114results about How to "Change the contact area" patented technology

The invention discloses a device for analyzing the static contact characteristic of an electrical appliance contact material, which relates to a device for analyzing the characteristic of an electrical appliance contact and is used for solving the problem of the absence of a device for analyzing the changing rules of the pressure and contact resistance of an electrical appliance contact. Two guide rails are vertically and fixedly arranged on the upper end face of a bottom plate; a pressure sensor is fixedly arranged on the upper end face of the bottom plate, and is positioned between the two guide rails; an upper support plate is horizontally fixed at the upper ends of the two guide rails; a lead screw is in threaded connection with a threaded through hole on the support plate; each guide rail is sleeved with a linear bearing; two linear bearings are fixedly connected into a whole through a medium-pressure plate; a step shaft is vertically inserted into a central through hole on the medium-pressure plate, and is arranged with a larger part on the top and a smaller part at the bottom; the upper part of an upper insulating sleeve is sleeved at the lower end of the step shaft; a first wiring terminal sheet is positioned on the lower end face of the upper insulating sleeve; and the lower part of the lower insulating sleeve is sleeved at the upper end of a contact of the pressure sensor. The analyzing device disclosed by the invention is used for analyzing the static contact characteristics of an electrical appliance contact material.

The invention discloses a chemical oxygen generating device. The chemical oxygen generating device comprises a box. A reaction cavity is formed inside the box, a liquid level sensor is arranged on the inner all of the reaction cavity, a discharging opening is formed in the bottom of the box, a first electromagnetic valve is arranged on the discharging opening, an oxygen outlet is formed in the top of the box, a second electromagnetic valve is arranged on the oxygen outlet, and an air pressure gauge is arranged on one side of the oxygen outlet. According to the chemical oxygen generating device, hydrogen peroxide is injected through a feeding opening, pistons are pulled through electric stretchable rods, and the hydrogen peroxide is sucked into piston cylinders and stored, and then is put into a reagent pipe filled with manganese dioxide through the feeding opening; when oxygen needs to be generated, the electric stretchable rods push the pistons to inject the hydrogen peroxide into the reaction cavity, and the hydrogen peroxide is reacted with the manganese dioxide in the reagent pipe; meanwhile, the electric stretchable rods are matched with the pistons, the liquid level height of the hydrogen peroxide in the reaction cavity is changed, the contact area between the hydrogen peroxide and manganese dioxide is changed accordingly, and the oxygen generating rate of the whole device is controlled.

The invention discloses an intelligent heat dissipation method for a high and low voltage switchgear, which comprises a switchgear body. Frame, support plate, heat dissipation fins, heat dissipation pipes, water inlet pipe, water outlet pipe, the first partition, the first drying plate, the second partition, the second drying plate and the third partition, the top shell has a heat dissipation device, including Cooling fan, ventilation flexible pipe, ventilation pipe, dust-proof net, electric rod, open slot in the rear shell, beam, guide sleeve, left vertical beam, right vertical beam, lily window assembly, electric push rod in the bottom shell, upper There is a drive rack, as well as a controller and an external cooling device. The invention can take away a large amount of heat generated by the equipment through the heat dissipation pipes on the left and right sides of the shell, absorb moisture to the maximum, can generate swirling flow, avoid heat dissipation dead angles, and can intelligently adjust the angle of the louvers to realize intelligent control of water circulation.

The invention discloses an intelligent heat dissipation type high and low voltage switchgear, which comprises a switchgear body. Frame, support plate, heat dissipation fins, heat dissipation pipes, water inlet pipe, water outlet pipe, first partition, first drying plate, second partition, second drying plate and third partition, the top shell has heat dissipation device, including Cooling fan, ventilation flexible pipe, ventilation pipe, dust-proof net, electric rod, open slot in the rear shell, beam, guide sleeve, left vertical beam, right vertical beam, lily window assembly, electric push rod in the bottom shell, and upper There is a drive rack, as well as a controller and an external cooling device. The invention can take away a large amount of heat generated by the equipment through the heat dissipation pipes on the left and right sides of the shell, absorb moisture to the maximum, can generate swirling flow, avoid heat dissipation dead angles, and can intelligently adjust the angle of the louvers to realize intelligent control of water circulation.

