EP2945899A1

EP2945899A1 - Overload-prevention means for container crane installations

Info

Publication number: EP2945899A1
Application number: EP14700654.8A
Authority: EP
Inventors: Helmut Kring
Original assignee: Sibre Siegerland-Bremsen GmbH
Current assignee: Sibre Siegerland-Bremsen GmbH
Priority date: 2013-01-15
Filing date: 2014-01-15
Publication date: 2015-11-25
Anticipated expiration: 2034-01-15
Also published as: SI2945899T1; CY1121808T1; RS58949B1; WO2014111424A1; PL2945899T3; PT2945899T; ES2734219T3; EP2945899B1; DE102013200514A1; HUE045369T2; LT2945899T; TR201910195T4; DK2945899T3; HRP20191336T1

Abstract

A method and an apparatus are provided for preventing overload of a lifting mechanism for a container crane installation, comprising two identical lifting mechanisms on either side of a gear mechanism (20), each with a drive motor (50, 50'), of which the drive shaft (60, 60') is connected to a gear-mechanism input shaft (80, 80'), and with a safety brake (180, 180') on a cable drum (140, 140') on an output shaft (120, 120') of the gear mechanism (20), wherein lifting cables (150, 150') guided around the cable drum are connected to a load (160) or to a container-receiving headblock (160), and wherein, when a raised container is being raised and moved, at least one sensor (130, 130') determines an overload or a potential overload and the sensor (130, 130') triggers the safety brake (180, 180') on the cable drums and also a blocking brake (70, 70'), which is provided on the motor-drive shaft (60, 60') and stops the flywheel mass of the motor.

Description

Overload protection for container crane systems

The invention relates to a method and a device for securing container crane systems in case of overload.

2 shows a standard hoist 1 for container cranes, the two hoists with coupled via a gear 2 identical drive and output strands 3, 3 'and 4, 4', wherein in the following only the left hoist is explained,

A drive motor 5 is rotatably connected via a drive shaft 6 with a brake disc 9 and this with a transmission input shaft 8 of the transmission 2. On the brake disc 9, a service brake 11 is provided with spring-loaded brake shoes and a brake release device, not shown, the transmission 2 drives via transmission output shafts 12 cable drums 14 with a cable 15, to the cable drum a brake disc 17 is fixed to the safety brake 18 with spring-loaded brake shoes The cables 15 are attached to a head block 16, a substantially rectangular frame, on which a spreader is received, which receives a not shown container via corner fittings, hereinafter the head block 16 as conveyed or designated as a load,

The service brake 11 operates during operation to decelerate the load with a relatively high duty cycle, while the safety brake 18 is switched on only at the beginning of operation and off at the end of the operation, unless during operation no emergency stop due to a failure of the crane operation occurs .

If, due to the failure of a component in the drive train, an overspeed is detected on the drive shaft 6 or on the transmission output shaft 12 or if an emergency stop of the system is necessary due to another fault, then the i Safety brakes 18, 18 'and the service brakes 11, 11 "by an emergency stop signal issued by the crane operator., For safety reasons, the safety brakes 8, 18' have a shorter dead time than the service brakes 11, 11 ', so that the safety brakes 18, 18' earlier close and thus pick up the load that is acting on the Hubseüen,

During lifting operations during container handling, in particular when lifting a container from the narrow loading shafts of container ships, the container may jam or jam in the loading shaft. If the crane attachment is not stopped in time, considerable damage can result, including destruction of the entire crane system can lead. The snagging or snagging of a container is referred to in technical jargon as "snag". In a standard hoisting gear according to FIG. 2, an overload event due to the container getting stuck is detected by the crane operator and triggered an emergency stop by the crane operator.

