Protection device for hydraulic actuator of front loader
FIELD: construction, pipeline.
SUBSTANCE: invention pertains to hydraulic actuators of carrying and lifting machines, namely, to front loaders handling supplies and construction materials in the scoop on construction sites and off-the-road. Protection device of the hydraulic actuator of a front loader contains a heavy hauler, working equipment, boom hydraulic cylinders and, at least, one balancing cylinder, head end whereof is connected with a gas cylinder. Accumulator, reverse-flow valve and an adjustable choke are switched to the head ends of the boom hydraulic cylinders. Valve "OR" is installed into the hydraulic line connecting distribution unit with rod ends of the boom hydraulic cylinders.
EFFECT: protection of hydraulic actuator from the negative effect as on working equipment lifting - down casting as in wheels movement over abrupt supporting surface.
The invention relates to a hydraulic lifting-transport machines, namely, frontal loaders, engaged in the movement of goods and construction materials in the bucket in terms of construction sites and off-road.
Known protection device hydraulic front loader that includes live axle with wheels, suspension bridge, containing the cylinders of the suspension, hydropneumatic accumulator, check valve and adjustable chokes, pressure relief valve [see, for example self-Propelled wheeled earthmovers /Ulyanov N.A., Roninson EG, V.G. Soloviev - M.: Mashinostroenie, 1976. - 359 S.].
A disadvantage of this device is the design complexity, due to the fact that the protection system use additional hydraulic cylinders, which increases the cost of the system.
Known hydraulic operating equipment front loader [see, for example, patent 2280737 C2, IPC E02F, 2006.01], which includes a wheeled tractor, working equipment, hydraulic cylinders boom and balancing pneumatic cylinder, a piston chamber which is connected to a gas cylinder, a relief valve.
A disadvantage of this device is the lack of protection of the hydraulic drive from disturbing influences when lifting, lowering work equipment when driving on an uneven support surface.<> The objective of the invention is to protect the hydraulic actuator as from impacts when lifting, lowering work equipment and the movement of the wheels on the uneven support surface.
The task of the invention is solved due to the fact that in the known device, containing the tractor, working equipment, hydraulic cylinders boom and at least one balancing cylinder, a piston chamber which is connected to the gas cylinder according to the invention in a piston cavity of the hydraulic cylinders boom connected the battery, check valve and an adjustable throttle, hydroline connecting the dispenser rod cavities of the hydraulic cylinders boom, installed valve "OR".
The invention is illustrated by drawings, where figure 1 shows a front loader with the highest elevated work equipment, provided with a device for protection of the hydraulic actuator; figure 2 - front-end loader with working equipment at maximum boom equipped with a protection device of the hydraulic actuator; figure 3 presents the system of protection of working equipment with two hydraulic cylinders boom and one of the balancing cylinder; 4 - the system of protection of working equipment with one cylinder arrows and two balanced pneumatic cylinders.
The protection device hydraulic front shipped is of OPIC contains wheeled tractor 1, working equipment 2, the cylinders of the boom 3, a counterbalancing pneumatic cylinder 4, the gas cylinder 5, a battery 6, the check valve 7, an adjustable orifice 8, the valve OR 9, the valve 10, the hydraulic pump 11, the pressure relief valves 12, 13, the tank 14.
The essence of the protection of the hydraulic front loader from effects is to expand the functionality of the invention in different modes of operation front loader: acceleration and braking of work equipment when lifting, lowering, work truck in transport mode when driving on uneven supporting surface.
The essence of the operation of the invention in the mode of the rise of a working equipment after filling the bucket with material consists in the operation of the acceleration of the working equipment of the stationary state in the mode of lifting, in which there are large forces of inertia and increases the pressure of the working fluid in the piston cavities of the hydraulic cylinders boom, which results in the discharge of a small amount of fluid in the battery. After the dispersal of the working equipment comes the steady state rotation arrows disappear forces of inertia and decreases the pressure in the piston cavities of the hydraulic cylinders boom. During this period, an overflow of the small volume of the working fluid from the accumulator back into hydrocele the other arrows.
