58results about How to "Reduce ground pressure" patented technology

A system for adjusting the compliance of a wheel is provided. In one embodiment, wheel segments are adjusted, causing the stiffness of the wheel to change. Such adjustments can be made while the wheel is rotating, allowing the wheel compliance to be changed while a vehicle is in motion.

A vertical or short takeoff and landing (V / STOL) airplane is described having a vertical form factor. Making the airplane tall has many advantages when operating in hover mode close to the ground. Several variations of the design are described. The preferred embodiment consists of two tall fuselage2 structures having an airfoil shape in plan view. As high above the ground as practical a “lift wing” spans the space between these fuselages. This wing may be equipped with lift augmentation systems to facilitate V / STOL flight. In the center of the span on the leading edge of the lift wing is placed a turboprop engine. Alternatively, the wing and attached engine can be made to tilt about a horizontal axis. For takeoff the wing will be tilted skyward. A second wing slightly below and behind the lift wing has a pusher engine located on the trailing edge. This lower wing and engine is also able to tilt about a horizontal axis parallel to the lift wing. During takeoff this lower engine is pointed downward toward the ground. This lower wing contains aerodynamic control surfaces to provide attitude and position control. Subsequent to liftoff the wings and engines tilt into a horizontal position to provide cruise lift and thrust. At the end of the flight the wings and attached engines are tilted back to provide vertical lift for hover, maneuvering, and soft landing. 2 “Fuselage” is used here even though it substantially differs from the conventional fuselage (and its French origins meaning, “spindle shaped”) since in plan view it is an airfoil shape of large thickness. It will be used here for lack of a better word. Think of fuselage as meaning “where the pilot, passengers and cargo are located”.

The invention discloses a construction process of four-fold tube stratum decompression type double liquid jet grouting in the construction project technology field, which comprises the following steps that firstly forming a drilling lance boom with four-fold coaxial steel tubes, arranging passages in the inner portion of a multifunctional injector, which is relative to the four-fold tube of the drilling lance boom, installing two nozzles on the upper portion and the lower portion of the lateral side of the injector, secondly positioning, thirdly drilling holes, fourthly conducting jet grouting and injecting plaster, coaxially spraying compressed air and high-pressure cement plaster by the nozzles on the upper portion of the injector, and coaxially spraying high-pressure cement plaster and low-pressure accelerator serum by nozzles on the lower portion of the injector, wherein the low-pressure serum is externally coated on the high-pressure cement plaster, which are mixed with earth at the moment of being sprayed out in order to fast solidify soft ground, and fifthly conducting jet grouting to the design height, closing the valve for transporting fluid, and shifting a driller. The construction process solves the problems that the jet grouting solidification is hard to be conducted under the station of underground water flowing and jet grouting pile with large diameter and horizontal jet grouting solidification are hard to form. The invention reduces pressure for stratum through absorbing out waster mud water in the drilling and jet grouting process, and reduces the affect to the periphery.

Steering assemblies, methods and systems for powered or engine driven tandem axles used with work vehicles. A heavy duty work vehicle for rough terrain includes a tandem axle wherein engine power is transferred equally to both the front and rear ground following wheels of the tandem axle thru knuckle spindle steerable ends. A fluid system such as a hydraulic system unilaterally can control all four wheels or ground engagement tire positions of a single dual beam tandem or bogie assembly.

A lifting apparatus includes a plurality of preferably four carriages, each carriage supporting a lifting boom. Two booms are pinned together to define a first pair, a second two booms being pinned together to define a second pair. Each pair of booms and connected carriages are placed on a preferably common travel path. Rigging can include a horizontal beam that extends between the first pair of booms and the second pair of booms. The beam can be attached to the pinned connection of each pair of booms with a sling. A powered motor-driven winch is used to power a cable that is wound between sheaves on the lower end portions of a pair of booms that are connected together. During use, the winches are simultaneously or nearly simultaneously operated to elevate the first pair of the booms and the second pair of booms at about the same time. The horizontal beam that spans in between booms is elevated. Packages can be lifted with the horizontal beam by depending one or more slings from the horizontal beam to the package to be lifted. The apparatus can use carriages that are provided with wheels that travel on rails. Carriages can use rubber tires, or can be sled or skid-mounted without the use of wheels or tires.

