240results about How to "Increase lift height" patented technology

The invention discloses a smoke waste heat comprehensive utilization device and a smoke waste heat comprehensive utilization method. The device comprises a smoke cooler, a smoke heater and a closed circulation pump, wherein the smoke cooler is arranged on a flue of the smoke outlet of a boiler air pre-heater; the smoke heater is arranged on a flue of the smoke outlet of a desulphurization tower; the water outlet of the smoke cooler and the water inlet of the smoke heater are connected by a first pipeline, and the water outlet of the smoke heater and the water inlet of the smoke cooler are connected by a second pipeline, so that a closed circulation water main circuit is formed; the closed circulation pump is arranged on the closed circulation water main circuit. According to the smoke waste heat comprehensive utilization device and the smoke waste heat comprehensive utilization method, waste heat of the boiler discharged smoke of a thermal generator set is mainly used as a heat source to heat pure smoke of the smoke outlet of a wet desulphurization tower, the operation is stable, safe and environment-friendly, and the energy-saving and environment-friendly effects are excellent.

Wheel crane mobile counterweight relates to a wheel crane. In order to improve the structure form of the wheel crane counterweight, reduce the self-weight of a suspension arm, increase lift height, increase amplitude and hoisting, in the invention, the counterweight moves backwards following a counterweight framework along with a retractable counterweight framework and a fixed counterweight framework; the horizontal distance from the gravity force of the counterweight to a turret is increased; the stresses of the front and back supporting points of the turret reaches a relative balance by increasing the external load of the turret; and the steel wire ropes of a main suspension arm hoisting machine and a movable suspension arm hoisting machine are respectively connected with the ends of the suspension arm; due to the switch and the steel wire rope static locking device of the hoisting machine that linked with the counterweight and the suspension arm, the counterweight, the suspension arm and the turret keep a triangular structure, thus preventing the counterweight framework and the suspension arm from being bent and improving the overall stability of the crane; by applying a retractable cab, a foldable suspension arm support and a counterweight fixed device, the safety and flexibility of the crane is not effected by the movable counterweight.

The invention discloses a boiler energy saving and emission reduction system based on flue gas waste heat recovery and the reheating technology. The system comprises an air preheater, a flue gas cooler, an electrostatic dust collector, a desulfurizing tower, a flue gas reheater, and a chimney. A flue gas inlet of the air preheater is communicated with a flue gas outlet of a boiler. A flue gas outlet of the air preheater is communicated with a flue gas inlet of the flue gas cooler. A flue gas outlet of the flue gas cooler is communicated with a flue gas inlet of the electrostatic dust collector. A flue gas outlet of the electrostatic dust collector is communicated with a tail flue gas inlet of the desulfurizing tower. A desulfurized flue gas outlet of the desulfurizing tower is communicated with a flue gas inlet of the flue gas reheater. A reheated flue gas outlet of the flue gas reheater is communicated with a flue gas inlet of the chimney. A hot water outlet of the flue gas cooler is communicated with a hot water inlet of the flue gas reheater. A cold water outlet of the flue gas reheater is communicated with a cold water inlet of the flue gas cooler through a booster pump. The boiler energy saving and emission reduction system based on flue gas waste heat recovery and the reheating technology allows boiler flue gas to be treated and is long in service life, energy efficient and environment friendly.

The invention discloses a special lifting machine for lifting wind power generation equipment, which has the characteristics of low production cost, smooth operation of the whole machine, low requirements for roads and high field transferring speed. The lifting machine mainly comprises a running chassis, a tower body, a lifting arm, an amplitude variation mechanism of a swinging arm and an electrical control unit, wherein the running chassis comprises a lower frame (A), a slewing mechanism (I) and an upper frame (20), wherein the upper frame (20) is connected with the lower frame (A) through the slewing mechanism (I); and an operating room (13), a balancing weight (19), a power engine (17) and a winch are arranged on the upper frame (20). The invention aims to solve the problems of the lifting equipment required for installation of the wind power equipment; and the installation of the wind power equipment requires that the lifting capacity of the lifting equipment meets the requirement, the lifting height of the lifting equipment meets the requirement, and the lifting equipment needs to be capable of quickly transferring fields. The lifting machine can also be used for lifting in other building industries.