The essence of the transport mode of the invention consists in the following. The movement of a front loader with a load in the bucket happens with the boom raised to the intermediate position shown in figure 2. When the wheels of the truck to some irregularities with the length l and height h, the operator with the existing hydraulic system work equipment usually reduces the speed or performs maneuvers to bypass irregularities. In both considered cases decreases the performance of the truck. The proposed method allows to move the bumps without slowing down the movement of the machinery. The essence of the operation of the device in transport mode is as follows. Hitting the wheels of the truck on the irregularity occurs at the time
where V∂- the speed of movement of the tractor with a load in the bucket.
For time t1is turning frame of the tractor about the axis of the rear axle together with the working and experiencing the acceleration of the boom and load, resulting in the piston cavities of the hydraulic cylinders boom increases the pressure of the working fluid. When a pressure accumulator is reset small amount of fluid from the piston cavities of the hydraulic cylinders boom in the battery 6 (3, 4). When lowering the wheels of the truck with irregularities happens is throttling the working fluid when returning it from the battery 6 in the working cavity of the hydraulic cylinders boom. This limits the pressure in the hydraulic cylinders boom and subsequent quenching of the oscillations. The movement of the forklift with the load in the bucket is at a high transport speed and provides high performance machines.
The protection devices of the hydraulic operating equipment for acceleration of work equipment is as follows. To lift the bucket of the loader, after completing his material, carry out the inclusion of the slide valve of the distributor 10 down. The working fluid from the hydraulic pump 11 is served in the piston cavity of the hydraulic cylinders 3 arrows. The beginning of the rise of the working equipment is accompanied by a considerable force of inertia of the working equipment and the increase in the pressure in the cavities of the hydraulic cylinders boom, causing part of the liquid is discharged through the check valve 7 in the battery 6. After the dispersal of the working equipment and the establishment of a constant speed of rotation of boom pressure in the working spaces of the cylinders of the boom is reduced and the working fluid from the battery 6 through an adjustable throttle piston 8 is returned to the cavity of the hydraulic cylinders 3 arrows. At the same time when a decrease in the volume of the piston cavities of the hydraulic cylinders 3 arrows is a corresponding increase in the rod ends of these cylinders are provided with valve "OR" 9, ensure the suction of the working fluid from the tank 14 to the rod end of the hydraulic cylinders boom. When returning the working fluid from the battery 6 to the cylinders 3 volume piston cavities increases, and the volume of the rod ends is reduced due to message the rod ends of the cylinders 3 arrows with discharge to the tank through the valve "OR" 9.
The operation of the device in transport mode is as follows. When hitting the wheels on the roughness of the support surface is rotated frame of the truck relative to the axis of the rear axle and there is a force of inertia of the working equipment, and increases the pressure in the piston cavities of the hydraulic cylinders 3 arrows. As a result, the portion of the volume of the working fluid is discharged from the piston cavities of the hydraulic cylinders 3 arrows in the battery 6. After moving irregularities in the working fluid from the battery 6 is returned through a managed hydrotussin 8 in the piston cavity of the hydraulic cylinders 3 arrows. At the first phase of operation of the device, the working fluid through the valve "OR" 9 sucked into the rod end of the cylinders 3 arrows from the tank, and the second phase of the process the working fluid displaced from the rod ends of the cylinders 3 arrows in the tank through the valve "OR" 9.
The proposed invention in the mode of lifting-lowering work equipment the study is carried out as follows. For lifting work equipment valve dispenser 10 include down. The working fluid from the hydraulic pump 11 is served in the piston cavity of the hydraulic cylinders 3 arrows. Thus from the rod ends of the cylinders 3 arrows working fluid through the valve OR 10 is discharged into the tank 14. To perform the operation of lowering work equipment valve dispenser 10 include up. The working fluid from the hydraulic pump 11 is fed through a valve OR piston 9 in the cavity of the hydraulic cylinders 3 arrows from the piston cavities of these cylinders, the working fluid is discharged into the tank 14 through the valve 10.
When performing lifting, lowering pressure and load balancing hydraulic cylinders 4 are virtually unchanged due to the size of the gas cylinder 5.
