50results about How to "Effectively stuck" patented technology

The invention discloses an electrical control EGR valve for reducing working temperature and improving working reliability. A diesel engine electrical control EGR technique is one of main techniques for eliminating discharge pollution. For an electrical control EGR structure, a fin structure is adopted to reduce the working temperature of an executing mechanism by enlarging the radiating area of a cold-end air inlet pipe; a cylindrical isolation cover is arranged on a butterfly valve transmission rod and is used for isolating convection and radiating heat transfer of high-temperature air inflow to the driving executing mechanism; an inlet / outlet hole is formed on a dustproof cover of a transmission mechanism to take heat of a transmission component away by utilizing natural convection so as to reduce the working temperature thereof; a metal scraper ring outside a transmission rod scraps carbon deposition attached to a centered transmission shaft so as to protect transmission centering reliability and the linear contact of the surface of a spherical valve and a valve body, and the peripheral contact of the valve rod and the valve body is ensured under eccentric and deflective states so as to realize sealing; and good seal is simultaneously realized under the conditions of oil dirt, carbon deposition and the like on the valve. The structure has the advantages of reducing the electrical control EGR working temperature and improving the working reliability.

The invention discloses a pipe packing machine which comprises a rack, an automatic feeding device, magnetic isolating type film penetrating devices, film clamping devices, compressing devices and sealing devices. Driving supporting wheels used for supporting and limiting pipes and driving packing films on the pipes to move backwards and locating devices used for locating the rear ends of the pipes are arranged on the rack. The magnetic isolating type film penetrating devices are arranged at the front end of the rack and used for opening the packing films, sleeving the front ends of the pipes with the packing films and locating the front ends of the pipes. The film clamping devices slide in the front-back direction of the rack and used for clamping the packing films opened by the magnetic isolating type film penetrating devices and sleeving the rear ends of the pipes with the packing films from the front ends of the pipes. The compressing devices are suspended above the rack and used for compressing the pipes downwards. The sealing devices are suspended above the rack and located at the front end and the rear end of the rack respectively, and the sealing devices are used for carrying out edge cutting and sealing on the packing films. The pipe packing machine can complete the motion of sleeving the pipes with the packing films automatically, stably and effectively, and the films can be prevented from falling off.

The invention discloses an anti-floating dense construction method of a hollow floor slab and a thin-wall square box used in the same, wherein the middle part of the thin-wall square box is provided with a through hole which run through the upper part and the lower part, and the through hole is sealed and isolated from the inner space of the closed box body; during construction, a bottom rib is pulled and installed on the support member below the framework, then the thin-wall square box is placed, and the bottom of the thin-wall square box and the bottom rib are pulled and combined; a plurality of pulling wires shaped like a Chinese character 'Ji' are arranged between the connecting line of the central axes of adjacent thin-wall square boxes, the middle submerging part of the pulling wireshaped like the Chinese character 'Ji' are pulled and fastened on the bottom rib, and a surface rib is bonded, the concrete are poured for two times, a vibrating rod is used for vibrating and compacting through the gap between adjacent thin-wall square boxes and through hole in the middle of the thin-wall square box every time of casting. According to the invention, the anti-floating effect of thethin-wall square box is ensured, the lateral sliding of the thin-wall square box can be effectively prevented, the concrete at the bottom of the box body is more compact, and the quality of the floorstructure can be ensured while the steel and the installation time are greatly saved.

The invention provides an elevator emergency system. The elevator emergency system is characterized in that the elevator emergency system comprises an elevator emergency intercom system and an elevator emergency rescue system, the elevator emergency intercom system is connected with the elevator emergency rescue system through a single switch, and switching-on and switching-off of the elevator emergency rescue system are controlled; the elevator emergency intercom system comprises a car intercom switchboard, a duty room intercom switchboard, a machine room terminal, a car top terminal and a car bottom terminal, and the car intercom switchboard is integrated in a signal-distortion-prevention system; the signal-distortion-prevention system comprises a COP TFT multimedia platform which is provided with multiple peripheral interfaces, and the COP TFT multimedia platform is integrated with a single conversion device and a communication protocol. According to the elevator emergency system, the elevator emergency intercom system and the elevator emergency rescue system are included, when emergency warning or intercom is achieved, the elevator emergency rescue system can be started, emergency rescue can be executed, and the personal safety of passengers is further guaranteed.

