84results about How to "Free lift" patented technology

The invention relates to a distributing and discharging device for a centrifuge. The device comprises a shell, a base, a drum, a feeding pipe and a scraper blade; the feeding pipe comprises a feeding hole outside the shell and a distributing hole in the shell; the base comprises a lifting drive device for driving the feeding pipe to move along the axial direction thereof, a rotating drive device for driving the feeding pipe to rotate along the axis thereof, and a supporting seat for connecting the shell, the lifting drive device and the rotating drive device; the scraper blade is positioned on the outer side of the distributing hole of the feeding pipe, and the edge of the scraper blade is staggered with the distributing hole in the circumferential direction encircling the axis of the feeding pipe; and when the feeding pipe rotates to the edge of the scraper blade and faces the inner wall of the drum, the distributing hole faces a main shaft. By adopting the structure, the distributing range can be controlled so that the distribution is uniform; and the distributing device and the scraper device are integrated so as to facilitate the operations such as installation, repair, later maintenance and the like and quickly, repeatedly and automatically distribute and scrape materials.

The invention relates to the field of display screen supporting frames, in particular to a novel telescopic spring supporting frame. The novel telescopic spring supporting frame comprises a base, an extension arm, a lifting supporting arm and a display screen hanging tool. The base is provided with the extension arm. An extension arm connecting joint is arranged at the top end of the extension arm and provided with the lifting supporting arm. A swinging head is arranged at the head end of the lifting supporting arm. The display screen hanging tool is arranged at the top end of the swinging head. The extension arm, the lifting supporting arm and the display screen hanging tool are upwards arranged in an oblique angle manner (the display screen hanging tool can be adjusted in a pitching manner), the lifting supporting arm conducts universal rotation with the extension arm connecting joint as the axis, and the lifting supporting arm conducts universal rotation with the swinging head as the axis.

The invention discloses a buried nozzle which comprises a telescopic tube. A slider is fixed at one end of the telescopic tube. The other end of the telescopic tube is connected with a nozzle through a rotary connector. A spring is sleeved on the telescopic tube. A cap is arranged at the top of the nozzle. A sleeve is sleeved on the slider. A water inlet tube is arranged at the bottom of the sleeve, and a retainer ring is disposed at the top of the sleeve. The buried nozzle is capable of ascending and descending freely to change the spray irrigation range.

The invention discloses a general satellite sun wing expanding frame automatically adjusting levelness. The general satellite sun wing expanding frame automatically adjusting levelness is composed of a mechanical system and a control system. The mechanical system mainly comprises two upper guide rails, two driving mechanisms, a main beam, a hinged telescopic mechanism and a rigid connection telescopic mechanism. The mechanical system of the sun wing expanding frame is fixed to opposite brackets arranged on the two sides of an infrastructure, and the two upper guide rails are welded to the brackets. The upper guide rails are connected with the main beam. The main beam is driven by the driving mechanisms to move on the upper guide rails, and then the whole system can move in the appointed area. According to the general satellite sun wing expanding frame automatically adjusting levelness, a contact gap and unnecessary constraint are eliminated, a lifting mechanism ascends and descends freely, the clamping phenomenon in the lifting process is eliminated, swinging of a platform is eliminated, the leveling effect and stability of the system are guaranteed, the position of the expanding frame is changed freely, and the expanding frame ascends and descends freely in the height direction, and the accurate and automatic adjustment of 0.04 mm / m of the levelness of the guide rails is achieved.

The invention discloses a lifting-type charging pile based on the field of new energy. The lifting-type charging pile structurally comprises a lifter, a base, a card reader, a charging pile body, a top shed, three indicator lights, a display device and a panel. The outer wall of the lifter is perpendicularly welded to the upper end of the outer wall of the base. The card reader is fixed to the front end of the outer wall of the charging pile body through a bolt. The top of the charging pile body is in interference fit with the bottom of the top shed. The three indicator lights are mounted at the upper end of the front side of the charging pile body. The indicator lights are electrically connected with an internal mainboard of the display device through wires. The display device is fixed tothe interior of a groove in the front end of the panel through a clamping buckle. According to the lifting-type charging pile based on the field of the new energy, the lifter flexibly and conveniently makes the charging pile body rise and fall, and the effects that the improved lifting-type charging pile based on the field of the new energy can freely rise and fall and the lifting-type charging pile is contracted into a protective shell so as to reduce damage and prevent erosion of water vapor when the lifting-type charging pile is not used are achieved,.

