Online continuous detection device and detection method for special belt of tower crane

Abstract

The invention relates to the technical field of oil extraction machinery, and discloses a tower crane special belt online continuous detection device and method, the device comprises a belt, a single-chip microcomputer and a detector, the upper surface of the detector is fixedly connected with a support, the belt is internally provided with a supporting wheel, the detector is arranged above the supporting wheel, and the single-chip microcomputer is fixedly connected with the support. The outer side of the belt is provided with a group of corresponding belt track lines and head and tail end markers, a first infrared light-emitting tube and a first infrared receiving tube as well as a second infrared light-emitting tube and a second infrared receiving tube which are matched with each other are respectively arranged below the detector, and the first infrared light-emitting tube and the first infrared receiving tube are in a paired transceiving relationship; and corresponding points of the two detection light spots are respectively a belt track line and head and tail end markers on the belt. The double infrared sensor sets are used for monitoring the conditions of belt deviation and tensile deformation, belt damage or local damage fracture, abnormal stretching and the like, accidents such as belt fracture and the like are prevented, and the monitoring reliability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production machinery, and specifically to an on-line continuous detection device and detection method for a special belt of a derrick machine. Background Art

[0002] Due to its advantages such as long stroke, low stroke frequency, and energy saving, the derrick pumping unit has been widely used in the industry. The motor of the derrick pumping unit drives the reduction gearbox and the drum through forward and reverse rotation control to transmit energy to the steel cable belt group, driving the sucker rod to move up and down in a straight line. The steel cable belt group has multiple steel cables inside and a rubber layer outside. When subjected to repeated running impacts for a long time or large instantaneous impacts of the pumping unit load, the steel wire material is easily damaged and broken wires are generated, but it is impossible to judge from the appearance of the steel wire belt group, so there are major safety hazards. Once too many local steel wires break, it may cause more steel wires to undergo chain fatigue fractures, directly causing the overall fracture of the steel wire belt group under the pressure of large loads. Eventually, the counterweight load of the derrick machine may fall, leading to major production accidents. In the industry, a new type of belt using high-strength fiber fabric to replace the steel cable has emerged. Although its load-bearing capacity is not inferior to that of the steel cable belt group, continuous operation for a long time and load changes may also cause the belt to have a risk of fracture. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides an on-line continuous detection device and detection method for a special belt of a derrick machine, solving the problem that it is necessary to establish an on-line operation monitoring system for the belt operation condition of the derrick machine to timely discover potential risks and avoid operation accidents.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: An on-line continuous detection device for a special belt of a derrick machine includes a belt, a single-chip microcomputer, and a detector. A bracket is fixedly connected to the upper surface of the detector. A support wheel is arranged inside the belt. The detector is arranged above the support wheel. There is a corresponding set of belt track lines and first and last end markers on the outside of the belt. Below the detector, there are a supporting first infrared light-emitting diode and a first infrared light-receiving diode, and a second infrared light-emitting diode and a second infrared light-receiving diode respectively. The first infrared light-emitting diode and the first infrared light-receiving diode are in a paired transceiver relationship. The second infrared light-emitting diode and the second infrared light-receiving diode are in a paired transceiver relationship. The corresponding points of the detection light spots of the two are the belt track lines and the first and last end markers on the belt respectively.

[0005] Preferably, the detector belongs to an infrared serial communication circuit external to the single-chip microcomputer and is composed of two groups of infrared emission circuits, an infrared signal receiving circuit, and a signal output circuit. Each group of infrared emission circuits can convert binary pulse modulation signals into optical pulse signals, project them onto the belt track line and the head and tail markers, generate optical reflection pulse signals that are received by the infrared signal receiving circuit, and after being filtered and amplified by the signal output circuit, are output to the single-chip microcomputer for demodulation to restore digital signals, thereby realizing the basic detection of the position of the belt.

[0006] Preferably, one side of the outer wall of the bracket is fixedly connected with a control box, and the single-chip microcomputer is fixedly connected inside the control box to analyze and process the monitoring data returned by the detector. The single-chip microcomputer is composed of an input circuit, a CPU, a memory, a timer, a comparison circuit, an output circuit, a display terminal, a remote terminal, a device control terminal, other auxiliary circuits, and a software system.