The invention discloses a lamp ring assembly which comprises a bucket-shaped transparent piece and a lamp ring. An annular lug boss which is close to an opening end is arranged at the outer wall of the transparent piece; the lamp ring is sleeved on the lug boss; an annular groove is arranged inside the lamp ring; and a clamping spring with a changeable radius of curvature is clamped in the groove. The invention also discloses a lamp adopting the lamp ring assembly. The annular lug boss which is close to the opening end is arranged at the outer wall of the transparent piece, the lamp ring is sleeved on the lug boss, the clamping spring with changeable radius of curvature is arranged in the annular groove inside the lamp ring, therefore, the clamping spring not only can be prevented from dropping off efficiently, but also can be used for clamping the annular lug boss efficiently, so that the transparent piece and the lamp ring can be efficiently and tightly connected together simply.

The invention relates to the technical field of parking intelligent management, particularly discloses an intelligent parking lock and a parking management method. The intelligent parking lock comprises a base and locking arms. At least two side ends of the base are provided with the locking arms. The locking arms are rotatably connected to a side end of the base, and are used for blocking the base of a vehicle to lock the vehicle. A stepping motor and a controller are arranged inside the base, wherein an input end of the stepping motor is connected with the controller and an output end of the stepping motor is connected with at least two clutch drive boxes. Each clutch drive box is connected with one locking arm, and each locking arm is provided with a rising spring. The inner part of the base is also provided with a bluetooth sensor, an infrared sensor and a wireless communication unit which are respectively connected with the controller. The invention further provides the corresponding parking management method which is simple and quick to operate, and the method can greatly improve the utilization rate of parking spaces and solves the contradictions and problems of parking difficulty and idle parking spaces, and also solves the social contradictions and problems caused by social vehicles parking disorderly at private parking spaces.

The invention discloses a fabricated buttress structure for anti-vibration bridge construction and with convenient pouring. The fabricated buttress structure for the anti-vibration bridge constructionand with convenient pouring comprises a concrete base, a connecting cap beam and fixing joists, metal supporting rods are connected to the upper part of the concrete base, the connecting cap beam isfixedly connected to the upper parts of the metal supporting rods, and the fixing joists are fixed to the upper part of the connecting cap beam. Fastening sleeves are connected to the surface of the metal supporting rods, limiting rods are connected to the fastening sleeves, limiting pieces are connected between the limiting rods, sliding grooves are formed in the inner sides of the limiting rods,fabricated plates are connected to the outer sides of the metal supporting rods, through holes are formed in the surfaces of the fabricated plates, and internal supporting rods are connected to the inner sides of the fastening sleeves. According to the fabricated buttress structure for the anti-vibration bridge construction and with convenient pouring, buttresses can be conveniently fabricated and poured, the convenience of concrete pouring is improved, meanwhile, the fabrication id good, the stability is high, and the air drying speed of fabricated concrete can be accelerated.

The invention relates to the technical field of new energy, and discloses a solar photovoltaic panel with convenience in adjustment. The solar photovoltaic panel comprises a mounting seat. Screw holesare formed in two sides of the top of the mounting seat, tightening screws are penetratingly arranged inside the two screw holes, a fixing circular ring is fixedly mounted on the top of the mountingseat, a support triangular plate is arranged inside the fixing circular ring, first sliders are fixedly mounted on three corners of the side surfaces of the support triangular plate, and an annular slide groove which corresponds to the first sliders is formed in the inner wall of the fixing circular ring. The solar photovoltaic panel with the convenience in adjustment has the advantages that the support triangular plate can rotate by 360 degrees inside the fixing circular ring in first slider and annular slide groove modes, accordingly, the direction of a photovoltaic panel body can be conveniently adjusted by users, requirements of the photovoltaic panel body on light rays in different directions can be effectively met, and the work efficiency of the photovoltaic panel body can be effectively improved.

The invention discloses a ceiling fan cleaning device, comprising a main rod, an adsorption disc arranged at the top end of the main rod, a rotary sleeve arranged below the adsorption disc and covering outside the main rod, three sliding bars transversely fixed at outer side of the rotary sleeve and forming a uniform circular array, a cleaning device arranged on the sliding bars, a dirt collecting bucket covering on the outer wall of the rotary sleeve, and a power source and a control button arranged at the bottom end of the main rod. The ceiling fan cleaning device disclosed by the invention can easily clean dirt on the surface of a ceiling fan, can save time and labor, solves the problem that the ceiling fan is difficult to clean, and provides great convenience for people.

