64 results about "Friction Problem" patented technology

A vertical shaft maglev wind power generator is composed of vanes, a rotary shaft, a power generator, a radial magnetic bearing, an axial TDOF magnetic bearing, an upper protection bearing, a lower protection bearing, an upper protection bearing retainer ring and a lower protection bearing retainer ring; the rotational part and the stationary part of the fan are not in mechanical contact, the mechanical friction in the fan is completely eliminated and the FDOF levitation of the fan rotor is realized. The axial magnetic bearing of the fan supplies gravity offset through 4 stator magnetic poles and the effect of a suction disc and performs axial translation and two radial rotational DOF control on the rotor; and the radial magnetic bearing finishes the two radial translation control of the fan rotor. The invention has reasonable layout of the components, completely eliminates the friction problem of the vertical shaft fan bearing, greatly reduces the starting wind speed of the wind power generator and improves the wind energy utilization rate.

The invention relates to a method for testing cutting and bonding friction characteristics with a point-contact opened-closed type pin-disc friction system which is structured by a friction test platform transformed by a lathe. Aiming at the research requirements on the cutting friction problem and through the design of a pin-disc structure and the combination of lathe space motion trail, an opened-closed type system can be structured, and the cutting friction under an extreme working condition can be simulated; and an acting force of a contact interface can be measured by utilizing a Kistler piezoelectric force meter, a tangential force component caused by material elasticplastic deformation can be removed by combining a finite element simulation method, and thus a bonding friction factor can be obtained. The method disclosed by the invention is mainly used for testing and analyzing the friction characteristic of cutters in the cutting process. A main body of equipment is common equipment in a manufacturing laboratory, and has the advantages of good rigidity, simple structure, easy implementation and the like.

The present invention discloses a multilayer neural network-based motor position servo system friction compensation control method and belongs to the electromechanical servo control field. According to the friction compensation control method, a neural network and the idea of adaptive robust control are combined, so that a multilayer neural network observer-based adaptive robust controller is designed; and a multilayer neural network is adopted to compensate complex uncertain items in nonlinear friction, and at the same time, an adaptive robust controller is designed to estimate uncertain parameters in a system and compensate external disturbances and the approximation errors of the neural network. With the control method designed by the invention adopted, the nonlinear friction problem ofa motor servo system can be solved, and the excellent tracking performance of the motor servo system can be ensured.

The invention relates to a push-type elastic balloon pump, which comprises an elastic balloon, a pump body, a pressure lever, an inlet check valve, an outlet check valve, a nozzle, a bottle cap and the like, wherein the lower edge of the elastic balloon is impacted into the pump body to form seal. The elastic balloon is pushed with a hand to deform, the intracavity pressure of the balloon rises, and the inlet check valve and the outlet check valve are opened and closed to discharge liquid through the nozzle; the push is stopped, the elastic balloon is reset to lower the intracavity pressure of the balloon, and the inlet check valve and the outlet check valve are opened and closed to suck the liquid through a suction pipe. A piston and a reset spring of an original piston pump are replaced by the elastic balloon functionally, so that the height of a pump cylinder is greatly reduced. The friction problem brought by dynamic seal of the piston of the original piston pump is also solved by the push-type elastic balloon pump, and therefore, labor is saved. The push-type elastic balloon pump with double cavities can be put in a comb, and the comb becomes a hair-coloring comb by configuring comb teeth, a comb handle and two bags of hair-coloring liquid. The push-type elastic balloon pump is simple in structure and low in cost, is convenient for various aesthetic modeling and is in favor of beautifying life.

The invention discloses an electromagnetic force testing device of a high-speed solenoid valve for an automobile braking system, which comprises: a fixing plate including a bottom plate and a side wall; an electromagnetic force detection part which is arranged on the bottom plate, connected with a valve core of the high-speed solenoid valve and is used for detecting the change of the electromagnetic force of the high-speed solenoid valve in real time; an air gap adjusting part which is vertically fixed on the side wall and used for adjusting an air gap between a static iron and a moving iron of the high-speed solenoid valve; a high-speed solenoid valve fixing part which is arranged above the electromagnetic force detection part and is used for fixing the whole high-speed solenoid valve toserve as a test object; and a displacement detection part which is arranged above the high-speed solenoid valve fixing part and used for detecting displacement of the valve core of the high-speed solenoid valve. The electromagnetic force testing device of the invention can realize static and dynamic test of the electromagnetic force of the high-speed solenoid valve in the automobile braking system, has good integrity by using the whole high-speed solenoid valve as the test object, avoids the friction problem of the moving iron through vertical test, and has a compact structure and high test precision.

