42results about How to "Ensure the center of gravity is balanced" patented technology

The invention discloses an electric paying-off automobile, and belongs to the technical field of electric winding-up and paying-off devices of cables. The electric paying-off automobile is flexible to move and convenient to use. According to the technical scheme, the electric paying-off automobile comprises an automobile frame, a triangle supporting frame, a cable wheel, hydraulic jacks and a hydraulic drive device; the triangle supporting frame is hinged to the tail end of the automobile frame through a supporting rod; the number of the hydraulic jacks is two; the ends of piston rods of the hydraulic jacks are hinged to sides opposite to the peak of the triangle supporting frame respectively; both the ends of cylinder bodies of the hydraulic jacks are hinged to the automobile frame. The electric paying-off automobile is applied to all kinds of electric power and communication departments.

The invention discloses a VR device, comprising a VR body, a fixing block, a fixing support, a threaded rod and a connection rod. The fixing rod is fixed to the upper surface of the VR body, a slidingsleeve is arranged on the fixing rod and is fixed to one side of a first protective cover, the fixing block is fixed to the tail end of the fixing rod, a second protective cover is fixed to the innerside of the fixing block, the fixing support is fixed to the outer side of the fixing block, a fixing groove in reserved in the fixing support, a fixing plate is arranged in the fixing groove, a support rod is arranged below the fixing plate, the lower surface of the support rod is in contact with the inner wall of the fixing groove, one end of the support rod is connected with one side of the VRbody, the connection rod is fixed to the support rod, and the tail end of the connection rod is fixedly provided with a headset. The VR device has the fixing rod and the support rod both made of elastic material, and therefore, it is convenient to adjust the position and bending angle of the fixing rod and the support rod.

The invention discloses a climbing shoe. The climbing shoe is characterized by comprising a shoe fixing plate; one side of the shoe fixing plate is hinged to an overturning frame; a guide plate is fixedly arranged on the overturning frame and is used for guiding a rope from the front end of the guide plate into a rope groove which is formed vertically; a locking plate is arranged on one side of the guide plate and is hinged to the overturning frame; a locking block is arranged at one end of the locking plate; when a person climbs, the rope is guided into the rope groove through the opening in the front end of the guide plate; when the gravity of a human body is transmitted to the shoe fixing plate through the shoe and the person treads downwards, the overturning frame is driven to overturn upwards; the rope groove becomes inclined, the rope in the rope groove pushes the locking plate to overturn reversely, and the rope is locked by the locking block. According to the climbing shoe, a climbing action is performed by utilizing the treading force of a foot, and the problem of overexertion of hand parts during a climbing process is solved, so that wild climbing exercise, rescuing work and the like become easier.

The invention relates to an offshore movable wind power generation system. The offshore movable wind power generation system is characterized in that a movable power generation energy storage ship navigates to an offshore wind power plant anchorage and carries out anchoring power generation energy storage, and stores electric energy into an energy storage liquid of the movable power generation energy storage ship, the movable power generation energy storage ship which fully stores the energy navigates to a longshore energy storage liquid exchange pump station, and exchanges the energy storage liquid which fully stores the energy, with the energy storage liquid which does not store the energy through the energy storage liquid exchange pump station, and the energy storage liquid which fully stores the energy in the energy storage liquid exchange pump station is subjected to bidirectional exchange with a longshore converter station; and the longshore converter station uses the energy storage liquid which fully stores the energy for generating power and conveys the electric energy to a load centre through a power transmission and distribution system, and meanwhile, the longshore converter station returns the energy storage liquid which is already used for generating power to the energy storage liquid exchange pump station. The offshore movable wind power generation system disclosed by the invention is capable of conveying the electric energy to shore for utilization without the limit of an offshore distance by virtue of the characteristic that the energy storage liquid is capable of being subjected to long-distance transportation without energy losses; and meanwhile, the energy storage liquid is capable of being repeatedly used without damages.

