates are stacked and transported as it is
And may be transported in that state. [0003] The steel sheet in such a state is subjected to the next step, for example, cold straightening.
When lowering with a regular machine, straightening low
May be damaged. The means to solve such problems
One example is disclosed in JP-A-54-33468.
In other words, the disclosed technology applies a pair of excitations to the transport path of the metal plate.
Two sensors consisting of a magnetic coil and a detection coil are arranged side by side
And a processing unit with a phase detection circuit
The detection signal appears on the detection coil by exciting
First, the phase detection circuit detects the phase using this detection signal.
The two metal plates are detected by the phase detection.
Things. This technique allows the edge of the metal plate to enter the magnetic field
Use a magnetically balanced type whose output varies with
Changes in the distance between the sensor and the metal plate or
Be affected by external factors such as the material of the metal plate to be
And less. However, such techniques
Since it is necessary to make a metal plate exist in the magnetic field, the sensor
Must be placed close to the metal plate,
Therefore, if the shape of the metal plate is
If the sensor is damaged or broken due to contact with the metal plate
There is a case. [0004] In view of the above, the sensor is moved from a metal plate.
If installed at a distance, the detection accuracy will deteriorate and a good detection function will be required.
It becomes difficult to have. [0005] SUMMARY OF THE INVENTION The objects of the present invention overlap.
When detecting a board, the detection accuracy of the sensor is reduced.
The sensor can be installed without touching the detection plate without using
A detection device is provided. What are the other objects of the present invention?
Even when the plate is being transported, the tip of the plate is surely
To provide a detection device capable of detecting the [0006] Means for Solving the Problems To solve the above-mentioned problems,
For example, the present invention relates to an ultrasonic sensor for detecting a thickness and a photoelectric material load.
It uses a sensor and its detection device has the following configuration.
It becomes. In other words, in the vicinity of the delivery position of the plate
At the top of the transport table,
Placed on top of the transport table near this material sensor.
And multiple ultrasonic sensors at a pair of lower positions
And input the plate-like object detection signal by the material sensor to the computer
The signal of the ultrasonic sensor is started by this signal.
Starts, the displacement of this count value and the preset
Compared with the set value, this displacement became more than the set value
It is composed of an alarm panel that outputs an alarm when it occurs. [0007] With such an apparatus, a plurality of plate-like objects can be reliably formed.
And the distance from the plate to the sensor
Can be separated by 60-1300mm or more to deform plate-like objects
It is possible to almost eliminate the troubles caused by this. Also,
Work side material load sensor or drive side as material load sensor
V-shape with material load sensor at the center member load sensor
, So that it does not matter
The tip can be detected without fail. [0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of the apparatus of the present invention will be described in detail below.
This will be described in detail. Fig. 1 shows a plan view of a thick plate 2
Lifted from the section M by the magnet crane C, and transport roll
R on the plate transport table T to be sent to the straightening machine L
1 shows an example in which a detection device 1 of the present invention is provided. The detection unit 4 of the detection device 1 shown in FIG.
As shown in FIG.
With reference to the pass line P of the transport band T,
The same distance to the working side WS at the opposing upper and lower positions
X_W, Y_WSeparate upper ultrasonic sensor 5W₁And lower super
Sound wave sensor 5W_TwoHowever, the same distance X
_D, Y_DRelease upper ultrasonic sensor 5D₁And lower super
Sound wave sensor 5D_TwoIs arranged. The photoelectric type material load sensor 6 is shown in FIG.
The center member load sensor 6
C also makes this central member load sensor 6C a point,
V at which the point is located forward with respect to the conveying direction of the plate thickness.
The work side material loading center is located on both sides of the
A circuit 6W and a driving-side material load sensor 6D are arranged. What
Contact, 5W ultrasonic sensor for thickness detection₁, 5W_TwoFigure 3
Between the material sensors 6C and 6W as shown in
Wave sensor 5D₁, 5D_TwoAre the material sensors 6C and 6D
Between each other and in the thickness direction
It is arranged vertically. Next, the specific structure of the control unit 7 of the detection device 1 will be described.
The configuration will be described with reference to FIG.
5W₁, 5W_TwoAnd ultrasonic sensor amplifier 8W₁,
8W _TwoComputer 11W connected through the
Sensor 5D₁, 5D_TwoAnd ultrasonic sensor amplifier 8
D₁, 8D_TwoAnd a computing unit 11D connected through
ing. Further, these computing units 11W and 11D are used for material loading.
Sensor amplifiers 9C, 9D, 9W and relays 10C, 10
D, 10W and material sensors 6C, 6D, 6W
Connected to each other, and furthermore, alarm relays 12W, 12D
Is connected to the alarm panel 13 via the. The above equipment
As shown in FIG. 1, this plate is placed under a thick plate 2 (large plate).
Thick plate 3 (small plate) smaller than thick plate
Is transferred to the transfer table in the
It is assumed that the first material load sensors 6W and 6D detect the load. The computing units 11W and 11D have respective super
From the acoustic wave sensor, for example, the distance X_W, Y_WAnd X
_D, Y_DTo 200 mm, respectively, to 60-200 mm
The corresponding analog signal is in the range of 4-20 mA, ie
Each ultrasonic sensor 5W₁~ 5W_TwoAnd 5D₁~ 5D_Twowhile
Input in the range of 60 to 200 mm and 4 to 20 mA (X '
_W, Y '_WAnd X '_D, Y '_D) Is the material
Reference value reading finger by detection of load sensors 6W and 6D
And the thick plates 2 and 3 move and the tip ends
When it is detected by the sensor 6C, a thickness measurement start command is issued.
The ultrasonic sensors are immediately sent to the calculators 11W and 11D.
Sir counting begins. As a result, as shown in FIG.
Sir 5W₁And the count value X '_W(Distance to thick plate)
Unmounted, ultrasonic sensor 5W_TwoAnd the count value Y '_W
Is counted, and the count value X '_W+ Y '_WIs calculated
(400− (X ′)_W+ Y '_W))
And plate thickness T_WIs calculated, and this value is used as a reference value and the initial value
It is memorized. Similarly, in the calculator 11D, the ultrasonic
Sensor 5D₁, 5D_TwoCount value X '
_D, Y '_DThe operation (400- (X '_D+ Y '_D))
The thickness T_DIs calculated, and this value is used as a reference value and the initial value
It is memorized. In this state, the plate thickness further moves and the plate
The rear end of the thick plate 3 is an ultrasonic sensor 5W₁, 5W_TwoThe position
When it comes off, the ultrasonic sensor 5W_TwoChange in the count value of
Position, and the thickness T of the large thick plate 2 is detected by these sensors._DTo
Will be detected. This displacement is a predetermined value, for example,
Calculate when the minimum value of the thick plate is 4.5mm or more (abnormal value)
Alarm panel 13 from the machine 11W via the alarm relay 12W
Is output to [0016] This alarm causes the worker to
Stop the operation, remove the small plate 3 and remove only the large plate 2
It can be sent to the straightening roller safely. like this
In the above example, the thickness is reduced to a specified value or more from the reading reference value.
The case where the alarm is output to the alarm panel when it is short has been described.
Akira indicates that the sheet thickness has increased by more than a predetermined value from the reading reference value.
In other words, the small plank overlaps the latter half of the large plank.
It is configured to be able to output to the alarm panel even when it occurs. The material sensor is a work-side material sensor.
6W or drive side material load sensor 6D is the central member load sensor
-6C so that it is located in a V-shaped position
The slab is transported in a skewed state
Also, the center member load sensor 6C and both side member load sensors 6W
Alternatively, the tip of the thick plate can be reliably detected with 6D or 6D. The present invention has been described with reference to a thick plate as an example.
However, metal plates other than steel plates, non-metal plates or cardboard
The present invention can be applied to any cases. [0019] As described in detail above, the present invention provides a
Since an ultrasonic sensor is used as a detection sensor,
Depending on the deformation of the plate-like object assumed in advance, the sensor
Output can be selected, thus changing the plate
Since it is possible to prevent the detection device from being damaged by the shape,
It is possible to detect the overlapping plate very safely and reliably.
Wear.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a state in which a detection device of the present invention is arranged on a straightening machine line. FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a plan view showing a relationship between a thick plate on a transport roll and a detection device of the present invention. FIG. 4 is a block diagram of the detection device of the present invention. [Description of Signs] 1 ... Overlapping plate detection device 2 ... Large plate 3 ... Small plate 4 ... Detector 5 ... Ultrasonic sensor 6 for measuring plate thickness 6 ... Load sensor 7 ... Controller 8 ... Ultrasonic sensor Amplifier 9 Material sensor 10 Relay 11 Computer 12 Alarm relay 13 Alarm panel

