A power plant boiler inspection elevator safety device modification and inspection method

Abstract

The present invention discloses a method for modifying and testing the safety device of a power plant boiler inspection elevator. The method comprises the following steps: setting overload and short circuit protection on the main power switch; setting a hydraulic buffer compression protection switch after the electrical safety switch; setting motor overheat protection on the motor winding; setting a limit overtravel protection switch on the car sill; setting a safety clamp action protection switch on the upper beam of the car frame, and setting a limit protection switch for the previous action of the buffer; setting an emergency electric operation device on the traction machine; and setting a maintenance control device on the car top, inside the car, and in the machine room. The gain effect of the present invention is: the technical solution of the present invention is to modify the safety device of the inspection elevator, set various safety structures, and adopt multiple interconnected linkage methods to ensure the accuracy of the action of the safety device, effectively eliminate the potential safety hazards of the inspection elevator, and improve the operating reliability and safety of the inspection elevator.

Description

Technical Field

[0001] The present invention relates to the field of patrol elevator safety technology, and more specifically, to a modification and testing method of a patrol elevator safety device for a boiler in a power plant. Background Art

[0002] The inspection elevator of the factory's boiler is a special passenger elevator for inspection. It has limited carrying capacity and is mainly responsible for daily inspections, troubleshooting and maintenance after production. During this period, the elevator is often used to carry most of the maintenance tools and equipment, and the frequency of use is extremely high. The elevator has been operating at overload for a long time, and some parts have entered the aging period, with a significant increase in the failure rate. The structure of the traditional inspection elevator cannot meet the requirements of high-voltage operation, and the safety device is insufficiently configured. Some important components such as cars, wire ropes, traction machines and accompanying cables are prone to aging and wear, posing a major safety hazard. There is an urgent need for a method of improving the reliability and safety of the inspection elevator and facilitating replacement and debugging of the installation device to solve the technical defects of the existing boiler unit inspection elevator safety device.

[0003] The existing boiler unit inspection elevator safety device has the following technical defects: the environment of the elevator shaft steel components is humid, and the anti-corrosion effect cannot work for a long time. The overall waterproof sealing of the shaft is poor, the guide rail spacing is easy to change, the lighting system is aging, the elevator traction wheel is easy to wear, the turbine rod protection structure is insufficient, there is a certain difference in the installation tightening torque, the traction rope tension error value is high, the overall protection effect of the elevator car is poor, the frame is seriously corroded, and the elevator machine room is poorly waterproof and moisture-proof, resulting in frequent malfunctions of the elevator machine room electrical equipment, unable to guarantee normal operation, and posing a major safety hazard. The elevator accompanying cable is prone to broken strands and aging, resulting in poor balance in the car operation, and unable to guarantee safe operation of the car. Summary of the invention

[0004] The purpose of the present invention is to solve the technical defects of the safety device of the existing boiler unit inspection elevator and to propose a method for modifying the safety device of the power plant boiler inspection elevator with high safety and reliability.

[0005] The invention also provides a testing method for a power plant boiler inspection elevator safety device with high testing efficiency and accurate debugging.

[0006] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0007] A method for modifying a safety device of a power plant boiler inspection elevator comprises the following steps: S1: setting overload and short circuit protection on a main power switch; S2: setting a hydraulic buffer compression protection switch behind an electrical safety switch;

[0008] S3: Motor overheat protection is installed on the motor winding; S4: A limit overtravel protection switch is installed on the car sill; A safety clamp action protection switch is installed on the upper beam of the car frame, a limit protection switch is installed before the buffer action, a safety window protection switch is installed on the car, a speed limiter action protection switch is installed on the car, a full load and overload protection switch is installed on the car, and a rescue device is installed in the car, and a safety touch plate protection device is installed on the car door; S5: Emergency stop switches are installed in the machine room, car top and pit; S6: An emergency electric operation device is installed on the traction machine; S7: A speed limiter steel rope tensioning protection switch, a compensation rope device protection switch and a brake travel switch are installed on the cable; S8: A tachometer belt break protection switch is installed on the tachometer generator, and a protective cover is installed on the transmission belt; S9: Maintenance control devices are installed on the car top, in the car and in the machine room.

[0009] Preferably, the hydraulic buffer compression protection switch in S2 is used to verify the connection status of the electrical safety switch in the normal extension position to ensure the normal operation of the elevator. The energy-consuming buffer in the safety device must be restored to the normal position in time after the compression action. When the reset spring breaks or the plunger is stuck, it is very dangerous that the buffer will lose its function when the car or counterweight hits the top or bottom again. The present invention verifies the normal extension position of the electrical safety switch by setting a hydraulic buffer compression protection switch, and controls the electrical safety switch to be turned on after verification, so that the elevator can operate.

[0010] Preferably, the motor overheat protection provided in S3 is embedded in the motor winding, monitors the operating temperature of the motor winding, obtains the operating temperature value and compares it with the specified value, and then issues a cut-off or connect command to the control circuit. When the operating temperature of the motor winding rises to a value greater than the specified value, the motor overheat protection cuts off the control circuit of the elevator, causing the elevator to stop running; when the operating temperature of the motor winding drops below the specified value, the motor overheat protection automatically connects the control circuit, and the elevator resumes running.

[0011] Preferably, in S4, the limit overtravel protection switch is set between 50mm and the limit switch of the upper and lower terminal sill planes, and the elevator is controlled to stop after being triggered; a safety clamp action protection switch is set on the upper beam of the car frame in the form of manual reset, and the safety clamp action protection switch is linked with the traction machine to control the emergency action of the traction machine. The action of the safety clamp linkage device drives the safety clamp action protection switch to act, forcing the traction machine to stop running; the limit protection switch is set before the action of the buffer to keep the contact disconnected during the compression of the buffer, and the limit protection switch and the limit switch do not act at the same time; a safety window protection switch is set on the car and is set at a distance of less than or equal to 50mm from the edge of the car. The safety window protection switch is triggered to control the elevator to stop during maintenance or express operation. The opening direction of the safety window set on the car is upward. When the opening position exceeds the edge of the car by more than 50mm, the safety window protection switch is triggered, and the safety window protection switch stops the elevator to be maintained or run by express immediately; a speed limiter action protection switch is set on the car to detect the running speed of the car, and cut off the power supply of the motor and the brake when it is judged to exceed the rated speed. The speed limiter action protection switch is non-automatic Reset switch. When the car reaches the preset rated speed, the speed limiter protection switch quickly cuts off the power supply of the motor and brake to stop the traction machine. The elevator cannot start before the speed limiter protection switch is reset. A full-load and overload protection switch is set in the car to detect the real-time load of the car and control the operation mode of the car. When the car is loaded with a preset rated load, the full-load switch should be activated. The full-load and overload protection switch controls the elevator to cancel the forward loading function. When the load in the car is greater than the preset rated load, the full-load and overload protection switch is activated. The full-load and overload protection switch controls the operating panel. The overload light is on and the bell rings, and the elevator door cannot be closed, and the elevator cannot start running; an in-car rescue device is set up, the in-car rescue device includes an alarm system and an intercom system, the in-car rescue device is connected to the management system, and the in-car rescue device is connected to an automatically rechargeable emergency power supply. Once the normal power supply fails, the in-car rescue device automatically connects to the automatically rechargeable emergency power supply to supply power to the in-car rescue device; a safety touch panel protection device is set up on the car door, the safety touch panel protection device detects the operating force of the car door, and the safety touch panel protection device controls the closing limit thrust of the car door. During the closing of the car door, when the safety touch panel protection device detects that a foreign object is hit by the door, it controls the car door to automatically reopen. The force required for the safety touch panel protection device to prevent the door from closing is 140-160N.

[0012] Preferably, the emergency stop switch in S5 is installed in the machine room, on the car top and in the pit. The emergency stop switch triggers the elevator to stop immediately. The position of the emergency stop switch on the car top or in the pit is less than 1m from the entry position of the maintenance personnel. The emergency stop switch is a bistable switch and needs to be reset manually. Unintentional action should not cause the elevator to resume service.

[0013] Preferably, in S6, the emergency electric operation device includes an emergency electric operation switch and an operation button, and the emergency electric operation device is arranged on one side of the traction machine. The emergency electric operation switch and the operation button should be arranged at a position where the traction machine can be easily and directly observed. The emergency electric operation device is linked to the electrical safety devices of the speed limiter, safety clamp, buffer, and terminal limit switch. The emergency electric operation device limits the speed of the car, and the car speed should not exceed 0.63m / s. The emergency electric operation device is not linked to the electrical safety protection of the floor door lock. The emergency electric operation device is used for the commissioning, maintenance and troubleshooting of the elevator. The emergency electric operation device does not invalidate the electrical safety protection of the floor door lock.

[0014] Preferably, the speed limiter rope tension protection switch in S7 detects the falling distance of the counterweight wheel and the state of the rope, and controls the operation of the elevator. When the speed limiter rope tension protection switch detects that the counterweight wheel falls more than 50mm or the rope is disconnected, the speed limiter rope tension protection switch is immediately disconnected to stop the elevator; the compensation rope device protection switch detects the elevator running speed, and the electrical safety switch checks the tension of the compensation rope. When the rated speed of the elevator exceeds 2.5m / s, the compensation rope device protection switch activates the compensation rope with the tensioning wheel, and the tension of the compensation rope is maintained by gravity. The electrical safety switch checks the tension and is responsible for auxiliary feedback regulation. The tail end of the compensation rope device protection switch is reliably connected; the brake travel switch is linked to the magnet action travel, and the brake opening and closing action is controlled by the magnet action travel. When the magnet action travel is equal to 1.5mm, the brake travel switch is closed, and when the magnet action travel is reset, the brake travel switch maintains the disconnection gap.

[0015] Preferably, in S8, the tachometer belt break protection switch is installed on the tachometer generator, the tachometer belt break protection switch detects the operation of the transmission belt and controls the emergency operation of the elevator, and a protective cover is provided on the transmission belt.

[0016] Preferably, in S9, the maintenance control device is arranged on the top of the car, inside the car and in the machine room. The priority of the maintenance control device arranged on the top of the car is higher than that of the maintenance control devices arranged inside the car and in the machine room. After the maintenance control device on the top of the car is connected, the maintenance control devices inside the car and in the machine room fail to operate. During maintenance, all floor doors are closed for car movement. The maintenance control device links the normal operation and the operation of the automatic door. During maintenance operation, the normal operation and the operation of the automatic door are canceled. The maintenance control device controls the maintenance speed of the car. The maintenance speed does not exceed 0.63m / s and does not exceed the normal travel range of the car. The maintenance control device includes a maintenance switch and a continuous press button. The maintenance operation of the car is controlled by continuously pressing the button to prevent accidental operation. Continuously pressing the button indicates the control operation direction. The maintenance switch in the car is provided with a device to prevent misoperation. The maintenance switch is bistable and is provided with protection against unintentional operation.

