CN112061926A - Preventive detection and maintenance method for elevator - Google Patents
Preventive detection and maintenance method for elevator Download PDFInfo
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- CN112061926A CN112061926A CN202010912997.3A CN202010912997A CN112061926A CN 112061926 A CN112061926 A CN 112061926A CN 202010912997 A CN202010912997 A CN 202010912997A CN 112061926 A CN112061926 A CN 112061926A
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- elevator
- door
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- relay
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
- B66B13/02—Door or gate operation
- B66B13/14—Control systems or devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/14—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of excessive loads
- B66B5/145—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of excessive loads electrical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/12—Checking, lubricating, or cleaning means for ropes, cables or guides
- B66B7/1207—Checking means
- B66B7/1215—Checking means specially adapted for ropes or cables
- B66B7/1238—Checking means specially adapted for ropes or cables by optical techniques
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
The invention provides a preventive maintenance method for an elevator, which comprises the following steps: earlier to the loading capacity detection in the elevator, install a bottom plate that has pressure sensor on the inside bottom plate of elevator, slowly stand the people on the bottom plate, on each secondary station alone, pressure sensor all can show the loading capacity, when the people of going up reports to the police to the elevator, notes the pressure reading, detects the acceleration of elevator, carries an acceleration sensor to the elevator on, the test rises, descends and the floor stops acceleration between, accomplishes the acceleration and detects. The invention can finish the load detection, the acceleration detection, the leveling detection and the steel wire rope detection of the elevator by using a simple method, is favorable for knowing the internal condition of the elevator, can quickly process the abnormal condition if the abnormal condition occurs, avoids major faults occurring in the elevator, and simultaneously effectively detects and processes some common faults of the elevator door by using different methods to comprehensively and preventively detect the elevator.
Description
Technical Field
The invention relates to the technical field of elevator preventive detection, in particular to an elevator preventive detection and maintenance method.
Background
The elevator is a lifting structure, can drive goods and people and improve the structure to a certain eminence, and the appearance of elevator can save the time that people climbed the building, has practiced thrift the time of arriving the floor, and also can make people save physical power more and arrive the floor, very big life that has made things convenient for people.
When the elevator runs, various faults occur, and in order to avoid the bad influence of the faults on the life and work of people, the elevator needs to be regularly and preventively detected.
However, the existing elevator detection methods are generally too simple, and generally detect the elevator in a checking mode, and the method generally can only detect and troubleshoot external faults of the elevator, cannot rapidly detect and process internal faults of the elevator, and cannot achieve the purpose of preventive detection.
Disclosure of Invention
Based on this, the invention aims to solve the problems that the existing elevator detection method is generally too simple in the prior art, and the elevator is generally detected in a checking mode, the method can only detect and investigate the external fault of the elevator generally, can not quickly detect and process the fault in the elevator, and can not achieve the purpose of preventive detection.
The invention provides elevator preventive detection, which is used for carrying out preventive detection on an elevator and comprises the following detection steps: the method comprises the following steps of load capacity detection of the elevator, acceleration detection of the elevator, leveling detection of the elevator, steel wire rope detection and elevator door fault detection.
