114results about How to "Ensure safe delivery" patented technology

The invention discloses a digital copyright protection method and a system. The method comprises the following steps: performing pretreatment on the original digital content provided by a content supplier before distribution and operation; conducting management of copyright constraints on the pretreated digital content through a mode of an authorized license; accessing and using the digital content containing the copyright constraints via a terminal in accordance with corresponding right constraints, and sending supervision records formed by the usage and the access to a credible third-party supervision server; and managing the supervision records which are formed by accessing and using the digital content containing the copyright constraints via the terminal with the credible third-party supervision server. The invention realizes balance constraints of all roles in a value chain of the digital content, which are required by the digital copyright protection system, so as to truly protect legitimate rights of a digital content copyright holder.

The invention relates to the field of coal mine safety, in particular to an intelligent regulation and control system for safe coal bed gas gathering and transportation in a coal mine area. The intelligent regulation and control system comprises a monitoring host, an audible and visual alarm, a plurality of monitoring substations, a plurality of groups of sensors and negative pressure regulation devices, wherein the plurality of monitoring substations are arranged in a coal bed gas gathering and transportation pipe network in the coal mine area in a distributed way; the plurality of groups of sensors and the negative pressure regulation devices are arranged in a pipeline of the coal bed gas gathering and transportation pipe network at intervals; each monitoring substation receives monitoring data in the pipeline, acquired by at least one group of sensors, and transmits the monitoring data to the monitoring host; the monitoring host analyzes and judges whether the coal bed gas gathering and transportation pipe network is abnormal according to the monitoring data transmitted from each monitoring substation; when leakage or blockage exists in the pipeline, an audible and visual alarm signal is emitted; and when the pipeline is broken, the pipeline at the abnormal area is closed by the negative pressure regulation devices. By means of the intelligent regulation and control system, the coal bed gas gathering and transportation pipe network can be monitored in real time, the fault situation of the coal bed gas gathering and transportation pipe network can be judged according to the monitoring result, and corresponding operations can be carried out, therefore the safety transportation of the coal bed gas under a mine shaft of the coal mine area can be ensured.

The invention discloses an express sending and receiving device and method. The device comprises one or multiple storage cells for storing to-be-sent or to-be-received packages, each storage cell is provided with an opening and closing door with a door lock, and each door lock comprises a common key or an electronic key. A courier carries an electronic medium or inputs electronic passwords at an input terminal, one or multiple ways are adopted to activate door opening signals, communication with a network server is realized through a communication module of the express sending and receiving device, the network server or the express sending and receiving device automatically compares or verifies the electronic passwords or electronic medium information, and unlocking of the opening and closing doors of the express sending and receiving device can be realized to get articles in the express sending and receiving device when information comparison or verification succeeds. By the express sending and receiving device and method, time of the courier for communicating with a user and waiting time of the courier in express sending and receiving activities are saved, express sending and receiving efficiency of express industry is improved, and safe express delivery is ensured.

The invention discloses a carton opening machine. The carton opening machine comprises a rack (1), a carton storage mechanism (2), a carton taking mechanism (3), a carton falling platform (4), a carton forming mechanism (5), a front-rear cover forming mechanism (6), a left-right cover forming mechanism (7), a left-right cover guiding rod (8) and a gluing machine (9), wherein the rack (1) is internally provided with a group of parallel corresponding vertical chains (10) which are meshed on a chain wheel (11) driven by a servo motor; the vertical chains (10) are connected by carton pushing rods (12) which are uniformly distributed; the carton storage mechanism (2) and the carton taking mechanism (3) are positioned above one end of each vertical chain (10); the carton falling platform (4), the carton forming mechanism (5), the front-rear cover forming mechanism (6), the left-right cover forming mechanism (7), the left-right cover guiding rod (8) and the gluing machine (9) are positioned among the vertical chains (10). The carton opening machine disclosed by the invention has the advantages of simple structure, high operating efficiency and low cost.

