JPS61199582A - Gas shielded arc welding equipment of rail - Google Patents

Abstract

PURPOSE:To perform the welding of high quality with high efficiency by having the welding chamber to shut off a weld zone from outside air and by welding fully automatically with controlling the welding conditions according to the shape of a rail. CONSTITUTION:The welding of rail bottom part is performed after performing the initial layer welding by one-side URANAMI welding and confirming the prescribed position by the detecting sensor 43' of axis Y position for welding rails 1, 1'. The welding of the rail bottom part is performed with the multilayer welding by gas shielded arc welding by selecting the welding conditions corresponding to welding position by an information processing part and by outputting respective information to each driving control part. The Y axis moving block 4' is ascended according to the progress of weld, which is detected by the axis Y position detecting sensor 43' and the welding height at each time is detected. The welding method of the rail stem part and head part is selected from a memory part by the information processing part. The rail is surrounded by moving the mobile type water cooling side face backing metal inside the welding chamber 2, the welding conditions accorded with the height are selected and the weld of the rail stem part and head part is performed with controlling each driving part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas-shielded arc welding device for railway rails, and in particular to automation and quality improvement of rail welding.

[Conventional technology]

Rail welding using the arc welding method is difficult to automate due to its complex cross-sectional shape, and is generally performed manually using the enclosed arc welding method.

This enclosed arc welding method involves surrounding the bottom and side surfaces of rail ends facing each other with a gap of approximately 1,711 cm, using a copper block that matches the shape of the rail, and using a low-hydrogen coated arc welding rod in a downward position. This is a manual welding method.

[Problem that the invention seeks to solve]

As mentioned above, the enclosed arc welding method has the problem that the quality of the welding is determined by the skill of the welding worker because it is manual welding, the welding time is relatively long, and the worker is tied to the task during the welding process. There is a point.

This invention was made in view of this situation, and by automating the management and control of welding conditions, we can stably supply high-quality joints and fully automate rule welding.
The object of the present invention is to provide a gas shielded arc welding device for rails that achieves high efficiency.

[Means for solving problems]

The rail gas-shielded arc welding apparatus of the present invention includes a welding machine main body, a welding chamber, and a control device for controlling these.

The welding machine body includes a welding torch section having a long and narrow welding nozzle, a welding wire feeding mechanism that feeds welding wire to the welding torch section, and an X-Y axis movement mechanism that moves the welding torch section in horizontal and vertical directions. , and a clamp mechanism for fixing the welding machine main body to the rail, which is the material to be welded.

The welding chamber is equipped with a shielding gas ejection section and a pair of movable water-cooled side supports, into which the welding nozzle of the welding machine main body is inserted, and the part of the rail to be welded is shielded from outside air.

The control device includes a rail position detection means for detecting the welding position of the rail, a storage section for storing the shape of the rail, welding methods and welding conditions at each part of the rail, and an output from the rail position detection means that is stored in the storage section. It consists of an information processing section that selects and outputs welding methods and welding conditions, and a drive control section that outputs control signals to each drive section. The drive control section includes an input section that takes in information from detection sensors of each part of the welding device, a calculation section that compares and calculates information from the information processing section and the input section, and a drive output section that outputs the calculation results to each drive section. Consisting of

Based on the rail position information from the rail position detecting means, this control device performs control such that the first layer welding is single-sided uranami welding, the rail bottom is welded by normal gas shield arc welding, and the rail belly and head part are electrogas arc welded.

[For production]

The present invention has a welding chamber that isolates the welding area from the outside air, and controls welding conditions according to the shape of the rail to perform fully automatic narrow gap welding by gas-shielded arc welding.

〔Example〕

FIG. 1 is a perspective view showing an embodiment of the present invention. II is the rail which is the material to be welded, 2 is the welding chamber, 3 is the welding torch part, 4, 4/ is the welding torch part 2
These are an X-axis moving block and an X-axis moving block that move the cursor in the horizontal and vertical directions.

5 is a welding wire feeding motor, 6 is a welding wire, 7 is a wire reel, 8 is a clamp mechanism for fixing the welding machine main body to the rail, and 9 is a welding current detection sensor.

The welding torch section 3 consists of a long, narrow-diameter welding nozzle 31, a nozzle rotation motor 32, and a nozzle rotation speed detection sensor 33.As shown in FIG. The welding nozzle 31 is rotated by a nozzle rotation motor 32 to ensure penetration of the inner surface of the groove.

an X-axis moving block 4 for moving this welding torch section 3;
The X-axis moving block 4' has X-axis and Y-axis moving motors 41, respectively.
, 41' and X-axis/Y-axis movement speed detection sensors 42, 42
' and X-axis/Y-axis position detection sensors 43 and 43'.

