RU192118U1 - Sheet Finder - Google Patents

Abstract

The sheet finder is designed to search for objects in the ultrasonic inspection zone. The device comprises a sheet edge sensor, a linear actuator, an oscillator, a control device, a measuring information processor and a bed. The sheet edge sensor is electrically connected to the measuring information processor. The sensor is kinematically connected to the bed through a power drive. To perform periodic oscillatory motion, the sensor is connected to an oscillator.

The technical result observed during the implementation of the claimed solution is the expansion of the search area of the searcher, which makes it possible to detect sheet hire of various sizes and locations in the working area. 7 c.p. f-ly, 7 ill.

Description

The utility model relates to measuring devices, namely to means for determining the spatial coordinates of the edges of sheet metal. The technical solution is intended primarily for the search for quadrangular sheets of metal in the zone of ultrasonic testing (ultrasound).

Automated production processes for processing sheet metal and controlling its quality require determining the presence, quantity and location of objects of control (OK) in the working area of the production line, which is based on the measured spatial coordinates of the edges of the sheet metal. In particular, when conducting ultrasonic scanning, the coordinates of the rectangular sheet scanning region are determined, within which ultrasonic transducers (ultrasonic converters) are moved. For sheets of regular shape with trimmed edges, the coordinates of the four points of the borders of the scan area correspond to the four corners OK. If the sheet is not edged or curved, then the scanning area is limited by a rectangle inscribed in the overall dimensions of a complex-shaped sheet to exclude the SPD beyond the OK boundaries and prevent false alarms.

From the patent document RU 2298180 C2 of 04/27/2007 a device for ultrasonic testing is known, containing a finder for sheet metal edges. A well-known technical solution includes mechanical position sensors for the longitudinal edges of the controlled sheet with movement mechanisms, blocks of optical sensors for searching for the longitudinal edges of the controlled sheet, equipped with drives with a small stroke relative to the transverse size of the sheet, stationary optical sensors for detecting the sheet, and optical sensors for searching the transverse edges of the sheet. Stationary optical sensors for detecting the sheet detect the appearance of the sheet before installation and include a system of optical sensors for searching the transverse edges of the sheet. The automatic system, having received signals from the sensors, determines the shape of the front transverse edge of the sheet. Then, the blocks of optical sensors are turned on to determine the position of the right and left longitudinal edges of the sheet. Due to the limited travel of the drives of the search sensors for the longitudinal edges of the controlled sheet, the known finder has narrow working areas separated by a blind region, which is why coverage of OK along its entire width is not possible. For this reason, the known device is not able to detect sheet metal having a size significantly different from the set, or which is located arbitrarily.

The technical problem to be solved is the detection in the working area of sheet metal of various sizes and / or locations.

The technical result provided by this utility model is to expand the finder's working area, in which the edges of sheet metal can be detected.

The technical result is achieved due to the fact that the edge finder of sheet metal comprises a sheet edge sensor, a linear power drive, an oscillator, a control device, a measuring information processor and a bed. Moreover, the sheet edge sensor is electrically connected to the measuring information processor and kinematically connected to the bed through a power drive, connected in turn with a control device and with an oscillator to give the sensor periodic oscillatory motion.

In the particular case of the implementation of the utility model, the searcher comprises an additional linear power drive connected to the bed, the sheet edge sensor and the control device. In this case, the power drives are spatially oriented from the condition that the sensor can be moved in mutually perpendicular directions.

In another particular case, the amplitude of oscillations of the sheet edge sensor is selected from the condition that the width of the working zone is exceeded for the placement of sheet metal.

In the particular case, the finder contains sheet edge sensors, and the oscillator is connected to a group power drive to enable synchronous-phase motion of all these sensors.

In a particular case, the searcher is characterized in that the number of sensors is selected from condition (1).

Where:

N is the number of sensors;

W is the width of the working area;

A is the amplitude of the transverse scan;

L is the distance between adjacent sensors.

Also, in the particular case, the finder contains a line of sheet edge sensors, while all the sensors are rigidly interconnected and evenly distributed on one straight line.

In the particular case, the vibration amplitude of each sheet edge sensor is selected from condition (2).

,

,

where A is the amplitude of the transverse scan;

W is the width of the working area;

N is the number of sensors.

