278results about How to "Create simple structures" patented technology

The invention provides an efficient dirt removal device. The efficient dirt removal device is arranged in a sewage tank and comprises a pushing element. The pushing element is fixed to a top cover of the sewage tank. The pushing end of the pushing element penetrates out of the top cover and then is connected with a motor. A connecting plate is connected to the output end of the motor and arranged horizontally. Brushes are arranged at the ends of the connecting plate and connected with the connecting plate through springs. A sliding groove is formed in the connecting plate. A sliding block is arranged in the sliding groove. The sliding block is connected with the brushes through a connecting rod. According to the efficient dirt removal device, the brushes are pushed through the pushing element to move up and down in the tank, and the brushes rotate in the tank through the motor, so that dirt on the inner wall of the tank is removed; guiding mechanisms are arranged between the brushes and the connecting plate, so that deflection is prevented when the brushes work. The efficient dirt removal device is simple in structure and convenient to use.

The invention discloses a pair of automatic jet type air drying spectacles, relating to a daily life tool. The pair of automatic jet type air drying spectacles comprises a spectacles frame, fan switches, minicells, ventilation holes, spectacles legs, ventilation ducts, mini-fans, humidity inducing heads, lenses, and exhaust holes. The pair of automatic jet type air drying spectacles is characterized in that the lenses are arranged under the spectacles frame; the exhaust holes are formed in the upper part of the spectacles frame, which is close to outer-side corners, and openings of the exhaust holes are aligned to the lenses; the humidity inducing heads are arranged at the lower part of the spectacles frame, which is close to the outer side; the spectacles legs are arranged behind the spectacles frame; the fan switches are arranged at the upper parts of the fronts of the spectacles legs; the minicells are arranged behind the fan switches at the upper parts of the spectacles legs; mini-fans are arranged at the lower parts of the minicells inside the spectacles legs; the ventilation holes are formed in the tail ends of the spectacles legs; the ventilation ducts are arranged inside the spectacles legs, and the humidity inducing heads are connected with the mini-fans through circuit boards arranged inside the spectacles legs. The pair of automatic jet type air drying spectacles is simple in created structure, is convenient and practical, and automatically removes mist under a wet environment to ensure that spectacles are kept clear without influencing the sight of a user.

The invention relates to a heat exchanger for distillation. The technical scheme is that: the heat exchanger consists of a shell pass and a tube pass, wherein in the shell pass, an upper cylinder body of the shell pass and a lower cylinder body of the shell pass are connected into one body by an expansion joint, both ends of the shell pass are connected with an upper tube plate and a lower tube plate, a heat exchange tube and a central tube pass a baffle plate, both ends of the heat exchange tube and the central tube are connected with the upper tube plate and the lower tube plate, the central tube is arranged on the axis of the upper tube plate and the lower tube plate, a baffle plate is fixed by a distance tube, a lower cylinder of the shell pass is provided with an exhaust and a steam outlet of the shell pass, an upper cylinder of the shell pass is provided with a steam exhaust and a steam inlet of the shell and a shock proof plate is arranged in the upper cylinder body of the shell pass; and in the tube pass, both ends of a lower tube pass cylinder body are connected with a lower tube pass flat cover and the lower tube plate by flanges, and the lower tube pass is provided with a tube pass exhaust and a material charge port; both ends of an upper tube pass cylinder body are connected with an upper flat cover and the upper tube plate by flanges, and the upper tube pass is provided with a material discharge port and a fixed gas discharge port; and the pads are arranged between the upper tube pass flanges and the upper tube plate and between the lower tube pass flanges and the lower tube plate. The heat exchanger is high in gasification rate and good in heat exchange effect.

The invention relates to the technical field of medicine mechanical equipment, and in particular relates to an anti-sticking traditional Chinese medicine ingredient stirrer. The anti-sticking traditional Chinese medicine ingredient stirrer comprises a motor, a rotating shaft, a spherical sealing bin, vibration rods, springs, stop blocks, vibration rings, a material inlet, a groove connection block, a connection shaft, a bracket I, a material outlet, a bracket II and vibration blocks, wherein a vibration device is arranged at each of the upper part and the lower part of the spherical sealing bin and consists of the vibration rod, the spring, the stop block, the vibration ring and the vibration block. The anti-sticking traditional Chinese medicine ingredient stirrer is simple in structure and convenient to use; the problem that medicine ingredients are stuck to a stirring device during stirring is effectively solved; furthermore, the ingredients can be stirred under a vacuum state.

