The roof fall safety guard is prevented in the self-raising tower crane jacking
The utility model relates to the anti-ejection device that emits of the jacking that is applied in the self-raising tower crane.
The height of self-raising tower crane is by (shown in Figure 1) of the quantity decision of the standard knot 1 of forming body of the tower.When increasing the height of tower machine 2, at first use oil cylinder jacking body of the tower stock 3, in body of the tower stock 3, reserve the locus (shown in Figure 2) of body of the tower standard knot, and then install newly-increased standard knot 4 (shown in Figure 3), repeat said process, increase the height of tower machine 2 one by one.
When practical operation, if careless manipulation or maloperation cause the oil cylinder jacking too high, tower rises stock 3 and is ejected body of the tower, will cause fatal crass's serious accident, and this type of accident also once had report (shown in Figure 4) repeatly.
The utility model content
The utility model is for avoiding above-mentioned existing in prior technology weak point, providing a kind of self-raising tower crane jacking to prevent the roof fall safety guard, to guarantee the safe and reliable of jacking process.
The utility model technical solution problem adopts following technical scheme:
The constructional feature of the anti-roof fall safety guard of the utility model self-raising tower crane jacking between body of the tower stock and the body of the tower standard knot, be positioned at and arrange above the roller; limit switch is set, and limit switch is arranged in the power control loop of jacking hydraulic actuating cylinder with its switch contact series connection.
Constructional feature of the present utility model also is:
Described limit switch has the transverse spring push rod that connects firmly with the body of the tower stock, the medial extremity of transverse spring push rod is a roller, roller is conflicted on the main chord of body of the tower standard knot with the spring pressure of transverse spring push rod, and be guide rail with the main chord, external side end at the transverse spring push rod is fixedly connected with the shake-up plate, and being positioned at the touch switch that touches the plate inboard and being to touch plate is the switch motion executive item; Touch switch is arranged in the power control loop of jacking hydraulic actuating cylinder with its switch contact series connection.
The contact surface of described roller is set to " V " shape groove, and the main chord of standard knot is pipe or square tube.
The elongation of described spring push-rod can be regulated.
Described limit switch is the photo-electric limit switch.
Compared with the prior art, the beneficial effects of the utility model are embodied in:
Some tower machines are the length that relies on the restriction jacking cylinder in the prior art, prevent the jacking roof fall.But work as misoperation, with the jacking crossbeam mistake of oil cylinder be put into standard knot on mark time when carrying out jacking, the serious accident of stock roof fall still can appear, the length that therefore limits jacking cylinder can't play the effect of actv. safety guard-safeguard.
The utility model adopts the physical construction of reliable in structure; its working stability and reliability are not subjected to the influence of factors such as weather, temperature, electromagnetic interference and voltage fluctuation; the various environment that can adapt to the camp site also can play the effect of the anti-deprotection of jacking immediately effectively under the situation of maloperation or careless manipulation.
Description of drawings
Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are the prior art structural representation.
Fig. 5 is the utility model limit switch structural representation.
Fig. 6 is a limit-switch positions structural representation in the utility model.
Fig. 7 is a structural representation on the utility model limit switch normal operation position.
Structural representation when Fig. 8 reaches spacing state for the utility model limit switch.
Fig. 9 the utility model roller structure scheme drawing.
Number in the figure: 1 standard knot, 11 main chords, 2 tower machines, 3 body of the tower stocks, 4 newly-increased standard knots, 5 spring push-rods, 6 rollers, 61 " V " type groove, 7 touch on plate, 8 touch switchs, 9 stocks and arrange roller.
Below by the specific embodiment, the utility model is described in further detail in conjunction with the accompanying drawings.
The specific embodiment
Referring to Fig. 5, Fig. 6, in the present embodiment, between body of the tower stock 3 and the body of the tower standard knot 1, be positioned at row roller above, limit switch is set.Limit switch is arranged in the power control loop of jacking hydraulic actuating cylinder with its switch contact series connection.
In concrete the enforcement, limit switch is set has the transverse spring push rod 5 that connects firmly with body of the tower stock 3, the elongation of spring push-rod 5 can be regulated, the medial extremity of transverse spring push rod 5 is a roller 6, roller 6 is conflicted on the main chord 11 of body of the tower standard knot 1 with the spring pressure of transverse spring push rod 5, and be guide rail with main chord 11, be fixedly connected with at the external side end of transverse spring push rod 5 and touch plate 7, being positioned at the touch switch 8 that touches the plate inboard and being to touch plate 7 is the switch motion executive item; Touch switch is arranged in the power control loop of jacking hydraulic actuating cylinder with its switch contact series connection.
Referring to Fig. 9, the contact surface of roller 6 is set to " V " shape groove 61, and the main chord 11 of standard knot is pipe or square tube.
Limit switch is for can adopt mechanical type or photo-electric limit switch.
Whole device adopts the form of shroud ring to be fixed on the body of the tower stock 3, can for convenience detach and adjustment installation site.
In concrete the enforcement, for meeting 3.3 regulations among " tower crane safety procedure " GB5144-2006, limit switch should be arranged on the 60mm position of the line of centers top of row's roller 9 on the stock, or on the farther position.
When the normal jacking of tower machine supernumerary segment operation, prevent emitting the roller on the ejection device on the main chord of body of the tower standard knot, to slide, because the counteraction of main chord, the anti-spring pressurized that emits on the ejection device, spring push-rod moves towards the direction of arrow, drives to touch the contact that plate leaves touch switch, touch switch is in conducting state, at this moment the power supply of oil cylinder electrical motor is connected, and jacking cylinder can normal operation, and is shown in Figure 7.
When the operation of tower machine supernumerary segment occurs unusual; the stock jacking has exceeded safe scope; at this moment the anti-main chord that emits ejection device stream wheel to skid off standard knot, under the effect of spring, spring push-rod and shake-up plate move to the direction of arrow; touch the contact that plate presses touch switch; the contact open of touch switch, thereby the control circuit of cut-out oil cylinder electrical motor, the outage of oil cylinder motor is out of service; oil cylinder also stops jacking, has played the anti-roof fall protective effect of stock jacking.