CN114199562A

CN114199562A - Fault monitoring device and method for transmission mechanism of crane

Info

Publication number: CN114199562A
Application number: CN202111527363.7A
Authority: CN
Inventors: 薛志钢; 许晨旭; 苏文胜; 范雪骐; 巫波; 徐鹏程; 王欣仁
Original assignee: Special Equipment Safety Supervision Inspection Institute of Jiangsu Province
Current assignee: Special Equipment Safety Supervision Inspection Institute of Jiangsu Province
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-03-18
Anticipated expiration: 2041-12-14
Also published as: CN114199562B

Abstract

The invention discloses a fault monitoring device and method for a transmission mechanism of a crane, wherein the device is used for monitoring the fault of a transmission chain of the crane and comprises the following steps: the ultrasonic flaw detection device comprises a shaping mechanism, an ultrasonic flaw detection assembly and a monitoring terminal, wherein the shaping mechanism is arranged in a non-motion interference area where a transmission chain runs in a transmission manner and is used for inhibiting vibration of the transmission chain, the shaping mechanism is provided with an input end and an output end, and the transmission chain penetrates through the input end of the shaping mechanism and penetrates out of the output end of the shaping mechanism; the ultrasonic flaw detection assembly is arranged in the shaping mechanism and is used for carrying out ultrasonic detection on each chain link of the transmission chain penetrating into the shaping mechanism to generate ultrasonic detection data; the monitoring terminal is connected with the ultrasonic flaw detection assembly and is used for receiving ultrasonic detection data generated by the ultrasonic flaw detection assembly; the scheme has the advantages of high detection response speed and stable and reliable implementation under the condition of reducing manpower expenditure, and provides a solid and reliable hardware scheme and a monitoring strategy for fault monitoring of the transmission chain of the crane.

Description

Fault monitoring device and method for transmission mechanism of crane

Technical Field

The invention relates to the technical field of operation monitoring of mechanical parts, in particular to a fault monitoring device and method for a transmission mechanism of a crane.

Background

The crane is a common device in the industrial production and transfer process, the transmission chain is used as an important power transmission component, and bears huge transmission pressure in the process of bearing power transmission, wherein the damage of the transmission chain is a high-risk device fault accident in the use process of the crane, especially when the crane lifts and transfers objects, once the transmission chain is broken or stuck, a large safety risk is caused, although some schemes specially and timely intervene and protect the breakage of the transmission chain at present, the schemes are measures aiming at the intervention after the accident, and the maintenance of the transmission chain is mostly a scheme of regular maintenance, and the scheme has certain hysteresis or randomness because the damage of the transmission chain is mostly in the use process, especially for some situations close to critical use, once the problem cannot be timely found in the maintenance, therefore, how to monitor the health state of the transmission chain during operation is a very realistic topic.

Disclosure of Invention

Aiming at the conditions of the prior art, the invention aims to provide a crane transmission mechanism fault monitoring device and method which are reliable in response, rapid and convenient in monitoring and small in interference on transmission chain use.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:

crane drive mechanism fault monitoring device for the drive chain fault monitoring of hoist, it includes:

the shaping mechanism is arranged in a non-motion interference area where the transmission chain runs in a transmission manner and is used for inhibiting the vibration of the transmission chain, the shaping mechanism is provided with an input end and an output end, and the transmission chain penetrates through the input end of the shaping mechanism and penetrates out of the output end of the shaping mechanism;

the ultrasonic flaw detection assembly is arranged in the shaping mechanism and is used for carrying out ultrasonic detection on each chain link of the transmission chain penetrating into the shaping mechanism to generate ultrasonic detection data;

and the monitoring terminal is connected with the ultrasonic flaw detection assembly and is used for receiving ultrasonic detection data generated by the ultrasonic flaw detection assembly.

As a possible implementation, further, the reshaping mechanism includes:

the connecting frame is fixedly arranged in a non-motion interference area where the transmission chain runs, an accommodating cavity is formed at the upper part of the connecting frame, the horizontal two ends of the accommodating cavity are both open structures and are respectively arranged as an input end and an output end, and the transmission chain penetrates through the input end and the output end of the accommodating cavity;

spacing subassembly, for a pair of and set up input and the output in the holding chamber respectively, spacing subassembly includes:

the first movable rods are in a pair and are respectively and slidably and oppositely arranged at the upper end and the lower end of the accommodating cavity of the connecting frame in a penetrating way, first external threads are arranged on the first movable rods, a first extending part is arranged at the end of the first movable rod, which is positioned outside the accommodating cavity, and first avoidance holes for the first movable rods to penetrate in a sliding way are correspondingly arranged at the parts of the connecting frame at the upper end and the lower end of the accommodating cavity;

the first limiting plate is fixed at the end of the first movable rod penetrating into the accommodating cavity, and the edge of the end face of the first limiting plate, which is far away from the first movable rod, is an arc-shaped face;

the first nut is in threaded connection with a first external thread of the first movable rod outside the accommodating cavity;

the first spring is sleeved on the first movable rod, one end of the first spring is abutted against the first limiting plate, and the other end of the first spring is abutted against the inner wall of the accommodating cavity so as to restrain and fix the first movable rod;

the second movable rods are in a pair and are respectively and slidably arranged on the two horizontal sides of the accommodating cavity of the connecting frame in a penetrating mode relatively, second external threads are arranged on the second movable rods, a second extending part is arranged at the end, located outside the accommodating cavity, of each second movable rod, and second avoiding holes for the second movable rods to penetrate in a sliding mode are correspondingly formed in the connecting frame parts on the two horizontal sides of the accommodating cavity;

the second limiting plate is fixed at the end of the second movable rod penetrating into the accommodating cavity, and the edge of the end face, far away from the second movable rod, of the second limiting plate is an arc-shaped face;

the second nut is in threaded connection with a second external thread of the second movable rod in the accommodating cavity;

the second spring is sleeved on the second movable rod, one end of the second spring is abutted against the second extending part, and the other end of the second spring is abutted against the outer wall of the connecting frame so as to restrain and fix the second movable rod;

the first limiting plates on the pair of first movable rods and the second limiting plates on the pair of second movable rods surround to form a vibration suppression area, and the transmission chain penetrates through the vibration suppression area;

in addition, the probe end of ultrasonic inspection subassembly penetrates between the input and the output in holding chamber, just the probe end of ultrasonic inspection subassembly is just penetrating the driving chain one side in the holding chamber and is used for carrying out ultrasonic real-time detection to each chain link of driving chain after the vibration suppression is handled.