The invention provides a large shaft cross wedge rolling mill which comprises a rack, a balancing device arranged at the top of the rack and a roller device arranged in the middle of the rack. The bottom of the rack is provided with a driving device used for driving the roller device to adjust; the roller device comprises an upper roller and a lower roller which are arranged on the rack, the position, corresponding to the upper roller, of the rack is provided with a limiting mechanism for limiting the movement of the upper roller, and the position, corresponding to the lower roller, of the rack is provided with an adjusting mechanism for adjusting the axial position of the lower roller; and the rack is provided with a guide mechanism corresponding to the position between the upper roller and the lower roller. The large shaft cross wedge rolling mill has the advantages of simple structure, easy adjustment and good universality, can adapt to rolling of products with various specifications through simple operation adjustment, and is beneficial to improving the machining efficiency of the products; and the balancing device arranged on the rack can eliminate assembly gaps of the upper roller or a bearing pedestal together with a pressing servo cylinder, thereby being beneficial to improving the working stability of the upper roller.

The invention provides a portable cable insulation detection device. The device includes a holding rod, wherein a front end of the holding rod is equipped with an E-type fixing frame made of an insulation material, one side of the holding rod close to the fixing frame is provided with a shield, the fixing frame includes a connection body, a main frame body and a branch frame body, the main frame body is equipped with a main detection unit, the branch frame body is provided with an auxiliary detection unit, the main detection unit includes mutually hinged semi-circle detection probes, the two semi-circle detection probes different from mutually-hinged sides are connected through a buckle assembly, each semi-circle detection probe is internally provided with a leakage detection assembly, thesemi-circle detection probes are internally embedded with indicating lamps electrically connected with the leakage detection assembly, the auxiliary detection unit includes an extension arm, and a front end of the extension arm different from one side of the main detection unit is provided with a guide structure. The device is advantaged in that the device is simple in structure, is reasonable indesign, has good portability and can conveniently detect insulation property of the cable, especially for single-hand detection operation, effort and time are saved, and safety is quite high.

The invention provides a parking mechanism which is mounted inside a transmission housing, and comprises a pawl. One end of the pawl is hinged to a pawl mounting frame. A return spring is arranged on the pawl mounting frame. The return spring is connected with the pawl mounting frame and the pawl. A buckle finger is arranged at the front end of the pawl. A parking ratchet is fixedly connected with a drive shaft of a transmission. A clamping groove matched with the buckle finger is formed in the parking ratchet. A parking locking shaft perpendicular to a swing arm and fixedly connected with swing arm is arranged at one end of the swing arm. A pushing rod perpendicular to the swing arm is arranged close to the upper part of the other end of the swing arm. A pawl bulge is arranged at the upper part of the pawl. When the swing arm moves, the pawl bulge is pushed by the front end of the pushing rod, and after the pawl bulge is stressed, the pawl rotates, and the buckle finger is clamped in the clamping groove. The parking mechanism is simple and compact in structure, low in purchasing cost, and high in reliability.

The invention provides a cable restraining device suitable for a robot executer. The cable restraining device comprises an upper half ring, a lower half ring and a cable fixing base. The upper half ring and the lower half ring are the same in radius and are spliced to form an integral circular ring, and the two ends of the lower half ring and the two ends of the upper half ring are fixedly connected. The cable fixing base is of an arc structure, and a plurality of axially-formed arc fixing base grooves are formed in the inner wall of the cable fixing base. A plurality of upper half ring grooves corresponding to the fixing base grooves are formed in the outer wall of the upper half ring. The fixing base grooves and the upper half ring grooves are spliced into cable holes used for fixing a cable. The cable fixing base is fixedly connected with the upper half ring. According to the cable restraining device, the cable is kept close to a robot with the short distance, and meanwhile the problems such as interference caused by cable postures in the using process are solved.