The invention discloses a vehicular elevated integrated platform device for electric power construction. The vehicular elevated integrated platform device comprises a vehicle chassis, a platform lifting frame, a platform support frame, a 360-degree rotary table, a box-type operating platform, a cable peeling and cutting mechanism and a peeling and cutting mechanism lifting frame. Besides that the box-type operating platform can rotate relative to the platform support frame by 360 degrees and the cable peeling and cutting mechanism can rotate by 360 degrees and inclines by 0-90 degrees relative to the peeling and cutting mechanism lifting frame, the platform lifting frame can rotate relative to the vehicle chassis by 360 degrees through the 360-degree rotary table, the cable peeling and cutting mechanism can be folded into an inner cavity of the box-type operating platform, and lifting height of the platform lifting frame is increased remarkably. The cable peeling and cutting mechanism is integrated on the vehicular elevated integrated platform device for electric power construction, the vehicular elevated integrated platform device for electric power construction is simple in structure, low in manufacturing cost, convenient to maintenance and small and compact after being folded, and the cable peeling and cutting mechanism can be folded into the operating platform as being integrated on the operating platform.

The invention provides a condensation phase change type wet-process desulfurization system and method capable of removing flue gas and smoke dust in cooperation. The system comprises a wet-type desulfurization tower and a cooler arranged outside the wet-type desulfurization tower, wherein an absorbent slurry tank is arranged at the bottom of the wet-type desulfurization tower; multilayer spraying mechanisms are arranged at the upper part of the wet-type desulfurization tower from bottom to top; a demister is arranged above the spraying mechanisms; the inlet of a cooler is communicated with the absorbent slurry tank, and the outlet of the cooler is connected with the spraying mechanisms; an inlet connected with a flue gas inlet pipe is formed in the wall, under the spraying mechanisms and above the absorbent slurry tank, of the wet-type desulfurization tower; a flue gas outlet pipe is connected with the topmost end of the wet-type desulfurization tower; and the inner region, under the demister and above the flue gas inlet pipe, of the wet-type desulfurization tower is a phase change condensed dust removing layer. According to the system provided by the invention, adsorbent slurry which is circularly used by the wet-type desulfurization tower is cooled outside the tower so that flue gas in the wet-type desulfurization tower is saturated and is condensed by taking micro-fine dust as condensation cores, and the micro-fine dust falls down or is removed by the demister and a dust remover after becoming large.

The invention provides an electric carrier for road car barrier clearance. A bottom chassis of a stopped car can be lifted and moved, the bottom structure cannot be damaged during lifting, a shearing type lifting device can be adjusted in the longitudinal direction and the horizontal direction, four jack supporting points on the bottom of the car are lifted, locating is convenient and quick, speed is high, applicability is high, lifting height is high, and occupied space is small. According to one scheme, a car body of the electric carrier for road car barrier clearance comprises a function handle, a pulling rod, a storage battery, a hydraulic assembly box and a driving wheel system. The storage battery and the hydraulic assembly box are arranged in the car body. Two forks for lifting a car are arranged in front of the car body. A driving wheel system is arranged at the bottom of the car body. A fixing walking wheel, a universal walking wheel, a guiding track, a shearing type lifting device, a sliding groove, a fixing plate and a fork locating arm are further included.

In one form, a belt lifter apparatus provides increased lifting force and belt lift height by a scissors mechanism having crossed lifting arms each having a translatable end and having a translatable pivot axis between the lifting arms. Preferably, other ends of the lifting arms are fixed to an upper belt lifting member and to a lower support base member at locations such that the pivot axis translates to a position located substantially at the center of the lifted belt when the belt is lifted to the highest lift height. Lightweight, aluminum tubular members are used for the lifting member and the base support and each includes a track for supporting the translatable ends of the lifting arms. The span width of the base member is adjusted by sliding telescoping, tubular legs within the base tubular element. Pivoted wing arms are supported by braces extending to the belt lifting member.

