105results about How to "Does not affect mobility" patented technology

The invention relates to a crossed three-dimensional torpedo interception net capable of intercepting torpedoes, especially a torpedo interception net which can be projected or cast and can outspread automatically when entering into the water to form a decussate three-dimensional torpedo interception net. The appearance is column-shaped, a top cover is arranged at the top part and is fixed and sleeved by bayonet locks on the casing which is divided into four sections, the specific density of the top part is lighter than the seawater and the specific density of the bottom part is heavier than the seawater. A decussate bracket is arranged inside, a telescopic link is connected on the lateral side, and a suspended net is connected with the telescopic link via a hanger. When the torpedo interception net is projected or cast into sea via a surface ship, a submarine or a helicopter, the top cover is ejected via a spring, the casing is opened, a going barren dives the telescopic link to expand and the suspended net is dragged to outspread in horizontally. Under the upward pulling force of the telescopic link and the downward pulling force of the weight of the connector of the suspended net, the suspended net is outspreaded along vertical direction; a stabilization membrane connected with the inner side of the suspended net control the stability of the torpedo interception net along the vertical direction.

The invention relates to a drawer-type power control cabinet assembly capable of dehumidifying, which comprises a control cabinet part (1), a drawer push-out part (5) and foot margins (25) fixed on a floor. The control cabinet part (1) and the drawer push-out part (5) are fixedly connected together; a plurality of power control drawer boxes (2) are arranged up and down in the control cabinet part (1); the drawer push-out part (5) are used for pushing out the power control drawer boxes (2) in the control cabinet part (1); the drawer push-out part (5) comprises a supporting body, a lifting driving part, a push-out driving part and a latch driving part; the lifting driving part comprises a lifting motor (4), a lifting driving screw (16) and a guide rod (15); and the lifting motor (4) is connected with the upper end of the lifting driving screw (16) so as to drive the lifting driving screw (16) to rotate.

The invention discloses a drawer type electric control cabinet assembly. The drawer type electric control cabinet assembly comprises a control cabinet part (1), a drawer pushing-out part (5) and a ground foot (25) fixed to a floor, wherein the control cabinet part (1) and the drawer pushing-out part (5) are fixedly connected together, multiple electric control drawer boxes (2) are arranged in the control cabinet part (1) with one above another, the drawer pushing-out part (5) is used for pushing out the electric control drawer boxes (2) in the control cabinet part (1) and comprises a supporting body, a lifting driving part, a pushing-out driving part and a locking driving part, the lifting driving part comprises a lifting motor (4), a lifting driving screw (16) and a guiding rod (15), and the lifting motor (4) is connected with the upper end of the lifting driving screw (16) and is used for driving the lifting driving screw (16) to rotate.

The invention discloses a second-level coal mine rescue robot system. The system comprises a detection robot and a carrying robot, wherein the detection robot detects related environmental information at a place where a coal mine accident occurs in real time; the carrying robot transports the detection robot to a place nearby the place where the coal mine accident occurs from the ground along the existing transportation channel which is formed in a coal mine underground tunnel and synchronously detects related environmental information in the coal mine underground tunnel in real time in the transportation process; and the carrying robot is a wheel robot and the detection robot is a crawler robot. The system has a reasonable design, high intelligentization degree and reliable working performance and is convenient to use and operate; and the carrying robot and the detection robot second-level robot system effectively solves the problems that: the underground conditions of a coal mine are severe, the place where the accident occurs is far away from a well head, the crawler rescue robot has a limited moving range and cannot effectively monitor the environmental information of the place where the accident occurs, and the like.