At present, two systems are known which prevent an overload on the crane structure by automatically switching off the hoist. The older system is based on hydraulic dampers attached to the end of the hoist struts. This device dampens the impact, which is introduced in a snag in the crane structure. At the same time, the brakes of the hoist fall for a given damping travel and thus stop the hoist. The brakes are the same as those of a standard hoist. This system requires a great deal of time to restore the operational readiness of the crane system after an emergency stop, so that it can continue to work with the crane system.

A more recent system is described in DE 10 2006 003 832, which is shown in FIG. In Fig. 3, the same reference numerals as in Fig 2 are used for the same or corresponding components

Between the drive motor 5 and the service brake 11, an overload clutch 7, 7 'is provided, which is designed for a specific, maximum transmittable torque from the engine 5 to the transmission input shaft 8. If this torque is exceeded, the two coupling halves of the overload clutch 7 separate, so by disconnecting of the engine 5 no more drive torque on the The opening of the overload clutch 7 activates an overload sensor which emits a signal to a controller, which then interrupts the crane operation or stops by trigger signals to the service brakes 11, 11 'to the transmission input shafts 8 and the safety brakes 18, 18th 'To the cable drums 14 to block the drive train and the drive train, This prevents that decoupled from the engine 5 load 16 automatically lowers by gravity.

The brakes 11 and 18 are designed as industrial brakes, which close spring-loaded and can be solved by a suitable brake release device, which works against spring force, Such Bremslüftgeräte work in many cases electro-hydraulically, i. an electric motor builds up a hydraulic pressure on a working against a spring working piston via a hydraulic pump, which optionally solves the brake at sufficiently high pressure via a lever linkage ,,

The safety brake 18 can also be designed as a directly hydraulically releasable safety brake,

The measures provided for in this known crane system on the drive motor 5 overload clutch 7 takes a certain amount of time until the coupling halves of the overload clutch in Überzulfail separate. Overload clutches also have a very high spread until they respond when an overload occurs, Accordingly long may trigger the overload sensor, which detects the opening of the overload clutch 7, and then to give a signal to the controller, which in turn trigger signals to the brakes 11th and surrenders 8 and stops crane operation. In this case, a correspondingly high tension of the Hubsetle 15 occurs, which results from the maximum transmissible torque of the overload clutch 7

If the reproduced in Fig. 3 Snag-load system has responded by disconnecting the overload clutch 7 to an overload, then the load 16 is made to slide by controlled opening of the safety brakes 18 in order to achieve a free movement of the container by hooking or jamming has triggered the overload, then the overload clutch 7 must be manually closed again to continue the working operation of the crane system This is very time consuming

Both the reproduced in Fig. 2 standard hoist and in Flg. 3 reproduced hoist with overload clutch 7 responds exclusively to an already occurred overload by the conveyed 16,

With the present invention, the safety of container crane systems to be improved and above all the time to restart the hoist to be shortened when the hoist was stopped because of overload

According to the invention, when lifting and moving a raised container by at least one sensor, an overload or an approaching overload is detected and the safety brake on the cable drum and a blocking brake provided on the motor drive shaft are triggered by the sensor blocking the motor.

According to the invention, a method is provided for overload protection of a

Hoist for a container crane system, comprising two identical hoists on both sides of a transmission each having a drive motor, the drive shaft is connected to a transmission input shaft, and a safety brake on a cable drum on an output shaft of the transmission, wherein the cable drum guided hoisting ropes with a load or with a container receiving head block are connected, and wherein when lifting and moving a

lifted container by at least one sensor Überlasat or announcing overload is determined and the safety brake to the

Drum drums and provided on the motor drive shaft blocking brake is triggered by the sensor, which stops the flywheel of the engine

The blocking brake and the safety brake can be triggered by the sensor when the overload occurs, but preferably it is triggered before the overload occurs,

By the impending overload detecting sensor early a possible overload is detected, so that the hoist can be stopped before the Overload occurs. An overload is specified by a specific value of the load, which may not be exceeded to protect the crane system, In the prior art, the crane operation is stopped upon occurrence of this overload, according to the invention, the crane system is stopped before reaching the overload value, for example, 80% of the overload value are reached

For detecting an overload or an imminent overload, any sensor known per se can be used. Preferably, at least one inclination angle sensor and / or at least one acceleration sensor are attached to the head block of the hoist in order to be able to detect a threatening overload as early as possible.

