35results about How to "Easy to control the center of gravity" patented technology

The invention discloses an energy-saving fan unit which comprises a bottom plate, a lifting and falling device, guiding connection devices and a retracting device. Downward-opening bolt connection slots are arranged in the bottom of the bottom plate, a bolt joint pin is fittingly mounted in each bolt connection slot, the lifting and falling device is fixed on the upper end face of the bottom plate and is used for lifting and falling the unit vertically, the retracting device is mounted at the top of the lifting and falling device and is used for a signal lamp of the unit to retract in the horizontal plane, and the guiding connection devices are mounted on two sides of the lower end face of the retracting device and extend to two sides of the lifting and falling device and are used for guiding connection of the unit in lifting and falling. The energy-saving fan unit is simple in structure and convenient in operation, a fan is lifted and retracted, blowing blind areas can be prevented, and convenient transportation of the energy-saving fan unit small in size can be achieved.

The invention discloses an LED lamp device, which comprises a bottom bracket, a lifting device, a guide device and a telescopic device, the bottom of the bottom bracket is provided with a slot hole with the port facing downward, and a balance weight is detachably installed in the slot hole , the lifting device is fixed on the upper end surface of the bottom bracket, and is used for the lifting and lowering of the device in the up and down direction, and the telescopic device is installed on the top of the lifting device, and the LED light used for the device is Telescopic in the horizontal plane, the guide device is installed on both sides of the lower end surface of the telescopic device and extends downward to both sides of the landing device, and is used for guiding and moving the device when it is lifted and lowered. The structure of the present invention is simple , easy to operate, the LED lights can be raised and retracted, which can not only prevent blind spots in the light, but also can be smaller in size for easy transportation.

The invention discloses a paddy field leveling device with a spherical hinge connecting and hydraulic cylinder forming link mechanism. The device can achieve four-freedom moving of a scraper, namely scraper lifting, scraper swinging, scraper horizontal swinging and scraper angle converting, and scraper leveling various tasks are completed. The device comprises a connecting plate, a machine frame, a swinging frame, a Y-shaped base, a scraper left-right lifting hydraulic cylinder, a swinging hydraulic cylinder, a dragging frame, an angle converting hydraulic cylinder and a spherical hinge mechanism. A spherical hinge is arranged at the front end of the dragging frame. The spherical hinge and a ball face bearing base on the connecting plate form a spherical hinge mechanism, and spherical hinge type connecting of the dragging frame is formed. The machine frame is welded with the connecting plate and the swinging frame, and the Y-shaped base is hinged to the swinging frame. Ear shafts of the scraper left-right lifting hydraulic cylinder and the swinging hydraulic cylinder are hinged to the Y-shaped base. A piston rod ear ring is connected with the spherical hinge on the dragging frame, and the space link mechanism is formed with the dragging frame. An external hydraulic power source drives and controls the hydraulic cylinders to move. A scraper angle converting hydraulic cylinder tail ear ring is hinged to two side wing plates on the dragging frame, and an ear ring at the other end is hinged to an angle position machine. The back of the scraper is welded with a supporting plate. The scraper angel position machine is fixed on the supporting plate.

The invention discloses a lifting type intelligent traffic flow guidance device. The lifting type intelligent traffic flow guidance device comprises a base, a lifting device, a guiding device and a telescopic device, wherein the lifting device is fixed to the upper surface of the base, and is used for lifting of the traffic flow guidance device in the up-down direction; the telescopic device is mounted at the top end of the lifting device, and is used for extension and retraction of signal lamps of the traffic flow guidance device in the horizontal plane; and the guiding device is mounted on the two sides of the lower surface of the telescopic device and downwards extends to the two sides of the lifting device, and is used for guiding of the traffic flow guidance device during lifting. According to the lifting type intelligent traffic flow guidance device, the structure is simple, operation is convenient, lifting of the traffic flow guidance device and extension and retraction of signal lamp mounting plates can be automatically achieved, signal blind areas can be avoided, the size is small, and transportation is convenient.

The invention discloses a convenient lifting type intelligent traffic diversion device, which comprises a base, a lifting device, a guide device and a telescopic device, the lifting device is fixed on the upper surface of the base, and is used for the traffic diversion device For lifting in the up and down direction, the telescopic device is installed on the top of the lifting device, and is used for the expansion and contraction of the signal lights of the traffic diversion device in the horizontal plane, and the guiding device is installed on both sides of the lower surface of the telescopic device and It extends down to both sides of the lifting device, and is used for guiding the traffic flow guiding device when it is lifted. There is a signal blind area, and it can be smaller in size for easy transportation.

