SC/SCD type construction lifter is a kind of the gear, rack drive, with crane cage manned, small, and along the guide frame for vertical transportation of construction machinery. It can be layered conveying for all types of building materials and construction personnel, and can be very convenient to install and remove land, buildings with increased and easily heightening. Widely used in high-rise buildings, television tower, Bridges, water tower, power stations, chimney, engineering construction. In this paper the author in many years of practice, found this type of construction lifter few generality questions and take out the corresponding solution, especially with all the people published in this discussion.
Accompanying cable damage easily
Construction lifter lifting cage during operation, cable hanging together with the cage for up and down movement (this cable called accompanying cable). The existing technology in the layout of the cable form has two kinds: one kind is cable cage form (figure 1 a), and the other is the cable pulley form (figure 1 b), still have a kind of special rail type cable pulley principle and the same). The current most construction lifter use of cables are YC (W) general rubber type of soft cable, the cable cross section are shown in figure 2 a shows:
Generally speaking, general rubber set of soft rubber insulation and the cable suitable outer rubber sheath space between the shoesole with filling, to ensure that the same length pellets of cables; With cellophane and so on materials layer between the guarantee and outer sheath not suitable adhesion. But this kind of cable used in cable cage construction lifter form of the accompanying cable will cause problems: because in the job, along with construction lifter crane cage up and down movement, along with cable and dish out or disk into the circular cable cage, doing the circumferential form plate or dish out into the process, polishing and outer rubber sheath will happen between relative displacement, because each of the different size and polishing displacement can't recover, use after a period of time, a root (or a few root) will be difficult in cable in different parts U local accumulation, finally has the figure 3 bulge phenomenon, then the skin to appear damaged, appear then broken core, leakage wait for a phenomenon.
This paper based on the above problem, made a large survey analysis, and with the production of professional manufacturers cable has carried on many times the research, finally produced a new type of cable, cross section such as (FIG. 2 b) shows, this kind of polishing the cable between the space filled with all rubber, no additional rubber skin, namely each polishing mutual adhesion, suitable each, each with skin between polishing can not be between displacement and avoid the generation of the bulge phenomenon.
In addition, the heavy construction lifter use cable pulley form, from the bottom of the cage distribution box to guide frame of the Central Line frame this pick a cable installation method has always been a problem, because if it was a cable fixed in the guide frame outside, it's easy to be other parts brush touch and damaged, if on the guide frame internal, the guide frame and festival is very troublesome. The author in the discovery in practice will this a cable fixed in the building and guide frame of attached on the wall is a good idea, see (figure 1 b), where no moving parts after, cable is not easy to damage, and add section cable up very convenient.
Cable guide frame of the baffle short life
To ensure the correct orientation and the accompanying cable tie up to prevent hang, along the guide frame every certain height are installed a cable guide frame (see chart 1), each with two paddle guide shelf (see chart 4), ensure that cable always in guide frame in the box. Construction lifter in use process, cable fixed device hit the baffle every day over 100 times, each year up to tens of thousands. So the flap of hardness, flexibility, wear resistance and the requirements of the anti-aging higher. Most current construction lifter is using rubber parts, cannot satisfy the requirements, the general use in six months after the 20000 times or so or after hit, all appear rupture and excessive wear.
In order to solve the above problems, the writer tried a variety of materials, and a final project plastic products plant cooperation, after many tests, many times change formula, finally produced the good performance of baffle. Simulation experiment work condition, and the results show that the baffle 80000 after time after the crash, still could satisfy the requirements of operation. The service life of the baffle prolonged greatly.
Crane cage up leap braking dynamic phenomenon
The author is engaged in construction lifter field for many years, and often have asked the same question users: I started the construction lifter with very well, recently in the braking crane cage always produces move up and down there, and more and more serious, the company take personnel trepidation.
Therefore, the author many times to the construction site for the answers. After the check, found the cause of two reasons: one is the gear and large clearance rack, the braking reciprocating impact; Two is to guide roller and guide rail contact uneven or large clearance. After installation construction lifter over a period of time, use, small gear and roller all can produce wear, connection parts of the bolt will loose, natural appear above two kinds of circumstances, it is normal. But as the little gear transmission mechanism in the back, it is difficult to find in gear and professional personnel changes clearance rack. At the same time hanging on the cage every only guide roller as many as 20 several, non-professional workers also not easy to find not normally, the problems which have all don't know the reason.
In this the author tell users, if hanging in the cage braking and dynamic situation produced there, just please professional personnel adjustment over parts of the gap, ensure that small gear and rack of lateral clearance 0.2 ~ 0.5 mm, roller and guide rail gap 0.5 mm, can eliminate the phenomenon. Also need to remind the user, please be sure to use the products of the specification requirements do product maintenance, this to guarantee the machine performance characteristics and prolong service life greatly.
English