[0007] A detection method for an on-line continuous detection device for a special belt of a tower crane includes the following steps: Step 1: Convert the belt travel parameters according to the stroke and stroke frequency set by the tower crane. Step 2: Monitor the operating state of the belt. When it is detected that the belt is offset, the system will give a chain alarm. Step 3: Detect the further self-state of the belt. When the belt shows stretching and deformation, the system will give a chain alarm. Step 4: The single-chip microcomputer has a log recording function, and the operating parameters for a period of time will be recorded for query. The software system presets monitoring countermeasures. For example, only record occasional data. If the same alarm message appears continuously twice in a short time, the system starts alarm remote transmission; if it appears continuously five times, the system automatically controls the tower crane to stop and apply emergency braking.

[0008] Preferably, in Step 1, the first infrared light-emitting diode emits continuous pulse signals and directly projects them onto the belt track line. When the belt runs normally, the first infrared receiving tube receives the reflected signal, outputs a high-level pulse signal to the input circuit, compares it with the pulse signal of the first infrared light-emitting diode through the comparison circuit to confirm signal synchronization, and then feeds back the information to the CPU for confirmation and recording. The output circuit displays that the system is running normally.

[0009] Preferably, in Step 2, the belt track line on the surface of the belt is scanned and tracked by the first infrared light-emitting diode or the first infrared receiving tube. If the belt track line always maintains a stable high-level state, the belt runs stably. If the output level of the receiving tube decreases, it means that the belt track line is not centered with the first infrared light-emitting diode or the first infrared receiving tube, and it can be determined that the belt is offset, and the system will give a chain alarm.

[0010] Preferably, in the second step, the single-chip microcomputer processing process further includes that when the belt 1 is offset due to abnormal movement, the belt trajectory line is misaligned with the first infrared light-emitting diode and the first infrared receiving diode, the reflected signal decays, the first infrared receiving diode outputs a low-level pulse signal to the input circuit, the signal is confirmed to be abnormal by comparing with the pulse signal of the first infrared light-emitting diode through the comparison circuit, the information is fed back to the CPU to confirm the abnormal position of the belt, and the output circuit gives an alarm prompt and log record to the display terminal or transmits it remotely to the remote terminal. If the low-level signal continues to appear, the CPU presets a signal delay. If the signal is not released within the specified time, the output circuit stops the tower crane through the equipment control instruction.

[0011] Preferably, in the third step, the second infrared light-emitting diode or the second infrared receiving diode scans and timestamps the head and tail markers on the surface of the belt. If the timestamp of the detected head and tail signals matches the preset parameters, the belt itself is in normal condition. If the time difference parameter between the two is extended, it indicates that the belt has stretched and deformed, and the system will give a chain alarm.

[0012] Preferably, in the third step, the second infrared light-emitting diode emits continuous pulse signals directly projected onto the two head and tail markers on the belt. When the belt is running normally, the second infrared light-emitting diode receives a weak reflected signal from the belt and outputs a low-level pulse signal to the superimposed timer for cumulative timing, and then outputs it to the CPU for confirmation and recording. When the belt is at the starting end of the operation, the head and tail markers trigger the second infrared light-emitting diode to output a high-level pulse signal, and the superimposed timer resets the timing count and outputs it to the CPU for confirmation and recording.

[0013] Preferably, in the fourth step, when the belt starts to run, the second infrared light-emitting diode starts to output a low-level pulse signal to the CPU and continues to time until the belt runs to the end. The CPU confirms, continuously records, and repeatedly compares the cumulative data of the timer, calculates the belt running cycle duration according to the preset stroke and stroke parameters of the tower crane, and repeatedly verifies the data. If the verified running time exceeds the limit, it may be that the steel cable or fiber fabric of the belt is broken or the load is abnormal, etc. The output circuit gives an alarm prompt and log record to the display terminal or transmits it remotely to the remote terminal. In serious cases, the tower crane can be stopped through the equipment control instruction.

[0014] The present invention provides an on-line continuous detection device and detection method for a special belt of a tower crane. It has the following beneficial effects: 1. The present invention monitors the changes of the belt at the top of the tower crane through a dynamic optical recognition method of belt operation, which is highly operable and easy to implement. By monitoring the belt offset and stretching deformation through a dual-infrared sensor group, it can detect the occurrence of abnormal belt jitter, belt damage or local damage and fracture, and abnormal stretching, etc., prevent the occurrence of accidents such as belt fracture, and has high monitoring reliability.

