Core tips: innovative methods: engineering machinery structural parts welding positioner analysis. Outrigger, rollover and double column single rotary type. Due to the limit of the degree of freedom of rotation, these machines can not rotate the welds in the space freely, and can not turn all kinds of welds to the best position needed.
The basic types of commonly used manual welding positioner are outrigger, tilting rotary type and double column single rotary type. Due to the limit of the degree of freedom of rotation, these machines can not rotate the welds in the space freely, and can not turn all kinds of welds to the best position needed. In the past, many kinds of welding positioner were introduced from all over the country, but it was not convenient to be used on site, so it was eliminated. In order to develop suitable displacement machine, after years of research and practice, the main idea is inspired by the structural welding robot imported from abroad. The welding positioner equipped on the welding robot is advanced and suitable for welding the structural parts of the domestic construction machinery industry. According to the experience of site application, the selection of welding positioner and the forms of commonly used positioner are analyzed and introduced. For reference only.
1 the meaning of welding positioner using structural parts of construction machinery
Most of the construction machinery, such as excavator, road roller and loader, are very complex and are the key components of the whole machine. The quality of welding directly affects the performance of the whole machine. It is advantageous to improve the quality of welding and production efficiency, reduce the labor intensity and production cost of the workers, strengthen the safety and civilized production, and be beneficial to the field management. Especially the impact of WTO entry, the competition of engineering machinery market will be more and more fierce. The domestic enterprises must adapt to the situation and enter the revolution of production capacity by welding the basic equipment such as positioner.
Selection of welding positioner for 2 structure parts
According to the structural characteristics of welded structural parts, choose suitable welding positioner. For example: the rear frame of the loader and the rack of the roller can be used in a double column single rotation mode, the front frame of the loader is optional L type double rotary. The loader bucket welding converter can be designed to be C type double rotary, the excavator frame and the big arm can be used in two seat and tail double rotary type. For some small assembly welding parts, the current market can be selected. A pedestal general-purpose converter which has been produced in a series of production.
(2) according to the manual welding operation, the selected welding positioner can transfer any weld of the welder to the position of flat welding or ship welding to avoid vertical welding and back welding, so as to ensure the quality of welding.
3. Choose the welding positioner with good openness, easy operation, compact structure and small floor area. The workers should operate as low as possible and be safe and reliable. The design of the tooling should consider the simple and convenient installation of the workpiece.
4. The welding operation of large scale welding structure parts of construction machinery is very high, and workers can be welded by pad height. The selection of the welding staircase directly affects the use of the welding positioner, and the view height can be made by a small fixed staircase, three-dimensional or two dimensional automatic mobile welding elevator.
3 kinds of commonly used converter structure
(1) double column single rotary variable displacement machine: this kind of variable position machine is suitable for the welding of engineering mechanical rectangular parts such as the rear frame of the loader and the frame of the roller. The form is like 1 patterns, which are mainly characterized by the operation of the motor driving device at one end of the vertical column and the other end driven with the active end. Both sides of the column can be designed to lift and adapt to different specifications of 名媛直播. The disadvantages of this type of position changing machine can only be turned in a circumferential direction, and the choice of weld form should be paid attention to.
2. U double seat and tail double rotary type: compared with the first type of displacement type, that is, on the basis of second kinds of Figure 1, the welded structure is added a rotational degree of freedom in the other space. As in Figure 2, the welding space of this type of change machine is large, the workpiece can be rotated to the required position, the design is advanced, and it has been used successfully by many manufacturers in the engineering machinery. The positioning machine can be applied to the structural parts such as loaders, excavators and rollers according to the technological conditions of the factories.
(3) L double rotary welding positioner: this type of displacement machine, as shown in Figure 3, its working device L, has two revolving degrees of freedom, and the two directions can rotate at about 360 degrees. Compared with other types of positioning machines, this position controller is open and easy to operate. The L type displacement machine has been successfully used in the welding of the front frame of the loader, and the effect is very good.
(4) C double rotary welding positioner: if graphic 4, the C type rotary form is the same as that of the L type machine, only for the convenience of the specific design, according to the shape of the structure, the working device of the positioner is slightly changed. This type of welding positioner is suitable for welding of bucket of loader and bucket of excavator. String 7
5 seat type general change machine: for example, the worktable of 5 seat type welding positioner has a total flipping degree of freedom, which can turn the work into the ideal welding position for welding. There is also a rotational degree of freedom for the worktable. This kind of transformer has been produced by a series of manufacturers. It is suitable for small welding parts of engineering machinery and some small and medium complex structures, such as tube, shaft, disk and so on.
From the schematic diagram of several transformer, it can be seen that the total type of the transformer can be divided into two types, one kind of double base and the other is the hanging type of the single machine working device. Two the salient features of the structural form decide that the focal points are different when designing the two welding positioner, for example, the L and C type displacement machines should fully consider the balance. When selecting the displacement machine, it should be selected according to the shape of the workpiece, the form of the weld and the status of the technology. Otherwise, it may not be good or useless.
4 concluding remarks
The welding of large structure parts in foreign countries is generally used by manipulator. It is not mature to replace manual welding operation with welding robot completely from the present state of technology and equipment input in China. But without a welding positioner, it is impossible for some vertical and inverted welds in complex structures to be manually adjusted to easy welding or ship welding position. Workers can not perform according to the welding process, and the quality of welding can not be guaranteed.
Moreover, most of the structure parts of the engineering machinery are very irregular, such as the front frame of the loader, the big arm of the excavator and so on. The welding seam is complex, the shape is large and the weight is heavy, it is turned over by the crane or other hoisting equipment. It not only takes up the hoisting equipment frequently, but also has low welding efficiency, but the field operation is extremely barbarous, and there is some extreme barbaric operation. Security risks. Therefore, in recent years, artificial welding positioner has been widely recognized by the domestic construction machinery industry, and this investment is being increased.
