FI119104B - Apparatus for controlling the booms in a level crossing facility - Google Patents

Description

119104

EQUIPMENT FOR CONTROLLING THE BOARD BOX BOARD

The invention relates to the control of booms of a plant used at a level crossing between a road and a railway line. More particularly, the invention relates to apparatus for raising and lowering booms.

Level crossing facilities are commonly used at road and rail level crossings which, for example for cost or environmental reasons, cannot be implemented at different level crossings. Level crossings can be categorized in many ways, for example by 10 warning devices or by the type of intersection. The warning devices used at level crossings are either half-booms or light and sound warning devices. The half-boom warns the train with an audible and light alarm and closes the right-hand lane of the carriageway on both sides of the track with booms. Light and audible warning devices alert the train to approach by a flashing red light and an audible alarm.

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Conventionally, the level crossing boom turning device comprises a housing, a gear motor, a friction clutch, a parking brake, an open transmission, a torsion spring, and other equipment such as a boom, shock absorbers, a terminal block and a hand crank coupling.

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The boom swivel housing is made of conventional hot-dip galvanized *.;, · Stainless steel sheet, and one wall of the housing is made up of the appropriate ..! · 1 door with lock.

• · · • • • • • •. ·: 25 The electric gear motor for the gear unit used as a drive unit is either a · · · · ... · 24V DC or a three-phase motor. The gear unit is integral with the electric motor.

The function of the friction clutch in the system is to prevent the device from breaking by sliding • f · 30 in a situation where the movement of the boom is prevented. The friction clutch restricts the device to get * · · ·: 1 1 1; torque to the desired value, which is factory set to approximately 16-18 Nm • \ # slip torque. The clutch is equipped with a shaft nut to adjust the slip torque.

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Two types of parking brakes are used in boom swinging devices, depending on the application. When the device is required to lower the boom immediately in the event of a power failure or malfunction to the monitoring circuit, an electromagnetic brake is applied which, when energized, locks the boom in the up position and releases when the power is cut off.

5 In applications where the boom is not required to land freely, an electromagnetic spring pressure brake is applied which locks and unlocks the boom when power is applied.

Open gear tooth gear transfers the gear motor movement to the boom shaft.

10 The gear ratio is 28.7, which raises the torque from the friction clutch to a torque of about 16-18 Nm on the boom, about 400-500 Nm. Through the above-mentioned transmission, the operating time of the boom from one extreme position to the other is about 8 seconds with the engine running at its nominal speed.

The torsion spring is mounted in the device so that it accelerates movement up to about 45 ° and brakes the rest of about 45 ° of movement. In this case, when the boom is in the upright position, it is affected by a downward turning torque of about 300 Nm, which also guarantees the boom to lower freely when operating the safety device.

The boom swinging device usually uses an aluminum boom of 3.5-10 m.

20 The weight of the finished boom is approximately 3.5 kg / m. The boom is usually equipped with boom lights. The roof of the device has rubber shock absorbers that act as a stop for mechanical movement, which also stops the boom smoothly. There are three limit switches for controlling the boom swivel. The hand crank is a device-specific ··· accessory with an opening in the housing for 25 sides opposite the boom.

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In the present invention, the drive motor of the boom turning device is a • · \ V short-circuit gear motor. In this case, the solution according to the invention does not require separate adjustment of the sliding moment and the mechanical friction clutch can be replaced by a software 1 30 special arrangement.

The solution according to the invention e.g. improves the reliability of the boom swivel and,]] .; usability. In addition, the need for device maintenance is reduced.

More specifically, the boom turning device according to the invention is characterized in what is stated in the characterizing part of claim 1.

The invention will now be described in more detail by way of example with reference to the accompanying figure, in which Figure 1 schematically illustrates the construction of a boom swivel device according to the invention.

1, the device is controlled by a PLC (Programmable Logic Circuit) which controls the short-circuiting motor via a frequency converter. The short-circuit motor, in turn, drives the boom shaft through open transmission.

15 In addition to the short-circuit motor, the PLC controls the parking brake of the boom lift and collects information on the limit switches. Depending on the application, the parking brake used in the equipment may be an electromagnetic brake or an electromagnetic spring pressure brake. The function of the parking brake is to lock the boom up or down. The limit switches transmit boom position information to the PLC at a convenient point in the boom movement to initiate the boom stop and 20 boom stops in the up or down position.

• • e a • a · • ta t • · · * .ί. ' In the boom swivel, the torsion spring, shock absorbers and any tt a · «.: the hand crank to be installed operate independently without the control of the PLC.

The solution according to the invention provides a boom turning device which does not require a separate friction clutch, so that its slip torque does not need to be mechanically adjusted by means of a shaft nut. In the solution according to the invention, the function of the friction switch is replaced by the software layout of the PLC and the frequency converter. In this way, • a a a a * ... 1 avoids maintenance due to friction plate wear and protects the a ^ • j · 30 boom from possible breakage.

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The solution according to the invention is also capable of adjusting the boom operating times, i.e. the time from boom movement from one end position to another, according to the needs of the application, irrespective of the direction of the boom control.

The solution according to the invention is not tied to using a PLC to control a short-circuit motor, but the solution according to the invention can also be implemented without a PLC, for example by means of relay logic. In addition, the control logic of the short-circuit motor and the frequency converter can be combined into one unit if necessary.

The solution of the invention substantially improves the usability and reliability of the boom drive compared to conventional boom turning devices.

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Claims (3)

119104 A boom turning device for controlling the level crossing booms comprising a drive motor for raising and lowering the boom, the drive motor being coupled to the 5 boom shaft via open transmission, the boom swing drive as a short-circuit motor, and means for controlling the drive motor. . Boom swivel device according to claim 1, characterized in that the device comprises a parking brake controlled by a PLC. Boom turning device according to claim 1 or 2, characterized in that the device comprises limit switches for transmitting information to the PLC. 15 • I · t • I · ··· »t» * «· • 4« • • f «4444 444 • · •» 444 • 4 · 4 4 4 4 444 444 • · • ♦ · · • 1 4 4 4 4 4 4 • · 44 · • 4 • · ··· • 4444 144 • · • · • 44 «444 444 · · 119104