[0015] 2. When the steel cables and fiber fabrics inside the belt are partially or completely broken during the operation of the belt in the present invention, the belt will be stretched and elongated at the initial stage, that is, the operation cycle of the belt at the head and tail ends becomes longer. The abnormality of the belt can be confirmed by repeatedly timing and verifying the belt length, so as to stop the machine in time to avoid the accident of the complete breakage of the belt.

[0016] 3. The accident warning response measures of the present invention can be automatically carried out. An on-line continuous monitoring device and monitoring method for the belt of a tower crane can be centrally used as a part of the automatic control management of the control system of the tower crane to improve the reliability of the transmission system of the tower crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the installation structure at the top of the tower crane of the present invention; Figure 2 is a state diagram of the installation of the detector and the belt of the present invention; Figure 3 is a schematic diagram of the principle of the single-chip microcomputer part of the present invention.

[0018] Among them, 1. Belt; 2. Detector; 3. Bracket; 4. Support wheel; 5. First infrared light-emitting diode; 6. First infrared receiving diode; 7. Second infrared light-emitting diode; 8. Second infrared receiving diode; 9. Belt track line; 10. Head and tail end markers. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0020] Please refer to the attached Figure 1 - attached Figure 2 , the embodiment of the present invention provides an on-line continuous detection device for the special belt of a tower crane, including a belt 1, a single-chip microcomputer and a detector 2. A bracket 3 is fixedly connected to the upper surface of the detector 2. A support wheel 4 is arranged inside the belt 1. The detector 2 is arranged above the support wheel 4. There is a corresponding set of belt track lines 9 and head and tail end markers 10 outside the belt 1. Below the detector 2, there are a supporting first infrared light-emitting diode 5 and first infrared receiving diode 6, and a second infrared light-emitting diode 7 and second infrared receiving diode 8 respectively. The first infrared light-emitting diode 5 and the first infrared receiving diode 6 are in a paired transceiver relationship, and the second infrared light-emitting diode 7 and the second infrared receiving diode 8 are in a paired transceiver relationship. The corresponding points of the detection light spots of the two are the belt track lines 9 and the head and tail end markers 10 on the belt respectively.

[0021] Furthermore, a rubber film strip of a color different from that of the belt 1 is pasted at any position on the outer side of the belt of the tower crane with an adhesive as the belt track marking line 9. The width of the rubber film strip is 1-5 mm, and the thickness is <1 mm. Circular or horizontal line markers 10 are pasted at the corresponding positions at the head and end of the travel of the belt 1. The markers are composed of rubber film strips of the same material as the belt track marking line 9, and the width of the rubber film strip is 1-5 mm, and the thickness is <1 mm. The positions of the markers and the belt track line are not on the same continuous points, and the two respectively correspond to two groups of infrared emission and reception tubes.

[0022] Specifically, the track marking line 9 and the head and end markers 10 can be pasted on the belt 1 after it is installed on the tower crane, or the track marking line 9 and the head and end markers 10 can be pre-pasted before installation. The rubber film strip is a regular rubber strip with a high contrast in color with the belt 1 body, and its material composition is the same as that of the belt 1 body. The adhesive is a rubber adhesive that meets the bonding requirements of the belt 1 body material. The related materials belong to the application of mature technologies and do not need to be described separately.

[0023] In one embodiment, the first infrared light-emitting tube 5 and the first infrared receiving tube 6, and the second infrared light-emitting tube 7 and the second infrared receiving tube 8 form two groups of infrared detection systems. These infrared transceiver pairs are placed on both sides of the belt 1. By emitting infrared light and monitoring whether it is blocked or reflected by specific marks on the belt such as the belt track line 9 and the head and end markers 10, the position and movement state of the belt are judged. The belt track line 9 and the head and end markers 10: As specific marks on the belt 1, they can be monitored by the detector 2, so as to provide information about the position and movement of the belt 1. The single-chip microcomputer: The detector 2 transmits the collected information to the single-chip microcomputer, and the single-chip microcomputer processes this information to judge whether the state of the belt 1 is normal, whether there is deviation, wear or other potential faults. The supporting wheel 4 is used to maintain the tension and stability of the belt, and ensure the smooth movement of the belt 1 during the detection process.

[0024] The detector 2 belongs to an external infrared serial communication circuit of the single-chip microcomputer and is composed of two groups of infrared emission circuits, an infrared signal receiving circuit, and a signal output circuit. Each group of infrared emission circuits can convert a binary pulse modulation signal into an optical pulse signal, project it onto the belt track line 9 and the head and end markers 10, generate an optical reflection pulse signal that is received by the infrared signal receiving circuit, and after being filtered and amplified by the signal output circuit, it is output to the single-chip microcomputer for demodulation to restore the digital signal, so as to realize the basic detection of the position of the belt 1.

