CN201723520U - Swing type hydraulic proportioning and servo valve - Google Patents

Abstract

A swing type hydraulic proportioning and servo valve is matched with a swing motor (3) and an angular displacement sensor and controlled by a control chip. An oil supply hole (P) and an oil return hole (T) are formed in the front of the valve body (5); a rising oil hole (A) and a dropping oil hole (B) are formed at the back of the valve body (5) and are respectively communicated with an oil tank through oil delivery pipes (L), and the inner parts of the two holes are respectively communicated with a valve opening (R) through a through oil pipe cavity (N); a valve core (6) adopts a crisscross core shaft and is assembled with the valve body (5) to form a three-position four-way valve; and the swing motor (3) adopts a two-way output shaft structure, wherein, the output shaft at one end is connected with a connecting shaft of the valve core (6), and the output shaft at the other end is connected with the central shaft of the angular displacement sensor (1). The control chip can adjust the input current of the motor, the rotating angles of the output shafts and the swing angle of the valve core (6) promptly according to feedback information of the sensor, and changes the open section areas of the oil holes so as to keep hydraulic flow rate and pressure in the design values; and the swing type hydraulic proportioning and servo valve can realize stepless speed regulation, can stay in discretional positions within the swing range, and has the advantages of high control precision, good dynamic characteristic, convenient and flexible operation and wide applicable range.

Description

A kind of swing type hydraulic proportioning, servovalve

Technical field

The utility model relates to the hydraulic pressure components and parts, relates in particular to the control valve of hydraulic system oil cylinder.

Background technique

Hydrovalve is to be used for the components and parts of controlling liquid pressure, flow and direction in the hydraulic transmission, and its performance directly determines the hydraulic system overall efficacy.In various hydraulic flows, pressure controlled valve, Proportional valve, servovalve are because dynamic response is fast, control accuracy is high, demand is very big in fields such as Aeronautics and Astronautics, naval vessel, metallurgy, chemical industry, how improving the labyrinth of Proportional valve and servovalve, is hydraulic transmission and emphasis and the difficult point of controlling area research.Domestic servovalve existing structure form, as limited angle rotating type current servovalve (patent No. 200410004538.6), adopt the valve core rotation of driven by Brush-Less DC motor rotary valve, dc brushless motor adopts three phase windings, and is furnished with position transducer (mechanical type, photoelectric or Hall transducer etc.).Because dc brushless motor needs the three-phase bridge power amplification circuit, winding adopts star or delta connection, and symmetrical two-phase can't be switched on simultaneously, therefore is easy to generate shake in the equilibrium position, causes the service behaviour instability of valve.Existing built-in angular position sensor is divided into potentiometer, selsyn, rotary transformer and photoelectric encoder, and the margin of error of potentiometer and selsyn is about 1 °, and the error effect of rotary transformer greatly reduces control accuracy; Photoelectric encoder may produce dead band angle and ambiguity error, and its feedback angle least unit value is bigger, and the feedback angle value is a discrete type, and control accuracy is difficult to improve.A kind of for another example digital hydraulic servo rotating valve (patent No. 86107688) and the straight control of numeral servovalve (patent No. 98201967), spool can only be followed stepper motor and be rotated in certain step angle, the minimum step angle of stepper motor is about 0.36 degree at present, and control accuracy is not high.Because stepper motor can only rotate step angle, makes the equipment of hydraulic control can't guarantee to stop at desired location at every turn.When valve core rotation was near zero-bit, the situation that existence can not the complete closed valve port can cause pressure oil to leak into active chamber.

Summary of the invention

The purpose of this utility model just provides a kind of simple in structurely, and the control accuracy height of hydraulic flow, pressure can be realized stepless speed regulation, frequency response height, dynamic characteristic are good, easy to install, and valve body is easy to clean, life-span is long, efficient height, hydraulic control valve applied widely.

