EA015742B1 - Lifting mechanism for lifting an electrical device and winding the cable thereof - Google Patents

Abstract

Claimed is a lifting mechanism for lifting an electrical device and winding the cable thereof, the mechanism comprising a rope drum 1 for the load-carrying rope and a cable drum 2 for the electrical cable. The rope drum 1 is fixedly mounted on a shaft 3 of the rope drum, while the cable drum 2 is fixedly mounted on a shaft 4 of the cable drum. The shaft 3 is rotationally mounted in a support 5 of the rope drum 1 and the shaft 4 is rotationally mounted in a support 6 of the cable drum 4. The shaft 3 comprises a shaft key 7 interacting with first overrunning clutch 8 mounted on the shaft 3. First tooth gear 9 is mounted on the overrunning clutch 8. The support 6 in turn comprises a stationary neck bush 11 on which second overrunning clutch 12 is rotationally mounted. The overrunning clutch 12 is coupled with a bearing 13. The neck bush 11 is concentrically mounted on the shaft 4 and second tooth gear 14 is mounted on the overrunning clutch 12. The tooth gears 9 and 14 mesh with each other. The tooth gear 14 is mounted so as its end surface comes into contact with end wall of the cable drum 2 through a friction disk 15. The friction disk 15 is fixed on the cable drum 2 by means of screws 16 and pressed against the tooth gear 14 by means of springs 17, arranged evenly and circumferentially on the friction disk 15 and screwed thereto by means of threaded studs 18. Such arrangement of the tooth gear 14 allows its sliding in relation to the friction disk and cable drum 2. Sliding of the friction disk 15 and changing over the overrunning clutches 8 and 12 from idle stroke to working stroke, provide constant tension and winding speed of the cable when lifting and lowering the electric device.

Description

The present invention relates to a lifting mechanism. More specifically, the present invention relates to a lifting mechanism for lifting an electric device with a cable winding of such a device.

The level of technology

Wired electrical devices are widely used in various fields of technology. For example, in nuclear power, wired video cameras are used to remotely monitor the fuel reloading processes of nuclear reactors. To expand the field of observation, these cameras automatically move in the vertical direction. One of the problems that arise during the vertical movement of such cameras, is the problem of maintaining the cable tension within the specified limits and preventing its sagging. A similar problem may occur in any other field of technology that uses wired electrical devices.

BR patent 6094463 describes a lifting mechanism for lifting an electric device that includes a cable drum for winding a load carrying cable rigidly fixed to the shaft of a cable drum, a cable drum for winding a cable of an electric device rigidly fixed on the cable drum shaft the shaft of the cable drum is mounted for rotation, and the cable drum supports, in which the shaft of the cable drum is rotatably mounted. In the specified device to maintain the tensioned state of the cable uses a separate drive that performs the rotation of the cable drum. The disadvantage of this mechanism is the need to install a separate drive to maintain the tensioned state of the cable and its synchronization with the cable drum drive, which in practice leads to an increase in the cost of the mechanism itself and the cost of its operation.

DISCLOSURE OF INVENTION

The present invention is to create a lifting mechanism for lifting an electrical device, in which there is no need to use a separate drive to maintain the tensioned state of the cable.

This problem is solved by creating a lifting mechanism for lifting the electric device, which includes a cable drum for winding a load-carrying rope rigidly mounted on the shaft of the cable drum, a cable drum for winding the cable of an electric device rigidly mounted on the shaft of the cable drum, the supports of the cable drum in which the shaft of the cable drum is mounted for rotation, and the cable drum supports, in which the shaft of the cable drum is rotatably mounted. The specified lifting mechanism is characterized in that the first wheel is mounted on the cable drum shaft, the cable drum support has a fixed axle, on which the second wheel is concentric with the cable drum shaft, the second wheel is installed in sliding friction with the cable drum, the first and second the wheels are mounted in cooperation with each other, the gear ratio of the first and second wheels is chosen so that the angular velocity of the second wheel is greater than the angular velocity of the cable drum, the first wheel is installed with the possibility of free rotation relative to the shaft of the cable drum when lowering the electric device and rigid engagement with the shaft of the cable drum when lifting the electric device, and the second wheel is installed with the possibility of free rotation relative to the stationary pin of the cable drum support when lifting the electric device and rigid engagement with the fixed pin of the cable drum support when lowering the electrical device.

The proposed lifting mechanism maintains the tensioned state of the cable through the use of two interacting wheels, which are mounted on the respective shafts with the possibility of free rotation relative to these shafts in only one direction and which have different rotation speeds. Such a mechanism has a lower initial cost compared to the closest analogue and requires lower operating costs. In addition, there is no need to synchronize additional links with the drive of the lifting mechanism.