[0025] In one embodiment, the infrared emission circuit in the detector 2 is responsible for converting the binary pulse modulation signal sent by the single-chip microcomputer into an optical pulse signal. These optical pulse signals are then projected onto the belt track line 9 and the head and tail markers 10 on the belt 1. When the optical pulse signal is projected onto the markers on the belt 1, the optical pulse will be reflected back to form an optical reflection pulse signal. These reflected signals are captured by the infrared signal receiving circuit. The received optical reflection pulse signal undergoes filtering and amplification processing by the signal output circuit to remove noise and enhance the readability of the signal. The processed signal is then sent back to the single-chip microcomputer, which demodulates these signals and restores them to digital signals to determine the position and motion state of the belt.

[0026] Specifically, through the reflection of infrared rays, the device can accurately detect the positions of the belt track line 9 and the head and tail markers 10, thereby accurately monitoring the position of the belt 1. Infrared communication has high sensitivity and can quickly respond to position changes during the operation of the belt, promptly detecting deviations and abnormal conditions. The infrared system is relatively less susceptible to external electromagnetic interference, providing stable and reliable detection performance. Due to the high-speed nature of infrared communication, the detector 2 can feedback the belt status to the single-chip microcomputer in real time, making immediate adjustment and decision-making possible. Through continuous monitoring, the system can not only detect the position of the belt in real time but also predict the wear condition of the belt and give early warnings of possible faults.

[0027] On one side of the outer wall of the bracket 3, a control box is fixedly connected. The single-chip microcomputer is fixedly connected inside the control box and is used to analyze and process the monitoring data returned by the detector 2. The single-chip microcomputer is composed of an input circuit, a CPU, a memory, a timer, a comparison circuit, an output circuit, a display terminal, a remote terminal, a device control terminal, other auxiliary circuits, and a software system.

[0028] Specifically, the detector 2 device is installed directly above the top belt roller 4 of the tower crane or in the horizontal transmission area. And the device has a protective shell to prevent rainwater from seeping into the device and avoid rainwater splashing on the belt surface, interfering with the operation of the infrared measurement system inside the detector 2. If there are situations such as high wind force, large load causing belt jitter, tower crane foundation skew, belt 1 damage or local fracture and abnormal stretching in the operating environment, then the belt track marking 9 will show skew, tremor, etc. Through the above monitoring and identification methods, early warning or alarm can be completed relying on the software. If there is a partial or complete fracture of the steel cable or fiber fabric inside the belt 1 during operation, the belt will be stretched and lengthened initially, that is, the operating cycle of the head and tail of the belt 1 becomes longer during operation. After confirmation through monitoring, the machine can be stopped in time to avoid the accident of the complete fracture of the belt 1.

[0029] In one embodiment, through the collaborative work of these components, the single-chip microcomputer can accurately analyze and process the monitoring data returned by the detector 2, monitor the status of the belt of the tower crane in real time, and make corresponding control decisions to maintain the normal operation of the belt and the safety and stability of the system. The display terminal provides an intuitive interface for the operator to check the system status, while the remote terminal allows remote monitoring and control, improving the operation flexibility of the system. Embodiment 2

[0030] Please refer to the appendix Figure 3 , this embodiment provides a detection method for an on-line continuous detection device for a special belt of a tower crane on the basis of the above embodiment; the method includes the following steps: Step 1: According to the stroke and stroke frequency set by the tower crane, convert the travel parameters of the belt 1; Step 2: Monitor the operating state of the belt 1. When it is detected that the belt is offset, the system will give a chain alarm; Step 3: By further detecting the self-state of the belt 1, when the belt 1 shows a stretching deformation, the system will give a chain alarm; Step 4: The single-chip microcomputer has a log recording function, and the operating parameters for a period of time will be recorded for query. The software system presets monitoring countermeasures. For example, only record the occasional data. If the same warning message appears continuously twice in a short time, the system starts to transmit the alarm remotely; if it appears continuously five times, the system automatically controls the tower crane to stop and apply emergency braking.