The blocking brake and the safety brake are triggered before the overload case occurs

It may be sufficient to provide a tilt angle sensor and an acceleration sensor on the head block. Preferably, a tilt angle sensor and an acceleration sensor are provided in the area of each hoist on the head block

Due to the fact that the safety brakes and the blocking brakes are triggered by the sensors detecting an imminent overload, the crane system can be quickly and easily returned to the operating state after an emergency stop of the hoisting gear because the operational readiness of the crane system can be restored by electronic signals without an overload clutch must be closed again. For recommissioning after an emergency stop of the crane system, the blocking brake on the drive motor and the safety brake on the cable drum can be alternately released and closed again. This program can be executed very quickly, so that the crane system is ready for use again in a short time Hoist is signaled by the sensors indicating that a previously detected initial state has been reached again,

The fact that the hoist is stopped before the overload occurs, too occurring tensions kept lower than in the prior art, if the overload! already occurred, which in addition to a sparing Krananiage by lower tensions a quick restart of the hoist is favored,

While the service brake may be equipped with an electro-hydraulic brake release device or another type with a relatively long closure time of e.g. 400 milliseconds, which is suitable for a relatively high switching cycle, advantageously both the safety brake and provided on the engine blocking brake is formed by a brake to be hydraulically, in which by rapid reduction of the hydraulic pressure by large cross sections for the hydraulic fluid briefly stored spring energy is released to close the brake, in such a hydraulically to be vented by a control block brake resistances for the hydraulic fluid to overcome when reducing the hydraulic pressure, as is the case for example in an electro-hydraulic brake release device by the hydraulic pump, thereby closing times the brake upon receipt of a signal from the one load increase or an impending overload detecting sensor in the order of 80 to 90 milliseconds achieved.

Advantageously, both the safety brakes and the blocking brakes are activated by accelerated degradation of a hydraulic pressure for a short time, which releases the stored spring energy for fast closing of the brake

If an emergency stop has been triggered by the sensor detecting an overload or an impending overload, the blocking brake provided on the drive motor is preferably first briefly opened for restarting the hoisting gear and the safety brake provided on the cable drums is kept closed, whereupon the blocking brake on Drive motor is closed again and provided on the cable drums safety brake is briefly opened, this process is repeated until the sensors re-reaching the operating state Show.

In this way, stresses are dissipated in the direction of the engine,

Here, the opening and closing of the brakes is expediently carried out by a control program of an electronic control device to restore the operational readiness of the hoist in the short term.

To simplify the structure of the hoist, the blocking brake on the drive shaft of the drive motor may be controllable by a hydraulic control block to operate as a service brake during operation of the hoist, while upon receipt of a stop signal from the sensors, a brief release of the hydraulic pressure for rapid closure the brake is possible

The fact that the safety brake on the cable drum absorbs the maximum increase in load, the blocking brake provided on the engine can only intercept the flywheel of the engine, so that the hoist between locking brake and safety brake is not further loaded by tension

Overall, a high degree of safety of the crane system is already achieved by detecting an imminent overload and release of the brakes at an impending overload on the one hand, and on the other hand, after an emergency stop of the hoist by a self-ascertaining overload sensor determines the re-commissioning short-term, because the achievement of operational readiness is determined and displayed only by electronic means,

According to the invention, a hoist for a container crane system comprising two identical hoists on both sides of a transmission each with a drive motor, the drive shaft is connected to a transmission input shaft, and a safety brake on a cable drum on the output shaft of the transmission, wherein the cable drums guided hoisting ropes with a load or are connected to a container receiving a head block, designed so that at least one sensor for detecting an overload or an impending overload is provided on the head block and / or on the hoisting rope between the head block and cable drum and on Drive motor is provided a blocking brake on the drive shaft, which is triggered together with the safety brake from the sensor,

