CN113942943A

CN113942943A - Device and method for monitoring safe operation of crane

Info

Publication number: CN113942943A
Application number: CN202111336718.4A
Authority: CN
Inventors: 马赫; 蔺宇
Original assignee: Tianjin Tianan Crane Electric Equitment Co ltd
Current assignee: Tianjin Tianan Crane Electric Equitment Co ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-01-18
Anticipated expiration: 2041-11-12
Also published as: CN113942943B

Abstract

The invention relates to a device and a method for monitoring the safe operation of a crane, wherein the device comprises an MCU monitoring circuit and MCU monitoring software, wherein the MCU monitoring circuit comprises an MCU module, a power supply module, a three-phase electric sampling module, two isolation detection modules and an output switch isolation driving module; the two isolation detection modules are respectively connected with the crane safety protection switch and the crane input request switch, the output switch isolation driving module is connected with the relay switch control circuit, the MCU module determines the output switch state according to the crane switch state and controls the relay switch state through the isolation driving module to control the circuit to control the crane to work, and the MCU monitoring software is installed in the MCU module to realize the detection and control functions. The crane safety management system is reasonable in design, achieves the comprehensive management function of the safe operation of the crane, and plays an important role in the safe use of the crane, the reduction of the integration cost of electrical components of the crane, the recording of the use information of the crane and the identification of the fault of the crane.

Description

Device and method for monitoring safe operation of crane

Technical Field

The invention belongs to the field of cranes, relates to a crane safe operation monitoring technology, and particularly relates to a device and a method for monitoring the safe operation of a crane.

Background

As the application of the crane becomes more and more extensive, the electrical control of the crane becomes more and more complex, and therefore, the safety requirements of the crane become more and more strict. At present, in the prior art, an electrification monitoring system formed by combining different control units is generally adopted to realize the safety monitoring function of the crane, so that extra initial purchase cost and later maintenance cost are brought. However, how to monitor the safe use of the crane and record the working state in real time so as to maintain and timely remove the fault of the equipment is a problem which needs to be solved urgently at present.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the device and the method for monitoring the safe operation of the crane, which have reasonable design and can effectively and comprehensively manage the safe operation of the crane.

The invention solves the technical problems in the prior art by adopting the following technical scheme:

a device for monitoring the safe operation of a crane comprises an MCU monitoring circuit and MCU monitoring software, wherein the MCU monitoring circuit comprises an MCU module, a power supply module, a three-phase electric sampling module, two isolation detection modules and an output switch isolation driving module; the power module and the three-phase electric sampling circuit are connected with a 380V alternating current power supply, the power module outputs direct current to supply power for other modules, the three-phase electric sampling module transmits sampling signals to the MCU module, the two isolation detection modules are respectively connected with the crane safety protection switch and the crane input request switch, the output switch isolation driving module is connected with the relay switch control circuit, the two isolation detection modules transmit switch state signals to the output switch isolation driving module on one hand, and transmit the switch state signals to the MCU module on the other hand, the MCU module determines the output switch state according to the crane switch state and controls the crane to work by controlling the circuit through the state of the isolation driving module to control the relay switch, and the MCU monitoring software is installed in the MCU module to realize the detection and control functions.

Furthermore, the MCU module is also connected with two RS485 isolation communication modules and a Bluetooth communication module, one 485 communication isolation module is connected with an MODBUS host, and the MCU module is communicated with the MODBUS host through the 485 communication isolation module to realize a data interaction function; the other 485 communication isolation module is connected with a sensor or a sensor instrument, and the MCU module performs data interaction with the sensor or the sensor instrument through the 485 communication isolation module to detect the safety state of the crane; the MCU module is connected with the mobile phone through the Bluetooth communication module to realize a data interaction function with the mobile phone.

Furthermore, a normally open relay switch is adopted as a relay switch in the relay switch control circuit, a 24V power supply provides driving voltage for a relay control coil, the relay switch is connected to a contactor control coil or a frequency converter input switch of the crane, and the contactor control coil or the frequency converter input switch is connected with a crane motor for controlling the crane to work; the power supply loop of the relay control coil is connected with a crane input request switch, a crane safety protection switch and a built-in electronic switch, the built-in electronic switch is realized by switching on and off of current at the output end of an optical coupling element, the input end of the optical coupling element is connected to a digital port of an MCU module, and the high and low level output by the MCU module controls the on and off of the optical coupling element to realize the control function of the relay switch; and arc extinguishing circuits formed by piezoresistors are also connected in the relay control coil loop and the load circuit.

