CS219329B2 - Three-position magnetic compass detector - Google Patents

Abstract

1375533 Motor vehicles SNAM PROGETTI SpA 16 Feb 1973 [17 Feb 1972] 7862/73 Heading B7H [Also in Divisions G3 H1 and H5] A vehicle suitable for introduction into and movement along a pipe-line and for carrying means for performing operations inside said pipe-line, e.g. X-ray apparatus 8, includes a D.C. electric motor 3 for driving the vehicle, a battery 6 to supply driving power to the motor 3, an internal combustion engine 24 driving an A.C. generator which charges the battery 6 (and also supplies the power for the X-ray apparatus 8), and electric control means including control circuitry connected to control the motor 3 and a receiving device 61 for initiating a controlling action of said circuitry in response to an appropriate control device (not shown) which is positioned outside the pipe-line during use of the vehicle and is not electroconductively connected to the receiving device 61. As described the vehicle includes a main part having chassis 1 which carries the motor 3 driving wheels 2, battery 6, control circuitry 5 X-ray apparatus 8 and a magnetically operated receiving device 61, and also includes a semitrailer part having a chassis 22 connected to the main part by a universal coupling 19. The chassis 22 carries the internal combustion engine 24, a governor 36 for the engine 24 and an A.C. generator 25 driven by the engine 24. The generator 25 also includes D.C. windings and can be used as a D.C. motor to start the engine 24 using power from the battery 6. The exhaust 28 from the engine 24 is discharged behind a diaphragm 30 carried by the vehicle and having a seal 31 which engages the pipe-line. The wheels 2, 4, 23 are of the type described in Specification 22227/72, and have rollers arranged around their peripheries which allow the vehicle to follow curves in the pipe-line. The receiving device 61 consists of a magnetically operated switching device which can be actuated by a magnet outside of the pipe-line, and is used to control the motor 3 and to operate the X-ray apparatus 8.

Description

Further, U.S. Pat. No. 3,162,738 discloses a magnetic field rotary switch comprising a permanent magnet pivotable about a central position that actuates a reed relay, wherein the permanent magnet and the reed relay are disposed between two non-magnetic plates housed in the housing, and into which magnetic and non-magnetic bolts interfere. Furthermore, a magnetic spherical compass is known which forms a switching device in which two permanent magnets freely rotatable in the compass rotate depending on a magnetic field which changes its direction with respect to the compass, in particular on the magnetic field of the earth, and it sends control signals at a certain position relative to the compass housing. A similar device is known from U.S. Pat. No. 2,524,340.

All these devices have the disadvantage that the operator is exposed to the radiation of the radioactive source for a long period of time.

The aforementioned drawbacks of the known devices are overcome by a three-position magnetic compass detector, especially for use on a trolley with a device for checking welds from within the pipeline according to the invention, which consists of a permanent magnet embedded in a float soaked in kerosene. sealed by two non-magnetic lids, clamped by three bolts, two bolts being hemagnetic and a third bolt of soft iron, the lids having bushes in their center, in which the ends of the vertical continuous shaft are located,

3 '. which is provided with a float and on which a stop plate is provided in the upper part and on its sides there is one stop pin on the underside of the upper lid, and are further arranged outside the circumference of the float between non-magnetic bolts , two magnetic relays, such as vacuum switches.

The three-position magnetic compass detector according to the invention is used in a control device for stopping a trolley for radiological x-ray screening and inspection of welds in self-propelled piping, where instead of using radioactive sources together with a Geiger-Müller detector connected to an electronic programmer - except that it does not need any energy from energy. by eliminating the need for hazardous radioactive sources, it also allows the truck to reverse and disconnect the electronic equipment and the truck's power unit for longer breaks, such as at night.

Thus, said control device consists essentially of a permanent horseshoe magnet or an electromagnet arranged in an exemplary application transversely above the conduit such that its magnetic field, the polarity of which can be reversed. by rotating the magnet 180 °, it could act inside the pipeline on a three-position magnetic compass detector located on the carriage, i.e. by rotating the aforementioned. a magnetic compass which, without the magnetic field, is always oriented along the pipe, turning right or left to turn one on. or the other of the two magnetic relays associated with the electronic programmer logic circuits.

In the drawing, a three-position magnetic compass detector 61 consisting of a permanent magnet 62 inserted into a cylindrical float soaked in kerosene is shown as a normal magnetic compass. The whole is contained in a box 64 of non-magnetic material, sealed by two non-magnetic lids 65 and 66, clamped by three bolts, two of which are 67, 68 and 68 non-magnetic and the third 69 is soft iron.

