CN105822795A - Inclined trough type 2D electro-hydraulic high-speed switching valve with variable transmission ratio transmission mechanism - Google Patents

Abstract

An inclined trough type 2D electro-hydraulic high-speed switching valve with a variable transmission ratio transmission mechanism comprises a valve body, the transmission mechanism for driving the valve body to be opened and a zero position keeping mechanism for driving the valve body to be closed. An oil inlet cavity communicates with an oil inlet in the valve body and communicates with a valve element through an oil passing hole in the valve element. High-pressure holes communicate with the valve element, and a sensitive cavity communicates with the oil inlet cavity through the oil passing hole, the high-pressure holes and inclined troughs. The sensitive cavity communicates with an oil outlet cavity through low-pressure troughs and the inclined troughs, and the oil outlet cavity communicates with an oil outlet in the valve body. The length, in the axial direction, of a second circular bead is larger than the diameter of the oil outlet, and the oil outlet is located in the motion track of the second circular bead. The lower half part of an upper lifting lever extends into a U-shaped fork of a lower shifting fork, a rotating shaft of rotating equipment is fixedly connected with the upper lifting lever, and a reset spring of the upper lifting lever enables the upper lifting lever to abut against the interior of the lower shifting fork in an inclined manner. The zero position keeping mechanism for forcing the valve body to be kept at the zero position is arranged on the right side of the valve body.

Description

Chute type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism

technical field

The invention relates to an on-off valve, in particular to a chute type 2D electro-hydraulic high-speed on-off valve with a variable transmission ratio transmission mechanism.

Background technique

High-speed switching valves have become an important direction for the development of electro-hydraulic digital control technology, and are widely used in aerospace, hydraulic locking, engineering machinery, and military applications. In recent years, as an important part of electro-hydraulic digital control technology and as a key component to realize electro-hydraulic digital control, high-speed switching valves have put forward higher requirements, that is, they must have high pressure resistance, fast response, large flow, Good sealing performance and other advantages.

At present, high-speed switching valves often adopt ball valve, slide valve and cone valve core structures. The ball valve spool has simple structure, good process performance, relatively sensitive action, short stroke and good dynamic performance, but the spool is easily affected by hydraulic power and can only be made into a small-diameter valve. The slide valve spool is easy to obtain hydraulic power compensation and hydraulic balance, but the spool stroke is short, the response is slow, the processing technology and assembly precision are low, and the sealing performance is poor. It can only be used in some occasions that require low flow, pressure and sealing performance. Choose. Compared with the two, the cone valve spool can overcome the problems of short stroke and large leakage of the spool valve spool, and can also overcome the problems of hydraulic power imbalance of the ball valve spool, and has fast response and oil flow capacity. Strong, good sealing performance, strong anti-pollution ability and so on. However, when used in special environments such as high pressure and high frequency response, for this type of valve, it is necessary to ensure reliable sealing performance and ensure that the valve core is not stuck. The processing accuracy is extremely high, and the processing technology is difficult. The high cost is not conducive to the wide application of this type of valve.

In recent years, the 2D electro-hydraulic high-speed switching valve using the principle of the servo screw mechanism has dual degrees of freedom of radial rotation and axial movement of the spool, flexible control, high precision, fast frequency response, low hysteresis, small leakage, and structural Simple and other advantages, it is currently mainly used in military fields such as aerospace and missiles, and most of them are in extremely harsh environments. When the controller of the 2D electro-hydraulic high-speed switching valve is energized, the electrical signal is converted into a mechanical signal by the electro-mechanical converter, and transmitted to the mechanical transmission mechanism to amplify the driving torque output by the electro-mechanical converter and drive the valve core turn. However, it is more difficult to process the spool of this type of valve, and the through hole on the spool has a greater impact on the spool under high pressure and high vibration, which reduces the rigidity of the spool and is easy to break at the through hole; And the plug at the tail of the spool is easily washed out when the pressure is too high, causing damage to the overall structure of the valve body. And under high pressure, the "clamping" phenomenon of the valve core will easily cause the flow rate to fail to increase.

