298 results about "Microcomputer control" patented technology

The invention provides a wide-voltage intelligent control large-current contactor. Comprising a wide voltage control module which is composed of a rectifier bridge, a voltage acquisition module, a single-chip microcomputer control system and a DCDC conversion module and is used for converting input AC / DC voltage into stable 24VDC output; the wide-current control module is used for controlling the coil to start, the contactor can be in a working state even if power failure occurs, the stability of a power grid is ensured, and the device can be applied to the fields of uninterruptible power supply control cabinets, photovoltaic energy storage, power grid distribution and the like.

The invention discloses a food safety pretreatment and detection device and method, and relates to the technical field of food detection.The device comprises a box body, a control module, a pretreatment module and an ATP biological fluorescence detector, the control module is integrated on the box body, and the pretreatment module is integrated on the box body; the control module comprises a microcomputer control system, a visual operation panel, a nixie tube display and a key regulator; the pretreatment module comprises a concentrator for purging and concentrating a sample, a centrifugal machine for separating the sample, a uniform mixing instrument for uniformly mixing the sample and a water bath kettle for performing constant-temperature incubation on the sample; the ATP biological fluorescence detector is integrated in the box body and is used for carrying out microbial pollution detection on the food contact surface; the control module is suitable for adjusting and controlling operation parameters through the key adjuster when any unit in the concentrator, the centrifugal machine, the blending instrument or the water bath kettle operates, and the operation parameters are displayed on the visual operation panel in real time. The invention further provides a detection method, and on-site, rapid and intelligent food safety detection is achieved.

The invention provides an optimization control method for improving the energy efficiency ratio of the load of a multi-machine-head water chiller-heater unit, which comprises a first compressor system, a second compressor system and a control cabinet, the first compressor system and the second compressor system are both provided with corresponding power meters and microcomputer control modules, and the power meters and the microcomputer control modules are used for detecting the system power. The system further comprises an evaporator, a condenser, a temperature sensor, a flow meter and a pressure sensor, the temperature sensor, the flow meter and the pressure sensor are arranged on corresponding pipelines, the temperature sensor, the flow meter and the pressure sensor are all connected with the microcomputer control module, and differential loading and unloading strategies are adopted according to the load difference of the compressor. The operation parameters corresponding to the optimal COP are screened through multi-cycle iteration, and energy efficiency maximization under partial loads is achieved. The problem that in the prior art, when a multi-machine-head unit runs in a partial load mode, the energy efficiency is low due to lack of fine coordination control is solved, and the energy-saving potential of the unit is remarkably improved.

The invention relates to the technical field of fatigue detection, and discloses a microcomputer-controlled fatigue test device which comprises a workbench, a turntable and a limiting mechanism are installed on the workbench, the turntable is driven to rotate, the limiting mechanism is fixedly connected to the workbench and located in a hole in the center of the turntable, and a swing mechanism is installed on the turntable. The swing mechanism is installed at the eccentric position of the rotating disc, a first installation block capable of swinging is arranged on the swing mechanism, the first installation block extends to the position over the limiting mechanism, one end of a cable to be detected is installed on the first installation block, and the other end of the cable to be detected is installed on the limiting mechanism; through cooperation of the swing mechanism and the rotating disc, the cable is initially vertically arranged, and the swing mechanism and the rotating disc can drive the vertically arranged cable to carry out torsion test, bending test and bending and torsion superposition test, so that the detection of the cable can better fit the use environment of the cable; and the accuracy of data testing is improved.

The invention provides a multi-sensor adaptive anti-interference working well environment detection system and method, and the system comprises a single-chip microcomputer control panel, a temperature and humidity monitoring sensor, a four-in-one combustible gas detector, a dust particle detector, a differential pressure transmitter, and a cloud server. The temperature and humidity monitoring sensor, the four-in-one combustible gas detector, the dust particle detector and the differential pressure transmitter are in circuit connection with the single-chip microcomputer control panel, the single-chip microcomputer control panel is in wireless communication with the cloud server, the detection method dynamically adjusts the weight distribution of the sensor through the feature level attention module, a lightweight neural network and a hard redundancy check rule are combined, and the detection accuracy is improved. Compared with the prior art, the method has the advantages that the low false alarm rate is kept, the model size is low, and the method is suitable for industrial field deployment.