[0017] A test method for a power plant boiler inspection elevator safety device includes a brake protection system test: the car is driven downward at a rated speed with a preset rated load, the power supply to the motor and the brake is cut off, the operation of the car is detected, and the deceleration of the car is compared with the deceleration caused by the action of the safety clamp or the collision of the car with the buffer;

[0018] Traction capacity balance protection test: Check the balance system of the elevator, test the unloaded car's upward travel within the upper range of the preset rated load and the car's downward travel within the lower range of the travel when the car is loaded.

[0019] When the counterweight is supported on the buffer compressed by it, the action of the traction rope on the empty car is detected.

[0020] When the car stops at the bottom floor level position, add the preset rated load steadily for static load, and check the condition of each load-bearing component and the braking condition of the traction mechanism;

[0021] Safety clamp test: Instantaneous safety clamp test, when the car has a uniformly distributed preset rated load and descends at the inspection speed, the speed limiter is controlled to operate, and the safety clamp should be tested on the car guide rail and the movement of the traction rope in the rope groove;

[0022] Progressive safety clamp test, with a preset rated load evenly distributed in the car, descending at the leveling speed or inspection speed to check the installation and adjustment, car assembly, and the firmness of the connection between the guide rail and the building;

[0023] Detect the speed of the speed limiter of the safety clamp of the counterweight installed in the aisle or space below the elevator pit where people pass by, compared with the speed limiter of the car safety clamp;

[0024] Buffer test: For spring energy storage buffer, the car is tested at rated load and inspection speed; the counterweight collides with the buffer when the car is empty and at inspection speed to test the tension of the traction rope;

[0025] For the inspection of hydraulic energy-absorbing buffers, the car or counterweight with rated load shall be in contact with the buffer at the inspection speed and compressed for a predetermined time, and then the reset time from the car or counterweight starting to leave the buffer until the buffer returns to its original state shall be inspected;

[0026] Static test adjustment test: the electrical circuit is not connected to the motor, the traction machine is not equipped with a car, and the test run is carried out without load;

[0027] Elevator system inspection: Check the manual turning or maintenance slow running, check the clearance between the door opening knife and the door sills of each floor, check the clearance between the door lock wheels of each floor and the car sill, check the relevant clearances of the leveling device, check the position relationship between the limit switch, forced deceleration switch and the iron contact, check the clearance between the outermost end of the car and the parallel wall, check the clearance between the car components and the guide rail bracket, wire trough, and intermediate junction box, check the distance between the accompanying cable, compensation chain, counterweight and various parts of the shaft;

[0028] Traction machine test run inspection: remove the traction rope from the traction wheel, restore the electrical circuit motor and brake circuit, test and adjust the traction machine brake, turn the motor by hand to rotate the traction machine, run it at a slow speed, and check the operation and temperature of the traction machine;

[0029] Fast train test run: seal the door opening mechanism, run the fast train, test and adjust the elevator's signal system, control system, and drive system, adjust the elevator's start, acceleration, speed change, braking, leveling, and forced deceleration switches, limit switches, limit switches, and safety switch positions, set the elevator's acceleration and deceleration time, and adjust the position of the leveling sensor;

[0030] Automatic door adjustment test: adjust the door lever, adjust the position of the door speed travel switch, adjust the door machine control system to make the door open and close speed, and test the safety touch panel and photoelectric protection device to ensure reliable function;

[0031] Elevator function test and inspection: The elevator function test is carried out item by item according to the type of elevator and the characteristics of the control method.

[0032] Compared with the prior art, the gain effect of the present invention is: the technical solution of the present invention is to ensure the accuracy of the action of the safety device by modifying the safety device of the inspection elevator, setting various safety structures, and adopting multiple interconnected linkage methods, effectively eliminating the potential safety hazards of the inspection elevator, improving the performance and safety reliability of the elevator, and better guaranteeing the overall quality. The technical solution of the present invention reduces the maintenance cost of the inspection elevator equipment, the modification cost is low, the safety factor of the inspection elevator after modification is high, the failure rate is greatly reduced, the accident response rate is fast, and the emergency treatment is convenient, ensuring the reliability and safety of the inspection elevator. DETAILED DESCRIPTION

[0033] In order to enable the examiners to have a further understanding of the purpose, features and functions of the present invention, the present invention is further described below in conjunction with specific embodiments:

[0034] The present invention discloses a method for modifying the safety device of a boiler inspection elevator in a power plant, comprising the following steps: S1: setting overload and short circuit protection on the main power switch; S2: setting a hydraulic buffer compression protection switch after the electrical safety switch; S3: setting motor overheat protection on the motor winding; S4: setting a limit overtravel protection switch on the car sill; setting a safety clamp action protection switch on the upper beam of the car frame, setting a limit protection switch before the buffer action, setting a safety window protection switch on the car, and setting a speed limiter action protection switch on the car. A full-load and overload protection switch is installed in the car, and a rescue device is installed in the car, and a safety touch panel protection device is installed on the car door; S5: Emergency stop switches are installed in the machine room, car roof and pit; S6: Emergency electric operation device is installed on the traction machine; S7: A speed limiter steel rope tensioning protection switch, a compensation rope device protection switch and a brake travel switch are installed on the cable; S8: A tachometer belt break protection switch is installed on the tachometer generator, and a protective cover is installed on the transmission belt; S9: Maintenance control devices are installed on the car roof, in the car and in the machine room.

[0035] Preferably, the hydraulic buffer compression protection switch in S2 is used to verify the connection status of the electrical safety switch in the normal extension position to ensure the normal operation of the elevator. The energy-consuming buffer in the safety device must be restored to the normal position in time after the compression action. When the reset spring breaks or the plunger is stuck, it is very dangerous that the buffer will lose its function when the car or counterweight hits the top or bottom again. The present invention verifies the normal extension position of the electrical safety switch by setting a hydraulic buffer compression protection switch, and controls the electrical safety switch to be turned on after verification, so that the elevator can operate.

[0036] Preferably, the motor overheat protection provided in S3 is embedded in the motor winding, monitors the operating temperature of the motor winding, obtains the operating temperature value and compares it with the specified value, and then issues a cut-off or connect command to the control circuit. When the operating temperature of the motor winding rises to a value greater than the specified value, the motor overheat protection cuts off the control circuit of the elevator, causing the elevator to stop running; when the operating temperature of the motor winding drops below the specified value, the motor overheat protection automatically connects the control circuit, and the elevator resumes running.

[0037] Preferably, the limit overtravel protection switch described in S4 is set between 50mm and the limit switch of the upper and lower terminal sill planes, and the elevator is controlled to stop operating after being triggered; a safety clamp action protection switch is set on the upper beam of the car frame in the form of manual reset, and the safety clamp action protection switch is linked with the traction machine to control the emergency action of the traction machine, and the action of the safety clamp linkage device drives the safety clamp action protection switch to act, forcing the traction machine to stop running; the limit protection switch is set before the action of the buffer to keep the contact disconnected during the compression of the buffer, and the limit protection switch and the limit switch do not act at the same time; a safety window protection switch is set on the car and is set at a distance of less than or equal to 50mm from the edge of the car. The safety window protection switch is triggered to control the elevator to stop operating during maintenance or express operation. The safety window set on the car opens upward. When the opening position exceeds the edge of the car by more than 50mm, the safety window protection switch is triggered, and the safety window protection switch stops the elevator to be maintained or operated by express immediately;

[0038] A speed limiter action protection switch is set in the car to detect the running speed of the car, and cut off the power supply of the motor and the brake when it is judged that the rated speed is exceeded. The speed limiter action protection switch is a non-automatic reset switch. When the car reaches a preset rated speed, wherein the preset rated speed ranges from 110% to 120% of the rated speed, and is preferably set to 115% of the rated speed, the speed limiter action protection switch quickly cuts off the power supply of the motor and the brake to stop the traction machine. Before the speed limiter action protection switch is reset, the elevator cannot be started; a full load and overload protection switch is set in the car to detect the real-time load of the car and control the operation mode of the car. When the car carries a preset rated load, wherein the adjustment range of the preset rated load is set to 88% to 93% of the rated load, and is preferably set to 90% of the rated load. When the load in the car is greater than the preset rated load, the full load switch should be activated, and the full load overload protection switch controls the elevator to cancel the forward loading function. When the load in the car is greater than the preset rated load, the full load overload protection switch is activated, and the full load overload protection switch controls the overload light on the control panel to light up and ring, and the elevator door cannot be closed, and the elevator cannot start running; a car rescue device is set, the car rescue device includes an alarm system and an intercom system, the car rescue device is connected to the management system, the car rescue device is connected to an automatic charging emergency power supply, and the car rescue device automatically connects to the automatic charging emergency power supply to supply power to the car rescue device once the normal power supply fails; a safety touch panel protection device is set on the car door, the safety touch panel protection device detects the operating force of the car door, and the safety touch panel protection device controls the closing limit thrust of the car door. During the closing of the car door, when the safety touch panel protection device detects that a foreign object is hit by the door, it controls the car door to automatically reopen. The force required by the safety touch panel protection device to prevent the door from closing is 140-160N, preferably 150N.

[0039] Preferably, the emergency stop switch in S5 is installed in the machine room, on the car top and in the pit. The emergency stop switch triggers the elevator to stop immediately. The position of the emergency stop switch on the car top or in the pit is less than 1m from the entry position of the maintenance personnel. The emergency stop switch is a bistable switch and needs to be reset manually. Unintentional action should not cause the elevator to resume service.

[0040] Preferably, in S6, the emergency electric operation device includes an emergency electric operation switch and an operation button, and the emergency electric operation device is arranged on one side of the traction machine. The emergency electric operation switch and the operation button should be arranged at a position where the traction machine can be easily and directly observed. The emergency electric operation device is linked to the electrical safety devices of the speed limiter, safety clamp, buffer, and terminal limit switch. The emergency electric operation device limits the speed of the car, and the car speed should not exceed 0.63m / s. The emergency electric operation device is not linked to the electrical safety protection of the floor door lock. The emergency electric operation device is used for the commissioning, maintenance and troubleshooting of the elevator. The emergency electric operation device does not invalidate the electrical safety protection of the floor door lock.

[0041] Preferably, the speed limiter rope tension protection switch in S7 detects the falling distance of the counterweight wheel and the state of the rope, and controls the operation of the elevator. When the speed limiter rope tension protection switch detects that the counterweight wheel falls more than 50mm or the rope is disconnected, the speed limiter rope tension protection switch is immediately disconnected to stop the elevator; the compensation rope device protection switch detects the elevator running speed, and the electrical safety switch checks the tension of the compensation rope. When the rated speed of the elevator exceeds 2.5m / s, the compensation rope device protection switch activates the compensation rope with the tensioning wheel, and the tension of the compensation rope is maintained by gravity. The electrical safety switch checks the tension and is responsible for auxiliary feedback regulation. The tail end of the compensation rope device protection switch is reliably connected; the brake travel switch is linked to the magnet action travel, and the brake opening and closing action is controlled by the magnet action travel. When the magnet action travel is equal to 1.5mm, the brake travel switch is closed, and when the magnet action travel is reset, the brake travel switch maintains the disconnection gap.