Contents of the invention

In order to overcome the above problems, the present invention provides a chute-type 2D electro-hydraulic high-speed on-off valve with a variable transmission ratio transmission mechanism.

Technical scheme of the present invention is:

The chute-type 2D electro-hydraulic high-speed on-off valve with a variable transmission ratio transmission mechanism includes a valve body, a transmission mechanism that drives the valve body to open, and a zero position holding mechanism that drives the valve body to close;

The valve body includes a servo screw mechanism composed of a valve body and a spool. The spool is rotatably set in the valve body. The spool is provided with a first shoulder, a second shoulder and a third shoulder in turn from left to right. The valve The left end cover of the body and the first shoulder airtightly enclose the inner chamber of the valve into a sensitive chamber, the first shoulder and the second shoulder airtightly enclose the inner chamber of the valve into an annular oil outlet chamber surrounding the valve core, and the second The shoulder and the third shoulder airtightly enclose the inner chamber of the valve into an annular oil inlet chamber surrounding the valve core;

The oil inlet chamber communicates with the oil inlet on the valve body, and the oil inlet chamber communicates with the valve core through the oil hole on the valve core; a pair of axisymmetric high-pressure holes and a pair of axisymmetric high pressure holes are respectively opened on the first shoulder. Low-pressure grooves, and high-pressure holes and low-pressure grooves are arranged alternately. The high-pressure holes communicate with the valve core. A pair of axially symmetrical chute is arranged on the inner wall of the valve body. One end of the chute communicates with the sensitive chamber, and the other end of the chute is located at the high-pressure hole On the track of motion and the track of low pressure groove, the sensitive chamber communicates with the oil inlet chamber through the oil hole, high pressure hole and chute;

The sensitive chamber communicates with the oil outlet chamber through the low-pressure groove and the chute, and the oil outlet chamber communicates with the oil outlet on the valve body; the axial length of the second shoulder is greater than the diameter of the oil outlet, so that the second shoulder When the spool is in the closed state, the oil outlet is completely sealed, and the oil outlet is located on the movement track of the second shoulder;

The transmission mechanism arranged on the right side of the valve body includes an upper shift lever located directly above and a lower shift fork located directly below. The lower half of the upper shift rod is oval, and the upper half of the lower shift fork is U-shaped with an upward opening. The lower half of the upper shift lever extends into the U-shaped fork of the lower shift fork, and the rotating shaft of the rotating device is fixedly connected with the upper shift lever to drive the upper shift lever to drive the lower shift fork to rotate, and the bottom of the lower shift fork is connected to the The right end of the spool is fixedly connected to drive the spool to rotate synchronously; the top of the upper lever is slidably set on the horizontal rod, and one end of the horizontal rod is set with an upper lever that presses the upper lever to the zero position for reset Spring, the return spring of the upper shift lever tilts the upper shift lever against the lower shift fork;

The right end of the spool runs through the valve body, and the right side of the valve body is provided with a zero position holding mechanism that forces the valve body to maintain a zero position. One end of the spring is pressed against the right side of the third shoulder, forcing the second shoulder to be located above the oil outlet and seal the oil outlet, and the other end is pressed against the circlip fixedly sleeved on the spool.

Further, the rotating device is a rotating electromagnet.

Further, a high-pressure groove is provided at the outlet end of the high-pressure hole, and the high-pressure hole communicates with the chute through the high-pressure groove, and the distance between the low-pressure groove and the high-pressure groove is equal to the width of the chute.

Further, a connecting seat is provided on the right side of the valve body, the zero position maintaining mechanism is arranged in the connecting seat, the transmission mechanism is arranged on the connecting plate above the connecting seat, and the connecting seat is airtightly connected with the valve body through the first sealing ring.

Further, the right end of the valve core is airtightly connected to the connecting seat through the second sealing ring; the left end cover is airtightly connected to the valve body through the third sealing ring.

Further, the left end of the valve core return spring is pressed against the right side of the third shoulder through the spring seat, and the right end of the valve core return spring is pressed against the jump ring through the spring pad, and the spring seat and the spring pad are both fixed sleeves. located on the spool.