As a preferred alternative, further, the apparatus further comprises:

a lubricating medium container for storing lubricating oil;

the first oil pump is arranged on the connecting frame, the input end of the first oil pump is connected with the lubricating medium container through a pipeline, the output end of the first oil pump is connected with a first nozzle, the liquid output end of the first nozzle extends to the position above a transmission chain between the input end of the accommodating cavity and the ultrasonic flaw detection assembly, and lubricating oil in the lubricating medium container is sprayed to the transmission chain through the first nozzle by the first oil pump;

the first air pump is arranged on the connecting frame, the input end of the first air pump is communicated with the outside, the output end of the first air pump is connected with a first air nozzle, the gas output end of the first air nozzle extends to the position above a transmission chain between the first nozzle and the ultrasonic flaw detection assembly, and external air is sprayed to the transmission chain through the first air nozzle by the first air pump;

the controller is connected with the first oil pump and the first air pump and is used for controlling the opening and closing of the first oil pump and the first air pump;

the included angle alpha formed between the first nozzle and the transmission chain is 45-60 degrees, and the included angle beta formed between the first air nozzle and the transmission chain is 45-60 degrees.

As a preferred alternative embodiment, further, the ultrasonic testing module includes:

the detection end of the ultrasonic detection probe penetrates into the connecting frame from one side of the connecting frame and is used for outputting detection ultrasonic waves and receiving reflected feedback ultrasonic waves;

the baffle sets up in the holding intracavity and is relative with ultrasonic detection probe's probe end, and the baffle is kept away from the terminal surface that ultrasonic detection surveyed and is fixed with the link through the connecting rod, form the detection zone that is used for passing the driving chain between ultrasonic detection probe and the baffle.

As a preferred optional implementation manner, further, the accommodating cavity is further provided with a bracket corresponding to the ultrasonic flaw detection assembly, the bracket is of a concave structure, and the edges of the upper end face of the concave structure are all in arc transition.

As a preferred alternative, further, the apparatus further comprises:

the second oil pump is arranged on the connecting frame, the input end of the second oil pump is connected with the lubricating medium container pipeline, the output end of the second oil pump is connected with a second nozzle, the liquid output end of the second nozzle extends to the position above a transmission chain between the output end of the accommodating cavity and the ultrasonic flaw detection assembly, and lubricating oil in the lubricating medium container is sprayed to the transmission chain through the second nozzle by the second oil pump;

the second oil pump is also connected with the controller and is controlled to be opened and closed by the controller;

in addition, an included angle gamma formed between the second nozzle and the transmission chain is 45-60 degrees.

As a preferred alternative, further, the apparatus further comprises:

the first recovery cylinder is of a conical tubular structure with two open ends, the large opening end of the first recovery cylinder faces upwards and is vertically arranged between the bracket and the input end of the accommodating cavity and is opposite to the first nozzle and the first air nozzle, the transmission chain stretches over the large opening end of the first recovery cylinder, and the small opening end of the first recovery cylinder is provided with a first electric control valve;

the first transfer box is arranged at one side of the first recovery cylinder side by side, the upper end of the first transfer box is not higher than the upper end surface of the first recovery cylinder, the first transfer box and the first recovery cylinder are communicated through a first U-shaped pipe, one end of the first U-shaped pipe penetrates into the first recovery cylinder and extends to the middle part of the first recovery cylinder, the other end of the first U-shaped pipe penetrates into the first transfer box and extends to the upper part of the first transfer box, and in addition, the U-shaped bent part of the first U-shaped pipe penetrates into the upper part of the first recovery cylinder and is not higher than the upper end of the first recovery cylinder;

the input end of the first pump is communicated with the small opening end of the first recovery cylinder through a first pipeline and is used for outputting the solid-liquid mixture precipitated at the lower end of the first recovery cylinder;

the second recovery cylinder is of a conical tubular structure with two open ends, the large opening end of the second recovery cylinder faces upwards and is vertically arranged between the bracket and the output end of the accommodating cavity and opposite to the second nozzle, the transmission chain stretches across the upper part of the large opening end of the second recovery cylinder, and the small opening end of the second recovery cylinder is provided with a second electric control valve;

the second transfer box is arranged at one side of the second recovery cylinder side by side, the upper end of the second transfer box is not higher than the upper end surface of the second recovery cylinder, the second transfer box and the second recovery cylinder are communicated through a second n-shaped pipe, one end of the second n-shaped pipe penetrates into the second recovery cylinder and extends to the middle part of the second recovery cylinder, the other end of the second n-shaped pipe penetrates into the second transfer box and extends to the upper part of the second transfer box, and in addition, the n-shaped bent part of the second n-shaped pipe penetrates into the upper part of the second recovery cylinder and is not higher than the upper end of the second recovery cylinder;

the input end of the second pump is communicated with the small-opening end of the second recovery cylinder through a second pipeline and is used for outputting the solid-liquid mixture precipitated at the lower end of the second recovery cylinder;

the sediment recovery box is respectively connected with the output end pipelines of the first pump and the second pump and is used for storing the solid-liquid mixture conveyed by the first pump and the second pump;

the bottom in the bracket concave structure is provided with an arched part with an arc structure, and liquid guide grooves are correspondingly and obliquely arranged on the side surfaces, close to the first recovery cylinder and the second recovery cylinder, of the bottom in the bracket concave structure;

in addition, the first electric control valve, the second electric control valve, the first pump and the second pump are all connected with the controller and are controlled to be opened and closed by the controller.

As a preferred optional embodiment, further, the lower part of the first transfer box is communicated with the lubricating medium container through a third pipeline, a third electric control valve is arranged at the end part of the third pipeline close to the first transfer box, and a third pump is arranged at the end part of the third pipeline close to the lubricating medium container;

the lower part of the second transfer box is communicated with the lubricating medium container through a fourth pipeline, a fourth electric control valve is arranged at the end part of the fourth pipeline close to the second transfer box, and a fourth pump is arranged at the end part of the fourth pipeline close to the lubricating medium container;

and the third electric control valve, the fourth electric control valve, the third pump and the fourth pump are all connected with the controller and are controlled to be opened and closed by the controller.