Further, the MCU monitoring software includes:

the safety logic control software module: controlling the on-off of the electronic switch by controlling the output level of the port of the single chip microcomputer according to the state of the crane input request switch, the state of the crane safety protection switch, the configurable timer and the configurable fault action code;

the safety protection switch abnormal state detection software module comprises: determining whether the safety protection switch works abnormally and has potential safety hazards according to the state of the safety protection switch of the crane, the state of the electronic switch and the incidence relation of the states;

data record management software module: the data recording management software module is used for realizing the recording function of the safety protection switch abnormal state detection software module and storing data in a flash memory inside the MCU module, and the data recording management software module transmits the recorded data to a mobile phone or an MODBUS host through the Bluetooth communication module or the RS485 communication isolation module for analysis and use by a user;

the crane working condition abnormal state detection software module comprises: the system is used for detecting the actual working condition of the crane, and if the actual working condition exceeds the rated range, the data recording management software module is informed to record the abnormal working condition;

the crane safety component detection software module comprises: the safety component alarm system is used for detecting the working time and the working load of the safety component, and if the working time and the working load exceed the rated range, the data record management software module is informed to record the alarm of the safety component;

the crane operation information statistics software module comprises: the system is used for counting the total working time, the total action times, the total lifting distance and the total walking distance of the crane and sending the counted information to a data recording management software module to record the data.

Further, the configurable timer and the configurable fault action code are configured through an MODBUS host or a mobile phone; the data required by the crane working condition abnormal state detection software module, the data required by the crane safety component detection software module and the data required by the crane safety component detection software module are transmitted through a sensor or a sensor instrument connected with the RS485 isolation module.

A method of monitoring the safe operation of a crane, comprising the steps of:

step 1, the MCU module determines the switch state of a safety logic switch according to a crane input request switch, a crane safety protection switch, a fault action code and a timer;

step 2, determining the state of an output switch and controlling the operation of the crane according to the safety logic switch, the crane input request switch and the safety protection switch;

step 3, the MCU module detects the fault of the safety switch;

and 4, monitoring the working condition and the state of the key safety part of the crane in real time by the MCU module.

Further, the step 4 is followed by the steps of:

step 5, the MCU module communicates with external equipment and transmits a detection result to the external equipment; the external equipment is an MODBUS host or a mobile phone, the MCU module performs data interaction with the MODBUS host through the RS485 communication isolation module, and the MCU module performs data interaction with the mobile phone through the Bluetooth communication module; and the MCU module transmits data recorded in the fault detection of the safety switch and data recorded in the states of the working condition and the key safety parts of the crane to the MODBUS host or the mobile phone.

Further, the crane input request switch is an operating handle key switch, a remote controller output switch or a programmable switch, and the types of the input request switches comprise emergency stop, main starting, ascending, descending, ascending 1 speed, ascending 2 speed, left trolley traveling, right trolley traveling, acceleration of the trolley, forward traveling of the cart, backward traveling of the cart and acceleration of the cart; the crane safety protection switch comprises a main control switch, a lifting limit switch, a descending limit switch, a lifting overload switch, a lifting overheat switch, a left trolley limit switch, a right trolley limit switch, a front trolley limit switch and a rear trolley limit switch.

Further, the specific implementation method of step 3 is as follows:

(1) reading switch signals of a crane input request switch and a crane safety protection switch, and acquiring the on or off state of the safety protection switch;

(2) when the safety protection switch is disconnected, counting and recording the total times of the disconnection of the switch; and judging the fault of the safety protection switch according to the state of the output switch, counting and recording the total times of the switch fault if the fault is the fault, and recording the type of the switch fault which recently appears.

Further, the specific implementation method of step 4 is as follows: the MCU module carries out working condition abnormity detection, safety component abnormity detection and crane operation information statistics according to the state of the output switch;

the working condition abnormity detection comprises a load frequency spectrum, an electrifying duration, an electrifying frequency and a full-load working actual time; when the working condition of the crane exceeds the use range, recording and alarming;

the crane key safety part abnormity detection comprises a brake device, a motor, a steel wire rope and a contactor; when the key safety part is abnormal, recording and alarming;

the crane operation information statistics comprises: including total working time, total number of actions, total lifting distance and total walking distance.