The invention discloses a steel rail anti-fall device used for an electromagnetic crane, and relates to equipment used in the processes such as conveying, loading, transporting and the like of a steel rail. The device comprises a fixed frame connected with the electromagnetic crane and a suspender used for locking the steel rail, wherein the fixed frame is also provided with a lifting mechanism which is used for driving the suspender to move longitudinally; the lifting mechanism is provided with a transversely moving mechanism which is used for driving the suspender to move transversely; and the lifting mechanism is also provided with a steering mechanism used for driving the suspender to rotate. Further, the transversely moving mechanism is provided with a grating ranging positioner used for positioning the relative position between the suspender and the steel rail. In the device, the arrangement of the grating ranging positioner in the transversely moving mechanism makes the suspender in the device perform fine adjustment accurately; combining lifting and rotating actions of the suspender, the suspended steel rail can be locked effectively so as to prevent the steel rail from falling; and the lower end of the suspender has an inverted T shape and is in clearance fit with an adjacent steel rail. Therefore, the suspender is not only convenient to exert, but also not easy to cause the abrasion of the suspender and the steel rail.

The invention discloses a non-standard wear-resisting stop block chain feeding and pulling device, which comprises a chain stopper, wherein a roller shaft is connected to the upper portion of the chain stopper through a supporting piece; a roller is assembled on the roller shaft; a balance block is connected to one side of the roller shaft through the supporting piece; the balance block is connected with a novel stop block through a rotary pin shaft; and a positioning pin shaft is installed at the other end of the novel stop block. The end face of one side of the novel stop block of the deviceadopts a U-shaped ring surface design and is obviously increased in contact area, therefore, the abrasion of the stop block is reduced. In addition, a chain guide groove is additionally formed in therear part of the U-shaped ring surface; the limiting function is achieved, a motion space is provided for the vertical chain ring, the novel stop block does not need to be opened during anchor weighing, and only the positioning pin shaft needs to be moved away. Thus, operation is convenient, and in the anchor weighing process, if the anchor windlass is overloaded, a chain disengaging phenomenon occurs. Therefore, the novel stop block is not opened at the moment, an anchor chain can be effectively clamped, and therefore the anchor windlass is protected.

The invention discloses a construction structure for slope monitoring and protection, and relates to the technical field of building construction. The construction structure for slope monitoring and protection comprises a bedrock layer, slope soil is arranged on the bedrock layer, a landslide is arranged on the slope soil, an inclinometer pipe arranged on the slope soil in a penetrating manner is also included, the bottom end of the inclinometer pipe is inserted into the bedrock layer, and a power source and a wireless data transmitting device are arranged at the top end of the inclinometer pipe. According to the construction structure for slope monitoring and protection, a slope can be detected and protected, and the construction structure plays an important role in preventing collapse of unstable blocks, improving the stress state of the slope and improving the overall stability of the slope; and according to the influence of rainfall and underground water on the slope, the slope is divided into an upper part and a lower part to be independently monitored (the water content and the collapse angle of the slope are monitored), so that positioning treatment is carried out according to the water content conditions and the collapse conditions of the upper part and the lower part of the slope.

The invention discloses a bulkhead for filtering hair. The bulkhead comprises a gag (2). A support rod (3) is vertically arranged at the centre of the bottom surface of the gag (2). A plurality of mushroom-like structures (4) are arranged on the support rod (3). A projection (1) is arranged on the top surface of the gag (2). Hair can be stuck by the comb-like structures of the mushroom-like structures effectively. The bulkhead has simple structure, but can solve the annoying problems. The back side of the bulkhead has a structure which can be raised by hands, so hands cannot be dirty. The distance among the mushroom-like structures determines that hair on the mushroom-like structures can be cleared easily.

