37results about How to "Realize adjustable" patented technology

The invention discloses a preparation device, a beverage preparation machine and a preparation operation method thereof, the preparation device comprises a base and a steam module, the steam module comprises a steam rod, the steam rod is provided with a first end and a second end, and the first end is rotatably installed on the base so as to drive the second end to form an included angle relative to the base in the process of external force driving rotation; one of the steam rod and the base is provided with an interference protrusion, the other one of the steam rod and the base is correspondingly provided with an interference face, in the rotating process of the steam rod, the interference protrusion is driven to move on the interference face, interference force used for preventing the steam rod from rotating is generated between the interference protrusion and the interference face, and the interference force is variably arranged. When the steam rod rotates, variable interference force is generated between the interference bulge and the interference surface, so that the interference bulge currently moves to a certain area of the interference surface can be determined by sensing the interference force in an associated manner, the rotation process of the steam rod relative to the machine body is controllable and can be stopped at any time, and the steam rod is more flexible.

The utility model discloses a lighting electric appliance convenient to use, and relates to the technical field of lighting electric appliances, the lighting electric appliance comprises a lighting lamp, the lower end of the lighting lamp is provided with an adjusting mechanism, the adjusting mechanism comprises two connecting rings, and the connecting rings are connected to the lower end of the lighting lamp; a pipe head is connected between the two fixing rings; the connecting tightening latch is in threaded connection with the interior of the fixing ring, and the connecting tightening latch is rotationally connected with the interior of the connecting ring; and the transverse extrusion plate is connected to the outer end of the connecting tightening latch. The angle-adjustable illuminating lamp is reasonable in design structure, the angle of the illuminating lamp can be adjusted at will, the angle position of the illuminating lamp can be fixed by further rotating the connecting tightening latch and the rotating ring, it is ensured that the angle of the illuminating lamp is fixed in the using process, and compared with a traditional illuminating electric appliance, part of illuminating lamps can be adjusted at will, and the using cost is reduced. However, in the use process, angle deviation is easily generated due to external force, so that the use experience of a user is reduced.

The application discloses a driving mechanism, a stand column, a transmission device and a flexible tracking support, and belongs to the technical field of photovoltaic power generation. The driving mechanism is used for driving a photovoltaic module installed above a cross beam to track the rotation of the sun, and comprises: a fixed end of a telescopic rod is fixed with the cross beam, and the other telescopic end is connected with a sliding pin; a rotation point of a slide rail relative to the cross beam is fixed; the sliding pin is slidably installed on the slide rail; a rotating shaft of a rotating disc is fixed relative to the rotation point of the cross beam; a far end of a first connecting rod is hinged with the sliding pin, and a near end of the first connecting rod is hinged on an eccentric position of the rotating disc; and a driving piece is used for driving the rotating disc to rotate. The application realizes the cooperative locking of the flexible tracking support with multiple structures, cooperates with three self-locking points, forms multiple protections, greatly improves the anti-deformation capability of the support under extreme wind load, and reduces the safety hidden danger.

The utility model relates to the technical field of wasp breeding equipment, concretely relates to three -dimensional wasp breeding frame of adjustable interval, including left and right two groups of mutually symmetrical vertical beams, mutually symmetrical between two vertical beams in each group, the inside surface of two vertical beams in each group is fixedly installed with a plurality of slide rails, and the top and bottom of four vertical beams are fixedly installed with reinforcing beams, and the detachable installation of support plate is arranged between the two slide rails that left and right face each other, and the end plate body of support plate is located in the slide rail and is connected with the slide rail between sliding, a plurality of nest frames are fixedly installed on the upper surface of support plate, the nest frame part is provided with a protective screen cover, the end part rod body of slide rail is provided with a clamping hole, the outer sleeve pipe is fixedly installed on the front side plate body of support plate, the plug -in limiting rod is slidably connected in the outer sleeve pipe, and the plug -in limiting rod and the clamping hole are inserted and matched. The utility model can adjust interval, has the function of limiting, and is convenient to use.

