CN114057107B - Rope breakage detection system and method for lifting opening and closing mechanism of grab ship unloader - Google Patents
Rope breakage detection system and method for lifting opening and closing mechanism of grab ship unloader Download PDFInfo
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- CN114057107B CN114057107B CN202111413658.1A CN202111413658A CN114057107B CN 114057107 B CN114057107 B CN 114057107B CN 202111413658 A CN202111413658 A CN 202111413658A CN 114057107 B CN114057107 B CN 114057107B
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- 238000001514 detection method Methods 0.000 title claims abstract description 135
- 230000007246 mechanism Effects 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 65
- 239000010959 steel Substances 0.000 claims abstract description 65
- 238000004804 winding Methods 0.000 claims abstract description 41
- 238000004891 communication Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 3
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- 238000007689 inspection Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/16—Applications of indicating, registering, or weighing devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/48—Automatic control of crane drives for producing a single or repeated working cycle; Programme control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
- B66C15/06—Arrangements or use of warning devices
- B66C15/065—Arrangements or use of warning devices electrical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
- B66C3/12—Grabs actuated by two or more ropes
- B66C3/125—Devices for control
Abstract
The invention provides a rope breakage detection system and method for a lifting opening and closing mechanism of a grab ship unloader, wherein the system comprises the following components: the steel wire rope state detection unit is arranged in the main trolley area of the grab ship unloader and is used for detecting the operation states of lifting, opening and closing the steel wire rope and the operation state of a main pulley on the trolley in real time; the winding drum running state detection unit is arranged at the end part of the lifting and opening-closing winding drum in the machine room and is used for detecting the running state of the steel wire rope winding drum; the main PLC control unit is arranged in the PLC room and is used for receiving the state data detected by the steel wire rope state detection unit and the winding drum running state detection unit and giving out a rope breakage fault alarm based on the state data; the steel wire rope state detection unit and the winding drum running state detection unit are respectively connected with the main PLC control unit through buses.
Description
Technical Field
The invention relates to the field of bulk cargo wharf grab ship unloader equipment, in particular to a rope breakage detection system and method for a lifting opening and closing mechanism of a grab ship unloader.
Background
The hoisting and opening and closing mechanisms of the grab ship unloader are the most important two running mechanisms, the loss of the steel wire rope is the most serious, and the average service life of the hoisting and opening and closing steel wire rope of the grab ship unloader of 2000t/h is about 300 ten thousand tons of materials. Once the rope breakage accident happens, the equipment is stopped, and risks such as out-of-control collision of the grab bucket can be generated. At present, the detection of the broken rope of the lifting and opening steel wire rope is generally carried out by adopting a manual inspection mode, and the efficiency is low. Therefore, a reliable online rope breakage detection system for the lifting opening and closing mechanism of the grab ship unloader is urgently needed to ensure the safety and reliability of the operation of the grab ship unloader.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a rope breakage detection system and method for a lifting and opening-closing mechanism of a grab ship unloader, which detect the running states of lifting and opening-closing steel wire ropes in a mode of configuring an ultrasonic sensor, an RFID detection device and an encoder, and once a rope breakage fault occurs, the detection system sends out a fault alarm signal so as to realize the functions of rope breakage detection of the lifting and opening-closing mechanism of the grab ship unloader.
The invention adopts the following technical means:
a rope breakage detection system of a lifting opening and closing mechanism of a grab ship unloader comprises:
the steel wire rope state detection unit is arranged in the main trolley area of the grab ship unloader and is used for detecting whether the lifting and opening steel wire rope runs in the pulley groove or not and the running rotating speed of a main pulley on the trolley in real time;
the winding drum running state detection unit is arranged at the end part of the lifting and opening-closing winding drum in the machine room and is used for detecting the running rotating speed of the steel wire rope winding drum;
the main PLC control unit is arranged in the PLC room and is used for receiving the state data detected by the steel wire rope state detection unit and the winding drum running state detection unit and giving out a rope breakage fault alarm based on the state data;
the steel wire rope state detection unit and the winding drum running state detection unit are respectively connected with the main PLC control unit through buses.