The invention discloses a lifting rotating device for vehicle storing and fetching of a three-dimensional garage. The lifting rotating device comprises a base, a lifting frame, a supporting carrier plate, a rotating carrier plate and an extensible bridging carrier plate, the lifting frame is fixed on the base, the supporting carrier plate is arranged above the base and fixedly connected with the lifting frame, the rotating carrier plate is arranged above the supporting carrier plate, and the extensible bridging carrier plate is arranged between the supporting carrier plate and the rotating carrier plate. During vehicle storing and fetching, the extensible bridging carrier plate extends out to be connected on a parking platform of the three-dimensional garage in an overlapped manner, and the rotating carrier plate rotates onto the extensible bridging carrier plate and corresponds to the parking platform. The lifting rotating device can be used for the three-dimensional garages different in building style, quick vehicle storing and fetching can be realized, and the problem that a vehicle storing and collecting system is only suitable for annular multilayer three-dimensional garages in the prior art is solved.

The invention relates to an air-cooled intermediate bearing. The air-cooled intermediate bearing comprises a bearing seat, an upper bearing bush, a lower bearing bush and a bearing cap. The upper bearing bush and the lower bearing bush clamp a shaft, are supported on the bearing seat and are covered with the bearing cap. The two sides of the upper bearing bush and the two sides of the lower bearing bush are connected with outer oil tanks correspondingly. Each outer oil tank comprises an upper oil tank body, a lower oil tank body, an upper side cover, a lower side cover, oil throwers, an oil collection box and an oil inlet pipeline, wherein the upper oil tank body and the lower oil tank body are connected to the outer side of the upper bearing bush and the outer side of the lower bearing bush and are combined and connected into a whole through bolts; the upper side cover and the lower side cover are combined and connected into a whole through bolts and arranged at the outer end of the upper oil tank body and the outer end of the lower oil tank body in a sealing mode correspondingly, a plurality of cooling fins are evenly distributed on the outer side of the upper side cover in the circumferential direction, and a plurality of cooling fins are evenly distributed on the outer side of the lower side cover in the circumferential direction; the oil throwers are connected to the shaft in a penetrating mode and arranged in the upper oil tank body and the lower oil tank body correspondingly; the oil collection box is correspondingly arranged above the oil throwers and connected to the oil inlet pipeline; and the oil inlet pipeline is connected to the inner wall of the upper oil tank body or the outer wall of the upper bearing bush. A lubricating channel is formed in the upper bearing bush, the two ends of the lubricating channel communicate with the oil inlet pipelines of the two outer oil tanks correspondingly, and a lubricating cavity is formed in the middle of the lubricating channel and communicates with a gap between the upper bearing bush and the shaft. Supporting and lubricating loops which integrally communicate with each other are arranged on the supporting face between the lower bearing bush and the bearing seat and the covering face between the upper bearing bush and the bearing cap correspondingly and communicate with the lubricating cavity.

The invention discloses a heavy-load wall climbing robot for building outer wall inspection. The robot comprises a first main body frame, a second main body frame, a transverse connecting frame, a fanassembly, a power device, a pulley assembly, a flight control processor, a master controller and a wireless communication module. The first main body frame and the second main body frame are matchedand connected through a transverse connecting frame; the fan assembly is connected with the first main body frame, the second main body frame and the transverse connecting frame in a matched mode, andthe fan assembly is used for providing thrust opposite to gravity and pressure facing the wall for the robot; the power device is connected with the fan assembly in a matched mode, the flight controlprocessor is connected with the power device, and the main controller is connected with the wireless communication module and the flight control processor. The pulley assembly is arranged on the first main body frame and the second main body frame, and is attached to a wall body during inspection; the fan is used for providing thrust opposite to gravity and pressure facing a wall body for the robot, so that the robot can stably fly in a manner of being attached to the detected wall surface, and the gravity center is kept balanced.

The invention relates to a multifunctional parturition ball chair. The multifunctional parturition ball chair is characterized by comprising a base, a positioning ring, a parturition ball, a back frame, a plurality of massage balls, armrests and an infusion support, wherein the positioning ring is arranged above the base and fixed to the base through a plurality of vertical rods; the parturition ball is placed in the positioning ring; the back frame is fixedly connected to the base and the positioning ring; the massage balls are arranged on the surface of the front side of the back frame; thearmrests are arranged on the two sides of the back frame; and the infusion support is vertically mounted beside the armrests, and hooks are arranged on the infusion support. The multifunctional parturition ball chair is ingenious in structure and reasonable in design, safety of a lying-in woman during exercise can be guaranteed, discomfort of the waist and the back of the lying-in woman can be relieved, the lying-in woman can lean against the back frame to have a rest, fatigue is relieved, comfort is improved, and besides, the lying-in woman can exercise during infusion.

