DE2635612A1 - Load handling mechanism monitoring system - detects relative rotation between drive to load and measuring drive in parallel - Google Patents

Abstract

The monitoring system is for load-handling mechanisms with lifting, travelling and slewing motions and brakes to halt load movement under dangerous conditions such as shaft breakage, distortion or excess wear of gears, supporting chassis etc. when a signal is emitted to stop the driving motor and engage the brake. Parallel to the gearbox driving the load an unloaded measuring drive is coupled giving the same overall ratio, and pref. to the free end of the motor shaft etc. to which no torque is applied. Under normal conditions the load and measuring drives run at the same speed, but they are coupled to a signal emitter, so that as soon as they start to rotate in relation to each other the motor is switched off and the brake applied.

Description

Monitoring device for lifting, traveling and slewing gears

The invention relates to a monitoring device for motorized operated, equipped with a load gear for transmitting and converting the torques Lifting, traveling and slewing gear with safety brakes to intercept the moving load in danger fall, in the event of breakage or impermissible deformation of shafts or gears as well as in the event of excessive tooth wear or housing or supporting frame deformations, whereby the load gear one input shaft each coupled to the motor shaft and one with the drive shaft and Displacement shaft of the lifting drum or the lifting wheel of a rack and pinion winch or

the drive and displacement shafts of the running or swivel wheels or the like. having coupled output shaft and its translation through its gear stages is given and also the monitoring device an electrical or mechanical Has a signal trigger with mutually movable switching elements, which in case of danger causes the drive motor to be switched off and the safety brake applied.

It is known and appropriate, in some cases also mandatory, highly loaded load gear for transferring and converting rotary or. Driving torques and motor-driven hoists, as well as travel drives working on slopes and to monitor highly loaded rotary actuators during operation so that in the event of gearbox damage, Shaft breakage, excessive tooth wear and the like. The load is intercepted by safety brakes and the drive is stopped. There are many different solutions for this known.

It is known, for example, that speed monitors on the lifting drum or Landing gear shafts a signal to trigger the safety brake is given if the shaft rotates too fast or the shaft speed does not match the speed of the associated drive motor.

Also known are braking and safety devices, which are which are released when the shaft speed is too high, actuated directly or indirectly will.

The disadvantage of such devices is that they only work with a delay come into effect when the speed to be monitored is significantly different from the The target speed deviates, so that the braking process only occurs when the speed is too high is used, which must be taken into account when designing the brakes.

Drives with integrated safety gear are also known.

This can come from a worm gear running parallel to the load gear exist, which is driven with the drive motor and runs wear-free, wherein the worm wheel with the output shaft of the gearbox or the lifting or the Drive shaft is firmly connected and expediently has a self-locking slope (VDI News 5.9.75). Through the DT-PS 24 17 623 a further developed one is Execution known. Such designs are too expensive for larger drives and usually cannot be accommodated spatially.

The aim is therefore to have a reliably working monitoring device to develop that is easy to manufacture, does not take up a lot of space and is practical without delay, i.e.

works with a very small time constant.

This is achieved according to the invention in that parallel to the load transmission one free of torques and not with such profitable measuring gear with the same translation arranged 5 and is coupled to this so that both the input as well as the output shaft of the measuring gear each through accordingly the input or output shaft of the load transmission or in each case accordingly the motor or lifting, traveling or swiveling shaft, preferably from its second, torque-free shaft end is driven and thereby the input or

The output shaft of the two gears rotate at the same speed and that in the measuring gear either one, two gear stages shared common shaft is, or a gear rotatable on its shaft, so loosely mounted circumferentially is and the two coaxial, freely rotatable against each other, in the normal Operating state revolving at the same speed and thus relative to each other non-twisting parts with the switching elements of a mechanical or electrical Signal generator are provided and the signal generator switches off the drive motor and the signal causing the safety brake to apply triggers as soon as the two of them in the measuring gear rotatably displaced against each other parts rotate relative to each other.

Since such a measuring gear does not have to transmit any torque, does not require a significant amount of space, so that the actual Drive devices - apart from the connections for the measuring gear - unchanged can be retained.