Task of the present utility model is finished like this: design a kind of swing type hydraulic proportioning, servovalve, by overlapping cartridge spool in the valve body, two ends are by valve gap, the valve seat sealing connects, with swing motor and the angular displacement sensor formation that forms a complete set of, control by control chip, valve body is the cube parts, have vertical perforation valve opening installing spool, the front has oil supply hole, spill port, the back has the rising oilhole, the decline oilhole, be communicated with valve opening by inner oil pipe chamber respectively, end face, the bottom surface is used bolt and valve gap respectively, valve seat is connected and fixed, and spool is the end disc cross mandrel of joining shaft in addition, with the equipped three-position four-way valve of forming of valve body, the spool joining shaft passes bonnet central bore, connects the swing motor by coupling.Spool is installed in the middle valve opening of valve body, have circular groove around valve opening on valve body end face and the bottom surface, the installing valve seals, respectively offer 8 screws on the same circumferential surface in circular groove outer ring, be respectively applied for installing bolt and valve gap, valve seat connects, on the plane between the screw, have two positioning pin holes at interval, front at valve body has oil supply hole, spill port, the back has the rising oilhole, the decline oilhole, the four sides has some auxiliary holes, be communicated with the aperture installing plug screw shutoff of auxiliary hole, oil supply hole respectively by corresponding oil pipe chamber, spill port, the rising oilhole, the aperture of decline oilhole cooperates the installing pipe joint to connect transport pipe respectively.The cross mandrel of spool is that four axial notches are evenly left for 90 ° in the interval on the cylindrical body cross section, four dome faceted pebbles of corresponding formation constitute, two ends keep disc structure, bottom land is a concave circular arc shape, the groove top is the dome faceted pebble, and end valve core disk outside has the step type joining shaft, and collar has circular groove, installing stem seal circle, shaft end has keyway and is used for being connected and fixed with coupling.Valve gap is square thick metal plate, the center has axis hole, supporting with the spool joining shaft, on same circumferential surface, have 8 step holes around central shaft hole, corresponding with the screw of valve body end face, be used to install fixing bolt, on the plane between the step hole, have two positioning pin holes, corresponding with the positioning pin hole of valve body end face.Valve seat is the thick metal plate of rectangular, have step hole on four angles, be used to install fixing bolt, have 8 step holes on the same circumferential surface around the valve seat center, corresponding with the screw of valve body bottom surface, be used to install fixing bolt, on the plane between the step hole, have two positioning pin holes, corresponding with valve body bottom surface positioning pin hole.The swing motor is the output shafts structure, one end output shaft connects the joining shaft of spool by coupling, the other end output shaft links by the central shaft of coupling and angular displacement sensor, and the swing motor is connected control chip by wire harness respectively with angular displacement sensor.Angular displacement sensor is selected resistance type continuous type angular displacement sensor, at any time feedback information is returned control chip, by the pendulum angle and the frequency of control chip control swing rotor, determines the current value of each phase of swing motor.Swing driven by motor spool freely swings in certain angular range in the valve opening of valve body, the size of control valve body oilhole opening area, thus can be by the pendulum angle control hydraulic flow and the pressure of control swing motor.If hydraulic system is not too high to control accuracy and dynamic response requirement, when allowing to have certain meta dead band, the utility model can be used as Proportional valve.Do not need external feedback loop this moment, during Proportional valve work, preset the size of flow, pressure, control chip calculates the size of spool pendulum angle, determine the current value of each phase of swing motor in view of the above, and, make the output shaft rotation angle of swing motor consistent with predetermined value according to the resistance value control size of current that resistance type continuous type angular displacement sensor feeds back to.When if hydraulic system requires control valve to have high control precision and better dynamic response characteristic, can form the multichannel closed-loop system at the external feedback loop of the utility model structure, as servovalve.Can set the size of hydraulic flow, pressure according to need of work, calculate the spool pendulum angle, determine each phase current values of swing motor by control chip.When the hydraulic flow of valve body or pressure depart from setting value, control chip is in time regulated the input current amount of swing motor and the rotation angle of motor output shaft according to value of feedback, adjust the spool pendulum angle, change valve body oilhole opening area, make hydraulic flow, pressure recovery design load, satisfy required precision.The utility model is owing to adopted rotary valve structure and swing motor to drag, the flow and the pressure control of hydrovalve are converted into each the phase current control of swing motor, the swing motor internal has only two phase windings, the permanent-magnet material rotor is swung between two phase windings, and two phase winding can switch on simultaneously, need not position transducer, simplified control mode, improved control accuracy.The swing motor is the output shafts structure, and an end output shaft connects spool by coupling, and the other end output shaft connects resistance type continuous type angular displacement sensor by coupling, angle displacement can be converted into resistance value, the output angle value is continuous, and the control accuracy height can be realized stepless speed regulation.