The utility model belongs to the technical field of switching power supplies, and relates to a single-chip microcomputer control-based battery internal resistance detection circuit, which is characterized in that a single-chip microcomputer I / O1 port and a single-chip microcomputer I / O2 port respectively give high-level control signals in an extremely short time to control the discharge of a battery, when a power supply starts a battery internal resistance detection function, firstly, the I / O1 is made to be at a high level, Q13 is conducted, PC1A is conducted, and the Q13 is turned on; the secondary side PC1B of the optocoupler is conducted, the Q12 is driven, the battery is subjected to large-current discharging through the R61 and the Q12, the voltage at the two ends of the battery is tested to be U1, I / O1 and I / O2 are conducted at the same time after millisecond-level discharging is conducted, the R61 and R65 start parallel discharging at the moment, the voltage U2 at the two ends of the battery can be obtained, and the voltage U2 of the two ends of the battery can be obtained through the voltage difference value and the current difference value of two times of measurement. According to the utility model, the internal resistance of the battery can be easily calculated according to the Ohm law, and the problems that the internal resistance test of various batteries is inaccurate on the premise of different discharge curves, and the internal resistance test precision of the battery is influenced by the height of discharge platforms of different batteries due to the increase of the internal resistance of the battery can be solved.

The invention relates to a visual on-load voltage regulation tap switch control system, device and medium, which comprises a single chip microcomputer control circuit, the single chip microcomputer control circuit is connected with a signal processing circuit and a power supply circuit, and the signal processing circuit is connected with a voltage zero cross detection circuit, a voltage sensor and a data acquisition unit. The voltage zero-cross detection circuit, the voltage sensor, the data acquisition unit and the power supply circuit are all connected with the isolation reduction transformer, and the isolation reduction transformer is connected with the low-voltage side voltage of the distribution transformer; the single-chip microcomputer control circuit is further connected with a switch position sensor, a communication circuit, a switch drive circuit and a thyristor trigger circuit. The communication circuit is in communication connection with a remote computer through an RS485. The method has the advantages of realizing automatic voltage regulation conversion, stabilizing voltage, accurately setting visual parameters and realizing non-impact voltage regulation.

The utility model discloses a photodiode dark current testing device, comprising an LED lamp, a light shield, a dual-channel power supply, a desk type universal meter, a one-chip microcomputer control board and a multi-channel test board, the light shield is covered on the multi-channel test board, the multi-channel test board is provided with PD sockets having the same number as the channels of the multi-channel test board, and the PD sockets are connected with the desk type universal meter. The PD socket is composed of a 4P socket and Y-shaped sockets arranged side by side. After the scheme is adopted, the efficiency is greatly improved through multi-channel testing, and the vertical pins can be automatically tested through the design of the Y-shaped socket.

The invention discloses a control starting system of a hybrid mower. Relates to the field of generators and solves the problem that an existing mower is highly dependent on a storage battery. The generator is started through a pull disc, the output end of a charging coil of the generator is connected with a generator rectification module, alternating current is converted into direct current, then the direct current is transmitted to a power supply DC-DC conversion module, and the direct current is supplied to a single-chip microcomputer and a driving execution unit through voltage stabilization processing and charges a storage battery. The auxiliary power supply module receives the rectified direct current and converts the rectified direct current into multi-level stable low-voltage power to meet various peripheral requirements; the generator rotating speed acquisition module acquires and converts rotating speed signals and provides data support for single-chip microcomputer control. When the storage battery is normal, the system can be started to operate, the power supply DC-DC conversion module replaces a traditional rectifier to charge the storage battery, and continuous operation is guaranteed; and when the storage battery is lack of electricity or damaged, after the pull disc starts the generator, the rectification module, the DC-DC conversion module and the auxiliary power supply module work cooperatively, so that operation interruption is avoided, and the emergency operation capability is improved.

The invention discloses an intelligent real-time dynamic precise laser weeding method and device, and relates to the field of laser weeding, and the weeding device comprises an image acquisition module, a processor, a laser reflector, a single-chip microcomputer control module, an IMU sensor, a high-precision encoder and the like. Wherein the image acquisition module is used for acquiring field crop and weed images, the processor processes the acquired crop and weed images based on an LW-YOLO model, extracts weed position coordinate information, and performs optimal planning on a laser scanning path; the laser reflector is used for controlling the laser to irradiate a target position through the rotation of the laser reflector; the single-chip microcomputer control module is used for controlling the phase voltage of the brushless motor, transmitting a command issued by the processor to the sensor and the execution mechanism, and improving the positioning precision of the motor through an FOC algorithm. The weeding precision and efficiency are remarkably improved, the waiting time during static weeding is shortened, and the advantages of high precision and high efficiency are achieved.

