283 results about "Environmental tests" patented technology

The invention discloses salt spray environment test equipment for environment test, and belongs to the technical field of environment test. The device comprises a test box, a spraying assembly is installed in the test box, a plurality of fans are fixedly installed in the test box, a plurality of heaters are fixedly connected in the test box, a test rack is placed in the test box, a clamping assembly is installed on the test rack, and a simulation assembly is further installed on the test rack. The simulation assembly comprises a shielding assembly, an impact assembly and a friction assembly, the shielding assembly comprises a supporting frame, and a hydraulic cylinder is fixedly installed on the supporting frame. In the circulating corrosion test process, the hydraulic cylinder can be started, atomized saline water is prevented from falling on a sample, and the shielding time can be manually set, so that a control test is formed, that is, one part of the sample is shielded, the other part of the sample is not shielded, and different shielding time can be set on different samples, so that the accuracy of the control test is improved. And test results are enriched.

The invention relates to the technical field of programmable multi-mode integrated control, in particular to an integrated control platform of a programmable multi-mode environmental test chamber, which comprises a multi-mode sensing unit, a dynamic logic reconstruction unit, a virtual verification sandbox unit and a feedback optimization unit, the multi-modal sensing unit synchronously collects parameters such as temperature and humidity to generate environment data streams, the dynamic logic reconstruction unit analyzes parameter interaction by using a long-short-term memory neural network in combination with a double-attention mechanism to generate an optimal control logic chain, the virtual verification sandbox unit constructs digital twin pre-execution control logic, and the virtual verification sandbox unit constructs digital twin pre-execution control logic. The physical actuator is activated after the error rate is ensured to be lower than a preset threshold value, the feedback optimization unit dynamically adjusts the function block selection weight according to the actual response time delay and the energy consumption deviation, and a high-precision and low-energy-consumption intelligent control scheme is provided for the reliability test of high-end products in the fields of aerospace, electronic components and the like.

The invention relates to an environmental test box for realizing high and low temperature rapid alternating circulation, which is mainly applied to the technical field of environmental test equipment. The test box is provided with a high-temperature chamber and a low-temperature chamber which are independent from each other, a thermal insulation layer is arranged between the two chambers, and the test box can respectively keep constant temperature environments at the highest temperature of + 75 DEG C and the lowest temperature of-50 DEG C; during a test, a sample is placed in the test bed, and the rotating shaft structure driven by the motor periodically rotates in a reciprocating manner or rotates in the same direction among different temperature zones, so that high-low temperature rapid alternating circulation is realized. The operation mode of the motor is controlled through the control system so as to simulate the accelerated aging process of the component in the temperature rapid alternating environment. According to the test box, through the design of the control system, the forced convection fan and the middle thermal insulation layer, it is guaranteed that the temperature switching process is rapid, uniform and stable. Compared with the prior art, high and low temperature circulation can be completed without overall heating and cooling of the interior of the test box, and the test box has the advantages of being high in test efficiency, capable of remarkably improving the reliability and accuracy of the high and low temperature alternating circulation test of the sample and the like.

The invention relates to a self-adaptive control method, system and device for environment test equipment, and the method comprises the following steps: S1, data collection: collecting environment detection data and data of a corresponding actuator according to a to-be-controlled physical quantity; s2, selecting or constructing a control object according to the physical quantity to be controlled; s3, performing online identification operation when an identification condition is met, otherwise, directly executing the step S4; s4, feedforward and feedback: calculating feedforward compensation and feedback compensation according to the value of the to-be-estimated quantity, and superposing the feedforward compensation and the feedback compensation to obtain a control instruction; and S5, performing constraint allocation on the actuator: performing saturation constraint processing on the control instruction to obtain a control quantity of the corresponding actuator. Joint online identification can be carried out on the to-be-estimated quantity only through perturbation excitation; different loads and test object states are automatically adapted; saturation constraint processing is adopted; the model and the algorithm are low in calculation amount, and precision, speed and engineering realizability are considered.