Advantageously, the safety brakes and the blocking brakes are each controlled by a hydraulic control block, which triggers a faster closing of the brake by accelerated reduction of the hydraulic pressure,

For this purpose, the hydraulic control block expediently two by an electronic Signa! switchable valve paths, of which a valve path due to large flow cross-sections accelerated degradation of the hydraulic

Pressure allows, while the other valve travel forms the required for a service brake flow path of the hydraulic fluid.

To monitor the behavior of the container during the lifting process, as already mentioned, sensors known per se can be used to determine a load increase, rope force sensors, tension sensors, measuring pins or rope monitors can be provided in which the hoist rope guided over three offset from each other rollers is,

Preferably, an acceleration sensor, which detects an acceleration of the load along horizontal axes, and an inclination sensor is provided, which detects an inclination of the container or the load and thus an imminent overload at least on one of the hoists. If the values of the angle of inclination and the acceleration along horizontal axes leave predetermined values, the safety and blocking brakes are triggered.

For early and sensitive detection of impending overload, an acceleration sensor and a tilt angle sensor can be sufficient. Preferably, such sensors are provided on each of the two hoists,

In addition to a tilt angle sensor and acceleration sensor or even without this, a load increase ascertaining sensor can be provided on each of the two hoists, such as a rope force sensor or a rope keeper

If a service brake is already present on the drive shaft of the drive motor in an existing crane installation, a blocking brake can be provided for the design of the snag-load installation according to the invention between drive motor and service brake, which operates in the manner described above. In this way, crane systems equipped with a standard hoist can be retrofitted

On the other hand, a standard hubwerk be upgraded in such a way that the existing service brake is controlled by a control block through which the brake can perform the function of a service brake and a locking brake.

In the case of an existing hoist with overload clutch may be provided on the drive shaft of the drive motor instead of the upper-load clutch, so that the existing hoist can be retrofitted according to the invention without additional space.

The hoist according to the invention and its described operation can be advantageously used in other lifting systems, such as an elevator or the like. Here, the structure of the hoist essentially corresponds to one side of the described two-sided hoist of a container crane system ..

Due to the fact that an increase in the load or an imminent overload is detected early by the system according to the invention, it may be that an emergency stop of the brakes is triggered more frequently than in known cranes, but can be restored in a short time ready for operation of the crane system On the whole, the safety of the crane system is improved and the crane system is also largely spared from excessive stresses by triggering the brakes even before the overload case occurs. The invention will be explained in more detail for example with reference to the drawing. Show it

1 shows schematically a hoist according to the invention,

Fig. 2 a standard hoist, and

3 shows a known hoist with an overload clutch,

In the container hoist in Fig. 1, two coupled via a gear 20 identical drive and output strands 30, 30 'and 40, 40' are provided, whose elements are provided with the same reference numerals. In the following, essentially only the left drive and output line 30 and 40 will be described. The same description applies to the right cable lift system.

The Seilhubanlage has a drive motor 50, the drive shaft 60 is fixedly connected to a blocking brake unit 70. In this exemplary embodiment, the brake unit 70 has a brake disk 70, 1 on the drive shaft 60 and brake shoes 70, 2, which act on the brake disk 70, 1 by spring force.

For ventilating or lifting the brake shoes 70, 2 from the brake disc, a schematically indicated hydraulic control block 70, 3 is provided, in which

Hydraulic fluid acts on a piston via large cross-sections By creating a hydraulic pressure acting on the piston, the brake shoes can be loosened and by briefly reducing the hydraulic pressure due to the large passage cross-sections for the hydraulic fluid, the spring force to

Closing the brake will be released for a short time.