This soft iron bolt 69 is intended to generate a magnetic opposite torque which will force the magnet 62 to engage. absence. an external magnetic field to always assume the orientation in the direction of the m-m axis through said bolt. In order to prevent the float from moving in the receptacle and only allow it to rotate, a small continuous float shaft 70 is inserted into the bushes 71 housed in the lids 65 and 66 with its ends. The plate 72 integrally with the small shaft 70 cooperates with two stepped pins 73 and 74 to limit the angular movements to the right and left of the float 63, and hence the small magnetic compass 62. In this way, it is possible to define three precise positions of the small magnetic compass 62. one represents the center or zero position in which the magnet is oriented along the m-axis and the other. two small magnet positions to the right and left.

In connection with these last two positions of the small magnet, two magnetic relays 75 and 76 are arranged between the two lids 65 and 66, which are excited by the small magnet 62 only when it is opposite the relay and is positioned in one of the two extreme positions. In addition, the magnetic relays are connected to the electronic programmer's logic circuits, which, using systems known in the art, can supply different control signals to the truck and therefore control the various different sequential operations described above. The detector 61 is positioned, in an exemplary application, on the trolley such that the aforementioned m-m axis coincides with the axis of the pipe to be radiated, so that the small magnet 62 is always oriented in the direction the trolley advances, in the absence of external magnetic fields.

The mode of operation of this detector is obvious. Adjusting the horseshoe-like permanent magnet across the duct, in the desired position, creates a scattered magnetic field 77 within the duct, the direction of which is oriented across the duct and, therefore, perpendicular to the direction of the above m-m axis.

As a result of this field, the small magnet 62 will have to rotate from its zero position to the right side where it will excite the magnetic relay 75.

If said horseshoe permanent magnet is rotated 180 °, the polarity of its scattering-magnetic field 77 is reversed and the small magnet 62 is rotated to the left and excites the magnetic relay 76. In summary, the external magnet 62 actuates the electric relay 75 or a magnetic relay 76 and provides a sequence of commands for the truck.

In practice, the above sequence of operations is as follows:

Adjusting the horseshoe permanent magnet to a predetermined pipe point so that its scattering magnetic field rotates the small magnet 62 to the right, the detector reaching that point due to the movement of the truck inside the duct, energizes the magnetic relay 75 to stop the truck and prepare the X-ray exposure phase. .

Upon removal of the horseshoe-permanent pipe magnet, the small magnet 62 returns to the zero position, the relay 75 energizes again, and X-ray exposure occurs.

By resetting the magnet in the same way as before, the cycle repeats and the X-ray exposure phase again.

By adjusting the horseshoe permanent magnet on the pipe to the opposite position, i.e. opposite to the above (180 ° rotation), the detector energizes a magnetic relay 76 which stops the carriage and causes a retraction.

By removing the magnet, the small magnet 62 returns to the zero position, the relay 76 energizes again, and the carriage retracts.

If the permanent magnet is placed again in the inverted position, the magnetic relay 76 energizes and stops the truck and disconnects the electronic device from the power unit.

Removing the magnet will turn the entire truck off for long breaks, such as at night. If the permanent magnet is placed in the inverted position again, the magnetic relay 76 is re-energized, causing the carriage to move forward.

Obviously, the above-described sequence of operations is not limiting to the scope of use of the detector and can be used for any sequence of operations since the effect of the invention is the simplicity and rational way by which a double-magnetic check, i.e. right-left, is realized. By way of example, the truck has a plurality of operating commands.

Claims (1)

SUBJECT OF THE INVENTION A three-position magnetic compass detector, in particular for use on a trolley with a device for checking welds from inside the pipeline, characterized in that it consists of a permanent magnet (62) inserted in a float (63) soaked in kerosene stored in a non-magnetic box (64). material sealed by two non-magnetic lids (65, 66), clamped by three studs (67, 68, 69), two studs (67, 68) being non-magnetic and a third stud (69) being of soft iron, the lids ( 65, 66) there are housings (71) in their centers, in which the ends of the vertical continuous shaft (70), which are provided with the float (63), and on which the stop plate (72) is provided on both sides of the upper cover (65) is located one stop pin (73, 74) and are further arranged between the two covers (65, 66) outside the circumference of the float (63); two magnetic relays (75, 76), for example vacuum switches.