According to above-mentioned design proposal make, test, prove of the present utility model reasonable in design, compact structure, stable performance, valve body oilhole opening area is adjustable, is convenient to clean, can realize stepless speed regulation, and can in hunting range, stop the control accuracy height in the arbitrary position, hydrovalve output flow and pressure are accurate, adjustable, and frequency response height, dynamic characteristic are good, flexible to operation, cost is low, efficient is high, long service life, applied widely, reached predetermined purpose preferably.

Description of drawings

Fig. 1 is an assembly structure generalized section of the present utility model;

Fig. 2 is the structural representation of looking up of valve gap of the present utility model (4);

Fig. 3 is the E-E generalized section of Fig. 2;

Fig. 4 is the V-V generalized section of Fig. 2;

Fig. 5 is the structural representation of looking up of valve seat of the present utility model (7);

Fig. 6 is the G-G generalized section of Fig. 5;

Fig. 7 is the H-H generalized section of Fig. 5;

Fig. 8 is that the D of the valve body (5) among Fig. 1 is to structural representation;

Fig. 9 is the K-K generalized section of Fig. 8;

Figure 10 is that the F of Fig. 8 is to plan view;

Figure 11 is the structural representation of facing of spool of the present utility model (6);

Figure 12 is the Y-Y generalized section of Figure 11;

Figure 13 is the B-B generalized section of Fig. 8;

Figure 14 is the P-P generalized section of Fig. 8;

Figure 15 is the T-T generalized section of Fig. 8;

Figure 16 is the A-A generalized section of Fig. 8;

Figure 17 is a three-position four-way valve schematic diagram of the present utility model;

Figure 18 is spool among Fig. 1 (6) meta state liquid flow diagram in valve body (5);

Figure 19 is the clockwise swing state liquid flow diagram of the spool (6) of Figure 18;

Figure 20 is spool (6) the counter-clockwise swing state liquid flow diagram of Figure 18;

Among the figure: the 1-sensor, the 2-coupling, 3-swings motor, 4-valve gap, 5-valve body, 6-spool, 7-valve seat, 8-stem seal circle, 9-valve seals, 10-plug screw; A-rising oilhole, B-decline oilhole, P-oil supply hole, T-spill port, the R-valve opening, S-pipe joint, L-transport pipe, J-axis hole, the M-screw, W-step hole, X-positioning pin hole, N-oil pipe chamber, α-angle, C-groove, U-auxiliary hole, Q-circular groove, E, V-valve gap section symbols, G, H-valve seat section symbols, K, A, P, T, B-valve body section symbols, Y-spool section symbols, D, F-line of vision symbol, I, II, III, IV-cavity.

Embodiment

Below in conjunction with accompanying drawing mode of execution of the present utility model is further specified.

Consult Fig. 1, the outer end output shaft of swing motor 3 is by the central shaft of coupling 2 angle of attachment displacement transducers 1, inner output shaft connects spool 6 joining shafts by coupling 2, and spool 6 is installed among the valve opening R at valve body 5 centers, and end face valve gap 4 and bottom surface valve seat 7 seal valve opening R.The back of valve seat 7 has rising oilhole A and decline oilhole B, is connected with transport pipe L by pipe joint S, and the auxiliary hole U that valve seat 7 vertical surfaces are opened prevents leakage of oil by plug screw 10 shutoff.Valve gap 4 and valve seat 7 usefulness bolts and valve body 5 are connected and fixed.