The invention discloses a novel sealing bowl-shaped plug for a highly intensified diesel engine. The plug is made of a stainless steel material, the excircle sealing surface of the plug is subjected to a micro taper design, the end face of the plug has an arc shape, and the wall thickness of the section of the plug is reduced and uniform; and the diameter of the excircle surface of the bowl-shaped plug is increased, so that radial interference during installation is increased. The novel bowl-shaped plug is arranged in a taphole of a cylinder cover water jacket of the diesel engine or a gas engine in gluing and pressure interference modes; and the shape and size of the novel bowl-shaped plug are subjected to sealing performance analog computation and verification by a computer, and a reliability test performed by a test machine proves that the novel bowl-shaped plug obviously improves the sealing performance of the taphole of a cylinder cover, meets the requirements of the cylinder cover of the highly intensified diesel engine or the gas engine on a heat load and a mechanical load, and improves the sealing performance and using reliability of the whole engine.

The invention discloses a telescopic suspension insulator string, which comprises insulators. The insulators are arranged on a telescopic rod and internally provided with connection sleeves, the insulators are mounted on the telescopic rod through the connection sleeves, and the telescopic rod comprises an internal threaded connection rod and an external threaded connection rod. Two ends of the internal threaded connection rod are provided with connection grooves, two ends of the external threaded connection rod are in threaded connection in the connection grooves in two ends of the internal threaded connection rod, and the connection sleeves of the insulators are connected to an external surface layer of the internal threaded connection rod. The telescopic suspension insulator string hasadvantages that the telescopic rod is formed by the internal threaded connection rod and the external threaded connection rod, two ends of the internal threaded connection rod are provided with the connection grooves, the external threaded connection rod is in threaded connection with two ends of the internal threaded connection rod, a contact area of the external threaded connection rod and the connection grooves is changed by rotating of the external threaded connection rod, and accordingly length of the telescopic rod can be adjusted, and telescopic adjustability of the suspension insulatorstring is realized.

The invention discloses a safety crutch suitable for old people. According to key points of the technical scheme, the safety crutch comprises a retractable crutch rod and a supporting handle arranged at one end of the crutch rod; the other end of the crutch rod is provided with a fixed seat; a disc sleeves the position, above the fixed seat, of the crutch rod, and the disc can move in the axial direction of the crutch rod under the effect of external force; the outer side of the disc is movably connected with a plurality of connecting rods; one ends of the connecting rods are connected to the disc and swing relative to the disc; clamping claws are movably connected to the other ends of the connecting rods and movably connected with the fixed seat, and swing relative to the fixed seat by taking the middles of the clamping claws as the axes; and when the disc moves in the axial direction of the crutch rod, the connecting rods are driven to move up and down to drive the clamping claws to swing so as to achieve close-up and separation between the clamping claws. The safety crutch has the effects that the structure is stable, the contact area between the crutch and the ground can be changed through easy operation, the safety performance is enhanced, and the length of the crutch can be adjusted.

The invention relates to apparatus for conveniently fixing the vein in non-invasive puncture. The apparatus comprises a shell, a display screen, a sensor chip, a near-infrared light processor, and bandages, wherein the shell is of a left-half-turning n-shaped structure, the shell comprises an upper shell and a lower shell, the display screen is arranged at the middle position of the upper surfaceof the upper shell, the near-infrared light processor is arranged at the middle position above the display screen, the sensor chip is arranged below the display screen, a power switch is arranged on one side of the sensor chip, the lower shell is provided with a puncture through hole, the bandages are fixedly arranged on two sides of the lower shell, and bandage surfaces on two sides are providedwith matching Velcro. The advantages of the apparatus are as follows: the apparatus uses bandage compression and is combined with the visual operation screen to perform venous puncture on a patient, and mainly uses the screen or the development on the skin to guide a doctor and nurse to confirm the position, depth and direction of the vein, and at the same time the bandages can help to fix a venous blood vessel at a puncture site, so that infusion only once is facilitated, and the repeated needle insertion is avoided.