The invention provides a concentration detection system adopting fusion technology. The concentration detection system comprises a gravity-type concentration detection device, a floating-type concentration detection system and a pressure-difference-type concentration detection device respectively connected with a controller, and the three concentration detection devices respectively detect concentration value of a to-be-detected solution in a detection tank and respectively transmit solution concentration information acquired by detection to the controller. Concentration of the solution is detected in a same working condition by respectively using three different sensor detection modes, and three kinds of concentration data are processed to acquire a final concentration value finally, so that concentration detection accuracy is improved greatly.

The invention provides a wall surface color steel plate mounting construction method. A rigid hanging ladder adapting to the height of a wall surface is manufactured firstly, and traveling wheels are arranged at the bottom of the hanging ladder; a guide rail is arranged close to the wall surface in the direction of the wall surface; the hanging ladder is hoisted to a tip on one leeward side of the wall surface of a factory and the tip serves as the initial position for mounting of a color steel plate; the traveling wheels of the hanging ladder are matched with the guide rail, and the upper end of the hanging ladder clamps a factory steel column; after the firmness of the hanging ladder is checked, an operator enters operation platforms on the hanging ladder to mount the color steel plate; and after the color steel plate is mounted at the initial position of the hanging ladder, the hanging ladder is pushed to a next mounting area. According to the wall surface color steel plate mounting construction method and the hanging ladder applied by the same, the structure is simple, operation is convenient, the operator can continuously conduct construction without need of frequently going up and down the hanging ladder in the mounting construction process of the color steel plate of the wall surface, and working efficiency is high; and meanwhile, the safety is high in the construction process, and the hanging ladder does not shake, and is stable and reliable.

The invention innovatively provides an automatic hydrogen peroxide concentration online detection system and detection method. The automatic hydrogen peroxide concentration online detection system comprises an vortex-type circulating stirring unit, wherein the vortex-type circulating stirring unit comprises a titration tank, and a circulating stirring apparatus capable of generating the vortex-type water flow is arranged inside the titration tank. The titration tank adopts the vortex-type circulating stirring structure, and the structure enables the liquid in the titration tank to form strongvortex-type moving fluid, so that the detection time is greatly shortened.

The invention discloses an elastic pile foundation resistant to frost heaving damage. A top connecting module is installed above a frost heaving buffering module, a gravity column module is installed below the frost heaving buffering module, a lifting disc capable of axially sliding in a supporting shaft is installed in the supporting shaft of the frost heaving buffering module, a first rotating shaft seat is fixedly installed on the edge of the lifting disc, the first rotating shaft seat is in shaft connection with one end of a supporting cross beam, the other end of the supporting cross beam is in shaft connection with a second rotating shaft seat, the second rotating shaft seat is fixedly installed on an elastic buffer strip, a buffer net is fixedly installed on the elastic buffer strip, a lead screw is installed in the top connecting module, a driven gear is fixedly installed at the top end of the lead screw, the driven gear meshes with a driving gear, and the driving gear and a crank rotating shaft are fixedly installed. The elastic pile foundation resistant to frost heaving damage can be adjusted according to the actual frozen soil depth of a project; the elastic pile foundation resistant to frost heaving damage can adapt to repeated freezing and thawing, effectively prevent frost heaving and frost pulling, and has a lasting effect; complete dismantling and recycling can be achieved, and the influence on the environment is small; and modularized assembly facilitates later maintenance, and the maintenance cost is reduced.

The invention relates to an artificial hip joint replacing-retracting-exposing positioner which belongs to medical appliances. The top side part and one side part of the n-shaped frame are respectively sheathed with a first elastic clamp seat assembly and a second elastic clamp seat assembly; a draw hook connecting rod and a sharp hook connecting rod are respectively inserted on the first elastic clamp seat assembly and the second elastic clamp seat assembly; a pelvis obturator foramen long-handle draw hook and an acetabula front-edge exposing-positioning sharp hook sleeve are respectively connected to the draw hook connecting rod and the sharp hook connecting rod through an adjustment through hole A and an adjustment through hole B; the ends on both sides of the n-shaped frame are respectively provided with a shallow-layer tissue retracting-positioning hook and a positioning column; a parenchyma retracting hook is sheathed on the positioning column through an adjustment through hole C; a shallow-layer tissue retracting-positioning brace rod is fixed on a shallow-layer tissue retracting-positioning hook; and an acetabula upper edge retracting-positioning pin is arranged on the outer side of the open end of the n-shaped frame. The invention has the advantages of simple structure, convenient use, reliable operation, accurate and stable operative field range, and is beneficial to ensuring the operation quality and enhancing the operation efficiency.

