33results about How to "Avoid self-fall" patented technology

The invention relates to an engine demounting and mounting trailer. According to the technical scheme, the trailer is composed of a mounting vehicle, a demounting and mounting platform and a hydraulic system. The mounting vehicle comprises a walking mechanism, two lifting mechanisms, a transverse moving mechanism and a guide rail mechanism. The two lifting mechanisms are installed at the two ends of the walking mechanism respectively and drive the transverse moving mechanism to ascend or descend, and the transverse moving mechanism drives the guide rail mechanism to move. The mounting vehicle and the demounting and mounting platform are movably connected through the guide rail mechanism. The demounting and mounting platform comprises a platform, a longitudinal sliding guide rail, a carriage, a bracket, a main fixing supporting piece, an auxiliary fixing supporting piece, a bearing outrigger, an adjusting pull rod and a traction device. The lifting mechanisms are controlled by the hydraulic system. The trailer is simple in operation, the position of an engine conveying device can be adjusted on the X axis, the Y axis and the Z axis in six directions, forward movement, backward movement, transverse movement, ascent, descent and rolling movement can be achieved, and therefore the requirements for separating and matching of butt joint working faces are met.

The invention discloses a multifunctional branch trimmer. The multifunctional branch trimmer comprises a supporting rod, a clamping rod and a saw rod which are sequentially arranged from inside to outside, wherein the supporting rod, the clamping rod and the saw rod are all insulating telescopic rods with limiting members, a first-section clamping rod at the uppermost end of the clamping rod is of a hook body with a rightward opening, a sliding groove is formed in a first-section saw rod at the uppermost end of the saw rod, a saw blade which can slide along the sliding groove is inserted in the sliding groove, the upper end of the saw blade is connected with the upper end of the first-section saw rod through a spring B, the lower end of the saw blade is connected with a steel wire rope, the steel wire rope is wound on a hand capstan, the hand capstan is mounted on the saw rod, the lower part of the first-section saw rod, the lower part of the hook body and the lower part of a first-section supporting rod at the uppermost end of the supporting rod are connected through a rotating shaft, and a base is mounted at the bottom of the supporting rod. The branch trimmer does not need additional power supplying, and workers can directly trim branches at high places on the ground, so that the branch trimmer is convenient and laborsaving in use, and the branches can be prevented from directly falling off in the air and damaging power supply lines.

The invention provides a servo pump control hydraulic system which comprises an oil cylinder and a two-way hydraulic pump driven by a servo motor. The hydraulic pump is connected with an oil tank. One end of an oil in / out opening of the hydraulic pump is connected with an upper cavity of the oil cylinder, and the other end of the oil in / out opening of the hydraulic pump is connected with a lower cavity of the oil cylinder through a branch a and a branch b. A back pressure valve is arranged on the branch a, and a poppet valve is arranged on the branch b. The branches between the oil in / out opening of the hydraulic pump and the oil tank are each provided with an oil supplementing one-way valve; the upper cavity of the oil cylinder is connected with a one-way valve II, and the lower cavity of the oil cylinder is connected with a one-way valve I; the one-way valve I is connected with a prefill valve through a branch c and a branch d, the one-way valve II is connected with the prefill valve through the branch c and the branch d, and the branch c is provided with an electromagnetic ball valve. Hydraulic oil flowing through the electromagnetic ball valve controls opening and closing of the refill valve, and the branch d is provided with a safety valve. By means of the hydraulic system, energy consumption can be greatly lowered, the operation efficiency of a hydraulic machine and the operation efficiency of a bending machine are improved, and oil consumption of the hydraulic system is reduced.