[0042] Preferably, in S8, the tachometer belt break protection switch is installed on the tachometer generator, the tachometer belt break protection switch detects the operation of the transmission belt and controls the emergency operation of the elevator, and a protective cover is provided on the transmission belt.

[0043] Preferably, in S9, the maintenance control device is arranged on the top of the car, inside the car and in the machine room. The priority of the maintenance control device arranged on the top of the car is higher than that of the maintenance control devices arranged inside the car and in the machine room. After the maintenance control device on the top of the car is connected, the maintenance control devices inside the car and in the machine room fail to operate. During maintenance, all floor doors are closed for car movement. The maintenance control device links the normal operation and the operation of the automatic door. During maintenance operation, the normal operation and the operation of the automatic door are canceled. The maintenance control device controls the maintenance speed of the car. The maintenance speed does not exceed 0.63m / s and does not exceed the normal travel range of the car. The maintenance control device includes a maintenance switch and a continuous press button. The maintenance operation of the car is controlled by continuously pressing the button to prevent accidental operation. Continuously pressing the button indicates the control operation direction. The maintenance switch in the car is provided with a device to prevent misoperation. The maintenance switch is bistable and is provided with protection against unintentional operation.

[0044] A test method for a power plant boiler inspection elevator safety device includes a brake protection system test: the car is set to a preset rated load, the setting range of the preset rated load is set to 120-130% of the rated load, preferably 125% of the rated load, and the rated speed is descended, the power supply of the motor and the brake is cut off, the operation of the car is detected, and the deceleration of the car is compared with the deceleration caused by the action of the safety clamp or the collision of the car on the buffer;

[0045] Traction capacity balance protection test: detect the balance system number of the elevator, the range of the balance system number is set at 40% to 50%, test the car braking situation when the empty car moves upward within the upper range of the travel under the preset rated load and when the car is loaded and the car is downward within the lower range of the travel, the setting range of the preset rated load is set to 120-130% of the rated load, preferably 125% of the rated load, when the counterweight is supported on the buffer compressed by it, detect the action of the traction rope on the empty car, when the car stops at the bottom leveling position, steadily add the preset rated load for static load, and detect the conditions of each load-bearing component and the braking condition of the traction mechanism;

[0046] Safety clamp test: Instantaneous safety clamp test, when the car has a uniformly distributed preset rated load and descends at the inspection speed, the speed limiter is controlled to operate, and the safety clamp should be tested on the car guide rail and the movement of the traction rope in the rope groove;

[0047] Progressive safety clamp test, with a uniformly distributed preset rated load in the car, the setting range of the preset rated load is set to 120-130% of the rated load, preferably 125% of the rated load, and the car is driven downward at the leveling speed or maintenance speed to detect the installation and adjustment, car assembly, and the firmness of the connection between the guide rail and the building;

[0048] Detect the speed of the speed limiter of the safety clamp of the counterweight installed in the aisle or space below the elevator pit where people pass by, compared with the speed limiter of the car safety clamp;

[0049] Buffer test: For spring energy storage buffer, the car is tested at rated load and inspection speed; the counterweight collides with the buffer when the car is empty and at inspection speed to test the tension of the traction rope;

[0050] For the inspection of hydraulic energy-absorbing buffers, the car or counterweight with rated load shall be in contact with the buffer at the inspection speed and compressed for a predetermined time, and then the reset time from the car or counterweight starting to leave the buffer until the buffer returns to its original state shall be detected. The reset time range is 80-120s.

[0051] Static test adjustment inspection: The electrical circuit is not connected to the motor, and the traction machine is not equipped with a car and is tested without load;

[0052] Elevator system inspection: Check the manual turning or maintenance slow running, check the clearance between the door opening knife and the door sills of each floor, check the clearance between the door lock wheels of each floor and the car sill, check the relevant clearances of the leveling device, check the position relationship between the limit switch, forced deceleration switch and the iron contact, check the clearance between the outermost end of the car and the parallel wall, check the clearance between the car components and the guide rail bracket, wire trough, and intermediate junction box, check the distance between the accompanying cable, compensation chain, counterweight and various parts of the shaft;

[0053] Traction machine test run inspection: remove the traction rope from the traction wheel, restore the electrical circuit motor and brake circuit, test and adjust the traction machine brake, turn the motor by hand to rotate the traction machine, run it at a slow speed, and check the operation and temperature of the traction machine;

[0054] Fast train test run: seal the door opening mechanism, run the fast train, test and adjust the elevator's signal system, control system, and drive system, adjust the elevator's start, acceleration, speed change, braking, leveling, and forced deceleration switches, limit switches, limit switches, and safety switch positions, set the elevator's acceleration and deceleration time, and adjust the position of the leveling sensor;

[0055] Automatic door adjustment test: adjust the door lever, adjust the position of the door speed travel switch, adjust the door machine control system to make the door open and close speed, and test the safety touch panel and photoelectric protection device to ensure reliable function;

[0056] Elevator function test and inspection: The elevator function test is carried out item by item according to the type of elevator and the characteristics of the control method.

[0057] Embodiment 1:

[0058] A method for modifying a safety device of a power plant boiler inspection elevator comprises the following steps: S1: setting overload and short-circuit protection on a main power switch;

[0059] S2: A hydraulic buffer compression protection switch is set after the electrical safety switch. The hydraulic buffer compression protection switch in S2 is used to verify the connection status of the electrical safety switch in the normal extension position to ensure the normal operation of the elevator. The energy-consuming buffer in the safety device must be restored to the normal position in time after the compression action. When the reset spring breaks or the plunger is stuck, it is very dangerous that the buffer will lose its function when the car or counterweight hits the top or bottom again. The present invention verifies the normal extension position of the electrical safety switch by setting a hydraulic buffer compression protection switch. After verification, the electrical safety switch is controlled to be turned on, and the elevator can run;

[0060] S3: Set up motor overheat protection in the motor winding. The motor overheat protection set in S3 is buried in the motor winding, monitors the operating temperature of the motor winding, obtains the operating temperature value and compares it with the specified value, and then issues a cut-off or connect command to the control circuit. When the operating temperature of the motor winding rises to a value greater than the specified value, the motor overheat protection cuts off the control circuit of the elevator and stops the elevator; when the operating temperature of the motor winding drops below the specified value, the motor overheat protection automatically connects the control circuit and the elevator resumes operation;

[0061] S4: A limit overtravel protection switch is set on the car sill; a safety clamp action protection switch is set on the upper beam of the car frame, a limit protection switch is set before the action of the buffer, a safety window protection switch is set on the car, a speed limiter action protection switch is set on the car, a full load and overload protection switch is set on the car, and a rescue device is set in the car, and a safety touch plate protection device is set on the car door. The limit overtravel protection switch described in S4 is set between 50mm and the limit switch of the upper and lower terminal sill planes, and the elevator is controlled to stop after being triggered; a safety clamp action protection switch is set on the upper beam of the car frame in the form of manual reset, and the safety clamp action protection switch is linked with the traction machine to control the traction machine In emergency action, the action of the safety clamp linkage device drives the action of the safety clamp action protection switch, forcing the traction machine to stop running; the limit protection switch is set before the action of the buffer to keep the contact disconnected during the compression of the buffer, and the limit protection switch and the limit switch do not act at the same time; the safety window protection switch is set on the car and is set to be less than or equal to 50mm from the edge of the car. The safety window protection switch is triggered to control the maintenance or express running elevator to stop. The safety window set on the car opens upward. When the opening position exceeds the edge of the car by more than 50mm, the safety window protection switch is triggered, and the safety window protection switch stops the maintenance or express running elevator immediately; A speed limiter action protection switch is set in the car to detect the running speed of the car. If it is judged that the rated speed is exceeded, the power supply of the motor and the brake will be cut off. The speed limiter action protection switch is a non-automatic reset switch. When the car reaches 115% of the rated speed, the speed limiter action protection switch quickly cuts off the power supply of the motor and the brake to stop the traction machine. Before the speed limiter action protection switch is reset, the elevator cannot be started; a full-load overload protection switch is set in the car to detect the real-time load of the car and control the operation mode of the car. When the car is loaded with 90% of the rated load, the full-load switch should be activated. The full-load overload protection switch controls the elevator to cancel the forward car loading function. When the load in the car is greater than the preset When the rated load is set, the full-load overload protection switch is activated, the overload light on the full-load overload protection switch control panel lights up and rings, and the elevator door cannot be closed, and the elevator cannot start running; an in-car rescue device is provided, the in-car rescue device includes an alarm system and an intercom system, the in-car rescue device is connected to the management system, the in-car rescue device is connected to an automatic charging emergency power supply, and once the normal power supply fails, the in-car rescue device automatically connects to the automatic charging emergency power supply to supply power to the in-car rescue device; a safety touch panel protection device is provided on the car door, the safety touch panel protection device detects the operating force of the car door, and the safety touch panel protection device controls the closing limit thrust of the car door. During the closing period of the car door, when the safety touch panel protection device detects that a foreign object is hit by the door, it controls the car door to automatically reopen. The force required by the safety touch panel protection device to prevent the door from closing is less than 150N;

[0062] S5: Emergency stop switches are installed in the machine room, car top and pit. In S5, the emergency stop switches are installed in the machine room, car top and pit. The emergency stop switches are triggered to control the elevator to stop immediately. The position of the emergency stop switch on the car top or in the pit is less than 1m from the entry position of the maintenance personnel. The emergency stop switch is a bistable switch and needs to be reset manually. Unintentional action should not restore the elevator to service;

[0063] S6: An emergency electric operation device is provided on the traction machine. The emergency electric operation device in S6 includes an emergency electric operation switch and an operation button. The emergency electric operation device is provided on one side of the traction machine. The emergency electric operation switch and the operation button should be provided at a position where the traction machine can be directly observed. The emergency electric operation device is linked to the electrical safety devices of the speed limiter, safety clamp, buffer, and terminal limit switch. The emergency electric operation device limits the speed of the car, and the car speed should not exceed 0.63m / s. The emergency electric operation device is not linked to the electrical safety protection of the floor door lock. The emergency electric operation device is used for elevator commissioning, maintenance, and troubleshooting. The emergency electric operation device does not invalidate the electrical safety protection of the floor door lock.