A drawer-type electric power control cabinet assembly with a position sensor comprises a control cabinet part (1), a drawer push-out part (5) and ground legs (25) fixed to a floor, wherein the control cabinet part (1) and the drawer push-out part (5) are fixedly connected together, a plurality of electric power control drawer boxes (2) which are arranged in an up-and-down mode are arranged in the control cabinet part (1), the drawer push-out part (5) is used for pushing out the electric power control drawer boxes (2) in the control cabinet part (1), the drawer push-out part comprises (5) a supporting body, a lifting driving part, a push-out driving part and a lock catch driving part, the lifting driving part comprises a lifting motor (4), a lifting driving screw (16) and a guiding rod (15), and the lifting motor (4) is connected with the upper end of the lifting driving screw (16) and used for driving the lifting driving screw (16) to rotate.

The embodiment of the invention provides a cell re-selection method for supporting multimedia broadcast services, equipment and a system, which relate to the field of communication. The problem that the continuity of MBMS services (multimedia broadcast multicast services) can not be ensured in a maximizing way when a plurality of cells meet a re-selection rule simultaneously is solved. The method comprises the following steps of: transmitting the frequency point information of cells to a terminal by a base station; receiving the frequency point information of the cells, which is transmitted by the base station, by the terminal and determining the frequency point priorities of a serving cell and adjacent cells according to the frequency point information; transmitting the service parameter of the serving cell and the re-selection parameters of the adjacent cells to the terminal by the base station; receiving the service parameter of the serving cell and the re-selection parameters of the adjacent cells, which are transmitted by the base station, by the terminal; and selecting a cell as the serving cell anew by the terminal. The embodiment of the invention is applied to the cell re-selection of multimedia broadcast services.

A drawer-type electric power control cabinet assembly with an alarming device and a position sensor comprises a control cabinet part (1), a drawer push-out part (5) and ground legs (25) fixed to a floor, wherein the control cabinet part (1) and the drawer push-out part (5) are fixedly connected together, a plurality of electric power control drawer boxes (2) which are arranged in an up-and-down mode are arranged in the control cabinet part (1), the drawer push-out part (5) is used for pushing out the electric power control drawer boxes (2) in the control cabinet part (1), the drawer push-out part (5) comprises a supporting body, a lifting driving part, a push-out driving part and a lock catch driving part, the lifting driving part comprises a lifting motor (4), a lifting driving screw (16) and a guiding rod (15), and the lifting motor (4) is connected with the upper end of the lifting driving screw (16) and used for driving the lifting driving screw (16) to rotate.

A region segmentation method for naturally placing grape bunch pedicel by machine vision is provided. A binocular vision system is constructed by adopting a multi-degree-of-freedom bracket, and that irradiation mode of diffuse reflective light source is designed to obtain grape bunch image, Then, the image is decomposed in HSI model, the circular convolution kernel with radius of 3 pixels is designed, the median filter is carried out pixel by pixel along the grape string image, and the LOG kernel function is used to sharpen the edge of the grape string image. Then, based on the distribution characteristics of grape edge region, the minimum distance between disconnected domains in the minimum neighborhood is used to represent the edge distance of grape, According to the distribution histogram of edge distance, the segmentation points of stem edge and kernel edge of grape bunch are obtained, and the morphological kernels of open and close are designed by using the segmentation points ofedge distance, and the morphological operation is carried out by using the adaptive convolution check image. Finally, the high precision and high efficiency segmentation of naturally placing grape bunch pedicel region is realized by machine vision.

A drawer type electric control cabinet assembly with the insect prevention function comprises a control cabinet part (1), a drawer pushing-out part (5) and ground feet (25) fixed to a floor, wherein the control cabinet part (1) and the drawer pushing-out part (5) are fixedly connected together, a plurality of electric control drawer boxes (2) are vertically arranged in the control cabinet part (1) from, and the drawer pushing-out part (5) is used for pushing out the electric control drawer boxes (2) in the control cabinet part (1). The drawer pushing-out part (5) comprises a supporting body, a lifting driving part, a pushing-out driving part and a lock catch driving part, the lifting driving part comprises a lifting motor (4), a lifting driving screw (16) and a guide rod (15), and the lifting motor (4) is connected with the upper end of the lifting driving screw (16) and used for driving the lifting driving screw (16) to rotate.

