77results about How to "Meet the needs of the actual situation" patented technology

The invention relates to a multiple-laser radar raster map merging system based on a pilotless automobile. The multiple-laser radar raster map merging system based on the pilotless automobile comprises a one-line laser radar and a four-line laser radar, the two of which are mounted in front of the pilotless automobile, an eight-line laser radar mounted at the roof of the automobile, and a one-line laser radar mounted at the tail of the automobile; the laser radars are connected with a first industrial personal computer by use of a switch and by virtue of Ethernet; the data of the laser radar are transmitted to the first industrial personal computer by use of the switch and by virtue of the Ethernet, and the first industrial personal computer is used for analyzing and preprocessing the data; data are processed for different laser radars, respectively, and rasterization coding is performed on valid data and the coded values are transmitted to the first industrial personal computer in charge of data fusion by virtue of the Ethernet; next, data fusion is carried out by use of a raster map merging method and the rasterization coding is performed on the data, and finally, the coded values are transmitted to a second industrial personal computer by virtue of the Ethernet. The multiple-laser radar raster map merging system is used for solving the problem that the pilotless automobile and an assistant-driving automobile collide with a barrier, and therefore, the safety of the automobile in the driving process is improved.

The invention provides a pseudo-correlation feedback model information retrieval method and system based on semantic similarity. The method comprises the following steps: carrying out a first query from a target document set according to a query keyword to extract a pseudo-related document set, carrying out query expansion by adopting a Rochio algorithm, carrying out query expansion according to the semantic similarity of sentences, fusing the results of the two query expansion methods, and carrying out a second query to realize final information retrieval. According to the invention, when theextended lexical item is selected; the importance degree relationship between the query lexical item and the extension word in the traditional method can be highlighted; the semantic correlation of the sentences where the lexical items are located is combined; the condition that lexical items are associated when sentence semantics are similar in reality is met; According to the method and the device, the conditions that the semantics are related even if the lexical items are different are represented, so that the query words have better regional indexing in a multi-semantic environment, a large amount of useless and irrelevant information can be removed from mass information, more accurate candidate words can be obtained, and the precision of expanded query and final retrieval can be improved.

The invention provides a pseudo-correlation feedback model information retrieval method based on BERT. The method comprises: in the first round of retrieval of pseudo-correlation feedback, evaluatinga target document set D through a BM25 model, screening out a document set D', evaluating documents in the document set D' again through a BERT model, and obtaining BERT scores of the documents; linearly fusing the document scores obtained through the BM25 retrieval model and the BERT model to obtain a pseudo-correlation document set D1; performing query expansion based on the pseudo-correlation document set D1 to select candidate expansion words, and optimizing the candidate expansion words through BERT sentence semantic similarity to obtain final expansion words; and combining the final extension word with the original query Q to generate a new query keyword set, and performing a second round of retrieval on the target document set D by using the BM25 model to obtain a final retrieval result. According to the method, a large amount of useless and irrelevant information can be removed from massive information, more accurate candidate words are obtained, and the precision of extended query and final retrieval is improved.

The invention relates to a pressure container with heat insulation measures, in particular to a welded adiabatic gas cylinder which comprises a cylinder body, a valve base, a safety valve, a rupture disk, a pressure gauge, a liquidometer and a connection pipe. The cylinder body consists of an inner tank and a housing; a vacuum interlayer is formed between the inner tank and the housing; an insulating layer is arranged in the vacuum interlayer; a supporting system and an inner evaporator are also arranged on the welded adiabatic gas cylinder; the supporting system is arranged in the vacuum interlayer and connected with the inner tank; the insulating layer is a structure of more than two layers of insulated packing layers, and the inner evaporator is arranged in the vacuum interlayer and provided with a degasser layer attached on the inner tank or attached on the housing. The welded adiabatic gas cylinder has the advantages of low heat leakage, good low-temperature insulating effect, excellent supporting strength, convenience for use, high loading rate, security and reliability, high purity of stored gas, high vacuum degree, long vacuum service life and the like and is mainly applied to low-temperature liquid such as liquid oxygen, liquid nitrogen and liquid argon.

