SU870613A1 - Method of replacing sectionated turntables of excavator slewing gear - Google Patents

Description

(54) METHOD FOR REPLACING THE SECTIONAL SUPPORT CIRCLES OF SUPPORT AND ROTARY DEVICES OF THE EXCAVATOR

one

This invention relates to machines and mechanisms with rotary support devices used on rotary excavators.

There is a known method of replacing sectional wheels of a turntable of an excavator, which is carried out in the case of medium and major repairs, when it is necessary to disassemble it into assemblies and parts 1.

This repair involves laying the boom in a horizontal position on two sleeper cages or dismantling it and laying the crane aside on the sleeper linings. In all cases, before loosening the boom ropes, a support from a sleeper cage or pillars must be placed under the rear part of the turntable, for failure to comply with this requirement may result in bending and breaking of the center pin.

To roll out the undercarriage from under the turntable, the latter must be raised to such a height that the central trunnion is completely out of the hub of the central opening of the turntable.

For this, sleeper cages are placed on the sides of the front of the excavator. A pack of rails is brought under the turntable, which are raised with jacks mounted on the sleeper cages. As you climb under the rails enclose sleepers. The rear part of the turntable is jacked up on the back sleeper cage. A carriage with a winch or a tractor rolls out into the lumen formed in the front part.

There is also known a method of replacing the sectional wheels of the slewing bearings of an excavator, including disassembling and assembling the sections of the circles and rollers in the separator 2.

This method provides for a mandatory alignment of the excavator, and the excavator must be installed on a special platform with not more than O-30 ° and allowing a specific pressure of 3-4 kg / cm 2.

At the same time, the turning part of the excavator is installed in a strictly defined position relative to the support part and is 287 s in length so that the longitudinal axes of the rotor arm and the console of the counterweight are parallel to the axis of the skis. Next, the lower frame is reinforced at the installation sites of the mounting jacks, and all the assembly units are installed on the side of the counterweight console. On the bottom frame, the jacking plates are laid out and fastened on the marking, and then the jacks are installed. Then the rotary part of the excavator is raised so that a space is formed between the bases of the rails for dismantling and mounting the support wheels. The disadvantage of this method is that it is necessary to raise and lower the rotary part of the excavator, which is a long and laborious process, requiring a strict sequence of operations using expensive equipment and special expensive equipment, as well as attracting a large number of highly qualified specialists. All this leads to unnecessary laboriousness and excessive repair just an excavator. The aim of the invention is to reduce the downtime of the excavator and the complexity of the repair work. The goal is achieved by the fact that in the method of replacing the sectional support wheels of the turntables of an excavator, which has a platform that includes disassembling and assembling the section of circles and rollers in the separator, remove the separator through the part of the rollers made in the platform, moving them to align with the opening, and then the support circle section is disconnected from the other sections, this section is removed through the gap formed between the non-rotary part of the excavator and the separator, and in its place a new section is installed through this gap Porn circle. The essence of the method for replacing the sectional wheels of the turntables is illustrated in the drawings, where in FIG. 1 shows a diagram of the dismounting of sections of the support track; in fig. 2 shows section A-A in FIG. 1. Before replacing the support rail section 1 from the separator 2 of the roller wheel 3, a group of rollers 4 is dismantled so that the length Lj of the section of the rail wheel 1 is less than the total length Lj of the removed rollers 4. Then turn the turntable 5 and set it up so that the roller Circle 3 with its dismantled part was installed above the section of the rail wheel to be replaced. After that, the fastener 6 is removed, securing the joints of the sections 1 to each other, and the external stops 7, which are installed at the base along the entire length of the rail wheel 1, are removed. The internal stops 8 cannot be dismantled. 3 Through the gap H formed between the separator 2 of the roller wheel 3 and the base of the support part 9 or the rotary part of the platform, using lifting means, alternately disassembling the worn sections of the support rail 1 is carried out. Install the new sections of the rail wheel 1 as follows. A new section is supplied to the vacant space of the section of the rail wheel and is installed so that its base abuts against the abutments 8, which define the radius of the rail wheel. After that, fasteners 6 and abutments 7 are installed, which are welded by electric welding to the base of the turntable. Then a rigid fixation of the track 1 section is carried out. An example of the replacement of the support rail circle of a rotary platform of a rotary excavator ERSHR-1600, carried out according to this method. Parameters of a turntable: a turntable - a reversible, full-turn; height above ground level 16 m; 2500t turning platform mass; diameter of the track circle axis is 15 m; number of sections 8 scht. from rail type OR-43; length of one section of the rail wheel 5500 mm; weight of one section is 822 kg; the number of support rollers 102 schm; outer diameter of the support roller 400 mm; weight of one roller 120 kg. Directly in the face with the help of a leveling mechanism installed permanently on an excavator, the latter was aligned so that its slope does not exceed 0-30 °. Then, with the help of an electric bridge crane, new sections of the rail wheel were lifted and placed on the platform around the circle of a turntableJ .Q rotary platform device. After that, using the rotation mechanism, the telpher alternately removed 13 rollers through the existing openings in the rotary platform, the sum of diameters exceeding the length of one section by the amount of schaga between the rollers, since this condition allowed the rail section to be separated from the adjacent sections. The axes of the removed rollers were installed in their places in the separator. After this, the excavator platform was rotated with a turning mechanism so that the free part of the roller wheel was placed above the section to be replaced. Then, the dismantling of the butt plates, stops and fasteners of the replaced section was carried out. The unfixed section of the support rail on the backplates was shifted to the side and lowered to the ground with a crane. The new section was put in place worn out and secured. Further, by the next turn of the platform, the next section of the reference

rail wheel and made its replacement as described above.

Using this method made it possible to reduce the planned maintenance of a simple excavator for 30 days, which corresponds to an increase in the annual production of the excavator by 2.5 million meters of overburden, with a daily productivity of 50 Toic. m

Claims (2)

1.Kokh P.I. Excavator repair. M., Mashgiz, 1957, p. 28 2. Rotor excavator ERSHR-1600. Repair manual for rail circles of the turning part of the machine, No. 5 RD, NKMZ, Kramatorsk, 1976 (prototype).