The invention discloses an automobile seat temperature control system based on a single chip microcomputer. Temperature adjustment on the surface of an automobile seat is achieved through a semiconductor refrigeration technology. The system comprises a single-chip microcomputer control module, a temperature measuring circuit, a temperature setting and displaying circuit, a semiconductor chilling plate driving circuit and a PID control algorithm. The temperature measuring circuit reads the current seat temperature through a digital temperature sensor and adjusts the working state of the semiconductor chilling plate through a PID control algorithm to reach the set target temperature. The system solves the problem that a traditional automobile seat is uncomfortable to sit due to heat insulation, the thermal comfort of passengers can be remarkably improved, and the system is environmentally friendly and efficient.

The utility model discloses a kind of optical multi-channel gas sensors based on NDIR principle, it is related to infrared gas sensor technical field;By infrared light source, air chamber, four-channel thermoelectric detector composition infrared absorption light system, light source voltage stabilizing modulation circuit, thermoelectric weak signal conditioning circuit, high-precision analog-digital conversion circuit, single-chip microcomputer control and communication circuit system composition, the utility model realizes compact structure, the function of the real-time measurement of multiple gas;Realize low-noise zero drift self-stable signal processing circuit, design low-power 24-bit sampling circuit, accurate real-time digital signal can be obtained without complex data processing algorithm, the utility model design has the characteristics such as wide range, high precision, good stability, long life, miniaturization, simultaneously replace sensor end can measure multiple types of gas, solve the problem that traditional infrared optical gas sensor is high in cost, bulky inconvenient to carry, detection result is time-consuming long precision is susceptible to environmental interference.

1. The name of the design product: microcomputer control electronic universal testing machine (300KN). 2. The use of the design product: the design is used for testing the mechanical properties of various non-metals, metals and composite materials. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

To provide a battery monitoring system, a battery monitoring device, and a voltage measurement device that can reduce a synchronization shift in measurement timing.SOLUTION: A battery monitoring system according to an embodiment includes: a current measurement device that measures a current in a battery to output a current value; a voltage measurement circuit that measures a voltage in the battery; a first microcomputer that controls the voltage measurement circuit; a voltage measurement device including a first wireless communication unit that wirelessly outputs a measured voltage value; a second wireless communication unit that wirelessly communicates with the first wireless communication unit; and a battery monitoring device including a second microcomputer that receives the current value and the voltage value. The second microcomputer outputs a current measurement request signal to the current measurement device after the lapse of a first time based on an output signal from the second wireless communication unit. The first microcomputer exerts control such that the voltage measurement circuit measures the voltage after the lapse of a second time synchronized with the first time based on an output signal from the first wireless communication unit.SELECTED DRAWING: Figure 2B

The invention discloses an air detection and purification device based on single-chip microcomputer control, and relates to the technical field of air detection and purification, the air detection and purification device comprises an inner box fixedly connected to the inner wall of a box body, a partition plate fixedly connected to the inner wall of the inner box, and a filtering mechanism located on the partition plate; the filtering mechanism comprises a swinging water spraying unit, a replacing unit, a feeding unit and a discharging unit. Through the arrangement of the replacement unit, a motor drives a reciprocating screw rod to rotate, the reciprocating screw rod rotates to drive a reciprocating shaft sleeve to reciprocate, when the reciprocating shaft sleeve moves towards the motor, the reciprocating shaft sleeve moves a fixed block and a rotating block to move, and when the rotating block makes contact with a strip-shaped block, the rotating block drives a rotating frame to rotate through the strip-shaped block; and the rotating frame rotates to drive the filtering barrel to rotate until the rotating frame and the filtering barrel stop rotating, so that the prepared activated carbon is automatically replaced, and the air purification effect is improved.

The utility model relates to the technical field of microelectronic processing, in particular to a circuit board dispensing and drying device for microelectronic processing, which comprises a bottom plate, a first support plate, a second support plate, a first through groove, a baking lamp, a storage battery, a temperature sensor and a single chip microcomputer. The temperature of the baking lamp is increased, so that the temperature of a cavity formed among a first connecting plate, a first supporting plate and a second supporting plate is increased, and when the temperature is increased to a threshold value of a temperature sensor, the single-chip microcomputer reduces discharge of the storage battery to the baking lamp, so that the temperature in the cavity is stably kept at a proper temperature for drying the circuit board; then the circuit board is placed on the conveying belt and driven by the first motor to enter the cavity, so that drying of the circuit board is achieved, the scheme that the circuit board is dried through the baking lamp can effectively avoid the problem of glue position deviation occurring when an air heater is used for drying, and therefore the drying effect of the device on the circuit board is improved; and the subsequent maintenance cost of the circuit board is reduced.