The invention discloses a multi-way valve for a tractor hydraulic lifter. The multi-way valve for the tractor hydraulic lifter comprises a valve body, wherein an oil inlet cavity, an oil channel A, an oil channel B, an oil outlet cavity A, an oil outlet cavity B, an oil return cavity A, an oil return cavity B and a valve rod are arranged in the valve body, and the valve rod is in hermetic and sliding connection with the valve body; the valve rod is provided with annular grooves corresponding to the oil channel A, the oil channel B, the oil outlet cavity A, the oil outlet cavity B, the oil return cavity A and the oil return cavity B, an operating end of the valve rod is connected with a handle, and a pressurization cavity is further formed in the valve body; when the valve rod slides to the direction of the oil outlet cavity B, the oil channel A communicates with the oil outlet cavity A, and the oil channel B communicates with the pressurization cavity; a hydraulic reset hole is formedin the interior of the valve rod in the axial direction, an inlet end of the hydraulic reset hole communicates with the pressurization cavity, an outlet end of the hydraulic reset hole faces a non-operating end of the valve rod, and a reset device is arranged at the non-operating end of the valve rod. According to the multi-way valve for the tractor hydraulic lifter, automatic reset function is realized in the descending state and the lifting state of an agricultural implement, the valve rod does not need to be manually reset manually, and the operation is convenient.

The invention provides a hydraulic system for an overhead working truck. The hydraulic system for the overhead working truck comprises an oil tank and a hydraulic pump, wherein an oil inlet of the hydraulic pump is connected with the oil tank. The hydraulic system for the overhead working truck further comprises a lower supporting leg hydraulic system, an upper working device hydraulic system, anemergency lowering hydraulic system and an upper-lower selection valve, wherein an oil outlet of the hydraulic pump is connected with an oil inlet of the upper-lower selection valve, a first oil outlet of the upper-lower selection valve is connected with upper working device hydraulic system, and a second oil outlet of the upper-lower selection valve is connected with the lower supporting leg hydraulic system. The emergency lowering hydraulic system is connected with the upper working device hydraulic system. According to the hydraulic system for the overhead working truck, an automatic switching between the lower supporting leg hydraulic system and the upper working device hydraulic system is achieved through the upper-lower selection valve, therefore manual operation is avoided, manpoweris saved, and when the hydraulic system for the overhead working truck breaks down, the emergency lowering hydraulic system can be used for retracting an arm support.

The invention discloses a high-viscosity material sampling structure, which comprises a ball valve body, a ball valve core and a control structure, wherein the ball valve body is arranged on the high-viscosity material conveying pipeline; the ball valve core is matched with an inner cavity of the ball valve body; the ball valve core is rotationally matched in the ball valve body; the control structure is in transmission connection with the ball valve core; the ball valve body is provided with a medium inlet and a medium outlet; a medium flow channel with the two ends penetrating through the ball valve core is formed in the ball valve core;the ball valve body is further provided with a sampling opening and a pushing and pressing device; the sampling port is arranged between the medium inletand the medium outlet; a valve is arranged at the sampling port; the pushing and pressing device is arranged opposite to the sampling port; a pressure relief space is arranged between the ball valvebody and the valve and / or between the ball valve body and the pushing and pressing device, and the valve and / or the pushing and pressing device are / is communicated with an inner cavity of the ball valve body through the corresponding pressure relief space. The invention further discloses a sampling method adopting the high-viscosity material sampling structure. According to the high-viscosity material sampling structure and method, sampling is safe and efficient, and coagulation and blockage are not likely to happen.

The invention relates to the technical field of semiconductor processing equipment, and particularly relates to a dispensing machine for a semiconductor. The machine comprises a machine body, a conveyor is mounted on the top surface of the machine body, a support is fixedly connected to the top of the machine body, a dispensing device is mounted on one side of the support, and a supporting sleeve is fixedly connected to the bottom surface of the dispensing device. And a glue dispensing column is slidably connected into the supporting sleeve, a plurality of glue dispensing pipes are arranged in the glue dispensing column, and the bottom surfaces of the glue dispensing pipes communicate with a glue dispensing nozzle. According to the invention, glue is pushed and injected through air pressure and moves to the glue dispensing nozzle through the glue dispensing pipes, the glue dispensing nozzle moves out of the supporting sleeve to achieve glue dispensing, after glue dispensing is finished, the glue dispensing column drives the glue dispensing pipe and the glue dispensing nozzle to return to the initial position under driving of the reset mechanism, and at the moment, the transmission mechanism drives the opening and closing mechanism to be closed to achieve the purpose that the glue dispensing nozzle is protected in the supporting sleeve; and the glue dispensing nozzle is protected, direct contact between the glue dispensing nozzle and the surface of a device is reduced, and the phenomenon of glue wire drawing is reduced.