The protection device hydraulic front loader containing the tractor, working equipment, hydraulic cylinders boom and at least one balancing cylinder, a piston chamber which is connected to a gas cylinder, wherein the piston cavities of the hydraulic cylinders boom connected the battery, check valve and adjustable throttle and hydroline connecting the dispenser rod cavities of the hydraulic cylinders boom, installed valve "OR".
FIELD: construction industry.
SUBSTANCE: group of inventions refers to construction machine control systems and can be used in hydraulically-operated construction machines. Hydraulically-operated construction machine actuator movement control method consists in reference-input signal generated by manipulating handle with inductive position sensor, formation of control effect on hydraulic drive with the help of electric hydraulic converter. In addition hydraulically-operated construction machine actuator speed is measured, and manipulating handle position sensor output signal is compared with output signal of hydraulically-operated construction machine actuator speed measuring unit. Eventually the first difference signal which is converted in integral control, and the output signal of which is compared with output signal of speed measuring unit, is generated, and after that the second difference signal which is converted in second-order two term controller is generated, and then it is supplied to electric hydraulic converter of actuator hydraulic drive.
EFFECT: improving process reliability due to smooth movement of actuators as well as the possibility of obtaining wide range of speed control at variable load of hydraulic drive.
2 cl, 2 dwg
SUBSTANCE: invention concerns open pit, building, road and loading machines, in particular bucket excavators. The two-line hydraulic drive of a bucket excavator includes two pumps connected with flowing channels of the multi spool-type hydro distributor, directed towards each other, including the monoblock case and sliding valves of hydraulic engines management of working bodies, the return and bypass relief valves, pressure-tight and drain hydro lines. There are mortises in the hydro distributor case with bushes for placing sliding valves established inside, having channels, crosspieces arranged therebetween and apertures. There are borings executed in case mortises which length is equal to the total length of three central channels and two crosspieces between them.
EFFECT: reduction of dimensions of the hydro distributor case, metal consumption reduction, decreased labour iousness, improvement of functionality due to reduction of resistance of a liquid stream.
FIELD: component parts of dredgers or soil-shifting machines, particularly hydraulic or pneumatic drives thereof.
SUBSTANCE: balancing device comprises gantry and boom and includes main hydraulic cylinders and balancing hydraulic cylinder having piston and rod cavities communicated correspondingly with gas cylinder and with tank inlet through working liquid distribution means and hydraulic pump. Balancing device also has the second balancing hydraulic cylinder including piston and rod cavities communicated correspondingly with gas cylinder and tank inlet through working liquid distribution means similarly to the first hydraulic cylinder. The first and the second balancing hydraulic cylinders are pivotally connected with track-like loader gantry and boom and are installed over main hydraulic cylinders.
EFFECT: increased operational efficiency and improved sealing of gas cavity in balancing hydraulic cylinder.
FIELD: mechanical engineering; excavators.
SUBSTANCE: proposed hydromechanical travel-motion drive of rubber tire-mounted excavator contains power plant, hydraulic drive consisting of pumps, hydraulic motors, travel-motion power hydraulic lines, drain hydraulic lines, servo control hydraulic lines, control units, hydraulic speed selector, hydraulic distributor with address travel spool which connects, in neutral position, travel-motion power hydraulic line with drain hydraulic line through restrictors, mechanical drive including gearbox with synchronizer, gearbox control mechanism with servodrive, propeller shafts, front and rear axles and wheels. Additional circuit is placed in servo control hydraulic line between hydraulic speed selector and servodrive of gearbox control mechanism consisting of two control two-position spools, servocontrol hydraulic lines logic OR hydraulic valve whose input taps are connected with travel-motion hydraulic lines, and output tap, with control space of first spool, connecting in first position, control space of second spool with drain hydraulic line, and in second position, hydraulic line of second speed of gearbox control mechanism servodrive. With second spool in first position, hydraulic lines of first and second speeds of hydraulic speed selector are connected with corresponding hydraulic lines of first and second speeds of gearbox control mechanism servodrive and is second position, hydraulic line of first speed of gearbox control mechanism servodrive is connected with drain hydraulic line, and hydraulic of second, with servo control pressure hydraulic line.