The invention has the advantages and positive effects that:

1. the monitoring device of the invention detects the states of the input request switch and the safety protection switch of the crane and controls the action of the crane through the output switch, and notifies a user in time and keeps related operation historical data once an accident or a safety requirement occurs, thereby not only ensuring the safe operation of the crane to the maximum extent, but also eliminating faults in time, and reducing the cost of the configuration and assembly of electrical appliances of the crane.

2. The monitoring method of the invention controls the switch output state through the safety logic switch, the input request switch and the safety protection switch together, realizes more reliable output switch control function, effectively manages the crane input request switch and the crane safety switch signal, displays the states of the input request switch and the crane safety switch in real time, and records the abnormal condition of the safety protection switch; monitoring the operating condition of the crane and the state of a safety component, and alarming and recording when abnormality occurs; counting data information of crane operation; and a data communication interface which is convenient for the outside to read the safety information is provided.

3. The crane safety management system is reasonable in design, achieves the comprehensive management function of the safe operation of the crane, and plays an important role in the safe use of the crane, the reduction of the integration cost of electrical components of the crane, the recording of the use information of the crane and the identification of the fault of the crane.

Drawings

FIG. 1 is a schematic diagram of the hardware functional modules of the monitoring device of the present invention;

FIG. 2 is a schematic diagram of a relay switch output control circuit of the present invention;

FIG. 3 is a schematic diagram of the software functional modules of the monitoring device of the present invention;

FIG. 4 is a flow chart of the security logic control software module of the monitoring device of the present invention;

FIG. 5 is a flow chart of a safety switch fault detection software module of the monitoring device of the present invention;

FIG. 6 is a functional block diagram of a monitoring method of the present invention;

FIG. 7 is a logic diagram of the logic switch state control of the present invention;

FIG. 8 is a block diagram of the output switch control of the present invention;

fig. 9 is a logic diagram of the failure determination of the safety protection switch according to the present invention.

Detailed Description

The embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The invention provides a device for monitoring the safe operation of a crane, which comprises an MCU monitoring circuit and MCU monitoring software as shown in figures 1 and 2.

The MCU monitoring circuit comprises an MCU module, a main power isolation module, a 24V-to-5V module, a 24V-to-3.3V module, a three-phase electric sampling module, two isolation detection modules, an output switch isolation driving module, a 485 communication isolation module and a Bluetooth communication module. The main power isolation module is connected with a 380V alternating current power supply, the main power isolation module outputs a 24V direct current power supply after carrying out voltage transformation on the 380V alternating current power supply, the 24V direct current power supply is respectively connected with a 24V to 5V module, a 24V to 3.3V module, two isolation detection modules and an output switch isolation driving module to supply power to the modules, the 24V to 5V module and the 24V to 3.3V module respectively output 5V and 3.3V voltages after carrying out voltage conversion and are connected to two 485 communication isolation modules to supply power to the 485 communication isolation modules (wherein 5V supplies power to an isolation end, and 3.3V supplies power to a non-isolation end), and the 3.3V voltage output by the 24V to 3.3V module is connected with an MCU module and a Bluetooth communication module to supply power to the 485 communication modules. The three-phase electric sampling module is connected with a 380V alternating current power supply and used for converting a three-phase alternating current signal into a square signal (with a numerical value of 0 and 1), and the MCU module is connected with the three-phase electric sampling module and used for detecting a 380V alternating current state. The two isolation detection modules and the output switch isolation driving module are respectively connected with the crane safety protection switch, the crane input request switch and the relay switch control circuit, the MCU module is connected with the two isolation detection modules and the output switch isolation driving module to realize the state detection and control functions of the switch state, on one hand, the two isolation detection modules transmit the switch state signal to the MCU module, and on the other hand, the two isolation detection modules also transmit the switch state signal to the output switch isolation driving module. A485 communication isolation module connects MODBUS host computer, the MCU module carries out the communication through 485 communication isolation module and MODBUS host computer and can control safety monitor and acquire safety monitor's data, and a plurality of safety monitor can be connected to the MODBUS host computer. The other 485 communication isolation module is connected with a sensor or a sensor instrument, the MCU module is communicated with the 485 communication isolation module, and the safety state of the crane is detected by combining data of the sensor or the sensor instrument. The MCU module is connected with the mobile phone through the Bluetooth communication module to realize the wireless communication function with the mobile phone.