A piezoelectric superstructure capable of regulating and controlling axial bending wave transmission of a shell structure comprises a cylindrical thin-wall shell substrate, piezoelectric fiber composite material patches which serve as piezoelectric transducers and are arranged on the inner side and the outer side of the substrate respectively, a shunt circuit connected with the two piezoelectric fiber composite material patches and a one-way coupling element. The bending wave passband is opened by changing the parameters of the external circuit network, the bending wave is allowed to be axially transmitted along the shell structure when the frequency is lower than the loop frequency, and the transmission amplitude can be regulated and controlled. And when the frequency is lower than the loop frequency, a local resonance passband is opened, and meanwhile, the transmission amplitude can be flexibly regulated and controlled, so that a new way is provided for structural health monitoring in the shell structure.

The utility model discloses a large-load sucker hook, which relates to the technical field of sucker hooks and comprises a bottom plate, a sucker component is arranged on one side of the bottom plate and consists of a main sucker body and a plurality of small sucker cavities, and the small sucker cavities are arranged inside the main sucker body. A negative pressure component is arranged on one side of the sucker component on the bottom plate; a sliding rail is arranged on the side, away from the suction cup assembly, of the bottom plate, a supporting plate is slidably arranged on the sliding rail of the bottom plate, a hook body is arranged on the supporting plate, and a sliding assembly is arranged between the supporting plate and the bottom plate. The device is compact in structure, high in adsorption capacity, high in adaptability, adjustable in hook, capable of automatically returning, stable in load bearing and suitable for various scenes.

The utility model discloses a full-automatic electrolyte filling machine which comprises a controller, a weighing and conveying part and a machine frame fixedly installed on the side edge of the weighing and conveying part, a pipe clamping part and a three-dimensional camera part are installed on the top of the machine frame, a special clamping pipe communicated with a filling pump is clamped on the pipe clamping part, and the three-dimensional camera part is installed on the three-dimensional camera part. A robot clamping part fixedly installed on the rack is arranged below the weighing conveying part, the robot clamping part, the weighing conveying part and the three-dimensional camera part are all electrically connected with the controller, and the robot clamping part is suitable for moving a special clamping pipe on the pipe clamping part under the guidance of the three-dimensional camera part and communicating the special clamping pipe with a filling opening of the ton barrel. The semi-automatic filling machine is applied to ton barrel filling and the like in the electrolyte industry, compared with traditional semi-automatic equipment, the functions of various semi-automatic equipment can be integrated, the filling yield and safety can be improved, the overall dimension of the whole machine is compact and small, and the occupied space is saved.

The present invention discloses a method for visualizing the topological structure of high-dimensional data based on manifold approximation and graph simplification. The method performs manifold approximation on high-dimensional data to generate a weighted undirected graph, and then simplifies the graph to obtain a thumbnail of the weighted graph. The process can keep the high-dimensional data, the weighted graph and the thumbnail having the same topological structure, and the interpretability is strong. The grid where the image space is located is meshed based on the resolution parameter. Since the intersection between the grid elements is empty, multiple mapping features located in the grid elements do not intersect, so that the topological structure of the thumbnail obtained by aggregating the mapping feature subsets is the same as the topological structure of the high-dimensional data, and thumbnails of different resolutions can be obtained by adjusting the resolution parameter, so that any resolution parameter can be adjusted.

The utility model discloses a uniform material's flotation machine feed ear box, including ore pulp delivery pipe, mixed buffer tank, mixed discharge pipe and feed ear box, a plurality of ore pulp delivery pipes are connected with the top of mixed buffer tank, and the front end center position is connected with mixed discharge pipe, and the export of mixed discharge pipe is connected feed ear box, the both sides of feed ear box bottom are installed with flotation machine feed pipe, and the inboard of feed ear box bottom feed pipe is installed with two distribution baffle and distribution gate, and the height of different distribution gate is adjusted, and the ore pulp quantity of different feed pipe of feed ear box bottom is controlled. Solve the double row flotation machine ore pulp feeding of prior art and cannot evenly distribute, cause the problem of low running efficiency of flotation machine, and the fluctuation of flotation froth layer thickness is big.