The invention relates to the technical field of medical care, and discloses a highly practical walking aid, comprising a support body, an elastic pad is fixedly installed on the upper surface of the support body, and one end of the bottom of the support body is fixedly connected with a width adjusting device , the width adjusting device includes a first adjusting frame, the first adjusting frame is provided with a first adjusting hole, the other end of the bottom of the support body is fixedly connected with the second adjusting frame, and one end of the second adjusting frame is connected to the first adjusting frame through the first bolt. The adjustment frame is threadedly connected, the outer wall of the first supporting leg is fixedly connected with the first connecting rod, and a handle is fixedly connected with one end of the first connecting rod. This practical walker, by setting the friction adjustment device, uses the third bolt to change the contact area between the brake pad and the driving wheel, and achieves the effect of changing the friction force between the drive wheel and the brake pad, thereby changing the walking aid. The ease of operation is suitable for patients in different health processes, which improves the practicability of the device.

The invention discloses a semiconductor temperature difference power generation parking heater. The semiconductor temperature difference power generation parking heater comprises a shell with a chimney, a combustion chamber with a flue gas outlet is arranged in the shell, a combustor is arranged in the combustion chamber, the exterior of the front end of the combustor is provided with a combustion-supporting air static pressure cavity, the back end of the combustor is provided with an air outlet hole, and the air outlet hole communicates with the interior of the combustion chamber through ceramic foam; and the side wall of the end, close to the combustor, of the combustion chamber is provided with a flue gas outlet, the flue gas outlet is connected with the chimney, a flue gas channel is formed between the inner wall of the combustion chamber and the combustor, and flue gas passes through the flue gas channel between the inner wall of the combustion chamber and the combustor, passes through the flue gas outlet and then is exhausted from the chimney. According to the semiconductor temperature difference power generation parking heater, both heat energy and electric energy are supplied, full utilization of fuel is achieved, the utilization efficiency is improved, and the semiconductor temperature difference power generation parking heater is widely used for warming of vehicles such as long-distance trucks and passenger cars.

The invention discloses a synchronous telescopic electric soldering iron heat dissipation frame. The synchronous telescopic electric soldering iron heat dissipation frame is composed of a step motor, heat dissipation blocks, a main body, a toothrow, a resistor, a control module, a sensor, a diode and a sleeve and is characterized in that electric soldering iron is connected with the sleeve through a supporting rod, the sensor is designed above the tail end of the sleeve, the main body is arranged at the tail portion of the sleeve, the left side and the right side in the main body are respectively provided with one heat dissipation block, the step motor is installed in the middle of the main body, and a gear of the step motor corresponds to the toothrow. A first foot and a second foot of the control module are connected with the step motor, a third foot is connected with the sensor, and a fourth foot is connected with one end of a power plug through the diode. The other end of the power plug is connected with a fifth foot, and the resistor is connected between the fifth foot and a sixth foot in series. The synchronous telescopic electric soldering iron heat dissipation frame has the function of changing the contact area between the heat dissipation blocks and the air according to different temperatures of a soldering head so as to dissipate heat of different heat conduction area.

The present invention provides a sampling device for extracting smoke from high-temperature flue gas. The device comprises a collecting assembly, a filtering assembly, a supporting assembly and a water curtain assembly. By applying the technical scheme, the effect that the overall structure is precise and simplified is achieved; water flow is guided by a flow limiting curved surface and a flow guiding surface in the water curtain assembly, and the minimum cross-sectional position between the flow limiting curved surface and the flow guiding surface is changed along with water flow speed conditions; when the water flow flows through a gap between the flow limiting curved surface and the flow guiding surface, it can be ensured that the water flow at an outlet stays in a flowing downward state, and a uniform water curtain is formed along the circumference; when the flue gas passes through the water curtain, the smoke carried in the flue gas is captured by the water curtain, and collectionof the smoke is facilitated; the smoke carried in the high-temperature flue gas is captured by the water curtain, then falls into the collecting assembly along with the water curtain and is quenchedby water so that a further chemical reaction of the smoke can be prevented, and therefore original material phase compositions of the smoke is maintained. Through design of the filtering assembly, thewater and a smoke sample can be effectively separated, and convenience is provided extraction of the smoke sample.