Further, the return spring of the upper driving rod is pressed against the upper driving rod through a gasket, and the gasket is slidably arranged on the horizontal bar.

Further, the chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism according to claim 6 is characterized in that: the connecting seat and the connecting plate are equipped with a box cover.

Further, the rotating electromagnet is arranged above the valve body and equipped with a protective cover.

Further, the upper shift lever is clamped on the output shaft of the rotary electromagnet by a first screw, and the lower shift fork is clamped on the valve core by a second screw.

Technical idea of the present invention is:

In order to make the 2D electro-hydraulic high-speed switching valve have large flow rate and high-frequency response characteristics, in addition to ensuring that the electro-mechanical converter, that is, the rotating electromagnet has fast response characteristics, it is also necessary to ensure that the axial displacement of the spool of the servo screw mechanism has a large impact on the rotation angle. The displacement has the characteristics of quick response, and in addition, the mechanical transmission mechanism must also meet the large driving torque required for the operation of the spool.

The servo screw mechanism is a guiding and controlling structure that realizes the conversion between the rotation angle of the switch valve spool and the axial linear displacement. There is a chute on the left end of the inner wall of the valve, the chute g communicates with the sensitive chamber f, and two pairs of axisymmetric high-pressure grooves 1311 and low-pressure grooves b are formed on the first shoulder of the valve core. Both the high-pressure groove 1311 and the low-pressure groove b are grooves with an irregular parallelogram shape in cross section. The high-pressure groove 1311 and the low-pressure groove b are located on both sides of the chute g, and the distance between the high-pressure groove 1311 and the low-pressure groove b is equal to the width of the chute. Equal to increase the area gradient to meet the requirements of large flow and high frequency response for 2D electro-hydraulic high-speed switching valves. The spool is rotatably installed in the valve body. One end of the chute g communicates with the sensitive chamber f, and the other end forms a resistance half-bridge with the high-pressure groove 1311 and low-pressure groove b. The resistance half-bridge controls the pressure in the sensitive chamber f through the chute g .

In order to ensure that the 2D electro-hydraulic high-speed switching valve has the characteristics of large flow and high frequency response, it is necessary to ensure that the axial displacement of the spool of the hydraulic servo screw mechanism can respond quickly to the rotational angular displacement. The natural frequency of the hydraulic servo screw mechanism depends on the spool The volume of the sensitive chamber f at the end and the mass of the spool, and the structural characteristics of the 2D electro-hydraulic high-speed switching valve determine that the sensitive chamber f can be designed to be small, so its hydraulic natural frequency is very high, about 10 ⁴ ~ 10 ⁵ Hz. With such a high hydraulic natural frequency, the second-order oscillation will not affect the dynamic response of the spool, and the axial movement of the spool will not affect the response to the input rotation angle signal. The second-order oscillation can be simplified into an inertial link.

Due to the high natural frequency of the hydraulic servo screw mechanism, the designed high-pressure groove 1311, low-pressure groove b and inclined groove adopt the positive covering method, and the covering amount is 0.003-0.007mm, which can ensure that the zero leakage of the pilot and control stage is very small, and the valve core can be improved. The conversion accuracy between angular displacement and axial displacement can make the axial stiffness of the valve core very large, effectively improving the reliability and stability of the 2D electro-hydraulic high-speed switching valve.

The chute-type hydraulic servo screw mechanism has a high self-cleaning ability. As long as one side of the parallelogram area formed by the high-pressure groove 1311, the low-pressure groove b and the inclined groove is blocked, the force balance of the valve core will be destroyed, and the valve core will move axially, and the blocking area will increase during the movement, which can effectively Clear obstacles, strong anti-pollution ability.