As a preferred alternative embodiment, further, the end of the first n-shaped pipe near the first transit box is provided with a first water flow sensor connected to the controller for feeding back the state of liquid flow inside the first n-shaped pipe;

a second water flow sensor is arranged at the end part of the second inverted U-shaped pipe close to the second transfer box, and the second water flow sensor is connected with the controller and is used for feeding back the liquid flowing state in the second inverted U-shaped pipe;

the first inverted U-shaped pipe penetrates into the outer side of the end part of the first transfer box, a first sliding sleeve is further slidably sleeved on the outer side of the end part of the first inverted U-shaped pipe, a first sealing ring is fixedly arranged between the first sliding sleeve and the first inverted U-shaped pipe, the lower end of the first sliding sleeve is connected with a first pull rod, the lower end of the first pull rod extends downwards and penetrates through a first recovery cylinder, a first sealing element is arranged at the position, corresponding to the penetrating position of the first pull rod, of the first recovery cylinder, and the first sliding sleeve is driven to slide on the end part of the first inverted U-shaped pipe by lifting and pulling of the first pull rod;

the second arched tube penetrates the tip outside of second transfer incasement and still slides the cover and is equipped with the second sliding sleeve, the fixed second sealing washer that is provided with between second sliding sleeve and the second arched tube, the lower extreme of second sliding sleeve is connected with the second pull rod, the lower extreme downwardly extending of second pull rod just passes the second recovery section of thick bamboo, and the position of putting of wearing that the second recovery section of thick bamboo corresponds the second pull rod is equipped with the second sealing member, it slides on the tip of second arched tube to stimulate the drive second sliding sleeve by the lift of second pull rod.

Based on the device, the invention also provides a fault monitoring method for the transmission mechanism of the crane, which comprises the fault monitoring device for the transmission mechanism of the crane, and the monitoring method comprises the following steps:

(1) the monitoring terminal establishes a monitoring database, and ultrasonic detection data of the transmission chain under different health conditions and different transmission speeds are stored in the monitoring database;

(2) the crane is started, and the transmission chain is driven by the driving force to operate in a transmission way;

(3) the controller controls the first oil pump, the second oil pump, the first air pump and the ultrasonic flaw detection assembly to start, so that lubricating oil is sprayed to the transmission chain when the transmission chain enters a detection area, residual stains and dust on the surface of the transmission chain are washed, and the transmission chain enters the detection area after being subjected to air injection treatment by the first air pump;

(4) the ultrasonic detection probe of the ultrasonic flaw detection assembly carries out ultrasonic detection on each chain link of the transmission chain entering the detection area to obtain ultrasonic detection data, the ultrasonic detection data are transmitted to the monitoring terminal for detection and judgment, and when the ultrasonic detection data do not meet the preset requirements, the monitoring terminal outputs an early warning signal;

(5) the detected transmission chain moves out of the detection area along the transmission direction, and passes through the shaping mechanism after secondary spraying of lubricating oil is carried out on the second oil pump;

(6) the first recovery cylinder continuously receives the dripped lubricating liquid, when the height of the lubricating liquid exceeds the inverted U-shaped bending part of the first inverted U-shaped pipe, the lubricating liquid enters the first transfer box and forms siphon suction to suck the lubricating liquid with the liquid level higher than the lower end of the first sliding sleeve, so that the lubricating liquid is passively sucked into the first transfer box, meanwhile, the first water flow sensor senses the flow of the fluid in the first inverted U-shaped pipe to generate a sensing signal, the sensing signal is transmitted to the controller, the controller counts, when the counting value reaches a preset value, the controller controls the third electric control valve to open, then controls the third pump to start, and conveys the lubricating liquid in the first inverted U-shaped pipe to the lubricating medium container; the second recovery cylinder continuously receives the dripped lubricating liquid, when the height of the lubricating liquid exceeds the inverted U-shaped bending part of the second inverted U-shaped pipe, the lubricating liquid enters the second intermediate transfer box and forms siphon suction to suck the lubricating liquid with the liquid level higher than the lower end of the second sliding sleeve, so that the lubricating liquid is passively sucked into the second intermediate transfer box, meanwhile, the second water flow sensor senses the flow of the fluid in the second inverted U-shaped pipe to generate a sensing signal, the sensing signal is transmitted to the controller, the controller counts, when the counting value reaches a preset value, the controller controls the fourth electric control valve to be opened, then controls the fourth pump to be started, and conveys the lubricating liquid in the first intermediate transfer box to the lubricating medium container; after the third electric control valve, the fourth electric control valve, the third pump and the fourth pump are started for a preset time, the third electric control valve, the fourth electric control valve, the third pump and the fourth pump are closed;

(7) the controller controls the second electric control valve and the third electric control valve to be opened, then controls the first pump and the second pump to be started, so that solid-liquid mixtures at the lower parts of the first recovery cylinder and the second recovery cylinder are respectively pumped to the sediment recovery box by the first pump and the second pump, wherein the first electric control valve, the second electric control valve, the first pump and the second pump are closed after the first electric control valve, the second electric control valve, the first pump and the second pump are started for a preset time.

By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: the transmission chain vibration suppression device has the advantages that the shaping mechanism is arranged in the non-motion interference area of the transmission chain of the crane to suppress vibration of the transmission chain, so that the transmission chain can be kept stable during ultrasonic detection, the first oil pump and the first air pump arranged in the shaping mechanism can clean the transmission chain to be detected, the surface cleanliness of the transmission chain is improved, ultrasonic detection data with reference value can be obtained during subsequent ultrasonic detection, lubricating oil is applied to the transmission chain after detection through the second oil pump, so that the lubricating oil can be timely reapplied to improve the service life of the transmission chain and the lubrication degree of mechanical matching after the transmission chain is detected, in addition, the lubricating oil dropping from the transmission chain is matched and recycled through the parts of the first recovery cylinder and the second recovery cylinder, the waste of the lubricating oil is avoided, and the use economy of the device is improved, on the aspect of identification and judgment of ultrasonic detection data, the detection neural network is ingeniously introduced to process, the trained detection neural network can be used for greatly improving the detection efficiency, reducing the labor expenditure and improving the response speed of detection, and a solid and reliable monitoring strategy is provided for transmission chain detection.