[0064] S7: A speed limiter steel rope tensioning protection switch, a compensating rope device protection switch and a brake travel switch are set on the cable. The speed limiter steel rope tensioning protection switch in S7 detects the falling distance of the counterweight wheel and the state of the steel rope, and controls the operation of the elevator. When the speed limiter steel rope tensioning protection switch detects that the falling distance of the counterweight wheel is greater than 50mm or the steel rope is disconnected, the speed limiter steel rope tensioning protection switch is immediately disconnected to stop the elevator; the compensating rope device protection switch detects the elevator running speed, and the electrical safety switch is used to check the tension of the compensating rope. When the rated speed of the elevator exceeds 2.5m / s, the compensating rope device protection switch activates the compensating rope with a tensioning wheel, and the tension of the compensating rope is maintained by gravity. The electrical safety switch is used to check the tension and is responsible for auxiliary feedback regulation. The tail end of the protection switch of the compensation rope device is reliably connected; the brake travel switch is linked with the magnet action travel, and the brake opening and closing action is controlled by the magnet action travel. When the magnet action travel is equal to 1.5mm, the brake travel switch is closed, and when the magnet action travel is reset, the brake travel switch maintains the disconnection gap;

[0065] S8: a tachometer belt break protection switch is provided on the tachometer generator, and a protective cover is provided on the transmission belt. In S8, the tachometer belt break protection switch is installed on the tachometer generator, the tachometer belt break protection switch detects the running condition of the transmission belt, controls the emergency running action of the elevator, and a protective cover is provided on the transmission belt;

[0066] S9: Maintenance control devices are arranged on the car top, inside the car and in the machine room. In S9, the maintenance control devices are arranged on the car top, inside the car and in the machine room. The maintenance control device arranged on the car top has a higher priority than the maintenance control devices arranged inside the car and in the machine room. After the maintenance control device on the car top is connected, the maintenance control devices inside the car and in the machine room become invalid and cannot operate. During maintenance, all floor doors are closed for car movement. The maintenance control device links the normal operation and the operation of the automatic door. During maintenance operation, the normal operation and the operation of the automatic door are canceled. The maintenance control device controls the maintenance speed of the car. The maintenance speed does not exceed 0.63m / s and does not exceed the normal travel range of the car. The maintenance control device includes a maintenance switch and a continuous press button. The maintenance operation of the car is controlled by continuously pressing the button to prevent accidental operation. Continuously pressing the button indicates the control operation direction. The maintenance switch in the car is provided with a device to prevent misoperation. The maintenance switch is bistable and has protection against unintentional operation.

[0067] The present embodiment provides a testing method for a power plant boiler inspection elevator safety device, including a brake protection system test: the car is set to a preset rated load, the setting range of the preset rated load is set to 120-130% of the rated load, preferably 125% of the rated load, and descends at a rated speed, the power supply of the motor and the brake is cut off, the operation of the car is detected, and the deceleration of the car is compared with the deceleration caused by the action of the safety clamp or the collision of the car on the buffer; when the car is 125% of the rated load and descends at the rated speed, the power supply of the motor and the brake is cut off, and the car should be able to stop running. At the same time, the deceleration of the car should not exceed the deceleration caused by the action of the safety clamp or the collision of the car on the buffer.

[0068] Traction capacity balance protection test: detect the balance system number of the elevator, the balance system number range is set at 45-50%, test the car braking situation when the empty car moves upward within the upper range of the travel under the preset rated load and when the car is loaded and the car is downward within the lower range of the travel, the setting range of the preset rated load is set to 120-130% of the rated load, preferably 125% of the rated load, when the counterweight is supported on the buffer compressed by it, detect the action of the traction rope on the empty car, when the car stops at the bottom level position, steadily add the preset rated load for static load, and detect the conditions of each load-bearing component and the braking condition of the traction mechanism; 1 ) The balance system number of the elevator should be 45-50%; 2) The empty car should be reliably stopped when it goes up within the upper range of the stroke, and the car is loaded with 125% of the rated load and goes down within the lower range of the stroke. The car should be reliably stopped when it makes emergency stops more than 3 times in both cases. The leveling requirement is not assessed when going down; 3) When the counterweight is supported on the buffer compressed by it, the empty car cannot be lifted by the traction rope; 4) When the car area cannot limit the load to exceed the rated value, the car should be stopped at the bottom leveling position, and a static load inspection of 150% of the rated load should be added steadily for 10 minutes. Check that all load-bearing components should be free of damage and the traction mechanism should be braked reliably without slipping.

[0069] Safety clamp test: Instantaneous safety clamp test, when the car has a uniformly distributed preset rated load and descends at the inspection speed, the speed limiter is controlled to operate, and the safety clamp should be tested on the car guide rail and the movement of the traction rope in the rope groove; Progressive safety clamp test, when the car has a uniformly distributed preset rated load and descends at the leveling speed or inspection speed, the installation adjustment and the firmness of the car assembly, guide rail and building connection are tested; the speed limiter action speed of the safety clamp corresponding to the counterweight set in the aisle or space where people pass under the elevator pit is compared with the speed limiter action speed of the car safety clamp; 1) Instantaneous safety clamp test, when the car has a uniformly distributed rated load and descends at the inspection speed, the speed limiter is controlled to operate. At this time, the safety clamp should stop the car on the guide rail and the traction rope should slip in the rope groove; 2) Progressive safety clamp test. The test is carried out under the condition that the car has an evenly distributed 125% rated load and is descending at the leveling speed or maintenance speed. The purpose of the test is to check whether the installation and adjustment are correct, as well as the firmness of the car assembly, guide rail and building connection; 3) When there is an aisle or space for people to pass under the elevator pit, a safety clamp should also be installed on the counterweight, and the speed limiter action speed should be higher than the speed limiter action speed of the car safety clamp, but not more than 10%.

[0070] Buffer test: For the spring energy storage buffer test, the car is at rated load and inspection speed; the counterweight is at no-load and inspection speed, respectively, and the tension of the traction rope is tested; for the hydraulic energy dissipation buffer test, the car or counterweight with rated load should contact the buffer at the inspection speed and be compressed for a predetermined time, and then the reset time from the car or counterweight starting to leave the buffer until the buffer returns to its original state is tested. The reset time interval is 120s; 1) For the spring energy storage buffer test, the car is at rated load and inspection speed; the counterweight is at no-load and inspection speed, respectively, and the traction rope is relaxed; 2) Energy dissipation (hydraulic) buffer test. The car or counterweight with rated load should contact the buffer at the inspection speed and be compressed for 5 minutes, and then the car or counterweight starts to leave the buffer until the buffer returns to its original state, and the required time should be less than 120s.

[0071] Static test adjustment inspection: The electrical circuit is not connected to the motor, the traction machine is not equipped with a car, and the test run is performed without load.

[0072] Elevator system inspection: Check the manual turning or maintenance slow car operation, check the gap between the door opening knife and the door sills of each floor, check the gap between the door lock wheels of each floor and the car sill, check the relevant gaps of the leveling device, check the position relationship between the limit switch, forced deceleration switch and the touch iron, check the gap between the outermost end of the car and the parallel wall, check the gap between the car components and the guide rail bracket, wire trough, intermediate junction box, check the distance between the accompanying cable, compensation chain, counterweight and various components of the shaft.

[0073] Traction machine test run inspection: remove the traction rope from the traction wheel, restore the electrical circuit motor and brake circuit, test and adjust the traction machine brake, turn the motor by hand to rotate the traction machine, run slowly, and check the operation and temperature of the traction machine; 1) Lift the car and remove the elevator traction rope from the traction wheel, restore the electrical circuit to check the motor and brake circuit removed during the test; 2) Brake test adjustment. Power the brake coil separately, the gap between the brake shoe and the brake wheel should be uniform, within 0.7mm, and there should be no friction; the coil joint should be reliable and not loose, the outside of the coil must be well insulated, and its current value should be adjusted reasonably. Too small current will result in insufficient attraction, too large current will result in too rapid attraction, and cause the coil temperature to rise too high. The coil temperature rise should not exceed 60℃. In order to prevent the two cores from colliding with each other when they are attracted, the gap between the bottom of the two cores after attraction should be adjusted to 0.5-1mm, but this gap should not affect the rapid attraction of the cores; there should be no brake release hysteresis. Under normal circumstances, the brake release time should not be greater than 0.08s; the brake spring should be adjusted appropriately. If the braking force is too small, it will affect the accuracy of the leveling, and even cause the car to slip when stopping, which is dangerous. Excessive braking force will affect the stability of the car leveling. When the elevator is tested for static load and overloaded, the clamping force of the brake spring should enable the elevator to brake reliably; the brake release device should be tested reliably; the adjustment screws and locking nuts must not be loose, the pins should rotate freely, and the brake wheel and brake shoe should be free of oil or paint; 3) Turn the motor by hand to make it rotate. If there is no obstruction and the sound is normal, start the motor to run slowly; check the operation of each component and the temperature rise of the motor bearing. If there is a problem, stop the car in time. If the operation is normal, try it for 5 minutes and then change it to fast operation, and continue to check the operation and temperature of each component.

[0074] The bearing temperature requirement is: oil cup lubrication should not exceed 75℃, and rolling bearing should not exceed 85℃. If it is a DC elevator, check the brushes of the DC motor to see if they are in good contact and in the correct position, and observe whether the direction of the motor is consistent with the running direction. If the situation is normal, the test run is completed after continuous forward and reverse operation for 2.5 hours each. During the test run, the no-load current of the motor should be measured and should meet the requirements.

[0075] Fast test run test: seal the door opening mechanism, run at fast speed, test and adjust the elevator's signal system, control system, and drive system, adjust the elevator's start, acceleration, speed change, braking, leveling, and forced deceleration switches, limit switches, limit switches, and safety switches, set the elevator acceleration and deceleration time, and adjust the position of the leveling sensor; 1) After the test run is normal in the maintenance state, the doors of each floor are closed and the door locks are reliable before the fast state operation can be carried out; 2) Seal the door opening mechanism, run at fast speed, and continue to check the moving parts, focusing on the leakage of lubricating oil in the worm shaft extension. Oil stains are allowed, but after wiping, it is required that no oil is seen within 5 minutes of operation and no drops are formed within 15 minutes. The oil temperature shall not exceed 80℃, and the bearing temperature requirements are the same as before. Check the stability and noise of the traction machine, whether there is any gnawing sound, impact sound, bearing grinding sound in the reducer, and the sealing condition of each sealing surface, the looseness and braking condition of the brake, etc. At the maximum speed of the motor, the test run ends after continuous forward and reverse operation for 2 hours each. During the test run, the current of the motor should be tested; 3) Drive the car slowly and stop it at the middle floor. No one is in the car. According to the operating requirements, manually simulate the start of the car in the control cabinet of the machine room. First single-layer, then multi-layer, up and down several times (not to the upper and lower terminals for the time being). If there is no problem, the tester enters the car and performs actual operation. During the test run, the signal system, control system, and drive system of the elevator are tested and adjusted to make them all normal. The positions of the elevator's start, acceleration, speed change, braking, leveling, forced deceleration switch, limit switch, limit switch, and safety switch are precisely adjusted, and the operation should be accurate, safe and reliable. The external call button and the command button are both functional. At the same time, the tester conducts further inspections and tests on the traction device, motor (and its current), and brake in the machine room; 4) Setting of acceleration and deceleration time: Adjust the control potentiometer so that there is no step during starting and braking, and the comfort is good. The purpose is to reduce the mechanical and current impact during speed switching, and to ensure the acceleration and deceleration requirements of the elevator; 5) Adjustment of the leveling sensor: During the initial adjustment, the distance between the upper and lower leveling sensors installed on the car top can be taken as the length of the magnetic isolation plate installed in the shaft plus about 100mm. During fine adjustment, the base station is used as the standard to adjust the position of the sensor, and the other stations adjust the position of each sensor plate in the shaft.