The invention relates to a forklift gantry which comprises four classes of gantries and a goods fork frame, wherein two rear lifting oil cylinders are uniformly distributed on a connecting plate of the first class gantry, and the piston rod ends of the rear lifting oil cylinders are connected with the second class gantry; a second class chain wheel, a second class chain, the second class gantry and the first class gantry form a moving chain wheel group; the third class chain wheel, the third class chain, the second class gantry and the highest class gantry form a moving chain wheel group; andthe third class gantry and the highest class gantry are pulled by the chains to move relative to the first class gantry under the interaction of the rear lifting oil cylinders and the chains. Front lifting oil cylinders are uniformly distributed on the highest class gantry; the piston rod ends of the front lifting oil cylinders are provided with two chain wheels; and one ends of the two chains matched with the chain wheels are connected with the highest class gantry, and the other ends are connected with the rear part of the goods fork frame. The chain wheels, the chains, the highest class gantry and the goods fork frame form a moving chain wheel group; and the goods fork frame can move relative to the highest class gantry. The four groups of gantries are compactly distributed and are basically distributed in parallel, thereby ensuring minimal front suspension and favorable visual field.

The invention relates to a restoration construction method for an in-service oil gas pipeline which encounters with the collapse and destruction of a worked-out section, and relates to the technical field of pipeline systems. The restoration construction method comprises the following steps of: 1) preparing construction; 2) performing Redi positioning on the pipeline, and laying the pipeline; 3) cleaning an operating zone and excavating a pipe ditch artificially; 4) releasing the stress of the pipeline; 5) measuring coordinates of a pipeline body and arranging a stress monitoring device at the key position of the pipeline body; 6) analyzing the stressed condition of the pipeline, and determining a pipe section to be lifted and calculating the lifting height of the pipeline; 7) distributing hanging points, and performing ultrasonic detection on key weld joints; 8) determining the single-pass lifting height of each hanging point; 9) lifting the pipeline for multiple times, and detecting the internal condition of the key weld joints and stress values at key positions of the pipeline for multiple times; 10) retesting the scale height of the pipeline; 11) ramming and filling gaps at the pipe bottom; 12) releasing the hanging points; 13) performing the ultrasonic detection on the weld joints; 14) repairing cuts of an anticorrosive coating; and 15) restoring the pipeline.

The invention relates to a crank arm type aerial work platform. The crank arm type aerial work platform comprises a traveling chassis, a driving device and a lifting device. The lifting device comprises a lifting arm assembly and a working platform. The lifting arm assembly comprises a folding arm assembly, a telescopic arm assembly and a four-bar linkage leveling arm assembly. The working platform is further provided with a horizon sensor. According to the aerial work platform, it can be guaranteed that the work platform is maintained to be balanced in the lifting process all the time. In addition, on the basis of guaranteeing the stability, the lifting height of the work platform is increased, the function of aerial horizontal swinging adjusting of the work platform is also additionally provided, and entire use is more flexible. In addition, the entire driving device of the crank arm type aerial work platform can rotate, the work platform is driven to rotate, and the working radius is increased.

The invention provides a flat-head tower crane. The common tower cranes are generally provided with tower tops, and when a group of towers carry out cross operation, the common tower cranes are hard to be competent in many occasions with special requirement for height because of being limited by the tower tops. The flat-head tower crane comprises an undercarriage (1). The invention is characterized in that a group of standard sections (2) are connected on the undercarriage in order; the standard section arranged at the upper end is connected with a swivel assembly; a wrap frame (3) arranged outside the standard sections is connected with the lower part of the swivel assembly and a swivel tower body (4) is connected with the upper part of the swivel assembly; one side of the swivel tower body is connected with a boom (6) by a boom tension bar (5) and the other side thereof is connected with a balance boom (8) by a balance boom tension bar (7); the boom tension bar is connected with a speed changed trolley (9); and a hook (10) is linked with the lower part of the speed changed trolley. The tower crane serves as an elevator.