The invention relates to a high-speed water entry buffer head cap of an underwater vehicle. The high-speed water entry buffer head cap comprises an outer cover shell, a combined buffer piece and a combining piece. The outer cover shell is installed outside the whole buffering head cap, so that the aircraft has a good pneumatic head shape, the stability of the whole structure of the buffering headcap is guaranteed in the air flying stage; the buffering head cap can be integrally broken and disintegrated when entering water, and the movement performance of the aircraft in water is not affected.The combined buffer piece can isolate the impact when entering water to reduce and limit the water entering impact load acting on the aircraft. The combined buffer piece is a revolving body and bonded at the front end inside the cover shell, a groove is formed in the rear end of the buffer and completely wraps the head of the aircraft, and the combined surface of the combined buffer piece and thebuffer serves as a supporting surface and a supporting point for combining the aircraft and the head cap. A connecting piece adopts a spring clamp device to guarantee firm and reliable connection between the aircraft and the buffer head cap, and resistance to disengagement loads of the aircraft in various mechanical environments such as impact, vibration and external loads in the carrying and running process is realized.

A drawer type electric control cabinet assembly with the dust removal and heat dissipation functions comprises a control cabinet part (1), a drawer pushing-out part (5) and ground feet (25) fixed to a floor, wherein the control cabinet part (1) and the drawer pushing-out part (5) are fixedly connected together, a plurality of electric control drawer boxes (2) are vertically arranged in the control cabinet part (1), and the drawer pushing-out part (5) is used for pushing out the electric control drawer boxes (2) in the control cabinet part (1). The drawer pushing-out part (5) comprises a supporting body, a lifting driving part, a pushing-out driving part and a lock catch driving part, the lifting driving part comprises a lifting motor (4), a lifting driving screw (16) and a guide rod (15), and the lifting motor (4) is connected with the upper end of the lifting driving screw (16) and used for driving the lifting driving screw (16) to rotate.

The invention relates to a control system of a drawer type electric control cabinet assembly with a position sensor. The control system includes a controller, a motor driving circuit, a drawer type electric control cabinet assembly and a position sensor; the drawer type electric control cabinet assembly includes a control cabinet part, a drawer push-out part and ground feet fixed on floor; the control cabinet part and the drawer pull-out part are fixedly connected together; a plurality of electric control drawer boxes which are arranged in an up-down manner are located in the control cabinet part; the drawer push-out part is used for pushing out the electric control drawer boxes in the control cabinet part; the drawer push-out part comprises a supporting body, a lifting driving portion, a push-out driving portion and a locking driving portion; the lifting driving portion comprises a lifting motor, a lifting driving screw and a guide bar; and the lifting motor is connected with the upper end of the lifting driving screw, and is used for driving the lifting driving screw to rotate.

A front section of a motor vehicle body comprises a bumper (3) and a bumper bracket (9) which are designed to retreat during a collision while absorbing energy and momentum, an air passage (6) and a sealing element (15) situated behind the bumper for modulating the throughput of the fresh air passage and capable of being dragged along by the retreating bumper (3) or bumper bracket (9), and a gap (22)arranged upstream from the sealing element (15) and allowing the bumper (3) and bumper bracket (9) to retreat without simultaneously taking the sealing element (15) with it.

The invention discloses a multifunctional physical exercise device, which comprises a base plate, a fixing mechanism, a power mechanism, a massage mechanism, an upper limb exercise mechanism, a lowerlimb exercise mechanism, a transmission mechanism and an auxiliary mechanism. Left and right sides of the bottom of the base plate are symmetrically equipped with pedestals, and the bottom of the pedestal is provided with a mobile wheel; the bottom inside the base plate is provided with a mounting groove 1; the lower part inside the mounting groove 1 is provided with the fixing mechanism; the upper part inside the mounting groove 1 is provided with the massage mechanism; the right end inside the mounting groove 1 is provided with the power mechanism; and the power mechanism provides a power source for the fixing mechanism and the massage mechanism. When the device of the invention is in use, the transmission mechanism drives a fan blade in the auxiliary mechanism to rotate while a user takes exercise through the lower limb exercise mechanism. Thereby, cool wind is generated, and the power source is from the exerciser. The exercise effect is achieved, and comfort level of the exerciseris also improved during the exercise, thus killing two birds with one stone. Meanwhile, a display screen can provide music, video and the like for the exercise to watch, and then fatigue of the exerciser is relieved.