[0076] Automatic door adjustment test: adjust the door lever, adjust the position of the door speed travel switch, adjust the door machine control system to make the door open and close speed, and test the safety touch panel and photoelectric protection device to ensure reliable function;

[0077] Elevator function test and inspection: The elevator function test is carried out item by item according to the type of elevator and the characteristics of the control method.

[0078] Embodiment 2:

[0079] A method for modifying a safety device of a power plant boiler inspection elevator comprises the following steps:

[0080] S1: Set overload and short circuit protection on the main power switch;

[0081] S2: A hydraulic buffer compression protection switch is set after the electrical safety switch. The hydraulic buffer compression protection switch in S2 is used to verify the connection status of the electrical safety switch in the normal extension position to ensure the normal operation of the elevator. The energy-consuming buffer in the safety device must be restored to the normal position in time after the compression action. When the reset spring breaks or the plunger is stuck, it is very dangerous that the buffer will lose its function when the car or counterweight hits the top or bottom again. The present invention verifies the normal extension position of the electrical safety switch by setting a hydraulic buffer compression protection switch. After verification, the electrical safety switch is controlled to be turned on, and the elevator can run;

[0082] S3: Set up motor overheat protection in the motor winding. The motor overheat protection set in S3 is buried in the motor winding, monitors the operating temperature of the motor winding, obtains the operating temperature value and compares it with the specified value, and then issues a cut-off or connect command to the control circuit. When the operating temperature of the motor winding rises to a value greater than the specified value, the motor overheat protection cuts off the control circuit of the elevator and stops the elevator; when the operating temperature of the motor winding drops below the specified value, the motor overheat protection automatically connects the control circuit and the elevator resumes operation;

[0083] S4: A limit overtravel protection switch is set on the car sill; a safety clamp action protection switch is set on the upper beam of the car frame, a limit protection switch is set before the action of the buffer, a safety window protection switch is set on the car, a speed limiter action protection switch is set on the car, a full load and overload protection switch is set on the car, and a rescue device is set in the car, and a safety touch plate protection device is set on the car door. The limit overtravel protection switch described in S4 is set between 50mm and the limit switch of the upper and lower terminal sill planes, and the elevator is controlled to stop after being triggered; a safety clamp action protection switch is set on the upper beam of the car frame in the form of manual reset, and the safety clamp action protection switch is linked with the traction machine to control the traction machine In emergency action, the action of the safety clamp linkage device drives the action of the safety clamp action protection switch, forcing the traction machine to stop running; the limit protection switch is set before the action of the buffer to keep the contact disconnected during the compression of the buffer, and the limit protection switch and the limit switch do not act at the same time; the safety window protection switch is set on the car and is set to be less than or equal to 50mm from the edge of the car. The safety window protection switch is triggered to control the maintenance or express running elevator to stop. The safety window set on the car opens upward. When the opening position exceeds the edge of the car by more than 50mm, the safety window protection switch is triggered, and the safety window protection switch stops the maintenance or express running elevator immediately; A speed limiter action protection switch is set in the car to detect the running speed of the car. If it is judged that the rated speed is exceeded, the power supply of the motor and the brake will be cut off. The speed limiter action protection switch is a non-automatic reset switch. When the car reaches 110% of the rated speed, the speed limiter action protection switch quickly cuts off the power supply of the motor and the brake to stop the traction machine. Before the speed limiter action protection switch is reset, the elevator cannot be started; a full-load overload protection switch is set in the car to detect the real-time load of the car and control the operation mode of the car. When the car is loaded with 88% of the rated load, the full-load switch should be activated. The full-load overload protection switch controls the elevator to cancel the forward car loading function. When the load in the car is greater than the preset When the rated load is set, the full-load overload protection switch is activated, the overload light on the control panel of the full-load overload protection switch lights up and rings, and the elevator door cannot be closed, and the elevator cannot start running; an in-car rescue device is provided, the in-car rescue device includes an alarm system and an intercom system, the in-car rescue device is connected to the management system, the in-car rescue device is connected to an automatic charging emergency power supply, and once the normal power supply of the in-car rescue device fails, the automatic charging emergency power supply is automatically connected to supply power to the in-car rescue device to operate; a safety touch panel protection device is provided on the car door, the safety touch panel protection device detects the operating force of the car door, and the safety touch panel protection device controls the closing limit thrust of the car door. During the closing period of the car door, when the safety touch panel protection device detects that a foreign object is hit by the door, it controls the car door to automatically reopen. The force required by the safety touch panel protection device to prevent the door from closing is less than 140N;

[0084] S5: Emergency stop switches are installed in the machine room, car top and pit. In S5, the emergency stop switches are installed in the machine room, car top and pit. The emergency stop switches are triggered to control the elevator to stop immediately. The position of the emergency stop switch on the car top or in the pit is less than 1m from the entry position of the maintenance personnel. The emergency stop switch is a bistable switch and needs to be reset manually. Unintentional action should not restore the elevator to service;

[0085] S6: An emergency electric operation device is provided on the traction machine. The emergency electric operation device in S6 includes an emergency electric operation switch and an operation button. The emergency electric operation device is provided on one side of the traction machine. The emergency electric operation switch and the operation button should be provided at a position where the traction machine can be directly observed. The emergency electric operation device is linked to the electrical safety devices of the speed limiter, safety clamp, buffer, and terminal limit switch. The emergency electric operation device limits the speed of the car, and the car speed should not exceed 0.63m / s. The emergency electric operation device is not linked to the electrical safety protection of the floor door lock. The emergency electric operation device is used for elevator commissioning, maintenance, and troubleshooting. The emergency electric operation device does not invalidate the electrical safety protection of the floor door lock.

[0086] S7: A speed limiter steel rope tensioning protection switch, a compensating rope device protection switch and a brake travel switch are set on the cable. The speed limiter steel rope tensioning protection switch in S7 detects the falling distance of the counterweight wheel and the state of the steel rope, and controls the operation of the elevator. When the speed limiter steel rope tensioning protection switch detects that the falling distance of the counterweight wheel is greater than 50mm or the steel rope is disconnected, the speed limiter steel rope tensioning protection switch is immediately disconnected to stop the elevator; the compensating rope device protection switch detects the elevator running speed, and the electrical safety switch is used to check the tension of the compensating rope. When the rated speed of the elevator exceeds 2.5m / s, the compensating rope device protection switch activates the compensating rope with a tensioning wheel, and the tension of the compensating rope is maintained by gravity. The electrical safety switch is used to check the tension and is responsible for auxiliary feedback regulation. The tail end of the protection switch of the compensation rope device is reliably connected; the brake travel switch is linked with the magnet action travel, and the brake opening and closing action is controlled by the magnet action travel. When the magnet action travel is equal to 1.5mm, the brake travel switch is closed, and when the magnet action travel is reset, the brake travel switch maintains the disconnection gap;

[0087] S8: a tachometer belt break protection switch is provided on the tachometer generator, and a protective cover is provided on the transmission belt. In S8, the tachometer belt break protection switch is installed on the tachometer generator, the tachometer belt break protection switch detects the running condition of the transmission belt, controls the emergency running action of the elevator, and a protective cover is provided on the transmission belt;

[0088] S9: Maintenance control devices are arranged on the car top, inside the car and in the machine room. In S9, the maintenance control devices are arranged on the car top, inside the car and in the machine room. The maintenance control device arranged on the car top has a higher priority than the maintenance control devices arranged inside the car and in the machine room. After the maintenance control device on the car top is connected, the maintenance control devices inside the car and in the machine room become invalid and cannot operate. During maintenance, all floor doors are closed for car movement. The maintenance control device links the normal operation and the operation of the automatic door. During maintenance operation, the normal operation and the operation of the automatic door are canceled. The maintenance control device controls the maintenance speed of the car. The maintenance speed does not exceed 0.63m / s and does not exceed the normal travel range of the car. The maintenance control device includes a maintenance switch and a continuous press button. The maintenance operation of the car is controlled by continuously pressing the button to prevent accidental operation. Continuously pressing the button indicates the control operation direction. The maintenance switch in the car is provided with a device to prevent misoperation. The maintenance switch is bistable and has protection against unintentional operation.

[0089] The present embodiment is a testing method for the safety device of the power plant boiler inspection elevator, including the testing of the brake protection system: the car descends at a rated speed with a preset rated load, the power supply of the motor and the brake is cut off, the operation of the car is detected, and the deceleration of the car is compared with the deceleration caused by the action of the safety clamp or the collision of the car on the buffer; when the car descends at a rated speed with a rated load of 120%, the power supply of the motor and the brake is cut off, and the car should be able to stop running. At the same time, the deceleration of the car should not exceed the deceleration caused by the action of the safety clamp or the collision of the car on the buffer.

[0090] Traction capacity balance protection test: Check the balance system number of the elevator. The balance system number range is set at 40-45%. Test the car braking condition of the empty car in the upper range of the preset rated load and the car braking condition of the car in the lower range of the travel. When the counterweight is supported on the buffer compressed by it, check the action of the traction rope on the empty car. When the car stops at the bottom level position, add the preset rated load steadily for static load, check the condition of each load-bearing component and the braking condition of the traction mechanism; 1) The balance system number of the elevator should be within the range of 40-45%. ; 2) When the empty car is ascending within the upper range of the stroke and the car is loaded with 125% of the rated load and descending within the lower range of the stroke, the car should be reliably stopped if emergency stops are made more than 3 times in both cases. The car should be reliably stopped and the leveling requirement is not assessed when descending; 3) When the counterweight is supported on the buffer compressed by it, the empty car cannot be lifted by the traction rope; 4) When the car area cannot limit the load from exceeding the rated value, the car should be stopped at the bottom leveling position and a static load of 150% of the rated load should be added steadily for 10 minutes. Check that all load-bearing components are free of damage and the traction mechanism is braked reliably without slipping.