Further, the steel wire rope state detection unit comprises an ultrasonic sensor, an RFID detection device, a coding disc, a communication module, a DI module, a wireless transmission device and a storage battery;
the ultrasonic sensor is arranged at a main pulley rope groove on the main trolley frame and used for detecting whether the lifting and opening-closing steel wire rope runs in the pulley rope groove or not;
the RFID detection device is arranged on the side wall of the main pulley on the main trolley frame, the coding disc of the RFID detection device is arranged around the side wall of the main pulley, and the RFID detection device is used for measuring the rotating speed of the main pulley by reading the data of the coding disc during the rotation process of the main pulley;
the communication module is arranged in an electric cabinet on the main trolley frame and is used for receiving the measured data of the RFID detection device;
the DI module is arranged in an electric cabinet on the main trolley frame and is used for receiving the data of the ultrasonic sensor;
the wireless transmission device is arranged in an electric cabinet on the main trolley frame and is used for realizing data communication with the main PLC control unit;
the storage battery is arranged in an electric cabinet on the main trolley frame and is used for supplying power to the electric elements.
Further, the drum running state detection unit comprises four groups of absolute value encoders and mounting brackets thereof, wherein the four groups of absolute value encoders are respectively a hoisting sea side drum absolute value encoder, a hoisting land side drum absolute value encoder, an opening and closing sea side drum absolute value encoder and an opening and closing land side drum absolute value encoder.
Further, the main PLC control unit comprises a PLC module, a communication module and a wireless receiving device.
The rope breakage detection method for the lifting and opening-closing mechanism of the grab ship unloader is realized based on the rope breakage detection system for the lifting and opening-closing mechanism of the grab ship unloader, and comprises the following steps:
s1, controlling the rope breakage detection system of the lifting opening and closing mechanism and the grab ship unloader to synchronously operate;
s2, the main PLC control unit receives and performs operation analysis on detection data of the steel wire rope breakage detection unit and the winding drum running state detection unit respectively, and the method comprises the following steps:
the main PLC control unit detects four groups of ultrasonic sensor signals in the wire rope breakage detection unit in real time, when any group of ultrasonic sensor signals change, the wire rope is pulled out after being judged to be broken, a rope breakage fault alarm is immediately sent out, and the operation of a corresponding main mechanism is timely interrupted;
the main PLC control unit receives real-time data of four groups of RFID detection devices in the steel wire rope state detection unit and four groups of absolute value encoders in the winding drum running state detection unit simultaneously, converts and compares the data of the four groups of RFID detection devices and the data of the four groups of absolute value encoders, and once the ratio of the running speed of the main pulley fed back by the RFID to the running speed of the winding drum fed back by the absolute value encoder is lower than a set threshold value, the phenomenon that the steel wire rope breaks is judged, a rope breaking fault alarm is immediately sent out, and the running of a corresponding main mechanism is timely interrupted.
Further, once the ratio of the running speed of the main pulley fed back by the RFID to the running speed of the winding drum fed back by the absolute value encoder is lower than a set threshold, the phenomenon of rope breakage of the steel wire rope is judged, a rope breakage fault alarm is immediately sent out, and the operation of a corresponding main mechanism is timely interrupted, and the method comprises the following steps:
judging that the steel wire rope is in a normal state according to the following formula:
K 0 <(R 01 *Ω 01 )/(R 00 *Ω 00 )<100％；
judging that the steel wire rope is in a rope breaking state according to the following formula:
(R 01 *Ω 01 )/(R 00 *Ω 00 )<＝K 0 ；
wherein R is 01 Is the radius omega of the main pulley on the trolley 01 The running angular speed of the main pulley fed back by the RFID detection device, R 00 Is the radius omega of the steel wire rope reel in the machine room 00 For the angular velocity, K, of the drum run detected by the absolute value encoder 0 When the calculated ratio is smaller than the rope breakage fault warning threshold value, the main pulley is judged to be unable to rotate along with the winding drum due to the rope breakage fault, and a rope breakage fault warning signal is sent.
Compared with the prior art, the invention has the following advantages:
1. the invention is applied to bulk cargo wharf grab ship unloader equipment, and detects the running states of the lifting and opening and closing steel wire ropes in a mode of configuring an ultrasonic sensor, an RFID detection device and an encoder, and once the rope breakage fault occurs, the detection system sends out a fault alarm signal, so that the functions of lifting the grab ship unloader and detecting the rope breakage of an opening and closing mechanism are realized.
