DE7007874U - OVERLOAD SWITCH. - Google Patents

Description

Karl-Theodor Frhr.v.Negri

\ 4o7 Eheydt
, * Brucknerallee 167

To the G-ebrauehsmuster registration from March 1st, 197o Annex 2)

Circuit breaker_

Overload switches are mechanical or electrical mechanical units that, when an overload is reached, prevent a mechanical or electrical mechanical mechanism triggering damage to ropes, drive motors or the like Part of the regulatory requirements, since in the event of an inadmissible overload human life can be endangered by the goats on the ropes or questioning elements.There are known switches that act as overload protection devices that move mechanical devices that, depending on the overload, move over electrical containers that ζ · Β. Interrupt the power supply to the hoist motor and thus prevent overloading of the suspension rope.
Overload switching devices are also known, whereby a rope is guided over a jiolle attached to a swivel arm of the crane, which is under the tension and yields in the event of overload, whereby a lever actuates an electrical switch and thus interrupts the circuit, so that no overload of the crane rope can occur.

These known overload protection devices have the Ilaehteil that the structural elements used absorb the entire rope load and must be dimensioned accordingly. Another disadvantage is that such overload devices work undamped, which means that the shut-off elements respond prematurely in the event of a gradual actuation of the cable motor, for example, which leads to undesired vibrations of the entire crane system and thus calls into question the safety shutdown. that such flexibility devices only work on one side, that is, respond either only to pressure or only to tensile forces.
These "drawbacks" are identified by the below-described and

and drawn overload switch fixed The circuit breaker essentially consists of a cylindrical .Pipe body (1) with an upper control room and a lower power transmission room. In the upper tree there are two independently adjustable electrical switching contacts (2.5), which in one Switch housing (4) are held on adjusting spindles (5). A cover (6) closes the upper seam and presses Pressure ring (7) center the switch housing (4) on the partition wall (11) so that it is an immovable unit with the upper one Switch room forms · Both switch contacts (2,3) are ready to switch on until their switch levers are in the upper or lower

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As long as the two levers of the switching contacts are on the larger one Move the diameter of the control piston, the drive motor can be operated safely in both directions of rotation.

In the lower power transmission space of the ear body (1) there are two cylindrical screw compression springs (8,9) installed under pretension, the finite length of the prestressed each being formed by the cover (1o) and a head partition (11).

A driver (12) is clamped gentrically between the compression springs is permanently connected to a shift rod (^ 3) »the is guided centrally in the cover (1o) and partition (11). At the lower end of the switch rod is a fixed connection head (14) attached, which is attached to a bolt (15) with a cross member (16? is positively connected. The traverse is attached, screwed or welded to a solid base, for example. The upper end of the shift rod (13) is an adjustable one Control piston (17) provided, secured by a lock nut (18) Located on the cylindrical power transmission space of the ear body (1) opposing force application axes (19) »e.g. at the end a motor gear rocker (see Fig. 2 point X) with this force-fit connected are · A well-known double-acting oil-gas pressure vibration damper (2o) is frictionally connected to the upper control room of the hearing body (1) at a flebeleye, as well as with the fixed traverse (16) by bolts (15) jSo circuit breaker and vibration damper with the crossbeam result in a firmly attached structural unit.

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Description of the mode of operation for the overload switch Fig.1 __ The introduction of force to the overload switch takes place on the two Force application axes (19). If the force P is directed upwards by a rope load (direction a), the ear body moves (1) also in this direction. The compression spring (8) is designed so that it compresses proportionally according to the force and counteracts this force. Possible stroke = s The electrical switching contacts (2,3), e.g. well-known jumpers, make the stroke movement of the tubular body non-positive and slide along the fixed control piston (17) * The switching contact (2) comes to the beveled at the end of the stroke or conical surface of the control piston and dips into this, whereby a switching process is triggered, the the drive motor stops. A well-known electrical interlock ensures that the drive motor is intentional or unintentional from this situation can no longer continue. Kur the switching contact (3) is in the ready position because he is on the largest diameter of the control piston The vibration damper C2o) acts like the compression spring (8) of the force P counteracts and prevents a permanent switch-off of the switch contact (3) when the upper target switching point is reached. If the force now acts downwards (direction of arrow b) 'it comes Compression spring £ 9) to the effect and tense proportionally to the Hub si. The switching contact (2) slides with its control lever on Control piston (17) downwards until it is in the lower leonian Surface of the control piston runs in, whereby the switching process is triggered and the drive motor comes to a standstill. The drive motor can also be deliberate or unintentional from this division no longer wanted to run out because the circuit breaker is in this in the switched-off position and only through the readiness position of the hold contact (2) in a different direction of rotation Since the visual vibration damper after both It influences the forces P and P1 in a damping manner. Figure 2 shows an example of an application of the circuit breaker A gear motor (21) transfers its torque to a pulley (22) on which a load P hangs via a guide pulley.