The invention provides a controllable mechanical floating-arm-type water hyacinth surrounding device. The controllable mechanical floating-arm-type water hyacinth surrounding device comprises a control system, interception net bodies and mechanical arms, wherein the mechanical arms are installed on bases on the two sides of the front portion of a fishing boat in a hinged manner respectively; the mechanical arms penetrate the centers of the corresponding interception net bodies, and each mechanical arm comprises a first-level arm and a second-level arm; one end of each first-level arm is hinged to the corresponding base through a rotational joint, and the other end of the first-level arm is connected with the corresponding second-level arm through a rotational joint; the tail end of each second-level arm is provided with a rotary harrow which can be driven by a motor to deflect towards the inner side, and the rotational joint between each first-level arm and the corresponding second-level arm and the tail end of each second-level arm are each equipped with a two-way motor propeller; and free moving of the interception net bodies in the water and surrounding of water hyacinth are achieved by controlling the output power and the driving direction of the two-way motor propellers through the control system. By means of the controllable mechanical floating-arm-type water hyacinth surrounding device, rapid surrounding of floating water hyacinth groups can be achieved, and the efficiency of removing operation is improved.

The invention discloses an anti-caving supporting frame for underground work. The anti-caving supporting frame for the underground work comprises a bottom supporting plate and a top supporting plate.A high-pressure liquid supporting principle and a lever principle are used, the top supporting plate is enabled to be located in a trend of one side moving upwards, so that the side of the top supporting plate is more closer to the work surface, effective supporting strength is higher, boundedness is small, and safety performance is better; the anti-caving supporting frame for the underground workis provided with a spiral spring conflicting type maximum liquid strength control mechanism, and occurrence of a phenomenon of part damage caused by excessive pressure is prevented; in addition, theanti-caving supporting frame for the underground work is provided with a piston seal type liquid pressure drive mechanism, and directional drive is realized under the action of liquid; and the anti-caving supporting frame for the underground work is provided with a spherical size structure limiting type part connecting structure, two parts can be connected, and meanwhile, activity of the two partsin a connecting part cannot be affected.

The invention relates to a machining center lubricity test system and an optimization method and belongs to the field of testing of machining center lubrication systems. Thermosensitive parts of a spindle system and a feed system are identified by thermal imaging testing of the spindle system and the feed system, and temperature sensors are mounted at the thermosensitive parts. A test system of a machining center lubrication system is set up; the lubrication amount is adjusted by adjusting a lubrication time interval of a machining center; the spindle system and the feed system of the machining center move continuously in different lubrication amount states; and simultaneously, temperature data at the thermosensitive parts is acquired. The lubrication amount of the spindle system and the feed system of the machining center is optimized based on temperature rises of the thermosensitive parts. The invention provides the test system and the optimization method for optimizing the lubrication amount of the machining center lubrication system; the problem of unreasonable lubrication amount setting of the machining center lubrication system at present is solved; the movement performance of a machine tool can be improved; the use cost of the machine tool is lowered; and the pollution of lubricating oil is reduced.