[0091] Safety clamp test: Instantaneous safety clamp test, when the car has a uniformly distributed preset rated load and descends at the inspection speed, the speed limiter is controlled to operate, and the safety clamp should be tested on the car guide rail and the movement of the traction rope in the rope groove; Progressive safety clamp test, when the car has a uniformly distributed preset rated load and descends at the leveling speed or inspection speed, the installation adjustment and the firmness of the car assembly, guide rail and building connection are tested; the speed limiter action speed of the safety clamp corresponding to the counterweight set in the aisle or space where people pass under the elevator pit is compared with the speed limiter action speed of the car safety clamp; 1) Instantaneous safety clamp test, when the car has a uniformly distributed rated load and descends at the inspection speed, the speed limiter is controlled to operate. At this time, the safety clamp should stop the car on the guide rail and the traction rope should slip in the rope groove; 2) Progressive safety clamp test. The test is carried out under the condition that the car has an evenly distributed 120% rated load and is descending at the leveling speed or maintenance speed. The purpose of the test is to check whether the installation and adjustment are correct, as well as the firmness of the car assembly and the connection between the guide rails and the building; 3) When there is an aisle or space for people to pass under the elevator pit, a safety clamp should also be installed on the counterweight, and the speed limiter action speed should be higher than the speed limiter action speed of the car safety clamp, but not more than 10%.

[0092] Buffer test: For the spring energy storage buffer test, the car is at rated load and inspection speed; the counterweight is at no-load and inspection speed, respectively, and the tension of the traction rope is tested; for the hydraulic energy dissipation buffer test, the car or counterweight with rated load should contact the buffer at the inspection speed and be compressed for a predetermined time, and then the reset time from the car or counterweight starting to leave the buffer until the buffer returns to its original state is tested. The reset time interval is 80s; 1) For the spring energy storage buffer test, the car is at rated load and inspection speed; the counterweight is at no-load and inspection speed, respectively, and the traction rope is relaxed; 2) Energy dissipation (hydraulic) buffer test. The car or counterweight with rated load should contact the buffer at the inspection speed and be compressed for 5 minutes, and then the car or counterweight starts to leave the buffer until the buffer returns to its original state, and the required time should be less than 80s.

[0093] Static test adjustment inspection: The electrical circuit is not connected to the motor, the traction machine is not equipped with a car, and the test run is performed without load.

[0094] Elevator system inspection: Check the manual turning or maintenance slow car operation, check the gap between the door opening knife and the door sills of each floor, check the gap between the door lock wheels of each floor and the car sill, check the relevant gaps of the leveling device, check the position relationship between the limit switch, forced deceleration switch and the touch iron, check the gap between the outermost end of the car and the parallel wall, check the gap between the car components and the guide rail bracket, wire trough, intermediate junction box, check the distance between the accompanying cable, compensation chain, counterweight and various components of the shaft.

[0095] Traction machine test run inspection: remove the traction rope from the traction wheel, restore the electrical circuit motor and brake circuit, test and adjust the traction machine brake, turn the motor by hand to rotate the traction machine, run slowly, and check the operation and temperature of the traction machine; 1) Lift the car and remove the elevator traction rope from the traction wheel, restore the electrical circuit to check the motor and brake circuit removed during the test; 2) Brake test adjustment. Power the brake coil separately, the gap between the brake shoe and the brake wheel should be uniform, within 0.7mm, and there should be no friction; the coil joint should be reliable and not loose, the outside of the coil must be well insulated, and its current value should be adjusted reasonably. Too small current will result in insufficient attraction, too large current will result in too rapid attraction, and cause the coil temperature to rise too high. The coil temperature rise should not exceed 60℃. In order to prevent the two cores from colliding with each other when they are attracted, the gap between the bottom of the two cores after attraction should be adjusted to 0.5-1mm, but this gap should not affect the rapid attraction of the cores; there should be no brake release hysteresis. Under normal circumstances, the brake release time should not be greater than 0.08s; the brake spring should be adjusted appropriately. If the braking force is too small, it will affect the accuracy of the leveling, and even cause the car to slip when stopping, which is dangerous. Excessive braking force will affect the stability of the car leveling. When the elevator is tested for static load and overloaded, the clamping force of the brake spring should enable the elevator to brake reliably; the brake release device should be tested reliably; the adjustment screws and locking nuts must not be loose, the pins should rotate freely, and the brake wheel and brake shoe should be free of oil or paint; 3) Turn the motor by hand to make it rotate. If there is no obstruction and the sound is normal, start the motor to run slowly; check the operation of each component and the temperature rise of the motor bearing. If there is a problem, stop the car in time. If the operation is normal, try it for 5 minutes and then change it to fast operation, and continue to check the operation and temperature of each component.

[0096] The bearing temperature requirement is: oil cup lubrication should not exceed 75℃, and rolling bearing should not exceed 85℃. If it is a DC elevator, check the brushes of the DC motor to see if they are in good contact and in the correct position, and observe whether the direction of the motor is consistent with the running direction. If the situation is normal, the test run is completed after continuous forward and reverse operation for 2.5 hours each. During the test run, the no-load current of the motor should be measured and should meet the requirements.

[0097] Fast test run test: seal the door opening mechanism, run at fast speed, test and adjust the elevator's signal system, control system, and drive system, adjust the elevator's start, acceleration, speed change, braking, leveling, and forced deceleration switches, limit switches, limit switches, and safety switches, set the elevator acceleration and deceleration time, and adjust the position of the leveling sensor; 1) After the test run is normal in the maintenance state, the doors of each floor are closed and the door locks are reliable before the fast state operation can be carried out; 2) Seal the door opening mechanism, run at fast speed, and continue to check the moving parts, focusing on the leakage of lubricating oil in the worm shaft extension. Oil stains are allowed, but after wiping, it is required that no oil is seen within 5 minutes of operation and no drops are formed within 15 minutes. The oil temperature shall not exceed 80℃, and the bearing temperature requirements are the same as before. Check the stability and noise of the traction machine, whether there is any gnawing sound, impact sound, bearing grinding sound in the reducer, and the sealing condition of each sealing surface, the looseness and braking condition of the brake, etc. At the maximum speed of the motor, the test run ends after continuous forward and reverse operation for 2 hours each. During the test run, the current of the motor should be tested; 3) Drive the car slowly and stop it at the middle floor. No one is in the car. According to the operating requirements, manually simulate the start of the car in the control cabinet of the machine room. First single-layer, then multi-layer, up and down several times (not to the upper and lower terminals for the time being). If there is no problem, the tester enters the car and performs actual operation. During the test run, the signal system, control system, and drive system of the elevator are tested and adjusted to make them all normal. The positions of the elevator's start, acceleration, speed change, braking, leveling, forced deceleration switch, limit switch, limit switch, and safety switch are precisely adjusted, and the operation should be accurate, safe and reliable. The external call button and the command button are both functional. At the same time, the tester conducts further inspections and tests on the traction device, motor (and its current), and brake in the machine room; 4) Setting of acceleration and deceleration time: Adjust the control potentiometer so that there is no step during starting and braking, and the comfort is good. The purpose is to reduce the mechanical and current impact during speed switching, and to ensure the acceleration and deceleration requirements of the elevator; 5) Adjustment of the leveling sensor: During the initial adjustment, the distance between the upper and lower leveling sensors installed on the car top can be taken as the length of the magnetic isolation plate installed in the shaft plus about 100mm. During fine adjustment, the base station is used as the standard to adjust the position of the sensor, and the other stations adjust the position of each sensor plate in the shaft.

[0098] Automatic door adjustment test: adjust the door lever, adjust the position of the door speed travel switch, adjust the door machine control system to make the door open and close speed, and test the safety touch panel and photoelectric protection device to ensure reliable function;

[0099] Elevator function test and inspection: The elevator function test is carried out item by item according to the type of elevator and the characteristics of the control method.

[0100] Embodiment 3: A method for modifying a safety device of a power plant boiler inspection elevator comprises the following steps:

[0101] S1: Set overload and short circuit protection on the main power switch;

[0102] S2: A hydraulic buffer compression protection switch is set after the electrical safety switch. The hydraulic buffer compression protection switch in S2 is used to verify the connection status of the electrical safety switch in the normal extension position to ensure the normal operation of the elevator. The energy-consuming buffer in the safety device must be restored to the normal position in time after the compression action. When the reset spring breaks or the plunger is stuck, it is very dangerous that the buffer will lose its function when the car or counterweight hits the top or bottom again. The present invention verifies the normal extension position of the electrical safety switch by setting a hydraulic buffer compression protection switch. After verification, the electrical safety switch is controlled to be turned on, and the elevator can run;

[0103] S3: Set up motor overheat protection in the motor winding. The motor overheat protection set in S3 is buried in the motor winding, monitors the operating temperature of the motor winding, obtains the operating temperature value and compares it with the specified value, and then issues a cut-off or connect command to the control circuit. When the operating temperature of the motor winding rises to a value greater than the specified value, the motor overheat protection cuts off the control circuit of the elevator and stops the elevator; when the operating temperature of the motor winding drops below the specified value, the motor overheat protection automatically connects the control circuit and the elevator resumes operation;

[0104] S4: A limit overtravel protection switch is set on the car sill; a safety clamp action protection switch is set on the upper beam of the car frame, a limit protection switch is set before the action of the buffer, a safety window protection switch is set on the car, a speed limiter action protection switch is set on the car, a full load and overload protection switch is set on the car, and a rescue device is set in the car, and a safety touch plate protection device is set on the car door. The limit overtravel protection switch described in S4 is set between 50mm and the limit switch of the upper and lower terminal sill planes, and the elevator is controlled to stop after being triggered; a safety clamp action protection switch is set on the upper beam of the car frame in the form of manual reset, and the safety clamp action protection switch is linked with the traction machine to control the traction The machine is in emergency action, and the action of the safety clamp linkage device drives the action of the safety clamp action protection switch to force the traction machine to stop running; the limit protection switch is set before the action of the buffer to keep the contact disconnected during the compression of the buffer, and the limit protection switch and the limit switch do not act at the same time; the safety window protection switch is set on the car and is set to be less than or equal to 50mm from the edge of the car. The safety window protection switch is triggered to control the maintenance or express operation of the elevator to stop. The safety window set on the car opens upward. When the opening position exceeds the edge of the car by more than 50mm, the safety window protection switch is triggered, and the safety window protection switch stops the maintenance or express operation of the elevator immediately;

[0105] A speed limiter action protection switch is set in the car to detect the running speed of the car. If it is judged that the rated speed is exceeded, the power supply of the motor and the brake is cut off. The speed limiter action protection switch is a non-automatic reset switch. When the car reaches 120% of the rated speed, the speed limiter action protection switch quickly cuts off the power supply of the motor and the brake to stop the traction machine. Before the speed limiter action protection switch is reset, the elevator cannot be started; a full-load overload protection switch is set in the car to detect the real-time load of the car and control the operation mode of the car. When the car is loaded with 93% of the rated load, the full-load switch should be activated. The full-load overload protection switch controls the elevator to cancel the forward car loading function. When the load in the car is greater than When the rated load is preset, the full-load overload protection switch is activated, the overload light on the control panel of the full-load overload protection switch lights up and rings, and the elevator door cannot be closed, and the elevator cannot start running; an in-car rescue device is provided, the in-car rescue device includes an alarm system and an intercom system, the in-car rescue device is connected to the management system, the in-car rescue device is connected to an automatic charging emergency power supply, and once the normal power supply of the in-car rescue device fails, the automatic charging emergency power supply is automatically connected to supply power to the in-car rescue device to operate; a safety touch panel protection device is provided on the car door, the safety touch panel protection device detects the operating force of the car door, and the safety touch panel protection device controls the closing limit thrust of the car door. During the closing period of the car door, when the safety touch panel protection device detects that a foreign object is hit by the door, it controls the car door to automatically reopen. The force required for the safety touch panel protection device to prevent the door from closing is 160N;