The invention belongs to the technical field of rubber tracks and preparation thereof, specifically relating to a high-strength rubber track for excavating machines and a manufacturing method thereof. The high-strength rubber track contains the following raw materials by weight part: 100 parts of natural rubber, 3-6 parts of zinc oxide, 1.5-2.5 parts of stearic acid, 1-2 parts of an anti-aging agent 4010 NA, 1-2 parts of an anti-aging agent RD, 40-60 parts of carbon black N330, 8-12 parts of white carbon black, 2-6 parts of Si-69, 3-6 parts of aromatic oil, 2-2.8 parts of S, 1.2-1.8 parts of accelerant Cz 1.2-1.8, and 0.5-0.8 part of scorch retarder Pvi. The high-strength rubber track prolongs service life thereof, and has the advantages of excellent appearance, low hardness, high tear resistance, high tensile strength, excellent ageing resistance and ozone resistance. The high-strength rubber track has lower dynamic heating performance, so the high-strength rubber track can keep excellent performance and appearance under the more bad service environment; the technology is simple; and raw material ratio is reasonable.

The invention relates to a complete-coverage transient electromagnetic detection method for continuously diagnosing corrosion and defects of pipe body metal. The method comprises the following steps of: performing a collection and analysis technology on a continuously-movable type transient electromagnetic response signal; calculating attribute abnormal indexes by utilizing a signal fluctuation range value through carrying out analysis treatment on a detection signal to reflect that states of pipeline burying depths, pipeline specifications, welding and the like are abnormal; calculating defect abnormal indexes by utilizing an attenuation comprehensive parameter value to reflect that the defects of pipe defects, corrosion, stress concentration and the like are abnormal; classifying pipe attribute abnormal indexes and pipe defect abnormal indexes so as to effectively detect the magnetic conductivity and the conductivity of a pipeline and carry out high-precision detection on the defects of a pipe body with the variation; and setting a risk threshold value to enhance intensive monitoring on a high-risk section; setting a welding mark threshold value and screening a suspected welding mark and the like; and covering a whole detection section aiming at integrity evaluation of an underground pipeline, and carrying out full-direction coverage detection on the corrosion and the defects of the pipeline.

The invention relates to a fusing type releasing device for an underwater anchor type heavy object and a using method thereof. The device comprises a fuse wire, and also comprises a horizontal pushing rod, a fuse wire fixed supporting rod, a fuse wire mobile supporting rod, and a rotary releasing rod. The fuse wire fixed supporting rod and the fuse wire mobile supporting rod are connected through a spring. The fuse wire mobile supporting rod is provided with a groove. One end of the rotary releasing rod is disposed in the groove of the fuse wire mobile supporting rod. Both the fuse wire mobile supporting rod and the fuse wire fixed supporting rod are provided with fixing bolts. The fuse wire mobile supporting rod can be pushed by the horizontal pushing rod so as to fix a fuse wire base to the fixing bolts of the fuse wire mobile supporting rod and the fuse wire fixed supporting rod. One end of the fuse wire is connected to an acoustic transponder through a cable. According to the device and the method, a problem that fuse wires cannot bear large-load heavy objects is overcome. By utilization of the device and the method, releasing of a large-load heavy object can be achieved, the application scope of the fusing releasing technology is broadened, and requirements of underwater practical application can be meet.

The invention relates to an active surface myoelectricity detection probe adopting optical fiber transmission. The active surface myoelectricity detection probe adopting optical fiber transmission comprises a power source transformation and management module. The active surface myoelectricity detection probe adopting optical fiber transmission is characterized by further comprising an active probe body, wherein the active probe body comprises a reference electrode, a measuring electrode and a system control center, the system control center selects the measuring electrode and the reference electrode as a measuring pair in a time sharing mode through a single-chip microcomputer, the potential difference of the measuring pair is fed into a differential amplification circuit through an electronic simulation switch so that amplification and filtering can be carried out, and the detection probe transmits collected data to an upper computer through optical fibers in a one-way mode. The active surface myoelectricity detection probe adopting optical fiber transmission can solve the problems in the prior art, coupling interference on electrode wires and data transmission lines can be lowered effectively, the problem of 50 Hz power frequency interference entering from a power supply power line in a coupling mode can be solved, and therefore the needs of practical situations are met.