2. According to the invention, an automatic detection mode is adopted to replace manual inspection, so that the detection efficiency is improved, the detection function is stable and reliable, and the safety and the practicability of the equipment are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of a rope breakage detecting system of a lifting opening and closing mechanism.
Fig. 2 is a circuit connection diagram of the wire rope breakage detection unit of the present invention.
FIG. 3 is a circuit diagram of a spool operation state detection unit according to the present invention.
Fig. 4 is a circuit connection diagram of a main PLC control unit according to the present invention.
Fig. 5 is a layout diagram of a detecting device of a rope breakage detecting system of a lifting opening and closing mechanism.
Fig. 6 is a control flow chart of the rope breakage detection device of the lifting opening and closing mechanism.
Reference numerals: 1. a wire rope breakage detection unit; 101. an ultrasonic sensor; 102. RFID detection device and coded disc; 103. a communication module; 104. a DI module; 105. a wireless transmission device; 106. a storage battery; 2. a main PLC control unit; 201. a PLC; 202. a DP communication module; 203. a wireless receiving device; 3. a spool running state detection unit; 301. an absolute value encoder of a hoisting sea side reel; 302. an absolute value encoder of a hoisting land side reel, 303, an absolute value encoder of an open-close sea side reel; 304. an absolute value encoder for opening and closing the land side reel; a01, opening and closing the steel wire rope 1; a02, lifting a steel wire rope 1; a03, opening and closing a pulley; a04, lifting pulleys; a05, an ultrasonic sensor; a06, a main trolley; a07, opening and closing a steel wire rope 2; a08, lifting the steel wire rope 2; a09, electric cabinet; a10, an RFID detection device and an encoder; a11, opening and closing a winding drum in a machine room; a12, lifting a winding drum of the machine room; a13, an absolute value encoder; a14, grab bucket.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the invention provides a rope breakage detection system for a lifting opening and closing mechanism of a grab ship unloader, which consists of a steel wire rope state detection unit, a winding drum running state detection unit and a main PLC control unit. The steel wire rope state detection unit is arranged in the grab ship unloader main trolley area and is used for detecting the operation state of the lifting and opening and closing steel wire rope and the operation state of the main pulley on the trolley in real time, namely detecting the operation of the lifting and opening and closing steel wire rope in the pulley groove in real time and detecting the operation rotating speed of the main pulley. The drum running state detection unit is arranged at the end part of the lifting and opening/closing drum in the machine room and is used for detecting the running state of the steel wire rope drum, namely detecting the running rotating speed of the drum. The main PLC control unit is arranged in the PLC room and used for collecting data and carrying out algorithm analysis and timely giving out rope breakage fault warning. The steel wire rope state detection unit consists of an ultrasonic sensor, an RFID detection device, a coding disc, a communication module, a DI module, a wireless transmission device and a storage battery. The drum running state detection unit consists of four groups of absolute value encoders and mounting brackets thereof. The main PLC control unit consists of a PLC module, a communication module and a wireless receiving device. The steel wire rope state detection unit, the winding drum running state detection unit and the main PLC control unit are connected through a Profibus DP bus.
The invention also provides a rope breakage detection method of the grab ship unloader lifting switching mechanism based on the rope breakage detection system of the lifting switching mechanism, which comprises the following steps:
s1, when an operator operates the grab ship unloader at a cab linkage table, a rope breakage detection function of a lifting opening and closing mechanism is automatically activated.
S2, after receiving a rope breakage detection function activation instruction of the lifting opening and closing mechanism, the main PLC control unit sequentially receives, calculates and analyzes detection data of the steel wire rope breakage detection unit and the winding drum running state detection unit. The method specifically comprises the following steps:
s201, the main PLC control unit detects four groups of ultrasonic sensor signals in the wire rope breakage detection unit in real time, and once the signals change, the signals are extracted after the wire rope breakage is judged, and the wire rope breakage fault alarm is immediately sent out to timely interrupt the operation of the corresponding main mechanism.
