66results about How to "Change contact position" patented technology

The invention provides a turning, grinding and polishing all-in-one machine device for a rubber roller. By the adoption of the turning, grinding and polishing all-in-one machine device for the rubber roller, turning, grinding through a grinding wheel and polishing through an abrasive belt can be achieved at the same time. According to the turning, grinding and polishing all-in-one machine device for the rubber roller, a turning machine, a grinding machine and a polishing device for the rubber roller are highly integrated, and new functions are additionally achieved based on the grinding machine special for the rubber roller. A power machine head used for making a workpiece rotate is installed at one end of a machine body, and a machine tail is installed at the other end of the machine body; a spindle is arranged on the machine head; one end of the spindle is connected with a chuck, and the other end of the spindle is connected with a power device; a center used for fixing the workpiece is arranged on the machine tail, and the spindle of the machine head and the center of the machine tail are located on the same center line; a measurement device is installed on the upper surface of the machine body; and an annular abrasive belt driving and tensioning device is installed on a workbench. A whole annular abrasive belt can rotate around the axis of a driving wheel, so that the contact angle between the abrasive belt and the workpiece is changed, and accordingly the position, making contact with the workpiece, of the abrasive belt is changed, and different machining requirements are met.

The invention discloses a portable manual curved screen printing machine, and belongs to the technical field of printing machines. The portable manual curved screen printing machine comprises a mounting seat, wherein cushion blocks are arranged at four corners of the bottom of the mounting seat; the center of the inner wall of the bottom of the mounting seat is connected with a rotating rod through a bearing; and the bottom of the rotating rod extends to the outer wall of the bottom of the mounting seat and is provided with an adjusting handle. When workpieces to be printed with different sizes are printed, a screen needs to be replaced, an inner threaded sleeve can be rotated according to the size of the screen, the inner threaded sleeve rotate to enable two groups of lead screws on the upper side and the lower side to stretch and retract at the same time, the distance between two groups of clamping plates on the upper side and the lower side is changed, then clamping pieces of the screen slide left and right, the screen is fixed through the clamping pieces of the screen, then a movable rod and a plugboard move left and right according to the size of the screen, and the length ofthe plugboard inserted into a U-shaped clamping block is changed, so that a scraper assembly is attached to the edge of the screen when descending, and the screen is prevented from warping when a plugboard assembly descends

The invention provides an MEMS pressure sensor device and a packaging method thereof. The MEMS pressure sensor device comprises the components of an integrated circuit, an MEMS pressure sensor which is connected with the integrated circuit, and a packaging assembly. The packaging assembly comprises a substrate and a cover plate. The cover plate is connected with the substrate and an accommodating space is formed, wherein the MEMS pressure sensor and the integrated circuit are connected with the substrate and are arranged in the accommodating space. The substrate is provided with a ventilation hole. Outside atmosphere contacts with the MEMS pressure sensor through the ventilation hole, so that the MEMS pressure sensor is suitable for sensing the outside air pressure through the back part of the MEMS pressure sensor.

The invention discloses an operation table for cutting a hardware pipe fitting. The table comprises a supporting platform, wherein the supporting platform is provided with a bracket and a lifting frame, the bracket is provided with a mounting plate, the mounting plate is provided with a rotating air cylinder, a rotating disc and fixed guide rails, the rotating air cylinder is connected with the rotating disc, and the fixed guide rails are distributed around the center of the rotating disc; the fixed guide rails are slidably connected with guide blocks, wherein the portion between each guide block and the rotating disc is connected with a corresponding transmission rod, each transmission rod is connected with the eccentric position of the rotating disc, and the fixed guide rails are provided with arc-shaped clamping plates; the center of the rotating disc is provided with a fixed rod, wherein one end of the fixed rod is provided with a positioning disc, elastic seats are distributed around the positioning disc, and each elastic seat is provided with a corresponding arc-shaped pressing plate; and the lifting frame is close to the positioning disc, wherein the top end of the lifting frame is provided with an arc-shaped supporting plate. The operation table for the cutting hardware pipe fitting has the advantages of being novel in structure, suitable for cutting operation of hardware pipe fittings of different pipe diameters, wide in applicable range, and stable and reliable in placement, and accordingly cutting quality can be improved.