The invention also provides a preventive maintenance method of the elevator, which comprises the following steps:
s1, firstly, aiming at the load capacity detection of the elevator, installing a bottom plate with a pressure sensor on an internal bottom plate of the elevator, and slowly standing people on the bottom plate;
s2, when a person at each secondary station, the pressure sensor displays the load capacity, and the pressure reading is recorded until the person reaches the elevator to alarm;
s3, detecting the acceleration of the elevator, carrying an acceleration sensor to the elevator, testing the acceleration between rising and falling and floor stopping, and completing the acceleration detection;
s4, detecting the leveling degree of the elevator, placing a horizontal ruler between the elevator and an outer layer when the elevator stops at a floor, and observing the liquid condition in the horizontal ruler to judge the leveling degree of the elevator;
s5, detecting the steel wire rope, entering the elevator top, illuminating each part of the steel wire rope by using a strong light lamp, and observing whether cracks exist or not;
s6, elevator door failure is detected, if the elevator stops suddenly during running, a door knife is used for colliding a door wheel, a lock arm is disengaged, a door lock switch KMT is disconnected, a door lock relay JMS is powered off, the elevator stops immediately, and the positions of the door lock roller and the door knife are adjusted;
s7, if the elevator does not open the door after arriving at the floor, enabling the door opening relay JKM not to be powered, the elevator cannot open the door, and checking and determining two short-circuit points;
s8, a permanent magnet relay (commonly called a reed switch) in the door opening area is damaged, so that the door opening control relay JMQ cannot be attracted, a normally open contact of the door opening control relay is still disconnected, the relay JKM cannot be electrified and cannot be opened, and the permanent magnet relay in the door opening area is replaced;
s9, if the button is pressed down and the door is not closed, the AGM contact of the door closing button is poor in contact or damaged, two points of short circuit are checked and determined, and then the door is repaired or replaced;
s10, the three-stage door closing limit switch 3GM is damaged, so that the door closing relay JGM cannot be powered on, the elevator cannot be closed, two points of short circuit are checked and determined, the door can be closed, the damage of the 3GM is indicated, and the 3GM is replaced;
s11, replacing the door closing relay JGM when damaged JGM;
s12, if the door closing speed is unchanged, the first-stage and second-stage door closing limit switches 1GM and 2GM are damaged, and 1GM and 2GM are replaced;
s13, when the elevator is subjected to a floor instruction, the door can be closed but cannot be lifted, the car door is closed in place, but the car door interlocking switch KMJ is not switched on, and the door lock relay JMS cannot be powered, so that the switch KMJ cannot be started, adjusted or replaced;
s14, if the hall door is not closed in place, the hall door interlocking switch KMT cannot be switched on, the door lock relay JMS cannot be powered on, so that the hall door cannot be started, and the door is re-opened and closed, and if the hall door is not operated, the door speed or the door lock switch KMT is adjusted;
s15, when the door is closed in place, the door lock switch KMT breaks down, the door lock is removed or replaced, the operation relay JYT breaks down, and the JYT is repaired or replaced;
s16, when detection is carried out, the security system can work and comprises a face recognition module, an expression analysis module and an alarm module which are connected in sequence; the face recognition module is connected with a camera in the elevator to acquire a face image from a picture shot by the camera in the elevator and send the face image to the expression analysis module, the expression analysis module analyzes the expression presented by the face image and sends an alarm signal to the alarm module when the analysis result is abnormal expression, and the alarm module is connected with an external monitor and executes alarm action in the external monitor and the elevator car after receiving the alarm signal.
In practical application, the elevator preventive maintenance method provided by the invention can be used for completing the load detection, the acceleration detection, the floor leveling detection and the steel wire rope detection of the elevator by using a simple method, is favorable for knowing the internal condition of the elevator, can be used for rapidly processing the abnormal condition, avoids the problem detention, avoids major faults in the elevator and ensures safety, and meanwhile, different methods are used for effectively detecting and processing common faults of the elevator door to complete comprehensive preventive detection of the elevator.
In the method for detecting and maintaining the elevator in a preventive manner, in the step S2, the person who is just added is removed, the pressure reading which does not give an alarm is recorded, and the maximum load capacity interval of the elevator is obtained.
In the method for preventive detection and maintenance of an elevator, in S4, if the liquid in the level is in a state of a horizontal liquid level, it is determined that the elevator is good in leveling level, and if the liquid in the level is in a state of a diagonal liquid level, it is determined that the elevator is poor in leveling level.
In the method for preventive detection and maintenance of the elevator, in the step S7, two short-circuit points 38 and 01 are checked and determined, if the door can be opened, 2KM is damaged, and 2KM is replaced.