Drawings

The invention will be further explained with reference to the drawings and the detailed description below:

FIG. 1 is a schematic view of a schematic connection structure of the apparatus of the present invention;

FIG. 2 is a schematic view of the shaping mechanism and ultrasonic detection assembly of the device of the present invention in a simplified configuration;

FIG. 3 is an enlarged view of a portion of the structure at A in FIG. 2;

FIG. 4 is an enlarged view of a portion of the structure at B in FIG. 2;

FIG. 5 is a schematic diagram of an implementation structure of a limiting component in a shaping mechanism of the device according to the present embodiment;

FIG. 6 is a schematic view of the ultrasonic inspection module of the apparatus of the present embodiment in a set position within the shaping structure;

fig. 7 is a schematic flow chart of an implementation of a monitoring method based on the device of the present embodiment.

Detailed Description

As shown in one of fig. 1 to 6, the present solution is a crane transmission mechanism fault monitoring device for monitoring a fault of a transmission chain 3 of a crane, which includes:

the shaping mechanism 1 is arranged in a non-motion interference area where the transmission chain 3 operates in a transmission manner and is used for inhibiting vibration of the transmission chain 3, the shaping mechanism 1 is provided with an input end 112 and an output end 113, and the transmission chain 3 penetrates through the input end 112 of the shaping mechanism 1 and penetrates out of the output end 113 of the shaping mechanism;

the ultrasonic flaw detection assembly 2 is arranged in the shaping mechanism 1 and is used for carrying out ultrasonic detection on each chain link of the transmission chain 3 penetrating into the shaping mechanism 1 to generate ultrasonic detection data;

and the monitoring terminal is connected with the ultrasonic flaw detection assembly 2 and is used for receiving ultrasonic detection data generated by the ultrasonic flaw detection assembly 2.

In this scheme, plastic mechanism 1 includes:

the connecting frame 11 is fixedly arranged in a non-motion interference area where the transmission chain 3 operates in a transmission manner, an accommodating cavity 111 is formed at the upper part of the connecting frame 11, both horizontal ends of the accommodating cavity 111 are in an open structure and are respectively provided with an input end 112 and an output end 113, and the transmission chain 3 penetrates through the input end 112 and the output end 113 of the accommodating cavity 111;

spacing subassembly 12, be a pair and set up input 112 and output 113 at holding chamber 111 respectively, spacing subassembly 12 includes:

the first movable rods 121 are paired and are respectively slidably and relatively penetrated at the upper end and the lower end of the accommodating cavity 111 of the connecting frame 11, the first movable rods 121 are respectively provided with a first external thread 1211, the end of the first movable rod 121 outside the accommodating cavity 111 is provided with a first extending part 1212, and the connecting frame 11 at the upper end and the lower end of the accommodating cavity 111 is correspondingly provided with a first avoiding hole 122 for the first movable rod 121 to penetrate in a sliding manner;

the first limiting plate 123 is fixed at the end of the first movable rod 121 penetrating into the accommodating cavity 111, and the edge of the end face, away from the first movable rod 121, of the first limiting plate 123 is an arc-shaped face;

a first nut 124 screwed on the first external thread 1211 of the first movable rod 121 outside the receiving cavity 111;

the first spring 122 is sleeved on the first movable rod 121, one end of the first spring abuts against the first limiting plate 123, and the other end of the first spring abuts against the inner wall of the accommodating cavity 111 to restrain and fix the first movable rod 121;

the second movable rods 124 are a pair and are respectively and slidably and relatively arranged on two horizontal sides of the accommodating cavity 111 of the connecting frame 11 in a penetrating manner, second external threads 1241 are arranged on the second movable rods 124, a second extending part 1242 is arranged at the end of the second movable rod 124, which is positioned outside the accommodating cavity 111, and second avoiding holes for the second movable rods 124 to slidably penetrate are correspondingly arranged on the parts, on the two horizontal sides of the accommodating cavity 111, of the connecting frame 11;

the second limiting plate 125 is fixed at the end of the second movable rod 124 penetrating into the accommodating cavity 111, and the edge of the end surface of the second limiting plate 125 far away from the second movable rod 124 is an arc surface;

the second nut 127 is screwed on the second external thread 1241 of the second movable rod 124 in the accommodating cavity 111;

the second spring 126 is sleeved on the second movable rod 124, one end of the second spring abuts against the second extension part 1242, and the other end of the second spring abuts against the outer wall of the connecting frame 11, so that the second movable rod 124 is restrained and fixed;

a vibration suppression area 128 is formed between the first limit plate 123 on the pair of first movable rods 121 and the second limit plate 125 on the pair of second movable rods 124 in a surrounding manner, and the transmission chain 3 passes through the vibration suppression area; in the scheme, the distance between the vibration suppression areas 128 in the transverse direction and the longitudinal direction can be adjusted by rotating and adjusting the first nut 124 and the second nut 127, so that the suppression of the vibration or the shaking of the transmission chain 3 in the transverse direction and the longitudinal direction is realized;

in addition, the detection end 211 of the ultrasonic inspection assembly 2 penetrates between the input end 112 and the output end 113 of the accommodating cavity 111, and the detection end 211 of the ultrasonic inspection assembly 2 is right opposite to one side of the transmission chain 3 penetrating into the accommodating cavity 111 and is used for carrying out ultrasonic real-time detection on each chain link of the transmission chain 3 after vibration suppression treatment.

In order to overcome the problem that the transmission chain 3 adheres to fragments worn by mechanical cooperation and dust in air during transmission operation, so that stains adhere to the surfaces of the chain links, the interference factors influence the detection accuracy of the ultrasonic flaw detection assembly 2 to a certain extent and cause a certain deviation on detection data, and thus the data reference performance is reduced, the present scheme is taken as a preferred embodiment, and further, the device further comprises:

a lubricating medium container 4 for storing lubricating oil;

the first oil pump 5 is arranged on the connecting frame 11, the input end of the first oil pump is connected with the lubricating medium container 4 through a pipeline, the output end of the first oil pump is connected with the first nozzle 51, the liquid output end of the first nozzle 51 extends to the upper part of the transmission chain 3 between the input end 112 of the accommodating cavity 111 and the ultrasonic flaw detection assembly 2, and the lubricating oil in the lubricating medium container 4 is sprayed to the transmission chain 3 through the first nozzle 51 by the first oil pump 5;

the first air pump 6 is arranged on the connecting frame 11, the input end of the first air pump is communicated with the outside, the output end of the first air pump is connected with a first air nozzle 61, the air output end of the first air nozzle 61 extends to the position above the transmission chain 3 between the first nozzle 51 and the ultrasonic flaw detection assembly 2, and external air is sprayed to the transmission chain 3 through the first air nozzle 61 by the first air pump 6;