The invention discloses a conveniently used bridge equipment, which comprises an underframe, a lifting device, a guiding device and a shrinking device. Universal wheels are provided, and the lifting device is fixed on the upper end surface of the chassis for the lifting and landing of the device in the up and down direction, and the shrinking device is installed on the top of the lifting device for The signboard of the device shrinks in the horizontal plane, and the guide device is installed on both sides of the lower end surface of the shrinking device and extends downward to both sides of the lifting device, which is used to lift the device For the guide position when lowering, the present invention has simple structure and convenient operation, and can automatically raise and shrink the signboard, which can prevent the occurrence of signal blind spots, and can be smaller in size for easy transportation.

The sports bicycle capable of being used as scooter has a front wheel, a back wheel, a connection mechanism, steering mechanism on the front wheel and driving mechanism on the back wheel. It features that the driving mechanism includes support comprising straight rod with locating hole and cross beam and connected to the fork of the steering mechanism, spring on the support, pedal unit with locating pin matching the locating hole, and gear meshed to the inner teeth in wheel ring. The present invention integrates the functions of both scooter and bicycle, may be used as walking tool and for recreation and body building, and is especially suitable for amateur of extreme sports.

The invention discloses an improved pipe clamping device for an industrial robot. The clamping device comprises a joint which is connected with a mechanical arm of the industrial robot, a seat body, acover plate which is fixedly arranged at the left end of the seat body and extends rightwards into the second cavity, two groups of connecting rod groups, a driving air cylinder, two U-shaped mechanical grippers, a stop iron component which is installed on the upper surface of the part, on the right side of the long and narrow through groove, of the seat body and two V-shaped block which are fixed on the left side face of the cover plate; and the seat body is fixed at the left end of the joint and is provided with a second cavity with a leftward opening, a rectangular groove is formed in theupper surface of the seat body, and a long and narrow through groove is formed in the position, right below the rectangular groove and on the right side of the second cavity, of the seat body, and a rectangular hole in the vertical direction is formed in the position, in the middle of the rectangular groove, of the seat body. According to the device, the pneumatic control mode is adopted, the operation is convenient and fast, the mechanical grippers can be closed and tightly locked by adopting one air cylinder, so that the manufacturing cost is reduced, and meanwhile, clamping is safe and reliable.

The invention relates to the field of pure electric vehicles, and in particular relates to an electric driving system and an electric vehicle. The electric driving system comprises a first motor, a second motor and a speed change mechanism. The speed change mechanism comprises a differential mechanism, a gear shifting mechanism and a planetary speed reducing mechanism. A first motor shaft of the first motor is connected with a sun gear of the planetary speed reducing mechanism, and a front gear ring of the planetary speed reducing mechanism is connected with the input end of the differential mechanism. A second motor shaft of the second motor is connected with the input end of the differential mechanism through the gear shifting mechanism; the two output ends of the differential mechanismdrive wheels to rotate through a left half shaft and a right half shaft respectively. A planet carrier of the planetary speed reducing mechanism is provided with a locking clutch so as to achieve locking and unlocking of the planet carrier. When the electric driving system is used on the vehicle, the requirement for motor power is low, cost is reduced, one motor can provide torque compensation forthe other motor during gear shifting, and power interruption is avoided; and the switching of working modes can be realized through the locking clutch.

The invention discloses a new-energy automobile charging pile convenient to use. The new-energy automobile charging pile convenient to use comprises a carrying frame, an up-and-down adjustment device,guide devices and a stretching and retracting device. Multiple up-and-down run-through penetrating holes are formed in the carrying frame. The up-and-down adjustment device is fixed to the upper endface of the carrying frame and used for conducting up-and-down adjustment on the new-energy automobile charging pile in the up and down direction. The stretching and retracting device is installed atthe top end of the up-and-down adjustment device and used for stretching and retracting a charging pile body of the new-energy automobile charging pile in the horizontal plane. The guide devices are installed on the two sides of the lower end face of the stretching and retracting device, extend downwards to the two sides of the up-and-down adjustment device and are used for guiding the new-energyautomobile charging pile in the up-and-down adjustment process. The new-energy automobile charging pile convenient to use is simple in structure, convenient and quick to operate, capable of automatically lifting, stretching and retracting the charging pile body and convenient to use.