S202, the main PLC control unit receives real-time data of four groups of RFID detection devices in the steel wire rope state detection unit and four groups of absolute value encoders in the winding drum running state detection unit, converts and compares the data of the four groups of RFID detection devices and the data of the four groups of absolute value encoders, and once the ratio of the running speed of the main pulley fed back by the RFID to the running speed of the winding drum fed back by the absolute value encoder is lower than a set threshold value, the phenomenon that the steel wire rope breaks is judged, a rope breaking fault alarm is immediately sent out, and the running of a corresponding main mechanism is timely interrupted. The specific judgment formula is as follows:
judging formula of normal state of the steel wire rope: k0< (r01×Ω 01)/(r00×Ω 00) <100%;
judging formula of the wire rope breakage state: (R01 x Ω 01)/(R00 x Ω 00) < K0;
wherein R01 is the radius of the main pulley on the trolley, omega 01 is the running angular velocity of the main pulley fed back by the RFID detection device, R00 is the radius of the steel wire rope reel in the machine room, omega 00 is the running angular velocity of the reel detected by the absolute value encoder, K0 is the warning threshold value of the rope breakage fault, and when the calculated ratio is smaller than the warning threshold value of the rope breakage fault, the main pulley is judged to be unable to rotate along with the reel due to the rope breakage fault, and a warning signal of the rope breakage fault is sent.
And S3, detecting the grab ship unloader in real time by adopting the detection mode in S2 until the ship unloader is operated, so as to realize the rope breakage detection function of the lifting opening and closing mechanism and ensure the safe and stable operation of the equipment.
The following further describes the scheme and effects of the present invention through specific application examples.
The rope breakage detection system of the lifting opening and closing mechanism of the grab ship unloader is shown in fig. 1, and consists of a steel wire rope breakage detection unit 1, a main PLC control unit 2 and a winding drum running state detection unit 3.
The wire rope breakage detection unit 1 is composed of an ultrasonic sensor 101, an RFID detection device, a coding disc 102, a communication module 103, a DI module 104, a wireless transmission device 105 and a storage battery 106 which are arranged on a main trolley. The ultrasonic sensor data 101 is accessed to the DI module 104, the RFID detection device 102 is accessed to the communication module 103, and after the detection data in the units are summarized, the detection data are transmitted to the main PLC control unit 2 by adopting a Profibus DP bus protocol through wireless transmission, and the specific connection mode is shown in fig. 2.
The drum running state detection unit 3 is composed of four groups of absolute value encoder devices which are arranged in a machine room and used for lifting, opening and closing the end parts of the drum, and data of the four groups of absolute value encoder devices are transmitted to the main PLC control unit 2 through Profibus DP bus cables by adopting a Profibus DP bus protocol, and the specific connection mode is shown in figure 3.
The main PLC control unit 2 is composed of a PLC201 installed in a PLC room, a DP communication module 202, and a wireless receiving device 203. The PLC201 is used for controlling the rope breakage detection function of the lifting switching mechanism, and the DP communication module 202 and the wireless receiving device 203 are used for communicating Profibus DP protocol data of the PLC with the wire rope breakage detection unit U1 and the drum running state detection unit U2, and the specific wiring mode is shown in fig. 4.
After the rope breakage detection function of the lifting opening and closing mechanism is activated, the main PLC control unit 2 sequentially receives, calculates and analyzes detection data of the steel wire rope breakage detection unit 1 and the winding drum running state detection unit 3. When the signal of the ultrasonic sensor changes and the main pulley runs abnormally relative to the winding drum, the main PLC control unit gives out a rope breakage fault alarm, and timely interrupts the action of the main mechanism, so that the occurrence of the out-of-control collision accident of the grab bucket is avoided.
The technology can realize the rope breakage detection function of the lifting opening and closing mechanism of the grab ship unloader, timely send out rope breakage fault warning, and ensure safe and stable operation of equipment. The intelligent level of the equipment is improved, and the labor intensity of operators and wharf operation maintenance personnel is reduced to a certain extent.
As shown in fig. 5, which is a schematic diagram of the arrangement position of the device, it can be seen that an ultrasonic sensor is installed near the main pulley rope groove on the main trolley frame, and is used for detecting whether the lifting and opening/closing steel wire rope runs in the pulley rope groove. The RFID detection device is arranged near the side wall of the main pulley on the main trolley frame, the coding disc of the RFID detection device is arranged around the side wall of the main pulley in a circle, and the RFID detection device is used for measuring the rotating speed of the main pulley by reading the data of the coding disc in the rotating process of the main pulley. In addition, the communication module is arranged in an electric cabinet on the main trolley frame and is used for receiving the data of the RFID detection device. The DI module is arranged in an electric cabinet on the main trolley frame and is used for receiving the data of the ultrasonic sensor. The wireless transmission device is arranged in an electric cabinet on the main trolley frame and used for realizing data communication with the main PLC control unit. The storage battery is arranged in an electric cabinet on the main trolley frame and is used for supplying power to the electric elements.
