RU37425U1 - POSITION SIGNALING UNIT - Google Patents

Description

The utility model relates to electrical engineering, in particular, to explosion-proof position signaling units and can be used for installation in electric actuators with the aim of converting the position of the output organ of the electric actuator to a proportional electric signal and (or) blocking in the extreme or intermediate positions of the output body.

A known position signaling unit, a housing with a microswitch unit located therein, a sensor assembly with a resistive element, an input device, an output shaft position indicator, the current-carrying parts of the block are enclosed in a flameproof enclosure, and the input device allows rotation by a multiple of 90 ° in its plane joints with housing 1.

The disadvantage of this position signaling unit is the limited distance (up to 100 m), to which a proportional electric signal can be transmitted when using a sensor with a rheostat element for converting the angular position of the output shaft, as well as the need to use a remote normalizing converter located outside the explosive zone.

The proposed utility model solves the problem of increasing the transmission distance of the proportional electrical signal from the position signaling unit to the control cabinet, where the position of the output organ of the mechanism is adjusted, up to three kilometers.

To achieve this technical result, a position signaling unit, a housing with a microswitch unit housed in it, a sensor assembly with a resistive element, an input device, an output shaft position indicator, the current-carrying parts of the unit are enclosed in a flameproof enclosure, and the input device can be rotated through an angle of 1 90 in the plane of its articulation with the housing, a normalizing converter is additionally introduced, electrically connected to the rheostat element.

A distinctive feature of the proposed position signaling unit is the placement in it of a normal chreobrazovatel, which serves to convert the ohmic signal from the rheostat element into the current.

This arrangement of the normalizing converter directly at the place of conversion of the ohmic signal into a uniform current 4-20 (0-20) or 0-5 mA can significantly reduce distortion in the transmitted signal to the control board, where the position of the output organ of the mechanism is regulated, compared with the situation of the prototype when the electric signal, u), which is optional to the ohmic resistance, was transmitted to the location of the regulation source and there it was converted into a current one.

This allows you to adjust the position of the output organ of the mechanism located in the hazardous area from a distance of three kilometers from the location of the control cabinet of the mechanism and at the same time indicate the position of the output organ on the operator’s console.

The proposed position signaling unit is illustrated by the drawings shown in FIG. L-6.

In FIG. 1 shows a general view of the position signaling unit, FIG. 2 is a view A, in FIG. 3 is a section B-B in FIG. 2, in FIG. 4 is a microswitch unit with a normalizing converter, in FIG. 5 - section bb in figure 4, figure 6 - section gg in figure 4.

The cm Hajnoa ffl position block contains a housing 1, in which a microswitch block 2, a sensor assembly with a resistor element 3, and a normalizing transducer 4, an input device 5 for inputting an external cable, the ends of the wires of which are attached to the conductive flanges 6, terminal block 7, are placed covers 8 and 9, covering the housing 1 and the input device 5, respectively, the position indicator of the output shaft 10, closed by a transparent cover 11.

The input device 5 is attached to the housing 1 by four studs 12. To install the unit on various types of mechanisms, the input device allows rotation by a multiple of 90 ° in the plane of its articulation with the housing.

The terminal block 7 is fastened inside the input device 5 with three screws 13. Through the terminal block 7 there are conductive studs 6, to which the pin contacts of the cscwitches and the normalizing converter 4 are soldered.

The block of microswitches 2 consists of two racks 14, on each of which two microswitches 15 (S1, S2, S3, S4) are fixed with contacts 16. Microswitches are designed to limit extreme positions and signal movement of the shaft 17, which is connected to the output shaft of the actuator .

Racks 14 are attached by two plates 18 and 19. On the shaft 17 are fixed stops 20, which when turning the shaft 17 press through the contacts 16 on the buttons of the microswitches 15, causing them

q) a6aTbiBaHHe. The stops 20 can be installed at a given angle of rotation of the shaft 17.

The resistor element 3 is mounted on the plate 18 and is designed to convert the angular movement of the output shaft 17 into a proportional electrical signal. The roller of the rheostat element is kinematically connected with the shaft 17 through the gear 21 and the gear wheel 22. When the shaft 17 is rotated for a full stroke 90, the roller of the rheostat element 3 passes the full resistance variation range (0.15 -3) kOhm, the normalizing converter 4 converts the ohmic signal into a unified current (0-5), (0-20), (4-20) mA.

The explosion protection of the signaling position unit is ensured by enclosing live parts in an explosion proof enclosure.

Explosion-proof sheath:

- possesses sufficient mechanical strength and is explosion-proof, that is, it withstands the explosion pressure of an explosive mixture that can penetrate the shell from the environment;

- excludes the transfer of blast into an explosive explosive atmosphere, that is, it is explosion proof.

Explosion protection of the shell is ensured by the use of slotted explosion protection. Crevice protection eliminates the transfer of the explosion into the environment.

Sources used 1. Certificate of the Russian Federation No. 17647, cl. G 08 B 23/00, 2000.

Claims (1)

The position signaling unit, comprising a housing with a microswitch unit housed therein, a sensor assembly with a rheostat element, an input device, an output shaft position indicator, the live parts of the unit are enclosed in a flameproof enclosure, and the input device can be rotated through an angle multiple of 90 ° in the plane its articulation with the housing, characterized in that it additionally introduced a normalizing converter, electrically connected to the rheostat element.