The gear motor lies on a base plate (.23) »which is in the rope = - Grooved pulley center M is rotatably mounted · At the opposite The fork-shaped end of the base plate is the circuit breaker with the force application axes (19) with the base plate The Overload switch with the vibration damper abc Point X, force application of the overload switch is in dormant state, i.e. an ¥ orlast small ρ is present and the Gear motor is in equilibrium with the preload small p. If the gear motor is switched on in such a way that the preload is equal to zero, the overload switch, the ochaltkontakt3, sicts itself falls into the conical surface of the control piston and switches off the gear motor. Acts on the point χ of the overload switch now only the weight of the motor with gear on the base plate and that of the base plate itself, so that a light slack rope arises without the rope jumping out of its pulley o Since the switching contact (3) is in the ready position while (2) has switched off, the gear motor is only open Raising the - ^ branch controllable. If this process is triggered, pulls the pulley (22) puts the load up, which makes the circuit breaker also a stroke in direction a and is located with the first initially assumed constant load again in equilibrium »becomes nua. the burden is greater due to some circumstance, e.g. getting stuck on a protruding object, or the unknown weight of one The load has been misjudged and an overload occurs, which would stress the rope inadmissibly high, the pank moves * X on the overload switch in direction a. The switching contact is approaching the upper target switch-off point of the control piston and switches the hoist motor off be driven.

This application example is only one of many ^m the application öglichkeiten of Überlastsehalters "Since the same is arranged in the ratio of the He" bslJ poor rope groove radius r to the base plates lever arm R eg in the ratio Irio, is introduced through the rope load force at point X of the Überlastsehalters in This Pail 1o times smallerJ This means that the circuit breaker is not only structurally smaller, but also more precisely in the »response to the target switching points for overload and slack rope, since the switching paths are correspondingly large ·

Claims (1)

i 5) Burcli change of compression springs (8,9) as well as, de * leverage riR is given a wide scope since only a small number of types of overload sciaging as a result it will be necessary to have a gate part for spare parts and stock keeping They are well-known individual parts of the circuit breaker that have been tried and tested for many years in the execution of the construction brought into effect so that there is a high level of security against impermissible over- and undercutting of the permissible load. Claim protection 1 · Overload switch as a safety device against overload and Slack rope, characterized in that a driver is located between the facing ends of two cylindrical helical compression springs (8, 9) (12) is clamped centrically, which is firmly connected to a shift rod (13) is seated, the end of which is prestressed length of the helical compression springs from one cover (1o) and one the partition (11) located in the tubular housing (}) is formed 2. Overload switch according to claim 1, characterized in that the The switching rod (13) is guided so that it can slide centrally in the cover (1o) and the partition (11) 3. Overload switch according to claim 1 and 2, characterized in that one end of the shift rod (13) with an adjustable control piston (17) is provided, while the other end of the shift rod »(13) ' via a connection head (.14) with a traverse (16) via bolts (15) is rotatably positively connected. 4e overload switch according to claim 1bi3 3 characterized in that the electrical switching contacts (2,3) in a closed Round housing (4) are attached to the two adjusting spindles (5) while the round housing is centered in the cylindrical tubular body (1) and durcü. a pressure ring (7) over a cover (6) in its position in relation to the pipe body, φχΐη is « Overload switch according to Claims 1 to 4, characterized in that the cylindrical tubular body (1) is non-positively connected to a on the other hand with a load-dependent, double-acting friend Gas oil pressure vibration damper (2o), with the other end of the Vibration damper frictionally on the common traverse (16 has connection, so that the overload system (1,2ο, 16) a unit bidet. 20.8.70 6 · Overload switch after. Claim 1 to 5 characterized thereby · net, that the tTberlsstsystem 0,2ο, 16> on a base plate C23J rotatable in the center of the rope groove H sig is arranged so that the lasthefcelarn E. is larger than the rope grooved log length small r