According to the high-voltage wiring harness testing system and the control method thereof, the high-voltage wiring harness testing system integrates the mechanical strength testing unit, the environment testing unit and the electrical performance testing unit, vibration, high-low temperature and strong current can be applied at the same time, electric, thermal and mechanical vibration multi-physical field coupling is achieved, and the testing efficiency is improved. The test units are synchronously controlled by the central control system, so that the actual influence of a multi-scene superposition factor on the wire harness can be simulated; a sensor network in the system collects vibration test data, temperature test data, current test data and insulation performance data in real time and transmits the data to a central control system, and the central control system analyzes the performance of a to-be-tested high-voltage wire harness under the current test working condition by using the test data and then generates a test report. Therefore, the accuracy of the test result and the test efficiency are effectively improved.

The invention relates to the technical field of electrical detection, in particular to a multi-stress coupling environment reliability testing method for an electricity consumption information acquisition terminal. Comprising the steps of applying a combined stress field to an electricity utilization information acquisition terminal through an environment test box; acquiring power utilization information acquisition terminal parameters; the method comprises the following steps of: capturing metering pulse response and carrier communication interaction signals of an electricity utilization information acquisition terminal under the excitation of a combined stress field by utilizing an electrical sensor, extracting carrier signal-to-noise ratio data and metering reference drift data, and generating a reference voltage compensation coefficient and an impedance matching threshold value; projecting the carrier signal-to-noise ratio data to an impedance matching threshold value, and constructing a stress failure envelope surface according to a hardware overload protection threshold value; and mapping the communication quality distortion residual vector to a stress failure envelope surface, and calculating a reliability life prediction value. According to the method, a uniform excitation environment is constructed, and performance degradation of different dimensions is uniformly quantified into accumulative stress damage integral, so that the comprehensive anti-interference capability of the terminal in a multi-stress coupling environment can be truly reflected.

The embodiment of the invention discloses a linear cooling control method for an environmental test chamber, which comprises the following steps of: determining the rotating speed of a variable-frequency compressor of each equally divided cooling section according to a cooling theoretical parameter of each equally divided cooling section, a second cooling parameter of the environmental test chamber, a linear cooling rate and an operating parameter of the variable-frequency compressor; according to the cooling theoretical parameter of each equally divided cooling section, the third cooling parameter of the environmental test box, the linear cooling rate and the electronic expansion valve operation parameter, determining the electronic expansion valve step opening of each equally divided cooling section; according to the first operation data of the inverter compressor and the evaporator in each equally divided cooling section, the final temperature of the environmental test box, the operation parameters of the evaporator fan and the linear cooling rate, the rotation speed of the evaporator fan in each equally divided cooling section is determined; and according to the second operation data of the inverter compressor and the condenser in each equally divided cooling section, the operation parameters of the condenser fan and the linear cooling rate, the rotating speed of the condenser fan in each equally divided cooling section is determined.

The invention relates to the technical field of electromagnetic shielding cabinet testing, in particular to a dynamic performance testing device and method for an electromagnetic shielding cabinet, and the device comprises an environment testing cabin which is used for placing a to-be-tested cabinet and providing a controlled electromagnetic background environment; the dynamic load simulation system is mechanically connected with the to-be-tested cabinet and is used for applying physical excitation with preset strength to the to-be-tested cabinet so as to simulate structural deformation of the to-be-tested cabinet in a working state; and the signal transmitting system comprises a transmitting antenna arranged outside the to-be-tested cabinet and is used for generating an electromagnetic signal covering a preset frequency band. The dynamic load simulation system simulates vibration, cabinet door opening and closing and other actual dynamic working conditions, the temperature and humidity adjusting module is combined to simulate different climatic environments, meanwhile, the high-speed synchronous triggering module is used for achieving high-precision synchronization of dynamic load applying, electromagnetic signal transmitting and data collecting, multi-working-condition collaborative simulation and precise synchronous testing are achieved, and the testing efficiency is improved. And the authenticity and the reference value of a test result are greatly improved.

The present application provides a humidifying device and an environmental test device. The humidifying device includes a first humidifying heater for heating water in a humidifying container, a second humidifying heater having an output capacity larger than that of the first humidifying heater, and a humidifying control unit. The humidifying control unit causes the first humidifying heater to continuously operate when a required output is in a range belonging to a first region and in a range belonging to a second region having a higher required output than the first region, and controls the first humidifying heater according to the size of the required output when the required output is in the range belonging to the first region by stopping the second humidifying heater, and controls the second humidifying heater according to the size of the required output when the required output is in the range belonging to the second region in a state where the first humidifying heater is operated. Accordingly, confusion in humidity control between the regions having different sizes of the required output of the heater can be suppressed.