In order to improve the response speed of the present invention, it is necessary to increase the driving torque for driving the spool to rotate. The designed transmission mechanism can obtain infinite driving torque when the spool starts to work. The transmission ratio between the designed forks and levers is infinite. After the rotating electromagnet is energized, the torque is output. The driving torque is amplified infinitely through the transmission mechanism of the forks and levers, and the valve core is driven to rapidly rotate radially and move axially to overcome Hydraulic clamping force improves the anti-pollution ability of the valve and reduces the machining accuracy of the valve core. This transmission mechanism is also applicable to the three-position four-way 2D electro-hydraulic high-speed switching valve.

The beneficial effects of the present invention are:

1. The chute-type hydraulic servo screw mechanism is adopted, and the irregular parallelogram high-pressure groove and low-pressure groove are used to increase the area gradient, and the response speed is fast and the processing is simple;

2. The transmission mechanism with variable transmission ratio is adopted to effectively amplify the driving torque of the spool to overcome the hydraulic clamping force at the spool, and at the same time reduce the input torque requirements for the electro-mechanical converter;

3. Fast frequency response and good dynamic performance;

4. The moment of inertia of the zero position holding mechanism is small, the leakage of the zero position control is small, and the precision is high;

5. Simple structure and low processing cost;

6. Low requirements on oil filtration precision and strong anti-pollution ability.

Description of drawings

Fig. 1 is a schematic diagram of the structure principle of the present invention.

Figure 2 is an enlarged schematic view of the high-pressure tank and the low-pressure tank.

Figure 3 is a schematic structural view of the valve core.

Figure 4 is a schematic diagram of the principle of the servo screw mechanism.

Fig. 5 is a sectional view along E-E in Fig. 4 .

Fig. 6 is a structural schematic diagram of the transmission mechanism.

detailed description

As shown in the figure, the chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism includes the valve body, the transmission mechanism that drives the valve body to open, and the zero position holding mechanism that drives the valve body to close;

The valve body includes a servo screw mechanism composed of a valve body 22 and a valve core 13. The valve core 13 is rotatably arranged in the valve body 22. The valve core 13 is provided with a first shoulder 131 and a second shoulder in turn from left to right. 132 and the third shoulder 133, the left end cover 24 and the first shoulder 131 of the valve body 22 airtightly enclose the inner cavity of the valve body 22 into a sensitive cavity f, and the first shoulder 131 and the second shoulder 132 seal the valve body 22. The inner chamber of the valve body 22 is airtightly enclosed to form an annular oil outlet chamber m surrounding the spool 13. The second shoulder 132 and the third shoulder 133 enclose the inner chamber of the valve body 22 airtightly to form an annular oil inlet chamber surrounding the spool 13. n;

The oil inlet chamber n communicates with the oil inlet P on the valve body 22, and the oil inlet chamber n communicates with the valve core 13 through the oil hole c on the valve core 13; a pair of axially symmetrical The high-pressure hole a and a pair of axisymmetric low-pressure grooves b, and the high-pressure holes and low-pressure grooves are arranged alternately, the high-pressure hole a communicates with the valve core 13, and a pair of axisymmetric chute g is provided on the inner wall of the valve body 22, the chute g One end of the chute communicates with the sensitive chamber f, the other end of the chute g is located on the trajectory of the high-pressure hole a and the trajectory of the low-pressure groove b, and the sensitive chamber f connects with the oil inlet chamber through the oil hole c, the high-pressure hole a and the chute g n connected;

The sensitive chamber f communicates with the oil outlet chamber m through the low-pressure groove b and the chute g, and the oil outlet chamber m communicates with the oil outlet A on the valve body 22; the length of the second shoulder 132 in the axial direction is greater than that of the oil outlet A so that the second shoulder 132 completely seals the oil outlet A when the spool 13 is in the closed state, and the oil outlet A is located on the movement track of the second shoulder 132;