According to another embodiment, said possibility of free rotation of the first wheel relative to the shaft of the cable drum and rigid engagement of said wheel with said shaft is ensured by using the first overrunning clutch and bearing installed between the first wheel and the shaft of the cable drum and the key mounted on the shaft of the cable drum with the possibility of interaction with the specified first overrunning clutch, the specified possibility of free rotation of the second wheel relative to the fixed bearing pin cable the second drum and rigid gearing with a fixed pin of the cable drum support is provided by using a second overrunning clutch, combined with a bearing, installed between the second wheel and a fixed pin of the cable drum support, and the specified friction interaction occurs through a friction disk mounted between the end surface of the second wheel and the end wall cable drum, by pressing the friction disk to the end wall of the cable drum by means of pressure.

According to another embodiment, the first and second wheels of the lifting mechanism are 1,015,742 yen in the form of gear wheels, and the interaction of such gear wheels is due to their direct engagement or is provided by means of a toothed belt connecting said gear wheels.

According to another implementation variant, the first and second wheels are made in the form of pulleys, and the lifting mechanism also includes a belt which bends around said pulleys.

According to another implementation variant, the specified gear ratio of the first and second wheels is selected from the condition of the ratio of their diameters, while the angular velocity of the second wheel when the lifting mechanism is operating is greater than the angular velocity of the cable drum by 5-10%. With such a ratio of angular velocities of the second gear wheel and the cable drum, an optimal leveling of the cable and rope speeds is ensured.

According to another implementation variant, said pressing means include springs evenly spaced around the central axis of the friction disk, and the friction disk is fixed on the cable drum using pins. This ensures that the friction disk is constantly pressed against the end wall of the cable drum.

According to another embodiment, an additional gear wheel is fixedly mounted on the cable drum to interact with the drive and actuate the lifting mechanism.

According to another implementation variant, the lifting mechanism is electrically driven.

Brief Description of the Drawings

The following describes a preferred embodiment of the proposed lifting mechanism with reference to the accompanying drawings, in which FIG. 1 shows a lifting mechanism according to a preferred embodiment;

FIG. 2 is a section taken along line A-A shown in FIG. one;

FIG. 3 is a kinematic diagram of a lifting mechanism according to a preferred embodiment.

The implementation of the invention

FIG. 1 and 2 show the proposed lifting mechanism according to a preferred embodiment of the present invention. FIG. 3 shows the kinematic diagram of such a lifting mechanism. The mechanism includes a cable drum 1 for winding a load carrying rope on which a lifted electrical device is fixed, and a cable drum 2 for winding a cable of said electric device. In this example, a video camera with pointing drives and lighting devices was used as an electrical device to remotely monitor the process of handling nuclear fuel. To expand the observation area, the specified video camera is automatically moved in the vertical direction. One of the problems that arise with the vertical movement of such cameras, is the problem of maintaining the cable tension and preventing its sagging. However, a similar problem may occur in any other field of technology where movable wired electrical devices are used. Thus, the invention can be used for raising and lowering any other movable electric device, for example: an electrically controlled lifting device, lifting devices with an electrically controlled suspension (for example, a turning hook), a sound recording, lighting device, etc.

The cable drum 1 is rigidly fixed on the shaft 3 of the cable drum, and the cable drum 2 is rigidly fixed on the cable drum shaft 4. Shafts 3 and 4 are rotatably mounted in the supports 5 of the cable drum and the supports 6 of the cable drum, respectively.

The shaft 3 additionally includes a key 7. On the shaft 3, in cooperation with the key 7, a first overrunning clutch 8 is installed, on which the first gear 9 is mounted. Thus, the gear 9 can rotate freely relative to the shaft 3 only when the electric device is lowered. Also, an additional gear wheel 10 is fixedly mounted on the shaft 3 to interact with the drive (not shown) of the mechanism.

In turn, the support 6 has a fixed axle 11, on which a second overrunning clutch 12 is mounted, rotatably mounted with a bearing 13. A trunnion 11 is mounted concentrically to the shaft 4, and a second gear wheel 14 is mounted on the overrunning clutch 12 free rotation of the gear 14 relative to the shaft 4 only when lifting the electric device.

Gears 9 and 14 are engaged with each other.

As can be seen from FIG. 2, the gear wheel 14 is mounted in cooperation on its end surface with the end wall of the drum 2 through the friction disk 15. The disk 15 is fixed on the drum 2 with pins 16 and pressed against the gear wheel 14 by springs 17 arranged evenly around the disk 15 on the threaded rods 18. The force of the springs, pressing the gear wheel 14, is chosen so that it is possible to slip relative to the disk 15 and, as a result, relative to the drum 2.

The proposed mechanism works as follows.