Consult Fig. 2, Fig. 3, Fig. 4, valve gap 4 is square thick sheet metal, the center has axis hole J, 8 step hole W are positioned on the same circumferential surface, respectively open a through hole in four angles, with axis hole J angle α is to have two positioning pin hole X on 135 ° the plane, and the joining shaft of central shaft hole J and spool 6 is equipped, can install bolt downwards by end face in the step hole W and be connected with the end face of valve body 5.

Consult Fig. 5, Fig. 6, Fig. 7, valve seat 7 is the thick metal plate of rectangular, has 8 step hole W on the same circumferential surface around the center, and is fixing by bottom surface installing bolt and valve body 5, respectively has step hole W on four angles, and it is fixing with valve seat 7 to be used for construction bolt.

Consult Fig. 8, Fig. 9, Figure 10, valve body 5 is cube parts, the centre has vertical valve opening R, equipped with spool 6, have a ring annular groove Q at valve body 5 end faces and bottom surface around valve opening R, be used to install valve seals 9, on the same circumferential surface of valve body 5 end faces and bottom surface, respectively have 8 screw M, be to have two positioning pin hole X on 135 ° the plane at the center of end face angle α, step hole W on end face screw M and positioning pin hole X and the valve gap 4 and the position of positioning pin hole X are corresponding, and bottom surface screw M is corresponding with valve seat 7 circumferential surface step hole W.Have decline oilhole B on the top, back of valve body 5, the bottom has rising oilhole A, the front has auxiliary hole U, is communicated with valve opening R by oil pipe chamber N respectively.

Consult Figure 11, Figure 12, spool 6 is evenly to have four axial arc groove C on cylindrical body, consequent four dome faceted pebbles form the cross mandrel, and the valve opening R inwall of dome faceted pebble and valve body 5 carries out match grinding processing, its precision decision leakage rate and output accuracy.Spool 6 two ends keep disk, can hydraulic oil be sealed in four cavitys (I chamber, II chamber, III chamber, IV chamber) of four groove C and the formation of valve opening R hole wall with the dome faceted pebble.One end has joining shaft, and the axle journal position has annular groove Q, can install stem seal circle 8, and the thin axle of axle head has positioning spline, can be equipped with coupling 2.

Consult Figure 13, Figure 14, Figure 15, Figure 16, the B-B of valve body 15, P-P, T-T, A-A four levels are analysed and observe, and upper strata, valve body 5 back has decline oilhole B, and R is communicated with valve opening, and be communicated with oil pipe chamber, right side N, valve body 5 right sides and front respectively have two auxiliary hole U.Valve body 5 front lower floors have oil supply hole P, the upper strata has spill port T, and oil supply hole P is communicated with oil pipe chamber N and valve opening R in the left side, and spill port T is communicated with valve opening R and is communicated with oil pipe chamber, right side N.Valve body 5 back lower floors have rising oilhole A, with about two auxiliary hole U arranged side by side is communicated with and the oil pipe chamber N connection valve opening R that is connected of the auxiliary hole U by valve body 5 left sides and the right side by the oil pipe chamber N in the valve body 5.Owing to be in the high pressure operating mode during hydrovalve work, in order to solve the imbalance that high pressure produces, prevent to impact, valve body 5 adopts symplex structure, designs at valve body 5 inner processing oil pipe chamber N for this reason, and oil supply hole P, spill port T, rising oilhole A, decline oilhole B respectively are divided into two branch roads, prop up the relative spool 6 of way outlet and form symmetry, each oilhole mouth connects transport pipe L by pipe joint S, and plug screw 10 shutoff are all used in the aperture that is used to process the auxiliary hole U of oil pipe chamber N, prevent that hydraulic oil from leaking.Distance between the external opening of each oilhole and auxiliary hole U can guarantee pipe joint S and or the normal mounting of plug screw 10.