[0106] S5: Emergency stop switches are installed in the machine room, car top and pit. In S5, the emergency stop switches are installed in the machine room, car top and pit. The emergency stop switches are triggered to control the elevator to stop immediately. The position of the emergency stop switch on the car top or in the pit is less than 1m from the entry position of the maintenance personnel. The emergency stop switch is a bistable switch and needs to be reset manually. Unintentional action should not restore the elevator to service;

[0107] S6: An emergency electric operation device is provided on the traction machine. The emergency electric operation device in S6 includes an emergency electric operation switch and an operation button. The emergency electric operation device is provided on one side of the traction machine. The emergency electric operation switch and the operation button should be provided at a position where the traction machine can be directly observed. The emergency electric operation device is linked to the electrical safety devices of the speed limiter, safety clamp, buffer, and terminal limit switch. The emergency electric operation device limits the speed of the car, and the car speed should not exceed 0.63m / s. The emergency electric operation device is not linked to the electrical safety protection of the floor door lock. The emergency electric operation device is used for elevator commissioning, maintenance, and troubleshooting. The emergency electric operation device does not invalidate the electrical safety protection of the floor door lock.

[0108] S7: A speed limiter steel rope tensioning protection switch, a compensating rope device protection switch and a brake travel switch are set on the cable. The speed limiter steel rope tensioning protection switch in S7 detects the falling distance of the counterweight wheel and the state of the steel rope, and controls the operation of the elevator. When the speed limiter steel rope tensioning protection switch detects that the counterweight wheel has fallen by more than 50mm or the steel rope is disconnected, the speed limiter steel rope tensioning protection switch is immediately disconnected to stop the elevator. The compensating rope device protection switch detects the elevator running speed, and the electrical safety switch is used to check the tension of the compensating rope. When the rated speed of the elevator exceeds 2.5m / s, the compensating rope device protection switch activates the compensating rope with a tensioning wheel, and the tension of the compensating rope is maintained by gravity. The electrical safety switch is used to check the tension and is responsible for auxiliary feedback regulation. The tail end of the protection switch of the compensation rope device is reliably connected; the brake travel switch is linked with the magnet action travel, and the brake opening and closing action is controlled by the magnet action travel. When the magnet action travel is equal to 1.5mm, the brake travel switch is closed, and when the magnet action travel is reset, the brake travel switch maintains the disconnection gap;

[0109] S8: a tachometer belt break protection switch is provided on the tachometer generator, and a protective cover is provided on the transmission belt. In S8, the tachometer belt break protection switch is installed on the tachometer generator, the tachometer belt break protection switch detects the running condition of the transmission belt, controls the emergency running action of the elevator, and a protective cover is provided on the transmission belt;

[0110] S9: Maintenance control devices are arranged on the car top, inside the car and in the machine room. In S9, the maintenance control devices are arranged on the car top, inside the car and in the machine room. The maintenance control device arranged on the car top has a higher priority than the maintenance control devices arranged inside the car and in the machine room. After the maintenance control device on the car top is connected, the maintenance control devices inside the car and in the machine room become invalid and cannot operate. During maintenance, all floor doors are closed for car movement. The maintenance control device links the normal operation and the operation of the automatic door. During maintenance operation, the normal operation and the operation of the automatic door are canceled. The maintenance control device controls the maintenance speed of the car. The maintenance speed does not exceed 0.63m / s and does not exceed the normal travel range of the car. The maintenance control device includes a maintenance switch and a continuous press button. The maintenance operation of the car is controlled by continuously pressing the button to prevent accidental operation. Continuously pressing the button indicates the control operation direction. The maintenance switch in the car is provided with a device to prevent misoperation. The maintenance switch is bistable and has protection against unintentional operation.

[0111] In this embodiment, a test method for the safety device of the boiler inspection elevator of a power plant includes a brake protection system test: the car descends at a rated speed with a preset rated load, the power supply of the motor and the brake is cut off, the operation of the car is detected, and the deceleration of the car is compared with the deceleration caused by the action of the safety clamp or the collision of the car on the buffer; when the car descends at a rated speed with a rated load of 130%, the power supply of the motor and the brake is cut off, and the car should be able to stop running. At the same time, the deceleration of the car should not exceed the deceleration caused by the action of the safety clamp or the collision of the car on the buffer.

[0112] Traction capacity balance protection test: Check the balance system number of the elevator, the balance system number range is set at 40% to 50%, test the car braking situation when the empty car moves upward within the upper range of the travel under the preset rated load and when the car is loaded and the car is downward within the lower range of the travel. When the counterweight is supported on the buffer compressed by it, check the action of the traction rope on the empty car. When the car stops at the bottom level position, add the preset rated load steadily for static load, and check the situation of each load-bearing component and the braking situation of the traction mechanism; 1) The balance system number of the elevator should be in the range of 40% to 50%. 1) When the car area cannot limit the load exceeding the rated value, stop the car at the bottom level position, steadily add 150% of the rated load for static load inspection, which lasts for 10 minutes, and check that all load-bearing components are free of damage and the traction mechanism is braked reliably without slipping.

[0113] Safety clamp test: Instantaneous safety clamp test, when the car has a uniformly distributed preset rated load and descends at the inspection speed, the speed limiter is controlled to operate, and the safety clamp should be tested on the car guide rail and the movement of the traction rope in the rope groove; Progressive safety clamp test, when the car has a uniformly distributed preset rated load and descends at the leveling speed or inspection speed, the installation adjustment and the firmness of the car assembly, guide rail and building connection are tested; the speed limiter action speed of the safety clamp corresponding to the counterweight set in the aisle or space where people pass under the elevator pit is compared with the speed limiter action speed of the car safety clamp; 1) Instantaneous safety clamp test, when the car has a uniformly distributed rated load and descends at the inspection speed, the speed limiter is controlled to operate. At this time, the safety clamp should stop the car on the guide rail and the traction rope should slip in the rope groove; 2) Progressive safety clamp test. The test is carried out under the condition that the car has an evenly distributed 130% rated load and is descending at the leveling speed or maintenance speed. The purpose of the test is to check whether the installation and adjustment are correct, as well as the firmness of the car assembly and the connection between the guide rails and the building; 3) When there is an aisle or space for people to pass under the elevator pit, a safety clamp should also be installed on the counterweight, and the speed limiter action speed should be higher than the speed limiter action speed of the car safety clamp, but not more than 10%.

[0114] Buffer test: For the spring energy storage buffer test, the car is at rated load and inspection speed; the counterweight is at no-load and inspection speed, respectively, and the tension of the traction rope is tested; for the hydraulic energy dissipation buffer test, the car or counterweight with rated load should contact the buffer at the inspection speed and be compressed for a predetermined time, and then the reset time from the car or counterweight starting to leave the buffer until the buffer returns to its original state is tested. The reset time interval is 100s; 1) For the spring energy storage buffer test, the car is at rated load and inspection speed; the counterweight is at no-load and inspection speed, respectively, and the traction rope is relaxed; 2) Energy dissipation (hydraulic) buffer test. The car or counterweight with rated load should contact the buffer at the inspection speed and be compressed for 5 minutes, and then the car or counterweight starts to leave the buffer until the buffer returns to its original state, and the time required should be less than 100s.

[0115] Static test adjustment inspection: The electrical circuit is not connected to the motor, the traction machine is not equipped with a car, and the test run is performed without load.

[0116] Elevator system inspection: Check the manual turning or maintenance slow car operation, check the gap between the door opening knife and the door sills of each floor, check the gap between the door lock wheels of each floor and the car sill, check the relevant gaps of the leveling device, check the position relationship between the limit switch, forced deceleration switch and the touch iron, check the gap between the outermost end of the car and the parallel wall, check the gap between the car components and the guide rail bracket, wire trough, intermediate junction box, check the distance between the accompanying cable, compensation chain, counterweight and various components of the shaft.

[0117] Traction machine test run inspection: remove the traction rope from the traction wheel, restore the electrical circuit motor and brake circuit, test and adjust the traction machine brake, turn the motor by hand to rotate the traction machine, run slowly, and check the operation and temperature of the traction machine; 1) Lift the car and remove the elevator traction rope from the traction wheel, restore the electrical circuit to check the motor and brake circuit removed during the test; 2) Brake test adjustment. Power the brake coil separately, the gap between the brake shoe and the brake wheel should be uniform, within 0.7mm, and there should be no friction; the coil joint should be reliable and not loose, the outside of the coil must be well insulated, and its current value should be adjusted reasonably. Too small current will result in insufficient attraction, too large current will result in too rapid attraction, and cause the coil temperature to rise too high. The coil temperature rise should not exceed 60℃. In order to prevent the two cores from colliding with each other when they are attracted, the gap between the bottom of the two cores after attraction should be adjusted to 0.5-1mm, but this gap should not affect the rapid attraction of the cores; there should be no brake release hysteresis. Under normal circumstances, the brake release time should not be greater than 0.08s; the brake spring should be adjusted appropriately. If the braking force is too small, it will affect the accuracy of the leveling, and even cause the car to slip when stopping, which is dangerous. Excessive braking force will affect the stability of the car leveling. When the elevator is tested for static load and overloaded, the clamping force of the brake spring should enable the elevator to brake reliably; the brake release device should be tested reliably; the adjustment screws and locking nuts must not be loose, the pins should rotate freely, and the brake wheel and brake shoe should be free of oil or paint; 3) Turn the motor by hand to make it rotate. If there is no obstruction and the sound is normal, start the motor to run slowly; check the operation of each component and the temperature rise of the motor bearing. If there is a problem, stop the car in time. If the operation is normal, try it for 5 minutes and then change it to fast operation, and continue to check the operation and temperature of each component.

[0118] The bearing temperature requirement is: oil cup lubrication should not exceed 75℃, and rolling bearing should not exceed 85℃. If it is a DC elevator, check the brushes of the DC motor to see if they are in good contact and in the correct position, and observe whether the direction of the motor is consistent with the running direction. If the situation is normal, the test run is completed after continuous forward and reverse operation for 2.5 hours each. During the test run, the no-load current of the motor should be measured and should meet the requirements.