The invention discloses a nested multifunctional shear test device and a test method. The device is matched with a plurality of cylindrical sleeves which have different sizes, can be placed in a seamless nesting manner and have outer circle and inner circle structures, a plurality of cylindrical sleeves which have different sizes and have outer circle and inner square structures, and a plurality of force transmission plates matched with the cylindrical sleeves. According to the invention, cylindrical sleeves which can be nested are arranged in the upper and lower shearing boxes in a matched manner, so that the shearing area of a soil sample shearing test or the contact area of soil and a geomembrane sample in a geomembrane shearing test is changed; by controlling the detachable baffle andthe baffle and changing the shearing mode, not only can a direct shearing test of soil and a one-way shearing test of a geomembrane be carried out, but also a two-way shearing test of the geomembranecan be carried out.

The invention discloses a pipeline outer wall omni-directional rapid detection robot, which comprises two guide rails, two moving trolley modules, two supporting wheel modules, a detection module and a control module, and is characterized in that the moving trolley modules and the supporting wheel modules are sequentially and alternately arranged at 90 degrees, and each moving trolley module comprises a trolley body and four wheels connected to two sides of the trolley body; the wheels are driven by a stepping motor, the stepping motor is connected with the wheels through a harmonic reducer, tires of the wheels are rubber tires, the detection module is installed on one guide rail, and the servo motor drives rolling wheels to drive the detection module to move on the guide rails. The device has the advantages of compact structure, compact and flexible, light weight, high integration, stable operation, high work efficiency and low cost, can be used in a narrow region, can comprehensively and systematically detect the condition of the outer wall of the pipeline, can normally work on magnetic-conducting and non-magnetic-conducting wall surfaces, can adapt to the sizes of the outer walls of different operation pipelines, has a wide application prospect, and is beneficial to popularization and application.

The invention discloses a sewage treatment device which comprises a treatment pond. One side of the treatment pond is communicated with a feeding pipe, the side, away from the feeding pipe, of the treatment pond is communicated with a discharging pipe, the bottom of the inner side of the treatment pond is fixedly connected with a precipitation frame, and the outer side of the discharging pipe is provided with a filtering frame. The position, close to the filtering frame, of the outer portion of the discharging pipe is sleeved with a bearing, the side, away from the discharging pipe, of the filtering frame communicates with a discharging pipe, a separation device is installed in the filtering frame, a filtering device is installed on the inner wall of the filtering frame, and a clearing device is installed on the position, close to the filtering device, of the inner wall of the filtering frame. A motor is mounted outside the filtering frame. The invention relates to the technical field of sewage treatment. According to the sewage treatment device, the purpose of deeply filtering sewage is achieved, the contact area of the filter screen can be changed along with the size of water flow, and the sewage treatment efficiency is improved.

The invention relates to a rowing paddle, in particular to a rowing paddle conveniently adjusting and controlling the boat speed. The rowing paddle comprises a fixing seat, a gearbox component, a control handle component, a rotary seat component, a rowing paddle component, a push-pull seat component and a hinging board. The gearbox component is fixedly connected to the right side of the top end ofthe fixing seat; the rotary seat component is connected to the left side of the top end of the fixing seat in a running fit mode; the lower end of the control handle component is connected to the inside of the gearbox component in a sliding fit mode; and the left end of the control handle component is fixedly connected with the right end of the push-pull seat component, the push-pull seat component is connected to the upper end of the rotary seat component in a sliding fit mode, and the left end of the push-pull seat component is hinged to the middle end of the rowing paddle component. The rowing paddle conveniently adjusting the boat speed can be conveniently controlled by a green hand, the gearbox component is arranged in the rowing paddle conveniently adjusting the boat speed, and a rowing person can adjust the rowing pushing distance of the rowing paddle component according to the actual requirement.