Taking a double-front rope-discharging grab ship unloader as an example, the rope breakage detection function of the lifting opening and closing mechanism is described. The control flow is as shown in fig. 6: after the rope breakage detection function of the lifting opening and closing mechanism of the grab ship unloader is activated, the main PLC control unit detects four groups of ultrasonic sensor signals in the steel wire rope breakage detection unit in real time, if the signals change, the steel wire rope is judged to be pulled out after being broken, a rope breakage fault alarm is immediately sent out, the operation of the corresponding main mechanism is timely interrupted, and the occurrence of out-of-control collision accidents of the grab ship is avoided. If the ultrasonic sensor signal is normal, the main PLC control unit further detects data of four groups of RFID detection devices in the steel wire rope state detection unit and four groups of absolute value encoders in the winding drum running state detection unit in real time, converts and compares the data of the four groups of RFID detection devices and the data of the four groups of absolute value encoders, and analyzes the data, and once the ratio of the running speed of the main pulley fed back by the RFID to the running speed of the winding drum fed back by the absolute value encoder is lower than a set threshold value, the phenomenon that the steel wire rope breaks is judged, a rope breaking fault alarm is immediately sent, and the corresponding main mechanism is timely interrupted. If the detection results are all abnormal, the main PLC control unit repeatedly performs the detection until the ship unloading operation of the grab ship unloader is completed.
The system and the method for detecting the broken rope of the lifting and opening mechanism of the grab ship unloader can realize the rapid detection of the broken rope fault of the lifting and opening steel wire rope, greatly enhance the operation safety of the grab ship unloader, and simultaneously save a large amount of cost for manual inspection for a wharf.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (4)
1. The utility model provides a grab ship unloader plays to rise closing mechanism and breaks rope detecting system which characterized in that includes:
the system comprises a steel wire rope state detection unit arranged in a main trolley area of the grab ship unloader, wherein the steel wire rope state detection unit is used for detecting whether a lifting steel wire rope and an opening steel wire rope run in a pulley groove or not in real time and measuring the running rotating speed of a main pulley on the trolley, the steel wire rope state detection unit comprises an ultrasonic sensor, an RFID detection device, a coding disc, a communication module, a DI (digital information) module, a wireless transmission device and a storage battery, the ultrasonic sensor is arranged at the position of the pulley groove on a main trolley frame and used for detecting whether the lifting steel wire rope and the opening steel wire rope run in the pulley groove or not, the RFID detection device is arranged on the side wall of the main pulley on the main trolley frame, the coding disc is arranged around the pulley groove in a circle, the RFID detection device is used for reading the data of the coding disc and measuring the running rotating speed of the main pulley in a process of the main pulley, the communication module is arranged in an electric control box on the main trolley frame and used for receiving the measured data of the RFID detection device, the DI module is arranged in the electric control box on the main trolley frame and used for receiving the data of the ultrasonic sensor, the wireless transmission device is arranged on the main trolley frame and the electric control box and the communication module and the radio control device and the storage battery, and the wireless transmission device is arranged in the electric control unit and the electric control device and the radio control device is used for transmitting the data and the RFID device and the control device and the radio control device is arranged in the electric control device and the control device;
the device comprises a winding drum running state detection unit which is arranged at the end part of a lifting and opening and closing winding drum in a machine room and is used for detecting the running rotating speed of a steel wire rope winding drum, and the winding drum running state detection unit comprises four groups of absolute value encoders and a mounting bracket thereof, wherein the four groups of absolute value encoders are respectively a lifting sea side winding drum absolute value encoder, a lifting land side winding drum absolute value encoder, an opening and closing sea side winding drum absolute value encoder and an opening and closing land side winding drum absolute value encoder;
the main PLC control unit is arranged in the PLC room and is used for receiving the state data detected by the steel wire rope state detection unit and the winding drum running state detection unit and giving out a rope breakage fault alarm based on the state data;
the steel wire rope state detection unit and the winding drum running state detection unit are respectively connected with the main PLC control unit through buses.
2. The rope breakage detection system for the lifting and opening-closing mechanism of the grab ship unloader according to claim 1, wherein the main PLC control unit comprises a PLC module, a communication module and a wireless receiving device.