The invention discloses a safety pin interlocking device for a crane, a single cylinder safety pin type telescopic arm and a crane. The safety pin interlocking device for the crane comprises a pin pull device dovetail groove and a mechanical lock which is fixedly connected with the dovetail groove; the motion path of the dovetail groove is perpendicular to an axis of a cylinder pin; meanwhile, the motion path of an upper cylinder pin is intersected with the motion path of the dovetail groove, and the motion path of a lower cylinder pin is intersected with the motion path of the mechanical lock; when the arm pin moves to the unlocking position, an arm pin pulling oil cylinder drives the dovetail groove to lock the upper cylinder pin, and meanwhile, the dovetail groove drives the mechanicallock to lock the lower cylinder pin; and when the cylinder pin moves to the unlocking position, the upper cylinder pin locks the dovetail groove by a cylinder pin body, and meanwhile, the lower cylinder pin locks the mechanical lock by the cylinder pin body, thereby the arm pin is directly and indirectly locked. The single cylinder safety pin type telescopic arm and telescopic arm type crane provided by the invention comprise the safety pin interlocking device.

The invention discloses a manual lifting trolley for forking and lifting, which relates to lifting machines for handling in the technical field of engineering and comprises a pair of I-shaped lifting beam columns (8), a frame component, a forking and lifting component, a hoisting and lifting component and a trundle lifting mechanism. The trundle lifting mechanism comprises a pair of directional trundles, a trundle lifting unit and a trundle lifting switching device. The manual lifting trolley has the advantages that the manual lifting trolley can adapt to large lifting heights, can be used for stacking articles irregular in shape and poor in placement stability, can also move on uneven pavements, is low in price, and the like. The manual lifting trolley can be used for factory workshops, can also be used for factory storages and for lifting articles in logistics warehouses, and can further be used for lifting equipment in repair industries of machines, electrical equipment and the like.

A lower-back supporting structure for a bed or a chair includes a sliding base, two scissor lifts, a driver and a supporting member. The sliding base has a pair of slide slots and a pair of rotating pins, a securing portion between the two rotating pins, and a plurality of the locking apertures. Two scissor lifts both have an X-shaped frame having a pivot. A driver has a positioning end, an extendable rod, a through hole and a sliding rod placed through the slide slot, the through hole and the first front cotter holes. A supporting member has a pair of slide tracks and a pair of rotating holes. The driver drives the sliding rod along the slide slot of the sliding base to shorten the extendable rod, the scissor lifts rotate around the pivots to lift such that the supporting member is pushed away from the sliding base.

The invention discloses a discharged flue gas self-heating technology of wet flue gas desulfurization. Original flue gas is divided into the thionizer entering flue gas and the bypass flue gas. After the thionizer entering flue gas is washed by spraying a doctor solution in a thionizer, purified flue gas is formed and enters a straight discharging chimney. The bypass flue gas is conveyed into the straight discharging chimney. In the straight discharging chimney, the purified flue gas and the bypass flue gas are fully mixed and then discharged into the atmosphere. Mixed flue gas meets the requirement for environment-protection discharging, meanwhile, the bypass flue gas exchanges heat with the purified flue gas, so that the temperature of the mixed flue gas is raised, and the discharging temperature of the mixed flue gas is controlled to reach more than 70 DEG C. The invention further discloses a desulfuration purified flue gas self-heating device. In order to overcome the defects of a GGH, heat flue gas is used for directly heating the purified flue gas, and the heat flue gas and the purified flue gas are mixed and then discharged. The technology is simple, resistance is small, the GGH does not need to be arranged, the maintenance workload of the device is small, and therefore the wet flue gas desulfurization device is more simple and more practical in technology and meets the requirement for long-time efficient operation.

The invention relates to an auxiliary arm system and a crawler crane. The auxiliary arm system comprises an auxiliary arm rear pull plate, an auxiliary arm support, an auxiliary arm, an auxiliary arm front pull plate and a main cargo boom. The auxiliary arm support is composed of a top section arm and a bottom section arm. The bottom end of the auxiliary arm, the bottom section arm of the auxiliary arm support and the top end of the main cargo boom are connected together. The two ends of the auxiliary arm rear pull plate are respectively connected to the bottom end of the main cargo boom and the top section arm of the auxiliary arm support. The two ends of the auxiliary arm front pull plate are respectively connected to the top section arm of the auxiliary arm support and the top end of the auxiliary arm. According to the auxiliary arm system, as torque on a hinge point of the auxiliary arm support from the auxiliary arm rear pull plate is small, the backward overturning torque of a boom system is reduced, the backward overturning possibility of the boom system is reduced, and the whole crane can be stable. Components of the auxiliary arm system are some components of a tower-type auxiliary arm system, and therefore the cost does not need to be increased, and the utilization rate of the crane structure is increased.