The invention belongs to the technical field of pressure vessels and particularly discloses a vertical type pressure vessel for glassed steel equipment. The vertical type pressure vessel aims at solving the problems that a vertical type pressure vessel is low in flexibility, inconvenient to use and low in safety coefficient. The vertical type pressure vessel comprises a base. Hydraulic cylinders are arranged at four corners of the outer wall of the top of the base, and a first vibration reduction pillar is fixed to the outer wall of the top of each hydraulic cylinder through screws. A same connecting plate is fixed to the outer walls of the tops of the two first vibration reduction pillars at each side of the base through screws. Two connecting brackets are arranged on the outer wall of one side of each connecting plate. A same fixing plate is fixed to the outer walls of one sides of every two connecting brackets through screws, and a display screen and an alarm device are fixed to theouter wall of one side of each fixing plate through screws. By means of the vertical type pressure vessel, universal wheels can be ascended and descended freely; movement and fixation of the equipment can be completed; flexibility is high; a protective housing can be firmly fixed, and the phenomenon that the protective housing falls off due to collision is avoided; and by means of reset springs and clamping blocks, clamping flexibility and stability are improved.

The invention relates to a lifting trammer for a three-dimensional particle image velometer. The lifting trammer comprises a first trammer for placing a laser emitter and a generator, a second trammer for placing a side view type CCD camera, a third trammer for placing an overlooking-type CCD camera and a fourth trammer for placing an optical arm and an optical source; each trammer comprises a belt pulley and a free movable stand; the stand is provided with a working platform for placing a corresponding part of the velometer; and the working platform is connected with the stand through a lifting mechanism. The lifting trammer has the advantages that the lifting trammer freely lifts and moves the three-dimensional particle image velometer and has convenient use and low cost.

The invention discloses a storey height adjustable house structure with variable-position X-shaped steel supports. The storey height adjustable house structure comprises spring concave connecting pieces, convex connecting pieces, fixed pulleys, steel wire ropes, a motor, the X-shaped steel supports, variable-position pulleys, clamping gears, rotating shafts, metal clamping keys, outer walls, a first-layer floor, a second-layer floor, a door, stairs and windows. The motor rotates clockwise to lift the steel wire ropes through the pulleys to enable the rotating shafts to rotate, the rotating shafts are fixedly connected with the clamping gears, the metal clamping keys are connected with the rotating shafts through steel wires, the rotating shafts rotate to drive the metal clamping keys to contract, the clamping gears start to rotate, the variable-position pulleys start to roll on rails through rotation of the clamping gears, the X-shaped steel supports contract through movement of the variable-position pulleys, and therefore the first-layer floor ascends. The first-layer floor can descend slowly to recover the original state, a house is of a normal second-layer building structure, and the requirement of people for normal rest and life is met.

The invention relates to a large-sized slide supporter with a core overturning table. The large-sized slide supporter comprises a core overturning table and a support frame. A slide is arranged on the core overturning table. A supporter and a preset screw are disposed in the slide. The supporter is slid according to the positions of core columns and clamps in a transformer, a proper position is selected, automatic lifting is allowed, and a core is fixed very flatly. The supporter can be conveniently added as required during core laminating, the support frame is screwed up, and local droop deformation under great pressure of the core is avoided. After core laminating, when the core is turned and erected, slipping is avoided. Process defects in core manufacture can be eliminated, process level is increased, and product quality is guaranteed. Operation is flexible for constructors, using is convenient, labor intensity is lower, work efficiency is higher, and rework is avoided.

The invention discloses a three-dimensional full-automatic distribution machine. The three-dimensional full-automatic distribution machine comprises an outer frame, wherein a lifting frame is connected to the outer frame in a sliding mode, four hydraulic cylinder assemblies are connected to the lifting frame, and the lifting frame is pushed to slide up and down on the outer frame by the four hydraulic cylinder assemblies; a traverse moving frame is connected to the lifting frame in the sliding mode, the traverse moving frame can slide from left to right on the lifting frame, a longitudinal moving frame is connected to the traverse moving frame in the sliding mode, and the longitudinal moving frame can slide from front to back on the traverse moving frame; and a hopper assembly is arrangedon the longitudinal moving frame, the hopper assembly comprises a hopper main body, a fixed frame is arranged on the upper part of the hopper main body, a plurality of weighing sensors are arranged onthe lower end of the fixed frame, and the lower ends of the weighing sensors are connected with the longitudinal moving frame. According to the three-dimensional full-automatic distribution machine,a three-dimensional movement driving mode is adopted, the distribution machine can be reliably operated in the directions of an X axis, a Y axis and a Z axis, products are identified, and proper procedures are selected to distribute by a controller, so that automatic distribution is realized, and the distribution requirements of users on different member products are met.

