RU18421U1 - LIFTING LIFT - Google Patents

Description

2001107209

i etiuJ () MILK E 2 1 B 47/00

LIFTING LIFT

Ueyagoi.sug (bc refers to field geophysics and can be used to lower and raise downhole tools.

Known logging elevator containing a frame, on one part of which the operator’s cabin is located, and on the other - a hydraulic winch, cable stacker with hydraulic cylinder and brake 1.

A disadvantage of the known device is the complexity of the drive, containing a hydraulic pump and a hydraulic motor with variable performance, as well as the low accuracy of regulating the speed of descent and ascent of a downhole tool.

The closest to the claimed design and achieved results is a logging hoist containing a variable displacement hydraulic pump connected to a drive motor and a hydraulic motor connected to the winch drum, a power amplifier connected to a stepper motor connected through a gearbox to a rotary hydraulic pump housing, a cable with downhole tools wound on a winch drum and control panel 2.

The disadvantages of this device are its complexity and insufficient smoothness and discrete (step) nature of the regulation of the speed of the cable.

The task at hand is to simplify the device, increase smoothness and the continuous (stepless) nature of the change in the movement of the wireline cable.

The problem is solved in that in a logging elevator containing a winch drum with a logging cable wound downhole with a downhole tool, a drive with a device for controlling the speed of rotation of the winch drum with a hydraulic pump, a control panel, a device for controlling the speed of rotation of the winch drum is made in the form of two planetary mechanisms, the input central gears of which are connected to each other and to the drive input shaft by a bevel gear, the output central gears are connected to a hydraulic by pumps, the inlet and outlet nozzles of each of which are filled with a working fluid and closed through an adjustable throttle device, while the adjustable throttle devices are connected to the servomotor via a communication line, and the planetary gear carriers are connected via gear wheels to a driven shaft and a chain sprocket transmitting rotation on the drum winch.

1- winch drum;

2- planetary mechanisms;

3- central input gears of planetary gears;

4- bevel gear;

5- leading input shaft;

6 - output central gears;

7 gear wheels;

8- driven shaft of the drum rotation speed control device;

9-chain drive sprocket;

10 - hydraulic pumps with nozzles filled with a working fluid;

11- adjustable throttle devices;

12 - servomotor;

13- chain;

14- winch drum sprocket.

The winch-1 drum through the sprockets 14 and 9 and the chain 13 is connected to the driven shaft 8 of the rotation speed control device comprising planetary gears 2 connected by a bevel gear 4 to the drive shaft 5.

The input gears 3 of the planetary gears 2 are connected to the bevel gears of the gear transmission 4. The output gears 6 of the planetary gears 2 are connected to hydraulic pumps 10, the input and output nozzles of which are filled with a working fluid (for example, oil) and are connected to adjustable throttle devices 11. Chokes 11 of both pumps are mechanically interconnected and connected to the servomotor 12 through a communication line. The satellite carriers of both planetary mechanisms 2 are connected by gears 7 to the driven shaft 8 of the winch drum rotation speed control device.

The device operates as follows.

At the initial moment of time, the adjustable throttle device 11 is open, and the drive shaft 5, through the bevel gear 4, rotates the input central gears 3 of the planetary gears 2. At the same time, their rotation is transmitted to the shafts of the hydraulic pumps 10, which pump the working fluid through a closed pipeline through open chokes 11, not experiencing any resistance. At this moment, the driven shaft 8 of the winch drum speed control device 1 does not receive rotation from the chain drive.

close the adjustable throttle device 11, blocking the fluid flow in one of the hydraulic pumps 10. Then, a braking torque appears on the shaft of the hydraulic pump 10, and with it on the shaft of the corresponding output gear 6, slowing down the speed of its rotation. Then the carrier of this planetary mechanism 2 begins to rotate, the rotation is transmitted to the driven shaft 8, sprocket 9 and through the chain 13 and sprocket 14 to the winch drum 1. As the controlled throttle device 11 closes, the rotation speed of the winch drum 1 increases, and when the managed throttle device 11 is completely closed the rotation speed of the winch drum 1 reaches its maximum value, because the corresponding hydraulic pump stops the corresponding output central gear 6 and the gear ratio of the planetary gear becomes minimal (direct transmission). Thus, by throttling the fluid flow through the hydraulic pump, the gear ratio of the winch drum speed control device is continuously controlled.

To change the direction of rotation of the winch drum 1, it is enough to open the throttle 11 described above and start closing the throttle of the opposite hydraulic pump 10. Moreover, the rotation speed of the winch drum 1 is proportional to the resistance of the fluid flow in the pump circuit, i.e. hydraulic pumps are used for a new purpose - as a brake device.

The effectiveness of the proposed device is due to the fact that with a fairly simple design, it has the ability to smoothly control speed and reverse without disengaging the kinematic chain.

Compared with known devices of a similar purpose, the proposed technical solution has the following advantages:

- high reliability due to the simplicity of the design;

increased range of stepless speed control of the winch drum.

Sources of information

1. Author's certificate No. 1596096, Е 21 В 47/00, БИ No. 36, 1990.

2. Copyright certificate No. 1654557, Е 21 В 47/00, BI No. 21, 1991.

Claims (1)

A logging hoist containing a winch drum with a cable wound on it with downhole tools, a drive with a device for controlling the speed of rotation of the winch drum with a hydraulic pump, control bullets, characterized in that the device for controlling the speed of rotation of the winch drum is made in the form of two planetary mechanisms, the input central gears of which connected to each other and to the input shaft by a bevel gear, output central gears connected to hydraulic pumps, input and output each branch pipe is filled with a working fluid and closed through an adjustable throttle device, while the adjustable throttle devices are connected to the servomotor via a communication line, and the planetary gear carriers are connected via gear wheels to the driven shaft and the chain sprocket transmitting rotation to the winch drum.