The application relates to the technical field of new materials, and discloses a quasi-zero stiffness unit suitable for different tensile loads, a metamaterial vibration isolation structure and a design method, which comprise a first rigid side wall and a second rigid side wall, a positive stiffness unit is arranged in the center of the first rigid side wall, a negative stiffness unit is arranged at the opening of the top of the first rigid side wall, and one end of the second rigid side wall is connected with the vertex of the positive stiffness unit and extends upwards through the negative stiffness unit. The application realizes the regulation and control of the stiffness response of the structure under the action of different loads by parameterizing the design and multi-level combination of the tensile unit configuration and combining the interaction of the positive stiffness and the negative stiffness, the quasi-zero stiffness platform of the structure can be adjusted with the change of the tensile load, so that the stable low dynamic stiffness characteristics of the structure can be maintained within a wide load range, and then the adaptive regulation and control and flexible control of the low-frequency vibration isolation performance are realized.

This application provides an optical system and a laser cutting device. The system includes a first focusing lens, a concave lens, and a focusing lens group arranged coaxially along a first direction. The first direction is the initial transmission direction of the light emitted by the target light source. The optical axis of the first focusing lens passes through the virtual focal point of the target light source. The virtual focal point is the point where the reverse rays of the light emitted by the target light source converge. The distance between the first focusing lens and the virtual focal point of the target light source is greater than the focal length of the first focusing lens. The concave lens is configured to change the distance between itself and the first focusing lens to adjust the aberration of the light emitted by the target light source. As the distance between the first focusing lens and the concave lens in the collimating lens group changes from far to near, the optical system exhibits the following trends: negative defocus beam convergence and tending towards a flat top, positive defocus dispersion and tending towards Gaussianization, then the distribution of positive and negative defocus beams becomes equal, and finally, negative defocus dispersion and tending towards Gaussianization, and positive defocus beam convergence and tending towards a flat top.

This utility model discloses a flotation cell, belonging to the field of flotation cell technology. It includes a cell body and an aeration structure. The cell body has through-slots and locking slots on its left and right sides, respectively. Bottom baffles and top baffles are respectively provided at the bottom and top of the through-slots. The aeration structure includes a connecting pipe, a movable cover, an aeration pipe, and an aeration pump. The connecting pipe is located at the bottom of the cell body, the movable cover is located at the bottom of the outer surface of the connecting pipe, the aeration pipe is located at the bottom of the movable cover, and the aeration pump is located at the end of the aeration pipe furthest from the movable cover. This flotation cell changes the size of the bubbles by altering the length of the aeration pipe extending into the movable cover, thus changing the airflow at the bottom. The combination of porous media, the aeration pipe, the movable cover, and the aeration pump simulates the effect of a flotation column foamer, achieving micro-bubbles during bottom aeration, optimizing the flotation effect, and improving the flotation recovery rate of both oxide and sulfide ores. Bottom aeration allows large mineral particles to contact the bubbles, improving their floatability.

The utility model discloses a hydraulic oil cylinder convenient to assemble, particularly relates to the technical field of engineering machinery, and comprises an oil cylinder body, a rodless cavity and a rod cavity are arranged in the oil cylinder body, a balance valve body connected with the rodless cavity and the rod cavity is arranged on the outer side of the oil cylinder body, and a pair of exhaust pipes is fixedly connected to the outer surface of the oil cylinder body. The pair of exhaust pipes are communicated with the rodless cavity and the rod cavity respectively, each exhaust pipe is provided with an installation assembly, each installation assembly is provided with a pressure measuring connector, the outer side of each pressure measuring connector is provided with an exhaust assembly, and the exhaust assemblies are connected with the pressure measuring connectors; the outer surface of the oil cylinder body is fixedly connected with a pair of oil pipes, the pair of oil pipes are respectively communicated with the rodless cavity and the rod cavity, and the pair of oil pipes are respectively connected with an oil inlet and an oil outlet of the balance valve body; the technical problems that when the telescopic length of the piston rod is adjusted due to assembly of the hydraulic oil cylinder, the assembly workload is large, and the control precision of the balance valve is affected are solved.

