CN201736078U - Strip steel edge searching device - Google Patents

Abstract

The utility model relates to an edge-finding device for strip steel. Photoelectric sensors arranged on both sides of the strip steel are connected to a PLC through a digital quantity input module. The input module collects and converts the signal fed back by the photoelectric sensor, and the PLC program logic accurately judges and locates the position of the edge of the strip according to the different states of the strip blocking the light source, and realizes the edge finding function. At the same time, the PLC adjusts the opening of the solenoid valve on the compressed air pipeline through the pneumatic beam control module, controls the movement of the pneumatic beam, and adapts to the detection of strip steel of various widths and specifications. The utility model has the advantages of simple structure, low investment, quick effect and convenient maintenance, and is suitable for positioning control of various mechanical actuators.

Description

A strip steel edge finding device

technical field

The utility model belongs to an electric control detection device, in particular to a strip edge position detection device which does not require high control precision in a cold-rolled strip steel continuous annealing production line.

Background technique

At present, the continuous annealing production lines of cold-rolled strip steel at home and abroad have a lot of equipment that need to accurately detect and determine the position of the edge of the strip (so-called edge finding), such as equipment such as purge beams, leveling liquid injection beams, and edge shears. These devices do not have high requirements on the control accuracy of the edge of the strip, but they need to accurately locate the edge of the strip in order to reliably and accurately perform the specified mechanical actions and realize the predetermined function. The currently widely used edge detection devices are encoders or photoelectric detection switches, although they can also meet the needs of strip edge detection, but these edge detection devices have high one-time investment and maintenance costs, complex structures, and are not easy to use. Ease of maintenance and repairs and other defects. Especially for the photoelectric detection switch, after two kinds of steel strips with different widths are welded together, due to the different widths, the position of the photoelectric detection switch must be frequently adjusted during detection to successfully detect, which is time-consuming and laborious, and directly affects the continuous annealing production. go straight.

Contents of the invention

The purpose of the utility model is to provide an edge finding device which is simple, easy to maintain, and can accurately locate the position of the edge of the strip.

For this reason, the solution that the utility model takes is:

An edge-finding device for strip steel, which is composed of a pneumatic beam, a photoelectric sensor and a digital input module; the photoelectric sensors located on both sides of the strip steel are respectively installed on the fixed bracket through the connecting plate, and the "T"-shaped head at the upper end of the fixed bracket is slidably connected In the slideway of the pneumatic beam, the photoelectric sensor is connected to the original programmable logic controller (PLC) in the annealing furnace area through the digital input module, and the output module of the PLC is connected to the solenoid valve on the compressed air pipeline that drives the pneumatic beam.

The photoelectric sensor includes a through-beam photoelectric sensor, a reflective plate photoelectric sensor and a diffuse reflection photoelectric sensor; the photoelectric sensors on both sides of the strip are arranged singly or in pairs above and below the strip.

The utility model uses the digital quantity input module to collect and convert the signal fed back by the photoelectric sensor, and the PLC program logic judges the edge position of the strip steel according to the different states of the strip steel blocking the emission light source, accurately locates the edge position of the strip steel, and realizes the edge-seeking function . At the same time, the PLC also adjusts the opening of the solenoid valve on the compressed air pipeline through the output module, and controls the movement of the pneumatic beam, so as to adapt to the strip edge detection of various width specifications. The utility model has the advantages of simple structure, low investment, quick effect, low maintenance cost and convenient maintenance, and can be applied to the positioning control of mechanical actuators.

Description of drawings

Figure 1 is a structural block diagram of the strip edge finding device.

Figure 2 is a diagram of the installation state of the photoelectric sensor.

In the figure: pneumatic beam 1, fixed bracket 2, connecting plate 3, strip steel 4, photoelectric sensor 5.

Detailed ways

As can be seen from Figure 1, the utility model is mainly composed of a pneumatic beam 1, a photoelectric sensor 5, a digital input module and a PLC. The photoelectric sensor 5 located under the pneumatic beam 1 is connected to the PLC through a digital input module, and the PLC is connected to the solenoid valve on the compressed air pipeline driving the pneumatic beam 1 at the same time, and the movement of the pneumatic beam 1 is controlled through the output module of the PLC.

Figure 2 shows that the photoelectric sensor 5 is fixed on the connection plate 3, and the connection plate 3 is installed on the fixed bracket 2. The upper end of the fixed bracket 2 has a "T"-shaped head, and the "T"-shaped head is movably installed on the lower part of the pneumatic beam 1 It can slide along the slideway provided by the supporting set.

The photoelectric sensor 5 is divided into three types: the through-beam photoelectric sensor, the reflective plate photoelectric sensor and the diffuse reflection photoelectric sensor. Therefore, the photoelectric sensors 5 arranged on both sides of the strip steel 4 also adopt two corresponding setting methods according to different shapes. , That is to say, it is set up on the top or bottom of the strip or in pairs above and below the strip. Take the form shown in Figure 2 for the through-beam photoelectric sensor, set a pair of photoelectric sensors 5 on both sides of the strip steel 4, above and below the strip steel 4; A reflective plate type photoelectric sensor or a diffuse reflection type photoelectric sensor is separately arranged only on both sides of the steel strip 4 , above or below the strip steel 4 .

Claims (3)

1. A strip edge detection device, comprising a programmable logic controller (PLC), is characterized in that it is made up of a pneumatic beam, a photoelectric sensor and a digital input module; Installed on the fixed bracket, the "T" head on the upper end of the fixed bracket is slidingly connected in the slideway of the pneumatic beam, the photoelectric sensor is connected to the PLC through the digital input module, and the output module of the PLC is connected to the solenoid valve on the compressed air pipeline driving the pneumatic beam connect. 2. The strip edge detection device according to claim 1, characterized in that the photoelectric sensors on both sides of the strip are installed individually or in pairs above and below the strip. 3. The strip steel edge finding device according to claim 1, wherein the photoelectric sensor includes a through-beam photoelectric sensor, a reflective plate photoelectric sensor and a diffuse reflection photoelectric sensor.