EFFECT: faultless changing over from second into first speed on the run.
FIELD: construction and road building.
SUBSTANCE: invention relates to construction and road-building machinery, particularly, to single-bucket front-end with hydraulic-operated loading equipment. Proposed front-end loader with energy saving hydraulic drive of loading equipment contains base chassis with portal which carries loading equipment consisting of boom, rocker, tie-rod and bucket. Limit switch installed on boom has roller which is in constant contact with cam mounted on portal. Typical hydraulic drive of loading equipment includes boom and bucket cylinders, additional boom cylinder hinge connected with portal and boom, oil tank, pneumohydraulic accumulator, hydraulic distributor and other hydraulic mechanical connected by hydraulic lines into system providing control of all operations of machine working process. Hydraulic drive of loading equipment is furnished additionally with hydraulic pump, two-position and three-position electrohydraulic spools. In initial position and in position of lifting of loading equipment to height of unloading of loose material into vehicle, pressure hydraulic line of additional hydraulic pump is connected through channel of two-position electrohydraulic spool with drain hydraulic line and rod space of additional boom cylinder, and its piston space communicates through channel of three-position of electrohydraulic spool with liquid space of pneumohydraulic accumulator. In position of unloading of bucket into vehicle, pressure hydraulic line of additional hydraulic pump communicates through channels of two-position and three-position electrohydraulic spools with rod space of bucket cylinder, and piston space of said cylinder communicates through channel of three-position electrohydraulic spool with piston space of additional boom cylinder, and in lowering position of loading equipment, like spaces of additional boom and bucket cylinders communicate through channels of three-position electrohydraulic spool.
EFFECT: increased capacity owing to reduction of power consumption, reduced time of working cycle, facilitated conditions of operation for crane operator.
FIELD: construction engineering and mining machinery.
SUBSTANCE: invention relates to drives of cyclic action machines. Propose hydraulic drive includes power motor, flywheel, pumping set, hydraulic motor regulated to "p=Const", hydraulic motors of actuating mechanisms valves "OR" installed between pressure and drain main lines of hydraulic motors of actuating mechanisms, distributing equipment and tank. Pumping set is made two-section. Shaft of one section of pumping set is mechanically coupled with shaft of power motor, and shaft of other section is mechanically coupled with shaft of hydraulic motor and flywheel, and flywheel is coupled with shaft of motor by overrunning clutch.
EFFECT: improved reliability and economy of drive owing to provision of constant loading of motor.
FIELD: boom earth-shifting, mining, construction and other cyclic handling machinery provided with wheels or caterpillars.
SUBSTANCE: balancing device comprises working implement, main hydraulic cylinder and balancing pneumohydrocylinder. The pneumohydrocylinder includes piston cavity communicated with gas cylinder. Device also has working liquid distribution means, hydraulic pump provided with parallel main hydraulic cylinder and pneumohydrocylinder installed in the hydraulic pump and brought together with respect to longitudinal axis of working implement symmetry. In accordance with the first embodiment working liquid distribution means is installed to alternately communicate working cavities of main hydraulic cylinders with hydraulic pump and with hydraulic reservoir inlet. In the second embodiment working liquid distribution means may connect working cavities of main hydraulic cylinder with each other and with hydraulic pump in the first slide position, wherein main hydraulic cylinder dimension ratio is selected to provide ratio of square of piston diameter to square of shaft diameter equal to 2. In accordance with the third embodiment main working liquid distribution means provides alternate communication of main hydraulic cylinder working cavities with hydraulic pump and with hydraulic reservoir inlet, wherein additional distribution means is installed to provide connection of working cavities of main hydraulic cylinder with each other and with hydraulic pump in the first slide position. In the forth embodiment main distribution means may connect working cavities of main hydraulic cylinder with each other and with hydraulic pump in the first slide position, as well as with each other and with hydraulic reservoir inlet in the second slide position, wherein additional distribution means is installed to connect shaft end of balancing pneumohydrocylinder with hydraulic reservoir inlet in the first slide position and with hydraulic pump in the second slide position.
