Pump-and-accumulator hydraulic drive

 

(57) Abstract:

Pump-and-accumulator hydraulic drive refers to the actuators of the control systems of various machines, flying machines, robots, machine tools and other Hydraulic contains Executive hydraulic part-turn actuator type, the output link which is made in the form of a hollow cylinder, the inner surface of which is intended for play-free fixing and mounting directly on the shank of the governing body of the object. On its outer surface tides, one of which communicates with the connecting rods coaxially with (or parallel) placed pistons. On the other tide made a trap for the latch, which when interacting with lock ensures play-free fixing of the output link in the middle position after the power is switched off. The hydraulic actuator is equipped with an electromagnetic valve banding, the inlet of which communicates with hydroline pressure pump low pressure and with camera control latch, and the output from the tank. External movable seal retainer and the piston of the actuator is selected in a special closed cavity is connected by hydroline with the tank. Technical the Oka service hydraulic actuator, reliable auto play-free fixing of the output link in the middle position after the power is switched off. 1 Il.

The invention relates to pump-and-accumulator hydraulic, found the widest application in the field of hydraulics as the actuator in control systems of various machines, aircraft, robotics, machine tool.

Known electro-hydraulic steering hydraulic drives, containing the Executive hydraulic part-turn actuator type, the variable capacity pump, electro-hydraulic amplifier with Bolotnikova distributor-type nozzle-valve", pneumohydraulic the battery and tank of the closed type with pressure (see, for example, the book Geminin N. With. Design of hydraulic servo actuators of the aircraft. M: mechanical engineering, 1981, page 12, Fig.1.5).

Known, in addition, piston rotary actuators (see, for example, the book Basta So M displacement pumps and hydraulic motors hydraulic systems. M : mechanical engineering, 1974, pages 532-536, Fig.226-232. However, some of them (Fig.226,228...232) have low efficiency and increased clearances in the kinematic chain connection with CLASS="ptx2">

Also known torque, i.e. the cylinders, devoid of the above disadvantages, but their characteristic, such as design complexity, low efficiency, especially when dealing with high external loads, low dynamic performance, low reliability, significant partecke working fluid (see for example the book Khokhlov, C. A. Electrohydraulic servo actuator, ed. Science, 1996, pp. 67-68, Fig.3,W).

Also known locks for fixing the output level of the hydraulic motor in the middle position of the mechanical and hydraulic type: ball, blade, pin and friction (see for example the book Basta T. M. Calculations and design of aircraft hydraulic devices. M: Barongis, 1961, pages 200-203 and book Ganitsky Century. And. and other Drive tail surfaces of the aircraft. M: mechanical engineering, 1974, page 177, Fig.4.22 and 4.23).

Some of them are complicated and cumbersome, while others have low reliability and service life, have a limited range in value of the managed pressure.

The closest in technical essence is a "hydraulic Pump" (see RF patent 2127686 from 20.03.99 g), which contains a common housing connected by a hose to dejstvuusih by means of rods with an output link, electrohydraulically type "nozzle-valve", hydropneumatic accumulator, the hydraulic tank of the closed type with positive pressure and located on a common drive shaft block pumps, consisting of a high-pressure pump, pressure hydroline which is connected to the operating Windows spool valve, and pump low pressure, pressure hydroline which is connected through a fixed choke potrzebie cameras control the spool valve and nozzles electrohydraulically.

Well-known advantages of pump-and-accumulator hydraulic drives of this class, the main of which are high efficiency, high modularity, high performance, and overall mass properties.

However, the known pump-and-accumulator hydraulic drives have a number of disadvantages, the main of which are the low dynamic accuracy testing of the control signal due to the increased dead zone, the value of which is directly connected c the amount of friction in the bearings of rotary hydraulic motor which, in turn, is a consequence of the presence of the working pressure in the cavities of the hydraulic motor. In addition, under the s in the hydraulic drive (up to 380 kgf/cm2), lead to intensive wear, reducing the resource of the hydraulic actuator, increasing the amount of backlash in the power wiring control.

In addition, the known pump-and-accumulator hydraulic drives do not provide reliable automatic fixing the output level of the hydraulic drive in the middle position after the power is switched off.

Well also aware of the great problems that lead to the degradation of the hydraulic actuator associated with the need for external tightness movable seals placed on the pistons of the hydraulic motor, the latch mechanism for play-free fixing in the middle position of the output link, the piston of the hydraulic compensation and other

An object of the invention is to remedy these disadvantages, namely: improving the dynamic accuracy of the testing control signal, increase the service life of the hydraulic drive, ensuring reliable automatic (on the control electric signal) play-free fixing of the output link in the middle position after the power is switched off.

