RU2760061C1 - Packaged telescopic mast with chain hoist - Google Patents

Abstract

FIELD: lifting devices.SUBSTANCE: invention relates to lifting devices and can be used in mobile and stationary installations for various purposes. The telescopic mast contains a fixed first section and movable sections, which include locks and stops designed to grip and fix the movable sections, as well as a gear motor. The mechanism for extending the sections of the telescopic mast is made on the basis of a chain, the profile of the links of which is made with a locking pin at one end, which prevents the chain from folding in one direction after its straightening, which ensures the transfer of force in two directions. One end of the chain is attached to the lower flange of the upper pull-out section, its other end is laid in the chain store, fixed to the first section by means of a bracket, windows for the passage of the chain are made in the lower flanges of the movable sections. The lock is designed as a mechanism with two working positions. At the end of the chain there is a damper device, which is a pack of Belleville springs.EFFECT: providing improved reliability, speed of deployment and load capacity.2 cl, 13 dwg

Description

The technical field to which the invention relates

The invention relates to lifting devices, and can be used in mobile and stationary installations for various purposes.

State of the art

Known telescopic mast (AS SU 1626287 publ. 07.02.91), including the base, outer, intermediate and inner sections, in the lower parts of which are installed nuts, locks of the folded and unfolded states of the mast and mechanisms for controlling the locks.

The disadvantage of this technical solution is low operational reliability due to the installation of folded locks in an inaccessible area.

The closest analogue is known, a telescopic mast (patent RU 2198131 publ. 02/10/2003), which contains a base, intermediate and inner sections, a screw-nut mast lifting mechanism, unfolded state locks and mast folded state locks. An electric motor is fixed on the fixed outer section and a planetary gearbox is installed inside.

This design is complex due to the use of separately deployed locks and folded locks. Also, the screw-nut mast lifting mechanism has a low value of the efficiency, which reduces the speed of extension of the mast sections. Sequential extension of the mast sections, starting from the upper section further to the lower one, leads to a gradual increase in the friction force during extension under the influence of a lateral force (for example, a wind load). Thus, the lifting capacity of the hoist is reduced.

The essence of the invention

The object of the claimed invention is to provide a telescopic mast with improved characteristics.

The technical result achieved by the proposed invention consists in increasing the reliability, deployment speed and carrying capacity.

The technical result is achieved due to the fact that a telescopic mast with a batch extension of sections with a lifting mechanism based on a chain contains a fixed first section and movable sections, which include locks and stops designed to grip and fix the movable sections, a gear motor, an extension mechanism of sections is made on the basis of a chain, the profile of the links of which is made with a locking pin at one end, which prevents the chain from folding in one direction after its straightening, which ensures the transfer of force in two directions, while one end of the chain is attached to the lower flange of the upper pull-out section, its other end stacked in the chain store, fixed on the first section by means of a bracket, windows for the passage of the chain are made in the lower flanges of the movable sections, the lock is made in the form of a mechanism having two working positions, the cam of which is made with the possibility of contact with the stops located in the movable sections and with the possibility moving the flag out of position stop on one section to the position of stop on another section, a damper device is located at the end of the chain, which is a package of Belleville springs, limit switches are installed to signal the upper and lower positions, while the limit switch for extending the mast to full height is built into the store, and the limit switch the switch of the transport position of the mast sections is fixed on the first section or object of the carrier, the shaft of the manual drive mechanism is installed in the gear motor, and a revolution sensor is located on the axis of the drive sprocket to determine the lift height.

In the embodiment, the supporting flanges with windows for the passage of the chain can be fixed on the lower flanges of the sliding sections of the mast by means of built-in clamps, while the clamps are made in the form of mechanisms having two working positions, the cam of which is made with the possibility of contact with the stops located in the movable sections, and with the possibility of transferring the side bearing from the suspension position to one section to the stop position to the other section.

Brief Description of Drawings

Figure 1 shows a general view of the mast in a folded state.

Figure 2 shows the mast in a collapsed state in section.

Figure 3 shows a packet diagram of the extension of the mast.

Figure 4 shows a chain with a locking pin.

Figure 5 shows a General view of the lock in section.

6 shows the lock in the state of holding the section on the bag.

7 shows the lock in a state of holding a section on an underlying section.

Figure 8 shows a damper device.

Figure 9 shows a general view of the supporting flange,

Fig. 10 is a perspective view of the retaining flange retainer.

Figures 11 and 12 show the supporting flanges in a suspended state from an overlying section and in a fixed state on an underlying mast section, respectively.

Fig. 13 shows a perspective view of a chain magazine with a chain laid.

Implementation of the invention

The figures indicate:

1 - fixed first section;

2 - gear motor;

3 - chain store;

4 - drive sprocket in the housing;

5 - bracket;

6 - sliding sections;

7- chain;

8 - upper section;

9 - blocking finger;

10 - locks;

11 - stops in the lower flanges of the sliding sections;

12 - the second section is retractable;

1 - stops in the walls of the sections;

2 - cam;

3 - flags;

4 - the third section is retractable;

5 - key;

6 - the body of the lock;

19-21 - axles of the lock;

22 - spring;

23 - disc springs;

24 - retainer for supporting flanges;

25 - retainer body;

26 - retainer slide;

27 - lock cam;

28 - retainer pin;

29 - ball;

30 - retainer spring;

31 - retainer axis;

32 - supporting flanges;

33 - stop of supporting flanges.

Implementation of the invention

The extension of the mast sections is carried out sequentially in a package containing all the extension sections. When the second section 12 reaches the working position by the package containing all the retractable sections, the second section 12 is separated from the package of retractable sections 6 and the second section 12 is fixed on the first stationary section 1. At this time, the package of retractable sections 6 of the mast continues to move. Further, the following sections are sequentially separated from the package of retractable sections 6 and fixed on the underlying sections, thus, all sections are extended. The retraction of the mast sections is carried out in the reverse order, starting from the upper section.