The invention relates to an overhead adjustable terrace system. The overhead adjustable terrace system is characterized in that a wooden square edge keel, a plurality of height adjusting assemblies, aplurality of base plates and a surface layer are arranged; the wooded square edge keel is laid on the ground and arranged below the side edge of the surface layer, the height adjustment assemblies are arranged on the ground, a plurality of partition plates are arranged on the upper surface of the height adjustment assemblies, gaps formed between adjacent partition plates are matched with cornersof the base plates, one sides of the base plates at the side edge are supported on the wooded square edge keel, the other side of the base plates at the side edge are supported on the height adjustment assemblies, and the corners of the base plates in the middle are separately supported on the different height adjustment assemblies; and the surface layer is laid on the base plates, and an overheadstructure is formed between the lower surfaces of the base plates and the ground. The overhead structure is favorable for arranging water and electricity pipelines, and has the effects of convenientleveling, simple construction and the like.

The invention discloses a double-rod well drilling machine. The double-rod well drilling machine comprises a rack, a traction device arranged on the rack, a power head movably installed on the rack, drilling rods fixedly installed at the bottom of the power head, wherein the power head comprises a drilling machine head, movable sleeves fixed at two sides of the drilling machine head, a motor fixed at the top of the drilling machine head, a hanging frame, a grouting pipe and drilling rod seats fixed at the bottom of the drilling machine head. The double-rod well drilling machine is characterized in that the drilling rod seats include an outer drilling rod seat and an inner drilling rod seat fixed inside the outer drilling rod seat; the drilling rods include an outer drilling rod and an inner drilling rod arranged in the outer drilling rod; the outer diameter of the inner drilling rod is smaller than the inner diameter of the outer drilling rod; the inner drilling rod is in threaded connection with the inner drilling rod seat; and the outer drilling rod is in threaded connection with the outer drilling rod seat. The double-rod well drilling machine of the invention has the advantages of stability, reliability, easiness in assembly and disassembly and multi-purposed performance. With the double-rod well drilling machine adopted, the problem of landslide can be effectively solved, and safety production can be ensured.

The invention discloses a vehicle-mounted lifting lamp being convenient to disassemble and assemble, include a fixing device, the fixing device comprises an object plate, two sets of fixing plates arewelded at the top of the storage plate, circular grooves are arranged on the sides of the fixing plates close to each other, A fixing plate is rotatably connected with a two-way screw at a circular groove, two sets of threaded sleeves are threaded on the outer side of the two-way screw, an L-shaped fixing rod is welded on the top end of the threaded sleeve, one end of the horizontal arms of the L-shaped fixing rod away from each other is welded with a squeeze plate, Two sets of sliding rails are arranged at the top end of the storage plate, and the threaded sleeves are slidably connected withthe sliding rails respectively. The bottom end of the storage plate is welded with a storage basket, and the bottom end of the storage basket is welded with a fixing pipe. The inner wall of the top end of the fixing pipe is provided with a first motor, and the output shaft of the first motor is vertically downward. Compared with the existing device, the invention can be conveniently installed anddisassembled, and is convenient to be adjusted in the interior of the automobile, and is convenient to be changed in height according to the use of the user.

The invention belongs to a device for clearing industrial circulating water, and in particular relates to a floating oil absorber. An absorber box body consists of a bottom plate and an upper sealing plate through the closed periphery; counterweight supports are uniformly distributed on the surface of the upper sealing plate of the box body along the outer edge of the surface of the upper sealing plate; counterweights are arranged on the counterweight supports; an oil collecting tank with an open upper part is arranged in the center of the upper sealing plate of the box body; the center of the oil collecting tank is fixedly connected with an upright blow-off pipe through a bracket; a channel is reserved between the lower end of the blow-off pipe and the upper sealing plate of the box body; the top surface of the oil collecting tank is lower than that of each counterweight support; an upper opening of the blow-off pipe is connected with the inlet of a pneumatic diaphragm pump through a hose; and the outlet of the pneumatic diaphragm pump is communicated with a blow-off tank through a guide pipe. The device can automatically clear oil stain on the surfaces of various static liquids under the unattended condition, has small volume, can be placed in various box bodies and water tanks, occupies a small space, and is easy and convenient to operate and convenient to manufacture and maintain.