The invention discloses an airplane box folding machine. The airplane box folding machine comprises a bracket structure, a feeding mechanism, a paper feeding mechanism, a conveying mechanism and an edge folding mechanism; the bracket structure comprises a feeding frame and a box folding frame which are perpendicular to each other and a mechanical arm frame arranged over the box folding frame; theheight of the box folding frame is smaller than that of the feeding frame; the feeding mechanism is arranged over the feeding frame; the paper feeding mechanism is arranged over the feeding frame, located over the conveying mechanism and arranged over the middle of the paper outlet end of the feeding mechanism through a portal frame; the paper feeding mechanism comprises a paper feeding air cylinder arranged on the portal frame and a paper feeding pressing head arranged on an output shaft of the paper feeding air cylinder; the conveying mechanism is transversely arranged in the middle of the box folding frame, and one end of the conveying mechanism is connected with the paper feeding mechanism; and the edge folding mechanism is arranged on the mechanical arm frame and used for conducting box folding operation on raw material paper boards on the conveying mechanism. The box folding machine is good in box folding effect and high in efficiency.

The invention discloses a pull bead venetian blind. The pull bead venetian blind comprises a device body, wherein front glass is mounted at the front end of the device body, rear glass is mounted at the rear end of the device body, a positioning support is mounted in the device body, a first winding positioning seat, a second winding positioning seat and an internal transmission device are mounted at the upper end of the positioning support, a first winding reel is installed between the first winding positioning seat and the second winding positioning seat. The pull bead venetian blind is provided with an internal transmission device, an external transmission device and a curtain driving device, the internal transmission device adopts a turbine and worm structure to drive the winding reels to rotate to fold the venetian blind, and the structural characteristic of the pull bead venetian blind has a self-locking function, so that the curtain is prevented from automatically descending due to gravity, stretching failure caused by the weight of the large-area shutter is avoided, a planetary gear structure is adopted in the external transmission device, and stable power transmission and long-term use are fully guaranteed.

The invention discloses a load sensitive control hydraulic system of a pile driver, which comprises a load sensitive multi-way valve, a load sensitive variable pump, a walking motor, a hydraulic hammer, a left oil cylinder, a right oil cylinder, a front oil cylinder, a rear oil cylinder, a variable amplitude oil cylinder, a lifting oil cylinder, a lifting motor, a pilot pump, a pilot valve set and the like, wherein the load sensitive variable pump is connected with the load sensitive multi-way valve; the load sensitive valve controls execution elements such as the walking motor, the hydraulic hammer, the left oil cylinder, the right oil cylinder, the front oil cylinder, the rear oil cylinder, the variable amplitude oil cylinder, the lifting oil cylinder and the lifting motor, and the pilot pump and the pilot valve set control high and low speed switching of the walking motor. The load sensitive control hydraulic system is suitable for the hydraulic system of the road guardrail pile driver, can obviously reduce the power loss of the road guardrail pile driver and improve the work efficiency.

The invention discloses a leather bag slingshot facilitating carrying of marbles. The leather bag slingshot comprises a large circular tube and a latex sleeve and is mainly characterized in that a circular ring is arranged on the periphery of the outer diameter end of the upper portion of the large circular tube, uniformly distributed outer circle concave holes and communicated outer circle through holes are radially formed in the periphery of the outer diameter end of the circular ring, outer circular elastic rubber plates are arranged in the outer circle concave holes, spherical projections with outer cross gaps are arranged at the centers of the outer circular elastic rubber plates, inner circle concave holes and communicated inner circle through holes are formed in the thick portion of the upper inner wall of the large circular tube, the inner circle through holes are communicated with the outer circle through holes, inner circular elastic rubber plates are arranged in the inner circle concave holes, inner cross gaps are formed in the centers of the inner circular elastic rubber plates, and the widths of the outer cross gaps and the inner cross gaps are smaller than the diameters of the marbles. The leather bag slingshot can solve the problem of inconvenience in carrying the marbles, and shooting speed is obviously increased.