The invention discloses a water resistance load adjusting device. The water resistance load adjusting device comprises a hollow water resistance tank, the bottom plate of the water resistance tank isprovided with a drainage pipe, an overflow pipe is arranged in a sleeve mode inside the drainage pipe, the outer wall of the lower portion of the overflow pipe is in movable sealed connection with theinner wall of the upper portion of the drainage pipe, the outside of the top plate of the water resistance tank is provided with a transmission fixing base which is provided with a motor, the outputend of the motor is drivingly connected with a rack through a gear, and the lower end of the rack movably penetrates through the transmission fixing base and is connected with the overflow pipe; the water resistance load adjusting device also comprises a water inlet pipe, the water outlet of the water inlet pipe is communicated with the cavity of the water resistance tank, the water inlet pipe isprovided with an adjusting valve, and the control end of the adjusting valve is electrically connected with a controller. Through driving connection between the gear and the rack which are self-locked, the w water resistance load adjusting device simplifies the adjusting structures of existing load devices, thereby facilitating water resistance adjustment, changing the water volume inside the water resistance tank, greatly enlarging the resistance adjusting range and reducing the investment cost of existing load resistance devices.

An automatic retractable heat dissipation frame of an electric soldering iron is mainly formed by a heat conduction hole, a main body, radiating blocks, wax bodies, springs, an iron stand and a sleeve. The automatic retractable heat dissipation frame is characterized in that the iron stand is connected with the sleeve by means of a supporting rod, the main body is installed at the tail end of the sleeve, the heat conduction hole is designed in the middle of the main body, two sides of the heat conduction hole are respectively provided with a radiating block making the heat conduction hole as the center, the wax bodies are filled between the radiating blocks and the main body, and the upper side and the lower side of each radiating block and the upper side and the lower side of the main body are respectively provided with a spring. The electric soldering iron penetrates through the sleeve, a welding head is inserted into the heat conduction hole, the temperature of the welding head is transmitted to the wax bodies by means of the main body, the wax bodies are heated and expanded to push the radiating blocks to extend to two sides of the main body, and when the temperature of the welding head is reduced, the wax bodies shrink, and the springs push the radiating blocks to return to original positions. The automatic retractable heat dissipation frame has the advantage that according to different temperatures of the welding head, contact areas between the radiating blocks and air are changed, so heat dissipation of different heat conduction areas is achieved.

The invention related to a phase change memory element and a manufacturing method thereof. The phase change memory element comprises a dielectric layer, a metal barrier layer, a heater, an insulating layer, and a phase change layer. The dielectric layer has a surface and a channel which runs through the dielectric layer. The metal barrier layer serves as the lining of the channel. The heater is arranged in the channel and includes a needle-shaped part and a cylindrical part, and the needle-shaped part protrudes from the surface of the dielectric layer. The insulating layer is arranged on the surface of the dielectric layer, and covers part of the heater. The phase change layer is arranged on the surface of the dielectric layer, and contacts the needle-shaped part of the heater. According to the method of the invention, the contact area between the heater and a memory is changed to achieve high current density so as to improve the heat conversion efficiency of the heater.

The invention discloses a three-stage reverse centrifuging extracting device for pharmacy. The three-stage reverse centrifuging extracting device comprises a base, wherein a first extracting tank is fixedly arranged at one side of the top end of the base, and is connected with a third extracting tank through a first charge pipe; one side of the third extracting tank is connected with a medicine discharge pipe; a support rod is welded with the bottom end of one side of the third extracting tank; a movable block is welded with the bottom end of the support rod, and is movably arranged in an opening groove; the opening groove is arranged on the base; the bottom part of the third extracting tank is connected with a residue discharge pipe; a damping gasket is fixedly arranged at the top end ofthe third extracting tank. The three-stage reverse centrifuging extracting device has the advantage that the movable rod is screwed into a thread groove of a fixed block by threads, and can be rotatedin the thread groove according to actual conditions, the extending length of the movable rod can be adjusted, and the contact area with extracting medicine liquor is changed, so that the centrifuge force field is changed, and the flexibility is higher.

The present invention relates to an input device for game machine. An input device for a game machine for inputting signals to a game machine using a computer, including: at least one control member projecting to the outside of a casing; a movement-transmitting member formed around the control member and operatively associated with the movement of an operating point of the control member, the movement-transmitting member being provided with a plurality of conductive elastic members; and a board provided in the casing and having formed thereon resistors corresponding to the conductive elastic members, the conductive elastic members changing the area of contact between the conductive elastic members and the resistors according to a direction of movement and a tilt angle of the operating point of the control member.