The invention provides a millisecond grade real-time computer system monitoring device which can judge the running status of a real-time control computer within time in millisecond grade, give alarm and carry out protection in case of abnormality of the computer system, and enable the real-time control system to operate more safely. The invention comprises a standard time clock square wave generating circuit, a waveform frequency sorting circuit, a shift circuit, a latch circuit and a system running heartbeat signal detection circuit for detecting operation of the real-time computer system, wherein the standard time clock square wave generating circuit is connected with the waveform frequency sorting circuit which is connected with a shift register, the shift register is connected with the latch circuit, the real-time computer system detection circuit is connected with the shift register, and the latch circuit is also connected with a six freedom degrees motion simulator protection loop. The invention can be applicable to detect normal operating status of the real-time computer system and drive a protective device to carry out protection in case of system abnormality.

The invention discloses an automobile power steering limiter. The automobile power steering limiter is characterized by comprising a ball (1), an outer ring (2), an inner ring (3) and a rubber support (6), wherein the exterior of the inner ring (3) is provided with an outer thread (7) with a rotating angle slightly smaller than a total angle from the maximum left rotation point to the maximum right rotation point of a steering wheel; the inner ring (3) is hollow and the inner diameter of the inner ring is slightly bigger than the outer diameter of a rotating shaft of the steering wheel; a key slot (5) is formed in the outer ring (2); one end of the external of the outer ring (2) is sleeved with the rubber support (6); the length of the inner ring (3) is greater than that of the outer ring (2); the inner ring (3) is movably sleeved inside the inner ring (2); the ball (1) is arranged for location fit between the outer thread of the inner ring (3) and the key slot of the outer ring (2); and a clamping ring (8) is arranged outside one end of the inner ring (3). The ball (1), the outer ring (2) and the inner ring (3) are made from steel. The automobile power steering limiter is simple in structure, reliable in performance and convenient to install; and on the premise that the other performance of the automobile is not affected, the limiter is capable of lowering the energy consumption of an automobile, prolonging the service life of spare parts of a mechanical hydraulic power steering system and enhancing the reliability of the mechanical hydraulic power steering system.

The invention creatively provides a blind person walking stick which comprises a walking stick body, a bottom pin at the lower end of the walking stick body and a handle at the upper end of the walking stick body. A plurality of anti-skid protrusions are arranged at the bottom of the bottom pin. A radar distance measuring sensor and a barrier alarm connected with the radar distance measuring sensor are arranged at the position, close to the bottom pin, of the walking stick body. The walking stick body is of a stretchable rod type structure, a GPS positioning device and a voice navigator are arranged on the walking stick body, and a fluorescent paste is arranged on the outer surface of the walking stick body; a horn is arranged on the handle. The blind person walking stick is simple in structure and reasonable in design; the height of the walking stick body can be adjusted as needed, the handle is comfortable in touch, and a user will not feel fatigue after using the walking stick for a long time. The walking stick body has the voice navigation function and the distance sensing function, the convenience needed when the user uses the walking stick is greatly improved, the using effect is good, due to the fact that the GPS positioning device is arranged, family members can remotely know the position of the user, and the trouble caused when the user is lost and family members need to find the user around is avoided.

The invention provides an injection gun special for an oilfield wellhead sealing device, comprising a barrel and an injection component; one end of the barrel is provided with an injection head, and the other end of the barrel is provided with a gun rear cover; the injection component includes a push bar and a piston arranged in the barrel, one end of the push bar is connected to a piston, and the other end of the push bar runs through the gun rear cover and extends out of the barrel; the push bar is a threaded bar in threaded with the gun rear cover; the injection head comprises a first connecting portion connected with the barrel and a second connecting portion connected with an injection port of the wellhead sealing device. The injection gun is simple in structure and reasonable in design; by turning the push bar, the push bar pushes the piston to enter filling material, and the filling material is injected into the wellhead sealing device, with good convenience and low labor consumption.