[0031] In step 1, the first infrared light-emitting diode 5 emits a continuous pulse signal and directly projects it onto the belt track line 9. When the belt 1 is running normally, the first infrared receiving tube 6 receives the reflected signal and outputs a high-level pulse signal to the input circuit. The signal synchronization is confirmed by comparing the circuit with the pulse signal of the first infrared light-emitting diode 5, and then the information is fed back to the CPU for confirmation and recording, and the output circuit displays that the system is running normally.

[0032] In one embodiment, this process ensures that the position and operating state of the belt 1 are monitored in real time, and any desynchronization of the reflected signal caused by belt deviation or other abnormal conditions will be detected by the system. Once an abnormality is detected, the system can take corresponding early warning measures, such as sending an alarm signal, stopping the operation of the tower crane, or notifying the operator to check. Such a continuous monitoring mechanism significantly improves the operating safety and reliability of the tower crane.

[0033] In step 2, the belt trajectory line 9 on the surface of the belt 1 is scanned and tracked by the first infrared light-emitting diode 5 or the first infrared receiving diode 6. If the belt trajectory line 9 always maintains a stable high-level state, the belt runs stably. If the output level of the receiving diode decreases, it indicates that the belt trajectory line 9 is misaligned with the first infrared light-emitting diode 5 or the first infrared receiving diode 6, and it can be determined that the belt 1 is offset. The system will give a chain alarm.

[0034] In one embodiment, through continuous monitoring and real-time feedback, and through continuous signal scanning and monitoring, the system can timely detect any slight offset of the belt and respond quickly. Such an early warning system is crucial for preventing belt failures and reducing potential equipment damage, and at the same time protects the safety of the staff. The chain alarm can include sounds, optical signals or the intervention of other automation systems to ensure that the problem is dealt with in a timely manner.

[0035] In step 2, the single-chip microcomputer processing flow further includes that when the belt 1 is offset due to abnormal movement, the belt trajectory line 9 is misaligned with the first infrared light-emitting diode 5 and the first infrared receiving diode 6, the reflected signal attenuates, and the first infrared receiving diode 6 outputs a low-level pulse signal to the input circuit. The signal is compared with the pulse signal of the first infrared light-emitting diode 5 through a comparison circuit to confirm the signal abnormality, and the information is fed back to the CPU to confirm the abnormal position of the belt 1. The output circuit gives an alarm prompt to the display terminal or transmits it remotely to the remote terminal and records it in the log. If the low-level signal continuously appears, the CPU presets a signal delay. If the signal is not released within the specified time, the output circuit stops the tower crane through the equipment control instruction.

[0036] In one embodiment, according to the judgment result of the CPU, the output circuit gives an alarm prompt to the display terminal and records the abnormal event in the log. At the same time, if the system is set for remote monitoring, the alarm information will also be transmitted remotely to the remote terminal. If the detected low-level signal continuously appears, the CPU will preset a signal delay, that is, give a period of time (specified time) to confirm whether the signal is a short-term false alarm or a continuous abnormality caused by the belt offset. If the low-level signal is not released within the specified time, it indicates that the offset state of the belt 1 has not been corrected. The CPU will issue an equipment control instruction to automatically stop the tower crane through the output circuit to prevent further damage to the belt or cause more serious safety problems.

[0037] In step 3, the second infrared light-emitting diode 7 or the second infrared receiving diode 8 scans and times the head and tail markers 10 on the surface of the belt 1. If the timing time of the detected head and tail signals is consistent with the preset parameters, the self-state of the belt 1 is normal. If the time difference parameter between the two extends, it indicates that the belt 1 has a stretching deformation, and the system will give a chain alarm.

[0038] In one embodiment, the second infrared light-emitting diode 7 emits infrared light towards the head and tail markers 10 on the surface of the belt 1. When the marker 10 passes through the detection area of the second infrared receiving tube 8, the receiving tube records the passing time point. The system presets the normal timing time between the head and tail markers 10. This time reflects the normal cycle period of the belt when there is no stretching or deformation. When the belt 1 runs one week, the system compares the actually detected timing time between the head and tail markers with the preset parameters. If the actual timing time is longer than the preset time, it indicates that the belt 1 may have stretched or deformed during operation because the deformed belt takes longer to complete one cycle. Once the system determines that the belt 1 has stretched or deformed, it will activate the interlock alarm, notify the operator through the sound and light alarm system, and take corresponding safety measures.