The problem is solved in that the proposed pump-and-accumulator hydraulic drive containing a common housing connected with the speaker of the pistons, interacting by means of rods with an output link, the mechanism for play-free fixing of the output link in the middle position, consisting of a clamp, supplied with camera control, trap release, electro-hydraulic amplifier of the type "the nozzle-valve", hydropneumatic accumulator, the hydraulic tank of the closed type with positive pressure and located on a common shaft block pumps, consisting of a high-pressure pump, pressure hydroline which is connected to the operating Windows spool valve, and pump low pressure, pressure hydroline which is connected through a fixed choke potrzebie cameras control the spool valve and nozzles electrohydraulically, equipped with an electromagnetic valve, the inlet of which communicates with hydroline pressure pump low pressure and with camera control latch, and the output from the tank, the output element of the actuator is made in the form located on the supports of the hollow cylinder, the inner surface of which is intended for play-free fixing and mounting directly on the shank of the governing body of the object and on its outer surface tides, one of which serves for vzaimodeystviya with locking mechanism play-free fixing of the output link with trap release, executed on another of these tides in the form of a hole or groove of the same shape, the end portion of the locking mechanism made in the form of a conical element, located on the differential spring loaded piston.

The search, conducted on technical sources of information, showed that the claimed technical solution is not known, i.e. it corresponds to a condition of patentability - novelty". Because the claimed technical solution is known constituent parts, it meets the condition of "industrial applicability". As well as in the obvious way implemented the task, then the proposed solution meets the condition of"inventive step".

The essence of the invention is illustrated in the drawing, which shows the General scheme of the hydraulic drive.

Pump-and-accumulator hydraulic drive contains Executive hydraulic motor 1, consisting of pistons 2, interacting by means of rods 3 with the output element 4, made in the form of a hollow cylinder located on its outer surface tides 5 and 6, one of which interacts with the piston 2, and on the other tide made the trap latch 7 meago the shape of the end portion of the latch 7, equipped with a camera control 8 reported by hydroline 9 hydroline pressure pump low pressure 10, electrohydraulically type "nozzle-valve"", consisting of Electromechanical transducer 16, the nozzles 17 and the spool valve 18, the electromagnetic valve 19, the inlet of which communicates with hydroline head 9 pump low pressure 10 and the control chamber 8 of the latch 7, and the output - hydroline 14 tank 15, the solenoid valve 20 of the high-pressure pump 21.

To ensure lightweight running hydraulic valve is the inclusion of 22, to ensure maximum cost - hydropneumatic accumulator tandem type 23, the piston 24 which has a relief valve for gas 25 and the working fluid 26 to provide temperature compensation of the expansion of the working medium in the tank is the bellows 27, driven by the pusher 28, to ensure the functioning of the hydraulic drive in a lightweight mode are check valves 29 and 30, for cooling and lubrication of the high pressure pump 21 when operating in lightweight mode is air hydroline intake with throttle 31, for protection of hydroline pressure pump low pressure overload is Ki hydraulic drive as follows.

At the start of the drive shaft and the absence of commands to activate the solenoid valves 19 and 20 (the position shown in the drawing) of the high-pressure pump 21 due to the fact that his hydroline suction is blocked by a valve incorporating 22, is in the zero feed without back pressure, and the pump low pressure 10 electrically connected with the tank 15, is minimum load on the drive shaft, which greatly facilitates the starting of the hydraulic drive, especially at low ambient temperatures, when the output link is locked in the neutral position.

When submitting commands to the electromagnetic valve 19 hydroline pressure pump low pressure 10 is detached from the tank 15, the pressure therein increases to the set pressure of the safety valve 32, the latch 7 restorative the output link 4, opens the check valve 29 is closed check valve 30 and the working environment is supplied to nozzles 17 electrohydraulically and Poltoranin cameras control the spool valve 18, and his work Windows, providing, when applying control signals to the Electromechanical transducer 16, the operation of the hydraulic actuator from nanoregime, from a source of low drive power.

Further, when the operation command to the electromagnetic valve 20 of the high-pressure pump 21 of its pressure hydroline detaches from the tank 15, the pressure therein increases to the nominal value. i.e., until the set pressure of the safety valve 26, the check valve 30 is opened, the check valve 29 is closed and, when applying control signals to the Electromechanical transducer 16, the hydraulic actuator operates in normal mode when you do this, depending on the magnitude and sign of the control signal provided by the rotation of the output element in one direction or another at a certain speed.