The invention discloses a multifunctional food safety distribution device which comprises a base and a distribution box. A groove is formed in the base; the distribution box is arranged in the groove; L-shaped limiting plates are symmetrically arranged on the two sides of the bottom of the distribution box; a plurality of mounting grooves are uniformly formed in the lower ends of the L-shaped limiting plates, and rolling balls are arranged in the mounting grooves correspondingly; a plurality of first telescopic rods are connected between the outer walls of the L-shaped limiting plates and the inner wall of the base, and the outer walls of the first telescopic rods are sleeved with first springs; a cold storage area and a heating area are arranged in the distribution box; pull rods are arranged in the cold storage area and the heating area correspondingly, and the bottoms of the pull rods are fixedly connected with bottom plates; and a plurality of food boxes are symmetrically arranged on the two sides of the outer walls of the pull rods. Operation is easy, using is convenient, quick and ingenious, the condition of scattering of foods in the distribution process can be effectively avoided, the distribution box is provided with a temperature control system which can control the temperature in the box in real time, the effects of cold storage and heat preservation are achieved, the safety of the foods is guaranteed, and the multifunctional food safety distribution device is suitable for wide promotion.

The invention discloses a safety logistics transportation interaction method, and relates to the field of logistics management. The method comprises the steps: client information labeling, vehicle information matching, vehicle cargo information matching, distribution path analysis, client inquiry, and double-side mutual evaluation. The method takes a logistics data processing center as a medium, forms the effective interaction between a customer and a vehicle owner, achieves the automation and intelligentation, guarantees the rights and interests of the customer through the information matching of the vehicle owner and the cargos of the customer, clearly divides the attribution of liability, provides real-time GPS information when a vehicle is in a transportation process, guarantees the safety distribution of cargos, effectively improves the safety and timeliness of logistics distribution, is suitable for a modern society with the rapid developing economy, and is worthy of popularization.

The invention discloses a treasure box article feeding and taking system and a treasure box article feeding and taking method based on a treasure box cabinet. The system comprises treasure boxes, a server and the treasure box cabinet, wherein the treasure boxes and the server communicate through a network; the treasure box cabinet and the server communicate through the network; the treasure boxes are used for storing express articles; the treasure box cabinet is used for storing the treasure boxes; the server is used for controlling the opening of the treasure boxes. When the treasure box article feeding and taking system disclosed by the invention is used for feeding and taking the articles, a sender carries one treasure box for feeding articles, and a recipient can take away the express articles in the treasure box and the treasure box, so that the recipient can take away all the express articles, and the express articles are prevented from being lost; during carrying, greater convenience is realized.

The invention provides a security prompting method for a crowded place. The method firstly sets a broadcast area, a management platform of the mobile service provider calculates the broadcast area andlocks a corresponding base station, and the base station broadcasts to users in the broadcast area as required for notifying and sending security alerts. In the crowded areas such as scenic spots, large-scale event gathering places, group activities, concerts, marathons and cultural fairs, the security prompting method utilizes existing mobile phones to cover users, push the information such as warm reminder, road guiding and abnormal traffic flow around before the event to the personnel entering the area, and give targeted unblocked route advices, care text messages and the like, thereby providing people with safety warnings.

The invention discloses a treasure box mailing system and method. The mailing system comprises a client, a treasure box and a server, the client and the treasure box communicate with the server via the network, the server comprises a user module, a mail inspection module, a mail sending module, a mail taking module and a database, and the treasure box comprises a safety check module, an audio and video module and a treasure box database. The mailing method comprises a treasure box booking step, a mail sending step and a mail taking step, and remote inspection is needed when a mail is sent. According to the invention, onsite inspection is not needed when the fast mail is sent, convenience is provided for senders, and the workload of delivery staff is reduced at the same time.

The invention discloses a telescopic trestle system and a control method thereof. The telescopic trestle system is mounted on a support platform or a support ship and comprises a cylinder body arranged on the support platform or the support ship, a rotary chassis is connected to the cylinder body through a rotary mechanism, a hydraulic pump station and a cab are arranged on the rotary chassis, a trestle fixing section is connected to the rotary chassis, the hydraulic pump station is connected with the trestle fixing section through a variable-amplitude mechanism, the front end of the trestle fixing section is connected with a trestle moving section through a telescopic mechanism, and a landing device and an inclined ladder are arranged on the front end of the trestle moving section. The telescopic trestle system further comprises a motion compensation control system, and the motion compensation control system comprises a filter module and a controller module. According to the telescopic trestle system and the control method thereof, the safety conveying problem of personnel under the offshore severe sea condition is solved, and conveying of electricity, water, oil and mud can be provided.