The invention provides a circuit breaker with an anti-electric-shock device. The circuit breaker comprises a circuit breaker body, an upper terminal, a handle, a lower terminal, a first protective shell and a second protective shell, wherein the upper terminal, the handle and the lower terminal are fixedly connected to the upper portion, the middle portion and the lower portion of the outer wall of the circuit breaker body respectively; an upper sliding groove and a lower sliding groove are formed in the upper side and the lower side of the lower terminal respectively; the first protective shell is located on the outer side of the upper terminal; the second protective shell is located on the outer side of the lower terminal; the upper plane and the lower plane of the second protective shell are connected with the upper sliding groove and the lower sliding groove in an embedded mode. The circuit breaker has the advantages that the first protective shell and the second protective shell are arranged so that the exposed terminals can be effectively covered, the terminals are prevented from being touched mistakenly by people during operation, electric shock is effectively avoided, and safety is ensured.

The invention provides a quakeproof antifreeze building base which comprises a cement block, an upper top base and a lower top base. An antifreeze layer is fixedly connected to the four sides of the cement block, grooves are inlaid in the top of the upper top base and arranged longitudinally in a semicircular shape, the depth of each groove is 3 cm, holes are formed in the grooves in a penetratingmode, the holes are arranged irregularly in a circular shape, the flow speed of the holes is two milliliters per second, drainage holes are formed in the left side and the right side of the upper topbase in a penetrating mode and arranged longitudinally, and connection pipes are arranged in a cylindrical shape. The antifreeze layer is arranged on the outer side of the cement block in a surrounding mode and made from rubber modified asphalt and antifreeze cotton, the main body of the cement block can be effectively protected through the materials of the antifreeze layer, the problem that frost cracking is caused to the surface of the cement block since the weather is too cold can be prevented, and the quakeproof antifreeze building base is applicable to production and use, and has the good development prospect.

The invention discloses a pasteurization device for konjak processing for preventing konjak from floating. The pasteurization device comprises a sterilization box, a cooling component and a draining component; a heating device and a liquid temperature sensor are arranged in the sterilization box; the cooling component is arranged at one side of the sterilization box; the draining component is arranged at one side of the cooling component; a first conveying roller and a second conveying roller are respectively arranged at two sides of the top of the sterilization box; a third conveying roller and a fourth conveying roller are fixedly arranged in the sterilization box; the pasteurization device also comprises a conveying belt; and the conveying belt sequentially winds the first conveying roller, the second conveying roller, the third conveying roller and fourth conveying roller. The pasteurization device has a novel structural design, can realize pasteurization treatment on konjak, can prevent the konjak from floating in a transmission process, and improves sterilization efficiency.

The invention discloses a constructional engineering material elevator that comprises an elevator body, wherein a motor is arranged at the upper end of the elevator body, a cable storage mechanism isarranged at the lower end of the motor, a first cable is arranged on the outer surface of the lower end of the cable storage mechanism, a fixing structure is arranged at the front end of the first cable, a box body is arranged on the outer surface of the rear end of the fixing structure, and a lifting line is arranged on the outer surface of the upper end of the box body. According to the constructional engineering material elevator, electric energy is transmitted to a mechanism through a transmission line, the mechanism can work, by transmitting the electric energy to the electric connectingend, an electric connecting end is powered on, a working signal is transmitted to a rotating shaft, and the rotating shaft can rotate, so that a second cable on the outer wall of the rotating shaft contracts, the box body fixedly connected to the second cable can be slowly pulled upstairs, so that people can lift materials conveniently, the influence caused by wind power is effectively reduced, convenience is brought to people, and a better use prospect is brought.

The invention discloses an aluminum-plastic composite tube quick joint which comprises a sleeve and a connection part. The quick joint is characterized in that the connection part comprises an inner steel strip layer and a glass fiber plastic layer from outside to inside in an integral forming mode; the sleeve is provided with a pipeline insertion groove and an outward outer flange; an inverted kerf is formed in the pipeline insertion groove; the interior of the inverted kerf is sequentially provided with a clamped connection element and a locking ring in sequence from the bottom of the pipeline insertion groove to a notch; the groove wall of the inverted kerf and the outer wall of the locking ring are conical faces and make contact with each other; the inner wall of the glass fiber plastic layer is provided with an inner groove matched with the outer flange. The aluminum-plastic composite tube quick joint is quick in installation, resistant to corrosion and easy to operate.