When removing an electrical signal to the electromagnetic valves 19 and 20 (the position shown in the drawing) hydroline pressure pump low pressure 10 and the control chamber 8 of the retainer 7 are connected with the tank 15 and the latch 7 under the action of the spring causes the output link 4 to the middle position and locks it in this position.

With long-term (20 years) storage in a wide range of ambient temperatures ( 60o(C) a bellows 27 monitors the entire range of variation of volume of the working medium in the tank associated with the fluctuation rate is m the most favorable conditions for running hydraulic and improved reliability for tightness during the entire storage period. At the start of the drive shaft of the unit pumps the pressure arising in the hydroline pressure pump low pressure moves the plunger 28 until it touches the bottom of the bellows 27, providing increased to 3...4 kgf/cm2the pressure in the tank, thereby creating favorable conditions for the operation of the pumps after startup.

Numerous studies conducted during the industrial use pump-and-accumulator hydraulic actuators in accordance with the proposed scheme, fully confirmed their advantages compared with the known.

Pump-and-accumulator hydraulic drive containing a common housing connected with a pressure hose, drain and management Executive hydraulic part-turn actuator type, consisting of pistons, interacting by means of rods with an output link, the mechanism for play-free fixing of the output link in the middle position, comprising a spring-loaded clamp with camera control, trap release, electro-hydraulic amplifier of the type "the nozzle-valve", hydropneumatic accumulator, the hydraulic tank of the closed type with positive pressure and located on a common drive shaft unit pump consisting of a pump in the La, and pump low pressure, pressure hydroline which is connected through a fixed choke potrzebie cameras control the spool valve and nozzles electrohydraulically, characterized in that it is equipped with an electromagnetic valve, the inlet of which communicates with hydroline pressure pump low pressure and with camera control latch, and the output from the tank, the output element of the actuator is made in the form located on the supports of the hollow cylinder, the inner cavity of which is intended for play-free fixing and mounting directly on the shank of the governing body of the object and on its outer surface tides, employees to interact with coaxial or parallel-arranged hydraulic pistons through connecting rods and to interact with the latch mechanism play-free fixing of the output link with trap release, made on one of these tides in the form of a hole or groove of the same shape, the end portion of the locking mechanism made in the form of a conical element, located on the differential spring loaded piston.

 

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FIELD: defense engineering; production of guided missiles and projectiles.

SUBSTANCE: the invention is pertinent to the field of defense engineering, in particular, to production of guided missiles and projectiles. The technical result of the invention is simplification of testing, increased accuracy, decreased labor input and cost of the testing. The method of testing of a developed torque of an electro-pneumatic steering gear of guided missiles and projectiles is based on a torque measurement of the steering gear with the help of a reference load and an easily removable balance lever put on a rudder. Then the steering gear with a detector of the rudders motion are installed on a customizing table. The detector of the rudders motion is made in the form of a separate contact or non-contact sensor or for the purpose they use an available in the steering gear as a feedback gauge - the gauge of a piston linear motion or a gauge of angular motion of rudders. The rudders turning at a maximum angle in one side is made using application of a torque of the corresponding sign by a reference load with the weight on a definite length of an arm of a placement of the load on the lever in respect to the axis of rotation of the rudders equal to a developed torque of the steering gear at the given pressure of the feeding. Switch on the power of the gauge, measure the voltage on the gauge output by a voltmeter, remove a torque by removal of the reference load, turn the rudders at a maximum angle in other side using application of a torque of an opposite sign equal to a maximum torque of a hinged load on the rudders in respect to the rudders turning angle and an angle of attack of a missile or a projectile. Switch on power supply of the booster of the steering gear and feed onto an input of the steering gear compressed air under pressure of P =1.5Pgvn., feed onto the input of the steering gear a maximum control signal of management corresponding to the motion of the rudders at a maximum angle, measure the voltage on the output of the gauge, which should meet the first given ratio. By a smooth reduction of pressure of the feeding in the pneumo-circuit) of the steering gear and according to reduction of voltage on the output of the gauge determine pressureP

+1
at which the voltage will meet the second given ratio. At that the pressure P+1
should be no more than Pgvn ,remove a pneumatic feeding and the power supply of the booster of the steering gear and switch off the control signal and the power of the gauge. After that using an analogous method they measure voltages and determine the pressure at application of the corresponding torques and a control signal of an opposite sign and determine a developed torque of the steering gear according to the mathematical formula.

EFFECT: the invention ensures simplification of testing, increased accuracy, decreased labor input and cost of the testing.

5 cl, 1 dwg

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