CN117905655A - Wind-powered electricity generation impeller lockpin withdraws from alarm device - Google Patents

Abstract

The invention relates to the technical field of wind power generation and discloses a wind power impeller lock pin exit alarm device. The wind power impeller lock pin exit alarm device comprises a base, a displacement detection assembly and an alarm assembly, wherein the displacement detection assembly is arranged on the base, the base is used for being installed on a hole wall and supporting the displacement detection assembly at one end of an impeller lock pin shaft, the displacement detection assembly is used for detecting whether the position of the impeller lock pin shaft moves or not, and the alarm assembly can send out an alarm according to a position movement signal fed back by the displacement detection assembly. According to the alarm device provided by the invention, when the impeller lock pin shaft has the withdrawal phenomenon or withdraws for a certain distance, the alarm component gives an alarm, and an operator checks the state of the impeller lock pin shaft in time, so that the impeller lock pin shaft is prevented from being withdrawn, the phenomenon that the hub suddenly rotates due to the fact that the operator does not find the phenomenon after the impeller lock pin shaft withdraws is prevented, and the operator can make countermeasures in advance according to the alarm, so that the safety risk is avoided.

Description

Wind-powered electricity generation impeller lockpin withdraws from alarm device

Technical Field

The invention relates to the technical field of wind power generation, in particular to a wind power impeller lock pin exit alarm device.

Background

The wind generating set consists of a foundation, a tower, a cabin, a hub and blades, wherein the hub and the blades jointly form an impeller system, the impeller system is an energy collecting part of a fan, and wind blows the impeller to rotate so as to drive a generator to generate electricity. The impeller rotates freely under the normal running mode of the fan, but the impeller is required to stop rotating when a unit fails or needs to be overhauled regularly, and the method comprises the following steps of high-speed shaft braking and impeller locking pin:

The high-speed shaft brake is a hydraulic brake arranged between the speed increasing gearbox of the fan and the generator, the impeller can be braked under normal conditions, but in the windy weather, the impeller is still at a rotating risk, the impeller can suddenly rotate under a braking state due to the reasons of aging and maintenance loss of a brake system and the like, and the high-speed shaft brake cannot be used as a main safety measure for overhauling in the hub.

The impeller lock pin is an impeller locking system independent of high-speed shaft braking, and consists of a locking disc fixed with a hub and a lock pin fixed with a cabin, a pin shaft of the lock pin is inserted into a locking hole of the hub locking disc, the impeller and the cabin are in a mechanical pin shaft connection state, and the impeller cannot rotate under the condition that the pin shaft is not broken or withdrawn. The diameter of the impeller lock pin is specially designed, so that the situation of shearing fracture cannot occur, but the situation of unexpected withdrawal of the lock pin is very common, and the main reasons are that the lock pin is extruded due to the swing of the impeller in windy weather, the withdrawal is caused due to the insufficient depth of the lock pin extending into the locking disc, the ejection force of the lock pin driving system cannot be maintained, and the like. The impeller may turn after the lock pin is withdrawn, which is a great hazard to the operator working in the hub, and may cause injury and loss of equipment.

At present, in order to prevent the impeller lock pin from withdrawing, a small bolt lock pin is additionally arranged at the rear end of the lock pin, and after the impeller lock pin is locked, a small thread lock pin at the rear end is screwed in to prevent the impeller lock pin from withdrawing. Although the small bolt lock pin at the rear end of the lock pin can be screwed in after the impeller lock pin is locked to prevent the lock pin from withdrawing, the lock pin is stressed very much after the impeller of the wind turbine generator is locked due to the large diameter of the impeller, and the force for withdrawing the lock pin is also very large at the same time, after the small bolt lock pin at the tail of the lock pin is screwed in, the small bolt lock pin is difficult to unscrew due to the large force, the operation is time-consuming and labor-consuming, the small thread lock pin is damaged and loses efficacy due to forced unscrewing, and the lock pin withdrawing risk cannot be defended.