The invention discloses a dynamic test device for rail flaw detection. The dynamic test device comprises a supporting frame, a sliding platform, a rail test block and an auxiliary device, wherein the supporting frame is used for carrying a flaw detection device; the flaw detection device is arranged at the upper part of the supporting frame; the sliding platform is movably arranged at the bottom of the supporting frame in the length direction of the supporting frame, and is located under the flaw detection device; the rail test block is arranged on the sliding platform, is located under the flaw detection device, can move opposite to the flaw detection device in the length direction of the supporting frame under the driving of the sliding platform, and is used for providing various damage simulations of a rail; the auxiliary device comprises a coupling water spraying device that provides coupling water for a contact surface between the rail test block and a detection wheel of the flaw detection device. According to the invention, the dynamic test device for rail flaw detection can dynamically provide an all-around damage test environment for the rail flaw detection work, and is simple to operate, flexible in arrangement, small in environmental impact, and strong in adaptability.

The invention discloses an oral cavity supporting device of an adjustable tongue retaining plate and relate to a dental auxiliary medical apparatus. The oral cavity supporting device has the functionsof distracting the oral cavity and preventing disturbance of the tongue. The oral cavity supporting device comprises an oral cavity supporting device body, the adjustable tongue retaining plate, a fixed length tongue retaining plate and a bidirectional lead screw, wherein when the oral cavity supporting device body is placed on one side of the oral cavity, the adjustable tongue retaining plate isconnected to the oral cavity supporting device body and a height adjusting rotary knob is connected to the middle of the bidirectional lead screw to adjust the height of the oral cavity supporting device body; a positioning rod is used for fixing corresponding positions of upper and lower parts of the oral cavity supporting device when the longitudinal height is adjusted. The oral cavity supporting device is I-shaped, the engaging part is of a concave arc shape, and the stress of the I-shaped structure is more centralized during engagement; the adjustable tongue retaining plate is of an embedded telescopic structure and a tongue retaining plate body is inserted into a tongue retaining sleeve to form the tongue retaining plate. The depth, inserted into the tongue retaining plate sleeve, ofthe tongue retaining plate is adjusted through three length adjusting holes. Balls on a V-shaped positioning elastic sheet are sunken into the three length adjusting holes to adjust and fix the stretching length of the tongue retaining plate body.

The invention relates to a column tray connecting device. The column tray connecting device comprises a fastener on a column tray, and also comprises a clamp plate below the column tray. The clamp plate is provided with grooves. The grooves cling to the lower surface of the fastener. A position on the clamp plate, which is corresponding to the fastener, is provided with a screw hole. The fastener is fixed to the column tray by passing a bolt through the screw hole and by a nut. The groove surfaces of the clamp plate of the column tray are aligned with a supporting ring, thus reducing the area of thrust surface of the supporting ring, enhancing self-fastening performance by utilization of local deformation during loading, and increasing positioning reliability. The column tray connecting device has advantages of a reasonable clamping structure, a compact structure, good fastening force performance, firm connection, capability of enhancing column tray fastening stability under high load conditions, and capability of guaranteeing high-load production of equipment. The column tray connecting device is suitable for connection between a column tray and a column tray supporting ring for a plate column in the oil refining industry and the chemical industry, high in positioning precision, high in fastening reliability, and suitable for high-load production of equipment, and can meet requirements of practical situations.

The invention discloses a method for preparing a noble metal nano-crystal load copper-zinc-tin-sulfur film. The method comprises the steps of preparing a noble metal nano-crystal particle dispersion liquid, preparing a dispersion liquid containing copper, zinc, tin, and sulfur sources, mixing the two dispersion liquids in the presence of stabilizer into a precursor solution with good dispersity and stability, and preparing a noble metal nano-crystal load copper-zinc-tin-sulfur film through spin-coating and sintering processes. According to the preparation method, the operation is simple, the reaction conditions are mild, and the requirement on raw materials is low. A noble metal nano-crystal load copper-zinc-tin-sulfur film prepared by the method has an excellent catalytic effect, the load capacity of noble metal nano-crystal can be regulated arbitrarily, and the film can be widely used in different fields.