The invention discloses artificial-intelligence exercise assistance equipment, belongs to the technical field of artificial-intelligence exercise equipment, and solves the problems that existing robots for assisting in walking in the market cannot run according to the driving will of the human body and are poor in exercise effect. The artificial-intelligence exercise assistance equipment is characterized by comprising a knee joint rotation connector, a hip joint protection plate, a thigh support plate, a shank support plate and a foot support plate, wherein a sensor component is arranged on the foot support plate and used for detecting the stress distribution of the foot support plate and provides convenience for adjusting the overall length, and therefore the equipment is applicable to people of different heights and high in wearing stability. Adjustment of the bending angle between an upper knee expansion plate and the shank support plate is achieved by adjusting the rotation of theknee joint rotation connector, and therefore the exercise assistance equipment runs according to the driving will of the human body and keeps the gravity balance of the human body at the same time. Under the assistance of the exercise assistance equipment, time and strength are saved, and the walking movement of limbs is facilitated.

The invention discloses an active balance anti-wave boat control system. A first floating body and a second floating body are located below a boat body, a balance sensing unit is installed on the boatbody for detecting boat body balance, hydraulic cavities of a first hydraulic driving unit and a second hydraulic driving unit are communicated through a hydraulic reversing unit, a controller controls the hydraulic reversing unit according to detection signals of the balance sensing unit to switch the liquid flow directions of a first oil way and a second oil way so that the first floating bodyand the second floating body can be controlled by the first hydraulic driving unit and the second hydraulic driving unit to ascend and descend. According to an optimally-designed active balance anti-wave boat control method, when the balance sensing unit detects that the boat body is inclined to one floating body direction, the controller controls the hydraulic reversing unit to switch the liquidsupply direction, the floating body ascends while the floating body on the other side descends, the boat body gravity balance is ensured, meanwhile, the higher floating body descends, the contact areabetween water and the floating bodies is increased, the inclined resistance is increased, and the boat body is prevented from being capsized.

The invention discloses a harmonica frame convenient for playing of a guitar. The harmonica frame comprises a harmonica frame device and a clamping device. The harmonica frame is mainly characterized in that the clamping device comprises an upper clamp piece and a lower clamp piece. A square plate is arranged on a centre line above the upper clamp piece; the square plate is provided with a threaded hole along the length direction; a screw rod is cooperatively connected with the threaded hole through thread; an upper rubber layer and a lower rubber layer are arranged under the upper clamp piece and above the lower clamp piece respectively; a circular hole and a communicated square hole are arranged in a center line above an upper clamp handle; the inner diameter of the circular hole is connected with the external diameter of a bearing; the inner diameter of the bearing is connected with the external diameter of a bolt head of a crosshead bolt; a lower clamp handle is in a square structure fit with the square hole; a threaded hole is arranged in a center line above the lower clamp handle; and after the lower portion of the crosshead bolt is screwed into the threaded hole, when the crosshead bolt is rotated anticlockwise or clockwise, the lower clamp handle can drive the lower clamp piece to move downward or upward. The harmonica frame allows the guitar and the harmonica to be played simultaneously, and balanced center of gravity can be kept favorably.

The invention discloses an exercise vehicle capable of being used as a bench press frame. The exercise vehicle comprises a vehicle body and a bench press frame structure detachably connected with thevehicle body. The bench press frame structure comprises a weightlifting supporting part and a load bearing frame, wherein the weightlifting supporting part is used for supporting the body of a user and arranged on the vehicle body and comprises a supporting seat and a supporting seat back fixedly connected with the supporting seat, the supporting seat is arranged on the vehicle body according to apreset inclination angle, and the included angle between the supporting seat and the supporting seat back is arranged according to a preset angle; and the load bearing frame is used for bearing a weightlifting instrument. Due to the arrangement of the bench press frame structure, the user can use the bench press frame structure to do weightlifting exercise through the weightlifting instrument placed on the load bearing frame under the supporting effect of the weightlifting supporting part, the bench press frame structure is detachably connected with the vehicle body of the exercise vehicle, and in combination with arrangement of an original exercise vehicle, the exercise vehicle is convenient to use and brings enjoyment and various types of experience for the user.