The invention discloses a movable electro-hydraulic composite drive spraying robot with a large working space. The movable electro-hydraulic composite drive spraying robot comprises a plurality of movable bases, the movable bases are matched with one another and are used for bearing drive rope adjusting modules, profile struts in the drive rope adjusting modules are respectively fixed on the movable bases, an operation space is defined by the multiple movable bases, a movable adjustable auxiliary motion platform is erected in the operation space, a rotary motion platform is arranged below the adjustable auxiliary motion platform, the adjustable auxiliary motion platform is connected with the rotary motion platform through a hydraulic push rod, a spray gun is installed on the bottom end face of the rotary motion platform, and a balance mechanism and a fixed supporting mechanism which are used for balancing the traction force of a rope and maintaining the balance of the mechanism are further installed on the movable bases. The movable electro-hydraulic composite drive spraying robot is reasonable in structural design, multi-degree-of-freedom movement in a large working space is achieved, meanwhile, interference between a traction rope and a machined workpiece is avoided, and the applicability of equipment is improved.

The invention relates to a positive pole current collector of a lithium ion battery. The current collector is of a three-layer structure, wherein the first layer and the third layer are made of aluminum and have the thickness of 2.5-3 microns; the second layer arranged between the first layer and the third layer is an aluminum alloy layer and has the thickness of 8-10 microns; and the aluminum alloy comprises the following components in percentage by mass: 0.4-0.45 percent of Si, 0.4-0.45 percent of Fe, 0.06-0.08 percent of Cu, 0.5-0.6 percent of Mn, 0.05-0.08 percent of Ca, 0.01-0.015 percent of Sb, 0.1-0.15 percent of Ti-B alloy, 0.45-0.6 percent of RE, 15-20 percent of La, 55-60 percent of Ce, 10-15 percent of Er, 10-15 percent of Sm and the balance of aluminum and inevitable impurities, wherein RE refers to mixture rare earths. The preparation method comprises the following steps: smelting, performing homogenizing treatment, cold rolling and performing two-stage aging. According to the positive pole current collector disclosed by the invention, the tensile strength can be 260-275MPa, a corrosive pitting phenomenon is avoided, and compared with an aluminum foil in the prior art, the positive pole current collector has the advantage that problems of wrinkle and breakage can be effectively solved on the basis that a certain aluminum foil thickness is guaranteed.

The invention discloses a handheld mowing machine. The handheld mowing machine comprises an upper cover, a lower cover, wheels, a height adjusting mechanism, a mowing mechanism, a drive device, a spherical rotating part, an upper connecting rod and a lower connecting rod, wherein the lower cover is arranged below the upper cover, the wheels are arranged on the lower cover, the upper cover and thelower cover are connected through the height adjusting mechanism, the mowing mechanism is arranged inside the lower cover, the drive device is connected with the mowing mechanism, the spherical rotating part is arranged above the upper cover and rotatably connected with the lower connecting rod, and the upper connecting rod is arranged at the upper end of the lower connecting rod. The handheld mowing machine has the advantages that the angle of the spherical rotating part relative to the lower connecting rod can be controlled, the wheels can support the handheld mowing machine, the wheels arecoordinated with the rotating part to provide support points to complete eccentric rotation, and a mowing head is constantly parallel with the ground and the height between the mowing head and the ground can be controlled by the aid of the wheels, the rotating part and the height adjusting mechanism.

A hydraulic opening four-link type top cap device comprises a compartment. The rear end of the compartment is provided with a rear door, the top of the compartment is provided with an overturning top cap, the front and rear sides of the compartment are provided with top cap overturning devices which comprise front overturning arms and rear overturning arms, the upper ends of the front overturning arms and the rear overturning arms are connected with the side edge of the top cap through revolving axles, the lower ends of the front overturning arms and the rear overturning arms are connected with the compartment through revolving axles, overturning oil cylinders are arranged on the outer side of the rear end of the compartment, telescopic rods in the overturning oil cylinders are hinged to the rear overturning arms through joints, overturning positioning blocks are arranged on the side edge of the top cap, the front overturning arms are provided with support blocks at the positions corresponding to the overturning positioning blocks, and after the top cap is overturned through the top cap overturning devices, the overturning positioning blocks and the support blocks are mutually matched to limit the overturned top cap, to make the top cap to be positioned above the cab. The device is simple in debugging, high in reliability, good in stability, convenient to install and use and easy in maintenance.