The invention discloses a rising-falling type LED lamp device. The rising-falling type LED lamp device comprises a bottom support, a rising-falling device, guiding-moving devices and a telescopic device, wherein a slot hole with a downward port is formed in the bottom of the bottom support; a balance block is detachably mounted in the slot hole; the rising-falling device is fixedly arranged on theupper end surface of the bottom support, and is used for rising and falling the device up and down; the telescopic device is mounted at the top end of the rising-falling device and is used for stretching out and drawing back an LED lamp of the device in the horizontal plane; and the guiding-moving devices are mounted at the two sides of the lower end surface of the telescopic device, and downwards stretch to the two sides of the rising-falling device for guiding and moving the device during rising and falling. The rising-falling type LED lamp device is simple in structure, is convenient to operate, ascends and shrinks the LED lamp, can prevent an illumination dead zone, and also can be convenient for transportation with a relatively small size.

The invention discloses an improved lifting type intelligent traffic flow guide device. The device comprises a base, a lifting device, guide devices and a telescopic device. The lifting device is fixed to the upper surface of the base and used for lifting the traffic flow guide device up and down, the telescopic device is mounted at the top of the lifting device and used for stretching of a signallamp of the traffic flow guide device in the horizontal plane, and the guide devices are mounted on two sides of the lower surface of the telescopic device, extend downward to two sides of the lifting device, and are used for guiding the traffic flow guide device in lifting. The improved lifting type intelligent traffic flow guide device is simple in structure and convenient to operate, the traffic flow guide device can rise automatically, and signal mounting plates can be stretched automatically; the traffic flow guide device can prevent signal blind areas and can be convenient to transportwith relatively small size.

The invention discloses a letter box device. The letter box device comprises a connecting arm, a frame body, a baffle, two connection column groups, a driving machine, two clamping claws, an iron sheltering device and two fixing arms, wherein the connecting arm is connected with a carrier; the frame body is fixed to the left end of the connecting arm, a second hole with the opening end towards left is formed in the frame body, the upper surface of the frame body is provided with a strip-like cavity, a first through hole is formed in right side of the position, below the strip-like cavity, of the second hole, and a vertical second through hole is formed in the portion, in the middle of the strip-like cavity, of the frame body; the baffle is fixedly installed at the left end of the frame body and penetrates rightwards into the second hole; the iron sheltering device is installed on the upper surface of the portion, on the right side of the first through hole, of the frame body; the two fixing arms are fixed to the left side face of the baffle. The letter box device is controlled by air pressure, the operation is convenient, the opening and locking of the clamping claws can be achieved by using one driving machine, the manufacturing cost is reduced, and meanwhile, clamping is safe and reliable.

The sports bicycle capable of being used as scooter has a front wheel, a back wheel, a connection mechanism, steering mechanism on the front wheel and driving mechanism on the back wheel. It features that the driving mechanism includes support comprising straight rod with locating hole and cross beam and connected to the fork of the steering mechanism, spring on the support, pedal unit with locating pin matching the locating hole, and gear meshed to the inner teeth in wheel ring. The present invention integrates the functions of both scooter and bicycle, may be used as walking tool and for recreation and body building, and is especially suitable for amateur of extreme sports.

The invention discloses a novel industrial robot pipe fitting clamping device. The novel industrial robot pipe fitting clamping device comprises a connector connected with a mechanical arm of an industrial robot, a base, a cover plate which is fixedly arranged at the left end of the base and rightwards stretches into a second cavity, two connecting rod sets, a drive air cylinder, two U-shaped mechanical claws, a stop iron assembly arranged on the part, on the right side of a narrow and long through groove, of the upper surface of the base, and two V-shaped blocks fixed to the left side face ofthe cover plate, wherein the base is fixed to the left end of the connector and provided with the second cavity with a leftward opening, the upper surface of the base is provided with a rectangular groove, the part, located under the rectangular groove and on the right side of the second cavity, of the base is provided with the narrow and long through groove. The part, at the middle portion of the rectangular groove, of the base is provided with a rectangular hole in the up-down direction. Air pressure control is adopted in the device, operation is convenient and fast, mechanical claw closingand locking can be achieved by adopting one air cylinder, the manufacturing cost is reduced, and meanwhile clamping is safe and reliable.

