274results about How to "Easy to observe in real time" patented technology

The invention discloses a photoelectricity-navigation-based unmanned road recognition system which comprises a vision module, an image processing module, a road recognition module, a speed control module and a steering control module. Turning at a crossroad is mainly achieved through handling a road border, simulating a target trajectory at a track center and recognizing a turning sign. The multi-element PID steering control module and the speed control module realize constantly changing target trajectory when a vehicle rapidly tracks, and realize specified speed and the steering function through identifying color lumps marked by different colors. The intelligent optimized control system is different from a traditional tracking vehicle. The photoelectricity navigation vehicle can realize manless driving without peripheral support through identifying road borders (green belts, fences and the like) in reality and steering signs, thereby having a practical significance.

The invention provides a shearing force-electricity combined stimulation cell culture device, which mainly comprises an incubator, a peristaltic pump, a downstream liquid storage bottle, an upstream liquid storage bottle, a signal generator and a flat flowing cavity. The peristaltic pump and the downstream liquid storage bottle are connected with components such as upstream liquid storage bottle and the like through silicone tubes to form a culture solution perfusion system for providing nutrition required for cell growth and loading shearing force stimulation to cells; the signal generator is used for providing electrical signals for loading electricity stimulation to the cells; and the flat flowing cavity is used for providing a substrate required for the cell growth and connected with the signal generator and the culture solution perfusion system to provide a shearing force-electricity combined acting environment for the cells on a flat electrode. The device establishes a cell culture environment of combining force stimulation and electricity stimulation, overcomes the defect that the prior art cannot simulate in vivo cells in the force-electricity combined acting environment, and lays a foundation for promoting functionalized culture of the cells and tissues.

The present invention discloses an experimental animal low-pressure cabin for plateau medicine research, and a pressure control method based on the experimental animal low-pressure cabin, and belongs to the technical field of medical scientific research instrument equipment. The experimental animal low-pressure cabin comprises a work cabinet and an electrical cabinet arranged on the bottom portion of the work cabinet, wherein the work cabinet adopts the full transparent design so as to easily meet the illumination requirements of the experimental animals and make the laboratory personnel easily perform real time observation on the experimental animals, a gas inlet pipe extending into the work cabinet and a gas discharge pipe extending into the work cabinet are arranged inside the electrical cabin, the gas inlet pipe and the gas discharge pipe are respectively provided with an electrically controlled proportional valve and a diaphragm vacuum pump, an electrical program control system is further arranged inside the electrical cabinet, and a PLC controller adjusts the dynamic balance between the gas complementing amount and the gas exhaust amount by controlling the opening degree of the electrically controlled proportional valve and the opening of the diaphragm vacuum pump so as to make the altitude fluctuation be maintained at a certain level. According to the present invention, the air pressure control way used by the control method of the present invention is unique, the fluctuation range is small, the accuracy is high, and the number of the gas exchange can be ensured.

A partition method of three dimensional medical images based on ray casting volume rendering algorithm belongs to the technical field of image processing and relates to the physical partition method of three dimensional medical images. The method includes the following steps of: first converting a two dimensional MRI slice image sequence into three dimensional cuboid data Volume1, revolving the three dimensional cuboid data Volume1 to obtain an optimal visible area ROI; then adopting a regular geometry Volume2 with space size less than that of Volume1 to conduct virtual partition on the Volume1 and to obtain a space geometry Volume3 after the Volume1 is partitioned from the Volume2; subsequently conducting ray casting sampling on the space geometry Volume3; and finally conducting image reconstruction on the space geometry Volume3. Different from a common partition method which first partitions the three dimensional medical images and then reconstructs images, the partition method conducts the partition and three dimensional reconstruction simultaneously, thus increasing arithmetic speed greatly, having high real-time and being capable of observing the required regions at real time through methods of rotation, light illumination and the like so as to find out the association among tissues and facilitate accurate medical analysis and judgment.

The invention relates to a real-time detection evaluation system for human foot dynamic mechanics and a method. A first sensing device of the system is used for detecting a vertical force, a shear force and a torque of a foot sole and generating first detection data; a second sensing device is used for detecting an average pressure value and a peak pressure value of the foot sole and a contact area between the foot sole and the ground and generating second detection data; a motion sensing trace component is used for detecting a real-time contact angle between the foot and the ground, an accelerated speed and a linear acceleration and generating third detection data; a data processing transmission module is used for respectively packaging and processing the first detection data, the second detection data and the third detection data into a data packet; an upper computer is used for unpacking, integrating and converting the data packet, calibrating and calculating the coefficient, extracting, analyzing and displaying the data, modeling the data feature, evaluating the relation between real-time progressing and data and acquiring human foot dynamic mechanic characteristics. The real-time detection evaluation system for human foot dynamic mechanics has the advantages of wide application scope, capability of detecting tread time-space domain parameters, accurate detection data and accurate evaluation.