The invention discloses a flexible joint angle sensor, and relates to a joint angle sensor. The flexible joint angle sensor is used for solving the problem of high detection errors of an inertia sensor detection method and a video detection method which are used as human posture measuring means at present. The flexible joint angle sensor is characterized in that the upper end of a flexible corrugated pipe is connected with a fixing ring, the lower end of the flexible corrugated pipe is connected with a lower fixing block, three steel wire sliding tracks are circumferentially and uniformly distributed at each crest on the flexible corrugated pipe, the multiple steel wire sliding tracks which are arranged along the direction of a generating line of the surface of the flexible corrugated pipe are vertically opposite to one another, the fixing ring is of a hollow structure, a center hole is formed in the center of the upper end surface of the fixing ring, three upper through holes are formed in the lower end surface of the fixing ring, three lower through holes are formed in the lower fixing block, a steel wire harness comprising three steel wires is arranged in the center hole, the upper end of the steel wire harness penetrates an upper fixing block, and the lower ends of the three steel wires respectively penetrate the three upper through holes, pass through each three corresponding steel wire sliding tracks, respectively penetrate the three lower through holes and then are connected with displacement sensors. The flexible joint angle sensor is used for measuring postures of organisms.

The invention discloses a novel ankle joint rehabilitation parallel mechanism. The mechanism comprises a static platform, a movable platform, two UPU branched chains and an AABA-type branched chain; the parallel mechanism is provided with two non-coincident rotary spherical centers which are respectively a fixed spherical center and a movable spherical center; the whole parallel mechanism is regarded as that the movable spherical center performs spherical motion with two degrees of freedom around the fixed spherical center, and the movable platform performs spherical motion with one degree offreedom around the movable spherical center under the constraint of the three branched chains; rotation axes of rotary pairs respectively between the three branched chains and the static platform meetat a point which is the fixed spherical center of the parallel mechanism; rotation axes of rotary pairs respectively between the three branched chains and the movable platform meet at a point which is the movable spherical center of the parallel mechanism; each UPU branched chain is provided with a moving pair along the length direction of the UPU branched chain; the two UPU branched chains control the positions of the fixed spherical center and the movable spherical center in space; and a B-type connecting rod in the AABA-type branched chain controls the distance between the fixed sphericalcenter and the movable spherical center. The parallel mechanism has the advantages of lower manufacturing, processing and assembling precision, simpler and more compact structure and lower cost.

The invention discloses a pneumatic cleaning robot for a glass curtain wall and belongs to the field of wall climbing robots. The pneumatic cleaning robot for the glass curtain wall is completely controlled by air cylinders to achieve wall climbing and cleaning motion, a walking mechanism of the robot is formed by connecting four walking assemblies through four walking air cylinders end to end, incooperation with suction and release motion of suction cups on the walking assemblies and through retractable motion of every two opposite walking air cylinders, the cleaning robot for the glass curtain wall stably moves in the horizontal and vertical directions, and the walking mechanism is simpler and more compact in structure, flexible and convenient to operate and higher in working efficiency; the walking assemblies generate vacuum negative pressure on the suction cups by using air pumping air cylinders, the amount of air required by each air pumping air cylinder is small, the requirementfor air pumps is low, the actual operability and practicability are better, the suction cups are connected with the air pumping air cylinders one to one, air leakage of a certain suction cup cannot influence the whole walking mechanism, and the robot is safer and more reliable.

