RU21393U1 - MULTI LIFTING MECHANISM - Google Patents

Description

Mehang hoist hoist

The utility model relates to hoisting-and-transport equipment, namely, to hoist hoisting mechanisms.

As practice has shown, the operation of manual one-frame cranes with hoists, the most difficult operation is to raise and lower loads exceeding a weight of 5 tons. When working with such scales, a pulling force of up to 75 kgf is created on the hoist chain (according to the passport for the hoist), which requires great physical effort (up to 3 people).

The hoist lifting mechanism is known (see passport of a crane for a bridge manual supporting one-beam 0041B, USSR Ministry of Heavy and Transport Engineering VPO SOYUZODYEMTRANSMASH Krasnogvardeisky crane plant, 01.29.87), containing a traction wheel, driven by a chain, which is supplied with force. The pulling wheel is rigidly fixed to the worm shaft, transmitting the rotor to the worm wheel, rigidly connected to the chain sprocket g). During rotation, the worm wheel and sprocket transmit movement to the load chain and hook suspension.

The disadvantages of the known hoist lifting mechanism are:

- insufficient reliability during its operation;

-low labor productivity when working with maximum and - minimum loads.

Known hoist lifting mechanism, comprising a gearbox and a drive mechanism, including a gear shift lever and a traction wheel (see AS USSR No. 160292 M ka 66D 3/12 publ. 16.01.64).

In the known hoist hoist mechanism, the rotation of the drive mechanism is transmitted to a gearbox consisting of a gear transmission, which comprises a gear ring connected to a wheel crown rigidly mounted on

7 μl H 66 D 3/12

movement of the working body hoists. The drive mechanism can operate in two modes: with the drive mechanism turned on and off

The disadvantages of the known hoist lifting mechanism are its low reliability during operation, the inability to operate in explosive conditions and low labor productivity when working with maximum and minimum loads.

The technical result obtained by using the proposed technical solution:

-increase reliability during its operation,

-the ability to work in explosive atmospheres,

-increase in labor productivity when working in the modes: (1 mode - at maximum load and 2 mode at minimum load).

The technical result is achieved as follows: In the hoist lifting mechanism, it contains 1; it has a gearbox and a drive mechanism including a gear lever and a traction wheel, the gearbox is made in the form of two-crown gear blocks: movable and stationary, each of which contains a large and small crowns installed with the ability to interact with other drzlg, while the fixed two-gear block of gears is mounted on the worm shaft of the hoist, and the movable two-crown block of gears is mounted on the shaft of the traction wheel, and the mechanism The drive also contains a ratchet wheel, an eccentric shaft and a speed shift fork, while the ratchet, which is rotationally driven by the speed shift lever, is rigidly mounted on the cam shaft, on which the speed switch is mounted with the possibility of translational movement along the direction and is connected with a movable two-gear block of gears.

,

In Fig. 1, the proposed hoist lifting mechanism is shown schematically, in Fig. 2, a section along A - A, where:

1 - Tal manual mobile worm,

2-gear

3-draw wheel

4- Chain

5- Fall (cable)

6- Gear housing

7- Gear shift ring

8- Cam eccentric

9- Shift fork

10- Guide

11- Fixed two-gear block of gears

12- Key 13-Shaft

14- Grand Crown

15-key

16- Fixed two-gear block of gears

17-Malyvenets 18-Big crown

19- Worm shaft hoist

20- Bearing

21-key

22- Small Crown

23- Return spring

24- Dog

25- Ratchet Wheel

A gearbox 2 and a traction wheel 3, which is driven by a chain 4, are mounted on the hoist body 1 of a hand-held mobile worm gear. The halyard 5 is attached to the gear lever

. in the gear case 2, a movable 11 and a fixed 16 two-gear gear blocks are installed, the latter being mounted on a shaft 13, on which a traction wheel 3 is mounted on a pryut 12. Guides 10 are fixedly mounted on the gear case 2, along which the shift fork 9 is connected, connected with an eccentric shaft 8. The movement on the eccentric shaft 8 is transmitted using a ratchet wheel 25, which is influenced by a dog 24 connected to the gear lever 7. Movable 11 and fixed 16 two-crown gear units interacting with each other by two large 14 and 18 and two small rims 17 and 22. The fixed 16 two-gear block of gears is mounted on the worm shaft 19 of the hoist with the help of the pin 15. The shaft 13 is mounted in the bearings 20, and the movement along the shaft 13 of the movable 11 of the two-gear block of gears is carried out along the keys 21. The dog 24 is pressed by means of a return spring 23 to the ratchet wheel 25.