The invention provides a fully water-lubricated super-pressure plunger water pump, mainly comprising a cavity, a live spindle and a plunger flow-distribution unit; the plunger flow-distribution unit comprises a flat valve assembly and a plunger slipper assembly; the plunger slipper assembly is used for dividing the cavity into a pressure cavity and a lubricating cavity which are independent from each other; the plunger slipper assembly carries out reciprocating motion by the driving of the live spindle so that the flat valve assembly sucks in water and discharges water through a water pump inlet and a water pump outlet, and water is simultaneously conveyed to the lubricating cavity through the water pump inlet so as to provide fluid to the rotating unit for lubricating and realizing full water lubrication. The flat valve assembly is designed integrally, and the assembly can be replaced quickly when maintenance so as to shorten maintenance time; the plunger is a stepped structure, the cylindrical surface thereof is provided with recesses, and the bottom of the slipper is provided with a stepped support cavity, thereby solving the wearing and friction problem of the plunger / plunger sleeve pair and slipper / sloping cam plate pair under high-speed heavy-duty condition, and prolonging the service life of the water pump.

The invention relates to the petroleum machinery technical field, in particular to a horizontal bailing device for an oil well and a bailing method using the same. The invention provides the horizontal bailing device for the oil well and the bailing method using the same to solve a problem of sealing property for a check valve in the prior bailing process and a problem of frictions between a pump body of a bailing pump and a bushing and between the pump body of the bailing pump and a coupling, wherein, a piston rod, a drainage hole, an upper valve, a piston barrel, a hard piston, a soft piston, a desilting pipe and a tool for cutting and pushing sands are arranged in sequence from a turning position of the bailing pump to the other end of a horizontal segment inside the pump body; a sand blocking short circuit is arranged between the piston barrel and the desilting pipe, and a centralizer is arranged on the pump body of the horizontal segment; the tail end of the horizontal segment of the bailing pump is provided with a bottom valve and a sand shovel, wherein, both the upper valve and the bottom valve are check valves, and a valve core and a valve seat are jointed through a spring. The horizontal bailing device for the oil well has the advantages of excellent sealing property; small friction between the bailing pump and the bushing and between the bailing pump and the coupling; long service life; effective prevention of massive sand particles from entering inside the piston barrel; strong sand pumping property of the piston; and high work efficiency.

The present invention relates to a ball valve, its valve rod and left-hand screw thread end of its uspporting shaft are respectively equipped with an upper nut and a lower nut which respectively possess a pair of symmetrical lugs, and two lugs positioned on same side of said upper nut and lower nut are respectively hinge-connected with one end of one link joint, and another end of the link joint is hinge-connected with half-valve core with spherical external surface of said side, and the upper end surface of upper nut possesses a ring groove in which can open-ended spring is fixedly mounted, a positioing pin is inserted into valve cavity, and on the positioning pin a press plate is fixedly mounted. The opening and closing processes of said valve are implemented by means of separation and contact of two semi-spherical valve cores and valve seat seal component, they do not produce friction, so that said ball valve has no leakage and its service life is long as compared with existent ball valve.

The invention relates to a cam pressing type tee ball valve, comprising a tee valve, a valve plug and a rotation driving mechanism for driving valve plug to rotate disposed in the tee valve, and a pressing mechanism disposed on the valve. The pressing mechanism comprises a pressing shaft driven by external and a pressing cam which is fixed on a stretching end of a pressing shaft inserted into the valve. A cam counter bore which is matched with the pressing cam is disposed on the valve plug. During the rotation of valve plug, the valve plug always inclines towards one side of an inlet of the valve and the sealing surfaces of the valve plug and an outlet do not contact with each other so the sliding friction problem of prior art does not exist and the service life of the valve is prolonged.

