RU2447473C1 - Device for emergency folding of pressure arm - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: device has a normally open relay and a control circuit. The device is made by augmenting an existing circuit with three diodes and a normally open protective relay, where the second input of the device is connected through a first forward biased diode to the first input of the control circuit and through the winding of the second relay to the housing. The first and second inputs of the device are connected through reserved biased second and third diodes to the input of the contact group of the second relay, the output of which is the output of the device.

EFFECT: invention enables folding of a pressure arm during failure of the control circuit of the device and one cable core, which almost doubles reliability compared to existing devices.

2 dwg

Description

The invention relates to techniques for field geophysical research of wells, in particular to a method of vertical seismic profiling (VSP).

In the process of VSP work, the receiving modules of the probe are pressed most of the time to the wall of the well. Failure of the cable core or the electronic circuit of the device under such conditions leads to a complex accident associated with the loss of freedom of probe movement along the wellbore. This stimulates the search for technical solutions to increase the reliability of the operation of folding the clamping levers in the modules and restore the mobility of the probe.

A device is known for controlling the engine of the power drive mechanism of the receiving module of the equipment TsSK-18 (see figure 2) (Passport of the digital seismic complex TsSK-18 NMGSK 5.02.000.00 PS, graphic applications: 20, 22, 24, Murmansk, NIIIMorgeofizika - service com ", 2004). At the first input of the device along the cable conductor, control commands and power supply for the motor are received, and the second input of the device through the other cable conductor receives power supply of positive polarity for the electronic circuit of the device.

The known device contains a relay with normally open contacts (HP) and a control circuit, the first input of the control circuit, which is the second input of the device, is connected with its output through the relay coil, the second input of the control circuit is connected with the first input of the device and the input of the relay contact group, the output of which is the output of the device.

The steps for opening and folding the clamping lever in the known device are made using the same circuits and commands and differ only in the polarity of the motor voltage. That is, they are performed with the same reliability. This is a significant disadvantage of the known device. After all, the consequences of equipment failure during the operation of folding the lever are much more dangerous than the consequences of failure when opening the lever.

The purpose of the proposed device is to increase the reliability of the operation of folding the clamping lever in the event of an emergency.

It is achieved by the fact that in the device for emergency folding of the pressure lever containing the first relay with normally open contacts and a control circuit, the first input of which is connected to its output through the winding of the first relay, the second input of the control circuit is connected with the first input of the device and the input of the contact group of the first relay, and the contact group output of the first relay is the output of the device, three diodes and a second relay with normally closed contacts are additionally introduced, and the second input of the device through the first diode located directly connected, it is connected to the first input of the control circuit and through the winding of the second relay with the housing, and the first and second inputs of the device through the back-connected second and third diodes are connected to the input of the contact group of the second relay, the output of which is connected to the output of the device.

Functional diagram of the proposed device is shown in figure 1.

The device (Fig. 1) contains known elements: relay 1 (first relay) with HP contacts, control circuit 3 and new elements: protective relay 2 (second relay) with normally closed (NC) contacts, three diodes 4, 5, 6.

When the cable and the device are in good condition, the position of the clamping lever changes as follows: the supply voltage (+ Upr) of positive polarity from the second input of the device (Bx.2) through the diode 6 is supplied to the power input (first input) of the control circuit 3 and the winding of the protective relay 2. Relay 2 is activated and its NC contacts open. From the ground control panel to the input of the reception of commands (second input) of the control circuit 3 through the first input (input 1) of the device receives a command to turn on the engine. The control circuit 3 recognizes the specified command and connects the winding of relay 1 to the housing with its output. As a result, relay 1 is activated, its contacts are closed and connect the first input of the device to the motor. The lever opens when a positive voltage (+ Udv) is applied to the input 1 of the device, and folding when a negative voltage (-Udv) is applied.

If the control circuit 3 fails, the contacts of relay 1 remain open and voltage to the motor is not supplied through them. In such conditions, for emergency folding of the clamping lever, it is necessary to remove the positive voltage (+ Upr) from the second input of the device. In this case, the protective relay 2 will return to its original state, its contacts will be closed, thereby providing a negative voltage supply (-Udv) along two circuits: 1 - Input 1, diode 4; 2 - Input 2, diode 5. As a result, the lever will fold and the device will be squeezed from the well wall. In this case, the diode 6 prevents the entry of undesirable negative voltage to the input of the control circuit 3. In the event of a failure of one of the cable cores, negative voltage is supplied to the motor through the remaining serviceable core.

These examples show that a slight complication of the receiver module circuit allows the operation of folding the clamping lever with a large number of equipment failures. Compared with the known device, the reliability of its execution is approximately doubled.

Claims (1)

A device for emergency folding of the clamping lever, comprising a first relay with normally open contacts and a control circuit, the first input of which is connected to its output through the winding of the first relay, the second input of the control circuit is connected to the first input of the device and the contact group input of the first relay, and the contact group output the first relay is the output of the device, characterized in that it additionally includes three diodes and a second relay with normally closed contacts, and the second input of the device through the first diode, finding Directly connected, it is connected to the first input of the control circuit and through the winding of the second relay with the housing, and the first and second inputs of the device are connected through the reverse connected second and third diodes to the input of the contact group of the second relay, the output of which is connected to the output of the device.

Images