Disclosure of Invention

In order to solve the technical problems or at least partially solve the technical problems, the invention provides a wind power impeller lock pin withdrawal alarm device.

The invention provides a wind power impeller lock pin exit alarm device which comprises a base, a displacement detection assembly and an alarm assembly, wherein the displacement detection assembly is arranged on the base, the base is used for being arranged on the hole wall of an impeller locking hole and supporting the displacement detection assembly at one end of an impeller lock pin shaft, the displacement detection assembly is used for detecting whether the position of the impeller lock pin shaft along the axial direction of the impeller lock pin shaft moves or not, and the alarm assembly can send an alarm according to a position movement signal fed back by the displacement detection assembly.

Optionally, a mounting block for mounting the displacement detection assembly is provided on the base, and the mounting block is configured to be movable along an axial direction of the impeller lock pin shaft.

Optionally, the base include be used for installing the bottom plate on the pore wall of impeller locking hole and with the fixed plate that the bottom plate interval set up, the bottom plate with connect through the guide post between the fixed plate, the guide post is followed the axial direction extension setting of impeller lock round pin axle, just the installation piece with guide post sliding fit.

Optionally, an adjusting rod is further rotatably arranged between the fixing plate and the bottom plate, and the adjusting rod penetrates through the mounting block and is in threaded fit with the mounting block.

Optionally, the end of the adjusting rod extends out of the fixing plate, and an adjusting knob is arranged at one end of the adjusting rod extending out of the fixing plate.

Optionally, a supporting block is arranged on the side surface of the mounting block, and the displacement detection assembly is arranged at the end part of the supporting block.

Optionally, a compression nut is further screwed on the periphery of the adjusting rod, and the compression nut is located above the mounting block.

Optionally, a magnet is arranged on the bottom plate, and the magnet can be adsorbed on the hole wall of the impeller locking hole.

Optionally, the base is configured to support the displacement detection assembly at the other end of the impeller lock pin in the withdrawal direction, and the displacement detection assembly is configured to send the position movement signal when the impeller lock pin is detected to be far away from the displacement detection assembly.

Optionally, the displacement detection assembly is connected with the alarm assembly through a cable.

Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following advantages:

According to the alarm device provided by the invention, the position of the impeller lock pin shaft is monitored through the displacement detection assembly to realize the exit alarm of the impeller lock pin shaft, so that the state monitoring of the impeller lock pin shaft is realized, the purpose of the exit alarm of the impeller lock pin shaft is achieved, when the impeller lock pin shaft has an exit phenomenon or exits a certain distance, the alarm assembly gives an alarm, an operator timely checks the state of the impeller lock pin shaft, further the impeller lock pin shaft is prevented from falling out, the phenomenon that the hub suddenly rotates is prevented from being found by the operator after the impeller lock pin shaft exits, and the operator can make countermeasures in advance according to the alarm, so that the safety risk is avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic structural view of a wind turbine lockpin exit alarm device according to an embodiment of the present invention;

FIG. 2 is a plan view of a wind turbine lockpin exit alarm device according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a side of the wind turbine blade lock pin exit alarm device provided with a displacement detection assembly according to an embodiment of the invention;

FIG. 4 is a plan view of one side of the wind turbine blade lock pin exit alarm device provided with a displacement detection assembly according to an embodiment of the invention;

FIG. 5 is a diagram showing a state of use of a wind-powered impeller lock pin exit alarm device with an impeller lock pin shaft in a half-locked state according to an embodiment of the present invention;

FIG. 6 is a view showing the state of the wind power impeller lock pin exit alarm device with the impeller lock pin shaft in the fully locked state according to the embodiment of the present invention.

Description of the reference numerals

1. A base; 11. a mounting block; 111. a support block; 12. a bottom plate; 13. a fixing plate; 14. a guide post; 141. a screw; 15. an adjusting rod; 151. an adjustment knob; 16. a compression nut; 2. a displacement detection assembly; 21. a sensor anti-loose gasket; 22. a sensor lock nut; 3. an alarm assembly; 31. protecting the box body; 32. an electric quantity indicator lamp; 33. a power switch; 34. an alarm lamp; 35. a battery compartment; 36. an alarm bell generation port; 4. a hole wall; 5. impeller lock pin shaft; 6. a cable.

