JPH062309B2 - Automatic overlay welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating device in which a welding torch is preceded by a sensor for detecting a build-up height by a predetermined distance, and a crushing mill bawl having a complicated surface shape is mounted based on the output of the sensor. The present invention relates to an automatic overlay welding device that controls the rotation speed of the.

Conventionally, in the multilayer overlay welding of the surface of a crushing mill baul, overlay welding is performed at a constant rotation speed.

However, in this method, since the peripheral speed changes according to the change in the diameter of the build-up position, there is a problem that the weld bead shape changes and the build-up height becomes uneven. Further, since the surface of the crushing mill baul has a slope and the surface after use is worn and has a complicated uneven shape, a good welding result cannot be obtained by the conventional welding method.

For this reason, in the past, the operator had to manually control it one by one, resulting in poor work efficiency.

The present invention has been made to solve the above problems, and an object thereof is to automatically control the rotation speed of a rotating device according to the shape of the surface of a crushing mill baul to efficiently control the build-up height. However, it is an object of the present invention to provide an automatic build-up welding apparatus that can obtain a smooth surface layer.

In order to achieve the above object, the present invention provides a sensor unit including a position detection sensor and a position detection mechanism, and a build-up height detection mechanism that detects a required build-up height by inputting a position signal from the sensor unit. A rotation speed calculation unit that calculates a rotation speed based on a signal from the build-up height detection mechanism; and a rotation speed control unit that receives the output signal from the rotation speed calculation unit and controls the speed of the rotating device. , And a sequence unit for integrally controlling the above mechanical units.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 (a) is a plan view of a crushing mill bawl, FIG. 1 (b) is a side view of the crushing mill bawl in fracture, and FIG. 2 is a main control system of an automatic overlay welding apparatus according to the present invention. Block diagram shown in FIG. 3, FIG. 3 is a block connection diagram of the welding apparatus, FIG. 4 is a flow chart showing a procedure of overlay welding work, and FIGS. 5 (a) and 5 (b) are explanatory views showing a sensing method by a sensor. FIG. 6 is a fractured side view showing the overlay welding state, and FIG. 7 is a diagram showing the relationship between the overlay height and the peripheral velocity per layer obtained experimentally.

The crushing mill bawl 1 shown in FIGS. 1 (a) and 1 (b) is for crushing lumps of coal or the like by relative sliding with a roll while rotating in the crushing mill. A plurality of divided trapezoidal-shaped bawl segments 3 are set on the inner peripheral surface of the housing 4. Then, a hardfacing welded portion 2 is formed on the surface of each of these baul segments 3 for enhancing their wear resistance, and the figure shows a state in which they are worn to a certain depth by crushing.

The crushing mill baul 1 is rotatably supported by a rotating device 15 as shown in FIGS. 2 and 3. On the other hand, a traveling carriage 17 is provided on the rail 21 so as to be movable in the x-axis direction, and the traveling carriage 17 is provided with a position detection mechanism 11. A wire feeding device 10 and a welding torch 6 are attached to the traveling carriage 17 via a torch support portion 9. A sensor 8 is fixed to the welding torch 6 via a fixing plate 7, and the sensor 8 detects the y-coordinate position of the overlay 20. Further, the traveling carriage 17 is provided with a welding control unit 18 for controlling the feeding speed of the wire feeding device 10 for feeding the welding wire 5.

In addition, between the position detection mechanism 11 and the rotation device 15, the built-up height detection mechanism 12, the rotation speed calculation unit 13, and the rotation device 15 which operate by receiving output signals from the position detection mechanism 11 and the sensor 8. Rotation speed control unit 1 for controlling rotation speed
4 is electrically connected. Further, between the welding control unit 18 and the rotation speed control unit 15, a sequence unit 16 that collectively controls these is electrically connected. The third
In the figure, 19 is attached to the rotating device 15 of the crushing mill bawl 1, and the traveling carriage 17 is fixed at a constant distance in the radial direction (x-axis direction) of the crushing mill bawl 1 for each revolution of the crushing mill bawl 1. Limit switch for moving and stopping,
22 is a power source for welding.