[0119] Fast test run inspection: seal the door opening mechanism, run at fast speed, test and adjust the elevator's signal system, control system, and drive system, adjust the positions of the elevator's start, acceleration, speed change, braking, leveling, and forced deceleration switches, limit switches, limit switches, and safety switches, set the elevator's acceleration and deceleration time, and adjust the position of the leveling sensor; 1) After the test run is normal in the maintenance state, the doors of each floor are closed and the door locks are reliable before the fast state operation can be carried out; 2) Seal the door opening mechanism, run at fast speed, and continue to check each moving part, focusing on the leakage of lubricating oil in the worm shaft extension. Oil stains are allowed, but after wiping, it is required that no oil is seen within 5 minutes of operation and no drops are formed within 15 minutes. The oil temperature shall not exceed 80℃, and the bearing temperature requirements are the same as before. Check the stability and noise of the traction machine, whether there is any gnawing sound, impact sound, bearing grinding sound in the reducer, and the sealing condition of each sealing surface, the looseness and braking condition of the brake. At the maximum speed of the motor, the test run ends after continuous forward and reverse operation for 2 hours each. During the test run, the current of the motor should be tested; 3) Drive the car slowly and stop it at the middle floor. No one is in the car. According to the operating requirements, manually simulate the start of the car in the control cabinet of the machine room. First single-layer, then multi-layer, up and down several times (not to the upper and lower terminals for the time being). If there is no problem, the tester enters the car and performs actual operation. During the test run, the signal system, control system, and drive system of the elevator are tested and adjusted to make them all normal. The positions of the elevator's start, acceleration, speed change, braking, leveling, forced deceleration switch, limit switch, limit switch, and safety switch are precisely adjusted, and the operation should be accurate, safe and reliable. The external call button and the command button are both functional. At the same time, the tester conducts further inspections and tests on the traction device, motor (and its current), and brake in the machine room; 4) Setting of acceleration and deceleration time: Adjust the control potentiometer so that there is no step during starting and braking, and the comfort is good. The purpose is to reduce the mechanical and current impact during speed switching, and to ensure the acceleration and deceleration requirements of the elevator; 5) Adjustment of the leveling sensor: During the initial adjustment, the distance between the upper and lower leveling sensors installed on the car top can be taken as the length of the magnetic isolation plate installed in the shaft plus about 100mm. During fine adjustment, the base station is used as the standard to adjust the position of the sensor, and the other stations adjust the position of each sensor plate in the shaft.

[0120] Automatic door adjustment test: adjust the door lever, adjust the position of the door speed travel switch, adjust the door machine control system to make the door open and close speed, and test the safety touch panel and photoelectric protection device to ensure reliable function;

[0121] Elevator function test and inspection: The elevator function test is carried out item by item according to the type of elevator and the characteristics of the control method.

[0122] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for modifying the safety device of a power plant boiler inspection elevator, characterized in that: The following steps are involved: S1: Set overload and short circuit protection on the main power switch; S2: A hydraulic buffer compression protection switch is set after the electrical safety switch; S3: Set motor overheat protection on the motor winding; S4: A limit overtravel protection switch is set on the car sill; a safety clamp action protection switch is set on the car frame beam, a limit protection switch is set before the buffer action, a safety window protection switch is set on the car, a speed limiter action protection switch is set on the car, a full load and overload protection switch is set on the car, and a rescue device is set in the car, and a safety touch plate protection device is set on the car door; S5: Install emergency stop switches in the machine room, car roof and pit; S6: Install an emergency electric running device on the traction machine; S7: Set a speed limiter steel rope tensioning protection switch, a compensation rope device protection switch and a brake travel switch on the cable; S8: A tachometer belt break protection switch is provided on the tachometer generator, and a protective cover is provided on the transmission belt; S9: Maintenance control devices are installed on the car roof, inside the car and in the machine room.

2. A method for modifying the safety device of a power plant boiler inspection elevator according to claim 1, characterized in that: The hydraulic buffer compression protection switch described in S2 is used to verify the connection status of the electrical safety switch in the normal extension position to ensure the normal operation of the elevator.

3. A method for modifying the safety device of a power plant boiler inspection elevator according to claim 1, characterized in that: The motor overheat protection provided in S3 is embedded in the motor winding, monitors the operating temperature of the motor winding, obtains the operating temperature value and compares it with the specified value, and then issues a cut-off or connect instruction to the control circuit.

4. A method for modifying the safety device of a power plant boiler inspection elevator according to claim 1, characterized in that: The limit overtravel protection switch described in S4 is set between 50mm and the limit switch of the upper and lower station sill planes, and the elevator is controlled to stop operating after being triggered; a safety clamp action protection switch is set on the upper beam of the car frame in the form of manual reset, and the safety clamp action protection switch is linked with the traction machine to control the emergency action of the traction machine; The limit protection switch is set before the buffer is operated to keep the contact disconnected during the compression of the buffer, and the limit protection switch and the limit switch do not operate at the same time; The safety window protection switch is set on the car and is set less than or equal to 50mm from the edge of the car. The safety window protection switch is triggered to control the elevator to stop during maintenance or express operation; A speed limiter action protection switch is arranged in the car to detect the running speed of the car and cut off the power supply of the motor and the brake when it is judged to exceed the rated speed. The speed limiter action protection switch is a non-automatic reset switch; A full-load and overload protection switch is installed in the car to detect the real-time load of the car and control the operation mode of the car; An in-car rescue device is provided, the in-car rescue device includes an alarm system and an intercom system, the in-car rescue device is connected to a management system, and the in-car rescue device is connected to an automatically rechargeable emergency power supply; A safety touch panel protection device is arranged on the car door, and the safety touch panel protection device detects the operating force of the car door and controls the closing limit thrust of the car door.

5. A method for modifying the safety device of a power plant boiler inspection elevator according to claim 1, characterized in that: In S5, the emergency stop switch is installed in the machine room, car top and pit. The position of the emergency stop switch on the car top or in the pit is less than 1m away from the entry position of the maintenance personnel. The emergency stop switch is a bistable switch.

6. A method for modifying the safety device of a power plant boiler inspection elevator according to claim 1, characterized in that: In S6, the emergency electric operation device includes an emergency electric operation switch and an operation button. The emergency electric operation device is arranged on one side of the traction machine. The emergency electric operation device is linked to the electrical safety devices of the speed limiter, safety clamp, buffer, and terminal limit switch. The emergency electric operation device limits the running speed of the car. The emergency electric operation device is not linked to the electrical safety protection of the floor door lock.

7. A method for modifying the safety device of a power plant boiler inspection elevator according to claim 1, characterized in that: The speed limiter rope tensioning protection switch in S7 detects the falling distance of the counterweight wheel and the state of the rope to control the operation of the elevator; The compensation rope device protection switch detects the elevator running speed, and the electrical safety switch checks the tension of the compensation rope; The brake travel switch is linked to the magnet action travel, and the brake opening and closing action is controlled by the magnet action travel.

8. A method for modifying the safety device of a power plant boiler inspection elevator according to claim 1, characterized in that: In S8, the tachometer belt break protection switch is installed on the tachometer generator. The tachometer belt break protection switch detects the running condition of the transmission belt and controls the emergency operation of the elevator. A protective cover is set on the transmission belt.

9. A method for modifying the safety device of a power plant boiler inspection elevator according to claim 1, characterized in that: In S9, the maintenance control device is arranged on the top of the car, inside the car and in the machine room. The maintenance control device arranged on the top of the car has a higher priority than the maintenance control devices arranged inside the car and in the machine room. The maintenance control device links the normal operation and the action of the automatic door. The maintenance control device controls the maintenance speed of the car. The maintenance control device includes a maintenance switch and a continuous press button. The maintenance switch is bistable and has protection against unintentional operation.

10. A method for testing a safety device of a boiler inspection elevator in a power plant, characterized in that: Including brake protection system test: the car moves downward at the rated speed with the preset rated load, cuts off the power supply to the motor and brake, checks the operation of the car and compares the car deceleration with the deceleration caused by the action of the safety clamp or the car hitting the buffer; Traction capacity balance protection test: Check the balance system of the elevator, test the car braking condition of the empty car in the upper range of the preset rated load and the car braking condition of the loaded car in the lower range of the travel, and check the action of the traction rope on the empty car when the counterweight is supported on the buffer compressed by it. When the car stops at the bottom floor level position, add the preset rated load steadily for static load, and check the condition of each load-bearing component and the braking condition of the traction mechanism; Safety clamp test: Instantaneous safety clamp test, when the car has a uniformly distributed preset rated load and descends at the inspection speed, the speed limiter is controlled to operate, and the safety clamp should be tested on the car guide rail and the movement of the traction rope in the rope groove; Progressive safety clamp test, with a preset rated load evenly distributed in the car, descending at the leveling speed or inspection speed to check the installation and adjustment, car assembly, and the firmness of the connection between the guide rail and the building; Detect the speed of the speed limiter of the safety clamp of the counterweight installed in the aisle or space below the elevator pit where people pass by, compared with the speed limiter of the car safety clamp; Buffer test: For spring energy storage buffer, the car is tested at rated load and inspection speed; the counterweight collides with the buffer when the car is empty and at inspection speed to test the tension of the traction rope; For the inspection of hydraulic energy-absorbing buffers, the car or counterweight with rated load shall contact the buffer at the inspection speed and be compressed for a predetermined time, and then the reset time from the car or counterweight starting to leave the buffer until the buffer returns to its original state shall be inspected; Static test adjustment test: the electrical circuit is not connected to the motor, the traction machine is not equipped with a car, and the test run is carried out without load; Elevator system inspection: Check the manual turning or maintenance slow running, check the clearance between the door opening knife and the door sills of each floor, check the clearance between the door lock wheels of each floor and the car sill, check the relevant clearances of the leveling device, check the position relationship between the limit switch, forced deceleration switch and the iron contact, check the clearance between the outermost end of the car and the parallel wall, check the clearance between the car components and the guide rail bracket, wire trough, and intermediate junction box, check the distance between the accompanying cable, compensation chain, counterweight and various parts of the shaft; Traction machine test run inspection: remove the traction rope from the traction wheel, restore the electrical circuit motor and brake circuit, test and adjust the traction machine brake, turn the motor by hand to rotate the traction machine, run it at a slow speed, and check the operation and temperature of the traction machine; Fast train test run: seal the door opening mechanism, run the fast train, test and adjust the elevator's signal system, control system, and drive system, adjust the positions of the elevator's start, acceleration, speed change, braking, leveling, and forced deceleration switches, limit switches, limit switches, and safety switches, set the elevator's acceleration and deceleration time, and adjust the position of the leveling sensor; Automatic door adjustment test: adjust the door lever, adjust the position of the door speed travel switch, adjust the door machine control system to make the door open and close speed, and test the safety touch panel and photoelectric protection device to ensure reliable function; Elevator function test and inspection: The elevator function test is carried out item by item according to the type of elevator and the characteristics of the control method.