The invention discloses a lifting type intelligent traffic flow guidance device. The lifting type intelligent traffic flow guidance device comprises a base, a lifting device, a guiding device and a telescopic device, wherein the lifting device is fixed to the upper surface of the base, and is used for lifting of the traffic flow guidance device in the up-down direction; the telescopic device is mounted at the top end of the lifting device, and is used for extension and retraction of signal lamps of the traffic flow guidance device in the horizontal plane; and the guiding device is mounted on the two sides of the lower surface of the telescopic device and downwards extends to the two sides of the lifting device, and is used for guiding of the traffic flow guidance device during lifting. According to the lifting type intelligent traffic flow guidance device, the structure is simple, operation is convenient, lifting of the traffic flow guidance device and extension and retraction of signal lamp mounting plates can be automatically achieved, signal blind areas can be avoided, the size is small, and transportation is convenient.

The invention relates to a portable shopping trolley. A first upper pull rod and a second pull rod of the portable shopping trolley are respectively sheathed and overlapped in a first middle pull rod and a second middle pull rod; the first middle pull rod and the second middle pull rod are respectively sheathed and overlapped in a first lower pull rod and a second lower pull rod; the transverse part of the second upper pull rod is sheathed and overlapped in the transverse part of the first upper pull rod, and the transverse part of the second lower pull rod is sheathed and overlapped in the transverse part of the first lower pull rod; rollers are fixed on the transverse part of the first lower pull rod; the longitudinal parts of the first lower pull rod and the second lower pull rod are connected with a first supporting plate and a second supporting plate, and the first supporting plate is in a sandwich structure; a third supporting plate is arranged below the first supporting plate; the side of the third supporting plate is provided with a forth supporting plate; the first supporting plate and the third supporting plate as well as the third supporting plate and the forth supporting plate are connected by hinges. The portable shopping trolley has the advantages of convenient carrying, easy control of the gravity center of the whole trolley and stable running.

The invention discloses a safe power cable device. The device comprises a chuck connected with a conveyor, and a second air port which is fixed at the left end of the chuck and provided with an opening part towards the left, and a base with a positive edge groove formed in the upper surface and a first through opening formed in the right side of the second air opening below the positive edge groove; and a second through opening in the up-down direction, a plate piece which is fixedly arranged at the left end of the base and extends rightwards into the second air opening, two sets of connectingframe sets, a hydraulic cylinder, two clamping jaws, an electromagnetic device installed on the upper surface of the base on the right side of the first through opening, and two fixing blocks which are fixed on the left side face of the plate piece are arranged on the base and in the middle of the positive edge groove. According to the device, hydraulic control is adopted, the operation is convenient, and the clamping jaws can be closed and locked by adopting a hydraulic cylinder, so that the manufacturing cost is reduced; and meanwhile, the clamping is safe and reliable.

The invention discloses a new type of water cup device, which includes a connecting block connected with a moving machine, and a second leftward slot fixed on the left end of the connecting block and provided with a slot on the upper surface and a strip-shaped cavity on the upper surface. The frame body of the first cavity is arranged on the right side of the second cavity below the strip cavity, and the frame body in the middle of the strip cavity is provided with a second cavity in the up and down direction, and a frame fixed on the The left end of the frame body pushes into the second empty groove to the right, and two sets of connecting strips, and a driving machine, and two grasping claws, and the one installed on the right side of the first cavity. The sear device on the upper surface of the frame body, and two fixing plates fixed on the left side of the retaining bar. The device adopts air pressure control, and is easy to operate. The closing and locking of the grasping claw can be realized by using one driving machine, which reduces the manufacturing cost, and at the same time, the clamping is safe and reliable.

The invention discloses a power cable device, which comprises a chuck connected to a conveyor, and a chuck fixed on the left end of the chuck and provided with a second opening to the left of the mouth, a front groove on the upper surface and the The right side of the second opening below the front side groove is provided with a base for the first opening, the base in the middle of the front side groove is provided with a second opening in the up and down direction, and a base fixed on the base The left end of the seat and the plate extending rightward into the second opening, two sets of connecting frames, one hydraulic cylinder, two clamping claws, and the upper surface of the base installed on the right side of the first opening An electromagnetic device, and two fixed blocks fixed on the left side of the plate. The device adopts hydraulic control, and is easy to operate. A hydraulic cylinder can be used to realize the closing and locking of the clamping claw, which reduces the manufacturing cost, and at the same time, the clamping is safe and reliable.