The utility model relates to the technical field of color printing carton processing, in particular to an auxiliary fixing mechanism for color printing carton processing, which comprises two symmetrically arranged racks, two sliding rods parallelly mounted between the two racks, a plurality of pressing frames equidistantly mounted on the two sliding rods and rubber pressing rollers rotatably mounted on two sides of the lower ends of the pressing frames. And a transverse frame is fixedly connected between the middle parts of the upper ends of the two racks. According to the automatic correction device, an original auxiliary fixing mechanism is scientifically and reasonably improved, and the transverse frame, the rotating rod, the transmission connecting rod, the transmission sliding column, the servo motor, the image acquisition module and the microcomputer controller are arranged between the rack and the two sliding rods, so that automatic correction operation can be carried out on a color printing paperboard in the auxiliary fixing process; according to the auxiliary fixing mechanism, the color printing paperboards can be quickly adjusted to be in a regular state, the problems of deviation, dislocation and the like in the conveying process of the color printing paperboards are effectively reduced, and therefore the functionality and the machining stability of the auxiliary fixing mechanism are improved.

The utility model provides a test fixture for a circuit board of a lifting table, which comprises a bottom table, the bottom table is a hollow box body, and a microcomputer controller is connected in the bottom table. The top surface of the bottom table is connected with a circuit board fixing plate through a spring sliding mechanism, and the top surface of the bottom table is connected with a probe. A pressing device is arranged on the upper side of the circuit board fixing plate and connected to the top face of the bottom table. The top surface of the bottom table is connected with a simulation lifting mechanism; and the simulation lifting mechanism is electrically connected with the microcomputer controller. The device detects the functions of the circuit board of the lifting table, simulates the working state of the lifting table, monitors the working current, the working voltage, the remote control module power supply and the signal power supply, verifies the key functions of the limit switch logic, the operation mode switching and the like, ensures that the lifting table stops in time when reaching the limit position, and evaluates the reliability and the safety of the circuit board.

The invention discloses a silicon controlled rectifier forward and reverse bidirectional switching solid-state module, and aims to solve the problems that an existing silicon controlled rectifier switching scheme is high in short circuit risk, high in cost and complexity and difficult to maintain, and a simple relay replacement scheme is short in service life. According to the technical scheme, the device comprises a hardware circuit structure and a single-chip microcomputer control logic part, the hardware circuit structure comprises a main loop silicon controlled rectifier unit, a relay switching unit, a single-chip microcomputer control unit, a signal acquisition unit and a power supply unit, and a mixed topological structure of three main loop silicon controlled rectifiers and a common double-pole double-throw relay is adopted. And in cooperation with closed-loop control logic of load state judgment, silicon controlled rectifier turn-off, relay switching and silicon controlled rectifier conduction, current forward and reverse safe switching is realized. Two silicon controlled rectifiers for switching are omitted, so that the risk of short circuit is thoroughly avoided; the relay is switched only when the silicon controlled rectifier has no output, so that the service life is prolonged; the circuit structure is simplified, the hardware and maintenance cost is reduced, and the anti-interference capability is remarkably improved.

1. The name of the design product: microcomputer control panel with comprehensive protection graphical user interface. 2. The use of the design product: used for microcomputer control panel, mainly applied to electrical cabinet and power distribution cabinet products. 3. The design points of the design product: the interface content of the graphical user interface in the screen. 4. The picture or photo that best indicates the design points: front view. 5. The design points are in the graphical user interface, and other views are omitted. 6. The use of the graphical user interface: the graphical user interface is used to realize the man-machine interactive operation of the setting function of the microcomputer comprehensive protection device. 7. The change state description of the graphical user interface: the display screen displays the front view when normally powered on, in this state, click the menu, the graphical user interface switches to change state figure 1, when the fault alarm information is generated, the event report is red; click the setting button in change state figure 1, the graphical user interface switches to change state figure 2; click the setting modification in change state figure 2, the graphical user interface switches to change state figure 3.