The invention relates to an automatic fixed-length tightening device for a dust remover ash cleaning air nozzle in the field of processing of environment-friendly equipment. A working platform is arranged on a control base, electric control equipment is arranged in the control base in a matched mode, a rotary workbench is arranged on the working platform in a matched mode, the rotary workbench isarranged in cooperation with the working platform through a lifting device, a plurality of groups of branch stations are arranged between the rotary workbench and the working platform in a matched mode, the groups of branch stations are respectively arranged around the rotary workbench, the groups of branch stations comprise an air nozzle feeding station, an air core feeding station, a tighteningstation and an unloading station thereof, and the air nozzle feeding station, the air core feeding station, the tightening station and the unloading station thereof are sequentially arranged clockwise. According to the automatic fixed-length tightening device for the dust remover ash cleaning air nozzle, the fixed-length tightening of the dust remover ash cleaning air nozzle is realized through the groups of branch stations arranged around the rotary workbench, the automatic control process is completely realized, the requirement for manual operation is reduced, the working efficiency is improved, and the cost is reduced.

The invention belongs to the technical field of water floating operation platforms, and in particular, relates to a fixing device of a water floating operation platform. A water platform hydraulic lifting device is characterized in that a hydraulic oil cylinder of the water platform hydraulic lifting device is controlled by a hydraulic system in an idle state; after a rod end extends out to reach the maximum travel, a chain is clamped in a chain stopper, the hydraulic oil cylinder shrinks, and a water platform is ascended; after the hydraulic oil cylinder is operated by one travel, a fixator rotates for adjustment up and down, through holes on the side walls thereof are aligned to through holes in the side walls of pile legs, bolts are inserted, and at this time, the pile legs support the water platform; all the operations are repeated; and hydraulic lifting devices at four corner parts of the water platform are synchronously lifted to continuously hoist the water platform. The water platform hydraulic lifting device adopts a hydraulic lifting mode, and is high in efficiency and convenient for operation; the chain stopper in the lifting device can effectively clamp the chain; the chain adjusting mode is simple during lifting; and the control is convenient.

The invention discloses a tunnel segment mounting mechanism and a mounting method thereof. The mounting mechanism comprises symmetrically-distributed supporting assemblies, each supporting assembly comprises side plates, symmetrically-distributed mounting columns are arranged below the side plates, lifting columns are arranged in the mounting columns, a second hydraulic rod is arranged between the side plates, side face supporting assemblies are arranged at the two ends of the second hydraulic rod, a top supporting assembly is arranged above the side plates, a moving assembly is arranged on one side of the side plates and comprises a movable frame, a rotating disc is arranged on the movable frame, a mounting assembly is arranged on the rotating disc and comprises a second movable plate, and limiting assemblies which are symmetrically distributed are arranged on the second movable plate. The mounting mechanism is provided with a tunnel segment supporting structure capable of automatically moving, the angle, the height and the radius can be adjusted according to actual use scenes, the safety of tunnel segment mounting is greatly improved, positioning is accurate and fixing performance is good when the tunnel segments are mounted, the tunnel segments are prevented from falling off and shaking during rotating mounting, the inclined lifting design is adopted, and the mounting space is saved.

The invention provides an effective anti-collision heat preservation formwork for a building. The anti-collision heat preservation formwork comprises a frame body, a first baffle and a second baffle are fixedly installed on the inner wall of the frame body, a fixing component is installed between the first baffle and the second baffle, a first heat preservation plate and a second heat preservationplate are fixedly installed on the inner wall of the fixing component, and a buffer component is installed on the right side of the frame body. According to the effective anti-collision heat preservation formwork for the building, in the using process, the formwork is inevitable to be collided, the whole frame body is promoted to move backwards through external force collision, so that the secondbaffle is compressed in the direction of a buffer spring, through synchronous movement of a first rack and a movable assembly, a second rack is driven to move through engaging connection of a rotating gear, so that the left end of a buffer mechanism is in contact with the second baffle, the frame body is pushed back to the initial position through the buffer mechanism, meanwhile, the formwork relieves the impact force generated by impact, and therefore the effect of a good anti-impact effect of the formwork is achieved.

The invention discloses a bidirectional deep machining device, and aims to provide a device facilitating steel pipe deep machining. According to the technical scheme, the bidirectional deep machiningdevice comprises a machine body provided with a machining device; the positions, located at the two ends of the machine body and close to a fixing device, of one side of the machining device is provided with brackets, fixing boxes located on the brackets, first rotary rods, a second rotary rod, screws located on the first rotary rods, lifting tables sleeving the screws, a connection rods arrangedbetween the lifting tables at the two ends, T-shaped redirectors sleeving the top end of the second rotary rod, a bidirectional rotary motor located between the T-shaped redirectors, fixing frames arranged on the lifting tables, grooves formed in the fixing frames, cutters arranged in the grooves, and fixing devices located on the cutters, wherein the first rotary rods and the second rotary rod are located in the fixing boxes, mutually engaged through bevel gears and perpendicular to each other, and sliding devices are arranged on the lower portions of the brackets.