The invention discloses an exoskeleton finger with a finger tip position following and finger tip bidirectional feedback functions, which relates to a finger of a data glove with bidirectional active drive and force feed back functions. The invention aims to solve the drawbacks that the prior force-feedback data glove can not move without the cooperation of human fingers, can not realize bidirectional active drive, is bloated in structure and low in integration, can not well tell a 'contact' mode from a 'non-contact' mode during force feedback, has a serious friction problem and is inconvenient to control. The output end of a motor driving system of the exoskeleton finger is connected with the input end of an extendable exoskeleton mechanism. The output end of the extendable exoskeleton mechanism is connected with a finger tip force feedback device and a position following device to form a modularized force feedback finger. The exoskeleton finger has the advantages of realizing following positions where the finger of an operator moves and force feedback in a free space or a constrained space according to the operation of a following hand to improve the virtual reality and the sound-surround ambiance of remote control, along with more compact structure, high system bandwidth.

The invention discloses a device and method for testing concrete self-constriction under the condition of temperature changing. The device comprises a magnetic chuck, a non-contact displacement sensor, a bellows mold, a test stand, a quartz glass rod, a bellows packaging end socket, a hanger, a pressure relief air bag, a plastic tube, and a rubber plug. The device employs the specially-produced bellows mold and package end socket as the molding tool for self-constriction deformation testing, and solves a problem that a mode does not cooperate with the deformation of a test piece. The device isprovided with the pressure relief air bag, thereby avoiding the impact caused by the internal air pressure of a bellows to the early testing. The device is provided with the hanger, thereby solving afriction problem of the mold and the test stand, and truly achieving the zero friction between the test piece and the stand. The device is provided with the quartz glass rod, thereby avoiding the impact on testing from the self-deformation of the test support. The device achieves the accurate testing of the self-constriction deformation under the condition of temperature changing, and the testingmethod is stable, scientific and reliable.

The present invention discloses HF inducing motor and its speed controller. Conducting winding is set in motor rotor and stator, and the rotor winding is connected to capacitor to form resonant loop.When HF alternate current is led into the stator winding, current will generate in the rotor by means of electric induction and electromagnetic resonance and interect with stator magnetic field to rotate motor to solve the friction problem of ultrasonic wave motor. The motor of the present invention can detect its rotation speed via stator winding. The low frequency component in winding voltage or current has frequency proportional directly with the rotation speed and is used in controlling and displaying rotation speed. The present invention also provides motor speed controller comprising simple analog and digital circuit.

The invention relates to the petroleum machinery technical field, in particular to a bailing device for a horizontal well and a bailing method using the same. The invention provides the bailing device for the horizontal well and the bailing method using the same to solve the problem of sealing property for a check valve in the prior bailing process and the problem of frictions between a pump body of a bailing pump and a bushing and between the pump body of the bailing pump and a coupling, wherein, a drainage orifice is arranged above a vertical segment of a bailing pump, a piston barrel is arranged under the drainage orifice, a piston rod inside the piston barrel is provided with an upper valve, and the lower end of the piston rod is provided with a hard piston and a soft piston; a sand blocking short circuit is arranged under the piston barrel; the front end of the horizontal segment of the bailing pump is provided with a tool for cutting and pushing sands, while the other end of the tool for cutting and pushing sands is provided with a bottom valve and a sand shovel, a valve core and a valve seat of the bottom valve are jointed through a spring; and a centralizer is arranged on the pump body of the horizontal segment of the bailing pump. The bailing device for the oil well has the advantages of excellent sealing property; small friction between the bailing pump and the bushing and between the bailing pump and the coupling; long service life; effective prevention of massive sand particles from entering inside the piston barrel; strong sand pumping property of the piston; and high work efficiency.

The invention provides a fan tower tube vibration control eddy current tuning mass damper. The mass damper is arranged inside a fan tower tube (1) and comprises a sleeve (2), a base plate (7) arrangedat the bottom of the sleeve (2) and a copper plate (6) and a permanent magnet (4) which are arranged inside the sleeve (2). The permanent magnet (4) is suspended at the top of the sleeve (2). The copper plate (6) is fixed to the base plate (7) and can perform vibration reduction on a fan tower tube, and the damping effect is good. The magnitude of magnetic damping can be flexibly adjusted, and the large adjusting range is obtained. The damper is arranged inside the fan tower tube (1), a connecting plate (8) is fixed to the inner wall of the fan tower tube (1) in a welded mode, and the weatherresistance is good. The rigidity of the damper is changed by changing the diameter and length of a suspender (3), the rigidity of the damper is adjustable flexibly, no mechanical friction problem orsealing problem exists, and the reliability and durability are good.