The invention discloses a non-pillar sublevel mining cemented filling mining method. The method is characterized in that sublevels are used as stoping units; stoping drifts are arranged in a staggered way in upper and lower sublevels; rhombic components are stoped in a sublevel mining way; the paces are the basic stoping units; deep hole breakdown is performed in upward fan shapes; multi-row hole short-delay blasting is performed; ore removal is performed under the barnyard condition; after the mining, the cemented filling is performed in time; and rhombic cushions capable of being cyclically used for filling partition wall reserved blasting compensation spaces, blasting free surfaces and the like of the partition wall are used, so that a series of problems of complicated and expatiatory production process, low mining efficiency, high mining cost and the like of the existing top slicing horizontal stoping drift cemented filling mining method can be solved under the condition of steeply-inclined large and thick ore bodies.

A track for a tracked vehicle has a front idler wheel carried on a frame and a front double roller member carried on the frame construction rearward of the front idler wheel. The front idler wheel and the roller member are independently pivotally mounted on the frame by pivotal levers for upward and downward suspension movement in response to change in ground level. An actuating lever extends rearwardly from the front idler wheel over the pivotal lever of the double roller and a gas bag spring is located between the actuating lever and the double roller to absorb some upward movement of the front idler wheel so as to avoid transfer of a proportional downward movement to the roller member.

A system for adjusting the compliance of a wheel is provided. In one embodiment, wheel segments are adjusted, causing the stiffness of the wheel to change. Such adjustments can be made while the wheel is rotating, allowing the wheel compliance to be changed while a vehicle is in motion.

A “Torsional Suspensioned, Steerable, Oscillating and Propelling Axle Assembly” utilized in the individual track units of a multi track unit all-terrain vehicle or machine with said axle assemblies providing / enabling suspension, steering, oscillation and propelling functions of the track units of the all-terrain vehicle or machine.

The invention provides a hydraulic system for controlling a tail gate of a pavement milling machine. The hydraulic system comprises an overflow valve, an electromagnetic overflow valve, a first two-position four-way electromagnetic reversing valve, a second two-position four-way electromagnetic reversing valve, a first normally-closed two-position two-way electromagnetic reversing ball valve, a second normally-closed two-position two-way electromagnetic reversing ball valve, a three-position four-way electromagnetic reversing valve, a conveying motor of a belt conveyor, a fixed pressure reducing valve and a tail gate lifting oil cylinder. The hydraulic system has the advantages that the technical scheme is adopted, so that the operating quality of the milling machine is improved, the energy consumption is reduced, the performance is reliable, the structure is simple, the cost is cheap, lifting, locking, floating and back pressure functions of the tail gate can be achieved, the whole weight of the tail gate and a conveying device is grounded, pressure oil is fed into a rod cavity of the tail gate lifting oil cylinder to reduce the ground pressing of the tail gate, the ground pressing can be adjusted according to pavement conditions, the construction quality is guaranteed, the energy consumption is effectively reduced, and the operation is convenient.

The pneumatic tire has the characteristics in that the pneumatic tire is provided with a plurality of main grooves 1 extending in the tire circumferential direction formed on a tread T, a rib 2 formed at least on the shoulder portion of the tread T, a first fine groove 3 extending in the tire circumferential direction formed on the inner side of the tire width direction than a grounding end E, and the thin rib 4 formed by the first fine groove 3 and the grounding end E, wherein a second fine groove 5 is formed on the outer side of the tire width direction than the grounding end E, the second fine groove 5 is on the outer side of the tire width direction than a virtual surface S1 that passes the grounding end E and is vertical to the tire rotational axis.

The invention discloses a C30 slope-protection brick mixture ratio based on sandy spoil in navigation projects and a preparation method of the slope-protection brick. The C30 slope-protection brick comprises the following raw materials in parts by mass: 9-18 parts of cement, 55-70 parts of sandy spoil, 7-13 parts of mineral powder, 0.8-3.5 parts of plaster, 0.4-2 parts of an enhancer and 9-12 parts of water. The preparation method comprises the following steps: after the raw materials are fully and evenly mixed according to the ratio, injecting the mixture into a prefabricated mold, molding under the working pressure of 20MPa, enabling a molded test specimen to be demolded immediately, and placing the demolded test specimen indoors for natural watering maintenance to obtain the sandy-spoil-based slope-protection brick. The cube test specimen strength of the sandy-spoil-based slope-protection brick can reach C30, and the cube test specimen can replace a concrete material to be used for preparing the slope-protection brick and other hydraulic engineering materials. The sandy spoil is reasonably utilized, so that the transferring and ground pressing of spoil and the adverse effects on the environment in channel improvement are reduced, and the field of resource utilization of sandy spoil curing products is expanded.