The invention relates to the technical field of damping, in particular to a high-temperature-resistant paraffin oil rubber damping cushion and a manufacturing method thereof. The high-temperature-resistant paraffin oil rubber damping cushion comprises the following components in parts by weight: 100 parts of HNBR (Hydrogenated Nitrile Butadiene Rubber) of which the hydrogenation degree is 99 percent, 5-7 parts of zinc oxide, 1-2 parts of stearic acid, 1.5-2.5 parts of an anti-aging agent 4020, 1.5-2.5 parts of an anti-aging agent RD, 25-35 parts of carbon black N660, 25-35 parts of carbon black N774, 8-12 parts of DCP (Dibasic Calcium Phosphate) and 5-7 parts of TAIC (Triallyl isocyanurate). HNBR is taken as a substrate material, general carbon black of which the particle diameter is large relatively and semi-reinforcing carbon black are taken as fillers, a peroxide, i.e., DCP and an assistant crosslinker, i.e., TAIC are adopted in a vulcanization system, so that the problems of poor compressive permanent deformation property and poor high temperature resistance existing in the conventional material can be solved by using the damping cushion, and the requirements of practical conditions are met.

The perimeter security system of an intelligent high-end residential area disclosed by the present invention includes a detection layer, a transmission network layer I, a control layer, a transmission network layer II, and a monitoring layer. The detection layer is used to detect various illegal intrusion events and intrusion alarm information upload to the cell control layer of the control layer; the cell control layer receives the illegal intrusion alarm information detected by the detection layer, processes and distributes it to the central control layer and the monitoring layer, and the central control layer receives the alarm information sent by the cell control layer for Centralized maintenance and management of the system; the monitoring layer receives the alarm information sent by the cell control layer, and displays and sends out audible and visual alarms on each terminal; the transmission network layer I is the communication transmission network, and the transmission network layer II is the communication data network for alarm video The transmission of information meets the needs of the monitoring layer for viewing and processing of alarm information. The invention can meet the actual situation requirements along the perimeter of the residential area, and can effectively deter, block and alarm intruders.

The invention provides a control method for maximum driving speed of a vehicle. The method comprises the following steps of: acquiring first environment information used for describing the environment situation on the driving of the vehicle; generating the maximum driving speed value of the vehicle through a preset function according to the first environment information, wherein the independent variable of the preset function is the first environment information, the dependent variable of the function is the maximum driving speed value of the vehicle, and the function belongs to a monotonic decreasing function; and controlling the maximum driving speed value of the vehicle according to the maximum driving speed value. The invention further provides a control system for the maximum driving speed of the vehicle. In the invention, the continuously changed maximum speed value within a certain range can be obtained according to the driving situations of the vehicle, and the dynamic adjustment on the maximum speed can be realized, thereby preferably meeting the needs of practical situations.

The invention discloses a modularized dexterous hand mechanical structure which comprises a palm, a thumb and three or four fingers. The thumb comprises a thumb steering engine, a thumb base, a thumb base joint, a thumb base joint motor, a thumb near knuckle connecting base, a thumb base joint worm gear, a thumb base joint worm, a thumb near knuckle joint shaft, a thumb near knuckle, a first thumb coupling connecting shaft, a second thumb coupling connecting shaft, a thumb coupling transmission connecting rod, a thumb far knuckle joint shaft and a thumb far knuckle. A coupling four-link mechanism is formed by the thumb near knuckle joint shaft and the first thumb coupling connecting shaft, the thumb near knuckle joint shaft and the thumb far knuckle connecting shaft, the second thumb coupling connecting shaft and the thumb far knuckle connecting shaft and the thumb coupling transmission connecting rod. By means of the modularized dexterous hand mechanical structure, a thumb tip and the middle of an index finger can be used in cooperation to grip an article, the thumb tip and any finger tip can be used in cooperation to grip an article, and the whole structure can be implement grab an article in an enveloping manner.