The invention relates to the technical field of ecological restoration, in particular to an ecological restoration monitoring method and system for a coal mining subsidence area. Obtaining soil recovery state time sequence information; when the soil recovery state at the end point moment of the time sequence information of the soil recovery state meets a soil target state, the time sequence information of the soil recovery state and vegetation planting parameters are input into a vegetation recovery state prediction network, and the time sequence information of the vegetation recovery state is obtained, the vegetation recovery state prediction network is a black box model constructed based on a long-short term memory neural network; and when the vegetation recovery state at the end point moment of the vegetation recovery state time sequence information meets a vegetation target state, performing ecological recovery monitoring on the soil modification coal mining subsidence area executing the soil modification control parameters by taking the soil recovery state time sequence information and the vegetation recovery state time sequence information as monitoring baselines. According to the method, scientificity and effectiveness of cultivated land protection and ecological restoration of the coal mining subsidence area can be improved.

The invention provides a curtain wall decoration strip system, and relates to the field of curtain walls. The problem that the angle of a decoration strip in an existing curtain wall decoration strip system cannot be adjusted at will according to requirements is solved. The curtain wall decoration strip system comprises a first stand column and a second stand column, wherein the first stand column is connected with a curtain wall body through a first connecting assembly; the first decoration strip assemblies are arranged on one side of the first stand column, and the first decoration strip assemblies are rotationally connected with the first stand column through rotating assemblies; the rotating assembly comprises a first steel plate fixedly connected with one side of the first stand column, and a second steel plate fixedly connected with the other side of the first stand column. The aluminum alloy sleeve core is arranged on the end face of the first steel plate, and the first decoration strip assembly is rotationally connected with the first stand column through the aluminum alloy sleeve core. According to the scheme, the angle of the decoration strip in the curtain wall decoration strip system can be adjusted at will, meanwhile, the curtain wall decoration strip system has the advantages of being simple in construction process, convenient to construct, attractive in structure and the like, construction efficiency is improved, production cost is reduced, and meanwhile installation precision is guaranteed.

The utility model discloses diffusion dialysis complete equipment which comprises a frame and a diffusion dialysis device, the diffusion dialysis device is installed on the frame, and a pure water tank, a constant-temperature circulating water tank and a waste acid water tank are further arranged on the frame. The pure water tank, the constant-temperature circulating water tank and the waste acid water tank are all connected with the diffusion dialysis device through pipelines, the diffusion dialysis device comprises a first clamping plate, a second clamping plate, two constant-temperature circulating water compartments and a diffusion dialysis main body which are connected through pipelines, and the two constant-temperature circulating water compartments are located on the two sides of the diffusion dialysis main body; the first clamping plate and the second clamping plate are located on the two sides of the two constant-temperature circulating water compartments respectively, all dispersing components of a diffusion dialysis experiment are integrated on the frame, experiment operation is facilitated, occupied space is reduced, and the temperature of the diffusion dialysis experiment can be adjusted.

The invention discloses a negative pressure adsorption type short-distance carrying mechanism for color steel plates, which is applied to the technical field of short-distance carrying mechanisms for color steel plates. The conveying base is fixedly provided with a sliding assembly used for driving the conveying base to slide, the conveying base is movably connected with an adjusting base based on a universal adjusting assembly, and the adjusting base is slidably connected with a mounting base in the vertical direction based on a telescopic sliding assembly. A rotating seat is rotationally connected to the mounting seat based on the rotating adjusting assembly, and a folding carrying seat used for mounting the negative pressure adsorption assembly is rotationally connected to the rotating seat based on the rotating folding assembly; the invention has the technical effects of simple structure, small occupied space and convenience in adjustment.