The invention discloses a crane hoisting mechanism with an anti-falling type hand-operating device for a nuclear power station. The crane hoisting mechanism comprises an electric motor, a winding drum set, a brake, a brake wheel shaft coupler, a speed reducer and a handle mechanism, wherein a friction sheet I, a friction plate, a fixed plate, a friction plate and a friction sheet II of the handle mechanism are sequentially arranged on the shaft sleeve in a penetrating and sleeving mode; the shaft sleeve is arranged at the front section of a flange shaft sleeve of a flange in the sleeving mode; a central screw hole of the hand wheel is screwed in right-hand threads at the middle section of the flange shaft sleeve; a retainer ring is arranged at the rear section of the flange shaft sleeve of the flange in the penetrating mode; all parts are fixed together by virtue of a disc spring and a nut; springs is arranged between the external circumference of the fixed plate and a fixed flange; and the other end of the fixed flange is fixed on a fixed base through a pin roll. The crane hoisting mechanism has the beneficial effects that the load is prevented from automatically dropping, the structure is simple, the arrangement is convenient, the dismounting is convenient, and the same set of device can be used for multiple hoisting mechanisms.

The invention discloses a chip collection structure of a water conservancy pipeline cutting device, which comprises a chip storage bin, a connecting bracket, a supporting bottom plate, a plate side frame, a chip dropping plate, a shield, a control box, a power cord and an auxiliary chip feeding mechanism, and a chip storage There are connecting brackets on both sides of the bottom of the bin, and a board side frame is provided at both ends of the supporting bottom plate. The bottom of the chip storage bin is fixed with the side frames of the side ends of the supporting bottom plate through the connecting brackets. The front end of the chip storage bin is not integrated structure, the present invention is provided with an auxiliary chip-feeding mechanism at the front end of the chip-feeding plate, and the auxiliary chip-feeding plate is turned over to be parallel to the chip-breaking plate by the rotating mechanism, and at the same time, the angular positioning is performed by the angle positioning mechanism, which increases the area of ​​the chip-falling plate, and at the same time assists The chip drop board can be directly connected with the chip drop port at the bottom of the cutting device, so that the chips can better enter the chip storage bin, and the chip collection efficiency is increased.

The invention discloses traditional Chinese medicine drying equipment capable of automatically flattening. The drying equipment comprises a rack, wherein a lifting mechanism for placing a traditionalChinese medicine is arranged in the middle of the rack, a fixing assembly is arranged in the middle of the lifting mechanism, a tiling mechanism capable of moving left and right is arranged on the upper side in the rack, and a drying mechanism is arranged on the lower side in the rack; a pressure discharge mechanism is arranged at the right end of the rack, a feeding mechanism is arranged at the left end of the rack, a discharging mechanism is arranged at the bottom end of the rack, and a control cavity is formed in the front end of the rack; and a PLC module is arranged in the control cavity,and the fixing assembly and the tiling mechanism is connected with the PLC module through a circuit. The drying equipment has the beneficial effects that the tiling mechanism is used for flattening medicinal materials to be dried in the rack, the contact area between the medicinal materials and the hot air is increased, the drying speed of the medicinal materials is improved, and the practicability of the drying equipment is improved.