The invention discloses a large public place building design method based on mobile platform analysis. The method comprises the steps of obtaining historical people flow data of all areas of a public place to plan distribution of disinfection devices; establishing a time judgment model, setting a starting people number threshold value and a minimum starting time threshold value, obtaining people flow data and timing data of each region in real time, carrying out statistics, and inputting the statistics data into the time judgment model; when the people flow rate data is greater than or equal to the starting people number threshold value, if the timing data is greater than or equal to the minimum starting time threshold value, forming a disinfection instruction immediately, and if the timing data is smaller than the minimum starting time threshold value, forming a disinfection instruction when the timing data reaches the minimum starting time threshold value; sending the disinfection instruction to a disinfection device, and when the disinfection device receives the disinfection instruction, resetting people flow data and timing data; the invention has the effect of improving the rationality of public place disinfection interval arrangement.

The invention discloses a coil structure of a multi-voltage experimental transformer. The coil structure comprises a primary coil and a secondary coil, the primary coil is of a corner connection structure, the secondary coil comprises an upper half coil and a lower half coil, and a switching device used for regulating a connection mode of the upper half coil and the lower half coil is arranged between the upper and lower half coils. The connection mode of the upper half coil and the lower half coil is parallel corner connection, serial corner connection or serial star connection. The transformer adopting the coil structure can output various different voltage classes, and needs of a laboratory are met.

The invention discloses a dynamic test method for rail flaw detection. The dynamic test method comprises the following steps: a flaw detection device is arranged at the upper part of a supporting frame; a sliding platform is movably arranged at the bottom of the supporting frame in the length direction, wherein the sliding platform is located under the flaw detection device; a rail test block is arranged on the sliding platform, wherein the rail test block is located under the flaw detection device, can move opposite to the flaw detection device in the length direction of the supporting frame under the driving of the sliding platform, and is used for providing various damage simulations of a rail; an auxiliary device is arranged on the supporting frame, wherein the auxiliary device further comprises a coupling water spraying device that provides coupling water for a contact surface between the rail test block and a detection wheel of the flaw detection device. According to the invention, the dynamic test method for rail flaw detection can dynamically provide an all-around damage test environment for the rail flaw detection work, and is simple to operate, flexible in arrangement, small in environmental impact, and strong in adaptability.

The invention discloses a novel intelligent laser cutting machine, which includes a machine tool body. The feeding end of the machine tool body is provided with a driving roller, both sides of the machine tool body in the length direction are internally and slidably provided with lifting type protective isolation plates correspondingly, the machine tool body is internally provided with a driving mechanism which drives the lifting type protective isolation plates to slide up and down, and infrared ray alarms connected with driving mechanism circuit signals are fixedly arranged on both sides, near the driving roller, of the machine tool body in the length direction correspondingly; and the infrared ray alarms are vertically arranged with the side wall of the machine tool body, mirror face refracting plates are fixedly arranged on both sides, near the infrared ray alarms, of the machine tool body correspondingly, the mirror face refracting plates are obliquely arranged at 45 degrees, andinfrared ray receiving plates are vertically fixedly arranged on both sides, away from the driving roller, of the machine tool body correspondingly. According to the novel intelligent laser cutting machine, the condition that apprentice inadvertently closes to observe laser cutting head work can be effectively avoided, and safety is improved.

The invention discloses a robot visual system for mine rescue and a control method for the robot visual system. The system comprises a rescue robot and a corresponding visual and control system. The rescue robot is provided with an environment information collection unit for collecting an onsite image, a drive unit, a connection and assistance unit, and a control processing unit. The environment information collection unit comprises a camera and an LED light source. The drive unit comprises a DC motor, a steering motor, a drive wheel, and a crawler belt. The connection and assistance unit comprises a shaft sleeve, a power supply, a big U-shaped frame, a small U-shaped frame, a box cover, a controller box body, a rescue article box body, a rescue article, a cover opening buckle, and a box cover rotating shaft. The control processing unit comprises a controller. The visual and control system on the controller comprises an image collection module, an image processing module, a motor, anda steering engine drive module. The system can achieve the high-efficiency recognition of a mine tunnel scene autonomously, quickly and accurately, and can provide corresponding medical and material assistances.