Furthermore, on the drive shaft 60 of the motor 50, a service brake 90 rotatably connected to the drive shaft 60, which in the illustrated embodiment, a brake disk 90.1 and 90.2 acting on this brake shoes 90.2, At 90 3, a brake release device is indicated schematically, by means of which the brake can be solved The brake release device on the service brake can be a per se known electro-hydraulic brake release device, Instead of a disc brake, brake drums or corresponding other brake devices can also be provided as service brake 90. Preferably, a disc brake unit according to DE 102012 107 723 is provided as operating brake 90,

The brake disk 90.1 is rotatably connected to a transmission input shaft 80, Under torsionally rigid connection is also a compound provided with a damping element to understand

The transmission 20 drives via a transmission output shaft 120 to a cable drum 140 around which a cable 150 is guided .. At each cable drum a safety brake unit 180 is provided with a brake disc 180.1, which cooperates with brake shoes 180 2. At this safety brake unit 180, a hydraulic control block 180, 3 is provided in the same way as in the blocking brake unit 70, which allows a rapid reduction of the hydraulic pressure by means of large cross sections, in order to allow a short-time closing of the brakes.

The two identical Seilhubanlagen on both sides of the transmission 20 are connected via the cables 150 and 150 'with a head block 160.

At 130 and 130 ', an inclination angle sensor and an acceleration sensor are schematically indicated on the head block 160, which detect an imminent overload case when a predetermined acceleration value and inclination angle is exceeded. The sensor 130 outputs an electronic signal to the blocking brake units 70 and 70 via a control device 170 As well as the safety brakes 180 and 180 ', the drive shaft 60, 60' of the drive motors 50 and 50 'and the cable drums 140 and 140' stop at the input of the signal with a very short response time. The drive motors 50 and 50 'are switched off by a switching device, not shown in a sensor 130, 130' triggered signal, Conveniently, the service brake 90 is closed by the signal of the sensors 130, 130 ', even if this closes later than the blocking brake and the safety brake ,. The drive motors are preferably designed as three-phase motors, wherein instead of switching off the drive motor, the three-phase motor can also receive a signal to rotate in the opposite direction, so that the drive motor can also be used as a brake.

Instead of an inclination sensor and an acceleration sensor 130, a cable force sensor, a load pin, a tensile force sensor and / or a cable guard between load 160 and cable drum 140 may be provided on each hoist to detect a load increase or overload. Such a sensor may also be used in addition to an inclination angle sensor and an acceleration sensor are provided.

It is also possible for a sensor which detects an overload to emit a signal to the brakes only when the overload occurs. However, an early detection of an imminent overload and a release of the brakes before the overload occurs are preferred

Inclination angle sensors are known per se. Preferably, an SD inclination angle sensor is used, which is able to determine the inclination angle in two mutually perpendicular directions over 360 °. Tilting of the head block 160 occurs, for example, then when the two hoists are not synchronized run, for example, by tilting the container on one side,

At the rope end points of container cranes it is also possible to provide load cells for single-cell detection, which can serve as sensors,

For example, a sensor that detects a load increase may be designed to track the progression of the rising load and to emit a stop signal early on a steep rise. At a slight increase in the load curve, a stop signal may be generated at a later time. when a certain percentage of the increased load is reached

The invention is not limited to the type and design of a sensor 130, If an upcoming overload case is detected by the sensors 130 or further sensors provided near the load 160 and a stop signal is given to the brakes, then in each case the safety brakes 180, 180 'and the additional blocking brakes 70, 70' are actuated to trigger, The service brake 90, 90 'need not close in such an upcoming overload case, but advantageously also the service brake is triggered by the sensors 130, 130' to close. As stated, the service brake may be designed to have a longer response time than the safety brake 180 and the blocking brake 70 has.