The present application discloses a rotating shaft assembly and electronic equipment. The rotating shaft assembly comprises a rotating shaft, a first component and a second component, wherein the rotating shaft comprises a first shaft section and a second shaft section, and the shaft diameter of the first shaft section is smaller than that of the second shaft section; the first component is sleeved on the first shaft section, and one end of the first component is abutted against the end surface of the second shaft section; the second component is sleeved on the first shaft section; a repulsivemagnetic force is formed between the first component and the second component to provide resistance when the second component rotates relative to the rotating shaft and then cause the second component to be subjected to the action of the resistance when rotating relative to the rotating shaft, so that the second component can stay at any angle in a relative rotating process relative to the rotating shaft; in addition, because the resistance against the second component when the second component rotates relative to the rotating shaft is provided by the repulsive magnetic force formed between the first component and the second component, the friction problem between the second component and the rotating shaft is also solved, and the service life of the rotating shaft is prolonged.

The invention provides a hydraulic self-sealing plunger oil pump, for thoroughly solving the friction problem between sucker rod and oil pipe, comprising plunger, pump barrel and traveling valve, where central rod sieve tube of the plunger is jacketed with a seal elastomer layer, the seal elastomer is jacketed with rigid metal ring and elastic seal ring. In the up-stroke course of the oil pump, the high pressure in the plunger acts through the seal elastomer onto the wearable elastic seal ring to reduce clearance between the seal ring and the pump barrel, strengthening seal and reducing leakage; in the down-stroke course, the pressures at two ends of the plunger are the same, the wearable seal ring contracts, increasing the clearance and reducing down-going resistance of the plunger. And the seal ring structure of the invention is applied to all hydraulic-plunger or multi-plunger pumps, having advantages of reducing the leakage of pump, raising volume of pump and efficiency of pump, etc.

The invention discloses a freeze dryer and a supporting plate feeding and discharging system thereof. The supporting plate feeding and discharging system of the freeze dryer involves supporting plates, a base and a lifting mechanism used for controlling the supporting plates to ascend and descend, wherein the base is provided with idler wheels capable of travelling on a feeding and discharging machine base, and the lifting mechanism is arranged on the base; when the supporting plates are placed on the lifting mechanism, if the lifting mechanism is in a first working state, the bottoms of the supporting plates are located at first horizontal height, and the first horizontal height is the horizontal height where the machine base upper surface of the feeding and discharging machine base is located; and if the lifting mechanism is in a second working state, the bottoms of the supporting plates are located at second horizontal height, and the second horizontal height is higher than the first horizontal height. The freeze dryer and the supporting plate feeding and discharging system thereof can solve the friction problem in the supporting plate feeding and discharging process of the freeze dryer, avoids the risk caused by friction, is beneficial to reduce the labor intensity of an operator, and can normally feed products with low-temperature feeding requirement.

The invention provides a gate valve (1) for control of petroleum production or water injection, distinctive in that at least one surface subject to sliding in operation of the valve comprises a top layer coating of diamond like carbon (DLC). The DLC contains hydrogen, preferably more than 16 atom-% and more preferred more than 17 atom-%. It is further directed to a method of commissioning or operating a gate valve according to the invention, and use of a diamond like carbon (DLC) top layer coating on at least one surface subject to sliding in operation of the gate valve. Valve parts have a tendency of sticking, adhering or cold welding together, which result in high friction. The aim of the invention is to reduce or eliminate friction problems occurring with time or operation cycles, when using a full scale gate valve.

