RU2325561C2 - Electro hydraulic drive - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: drive can be used in drives of anti-aircraft aiming in rocket-gun systems. A unit of hydraulic distributors in the electric hydraulic drive (EHD) is made in form of three two-position hydraulic distributors with electric control; and where a flow of working liquid via the said distributors goes in turn to actuators of EHD under a control command to a relative hydraulic distributor. At the absence of the control command outputs of a hydro pump are tied to each other via serially connected inputs of three hydro distributors, while working cavities of actuators of EHD are locked by interior cavities of the distributors. Control of distributors is achieved by means of a logic device which is able to create three commands out of two coming to its input, and these three commands control in turn three hydro distributors. Such design of a hydro distributors unit and the logical unit facilitate unloading the hydro pump at absence of control commands and maintaining load at any specified angle thus achieving the above described technical result.

EFFECT: increase of operational reliability and enhancement of drive features.

2 cl, 2 dwg

Description

The present invention relates to the field of automatic regulation and control and can be used in guiding drives of anti-aircraft missile-gun systems.

Known electro-hydraulic drive (EGP) of the fighting compartment (RU 2002103438 A1, (GUP "KBP"), 08/27/2003) anti-aircraft missile-cannon complex, where the vertical guidance of an automatic gun and two guides with missiles is carried out by separate drives.

The disadvantage of this EGP is its large mass, dimensions, high energy consumption.

Known EGP anti-aircraft missile and cannon complex (RU 2258886 C1, (TUP "KBP"), 08.20.2005, adopted as a prototype), containing a rotating tower with automatic guns and two guide blocks with missile containers.

Installation with automatic guns and guide blocks with missiles kinematically separated from each other.

Guiding the installation with automatic guns and guide blocks with missiles is carried out separately by an electro-hydraulic drive.

The disadvantage of the described drive is that in the absence of the “Left block” and “Right block” commands, when the flow of the working fluid from the hydraulic pump enters the hydraulic motor, due to the residual performance of the hydraulic pump, even in the absence of a control signal, pressure and flow of the working fluid will be created at its output which will carry out unauthorized movement of the installation with guns, and if it is blocked, then the pressure at the outlet of the hydraulic pump will increase until the safety valves in the pump operate, and there will be large mechanical loads on the locking device.

This mode of operation is extremely undesirable both for the hydraulic pump, since it reduces its operational reliability, and for the drive as a whole, since it can cause unauthorized movement of the installation with guns and will not ensure the installation is locked in a specific position, and when the installation is locked, creates an additional mechanical load on stopper.

The task that the invention solves is to increase the operational reliability of the drive by eliminating the load on the hydraulic pump in the absence of control commands and expanding the functionality of the drive - ensuring that the installation with guns and guide blocks is locked at any fixed angle by locking the cavities of the drive actuator.

The solution to this problem is achieved by the fact that in the electro-hydraulic drive containing an adjustable hydraulic pump, the input of which is connected to the control signal, the valve block, the inputs of which are connected to the hydraulic pump, the first hydraulic cylinder, the second hydraulic cylinder and the hydraulic motor associated with the outputs of the valve block, two command inputs "First hydraulic cylinder "," Second hydraulic cylinder ", while the block of hydraulic valves is made in the form of three controlled two-position four-line hydraulic valves, and the first input of the first control valve is connected to the first pressure line of the hydraulic pump, the second input of the first control valve to the first input of the second control valve, the second input of the second control valve to the first input of the third control valve, the second input of the third control valve to the second pressure line of the hydraulic pump, while the first and second inputs each directional valve are interconnected by its internal cavities, the closed outputs of the first, second and third directional valves are connected respectively but with the cavities of the first hydraulic cylinder and second hydraulic cylinder; a logical device is introduced into it, the first input of which is connected to the “First hydraulic cylinder” command, the second input - to the “Second hydraulic cylinder” command, the first output of the logical device is connected to the control input of the first valve, the second output - to the control input of the second valve, the third output with the control input of the third valve, the control signal at the first output of the logical device is provided when a command is sent to the first input of the logical device, at the third output - at giving a command to the second input of the logical device, at the second output - while giving commands to the first and second inputs of the logical device.