The invention provides a soft shaft support device of glass bent tempering equipment. The soft shaft support device comprises a plurality of rows of square pipes and a variable-arc mechanism, whereinthe plurality of rows of square pipes are in parallel arrangement in a direction vertical to the glass movement direction; a soft shaft is arranged on the square pipes; the axial direction of the softshaft is vertical to the glass movement direction; the variable-arc mechanism is two rows of tooth plates in staggered arrangement; a plurality of tooth plates positioned in the same row are sequentially engaged and connected; the adjacent tooth plates positioned in different rows are rotationally connected; projected parts are arranged on the tooth plates; connecting holes capable of being arranged on the square pipes in a sleeved way are formed in the projected parts; the square pipes pass through the connecting holes to realize one-to-one corresponding installation with the tooth plates; the tooth plate at the outermost side of the variable-arc mechanism is connected with a chain. By using the device, the glass shaping precision and tempering quality can be improved; the deformation problem due to too long square pipe can be effectively avoided, so that the batch production quality of the long-dimension glass can be guaranteed.

The invention relates to a sewage well capable of easy climbing. The well comprises a round well body, wherein a sewage inlet pipe is connected to the upper part of one side of the well body, the sewage inlet pipe is disposed downwards in an inclined manner, a sewage discharge pipe is disposed on the lower part of the other side of the well body, and an inclined head end which is bent downwards at 30 DEG is disposed at the sewage discharge pipe inside the well body; a well cover is disposed at the well opening on the well body top, the well cover comprises a conical and annular well cover support and a round cover body connected to the upper part of the well cover support, through holes which are distributed uniformly are formed in side walls of the well cover support, and a seal ring is disposed at a joint between the cover body and the well cover plate; an arc filter net which is sunken downwards is disposed on the lower face of the well opening located under the cover body; a climbing ladder is disposed uniformly and vertically on the inner wall of the well body, and an anti-skid layer sleeves the climbing ladder; and blocking is not easy, cleaning is easy, and pollutant sedimentation is easier.

The invention relates to the technical field of surface grinder motor stators, in particular to a surface grinder motor stator assembling and disassembling system and a using method thereof. The surface grinder motor stator assembling and disassembling system comprises a motor rotor, a motor stator, a stator guide sleeve and a surface grinder, wherein the motor stator is arranged on the outer side of the motor rotor; a positioning step is arranged at one end of the motor rotor; the stator guide sleeve is positioned at the positioning step and arranged on the outer side of the motor rotor; and the surface grinder is in inserting connection with one end of the stator guide sleeve, so that the problem that the enameled wire of the motor stator can be damaged in case of any carelessness when the surface grinder motor stator is disassembled and assembled and the newly exchanged stator is scraped and the problem of damage to the enameled wire, caused by decentraction when the stator is assembled, are solved. The surface grinder motor stator assembling and disassembling system has the advantages of reasonable structure, simple and practicable assembly using method and high safety and reliability, and can meet the requirements of the actual condition.

The invention discloses a dynamic test device for rail flaw detection. The dynamic test device comprises a supporting frame, a sliding platform, a rail test block and an auxiliary device, wherein the supporting frame is used for carrying a flaw detection device; the flaw detection device is arranged at the upper part of the supporting frame; the sliding platform is movably arranged at the bottom of the supporting frame in the length direction of the supporting frame, and is located under the flaw detection device; the rail test block is arranged on the sliding platform, is located under the flaw detection device, can move opposite to the flaw detection device in the length direction of the supporting frame under the driving of the sliding platform, and is used for providing various damage simulations of a rail; the auxiliary device comprises a coupling water spraying device that provides coupling water for a contact surface between the rail test block and a detection wheel of the flaw detection device. According to the invention, the dynamic test device for rail flaw detection can dynamically provide an all-around damage test environment for the rail flaw detection work, and is simple to operate, flexible in arrangement, small in environmental impact, and strong in adaptability.