The transmission mechanism arranged on the right side of the valve body includes an upper shift lever 10 directly above and a lower shift fork 12 directly below, the lower half of the upper shift lever 10 is oval, and the upper half of the lower shift fork 12 is an opening Upward U-shaped fork, the lower half of the upper shift lever 10 extends into the U-shaped fork of the lower shift fork 12, and the rotating shaft of the rotating device is fixedly connected with the upper shift lever 10 to drive the upper shift lever 10 to drive the lower shift fork 12 Rotate, and the bottom of the lower shift fork 12 is fixedly connected with the right end of the valve core 13 to drive the valve core 13 to rotate synchronously; the top of the upper shift lever 10 is slidably arranged on the horizontal rod 2, and one end of the horizontal rod 2 There is an upper lever return spring 5 that presses the upper lever 10 to the zero position, and the upper lever return spring 5 tilts the upper lever 10 against the lower fork 12;

The right end of the valve core 12 runs through the valve body 22, and the right side of the valve body 22 is provided with a zero position holding mechanism that forces the valve body 22 to maintain a zero position. Spring 19, one end of the spool return spring 19 is pressed against the right side of the third shoulder 133, forcing the second shoulder 132 to be located above the oil outlet A and seal the oil outlet A, and the other end is pressed against the solid sleeve On the snap ring 17 on the spool 13.

The rotating device is a rotating electromagnet 9 .

A high-pressure groove 1312 is provided at the outlet end of the high-pressure hole a, and the high-pressure hole a communicates with the chute through the high-pressure groove, and the distance between the low-pressure groove 1311 and the high-pressure groove 112 is equal to the width of the chute g.

The right side of the valve body 22 is provided with a connecting seat, the zero position holding mechanism is arranged in the connecting seat, and the transmission mechanism is arranged on the connecting plate 1 above the connecting seat, and the connecting seat is airtight with the valve body 22 through the first sealing ring 21 connect,

The right end of the valve core 13 is airtightly connected with the connecting seat through the second sealing ring 16 .

The left end of the spool return spring 19 is pressed against the right side of the third shoulder 133 by the spring seat 20, and the right end of the spool return spring 19 is pressed against the jump ring 17 by the spring pad 18, the spring seat 20 and The spring pads 18 are fixedly sleeved on the valve core 13 .

The return spring 5 of the upper driving rod is pressed against the upper driving rod 10 through the gasket 4 , and the gasket 4 is slidably arranged on the horizontal bar 2 .

The left end cover 24 is airtightly connected with the valve body 22 through the third sealing ring 23 .

Described connecting seat and connecting plate are equipped with box cover 11.

The rotating electromagnet 9 is arranged above the valve body 22 and equipped with a protective cover 26 .

The upper shift lever 10 is clamped on the output shaft of the rotary electromagnet 9 by the first screw 8 , and the lower shift fork 12 is clamped on the valve core 13 by the second screw 14 .

Rotating electromagnet 9 links to each other with controller.

The rotating electromagnet 9, as the electro-mechanical converter of the present invention, is located above the valve body 22, and is connected with the connecting plate 1 by the first screw 28, and the protective cover 26 is connected with the connecting plate 1 by the second screw 27, and simultaneously The lid 11 is connected to the protective cover 26 by the third screw 3, the support 7 of the horizontal bar 2 is fixed on the connecting plate 1 by the third screw 6, and the left end cover 24 is fixed on the valve body 22 by the fourth screw 25.

(1) Servo screw mechanism:

The servo screw mechanism is a guide and control mechanism to realize the conversion between the rotation angle of the switch valve spool and the axial linear displacement. It includes the valve body 22 and the spool 13. The cross section of 1311 and low-pressure groove b is an irregular parallelogram, the high-pressure groove 1311 and the low-pressure groove b are respectively located on both sides of the chute, and the distance between the high-pressure groove 1311 and the low-pressure groove b is equal to the width of the chute g, so that Increase the area gradient, reduce the difficulty of processing technology, and meet the requirements of 2D electro-hydraulic high-speed switching valve with large flow rate and fast frequency response. One end of the chute g communicates with the sensitive chamber f, and the other end forms a resistance half-bridge with the high-pressure groove 1311 and the low-pressure groove b, and the resistance half-bridge controls the pressure in the sensitive chamber f through the chute g.