A microfluidic cell culture chip comprises an upper chip and a lower chip. The upper chip is provided with a first through hole, a first fluid passage, a first gas passage and a first exhaust passage are arranged on the upper surface of the upper chip, wherein the first exhaust passage is communicated with the first through hole. The lower chip is provided with a second through hole, and a second fluid passage, a second gas passage and a waste fluid passage which are communicated with the second through hole are arranged on the upper surface of the lower chip. The first fluid passage and the second fluid passage are communicated, the first gas passage and the second gas passage are communicated, an upper film layer is covered on the upper surface of the upper chip, a bottom layer sealing structure is arranged on the lower surface of the lower chip, the upper chip and the lower chip are pressed to be fit, a heating device is arranged between the lower surface of the lower chip and the bottom layer sealing structure, and the upper film layer, the first through hole, the second through hole and the bottom layer sealing structure surrounds to form a cell culturing cavity. The invention further discloses a real-time observation system of the microfluidic cell culture chip.

The invention provides a 3-dimensional (3D) measurement method for reverse images, relates to image data processing of a 3D target, and discloses a 3D measurement method based on reverse images and derived from utilization of a camera model and a basic principle of projective geometry. The 3D measurement method comprises steps as follows: manufacture of a reverse image camera measuring device, calibration of a reverse image system, calculation of the camera position, calculation of a target height, coordinate system transformation regulation and 3D ruler display of the reverse images. The method can measure the height and the 3D coordinates of the target on a pavement, can achieve the function of two-dimensional plane measurement of the reverse images simultaneously, overcomes the defect that the height of the target cannot be measured in two-dimensional plane measurement of the reverse images, and reduces traffic accidents.

The invention relates to a planting and breeding network renting system, and is used to solve the problem of the large planting and breeding renting difficulty. According to the planting and breeding network renting system, one or more parallel planting and breeding farms are divided into a plurality of parallel planting and breeding sub units, each sub unit is equipped with on-site sensing control equipment for acquiring or monitoring planting and breeding conditions in real time, the sensing control equipment is connected with a network renting platform through a communication network, the network renting platform is connected with an administrated terminal of a farm business manager and tenant terminals of tenants of the various planting and breeding sub units. The network renting platform is a network platform for online planting and breeding renting. The planting and breeding farms comprise breeding farms which are specially used in breeding and which comprise a plurality of parallel breeding sub units, planting farms which are specially used in planting and which comprise a plurality of parallel planting sub units, and planting and breeding combination farms which are used in parallel planting and breeding and which comprise a plurality of parallel breeding and planting sub units. The planting and breeding network renting system is advantageous in that increasement of farmer's income is facilitated, prices of urban agricultural products are reduced, it is convenient for tenants to observe planting and breeding conditions and participate planting and breeding management, the planting and breeding difficulty is substantially reduced and the tenant management level is improved.

The invention discloses a high-speed high-precision 3D printer and mainly relates to the technical field of 3D printing. The high-speed high-precision 3D printer comprises an X-axis module, a Y-axis module, a Z-axis module, an extrusion mechanism, a platform mechanism and a machine casing; the Z-axis module comprises two retaining plates; a Z-axis ball screw and two Z-axis uprights are arranged on the retaining plates; the Z-axis uprights are in pin connection with the machine casing through a plurality of positioning pins; two Z-axis linear guide rails are mounted on the Z-axis uprights; a nut of the Z-axis ball screw and sliders of the Z-axis linear guide rail all are fixed on the platform mechanism; the Y-axis module is fixed at the top ends of the Z-axis uprights; the X-axis module comprises an X-axis upright that is in sliding connection with the Y-axis module in a Y-axis direction; an X-axis ball lead and two X-axis linear guide rails are mounted on the X-axis upright; the extrusion mechanism is mounted on a nut of the X-axis ball screw and the sliders of the two X-axis linear guide rails. The high-speed high-precision 3D printer has the beneficial effects of stable transmission, high mechanical strength, and remarkable increase of precision and speed.