The invention relates to the technical field of test equipment design and manufacturing, in particular to an underwater vehicle head section product environment test clamp. The underwater vehicle head section product environment test clamp comprises a base and a mounting frame, the base comprises a bottom plate, side plates and reinforcing ribs, the bottom plate is fixedly connected with the side plates, and the reinforcing ribs are fixedly connected between the bottom plate and the side plates; the bottom plate is provided with a mounting hole used for being connected with a vibration test bed, an impact test bed or a constant acceleration test bed; the mounting frame comprises a base plate, a connecting plate and a rubber gasket, the base plate is provided with a mounting structure for mounting a product, the rubber gasket is arranged on the mounting surface of the base plate, and the connecting plate is fixedly connected with the base plate; wherein the mounting frame is detachably and fixedly connected with the side plates of the base through the connecting plates.

The application discloses a high-altitude environment laboratory safety protection system, which comprises a control room, a transition room and a high-altitude environment laboratory. The control room is communicated with the transition room through a first transition door and a third pipeline, and the transition room is communicated with the atmosphere environment through a first pipeline. The transition room is communicated with the high-altitude environment laboratory through a second transition door, a second pipeline and a fourth pipeline. A first control component and a second control component are respectively formed on the first pipeline and the second pipeline in the transition room. A three-way adjusting piece is used for connecting the first pipeline, the second pipeline and the transition room. A third control component is formed on the first pipeline in the control room. A fourth control component is formed on the fourth pipeline in the high-altitude environment laboratory. A first differential pressure sensor is formed in the control room or the transition room. A second differential pressure sensor is formed in the transition room or the high-altitude environment laboratory. The first transition door and the second transition door are in a mutually exclusive relationship. The application can avoid the health risks of the operating personnel when entering and leaving the high-altitude environment laboratory, and ensure the health and safety of the operating personnel.

The utility model discloses an environmental test chamber separating device with temperature zoning, and belongs to the technical field of large-scale environmental test chambers. According to the environment test chamber separating device for temperature zoning, a test chamber comprises a first chamber body and a second chamber body, a separating wall is arranged between the first chamber body and the second chamber body, an underground space is arranged on the inner side of the first chamber body, a dynamometer is arranged on the underground space, a mounting base is arranged on the separating wall, and a temperature sensor is arranged on the mounting base. A first sliding door and a second sliding door are arranged on the inner side of the mounting seat; the first air bag strips are arranged on the sides, close to the partition wall, of the first sliding door and the second sliding door, inflation is conducted through the air pump in the underground space, the sealing performance of the partition device is effectively enhanced, the second air bag strip and the connecting piece are arranged at the end, close to the second sliding door, of the first sliding door, and it is further ensured that when the two doors are closed, the partition wall is closed. Due to the sealing effect between the two parts, heat exchange between different temperature areas is avoided, and the accuracy of an experimental result is improved.

An environmental test enclosure conditions the inlet air of a device under test (DUT) using a recirculating airflow loop that faces the DUT's intake side. Panels with insulating material form the loop, which includes an environment-conditioning device positioned upstream of the intake to add or remove heat and / or moisture. An ambient-air mixing aperture on the enclosure communicates the loop with room air to trim the inlet condition without dedicated chilling or additional heating. One or more sensors measure an inlet environmental parameter (e.g., temperature or relative humidity), and a controller maintains airflow toward the intake and coordinates the conditioning device output with the aperture setting. Exhaust air from the DUT is routed back toward the conditioning device to reuse waste heat, improving energy efficiency and test throughput.

The invention relates to the technical field of environment test, and discloses a comprehensive environment simulation test device and method, the device comprises a vacuum tank, a vacuum unit, a first temperature adjusting mechanism, a second temperature adjusting mechanism and a control system, and an opening at one end of the vacuum tank is provided with a sealing door capable of being opened and closed; the vacuum unit is used for adjusting the vacuum degree in the vacuum tank; the first temperature adjusting mechanism is used for adjusting the internal temperature of the vacuum tank; the second temperature adjusting mechanism is used for lowering the internal temperature of the vacuum tank; a micro-low gravity environment simulation module is arranged in the vacuum tank, and the micro-low gravity environment simulation module is used for driving the test sample to rotate in the first direction while rotating in the axial direction, so that the test sample can be simulated to be tested in a comprehensive environment with high / low temperature alternation, different vacuum degrees and different micro-low gravity factors in a single device; and the cost is saved and the occupied space is small.