When the spool 13 was at the zero position (that is, when the present invention was in the closed state), the side of the second shoulder 132 completely sealed the oil outlet A, and one end of the chute g covered the high-pressure groove 1311 and the low-pressure groove b simultaneously, and both The coverage area is equal, and the other end of the chute g communicates with the sensitive chamber f.

The oil enters the oil inlet chamber n through the oil inlet P, the pressure in the oil inlet chamber n is p ₁ , the oil in the oil inlet chamber n enters the valve core 22 through the oil hole c, and overflows from the high pressure hole a Into the high-pressure groove 1311, the oil in the high-pressure groove 1311 enters the sensitive chamber f through the chute g, the oil in the sensitive chamber f enters the low-pressure groove b through the chute g, and enters the oil outlet chamber m from the low-pressure groove b Inside, because the oil outlet A is sealed, the oil will not flow out. If the friction force and the influence of the hydraulic power of the valve port are not considered in the static state, the intersecting areas of the high-pressure groove 1311, the low-pressure groove b and the chute g are equal, and the sensitive chamber The pressure in f is only half of the pressure (system pressure) in the oil inlet chamber n, but if the cross section of the sensitive chamber f is set to be twice the cross section of the oil inlet chamber n, the spools 13 are respectively located in the sensitive chamber f It is equal to the pressure at both ends in the oil inlet chamber n, the spool 13 maintains static pressure balance in the axial direction, and the on-off valve is in the zero position state.

If the spool 13 rotates, the intersecting area of the high-pressure groove 1311 and the low-pressure groove b on the spool 13 and the chute g on the valve body 22 will change, thereby causing the pressure in the sensitive chamber f to change, and the force balance of the spool 13 will be destroyed , and then the spool 13 produces axial movement.

As shown in Figure 4, when the transmission mechanism drives the spool 13 to rotate clockwise, the intersection area of the high-pressure groove 1311 and the chute g decreases, and the intersection area of the low-pressure groove b and the chute g increases, causing the pressure in the sensitive chamber f Lowering, the spool 13 moves to the left, the second shoulder 132 moves away from the oil outlet A, the valve opens, and the oil flows out. If the spool 13 continues to rotate counterclockwise, the intersecting area of the high-pressure groove 1311 and the chute g gradually increases, and the intersection area of the low-pressure groove b and the chute g gradually decreases until the intersection area of the high-pressure groove 1311 and the chute g, When the intersecting areas of the low-pressure groove b and the chute g are equal again, the axial force of the spool 13 is balanced, the spool 13 stops moving, and enters a balanced state again; on the contrary, when the spool 13 rotates counterclockwise, the above change process is just the opposite . Therefore, the present invention is a two-stage high-speed on-off valve with dual degrees of freedom of movement, and the relationship between the angular displacement and the axial displacement of the spool is linear. The function is to push the valve core to move axially under the action of oil pressure difference, so as to realize the high-speed opening and closing of the valve port.

(2) transmission mechanism

The rotation range of the rotary electromagnet 9 is 21°, the rotary electromagnet 9 drives the upper lever 10 to rotate counterclockwise, then the upper lever 10 drives the lower shift fork 12 and the valve core 13 to rotate clockwise, and the high pressure groove 1311 intersects with the chute g The area of the low-pressure groove b and the chute g increases, causing the pressure in the sensitive chamber f to decrease, and the valve core 13 moves to the left, then the second shoulder 132 moves away from the oil outlet A, and the oil outlet Port A is unimpeded, and the oil liquid flows out, thereby the present invention is in open state.

However, frictional force, hydraulic power, oil pollution and the processing accuracy of the valve core and valve body will generate greater resistance at the moment of the valve core rotation, which is prone to hydraulic "stuck" phenomenon. In order to prevent the hydraulic "stuck" phenomenon from occurring in the present invention , the transmission mechanism must have a larger torque at the moment of starting.