The invention discloses a multifunctional monitoring device for corrosion damage of an underground concrete structure, and relates to the field of civil engineering monitoring devices. The multifunctional monitoring device for corrosion damage of the underground concrete structure is suitable for being connected with a steel bar of the underground concrete structure, and comprises a monitoring system, a wireless transmission device and a fixing mechanism. The monitoring system comprises strain sensors, a temperature sensor and PH value monitoring equipment, wherein the strain sensors, the temperature sensor and the PH value monitoring equipment are connected with the steel bar through the fixing mechanism and further connected with the wireless transmission device. Multifunctional monitoring of corrosion damage of the underground concrete structure is achieved by arranging the strain sensors, the temperature sensor and the PH value monitoring equipment, signals collected by the strain sensors, the temperature sensor and the PH value monitoring equipment are transmitted to an operation interface through the wireless transmission device, and monitoring personnel can observe the corrosion damage condition conveniently in real time. The device is small in size, and the monitoring system has few influences on the structure.

The invention relates to a freshwater fish demersal egg incubation device and method. The freshwater fish demersal egg incubation device and method are suitable for incubation of fish demersal eggs or adhesive eggs processed in a debonding mode. The device comprises a container, wherein the bottom of the container is in a U shape, one side portion of a container inner cavity is provided with a water injection pipe facing the position below the corresponding side portion of the container, an opening above the other side portion of the container inner cavity is correspondingly provided with an arc turn portion, and the arc turn portion is turned towards one side of the water injection pipe from bottom to top so that injected water flow form annular flow. The method comprises the steps that debonded germ cells are slowly placed in the container filled with water and sink slowly; a water injection pipe valve is opened and is adjusted in a fine mode according to the proportion of the germ cells, the water flow is controlled so that the water flow can rotate in the perpendicular plane in the container to drive the germ cells to rotate, and dead cells and light impurities are removed under the action of centrifugal force; the water flow is kept being injected, and a net bag is cleared when fries are about to be incubated; the fries are collected after being incubated. According to the freshwater fish demersal egg incubation device and method, the germ cells can be prevented from being accumulated on local parts, the dead cells and egg shells are separated from other impurities, and an incubation effect is good.

The invention provides a water level flow sensor, a water level flow monitoring system and a water level flow monitoring method. The water level flow sensor comprises a water level measuring rod with multiple contacts, a multipath voltage comparison circuit connected with the contacts, a multipath selection circuit correspondingly connected with the multipath voltage comparison circuit, a master control circuit for receiving signals output by the multipath selection circuit, and a data transmitting and output circuit connected with the master control circuit. The water level flow monitoring system comprises an upper computer and the water level flow sensor which are correspondingly connected through an RS-232 / RS-485 converter. The water level flow sensor and the water level flow monitoring system have the advantages that water level flow in channels can be measured in water continuously, accurately and quickly, results can be displayed in a digital tube and the upper computer, the water level flow sensor and the water level flow monitoring system are corrosion resistant, long in service life and stable in operation, and the like.

The invention discloses a remote monitoring and controlling system for an industrial grade photo bioreactor. The remote monitoring and controlling system comprises detecting and analyzing terminals: a temperature sensor, an on-line pH analyzer, an on-line dissolved oxygen analyzer, an on-line carbon dioxide analyzer and the like and a remote controlling platform, and the detecting and analyzing terminals are communicated with the remote controlling platform via communication network. The detecting and analyzing terminals of the remote monitoring and controlling system are arranged in the industrial grade photo bioreactor. By communication between the detecting and analyzing terminals and the remote controlling platform, when the culture environment is changed, the remote controlling platform regulates various physicochemical indexes remotely, thus realizing bidirectional interaction between the photo bioreactor and the remote controlling platform.

The invention discloses a system for eliminating a vehicle pillar blind zone and a use method thereof. The system comprises a power management module 11, an image acquisition module 12, a position detection module 13, a processing center module 14, an image display module 15 and a blind zone detection module 16. The vehicle pillar blind zone of an automobile can be eliminated through digital image processing and projection technologies, so that the technology is reliable, the reconstruction cost is low, a picture of the blind zone can be intelligently and effectively detected in real time, and real-time information is timely provided for a driver to realize transparency of the automobile pillar.