The utility model relates to the technical field of environmental test equipment, in particular to an adjustable locking mechanism of environmental test equipment, which comprises a test box, a spring and a locking component. A box door is arranged on one side of the test box, a fixing block is arranged on one side of the box door, a connecting block is arranged on one side of the test box, a locking assembly is arranged on one side of the box door, a spring is arranged on the inner side of the fixing block, a limiting block is arranged on one side of the spring, a first rotating shaft is arranged on the inner side of the limiting block, and a threaded ejector rod is arranged on the inner side of the fixing block. A groove is formed in the position, corresponding to the limiting block, of the fixing block, the limiting block is movably connected into the groove of the fixing block, and a groove is formed in the position, corresponding to the first rotating shaft, of the fixing block. According to the device, through an anti-reversion mode, after the device is locked, the device is fixed and prevented from reversion, and therefore the problems that locking is conducted in a most threaded connection mode, threaded connection is vibrated and impacted in the working state of the device, and connection looseness or failure or premature fatigue damage can be possibly caused are solved.

This invention provides a detachable wind deflector structure and usage method for an aging test chamber, belonging to the technical field of environmental testing equipment. It includes a wind deflector, an active condensate collection module, a wind force verification module, a first base plate, and a first rotating rod. The active condensate collection module is located on one side of the wind deflector, and the wind force verification module is located on one side of the active condensate collection module. The first base plate is fixedly connected to the other side of the wind deflector, and the first rotating rod is fixedly connected to the front of the first base plate. This invention, through the active condensate collection module, can actively collect condensate, so that the wind blowing towards the test sample will not carry away condensate when passing through the wind deflector. This reduces the probability of condensate being blown onto the test sample, thereby reducing the possibility of damage caused by condensate.

The invention relates to a multi-parameter tester calibration system and method in a complex environment, and the system comprises a composite environment simulation device which is used for simulating extreme temperature, humidity, air pressure and vibration environment; a tester electrical parameter calibration device which is integrated with or arranged in parallel with the composite environment simulation device and is used for calibrating the tester in the simulation environment; a multi-parameter calibration device which is integrated with or arranged in parallel with the composite environment simulation device and is used for calibrating the plurality of sensors in the simulation environment; wherein the composite environment simulation device, the tester electrical parameter calibration device and the multi-parameter calibration device work cooperatively so as to construct a multi-parameter calibration database in a complex environment; and the measurement result of the tester is corrected in real time by using the multi-parameter calibration database. According to the invention, the problems that a multi-parameter tester is poor in environmental adaptability and lacks in calibration capability and self-adaptive correction capability in a complex environment are solved.

The utility model belongs to the technical field of environmental tests, and particularly provides a device for controlling the temperature of an environmental test medium, which comprises an environmental temperature box. A medium box, a first temperature sensor, a liquid level meter, a filter, a test sample, a pressure sensor, a second temperature sensor, a regulating valve, a flow meter, a heat exchanger, an overflow valve and a heat exchange fan are arranged inside the environment temperature box, and a circulating pump is arranged outside the environment temperature box; the medium box provides a liquid medium for a test sample; the pressure sensor detects the pressure of the liquid medium at the test sample outlet; the regulating valve regulates the pressure of the liquid medium at the test sample outlet; the flow meter detects the flow of the liquid medium at the test sample outlet; the circulating pump conveys a liquid medium in the medium box into the heat exchanger and exchanges heat with the environment temperature box through the heat exchange fan; and the overflow valve guides the redundant liquid medium at the outlet of the circulating pump back into the medium box. The device has the advantages of being controllable in medium temperature, low in cost and low in energy consumption.