In another particular case, the oscillator is made harmonic.

The essence of the device is illustrated by the following drawings and diagrams, which show, by way of example, a preferred embodiment of a sheet finder.

FIG. 1: sheet metal edge finder (front and plan view).

FIG. 2: electro-kinematic diagram of an edge finder.

FIG. 3-4: lateral movement of edge sensors during measurement (front view).

FIG. 5: trajectories of the edge sensors (plan view).

FIG. 6: calculated sheet scanning area at ultrasonic scanning.

FIG. 7: sheet metal of various sizes and locations in the working area.

Shown in FIG. 1 sheet metal edge finder is part of the ultrasonic testing machine for metal products and consists of assembly units, including five sensors 1 sheet edges, a suspension 2, a portal beam 3, a pair of carriages 4, two supports 5 with wheel trolleys 6 equipped with electric motors 7. Also, the finder contains a control unit 8, an oscillator 9 and a computing device 10.

Sensors 1 are used to detect the edges of the sheet. As sensors 1, optical rangefinders or non-contact inductive devices are used, known, in particular, from RU 146270 U1 dated 10.10.2014, or contact mechanical tracking sensors with clamping working elements. All sensors 1 have the same type and characteristics. The suspension 2 is made in the form of a rigid plate, which is the bearing element for the sensors 1. The portal beam 3 and the supports 5 together form a fin frame, the span of which is sufficient to be located under it OK. The bed is made with the possibility of longitudinal movement relative to OK along the rails 11 by means of wheeled trolleys 6 with electric motors 7 as a linear power drive of the sensors 1. The length of the rails 11 is sufficient to move the finder along the entire working area. When moving OK along the live table, the finder bed is stationary relative to the floor of the workshop; trolleys 6 are not required in this case. Alternatively, the bed can be made in the form of a supporting frame or base. The carriages 4 are equipped with rollers and motorized. These carriages are intended for linear power drive of sensors 1 with the aim of their transverse movement relative to OK. Instead of carriages 4, it is possible to use linear bearings or actuators in the design as complete actuators. The control unit 8 is made in the form of an electronic device with logic elements. Oscillator 9 is a separate electronic unit based on a quartz crystal or an electromechanical device, characterized by an adjustable frequency of natural harmonic vibrations. In an alternative embodiment, the oscillator 9 is designed as a functional unit of the control unit 8. The computing device 10 is a computer processor for measuring information.

All of the listed elements of the sheet metal edge finder are mutually connected by assembly operations and are in a functional and constructive unity. The components of the finder are connected to the device bed directly or through supporting elements.

Sensors 1 are installed in one line and are evenly distributed in space on this straight line, perpendicular to the longitudinal axis OK. The sensors 1 are rigidly coupled by means of a suspension plate 2, to the lower side of which they are attached. The specified plate is connected to the carriages 4 through the supporting elements of the suspension 2. The carriages 4 are mounted on the upper surface of the portal beam 3 with the possibility of movement along this beam as along a guide perpendicular to the longitudinal axis OK. Thus, the sensors 1 are kinematically connected with the portal beam 3 through a transverse drive. The beam 3 is connected to the bogies 6 through the supports 5. The control unit 8, the oscillator 9 and the computing device 10 are mechanically connected to the beam 3. The axes of the carriage rollers 4 and the wheels of the bogies 6 lie in parallel planes at a mutual angle of 90 °, which makes it possible to move the sensors 1 in mutually perpendicular directions.

The outputs of the sensors 1 are electrically connected to the information input of the computing device 10 (Fig. 2). The control inputs of the electric motors 7 of the carts 6 are directly connected to the corresponding output of the control unit 8, and the control inputs of the carriage motors 4 are connected to the control unit 8 via an electronic oscillator 9. When the oscillator is in the form of an electromechanical device, there is no electrical connection between the carriages 4 and the control unit 8, since in this case, the carriage 4 drives directly the electromechanical oscillator.

Finder edges of sheet metal works automatically as follows.

Units of sheet metal are laid out in the working area of the technological line. Sheets 12 are placed on top of the auxiliary stand 13, located on a flat floor of the production room (Fig. 3).

After that, the natural frequency of the oscillator 9 is adjusted based on the smallest possible longitudinal size OK.