The invention discloses a fixing apparatus for volume uniform radiation test of laboratory mice and belongs to fixing apparatus for animal experiments. The fixing apparatus comprises a cylindrical casing with the bottom end closed and the top end open, a circular cover plate capable of being connected fixedly in a detachable manner and capping the top opening of the cylindrical casing, and multiple water-drop-shaped chambers which are placed in the circular casing for containing the laboratory mice and in the shape fitting with shapes of the laboratory mice. The chambers are in radial arrangement with the centripetal tip ends and outwards round ends, the round ends are tangent with the wall of the casing, and through holes which are designed in size enabling tails of the mice to pass through and run through the wall of the casing and the walls of the chambers are formed below the tangent lines respectively. Multiple laboratory mice can be fixed completely at one time and then subjected to uniform radiation, so that consistency of experimental radiation dose is guaranteed while experiment efficiency is increased. The fixing apparatus is simple in structure, low in cost, convenient to operate and use and easy to produce and promote.

The invention discloses a method for measuring deep groundwater flow rate. A hole is drilled in a measuring area, and if water appears in the borehole, drilling is stopped. A measuring device is placed into the borehole from the center of a casing through a measuring tube step-by-step. A collecting device is turned on. The falling position of the measuring tube is observed through a visual camera.When water flow is found, falling is stopped. A rotary centralizer is arranged at the top of the ground to keep the measuring tube in the vertical direction. The direction of the water flow is observed through the visual camera. If the water flow direction is parallel to the measuring device, the measuring tube is rotated, and the value of the flow rate is observed and collected. The steady maximum is the flow direction of the water flow. The upper end of the measuring tube is fixedly on the upper port of the casing through hard connection. The measured water flow is monitored in real time. Due to the convenience of the Dopod principle, a measuring element protruding into an overflowing tube can measure the instantaneous flow rate and the average flow rate. The method provided by the invention can measure deep groundwater and can determine the specific direction of the water flow.

The invention discloses a method for processing electroencephalogram noise under nuclear magnetism. One end of a reference electrode is connected with a human brain through conductive paste; the other end of the reference electrode is connected into one end of a first differential amplifier; one end of a signal electrode is connected with the human brain through conductive paste; the other end of the signal electrode is connected into the other end of the first differential amplifier; an electroencephalogram signal with an interference signal is obtained by the signal electrode through acquiring; one end of a simulation reference electrode is connected with a simulation impedor; the other end of the simulation reference electrode is connected to a second differential amplifier; one end of a simulation signal electrode is connected with the simulation impedor; the other end of the simulation signal electrode is connected to the second differential amplifier; the interference signal is obtained by the simulation reference electrode through acquiring; the reference electrode is electrically isolated from the simulation reference electrode; the signal electrode is electrically isolated from the simulation signal electrode. According to the method disclosed by the invention, a noise template can be accurately acquired in real time, and the problem that a noise model estimated by the traditional signal processing method is inaccurate is solved; the processed result can be outputted by a noise processing algorithm in real time, so that the real-time observation of experiment conditions is facilitated.

The invention provides an in-situ test system for mechanical properties of a nano material. The in-situ test system comprises a scanning electronic microscope, a scanning probe test unit, a control unit and a computer; the scanning probe test unit comprises a base, an adjusting table arranged at one side of the upper surface of the base, and a measuring mechanism arranged at the other side of the upper surface of the base; the scanning electronic microscope comprises an electron microscope pole shoe, and the adjusting table is provided with a sample table, an X-axis adjusting apparatus, a Y-axis adjusting apparatus and a Z-axis adjusting apparatus; the measuring mechanism comprises a laser light path adjusting apparatus, a probe foundation support arranged on the base, and a probe arranged on the probe foundation support, the probe is positioned below the electron microscope pole shoe, and the laser light path adjusting apparatus is used for collimating and focusing laser. By adopting the in-situ test system and the in-situ test method, an acting process of the scanning probe and a sample and an evolution process of a sample microstructure under a physical mechanical function of an external field in the test process can be actually observed in site, and micro images of a series event and mechanical property test data are transmitted to a computer.