The invention discloses a harmonica rack suitable for guitar playing. The harmonica rack includes a harmonica rack device and a clamping device. The harmonica rack is characterized in that the clamping device comprises a U-shaped steel reed; a square plate is arranged on the upper reed of the U-shaped steel reed and is located at the center line of the U-shaped steel reed; the square plate is welded onto the upper reed along the length direction of the upper reed; a screwed hole is formed in the square plate along the length direction of the square plate; a screw rod is in fit connection with the screwed hole through a screw thread; an upper rubber layer is arranged below the upper reed; a lower rubber layer is arranged above the lower reed of the U-shaped steel reed; the U-shaped steel reed is inserted into and is clamped at a panel at one side where guitar sound holes are adjacent to a bass string; and therefore, a guitar and a harmonica can be played simultaneously. With the above structure adopted, the simultaneous playing of the guitar and the harmonica can be facilitated, and the maintaining of the balance of the centers of gravity of the guitar and the harmonica can be facilitated.

The present application discloses a forward and reward drivable electric tricycle. The forward and reward drivable electric tricycle includes a front vehicle body and a rear vehicle body, wherein a driving wheel is arranged at the bottom of the front vehicle body; the lower part of the front vehicle body is provided with a pedal for the driver to stand on; the front vehicle body is internally provided with a driving device capable of driving the driving wheel to forward rotate and reverse rotate; the power output end of the driving device is connected with the rotary shaft of the driving wheel; a first steering handlebar for controlling the steering of the front vehicle body in a pressing-down mode and a second steering handlebar for controlling the steering of the front vehicle body in apushing-forward mode are arranged at the top of the front vehicle body; the first steering handlebar is connected with the top of the main shaft through a press-down steering device; the second steering handlebar is connected with the top of the main shaft; and the bottom of the main shaft is connected with the driving wheel. The forward and reward drivable electric tricycle solves the technical problems of inconvenient steering and low handling flexibility of a tricycle in a narrow space.

The invention relates to an offshore movable wind power generation system. The offshore movable wind power generation system is characterized in that a movable power generation energy storage ship navigates to an offshore wind power plant anchorage and carries out anchoring power generation energy storage, and stores electric energy into an energy storage liquid of the movable power generation energy storage ship, the movable power generation energy storage ship which fully stores the energy navigates to a longshore energy storage liquid exchange pump station, and exchanges the energy storage liquid which fully stores the energy, with the energy storage liquid which does not store the energy through the energy storage liquid exchange pump station, and the energy storage liquid which fully stores the energy in the energy storage liquid exchange pump station is subjected to bidirectional exchange with a longshore converter station; and the longshore converter station uses the energy storage liquid which fully stores the energy for generating power and conveys the electric energy to a load centre through a power transmission and distribution system, and meanwhile, the longshore converter station returns the energy storage liquid which is already used for generating power to the energy storage liquid exchange pump station. The offshore movable wind power generation system disclosed by the invention is capable of conveying the electric energy to shore for utilization without the limit of an offshore distance by virtue of the characteristic that the energy storage liquid is capable of being subjected to long-distance transportation without energy losses; and meanwhile, the energy storage liquid is capable of being repeatedly used without damages.

The invention discloses a method for replenishing bags, which belongs to the technical field of packaging, and is characterized in that it comprises the following steps: a. First, detect multiple rows of material bags; b. If the material sequence is all empty, jump out and do nothing; c. In the first cycle, set the material sequence to be full and the feed slots of the waiting stations of the multi-column bag replenishing machine are all empty, and carry out the feeding action; d. In the next cycle, if there is a shortage of material in the bag replenishing slot , carry out replenishment action; if the replenishment bag trough is full, jump out without action; if the number of strip bags in the replenishment trough is greater than the number of empty bags in the replenishment trough, the replenishment action is still performed, several cycles Finally, if the number of strip bags in the feed tank to be replenished is less than the number of empty bags in the bag feed tank, the replenishment action is performed. The invention can ensure that in the next cycle, if there is no material bag in a bag replenishing trough, the bags in the trough to be replenished can always be replenished in time, and the whole bag replenishing process is smoother, thereby effectively improving the bag replenishment rate. efficiency.