the controller is connected with the first oil pump 5 and the first air pump 6 and is used for controlling the opening and closing of the first oil pump 5 and the first air pump 6;

wherein, the included angle α formed between the first nozzle 51 and the transmission chain 3 is 45 to 60 degrees, the output end of the first nozzle 51 is a flat opening, the lubricant oil sprayed out can cover the transverse area (i.e. the thickness direction) of the transmission chain 3, and the spraying pressure of the first nozzle 51 can be 0.01 to 0.05MPa, preferably 0.03MPa, because when the first nozzle 51 sprays out the lubricant oil, the lubricant oil acts on the transmission chain 3, and when the transmission chain 3 is stressed, the vibration amplitude of the transmission chain 3 can be increased along with the increase of the stress, therefore, once the spraying pressure of the first nozzle 51 exceeds 0.05MPa, the transmission chain 3 can be greatly vibrated due to the acting force on the transmission chain 3, thereby the subsequent detection of the ultrasonic flaw detection assembly 2 can be influenced, and if the pressure is less than 0.01MPa, the output force can be too small, the lubricant oil can not be sprayed onto the transmission chain 3 at a specific angle, the spraying angle directly affects the angle of the lubricating oil reaching the transmission chain 3, if the spraying angle is greater than 60 degrees, the lubricating oil is likely to generate vertical sputtering when acting on the surface of the transmission chain 3 due to high perpendicularity, if the spraying angle is less than 45 degrees, the included angle is likely to be too small, so that the lubricating oil cannot be forced to peel off stains attached to the transmission chain 3 after being sprayed out and contacting with the transmission chain 3, the included angle beta formed between the first air nozzle 61 and the transmission chain 3 is 45-60 degrees and is also based on the stress, the air blowing and washing are mainly used for conveniently carrying out air blowing and washing on the transmission chain 3 attached with the lubricating oil, an air curtain is formed at the same time, the transmission chain 3 attached with more lubricating oil is prevented from entering the detection area of the ultrasonic flaw detection assembly 2, and the first air nozzle 61 is also in a flat opening structure.

Since the first air pump 6 blows most of the lubricating oil off the transmission chain 3, there may be a situation of insufficient lubrication in the transmission chain 3, and in order to avoid this situation, as a preferred embodiment, the apparatus further includes:

the second oil pump 7 is arranged on the connecting frame 11, the input end of the second oil pump is connected with the lubricating medium container 4 through a pipeline, the output end of the second oil pump is connected with the second nozzle 71, the liquid output end of the second nozzle 71 extends to the position above the transmission chain 3 between the output end of the accommodating cavity 111 and the ultrasonic flaw detection assembly 2, and the lubricating oil in the lubricating medium container 4 is sprayed to the transmission chain 3 through the second nozzle 71 by the second oil pump 7;

the second oil pump 7 is also connected with the controller and is controlled by the controller to be opened and closed;

the angle γ formed between the second nozzle 71 and the transmission chain 3 is 45 to 60 degrees, and the angle is selected with reference to the first nozzle 51, and similarly, the ejection pressure of the second nozzle 71 may be 0.01 to 0.05MPa, preferably 0.03 MPa.

Under this scheme structure, the main effect that first nozzle 51 spouts the lubricating oil on drive chain 3 is to clean lubricating oil, and first air cock 61 carries out air purge in addition, helps improving the cleanliness on drive chain 3 surface, and second nozzle 71 spouts lubricating oil on drive chain 3 is for rust-resistant and the degree of lubrication of improvement machinery complex is carried out to drive chain 3, reduces wearing and tearing, improves life.

In ultrasonic testing, the ultrasonic testing module 2 according to the present embodiment includes:

an ultrasonic detection probe 21, the detection end 211 of which penetrates into the connecting frame 11 from one side of the connecting frame 11 and is used for outputting detection ultrasonic waves and receiving reflected feedback ultrasonic waves;

the baffle 22 is arranged in the accommodating cavity 111 and is opposite to the detection end of the ultrasonic detection probe 21, the baffle 22 is far away from the end face of the ultrasonic detection probe and is fixed with the connecting frame 11 through a connecting rod 23, and a detection area 24 for penetrating through the transmission chain 3 is formed between the ultrasonic detection probe 21 and the baffle 22; in this embodiment, the main function of the baffle 22 is to provide a feedback limit or mark for detecting the waveform cutoff, because the position of the baffle 22 is fixed, when the detection ultrasonic wave output by the ultrasonic detection probe 21 propagates to the baffle 22, the generated waveform data is a fixed position or close to the fixed position (propagation distance, velocity are fixed) after the ultrasonic wave fed back is received, and therefore, the presence of the baffle 22 helps to separate the detection data, and avoid data interference (i.e. noise) caused by other irregular non-detection objects to the detection result.

And spout lubricating oil to drive chain 3 through first oil pump 5 on, it more or less can cause drive chain 3 to move to detection zone 24, the condition that a small amount of drippage of lubricating oil appears, in order to be convenient for get rid of and guide it, in this scheme, as a preferred selection implementation mode, further, holding chamber 111 still is equipped with bracket 116 corresponding ultrasonic inspection subassembly 2, bracket 116 is the spill structure, and the up end edge of its spill structure is the arc transition.

In order to avoid waste and pollution of the working area of the equipment, because the first oil pump 5 and the second oil pump 7 may be in excess when applying lubricating oil to the transmission chain 3, as a preferred embodiment, the apparatus further comprises:

the first recycling cylinder 8 is a conical cylindrical structure with two open ends, the large opening end of the first recycling cylinder is upward and vertically arranged between the bracket 116 and the input end of the accommodating cavity 111, the first nozzle 51 is opposite to the first air nozzle 61, the transmission chain 3 stretches across the large opening end of the first recycling cylinder 8, and the small opening end of the first recycling cylinder 8 is provided with a first electric control valve 81;

the first transfer box 82, set up in one side of the first recovery cylinder 8 side by side, its upper end is not higher than the upper end of the first recovery cylinder 8, said first transfer box 82 and first recovery cylinder 8 are communicated through the first n-shaped pipe 83, wherein, one end of the first n-shaped pipe 83 is penetrated into the first recovery cylinder 8 and extended to the middle part of the first recovery cylinder 8, another end of the first n-shaped pipe 83 is penetrated into the first transfer box 82 and extended to the upper portion of the first transfer box 82, in addition, the n-shaped turning department of the first n-shaped pipe 83 is penetrated and put in the upper portion of the first recovery cylinder 8 and not higher than the upper end of the first recovery cylinder 8;