The welding wire feed motor 5 includes a wire feed speed detection sensor 51 and feeds the welding wire 6 to the welding torch section 3 via a pipe 52.

The welding chamber 2 is intended to isolate the welded parts of the rails 1 and 1' from the outside air and obtain a high-quality joint.As shown in Figure 3, the welding chamber 2 is equipped with a pair of movable water-cooled side butts 21 and 21'. It is provided inside with shield gas side jet ports 22 and 22' provided on the movable water-cooled side pads 21 and 21', and a head jet port 23 that sends shield gas from above the rail l to the rail head. 24 is a side abutment drive motor, and 25 is a side abutment drive shaft. 26.26' is a gas inlet that sends shielding gas to the side jet port 22.22';
7 is a gas inlet that sends shielding gas to the head nozzle, 28
, 287 are cooling water inlets for the movable water cooling side pads 21 and 21', and 29 and 29' are cooling water outlets. At the bottom of this welding chamber 2, a backing material 200, a tab material 201,
201' can be placed.

FIG. 4 is a block diagram showing the control device of this embodiment. In the figure, 401 is a rail position detection means consisting of a Y-axis position detection sensor 43', and a Y-axis moving block 4 that rises as welding progresses. ' is detected by the Y-axis position detection sensor 43/, the welding height is determined, and the welding position of the rail is determined and output.

402 is a storage unit that stores the shape of the rail, the welding method and welding conditions for each part of the rail, and 403 is a storage unit that receives an input signal from the rail position detection means 401 and stores the welding method and welding conditions according to the rail position. An information processing section 404 selects and decides from the stored contents, and a drive control section 404 controls the operation of the drive motor 405 of each part of the welding device.
Input unit 40 that takes in information from the detection sensor of each drive unit
6, a calculation unit 407 that compares and calculates information from the information processing unit 403 and the input unit 406, and a drive/output unit 408 that outputs the calculation results of the calculation unit 407 to each drive motor 405.

Feedback control UK of the drive control unit 404 controls the nozzle rotation speed, wire feeding speed, movement position of the X-axis movement block, movement speed of the X-axis movement block, and welding current. That is, the nozzle rotation speed control is performed by detecting the rotation speed of the nozzle rotation motor 32 using the nozzle rotation speed detection sensor 33 and performing feedback control. In addition, in the case of wire feeding speed control, the welding wire feeding motor 5 is controlled by the wire feeding speed detection sensor 51.
The rotational speed of the X-axis moving block is detected, and the movement position and movement speed of the X-axis moving block are controlled by the X-axis position detection sensor 43. X
An axis movement speed detection sensor 42 detects the position and rotation speed of the X-axis movement motor 41 to perform feedback control. Further, by utilizing the fact that the welding current changes as the wire protrusion length changes, the current value is detected by the welding current detection sensor 9 and compared with the target value to drive the Y-axis movement motor 41/ to move the Y-axis. It is controlled by moving the block 41 up and down.

Next, the operation of welding the rails 1, 1' according to the above embodiment will be explained with reference to FIGS. 3 to 6. FIG. 5 is a flowchart for welding the rails 1, 1/ according to the above embodiment, and FIG. 6 is a sectional view of the welding chamber 2.

In step 501, welding of the rails 1 and 11 is started, and in step 502, first layer welding is performed by single-sided uranami welding, and in step 503, a predetermined position is confirmed with the Y-axis position detection sensor 43', which is the rail position detection means 401. After that,
Weld the bottom of the rail.

For welding the bottom of the rail, in step 504 the welding method stored in the storage unit 402, that is, multi-layer welding using normal gas-shielded arc welding, is selected, and in step 505, welding conditions according to the welding position are selected in the information processing unit 403. , in step 506, each piece of information is output to each drive control unit 406K. This multilayer welding at the bottom of the rail is performed from the rail 1°11 to the movable water-cooled side abutment 21 as shown in Figure 3.
, 21' are separated. Next, in step 507, the height position of the rail is determined. Judgment of the height position of the rail is made as a result of welding current control, and as the welding progresses, Y
The axial movement block 41 rises, and the amount of rise is detected by the Y-axis position detection sensor 43', and the welding height at each point in time is detected.

After detecting the upper end position of the rail bottom, in step 508, the information processing unit 403 selects a welding method for the two rail belly heads from the storage unit 402. This welding method is electrogas arc welding. For this purpose, in step 509, as shown in FIG.
, 21' to surround the rail. In step 510, welding conditions are selected according to the height position of the rail, and in step 511, while controlling each drive part under the welding conditions according to the rail height position, welding of the rail abdomen and head is performed,
After determining the rail welding end position in step 512, the rail welding is finished in step 513.