The invention relates to a lifeboat with the anti-roll function. The lifeboat comprises a boat body, wherein a rotating seat is fixedly arranged on a boat edge of one side of the boat body, a turnover mechanism is rotationally arranged on the rotating seat and used for bearing and supporting a drowning person, a driving assembly is fixedly connected to one side of the turnover mechanism, a counterweight assembly is further fixedly arranged on the boat body, the driving assembly is used for controlling the turnover mechanism to turn over to lift a borne person falling into water and driving the counterweight assembly to horizontally move towards the other side, opposite to the turnover mechanism, of the ship body to keep the whole ship body balanced, and the turnover mechanism is further provided with an autorotation assembly; the self-rotation assembly is used for rotating the overturned overturning mechanism so as to cooperate with rescue workers on the ship body to lift out the person falling into water on the overturning mechanism, the self-rotation assembly is arranged to rotate so as to cooperate with the rescue workers to rescue the person falling into water on the overturning mechanism, and the overturning mechanism is in linkage fit with the counterweight assembly; the overall balance of the ship body during rescue is guaranteed, and the rescue process can be safely and efficiently carried out.

The invention discloses a transportation device for power detection equipment, and belongs to the technical field of power detection equipment transportation. The transportation device comprises a base, a rack, a transmission mechanism and a plurality of groups of bearing mechanisms. The rack is arranged above the base; the transmission mechanism is in transmission connection with the rack; the multiple groups of bearing mechanisms are in transmission connection with the transmission mechanism; and the multiple groups of bearing mechanisms are sequentially arranged from bottom to top. According to the transportation device, the multiple groups of bearing mechanisms do reciprocating motion in the preset direction, and the multiple groups of power detection equipment are fed and discharged from the bearing mechanisms at the same preset height during handling, and the multiple groups of power detection equipment can be carried in and out at the same preset height when being carried in or out of the bearing mechanisms by a worker separately; the preset height is suitable for the human body of the worker during working, and therefore the fatigue of the worker is reduced; and the handling efficiency is improved.

The invention discloses a kazoo rack for playing and singing of a guitar. The kazoo rack comprises a kazoo rack device and a clamping device, and is mainly characterized in that the upper end of a rack head is provided with a matched fastening ring with a gap, the fastening ring is formed by the bending of an elastic steel sheet, the inner side of the fastening ring is provided with a silica gel layer, the clamping device comprises a U-shaped steel reed, the center line above an upper reed of the U-shaped steel reed is provided with a square plate, the square plate is welded above the upper reed along the length direction, the square plate is provided with a threaded hole along the length direction, a screw rod is connected with the threaded hole via threads, an upper rubber layer is arranged under the upper reed, a lower rubber layer is arranged on a lower reed of the U-shaped steel reed, and the U-shaped steel reed is inserted and clamped on a panel of a guitar sound hole close to the side of a bass string so that simultaneous playing and singing of the guitar and a kazoo can be realized. According to the kazoo rack, simultaneous playing and singing of the guitar and the kazoo can be facilitated, and the balance of the center of gravity of the guitar and the kazoo can be maintained.

The invention relates to a intelligent multifunctional shifting machine base with a gravity center balance system, which relates to a medical rehabilitation auxiliary device component. Specifically, the base takes a battery as power, a mechanical structure employs a I-shaped frame, a side beam frame, and an electric differential caster, a gravity sensor is installed at the connection between the caster and the base, and the piezoelectric effect is applied to the collection, transmission and adjustment of the gravity information of the caster to maintain the balance of the gravity center of theshifting machine base. A control system adopts an AGV technology and is equipped with a magnetic or optical automatic guiding device and a Beidou global positioning terminal, and the intelligent shifting machine base that automatically travels, automatically resizes, and remotely operates is realized.

The invention discloses a climbing shoe. The climbing shoe is characterized by comprising a shoe fixing plate; one side of the shoe fixing plate is hinged to an overturning frame; a guide plate is fixedly arranged on the overturning frame and is used for guiding a rope from the front end of the guide plate into a rope groove which is formed vertically; a locking plate is arranged on one side of the guide plate and is hinged to the overturning frame; a locking block is arranged at one end of the locking plate; when a person climbs, the rope is guided into the rope groove through the opening in the front end of the guide plate; when the gravity of a human body is transmitted to the shoe fixing plate through the shoe and the person treads downwards, the overturning frame is driven to overturn upwards; the rope groove becomes inclined, the rope in the rope groove pushes the locking plate to overturn reversely, and the rope is locked by the locking block. According to the climbing shoe, a climbing action is performed by utilizing the treading force of a foot, and the problem of overexertion of hand parts during a climbing process is solved, so that wild climbing exercise, rescuing work and the like become easier.