The invention relates to a garden modeling robot which comprises a vehicle frame and walking wheels arranged at the bottom of the vehicle frame. A guide rail is arranged at the front end of the vehicle frame, a first lifting frame is arranged on the guide rail in the length direction of the guide rail in a sliding manner, and a first vertical driving piece for driving the first lifting frame to slide in the vertical direction is arranged on the vehicle frame; a second lifting frame is slidably connected into the first lifting frame in the vertical direction, a second vertical driving piece fordriving the second lifting frame to slide in the vertical direction is arranged on the first lifting frame, and an electric saw is arranged on the second lifting frame; and the second lifting frame is provided with a horizontal driving piece for driving the electric saw to slide in the horizontal direction and a rotary driving piece for driving the electric saw to rotate in the circumferential direction of the electric saw. When the garden modeling robot works, the walking wheels drive the vehicle frame to walk, due to the arrangement of the first lifting frame and the second lifting frame, the electric saw can be lifted twice, the lifting height of the electric saw can be effectively increased, and therefore the garden modeling robot adapts to pruning of plants with different heights, and the adaptability of the garden modeling robot in the pruning process is effectively improved.

The invention relates to a transportation platform, particularly to a comprehensive moving transportation platform capable of lifting, and belongs to the field of transportation and assembly. The platform comprises a platform, a lifting mechanism and moving mechanisms, wherein the lifting mechanism and the moving mechanisms are respectively fixed on the platform. The platform disclosed by the invention is characterized in that the three moving mechanisms are fixed on the platform and circumferentially and uniformly distributed and mounted on the platform at intervals of 120 degrees. The platform disclosed by the invention is simple in structure, is flexible in movement, is large in lifting scope, is small in occupied space, greatly saves the labor force, has a higher lifting height, and is stable in lifting operation. A lifting speed can be regulated by regulating the rotating speed of a motor, the control performance is good, and the safety performance is good.

The invention discloses a method for improving temperature of smoke discharged by a thermal power plant, a smoke heating system and a thermal power generation unit adopting the system. The method utilizes waste steam of a driving steam turbine to heat the smoke passing through and flowing out of a desulfurizing absorption tower, and then heated smoke is discharged into a chimney. The smoke heating system comprises a smoke heating device which is arranged between the desulfurizing absorption tower and the chimney and used for utilizing the waste steam of the driving steam turbine to heat the smoke. The smoke heating system fully utilizes the waste steam energy of the driving steam turbine, especially latent heat of vaporization in the waste steam, the overall efficiency of the thermal power plant is improved, meanwhile the smoke rising height is increased, the pollutant falling concentration is reduced, and environmental protection is facilitated.

The invention discloses a traction type arch-bridge crane of a crane carriage. The traction type arch-bridge crane comprises the crane carriage, a crane span structure, a cart travelling mechanism and electrical control equipment, wherein the crane span structure is a four-beam structure which is arched in middle; a crane carriage travelling rail on the crane span structure is laid along an arched main beam upper cover; a trolley travelling mechanism of the crane carriage is a trolley traction mechanism which is arranged on the end part of the crane span structure; the trolley traction mechanism drives a winding drum set to rotate by virtue of a motor and a speed reducer, so that a steel wire rope wound on the winding drum set is synchronously collected and released to generate traction drive for driving the crane carriage to move. The traction type arch-bridge crane has the beneficial effects that: a mid-span part is high in lifting height, and a space utilization rate of a plant ceiling is increased; driving torque of the trolley traction mechanism is small, so that the crane carriage is safe and stable in operation, and relatively high in positioning precision; civil engineering construction cost can be reduced for a special occasion; and the design is compact, space usage is small and the space utilization rate is high.