In this embodiment, as shown in fig. 2, a relay switch control circuit in which a normally open relay switch is used as a relay switch and a relay control coil is supplied with a driving voltage from a 24V power supply is provided. The relay switch is connected to a contactor control coil or a frequency converter input switch of the crane, and the contactor control coil or the frequency converter input switch is connected with a crane motor and used for controlling the crane to work.

The relay control coil power supply loop is connected with a crane input request switch, a crane safety protection switch and a built-in electronic switch. The crane input request switch is a passive switch and is connected with the negative end of a 24V power supply. The safety protection switch of the crane is a passive switch and is connected with the positive end of a 24V power supply. The built-in electronic switch is realized by on-off of current at the output end of the optical coupling element, the input end of the optical coupling element is connected to the digital port of the MCU module, and the high and low levels output by the MCU module can control the on-off of the optical coupling element so as to control the work of a relay switch. One end of the same group of switches in the relay switch group is connected with the same common point, the other end of the same group of switches is called an output end, and the output end of the switch is connected with the common point when the relay switch is closed.

The crane input request switch may be an operating handle key switch, a remote controller output switch or a Programmable (PLC) output switch, and the types of the input request switch include, but are not limited to: scram, main start, rise, fall, rise 1 speed, rise 2 speed, dolly left side, dolly right side, dolly acceleration, cart forward, cart backward, cart acceleration, etc.

The crane safety protection switch includes but is not limited to: main control, ascending limit, descending limit, ascending overload, ascending overheat, left limit of the trolley, right limit of the trolley, front limit of the trolley, rear limit of the trolley and the like.

And an arc extinguishing circuit formed by a piezoresistor is also connected in the relay control coil loop and the load circuit, so that the arc extinguishing function of the relay is realized.

The MCU monitoring software comprises a safety logic control software module, a safety protection switch abnormal state detection software module, a data recording management software module, a crane working condition abnormal state detection software module, a crane safety component detection software module and a crane operation information statistics software module, and is shown in figure 3.

The safety logic control software module, as shown in fig. 4, controls the on/off of the electronic switch by controlling the level of the output level of the port of the single chip according to the state of the crane input request switch, the state of the crane safety protection switch, the configurable timer and the configurable fault action code. And the timing delay time and the fault action code are configured through an MODBUS host or a mobile phone.

As shown in fig. 5, the software module for detecting the abnormal state of the safety protection switch determines whether the safety protection switch works abnormally and has potential safety hazard according to the state of the crane safety protection switch, the state of the electronic switch and the incidence relation of the states.

And the data recording management software module is used for realizing the recording function of the safety protection switch abnormal state detection software module and storing data in a flash memory in the MCU module. The data recording management software module can also transmit the recorded data to a mobile phone or an MODBUS host through the Bluetooth communication module or the RS485 communication isolation module for analysis and use by a user.

The crane working condition abnormal state detection software module is used for detecting the actual working condition of the crane, including whether the load frequency spectrum, the electrifying duration rate, the electrifying frequency, the full-load working actual time and the like of the lifting exceed the rated working level, and if the actual working condition exceeds the rated range, the data recording management software module is informed to record the abnormal working condition. The sensor data required by the crane working condition abnormal state detection software module, such as real-time lifting capacity, can be transmitted to the software module through the sensor or the sensor instrument connected with the RS485 isolation module.

The crane safety component detection software module comprises a brake device, a motor, a steel wire rope, a contactor and the like, detects the working time and the working load of the safety component, and informs the data record management software module of claim 1.14 to record the alarm of the safety component if the working time and the working load exceed the rated range. The crane safety component detects sensor data required by the software module, such as real-time lifting capacity, real-time hook position, real-time current and the like, and can be transmitted to the software module through the sensor or the sensor instrument connected with the RS485 isolation module.

The crane operation information statistics software module counts the total working time, the total action times, the total lifting distance, the total walking distance and the like, and the counted information is sent to the data recording management software module to record the data. The sensor data required by the crane safety component to detect the software module, such as the real-time hook position, can be transmitted to the software module through the sensor or sensor instrument connected with the RS485 isolation module.