Moreover, the logical device contains three two-input logic elements AND and two logical elements NOT, with the first inputs of the first and second logical elements AND and the input of the second logical element NOT connected to the “First hydraulic cylinder” command, the second inputs of the second and third logical elements AND and the input of the first the logic element is NOT connected to the “Second hydraulic cylinder” command, the output of the first logic element is NOT connected to the second input of the first logical element AND, the output of the second logic element is NOT connected to the input of the third logical element AND, the output of the first logical element And is the first output, the output of the second logical element And is the second output, the output of the third logical element And is the third output of the logical device.

The described design of the valve block allows unloading the hydraulic pump from the pressure at its outlet in the absence of commands at the inlet of the valve block due to the closure of the pressure lines of the hydraulic pump to each other through the series-connected inputs of the three valve valves, which in the absence of commands are pairwise interconnected by the internal cavities of the valve. At the same time, the specified design of the block of hydraulic distributors eliminates the possibility of the residual capacity of the hydraulic pump falling into the actuator of the electro-hydraulic drive - the hydraulic motor and, therefore, unauthorized movement of the installation.

At the same time, the design of the control valves ensures that the cavities of the hydraulic cylinders and the hydraulic engine are locked by the internal cavities of the control valves, which ensures that the installation with guns and guides with missiles is held at a constant angle. The logic device introduced into the drive allows three teams to be formed from two commands “First hydraulic cylinder” and “Second hydraulic cylinder”, which control three hydraulic distributors in turn. At the same time, the command to control the directional control valve providing the connection of the pressure lines of the hydraulic pump to the hydraulic motor is formed with both the First Hydraulic Cylinder and the Second Hydraulic Cylinder commands.

The drawing shows a functional diagram of the proposed electro-hydraulic drive.

Information confirming the possibility of carrying out the invention to obtain the above result is set forth below.

The drive contains an adjustable hydraulic pump 1, a block of control valves 2, control valves 3 and 4, a hydraulic motor 5, a first hydraulic cylinder 6, a second hydraulic cylinder 7, a hydraulic control valve 8 and two command inputs "First hydraulic cylinder", "Second hydraulic cylinder", and the hydraulic pump 1 input is connected to a control signal , the inputs of the block of the control valves 2 are connected to the hydraulic pump 1, the first hydraulic cylinder 6 and the second hydraulic cylinder 7 are connected to the outputs of the block of the hydraulic distributors 2. Moreover, the block of hydraulic distributors 2 is made in the form of three two-position four-cylinder electrically controlled linear valves 3, 4, 8, and the first input of the valve 3 is connected to the pressure line 9 of the hydraulic pump 1, the second input of the valve 3 is connected to the first input of the valve 8, the second input of the valve 8 is connected to the first input of the valve 4, the second input of the valve 4 connected to the pressure line 10 of the hydraulic pump 1, while the inputs of each of the valves 3, 4, 8 are paired with each other by the internal cavities of the valve, the outputs of the valve 3 are connected with the cavities of the first hydraulic cylinder 6, the outputs of the hydraulic distributor 8 are with the cavities of the hydraulic motor 5, the outputs of the hydraulic distributor 4 are with the cavities of the second hydraulic cylinder 7, while the pressure lines of the hydraulic motor 5 and both hydraulic cylinders 6, 7 are closed by the internal cavities of the hydraulic distributors 3,4, 8.

In addition, the drive contains a logic device 11, consisting, for example, of three two-input logic elements AND 12, 13, 14 and two logic elements NOT 15, 16. In this case, the first inputs of logic elements 12, 13 and the input of logic element 16 are connected to the command "The first hydraulic cylinder", the second inputs of the logic elements 13, 14 and the input of the logic element 15 are connected to the command "Second hydraulic cylinder", the output of the logical element 15 is connected to the second input of the logical element 12, the output of the logical element 16 is connected to the first input of the logical element 14, the output of the logic element 12 is connected to the control input of the control valve 3, the output of the logic element 13 is connected to the control input of the control valve 8, the output of the logic element 14 is connected to the control input of the control valve 4.