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The cable drum 1 is driven by a lifting device through a gear wheel 10. When the drum 1 rotates on the electric device, the shaft 3 through the overrunning clutch 8, which interacts with the key 7, is rigidly connected to the gear wheel 9 and rotates it. The rotation of the wheel 9 is transmitted to the wheel 14 and then through the friction disc 15 to the cable drum 2. The gear ratio of the wheels 9 and 14 is chosen so that the angular speed of the wheel 14 is 5-10% more than the angular speed of the drum 2 rotating with the lifting speed of the electric device therefore, the rotation of the gear wheel 14 is carried out with sliding relative to the drum 2. The springs 17 create the necessary force for tensioning the cable, which is many times less than the force from the electrical device being lifted.

When the drum 1 rotates in the opposite direction to lowering the electric device, the drum 2 will also rotate in the opposite direction by the tension of the cable, trying to turn the gear wheel 14 through the friction disk 15. The gear wheel 14, in turn, is rigidly fixed from turning by means of the overrunning clutch 12 on fixed pin 11, and fixes from the rotation of the gear wheel 9, which is in engagement. The shaft 3 rotates freely in the gear wheel 9 due to the free running of the overrunning clutch 8, ensuring unhindered lowering of the electrical device.

Thus, when sliding the friction disk 15 and switching overrunning clutches 8 and 12 from working to idle when lifting and lowering the electric device ensures constant tension and speed of the cable of such a device.

In conclusion, it should be noted that the above example is only a particular example of the implementation of the present invention. In particular, together with an electrical device, for example, supporting structures used to fix lifted electrical devices (for example, support frames or metalwork) and / or to ensure vertical movement of such devices (for example, guide shoes in conjunction with vertical guides) can be raised. The scope of legal protection requested in this application is defined by the following claims.

Claims (11)

1. A lifting mechanism for lifting an electrical device, which includes a cable drum for winding a load-carrying rope, rigidly mounted on a shaft of a cable drum, a cable drum for winding a cable of an electrical device, rigidly mounted on a shaft of a cable drum, cable drum supports in which it is rotatably mounted cable drum shaft, and cable drum supports, in which a cable drum shaft is mounted rotatably, characterized in that the cable drum shaft is installed the first wheel is mounted, the cable drum support has a fixed pin on which the second wheel is mounted concentrically to the cable drum shaft, the second wheel is mounted in friction with the cable drum to slide relative to it, the first and second wheels are mounted in cooperation with each other, the gear ratio of the first and the second wheels are selected so that the angular velocity of the second wheel is greater than the angular velocity of the cable drum, the first wheel is installed with the possibility of free the shaft relative to the cable drum shaft when lowering the electric device and hard engagement with the shaft of the cable drum when lifting the electric device, and the second wheel is installed with the possibility of free rotation relative to the fixed pin of the cable drum support when lifting the electric device and hard mesh with the fixed pin of the cable drum support when lowering electrical device. 2. The lifting mechanism according to claim 1, characterized in that the indicated possibility of free rotation of the first wheel relative to the shaft of the cable drum and the rigid engagement of the specified wheel with the specified shaft is provided by using the first overrunning clutch and bearing installed between the first wheel and the shaft of the cable drum and a key mounted on the shaft of the cable drum with the possibility of interaction with the specified first overrunning clutch, the indicated possibility of free rotation of the second wheel relative to the fixed axle The cable drum and rigid meshing with the fixed axle of the cable drum support is provided by using a second overrunning clutch combined with a bearing, which are installed between the second wheel and the fixed axle of the cable drum support, and this friction interaction is carried out through the friction disk installed between the end surface of the second wheel and the end wall of the cable drum, by pressing the friction disk to the end wall of the cable drum by means of pressing. 3. The lifting mechanism according to claim 2, characterized in that the first and second wheels are made in the form of gears. 4. The lifting mechanism according to claim 2, characterized in that the first and second wheels are made in the form of pulleys, and the lifting mechanism also includes a belt enveloping these pulleys. 5. The lifting mechanism according to claim 3, characterized in that the said interaction of the first and second gears is due to their engagement. - 3 015742 6. The lifting mechanism according to claim 3, characterized in that said interaction of the first and second gears is provided by means of a gear belt. 7. The lifting mechanism according to claim 1, characterized in that the gear ratio of the first and second wheels is selected from the condition of the ratio of their diameters, and the angular speed of the second wheel during operation of the lifting mechanism is greater than the angular speed of the cable drum by 5-10%. 8. The lifting mechanism according to claims 2-6, characterized in that the pressing means include springs evenly spaced around the central axis of the friction disk, and the friction disk is fixed to the cable drum using pins. 9. The lifting mechanism according to claims 1 to 7, characterized in that an additional link is installed on the cable drum motionless relative to it for interacting with the drive and actuating the lifting mechanism. 10. The lifting mechanism according to claim 9, characterized in that said additional link is made in the form of a gear wheel. 11. The lifting mechanism according to claims 1 to 7, 9, characterized in that it has an electric drive.