The application provides a kind of lighting device, belongs to lighting and smart home technical field.It includes: outer pole, cavity is formed in outer pole inside and the first opening is formed in outer pole one end and is communicated with cavity;Inner pole, inner pole is at least partially through the first opening and is set in the cavity of outer pole and inner pole can be driven relative to outer pole sliding;Light source, light source is arranged at the end of inner pole and the position of light source can be changed when inner pole is driven relative to outer pole sliding;Cable, one end is connected on power output part, the other end is arranged in outer pole and inner pole and is connected with light source for power supply to light source;Tensioning assembly, it is used to pull cable to make cable in outer pole and inner pole always in tension state, wherein the tension of tensioning assembly acting on cable is less than the maximum static friction force between outer pole and inner pole.In the application, inner pole can slide in outer pole, which can realize the adjustment of light source illumination area, and wire can be hidden in the pole, wire is not exposed, and the appearance effect is better.

The present invention discloses a loosening bullet for underground tubular couplings, comprising a connecting joint, a partition detonating joint, a porous charge shell and a bullet tail which are coaxially arranged from top to bottom; a coaxial detonating cord is arranged in the central through hole of the connecting joint; the partition detonating joint comprises a cylindrical side wall and a bottom plate, a sealed cavity is formed between the bottom end of the connecting joint and the bottom plate, a perforating bullet is arranged in the sealed cavity, and the top of the perforating bullet is in contact with the detonating cord; a circumferential pre-splitting groove is arranged on the outer wall of the cylindrical side wall; a plurality of through holes are arranged on the side wall of the porous charge shell, and a main charge column and a simulated charge column are arranged in the porous charge shell from top to bottom, and the amount of the main charge column can be adjusted by adjusting the height of the simulated charge column; the bullet tail is a conical hollow structure, and a groove arranged circumferentially is arranged on the outer wall of the bullet tail. The loosening bullet of the present invention adopts a partition detonating technology and an exposed charge, and is used for loosening underground tubular couplings.

The present invention provides a comfortable-to-wear glasses structure, belonging to the technical field of glasses. A mounting block fixedly connected to the frame is provided on the frame, a positioning tube is provided at one end of the temple close to the frame, a rectangular plug hole is provided in the positioning tube, two mounting holes are symmetrically arranged in the longitudinal direction of the mounting block, the two mounting holes are interconnected through a guide hole, a torsion spring is provided in the mounting hole, a rotating column is slidably connected in the guide hole, the torsion spring is sleeved on the rotating column, a connecting block is rotatably connected to the rotating column, a plug rod is fixedly provided on the connecting block, the plug rod is slidably connected in the plug hole, two spring columns are respectively located on the upper and lower sides of the positioning tube between the connecting block and the temple, and the two ends of the torsion spring are respectively against between the connecting block and the mounting block. The present invention has the advantages of being able to improve wearing comfort, etc.

The invention relates to the technical field of rehabilitation training, and discloses a rehabilitation training robot with joint torque feedback, which comprises a shell, a cover plate is fixedly mounted on the left side of the top of the shell, a seat assembly extending to the top of the cover plate is arranged on the inner side of the shell, and two outer boxes are fixedly mounted on the right side of the inner wall of the shell. A supporting seat is fixedly installed at the bottom of the shell, a training mechanism extending to the outer sides of the outer boxes is arranged between the inner sides of the two outer boxes, an adjusting mechanism connected with the training mechanism and extending to the right side of the shell is arranged between the two outer boxes, and a fixing mechanism is arranged at the top of the training mechanism; according to the rehabilitation training robot with the joint torque feedback function, the training mechanism and the adjusting mechanism are arranged, the supporting plate slides along the guide rail, the purpose of adjusting the training intensity is achieved, and the purpose of replacing different models is achieved by arranging the fixing mechanism.