The elevator preventive detection and maintenance method, wherein in the S9, two short-circuit points 23 and 24 are checked and measured.
The elevator preventive detection and maintenance method comprises the step of S10, and the short circuit 28 and the short circuit 01 are detected and measured at two points.
According to the elevator preventive detection and maintenance method, in S11, when the door opening relay 1JQ is restarted and damaged, the normally open contact 1JQ is still disconnected, JGM cannot be powered on, so that the door cannot be closed, and the relay 1JQ is replaced.
In the preventive detection and maintenance method for an elevator, in S12, the closing shunt resistor RGM is disconnected and disconnected, and the resistor RGM is replaced.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
Detailed Description
The present invention will be described more fully hereinafter to facilitate an understanding of the invention. Preferred embodiments of the present invention are given. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The existing elevator detection method is generally too simple, generally detects an elevator in a checking mode, generally can only detect and investigate external faults of the elevator, cannot rapidly inspect and process faults inside the elevator, and cannot achieve the purpose of preventive detection.
In order to solve the problem, the invention provides elevator preventive detection which is used for carrying out preventive detection on an elevator, and the elevator preventive detection provided by the embodiment of the invention comprises the following detection steps: detecting the load capacity of the elevator, detecting the acceleration of the elevator, detecting the leveling degree of the elevator, detecting a steel wire rope and detecting the fault of an elevator door;
the invention also provides a preventive maintenance method of the elevator, which comprises the following steps:
s1, firstly, aiming at the load capacity detection of the elevator, installing a bottom plate with a pressure sensor on an internal bottom plate of the elevator, and slowly standing people on the bottom plate;
s2, when a person at each secondary station sends an alarm, the pressure sensor displays the load capacity, and when the person sends the alarm to the elevator, the pressure reading is recorded, the person who has just added the elevator is removed, the pressure reading which does not send the alarm is recorded, and the maximum load capacity interval of the elevator is obtained;
s3, detecting the acceleration of the elevator, carrying an acceleration sensor to the elevator, testing the acceleration between rising and falling and floor stopping, and completing the acceleration detection;
s4, detecting the leveling degree of the elevator, placing a level bar between the elevator and an outer layer when the elevator stops at a floor, observing the liquid condition in the level bar to judge the leveling degree of the elevator, if the liquid in the level bar is in a state of a horizontal liquid level, indicating that the leveling degree of the elevator is good, and if the liquid in the level bar is in a state of an inclined liquid level, indicating that the leveling degree of the elevator is poor;
s5, detecting the steel wire rope, entering the elevator top, illuminating each part of the steel wire rope by using a strong light lamp, and observing whether cracks exist or not;
s6, elevator door failure is detected, if the elevator stops suddenly during running, a door knife is used for colliding a door wheel, a lock arm is disengaged, a door lock switch KMT is disconnected, a door lock relay JMS is powered off, the elevator stops immediately, and the positions of the door lock roller and the door knife are adjusted;
s7, if the elevator does not open the door after arriving at the floor, enabling the door opening relay JKM not to be powered, the elevator cannot open the door, the two short-circuit points 38 and 01 are checked and determined, and if the elevator can open the door, 2KM is damaged, and 2KM is replaced;
s8, a permanent magnet relay (commonly called a reed switch) in the door opening area is damaged, so that the door opening control relay JMQ cannot be attracted, a normally open contact of the door opening control relay is still disconnected, the relay JKM cannot be electrified and cannot be opened, and the permanent magnet relay in the door opening area is replaced;
s9, if the button is pressed down and the door is not closed, the AGM contact of the door closing button is poor in contact or damaged, the two short-circuit points 23 and 24 are detected and measured, and then the door is repaired or replaced;