The invention discloses a rubber roller belt sander, wherein a long strip-shaped support frame is positioned on a base; a driving wheel can be rotationally positioned at one end of the support frame; a driven wheel can be rotationally positioned at the other end of the support frame; the driving wheel and the driven wheel are arrayed in parallel; a ring-shaped abrasive belt is arranged on the driving wheel and the driven wheel in a sleeving manner; the driving wheel is driven by a motor to rotate; a driven shaft on the driven wheel is inserted in a shaft sleeve at the other end of the support frame; and the driven shaft can be driven by a deviation rectifying adjusting device on the shaft sleeve to rotate around a shaft perpendicular to the axial direction of the driven shaft and the length direction of the ring-shaped abrasive belt. According to the rubber roller belt sander, an adjustment of the axis parallelism of the driving wheel and the driven wheel can be realized, so that the stability of the operation of the abrasive belt can be realized; the tension adjustment of the ring-shaped abrasive belt is convenient, so that the ring-shaped abrasive belt can be adapted to processing of different materials, and the replacement of the ring-shaped abrasive belt is facilitated, the rotation of the whole ring-shaped abrasive belt around an axial line of the driving wheel can be realized, the contact angle of the abrasive belt and a workpiece can be changed, the contact position of the abrasive belt and the workpiece can be changed, and different processing demands can be met.

The invention discloses an artwork display device with timing and charging functions, relates to the technical field of art display, and aims to solve a safety problem. The device specifically comprises a base, a friction transmission mechanism is arranged on the outer wall of the top of the base, a planetary gear mechanism is fixed to the outer wall of the top of the base through supporting legs,a lifting mechanism is arranged on the outer wall of the top of the planetary gear mechanism, and the friction transmission mechanism comprises a friction transmission assembly, a transmission ratioadjusting assembly and a critical pressure adjusting assembly; the friction transmission assembly comprises a friction disc and a friction wheel, and the friction disc is in power connection with theplanetary gear mechanism. When displayed artworks or other parts are touched, twined and other unsafe conditions occur, due to the fact that transmission is established between the friction disc and the friction wheel through the friction force, the transmission torque is the friction force, the rotation resistance is larger than the friction force at the moment, slipping and power interruption occur at the power connection position, and safety is guaranteed.

The invention provides a novel tire press-fit machine. According to an auxiliary press-fit mechanism, multiple connecting shafts are arranged between a first disc and a second disc, the connecting shafts are evenly arranged in the peripheries of the first disc and the second disc, first springs are arranged between the first disc and the second disc in a sleeving mode, and the connecting shafts penetrate out of the upper portion of the first disc to be fixed on a rack; a press-fit angle adjusting block is arranged in the middle of the first disc and the second disc, the upper portion of the press-fit angle adjusting block is connected with an adjusting driving system, and the press-fit angle adjusting block downwards penetrates out of the second disc to extend to form a press head; a connecting arm is correspondingly arranged on the portion, below the second disc, of each connecting shaft, each connecting arm is movably connected with a press-fit block through a rotating shaft, the multiple press-fit blocks correspond to the press head of the press-fit angle adjusting block, and the press-fit angle adjusting block moves up and down to drive the press-fit blocks tighten or loosen. According to the novel tire press-fit machine, adjustment is convenient and rapid, the press-fit mode is more reasonable, and the press-fit success rate and the efficiency are high; the press-fit synchronism is good, press-fit eccentric load cannot be caused, and the safety is good.

The invention discloses a rotary stepping type cable buffer layer ablation fault simulation device and method. The device comprises a power frequency voltage loop unit used for providing voltage applied to a buffer layer and a buffer layer experiment unit connected to the power frequency voltage loop unit and used for simulating a buffer layer ablation fault. The buffer layer experiment unit comprises a buffer layer experiment cavity, a displacement assembly, a rotating assembly and an electrode assembly, wherein the displacement assembly and the rotating assembly are installed in the buffer layer experiment cavity, and the electrode assembly is mainly composed of a ball electrode and a rod electrode. The cable buffer layer is wound on the rod electrode, the displacement assembly is used for controlling the axial position of the ball electrode along the rod electrode, and the rotating assembly is used for controlling the rod electrode to rotate. The high-voltage cable buffer layer ablation process can be rapidly and efficiently simulated, a large number of buffer layer ablation samples are prepared in a short time, and convenience is provided for high-voltage cable buffer layer ablation characteristic research.

The present invention provides a slack eliminating device which improves a life of a yarn hooking member (52) with respect to wearing away caused by traveling of a yarn by changing a position at which a yarn unwound and traveling from a slack eliminating roller (39) makes contact with a yarn hooking member (52). The outer periphery (70) on the top side end part of the downstream side of the slack eliminating roller is formed to be elliptical seen from the axial direction of the slack eliminating roller. The yarn hooking member (52) is expressed by using solid line when placing at long diameter part, and expressed by using two-dot chain line when placing at short diameter part. when the yarn hooking member (52) rotates with respect to the slack eliminating roller (39), the position of the yarn hooking member (52) contacting with the yarn that is unwound from the slack eliminating roller (39) changes in a width D.