The transmission mechanism of the present invention can realize variable torque, and the lower half of the upper driving rod 10 is oval to realize variable transmission ratio. Since the rotation range of the rotating electromagnet 9 is 21°, in order to facilitate assembly, and realize the upper driving rod 10 Symmetrical design, the initial installation position of the upper shift lever 10 (i.e. the zero position) deviates from the line connecting the rotation center of the upper shift lever 10 and the lower shift fork 12 by 21°, and the upper shift lever 10 and the lower shift fork 12 are line contact fit , and the upper shift lever 10 and the lower shift fork 12 intersect at point R and point S respectively, as shown in FIG. 5 . At this time, the normal line of the contact point R just passes through the rotation center of the upper shift lever 10. According to the "three-center theorem", the relative instantaneous centers of the upper shift lever 10 and the lower shift fork 12 coincide, and the instantaneous transmission ratio of the transmission mechanism is infinite. The response of the lower shift fork 12 to the upper shift rod 10 is equivalent to an impact response, and the output torque is large enough to overcome the phenomenon of hydraulic "sticking".

As the upper shift lever 10 continues to move, the center of rotation of the lower shift fork 12 approaches relative to the instantaneous center. It can be seen from the instantaneous center theorem that the transmission ratio of the upper shift lever 10 and the lower shift fork 12 is inversely proportional to the distance from the respective rotation centers to the instantaneous center, so the transmission ratio decreases accordingly, but it is sufficient to meet the required rotational torque of the spool 13 after it is activated. .

Compared with the existing fixed transmission ratio transmission mechanism, the transmission mechanism of the present invention will generate infinite torque at the beginning of the movement, so as to overcome the 2D electro-hydraulic high-speed switching valve that is easily affected by friction, hydraulic power, oil pollution and valve core and valve body processing. Accuracy and other issues will cause hydraulic "sticking" phenomenon to the spool.

In order to ensure that the spool 13 can still be in the zero position when the controller of the on-off valve is not energized or fails, a shift fork return spring 5 is installed on the horizontal rod 2, and the return spring 5, the horizontal rod 2 and the gasket 4 form an upper The limit mechanism of the shift fork. The upper shift fork will rotate counterclockwise after starting, and press the upper shift fork return spring 5 through the gasket 4. When the upper shift fork rotates to the maximum position and stops rotating, both the upper shift fork and the return spring 5 are in a static state. When the controller is powered off, the shift fork return spring 5 drives the upper shift fork to reset.

In order to improve the working stability of the present invention and balance the inertial force, it is necessary to coincide the center of gravity of the upper shift lever 10 and the first screw 8 with the center of the rotor shaft of the rotating electromagnet 9, and the central axis of the spool 13 and the lower shift fork 12 and The centers of gravity of the second screws 14 coincide.

(3) Zero position holding mechanism

The spool 13 is equipped with a circlip 17, a spring pad 18, a spool return spring 19 and a spring seat 20 to prevent the spool 13 from moving inside the valve body 22 during the transportation of the on-off valve, and to ensure that the spool 13 does not move when zeroing. The smooth axial movement prevents collision with the valve body 22 and at the same time ensures that the valve core is at absolute zero position when the controller is not powered on.

The moment the valve body is opened, the spool moves to the left and presses the spool return spring 19. When the controller is powered off, the return spring 19 drives the spool 13 to move to the right and return to zero, and the present invention is in the closed state.

In Figure 1, T is the oil return port.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also includes those skilled in the art. Equivalent technical means conceivable according to the concept of the present invention.

Claims (10)