Based on the device for monitoring the safe operation of the crane, the invention also provides a method for monitoring the safe operation of the crane, which comprises the following steps as shown in fig. 6:

step 1, the MCU module determines the switch state of the safety logic switch according to the crane input request switch, the crane safety protection switch, the fault action code and the timer.

The crane input request switch may be an operating handle key switch, a remote controller output switch, or a Programmable (PLC) output switch, and the types of input request switches include, but are not limited to: scram, main start, rise, fall, rise 1 speed, rise 2 speed, dolly left side, dolly right side, dolly acceleration, cart forward, cart backward, cart acceleration, etc.

Crane safety protection switches include, but are not limited to: main control, ascending limit, descending limit, ascending overload, ascending overheat, left limit of the trolley, right limit of the trolley, front limit of the trolley, rear limit of the trolley and the like.

The timer can configure the crane state switching delay time, and when the timing is up, the safety logic switch is closed. The fault action code may configure the safety logic switch to open when a certain fault is detected (when the fault action code is valid).

The timer and the fault action code can be configured through the communication between the MCU module and the MODBUS host or the mobile phone.

The processing procedure of this step is shown in fig. 7.

And 2, determining the state of an output switch and controlling the operation of the crane according to the safety logic switch, the crane input request switch and the safety protection switch.

As shown in fig. 8, the safety logic switch, the crane input request switch and the safety protection switch are connected in series to the output switch control unit, and when any one of the three switches is turned off, the output switch control unit is powered off. When the power supply is powered on, the output switch is closed, and when the power supply is powered off, the output switch is opened. In the present embodiment, the output switch control unit is implemented by a relay switch control circuit.

And 3, detecting the fault of the safety switch by the MCU module.

The specific implementation method of the step is as follows:

(1) reading a crane input request switch and a switch signal of crane safety protection, wherein the switch signal comprises a state of acquiring the pressing or releasing of the crane input request switch and a state of acquiring the closing or opening of the safety protection switch.

(2) When the safety protection switch is disconnected, counting and recording the total times of the disconnection of the switch; and judging the fault of the safety protection switch according to the state of the output switch, counting and recording the total times of the switch faults if the fault is the fault, and recording the type of the switch fault which recently appears.

As shown in fig. 9, the method for determining the failure of the safety protection switch, if the safety switch is turned off, checking whether the current state of the crane may cause the safety switch to be turned off, if not, recording the failure of the safety switch; if possible, only the off state of the safety switch is recorded; if the safety switch is changed from an open state to a closed state, checking whether the current state of the crane is possible to remove the open protection of the safety switch, if not, recording the fault of the safety switch, otherwise, judging that the safety switch has no fault.

In the step, the MCU module carries out working condition abnormity detection, safety component abnormity detection and crane operation information statistics according to the output switch state.

The operating condition of the crane is the operating class of the crane. In this step, the abnormal detection of the working condition includes a load frequency spectrum for lifting, a power-on duration, a power-on frequency and a full-load working actual time. And when the working condition of the crane exceeds the use range, recording and alarming.

The key safety components of the crane are those related to safety in use. In this step, the safety component abnormality detection includes, but is not limited to, a brake, a motor, a wire rope, a contactor, and the like. When the key safety component is abnormal in use, recording and alarming.

In this step, crane operation information statistics is also performed, and comprehensive information of crane operation can be recorded, including, but not limited to, total working time, total number of actions, total lifting distance, total walking distance, and the like.

And 5, communicating the MCU module with the external equipment, and transmitting the detection result to the external equipment.

In this embodiment, the peripheral equipment is MODBUS host computer and cell-phone, and the MCU module can carry out data interaction through RS485 communication isolation module and MODBUS host computer, and the MCU module carries out data interaction through bluetooth communication module and cell-phone. And the MCU module transmits data recorded in the fault detection of the safety switch and data recorded in the states of the working condition and the key safety parts of the crane to the MODBUS host or the mobile phone. The method specifically comprises the following steps:

the number of times of disconnection of the safety protection switch, the total number of times of switch faults and the type of the switch faults, data of the crane exceeding the use range under the working condition, data of the abnormal key safety components and crane operation information data are transmitted.

It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.