Detailed Description

In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be made. The embodiments of the present invention and the features in the embodiments may be combined with each other without collision.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein; it is apparent that the embodiments in the specification are only some embodiments of the present invention, but not all embodiments.

In order to maintain convenience, the impeller lock pin shaft 5 is in the wind generating set, and needs to temporarily stop rotating the impeller of the set, and usually a corresponding impeller locking hole is formed between the impeller and the main frame, and the impeller and the base frame can be mutually locked by inserting the pin shaft into the impeller locking hole, so that the impeller lock pin shaft is a protection measure for preventing the impeller from rotating.

Referring to fig. 1 to 4, the wind power impeller lock pin exit alarm device provided by the embodiment of the invention comprises a base 1, a displacement detection assembly 2 and an alarm assembly 3, wherein the displacement detection assembly 2 is arranged on the base 1, the way that the displacement detection assembly 2 is arranged on the base 1 is not limited, and the device can be designed according to actual requirements. The base 1 is adapted to be mounted on the wall 4 of the impeller lock bore and to support the displacement sensing assembly 2 at one end of the impeller lock pin 5. The impeller lock pin shaft 5 is arranged in the impeller lock hole in a penetrating manner, the base 1 is arranged on the hole wall 4 of the impeller lock hole, preferably, the base 1 is arranged at the end part of the hole wall 4 of the impeller lock hole, the connection mode of the base 1 and the hole wall 4 of the impeller lock hole is not limited, the design can be carried out according to actual requirements, the displacement detection assembly 2 is arranged at one end of the impeller lock pin shaft 5 or a certain distance exists between the displacement detection assembly 2 and the end part of the impeller lock pin shaft 5, and the design is not limited. The displacement detection component 2 is used for detecting whether the position of the impeller lock pin shaft 5 along the axial direction of the impeller lock pin shaft 5 moves, and the alarm component 3 can send out an alarm according to a position movement signal fed back by the displacement detection component 2. The impeller lock pin shaft 5 is supported in the impeller lock hole through a hydraulic component, so that the impeller lock pin shaft 5 slowly withdraws when withdrawing from the impeller lock hole, and a certain operation time is reserved for a worker.

According to the alarm device provided by the invention, the position of the impeller lock pin shaft 5 is monitored through the displacement detection assembly 2 to realize the exit alarm of the impeller lock pin shaft 5, so that the state monitoring of the impeller lock pin shaft 5 is realized, the purpose of the exit alarm of the impeller lock pin shaft 5 is achieved, when the impeller lock pin shaft 5 has an exit phenomenon or exits for a certain distance, the alarm assembly 3 gives an alarm, an operator timely checks the state of the impeller lock pin shaft 5, further, the impeller lock pin shaft 5 is prevented from falling out, the phenomenon that the operator does not find a hub suddenly rotates after the impeller lock pin shaft 5 exits is prevented, the operator can make countermeasures in advance according to the alarm, and the safety risk is avoided.

In addition, this scheme simple structure, it is convenient simple to implement, and the device is portable effective, can be taken by the operating personnel, after impeller lock round pin axle 5 locking, adsorbs the device to corresponding position, open alarm switch can, trigger the warning after impeller lock round pin axle 5 withdraws from certain distance, in time the suggestion operating personnel withdraws from wheel hub, ensures staff's personal safety.

As shown in fig. 3, a mounting block 11 for mounting the displacement detection assembly 2 is arranged on the base 1 of the application, the mounting block 11 is arranged to be capable of moving along the axial direction of the impeller lock pin 5, and the displacement detection assembly 2 can be driven by the mounting block 11 to move along the axial direction of the impeller lock pin 5, so that the position of the displacement detection assembly 2 is changed, and the mounting block 11 can be supported at the end part of the impeller lock pin 5 to adapt to different locking states of the impeller lock pin 5.

