160results about How to "Increase rotational resistance" patented technology

A longitudinal minimal-invasion bone cutter for tubular bones comprises a bone cutting end bone cutting device and far end positioning devices. The bone cutting end bone cutting device is slidingly sleeved on a positioning adjusting guide rail which is in a long-strip shape, a sliding groove is arranged in the middle of the positioning adjusting guide rail along the length direction, and scales of the positioning adjusting guide rail are arranged along the sliding groove. The far end positioning devices are symmetrically sleeved at two ends of the positioning adjusting guide rail slidingly. By means of the longitudinal minimal-invasion bone cutter, medical workers can perform longitudinal bone cutting operations on the tubular bones according to treatment needs, and the longitudinal minimal-invasion bone cutter is convenient to operate. When the operations are performed, the longitudinal minimal-invasion bone cutter provides convenience for transverse traction of bone blocks and meets needs of angiitis treatment. The bone cutting operations performed by the aid of the longitudinal minimal-invasion bone cutter belong to minimal-invasion operations, do not damage nerves, blood vessels, soft tissues and periostea, have small invasion, facilitate reconstruction and union of bones, and meet needs of longitudinal traction treatment of the tubular bones. By means of the longitudinal minimal-invasion bone cutter, safety and accuracy of the longitudinal bone cutting operations of the tubular bones are improved, medical workers can conveniently perform the operations, and the operation effect is guaranteed.

The invention discloses a perpendicular rope climbing patrolling robot in ultra-deep vertical shaft steel-rope guide. The perpendicular rope climbing patrolling robot comprises an explosion-proof shell, a driving mechanism, a wheel mechanism, a clamping mechanism, a carrying mechanism and an electric control device. The explosion-proof shell comprises an upper driving shell body, a lower driving shell body, a driver shell body, an electric control device shell body and a carrying mechanism shell body. The driving mechanism comprises an upper driving part, a lower driving part and a motor driver. The wheel mechanism comprises an upper driving wheel part, an upper left side driven wheel part, an upper right side driven wheel part, a lower driving wheel part, a lower left side driven wheel part and a lower right side driven wheel part. The clamping mechanism comprises a left side clamping part and a right side clamping part. The carrying mechanism comprises a movable trolley, an intrinsic safety camera and a cloud deck. The rope climbing patrolling robot can meet the explosion-proof requirement of a coal mine, can climb on the ultra-deep vertical shaft steel-rope guide and can monitor the strain of the shaft wall and the derrick structure situation.

A longitudinal minimal-invasion bone cutter for tubular bones comprises a bone cutting end bone cutting device and far end positioning devices. The bone cutting end bone cutting device is slidingly sleeved on a positioning adjusting guide rail which is in a long-strip shape, a sliding groove is arranged in the middle of the positioning adjusting guide rail along the length direction, and scales of the positioning adjusting guide rail are arranged along the sliding groove. The far end positioning devices are symmetrically sleeved at two ends of the positioning adjusting guide rail slidingly. By means of the longitudinal minimal-invasion bone cutter, medical workers can perform longitudinal bone cutting operations on the tubular bones according to treatment needs, and the longitudinal minimal-invasion bone cutter is convenient to operate. When the operations are performed, the longitudinal minimal-invasion bone cutter provides convenience for transverse traction of bone blocks and meets needs of angiitis treatment. The bone cutting operations performed by the aid of the longitudinal minimal-invasion bone cutter belong to minimal-invasion operations, do not damage nerves, blood vessels, soft tissues and periostea, have small invasion, facilitate reconstruction and union of bones, and meet needs of longitudinal traction treatment of the tubular bones. By means of the longitudinal minimal-invasion bone cutter, safety and accuracy of the longitudinal bone cutting operations of the tubular bones are improved, medical workers can conveniently perform the operations, and the operation effect is guaranteed.