The invention provides a method solving air preheater dust clogging problems and an intelligent online flushing system; a washing device of the system penetrates a flue gas wall on a flue gas side of the air preheater; a washing gun of the washing device is arranged on a flue gas exit side of the rotary air preheater, i.e., on the bottom of the air preheater, and a nozzle faces upwards; when a heat storage element of the rotary air preheater on a heat-engine plant coal dust boiler flue path is blocked, and import and export operation differential pressure on the glue gas side reaches 1.2-1.3 times of a designed pressure, the high pressure washing system is started, high pressure water is sprayed out from the nozzle of the washing gun of the washing device, and high pressure jet is sprayed out to wash the heat storage element from the bottom of rotating air preheater to an upper side. The high pressure small flow washing mode can fast wash off the ash deposit from the air preheater, thus greatly reducing ventilation resistance of a flue gas heat exchanger, reducing air leak rate, improving heat exchange efficiency of the air preheater, and greatly reducing boiler energy consumption.

The invention is applicable to the field of security of system information of the Internet of things (IoT), and provides an IoT access method and an IoT access system of terminal equipment. The method comprises the steps of reading first sensing information of a RFID label, calling a group of random numbers to serve as a signature key, and encrypting the signature key to acquire a first ciphertext; calling the identifier of the RFID label, and sending the identifier of the RFID label and the first ciphertext to an IoT system authentication center; encrypting the first sensing information to acquire a second ciphertext and generating a digital signature of the first sensing information; and sending the second ciphertext and the digital signature to the IoT system authentication center. According to the method and the system provided by the embodiment of the invention, a RFID card reader encrypts information to be sent for two times, and security transmission of the information is ensured; the digital signature of the first sensing information is generated, subsequent verification on the digital signature is facilitated, and security of the information received by the IoT system authentication center is further ensured.

The invention belongs to the field of cloud computing resource management. The invention relates to a sandbox management system based on OpenStack. According to the cloud platform safety initialization method provided by the invention, safety initialization and safety delivery of various test sandboxes in a big data test field are realized by adding a trusted third party, so that the initial control right of the sandboxes is safely transferred to the trusted third party from a platform operator, and integrity verification of the sandboxes is realized. The method has the advantages that in thetraditional cloud service providing process, the trusted third-party platform independent of the cloud service provider is added, and the safety and fairness of the whole cloud service renting processare improved. By separating mirror image making and deployment from a management cluster and comparing a mirror image ID recorded by a trusted third party with a mirror image ID to be registered by acloud service provider, it is ensured that a mirror image file is not tampered and other functions are not added; by adding the initialization module and the integrity check module, safety initialization, safety delivery and later corresponding account management and authority management of the sandbox are guaranteed, and the sandbox cloud service behavior guarantee method is a cloud service behavior guarantee scheme supporting privacy protection.

The invention discloses a treasure box, a drop and pick up system and a method thereof, and a query and positioning method of the treasure box. The treasure box is provided with a biological identification module, a close-range module and a positioning module. Through the biological identification module and the close-range module, identification verification modes of the treasure box are increased and are not limited in password identification. The box can be opened conveniently. Simultaneously, state information of the treasure box can be known at any time and can be traced.

The invention relates to a communication system based on M-LVDS real-time multi-homed high-speed buses. The communication system comprises a system A, a system B, and a M-LVDS bus, wherein each of thesystem A and the system B comprises a plurality of nodes, the nodes in the system A or the system B are interconnected through a backboard or PCB cabling; the nodes between the system A and the system B are interconnected through the M-LVDS bus. Compared with the prior art, the communication system disclosed by the invention has the advantages of being high speed, real-time, isolated and flexiblein networking.

The invention relates to a stirring transport tank which comprises a tank body, wherein the tank body is provided with a baffle plate and a stirrer, the stirrer comprises a driving system and a stirring system connected with the driving system, a sealing device is arranged between a chain gear transmission box of the driving system and the transport tank, the stirring system comprises a stirring shaft which is engaged with a bearing sleeve and is provided with stirring impellers, the stirring impellers are in a single shaft mode, the bearing sleeve is arranged on support frames arranged in the transport tank, the support frames are arranged corresponding to the bearing sleeve, are arranged on the side wall and the bottom of the transport tank and are fixedly connected with the internal wall of the transport tank, a driving chain of the driving system is connected with both ends of the stirring shaft of the stirring system, the stirring shaft is divided into at least two parts, the two parts of the stirring shaft have asynchronous rotating speed, and the driving system is connected with a power system of a cart body and a backup power supply. The invention has a reasonable structure, overcomes the defects of the prior art because the stirrer is arranged in the tank, can reduce sediments by about 90 percent, and relieves the labor intensity of a worker cleaning the tank.