[0039] In step three, the second infrared light-emitting diode 7 emits a continuous pulse signal directly towards the two head and tail markers 10 on the belt. When the belt 1 is running normally, the second infrared light-emitting diode 7 receives a weak reflected signal from the belt and outputs a low-level pulse signal to the superimposed timer for timing and accumulation, and outputs it to the CPU for confirmation and recording. When the belt 1 is at the starting end of operation, the head and tail markers 10 trigger the second infrared light-emitting diode 7 to output a high-level pulse signal, and the superimposed timer resets the timing count to zero and outputs it to the CPU for confirmation and recording.

[0040] In one embodiment, when the head and tail markers 10 of the belt 1 pass by the second infrared light-emitting diode 7, they trigger a high-level pulse signal, indicating the start or end of a complete belt cycle. Once the superimposed timer receives the high-level pulse signal, it stops the cumulative timing and resets the timing to zero to prepare for recording the next cycle. All pulse signals and timing results are output to the CPU for confirmation and recording. The CPU analyzes the operating state of the belt based on this data to determine whether there are abnormal conditions such as stretching and deformation.

[0041] In step four, the belt 1 starts to run, and the second infrared light-emitting diode 7 starts to output a low-level pulse signal to the CPU and continues to time until the belt 1 runs to the end. The CPU confirms, continuously records, and repeatedly compares the accumulated data of the timer, calculates the running cycle duration of the belt 1 according to the preset stroke and stroke parameters of the derrick crane, and repeatedly verifies the data. If the verified running time exceeds the limit, it may be that the belt 1 has a broken steel cable or fiber fabric or abnormal load, etc. The output circuit gives an alarm prompt to the display terminal or transmits it remotely to the remote terminal and records it in the log. In severe cases, the derrick crane can be stopped through the equipment control instruction.

[0042] In one embodiment, through these steps, the belt on-line continuous detection device of the tower crane can effectively monitor and maintain the health status of the belt, avoid production interruptions and equipment damage caused by belt problems, and ensure the stable and safe operation of the tower crane.

[0043] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An on-line continuous detection device for a special belt of a tower crane, comprising a belt (1), a single-chip microcomputer and a detector (2), characterized in that, A support (3) is fixedly connected to the upper surface of the detector (2). A support wheel (4) is arranged inside the belt (1). The detector (2) is arranged above the support wheel (4). A corresponding set of belt track lines (9) and start-end markers (10) are provided on the outer side of the belt (1). Below the detector (2), there are a supporting first infrared light-emitting diode (5) and a first infrared receiving diode (6), and a second infrared light-emitting diode (7) and a second infrared receiving diode (8). The first infrared light-emitting diode (5) and the first infrared receiving diode (6) are in a paired transmitting and receiving relationship. The second infrared light-emitting diode (7) and the second infrared receiving diode (8) are in a paired transmitting and receiving relationship. The corresponding points of the detection light spots of the two are respectively the belt track lines (9) and the start-end markers (10) on the belt.

2. The on-line continuous detection device for the special belt of the tower crane according to claim 1, characterized in that The detector (2) belongs to an infrared serial communication circuit with an external single-chip microcomputer and is composed of two groups of infrared transmitting circuits, an infrared signal receiving circuit, and a signal output circuit. Each group of infrared transmitting circuits can convert a binary pulse modulation signal into an optical pulse signal, project it onto the belt track lines (9) and the start-end markers (10), generate an optical reflection pulse signal that is received by the infrared signal receiving circuit, and after being filtered and amplified by the signal output circuit, it is output to the single-chip microcomputer for demodulation to restore the digital signal, thereby realizing the basic detection of the position of the belt (1).

3. The on-line continuous detection device for the special belt of the tower crane according to claim 1, characterized in that, A control box is fixedly connected to one side of the outer wall of the support (3). The single-chip microcomputer is fixedly connected inside the control box and is used to analyze and process the monitoring data returned by the detector (2). The single-chip microcomputer is composed of an input circuit, a CPU, a memory, a timer, a comparison circuit, an output circuit, a display terminal, a remote terminal, a device control terminal, other auxiliary circuits, and a software system.