EFFECT: simplified structure, extended range of functional capabilities and increased rate of working implement lifting and lowering.
5 cl, 7 dwg
FIELD: construction and mining, particularly cyclic machine drives.
SUBSTANCE: hydraulic drive comprises pump, hydraulic monitor controlled by means of following slide. Above components are brought into rotation by power engine with flywheel. Hydraulic drive also has hydraulic cylinders for executive tools including hydraulic cylinder for working equipment, check valves installed between pressure and drainage pipelines of hydraulic cylinders for executive tools, distribution means including three-position distributor and three-position distributor control unit, as well as tank. Hydraulic drive is provided with two two-position slides. Control cavity of one two-position slide is connected to piston cavity of hydraulic cylinder. Control cavity of another two-position slide is communicated with control cavity of distributor. Inlet of the first two-position slide is connected with control unit, outlet thereof is linked to control cavity of distributor. Another outlet of the first two-position slide is connected to inlet of the second two-position slide having the first outlet linked to tank and the second outlet communicated with control cavity of following slide.
EFFECT: increased economical efficiency of the drive due to pumpback of lifted working equipment potential energy into the drive.
2 cl, 1 dwg
FIELD: mining, particularly hydraulic drives of earth-moving machines.
SUBSTANCE: hydraulic system comprises hydraulic pump, hydraulic reservoir, hydraulic cylinders for bucket drive, front gate, rear wall, as well as pressure valve with filling-up hydraulic cylinder having rod end communicated with hydraulic reservoir. Serially arranged between hydraulic pump and blind side of filling-up hydraulic cylinder are electrically driven two-position two-way valve member, check valve, hydraulic accumulator with pressure relay and hydrocontrolled two-position two-way and four-way valve members. Two-way and four-way valve members have control cavities communicated with rod end of rear wall drive hydraulic cylinder. Opened line of electrically driven two-way valve member connects hydraulic pump and blind side of filling-up hydraulic cylinder through check valve, hydraulic accumulator, pressure relay and opened lines of two-position two-way and four-way valve members. Closed line of hydrocontrolled two-position four-way valve member disconnects hydraulic pump and rod end of filling-up hydraulic cylinder. All inlets and outlets are connected with each other through the four-way valve member in the second position.
EFFECT: decreased power inputs for filling-up hydraulic cylinder operation due to possibility of hydraulic accumulator usage.
FIELD: mechanical engineering, particularly earth-moving and construction equipment to be operated at low temperatures.
SUBSTANCE: device for hydraulic drive heating comprises heat engine and hydraulic pump kinematically connected with each other. Device also has liquid heat carrier circulation loop including heat accumulator and connected to heat engine exhaust pipe through two-way valve. Heating member is arranged in tank and linked to heat engine generator.
EFFECT: increased simplicity and efficiency of hydraulic drive heating at negative ambient temperatures.
FIELD: earth-moving facilities; hydraulic drives of scraper working members.
SUBSTANCE: proposed hydraulic drive contains pressure spool installed in parallel with like spaces of two hydraulic cylinders, pressure main line connected between two check valves, free outlet of check valve being connected with inlet of pressure spool and one hydraulic cylinder. Free inlet is connected with outlet of pressure spool and other hydraulic cylinder, drum main line connects opposite spaces of hydraulic cylinders. Hydraulic drive is furnished with two series-connected pressure spools. Inlet of first pressure spool and outlet of second pressure spool are connected with outlet of first hydraulically controlled reversible spool. Their common line is connected with controllable space of second hydraulic cylinder and is separated by check valve from pressure main line. Inlets of first hydraulically controlled reversible spool are connected to outputs of second hydraulically controlled reversible spool and are connected with controllable spaces of first and second hydraulic cylinders. One inlet of second hydraulically controlled reversible spool is connected with inlet of pressure spool and is connected to pressure line through check valve, and second inlet is separated from pressure line by other check valve. Control spaces of two hydraulically controlled reversible spools are united and are connected to pressure main line through two-position spool.