The operation of the drive is as follows.

If there are no commands “First hydraulic cylinder” and “Second hydraulic cylinder” at the inputs of the logical device 11, there are no control signals at the outputs of the logical device 11. In this case, the control valves 3, 4, 8 are in the state shown in the drawing, that is, the pressure lines 9, 10 of the hydraulic pump 1 through series-connected inputs of the control valves 3, 4, 8, pairwise connected by the internal cavities of the control valves, are interconnected, which ensures unloading of the hydraulic pump 1 in the absence of teams. At the same time, the pressure lines (cavities) of the hydraulic cylinders 6, 7 and the hydraulic motor 5 are locked by the internal cavities of the hydraulic valves 3, 4, 8, which ensures that the corresponding installations are held in a certain position.

When a command is issued, for example, “First hydraulic cylinder”, a signal arriving at the control input of hydraulic distributor 3 appears at the output of logic element 12. At the same time, hydraulic distributor 3 is set to a state where pressure lines 9, 10 of hydraulic pump 1 are connected through hydraulic distributor 3 to the cavities of the left hydraulic cylinder 6. When the control signal arrives at the inlet of the hydraulic pump 1, the flow of the working fluid from it through the pressure lines 9, 10 and the control valve 3 enters the left hydraulic cylinder 6, which moves the first block of the direction with rockets. When the command "Second cylinder", the signal appears at the output of the logic element 14.

In this case, the control valve 4 will turn on and connect the pressure lines 9, 10 of the hydraulic pump 1 with the cavities of the right hydraulic cylinder 7.

When the commands “First hydraulic cylinder” and “Second hydraulic cylinder” are simultaneously sent, a control signal will appear at the output of logic element 13. At the same time, a control valve 8 will be turned on, which will connect the pressure lines 9, 10 of the hydraulic pump 1 to the hydraulic motor 5, which ensures the movement of the units with guns.

Thus, the proposed technical solution allows to increase operational reliability and expand the functionality of the drive.

The proposed technical solution has been tested experimentally and introduced into the design documentation of one of the products developed by FSUE VNII Signal.

Claims (2)

1. An electro-hydraulic actuator containing an adjustable hydraulic pump, the input of which is connected to a control signal, a valve block, the inputs of which are connected to a hydraulic pump, a first hydraulic cylinder, a second hydraulic cylinder and a hydraulic motor connected to the outputs of the hydraulic valve block, two command inputs “First hydraulic cylinder”, “Second hydraulic cylinder” ", Characterized in that the valve block is made in the form of three controlled two-position four-line valve, and the first input of the first valve connected to the first pressure line of the hydraulic pump, the second input of the first valve - with the first input of the second valve, the second input of the second valve - with the first input of the third valve, the second input of the third valve - with the second pressure line of the hydraulic pump, while the first and second inputs of each valve are connected between by its internal cavities, closed exits of the first, second and third hydraulic distributors are connected respectively to the cavities of the first hydraulic cylinder , a hydraulic motor and a second hydraulic cylinder; a logical device is introduced into it, the first input of which is connected to the “First hydraulic cylinder” command, the second input - to the “Second hydraulic cylinder” command, the first output of the logical device is connected to the control input of the first valve, the second output - to the control input of the second valve, the third output with the control input of the third valve, the control signal at the first output of the logical device is provided when a command is sent to the first input of the logical device, at the third output - at giving a command to the second input of the logical device, at the second output - while giving commands to the first and second inputs of the logical device. 2. The electro-hydraulic drive according to claim 1, characterized in that the logic device contains three two-input logic elements AND and two logic elements NOT, the first inputs of the first and second logic elements AND and the input of the second logic element NOT connected to the "First hydraulic cylinder" command, the second inputs of the second and third logical elements AND and the input of the first logical element are NOT connected to the “Second hydraulic cylinder” command, the output of the first logical element is NOT connected to the second input of the first logical element And, in movement of the second NAND gate connected to a first input of the third AND gate, an output of first AND gate is the first output, the second output of the AND gate - a second output, the output of the third AND gate - third output of the logic device.