The invention discloses a multi-level storage and recovery method and system of a journal file in a cloud environment, and belongs to the field of communication applications of computer networks. The multi-level storage and recovery method of the journal file in the cloud environment comprises three levels, namely rapid storage and recovery, ordinary storage and recovery and complete storage and recovery, and a journal level management module determines the storage and recovery level of the journal file according to user levels and configuration requirements and executes corresponding steps. The multi-level storage and recovery system of the journal file in the cloud environment comprises the journal level management module, a general encryption / decryption module, a stored journal management module, a JMS message management module and a database management module which are contained in the same Gatekeeper. The multi-level storage and recovery method and system of the journal file in the cloud environment make full use the characteristics of an internal storage, a JMS message and a database, realize various storage and recovery modes of the journal file in the cloud environment, such as the rapid storage and recovery mode, the ordinary storage and recovery mode and the complete storage and recovery mode, avoid space waste, reduce data redundancy, further improve the storage and recovery efficiency, and realize classified recovery and ranking of journals.

The invention discloses a tamper-proof covert communication method and system based on a block chain as well as a platform. The method comprises the following steps: acquiring to-be-sent secret information; adding the secret information into a bit coin transaction by utilizing an OP_Reurn script, so that a new bit coin transaction containing the secret information is formed; broadcasting a signednew bit coin transaction into a block chain system, and storing in a transaction pool; running a block chain mining program, performing a mining operation on the new bit coin transaction in the transaction pool, and packaging and forming a transaction block; by virtue of a POW consensus protocol, saving the transaction block on a block chain; and viewing the transaction block on the block chain, and extracting the secret information. By applying the method disclosed by the invention, external data attached and hidden by utilizing an OP_RETURN script of the block chain is subjected to mining confirmation and then is added into the block chain, thereby guaranteeing that information can not be tampered, realizing integrity and availability of transmitted secret information and guaranteeing safe transmission of the information.

The invention discloses an automatic guided vehicle (AGV) forklift type intelligent carrying robot. The AGV forklift type intelligent carrying robot comprises a sweep template and a control room, thecontrol room is arranged at one end of the top of the sweep template, two supporting columns are arranged on the sweep template of one side of the control room, and the two supporting columns are perpendicular to the top surface of the sweep template. A stiffening plate is arranged at the bottom position between the two supporting columns, a sucking cup is controlled to move to the top surface ofa cargo, when the sucking cup is in contact with the top surface of the cargo, two second internal piston rods are controlled to move downwards correspondingly through two second hydraulic cylinders,the two second piston rods push the bottom sucking cup to move downwards, so that the sucking cup is tightly close to the top surface of the cargo, when the sucking cup is stressed, a moving plate moves upwards along a sliding rail, a spring is compressed to reduce pressure to the sucking cup, so that the cargo is fixed, the risk of cargo falling off during forklift moving is avoided, cargo delivery safety is ensured, the sucking cup is prevented from being damaged due to excessive stress, and the service life of the sucking cup is prolonged.

The invention discloses a metal belt-type stepless transmission target clamping force calculation method based on reserved clamping force. The method comprises the steps that according to formulas, the minimum target clamping force F<pri> of a driving belt wheel and the minimum target clamping force F<sec> of a driven belt wheel are calculated; and then according to the current target speed ratioand the corresponding clamping force ratio, the driven belt wheel target clamping force F<sec_KPKS> corresponding to the driving belt wheel and the driving belt wheel target clamping force F<pri_KPKS>corresponding to the driven belt wheel are calculated.

The invention discloses a high-speed conveying system of a high-speed precise paper cutting machine. The high-speed conveying system comprises a paper receiving trolley, a broke door device, a broke conveying device, a conveying platform, a regulation roller, a high-speed belt device, a compression roller, a driving device, traction rollers and a whole rack, wherein the paper receiving trolley is positioned behind a transection system of the paper cutting machine and is installed between the left side plate and the right side plate of the whole rack; the broke door device is positioned behind the paper receiving trolley and is installed between the left side plate and the right side plate of the whole rack; the conveying platform is installed behind the broke door device; the broke conveying device is installed below the broke door device and the conveying platform; the regulation roller is arranged above the conveying platform; the high-speed belt device is positioned behind the conveying platform; the compression roller is tightly attached to the upper surface of the high-speed belt device; the driving device is positioned below the paper receiving trolley; a plurality of traction rollers are arranged and are installed between the left side plate and the right side plate of the whole rack through a mounted bearing. The high-speed conveying system has a tight structure, conveying space is greatly saved, manufacture cost is lowered, and paper webs with different thicknesses are guaranteed to be successfully conveyed.