The invention discloses a double-drill-pipe well sinker which comprises a rack, a traction device arranged on the rack, a power head movably arranged on the rack and drill pipes fixedly arranged at the bottom of the power head. The power head comprises a drilling machine head, movable sleeves fixed to the two sides of the drilling machine head, a motor, a hooking frame, a grout pipe and drill pipe seats fixed to the bottom of the drilling machine head, and the motor, the hooking frame and the grout pipe are fixed to the top of the drilling machine head. The double-drill-pipe well sinker is characterized in that the drill pipe seats comprise an outer drill pipe seat and an inner drill pipe seat arranged in the outer drill pipe seat, the drill pipes comprise an outer drill pipe and an inner drill pipe arranged in the outer drill pipe, and the outer diameter of the inner drill pipe is smaller than the inner diameter of the outer drill pipe; the inner drill pie is in threaded connection with the inner drill pipe seat, and the outer drill pipe is in threaded connection with the outer drill pipe seat. The double-drill-pipe well sinker is stable and reliable and convenient to dismount and mount, achieves multiple purposes, and can effectively solve collapse problems and guarantee production safety.

The invention relates to a building construction device, more specifically a material rack for building construction. The height adjustment mechanism is driven by a worm gear, which can realize lifting and locking, and has high safety; the first connecting rod on the front end of the lifting frame, The second connecting rod at the front end, the first connecting rod at the rear end, and the second connecting rod at the rear end realize sliding and hinged connection through the connecting rod connection device, and the first connecting rod at the front end, the second connecting rod at the front end, the first connecting rod at the rear end, and the rear end The second connecting rod at the end is respectively supported at the four corners of the rectangular lifting plate, which can realize the free lifting of the device, and the structure is stable; there is a dumping device on the material box, which can be driven by gear I and rack I to realize the tilting of the material box. Convenient material loading and unloading. A material rack for building construction, comprising a bottom plate, a height adjustment mechanism, a lifting frame, and a material box. box.

The invention relates to a platform with a lifting structure, which comprises at least a plane (1), a middle frame (2), a lifting system (3), a lifting surface (4), and rolling parts (5). The plane and The middle frame (2) forms a bottomless cube structure with space inside, the lifting system (3) is fixed inside the cube, and the lifting system (3) is connected to the lifting surface (4), on which the lifting surface (4) A rolling element (5) is provided; the rolling element (5) is arranged between the lifting surface (4) and the plane (1), and the rolling element (5) is provided on the plane holes or slots (6). A sliding device with a lifting structure is used on the pallet to improve the efficiency of unloading the goods from the pallet; and the sliding device can be lifted and lowered freely later, and the sliding structure is lower than the top during transportation to ensure that the goods are on the pallet stability.

The invention discloses a vehicle-window protective screening of a rear-side vehicle door. The vehicle-window protective screening of the rear-side vehicle door comprises a vehicle-window outer portion of the vehicle-window protective screening, a vehicle-window inner portion of the vehicle-window protective screening and a vehicle-window internal use shading pleated cloth curtain part which is connected with the vehicle-window inner portion of the vehicle-window protective screening. The vehicle-window outer portion of the vehicle-window protective screening comprises a nylon cloth doorframe outer covered edge, an outer protective screening, an outer window of a convenient window and a magnetic absorbing iron bar. The vehicle-window inner portion of the vehicle-window protective screening comprises a nylon cloth doorframe inner covered edge, an inner protective screening, an inner window of the convenient window and a locating snap fastener of a shading curtain. The vehicle-window internal use shading pleated cloth curtain part is connected with the vehicle-window inner portion of the vehicle-window protective screening through the snap fastener of the shading curtain. The vehicle-window protective screening is simple in structure and convenient to install and dismantle, and an extra installation structure is not needed. The lifting and dropping of a vehicle-window glass cannot be influenced, and the privacy in a vehicle can be effectively protected.