Consult Figure 17, spool 6 and the valve body 5 equipped three-position four-way valves of forming, it is valve body 5 fuel feeding that oil supply hole P is communicated with oil pump by transport pipe L, and spill port T is communicated with fuel tank by transport pipe L, and rising oilhole A, decline oilhole B connect operating cylinder respectively by transport pipe L.When spool 6 mediated in valve opening R, rising oilhole A, decline oilhole B be by spool 6 shutoff, with oil supply hole P, spill port T to be connected oil circuit obstructed, hydrovalve flow, pressure are in the stationary equilibrium state.When spool 6 was swung clockwise, rising oilhole A was communicated with oil supply hole P, and decline oilhole B is communicated with spill port T; When spool 6 counter-clockwise swings, rising oilhole A is communicated with spill port T, and decline oilhole B is communicated with oil supply hole P.By the pendulum angle of control swing motor 3, can change the position of spool 6, control rising oilhole A, decline oilhole B form different connection combinations with oil supply hole P and spill port T, realize the control to flow rate of hydraulic system and pressure.

Consult Figure 18, Figure 19, Figure 20, valve body 5 is equipped with spool 6, form three-position four-way valve with each oilhole, regardless of spool 6 swaying directions, always there are the oil supply hole P of valve body 5 and the state that II chamber and IV chamber are communicated with, spill port T is communicated with I chamber and III chamber of spool 6, in fact form the II chamber, the IV chamber is a fuel supply chamber, I chamber, III chamber are the structural pattern of oil back chamber.When spool 6 was in the meta state, rising oilhole A, decline oilhole B were sealed by the cross dome faceted pebble of spool 6, all are not communicated with each cavity, and liquid stream can't circulate between each cavity.When spool 6 is swung clockwise, decline oilhole B is communicated with fuel supply chamber II chamber, IV chamber, high pressure oil is exported through decline oilhole B, lead to the chamber, top of oil cylinder through transport pipe L, the piston that presses oil cylinder drives piston rod decline retraction, the oilhole A that rises simultaneously is communicated with oil back chamber I chamber, III chamber, and by the chamber, the end of transport pipe L connection oil cylinder, the hydraulic oil in the chamber, the end flows back to fuel tank through rising oilhole A, spill port T transport pipe L.When spool 6 counter-clockwise swings, rising oilhole A is communicated with fuel supply chamber II chamber, IV chamber, and high pressure oil flows into rising oilhole A by oil supply hole P, leads to the chamber, the end of oil cylinder through transport pipe L, and the piston that promotes oil cylinder drives piston rod and protrudes upward work done; Decline oilhole B is communicated with oil back chamber I chamber, III chamber, and the hydraulic oil in chamber, oil cylinder top flows back to decline oilhole B through transport pipe L, flows back to fuel tank by spill port T and oil return transport pipe L.By the swaying direction of control spool 6, the fuel feeding direction that can controlled hydraulic system and the working state of oil cylinder; Pendulum angle by control spool 6 is determined the sectional area of rising oilhole A and decline oilhole B, can control the size and the pressure of hydraulic flow.

Adopting the utility model is that the hydraulic system oil cylinder is supporting, according to need of work, predetermined hydraulic flow and the force value of control chip input, the certain electric current of control swing motor 3 inputs, under the effect of motor windings electrical current, the rotor swing respective angles of swing motor 3, valve body 5 is by having the hydraulic oil of certain flow and pressure.When switching flow or direction, spool 6 turns to needed angle under swing motor 3 drives.If vibration or impact when making spool 6 depart from predetermined angle, resistance type continuous type angular displacement sensor 1 is passed to control chip with the angle value that records, and control chip is regulated the electrical current of swing motor 3, makes spool 6 pendulum angles reach predetermined value.Because valve port opening is little, can change flow or pressure rapidly, dynamic characteristic is good.Control chip cooperates with sensor, forms feedback loop, the validity height of control hydraulic flow and pressure, and Applicable scope is extensive.