The invention discloses a solar ray angle measuring device of a photovoltaic tracking system and a measuring method of the solar ray angle measuring device, which belong to the metering field. The solar ray angle measuring device comprises a rotatable hollow cylinder mounted on a base, an axial rectangular groove and an oblique groove which are not intersected with each other and can transmit light are disposed on the cylinder, and a photovoltaic battery is mounted at the bottom of the inside of the cylinder and connected with a control circuit. The principle that short-circuit current of the photovoltaic battery is proportional to the area of a portion, which is irradiated by solar rays, of the battery is adopted under the condition of certain illumination intensity, accordingly a rotation angle of the cylinder is detected when the short-circuit of the photovoltaic battery is the maximum by means of controlling rotation of the cylinder via the control circuit, and angles of the solar rays are computed and are timely mastered. The solar ray angle measuring device and the measuring method have a great significance in analyzing solar light intensity of the ground and intensity of ultraviolet rays, and can be used for measuring the altitude angle and the azimuth angle of the solar rays.

The invention discloses lentivirus vectors expressing exosome markers and a building method and application of the lentivirus vectors.The lentivirus vectors are characterized in that CD63 and CD9 genes with SBP labels are introduced into the multiple cloning sites XbaI and NotI regions of pCDH-CMV-MCS-EF1-Puro, green fluorescent protein genes ZsGreen1 with extremely high fluorescence ability are added to the rear of the introduced CD63 and CD9 genes at the same time, and the recombinant lentivirus vectors pCDH-CMV-CD63-SBP-ZsGreen1-EF1-Puro and pCDH-CMV-CD9-SBP-ZsGreen1-EF1-Puro are built.The lentivirus vectors expressing the exosome markers have the advantages that green fluorescent protein genes ZsGreen1 fast in maturation has a high fluorescent effect which facilitates real-time observation, the expressed exosome carries the SBP labels, and exosome observation and purification can be integrated.

The invention relates to a self-service car washer. The self-service car washer comprises a machine body device used for supporting, an intelligent water control device used for conducting car washing, and a control device used for switching of car washing functions, wherein the machine body device comprises a case body, a supporting frame and a bearing cross beam are arranged inside the case body, a one-way openable door is further arranged on the case body, a panel window is arranged on the one-way openable door, the intelligent water control device comprises a filter, a water tank and a washing fluid tank, the filter, the water tank and the washing fluid tank are connected through guide pipes, a pressure sensor A and a pressure sensor B are arranged on the bottom of the water tank and on the bottom of the washing fluid tank and are connected through a control valve A and a control valve B, the control device comprises a panel body, a water outlet control key, a bubble outlet control key, a magnetic card sensing area and a coin slot are arranged on the panel body, and then diversified consumption of customers is facilitated. The self-service car washer has the advantages of being simple in structure, convenient to use and complete in function.

The invention discloses an image self-learning enhancement method and system. The method comprises the following steps that an image self-learning assessment unit is trained, and optimal enhancement algorithms corresponding to the types of different images are determined according to the types of different images; and a real-time image acquired by an image acquisition unit is transmitted to a real-time image enhancement unit, and the real-time image enhancement unit acquires image feature parameters of the real-time image acquired at present, determines the type of the image according to the real-time image feature parameters, acquires the optimal enhancement algorithm corresponding to the image type from the image self-learning assessment unit and conducts enhancement processing on the real-time image by using the optimal enhancement algorithm corresponding to the image type. Accordingly, the problem that the sea area images acquired in real time are not clear can be effectively solved, and the method and system are beneficial for technicians to observe the maritime environment and have a wide prospect in the fields of national defense, security protection, maritime search and rescue and the like.

The invention discloses a central air conditioner monitoring system and method. The system comprises a detection unit, a cloud platform analysis operation and maintenance unit and a terminal feedbackunit, wherein the detection unit is used for detecting and collecting various types of parameter information of quality of air inside and outside a building and the operation state of a central air conditioner and conducting preliminary analysis and uploading on the various types of collected parameter information; the cloud platform analysis operation and maintenance unit is used for receiving the various types of parameter information, conducting secondary analysis on the received various types of parameter information and issuing a result after the final result is formed; and the terminal feedback unit is used for receiving the final result formed through analysis and calculation and the whole analysis process and monitoring operation of the cloud platform analysis operation and maintenance unit. The method comprises the steps of detection, operation and maintenance of a cloud platform and terminal feedback. The application scope of the central air conditioner monitoring system andmethod is highly matched with the application environment of the daily air conditioner of residents; real-time monitoring of relevant parameters such as the quality of the air inside and outside a habitable room and the environment temperature can be effectively completed; and compared with existing equipment, the central air conditioner monitoring system is better in monitoring effect.