The invention provides a gate valve (1) for control of petroleum production or water injection, distinctive in that at least one surface subject to sliding in operation of the valve comprises a top layer coating of diamond like carbon (DLC). The DLC contains hydrogen, preferably more than 16 atom-% and more preferred more than 17 atom-%. It is further directed to a method of commissioning or operating a gate valve according to the invention, and use of a diamond like carbon (DLC) top layer coating on at least one surface subject to sliding in operation of the gate valve. Valve parts have a tendency of sticking, adhering or cold welding together, which result in high friction. The aim of the invention is to reduce or eliminate friction problems occurring with time or operation cycles, when using a full scale gate valve.

The invention discloses a belt type printing device which comprises a prismatic pair module, a rolling unit, a ribbon cassette and a printing head, wherein the prismatic pair module comprises a bracket, a guide rail, a sliding block and a printing support; the bracket is fixedly connected with the guide rail; the sliding block is meshed with a sliding block groove; the other surface of the sliding block is fixedly connected with the printing support; the other surface of the printing support is fixedly connected with the ribbon cassette; the printing head is fixedly connected below the printing support; the rolling unit is mounted on the printing support through a bearing seat, and comprises a driving friction wheel, a friction wheel, a shaft, a ribbon rotating shaft, a belt pulley I, a synchronous belt, a swinging arm and a belt pulley II; the two ends of the swinging arm in the rolling unit are respectively hinged to the belt pulley I and the belt pulley II; the belt pulley I is fixedly connected with the ribbon rotating shaft; and the belt pulley II is fixedly connected with the friction wheel. Compared with the prior art, the belt type printing device can solve the problems that during detaching, a printing medium rubs against a ribbon, and the printing medium is wasted due to the influence of a structure space.

The invention relates to the petroleum machinery technical field, in particular to a horizontal bailing device for an oil well and a bailing method using the same. The invention provides the horizontal bailing device for the oil well and the bailing method using the same to solve the problems of sealing property for a check valve in the prior bailing process, frictions between a pump body of a bailing pump and a bushing and between the pump body of the bailing pump and a coupling, and cleaning residual sands attached on the inner wall of the bushing, wherein, a piston rod, a drainage hole, an upper valve, a piston barrel, a hard piston, a soft piston, a desilting pipe and a tool for cutting and pushing sands are arranged in sequence from a turning position of the bailing pump to the other end of a horizontal segment inside the pump body; a sand blocking short circuit is arranged between the piston barrel and the desilting pipe, and a centralizing instrument is arranged on the pump body of the horizontal segment; and the tail end of the horizontal segment of the bailing pump is provided with a bottom valve and a sand shovel. The horizontal bailing device for the oil well has the advantages of excellent sealing property; small friction between the bailing pump and the bushing and between the bailing pump and the coupling; long service life; effective prevention of massive sand particles from entering inside the piston barrel; strong sand pumping property of the piston; and high work efficiency.

The present invention discloses an adjustable garlic bulb separation device for agricultural planting. The adjustable garlic bulb separation device comprises an operation room; a material storage hopper is vertically arranged on the top part of the operation room; a sliding baffle plate is arranged on the material storage hopper in a horizontal sliding manner; a material feeding hole is formed inthe sliding baffle plate; a positioning rod is arranged in the sliding baffle plate in a vertical sliding manner; the upper end of the positioning rod is horizontally fixedly provided with a fixing plate; and a reset spring is in a movable sleeve on the positioning rod. Rotations of a first friction plate and a second friction plate realize rotation and rubbing of garlic bulbs and promote the separation and bulb separation of the garlic bulbs; rotation rotary wheels can drive screw rods to rotate to realize the adjustment of the spacing between the first friction plate and the second frictionplate; the adjustment is conducted according to the sizes of the garlic bulbs; the adjustable garlic bulb separation device is simple and convenient to use, and high in efficiency of garlic bulb separation; the sliding baffle plate can slide left and right to realize the adjustment of the material feeding speed of the garlic bulbs, is convenient to adjust, and effectively avoids a problem that theseparation degree of the garlic bulbs is affected by the excessive concentration of the falling of the garlic bulbs; and the adjustable garlic bulb separation device is easy to use and high in adjustable property.