The invention discloses a novel sewage treatment device which comprises a connecting column connected with a carrying cart, a second hollow cavity, a frame, a cover body, two sets of chain components,an air compressor, two clamping claws, a shielding device and two fixing heads, wherein the second hollow cavity is fixed to the left end of the connecting column and provided with a leftward cavityopening, the upper surface of the frame is provided with a long groove, a first passing groove is formed in the position, on the right side of the second hollow cavity below the long groove, of the frame, and a second passing groove in the up-down direction is formed in the position, in the middle of the long groove, of the frame; and the cover body is fixedly mounted at the left end of the frameand rightwards jacks the second hollow cavity, the shielding device is mounted in the position, on the right side of the first passing groove, of the upper surface of the frame, and the fixing heads are fixed to the left side face of the cover body. According to the novel sewage treatment device, air pressure control is adopted, operation is convenient and fast, closing and locking connecting of the clamping claws can be achieved through one air compressor, the manufacturing cost is reduced, and meanwhile, clamping is safe and reliable.

The invention discloses a pipe clamping device for an industrial robot. The pipe clamping device comprises a connector, a second cavity, a base body, a vertical rectangular hole, a cover plate, two connecting rod sets, a driving cylinder, two U-shaped mechanical paws, an iron blocking assembly and two V-shaped blocks, wherein the connector is connected with a mechanical arm of the industrial robot; the second cavity is fixed to the left end of the connector and provided with a leftward opening; the upper surface of the base body is provided with a rectangular groove, and a long and narrow slot is formed in the position, under the rectangular groove and on the right side of the second cavity, of the base body; the rectangular hole is formed in the position, located in the middle of the rectangular groove, of the base body; the cover plate is fixedly mounted at the left end of the base body and extends rightwards into the second cavity; the iron blocking assembly is mounted on the upper surface of the base body and located on the right side of the long and narrow slot; the two V-shaped blocks are fixed to the left side face of the cover plate. The pipe clamping device adopts pneumatic control, is convenient to operate, can realize closing and locking of the mechanical paws by using one cylinder, reduces the manufacturing cost and is safe and reliable in clamping.

The invention discloses a bridge construction device comprising a clamping head, a base frame, a covering plate, two link mechanisms, a drive machine, two clamping and fixing claws, an iron attraction device and two fixed pieces. The clamping head is connected with a transport vehicle. The base frame is fixed to the left end of the clamping head and comprises a second empty cavity with a leftward port. A long strip groove is formed in the upper surface of the base frame. A first through cavity is formed in the portion, below the long strip groove, on the right side of the second empty cavity. A second through cavity in the vertical direction is formed in the portion, on the middle portion of the long strip groove, on the base frame. The covering plate is fixedly installed at the left end of the base frame and penetrates the second empty cavity rightwards. The iron attraction device is installed on the portion, on the right side of the first through cavity, on the upper surface of the base frame. The fixed pieces are fixed to the left side face of the covering plate. Pneumatic control is adopted for the device, operation is convenient and rapid, closing and locking of the clamping and fixing claws can be achieved through one drive machine, the manufacture cost is reduced, and meanwhile clamping is safe and reliable.

The invention discloses a sewage treatment device. The sewage treatment device comprises a connecting column connected to a carrier loader, a frame, a cove body, two linking strip members, an aerostatic press, two clamping hands, a blocking device and fixed heads, wherein the frame is fixed on the left end of the connecting column and is provided with a second hollow cavity with a leftward opening, an elongated slot is formed in the surface, and a first through slot is formed in the right side of the second hollow cavity below the elongated slot; a second through slot is formed in the up-down direction of the frame in the middle of the elongated slot; the cover body is fixedly mounted on the left end of the frame and jacks the second hollow cavity rightward; the blocking device is mounted on the upper surface of the frame on the right side of the first through slot, and the fixed heads are fixed on the left side face of the cover body. The sewage treatment device is controlled by an air pressure and is convenient to operate. The clamping hands are closed and linked by the aerostatic press, so that the manufacturing cost is lowered, and meanwhile, the sewage treatment device is safe and reliable to clamp.

The invention discloses a sewage treatment device. The sewage treatment device comprises a connecting column connected to a carrier loader, a frame, a cove body, two linking strip members, an aerostatic press, two clamping hands, a blocking device and fixed heads, wherein the frame is fixed on the left end of the connecting column and is provided with a second hollow cavity with a leftward opening, an elongated slot is formed in the surface, and a first through slot is formed in the right side of the second hollow cavity below the elongated slot; a second through slot is formed in the up-down direction of the frame in the middle of the elongated slot; the cover body is fixedly mounted on the left end of the frame and jacks the second hollow cavity rightward; the blocking device is mounted on the upper surface of the frame on the right side of the first through slot, and the fixed heads are fixed on the left side face of the cover body. The sewage treatment device is controlled by an air pressure and is convenient to operate. The clamping hands are closed and linked by the aerostatic press, so that the manufacturing cost is lowered, and meanwhile, the sewage treatment device is safe and reliable to clamp.