The invention relates to a centrifugal disc for producing glass wool. The centrifugal disc is characterized in that a curved slot for guiding the flowing direction of glass metal is formed in the bottom surface of the centrifugal disc, and the curve is in the shape of an Archimedean spiral; a main shaft installing hole in the bottom surface of the centrifugal disc is used as the starting end of the curved slot, a lower terminated line of a hole in the inner wall of the centrifugal disc is used as the ending end of the curved slot, and the curved slot is arranged in the same direction as the rotating direction of the centrifugal disc. The curved slot in the shape of the Archimedean spiral is formed in the bottom of the centrifugal disc, and is arranged in the same direction as the rotating direction of the centrifugal disc, therefore, the centrifugal disc has the characteristic of guiding the glass metal to adhere on the lateral wall of the centrifugal disc continuously and evenly so as to prevent the glass metal from generating turbulence in a centrifugal process; the centrifugal fiber-forming effect of the glass wool is significantly improved. The centrifugal disc can be widely applied to the field of preparing the glass wool in different levels, and can provide references for other fields of preparing materials in a centrifugal method.

A golf ball with aerodynamic coefficient magnitude and aerodynamic force angle, resulting in improved flight performance, such as increased carry and flight consistency regardless of ball orientation. In particular, the present invention is directed to a golf ball having increased flight distance as defined by a set of aerodynamic requirements, at particular spin ratios and Reynolds Numbers. The invention is also directed toward golf balls having high spin decay rates during the first second of flight that yields improved flight performance and longer ball flight

The invention provides a feeding device of a metal wire material for engaged elements in a zipper teeth chain continuous making machine, which can feed the metal wire material for the engaged elements to a forming implanting part of the engaged elements in the zipper teeth chain continuous making machine. The feeding device of the metal wire material for the engaged elements comprises a wire material feeding roller (11), a transmitting shaft (13), a ratchet wheel (14) and a pawl (15), wherein the wire material feeding roller (11) is used for feeding the metal wire material (W) for the engaged elements to the forming implanting part (1) of the engaged elements; the transmitting shaft (13) is connected with the wire material feeding roller (11); the ratchet wheel (14) is fixed on the transmitting shaft (13); and the pawl (15) reciprocates by the rotation of a main shaft (30). The ratchet wheel (14) intermittently rotates towards a feeding direction by the reciprocated movement of the pawl (15), and a brake mechanism (50) is arranged for increasing the rotation resistance of the ratchet wheel (14), so that the ratchet wheel (14) can stably and reliably rotate with a ruled rotation angle.

The invention discloses a method and device for treating and maintaining a black and odorous water body by inoculating with activated sludge, and belongs to the technical field of water environment control. According to the method and device for treating and maintaining the black and odorous water body by inoculating with the activated sludge, the black and odorous water body is treated synchronously by ''inoculating with the activated sludge and planting floating plants'', the amount of active microorganisms with degradability in the water body is increased, the removal effect of organic pollutants in the water body is improved and the nutrient pollution ammonia nitrogen concentration is reduced; and the device for treating and maintaining the black and odorous water body is a workboat which integrates the functions of activated sludge addition, sediment collection, ventilation and oxygenation, mixing of sludge and water, floating plant collection and transmission, compression and dehydration and the like, conducts in-situ control and remediation without destructive work on the water ecology, and has broad application prospects in the field of black and odorous water body control.

The invention provides a rotary-type translation piston compressor, and belongs to the technical field of mechanical engineering, in order to solve the problem that an existing rotary-type compressor is high in elastic stiffness of a spring. The rotary-type translation piston compressor comprises an air cylinder with a piston cavity and a crankshaft with an eccentric part positioned in the piston cavity; an air cylinder blade groove is provided with a blade; a piston is sleeved on the eccentric part; the outer side surface of the eccentric part and the inner side surface of the piston are connected through a rolling bearing component; a bar-shaped concave circular arc groove which is parallel to a piston bus is formed on the outer circumference surface of the piston; the top surface of the blade is a convex circular arc curve surface; the circular arc top of the blade is embedded into the concave circular arc groove of the piston, and the top surface of the blade and the concave circular arc groove surface butt against mutually under the effect of spring force. The rotary-type translation piston compressor is applied to 1-1.5HP air conditioners, and the elastic stiffness of the spring is only required to be controlled to 2-4Kg / mm, or even lower.