a first pump 85, an input end of which is communicated with the small end of the first recovery cylinder 8 through a first pipeline 851 and is used for outputting a solid-liquid mixture precipitated at the lower end of the first recovery cylinder 8;

the second recovery cylinder 9 is a conical cylindrical structure with two open ends, the large opening end of the second recovery cylinder is upward and vertically arranged between the bracket 116 and the output end of the accommodating cavity 111 and is opposite to the second nozzle 71, the transmission chain 3 stretches across the upper part of the large opening end of the second recovery cylinder 9, and the small opening end of the second recovery cylinder 9 is provided with a second electric control valve 91;

a second transfer box 92 arranged side by side at one side of the second recovery cylinder 9, the upper end of which is not higher than the upper end of the second recovery cylinder 9, the second transfer box 92 and the second recovery cylinder 9 are communicated through a second U-shaped pipe 93, wherein one end of the second U-shaped pipe 93 penetrates into the second recovery cylinder 9 and extends to the middle part of the second recovery cylinder 9, the other end of the second U-shaped pipe 93 penetrates into the second transfer box 92 and extends to the upper part of the second transfer box 92, and in addition, the U-shaped bent part of the second U-shaped pipe 93 penetrates into the upper part of the second recovery cylinder 9 and is not higher than the upper end of the second recovery cylinder 9;

the input end of the second pump 95 is communicated with the small-opening end of the second recovery cylinder 9 through a second pipeline and is used for outputting the solid-liquid mixture precipitated at the lower end of the second recovery cylinder 9;

a precipitate recovery tank 10 connected to output end pipes of the first pump 85 and the second pump 95, respectively, and configured to store the solid-liquid mixture conveyed by the first pump 85 and the second pump 95;

the bottom of the concave structure of the bracket 116 is provided with an arch part 1162 with an arc structure, and the side surfaces of the bottom of the concave structure of the bracket 116, which are close to the first recovery cylinder 8 and the second recovery cylinder 9, are respectively provided with a liquid guide groove 1161 in a corresponding inclined manner;

in addition, the first electric control valve 81, the second electric control valve 91, the first pump 85 and the second pump 95 are all connected with a controller and are controlled by the controller to open and close.

This scheme ingenious is through utilizing the siphon principle, sets up first n-shaped pipe 83 and second n-shaped pipe 93 and takes out the relatively limpid lubricated liquid pump of accumulating respectively in with first recovery section of thick bamboo 8 and the second recovery section of thick bamboo 9 and send to first transfer case 82 and second transfer case 92, and this mode need not to carry out the initiative with the help of external motor and drives, only relies on the liquid level height of linker principle to realize the opportunity that siphon power started, has realized the technological effect that the self-adaptation of liquid shifts between different containers.

Since the first transfer box 82 and the second transfer box 92 need to transfer the lubricating oil after storing a certain amount, so as to avoid exceeding the amount that can be stored, in the present scheme, as a preferred alternative embodiment, further, the lower portion of the first transfer box 82 is communicated with the lubricating medium container 4 through a third pipeline 891, and the end of the third pipeline 891 close to the first transfer box 82 is provided with a third electronic control valve 892, and the end of the third pipeline 891 close to the lubricating medium container 4 is provided with a third pump 89;

the lower part of the second transit box 92 is communicated with the lubricating medium container 4 through a fourth pipeline 991, a fourth electric control valve 992 is arranged at the end part of the fourth pipeline 991 close to the second transit box 92, and a fourth pump 99 is arranged at the end part of the fourth pipeline 991 close to the lubricating medium container 4;

the third electric control valve 892, the fourth electric control valve 992, the third pump 89 and the fourth pump 99 are all connected with the controller and are controlled by the controller to open and close.

In order to make the selection of the starting time of the third pump 89 and the fourth pump 99 more flexible and to make the siphon extraction height adjustment of the lubricating fluid in the first recovery cylinder 8 and the second recovery cylinder 9 more convenient, as a preferred embodiment, further, the end of the first n-shaped pipe 83 close to the first transfer box 82 in the present solution is provided with a first water flow sensor 88, and the first water flow sensor 88 is connected with the controller and is used for feeding back the liquid flowing state in the first n-shaped pipe 83;

the end of the second pipe 93 near the second transit box 92 is provided with a second water flow sensor 98, the second water flow sensor 98 being connected to the controller and being used for feeding back the state of the liquid flow inside the second pipe 93;

the first inverted U-shaped pipe 83 penetrates into the first transfer box 82, the outer side of the end part of the first inverted U-shaped pipe 83 is further slidably sleeved with a first sliding sleeve 84, a first sealing ring 841 is fixedly arranged between the first sliding sleeve 84 and the first inverted U-shaped pipe 83, the lower end of the first sliding sleeve 84 is connected with a first pull rod 86, the lower end of the first pull rod 86 extends downwards and penetrates through the first recovery cylinder 8, a first sealing element 87 is arranged at the penetrating position of the first pull rod 86 corresponding to the first recovery cylinder 8, and the first sliding sleeve 84 is driven to slide on the end part of the first inverted U-shaped pipe 83 by the lifting and pulling of the first pull rod 86;

the tip outside that second n-shaped pipe 93 penetrated in the second transfer case 92 still slides the cover and is equipped with second slip cap 94, fixedly between second slip cap 94 and the second n-shaped pipe 93 be provided with second sealing washer 941, the lower extreme of second slip cap 94 is connected with second pull rod 96, the lower extreme downwardly extending of second pull rod 96 just passes second recovery section of thick bamboo 9, and the position of wearing of second recovery section of thick bamboo 9 correspondence second pull rod 96 is equipped with second sealing member 97, it slides on the tip of second n-shaped pipe 93 to drive second slip cap 94 by the lift pulling of second pull rod 96.