The proposed hoist lifting mechanism operates in 2 modes (when working with maximum -1 mode and minimum -2 mode loads) as follows:

Mode 1 (when working with maximum loads) The eccentric shaft 8 is set so that the speed shift fork 9 on the guide 10 is in the extreme right position. Due to the force on the halyard 5, the speed change lever 7 through the dog 24 presses the ratchet wheel 25, which is rigidly connected to the eccentric shaft 8, and rotates it. After releasing the halyard 5, the shift lever 7 due to the return spring 23 takes its original position. When the eccentric shaft 8 is rotated, the force is transmitted to the speed switching fork 9, and it, in turn, moving along the guide 10, performs a translational movement in the direction of the arrow. Result // C 9ff f

whereby the small crown 22 of the movable 11 two-gear block of gears engages with the large crown 18 of the fixed 16 of the two-gear block of gears of the hoist worm shaft 19. Chain 4 creates a force on the traction wheel 3, which is transmitted to the shaft 13 through the key 21. Next, this force is transmitted to the movable 11 two-gear block of gears and then through the key 15 to the hoist worm shaft 19. Due to the difference in the gear ratio of the small thing 22 of the movable 11 two-gear block of gears and the large crown 18 of the stationary 16 two-gear block of gears, the force circuit 4 is reduced by 3 times. Mode 2 (when working with minimal loads)

Due to the repeated effort on the halyard 5 by the speed switching lever 7 through the dog 24 to the ratchet wheel 25, the eccentric shaft 8 is further rotated, which transfers the force to the speed switching fork 9, as a result of which the speed switching fork 9, moving along the guide 10, performs translational motion along arrow B and set so that the shift fork 9 is in the extreme left position. We create a force with the help of chain 4 on the traction wheel 3. The force is transmitted to the shaft 13 of the traction wheel 3 through the broom 21. The shaft 13 is equipped with a movable 11 two-gear block of gears, a large crown 14 of which engages with a small crown 17 of a fixed 16 two-crown block gears, which is mounted on the worm shaft of the hoist 19. As a result of the changed gear ratio, the lifting speed of the load increases by 2 times

The proposed hoist hoist compared to the known

- more reliable in operation

-allows operation in explosive atmospheres

-allows you to increase productivity when working in the modes: 1 mode - at maximum load, 2 mode - at minimum load.

when working with maximum loads (1 operating mode), the work force is released, because in the known hoist lifting mechanism, 2 3 people are used, and in the proposed technical solution, 1 person performs this work, because the force on the chain is reduced by 3 times ..

When working with minimal loads (2 operating modes), labor productivity is achieved by 2 times due to the reduction of operations for lifting and lowering loads.

When using the application, you must contact the authors.

Claims (1)

A hoist lifting mechanism, comprising a gearbox and a drive mechanism, including a gear shift lever and a traction wheel, characterized in that the gearbox is made in the form of two-crown gear blocks: movable and stationary, each of which contains a large and a small crown mounted for interaction with each other while the fixed two-gear block of gears is mounted on the hoist worm shaft, and the movable two-crown block of gears is mounted on the shaft of the traction wheel, and the drive mechanism further comprises snoring e wheel, eccentric shaft, guides and a speed shift fork, while the ratchet wheel, driven into rotation by the speed shift lever, is rigidly mounted on the eccentric shaft, on which a speed shift fork is mounted with the possibility of translational movement along the guides and is connected with a movable two-gear block of gears .