The invention provides a thread milling device for a screw. The thread milling device for the screw comprises a machine body, and further comprises a linear drive device, a rotary drive device, a sleeve, a thread milling device and a fixing device which are arranged on the machine body, wherein the fixing device is used for fixing the target screw, the thread milling device is used for cleaning the target screw, the thread milling device is arranged on the inner side of the sleeve, the linear drive device is used for driving one of the fixing device and the sleeve to move in the axial direction so as to enable the fixing device and the thread milling device to perform relative motion, and the rotary drive device is used for the driving at least one of the fixing device and the sleeve to rotate so as to enable the fixing device and the thread milling device to perform relative rotation. The thread milling device for the screw can automatically complete cleaning for the target screw, meanwhile can further collect iron chippings which fall off from the thread milling device in cleaning through the sleeve, and prevents the iron chippings from falling to the ground. Accordingly, the thread milling device for the screw reduces involved manpower, saves time of workers, and reduces time cost.

The invention relates to an automatic tea making machine. The technical problem that an existing tea making machine is unreasonable in design is solved. The tea making machine further comprises: a sealed storage device which is arranged on the machine cabinet and used for storing brewing raw materials; at least one group of discharging mechanisms which are used for quantitatively discharging the brewing raw materials; and a discharging sealing mechanism which is connected to the discharging position of the discharging mechanism and used for controlling the discharging amount and sealing and unsealing the processing position of the discharging mechanism. The automatic tea making machine has the advantages that by means of the design of the sealing plug connector, the sealing requirement can be met, raw materials in the storage tank can be prevented from automatically falling to the ground or other positions in the storage tank assembling process, and the assembling and replacing efficiency is improved.

The invention discloses a scrap collecting structure of a water conservancy pipeline cutting device. The scrap collecting structure comprises a scrap storage bin, connecting supports, a supporting bottom plate, plate edge frames, a scrap falling plate, a blocking cover, a control box, a power line and an auxiliary scrap feeding mechanism. The connecting supports are respectively arranged on the two sides of the bottom of the scrap storage bin. The two ends of the supporting bottom plate are respectively provided with one plate edge frame. The bottom of the scrap storage bin is fixed to the plate edge frame at the side end of the supporting bottom plate through the connecting support. The front end of the scrap storage bin is provided with the scrap falling plate and is not of an integratedstructure. The auxiliary scrap feeding mechanism is arranged at the front end of the scrap falling plate, the auxiliary scrap falling plate is driven by the rotating mechanism to turn over to be parallel to the scrap falling plate, and angle positioning is conducted through the angle positioning mechanism, the area of the scrap falling plate is increased, the auxiliary scrap falling plate can bein direct butting with the scrap falling opening in the bottom of the cutting device, the scraps can better enter the scrap storage bin and the collecting efficiency of the scraps is improved.

The invention relates to the technical field of environment monitoring, and discloses a water quality detection and extraction device capable of removing gravel through rotation, the water quality detection and extraction device comprises a base, the surface of the base is rotatably connected with a rotating wheel, the surface of the rotating wheel is sleeved with a connecting belt, the surface of the rotating wheel is fixedly connected with a rotating shaft, and the surface of the rotating shaft is wound with a water suction pipe; the device comprises a base, the surface of the base is fixedly connected with a stable structure, the stable structure comprises a fixing plate and a roller, the surface of the fixing plate is fixedly connected with a fixing frame, and the interior of the fixing frame is slidably connected with a sliding rod. By arranging the sampling mechanism and the water suction pipe, a device for removing impurities such as pebbles through rotation is formed, so that some pebbles can be prevented from entering the device during sampling, filtering is not needed during later water quality detection, the water quality detection process is shortened, and the water quality detection efficiency is improved; and the functionality and the practicability of the device are improved.