EFFECT: improved efficiency of control of scraper blade system.
FIELD: handling machinery, particularly soil-shifting, mining, agricultural and loading cyclic machines.
SUBSTANCE: device includes implement, main hydraulic cylinders and balancing hydraulic cylinder, at least one gas cylinder and hydropneumatic accumulator, main and additional hydrodistributors, as well as safety valve. Gas cylinder communicates with gas chamber of hydropneumatic accumulator. Device made in the first embodiment has the second additional hydrodistributor connecting working chambers of the main hydraulic cylinders with each other and with pump. Rod end of balancing hydraulic cylinder communicates with rod ends of the main ones. In the second embodiment additional hydraulic cylinder is arranged in main hydrodistributor case and connected to hydrolines of the main hydraulic cylinders through hydrolines. Additional hydrodistributor is installed so that additional hydrodistributor may connect working chambers of the main hydraulic cylinders with each other and with the pump when additional hydrodistributor is installed in the first position. Additional hydrodistributor being installed in the second position may connect working chambers of main hydraulic cylinders with each other and with drain. Rod end of balancing hydraulic cylinder is connected with rod ends of main hydraulic cylinders.
EFFECT: increased machine productivity due to increased implement hoisting speed.
3 cl, 4 dwg
FIELD: mechanical engineering, particularly hydraulically driven dredgers.
SUBSTANCE: drive comprises power plant with controlled power pumps having servo control taps, gear-box, hydraulic motors and hydraulic equipment. Hydraulic equipment has hydraulic distributor with address travel spool and its servo control taps, power hydraulic lines and servo control loop with hydraulic lines. The controlled power pumps may supply predetermined volume of working liquid at zero pressure in servo control lines thereof. Hydraulic lines for servo control of address travel spool have additional circuit including control unit, servo control lines and logical hydraulic OR valve with two inlet and one outlet taps. Hydraulic lines of servo control circuit included in additional loop are connected with inlet taps of hydraulic OR valve having outlet tap communicated with servo control taps of address travel spool.
EFFECT: provision of no-failure gear actuation in standing still dredger.
FIELD: mechanical engineering, particularly hydraulic systems for mobile machines.
SUBSTANCE: hydraulic system comprises hydraulic reservoir, controllable hydraulic pump with load-sensitive control slide, power hydraulic line protected with safety valve, main hydraulic distributor with three-position slide having one pressure supply means, two discharge lines, two working outlet means and line, which provides connection of each working outlet means with LS line, attached to control slide. The hydraulic system is provided with pressure control valve and with controllable reducing valve installed in LS line. Input and output of reducing valve are connected to hydraulic distributor and control slide correspondingly. Control line of reducing valve is linked to pressure control valve outlet. Inlet and discharge line of the pressure control valve are connected with power hydraulic line and with hydraulic reservoir correspondingly.
EFFECT: increased operational efficiency and reliability.
7 cl, 1 dwg
FIELD: earth-moving, mining, building machines and other wheeled and caterpillar handling periodically acting machines.
SUBSTANCE: device comprises working implement, main and balancing hydraulic cylinders, gas cylinder, main and additional working liquid distribution means. The piston cavity of balancing hydraulic cylinder is connected with gas cylinder. Additional distribution means may connect working cavities of main hydraulic cylinders one with another and with hydraulic pump during implement lifting.
EFFECT: increased working implement lifting speed without pump and system parameter change.
FIELD: mining industry, mechanical engineering, possible use in system for controlling caterpillar drive of mining machine.
SUBSTANCE: hydro-system contains pumps for caterpillar drive and pump, feeding system of working functions of machine, hydro-distributors for controlling caterpillar drive, driving hydro-motors and working mains, two controllable check valves and hydro-distributor for controlling system of machine working functions. Outlet channels of hydro-distributor for controlling system of machine working functions are connected to inlet channels of controllable check valves, which are connected between each other. Outlet channels of these valves are connected to working mains of driving hydro-motors and hydro-distributors for controlling caterpillar drive.
EFFECT: possible movement of mining machine in case of breakdown of driving pumps at the expense of influx of working liquid from pump driving system normally used for working functions of machine.
