SU815226A1 - Device for lifting job platform - Google Patents

Description

one

The invention relates to construction equipment, namely, devices for the construction of high-rise structures using a mine hoist.

A device for lifting the formwork of vertical monolithic reinforced concrete structures is known l.

The disadvantage of this device is the uneven lifting.

The known working platform for the erection of reinforced concrete pipes, comprising a rigid frame, mechanisms of movement, jack screws, and cam-shaped devices 2,

This working platform has the significant disadvantage that during the lifting process, distortions and stickings occur, causing it to jam on the mine hoist due to the asynchronous operation of the individual drives of the displacement mechanisms and aluritization springs that do not provide uniform load transfer to the cam-and-cam devices.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved by the fact that the device is equipped with rocker arms that hingely connect all the pairs

cam-cam devices and spring-loaded stops supported on the carriages of cam-cam devices, while the carriages are made with a supporting surface for interacting with the anvil, the rocker arms of the movable cam-cam devices are pivotally connected with the cargo screw, and the stationary - with the card0, except These displacement mechanisms share a common drive, containing transmission shafts and bevel gears.

FIG. 1 shows a general view.

5 of the platform lifting device; the section A-A in FIG. 2 / in FIG. 2 shows a kinematic and structural diagram of a common drive, a section BB in FIG. 1) FIG. 3 shows the mating of carriages of support-cam devices with frame guides, section B-B in FIG. 1; ° in FIGS. 4,5,6 and 7 — sequence of movement along the height of the device for lifting

5 working sites.

The device consists of a frame 1 with guides 2 and a ring 3 for the suspension of g 4 working platforms 5, on the frame 1 fixed worm

0 gears 6, opogycidia worms ki 7

and worm gears 8 with built-in locks 9, as well as bevel gears 10. Worm gears 7 and bevel gears 10 are connected by transmission shafts 11 driven by rotation of the V-belt transmission 12 from the electric motor 13. For resting the device on the shaft hoist 14, The frame is equipped with lower and upper support-cam devices 19 and 20, each of which contains two carriages 21, mated with two guides and fixed pivotally to the rocker arm 22, and the stops 23 hinge Anchored on the carriages to and under simaomye to the horizontal support surface 24 of the carriages 21 of the lower spring 25. The rockers supporting-cam devices

19 are pivotally connected in the central part to the frame 1, and the rocker arms of the upper cam-cam devices 20 are connected pivotally in the central part to the cargo screws 26 screwed on the nuts 9 of the worm gearboxes 6.

Device for lifting the working platform works as follows.

The stops 23 of the rocker arms 22 of the lower cam-and-cam devices 19, resting on the couplings 16 of the uprights 15 of the mine hoist 14, hold the frame 1 with the working platform 5 at a predetermined height h (Fig. 4). With the electric motor 13 turned on, the cargo screws 26 move the upper support up - cam devices 20 relative to the mine hoist 14 along the guides 2 of the fixed Frame 1. Support-cam devices 20 move upward until the stops 23, which are in an inclined position during the passage of the nodes of the crossbars 17, braces 18 and the shaft couplings 16 of the lift 14 does not occupy a horizontal position (by the action of the springs 25) above the couplings 16 mine hoist 14 which will subsequently serve as a support portion for lifting the device. Typically, the height of this overshoot is 150-200 mm.

When reverse motor 13 cargo screws 26 will move the upper support-cam device

20 down to the contact of the lugs 23 with the Gaft 16 of the mine hoist 14 (Fig. 4). Upon further rotation of the electric motor 13, the top support-cam devices 20, taken into the load and transferred to the shaft lift 14, will remain stationary, and the device frame 1 will move upward relative to the mine lift 14 upward, dragging the working platform 5 suspended to it ( Fig. 5), the lifting height of the frame 1 is somewhat larger than the pitch S of the sleeves 16 so that the stops 23 of the lower cam supporting device 19 are taken after passing the joints of the girders 17, diagonal bars 18 and the sleeves 16 horizontal th position by the force of the springs 25.

After the secondary reversal of the electric motor 13, the frame 1 is seated on the stops 23 of the lower cam-support device 19, but to a level located at a height of

5 h.

(where S is the coupling pitch 16 mines + S

14, i.e. lifting height of the device in one cycle). The completion of the landing of the frame 1 is marked by the appearance of a gap between the stops 23 of the upper support-cam device 20 and the ends of the sleeves 16 of the mine hoist 14 (Fig. 6 and 7).

The described operations are repeated with further movement (lifting and lowering) of the device.

Claims (2)

1. A device for lifting the working platform, comprising a frame, a working platform, movement mechanisms in the form of support-jaw devices mounted on carriages, fixed, mounted on a frame, and movable, mounted in guides and associated with cargo screws, and a drive, characterized in that, in order to increase the reliability of the device, it is equipped with rocker arms hinging in pairs all supporting cam devices and spring-loaded stops supported on the carriage of cam-supporting devices the carriages are provided with a supporting surface for engagement with the anvil, the rocker arms of the movable support-cam devices are hingedly connected with the load screw, and the fixed ones with the frame. 2. The device according to claim 1, characterized in that, in order to synchronize the operation of the movement mechanisms, they have a common drive comprising transmission shafts and bevel gears. Sources of information taken into account in the examination 1. The patent of the USSR 21927, cl. E 04, G 11/20, 1929. 2. Authors certificate of the USSR 137659, cl. E 04 G 3/16, 1960. 23 25 1 21 t ZS IZl /