The invention provides a seedling raising pot tray with variable pot hole sizes and belongs to agricultural machinery. The seedling raising pot tray comprises tetrahedral pot holes, wherein each tetrahedral pot hole is defined by a pot hole bottom wall, a pot hole left side wall, a pot hole right side wall, a pot hole front side wall and a pot hole rear side wall, the pot hole front side wall and the pot hole rear side wall adopt a mutually symmetrically configured involute gear tooth surface shape, notches penetrate through the middles of the pot hole left side wall and the pot hole right side wall from top to bottom, each of the pot hole left side wall and the pot hole right side wall is divided into a front part and a rear part by the corresponding notch, the whole pot hole bottom wall adopts a cambered shape bulged towards the inner side of the pot hole, and a cross section of an upper connecting belt at the upper ends between the tetrahedral pot holes which are adjacent front and back is arc-shaped. The pot hole sizes are increased when pot seedlings are taken from the pot tray, the adhesion force between pot seedling nutrition media and pot hole circumferential walls of the seedling raising pot tray is reduced, and the seedling raising pot tray has the characteristics of novel, reasonable and simple structure, small seedling emergence resistance and convenience, rapidness and reliability in seedling taking, and is particularly suitable for mechanized farming.

The invention provides a paper folding shaping device for filter paper of a filter. The paper folding shaping device for the filter paper of the filter comprises a plurality of upper paper folding wheels and a plurality of lower paper folding wheels which are engaged with each other, wherein the upper paper folding wheels are arranged on a driving device; the upper paper folding wheels and the lower paper folding wheels are separately arranged on an upper disc and a lower disc; the specifications of the upper paper folding wheels are different, and the specifications of the lower paper foldingwheels are also different; the upper disc and the lower disc are separately connected with a rotating device; a left clamping plate and a right clamping plate are arranged on a rack and are separately positioned on the right sides of the upper paper folding wheel and the right sides of the lower paper folding wheels; infrared sensors which are connected with a controller are separately arranged on the upper end surface of the left clamping plate and the lower end surface of the right clamping plate; the lower end of the left clamping plate and the upper end of the right clamping plate are separately arranged at an end of a retractable rod of an eighth hydraulic cylinder and an end of a retractable rod of a ninth hydraulic cylinder; the eighth hydraulic cylinder and the ninth hydraulic cylinder are separately connected with the controller; and a cylinder body of the ninth hydraulic cylinder is arranged at an end of a retractable rod of a horizontal hydraulic cylinder. A paper folding mechanism is subjected to secondary shaping, and the folding effect of the filter paper is good.

The invention provides an automatic closing system for preventing water from entering an engine. The automatic closing system comprises a normally open electromagnetic valve arranged on an air inlet pipe. The electromagnetic valve is electrically connected with a power source through a single-pole switch, wherein the power source is arranged on the outer side of the pipe. The single-pole switch is obliquely arranged, the pole portion of the single-pole switch faces towards the pipe, the single-pole switch is fixed to the outer side of the pipe, and the pipe is provided with a driving device for controlling the single-pole switch. By means of the automatic closing system, the air inlet pipe can be automatically closed when encountering water, water is prevented from entering the engine, the engine is effectively protected, and economic losses are greatly reduced.

The invention provides a support structure of an isolation transformer for railways. The support structure comprises a clamping frame and a slide groove, wherein the slide groove is glidingly connected with a rail, the slide groove is formed by connecting a support plate, a fixing clamping device and a movable clamping device, the support plate is connected with the clamping frame, the fixing clamping device and the movable clamping device are respectively positioned at the two ends of the support plate, the movable clamping device is movably connected with the support plate, a plurality of slide wheels are arranged on the inner wall of the slide groove, and a plurality of universal wheels are arranged under the slide groove. The support structure of the isolation transformer for the railways has the advantages that the slide groove is glidingly connected with the rail, the support seat and other structures of the isolation transformer stably slide on the rail, the manual conveying process of the transformer structure in the installation or maintenance process of the isolation transformer is avoided, the labor is saved, the labor time is shortened, and the production efficiency is improved; one part of the slide groove is fixed, and the other part of the slide groove is movable, so the detachment and installation of the slide groove on the rail are conveniently performed; the universal wheels are convenient for the support structure of the transformer to move on a plane.

