SU1425009A1 - Apparatus for following the butt joint - Google Patents

Abstract

This invention relates to automatic welding equipment. The goal is to increase the tracking accuracy due to the joint of the sensor of the joint with respect to the welding torch without transport delay. Inductive type sensor coil is made of two main and two additional windings. The main windings cover the welding torch, are included opposite and shifted relative to each other. Additional windings are connected in series with the main ones and connected to the winding of a matching transformer and a resistive circuit. The output of the sensor through the measuring transducer is connected to the drive of the transverse movement of the welding torch. 4 il.

Description

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The invention relates to equipment for the automatic welding of metal products, mainly laser and laser processing, and can be used to control butt joints without first cutting them and have small gaps.

The purpose of the invention is to improve accuracy; tracking at the expense of the central in relation to the welding torch of fastening the drill |

I FIG. 1 shows the proposed device; in fig. 2 - the same, top view; Hi FIG. 3 is a block diagram of the device; in fig. 4 - electrical circuit.

The burner 1 is equipped with a sensor 2, which is fixed on the surface of the nozzle 3 and is oriented relative to the product 4 with a joint 5 having a seam 6 that intersect the sensitivity of the sensor 2 {interlock measuring sensor windings 2). The sensor 2 fixed to the burner 1

sensor sensitivity. Separated by the junction 5, the areas of the plateau, the device 4, are covered by the electromagnetic field of the windings 14-17, in which eddy currents are induced. The interaction of eddy currents with

5 by the windings of the differential transport bridge 8 leads to a change in their parameters (inductance, quality factor), which is manifested in changes in their EMF and phases. With equal areas of dividing areas, the difference in the EMF of the windings is minimal, and the phase of the resulting signal when compared with the reference signal is taken as zero.

In case of violation of the equality of the sections of the sensitivity zone 7 due to care

 the joint 5 from the initial position the following occurs. The windings of the sensor 2, which are part of the differential transformer bridge 8, powered by the generator 9, produce new values

er electrically connected with the first input of a 2Q emf, the resulting emf of which is 30

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Potential-transformer bridge 8, the second input of which is connected to the output of the generator 9, the outputs of both blocks 8 and 9 are connected to the inputs of the measuring converter 10, the output of which is connected to an electric motor 11 and a gear 13 burner position 1.

; The main measuring windings 14 and 15 with the additional windings 16 and 17 form an inductive bridge branch connected to another branch containing a resistive arm 18 and a secondary winding of a transformer 19, the midpoint of the resistive divider 20 is connected to the measuring transducer 10 and by means of a capacitor 21 - with node 22. The second input of the measuring transducer 10 is connected to the primary winding of the matching transformer 19.

The device works as follows.

In the initial state, the source of heat exposure - the laser beam is focused by the burner 1 along the axis of the nozzle 3 and projected onto the surface of the product 4 in the area of the junction 5. At the same time, the sensor 2 attached to the nozzle 3 covers a certain area lying under the nozzle 3 including the edges of the article; 1 and with the butt 5. During the welding process, a part of the butt joint under the sensor 2 forms the seam 6. In the initial state, the focal beam of the beam is directed at the butt 5. The windings of the sensor 5 are rectangular in shape and shifted relative to their larger axis of symmetry, forming a zone. 7, or the overlap area intersected by junction 5 and dividing it into two parts. The dimensions and geometry of the sensitivity zone 7 are selected from structural considerations and depend on the external dimensions of the nozzle 3, the resolution of the junction line along the curvature and does not have its amplitude and phase and is fed to the input of the measuring converter 10, which performs typical operations amplification, limiting and phase matching of the input signal with the reference one, and also provides a phase-to-current (voltage) conversion. The unbalance signal in the form of direct current (voltage) acts on the control unit, the electric actuator 11, the electric motor 12, and through the gearbox 13 moves the burner 1 to a new position, thereby accomplishing the addition behind the joint. In the phase control method, the influence of the distance from the burner 1 to the product 4 is significantly reduced, since the windings of the sensor 2 are interconnected. The differential transformer bridge circuit has an inductive branch with windings 14-17 and a resistive branch 20 fed from the secondary winding of a matching transformer 19. The measuring diagonal of the bridge includes node 21 and the midpoint of the resistive divider 20 includes a capacitor 22, the value of which, together with the parameters of the inductive branch determines the frequency of the oscillator 9. In the resistive arm 18 of the bridge, variable resistors are installed to be unbalanced.