s10, the three-level door closing limit switch 3GM is damaged, so that the door closing relay JGM cannot be powered on, the elevator cannot be closed, the short circuit 28 and 01 are checked and determined at two points, the door can be closed, the damage of the 3GM is indicated, and the 3GM is replaced;
s11, the door closing relay JGM is damaged and replaced by JGM, the door opening relay 1JQ is restarted and damaged, the normally open contact 1JQ is still disconnected, JGM cannot be electrified, so that the door cannot be closed, and the relay 1JQ is replaced;
s12, if the door closing speed is unchanged, the first-stage and second-stage limit switches 1GM and 2GM of the door closing are damaged, the 1GM and the 2GM are replaced, the shunt resistor RGM of the door closing is disconnected, and the resistor RGM is replaced;
s13, when the elevator is subjected to a floor instruction, the door can be closed but cannot be lifted, the car door is closed in place, but the car door interlocking switch KMJ is not switched on, and the door lock relay JMS cannot be powered, so that the switch KMJ cannot be started, adjusted or replaced;
s14, if the hall door is not closed in place, the hall door interlocking switch KMT cannot be switched on, the door lock relay JMS cannot be powered on, so that the hall door cannot be started, and the door is re-opened and closed, and if the hall door is not operated, the door speed or the door lock switch KMT is adjusted;
s15, when the door is closed in place, the door lock switch KMT breaks down, the door lock is removed or replaced, the operation relay JYT breaks down, and the JYT is repaired or replaced;
s16, when detection is carried out, the security system can work and comprises a face recognition module, an expression analysis module and an alarm module which are connected in sequence; the face recognition module is connected with a camera in the elevator to acquire a face image from a picture shot by the camera in the elevator and send the face image to the expression analysis module, the expression analysis module analyzes the expression presented by the face image and sends an alarm signal to the alarm module when the analysis result is abnormal expression, and the alarm module is connected with an external monitor and executes alarm action in the external monitor and the elevator car after receiving the alarm signal.
In practical application, the elevator preventive maintenance method provided by the invention can be used for completing the load detection, the acceleration detection, the floor leveling detection and the steel wire rope detection of an elevator by using a simple method, is favorable for knowing the internal condition of the elevator, can be used for rapidly processing the abnormal condition, avoids problems from being detained, avoids major faults in the elevator and ensures safety, and meanwhile, effectively detects and processes some common faults of the elevator door by using different methods to complete the comprehensive preventive detection of the elevator.
In this embodiment, earlier to the loading capacity detection in elevator, install a bottom plate that has pressure sensor on the inside bottom plate of elevator, slowly stand people on the bottom plate, on each secondary station alone, pressure sensor all can show the loading capacity, when up people to the elevator warning, note down the pressure reading, will just add the people and remove, note the pressure reading that does not report to the police, obtain the elevator maximum loading capacity interval, accomplish the loading capacity testing process to the elevator, can obtain maximum loading capacity.
In this embodiment, the acceleration of the elevator is detected, an acceleration sensor is carried to the elevator to test the acceleration between the rise and the fall and the floor stop, the acceleration detection is completed, the rise and fall acceleration of the elevator is detected, and whether the elevator goes up and down or not can be obtained.
In this embodiment, detect the flat bed degree of elevator, when the elevator was berthhed at the floor, place the horizon between elevator and skin with the level bar, observe the liquid condition in the horizon, judge the flat bed degree of elevator, if the liquid in the horizon is in the state of horizontal liquid level, then explain the flat bed degree of elevator good, if the liquid of horizon is in the state of sloping liquid level, explain the flat bed degree of elevator relatively poor, can detect the flat bed degree of elevator fast, detect rapidly.
In this embodiment, detect wire rope, in going into the elevator top, utilize the highlight lamp to shine each part of wire rope, observe whether there is the condition of crack, the condition of the wire rope of observation elevator that can be quick, take place to have the flaw to change immediately, guarantee the absolute safety of elevator operation.