FIELD: earth moving machinery.
SUBSTANCE: invention relates to hydraulic drives of draw-booster gears of tractor-drawn scrapers. Proposed hydraulic drive contains pump, hydraulic tank, hydraulic cylinder, pressure valve connected in parallel with hydraulic cylinder, and hydraulic distributor. Hydraulic drive contains additionally hydraulic accumulator, time relay, check valve, pressure valve is provided with control line, and hydraulic cylinder has control arm engaging with two-position spool whose input is connected with pump and output, through time relay, with hydraulic accumulator and control line of pressure valve and with input of check valve whose output is connected to input of pressure valve.
EFFECT: provision of automatic continuous increase of adhesion weight of tractor of scraper when digging.
FIELD: earth-moving and transport machines, particularly blade assemblies having changeable width of cut.
SUBSTANCE: blade assembly comprises side sections and central section. The sections are provided with undercutting blades and are directly connected to bucket bottom. The central section is hinged to bucket bottom and is operated by rotation hydraulic cylinders through operation levers. Undercutting blades made as gussets are connected to inner edges of side sections from below. The gussets have supports to cooperate with central section in lower position thereof. Undercutting blades of central section are connected to outer side edges of central section. Undercutting gussets are provided with orifices to arrange fixers installed in lower parts of side sections so that they may cooperate with end switches. Position switches adapted to cooperate with operation levers of central section in central or extreme positions are mounted on bucket side walls. Hydraulic cylinders for central section rotation are linked in pairs to hydraulic cylinders for bucket operation. Lifting and lowering cavities of hydraulic cylinders are correspondingly communicated with raising and deepening cavities of hydraulic cylinders for central section rotation. Hydraulic drive for blade assembly includes hydraulically operated on-off three-way slide. The first outlet of the slide is united with the third one and is linked to raising cavity of hydraulic cylinder for central section rotation. Operational chamber and the first inlet of the slide are connected to outlet of pressure slide having output connected to lowering cavities of hydraulic cylinders for bucket operation. The second and the third inlets of on-off three-way slide are correspondingly connected to lifting cavities of hydraulic cylinders, which operate front bucket gate and lowering cavity of hydraulic cylinders for bucket operation.
EFFECT: decreased load to be applied to blade system during earth cutting as central section is in central and extreme positions, provision of automatic installation of above section in side blade plane and in extreme positions.
FIELD: mechanical engineering.
SUBSTANCE: group of invention relates to boom earth-moving, mine, construction and loading lifting-and-transporting machines of cyclic action. Proposed balancing system contains working equipment, boom hydraulic cylinders and balancing cylinder including hydraulic rod space and gas piston space connected with gas bottle, and distributors. According to first design version, hydraulic rod space of balancing cylinder is connected by hydraulic line with drain into hydraulic tank, and distributor of hydraulic liquid is installed for connecting in one position of spool, of boom hydraulic cylinders working spaces to each other with hydraulic pump. According to second design version, distributor is installed in system for connecting working spaces of boom hydraulic cylinders to each other and with hydraulic pump. According to third design version, rod space of balancing cylinder is connected with distributor installed for connecting, in one position of spool, of rod space of balancing cylinder with into hydraulic tank, and in other position, with hydraulic pump. Distributor is installed in hydraulic line of boom hydraulic cylinders for connecting, in one position of spool, of spaces of boom hydraulic cylinders to each other and with hydraulic pump.
EFFECT: increased capacity of machine owing to higher speed of lifting and lowering of working equipment.
5 cl, 6 dwg
FIELD: mechanical engineering, particularly earth-moving and construction equipment to be operated at low temperatures.
SUBSTANCE: device for hydraulic drive heating comprises heat engine and hydraulic pump kinematically connected with each other. Device also has liquid heat carrier circulation loop including heat accumulator. Heat pipe is connected to heat engine exhaust pipe through two-way valve. Heating member is arranged in tank and linked to heat engine generator.
EFFECT: increased simplicity and efficiency of hydraulic drive heating at negative ambient temperatures.