The invention relates to an elliptical trainer. The elliptical trainer comprises a rack provided with a first end and a second end, a rocking bar mechanism hinged to the first end of the rack, a pedal mechanism hinged to the second end of the rack through a transmission mechanism, an adjusting mechanism comprising an adjusting table, and a connecting rod with two ends connected with the rocking bar mechanism and the pedal mechanism respectively to make the rocking bar mechanism in linkage with the pedal mechanism, wherein one end of the adjusting table is in rotary connection with the rack, the pedal mechanism is in sliding connection with the adjusting table, and the adjusting mechanism adjusts the position of the pedal mechanism with respect to the rack. Due to the fact that the elliptical trainer is provided with the adjusting mechanism in rotary connection with the rack and the pedal mechanism is in sliding connection with the adjusting mechanism, the exercise experience of climbing simulated through the pedal mechanism of a user is increased by changing a rise angle of the adjusting mechanism with respect to the rack. Due to the fact that a resistance adjusting mechanism is arranged on a flywheel, rotating resistances of the flywheel and a turntable are increased, and multiple exercise experiences are provided for the user.

The invention discloses a continuous conveying double-face air drying device for eel roasting. The continuous conveying double-face air drying device comprises a conveying device, an air blowing device, an air drying bin and a filtering device; the conveying device is used for feeding eels needing to be subjected to air drying into the air dying bin, and hot air blown out from the air blowing device conducts air drying treatment on the eels in the air drying bin after being filtered by the filtering device; the air drying bin comprises an air purifying and filtering bin and an air drying mainbin; the filtering device is arranged in the air purifying and filtering bin and comprises a feeding roller, a filter felt and a winding roller; and the air drying main bin is internally provided witha gear ring, a planet gear, a center shaft and a connection rod, the planet gear is provided with a protrusion, and the protrusion can rotate into guide grooves of a four-corner rotation piece and drive the four-corner rotation piece to do angular motion. The invention further discloses an eel air drying method. The continuous conveying double-face air drying device for eel roasting and the eel air drying method have the advantages that feeding is conducted, the air drying continuity is high, automatic turning over can be achieved, and the air drying cleanliness is high.

An idle speed control apparatus for an internal combustion engine of a vehicle to adjust an engine speed to a target engine speed set in accordance with a magnitude of a drive request value for an auxiliary driven by the engine when a speed of the vehicle is below a predetermined speed to idle the engine, that reduces the drive request value for the auxiliary when executing the idle speed control, and that reduces the target engine speed by a value equivalent to a reduction in the drive request value after lapse of a prescribed delay time from a time point corresponding to start of reduction of the drive request value, the control apparatus comprising engine speed reduction means for reducing the target engine speed before lapse of the delay time if the vehicle is traveling on a road surface with low friction coefficient.

The invention relates to the technical field of inductor production, and provides a full-automatic production line and process of an inductor. The full-automatic production line comprises an assemblymechanism, a transfer mechanism, a film winding mechanism and a tin dipping output mechanism, wherein the assembly mechanism comprises a rack, a sequence assembly A, a sequence assembly B, a sequenceassembly C and a jacked-up assembly, an assembly region is formed on the jacked-up assembly, the transfer mechanism comprises a positioning assembly, a telescopic assembly and a translation assembly,the film winding mechanism comprises a bearing rack, a placement assembly, a transmission assembly, a pre-tightening assembly and a cutter, the pre-tightening assembly and the positioning assembly arearranged in an interrupt contact way, and the tin dipping output mechanism comprises a tin liquid bin, a guide assembly and a receiving bin. An assembly body is driven to be interrupt transmission with the film winding mechanism by the transfer mechanism during the transferring process, a thin film is wound around the assembly body in an automatic rotation mode, automatic film winding of the assembly body during the transferring process is achieved, and the technical problem of low production efficiency caused by independence of each process in the prior art is solved.