The invention relates to a high-reliability closed spool type dynamic pressure bearing. The high-reliability closed spool type dynamic pressure bearing comprises a spindle, a bearing rotor installed on the spindle in a sleeving mode, a spindle sleeve located between the spindle and the bearing rotor and thrust plates installed at the two ends of the spindle in a sleeving mode respectively. According to the dynamic pressure bearing, the spindle sleeve is additionally arranged on the spool bearing structure, the spindle sleeve is fixed to the spindle and forms a closed spool type structure withthe bearing rotor, the thrust plates each adopt a special slope structure, external air flow is pumped into an axial bearing body and a radial bearing body through the thrust plates with the special slopes, pressure distribution is formed in a bearing working clearance, the pressure in the bearing maintains the dynamic stability after the rotation speed is stable, and the bearing rigidity problemand the axial bearing body starting and stopping friction problem are solved; an axial compressing nut adopts an elastic compressing structure, and therefore it is guaranteed that the bearing axial clearance keeps stable at different temperatures; and a radial bearing friction pair adopts a boron carbide-boron carbide mode, a thrust axial friction pair adopts a boron carbide-structural steel mode,and therefore the bearing contact friction and wear problems are further solved.

A vertical shaft maglev wind power generator is composed of vanes, a rotary shaft, a power generator, a radial magnetic bearing, an axial TDOF magnetic bearing, an upper protection bearing, a lower protection bearing, an upper protection bearing retainer ring and a lower protection bearing retainer ring; the rotational part and the stationary part of the fan are not in mechanical contact, the mechanical friction in the fan is completely eliminated and the FDOF levitation of the fan rotor is realized. The axial magnetic bearing of the fan supplies gravity offset through 4 stator magnetic polesand the effect of a suction disc and performs axial translation and two radial rotational DOF control on the rotor; and the radial magnetic bearing finishes the two radial translation control of the fan rotor. The invention has reasonable layout of the components, completely eliminates the friction problem of the vertical shaft fan bearing, greatly reduces the starting wind speed of the wind power generator and improves the wind energy utilization rate.

The invention provides a nanofluid magnetic wheel power generator and a manufacture method thereof. The nanofluid magnetic wheel power generator comprises a wheel tyre and a conductive brush fixed on one side of the wheel tyre, wherein a rotor coil is fixed in the wheel tyre, a fluid magnet is injected in the wheel tyre, and two output terminals of the rotor coil are connected with the conductive brush. The manufacture method of the nanofluid magnetic wheel power generator comprises the steps of: 1, manufacturing the rotor coil; 2, fixing the rotor coil in the wheel tyre, connecting the two output terminals of the rotor coil with the conductive brush; and 3, injecting the fluid magnet in the wheel tyre provided with the rotor coil. The nanofluid magnetic wheel power generator is low in manufacturing cost, simple in manufacture process and free of maintenance. Because a nano tube carbon fiber material and the fluid magnet are adopted, according to the present manufacture cost calculation, the cost of each wheel power generator is not more than 800 RMB. The nanofluid magnetic wheel power generator can be additionally arranged in the existing wheel tyre, and can be directly arranged when the wheel tyre is manufactured. Due to the adoption of the flexible material, no mechanical friction problems exist and no failure is basically caused.

The invention discloses a railway vehicle bogie and an integrated adapter rubber blanket thereof. The integrated adapter rubber blanket comprises an upper liner plate and a rubber layer vulcanized on the lower surface of the upper liner plate and is characterized by comprising an adapter, the rubber layer is located between the upper liner plate and the adapter, and the adapter and the rubber layer are molded into an integrated structure through a vulcanization technology. Due to the fact that the rubber layer and the adapter are directly molded into the integrated structure through the vulcanization, connection between a lower liner plate and the adapter is not needed; due to the fact that the lower metallic liner plate is omitted, the transverse rigidity of the whole rubber blanket can be greatly lowered, the overall curve negotiating performance of the rubber blanket and the adapter is improved, and the friction problem between the lower liner plate and an adapter in the prior art is solved.