The invention belongs to the field of smearing machinery for inner walls of pipes and provides a machining device applicable to the inner walls of the pipes. The machining device comprises a first motor; the first motor is arranged on a workbench and is connected with a rotating shaft; a first bearing block is arranged on the rotating shaft; a nut is arranged on the first bearing block and is connected with the first bearing block by the aid of a first bearing; a screw rod is assembled on the nut; a rolling brush shaft perpendicular to the screw rod and parallel with the rotating shaft is arranged at one end of the screw rod; a second bearing block is further arranged on the rotating shaft; a connecting rod penetrating through the second bearing block is arranged on the second bearing block and is connected with the second bearing block by the aid of a linear bearing; one end of the connecting rod is connected with the rolling brush shaft; brush bristles distributed along the circumference of the rolling brush shaft are arranged on the rolling brush shaft on the right side of the connecting rod; and a supporting device is arranged below the workbench. The machining device is simple in structure, convenient to operate and wide in use range.

The invention innovatively provides a test paper strip ejecting mechanism. A disc-shaped rack bracket is arranged at the middle part of a tray; the rack bracket is fixed; the tray is capable of rotating relative to the rack bracket; a plurality of slots used for storing paper strips are uniformly distributed at the periphery of the rack bracket on the tray on the outer side of the rack bracket; extension lines of center lines of the slots are crossed with the axis of the rack bracket; a rack is arranged on the rack bracket; the lower part of the rack is located in a sliding groove of the rackbracket; the rack is capable of sliding in the sliding groove; the center line of the rack is folded with the diameter of the rack bracket; the lower end surface of the rack is lower than the upper end surfaces of the test paper strips. The test paper strip ejecting mechanism is simple in structure, convenient to use, long in rack ejection length and more extensive in application range.

The invention creatively discloses an efficient energy-saving mosquito-eradication multifunctional table lamp. On the basis of the working principle, lamplight is utilized for attracting mosquitoes to climb into the lamp, an electric field formed by a plurality of turns of coils is utilized for continuously beating the escaping mosquitoes, and the mosquitoes are prevented from escaping; white light LEDs and table lamp / small night lamp function switching are utilized for achieving energy saving and function switching of a table lamp / a small light lamp; and the table lamp comprises a lamp holder (1), a switch button (2), a table lamp button (3), a small light lamp button (4), a transformer circuit board (5), a supply lead and plug (6), an un-modulated 220V alternating-current power source (7), an LED lamp lead (8), a lamp pole (9), a lampshade (10), a light-emitting diode rectifier circuit board (11), a light-emitting diode (12), a lampshade inner wall (13), a mosquito inlet (14), a mosquito outlet (15), a positive electrode coil (16), a negative electrode coil (17), a light transmitting plate (18) and a mosquito inlet conical surface (19). A white light LED is adopted as a light source, and a smooth aluminum plating film is taken as the inner wall; compared with an incandescent light bulb, energy can be saved by more than 10 times; and an adjustable constant-current power circuit is adopted, and the table lamp can work in two states of the table lamp / small light lamp.

The invention provides a steelyard type solar wing 360 degree zero-gravity unfolding system. The steelyard type solar wing 360 degree zero-gravity unfolding system comprises an unfolding frame, a rotational balancing frame and a steelyard assembly, wherein the rotational balancing frame is mounted at the top of the unfolding frame, and comprises a rotating mechanism and a balance beam; the rotating mechanism is fixed on the unfolding frame; the balance beam is fixed to the lower end of the rotating mechanism; the load end of the balance beam is connected with a movable boxboard of a solar wing; the steelyard assembly is arranged below the rotating mechanism, and fixed on the unfolding frame; and load ends of the steelyard assembly are respectively connected with unfolding ribs of the solarwing. According to the steelyard type solar wing 360 degree zero-gravity unfolding system provided by the invention, the unfolding frame, the rotational balancing frame, the steelyard assembly and afixed support can make gravity compensation for the solar wing of a spacecraft when an unfolding test is performed on the ground, so that 360 degree zero-gravity unfolding is realized.