The invention provides a temperature controller assembly and a refrigerator. The temperature controller assembly comprises a panel, a knob assembly and a temperature controller body. A mounting groove is formed in the panel. The knob assembly comprises a fixed base, a knob body and a rotor assembly, the fixed base is fixed in the mounting groove, and the knob body comprises a torsion cap and a torsion bar. The top end of the fixed base is further provided with a groove, and the rotor assembly is located in the groove, and comprises a rotor body and an elastic clutch portion. Clamping grooves are formed in the outer side wall of the rotor body, the fixed end of the elastic clutch portion is connected with the inner wall of the groove, and the free end of the elastic clutch portion is in butt joint with the clamping grooves. The temperature controller body is connected with the panel, and a rotary shaft of the temperature controller body is connected with the torsion bar. According to the technical scheme, rotating resistance generated when the temperature controller body is adjusted is increased, and the problem that the hand feeling is poor in the rotating adjusting process is effectively solved; and the adjusting experience of a user is improved, the situation that a rotor accidentally rotates under the influence of little external force can be avoided, and the reliability of knob adjustment is effectively guaranteed.

The invention discloses an automobile accessory electrophoresis coating suspension frame. The frame comprises a suspension frame main rod, a sleeve fixing knob, a main rod fixing knob, a bearing cover, a bearing body and a friction plate, a sliding sleeve is arranged outside the suspension frame main rod, and a hook is installed on the outer side of the suspension arm; a mounting nut is arranged on the inner side of the hook, and a suspension frame main rod is connected outside the main rod fixing knob; a secondary hook is arranged below the sliding rail, supporting rods are arranged on the left side and the right side of the base; and a bearing cover is connected outside the bearing body. The connecting mode of the suspension arm of the automobile accessory electrophoretic coating suspension frame and the suspension frame main rod and the connection mode of the secondary hook and the suspension arm are both in sliding connection, and the distance between the suspension arm and the secondary hook can be adjusted; and the use is more flexible, the application range is wider, the hook and the suspension arm are of a detachable structure through the installation nut, so that the hookcan be detached from the suspension arm, the frame is convenient to replace or maintain, and the use is more convenient.

The invention discloses electronic equipment and a control method thereof. The control method is applied to the electronic equipment. The electronic equipment comprises a first body, a second body and a rotating shaft. A touch display unit is arranged on the second body. The rotating shaft is used for connecting the first body with the second body. Through the rotating shaft, the second body can rotate relative to the first body. The method includes judging whether or not the electronic equipment is under a preset condition to acquire a judging result; when the judging result indicates that the electronic equipment is under the preset condition, increasing the rotation resistance borne by the rotating shaft during rotation so as to enable the second body to be in a non-rotating state relative to the first body when a user touches the touch display unit.

The invention provides a reciprocating cutting tool, which is used for cutting workpieces and comprises a handle, a casing, a motor, a reciprocating lever and a limiting part, wherein the casing is pivotally connected with the handle, the motor is contained in the casing, the reciprocating lever is driven to reciprocate by the motor, and the limiting part is arranged on the casing. A locking part is detachably mounted on the handle, can be matched with the limiting part and is operably placed at a locking position and a releasing position, wherein the locking position is used for limiting relative rotation of the casing and the handle, the releasing position is used for allowing relative rotation of the casing and the handle, and the locking part at least partially encloses the limiting part. The reciprocating cutting tool has the advantages that the rotary resistance between the locking part and the limiting part is increased, and the positions of the locking part and the limiting part are stably locked.

The invention relates to a bridge construction device, specifically to a bi-directional traction vertical rotation construction device for a cable-stayed bridge steel arch tower. The bi-directional traction vertical rotation construction device for the cable-stayed bridge steel arch tower comprises a vertical rotation hinge, a skid-resistant support base, a steel arch tower assembly moulding bed, a vertical rotation frame assembly moulding bed, a vertical rotation frame, a vertical rotation frame hinge base, a front pull cable, a rear pull cable, a balance cable, and a stable cable; the skid-resistant support base is located on the bottom of a steel box girder; the steel arch tower assembly moulding bed is consist of multiple lattice steel columns; the vertical rotation frame assembly moulding bed is installed on the steel box girder; one end of the front pull cable is installed on the front pull cable anchoring point of the steel arch tower, and the other end of the front pull cable is hinged with the ear plate of the front end of the vertical rotation frame; one end of the rear pull cable is installed on the ear plate of the rear end of the vertical rotation frame, and the other end of the rear pull cable is hinged with the rear pull cable anchoring point of the steel box girder; and one end of the balance cable is hinged with the balance cable anchoring point of the steel arch tower, and the other end of the balance cable is hinged with the balance cable anchoring point of the steel box girder. The device is capable of achieving the goal of safely constructing, improving the project quality, shortening the construction period, and saving the construction cost.

The invention discloses an adjustable space walker and relates to the technical field of sports equipment; the adjustable space walker comprises two vertical bars; the top end of each vertical bar is provided with a first mounting cavity, one end of a first rotary bar is rotationally connected to the sidewall of the first mounting cavity, the other end of the first rotary bar is passed through the first mounting cavity and connected with a moving bar, the bottom end of a connection bar is provided with a footboard, a first gear fixedly sleeves the first rotary bar and is positioned in the first mounting cavity, a second cavity is arranged below the first mounting cavity, the first gear is passed through the second mounting cavity and meshed with a second gear, the second gear fixedly sleeves a second rotary bar, two ends of the second rotary bar are rotationally connected to two cavity walls of the second mounting cavity, the second mounting cavity is provided with a water injection hole and a water outlet, and each of the water injection hole and the water outlet is provided with a plug; one side of each vertical bar is provided with the corresponding connection bar, and a handlebar is connected to the heads of the two connection bars. The adjustable spacer walker allows exercise intensity to be adjusted through resistance of water.

The invention discloses a controllable opening structure for a bottom cover of a dust collection barrel, which comprises a bottom cover linkage arranged between a handle and a bottom cover and controlled by an operating rod. The bottom cover linkage comprises an L-shaped connecting rod, the bottom end of the operating rod is connected with the top end of the L-shaped connecting rod rigidly, and the rigid joint and a hinge shaft fixed with the handle of the dust collection barrel form a fulcrum. The operating rod is a swing rod moving around the fulcrum, a first vertical rod is hinged to a middle inflection point of the L-shaped connecting rod, a toothed cam is arranged at the other end of the L-shaped connecting rod and meshes with a gear, and the gear is arranged at the top end of the second vertical rod. The bottom end of the first vertical rod is inserted into the clamp block arranged at the edge of the bottom cover, a tension spring is arranged between one end of a clamping slot and a second vertical rod, a lock rod is fixedly connected to the other end of the clamping slot, and the other end of the lock rod is jointed to the edge of the bottom cover of the dust collection barrel through a fastener structure. After the controllable opening structure is applied to the dust collection barrel, a user can open the bottom cover of the dust collection barrel by a single hand. Further, opening degree of the bottom cover can be controllable, and dust flying can be avoided.

The invention provides a vehicle and a control method. When an engine (12) is started in a motor running mode, a control unit performs engine starting control by raising the engine speed through slip engagement of an engine coupling / decoupling clutch (KO), temporarily reducing engaging force of the engine coupling / decoupling clutch after the engine (12) becomes able to rotate by itself, and then fully engaging the engine coupling / decoupling clutch (KO). The control unit advances the intake valve opening / closing timing at an earlier point in time as the motor speed is higher.

The invention discloses an optimized structure for reducing rotation resistance of a roller of rubber recovery conveying equipment. The optimized structure for reducing the rotation resistance of the roller of the rubber recovery conveying equipment comprises a base, the side wall of the base is fixedly connected with a motor, the output end of the motor is fixedly connected with a rotating shaft, the rotating shaft penetrates through the inner wall of the base and then is fixedly connected with a main gear, a plurality of rotating rods are rotatably connected to the inner side wall of the base in the horizontal direction, a roller and an auxiliary gear are fixedly connected to the side wall of each rotating rod, two round rods are rotatably connected to the inner side wall of the base, a matched gear is fixed to the side wall of each round rod, a chain is jointly connected to the main gear, the auxiliary gears and the matched gears, and a lubricating mechanism is arranged in the base. Lubricating oil is extruded into a communicating pipe to be sprayed out, lubricating oil liquid adheres to a brush, then when the main gear, the auxiliary gears and the matched gears drive the chain to move, brush bristles smear the lubricating oil to the chain, the friction resistance of the chain and the gears is reduced, and therefore the rotating resistance of the rollers is reduced.

The invention discloses a revolution machine as well as a deceleration method and a deceleration device thereof. A main shaft of the revolution machine is fixedly or integrally connected with a deceleration shaft; the deceleration shaft is fixedly provided with a stirring paddle which is suspended at the periphery of the deceleration shaft and is positioned in a container; the container is provided with an opening through which a deceleration liquid can be gradually injected during a deceleration stage of the main shaft; during initial stage of deceleration, since a liquid level is relatively low, the deceleration liquid generates less resistance to the stirring paddle, the main shaft does not decelerate abruptly under driving of the deceleration shaft; along with rising of liquid level of the deceleration liquid, the deceleration liquid stirring depth of the stirring paddle is also gradually increased, i.e., the length, inserted into the deceleration liquid, of the suspended end of the stirring paddle is also gradually increased, so that the resistance to the deceleration shaft is also synchronously increased; the rotation speed of the main shaft driven by the deceleration shaft is slowly reduced, but the resistance generated to the deceleration shaft by the deceleration liquid is gradually increased, thereby ensuring that a nut used for fixing a grinding wheel on the fixed main shaft does not loosen, and ensuring the safety of the grinding wheel and the revolution machine.

The invention discloses a rotary wave absorbing device and a wave absorbing method. The device comprises an anchor block sinking into the sea and a floating body floating in the sea. The floating bodyis fixedly connected to a sliding part which sleeves a fixed rod and can slide up and down along the fixed rod through a rigid rod; a cylindrical wave absorbing rotor is arranged between the floatingbody and the anchor block; two through holes are symmetrically formed in the center of the cylindrical wave absorbing rotor; a rope is threaded in each through hole; one end of the two ropes which are twisted together is fixedly connected to the anchor block while the other end is fixedly connected to the floating body; more than two rigid round bars are arranged in an equally spaced manner circumferentially on the side face of the cylindrical wave absorbing rotor; and a wave breaking ball body is mounted at the tail end of each rigid round bar. The rotary wave absorbing device disclosed by the invention is simple in structure, does not consume energy resources in operation, is good in economical benefit, high in efficiency and free of secondary pollution, and is significant for protecting marine buildings by cutting down waves by means of wave energy.

The invention belongs to the field of oil production equipment in oil fields, and in particular relates to a multi-well coordinated frequency conversion control pumping unit system, which includes a driving device, an oil extraction rope, an oil pump, a derrick and a frequency conversion control cabinet. The driving device includes a motor, a speed reduction mechanism and a reel. The motor drives the reel to rotate through the reduction mechanism. One end of the oil extraction rope is wound on the reel, and the other end goes around the fixed pulley on the top of the derrick and connects with the plunger of the downhole oil well pump. Correspondingly, both the derrick and the oil well pump are Each has two sets, and there is no protrusion on the ground between the two derricks, and the driving device is arranged in a square pit under the ground. The driving device is arranged below the ground, which can make full use of the space between two oil wells, reduce the area of ​​the well site, and thereby reduce the damage to the surface vegetation. At the same time, encapsulating the driving device can effectively reduce the erosion damage to bearings and rubber parts caused by dust and sunlight, thereby extending the maintenance cycle and reducing maintenance costs.