Continuation of the front page (56) References JP-A-6-191680 (JP, A) JP-A-56-166408 (JP, A) JP-A-7-215537 (JP, A) JP-A-60-129607 (JP, A) , U) Japanese Utility Model Hei 5-346 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01B 17/00-21/32 B65H ^7/ 00-7/20

Claims (1)

(57) [Claims 1] One plate at the center of the plate-like object transfer table,
A plurality of material sensors disposed one at a time at both ends of the V-shaped transfer table having the central portion as a point, and detecting a plate-shaped material disposed on the plate-shaped material transfer table; A plurality of upper sheet thickness detecting ultrasonic sensors and one upper sheet thickness detecting sensor disposed in proximity to the material sensor and disposed between the material sensors at the center and both ends of the plate-like object transfer table, respectively; A plurality of lower sheet thickness detecting ultrasonic sensors respectively disposed between the material sensors at the lower center and both ends of the plate-like object transfer table in correspondence with the ultrasonic sensors for sheet; A material load detection signal of a load sensor and a thickness detection signal from the upper and lower sheet thickness detection ultrasonic sensors are input, and the upper and lower sheet thickness detection ultrasonic sensors are input by a command of the material load detection signal. Distance and count of the thickness detection signal An arithmetic unit that reads a thickness reference value determined from a difference between the count value of each of the upper and lower thickness detection ultrasonic sensors at the start, and a thickness determined by the thickness detection signal and An overlap plate detection device comprising an alarm panel that compares a plate thickness reference value and outputs an alarm when the displacement exceeds a set value.