The invention provides a vacuum drying device. The vacuum drying device comprises a vacuum chamber and a bearing table which is arranged in the vacuum chamber and is used for bearing a to-be-treated object, wherein the bearing table comprises a bearing platform, a plurality of supporting parts arranged on the bearing platform, and a moving mechanism which can move the supporting parts. According to the vacuum drying device provided by the invention, the supporting parts arranged on the bearing table can be moved, contact positions of the supporting parts and a substrate can be changed, and the problem that in the prior art, contact points of a display substrate and supporting pillars are badly formed is solved.

The invention relates to the technical field of electrical equipment detection, and discloses a current induction structure bringing convenience to adjustment of a transformation ratio. The current induction structure bringing convenience to adjustment of the transformation ratio changes a contacting position of a conductive contact and an inner side wire of a secondary winding coil by acting a rotation shaft through a handle, further changes winding coil turns between an outer lead and one head end of the secondary winding coil, and finally achieves adjustment of the transformation ratio for a current transformer, thereby being suitable for circuits to be tested in different periods, reducing potential safety risks and being higher in applicability.

The invention discloses a workpiece driving device for round-disc type accessory one-time full-surface deposition and a vapor deposition furnace. The workpiece driving device comprises at least one pair of a first rotating disc and a second rotating disc which are matched and support a workpiece and drive the workpiece to rotate around the axis of the workpiece. The first rotating discs and the second rotating discs rotate around axes thereof separately, and change contact positions with the workpieces. The design is ingenious. The first rotating discs and the second rotating discs are matchedand support the workpieces and drive the workpieces to rotate, and therefore it is ensured that during the deposition process, the contact positions between the workpieces and the first rotating discs and the second rotating discs can be changed in real time, the problem that one parts of the workpieces are always blocked and deposition filming can not be formed. Workpiece full-surface depositioncan be achieved by one time deposition. Uniformity of a filming layer obtained by deposition is guaranteed. Application is simple, and film layer quality is high.

The invention discloses an electric reactor with an adjustment function, and relates to the technical field of electric reactors. The electric reactor with the adjustment function comprises a base; a controller is fixedly mounted on the front surface of the base; a box body is fixedly mounted at the top of the base; a top plate is fixedly mounted at the top of the box body; inlet wire seats are symmetrically mounted at the top of the top plate; and radiators are inlaid on two sides of the box body. According to the electric reactor with the adjustment function, a threaded rod, a conductive block, an insulation sleeve, a sliding rod and a conductive rod are arranged; when a motor rotates, the insulation sleeve can move up and down, so that a contact position of the conductive block and each coil is changed, the consumption of electrified coils is changed, the rated inductance of the electric reactor is changed, the electric reactor can meet the requirements of more circuits, the practicality of the electric reactor is improved, working personnel can quickly carry out work, and the working efficiency of the working personnel is improved.

The invention discloses a heat treatment machining device for hot work die steel. The heat treatment machining device comprises a shell, a packing door, a rotating platform, a platform rotation driving part, at least one fixing assembly, an overturning assembly and a clamping and rotating assembly, wherein a cavity is formed in the shell; the rotating platform is arranged in the cavity; the packing door is located above the rotating platform, one part of the packing door is arranged in the cavity, the rest part of the packing door extends out of the shell, and the packing door can divide the cavity into a heat treatment cavity and a cooling cavity and can reciprocate in the cavity; the platform rotation driving part is connected with the rotating platform through a rotating connecting part, so as to drive the rotating platform to rotate; the fixing assemblies are arranged on the rotating platform, so that the hot work die steel can be installed; the overturning assembly is arranged on the packing door and extends into the cooling cavity; and the clamping and rotating assembly is arranged on the shell. According to the device, the problem that in the prior art, die steel cracks after being treated by a heat treatment machining device is solved.

The invention relates to an adjustable transformer, which comprises a housing and an annular core and further comprises a carbon brush and an adjusting device. According to the adjustable transformerof the invention, the adjusting device drives the carbon brush to rotate in the circumferential direction and adjusts the position of the brush head in the radial direction; the reciprocating frictionbetween the brush head and a winding of the annular core on the same circular trajectory is avoided so as to prevent the damage of the winding of the annular core; the moving direction of a sliding brush rod can also be switched so as to enable the brush head to have two moving modes such as expansion and relaxation in the radial direction, and the brush head is enabled to be continuously used; the moving speed of the brush head is very slow, so that it is unnecessary to manually change the moving direction of the sliding brush rod for many times; and the moving speed of the sliding brush rodcan also be adjusted.

The invention discloses a grinding and polishing clamp for stainless steel part machining and a machining technology of the grinding and polishing clamp. The grinding and polishing clamp comprises a base, a mounting seat is slidably mounted in the middle of the upper end of the base, a lifting supporting column is slidably mounted at the upper end of the mounting seat, and a grinding and polishing assembly is fixedly mounted on the upper portion of the rear end of the lifting supporting column. Two stand columns and a driving motor are fixedly installed on the left portion of the upper end of the base, the upper portions of the opposite faces of the two stand columns are jointly and rotationally connected with a shaft rod, and the right end of the shaft rod penetrates through the stand column located on the right side, extends to the right side of the stand column, and a clamping device is fixedly installed at the right end of the shaft rod. According to the grinding and polishing clamp for stainless steel part machining and the machining technology of the grinding and polishing clamp, the automation degree is high, the working efficiency is high, the utilization rate of a grinding abrasive belt and the overall grinding and polishing quality are improved, and the machining yield is improved to a certain degree; and potential safety hazards caused by the fact that stainless steel pipes are not clamped and fly out in the rotating process due to misoperation can be avoided, and safety is high.

The invention discloses an inlet guide plate with a guide wheel for strip steel rolling, coiling and finishing equipment. The inlet guide plate comprises guide plates (10) arranged at both sides of strip steel (1) and used for guiding the operation of the strip steel (1), and guide wheels (3) arranged on the guide plates. The guide wheels (3) are inclined relative to the guide plates (10), namely an included angle (a) of 0-30 DEG is formed between a direction of a circumferential speed of the guide wheels and a forward direction of the strip steel (1). Each guide wheel (3) can move along an axis direction thereof, and a height of the guide wheel can be adjusted. Because the contact of the inclined guide wheels (3) and the strip steel (1) is changed from circumference to ellipse, the linear contact becomes longer, so that a rotating speed of the guide wheels (3) is reduced as compared to a vertical manner, thus the service life of the guide wheels (3) is greatly prolonged, the strip steel (1) is prevented from warping, and leading-in of the strip steel (1) is improved; meanwhile, because a downward component velocity has certain grinding effect on the side part of the strip steel (1), the quality of the side part of the strip steel (1) is improved, and the yield of the strip steel (1) is improved.

The invention relates to the technical field of cylinder cover detection, in particular to a cylinder cover leakage visual detection device which comprises a bottom supporting plate, a guide supporting frame, a cylinder cover sealing limiting component, a cylinder cover leakage detection component and the like. A guide supporting frame is fixedly installed on the top face of the bottom supporting plate, the air cylinder cover sealing limiting component is arranged on the guide supporting frame, and an air cylinder cover leakage detecting component is fixedly installed on the top face of the bottom supporting plate. High-pressure gas is conveyed into the cylinder cover, so that the high-pressure gas pushes all the movable pipes and the rolling balls to move upwards, a worker can judge whether the cylinder cover leaks gas or not by observing whether the height positions of the rolling balls are consistent or not, then the gas tightness of the cylinder cover is judged, and meanwhile the specific position of a leakage point can be deduced according to the position of the rolling ball.

The invention discloses a luggage production device with a vacuumizing function. The luggage production device structurally comprises an object placement plate, a supporting frame, a mounting block, amain body, supporting legs, a cover plate, a display instrument, a controller, adjusting buttons, connecting parts, a bracket, a handle, a cabinet door, a control cabinet, a vacuum pump and an adjustable heater, wherein the upper surface of the main body is fitted to the bottom surface of the mounting block; the bottom surface of the main body is welded with the supporting legs; the display instrument is embedded on the outer surface of the main body. The luggage production device with the vacuumizing function, provided by the invention, is structurally provided with the adjustable heater andthe adjustable heater is connected with the cover plate; the rotary speed of a stepping motor is controlled through a control chip and the rotary shaft is driven to rotate, so that a worm rod drivesa worm wheel to rotate; a matching gear, which is connected with the worm wheel through a connecting rod, rotates and a contact position between a connecting sheet and an adjustable resistance wire ischanged, so that current of a heating plate is changed; the temperature of the heating plate can be adjusted so that the heating plate meets pre-heating of different materials and is more easily blistered.

The present invention provides a MEMS pressure sensor device and packaging method, comprising an integrated circuit, a MEMS pressure sensor connected to the integrated circuit and a packaging component, the packaging component includes a substrate and a cover plate, the cover The board is connected to the substrate and forms an accommodating space, wherein the MEMS pressure sensor and the integrated circuit are connected to the substrate and located in the accommodating space, and the substrate has a vent hole through which the outside atmosphere passes. In contact with the MEMS pressure sensor, the MEMS pressure sensor device is adapted to sense ambient air pressure through its back.

The invention discloses an adjustable multi-purpose backpack cushion. The adjustable multi-purpose backpack cushion comprises a base plate and elastic cushions, wherein two elastic cushions are available and are arranged on the base plate in a left-right symmetric manner, a fan device is arranged between the elastic cushions, a chargeable portable power supply is arranged on the bottom of the front of the base plate, a solar panel is mounted at the upper side of the base plate, a power transmission line of the solar panel is electrically connected to a charging interface of the portable powersupply, and a power transmission interface of the portable power supply is electrically connected to the fan device through a DC-AC inverter; and the fan device comprises brackets, protection shells mounted on the brackets, and fans mounted in the protection shells, a safety fence is fixed at each air outlet opening of the fan device, silicone covers the back of the base plate, and each elastic cushion comprises a silicone layer on the surface and an elastic air bag arranged inside. The fans are mounted in the middle through the brackets, so that the air inlet from the upper-lower side or theleft-right side is convenient, the wind force is strong, then the back becomes dry easily, and thus a user feels comfortable.

The invention discloses a stepless speed change device to solve the problem that gear transmission of the prior art cannot achieve stepless speed change. The stepless speed change device includes a rack, a driving shaft, a driven shaft perpendicular to the driving shaft, a drive block which is installed between the drive shaft and the driven shaft, a worm gear which is rotationally connected to the drive shaft and a worm which meshes with the worm gear. The drive block includes a first bevel gear and a hemisphere block which are fixed together, the drive shaft is provided with a second bevel gear which engages with the first bevel gear, and the driven shaft is provided with a disk which is matched with the hemisphere block. Half of the worm gear is smooth, another half of the worm gear is provided with a worm teeth part with worm tooth. The smooth part is provided with a fixed rod, the drive block and the fixed rod are rotatably connected with each other, and the smooth part and end face of the worm teeth part are both provided with a bumping and a slot both in the shape of an inverted cone. The stepless speed change device is simple in structure and capable of achieving stepless speed change.

The invention discloses a uniform gas supply device for a vapor deposition furnace, and the vapor deposition furnace. The uniform gas supply device for the vapor deposition furnace comprises one or more T-shaped gas uniformizing pipelines, and the directions of gas outlet holes of the gas uniformizing pipelines are opposite to the ascending direction of reactive gas, and the gas outlet holes are back on to workpieces. According to the uniform gas supply device for the vapor deposition furnace, design is ingenious, by setting the directions of the gas outlet holes, the reactive gas can be gradually spread to the workpiece area after flowing out, the problems that when one gas outlet supplies gas to the workpieces directly, gas flow impact is prone to being caused, the reactive gas is proneto being concentrated in a certain area, and consequently the reactive gas is distributed nonuniformly are avoided, the supplying uniformity of the reactive gas can be ensured, and the quality of filmdeposition is improved advantageously.

The invention relates to an electric toothbrush capable of automatically adjusting frequency. The electric toothbrush comprises a fixing cylinder, wherein a fixing groove is formed in the inner wall,close to the top end, of the fixing cylinder, a transmission rod is fixed to the fixing groove through a rubber ring, a vibration motor is fixed to the inner wall of one end, close to the fixing cylinder, of the transmission rod, and a fixing disc is arranged on the inner wall of the transmission rod; a brush head is connected to the center of the fixing disc through a connecting rod in insertingconnection; a rotating hole is formed in the center of one end, close to the connecting rod, of the brush head, a rolling ball is mounted in the rotating hole, a sliding groove is formed in the innerwall of the rotating hole, a resistance coil is mounted in the sliding groove, and a fixing hole is formed in one end, away from the brush head, of the connecting rod; and a telescopic motor is arranged on the inner wall of one end, close to the fixed disc, of the transmission rod, and the edge of one side, away from the telescopic motor, of a rotary disc is connected with the fixing hole througha rotary rod inserted into the fixing hole. Through the cooperative use of the devices, the tongue fur cleaning effect of the electric toothbrush can be improved, the use quantity of electronic components in the electric toothbrush is reduced, and the production cost can be reduced.