The invention relates to an automobile brake clearance manual and automatic adjusting arm. The automobile brake clearance manual and automatic adjusting arm comprises a control plate, and the controlplate and a large tooth ring are fixedly connected into a whole; the large tooth ring is in engagement fit with a small gear, and an inner hole of the small gear is of a sector structure; one end of asmall shaft is of a flat square structure; the sector structure of the small gear is connected with the flat square structure of the end of the small shaft; a reset spring is arranged in the gap where the end of the small shaft is matched with the sector structure of the small gear; a one-way bearing sleeves the outer side of the small shaft, and the one-way bearing and a first helical gear are in interference fit and connected into a whole; the first helical gear is in engagement fit with a second helical gear, and the second helical gear sleeves one end of a worm shaft; and the worm shaft is inserted into an inner hole of a worm, the worm is in engagement fit with a worm gear, and an inner hole of the worm gear is connected with a cam shaft of a brake. The automobile brake clearance manual and automatic adjusting arm provided by the invention is reliable and low in cost, the drawing friction problem of a brake is solved, the automobile braking efficiency is improved, and the automobile running safety is improved.

The invention relates to an automobile brake clearance manual and automatic adjusting arm. The automobile brake clearance manual and automatic adjusting arm comprises a control plate, and the controlplate and a large tooth ring are fixedly connected into a whole; the large tooth ring is in engagement fit with a small gear, and an inner hole of the small gear is of a sector structure; one end of asmall shaft is of a flat square structure; the sector structure of the small gear is connected with the flat square structure of the end of the small shaft; a reset spring is arranged in the gap where the end of the small shaft is matched with the sector structure of the small gear; a one-way bearing sleeves the outer side of the small shaft, and the one-way bearing and a first helical gear are in interference fit and connected into a whole; the first helical gear is in engagement fit with a second helical gear, and the second helical gear sleeves one end of a worm shaft; and the worm shaft is inserted into an inner hole of a worm, the worm is in engagement fit with a worm gear, and an inner hole of the worm gear is connected with a cam shaft of a brake. The automobile brake clearance manual and automatic adjusting arm provided by the invention is reliable and low in cost, the drawing friction problem of a brake is solved, the automobile braking efficiency is improved, and the automobile running safety is improved.

The invention relates to the petroleum machinery technical field, in particular to a bailing device for an oil well and a bailing method using the same. The invention provides the bailing device for the oil well and the bailing method using the same to solve the problems of sealing property for a check valve in the prior bailing process and frictions between a pump body of a bailing pump and a bushing and between the pump body of the bailing pump and a coupling, wherein, a drainage orifice is arranged above a vertical segment of a bailing pump, and a piston rod is arranged under the drainage orifice and is provided with an upper valve; a piston barrel, a sand blocking short circuit and a tool for cutting and pushing sands are arranged in sequence from a syphon to the other end on the horizontal segment of the bailing pump, wherein, a hard piston and a soft piston are arranged behind the piston barrel, a centralizer is arranged on the pump body of the horizontal segment, the other end of the tool for cutting and pushing sands is provided with a bottom valve and a sand shovel, and a valve core and a valve seat of the bottom valve are jointed through a spring. The bailing device for the oil well has the advantages of excellent sealing property; small friction between the bailing pump and the bushing and between the bailing pump and the coupling; long service life; effective prevention of massive sand particles from entering inside the piston barrel; strong sand pumping property of the piston; and high work efficiency.

The present invention relates to a robot joint device. According to the present invention, a link (200) connects between first and second plates (110, 120) positioned in parallel with each other. A plurality of links (200) are configured and installed such that a plurality of first end portions and a plurality of second end portions thereof are connected to the first and second plates (110, 120),respectively, and connecting points of the first end portions and connecting points of the second end portions constitute polygons, respectively. Both end portions of each link (200) are connected tothe first and second plates (110, 120) by connecting members (300) such that angle and rotation adjustments are possible with regard to the first and second plates (110, 120), respectively. Both endsof a rotating shaft (400) penetrate the first and second plates (110, 120), respectively, and are rotatably installed therein. A gear reduction portion (500) is installed inside the first plate (110)and is connected to the first end of the rotating shaft (400). A pulley (700) is connected to the second end of the rotating shaft (400) so as to transfer driving power to the rotating shaft (400). The pulley (700) receives driving power from a driving portion. The present invention, which has the above-mentioned configuration, is advantageous in that the movement of a human wrist or the like canbe implemented realistically, and precise control is enabled by absence of any problem caused by backlash and friction resulting from conventional gear teeth, thereby improving the durability of the product.