This application provides a green laser, which sequentially includes a pump source, a collimating lens, a focusing lens, a first cavity mirror, a gain medium, a Q-switching element, and a second cavity mirror in a first direction; sequentially includes a third cavity mirror and a displacement motor in a second direction; and sequentially includes a first beam splitter, a frequency doubling crystal, and a fourth cavity mirror in a third direction. The third cavity mirror is located behind the second cavity mirror in the second direction, and the first beam splitter is located behind the first cavity mirror in the third direction. This application achieves adjustable cavity length by moving the third cavity mirror in the second direction through the position of the displacement motor. This allows the green laser to achieve a cavity length suitable for different power outputs by adjusting the cavity length, enabling the same green laser to output multiple power stably and continuously. Therefore, a green laser with precisely adjustable cavity length, compatible with multiple high and low power overlapping stable outputs, high integration, and compact structure is obtained.

The utility model discloses a lifting support and a display device, and relates to the technical field of supports, the lifting support comprises a supporting seat, a lifting seat, a first constant force spring, a second constant force spring and a switching assembly, and a sliding cavity is formed in the supporting seat; the lifting seat is slidably arranged in the sliding cavity in the vertical direction; the first constant force spring is arranged on the lifting seat; the second constant force spring is fixedly connected with the supporting base and located between the lifting base and the cavity wall of the sliding cavity. The switching assembly comprises a movable part and a switching structure, the movable part is arranged on the lifting base, and the movable part can do reciprocating motion towards the side where the second constant force spring is arranged relative to the lifting base, so that the movable part is provided with a first load position located above the second constant force spring and a second load position staggered with the second constant force spring; the switching structure is used for driving the movable part to move. The display support aims to solve the problem that the lifting force value of an existing display support cannot be adjusted.

The utility model discloses a universal irrigation nozzle. The sprayer comprises a support, a first rotating module, a second rotating module and a sprayer body. The support, the first rotating module, the second rotating module and the spray head are all of a hollow structure. A water inlet and a first water outlet are respectively formed in two ends of the bracket; the first rotating module comprises a first L-shaped pipe, a first connector and a second connector, wherein the first connector and the second connector are located at the two ends of the first L-shaped pipe respectively. The first water outlet is rotationally connected with the first connector. The second rotating module comprises a second L-shaped pipe, a third connector and a fourth connector, wherein the third connector and the fourth connector are located at the two ends of the second L-shaped pipe respectively. The third connector is rotationally connected with the second connector. And the spray head is connected with the fourth connector. The sprayer has the advantage that the water spraying direction of the sprayer can be adjusted at will. The utility model further discloses a universal irrigation nozzle assembly.

The fatigue test clamp comprises a blade clamping block, a base, an adjusting beam, a balancing weight and a plurality of fixing pieces, and the blade clamping block is used for clamping a blade; the base comprises a chassis and a vertical beam extending in the first direction, the chassis is arranged on the shock excitation table, and a cavity is formed in the end of the vertical beam and used for containing the blade clamping block; the adjusting beam is arranged on the vertical beam and can move in the first direction, and the balance weight adjusting groove extends in the second direction; the balancing weight is located above the balancing weight adjusting groove and can move in the second direction. The multiple fixing pieces are used for fixing the relative position of the blade clamping block and the base, the relative position of the balancing weight and the adjusting beam and the relative position of the adjusting beam and the vertical beam correspondingly. The clamp has good clamp frequency adjusting performance. The invention further provides a high-frequency high-cycle fatigue test experiment method.

The present application belongs to the field of machine tool chip removal device, and relates to a four-direction compatible universal scraper chip removal filtering system and a use method. The system comprises a chip removal machine part, a liquid tank part, a chip collecting vehicle and a packaging part. The chip removal machine part is reversibly installed on the front side or the rear side of the liquid tank part. The overflow port of the chip removal machine part is in communication with the liquid inlet of the liquid tank part. The chip collecting vehicle is arranged below the chip outlet of the chip removal machine part. The liquid tank part is a symmetrical structure and is used for reversible installation of the chip removal machine part, so that the scraper chip removal filtering system is adapted to chip removal filtering work in any one direction of the left front row, the left rear row, the right front row and the right rear row of the same machine tool. The system can realize installation and application of four directions, three heights and twelve configuration forms of the scraper chip removal filtering system, can shorten the development cycle of new equipment, accelerate the product iteration speed, improve the utilization rate of parts, significantly reduce the development, production and maintenance costs, has strong adaptability and can greatly improve the economic benefits.