The invention discloses an expandable sliding sleeve type photoelectric surrounding view detecting buoy carried on an underwater carrier and a detecting method of the expandable sliding sleeve type photoelectric surrounding view detecting buoy. The expandable sliding sleeve type photoelectric surrounding view detecting buoy carried on the underwater carrier can reinforce the stealthiness of remoteenvironment situation real-time perception of the underwater carrier and increase / improve the detecting distance and positioning accuracy of the underwater carrier for a water surface target and an aerial target. The buoy achieves real-time two-way communication with a UUV through optical fibers, can obtain the environment situation of a water area where the buoy is located, passes surrounding view reconnaissance images back to the UUV, can extract the target within visible light or infrared wave sections from water surface and aerial background images, real-timely resolves the azimuthal angle and pitching angle of the target under the ENU coordinate system relative to the UUV by utilizing the three-dimensional attitude angle of the photoelectric surrounding view detecting buoy, the rotary angle of an azimuthal mechanism, the rotary angle of a pitching mechanism and the transverse and longitudinal video deviation quantity of the target, and uploads the azimuthal angle and pitching angle to the UUV through an optical fiber transmission module. The photoelectric detecting distanceand guiding accuracy are improved by an order magnitude compared with traditional sonar.

The invention a drawer type power control cabinet assembly with a lighting device. The drawer type power control cabinet assembly comprises a control cabinet part (1), a drawer push-out part (5) and feet (25) fixed on the floor, wherein the control cabinet part (1) is fixedly connected with the drawer push-out part (5); a plurality of power control drawer boxes (2) placed up and down are arranged in the control cabinet part (1); the drawer push-out part (5) is used for pushing out the power control drawer boxes (2) in the control cabinet part (1); the drawer push-out part (5) comprises a supporting body, a lifting drive part, a push-out drive part and a locking drive part; the lifting drive part comprises a lifting motor (4), a lifting driving screw (16) and a guide rod (15); the lifting motor (4) is connected with the upper end of the lifting driving screw (16) and used for driving the lifting driving screw (16) to rotate.

The invention relates to a motorcycle engine electrical starting structure comprising a starting motor. The starting motor is connected with a crankshaft through a large duplicate gear, a small duplicate gear, a clutch starting gear and an overrun clutch sequentially. The large duplicate gear comprises a rotary shaft. The rotary shaft is provided with a large gear, a transmission gear and a smallgear. The large gear and the rotary shaft rotate synchronously. The small gear can rotate relative to the rotary shaft. The transmission gear is in matched connection with a corresponding outer spiralspline section on the rotary shaft through an inner spiral spline groove and can move in the rotation direction of the outer spiral spline. The transmission gear is next to the small gear, and spaceis reserved between the transmission gear and the small gear in the axial direction, the opposite end faces of the transmission gear and the small gear are provided end face teeth which can mesh witheach other, and a return elastic mechanism is further arranged between the transmission gear and the small gear. An elastic rotation braking mechanism providing friction rotation braking force for thetransmission gear is further included. Normal electrical starting can be ensured, meanwhile when electrical starting fails or flameout occurs suddenly in the driving process, the conditions that thestarting motor and transmission parts are damaged by crankshaft reverse rotation and reverse impact can be prevented, and the electrical starting structure is protected effectively.

The invention provides a power supply system of a gantry crane. The system comprises a battery pack used for driving a first motor of a cart running gear, a second motor of a dolly running gear, a third motor of a lifting mechanism, and other electrical systems of the gantry crane. According to a technical scheme of the invention, the battery is used to supply power for the gantry crane, thereby increasing mobility of the gantry crane, getting rid of dependence on diesel and reducing energy consumption. The invention further provides the gantry crane using such power supply system.

The invention provides a head protection cover, relates to a device for protecting a head, and solves the problem of influence on the activity and comfort of people, of a protection device in the prior art. The head protection cover comprises an air supply device, and rectification devices located at the two sides of the head, wherein the air supply device provides pressure air flow for the rectification devices; each rectification device comprises an intake port and an exhaust port; each exhaust port is radially formed from the center to the surrounding of the head; air flow sprayed from theexhaust ports of the two rectification devices at the two sides of the head forms an air curtain cover surrounding the head; and air flow of an air curtain is capable of effectively protecting the other parts of the head while providing clean air for breathing, so that the head is prevented from being exposed to air containing hazardous substances. In this way, the air curtain does not influence the activity of a wearer; and the head protection cover is breathable, free from influence on sight line, and comfortable in experience.