Electro-hydraulic power

 

(57) Abstract:

Usage: in servo systems of machines, machine tools, robots. Essence: in the electrohydraulic amplifier including an external magnetic circuit with the field winding, covering the fixed pole with stepped shunt variable cross-section, concentric annular ledges facing axially movable anchor, sliding inside the ferromagnetic tube and associated axle with a movable steering element, a stationary pole is made with two ledges and ledge, placed in the center, made in the form of a cone whose height is less than the height of another ledge, made with a cylindrical internal bore and installed to form between the ledges of the ring groove of trapezoidal cross-section. 1 Il.

The invention is intended for use in systems electrohydrostatic as analog electrohydraulically and can be used in servo systems of machines, machine tools, robots.

Known solenoid DC, including the external magnetic circuit, the excitation winding, covering the fixed pole with shunt variable cross-section and the ferromagnetic tube, inside which u is echanism (Japan patent N 55-7930, CL H 01 F 7/16, F 16 K 31/02 1980).

The disadvantage of this solenoid is in a limited range of linear movement of the armature and its associated actuator due to a sharp increase in tractive force when approaching the anchor to a stationary pole. To correct the distortion of the traction curve is used non-magnetic spacer (washer), limiting the working stroke of the armature, and therefore, narrowing the range of application of the known device.

The closest to the technical nature of the present device is an electrohydraulic switching device containing placed in the enclosure - external magnetic field winding covering the fixed pole with stepped shunt facing the axially movable armature with the response speed of the ring shunts appropriate length and a smaller diameter located inside the ferromagnetic tube and the associated axis with the movable element of the hydraulic system.

The disadvantage is that the traction characteristics of the Electromechanical transducer is not horizontal, and pulsating. This is because the generalized traction curve is essentially ogiba is passed annular projections of the armature and the stationary pole. And these projections are essentially shunts constant cross section, which is characterized by a sharp increase traction at the beginning of the stroke of the armature and a sharp reduction efforts in the mid-stroke of the armature. In addition, the closer the anchor to stop increasing the mechanical conductivity between elementary steps, which causes the switching valve of the hydraulic system with shock. Thus, violated the horizontal characteristics and at the end of the anchor. Following the disadvantage inherent in the known device, is the inability of the proportional control valve of the hydraulic system. As mentioned above, the traction characteristic of a device can be represented as a set of fragments of the initial sections of the traction curves, caused by the interaction of elementary tubes of constant cross-section. And if it is, then more or less horizontal characteristic of the known device will match only a specific value of magnetizing force (property shunts constant cross section to change the shape of the tractive force when changing magnetizing force, unlike shunts variable cross-section). This means the inability of the proportional control valve pie is expanding the scope and functionality due to the possibility analog (proportional) control spool of the hydraulic system.

The technical result is achieved by the fact that the electrohydraulic amplifier containing placed in the enclosure - external magnetic field winding covering the fixed pole with stepped shunt variable cross-section, concentric annular ledges facing axially movable anchor located inside the ferromagnetic tube and the associated axis with the movable element of the hydraulic system provides the following design features: fixed pole is made with two ledges and ledge placed in the center made in the form of a cone whose height is less than the height of another ledge, made with a cylindrical internal bore and installed to form between the ledges of the ring groove of trapezoidal cross-section.

When carrying out the invention the excitation winding is contained in enclosure - external magnetic circuit, comprises a fixed pole with two pieces of variable cross-section, and the ledge, placed in the center, made in the form of a cone whose height is less than the height of another ledge, made with a cylindrical internal bore and installed to form between the ledges ring grooves trapetseidalnym axis with the movable element of the hydraulic system. On the axis of the anchor is non-magnetic spacer to eliminate the small residual magnetization.

This design of the proposed solution allows us to formulate the horizontal traction characteristics in a wide range of the stroke and to implement proportional control of the hydraulic system, which expands the scope and functionality of known solutions.

The drawing shows the proposed amplifier.

Electrohydraulic amplifier contains an external magnetic circuit 1, the field winding 2, covering the fixed pole 3 with two concentric annular ledges. The Central ledge 10 is made in the form of a cone whose height is less than the other ledge 4, made with a cylindrical internal bore and installed to form between the ledges of the ring groove 9 of trapezoidal cross-section. Anchor with a non-magnetic spacer 14 is installed on the axles 11, 12, moving in the non-magnetic bearings 7 and 8 and is located inside the ferromagnetic tube 5. The axis 12 of the armature affects the balanced springs 15 movable steering element 16. Non-magnetic cover 13 serves as a support axis 11 of the anchor.

Electro-hydraulic power osti, limited external annular ledge 4. When this annular ledge 4 of variable cross-section is heavily saturated as the radial magnetic flux and flow of buckling anchor 6 on the outer conical surface and the inner cylindrical surface of the ledge 4. As a result, the ledge 4 acquires properties regulator constant effort, and hence the traction characteristics at the beginning of the stroke of the armature is horizontal. The influence of the Central conical ledge 10 at the beginning of the stroke of the armature is small for two reasons. First, due to the large lengths of secondary power lines likely flow paths between the anchor and the ledge 10. And, secondly, due to the small volumes formed by the rotation of plane figures likely flow path around the axis of symmetry of the poles. Closer to the anchor ledge 10 increases the conductivity between the planar end face of the armature 6 and mainly truncated-conical surface of the ledge 10. , resulting in a ledge 10 is saturated and limits the sharp increase traction armature in attracted position. Therefore, electro-hydraulic amplifier does not lose control when approaching the anchor to the ledge 10 and the traction characteristic is horizontal throughout the range of lane is getting horizontal features at the end of the anchor. When moving the armature toward the stationary pole 3 is offset from the axis 12 counterbalanced by the springs 15 of the rolling element of the hydraulic system 16, which is increasing the flow of the working fluid.

Thus, the proposed device is a linear Converter of the control current to the flow of the working fluid.

Return the armature to its original position when the current reduction control is due to the return springs 15 16 steering.

The proposed design of electrohydraulic amplifier in comparison with the prototype allows to extend the scope and functionality due to the fact that the fixed pole is made from two pieces, a Central conical ledge which is less than the height of another ledge, made with a cylindrical internal bore and installed to form between the ledges of the ring groove of trapezoidal cross-section. (56) USSR Author's certificate N 1451358, CL F 16 B 13/044, 1986.

ELECTROHYDRAULIC AMPLIFIER containing placed in an external magnetic field winding covering the fixed pole with stepped shunt variable cross-section, concentric annular lips of the y axis with the movable element of the hydraulic system, characterized in that the pole is made with two ledges and ledge, placed in the center, made in the form of a cone whose height is less than the height of another ledge, made with a cylindrical internal bore and installed to form between the ledges of the ring groove of trapezoidal cross-section.

 

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