Claims

1. The utility model provides a device of control hoist safe operation which characterized in that: the system comprises an MCU monitoring circuit and MCU monitoring software, wherein the MCU monitoring circuit comprises an MCU module, a power supply module, a three-phase power sampling module, two isolation detection modules and an output switch isolation driving module; the power module and the three-phase electric sampling circuit are connected with a 380V alternating current power supply, the power module outputs direct current to supply power for other modules, the three-phase electric sampling module transmits sampling signals to the MCU module, the two isolation detection modules are respectively connected with the crane safety protection switch and the crane input request switch, the output switch isolation driving module is connected with the relay switch control circuit, the two isolation detection modules transmit switch state signals to the output switch isolation driving module on one hand, and transmit the switch state signals to the MCU module on the other hand, the MCU module determines the output switch state according to the crane switch state and controls the crane to work by controlling the circuit through the state of the isolation driving module to control the relay switch, and the MCU monitoring software is installed in the MCU module to realize the detection and control functions.

2. The device for monitoring the safe operation of the crane according to claim 1, wherein: the MCU module is also connected with two RS485 isolation communication modules and a Bluetooth communication module, one 485 communication isolation module is connected with an MODBUS host, and the MCU module is communicated with the MODBUS host through the 485 communication isolation module to realize a data interaction function; the other 485 communication isolation module is connected with a sensor or a sensor instrument, and the MCU module performs data interaction with the sensor or the sensor instrument through the 485 communication isolation module to detect the safety state of the crane; the MCU module is connected with the mobile phone through the Bluetooth communication module to realize a data interaction function with the mobile phone.

3. The device for monitoring the safe operation of the crane according to claim 1, wherein: a relay switch in the relay switch control circuit adopts a normally open relay switch, a relay control coil is provided with driving voltage by a 24V power supply, the relay switch is connected to a contactor control coil or a frequency converter input switch of the crane, and the contactor control coil or the frequency converter input switch is connected with a crane motor for controlling the crane to work; the power supply loop of the relay control coil is connected with a crane input request switch, a crane safety protection switch and a built-in electronic switch, the built-in electronic switch is realized by switching on and off of current at the output end of an optical coupling element, the input end of the optical coupling element is connected to a digital port of an MCU module, and the high and low level output by the MCU module controls the on and off of the optical coupling element to realize the control function of the relay switch; and arc extinguishing circuits formed by piezoresistors are also connected in the relay control coil loop and the load circuit.

4. A device for monitoring the safe operation of a crane according to any one of claims 1 to 3, characterized in that: the MCU monitoring software comprises:

5. The device for monitoring the safe operation of the crane according to claim 4, wherein: the configurable timer and the configurable fault action code are configured through an MODBUS host or a mobile phone; the data required by the crane working condition abnormal state detection software module, the data required by the crane safety component detection software module and the data required by the crane safety component detection software module are transmitted through a sensor or a sensor instrument connected with the RS485 isolation module.

6. A method for monitoring the safe operation of a crane is characterized in that: the method comprises the following steps:

step 3, the MCU module detects the fault of the safety switch;

7. A method of monitoring the safe operation of a crane as claimed in claim 6, wherein: the step 4 is followed by the following steps:

8. A method of monitoring the safe operation of a crane according to claim 6 or 7, characterized in that: the crane input request switch is an operating handle key switch, a remote controller output switch or a programmable switch, and the types of the input request switches comprise emergency stop, main starting, ascending, descending, ascending 1 speed, ascending 2 speed, left trolley traveling, right trolley traveling, acceleration of the trolley, forward traveling of a cart, backward traveling of the cart and acceleration of the cart; the crane safety protection switch comprises a main control switch, a lifting limit switch, a descending limit switch, a lifting overload switch, a lifting overheat switch, a left trolley limit switch, a right trolley limit switch, a front trolley limit switch and a rear trolley limit switch.

9. A method of monitoring the safe operation of a crane according to claim 6 or 7, characterized in that: the specific implementation method of the step 3 is as follows:

the method comprises the steps of reading switch signals of a crane input request switch and a crane safety protection switch, and acquiring the on or off state of the safety protection switch;

when the safety protection switch is disconnected, counting and recording the total times of the disconnection of the switch; and judging the fault of the safety protection switch according to the state of the output switch, counting and recording the total times of the switch fault if the fault is the fault, and recording the type of the switch fault which recently appears.

10. A method of monitoring the safe operation of a crane according to claim 6 or 7, characterized in that: the specific implementation method of the step 4 comprises the following steps: the MCU module carries out working condition abnormity detection, safety component abnormity detection and crane operation information statistics according to the state of the output switch;