As shown in fig. 5, when the impeller lock pin 5 is in the half-locked state, at this time, a certain distance exists between the impeller lock pin 5 and the end of the impeller lock hole, and the mounting block 11 drives the displacement detection assembly 2 to move towards the inside of the impeller lock hole, so that the displacement detection assembly 2 can be located at the end of the impeller lock pin 5.

As shown in fig. 6, when the impeller lock pin 5 is in the fully locked state, at this time, the end of the impeller lock pin 5 is flush with or exceeds the end of the impeller lock hole, and at this time, the mounting block 11 drives the displacement detection assembly 2 to move in an inner direction away from the impeller lock hole, so that the displacement detection assembly 2 can be located at the end of the impeller lock pin 5.

As shown in fig. 1 to 6, the base 1 comprises a bottom plate 12 for being mounted on the hole wall 4 of the impeller locking hole and a fixing plate 13 arranged at intervals with the bottom plate 12, the bottom plate 12 is connected with the fixing plate 13 through a guide post 14, the guide post 14 is arranged in an extending manner along the axial direction of the impeller locking pin 5, and the mounting block 11 is in sliding fit with the guide post 14. Specifically, two guide posts 14 are installed in parallel between the bottom plate 12 and the fixed plate 13, and both ends are fixed with screws 141, so that the installation block 11 can freely slide up and down on the guide posts 14. Under this kind of design mode, guide post 14 can play the guide effect for the removal of installation piece 11, ensures that installation piece 11 can be along the axial direction removal of impeller lock round pin axle 5, the accuracy of displacement detection subassembly 2 position adjustment of being convenient for.

An adjusting rod 15 is further rotatably arranged between the fixed plate 13 and the bottom plate 12, and the adjusting rod 15 penetrates through the mounting block 11 and is in threaded fit with the mounting block 11. Specifically, the adjusting lever 15 is also installed between the bottom plate 12 and the fixed plate 13, and the adjusting lever 15 is disposed in parallel with the guide posts 14, and both ends of the adjusting lever 15 are limited by locknuts, so that the adjusting lever 15 can only rotate relative to the fixed plate 13 and the bottom plate 12, but cannot move in the axial direction of itself relative to the fixed plate 13 and the bottom plate 12.

The installation piece 11 is embedded to have the nut, adjusts pole 15 for with nut assorted screw rod, the nut cover is established in the periphery of screw rod to can drive the nut through the rotation of screw rod and remove along the length direction of screw rod, and then make displacement detection subassembly 2 can follow installation piece 11 and remove, realize displacement detection subassembly 2's position control. The convenience and the accuracy of the position adjustment of the movement detection assembly can be improved in the design mode.

Further preferably, the end of the adjusting lever 15 protrudes out of the fixing plate 13, and one end of the adjusting lever 15 protruding out of the fixing plate 13 is provided with an adjusting knob 151. The staff can realize the rotation of adjusting lever 15 through operating adjust knob 151, and then accomplish the regulation of displacement detection subassembly 2 position, increase the convenience of staff's operation.

The side of the mounting block 11 is provided with a support block 111, and the displacement detection assembly 2 is provided at an end of the support block 111. By providing the support block 111, the displacement detection assembly 2 can be supported inside the impeller lock hole so that the displacement detection assembly 2 can be located at the end of the impeller lock pin shaft 5.

In some embodiments, the displacement detection assembly 2 is a proximity sensor, and the sensor is fixed to the support block 111 by using two sets of upper and lower sensor locking washers 21 and a sensor locking nut 22, where the sensor locking nut and the sensor locking washer 21 are designed in such a way as to firmly fix the sensor to the support block 111.

In some embodiments, the base 1 is configured to support the displacement detection assembly 2 at the other end of the impeller lock pin 5 in the withdrawal direction, and the displacement detection assembly 2 is configured to emit a position movement signal when the impeller lock pin 5 is detected to be away from the displacement detection assembly 2. That is, the receiving sensor will contact the end face of the impeller lock pin shaft 5, and after the impeller lock pin shaft 5 exits a certain distance, the receiving sensor sends out a position movement signal, and the alarm component 3 receives the position movement signal and alarms, wherein the manner of transmitting and receiving the signal is conventional in the art, and therefore, the description is not repeated here.

The connected sensor adopts a PNP type normally-closed sensor with 5V voltage power supply. The proximity sensor is a generic term for a sensor that performs detection without touching a detection object, instead of a contact detection system such as a limit switch. The movement information and the presence information of the detectable object are converted into electrical signals. The detection method of the electrical signal includes a method of utilizing eddy current generated in a metal body of a detection object caused by electromagnetic induction, a method of capturing capacity change of the electrical signal caused by proximity of the body, a method of leading to a switch, and a method of leading to a sensor of this kind, which is a conventional technology in the art, and therefore, the structure and specific operation principle thereof are not described in detail herein.

In other embodiments, the access sensor may be of other voltage specification types, such as 24V voltage, and the access sensor may also be a distance measuring sensor to realize the distance alarm function. Among them, the ranging sensor is an electrical element for calculating a distance between the ranging sensor and the measured object based on a difference between the transmitted signal and the recovered signal, and there are commonly an ultrasonic ranging sensor, an infrared ranging sensor, etc., and the ranging method is a conventional technology for those skilled in the art, so that the structure and the working principle thereof are not described too much.

In some embodiments, the outer circumference of the adjustment rod 15 is also screw-fitted with a compression nut 16, the compression nut 16 being above the mounting block 11. Specifically, the adjusting lever 15 is a screw, and the compression nut 16 is rotatably provided at the outer circumference of the adjusting lever 15 so that the compression nut 16 can be moved in the axial direction of the screw by the rotation of the compression nut 16. When the position of the mounting block 11 is adjusted, the compression nut 16 is moved in a direction away from the adjustment block by rotating the compression nut 16, at which time the position of the mounting block 11 is adjusted with the rotation of the adjustment lever 15. After the position of the installation block 11 is adjusted, the compression nut 16 is moved towards the direction of the adjusting block by rotating the compression nut 16, so that the compression nut 16 is compressed on the side face of the installation block 11, the position of the installation block 11 is prevented from moving, the displacement of the installation block 11 caused by long-time vibration is prevented, the position of the displacement detection assembly 2 is prevented from moving, and the accuracy of position monitoring of the displacement detection assembly 2 is ensured. The compression nut 16 may be a knurled hand-screwed nut, which increases convenience of operation of a worker.

The bottom plate 12 is provided with a magnet which can be adsorbed on the hole wall 4 of the impeller locking hole. When the magnetic type impeller lock is used, the bottom plate 12 is firmly adsorbed on the end part of the hole wall 4 of the impeller lock hole made of iron through the magnet, so that the displacement detection assembly 2 can be supported on the end part of the impeller lock pin shaft 5 through the support block 111, stable support is provided for the displacement detection assembly 2, and the magnetic connection mode increases the convenience of detachable connection between the bottom plate 12 and the hole wall 4 of the impeller lock hole. Specifically, the magnets are strong magnets to increase the firmness of the connection, and the magnets are embedded inside the bottom plate 12 to increase the convenience of magnet assembly.

The alarm device under the design mode adopts the access sensor as an alarm signal acquisition device, and simultaneously adopts the magnetic attraction base plate 12 to realize the rapid installation and the dismantling of the alarm device, so that the miniaturized and portable design can be carried about, the height of the access sensor can be adjusted, and the on-site use is convenient.

As shown in connection with fig. 1 to 6, the displacement detection assembly 2 and the alarm assembly 3 are connected by a cable 6. The alarm device and the base 1 adopt a split design mode under the design mode, so that the load of the base 1 can be effectively reduced, and the firmness degree of magnetic attraction connection between the base 1 and the hole wall 4 of the impeller locking hole is increased.