4. Detection method of an on-line continuous detection device for a special belt of a tower crane, according to any one of claims 1-3, an on-line continuous detection device for a special belt of a tower crane, characterized in that, It includes the following steps: Step 1: According to the stroke and stroke frequency set by the derrick, convert the travel parameters of the belt (1); Step 2: Monitor the operating state of the belt (1). When it is detected that the belt is offset, the system will give a chain alarm; Step 3: Further detect the self-state of the belt (1). When the belt (1) shows a stretching deformation, the system will give a chain alarm; Step 4: The single-chip microcomputer has a log recording function. The operating parameters for a period of time will be recorded for query. The software system presets monitoring countermeasures. For example, only record occasional data. When the same alarm message appears continuously twice in a short period of time, the system starts alarm remote transmission; When it appears continuously five times, the system automatically controls the derrick to stop and apply emergency braking.

5. The detection method of an on-line continuous detection device for a special belt of a tower crane according to claim 4, characterized in that, In the first step, the first infrared light-emitting diode (5) emits a continuous pulse signal and directly projects it onto the belt track line (9). When the belt (1) is running normally, the first infrared receiving diode (6) receives the reflected signal, outputs a high-level pulse signal to the input circuit, and through the comparison circuit, compares it with the pulse signal of the first infrared light-emitting diode (5) to confirm signal synchronization, and then feeds the information back to the CPU for confirmation and recording. The output circuit indicates that the system is running normally.

6. The detection method of an on-line continuous detection device for a special belt of a tower crane according to claim 4, characterized in that, In the second step, the belt track line (9) on the surface of the belt (1) is scanned and tracked by the first infrared light-emitting diode (5) or the first infrared receiving diode (6). If the belt track line (9) always maintains a high-level stable state, the belt runs stably. If the output level of the receiving diode decreases, it indicates that the belt track line (9) is misaligned with the first infrared light-emitting diode (5) or the first infrared receiving diode (6), and it can be determined that the belt (1) is offset. The system will give a chain alarm.

7. The detection method of a special belt online continuous detection device for a tower crane according to claim 4, characterized in that, In the second step, the single-chip microcomputer processing flow further includes that when the belt 1 is offset due to abnormal movement, the belt track line (9) is misaligned with the first infrared light-emitting diode (5) and the first infrared receiving diode (6), the reflected signal attenuates, and the first infrared receiving diode (6) outputs a low-level pulse signal to the input circuit. The signal is compared with the pulse signal of the first infrared light-emitting diode (5) through the comparison circuit to confirm the signal abnormality. The information is fed back to the CPU to confirm the abnormal position of the belt (1). The output circuit gives an alarm prompt and makes a log record to the display terminal or transmits it remotely to the remote terminal. If the low-level signal continues to appear, the CPU presets a signal delay. If the signal is not released within the specified time, the output circuit stops the tower crane through the equipment control instruction.

8. The detection method of an on-line continuous detection device for a special belt of a tower crane according to claim 4, characterized in that, In the third step, the second infrared light-emitting diode (7) or the second infrared receiving diode (8) scans, times, and tracks the head and tail markers (10) on the surface of the belt (1). If the timing time of the detected head and tail signals matches the preset parameters, the self-state of the belt (1) is normal. If the time difference parameter between the two extends, it indicates that the belt (1) has a stretching deformation, and the system will give a chain alarm.

9. The detection method of an on-line continuous detection device for a special belt of a tower crane according to claim 4, characterized in that, In the third step, the second infrared light-emitting diode (7) emits continuous pulse signals directly projected onto the two head and tail markers (10) on the belt. When the belt (1) runs normally, the second infrared light-emitting diode (7) receives a weak reflected signal from the belt and outputs a low-level pulse signal to the superimposed timer for timing and accumulation, and then outputs it to the CPU for confirmation and recording. When the belt (1) is at the starting end of the operation, the head and tail marker (10) triggers the second infrared light-emitting diode (7) to output a high-level pulse signal, and the superimposed timer resets the timing count and outputs it to the CPU for confirmation and recording.

10. The detection method of a special belt online continuous detection device for a tower crane according to claim 4, characterized in that, In the fourth step, when the belt (1) starts to run, the second infrared light-emitting diode (7) starts to output a low-level pulse signal to the CPU and continues to time until the belt (1) runs to the end. The CPU confirms, continuously records, and repeatedly compares the accumulated data of the timer. According to the preset stroke and stroke parameters of the tower crane, the running cycle duration of the belt (1) is calculated, and the data is repeatedly verified. If the verified running time exceeds the limit, it may be that the steel cable or fiber fabric of the belt (1) is broken or the load is abnormal, etc. The output circuit gives an alarm prompt and makes a log record to the display terminal or transmits it remotely to the remote terminal. In serious cases, the tower crane can be stopped through the equipment control instruction.

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