The invention discloses an insulating layer coating device for wires and cables. The insulating layer coating device comprises a bottom plate, and vertical plates are welded to the positions, close tothe two sides, of the outer wall of the top of the bottom plate. The outer wall of one side of each vertical plate is connected with a motor through a bolt; a rotating shaft is arranged at one end ofan output shaft of the motor, and a winding roller is arranged on the outer wall of the rotating shaft; and a mounting hole is formed in the outer wall of one side of each vertical plate, a rotatingrod is rotatably connected to the inner wall of the mounting hole through a bearing, a pay-off roller is arranged on the outer wall of the rotating rod, a connecting rod is welded to the outer wall ofone side of the vertical plate, an electric sliding rail is connected to the outer wall of one end of the connecting rod through a bolt, and a sliding block is slidably connected to the inner wall. According to the invention, the insulating cloth on the coating roller can be uniformly wound on the cable, and the sliding plate can be directly taken down from the sliding block, so that the insulating cloth on the coating roller can be conveniently and quickly fed, the use effect is better, and the cable led out by the pay-off roller can be kept tight, and the coating effect is better.

The invention discloses a cable service life detection machine, which comprises a rack, a driving piece, a resistance piece and two winding reels, and is characterized in that the two winding reels are rotatably arranged on the rack, the two winding reels are arranged in parallel, and the axes of the two winding reels are parallel to each other; the driving piece is arranged on the rack and used for driving one of the winding reels to rotate; the resistance piece is arranged on the rack and used for increasing the rotating resistance of the other winding reel. The detection machine is simple in structure, reasonable in layout, simple and convenient to operate, and capable of effectively detecting the service life of the cable.

The present invention relates to a headrest which can eliminate the shake to eliminate the uncomfortable feeling, and at the same time, the headrest not only can be changed to the use position and the retracted position, but also can be changed with the front-and-after angle at the use position to make the heat more comfortable. The headrest comprises the following components: a rotation restraint bracket which is formed with a contact part and a projecting step part; a stationary shaft which is reversely provided on the rotation restraint bracket; and a fastening board which has one end hinged on the substrate forming the base material of the headrest and is extended or compressed by a spring between the fastening board and the substrate. The headrest not only can reach two positions of a front limit position and a rear limit position in using, but also is provided with an operating handle on the substrate. Through the operation of the handle, the headrest can rotate frontwards to the retracted position when the fastening surface leaves a projected step part.

An electronic information communication equipment heat dissipation box capable of being electrically controlled comprises a cabinet body, cabinet doors are installed at openings in the two sides of the cabinet body in a matched mode respectively, a certain gap needs to be reserved during installation of the cabinet doors so that gas can be exhausted conveniently, a closed box body is arranged in the cabinet body, and the front side and the rear side of the box body are fixedly connected with the corresponding inner walls of the cabinet body respectively, wherein one air inlet pipe is communicated with the inner cavity of the rear side barrel body and the inner cavity of the upper side air bag, the other air inlet pipe is communicated with the inner cavity of the front side barrel body and the inner cavity of the lower side air bag, and one-way valves are also arranged on the air inlet pipes. According to the invention, a method of blowing air from inside to outside for cooling is adopted to effectively solve the problem that communication equipment such as a terminal interface is difficult to cool due to the fact that cables are fully inserted outside, the design of the filter screen plate is adopted to effectively prevent external dust from entering the cabinet body, and automatic cleaning can be carried out after the filter screen plate is blocked, so the heat dissipation box ensures normal operation of important communication equipment; the box is suitable for being popularized and applied as a heat dissipation box of electronic information communication equipment.