This scheme ingeniously responds to the siphon of first U-shaped pipe 83 and second U-shaped pipe 93 through first water flow sensor 88 and second water flow sensor 89 and takes place the number of times, realize that the indirect lubricated liquid reserves in first transfer case 82 and the second transfer case 92 are estimated, simultaneously according to the siphon count number of times of settlement come trigger controller control corresponding third pump 89 or fourth pump 99 to work, in time carry the retrieval and utilization to lubricated medium container 4 with the lubricated liquid in first transfer case 82 and the second transfer case 92, and can further control first pump 85 simultaneously, the deposit of second pump 95 with first recovery section of thick bamboo 8 and second recovery section of thick bamboo 9 bottom is pumped to deposit collection box 10, with this realization to the interim cleanness of first recovery section of thick bamboo 8 and second recovery section of thick bamboo 9.

Based on the device, the scheme also provides a crane transmission mechanism fault monitoring method which comprises the crane transmission mechanism fault monitoring device, and the monitoring method comprises the following steps:

(1) the monitoring terminal establishes a monitoring database, and ultrasonic detection data of the transmission chain 3 under different health conditions and different transmission speeds are stored in the monitoring database;

(2) the crane is started, and the transmission chain 3 is driven by the driving force to operate in a transmission way;

(3) the controller controls the first oil pump 5, the second oil pump 7, the first air pump 6 and the ultrasonic flaw detection assembly 2 to start to work, so that lubricating oil is sprayed to the transmission chain 3 when the transmission chain enters a detection area, residual stains and dust on the surface of the transmission chain are washed, and the transmission chain 3 enters the detection area after being subjected to air injection treatment by the first air pump 6;

(4) the ultrasonic detection probe 21 of the ultrasonic flaw detection assembly 2 carries out ultrasonic detection on each chain link of the transmission chain 3 entering the detection area to obtain ultrasonic detection data, the ultrasonic detection data are transmitted to a monitoring terminal for detection and judgment, and when the ultrasonic detection data do not meet the preset requirements, the monitoring terminal outputs an early warning signal;

(5) the detected transmission chain 3 moves out of the detection area 24 along the transmission direction, and passes through the shaping mechanism 1 after secondary spraying of lubricating oil is carried out on the second oil pump 7;

(6) the first recycling cylinder 8 continuously receives the dripped lubricating liquid, when the lubricating liquid height exceeds the inverted U-shaped bending part of the first inverted U-shaped pipe 83, the lubricating liquid enters the first inverted U-shaped pipe 82 and forms siphon suction to suck the lubricating liquid with the liquid level higher than the lower end of the first sliding sleeve 84, so that the lubricating liquid is passively sucked into the first inverted U-shaped pipe 82, meanwhile, the first water flow sensor 88 senses the fluid flow in the first inverted U-shaped pipe 83 to generate a sensing signal, the sensing signal is transmitted to the controller, the controller counts, when the counting value reaches a preset value, the controller controls the third electric control valve 892 to be opened, and then controls the third pump 89 to be started, so that the lubricating liquid in the first inverted U-shaped pipe 82 is conveyed into the lubricating medium container 4; the second recovery cylinder 9 continuously receives the dripping lubricating liquid, when the lubricating liquid height exceeds the inverted U-shaped bending part of the second inverted U-shaped pipe 93, the lubricating liquid enters the second inverted U-shaped pipe 92 and forms siphon suction to suck the lubricating liquid with the liquid level higher than the lower end of the second sliding sleeve 94, so that the lubricating liquid is passively sucked into the second inverted U-shaped pipe 92, meanwhile, the second water flow sensor 98 senses the fluid flow in the second inverted U-shaped pipe 93 to generate a sensing signal, the sensing signal is transmitted to the controller, the controller counts, when the counting value reaches a preset value, the controller controls the fourth electric control valve 992 to be opened, and then controls the fourth pump 99 to be started, so that the lubricating liquid in the first inverted U-shaped pipe 82 is conveyed into the lubricating medium container 4; wherein, the third electric control valve 892, the fourth electric control valve 992, the third pump 89 and the fourth pump 99 are turned off after being turned on for a preset time;

(7) the controller controls the second electric control valve 91 and the third electric control valve 892 to open, and then controls the first pump 85 and the second pump 95 to start, so that solid-liquid mixtures at the lower parts of the first recovery cylinder 8 and the second recovery cylinder 9 are pumped to the precipitate recovery tank 10 by the first pump 85 and the second pump 95 respectively, wherein the first electric control valve 81, the second electric control valve 91, the first pump 85 and the second pump 95 are closed after the start-up reaches a preset duration.

The above method mainly explains the matching flow schematic diagram of the shaping mechanism 1 and the ultrasonic flaw detection assembly 2, and the specific method for processing the ultrasonic detection data by the remote terminal is as follows:

as shown in fig. 7, a drive train monitoring method for damage monitoring of a drive train includes:

s01, constructing a monitoring database;

s02, acquiring the transmission speed of the transmission chain in real time;

s03, carrying out vibration suppression on the transmission chain in a non-motion interference area in the transmission chain operation, and then carrying out ultrasonic detection on each chain link to generate ultrasonic detection data;

s04, judging the ultrasonic detection data according to preset conditions to generate a judgment result;

s05, obtaining the judgment result and identifying the judgment result,

when the judgment result is normal, storing the ultrasonic detection data in a monitoring database;

and when the judgment result is abnormal, generating and outputting early warning information, and storing the early warning information and the ultrasonic detection data in a monitoring database.

In the scheme S01, a reference data set is further stored in the monitoring database, and the reference data set is ultrasonic feedback waveform data of the transmission chain at different transmission speeds when the transmission chain is free from abnormal damage;

s04 includes acquiring ultrasonic detection data, leading the ultrasonic detection data into a detection neural network for detection, and outputting a judgment result by the detection neural network;

and the detection neural network is obtained after the reference data set is imported into the neural network and trained to be converged.

Specifically, in S01, the reference data set is obtained by:

s011, numbering each chain link of the transmission chain, detecting ultrasonic detection data in a standing state of the transmission chain, and associating the ultrasonic detection data with the chain links with corresponding numbers to obtain a static data set;

s012, driving the transmission chain to drive at least 3 circles at a constant speed at a preset speed, simultaneously acquiring ultrasonic detection data of the transmission chain in a motion state in real time, changing the driving speed of the transmission chain according to a preset speed interval, continuously acquiring the ultrasonic detection data after the speed is adjusted, finally separating the acquired ultrasonic detection data, and associating the separated ultrasonic detection data with the chain links with corresponding numbers to acquire a dynamic data set;

s013, carrying out mean value processing on ultrasonic detection data corresponding to each link in the dynamic data set at the same speed to generate reference ultrasonic detection data;

s014, setting up-down floating error values of ultrasonic detection data corresponding to each chain link in the static data set, and then generating the ultrasonic detection data in the floating error values to obtain a first data set;

s015, setting up an up-down floating error value for ultrasonic detection data corresponding to each chain link in the static data set, and then generating ultrasonic detection data positioned in the floating error value to obtain a second data set;

s016, merging the first data set and the second data set to obtain a reference data set;

in S011, the taken transmission chains comprise a transmission chain which is not normally used and a transmission chain with abnormal chain links, the abnormal conditions of each chain link in the transmission chain with abnormal chain links are different, and the abnormal conditions of the corresponding chain links are recorded in advance when the abnormal conditions are numbered.