Wherein, the above-mentioned elevator door fault is detected, if the elevator stops suddenly in the driving, use the door knife to collide with the door wheel, make the lock arm throw off, the door lock switch KMT breaks off, the door lock relay JMS loses the electricity, the elevator stops immediately, adjust the position of door lock roller and door knife, if after arriving the floor, the elevator does not open the door, make the relay JKM of opening the door unable to get electricity, the elevator can't open the door, the short circuit two points 38, 01 check confirm, if can open the door, explain 2KM is damaged, change 2KM, open the door area permanent magnetic relay (commonly known as tongue tube) is damaged, make the control relay JMQ of opening the door unable to close, its normally open contact still breaks off, the relay JKM can't get electricity, but can't open the door, change the permanent magnetic relay of opening the door area, if press the button, the door is not closed, the AGM contact of the door closing, the three-level door-closing limit switch 3GM is damaged, so that a door-closing relay JGM cannot be powered on, the elevator cannot be closed, two-point inspection and measurement of short circuits 28 and 01 can be performed, the door can be closed, the 3GM is explained to be damaged, the 3GM is replaced, the door-closing relay JGM is damaged, the JGM is replaced, the door-opening relay 1JQ is restarted to be damaged, the normally-open contact 1JQ is still disconnected, the JGM cannot be powered on, so that the door cannot be closed, the relay 1JQ is replaced, if the door-closing speed is unchanged, the door-closing first-level limit switch 1GM and the second-level limit switch 2GM are damaged, the 1GM and the 2GM are replaced, the door-closing shunt resistor RGM is disconnected and disconnected, the replacing resistor RGM, the elevator is instructed by a floor, the door can be closed but cannot be lifted, the car door is closed in place, but the car door interlock switch KMJ is not switched on, the door-lock relay JMS cannot, the door lock relay JMS can not be powered on, so that the door can not be started and opened again, if the door is not effective, the door speed or the door lock switch KMT is adjusted, the door is closed in place, but the door lock switch KMT is in failure, the door lock is removed or replaced, the operation relay JYT is in failure, and the JYT is repaired or replaced.
The elevator preventive maintenance method can complete the load detection of the elevator, the acceleration detection of the elevator, the flatness detection of the elevator and the steel wire rope detection by using a simple method, can help to know the internal condition of the elevator, can quickly process the abnormal condition, avoids the problem detention, avoids the serious fault in the elevator, ensures the safety, meanwhile, different methods are utilized to effectively detect and process some common faults of the elevator door, complete comprehensive preventive detection of the elevator, and by arranging a security system, namely a face recognition module, an expression analysis module and an alarm module, can analyze the expression of a user through the expression analysis module when a hijack phenomenon occurs in the elevator car, therefore, whether the user is abnormal or not is judged, the safety of taking the elevator by the user is further ensured, and the occurrence of violent events in the elevator is avoided.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. An elevator preventive detection, characterized in that: the method comprises the following detection steps: the method comprises the following steps of load capacity detection of the elevator, acceleration detection of the elevator, leveling detection of the elevator, steel wire rope detection and elevator door fault detection.