The invention discloses a heavy-duty wall-climbing robot used for inspection of building exterior walls. The robot includes a first main body frame, a second main body frame, a transverse connection frame, a fan assembly, a power device, a pulley assembly, a flight control processor, The main controller and the wireless communication module; the first main body frame and the second main body frame are matched and connected through the transverse connection frame; the fan assembly is connected with the first main body frame, the second main body frame and the transverse connection frame, and the fan assembly is used to provide The thrust against gravity and the pressure facing the wall; the power unit is connected with the fan assembly, the flight control processor is connected with the power unit, and the master controller is connected with the wireless communication module and the flight control processor; the pulley assembly is set on the first On the main frame and the second main frame, the pulley assembly is attached to the wall during the inspection; the fan is used to provide the robot with a thrust against gravity and a pressure facing the wall, so that the robot can smoothly fly against the wall to be inspected. Keep your center of gravity balanced.

The invention relates to the field of structures of hydraulic hoists and relates to a hydraulic hoist with a balancing device. The hydraulic hoist comprises an oil cylinder. The balancing device is arranged under the oil cylinder and comprises two cylinder supports and a fixing base. The oil cylinder is supported by the cylinder supports. Contact faces of the oil cylinder and the cylinder supports are arc faces. The upper portion of the fixing base is connected with at least a pair of guide rods vertically arranged. The upper end of each guide rod penetrates the corresponding cylinder support and is connected with the same through a fixing nut. Each guide rod between each cylinder support and the fixing base is provided with a compressing spring and an adjusting nut. The compressing springs are arranged upon the corresponding adjusting nuts respectively. The adjusting nuts are in threaded connection with the corresponding guide rods. During mounting, the compressing springs are adjusted by the adjusting nuts to allow the hoist to stay in a horizontal state, and the nuts are fixed. Once a piston rod extends to run, the gravity center offsets, the upper ends of the guide rods are fixed to the fixing nuts, the lower plate seat is fixed, and the hydraulic hoist is integrally fixed.

The invention discloses a kazoo rack for the playing and singing of a guitar. The upper end of a rack head is provided with a fastening ring, the inner side of the fastening ring is provided with a silica gel layer, a clamping device comprises an upper clamping piece and a lower clamping piece, a square plate is arranged on the center line on the upper clamping piece, the square plate is provided with a threaded hole along the length direction, a screw rod is connected with the threaded hole in a cooperative manner via threads, an upper rubber layer and a lower rubber layer are respectively arranged under the upper clamping piece and on the lower clamping piece, the center line above an upper clamping handle is provided with a circular hole and a square hole communicated with the circular hole, the internal diameter of the circular hole is connected with the external diameter of a bearing, the internal diameter of the bearing is connected with the external diameter of a bolt head of a cross-head bolt, a lower clamping handle is a square structure matched with the square hole, the center line above the lower clamping handle is provided with a threaded hole, the lower part of the cross-head bolt is screwed into the threaded hole and rotates in an anticlockwise or clockwise manner, and the lower clamping piece is driven to move downwardly or upwardly via the lower clamping handle. According to the kazoo rack, simultaneous playing and singing of the guitar and the kazoo can be facilitated, and the balance of the center of gravity can be maintained.

The invention discloses a lifting cab and a tunnel boring machine. The lifting cab comprises a cab, a fixed bracket, a connecting rod assembly and a driving mechanism, wherein the fixed bracket is fixedly arranged behind the cab; the connecting rod assembly at least comprises a first connecting rod and a second connecting rod which are arranged in parallel; first ends of both the first connecting rod and the second connecting rod are connected with the cab; second ends of both the first connecting rod and the second connecting rod are hinged with the fixed bracket; the driving mechanism is used for driving the connecting rod assembly to rotate along the vertical face. According to the lifting cab provided by the invention, a lifting device is arranged behind the cab, so that the space in the horizontal direction is effectively utilized, the mounting height of the complete machine in the vertical direction is reduced when the effective lifting height is ensured, and the lifting cab is beneficial for ensuring balance of the gravity center of the complete machine; the number of required driving parts is small, which is beneficial for reducing equipment cost; moreover, the lifting device is arranged behind the cab, so that the lifting cab also has the advantage of convenience for repair.