40

50

The main windings 14 and 15 and the additional 16 and 17 are connected in series with each other, the latter being in mutually opposite arms. Additional windings 16 and 17 compensate for the output signal in the presence of protrusions at the butt joint, as well as when the sensor is skewed. This is achieved by the fact that they are structurally laid on the edges of the main windings 14 and 15 and cover a smaller area of one of the sides.

sensor sensitivity. Separated by the junction 5, the areas of the plateau, the adey of the product 4, are covered by the electromagnetic field of the windings 14-17, in which eddy currents are induced. The interaction of eddy currents with

The windings of the differential transport bridge 8 lead to a change in their parameters (inductance, quality factor), which manifests itself in changes in their EMF and phases. With equal areas of dividing areas, the difference in the EMF of the windings is minimal, and the phase of the resulting signal when compared with the reference signal is taken as zero.

In case of violation of the equality of the sections of the sensitivity zone 7 due to care

the joint 5 from the initial position the following occurs. The windings of the sensor 2, which are part of the differential transformer bridge 8, powered by the generator 9, produce new values

EMF, the resultant EMF of which is the EMF, the resultant EMF of which is

It has its own amplitude and phase and enters the input of the measuring transducer 10, which performs typical operations of amplification, limiting and phase comparison of the input signal with the reference one, and also provides a phase-to-current (voltage) conversion. The unbalance signal in the form of direct current (voltage) acts on the control unit, the electric actuator 11, the electric motor 12, and through the gearbox 13 moves the burner 1 to a new position, thereby accomplishing the addition behind the joint. In the phase control method, the influence of the distance from the burner 1 to the product 4 is significantly reduced, since the windings of the sensor 2 are interconnected. The differential transformer bridge circuit has an inductive branch with windings 14-17 and a resistive branch 20 fed from the secondary winding of a matching transformer 19. The measuring diagonal of the bridge includes node 21 and the midpoint of the resistive divider 20 includes a capacitor 22, the value of which, together with the parameters of the inductive branch determines the frequency of the oscillator 9. In the resistive arm 18 of the bridge, variable resistors are installed to be unbalanced.

The main windings 14 and 15 and the additional 16 and 17 are connected in series with each other, the latter being in mutually opposite arms. Additional windings 16 and 17 compensate for the output signal in the presence of protrusions at the butt joint, as well as when the sensor is skewed. This is achieved by the fact that they are structurally laid on the edges of the main windings 14 and 15 and cover a smaller area of one of the sides.

The curvilinear connections are controlled so that the beginning of the butt joint is in the center of the sensitivity zone, the area of which is divided into unequal parts by the joint line. In the process of corrective action on the burner, the ratio of these areas is set to a predetermined value, for example, one.

Thus, the main advantage of the proposed tracking device is the transfer of the sensitivity zone of the sensor to the central region of thermal exposure. Thus, the task of placing the sensing element on the axis of thermal action is solved by covering the nozzle element of the burner and reducing the thermal effect on the sensor by moving it up the axis of the burner while maintaining high sensitivity to changes in the position of the joint.

Claims (1)

Invention Formula A butt tracking device containing a butt-coil sensor, the windings of which are wound on an insulating frame and placed in planes perpendicular to the axis of the welding torch, a generator connected to the butt-sensor, the output of which is through a measuring transducer 0 five re.ib poven to r-i iiii. mx pop delay;: svarochio movement: -; 1) pc. 1, distinguished by the fact that, in order to increase the tracking quality due to the crepe central to the welding torch; : sensor, the device is equipped with coz, an hour. m transformer, a chain followed by un) connected variable resistors ii by a capacitor, the coil of the sensor is out; i1spa of two additional; 1withful windings, rass. one above the other, with the main windings spanning the welding torch shifted one relative to the other and interconnected sequentially, close to each other, and the additional windings arranged symmetrically with respect to the common axis of symmetry of the main windings, not covering it, and each - at the same time with symmetric and h-opposite main windings, in this case the second ends of the additional windings are connected to the secondary winding of the matching transformer and a circuit of series-connected alternating x resistors, the total point of the main winding is coupled to the first measurable vhodo.m ritelnogo transducer and through the condenser a medium chain dot serially connected variable resistors, and the output of the generator is coupled to the primary winding of the matching transformer and the input of the measuring vtory.m of transducers: 1st. FIG. 2 Fig.d