The utility model discloses water-saving irrigation equipment capable of preventing water source evaporation, which relates to the technical field of structures capable of preventing water source evaporation and comprises a water storage barrel, a water inlet blocking cover arranged at the upper end of the water storage barrel, a water level display component arranged at the side end of the water storage barrel, a water drainage component arranged at the lower end of the outer wall of the water storage barrel and a support frame welded at the bottom end of the water storage barrel. Through cooperation of the stirring impeller and the water discharging assembly, materials such as additives can be better scattered and mixed into water liquid, the water discharging speed is prevented from being regulated and controlled, and therefore the functions of mixing the material liquid and regulating and controlling the irrigation water flow are achieved; the water inlet blocking cover can be blocked, and then the functions of water level detection, rainwater collection controlled by a single chip microcomputer and evaporation loss prevention can be achieved; finally, the problem that evaporation loss is serious when an existing water source storage device achieves the rainwater collection function is solved.

The invention discloses a relay for controlling a reversing fan by an agricultural machine engine, which is characterized in that a first control signal end and a second control signal end in an ECU (Electronic Control Unit) interface unit are respectively used for receiving a first control signal and a second control signal output by an ECU, and the first control signal and the second control signal are respectively used for triggering the fan to rotate forwards and backwards; the control circuit is used for carrying out voltage division and filtering processing on the first control signal and the second control signal; the single-chip microcomputer control unit is used for receiving the signal processed by the control circuit, analyzing the signal to judge the water temperature interval of the engine and executing corresponding sequential logic of forward and reverse rotation of the fan according to the water temperature interval, and the single-chip microcomputer control unit is integrated with a failure protection function; and the driving execution unit is electrically connected with the single-chip microcomputer control unit and used for switching forward rotation and reverse rotation of the fan according to the instruction of the single-chip microcomputer control unit, and the driving execution unit comprises a relay contact group and is used for selectively switching on a forward rotation loop or a reverse rotation loop of the fan.

The utility model provides an early warning device for a cable well, belongs to the technical field of cable safety, and aims to solve the problem of poor contact of cable joints monitored on line at present. At present, a detection method mainly detects the temperature of a cable joint, but the actual situation is that the temperature of a cable is obviously increased under the conditions of long time and large load current when the temperature is detected, so that the poor contact of the cable is detected, and the poor contact of the cable joint cannot be effectively monitored. The device comprises a single-chip microcomputer, a power supply module, a cable joint impedance module and an alarm module, wherein the cable joint impedance module and the alarm module are electrically connected to the single-chip microcomputer; the power supply module supplies power to the single-chip microcomputer, the cable joint impedance module and the alarm module. The cable joint impedance module is used for detecting the voltage of a cable joint of two mutually connected cables, generating a signal of the cable joint and feeding back the signal to the single chip microcomputer; the single-chip microcomputer controls on and off of the alarm module according to a signal of the cable joint.

The present application relates to a kind of for aircraft stop washer beating method and automation beating special tool, belong to aircraft assembly technical field.The beating method of stop washer provided by the present application provides a kind of for aircraft stop washer beating automation beating special device, the application of this device realizes the automation beating of stop washer, and automation beating can reduce the influence of artificial state on the beating quality of stop washer, and using revolution sensor and single-chip microcomputer control can guarantee that beating meets the requirements once, without repeating bending to stop washer lug, avoid violating process discipline.This stop washer automation beating device is simple in structure, relatively small in size, easy to carry, and single person can complete operation, and its beating process uses rotation servo motor and telescopic motor to realize beating process, which can reduce the labor intensity of operator, enhance the connection reliability and safety of bolt, enhance customer satisfaction.

The application provides an electronic horn with electrical waterproof function for electric bicycle, wherein a single-chip microcomputer collects a K1 switch state signal under the condition that the power supply is powered on after the whole vehicle is locked, and the single-chip microcomputer controls NMOS switch to drive the transformer primary coil switch energy storage according to the collected signal, and the transformer secondary side drives the vibration energy release of the horn after voltage conversion. The application has the beneficial effects that: the electronic horn with electrical waterproof function for electric bicycle separates the power supply and control signal of the electronic horn to achieve the waterproof function, the switch signal of the horn is directly collected by the single-chip microcomputer through a current-limiting resistor and a triode, and the switch signal has the waterproof ability through reasonable parameter matching, so that the horn does not appear false ringing or failure after raining, and the user can have stable and reliable use experience.

The application discloses a high-frequency electromagnetic wave bidirectional regulation and control sympathetic nerve activity hypertension treatment device, which comprises a master control box, a movable mechanical arm, an irradiation assembly, a sensor assembly and a power distribution assembly; a single-chip microcomputer control unit and a radio frequency generating circuit are arranged in the master control box, and the power distribution assembly is arranged in the master control box; one end of the movable mechanical arm is fixed to the master control box, and the other end is connected with the irradiation assembly; the irradiation assembly is connected with the radio frequency generating circuit; the sensor assembly is connected with the single-chip microcomputer control unit, is used for collecting physiological information, feeds back to the single-chip microcomputer control unit and adjusts radio frequency output parameters. The application can realize accurate directional irradiation of high-frequency electromagnetic waves on a target sympathetic nerve region, combines physiological information, dynamically adjusts radio frequency output parameters in real time, and improves the accuracy, stability and individual adaptability of sympathetic nerve regulation.

A method for optimizing electromagnets using a microcontroller control circuit is proposed. The microcontroller outputs a low-level signal for a certain duration after power-on, causing the electromagnet's coil to approach the power supply voltage. During this duration, the electromagnet is attracted. After this duration, a PWM oscillation wave is output, causing the MOSFET Q2 to continuously turn on and off. A pulse signal with a duty cycle is applied to the coil. The power consumption generated by the current flowing through the electromagnet's coil during the PWM oscillation wave output is less than that under a 100% duty cycle. For electromagnets of the same specifications, different PWM oscillation waves are output by writing different program parameters into the microcontroller. With the electromagnet in its closed-state state, a PWM pulse with a variable duty cycle is applied to the coil, allowing the same electromagnet to exhibit different attracting forces in different application scenarios. This method improves the adaptability of the electromagnet to various environments.

A method for efficiently improving the microwave sterilization efficiency of packaged food adopts a conveyor belt tunnel type microwave treatment box to treat the packaged food, the conveyor belt tunnel type microwave treatment box comprises a heating section and a constant-temperature sterilization section, the two sections are respectively provided with magnetrons (microwave tubes) with different numbers according to actual requirements, and a plurality of microwave feed inlets and a plurality of temperature measurement control points are reasonably arranged; the temperature rise section is controlled to gradually rise from the original temperature to the set sterilization temperature of 50-95 DEG C, and the constant-temperature sterilization section is subjected to temperature measurement and temperature control, so that microwave heating and cooling are in a dynamic balance state, the microwave power is automatically reduced when the temperature rises, and the microwave power is automatically increased when the temperature drops; the product in the constant-temperature sterilization section is always in a set temperature range of + / -2 DEG C, and the temperature control aims to measure the product temperature at the temperature measuring point and control the product temperature in the set temperature range; and each temperature measuring point is provided with an infrared temperature measuring probe and a microcomputer control system.

The application discloses a microcomputer-controlled electro-hydraulic servo bridge expansion device testing machine, which comprises a base, a detection platform and a detection device. The base is provided with transverse sliding rails, longitudinal sliding rails and at least two groups of movable gantries. The detection platform comprises a first platform and a second platform. The first platform is provided with a vertical misalignment cylinder between the first platform and the transverse sliding rails. The second platform is provided with a misalignment turntable rail between the second platform and the longitudinal sliding rails. The detection device comprises transverse detection devices, longitudinal detection devices and vertical detection devices. The transverse detection devices can exert a transverse load on the first platform. At least two longitudinal loading cylinders of the longitudinal detection devices can independently exert a longitudinal load on the second platform. A plurality of vertical loading cylinders of the vertical detection devices can independently exert a vertical load on different parts of the bridge expansion device. The application can simulate longitudinal inclination, vertical inclination, transverse misalignment and multi-directional composite deformation conditions, and comprehensively detect the sealing performance, fatigue life and structural reliability of the bridge expansion device.

The utility model relates to the technical field of air detection equipment, and provides air quality detection equipment which comprises a packaging shell, and a control circuit board is arranged in the packaging shell; the control circuit board is provided with a plurality of sensors used for detecting air quality in a classroom, the control circuit board comprises a power supply circuit, a 4G communication module circuit, a sensor acquisition circuit, a Bluetooth interface circuit, an expansion single-chip microcomputer control circuit and a main single-chip microcomputer control circuit, and the power supply circuit supplies power to the control circuit board; the 4G communication module circuit, the sensor acquisition circuit and the extended single-chip microcomputer control circuit are respectively connected with the main single-chip microcomputer control circuit, thereby realizing acquisition of classroom air quality and providing a data basis for effective monitoring of the classroom air quality.