That is, welding can be started by outputting the target values of each controlled variable, movement commands for the movable water-cooled side pads 21 and 21', opening/closing commands for the shield gas outlet, gas flow rate switching commands, etc. as programmed in advance. Welding is performed continuously and fully automatically from start to finish.

The welding voltage is controlled by outputting a target value to an external terminal of the welding power source, and opening/closing of the shielding gas and switching of the flow rate are performed by providing several electromagnetic valves in the gas cylinder.

Further, in this embodiment, the method of rotating the welding nozzle is used to ensure penetration of the inner surface of the groove, but other methods may be used to ensure penetration of the inner surface of the groove.

Table 1 shows a comparison of the tensile test results of the welded joint when rails were welded using the above example with that of conventional manual enclosed arc welding, and Table 2 shows the arc times for both types of welding. .

Table 2 The test rail was a normal high carbon steel rail with a weight of 60 kilometres, and the welding conditions for each part of the rail shown in FIG. 7 were as shown in Table 3.

From the above results, it is clear that the rail welding according to the present invention has higher quality and higher efficiency than conventional welding.

〔Effect of the invention〕

As mentioned above, the rail gas-shielded arc welding device of the present invention is capable of continuously and fully automatically welding rails, so high-quality welding can be achieved with high efficiency without being affected by the skill of the worker. This has the effect of greatly contributing to labor savings in rail welding.

Although the welding device of the present invention was developed for rail welding, it is possible to weld smaller parts by changing the welding chamber, clamp mechanism shape, and control program. i
It can also be used for butt welding of steel, etc.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view of the welding torch section, Fig. 3 is a side sectional view of the welding chamber, Fig. 4 is a four-dimensional diagram of the control device, and Fig. 5 The figure shows 70 of the control
-Chart, FIG. 6 is a side view of the welding chamber showing the operation of the movable water-cooled side welder, and FIG. 7 is an explanatory diagram showing welding conditions depending on the rail position. 1, l/... rail, 2... welding chamber, 3...
・Welding torch part, 4...X-axis moving block, 4'...
・Y-axis moving block, 5... welding wire feeding motor,
6... Welding wire, 7... Wire reel, 8...
Clamp mechanism, 21, 21'... Movable water-cooled side abutment, 22, 22/... Shield gas side outlet, 2
3... Head spout, 200... Backing material, 201,2
01'...Tab plate, 401...Rail position detection means, 4o2...Storage section, 4o3...Information processing section, 40
4... Drive control unit, 4o5... Drive motor, 4o6
...Input section, 4o7... Calculation section, 4o8... Drive output section. Agent Patent Attorney Sanro Kimura 112 Figure 4 Figure 5 WIk7 Figure

Claims (3)

[Claims] (1) A welding torch section having an elongated welding nozzle, a welding wire feeding mechanism that feeds the welding wire to the welding torch section, and an X/Y axis movement mechanism that moves the welding torch section in the horizontal and vertical directions. and a welding machine main body comprising a clamp mechanism for fixing the welding machine main body to a rail that is a material to be welded;
a welding chamber that includes a shielding gas blowout part and a pair of movable water-cooled side abutments, into which the welding nozzle is inserted and isolates the welding area from the outside air; a rail position detection means that detects the welding position of the rail; A storage unit that stores the shape of the rail, welding methods and welding conditions for each part of the rail, an information processing unit that selects and outputs the welding methods and welding conditions stored in the storage unit based on the output of the rail position detection means, and a welding device. a drive control section comprising an input section that takes in information from the detection sensor of each drive section, a calculation section that compares and calculates information from the information processing section and the input section, and a drive output section that outputs the calculation results to each drive section; Based on the rail position information input to the control device, the first layer welds can be welded on one side using Uranami welding, the bottom of the rail can be welded using normal gas-shielded arc welding, and the bottom of the rail can be welded using conventional gas-shielded arc welding.
Gas shielded arc welding equipment for rails with electro gas arc welding on the head. (2) The welding torch is equipped with a welding nozzle with a welding wire passing hole eccentrically located at the tip of the welding nozzle and a motor for rotating the nozzle to ensure penetration of the inner surface of the groove.
Gas-shielded arc welding equipment for rails as described in Section 2. (3) The position detection sensor attached to the X/Y axis movement mechanism detects the rail welding area at each point in time, and stores the welding current, welding voltage, welding speed, position of the movable water-cooled side pad, and shield in advance. The gas shield arc welding device for rails according to claims 1 and 2, wherein the gas flow rate and the rotational speed of the welding nozzle are controlled by a control device.