The present application belongs to the field of environmental test technology, and discloses a grid disc supporting assembly and an environmental test box. The grid disc supporting assembly comprises a support and a slide rail. Two supports are arranged on two opposite inner walls of the environmental test box. A plurality of variable-diameter mounting holes are arranged on the support in the vertical direction. The variable-diameter mounting hole comprises a first hole and a second hole which are communicated. At least two slide rails are connected to the two supports respectively. A variable-diameter mounting head is arranged on the slide rail. The variable-diameter mounting head comprises a mounting cap and a mounting neck. The variable-diameter mounting head is selectively mounted with the variable-diameter mounting hole to adjust the mounting height of the slide rail. The mounting and dismounting are convenient and fast. The two ends of the grid disc are supported on the top end faces of the two slide rails. In the present application, the grid disc is supported by surface contact with the slide rail, which facilitates the improvement of the support stability of the grid disc. The grid disc does not need to be processed with a clamping groove or a clamping convex, which ensures the strength of the grid disc and avoids deformation. The height position of the grid disc is realized by switching the slide rail on the support, which greatly improves the test safety and efficiency.

The utility model discloses an environment test chamber structure which comprises a test chamber body, a guide rail, a flat car and a position adjusting structure. The guide rail extends into the test cabin body from the ground in front of the test cabin body, the flat car is arranged on the guide rail and can slide along the guide rail, and a test product is placed on the flat car; the test cabin is of a square structure, the position adjusting structure comprises four winches and height adjusting equipment, the four winches are arranged at the four corners of the inner side of the bottom of the test cabin respectively, one end of a rope wound by each winch is connected with a test product, and the other end of the rope is connected with the height adjusting equipment. And the height adjusting equipment is arranged on the outer side of the top of the test cabin body and is connected with the top of the test product. According to the utility model, overweight (oversized) test products can be conveniently transported into the environment test cabin, and the positions and angles of the test products on the flat car can be adjusted.

The utility model discloses a multifunctional power measuring environment test chamber, which comprises a first test chamber, a second test chamber, a partition door, a vehicle access gate, an underground space, a power measuring platform, a dynamometer assembly, an illumination assembly and a large fan, a pump room is further arranged outside the first test cabin and the second test cabin, industrial refrigeration equipment and industrial heating equipment are arranged in the pump room, and pipeline systems connected with the industrial refrigeration equipment and the industrial heating equipment are arranged on the first test cabin and the second test cabin respectively. Through the arrangement of the high and low temperature system, the illumination, the fan and the dynamometer assembly, the multifunctional dynamometer environment test chamber not only has the test capabilities of high temperature, low temperature, damp heat and temperature shock, but also has the dynamometer test function under the environments of wind test simulation, solar thermal effect and the like.

The present invention relates to the technical field of turbine flow testing, specifically a turbine flow testing structure based on environmental simulation and regulation, comprising a turbine body, a circulation mechanism, and a testing mechanism, wherein the testing mechanism is arranged at the output and input ends of the turbine body, and the circulation mechanism is arranged at the rear side of the testing mechanism, and the circulation mechanism comprises an adjusting component, a positioning component, a storage component, a buffer component, a separation component, a supply component, and a simulation component, wherein the positioning component is arranged at the top of the adjusting component, the storage component is arranged at the inner side of the positioning component, and the buffer component is arranged at the inner side of the storage component. The present invention provides a turbine flow testing structure based on environmental simulation and regulation, which has a synchronous simulation and regulation structure for different water pressures and impurities in water, so that flow tests can be performed on the turbine with synchronous simulations of different water pressures and impurities in water, thereby improving the flexibility of testing the turbine flow in different environments.

The present application relates to the technical field of plate performance testing, and particularly relates to a kind of plate edge durability test method;It comprises the following steps: cutting plate sample into standard size test piece;Using thermal mechanical analyzer respectively test the linear expansion coefficient of test piece edge material and base material;The test piece after processing is placed in environmental test chamber and is subjected to cyclic test;Test piece is fixed on load testing device, and constant load is applied along the direction perpendicular to the edge interface of plate plane;Using flatness tester to measure the overall warping of test piece, compare with the warping data before testing, calculate the warping change, evaluate the actual effect of plate balanced laminating process on preventing warping after edge sealing;Using weighted scoring method to calculate the comprehensive score of edge durability;Realize that the long-term durability of plate edge sealing under complex working conditions can be comprehensively and accurately evaluated, and provide scientific and comprehensive technical support for edge sealing process optimization, material selection and structure design.