Then, the traveling carriage 17 is driven to detect the position by the sensor 8 and the position detecting mechanism 11. Output signals from the sensor 8 and the position detecting mechanism 11 are input to the build-up height detecting mechanism 12. To be done. The build-up height detection mechanism 12 detects the build-up height based on the input signal, and the rotation speed calculation unit 13 receives the output signal from the build-up height detection mechanism 12 and receives the build-up height and the rotation speed. A proper rotation speed is required from the relationship with. In response to the output signal from the rotation speed calculation unit 13, the rotation speed control unit 14 controls the rotation speed of the rotating device 15, so that the crushing mill bawl 1 is rotated at a predetermined peripheral speed.

At the same time, the sequence unit 16 gives a command to the welding control unit 18 to enable welding while controlling the wire feeding speed of the wire feeding device 10 and the traveling speed of the traveling carriage 17. In this automatic build-up welding apparatus, the traveling switch 17 can be moved by a fixed pitch in the radial direction (X direction) of the crushing mill baul 1 each time the crushing mill bawl 1 is rotated by the operation of the limit switch 19.

The flow chart of the automatic build-up welding performed by the mechanism described above is shown in FIG. 4, and the welding control unit 18 sets welding conditions such as the current I, the voltage E, and the pitch P at step 401, and step 402. From sensor to 406
And the position detection mechanism 11 detects the position two-dimensionally, and the position coordinates (x, y) at this time are read into the build-up height detection mechanism 12, and the maximum required build-up height Y _max and the meat per hit are obtained. The height .DELTA.Hmax, the number N of layers, and the number M of build-up passes in each layer are set.

Next, welding is performed from step 407 to step 412 while controlling the rotation speed for each pass, and this is repeated M times.

The above-described operations from Steps 406 to 412 are repeated for N layers to perform multilayer build-up welding, and when Step 413 is reached, the welding is completed.

For detecting the position by the sensor 8, the position coordinates y are read at equal intervals as shown in FIG.
Based on the detection of this position, the rotation speed calculation unit 13 calculates the rotation speed such that the peripheral speed of the crushing mill bawl 1 becomes constant, and the speed control of the rotation device 15 is thereby performed. Is done. In overlay welding, the maximum required overlay height Mmax as shown in FIG.
Is set, and with a constant pitch P, a constant build-up height Δ up to N layers
Multilayer overlay welding is performed for each Hmax.

By the way, the rotation peripheral speed V of the crushing mill baul 1 is 7th.
From the experimental data shown in the figure, since it is a function of the overlay height ΔH per layer, the current values I ₁ , I ₂ , I ₃ can be seen from the graph of FIG.
Therefore, the optimum value of the peripheral speed V can be obtained.

As described above, according to the present invention, it is possible to automate overlay welding, and it is possible to shorten the welding time and improve the welding quality by reducing the number of steps.

[Brief description of drawings]

Fig. 1 (a) is a plan view of a crushing mill bawl, Fig. 1 (b) is a side view of the crushing mill bawl in fracture, and Fig. 2 is an overall configuration diagram of an automatic overlay welding apparatus according to the present invention. Fig. 3 is a block connection diagram of the welding equipment, Fig. 4 is a flow chart of overlay welding work, Figs. 5 (a) and 5 (b) are explanatory diagrams showing a sensing method by a sensor, and Fig. 6 is overlay welding. FIG. 7 is a fractured side view showing the state, and FIG. 7 is a diagram showing the relationship between the build-up height per layer and the peripheral speed obtained experimentally. In the figure, 1 is a crushing mill baul, 6 is a welding torch, 8 is a sensor, 10 is a wire feeding device, 11 is a position detection mechanism, 12 is a build-up height detection mechanism, 13 is a rotation speed calculation unit, and 14 is A rotational speed control unit, 15 is a rotating device, 16 is a sequence unit, 17 is a traveling carriage, 18 is a welding control unit, 19 is a limit switch, and 22 is a welding power source.

Claims (1)

[Claims] Claim: What is claimed is: 1. A sensor unit comprising a position detection sensor and a position detection mechanism mounted on a traveling carriage that is movably installed in a radial direction of a crushing mill bawl, and a position signal from the sensor unit is input. As a build-up height detection mechanism for detecting the required build-up height, and the rotation speed from the relationship between the build-up height and the grinding peripheral baul rotation speed previously obtained based on a signal from the build-up height detection mechanism. A rotation speed calculation unit for calculating, a rotation speed control unit for controlling the rotation speed of a rotating device that rotates and drives the crushing mill baul in response to an output signal from the rotation speed calculation unit, and overall control of each of the above mechanical units An automatic build-up welding device, characterized in that it is provided with a sequence section for