The invention relates to a working device of a wheel type telescopic arm loader. The working device is characterized by being composed of a front frame, a telescopic arm stage I arm, a telescopic armstage II arm, a bucket, an amplitude-increasing oil cylinder, a slave oil cylinder, a telescopic oil cylinder, a bucket rotation oil cylinder and the like. The working device of the wheel type telescopic arm loader takes the amplitude-increasing oil cylinder as a driving component, and the amplitude-increasing oil cylinder is hinged to the two sides of the telescopic arm stage I arm to realize thelifting and lowering of a telescopic arm; meanwhile, the rear end of the telescopic arm stage I arm is hinged to the front frame, the relative movement of the telescopic arm stage II arm and the telescopic arm stage I arm is controlled through the telescopic oil cylinder, and the telescopic arm stage II arm and the telescopic arm stage I arm are supported by a nylon sliding block; and a six-linkbucket turnover mechanism is designed at the front end of the telescopic arm stage II arm, in the six-link bucket turnover mechanism, the bucket rotation oil cylinder is a driving link, and the rotation angle requirements of the bucket in the limit position can be met. According to the working device, the loader has a bucket rotation angle range similar to that of an ordinary wheel type loader, and further has a higher unloading height and a larger working range.

The invention provides a method and a device for lifting roadbed settlement of the existing road. The method comprises the following steps: horizontally inserting a plurality of plate-shaped lifters capable of performing one-dimensional expansion into the roadbed sequentially according to the position and the quantity required by the design in the zone where the roadbed of the road is settled non-uniformly and in the certain distance below the contact interface between the road surface and the foundation, wherein the lifters are gradually expanded vertically according to the sequence, and the expansion rate and the expansion amplitude required by the design, so that the settled roadbed is lifted and recovered to the roadbed design target value; sequentially substituting block materials with sufficient strength and grouting holes for the plate-shaped lifters; and injecting a proper amount of known gel materials so as to fill the gap of the block materials, form holes in soil in the lifting process and fulfill the aim of lifting the roadbed settlement of the existing road.

The invention provides a combined type multifunctional hanger which comprises a double plate type balance beam, wherein the double plate type balance beam is formed by two parallel balance plates; a supporting type balance beam is arranged below the double plate type balance beam; the supporting type balance beam comprises a transverse beam; one supporting plate is mounted at one end of the transverse beam, and the other supporting plate is mounted at the other end of the transverse beam; hook fixing shafts and limiting shafts are mounted between the supporting plates; hooks are mounted on the hook fixing shafts; all the limiting shafts are connected through annular slings; movable limiting shafts are arranged in the annular slings; two ends of each movable limiting shaft move along horizontal guiding grooves in horizontal guiding plates; both a first horizontal guiding plate and a second horizontal guiding plate are connected with the transverse beam; the limiting shafts are connected through resetting tension springs; and a plurality of sling guiding shafts are mounted between the supporting plates. According to the hanger, during hoisting, a bending moment and transverse supporting force borne by the hanger can be offset, the hoisting height of a hoisting device is effectively increased, and hoisting requirements of large and heavy industrial equipment are met.

The invention discloses a method and equipment for generating electricity and preparing fresh water by use of a low-temperature heat source. The equipment consists of a seawater pump, a heater, a flash evaporator, a superheater, a mixing chamber, an ascending pipe, a chimney, an air condenser, a water tank, a vacuum pump, a descending pipe, a water turbine generator set, a fresh water pool, a hydraulic ram and an atomization nozzle. In the invention, the seawater is subjected to the steps of heating, flash evaporation, superheating and the like to form low-pressure superheated steam; the superheated steam contacts in the mixing chamber, carries fogdrop, enters the ascending pipe and flows into the air condenser at the top of the chimney to be cooled into condensed water; the condensed water enters the water tank and flows downward through the descending pipe to flush the water turbine generator set to do work and generate electricity and then is stored in the fresh water pool; part of the fresh water is conveyed to the atomization nozzle by the hydraulic ram to be sprayed into the mixing chamber. The equipment disclosed by the invention can make full use of the low-temperature heat source to generate electricity, has the characteristics of high conversion efficiency, high net output power, low generating cost, abundant production of byproduct freshwater and the like, and can be widely applied to the technical field of low-temperature heat source utilization.