The invention discloses a pre-mixing stirring system of raw materials. The system comprises a shell, a stirring shaft, an actuating device, a dust recycling device, a dust collector and a stock bin. An exhaust port and at least one entrance of raw materials are installed at the top of the shell. The stock bin is connected to the entrance of raw materials. A containing space is formed inside the shell. The stirring shaft passes through the shell, with both ends thereof outside the shell. One end of the stirring shaft is connected to the actuating device, while the other end is connected to the shell through a fixed seat. Supporting boards are arranged on the stirring shaft inside the shell at intervals. Two helical ribbons with opposite rotating directions are installed on each supporting board. A discharge port is installed at the side edge of the shell below the fixed seat. The exhaust port is connected to the dust recycling device through an exhaust pipe. The dust collector is installed below the dust recycling device. Through the approaches mentioned above, the pre-mixing stirring system of raw materials presented by the invention can avoid the floating and the diffusing of pulverized raw materials caused by the rotating of the blender; and avoid the pollution of ambient environment by recovering the dust contained in the flue gas.

The invention relates to an area array point scanning light-splitting white-light interferometer. An SLD light source emits a broadband spectrum, light sequentially passes through an isolator and an optical fiber coupler, an optical fiber end emits emergent light that is collimated through a collimator and is incident to a beam splitter prism by the collimated light, one beam of light is reflectedand focused to a reflector through a third lens to serve as a reference arm, and the other beam of light is incident to an XY scanning galvanometer; light with a certain field angle is reflected by ascanning galvanometer and enters a fourth lens, and the light is focused to a sample through the fourth lens to achieve area array scanning. The XY scanning galvanometer is placed at the object spacefocal plane position of the fourth lens, so that the focusing light of the fourth lens is an image space telecentric light path; area array scanning can be realized in a high-speed, concise and high-precision manner.

The invention discloses a drilling assistant tool applied to a hanging bar installation procedure. The drilling assistant tool comprises a conical barrel I, a conical barrel II, a conical barrel III and a sleeve, wherein the small-diameter section of the conical barrel III is connected with the upper end face of the sleeve; a first annular cavity is arranged on a main body of the conical barrel III; a plurality of springs II are arranged on the bottom part of the first annular cavity; an extending section is arranged on the end face of the conical barrel II along a circumferential direction of the small-diameter section of the conical barrel II; a through hole is formed in the first annular cavity; the lower section of the extending section movably penetrates through the through hole so as to be connected with the plurality of springs II; a second annular cavity is arranged on a main body of the conical barrel II; a plurality of springs I are arranged on the bottom part of the second annular cavity; an annular hole is formed in the second annular cavity; the small-diameter section of the conical barrel I movably penetrates through the annular hole so as to be connected with the plurality of springs I. According to the drilling assistant tool applied to the hanging bar installation procedure provided by the invention, operating personnel can conveniently observe an installation hole drilling progress in real time, concrete dust produced due to drilling is prevented from interfering sights of the operating personnel, and the occurrence of accidents caused by dust splash is prevented.

The invention relates to an opposite-type laser tractor aided navigation control system which comprises a laser sensor emitting end, a laser sensor receiving end, a navigation indicating terminal and a control core. A laser emitter used by the laser sensor emitting end and a laser receiver used by the laser receiving end are arranged on the same horizontal plane. The laser receiver points to the laser emitter. The emitting end deflects synchronously along with front wheels of a tractor, and meanwhile the laser emitter rotates at a constant speed with a stepping motor. The navigation indicating terminal is used for indicating tractor off-course information. STM32 is used as a main control chip of the control core, the tractor off-course information is judged by obtaining the time interval between two-time level signal changing of the laser receiver, and the navigation indicating terminal is controlled to display an off-course angle in a pointer-deflection mode. Based on a laser sensor and a single chip microcomputer control technology, straight line navigation auxiliary control during a tractor running process is achieved, compared with navigation control systems such as a GPS, cost is lower, and tractor working accuracy and efficiency can be effectively improved.

The invention discloses a negative-pressure device with a pressure display function. The negative-pressure device comprises a hollow cavity body provided with a negative-pressure inner cavity and a closed device positioned at an opening of the hollow cavity body, and is further provided with a negative-pressure display device used for displaying negative pressure in the hollow cavity body. The negative-pressure device with the pressure display function can display a negative pressure situation in the hollow cavity body in real time through the negative-pressure display device arranged in or on the hollow cavity body, so that medical personnel can conveniently observe whether the negative-pressure device is in an effective state or not and the nursing workload of the medical personnel can be reduced; the negative-pressure device is used in the field of negative-pressure devices.