The lifting of the mast occurs due to the transfer of torque from the gear motor 2 to the drive sprocket 4, which drives the chain 7, the chain is straightened until closed by the locking pin 9 (Fig. 4). Further, the chain 7 drives the upper section 8, as a result of the lifting of which, the lower section is abutted by flags 15 from the composition of the locks 10 against the stops 11 in the lower flanges (figure 2). Similarly, the rest of the sliding sections are suspended by the locks 10 for the stops 11 of the above-located sections and the package rises after the upper section 8. In the process of lifting the package of the sliding sections 6 when the cams 14 from the locks 10 reach the second section 12 of the stop 13 in the wall of the first section 1 (Fig. .3), the locks 10 are triggered: the stop 13 in the wall of the first section 1 presses on the cam 14 of the lock 10 of the second section 12 (Fig. 6), which in turn, through the axis 20, moves the flag 15 from the position in which it rests on the stop 11 of the third section 16, in a position in which it rests on the stop 13 in the wall of the first section 1, releasing the stack of sliding sections 6 and fixing the second section 12 on the first section 1 (Fig. 7). The spring 22 of the lock 10 is designed to prevent the flag 15 and the cam 14 from stopping in an intermediate state. Likewise, all other pull-out sections assume their working positions.

The mast is lowered in reverse order, starting from the top section.

In the process of raising and lowering, the sliding sections 6 of the mast are protected from rotation around their axis by dowels 17. To reduce the shock loads on the chain 7 during sudden stops of the mast, a damper device is provided, made in the form of a package of Belleville springs 23 (Fig. 8). Through the package of Belleville springs 23, the chain 7 pushes or pulls the upper section 8. Limit switches are provided to signal the mast extension to full height and the transport position of the mast sections. A full height mast extension limit switch is built into the magazine and operates on a protrusion located at the end of chain 7. The transport position limit switch for mast sections is attached to a first section or carrier object and operates on a second section 12 or payload.

To determine the lift height on the axis of the drive sprocket 4 there is a speed sensor, the signals from which the mast control unit converts into signals of readings for height.

In order to increase reliability, the shaft of the manual drive mechanism is additionally provided, with the help of which it is possible to extend or retract the mast sections in cases where it is not possible to use the electric motor of the geared motor.

In the lower flanges of the mast sections there are windows through which the chain 7 passes. The lower flanges of the mast sections with a fully deployed mast are distributed evenly along the length of the chain 7 and give it additional stability when the chain is elasticly bending from the effect of vertical load and the mast tilts. At the height of the mast sections, at which loss of chain stability is possible during elastic bending from the action of vertical load and the tilt of the mast to increase the stability of the chain 7, the supporting flanges 32 (Fig. 11) of the chain are installed, in which the clamps 24 (Fig. 9) are installed. The latch is a mechanism that has two working positions: the position of the suspension of the supporting flanges on the overlying section and the position of the stop of the supporting flanges on the underlying section. When the mast is raised, when the cam 27 reaches the stop 33 fixed on the mast section, the stop presses on the cam, which moves the slider 26 to a position at which the lock pin 28 is released and the supporting flange 32 is fixed on the stop 33 of the mast section. When lowering the mast when the pin 28 reaches the cam 27, the pin presses the pin on the cam, which moves the slide 26 into the hole of the pin of the pin, releasing the supporting flange 32 from the stop 33 of the mast section and fixing the supporting flange on the pin of the pin 28.

Each sliding section corresponds to its own set of sequentially located supporting flanges 32 connected by retainers 24 (Fig. 11). When the mast is raised, each section pulls with it a set of supporting flanges 32, which take their operating positions sequentially, starting from the bottom, at a specific location. When lowering the mast, the flanges take the transport position sequentially, starting from the top. The support flanges 32 are evenly spaced along the length of the mast sections with sufficient space to provide chain stability.

The proposed invention makes it possible to achieve the technical result and due to the sequential batch scheme of the extension of the mast sections, the requirements for the power characteristics of the electric drive of the extension of the mast sections are reduced.

Claims (2)

A telescopic mast with a batch extension of sections with a lifting mechanism based on a chain, containing a fixed first section and movable sections, which include locks and stops designed to grip and fix the movable sections, a gear motor, characterized in that the section extension mechanism is made on the base of the chain, the profile of the links of which is made with a locking pin at one end, preventing the chain from folding in one direction after its straightening, which ensures the transfer of force in two directions, while one end of the chain is attached to the lower flange of the upper pull-out section, its other end is placed in the store chain, fixed on the first section by means of a bracket, windows for the passage of the chain are made in the lower flanges of the movable sections, the lock is made in the form of a mechanism having two working positions, the cam of which is made with the possibility of contact with the stops located in the movable sections and with the possibility of transferring the flag from the position of the stop on one section to the floor the stop on another section is activated, a damper device is located at the end of the chain, which is a package of Belleville springs, limit switches are installed to signal the mast extension to full height and the transport position of the mast sections, while the limit switch for the mast extension to full height is built into the store, and the limit switch of the transport position of the mast sections is fixed on the first section or on the carrier object, the shaft of the manual drive mechanism is installed in the gear motor, and a speed sensor is located on the axis of the drive sprocket to determine the lift height. 2. Telescopic mast according to claim 1, characterized in that additional supporting flanges are fixed on the lower flanges of the sliding sections of the mast by means of built-in clamps, and the clamps are made in the form of mechanisms having two working positions, the cam of which is made with the possibility of contact with the stops located in movable sections, and with the possibility of transferring the side rail from the suspension position to one section to the position of the stop on the other section.

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