Once switched to the fire elevator running state, then it is automatically canceled the normal operating state ; opposite the elevator running in firefighting , if not through the fire switch conversion, it is not likely to enter the normal operating state . We also know that the normal operation of the elevator is dependent on the door switch circuit and the safety circuit is closed ; under normal operating conditions , the ladder lock key must also be able to play the role off ( normally been executed within the selected instruction, the return station , after a few seconds automatically shut ladder ) but under Fire running, ladder lock and can not play off- key role, but this time the elevator is also showing a canceled outgoing calls, the election " one-off" features straight ahead , which is regulatory issues we are talking about firefighting operation. So we said , Fire running higher level than a normal operating state . If we clarify the specification of various operating states of the elevator , and the level of various forms were running a sort, then we not only conducive to knowledge and understanding of the elevator , but also for the maintenance and operation of the elevator will be able to diagnose plays very good guidance , this is the conception and the intention of this article.
In general , each elevator so that at least three kinds of running form: namely, normal operation , fire operation, maintenance operation. GB and knowledge from the elevator to scrutiny, these three forms also runs its own characteristics and requirements ( ie specifications ) , if the in-depth study of scrutiny, we will find that there are also significant problems sorting between three forms, That is not flat from the flat seat between them , but there is a clear level of problems . From level point of view, these three running form, running low , the highest run maintenance , fire running row two . Below, we analyze specification forms from each run , we not only able to clearly recognize the level between them, but also a good understanding and grasp the characteristics of each operation specification form .
We take a look at maintenance operation specifications. GB7588-1995 in 14.2.1.3 ( inspection operation ) states: In order to facilitate inspection and maintenance should be installed in the car top an easily accessible control device . The device should be a switch to meet the requirements of electrical safety devices 14.1.2 (the inspection operation switch ) operation.
The switch should be bistable and misuse of protection should be provided . And should meet the following conditions :
a) Upon entering the maintenance repair operation should be canceled : ① normal operation , including the operation of any automatic doors ; ② emergency electrical operation ( see 14.2.1.4); ③ docking operation and running ( see 14.2.1.5).
Only operate overhaul switch again to resume normal operation of the elevator . If the withdrawal of the conversion device is not running and maintenance of mechanical switch contacts consisting of one of the security measures should be taken , including a failure of proof on 14.1.1.1 lists when all the car 's malfunction in the circuit .
b) should rely on the car to run a sustained push buttons , to prevent misuse , and to indicate the direction .
c) control device shall include a stop device 14.2.2 comply with regulations.
d) the speed of the car should be less than 0.63m / s.
e ] the car should not exceed the normal range of travel .
f) operation of the lift should still rely on safety devices.
Control devices can also work with special switches together to prevent the bridge from the top of the door body movements to control misuse .
GB/T10058-1997 " elevator technology" Article 3.3.9 g) provides that: car roof should be installed to run a repair device , such as the car , the engine room also has a maintenance operation of the device , make sure that the car top priority .
This is the overhaul running the most accurate and complete specification , we can clearly see from this specification , as long as the elevator switch to run the state , what is the normal operation , emergency operation , all the docking operation fails , the switch would not have even laid Fire What role . Under the overhaul running, you can venture operations, say nothing to worry about locking the keys off the ladder and fire caused by switching operation of the elevator , because the maintenance operation is the highest level. Only undo maintenance operation , elevator to make the elevator run into other forms .
We know that in the elevator use, safety of maintenance personnel are vulnerable , and therefore also to maximize the specification to ensure their safety . Specification a) establish a level position overhaul operation. Guard against all dangers during maintenance operation may occur , and with strict technical specifications shall be guaranteed.
Let us look at specifications Fire runs. Generally , fire control elevators because of the different countries and regions fire codes vary , and some may also be due to the differences in function even in the same area of the building , fire levels, and base stations. But no matter how , after switching Fire , Elevator bottom or base station should be returned immediately to meet the requirements of the Fire workpiece. For this control system should achieve : ① After Fire switch elevator no longer answer lay in the car in order to summon the outer layer of the signal and the signal ; ② is upward lift to an emergency stop , the speed ≥ 1.0m / s elevator first gear and then stop, and the parking is not allowed to open the door ; ③ is downward elevator , halfway no longer respond to any outside call and execute instructions in the car but straight Scientology site . Subject to return to the basic lift station after running into the Fire , the control system should be able to do : ① only response command signal in the car , without answering the call signal landing outside and inside the car instruction execution are " one-off "; ② automatic switching function doors disappear into the jog operation. In addition to the various types of door protection safety devices still work. When the Fire switch recovery should be immediately transferred to a normal elevator operation , which is the basic feature Fire runs.