The invention relates to a steel column manhole structure. Slope openings are formed in the left and right sides of a manhole plate; a round pin is fixedly connected to the right side of the manhole plate, the round pin is installed in a sleeve, and the sleeve is fixedly connected with the right side of a steel column manhole; and a casing is arranged on the left edge of the steel column manhole, a joint bar is arranged in the casing, and the right end of the joint bar is clamped on the surface of the manhole plate. The invention further provides a mounting method of the steel column manhole structure. An L-shaped steel bar is welded to the right side of the manhole plate, the sleeve is installed on the L-shaped steel bar, and then the sleeve is welded beside the steel column manhole; when the manhole is closed, the manhole plate is flatly turned to enter the steel column manhole, and easily rusted metal is inserted into a gap between the left side of the manhole plate and the steel column manhole; the steel casing is welded to the left edge of the steel column manhole, the joint bar is inserted into the casing, and the right end of the joint bar is pressed on the right side surface of the manhole plate; during supervision and acceptance, the joint bar is removed, the easily rusted metal is taken out, and the manhole plate is opened; and the manhole plates of all steel columns are welded after acceptance. The mounting method has the advantages of high mounting speed of the manhole plate and high construction safety.

The invention discloses an epitaxial wafer for a diode, comprising an upper shell and a lower shell, wherein the upper shell is arranged on the top of the lower shell; The sapphire, the undoped gallium nitride and the n-type heavily doped gallium nitride are sequentially closely bonded from bottom to top, and are fixedly connected with the lower shell; The inner part of the upper shell is providedwith a multi-quantum hydrazine, p-type aluminum gallium nitrogen, p-type gallium nitride and n-type aluminum gallium nitrogen, According to the invention, An anti-reverse connection diode is mountedon top of the gallium-doped zinc oxide, The epitaxial wafer can effectively avoid the problem that the epitaxial wafer releases static electricity and conducts into the diode, at the same time, the static electricity is led into the earth by the electrostatic wire, static electricity can be well eliminated, and the diode is protected. As a groove is arranged on the surface of the titanium-aluminumconnection block, the epitaxial wafer can be effectively stuck with the diode connection pillar, and the epitaxial wafer is well fixed in the diode.

The invention discloses an accommodation box, relates to the field of office supplies, and provides the accommodation box having the advantages of simple structure, convenient use, and effective accommodation and standardization of the office supplies. The accommodation box comprises a box body, the top surface of the box body is provided with a keyway-shaped accommodating groove, the side wall of the accommodating groove is provided with a runway-shaped expansion ring, the expansion ring is made of a flexible material, and the outer wall of the expansion ring is fixedly connected with the inner wall of the accommodating groove. When the accommodation box is used, some common office supplies, such as a mobile phone, a pen and a ruler, can be directly inserted in the expansion ring, and the expansion ring made of the flexible material is simple and effectively seizes the common office supplies so as to effectively accommodate and standardize the office supplies on a desk, so work emotion of people can be adjusted, and the work efficiency is improved.

The invention relates to a derailment recovery device suitable for narrow-gauge trams in mines, which includes a fastening platform and a support plate. The upper end of the fastening platform is provided with a second fastening block, and the middle part of the fastening platform is provided with a third A round hole, the lower end of the fastening platform is provided with an auxiliary fastening block, and the lower end of the auxiliary fastening block is provided with an anti-slip rib; the middle part of the support plate is provided with a first round hole, and the right side of the first round hole is provided with For the second round hole, the upper end of the support plate is provided with an upward plate, the right side of the upward plate is provided with a transition platform, the left side of the upward plate is provided with a front contact end, and the lower end of the support plate is provided with a parallel connecting plate, so The lower end of the parallel connecting plate is provided with a first fastening block, the right side of the parallel connecting plate is provided with a descending plate, the right side of the descending plate is provided with a connecting platform, the structure is stable, the work efficiency is high, it is convenient to use, and the recovery stroke is shortened. The recovery efficiency is improved, and it has high practical application value.