The invention discloses a lifting and detachable chair capable of being spliced into a desk; the chair occupies a small space, is convenient to move, and can be detached and lifted; and in addition, a plurality of chairs can be spliced into the desk. Each chair is equipped with a chair surface and four lifting chair legs; tenons on the tops of the chair legs can be directly inserted into grooves at the bottom of the chair surface; and tenon and groove parts are arranged around each chair surface and are mutually matched. A plurality of grooves can be designed into different heights at the middle parts of the chair legs, and the chairs or the desk (spliced from the chairs) at different heights can be obtained by inserting rivets into the grooves. As long as a plurality of chairs are equipped, desks with different desk top sizes can be spliced on demand by splicing the tenons and the grooves on the side parts of the chair surfaces, and the heights which are actually required can be also met through the lifting of the chair legs. According to the multifunctional chair, a plurality of spaces can be saved, the use is convenient, and the indoor and outdoor use needs can be fully met.

The invention discloses a horizontal type mixing machine. The horizontal type mixing machine is characterized by comprising a horizontal type mixing tank supported on a frame, wherein the frame is provided with a supporting platform on the horizontal type mixing tank; a lift type end cover and a dust collector are arranged on the platform; the lift type end cover comprises an upper end cover which is matched with an opening of the horizontal type mixing tank; a sealing piece is arranged between the upper end cover and the opening of the horizontal type mixing tank; the two sides of the upper end cover are connected with piston rods; the piston rods are matched with cylinders; the cylinders are fixed on the platform through a cylinder body bracket; a charging hole and an air outlet are formed in the upper end cover; and the air outlet is connected with the dust collector. The horizontal type mixing machine has the advantages that the machine has a simple structure and is convenient to use, power materials are not leaked in the mixing process, the end cover of the mixing machine can be easily and freely opened and closed simultaneously and makes the mixing machine tightly sealed, dust generated in the mixing process can be recycled, and the like.

The invention relates to a water conservancy irrigation closed system which includes a water channel for water diversion and a water blocking mechanism installed on the water channel. The water channel communicates with a crop pond for planting crops; the water blocking mechanism includes a sliding chute fixedly arranged in the water channel, a flashboard slidably matched in the sliding chute, a control box arranged on the water channel, and a supporting shaft rotatably supported on the control box; an unwinding reel is coaxially fixed to the supporting shaft, a drawstring is wound on the unwinding reel, one end of the drawstring is fixed to the unwinding reel, the other end of the drawstring is fixed to the flashboard, and the supporting shaft is connected with a driving device; and a control device is arranged between the crop pond and the water blocking mechanism. By arranging the control device between the crop pond and the water blocking mechanism, when the water level in the croppond reaches a certain height, the control device can control the flashboard of the water blocking mechanism to automatically lower to block water, and convenience during use is improved.

A binding for skis and / or splitboard and / or roller skis and / or snowshoes permitting free lifting of the heel, which permits to lift the front part of the foot. The object of the present solution is also and adapter for standard bindings, a method of binding shoes for skis and / or splitboard and / or roller skis and / or snowshoes, and also a shoe for riding skis and / or splitboard and / or roller skis intended for use in bindings permitting free lifting of the heel.

The invention relates to the field of daily necessities, in particular to a multifunctional toilet stool and a use method thereof. The multifunctional toilet stool comprises a toilet stool body, a lifting platform, a lifting device, a child foot placement area, a worktable, an air freshener, a foot rest, a control box, leads, a wireless communication module, an automatic massager, a USB (universalserial bus) jack and a photoresistor. The lifting device is mounted on the inner side of the toilet stool body through screws, the lifting platform is mounted on the toilet stool body through screws,the child foot placement area is mounted on the inner side of the lifting platform through screws, the worktable is mounted at the top end of the lifting platform through screws, an air freshening device is mounted in a groove in the worktable, the foot rest is mounted on the toilet stool body through screws, the control box is inlaid into the groove of the toilet stool body, and the wireless communication module, the automatic massager, the USB jack and the photoresistor are fixed onto the toilet stool body through the leads. The multifunctional toilet stool is simple in structure, easy to mount, suitable for wide crowds and low in cost, heights can be adjusted, skid resistance and heating are realized, official businesses are handled, and indoor space can be effectively saved.