The ultrasonic detection data acquisition of different transmission conditions is carried out on the normal transmission chain and the abnormal transmission chain to be used as a training material of the neural network, so that the detection precision and the result reliability of the neural network can be improved.

In this solution S04, the training method for detecting a neural network includes: taking the ultrasonic detection data in the first data set and the second data set and the corresponding transmission speed as input items, taking the link health condition as the marking information of the input items, introducing the input items and the marking information into a neural network, and then training the neural network until the model converges to obtain a detected neural network;

s02 further includes: and recording the duration of the transmission chain at different transmission speeds, then obtaining the transmission stroke of the transmission chain in single continuous use according to the duration and corresponding transmission speed statistics, uploading the transmission stroke to a monitoring database according to preset conditions, and adding the transmission stroke by the monitoring database to obtain the accumulated use stroke of the transmission chain.

In this embodiment, as a preferred implementation choice, it is preferable that in S05, when the determination result is normal, the ultrasonic detection data is stored in the monitoring database, and then the cumulative use stroke of the transmission chain is associated with the ultrasonic detection data;

when the judgment result is abnormal, matching the ultrasonic detection data with the ultrasonic detection data corresponding to the abnormal chain link in the reference data set, packaging the ultrasonic detection data corresponding to the abnormal chain link with the highest matching degree and the chain link abnormal condition corresponding to the abnormal chain link with the real-time detection ultrasonic detection data, generating and outputting early warning information, and storing the early warning information and the ultrasonic detection data in a monitoring database;

wherein, the ultrasonic detection data are output in the form of oscillogram.

Since the original training data is mostly fixed, in the foregoing solution, the detection accuracy of the neural network has certain limitations, and in order to further adapt the neural network to different application scenarios and drive chain situations, as a preferred implementation choice, S04 further includes: setting the first data set and the second data set as original data sets;

s05 further includes: after the ultrasonic detection data with the normal judgment result and the abnormal judgment result are stored in the monitoring database, the judgment result is also related to the ultrasonic detection data, and then the ultrasonic detection data is set as an adjusting and optimizing data set;

the monitoring method further comprises the following steps:

and S06, leading the tuning data set into the neural network for tuning training according to a preset time frequency until the model converges, then leading the original data set into the neural network for tuning verification, finishing the tuning training when the tuning verification result meets the preset requirement, if the tuning verification result does not meet the preset requirement, continuing leading the tuning data set into the neural network for tuning training until the model converges and the tuning verification result meets the preset requirement, and finishing the tuning training.

As a preferred implementation option, preferably, S06 further includes: and (4) leading the tuning data set into the detection neural network and shifting out the tuning data set of which the tuning training is finished, and marking the tuning data set as trained monitoring data.

According to the scheme, S06 for data feedback training is further added on the basis of the technologies from S01 to S05, and the transmission chain ultrasonic detection data obtained in real time are used as optimized training materials, so that the accuracy and precision of the detection of the neural network are further optimized, and the neural network is more suitable for actual use scenes.

In the case of the above-mentioned technical solutions of S01-S06, as an implementation of the apparatus of this embodiment shown in fig. 1, the method specifically includes:

the shaping unit is used for inhibiting the vibration of the transmission chain in a non-motion interference area in the transmission chain operation;

the ultrasonic flaw detection assembly is used for carrying out ultrasonic real-time detection on each chain link of the transmission chain subjected to shaping treatment by the shaping unit to generate ultrasonic detection data;

monitor terminal, it includes:

the background server is used for constructing a monitoring database;

the speed monitoring unit is used for acquiring the transmission speed of the transmission chain in real time;

the data processing unit is used for judging the ultrasonic detection data according to preset conditions and generating a judgment result;

and the data scheduling unit is used for acquiring and identifying the judgment result, outputting the early warning information according to a preset requirement and/or storing the ultrasonic detection data in a monitoring database.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be substantially or partially implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The foregoing is directed to embodiments of the present invention, and equivalents, modifications, substitutions and variations such as will occur to those skilled in the art, which fall within the scope and spirit of the appended claims.

Claims

1. Crane drive mechanism fault monitoring device for the drive chain fault monitoring of hoist, its characterized in that: it includes:

2. The crane transmission fault monitoring device of claim 1, wherein: the plastic mechanism includes:

3. The crane transmission fault monitoring device of claim 2, wherein: the device further comprises: a lubricating medium container for storing lubricating oil;

4. The crane transmission fault monitoring device as claimed in claim 3, wherein: the ultrasonic inspection assembly includes:

5. The crane transmission fault monitoring device as claimed in claim 4, wherein: the holding cavity is provided with a bracket corresponding to the ultrasonic flaw detection assembly, the bracket is of a concave structure, and the edge of the upper end face of the concave structure is in arc transition.

6. The crane transmission fault monitoring device of claim 5, wherein: the device further comprises:

7. The crane transmission fault monitoring device as claimed in claim 6, wherein: the device further comprises:

8. The crane transmission fault monitoring device of claim 7, wherein: the lower part of the first transfer box is communicated with a lubricating medium container through a third pipeline, a third electric control valve is arranged at the end part of the third pipeline close to the first transfer box, and a third pump is arranged at the end part of the third pipeline close to the lubricating medium container;

9. The crane transmission fault monitoring device of claim 8, wherein: the end part of the first inverted U-shaped pipe, which is close to the first transfer box, is provided with a first water flow sensor, and the first water flow sensor is connected with the controller and is used for feeding back the flowing state of the liquid in the first inverted U-shaped pipe;

10. A fault monitoring method for a transmission mechanism of a crane is characterized by comprising the following steps: the crane transmission mechanism fault monitoring device comprises the crane transmission mechanism fault monitoring device as claimed in claim 9, and the monitoring method comprises the following steps: