58results about How to "Guaranteed working temperature" patented technology

The invention discloses a large-scale outdoor sound box, and relates to the technical field of outdoor sound boxes, the large-scale outdoor sound box comprises an outdoor sound box and a sound outlet grating, the sound outlet grating is fixedly connected to the outdoor sound box, the outdoor sound box is provided with a rain shielding assembly, the rain shielding assembly comprises a fixing rod, and the fixing rod is fixedly connected to the top surface of the outdoor sound box; the waterproof rolling cloth shields the side, away from the outdoor sound box, of the sound outlet grating, the sleeve box and the waterproof rolling cloth form a closed cavity, the sound outlet grating is isolated from the external rainstorm environment, and the situation that under continuous impact and invasion of rainwater in the rainstorm environment, the sound outlet grating will become a channel for rainwater to permeate into the outdoor sound box is avoided; the outdoor sound box is simple in structure and convenient to use, ensures use safety of equipment of key components such as a loudspeaker and a circuit in the outdoor sound box, ensures normal work of the outdoor sound box, can avoid the problems that metal components rust and plastic components age due to the fact that rainwater makes contact with the sound outlet grating and the components in the outdoor sound box, and ensures the service life of the outdoor sound box.

The invention discloses a housing construction project hollowing detection device which comprises a shell, a mounting cavity is formed in the shell, a transmission shaft is rotatably mounted in the mounting cavity, a mounting plate is fixedly mounted on the lower surface of the mounting cavity, an eccentric pressing block is fixedly mounted on the surface of the transmission shaft, and a pressing column is slidably mounted in the mounting plate. Knocking heads are slidably mounted at the bottom of the pressing column, a sound sensor module fixedly mounted on the mounting plate is arranged on one side of each knocking head, a rotating shaft is rotatably mounted in the mounting cavity, a cleaning roller is fixedly mounted on the surface of the rotating shaft, and one end of the rotating shaft is in transmission connection with the transmission shaft through a transmission assembly. When knocking sound is detected through the sound sensor module and hollowing sound is detected, the control device controls the corresponding electromagnetic pump to work and marks the hollowing position, the hollowing position can be accurately marked and detected, meanwhile, the cleaning roller is driven to rotate, dust on the detection face is swept forwards, and the detection effect is improved.

The invention discloses a Dewar device for measuring in a single-module differential chip of an infrared detector and a manufacturing method of the Dewar device. The intermediate measurement Dewar device comprises a Dewar assembly and a chip assembly, the chip assembly comprises a single-module chip component and a differential chip component, and the Dewar assembly comprises a first cold table, a cold finger, a second cold table and a third cold table; the single-module chip component is adhered to the second cooling table, the differential chip component is adhered to the third cooling table, the first cooling table is glued with the second cooling table, the cold finger is fixed on the first cooling table through a brazing process, and the surface temperature of the first cooling table is a first preset temperature; a boss is arranged at the preset position of the cold finger, the third cold table is in glue joint with the boss, and the preset position is the distribution position corresponding to the second preset temperature in the simulated temperature gradient distribution on the cold finger. According to the embodiment of the invention, the performance test of the chip with the secondary processing capability can be realized, and the working temperatures corresponding to the single-module chip and the differential chip can be ensured.

The utility model discloses a fiber bragg grating demodulator, which comprises a shell, and a laser, an optical path module, a driving circuit, a main control circuit and a bracket which are arranged in the shell. The light path module is connected with the laser, the driving circuit and the external grating, the light path module is used for transmitting laser generated by the laser to the external grating and receiving reflected light reflected by the external grating, and the driving circuit is connected with the laser and the main control circuit. The driving circuit is used for driving the laser, converting reflected light into digital signals and transmitting the digital signals to the master control circuit, and the master control circuit is connected with the driving circuit to control the driving circuit. The fiber bragg grating demodulator of the utility model can realize integrated installation in a 3U case of a train, realizes rapid access of equipment, and solves the adaptability problems of voltage resistance, insulation, EMC electromagnetic compatibility and the like on the train. The wireless design is adopted except the optical fiber, so that inaccurate measurement and device damage caused by impact and vibration can be effectively avoided.

The invention discloses a constant-pressure variable pump working load simulation device and method. The constant-pressure variable pump working load simulation device comprises an oil tank, a tested constant-pressure variable pump, a driving motor, a controller, a flow sensor I, a proportional throttle valve, a pressure sensor I and a pressure sensor II. An oil suction port of the tested constant-pressure variable pump is communicated with the oil tank through an oil suction pipeline; a pressure sensor II is arranged on the oil suction pipeline; the oil outlet pipeline is sequentially provided with a pressure sensor I, a flow sensor I and a proportional throttle valve; oil is sucked in through the oil suction port and extruded out of the oil outlet, the oil outlet is communicated with the oil tank through the oil outlet pipeline to form an oil circulation closed loop, and working pressure is formed. The controller is used for receiving and processing the data information and converting the data information into a command signal, and the controller sends the command signal to the proportional throttle valve; the proportional throttle valve changes the load flow of the tested constant-pressure variable pump in real time by adjusting the opening degree of a valve port of the proportional throttle valve according to the command signal. The performance test and the durability test of the constant-pressure variable pump under the actual load working condition can be simulated.

The application discloses a handheld dust collector motor drive algorithm circuit heat dissipation integrated system and relates to the technical field of control systems.The system comprises a temperature acquisition module, an operating parameter acquisition module, a thermal distribution prediction module, an active thermal management control module and an adaptive adjustment module.The application combines multi-point temperature acquisition with a three-layer structure thermal distribution prediction model to comprehensively acquire the real-time thermal state of multiple key heating elements in the motor drive circuit, simultaneously considers the bidirectional heat conduction relationship between the elements, accurately calculates the net heat power of each element, and further generates a temperature prediction curve in a future time period.The method can comprehensively reflect the overall thermal distribution of the circuit, avoid the limitations caused by single-point detection, eliminate the influence of heat transfer between the elements on temperature prediction through heat conduction coupling calculation, realize early prediction of thermal risks, and provide reliable decision basis for active thermal management.

The utility model provides a hybrid electric vehicle energy recovery device which comprises a heat dissipation assembly, and the heat dissipation assembly comprises a radiator, a liquid outlet pipe, a circulating pump, a liquid conveying pipe, battery cooling fins, motor cooling fins, a flowing pipeline, a liquid inlet pipe, cooling fins, a cooling fan and a controller. And the lower part of one side of the radiator is communicated with two liquid outlet pipes. According to the utility model, through automobile braking or deceleration, the generator can respond quickly and convert mechanical energy into electric energy to be stored in the battery pack, so that the energy recovery efficiency is improved, the improvement of the fuel economy of the hybrid electric vehicle is facilitated, and the heat dissipation efficiency of the hybrid electric vehicle is improved through the combination of cooling liquid circulation and fan heat dissipation. Therefore, heat generated by the generator and the battery pack is effectively dissipated, normal working temperature is guaranteed, performance reduction and service life shortening of equipment are avoided, connection of the generator is disconnected through control of the electromagnetic clutch when electric quantity of the battery pack reaches a certain level, and safety problems caused by overcharge of the battery are avoided.

The invention relates to a space optical camera focal plane and electric control assembly and an assembly process method thereof, in particular to a space optical camera focal plane and electric control assembly capable of preventing molecular contamination of an electronic assembly to a detector target surface and an assembly process method thereof. The problem that an existing assembly is difficult to meet the detector target surface molecular pollution protection requirement and the space load integration requirement at the same time is solved. The assembly comprises a focal plane assembly and an electric control assembly from front to back. The focal plane assembly comprises a front panel, a focal plane assembly shell which forms a cavity with the front panel, and a detector welding front assembly, a focal plane circuit board and a heat transfer plate which are arranged in the cavity from front to back; the detector welding front assembly comprises a detector base, a detector pressing plate and a detector arranged in an inner hole of the detector base from back to front; the rear end surface of the detector and the step surface of the inner hole of the detector base as well as the front end surface of the detector welding front assembly and the front panel are peripherally sealed; the electric control assembly shell and the focal plane assembly shell define a communicated cavity.

The utility model discloses a prefabricated box-type transformer station with a rainproof function, comprising a base plate, the base plate is provided with a prefabricated assembly, the prefabricated assembly comprises a groove, a middle block, a middle plate surface, a water collection tank hole, a cable hole, a ladder stand and a top block, the groove is arranged on the base plate, the base plate is detachably connected with the middle block through the groove, and the middle plate surface is provided with a plurality of cable holes. A groove is formed in the bottom plate, a middle plate face is arranged in the middle of the groove, a water collecting groove hole is formed in the bottom plate, a cable hole is formed in the side wall of the middle block, and a ladder stand is arranged on the inner side of the middle block. In the using process, the middle block is placed in the groove in the bottom plate, the top block is placed at the top of the middle block, and a cable penetrates through the cable hole in the middle block manually; personnel climb along the crawling ladder in the operation process, water flow flowing into the bottom plate finally flows into the water collecting groove holes to be converged along the middle plate face, and therefore the technical problem that in the background technology, water is likely to accumulate in a prefabricated box-type substation foundation, and power supply and distribution safety of a box-type substation is affected is solved.

The application discloses a novel overspeed protection device, which comprises a device body, wherein the device body comprises a base, a support device, an assembling table, a terminal mounting table, a terminal box and a protection device; the support device is provided in one group, and the support device is fixed on the top of the base through welding; the assembling table is fixed on the top of the support device through welding; the terminal mounting table is fixed on the front end of the assembling table through screws; the terminal box is fixed on the terminal mounting table through screws; and the protection device is installed on the top of the assembling table; the protection device comprises an integrated block, a first electromagnetic valve, a second electromagnetic valve, a hydraulic control reversing valve, a safety oil pipe, a pressure oil pipe, an oil return pipe, a pressure switch and a pressure gauge. The device can more accurately control the flow direction and pressure of oil, can quickly and accurately perform protection actions such as safety oil unloading when abnormal conditions such as overspeed occur, and can guarantee the safe operation of equipment and improve safety.

This utility model relates to the field of microwave technology and discloses a microwave transmitter module, including a metal housing, an internal base plate, an L-shaped plate on the base plate, fixing bolts on the L-shaped plate, and several positioning holes on the upper side of the base plate. A transmitting assembly is mounted on the base plate, an antenna is mounted on the right side of the metal housing, and a mounting assembly is located on the front side of the metal housing. An inner shielding layer is installed inside the metal housing, and an outer shielding layer is located inside the inner shielding layer. Heat dissipation fins are mounted on the upper side of the metal housing. In this utility model, by adjusting the position of the L-shaped plate, microwave oscillators of different lengths can be quickly and accurately installed and fixed, meeting diverse usage needs. Furthermore, the disassembly process is clear during microwave oscillator maintenance, greatly improving maintenance efficiency.

The invention discloses a large-scale outdoor speaker, which relates to the technical field of outdoor speakers and comprises an outdoor speaker and a sound grille. The sound grille is fixedly connected to the outdoor speaker. A rain shielding component is arranged on the outdoor speaker, and the rain shielding component comprises a fixing rod, which is fixedly connected to the top surface of the outdoor speaker. The sound grille is shielded away from one side of the outdoor speaker by a waterproof roll cloth, and a casing and the waterproof roll cloth form a closed cavity, which isolates the sound grille from an external rainstorm environment, and prevents the sound grille from becoming a channel for rainwater to penetrate into the outdoor speaker under the continuous impact and invasion of rainwater in the rainstorm environment, thereby ensuring the safety of key components such as speakers and circuits inside the outdoor speaker, and ensuring the normal operation of the outdoor speaker. At the same time, it can prevent the problem of rusting of metal components and aging of plastic components caused by rainwater contacting the sound grille and internal components of the outdoor speaker, thereby ensuring the service life of the outdoor speaker.

The utility model discloses a kind of optical transmission equipment air-cooled heat dissipation box equipment, including heat dissipation box pedestal, the left and right sides of heat dissipation box pedestal upper surface are fixedly connected with heat dissipation side plate, two the heat dissipation side plate upper surface middle is provided with dynamic heat dissipation mechanism, the utility model is provided with dynamic heat dissipation mechanism, when optical transmission equipment works, first motor starts, drive screw rod rotates, the rotation of screw rod drive screw slide block along screw rod moves forward or moves backward, in this process, by second motor drive suction fan blade rotation, heat is discharged through suction fan blade, so that optical transmission equipment heat dissipation carries away heat, maintains equipment normal working temperature, and by dynamic heat dissipation mechanism makes movable arm together with suction fan blade moves, different positions of optical transmission equipment body can be heat dissipated, to avoid that optical transmission equipment body side edge position cannot be effectively heat dissipated.

The invention relates to the technical field of equipment measurement, and provides a thermal noise control-based measurement precision improvement method for electrical safety detection equipment, which comprises the following steps of: acquiring the electrical safety detection equipment for customs detection, and positioning an electronic component to be processed on the electrical safety detection equipment; based on the thermoelectric refrigerating unit, cooling the to-be-processed electronic component; performing heat dissipation treatment on the thermoelectric refrigerating unit; and performing energy consumption management on the thermoelectric refrigerating unit. The electronic component to be processed is cooled according to the thermoelectric refrigerating unit, the working temperature of the thermoelectric refrigerating unit is ensured, thermal excitation motion of electrons can be reduced, noise is lowered, the signal-to-noise ratio of signals is increased, and finally the accuracy and stability of measurement are improved.

The utility model belongs to the technical field of lamps, and particularly discloses a modularized heat dissipation illuminating lamp. The LED lamp comprises a lamp body, a fixed box is arranged in the lamp body, a heat dissipation box is arranged on one side of the fixed box, heat dissipation assemblies are arranged in the fixed box and the heat dissipation box, a detachable assembly is arranged between the lamp body and the fixed box, each heat dissipation assembly comprises a heat dissipation fin, a second bevel gear is arranged on one side of each heat dissipation fin, and the LED lamp can serve as an independent module through the fixed box; the heat dissipation assembly can be detachably assembled with the clamping groove of the lamp body, when the heat dissipation assembly is damaged, only the heat dissipation assembly is replaced instead of the whole lamp body, the maintenance and replacement cost is greatly reduced, and material waste is reduced; and through cooperative work of a plurality of heat dissipation components including the cooling fins, the fan, the impeller and the like, heat generated by electronic elements can be rapidly taken away, the temperature in the lamp body is effectively reduced, stable operation of the illumination lamp is guaranteed, and the service life of the illumination lamp is prolonged.

The utility model provides a heat dissipation device for electromechanical equipment, belongs to the technical field of heat dissipation devices, and solves the technical problems that an existing heat dissipation device is poor in heat dissipation effect on the electromechanical equipment and cannot treat dust generated in work. Two heat dissipation cavities are oppositely formed in the machine body, a heat dissipation assembly is arranged in each heat dissipation cavity, each heat dissipation assembly comprises a semiconductor chilling plate, the semiconductor chilling plates are arranged in the side walls of the heat dissipation cavities, the cold ends of the semiconductor chilling plates are connected with first fans, and the hot ends of the semiconductor chilling plates are connected with second fans. A plurality of heat dissipation holes are formed in the side wall, close to the interior of the machine body, of the heat dissipation cavity, a connecting block is further connected into the machine body, a connecting plate is detachably matched with the connecting block, mounting blocks are arranged on the upper surface and the lower surface of the connecting plate, a plurality of mounting grooves are formed in the mounting blocks, a dust removal cavity is further formed in the top of the machine body, and a plurality of through holes are formed in the surface of the uppermost connecting plate. A dust removal device is further arranged on one side of the machine body.

The invention provides an isolation method for a condensate pump, which relates to the technical field of condensate water of thermal power generating units and comprises the following steps: step 1, stopping the condensate pump connected with a condenser, step 2, closing an outlet door, and step 3, closing an inlet door. And 4, the sealing water manual door is turned down (the sealing water pressure gauge is monitored to be not more than 0.6 MPa, and if the pressure rises, the sealing water manual door is turned down continuously). The problems that a thermal power plant condensation water system breaks down frequently, particularly, a condensation water pump inlet filter screen is blocked frequently and needs to be overhauled frequently, pressure relief water drainage and isolation overhauling are needed in the case of faults, but condensation water pump isolation has great safety risks such as condenser vacuum reduction and condensation water pump inlet pipeline overpressure damage occur are solved.

The utility model relates to the technical field of valves, in particular to a heating drain valve. A heating drain valve comprises an actuator and a valve, the actuator is installed above the valve and used for receiving water adding, water draining, closing and temperature signals, controlling valve opening and closing and outputting valve opening, closing, fault and temperature signals, the valve is formed by connecting two ball valves in parallel and is divided into an upper ball valve and a lower ball valve, the upper ball valve is a fixed ball valve, and the lower ball valve is a floating ball valve. The two balls are connected between the upper ball valve and the lower ball valve through a rotating shaft to achieve synchronous operation of the two valves. The torque of the switch valve is reduced; the built-in heating module solves the problem of potential safety hazards of the airplane caused by freezing and blocking during drainage of the airplane.

The utility model relates to the technical field of valve production, and discloses a plate shearing device for valve production, which comprises a plate shearing device, a liftable lifting tool apron is arranged on the plate shearing device, a plate shearing knife is mounted on the lifting tool apron, and an air supply component, a cooling component and an air injection component are arranged on the plate shearing device. The air supply assembly comprises a sealing cylinder, a sliding plug, a connecting rod and an air pipe, the sealing cylinder is fixed to the plate shearing device, the sliding plug is connected to the inner face of the sealing cylinder in a sealed and sliding mode, and one end of the connecting rod is fixedly connected with the sliding plug. Low-temperature gas is sprayed out through the gas spraying holes, the temperature of the plate shearing knife can be effectively reduced, the problems that in the high-frequency blanking process, due to the fact that the temperature is too high, tool abrasion is aggravated, and size precision is reduced are solved, the temperature of the plate shearing knife is reduced, the abrasion speed of the tool can be reduced, the service life of the tool can be prolonged, and the tool replacement frequency is reduced; and the production cost is reduced.

The utility model discloses a variable-voltage battery pack which comprises a bottom cover, a shell is installed at the upper end of the bottom cover, a sampling circuit board is installed at the inner side of the shell, a voltage transformation assembly is arranged at the upper end of a control panel, a spring is arranged at the left end of the voltage transformation assembly, and the sampling circuit board is arranged at the right end of the control panel. According to the device, a ventilation plate is arranged at the upper end of the upper cover, the ventilation plate is clamped to the inner portion of a groove of the upper cover through a clamping plate, the heat dissipation effect in the shell can be improved through disassembly of the ventilation plate, and therefore the heat dissipation effect of the interior of the shell can be improved, and the heat dissipation effect of the interior of the shell can be improved. During disassembly, a rotating handle is rotated, so that a gear shaft drives a square column to move, and the ventilation plate can be disassembled by moving the square column out of an insertion hole in the upper cover, so that the internal heat dissipation effect is improved, the normal working temperature of the battery pack is favorably kept, the performance of the battery is improved, and the service life of the battery is prolonged.

The invention discloses a magnesium alloy tea picking robot steering control arm which comprises a control arm body, steering parts are fixedly installed at the two ends of the control arm body, a steering shaft is rotationally connected between the two steering parts, and a steering arm is fixedly installed on the outer side wall of the steering shaft. One end of the steering shaft penetrates through one steering piece and is fixedly provided with a follow-up block, a mounting groove is formed in the follow-up block, and a lubricating assembly is arranged on the outer side of the follow-up block. When the steering arm rotates by a certain angle, lubricating oil can be automatically sprayed to the rotating part of the steering arm, friction force and abrasion are reduced, heat and noise generated by friction are reduced, meanwhile, air can be blown to the rotating part of the steering arm, and therefore the heat dissipation efficiency is improved, the steering arm is helped to dissipate the generated heat in time, and the service life of the steering arm is prolonged. The working temperature is kept within a reasonable range, use is convenient, the spraying amount of lubricating oil can be adjusted at will, and the use requirements under different conditions are met.

The utility model relates to a self-heating magnetic fluid sealing device, which comprises a shell unit, an inner shaft, an outer shaft, a sealing unit, a sealing unit and a sealing unit, the shell unit is sleeved outside the inner shaft, and a storage space is formed between the shell unit and the inner shaft; the outer shaft is arranged on the outer side of the inner shaft in a sleeving mode and located in the storage space; the heating mechanism is arranged on the outer side of the outer shaft in a sleeving mode and located in the storage space; wherein the heating mechanism comprises a magnetic pole unit, the magnetic pole unit sleeves the outer side of the outer shaft, and a mounting groove is formed in the magnetic pole unit; the magnet unit is arranged on the outer side of the outer shaft in a sleeving mode, and the magnet unit is located at the end of the magnetic pole unit; the heat pipe is laid in the mounting groove; the heat pipe cover plate is arranged in the mounting groove, and the heat pipe cover plate is laid on the heat pipe; and the sealing cover is arranged in the mounting groove, and the sealing cover is laid on the heat pipe cover plate. By introducing the heating device, the working temperature of the inner magnetic pole and the magnetic liquid is ensured, so that the magnetic fluid structure can be used for transferring a refrigerant and can also bear a certain axial load.

The upper frame type case comprises a case body with the front end and the rear end open, a front panel is fixedly arranged at the front end of the case body, a rear panel is fixedly arranged at the rear end of the case body, a mixed backboard, a power source and a fan module are arranged in the case body, and handles are symmetrically arranged on the left side and the right side of the front panel; an air inlet is formed in the front panel, air outlets are formed in the left side and the right side of the case body, the hybrid backboard meets the PXIE backboard standard, a PXI bus and a CPCI bus are arranged on the hybrid backboard, and the hybrid backboard comprises a main control board card area and a service board card area. The upper frame type case can be conveniently lifted and placed on the rack of the server, the expansion performance of the case is improved, uniform ventilation and heat dissipation can be conducted on the mixed backboard and the board card, and the working temperature of the upper frame type case is guaranteed.

The utility model discloses a battery air -cooled system of solar energy beacon, including heat dissipation subassembly and protection subassembly, heat dissipation subassembly is located on the battery box and the door, and protection subassembly is located on the door and uses with heat dissipation subassembly cooperation, heat dissipation subassembly includes exhaust hood, air inlet and fan, and the exhaust hood is communicated with one side of battery box, and the air inlet is set up on the surface of the door, and the fan is installed in the communication of exhaust hood and battery box. Through the air circulation channel of fan drive, realize the quick conduction and discharge to the battery heat, compared with traditional venting hole heat dissipation mode, effectively promote the heat dissipation efficiency, ensure that the battery operating temperature maintains in the safety interval, and the relative setting of exhaust hood and hinge solves the interference problem of door opening and closing and exhaust path, and the rectangular array distribution of air inlet and air outlet, the maximum ventilation area in the limited space, is applicable to various specifications solar energy beacon battery box.

The utility model relates to the bus duct technical field, concretely relates to a heat dissipation type energy -conserving bus duct, including the top surface of bus duct installation passive heat dissipation component, bus duct side installs the reciprocating type covering mechanism, reciprocating type covering mechanism covers the heat dissipation hole on bus duct side's corresponding position department, bus duct end portion installs the supporting plate, and the supporting plate is perpendicular structure with bus duct, the driving mechanism of driving reciprocating type covering mechanism is installed on the supporting plate and makes reciprocating motion, PLC controller is installed to one side of supporting plate, and temperature sensor is installed on bus duct bottom surface, PLC controller is connected with temperature sensor, the motor of driving mechanism through wire, when reciprocating type covering mechanism leaves the heat dissipation hole, heat dissipation hole, bus duct inner chamber and passive heat dissipation component's L shape heat pipe form dynamic formula heat dissipation channel, can heat quickly, thereby guaranteeing the normal operating temperature of cable in bus duct.

The utility model provides a machine tool base structure with a good heat conduction effect, and relates to the technical field of machine tool base structures, the machine tool base structure comprises a base body, a support and a sliding rail, the upper surface of the base body is provided with a top groove, a placing frame is fixedly installed in the top groove, the upper surface of the placing frame is provided with a heat conduction plate, and the top groove is internally provided with a heat conduction groove; an inner groove is formed in the base body, and a water tank is arranged on one side of the base body. Through the arrangement of the top groove, the heat-conducting plate, the heat-conducting groove, the connecting pipe and the water tank, heat generated by the machine tool base can be conducted to the heat-conducting groove through the heat-conducting plate by utilizing the contact between the heat-conducting plate and the surface of the bottom of the machine tool, so that the heat is dissipated from the heat-conducting groove; and cold air emitted by condensate injected into the connecting pipe is used for cooling and dissipating heat conducted by the heat conducting plate, so that the heat dissipation effect of the machine tool base is improved, the normal working temperature of machine tool equipment is maintained, and the stability and performance of a machine tool are improved.

An electric cabinet with a mobile rotary communication screen relates to the technical field of electric cabinets, and comprises an electric cabinet and a communication screen, and the communication screen is arranged at the upper position of the front side of the electric cabinet; a cabinet door connected with the electric cabinet is arranged at the lower part of the communication screen; a lead screw elevator extending forwards is fixedly arranged on the inner wall of the rear side of the electric cabinet, and a supporting arm fixing base is arranged on a movable sliding block of the lead screw elevator. A multi-section rotary support arm of which one end is connected with the support arm fixing seat is arranged on the support arm fixing seat, and the other end of the multi-section rotary support arm is fixedly connected with the rear side of the communication screen; the multi-section rotary support arm comprises rotary joints and support arms connected between the rotary joints; an L-shaped clamping hook is arranged on the inner wall of the upper part of the electric cabinet; and a limiting groove clamped and matched with the L-shaped clamping hook is formed in the rear side of the communication screen. According to the utility model, the moving and rotating functions of the communication screen are realized, and the operation convenience, the operation flexibility and the safety of the electric cabinet in debugging, maintenance and daily use are obviously improved.

The utility model relates to mosquito repellent device technical field discloses a portable mosquito repellent device, wherein, including casing, power, control piece, heating piece and reflector, the first chamber and second chamber are formed in the casing, power and control piece all are located in the first chamber, power is connected with control piece electricity, heating piece is located in the second chamber, heating piece is connected with control piece electricity, and, heating piece divides the second chamber into first cavity and second cavity, first cavity is used to accommodate mosquito repellent piece, reflector is located in the second cavity and the reflection surface of reflector faces heating piece and sets up, reflector is used for reflecting the heat of heating piece. Through reflector, the heat that heating piece dissipates is reflected back to heating piece, reduces heat dissipation, makes the heat concentration of heating piece to mosquito repellent piece transmission, improves heating efficiency, reduces the power consumption, is favorable to satisfying long time's use demand.