The invention relates to a pontoon anti-icing system and a pontoon anti-icing method based on icing probability prediction, and belong to the technical field of pier safety equipment. The system is characterized by comprising at least a lifting mechanism for driving the pontoon to move up and down, a prediction module that predicts an icing probability, and a controller for controlling the liftingmechanism to act according to the logic judgment value of the prediction module. By adopting the technical scheme, the anti-icing pontoon system and method based on icing probability prediction can effectively predict whether a water area is iced or not, and a pontoon is lifted in advance by using an electromechanical full-automatic lifting column, so that the damage of ice load to the pontoon can be effectively prevented; and the anti-icing pontoon system and method are particularly suitable for the water areas where the ring, the Circum-Bohai-Sea and the sea river mouths and river yachts are moored and are easily influenced by ice disasters in winter.

The invention relates to a liftable outdoor advertising board using wind power generation. The liftable outdoor advertising board using wind power generation comprises an advertising board body, a left brace and a right brace, and further comprises a cleaning mechanism and a lifting mechanism, wherein the advertising board body is connected with the left brace and the right brace; the advertisingboard body is connected with the left brace and the right brace through the lifting mechanism; the whole advertising board lifts by the lifting mechanism through lead screws and rotating nuts, the structure is compact, and the service life is long; and meanwhile, the cleaning mechanism drives a pipeline and a brush to clean an advertising board panel through a gear rack, cleanness of the advertising board is ensured, attractiveness is facilitated, the lifting mechanism is powered by a wind power generation mechanism, and the advertising board does not need to be connected with an external power supply, and is convenient and practical.

The invention belongs to the technical field of a clothes rack appliance, and particularly relates to a tower type lifting clothes rack. The tower type lifting clothes rack disclosed by the invention comprises a pedestal, wherein two lower pipes are arranged on the pedestal; the lower ends of the two lower pipes are connected in a hinging way; the upper ends of the two lower pipes are respectively connected with two upper pipes; the upper ends of the two upper pipes are connected in the hinging way; the lower ends of the two upper pipes are respectively connected into the lower pipes in a sheathing way; the cross sections between the upper pipes and the lower pipes are respectively provided with a locking device; the locking devices respectively comprise a locking seat; the locking seats are respectively fixedly arranged on the top ends of the lower pipes; a spanner is arranged on each of the locking seats; the spanners can be respectively tightly locked with the upper pipes; clamping pieces are respectively arranged on the upper pipes and the lower pipes; hanging plates are respectively arranged on the clamping pieces in a clamping way. The tower type lifting clothes rack can be lifted freely, so that more clothes can be dried; moreover, the clothes rack is simpler and more convenient to lift, and easier to operate.

The invention discloses a toning drawing table for animation design, which comprises a base, a screw rod, a fixing mechanism, a flushing mechanism and an adjusting mechanism; the upper end of the screw rod is sleeved with a lifting cylinder; the fixing mechanism comprises a fixing shell, a clamping mechanism, an air cylinder and a connecting rod slider mechanism; a palette is fixed on a clamping seat; the flushing mechanism is arranged between the operation table and the base and comprises a water inlet tank, a waste water tank and a flushing pool; the water inlet tank is communicated with the flushing pool through a water inlet pipe; the waste water tank is communicated with the flushing pool through a water discharging pipe; the waste water tank is communicated with the flushing pool through a water discharging pipe; the adjusting mechanism comprises a pair of supporting rods, an adjusting part and a connecting plate; the connecting plate is rotatably connected to the adjusting part; and a drawing board is fixedly connected to the connecting plate. According to the toning drawing table for animation design, a palette can be fixed, so that the palette is placed more stably, and the palette cannot be knocked over due to collision of external force.

The invention provides a portable workbench, comprising a workbench body, a support body arranged on the workbench body, a tool switching device which is connected with the support body through a supporting device and is arranged in the middle of the support body, a work plate which freely lifts in the workbench body, and a control panel which is arranged at the side of the workbench body and is used for controlling the whole workbench. The portable workbench provided by the invention has the beneficial effects that a tool can be rotated to the front of an operator according to the needs of the operator, so that the tool can be put in the hand quickly and conveniently; meanwhile, the work plate can be freely lifted according to the height requirements of processed workpieces, so that the work efficiency is improved.