2. Method for preventive maintenance of an elevator according to claim 1, characterized in that it comprises the following steps:
s1, firstly, aiming at the load capacity detection of the elevator, installing a bottom plate with a pressure sensor on an internal bottom plate of the elevator, and slowly standing people on the bottom plate;
s2, when a person at each secondary station, the pressure sensor displays the load capacity, and the pressure reading is recorded until the person reaches the elevator to alarm;
s3, detecting the acceleration of the elevator, carrying an acceleration sensor to the elevator, testing the acceleration between rising and falling and floor stopping, and completing the acceleration detection;
s4, detecting the leveling degree of the elevator, placing a horizontal ruler between the elevator and an outer layer when the elevator stops at a floor, and observing the liquid condition in the horizontal ruler to judge the leveling degree of the elevator;
s5, detecting the steel wire rope, entering the elevator top, illuminating each part of the steel wire rope by using a strong light lamp, and observing whether cracks exist or not;
s6, elevator door failure is detected, if the elevator stops suddenly during running, a door knife is used for colliding a door wheel, a lock arm is disengaged, a door lock switch KMT is disconnected, a door lock relay JMS is powered off, the elevator stops immediately, and the positions of the door lock roller and the door knife are adjusted;
s7, if the elevator does not open the door after arriving at the floor, enabling the door opening relay JKM not to be powered, the elevator cannot open the door, and checking and determining two short-circuit points;
s8, a permanent magnet relay (commonly called a reed switch) in the door opening area is damaged, so that the door opening control relay JMQ cannot be attracted, a normally open contact of the door opening control relay is still disconnected, the relay JKM cannot be electrified and cannot be opened, and the permanent magnet relay in the door opening area is replaced;
s9, if the button is pressed down and the door is not closed, the AGM contact of the door closing button is poor in contact or damaged, two points of short circuit are checked and determined, and then the door is repaired or replaced;
s10, the three-stage door closing limit switch 3GM is damaged, so that the door closing relay JGM cannot be powered on, the elevator cannot be closed, two points of short circuit are checked and determined, the door can be closed, the damage of the 3GM is indicated, and the 3GM is replaced;
s11, replacing the door closing relay JGM when damaged JGM;
s12, if the door closing speed is unchanged, the first-stage and second-stage door closing limit switches 1GM and 2GM are damaged, and 1GM and 2GM are replaced;
s13, when the elevator is subjected to a floor instruction, the door can be closed but cannot be lifted, the car door is closed in place, but the car door interlocking switch KMJ is not switched on, and the door lock relay JMS cannot be powered, so that the switch KMJ cannot be started, adjusted or replaced;
s14, if the hall door is not closed in place, the hall door interlocking switch KMT cannot be switched on, the door lock relay JMS cannot be powered on, so that the hall door cannot be started, and the door is re-opened and closed, and if the hall door is not operated, the door speed or the door lock switch KMT is adjusted;
s15, when the door is closed in place, the door lock switch KMT breaks down, the door lock is removed or replaced, the operation relay JYT breaks down, and the JYT is repaired or replaced;
s16, when detection is carried out, the security system can work and comprises a face recognition module, an expression analysis module and an alarm module which are connected in sequence; the face recognition module is connected with a camera in the elevator to acquire a face image from a picture shot by the camera in the elevator and send the face image to the expression analysis module, the expression analysis module analyzes the expression presented by the face image and sends an alarm signal to the alarm module when the analysis result is abnormal expression, and the alarm module is connected with an external monitor and executes alarm action in the external monitor and the elevator car after receiving the alarm signal.
3. Method for preventive maintenance of an elevator according to claim 2, characterized in that in S2 the person who has just added is removed and the pressure readings that do not give an alarm are recorded, resulting in an elevator maximum load interval.
4. The elevator preventive detection and maintenance method according to claim 2, wherein in S4, if the liquid in the level is in a state of a horizontal liquid level, it indicates that the elevator is good in leveling, and if the liquid in the level is in a state of a diagonal liquid level, it indicates that the elevator is poor in leveling.
5. A preventive maintenance method for an elevator according to claim 2, characterized in that in S7, the two short-circuit points 38 and 01 are checked to determine that 2KM is damaged and replaced with 2KM if the door can be opened.
6. Method for preventive maintenance of an elevator according to claim 2, characterized in that in S9 the short-circuited two points 23, 24 are examined.
7. Method for preventive maintenance of an elevator according to claim 2, characterized in that in S10 the short circuit 28, 01 is checked and determined at two points.
8. The preventive maintenance method for elevator according to claim 2, characterized in that in S11, when the re-starting door-opening relay 1JQ is damaged, the normally open contact 1JQ is still open, JGM cannot get power, so that the door cannot be closed, and the relay 1JQ is replaced.
9. The preventive maintenance method for an elevator according to claim 2, wherein in S12, the closing shunt resistor RGM is disconnected and disconnected, and the resistor RGM is replaced.
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