The invention discloses an internal packaging box special for poultry egg expressage. According to the internal packaging box special for poultry egg expressage, an egg supporting base is arranged at the inner bottom end of a box body, and a plurality of egg pits are formed in the egg supporting base; a partition plate is arranged between every two adjacent egg pits, and air holes are formed in the upper portions of the partition plates; supporting pillars are arranged in the box body, and air inlet holes are formed in the two sides of the egg supporting base; and a box cover is arranged at the upper end of the box body, and poultry egg positioning grooves corresponding to the egg pits are formed in the lower portion of the box cover. When the internal packaging box special for poultry egg expressage is in use, poultry eggs are placed into the egg pits, the box body is covered with the box cover, and the box body and box cover are bonded with adhesive tape; the poultry eggs in the egg pits are not prone to swinging or leaking egg yolk or being damaged due to fixation of cushions and the positioning grooves of the box cover; and due to the air inlet holes in the two sides of the egg supporting base and the air holes in the upper portions of the partition plates, the poultry eggs are not prone to go bad due to an air lack. The internal packaging box special for poultry egg expressage is simple in structure; and because the box is made of polystyrene resin in an extrusion manner, the box is light, low in cost and convenient to use.

This invention discloses a direct bank financial service system and a method. Said system includes: a user system host, a wire network transmission system, a customer server and a cipher code check device, among which, said terminal is connected with the financial applied server via the wire transmission network used in ciphering and de-ciphering the sent and received information, the wire transmission network and the financial applied server, said server and said terminal are connected with the ciphered code check device via the wire transmission network for controlling and processing information from the ciphered code check device. Advantage: the bank network is fully utilized to provide more safety and convenient fund transfer service to other financial units and companies and deal with direct service with the bank via special lines and ensure safely transfer of information.

The invention provides an automatic inspection system for an unmanned aerial vehicle, and relates to the technical field of water conservancy detection. The automatic inspection system comprises the unmanned aerial vehicle, a control center and an imaging device carried on the unmanned aerial vehicle, and the unmanned aerial vehicle flies on a path preset by the control center. The automatic inspection system is characterized in that the unmanned aerial vehicle is provided with a communication device, a data storage device, a positioning device, a parachute and a pop-up device, wherein data of the imaging device and the positioning device is stored in the data storage device which is fixedly connected with the communication device and communicated with the control center through the communication device; the positioning device controls the pop-up device to be ejected, the pop-up end of the pop-up device stretches out of the surface of the unmanned aerial vehicle, the data storage device and the communication device are hidden in the pop-up end of the pop-up device, and the parachute is tied to the data storage device; when the positioning device detects that the unmanned aerial vehicle does not fly on the preset path, the pop-up device ejects the data storage device and the communication device. Compared with the prior art, the automatic inspection system for the unmanned aerial vehicle has the advantages that safe data transmission is guaranteed, and the data transmission rate is increased.

The invention discloses a non-inductive series connection device based on the virtual IP. The non-inductive series connection device is used for being connected with a signaling network safety protection device to be connected in series and is connected with the signaling network safety protection device through a standard IP stack. The non-inductive series connection device comprises a front board plug, a rear board plug and a processing unit, wherein the front board plug is connected with the rear board plug through a back plate bus, and the processing unit is in communication connection with the front board plug; in the working process, a virtual address layer conducts source address analysis and recording operation and target address analysis and recording operation on information of data inputted by an internet access A and / or an internet access B, and therefore the data can pass through an SC. It is ensured that the safety protection device can not affect the normal network service even under the condition of equipment faults, and hidden access and hidden quit of the device are achieved. When the non-inductive series connection device is obtained, the related safety protection device can complete the service operation such as detection, cutting, blocking and filtering of abnormal signaling under the hidden condition, and safe delivery of mobile communication network signaling information is ensured.