Since the two rotatably mounted Scholtelemente des The signal generator already receives the signal in the event of a slight relative rotation in relation to one another to switch off the drive motor and trigger the application of the safety brake, works the monitoring device with extremely low Vr7ii0Orunq Wtw W. 7einqt <r.e. A Embodiment is below based on the attached scheme, the inventive idea non-limiting.

The drive motor 1 is via the load transmission with the gears Z1 'Z2' Z3 'Z4' Z5 'Z6' Z7 'Z8 the lifting drum 2 is driven either directly or via an intermediate gear 3, preferably from the second torque-free shaft end 11 of the motor 1 is the input gear. 1 of the measuring gear with the same speed driven like the input pinion of the load transmission.

In the measuring gear, this is done via additional gears Z'2 Z'3 Z'4 Z'5 the shaft 5 of the gear Z'7 loosely rotating gear Z'6 with the switching element 4 at the same speed as the shaft driven by the gear wheels Z'8 and Z'7 5 with the longitudinally displaceable counterpart, i.e. the second switching element 8 of the Trigger driven. The gear Z'8 or its Shaft coupled to the second, torque-free shaft end 12 of the lifting drum. at With the measuring gear intact, the two switching elements 4 and 8 of the signal generator run with the same speed. If there is a break in the motor or lifting drum shaft or in the gearbox between motor 1 and lifting drum 2, or increases the backlash, so there is a relative rotation between the switching elements 4 and 8, the Element 8 is moved and thus the limit switch is actuated, which controls the lifting motor 1 turns off and the safety brake 7 can be applied. Of course it could Brake 7 can also be triggered directly via a linkage, not shown here, in order to shorten the application time even further. Crucial to the proposed The only monitoring device is that the two elements 4 and 8 of the signal trigger be driven at the same number of revolutions. In what way this is achieved is completely free. It is not required that the individual Translation levels match in the two transmissions; only the total translation has to match of the two transmissions.

In this embodiment, the entire hoist with his Gearboxes and motors and lifting drums, shafts and incl.

the coupling between the drive motor and the gearbox or the coupling between gear and lifting drum, if necessary including additional gear for breakage and impermissible Deformation or the like. supervised.

In individual cases it may also be sufficient, for example, only to monitor the damage-free operation of the gear unit.

Of course, a monitoring device according to the concept of the invention can also be used to drive shafts under high loads, e.g. in rolling mill drives To keep control. Another example is curved shafts or pivoting displacements for containers with liquid iron. In such cases the measuring gear has none Gear ratios, but only two shafts that can be rotated against each other with the switching elements for the signal transmitter.

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Claims (1)

Patent claim monitoring device for motor-operated, equipped with a load gear for transmitting and converting the torques Lifting, traveling and slewing gear with safety brakes to intercept the moving load in the Ge drive falls in the event of breakage or impermissible deformation of shafts or gears as well as in the case of oversized tooth occlusion or deformation of the housing or supporting framework, where the load gear has one input and one coupled to the motor shaft the drive and displacement shaft of the lifting drum or the lifting wheel of a rack and pinion winch or the drive and displacement shafts of the running or swivel wheels or the like. coupled Has output shaft and given its translation by its gear stages and furthermore the monitoring device is an electrical or mechanical signal trigger with mutually movable switching elements, which falls in the event of danger The drive motor is switched off and the safety brake is applied, characterized in that that parallel to the load transmission a torque free and not with such resilient measuring gear arranged with the same translation and so coupled with this is that both the input and the output shaft of the measuring gear respectively accordingly through the input or output shaft of the load gear or each correspondingly by the motor or lifting, traveling or swiveling shaft, preferably is driven by the second, torque-free shaft end and thereby the input or output shaft of the two transmissions each with the same speed rotate and that in the measuring gear either one or two gear stages common Shaft is divided, or a gear rotatable on its shaft, so loosely revolving is mounted and the two coaxial, freely rotatable mounted, in the normal operating state revolving at the same speed and thus relatively non-twisting parts with the switching elements of a mechanical or electrical signal transmitter are provided and the signal transmitter on the shutdown of the drive motor and the application of the safety brake is triggered, as soon as the two parts rotatably displaced against each other in the measuring gear move relatively twist to each other.