The invention discloses a spinning bracket convenient to move, which comprises a bracket body and a control box, wherein an accommodating cavity is formed in the control box; the control box comprisesa bottom plate; a support is further arranged on the bottom plate; the control box comprises a first side plate and a second side plate which are arranged at two sides of the bottom plate in the width direction; limiting grooves are formed on the surfaces of the first side plate and the second side plate, facing the bracket body; a limiting column is arranged on the bracket body; a lifting mechanism is arranged in the accommodating cavity; the lifting mechanism comprises a rotating rod which is rotatably arranged between the first side plate and the second side plate; a turbine sleeves the rotating rod; the turbine is provided with an abutting rod; the control box is provided with an opening; one end of the abutting rod is fixed on the turbine, and the other end of the abutting rod extends out of the opening and abuts against the bracket body; the lifting mechanism further comprises a worm engaged with the turbine; the control box comprises a third side plate and a fourth side plate on two sides of the bottom plate in the length direction; the third side plate and the fourth side plate are provided with openings through which two ends of the worm pass, and the control box is further provided with a driving mechanism.

The invention provides a suspending device for a bridge detection working vehicle. The suspending device for the bridge detection working vehicle mainly comprises a rear axle steel plate spring suspension device, two or four supporting leveling base, an oil suspension device and a stander assembly; the rear axle steel plate spring suspension device consists of two groups of steel plate springs; each group of steel plate springs is formed by mutually overlapping and fixing a plurality of steel plates with different lengths; each supporting leveling base has a framework structure formed by welding a plurality of steel plates; the oil suspension device comprises a suspension oil cylinder, a supporting foot base, a U-shaped base, a connecting plate, a bidirectional hydraulic lock and a three-position four-way reversing valve; and the stander assembly comprises a chassis vehicle frame and an auxiliary vehicle frame. The steel plate spring suspension and the oil suspension are combined organically, so the suspending device for the bridge detection working vehicle plays a role in buffering and damping during running of the bridge detection working vehicle, and rigidly supporting during working of the bridge detection working vehicle; therefore, the contradiction of buffering and damping during running of the bridge detection working vehicle and rigidly supporting during working of the bridge detection working vehicle can be solved effectively. The suspending device for the bridge detection working vehicle has the characteristics of large bearing capacity, rational fixing position, high stability, low contact stress and high reliability.

The invention relates to an engine demounting and mounting trailer. According to the technical scheme, the trailer is composed of a mounting vehicle, a demounting and mounting platform and a hydraulic system. The mounting vehicle comprises a walking mechanism, two lifting mechanisms, a transverse moving mechanism and a guide rail mechanism. The two lifting mechanisms are installed at the two ends of the walking mechanism respectively and drive the transverse moving mechanism to ascend or descend, and the transverse moving mechanism drives the guide rail mechanism to move. The mounting vehicle and the demounting and mounting platform are movably connected through the guide rail mechanism. The demounting and mounting platform comprises a platform, a longitudinal sliding guide rail, a carriage, a bracket, a main fixing supporting piece, an auxiliary fixing supporting piece, a bearing outrigger, an adjusting pull rod and a traction device. The lifting mechanisms are controlled by the hydraulic system. The trailer is simple in operation, the position of an engine conveying device can be adjusted on the X axis, the Y axis and the Z axis in six directions, forward movement, backward movement, transverse movement, ascent, descent and rolling movement can be achieved, and therefore the requirements for separating and matching of butt joint working faces are met.

The invention relates to a freight yard type full-automatic microhole plate washing works station which comprises a frame, a three-dimensional walking mechanism and a microhole plate washing machine.The three-dimensional walking mechanism is mounted on the frame, the microhole plate washing machine is fixed in the frame, a freight yard for storing microhole plates is formed in the frame, the three-dimensional walking mechanism is erected above the microhole plate washing machine and the freight yard, and the three-dimensional walking mechanism transports the microhole plates stored in the freight yard to the microhole plate washing machine or transports the microhole plates treated by the microhole plate washing machine back to the freight yard. The piled microhole plates to be treated onthe freight yard are transported to the microhole plate washing machine pile by pile through the three-dimensional walking mechanism, the microhole plates are treated through the microhole plate washing machine, after treatment, the three-dimensional walking mechanism transports the microhole plates back to the original position in the freight yard, artificial participation is not needed any morein the whole process, intelligence and mechanization are really achieved, and work efficiency is greatly improved.