Then the automation begins to determine the presence, quantity and arrangement of sheets 12.

The control unit 8 supplies power to the electric motors 7 and gives the bogies 6 and the entire device translational movement along OK along the rail track on which the edge finder stands. At the same time, the control unit 8 starts the oscillator 9, under the action of which the carriage 4 with the suspension 2 make reciprocating movements relative to the portal beam 3 across OK (Fig. 3 and 4). As a result of the addition of forces acting simultaneously on the transverse coordinate axis X and the longitudinal axis Y, along which the actuators of the power electric drives are spatially oriented, the sensors 1 perform wave motions in plan with sinusoidal scanning paths A, B, C, D and E relative to the fixed sheet 12 (Fig. 5), covering the control area with uniformity sufficient to determine the presence, quantity and location of OK in the working area of the production line. If necessary, the oscillator 9 allows you to set the scan paths in the form of a saw, meander or other suitable form for control purposes. At the points of passage of the sensors 1 above the borders of the sheet 12, the measuring signal supplied to the input of the computing device 10 changes by a threshold value, which makes it possible to detect the longitudinal and transverse edges of the sheet 12 and to calculate the approximated contour of the sheet 12 using the array of coordinates of these points, for example, connecting the points with straight lines segments. The coordinates of the edges of the sheets 12 determine the presence, quantity and location of all sheets 12 in the working area. In addition, information on the real shape of sheet metal allows you to limit the scanning area of the ultrasonic inspection of unedged or curved sheets 12, for example sickle-shaped, with a regular rectangle 14 (Fig. 6).

Since the sensors 1 are linearly and rigidly connected to the suspension plate 2, the movements of the sensors 1 are synchronously in-phase. When executing the finder with an independent suspension of the sensors 1, the synchronous-in-phase movement of these sensors provides a group power drive of the coordinate device. The oscillation amplitude of each sensor 1 is selected from condition (2), which makes it possible to detect in the working area of sheet metal 15, 16, 17 of different sizes and / or locations along the entire width of the working area (Fig. 7).

To obtain such a wide working area of the finder, in order to ensure detection of sheet metal edges of various sizes and / or locations in it, one sensor 1 with a scanning amplitude A exceeding the value W is sufficient. However, using a single sensor 1 with such a large transverse scanning amplitude is not always possible in real conditions due to a decrease in process productivity. Therefore, in practice, the number of sensors is selected from condition (1).

The oscillation frequency of the sensors 1 is preferably set so that the paths A, B, C, D and E are longitudinally covered with the minimum possible length OK for at least one and a half scanning periods to ensure sufficient control density.

If you need to search for edges of the tape material, the device works in a similar way.

Claims (8)

1. A sheet metal edge finder comprising a sheet edge sensor, a linear actuator, an oscillator, a control device, a measuring information processor and a bed, characterized in that the sheet edge sensor is electrically connected to the measuring information processor and kinematically connected to the bed through a power drive connected with a control device and with an oscillator to give the sensor periodic oscillatory motion. 2. The searcher according to claim 1, characterized in that it contains an additional linear power drive associated with the bed, the sheet edge sensor and the control device, while the power drives are spatially oriented from the condition that the sensor can be moved in mutually perpendicular directions. 3. The searcher according to claim 1, characterized in that the amplitude of the oscillations of the sheet edge sensor is selected from the condition that the width of the working zone is exceeded to accommodate sheet metal. 4. The searcher according to claim 1, characterized in that it contains sheet edge sensors, and the oscillator is connected to a group power drive to enable synchronous-phase motion of all these sensors. 5. The searcher according to claim 4, characterized in that the number of sensors is selected from the condition N> (W-A) / L, where N is the number of sensors; W is the width of the working area; A is the amplitude of the transverse scan; L is the distance between adjacent sensors. 6. The searcher according to claim 1, characterized in that it contains a line of sheet edge sensors, all sensors being rigidly interconnected and evenly distributed on one straight line. 7. The searcher according to claim 4 or 6, characterized in that the oscillation amplitude of each sheet edge sensor is selected from condition A> W / N, where A is the amplitude; W is the width of the working area; N is the number of sensors. 8. The searcher according to 1, characterized in that the oscillator is made harmonic.

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