After an emergency stop existing voltages can be reduced by a mutual release of the blocking brakes 70, 70 'on the motor 50, 50' and the safety brakes 180, 180 ',

When reducing tension on the hoisting ropes 150, the blocking brakes 70, 70 'on the motors 50 and 50' are preferably first briefly released, while the safety brakes 180, 180 'are closed, and then closed again, whereupon the safety brakes 180, 180' the cable drums 40 are released and then closed again, these briefly successive operations are preferably carried out automatically by a program, the clock sequence can be high with automatic switching of the brakes.

Preferably, a deadman switch is provided, which the crane operator keeps pressed as long as the program is to proceed to release the tension. In this way, the crane operator monitors the automatic process,

In this case, stresses in the hoist in the direction of the motor 50, 50 'are reduced, but it is also possible to reduce stresses in the direction of the load

According to a preferred embodiment, the weight of a newly recorded at the head block 160 container is determined and the torque of the drive motors 50 and 50 'in the upper limit to the Container weight set. This can be provided by a device of the crane control, for example in the control device 170

If in case of power failure and blocking of the conveyed 160, the crane system is stopped, the safety brakes 180, 180 'on the cable drums can be opened by means of hand pumps, Expediently, a manual lifting device is also provided on the blocking brakes 70, 70' on the drive motor

In the described embodiment, a blocking brake 70 is provided on the drive motor 50 in addition to the service brake 90. According to a further embodiment of the invention, only one brake unit 70, 70 'is provided on the drive shaft 60 of the drive motor 50, which functions as the blocking brake 70 and the service brake 90 Such a brake with two functions closes at standard speed for standard operation according to a service brake, while on the other hand in the event of a snag or emergency stop the brake closes quickly

This is achieved by a hydraulic control block 70 3 with two valve paths, wherein one can be triggered by an electronic signal valve path rapid closing of the brake 70, 70 'by large flow cross sections for the hydraulic fluid releases and the other valve is designed for the usual service brake, the higher switching cycles.

Such a hydraulic control block 70, 3, which permits two functions of the braking unit controlled by it, is preferably also provided as control block 180, 3 on the safety brake 180.

The blocking brake differs essentially from a service brake by the number of switching cycles on the one hand and by the shorter response time on the other hand,

The overload protection of a hoist according to the invention can also be used advantageously for other hoists than in a container crane system, for example in an elevator system in which the passenger cabin moves as a load in a narrow shaft, in such a hoist can Blocking brake 70 and the safety brake 180 may be disposed on a shaft on both sides of a transmission, Also in such an embodiment, preferably both brakes are switched by a hydraulic control block so that they each fulfill the function of a service brake and a blocking brake,

In such a hoisting gear, which substantially corresponds to one side of the hoisting gear in FIG. 1, the same embodiments apply with regard to the design of the brakes and the sensors as described with reference to the two-sided hoisting gear in FIG.

Claims

claims

Method for overload protection of a hoist for a container crane system, comprising

two identical hoists on both sides of a transmission (20) each having a drive motor (50, 50 '), the drive shaft (60, 60') with a

Transmission input shaft (80, 80 ') is connected, and

a safety brake (180, 180 ') on a cable drum (140, 140') on an output shaft (120, 120 ') of the transmission (20),

wherein hoist ropes (150, 150 ') guided around the cable drum are connected to a load (160) or to a head block (160) accommodating a container,

characterized,

that when lifting and moving a raised container by at least one sensor (130, 130 ') an overload or a

announcing overload is determined and the safety brake (180, 180 ') on the cable drums and on the motor drive shaft (60, 60') provided for blocking brake (70, 70 ') by the sensor (130, 130') is triggered, the flywheel the engine stops

A method according to claim, wherein the blocking brake (70, 70 ') and the safety brake (180, 180') are triggered before the overload occurs.

The method of claim 1 or 2, wherein for the early detection of impending overload, the inclination angle of the load (160) and / or a horizontal acceleration of the load is determined.