The invention discloses a monitoring system based on an unmanned aerial vehicle, and relates to the technical field of water conservancy detection. The monitoring system comprises the unmanned aerial vehicle, a control center and an image sampling device carried on the unmanned aerial vehicle; the image sampling device sends collected data information to the control center; the unmanned aerial vehicle is provided with a communication device, a data storage device, a detection device, a parachute and a popup device, data of the image sampling device and data of the detection device are stored in the data storage device, and the data storage device is fixedly connected with the communication device and communicated with the control center through the communication device; the detection device controls the popup device to pop up, the popup end of the popup device stretches out of the surface of the unmanned aerial vehicle, the data storage device and the communication device are hidden in the popup end of the popup device, and the parachute is bound to the data storage device; when the detection device detects that the unmanned aerial vehicle is out of control, the data storage device and the communication device pop up from the popup device. Compared with the prior art, the monitoring system has the advantages that safe data transmission is guaranteed, and the data transmission rate is increased.

The invention relates to an ultralow temperature loading arm structure with an anti-overflowing pipeline. The ultralow temperature loading arm structure comprises an upper rope wheel and outer arm supporting assembly, a trunnion box, an upright post and a nitrogen purging device, wherein the upper rope wheel and outer arm supporting assembly and the nitrogen purging device are respectively arranged at the upper end and the lower end of the upright post; a process pipeline extending outwards is positioned at the central position of the upper rope wheel and outer arm supporting assembly in a connecting manner, and a three-dimensional joint is arranged at the outer end of the process pipeline; meanwhile, an inner arm driving mechanism is arranged on the middle section of the upright post, an outer arm driving mechanism is arranged at the lower part of the upright post, a horizontal driving mechanism is arranged between the inner am driving mechanism and the outer arm driving mechanism, and an electric hydraulic control unit is arranged at the bottom of the upright post. The ultralow temperature loading arm structure has the beneficial effects that electric hydraulic control of global and local mechanisms can be realized; the operation flexibility of inner and outer arms is improved; meanwhile, the ultralow temperature loading arm structure is provided with the nitrogen purging mechanism, so that the problem that the deformation of sealing surfaces is non-uniform under a low temperature is effectively solved.

The invention provides an optical fiber electric heat tape and relates to an electric heat tape, and the optical fiber electric heat tape can be used for solving the problem that the fault point of a very long electric heat tape is difficult to accurately judge. The optical fiber electric heat tape comprises an electric heat tap body, an optical fiber (5), an inner sheath (2), a shielding layer (3) and an outer sheath (4), wherein the optical fiber (5) is arranged along the length direction of the electric heat tape body (1) and props against the electric heat tape body (1); the inner sheath (2), the shielding layer (3) and the outer sheath (4) are sequentially coated on the outer walls of the electric heat tape body (1) and the optical fiber (5) from inside to outside; once a certain point on the electric heat tape has a fault, the optical fiber can monitor the temperature change of the point in real time, and the change of reflected signal receiving time can accurately report the position of the fault point, so that maintenance can be organized quickly and conveniently, and the electric heat tape is restored to normal operation within minimum duration. The optical fiber electric heat tape can be used for heating conveying pipelines and storage tanks in the industries of buildings, steel, power and the like.

The invention discloses a crane tube conveying fluid matter into a tank body, relating to a crane tube which can automatically close a valve on a conveying pipeline and cut off a fluid channel when the tank body is full of fluid and is provided with an overflow preventing system. The crane tube consists of a pressure on-off valve, a crane tube, an oil inlet pipe for an upper-cavity, an oil outlet pipe for the upper-cavity, as well as a manual regulating valve, wherein the oil inlet pipe for the upper-cavity communicates a lower cavity of the pressure on-off valve with an upper cavity of the pressure on-off valve, the oil outlet pipe for the upper-cavity communicates the upper cavity of the pressure on-off valve with an oil outlet of the pressure on-off valve, and the manual regulating valve is arranged on the upper-cavity oil outlet pipe. The oil outlet pipe for the upper-cavity is in parallel connection with an oil outlet shunt tube for the upper-cavity parallel to the crane tube; and a buoyancy on-off valve controlling the oil outlet shunt tube for the upper-cavity is vertically fixed on an oil outlet segment of the crane tube. With the overflow preventing system, the crane tube can effectively prevent overflow phenomena when the tank body is full of the fluid, guarantee the safe conveying of various fluids and eliminate potential safety trouble.