We can see from this specification , fire runs can immediately cancel the disappearance of the normal operation of the elevator , it can turn off the key role of the electric lock ladder failure ( even if under lock staircase elevator in the state , without elevator key switches also enable the Fire Fire elevator into operation ) , but " in addition to all kinds of door protection safety devices still work ," so it is only higher than normal operation. It is obviously lower than the elevator emergency operation in the emergency electrical operation , even lower than the maintenance operation of the lift.
Ladder in the elevator lock state , no elevator key , Fire switch also allows the state to run the elevator into the Fire , which is required for fire fighting work, but also the designer elevator issues are taken into account , but almost all of the books in the interpretation of professional firefighting operation when it ignores the operational safety of the use of fire protection , fire protection that is running the elevator specification there is little inadequate. Once we know the elevator will have run into the fire : the response of the car within an instruction signal outside the landing call without answering signal and the instruction is executed in the car , " disposable" ; 2 ) automatic doors function disappears jog run into , in addition to all kinds of door protection device safety devices still work. When the Fire switch recovery should be immediately transferred to a normal elevator operation , which is the basic feature Fire runs. We imagine a fire has occurred, a firefighter was ordered to pick up a top-secret document , 21st Floor , will not appear in the process he took the documents , others went into the car to open the escape , and he took the top-secret documents to return 21st floor of the scene, but do not do anything ? Such speculation is likely to be established and therefore at this critical moment of urgent task must be two people : one person to accomplish specific tasks ; another person in charge of guarding and control the elevator . This one should be written firefighting operations specifications .
From running morphological point of view, there are two elevators were less common and less well-known running form: emergency electrical operation and docking operations running .
GB7588-1995 specification 14.2.1.4 emergency electrical operation of emergency electrical operation control provisions : the human operator to improve the car for more than the rated load of the elevator drive host 400N , should be set in line with 14.1.2 of an emergency electrical operation switch its engine room. Lift the drive by the host or from the normal power supply backup power supply ( if any ) .
14.2.1.4.1 should be allowed to operate emergency electrical operation switch from the engine room , all by the press to prevent misuse of the push-button control of the car continued to run .
After 14.2.1.4.2 emergency electrical operation switch operation , except by the switching control should prevent the car everything is running .
14.2.1.4.3 emergency electrical operation switch itself or through another electrical safety device allowing 9.9.11.1 and electrical safety devices required for the governor 's 9.9.11.2 failure .
14.2.1.4.4 emergency electrical operation switch itself or through another electrical safety device allowing the following electrical safety device failure :
a) electrical safety devices on 9.8.8 safety gear unit ;
b) electrical safety devices 10.4.3.4 buffer on ;
c) 10.5 limit switch .
14.2.1.4.5 emergency electrical operation switch and manipulate buttons should be set when using direct observation elevator drive host place.
14.2.1.4.6 car running speed should be less than 0.63m / s.
GB7588-1995 specification elevator docking operation running 14.2.1.5 of docking operation run states:
For the special case of 7.7.2.2 b) of the mentioned , and meet the following conditions before allowing the car to run at the time of the landing door and car door opened, and a trained user to approve the elevator loading and unloading and docking operations :
a) the car can not be run in the region 1.6 5m in the corresponding leveling position on behalf of the above.
b) by a car running 14.1.2 character orientation required electrical safety devices limit .
c) shall not exceed the speed of running speed O. 3m / s.
d) Only open the docking operation layer side door and car door ( if available).
e) from the docking operation of the control position should be clearly visible region of operation.
f) only after the safety function key operation for contact before docking operation. This key is only cut off when docked in the operating position , in order to pull out .
g) the operation of the security key switch contact action :
① should make the normal control failure . If it is not big and the total effect of the switch contacts of key institutions operating one of the safety contacts , should take measures to prevent the listed 14.1.1.1 of failure when one car in the circuit and run error . ② should only be used for continuous batch press the button to make the car run , the direction of the car should be marked . ③ key switch itself or by another electrical safety device meets the requirements of 14.1.2 , make the following example device failure : Electrical safety devices corresponding landing door lock device ; verify the status of the corresponding layer door closed electrical safety devices ; verify the docking operation entrance to the car door closed condition of electrical safety devices.
h) Maintenance Once access, the docking failure.
i) There should be a stop device inside the car .
Although the author for an elevator from the emergency electrical operation and docking operations to run and do not have much experience , but the combination of emergency electrical operation and use of the docking operation running , and consider the achievement of these two kinds of running , and then carefully weigh these two deeply specification , we can assume emergency electrical operation and docking operation is not entirely dependent on running the entire safety loop and closed loop locks . They should also be higher than the level of fire protection to run , but they should also be less than the maintenance operation. Emergency power operation and docking operations should run third and fourth place , respectively , in the normal run , run after the Fire , located overhaul before running .