The invention discloses a pressure-adjustable device for a pressure vessel, and further discloses an implementation method of the pressure-adjustable device for the pressure vessel. The pressure-adjustable device comprises a vessel bearing mechanism and a pressure adjusting mechanism, and one end of the vessel bearing mechanism is connected with the pressure adjusting mechanism. According to the device, the pressure in a tank body can be monitored in real time through a pressure measuring probe, a pressure numerical value is transmitted to a control box to be analyzed and processed, if it is judged that the pressure exceeds or is lower than a preset parameter, a first electromagnetic valve and a hydraulic oil cylinder are synchronously opened, and the hydraulic oil cylinder drives the cylinder rod to push an extrusion piston to move upwards or downwards; and therefore, the pressure at the bottom of the inner cavity of an upper pressure cylinder is reduced or increased, and air flow inthe tank body is conveyed into the upper pressure cylinder through a pressure pipeline to be subjected to pressure relief, or the air flow in the upper pressure cylinder is conveyed into the tank bodythrough the pressure pipeline to realize pressurization. Compared with a common pressure vessel, the pressure vessel has the advantage that the pressure value in the vessel can be conveniently adjusted by utilizing the motion state of the extrusion piston.

The invention provides a multi-direction flexible manipulator. The multi-direction flexible manipulator comprises at least one adsorption assembly for generating adsorption force and at least two direction control assemblies. The adjacent direction control assemblies are movably connected; the adsorption assemblies and the direction control assemblies are connected; each direction control assemblycomprises at least two first pipes, and first fluids are arranged in the first pipes; and the first fluids in the adjacent first pipes are different in volume. According to the multi-direction flexible manipulator, through the structure that the adsorption assemblies and the direction control assemblies are combined, objects can be efficiently grasped, meanwhile, multiple degrees of freedom are achieved, multi-direction adjusting can be achieved, and the multi-direction flexible manipulator has the advantages that the structure is simple, and operation is convenient.

The invention relates to a preparation method of a fragrance persistent apple essence material, and belongs to the technical field of daily chemical materials. The method adopts magnetic blank microspheres to adsorb and load apple essence materials, as the magnetic microspheres are artificial derivatives of natural chitosan, the magnetic microspheres not only have the properties of natural chitosan materials, but also have a microporous structure, the microporous structure enables the magnetic microspheres to have large specific surface area, strong adsorption performance and easy adsorption of some liquid substances, and simultaneously the release phase of the solid surface of the slow-release preparation and the release phase entering the solid micropores of the slow-release preparationare effectively prolonged; by loading the essence material into the magnetic chitosan material, as there are many micropores on the surface of the microsphere, essence molecules enter the inside of the dextrin microspheres through the micropores and are connected with binding sites in the material; and as the material has more pores and larger specific surface area, the adsorption and lasting release performance of the material are further improved through the improvement of the magnetic microspheres.

The invention belongs to the technical field of sports shoes and particularly relates to a sports shoe for running. The sports shoe for running comprises a shoe sole and a shoe body, and a first cavity is formed in the shoe sole; the first cavity is internally provided with a double-head motor, a first movable plate, first springs, elastic adjustment modules, second movable plates, second springsand a first rotating shaft, and the upper end of the shoe sole is provided with first through holes and second through holes both of which are provided with one-way valves; each elastic adjustment module comprises a first cam, a first gear, a second gear, a second cam, a synchronous belt pulley and a synchronous belt. By changing the compression amount of the second springs, the elasticity of theshoe sole is adjusted according to the demand of a user in order to adapt to different environments, and the comfort is improved; the position of the motor can be changed along with downward pressingof an elastic shaft, damage of the motor is avoided, and the service life of the motor is prolonged; air circulation is achieved between the shoe body and the first cavity, the effect of drying the interior of the shoe body is improved, and a moisture environment in the shoe body is improved.