The invention discloses a rotary elevating mechanism of a liquid crystal screen rack for showing car and belongs to the technical field of car show. The showed car comprises a chassis girder of a car frame and a carriage body. The rotary elevating mechanism of the liquid crystal screen rack comprises a fixed box rotating device which is mounted on the chassis girder of the car frame, a fixed box which is connected with the fixed box rotating device, a display screen rack elevating device which is matched with the fixed box, a fixed display screen rack which is corresponding to one side of the display screen rack elevating mechanism, a movable display screen rack which is corresponding to the other side of the display screen rack elevating mechanism, and a pair of movable display screen rack turning and folding devices which is mounted at the side of the fixed display screen rack towards the movable display screen rack, wherein the display screen rack elevating mechanism has sleeve type overlapped structure. The rotary elevating mechanism of the liquid crystal screen rack for showing car is capable of avoiding the directional limits in different angles in showing, enables the display and watching effects to be improved, enables the structure to be simplified, and is capable of representing the display screen rack in double-wide structure in use so that the large screen display requirement is satisfied.

The invention discloses a double-stage lifting type crawler pump truck. The double-stage lifting type crawler pump truck comprises a crawler type chassis, a first bearing platform, a second bearing platform, a drainage mechanism, a scissor type lifting mechanism and a first lifting rod; the first bearing platform is arranged above the crawler type chassis; the second bearing platform is arranged above the first bearing platform; the drainage mechanism is arranged on the second bearing platform; the scissor type lifting mechanism is arranged between the crawler type chassis and the first bearing platform; and the first lifting rod is vertically arranged. A space occupied in the height direction by the scissor type lifting mechanism when in a folded state is used for placing a cylinder barrel of the first lifting rod, so that the lifting height of the second lifting platform occupied when the scissor type lifting mechanism occupies the equivalent space is increased, or when the lifting height is the same, the occupation space when the scissor type lifting mechanism is folded is reduced, the space utilization ratio of the scissor type lifting mechanism is increased and the riding stability of a drainage truck is improved.

The invention discloses a lifting device suitable for an underground ally and a chamber. The lifting device consists of two main beams (1), four fixed anchoring rods (2), bearing angle steel (3), connection angle steel (4), an I-shaped steel rail (5) and an electric bottle guard (6), wherein the four anchoring rods (2) are perpendicularly anchored in an alley arch supporting and protecting body (7), and an upper rock body of the alley arch supporting and protecting body (7); the bearing angle steel (3) is arranged at the lower ends of the anchoring rods (2) through bolts; the two main beams are parallel to each other and are horizontally arranged on the bearing angle steel (3) side by side through bolts; the I-shaped steel rail (5) is horizontally arranged on the main beams (1) through the connection angle steel (4) and are distributed along the direction of the alley or the chamber; a roller of the electric bottle guard (6) is arranged on the I-shaped steel rail (5); and the main beams (1) adopt groove steel structures. The lifting device has the advantages of simple structure, convenience in use and dismounting, wide application range, light structural weight and high bearing capacity and is very suitable for facilities such as underground machine maintenance chambers and water pumps; and the span of the main beams is small.

The invention discloses a crane suitable for roadway hoisting. The crane comprises a getting-off part and a getting-on part, the getting-off part includes a frame, a base, a slewing bearing and the like, the getting-on part includes a duckbill-type cargo boom structure and the like, the lower part of the base is connected to the frame, the lower part is connected to a rotary table through the slewing bearing, the four corners of the base are provided with four support lugs, and the four support lugs are hinged to four landing legs. The frame is a steel structure frame, the rear part is connected with two rear wheels through an axle, and the front part is hinged to two front wheels; a tow bar is drawn out from an axle of the front wheels and is used for being connected with other vehicles,and the walking function of the crane is realized; one end of the duckbill-type cargo boom structure is hinged to the rotary table, and the other end is a free end so as to be used for lifting heavy objects, one end of a lifting cylinder is hinged to the rotary table, and the other end of the lifting cylinder is hinged to the duckbill-type cargo boom structure; and the rotary motor is installed atthe front end of the rotary table and is meshed with the slewing bearing, and lifting, jacking and turning functions of the crane can be realized. The crane solves the problem about heavy object lifting in a tunnel or a culvert.