The invention discloses a stable supporting device for a girder body. The stable supporting device comprises a set of supporting single parts or at least two sets of supporting single parts, wherein the two sets of supporting single parts are arranged side by side; each supporting single part comprises a base and an adjusting mechanism, and the base is used for bearing the girder body; the adjusting mechanism comprises at least one set of adjustable connection parts, the lower ends of the adjustable connection parts are movably arranged on the bases through connecting parts, and the upper ends of the adjustable connection parts are tightly attached to the girder body. According to the technical scheme, the stable supporting device for the girder body has the advantages that the quantity of the supporting single parts is selected according to the specific condition to meet the using requirement; each supporting single part comprises the base and the adjusting mechanism, the base is used for bearing the weight of the girder body, the adjustable connection parts are used for adjusting the contact position of the upper portion of the supporting device and the girder body, and on the condition that high supporting stability is guaranteed, the stable supporting device is concise in structure, light, and convenient to manufacture, deliver and use; the design of the bases leaves certain gaps between the lower portion of the girder body and the ground or other placing members, and the check of the girder body is facilitated.

The invention provides a multi-sided rotating billboard which comprises a plurality of billboard bodies, a central supporting rod, a supporting platform, a driving mechanism and a billboard installation platform. At least one energy collectors are arranged on the billboard installation platform and used for collecting the mechanical energy generated by vibration of the driving mechanism. Each energy collector comprises an outer frame and an electric conversion component, and connection components are arranged on the outer frames and used for installing the energy collectors on the billboard installation platform. The multi-sided rotating billboard is rotatable and thus has a better display effect, and meanwhile, by increasing the number of multi-sided electronic advertising screens, the advertisement playing effect is better.

The present invention discloses a power feeding system that can efficiently feed power from the power feeding side to the receiving unit. The distance measuring unit (13) measures the inter-coil distance (L1) between the power feeding side helical coil (7) and the power receiving side helical coil (9), and the control units (14, 16) ) to adjust the capacitance of the power feeding side varactor diode (8) and the power receiving side varactor diode (11) by measuring the inter-coil distance (L1).

The invention relates to the technical field of lifeboats, and discloses a lifeboat capable of improving rescue efficiency, the lifeboat comprises a boat body, the inner wall of the boat body is movably connected with a piston, the outer side of the piston is fixedly connected with a web member, and the inner wall of the boat body is fixedly connected with a fixed shaft; and a leather ring is movably connected to the position, close to the outer side of the fixing shaft, of the inner wall of the ship body, a magnetic block is fixedly connected to the inner wall of the leather ring, and a connecting block is fixedly connected to the outer side of the fixing shaft. According to the lifeboat capable of improving the rescue efficiency, by changing the resistance value of a slide rheostat, when a drowning person boards the lifeboat, influence of acting force on the lifeboat body is avoided, the gravity center of the lifeboat body is prevented from changing, the lifeboat body is prevented from shaking, the lifeboat body is prevented from inclining, and the safety coefficient of workers on the lifeboat is improved; the drowning person can be attached to the surface of the lifeboat conveniently, rescue time is shortened, life safety of the drowning person is guaranteed, and rescue efficiency of the lifeboat is improved.

The invention discloses a portable manual curved screen printing machine, and belongs to the technical field of printing machines. The portable manual curved screen printing machine comprises a mounting seat, wherein cushion blocks are arranged at four corners of the bottom of the mounting seat; the center of the inner wall of the bottom of the mounting seat is connected with a rotating rod through a bearing; and the bottom of the rotating rod extends to the outer wall of the bottom of the mounting seat and is provided with an adjusting handle. When workpieces to be printed with different sizes are printed, a screen needs to be replaced, an inner threaded sleeve can be rotated according to the size of the screen, the inner threaded sleeve rotate to enable two groups of lead screws on the upper side and the lower side to stretch and retract at the same time, the distance between two groups of clamping plates on the upper side and the lower side is changed, then clamping pieces of the screen slide left and right, the screen is fixed through the clamping pieces of the screen, then a movable rod and a plugboard move left and right according to the size of the screen, and the length ofthe plugboard inserted into a U-shaped clamping block is changed, so that a scraper assembly is attached to the edge of the screen when descending, and the screen is prevented from warping when a plugboard assembly descends