The utility model relates to the technical field of rain test boxes, and discloses a strong-wind-resistant rain test box which comprises a box body, one side of the box body is communicated with an air inlet, one end of the air inlet is rotatably connected with two symmetrical first rotating shafts in an inserted mode, and the tops of the first rotating shafts are fixedly connected with second bevel gears. By arranging the regulation and control plate, the flow guide opening, the air guide plate and other structures, the air quantity entering the box body can be effectively regulated, meanwhile, under the external strong wind condition, the wind force is dispersed and guided through the flow guide opening and the air guide plate, the impact of wind pressure directly acting on the box body is remarkably reduced, and therefore the overall wind resistance and structural stability of equipment are improved. And the servo motor is adopted to drive the regulation and control plate to realize adjustable air port control, so that the air supply precision is improved, and environment tests under various different wind and rain conditions can be simulated conveniently.

The utility model discloses a sealed environment test box, include: test box body, the beneficial effect of the utility model is: through having set up heat preservation ventilation tank, electric heating wire and three -way pipe, has realized the wind that enters heat preservation ventilation tank through electric heating wire and heats, and the wind of heating enters ventilation tank through three -way pipe, through a plurality of air inlet net frame and enter test box body, heat treatment is carried out to the elastic clamp of the connection between oil inlet pipe and connecting oil outlet pipe, and the cold -air supply structure can be blown into the cold -air to test box body, and the cold -resistant sealing effect of elastic clamp is handled, through having set up bidirectional screw rod, sliding block and fixed slide, has realized the output end of motor and drives bidirectional screw rod rotation, and the sliding block of outside symmetry is driven to move when bidirectional screw rod rotates, and fixed slide is driven to move through the sliding block, and fixed slide drives sealed observation door to slide at the one side of test box body, and the opening and closing adjustment of sealed observation door is handled conveniently.

The present application relates to the technical field of test equipment, in particular to a three-comprehensive vibration environment test box, which comprises a box body and a connecting frame, one side of the box body is provided with a test station area for placing test pieces to carry out multi-environment simulation test, a connecting frame is arranged in the test station area, a multi-directional movable connecting plate is arranged in the middle of the connecting frame, and an inflatable part is tightly connected between the connecting frame and the connecting plate. By arranging the annular inflatable part on both sides of the connecting frame for providing vibration effect, when the connecting frame moves horizontally or vertically, the inflatable part will expand and abut against one side of the connecting frame, thereby increasing the friction between the inflatable part and the connecting frame, reducing the shock feeling and providing certain noise reduction effect.

The utility model relates to the technical field of environmental test equipment, and particularly discloses a window sealing device of a high-low temperature damp-heat low-pressure test box, which comprises a window frame, and a multi-sealing component, an elastic component and a buffer layer are arranged on the inner wall of the window frame; the multi-sealing assembly is composed of an outer-layer sealing ring, an inner-layer sealing ring and a middle supporting ring, the elastic assembly comprises a plurality of annular spring sets which are arranged on the outer wall of the extension plate and are annularly distributed, and the outer-layer sealing ring resists high temperature, chemical corrosion and friction loss and bears external environment pressure; low-temperature elastic compensation and deformation self-adaption capacity are provided through the inner-layer sealing ring, stress is dispersed in the middle of the supporting ring, the situation that single-layer sealing loses efficacy due to local overload is avoided, and therefore multi-layer sealing protection is achieved. The pre-tightening force of the annular spring set is transmitted to the supporting ring through the inner-layer sealing ring, overall supporting of the sealing structure is formed, and the annular array design of the annular spring set ensures that the pressure of the sealing face is evenly distributed.

The present invention provides an environmental testing device, comprising: a heat-insulating chamber which includes a test chamber and is formed by an electrically conductive heat-insulating plate; an air conditioner; the heat insulation chamber comprises a chamber main body with an entrance and an exit and a door body for opening and closing the entrance and the exit, the heat insulation plate forming the chamber main body comprises an outer plate and an inner plate arranged on the inner side of the outer plate, and the air supply fan is used for generating air flow enabling the air conditioned by the air conditioner to flow into the test chamber. A heat insulation plate forming a chamber main body and a heat insulation plate forming a door body are connected in a mutually electrically conductive manner, and the heat insulation plate forming the chamber main body is provided with an opening through which at least one of a shaft of an air blower and a part of a component forming an air conditioner is inserted. And a shield box which is attached to the insulation plate having the opening so as to cover the opening from the outside of the insulation chamber, is electrically conductive to the insulation plate, is formed of an electrically conductive member, and defines a space by the shield box and the insulation plate having the opening.