1. The chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism is characterized in that it includes a valve body, a transmission mechanism that drives the valve body to open, and a zero position holding mechanism that drives the valve body to close; The valve body includes a servo screw mechanism composed of a valve body and a spool. The spool is rotatably set in the valve body. The spool is provided with a first shoulder, a second shoulder and a third shoulder in turn from left to right. The valve The left end cover of the body and the first shoulder airtightly enclose the inner chamber of the valve into a sensitive chamber, the first shoulder and the second shoulder airtightly enclose the inner chamber of the valve into an annular oil outlet chamber surrounding the valve core, and the second The shoulder and the third shoulder airtightly enclose the inner chamber of the valve into an annular oil inlet chamber surrounding the valve core; The oil inlet chamber communicates with the oil inlet on the valve body, and the oil inlet chamber communicates with the valve core through the oil hole on the valve core; a pair of axisymmetric high-pressure holes and a pair of axisymmetric high pressure holes are respectively opened on the first shoulder. Low-pressure grooves, and high-pressure holes and low-pressure grooves are arranged alternately. The high-pressure holes communicate with the valve core. A pair of axially symmetrical chute is arranged on the inner wall of the valve body. One end of the chute communicates with the sensitive chamber, and the other end of the chute is located at the high-pressure hole On the track of motion and the track of low pressure groove, the sensitive chamber communicates with the oil inlet chamber through the oil hole, high pressure hole and chute; The sensitive chamber communicates with the oil outlet chamber through the low-pressure groove and the chute, and the oil outlet chamber communicates with the oil outlet on the valve body; the axial length of the second shoulder is greater than the diameter of the oil outlet, so that the second shoulder When the spool is in the closed state, the oil outlet is completely sealed, and the oil outlet is located on the movement track of the second shoulder; The transmission mechanism arranged on the right side of the valve body includes an upper shift lever located directly above and a lower shift fork located directly below. The lower half of the upper shift rod is oval, and the upper half of the lower shift fork is U-shaped with an upward opening. The lower half of the upper shift lever extends into the U-shaped fork of the lower shift fork, and the rotating shaft of the rotating device is fixedly connected with the upper shift lever to drive the upper shift lever to drive the lower shift fork to rotate, and the bottom of the lower shift fork is connected to the The right end of the spool is fixedly connected to drive the spool to rotate synchronously; the top of the upper lever is slidably set on the horizontal rod, and one end of the horizontal rod is set with an upper lever that presses the upper lever to the zero position for reset Spring, the return spring of the upper shift lever tilts the upper shift lever against the lower shift fork; The right end of the spool runs through the valve body, and the right side of the valve body is provided with a zero position holding mechanism that forces the valve body to maintain a zero position. One end of the spring is pressed against the right side of the third shoulder, forcing the second shoulder to be located above the oil outlet and seal the oil outlet, and the other end is pressed against the circlip fixedly sleeved on the spool. 2. The chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism according to claim 1, characterized in that: the rotating device is a rotating electromagnet. 3. The chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism as claimed in claim 2, characterized in that: the outlet end of the high-pressure hole is provided with a high-pressure groove, and the high-pressure hole passes through the high-pressure groove and the slant The grooves are connected, and the distance between the low-pressure groove and the high-pressure groove is equal to the width of the chute. 4. The chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism as claimed in claim 3, characterized in that: the right side of the valve body is provided with a connecting seat, and the zero position holding mechanism is arranged in the connecting seat, The transmission mechanism is arranged on the connecting plate above the connecting seat, and the connecting seat is airtightly connected with the valve body through the first sealing ring. 5. The chute type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism as claimed in claim 4, characterized in that: the right end of the valve core is airtightly connected with the connecting seat through the second sealing ring; The three sealing rings are airtightly connected with the valve body. 6. The chute-type 2D electro-hydraulic high-speed on-off valve with variable transmission ratio transmission mechanism as claimed in claim 5, characterized in that: the left end of the spool return spring presses against the right side of the third shoulder through the spring seat , and the right end of the spool return spring is pressed against the jump ring by the spring pad, and the spring seat and the spring pad are both fixedly sleeved on the spool. 7. The chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism according to claim 6, characterized in that: the return spring of the upper driving rod is pressed against the upper driving rod through a gasket, and the gasket slidably arranged on the horizontal bar. 8. The chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism according to claim 7, characterized in that: the connecting seat and the connecting plate are equipped with a box cover. 9. The chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism according to claim 8, characterized in that: the rotating electromagnet is arranged above the valve body and equipped with a protective cover. 10. The chute-type 2D electro-hydraulic high-speed switch valve with variable transmission ratio transmission mechanism as claimed in claim 9, characterized in that: the upper lever is clamped on the output shaft of the rotating electromagnet by the first screw, The lower shift fork is clamped on the valve core by the second screw.