Method according to one of the preceding claims, wherein both the safety brakes (180) and the blocking brakes (70) by accelerated degradation of a hydraulic pressure are briefly activated, which releases a stored spring energy to close the brake method according to any one of the preceding claims, wherein for recommissioning the hoist after an emergency stop to release tension first provided on the drive motor (50, 50 ') blocking brake (70, 70 ') briefly opened and provided on the cable drums (140, 140 ") provided safety brake (180, 180') is kept closed, whereupon the blocking brake (70, 70 ') on the drive motor (50, 50') closed again The safety brake (180, 180 ') provided on the cable drums is momentarily opened. Method according to claim 5, wherein the opening and closing of the brakes is carried out by a control program of an electronic control device in order to restore the operational readiness of the hoist in the short term of the preceding claims, wherein the blocking brake (70, 70 ') on the Drive shaft of the drive motor (50, 50 ') is controlled so that it operates as a service brake during operation of the hoist, while on receipt of a stop signal from the sensors (130, 130'), the brake is quickly closed as a blocking brake. Hoist for a container crane system, comprising

Transmission input shaft (80, 80 ') is connected, and

a safety brake (180, 180 ') on a cable drum (140, 140 ") on the output shaft (120, 120') of the transmission (20),

wherein hoisting ropes (50, 150 ') guided around the cable drums are connected to a load (60) or to a head block (160) receiving a container,

characterized, at least one sensor (130, 130 ') for the head block (160) and / or the hoist rope between the head block (160) and the cable drum (140, 140')

Determining an overload or impending overload is provided and the drive motor (50, 50 ') a blocking brake (70, 70') on the

Drive shaft (60, 60 ') is provided, which together with the

Safety brake (180, 180 ') of the sensor (130, 130') can be triggered upon detection of an imminent overload, hoist according to claim 8, wherein the safety brakes (80, 180 ') and the blocking brakes (70, 70') each by a hydraulic control block (70.3, 180.3) are controlled, which triggers a faster closing of the brake by accelerated reduction of the hydraulic pressure. Hoist according to claim 9, wherein the hydraulic control block (70 3, 180.3) comprises two switchable by an electronic signal valve paths, of which a valve path by large flow cross sections a

Accelerated reduction of the hydraulic pressure allows, while the other valve travel forms the required for a service brake flow path of Hydraulikfiuids, hoist according to one of the preceding claims, wherein a

Rope tension or the tensile force on the hoisting ropes monitoring sensor is provided to determine a load increase hoist according to one of the preceding claims, wherein a

Inclination angle sensor for detecting the inclination angle of the load (160) and / or a horizontal acceleration of the load (160) detecting sensor (130, 130 ") is provided to detect an imminent overload, hoist according to one of claims 8, 9 and 11, 2, being on the

Drive shaft (60, 60 ') of the drive motor (50, 50') between the blocking brake (70, 70 ') and the transmission (20) a service brake (90, 90') is provided, , Hoist, including

a drive motor (50) on the drive shaft (60) a blocking brake (70) is arranged, wherein the drive shaft of the motor is connected to a transmission whose output shaft is connected to a cable drum on which a safety brake (180) is provided, and wherein at least one sensor (130, 30 ') is provided for detecting an overload or an imminent overload, which the

provided on the drive motor (50, 50 ') blocking brake (70, 70') and the safety brake (180, 180 ') triggers upon detection of an overload or an imminent overload. , Hoisting gear according to one of the preceding claims 8 to 14, wherein a control device (170) is provided which, after triggering an emergency stop for restarting the hoist, first briefly opens the blocking brake (70, 70 ') provided on the drive motor (50, 50'), while the provided on the cable drums safety brake (180, 180 ') is kept closed, whereupon the locking brake on the drive motor again

closed and provided on the cable drums safety brake is briefly opened, and wherein a program performs the switching steps repeatedly until the operating condition is reached.