A self-propelled harvesting machine includes a front harvesting attachment, a ground drive with first and second drive shafts offset relative to the front harvesting attachment, first and second track roller units to which first and second drive shafts are drivably connected and which extend on both sides of the harvesting machine and a rear axle having rear wheels that are steered via a steering mechanism provided in a rear region of the harvesting machine. The first and second drive shafts are driven by separate first and second hydraulic motors of a hydrostatic transmission. A displacement volume of each of the first and second hydraulic motors is changed depending on a steering movement transferred from the steering mechanism to the rear wheels, realizing an additional moment about a vertical axis of the harvesting machine simultaneously with the steering of the rear wheels.

The invention discloses a frame-type mining method. The frame-type mining method comprises the following steps that a, a bottom roadway is formed at the bottom of an ore block; b, a concrete false bottom extending horizontally is constructed in the bottom roadway, and draw shafts extending up and down are supported on the concrete false bottom; c, a courtyard extending up and down is formed in theore block, and human-crossing roads extending up and down are arranged on the outer sides of the concrete false bottom; d, the bottom of the ore block is subjected to underholing blasting ore breaking and mineral processing in sequence, and obtained ore blocks after mineral processing is put in ore drawing space through draw shafts; e, after the human-crossing roads and draw shafts are subject toupward supporting, and the upper part of the concrete false bottom is filled with filling materials and / or the obtained ore blocks after mineral processing to from filling space; f, first plain concrete columns extending up and down are constructed on the sides, close to the draw shafts, of the human-crossing roads, and second plain concrete columns extending up and down are constructed in the filling space; and the step d to the step f are repeated until mining of ore blocks are finished, and a concrete roof is constructed at the top of the filling space. The frame-type mining method can reasonably control ground pressure, pressing-hanging sides are reduced, and the stope working environment is improved.

A supporting arrangement for an agricultural working machine with at least one receiving device for receiving an agricultural working device has at least one support wheel arrangeable in a region facing the agricultural working device, the at least one support wheel being arranged forwardly of the at least one land wheel of an axle of the agricultural working machine as considered in a traveling direction, and a common envelope structure surrounding the at least one support wheel and the at least one land wheel located after the at least one support wheel as considered in the traveling direction.

A pneumatic tire has a narrow groove extending in a tire circumferential direction. The narrow groove being formed in a shoulder land portion of a tread. An inside concave curved surface and an outside concave curved surface are formed in a groove bottom port ion of the narrow groove. The inside concave curved surface is obtained by depressing a groove wall in a tread center side. The outside concave curved surface is obtained by depressing a groove wall in a tread end side. The groove bottom, portion of the narrow groove is provided as a shape which is wider than an opening portion of the narrow groove and is rounded. A height of the inside concave curved surf ace measured along a depth direction of the narrow groove is greater than a height of the outside concave curved surface.

A process of reinforcing underground supercharged expansion pipe mainly solves the problem that the existing processes of reinforcing expansion tube are dangerous due to high pressure on the ground pump and increases the labour intensity due to the delivery of special pipe column. The process is characterized in that a process tube (6) connected with an underground supercharger (5) on the upper end thereof is delivered in the well, and a deliver oil pipe (4) delivers the underground supercharger (5) and other pipe columns thereunder to the predetermined depth; a ground pump (1) bulges; the underground supercharger (5) converts the low-pressure liquid into the high-pressure liquid to be transported to an expansion pipe (11) which is expanded overall to cling to the inner wall of a broken casing (12), and then releases to take out other kits except for the expansion pipe (11). In the invention, the ground supercharger is avoided to reduce the ground construction pressure, increase the safety for operators, and the labour intensity is reduced through the deliver by using the original production pipe columns.

A subsea carrier (100) for transporting a fluid, e.g. CNG or crude, comprises a main body (101) for containing the fluid at a predetermined internal pressure, wherein the main body (101) preferably is made of concrete and designed to operate at a water depth where the external pressure substantially counteracts the internal pressure. The subsea carrier has a floating element (102) connected to the main body (101) by a stabilising cable (132), wherein the stabilising cable (132) comprises a first rope (321) for transmitting force and is attached to a first connector (134) that is movable with respect to the main body (101). A system wherein the subsea carrier is towed by a surface vessel (3) or is self-propelled and controlled remotely is also disclosed. The subsea carrier (100) reduces operational costs relative to subsea carriers with traditional control surfaces and ballasting systems at large cargo volumes, e.g. 150 000 m3 or more.