The invention discloses an improved letter box device. The improved letter box device comprises a connection arm, a frame body, a baffle, two sets of connection columns, a driving machine, two clamping claws, an iron shielding device and two fixing arms, wherein the connection arm is connected with a conveyor; the frame body is fixed to the left end of the connection arm and provided with a secondhole with a leftward opening end, the upper surface of the frame body is provided with a strip-shaped cavity, the right side of the part, below the strip-shaped cavity, of the second hole is providedwith a first via hole, and the part, on the middle portion of the strip-shaped cavity, of the frame body is provided with a second via hole in the vertical direction; the baffle is fixedly arranged at the left end of the frame body and rightwards penetrates the second hole; the iron shielding device is installed on the upper surface of the part, on the right side of the first via hole, of the frame body; and the fixing arms are fixedly arranged on the left side face of the baffle. The improved letter box device is controlled through air pressure, operation is convenient, closing and locking of the clamping claws can be achieved through the driving machine, the manufacturing cost is reduced, and meanwhile clamping is safe and reliable.

The invention provides a pen for preventing a pen point from being broken during falling off and relates to the field of stationery. The pen for preventing the pen point from being broken during falling off comprises a drop-proof pen tube, wherein one end of the drop-proof pen tube is in threaded connection with a connecting block, the pen point is fixedly installed on the connecting block, an inkbag is fixedly installed on the connecting block, the ink bag communicates with the pen point, the ink bag is positioned inside the drop-proof pen tube, a drop-proof ball ring is fixedly connected tothe inner wall of the drop-proof pen tube, the side section view of the drop-proof ball ring is triangular, and the upper surface of the drop-proof ball ring is inclined. According to the pen, the gravity center of the pen can be flexibly controlled through a movable drop-proof magnetic weight-increasing ball, and the weights of the two ends of the pen can be freely changed when the pen is conveniently operated, so that the problems that the weight of the part, close to the front end of the pen point, of a common pen is large, the pen point is prone to landing when the pen falls off, the penpoint is likely to be broken or damaged to other degrees, and the normal use of the pen is directly affected are effectively solved.

The invention discloses a novel sewage treatment device which comprises a connecting pillar connected with a carrying cart, a frame, a cover body fixedly installed at the left end of the frame and rightwards ejecting the second hollow cavity, two sets of chain assemblies, an air compressor, two clamping hands, a shielding device installed on the upper surface of the part, on the right side of thefirst through groove, of the frame, and two fixing heads fixed to the left side face of the cover body. The frame is fixed to the left end of the connecting pillar and provided with a second hollow cavity with a leftward cavity opening, a long groove is formed in the upper surface of the frame, and a first through groove is formed in the position, below the long groove, of the right side of the second hollow cavity. A second through groove in the vertical direction is formed in the position, in the middle portion of the long groove, of the frame. By means of the novel sewage treatment device,air pressure control is adopted, operation is convenient, closing and locking connecting of the clamping hands can be achieved by adopting one air compressor, the manufacturing cost is reduced, and meanwhile clamping is safe and reliable.

The invention discloses a novel letter box device. The novel letter box device comprises a connecting arm connected with a carrying machine, a support, a baffle, two connecting column sets, a drivingmachine, two clamping claws, an iron shading device and two fixing arms; the support is fixed to the left end of the connecting arm and provided with a second hole with a leftward opening end, the upper surface of the support is provided with a strip-shaped cavity, and a first via hole is formed in the position, below the strip-shaped cavity, of the right side of the second hole of the support, asecond via hole in the up-down direction is formed in the position, at the middle portion of the strip-shaped cavity, of the support body, the baffle is fixedly installed at the left end of the support body and rightwards penetrates the second hole, the iron shading device is installed at the position, on the right side of the first via hole, of the upper surface of the support body, and the fixing arms are fixed to the left side face of the baffle. By means of the novel letter box device, air pressure control is adopted, operation is convenient and rapid, one driving machine is adopted so that closing and locking of the grabbing claws can be achieved, and the manufacturing cost is reduced; and meanwhile, clamping is safe and reliable.