The invention discloses a full-diameter shale reservoir core bedding fracture hydration strength experimental evaluation method and belongs to the field of unconventional oil and gas exploration. Themethod is characterized by comprising the following steps that: a, a full-diameter rock core is selected; b, the full-diameter rock core is drilled along an axial direction; c, a stainless steel pumping liquid pipe sleeved with a sealing rubber sleeve is arranged into a hole; d, annulus pressurization is performed on the stainless steel liquid pumping pipe and the sealing rubber sleeve; e, vertical pressure and confining pressure are applied to the rock core simultaneously; f, liquid is injected into the stainless steel liquid pumping pipe, and a tracking pump is started to monitor pumping pressure; g, whether an experiment is to be terminated or experiment parameters are to be changed is determined; h, the rock core is taken out; i, the vertical pressure or confining pressure is changed;j, after the stainless steel pumping liquid pipe is lifted multiple times, pumping injection pressure change and pumping injection quantities monitored by the tracking pump are obtained in unit time;and k, the hydration strength of the rock core is evaluated through a gas flow ratio. With the method adopted, shale gas reservoir hydration characteristics can be deeply understood; shale reservoir yield increase transformation theories are enriched; and shale reservoir yield increase is facilitated.

The invention discloses an adjustable violin mute and an adjusting method thereof. The mute includes a base body, lever adjusting pieces, a hinge, fine adjustment screws and damping rubber strips; thebase body is a five-tooth comb structure, and a slot is arranged in the middle of the direction of the thickness of the base body for clamping the base body above the bridge of the violin; the leveradjusting pieces are respectively arranged in the base body and at the two sides of the slot, the upper parts of the two lever adjusting pieces are connected by the hinge, and the middle parts are connected with the fine adjustment screws for adjusting the distance between the two lever adjusting pieces; and the damping rubber strips are vertically installed on the inner sides of the base body andon both sides of the slot. The adjustable violin mute adopts a lever adjustment technology to solve the problem of poor muting effect of the mute caused by differences in the sizes of different bridges, and can solve the problems of the affected muting effect caused by irreversible deformation due to aging of materials, plastic deformation of rubber materials and the like after installation of common mutes in different sizes of bridges.

The medical bed includes a bed frame and a bed board, and a lifting plate is arranged on the bed board, and the lifting device is installed under the bed board to connect with the lifting board; a tilting board is hinged on the bed board, and the tilting device is installed under the bed board to connect with the tilting board. Lift the part of the human body through the lifting plate, relieve the local force on the human body, reduce the burden on the human body, and reduce the occurrence of bedsores and other diseases; by tilting the plate, it can help the human body roll over and reduce the workload of the nursing staff.

The invention discloses an improved dental curette in stomatology, which comprises a scraping blade and a scraping handle. Both ends of the scraping handle are fixed with scraping blades. The connecting part and the scraping head, the connecting part is straight or bent, the scraping head is a spoon-shaped scraping head, the side of the spoon-shaped scraping head is provided with an arc-shaped gap that conforms to the anatomical structure of the outer contour of the tooth, and the arc-shaped The two ends of the notch are smoothly transitioned to the spoon-shaped scraping head of the present invention; the traditional curette can only point contact with the teeth when scraping tissue, but the spoon-shaped scraping head with arc-shaped notch of the present invention, Through the matching of the arc-shaped notch end and the teeth, the contact area can be changed, so that the point contact becomes surface contact, and the operation can be performed efficiently; The unique design increases friction, and the design of the telescopic part can change the length of the overall scraping handle.

A friction generator according to embodiments of the invention comprises a stator, an electrode layer, a rotating shaft, a rotor and a polymer film, the surface of the stator is covered with the electrode layer, the rotating shaft penetrates through the stator, the stator cannot rotate along with the rotating shaft, the rotating shaft is sleeved with the rotor, the rotor and the stator are oppositely arranged at intervals in the axial direction of the rotating shaft, the rotating shaft can drive the rotor to rotate so as to enable the rotor and the stator to relatively slide, the polymer film is connected with the surface, facing the stator, of the rotor, the polymer film is in an arch shape, the polymer film is in an arc shape, and the top of the polymer film is in contact with the electrode layer. The friction generator has the advantages of being safe, reliable, high in adaptability and long in service life.