3. A method for detecting rope breakage of a lifting and opening mechanism of a grab ship unloader, which is characterized by being realized based on the rope breakage detection system of the lifting and opening mechanism of the grab ship unloader according to any one of claims 1-2, and comprising the following steps:
s1, controlling the rope breakage detection system of the lifting opening and closing mechanism and the grab ship unloader to synchronously operate;
s2, the main PLC control unit receives and performs operation analysis on detection data of the steel wire rope breakage detection unit and the winding drum running state detection unit respectively, and the method comprises the following steps:
the main PLC control unit detects four groups of ultrasonic sensor signals in the wire rope breakage detection unit in real time, when any group of ultrasonic sensor signals change, the wire rope is pulled out after being judged to be broken, a rope breakage fault alarm is immediately sent out, and the operation of a corresponding main mechanism is timely interrupted;
the main PLC control unit receives real-time data of four groups of RFID detection devices in the steel wire rope state detection unit and four groups of absolute value encoders in the winding drum running state detection unit simultaneously, converts and compares the data of the four groups of RFID detection devices and the data of the four groups of absolute value encoders, and once the ratio of the running speed of the main pulley fed back by the RFID to the running speed of the winding drum fed back by the absolute value encoder is lower than a set threshold value, the phenomenon that the steel wire rope breaks is judged, a rope breaking fault alarm is immediately sent out, and the running of a corresponding main mechanism is timely interrupted.
4. The method for detecting rope breakage of a hoisting and opening-closing mechanism of a grab ship unloader according to claim 3, wherein upon finding that the ratio of the running speed of a main pulley fed back by an RFID to the running speed of a reel fed back by an absolute encoder is lower than a set threshold, determining that a rope breakage phenomenon occurs in a steel wire rope, immediately giving a rope breakage fault alarm, and timely interrupting the operation of the corresponding main mechanism, the method comprises the steps of:
judging that the steel wire rope is in a normal state according to the following formula:
K 0 <（R 01 *Ω 01 ）/( R 00 *Ω 00 )<100%；
judging that the steel wire rope is in a rope breaking state according to the following formula:
（R 01 *Ω 01 ）/( R 00 *Ω 00 ) <=K 0 ；
wherein R is 01 Is the radius omega of the main pulley on the trolley 01 The running angular speed of the main pulley fed back by the RFID detection device, R 00 Is the radius omega of the steel wire rope reel in the machine room 00 For the angular velocity, K, of the drum run detected by the absolute value encoder 0 When the calculated ratio is smaller than the rope breakage fault warning threshold value, the main pulley is judged to be unable to rotate along with the winding drum due to the rope breakage fault, and a rope breakage fault warning signal is sent.
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| CN202111413658.1A CN114057107B (en) | 2021-11-25 | 2021-11-25 | Rope breakage detection system and method for lifting opening and closing mechanism of grab ship unloader |
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| CN202111413658.1A CN114057107B (en) | 2021-11-25 | 2021-11-25 | Rope breakage detection system and method for lifting opening and closing mechanism of grab ship unloader |
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| CN214668769U (en) * | 2021-04-22 | 2021-11-09 | 洛阳威尔若普检测技术有限公司 | Port hoisting equipment wire rope detection device |
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| CN104909273A (en) * | 2015-06-12 | 2015-09-16 | 华电重工股份有限公司 | Grab ship unloader as well as driving method and device of grab ship unloader |
| CN104909275A (en) * | 2015-06-12 | 2015-09-16 | 华电重工股份有限公司 | Method and system for intelligently reducing speed of grab bucket/carrier loader and lifting-switching mechanism |
| JP2018083713A (en) * | 2016-11-25 | 2018-05-31 | 株式会社タダノ | Irregular winding preventing device for winch and crane |
| CN111533019A (en) * | 2020-05-09 | 2020-08-14 | 福建恒安集团有限公司 | Electric control winch control system and control method thereof |
| CN111675106A (en) * | 2020-07-31 | 2020-09-18 | 山东省科学院海洋仪器仪表研究所 | Intelligent grab bucket system based on Internet of things and monitoring method |
| CN214668769U (en) * | 2021-04-22 | 2021-11-09 | 洛阳威尔若普检测技术有限公司 | Port hoisting equipment wire rope detection device |
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