Claims (6)

1. swing type hydraulic proportioning, servovalve, it is characterized in that it being by cover cartridge spool (6) in the valve body (5), two ends are by valve gap (4), valve seat (7) sealing connects, with swing motor (3) and angular displacement sensor (1) formation that forms a complete set of, control by control chip, valve body (5) is the cube parts, have vertical perforation valve opening (R) installing spool (6), the front has oil supply hole (P), spill port (T), the back has rising oilhole (A), decline oilhole (B), be communicated with valve opening (R) by inner oil pipe chamber (N) respectively, end face, the bottom surface is used bolt and valve gap (4) respectively, valve seat (7) is connected and fixed, spool (6) is the end disc cross mandrel of joining shaft in addition, with the equipped three-position four-way valve of forming of valve body (5), spool (6) joining shaft passes valve gap (4) center hole, connects swing motor (3) by coupling (2).

2. according to the described swing type hydraulic proportioning of claim 1, servovalve, the interior spool (6) of installing of middle valve opening (R) that it is characterized in that said valve body (5), have circular groove (Q) around valve opening (R) on valve body (5) end face and the bottom surface, installing valve seals (9), respectively offer 8 screws (M) on the same circumferential surface in circular groove (Q) outer ring, be respectively applied for installing bolt and valve gap (4), valve seat (7) connects, on the plane between the screw (M), have two positioning pin holes (X) at interval, have oil supply hole (P) in the front of valve body (5), spill port (T), the back has rising oilhole (A), decline oilhole (B), the four sides has some auxiliary holes (U), be communicated with by corresponding oil pipe chamber (N) respectively, aperture installing plug screw (10) shutoff of auxiliary hole (U), oil supply hole (P), spill port (T), rising oilhole (A), the aperture of decline oilhole (B) cooperates installing pipe joint (S) to connect transport pipe (L) respectively.

3. according to the described swing type hydraulic proportioning of claim 1, servovalve, the cross mandrel that it is characterized in that said spool (6) is that four axial notches (C) are evenly left for 90 ° in the interval on the cylindrical body cross section, four dome faceted pebbles of corresponding formation constitute, two ends keep disc structure, bottom land is a concave circular arc shape, the groove top is the dome faceted pebble, one end valve core (6) disk outside has the step type joining shaft, collar has circular groove (Q), installing stem seal circle (8), shaft end have keyway and are used for being connected and fixed with coupling (2).

4. according to the described swing type hydraulic proportioning of claim 1, servovalve, it is characterized in that said valve gap (4) is square thick metal plate, the center has axis hole, supporting with spool (6) joining shaft, on same circumferential surface, have 8 step holes (W) around central shaft hole, corresponding with the screw of valve body (5) end face, be used to install fixing bolt, on the plane between the step hole (W), have two positioning pin holes (X), corresponding with the positioning pin hole (X) of valve body (5) end face.

5. according to the described swing type hydraulic proportioning of claim 1, servovalve, it is characterized in that said valve seat (7) is the thick metal plate of rectangular, have step hole (W) on four angles, be used to install fixing bolt, have 8 step holes (W) on the same circumferential surface around valve seat (7) center, corresponding with the screw (M) of valve body (5) bottom surface, be used to install fixing bolt, on the plane between the step hole (W), have two positioning pin holes (X), corresponding with valve body (5) bottom surface positioning pin hole (X).

6. according to the described swing type hydraulic proportioning of claim 1, servovalve, it is characterized in that said swing motor (3) is the output shafts structure, one end output shaft connects the joining shaft of spool (6) by coupling (2), the other end output shaft links by the central shaft of coupling (2) with angular displacement sensor (1), and swing motor (3) is connected control chip by wire harness respectively with angular displacement sensor (1).

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