The invention provides a rod bank for testing plant root growth penetrating power and belongs to agricultural scientific research instruments. The rod bank comprises a standard reference rod and a contrast experiment rod and is structurally characterized in that a lower cylinder is coaxially mounted at the lower side part of an upper cylinder through a fixing clamp; a seedbed compaction soil layer and a soil covering layer are sequentially arranged in the upper cylinder from bottom to top, and a river sand layer is arranged in the lower cylinder; a gauze element is arranged between the seedbed compaction soil layer and the river sand layer; the soil bulk densities of the seedbed compaction soil layer in the standard reference rod and the contrast experiment rod are 1.10-1.20 g / cm<3> and 1.45-1.55 g / cm<3> respectively. The structure of the rod bank is simple, the manufacturing cost is low, test operation is simple and convenient, test data are accurate, the application range is wide, and a technical support is provided for basis research of crop seed root growth penetrating power.

The invention provides a pipe inner wall processing system with screw-nut structure, comprising an inner wall coating device and a fixture; the inner wall coating device comprises a first motor arranged above a workbench, the first motor is connected with a rotary shaft, the rotary shaft is provided with a first bearing block, a nut is connected with the first bearing block through a first bearing, a screw is fitted to the nut, one end of the screw is provided with a roller brush shaft perpendicular to the screw and parallel to the rotary shaft, the rotary shaft is also provided with a connecting rod connected with the rotary shaft through a linear bearing, one end of the rotary shaft is connected with the roller brush shaft, the roller brush shaft is provided with bristles, and the fixture comprises two pipe supports arranged on a square base and two symmetrically arranged pipe clamping devices. The screw-nut transmission structure is used herein, and the system is simple in structure, easy to operate, low in cost and applicable to small-scale production and allows for greatly saved labor.

A fuel heater of an engine belongs to an explosive motor. A water inlet pipe is arranged between a triple regulating valve and a fuel heater shell; an engine hot water discharging pipe and an engine hot water input pipe are arranged on the triple regulating valve; a valve core which is provided with a water outlet and a water inlet is arranged in the cavity of the triple regulating valve; a regulating pull rod sleeved with a spring is connected on the valve core; a hot fuel outlet pipe, a cold fuel input pipe and a return pipe are fixedly arranged on the fuel heater shell; an involute helix tube is arranged in the fuel heater shell; a temperature sensor is arranged on the hot fuel outlet pipe; and a digit display temperature meter is communicated with the temperature sensor. The heater of the invention has simple structure, is conveniently assembled, operated and used, has reliable operation, has good preheating effect for diesel oil and high quality, and is in favor of fully pulverizing and burning fuel, promoting the dynamic performance of engine, decreasing fuel consumption and use cost, prolonging the service life of engine and decreasing environmental pollution.

The invention provides an anti-cracking sliding system for kiloton-grade concrete precast beam segments, comprising a sliding device, support devices arranged on the sliding device side by side, and a traction device for adjusting the positions of the support devices; a support assembly comprises a pressure-bearing screw rod which is vertically arranged and a pressure-bearing nut which is screwed on the pressure-bearing screw rod, and a pressure detecting element is arranged between the lower end of the pressure-bearing nut and a support framework; a hydraulic jack which is used for butting the lower end of the pressure-bearing screw rod and can drive the pressure-bearing screw rod to move upward is arranged on a lower distribution beam; an upper distribution beam is arranged at the top end of the pressure-bearing screw rod, and a buffer block is arranged at the upper end of the upper distribution beam; and the sliding device comprises a sliding way, and sliding shoes are arranged on the sliding way. The anti-cracking sliding system provided by the invention ensures the transport stability of the concrete precast beam segments, effectively prevents the problems of posture change, uneven stress and the like of the concrete beam segments due to movement, and can effectively prevent the cracking danger of the kiloton-grade concrete precast beam segments.