The utility model discloses an automobile maintenance paint spraying nozzle convenient to replace, and belongs to the technical field of paint spraying equipment, the automobile maintenance paint spraying nozzle comprises a spray gun part main body, an atomization cap and a nozzle body, the outer wall of the spray gun part main body is provided with two dismounting mechanisms, and each dismounting mechanism comprises a sliding groove, a clamping groove and a sliding groove; according to the spray gun part, the dismounting mechanism is arranged, the button drives the moving block to extrude the clamping block, so that the clamping block is separated from the clamping groove, the spray head can be quickly dismounted from the spray gun part main body, the dismounting speed is increased, and during mounting, the spray head drives the clamping block to extrude the spray gun part main body to move into the sliding groove; and when the sliding groove is aligned with the clamping groove, the first spring drives the clamping block to enter the clamping groove and is clamped with the clamping groove, so that the spray head can be quickly mounted on the spray gun part main body, the mounting speed is increased, the time required for replacing the spray head is shortened, and the working efficiency of replacing the spray head is improved.

The present invention relates to a simulated rapid decompression chamber for civil aircraft, characterized in that it comprises a simulated window, a variable adjustment device matched with the simulated window, and a negative pressure exhaust system arranged outside the chamber and connected to the simulated window; the variable adjustment device comprises a template adapted to the simulated window, and a locking member for detachably installing the template on the simulated window; the negative pressure exhaust system comprises a negative pressure tank, a negative pressure pipeline, an electric control gate valve and a negative pressure cover, the negative pressure tank is provided with a vacuum pump, one end of the negative pressure pipeline is connected to the negative pressure tank, and the other end is connected to the negative pressure cover, the negative pressure cover is arranged outside the simulated window, and the negative pressure pipeline is equipped with an electric control gate valve. The present invention realizes the adjustable and controllable process of simulating the loss of confidentiality and decompression of the aircraft. It provides a simulation platform and equipment guarantee for the adaptability training and emergency handling drills of aircraft pilots and crew members.

This invention provides an audio signal gain circuit, an audio system, and a recorder. The audio signal gain circuit includes a switching module, an input resistor module, and a differential amplifier module, each with a high-gain channel and a low-gain channel. The input terminal of the input resistor module is used to receive the original audio signal to be gained, and the output terminal of the input resistor module is electrically connected to the input terminal of the differential amplifier module. The output terminal of the differential amplifier module is used to output the gained target audio signal. The switching module is connected in series with the input resistor module and the differential amplifier module and is used to adjust the actual input resistance of the input resistor module connected to the differential amplifier module. This invention achieves adjustable input resistance, thereby enabling the use of corresponding gain channels in the differential amplifier module to achieve gain processing of audio signals of different formats in different gain channels. While achieving high dynamic range gain processing, it saves hardware consumption, has low cost, and good consistency.

The utility model discloses a laser head subassembly, including fixed base and laser head, the fixed base is provided with the mounting hole of cylindrical structure, the laser head is cylindrical structure, and its one end is used for shooting laser line, its characterized in that, the laser head is installed in the mounting hole and is provided with the activity gap with the mounting hole, the outer cylinder wall of laser head is provided with the annular boss concentric with it, and the circumference of boss at least with the bottom inner wall of mounting hole contacts, the fixed base is provided with first adjusting hole, first adjusting hole with the mounting hole is communicated, and the upper surface of fixed base is penetrated upwards, and the first eccentric axis of first adjusting hole passes through boss, first adjusting hole still is provided with the first adjusting rod of being capable of moving along its axial movement and can at least partially stretch out first adjusting hole downward. In the utility model, the laser head is arranged in the mounting hole of fixed base, and the rotation of laser head is realized through adjusting the first adjusting rod in first adjusting hole, thereby realizing the adjustable of laser head.