A pair of rake wheels in an assembly is referred to as a center splitter assembly. Each rake wheel is configured for free-rotation, meaning it is powered by contacting the ground. The center splitter is used to separate material, each wheel moving material in a different direction. The rake wheel on the left side of the center splitter assembly will rotate in a clockwise direction, as viewed from behind the wheel, which will cause the material to move from the right to the left. The opposite applies to the rake wheel on the right side of the center splitter assembly, where it will rotate counter-clockwise, moving material from the left to the right. Since these rake wheels are attempting to move material in opposite directions, the spacing between the wheels has been found to be critical.

The invention discloses a salinized soil sampling device based on remote sensing and a sampling method thereof. The salinized soil sampling device comprises a vehicle body, four storage batteries arefixedly connected to the inner side wall of the vehicle body, a signal transceiver is fixedly connected to the inner side wall of the vehicle body, two servo motors are symmetrically and fixedly connected to the inner side wall of the vehicle body, the output shafts of the servo motors are fixedly connected with inducers, eight loading wheels are symmetrically hinged to the two side faces of the vehicle body, and the outer surfaces of the inducers and the loading wheels are meshed with track shoes. Remote sensing is provided for all electrical elements through the signal transceiver, a cameraand a laser range finder are matched with a GPS positioner to feed back real-time driving data to background workers, meanwhile a second motor, a third motor and a fourth motor are matched with a first mechanical arm, a second mechanical arm and a fixing support to drive sampling mechanisms such as an electric push rod and a drill rod to conduct soil drilling and sampling, in the period, a workercan remotely control the motors through the background to meet the requirement for sampling at different angles and depths, and the research requirements are met.

The invention relates to the technical field of tunnel construction, in particular to a trestle with a postpositive drive and a method of installing and adjusting. The trestle with the postpositive drive includes a main bridge which is arranged on a support surface, and the included angle between the bridge face of the main bridge and the support surface is sharp. The front and rear ends of the main bridge are correspondingly connected with a front approach bridge and a rear approach bridge. The front approach bridge includes an inclined section and a horizontal section, and the included anglebetween the bridge face of the inclined section and a horizontal face is sharp. The horizontal section is connected with the main bridge, and the length of the front approach bridge is longer than the length of the main bridge. The overall structural form of the existing trestle is changed, the length of the front approach bridge is greatly increased, and the length of the rear approach bridge isshortened. Therefore the construction area scope of paving an inverted arch template and pouring concrete is enlarged, the construction space is become spaciously, and the construction efficiency isfurther improved by ensuring that a construction vehicle can pass through the trestle smoothly and safely.

The invention relates to a cropper chassis of a type similar to the type of an automobile, and is an agricultural machine. A majority of current cropper chassis have machines weighing on a driving wheel and an oversized pressure to the ground, thus being beneficial to the protection of the surface of the arable land; when a shift-region operation is carried out, as a directive wheel is not provided with a braking, the shift-region speed is limited, thus reducing the safety property of the braking. The invention provides a cropper chassis a type similar to the type of an automobile, and includes a machine frame, a driving axle, a directive axle, an engine, a gear-box, a transmission shaft, a reverse gear-box, a force obtaining device, a four-wheel braking system, and a damping flat spring. The whole chassis is a rear steering type, therefore the total weight is distributed equally to four tyres, and the pressure to the ground is greatly lowered; meanwhile, the adoption of the braking of the four wheels and the damping flat spring arranged on the directive axle assure safe and fast trans-regional work of the cropper.

The invention discloses a pit digging machine. The pit digging machine comprises a vehicle frame, a walking mechanism, wherein the walking mechanism is arranged at the lower part of the frame, and thewalking mechanism comprises a track component and a driving device for driving the track component to move; the pit digging mechanism is arranged at the head part of the frame, the pit digging mechanism comprises a lifting component, and one side of the lifting component is connected with the head of the frame; the speed reducing component is fixedly connected to the other side of the lifting component; the output end of the motor is connected with the input end of the speed reducing component; and the digging head is connected to the output end of the lower part of the speed reducing component. According to the pit digging machine, the track component is arranged as a part of the walking mechanism and can move on the uneven ground, so that the ground pressure in unit area can be reduced,the requirement for the road surface is low, and the phenomenon of tire burst does not easily occur.