RU157403U1 - AUTOMATIC DRILL KEY TORQUE ASSEMBLY - Google Patents

Abstract

The torque control unit of an automatic drill key, including an L-shaped lever with a measuring bar for the possibility of interaction with the pneumatic drive of the drill key through the valves, a mobile stop of the drill key with the possibility of transmitting force from the pneumatic drive of the drill key to the movable stop through the L-shaped lever, and also including a measuring element with a strain gauge sensor, characterized in that the measuring element is formed by a housing and an elastic membrane with at least one with a strain gauge sensor, and the unit also includes a pressure sensor for determining the included transmission of the pneumatic drive of the drill key, electric communication cables, an electronic board for processing the data of strain gauges, generating a signal for the key drive control system, a calibration data storage device, the measuring element being mounted on a mobile emphasis of the drill key in such a way that it interacts with an elastic membrane with an L-shaped lever.

Description

The utility model relates to downhole equipment and can be used as part of drilling rigs. When drilling oil and gas wells, it is necessary to control the magnitude of the torque of screwing the pipes when building the drill string to avoid its breakage during drilling.

From patent No. 2353749 RU a stationary drill key is known, comprising a housing, upper and lower pipe clamping devices, a driving motor (hydraulic motor), gearbox, torque meter, braking device, support column, remote control located therein. The torque meter includes a hydraulic cylinder installed between the gearbox housing and the key housing with the ability to balance the reactive force from the gearbox housing when tightening and tightening the joints with the hydraulic pressure in the internal cavity of the hydraulic cylinder, a manometer measuring the pressure in the hydraulic cylinder, and an automatic unloading valve.

There is a known mechanical system for shutting off the air supply to the pneumatic drive of automatic drill keys of the AKB-4 models (resource http://www.alnas.ru/products/klyuch-burovoy) when the maximum torque value set on the mobile stop is exceeded. The specified technical solution solves the problem of torque control not completely, because serves only to shut off the drive when exceeding the specified maximum torque on the keys of the battery. The amount of torque during the tightening process is not controlled. In addition, during the operation of the key, the factory settings are lost, and this causes uncertainty when the key drive is disconnected. Restore settings can only be on a special stand in the factory.

From patent No. 1834351 SU, a stationary drill key is known that contains a locking mechanism with a carriage mounted on a power column, a screw-unscrew mechanism, and also a torque response unit, which is made in the form of a two-way force-measuring hydraulic sensor or a two-way strain gauge and placed on the telescopic swinging support of the drill key. Moreover, an automated system based on sensor measurements limits the torque of the drive motor. The specified technical solution requires significant changes in the design of the drill key: the introduction of a hydraulic cylinder, additional brackets, hoses and mechanical improvements for the installation of sensors. The measurement in this solution is indirect, since it determines the magnitude of the force transmitted from the pneumatic actuator to the movable stop by calculation through pressure measurement, and not the force of the key developed by the pneumatic actuator. This reduces the accuracy of the measurement.

The closest analogue is the automatic stationary drill key known from Patent No. RU 2188297, which comprises a housing, upper and lower pipe clamping devices mounted therein, a gearbox, a drive motor and a torque meter. The key moment meter has a lever mechanism, a movable stop for adjusting the torque and a valve system to automatically turn off the drive motor after reaching the set make-up torque. The mobile stop is mounted on the planetary gear cover and rotates together with the planetary gear housing. All other components of the momentmeter are placed on the bracket of the gearbox housing motionless. When the set torque is reached, the lever under the action of the reactive force of the mobile stop rotates, overcoming the force of the lever valve spring, and opens this valve. The pressure through the lever valve is supplied to the shut-off valve, which closes and shuts off the air supply to the drive motor.

The described momentometer is a complex device, which reduces its reliability and increases the cost of production. In addition, it is advisable to produce torque control units removable, and providing the ability to install various types of wrenches.

The objective is to provide torque control when making up pipes with automatic drill keys.

The problem is solved due to the design of the torque control unit, which includes a measuring element based on an elastic membrane with at least one strain gauge sensor placed on it, a pressure sensor for determining the included transmission of the drill key pneumatic drive, electrical communication cables, an electronic processing board strain gauge sensor data, signal generation for a key drive control system, calibration data storage device. Moreover, the measuring element is mounted on a movable stop of the drill key in such a way that it interacts with an elastic membrane with an L-shaped lever.

As a result, the unit directly measures the torque developed by the drill key drive, generates control signals for the drive in real time. Efficiency and low cost of mounting the torque control unit are also achieved.

Utility Model Implementation

The torque control unit consists of

1. A measuring element with fastening elements on a mobile emphasis of an automatic drill key;

2. A pressure sensor for determining the engaged gear in the key pneumatic drive;

3. Electric communication cables;

4. An electronic board for processing data of strain gauge sensors, generating a signal for a key drive control system, as well as a calibration data storage device.

The measuring element includes a housing and an elastic membrane with at least one strain gauge placed on it.

The body of the measuring element is mounted on a movable stop of the automatic drill key between the stop and the L-shaped lever, and the L-shaped lever interacts with the membrane of the measuring element.

The measuring element is installed instead of the standard stop, while maintaining the factory torque limit adjustment system by mechanically setting the maximum torque on the measuring bar on the L-shaped lever.

The torque control unit operates as follows: the force from the pneumatic key drive through the rack of the mobile stop is transmitted to the measuring element. That, in turn, presses on the L-shaped lever to turn on the mobile valve and the shut-off valve. Thus, the measuring element plays the role of a regular stop of the drill key, while simultaneously making a direct measurement of the force developed by the pneumatic actuator key. Further, the measured value in the electronic part of the measuring element, taking into account the length of the arm, is converted into a torque value and is transmitted in a standard 4-20 mA current signal via a communication cable. The force from the L-shaped lever is transmitted to the elastic membrane of the measuring element, bending it by a value proportional to the magnitude of this force. Strain gauges of non-electric quantities on an elastic membrane give an electrical signal proportional to the magnitude of its deflection.

The electronic board processes the signal from strain gauge transducers of non-electrical quantities in accordance with the calibration data entered into the storage device of the measuring element during calibration on a special stand, as well as in accordance with the data of the pressure switch of the pneumatic actuator key.

Power supply of elements in the SCM through an electric communication cable.

Description of drawings

Figure 1 shows a part of an automatic drill key with a torque control unit located on it. 1 - mobile stop 2 - measuring element, 3 - pressure sensor, 4 - communication cable, 5 - adjustment screw, 6 - lever, 7 - mobile valve, 8 - shut-off valve.

Claims (1)

The torque control unit of an automatic drill key, including an L-shaped lever with a measuring bar for the possibility of interaction with the pneumatic drive of the drill key through the valves, a mobile stop of the drill key with the possibility of transmitting force from the pneumatic drive of the drill key to the movable stop through the L-shaped lever, and also including a measuring element with a strain gauge sensor, characterized in that the measuring element is formed by a housing and an elastic membrane with at least one with a strain gauge sensor, and the unit also includes a pressure sensor for determining the included transmission of the pneumatic drive of the drill key, electric communication cables, an electronic board for processing the data of strain gauges, generating a signal for the key drive control system, a calibration data storage device, the measuring element being mounted on a mobile emphasis of the drill key in such a way that it interacts with an elastic membrane with an L-shaped lever.

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