The invention relates to a small cart for cargo transfer. The small cart comprises an outer frame body, side blocks, a sliding frame, a hollow sliding shaft, a bearing plate, a connecting block, a support, a clamping rod, a moving mechanism, a transmission mechanism and a driving mechanism, the lower portions of the left side and the right side of the outer frame body are each connected with the two side blocks, the sliding frame is slidably connected to the front side face of the outer frame body, and the hollow sliding shaft is connected to the bottom of the sliding frame; and two bearing plates are slidably connected in the hollow sliding shaft in a bilateral symmetry manner, are in sliding fit with the outer frame body, and are used for supporting goods. The two bearing plates can get close to each other through the transmission mechanism to support goods, the goods can be conveniently and rapidly transferred to the front side of a boxcar through the moving mechanism, the bearing plates can be driven by the driving mechanism to lift the goods, and therefore the effects that loading and unloading can be facilitated, and manpower can be saved are achieved.

The invention relates to a micropore plate washing machine. The micropore plate washing machine comprises a rack, a micropore plate moving device and a micropore plate treatment device; the microporeplate moving device comprises a first device, a second device, a moving tray and a transfer plate moving device corresponding to the micropore plate treatment device, the first device and the second device are arranged on the upper side of the rack and used for stacking and storing micropore plates, the moving tray can be movably arranged between the first device and the second device and used fortransferring the micropore plates between the first device and the second device, and the transferring plate moving device is arranged on the rack and used for conveying the micropore plates betweenthe moving tray and the micropore plate treatment device. The machine is good in seal, the surface is quite easily cleaned, even if liquid is leaked, the liquid cannot be leaked to the machine, the transmission device cannot be damaged, and the reliability of the plate washing machine is greatly improved.

The invention discloses a self-cleaning dustproof net with a high-temperature reminding function, and belongs to the field of computer auxiliary equipment. The self-cleaning dustproof net is characterized in that when the temperature of a computer is too high, a counterweight iron ball is pushed to fall off by utilizing the heating expansion property of a heated hemisphere, so that the dust removal and high-temperature reminding functions of the dustproof net are triggered; in the falling process of the counterweight iron ball, the sound making sheet is impacted by the counterweight iron ball to give out a prompt sound so as to remind people that the computer is in the high-temperature state, and after the counterweight iron ball falls into the first cleaning groove, the proportion of the first cleaning groove to the second cleaning groove is changed, so that the first cleaning groove and the second cleaning groove move up and down under the action of the connecting rope; therefore, the purpose of cleaning dust is achieved, computer high temperature caused by the fact that the dust screen is blocked by the dust is avoided, then under assistance of the magnet block, the counterweight iron ball falls off, the first cleaning groove and the second cleaning groove restore the initial specific gravity, the first cleaning groove and the second cleaning groove move and reset, and secondary cleaning is conducted on the dust screen.

The invention belongs to the technical field of engineering construction, and particularly relates to a movable cantilever device for civil engineering construction, which comprises a bottom plate, a case is arranged in the middle of the upper end of the bottom plate, a plurality of support rods I are arranged on the periphery of the bottom of the case, and a positive and negative motor is fixed at the inner upper end of the case. A transmission shaft is arranged at the output end of the forward and reverse motor, a main belt wheel is fixed to the bottom end of the transmission shaft, a plurality of belts are connected to the main belt wheel in a sleeving mode, side plates are fixed to the two sides of the upper end of the bottom plate, an ejector rod is fixed to one side of the upper end of each side plate, and screw rods are arranged on the two sides of the bottom end of each ejector rod; the upper end and the lower end of the screw rod are rotationally connected with the top rod and the bottom plate through rotating shafts correspondingly, auxiliary belt wheels are fixed to the periphery of the outer portion of the bottom end of the screw rod, and the auxiliary belt wheels are in transmission connection with the main belt wheels through belts, bearing and descending are easy and convenient, supporting is stable and firm, using is safe and convenient, the overall using effect is good, and construction and using are convenient.