In some embodiments, the alarm assembly 3 is an audible and visual alarm, which is an alarm device that emits both audible and visual alarm signals, and the audible and visual alarm is a conventional technology in the art, so the structure and working principle thereof are not described herein too much. The protection box body 31 of audible and visual alarm is made by engineering plastics, has characteristics such as anti-falling, resistance to compression, resistant weather, and electric quantity indicator lamp 32 can show the electric quantity according to the quantity of bright lamp, and switch 33 button adopts embedded subsidence button, prevents the mistake touching, and alarm lamp 34 adopts high bright red flash light, can effectually provide warning signal, and alarm sound outlet embeds the tweeter, and protection box body 31 and tweeter corresponding position department are equipped with alarm sound generation mouth 36 to make alarm assembly 3 can provide warning signal in noisy environment, and audible and visual alarm's the back is equipped with battery compartment 35, can adorn four five batteries, and whole system 5V power supply guarantees the power consumption safety. The alarm assembly 3 uses 5V power supply, and has the advantages of miniaturization, portability and the like.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a wind-powered electricity generation impeller lockpin withdraws from alarm device, its characterized in that includes base (1), displacement detection subassembly (2) and alarm component (3), displacement detection subassembly (2) set up on base (1), base (1) are used for installing on pore wall (4) of impeller locking hole and will displacement detection subassembly (2) support the one end at impeller lock round pin axle (5), displacement detection subassembly (2) are used for detecting whether impeller lock round pin axle (5) are along the position of the axial direction of impeller lock round pin axle (5) takes place to remove, alarm component (3) can be according to the position movement signal of displacement detection subassembly (2) feedback sends out the alarm.

2. Wind-powered impeller lock pin withdrawal alarm device according to claim 1, characterized in that the base (1) is provided with a mounting block (11) for mounting the displacement detection assembly (2), which mounting block (11) is arranged to be movable in the axial direction of the impeller lock pin shaft (5).

3. Wind power impeller lock pin exit alarm device according to claim 2, characterized in that the base (1) comprises a bottom plate (12) for being mounted on the hole wall (4) of the impeller locking hole and a fixed plate (13) arranged at intervals with the bottom plate (12), the bottom plate (12) and the fixed plate (13) are connected through a guide post (14), the guide post (14) is arranged in an extending manner along the axial direction of the impeller locking pin shaft (5), and the mounting block (11) is in sliding fit with the guide post (14).

4. A wind-powered impeller lock pin withdrawal alarm device according to claim 3, characterized in that an adjusting rod (15) is further rotatably arranged between the fixed plate (13) and the bottom plate (12), and the adjusting rod (15) passes through the mounting block (11) and is in threaded fit with the mounting block (11).

5. Wind-powered impeller lock pin withdrawal alarm device according to claim 4, characterized in that the end of the adjusting lever (15) protrudes out of the fixed plate (13), and that the end of the adjusting lever (15) protruding out of the fixed plate (13) is provided with an adjusting knob (151).

6. Wind-powered impeller lock pin exit alarm device according to claim 2, characterized in that the side of the mounting block (11) is provided with a support block (111), the displacement detection assembly (2) being arranged at the end of the support block (111).

7. Wind-powered impeller lock pin withdrawal alarm device according to claim 4, characterized in that the outer circumference of the adjustment rod (15) is also screw-fitted with a compression nut (16), the compression nut (16) being above the mounting block (11).

8. A wind-powered impeller lock pin exit warning device according to claim 3, characterised in that the base plate (12) is provided with a magnet which can be attracted to the wall (4) of the impeller locking hole.

9. Wind power impeller lock pin exit warning device according to claim 1, characterized in that the base (1) is adapted to support the displacement detection assembly (2) at the other end of the exit direction of the impeller lock pin shaft (5), the displacement detection assembly (2) being arranged to emit the position movement signal when it is detected that the impeller lock pin shaft (5) is remote from the displacement detection assembly (2).

10. Wind turbine lockpin exit warning device according to claim 1, characterized in that the displacement detection assembly (2) is connected with the warning assembly (3) by means of a cable (6).