The invention relates to a multiple-laser radar raster map merging system based on a pilotless automobile. The multiple-laser radar raster map merging system based on the pilotless automobile comprises a one-line laser radar and a four-line laser radar, the two of which are mounted in front of the pilotless automobile, an eight-line laser radar mounted at the roof of the automobile, and a one-line laser radar mounted at the tail of the automobile; the laser radars are connected with a first industrial personal computer by use of a switch and by virtue of Ethernet; the data of the laser radar are transmitted to the first industrial personal computer by use of the switch and by virtue of the Ethernet, and the first industrial personal computer is used for analyzing and preprocessing the data; data are processed for different laser radars, respectively, and rasterization coding is performed on valid data and the coded values are transmitted to the first industrial personal computer in charge of data fusion by virtue of the Ethernet; next, data fusion is carried out by use of a raster map merging method and the rasterization coding is performed on the data, and finally, the coded values are transmitted to a second industrial personal computer by virtue of the Ethernet. The multiple-laser radar raster map merging system is used for solving the problem that the pilotless automobile and an assistant-driving automobile collide with a barrier, and therefore, the safety of the automobile in the driving process is improved.

The invention relates to a coal mine accident environment monitoring and rescuing system which comprises a rescue car. The rescue car is provided with a monitoring unit and an alarm unit, wherein the monitoring unit comprises a camera, and the alarm unit comprises an alarm. The rescue car comprises a car body; car windows and car doors are arranged on the side faces of the car body; wheels are arranged at the bottom of the car body, and comprise front wheels and rear wheels; the number of the front wheels is two; a front axle is connected between the two front wheels; the front axle is connected with the bottom of the car body through a front suspension; the number of the rear wheels is two; a rear axle is connected between the two rear wheels; the rear axle is connected with the bottom of the car body through a rear suspension; and a gasbag is arranged on the top of the car body. The coal mine accident environment monitoring and rescuing system is high in rescue efficiency and good in rescue effect, avoids injuries to rescue workers, improves the automatic degree, and meets the demand of practical conditions.

The invention relates to the technical field of communication equipment, and discloses a 5G communication tower with a signal antenna convenient to adjust. The 5G communication tower comprises a towerbody, wherein a shell is fixedly connected to the exterior of the tower body, a rotating rod is movably connected to the exterior of the shell, a limiting plate is fixedly connected to the outer surface of the rotating rod, a gear II is fixedly connected to the outer surface of the rotating rod, and the exterior of the gear II is engaged with a gear I. According to the invention, through the interaction among the rotating shaft, the gear I, the gear II, the rotating rod, the rotating shaft, the connecting rod, the swing rod, the gear III, the connecting block, the control assembly I and the control assembly II, the coverage range of the antenna can be adjusted as required, so that a debugging worker does not need to climb to the top of the communication tower for adjustment, the labor amount of the debugging worker is reduced, dangerous accidents caused by aloft work of debugging workers are avoided, adjustment of the coverage range of the antenna of the range communication tower is facilitated, and the requirement of the actual situation can be met.

The invention relates to a marine high-pressure-resistant bidirectional rotary sealing ring which comprises a housing, an end cover, a first supporting ring, a second supporting ring, a sealing lip provided with a spring, a first O-shaped sealing ring, a second O-shaped sealing ring and a rectangular sealing ring with auxiliary sealing functions, a first fastening piece and a second fastening piece, wherein the spring is mounted on the sealing lip; the first O-shaped sealing ring is mounted on the housing; the second O-shaped sealing ring is mounted on the second supporting ring; the sealing lip, the first supporting ring, the second sealing ring and the rectangular sealing ring are mounted in the housing in sequence; the end cover and the housing are connected and fastened through the first fastening piece and the second fastening piece; the sealing lip is made from PTFE (poly tetra fluoro ethylene) material. The marine high-pressure-resistant bidirectional rotary sealing ring is good in sealing effect, and capable of reducing cost and meeting the needs of practical situations.