Single-sided thin film feedback throttler with actively adjustable pre-pressure and use method of single-sided thin film feedback throttler

Abstract

The invention discloses a single-face film feedback throttler with actively adjustable pre-pressure and a using method, the single-face film feedback throttler comprises an upper-section fluid body, a lower-section fluid body and a micro servo electric cylinder, a layer of elastic film is arranged between the upper-section fluid body and the lower-section fluid body, and a pre-pressing cavity is formed between the bottom of the upper-section fluid body and the elastic film due to the arrangement of the film; a linear push rod of the micro servo electric cylinder in the pre-pressing cavity extrudes pressure oil in the pre-pressing cavity; a throttling cavity is formed between the top of the lower throttling body and the elastic film, a throttling table is further arranged at the top of the lower throttling body, the throttling cavity is communicated with the lower oil outlet hole through a throttling gap between the throttling table and the elastic film, and the pressure of pressure oil in the pre-pressing cavity is changed through movement of the linear push rod of the micro servo electric cylinder. The elastic film is slightly deformed, so that the throttling characteristic is changed; the lower throttling body is provided with an oil supply hole which is communicated with the annular oil supply groove; and the lower-section fluid is provided with a pressure sensor.

Description

Technical Field

[0001] The present invention belongs to the hydrostatic technology field in precision machinery, and particularly relates to a single-sided film feedback restrictor with actively adjustable pre-pressure and its usage method. Background Art

[0002] The hydrostatic technology plays a crucial role in the field of precision machinery, especially in the applications of key components such as hydrostatic guides, hydrostatic bearings, and hydrostatic lead screws. In these hydrostatic systems, the restrictor is a key component in the hydrostatic device, and its performance directly determines the working efficiency of the entire system. Therefore, its design and optimization have become the core of technological development. Restrictors are mainly divided into two categories: fixed and adjustable. The fixed restrictor has an unchanged throttling characteristic during operation. Compared with the variable restrictor, its oil film stiffness, stability, and accuracy are lower. The variable restrictor, also known as the feedback restrictor, can adjust the throttling liquid resistance according to the load change. The single-sided film restrictor is one of the most widely used. The single-sided film restrictor can improve the bearing capacity, stiffness, and accuracy of the hydrostatic device. Among them, the single-sided film feedback restrictor with pre-pressure by pressure oil can suppress the film vibration and improve the throttling characteristic, but it cannot be artificially regulated during the working process to obtain different output oil pressures. Summary of the Invention

[0003] The purpose of the present invention is to provide a single-sided film feedback restrictor with actively adjustable pre-pressure and its usage method. Through the linear motion of the micro servo cylinder, it can actively control the deformation amount of the elastic film, realize the stable control of the throttling gap of the single-sided film feedback restrictor, and achieve an ideal throttling ratio.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A single-sided film feedback restrictor with actively adjustable pre-pressure includes an upper restrictor body, a lower restrictor body, and a micro servo cylinder; Between the upper restrictor body and the lower restrictor body, there is an elastic film. The setting of this elastic film forms a pre-pressure chamber between the bottom of the upper restrictor body and the elastic film. In the pre-pressure chamber, the linear push rod of the micro servo cylinder can squeeze the pressure oil in the pre-pressure chamber. Between the top of the lower restrictor body and the elastic film, a throttling chamber is constructed. Moreover, a throttling platform is provided at the top of the lower restrictor body. The throttling chamber is communicated with the lower oil outlet hole through the throttling gap between the throttling platform and the elastic film. Through the movement of the linear push rod of the micro servo cylinder, the pressure of the pressure oil in the pre-pressure chamber can change, causing the elastic film to produce a small deformation and thus changing the throttling characteristic. The lower restrictor body is provided with an oil supply hole, and the oil supply hole is communicated with an annular oil supply groove.

[0005] A further improvement of the present invention is that an annular sealing ring is also provided between the upper restrictor body and the lower restrictor body.

[0006] A further improvement of the present invention is that the throttling table is an annular frustum.

[0007] A further improvement of the present invention is that the lower throttle fluid is provided with an oil supply hole, which communicates with the annular oil supply groove and supplies oil to the throttling cavity through the connecting groove.

[0008] A further improvement of the present invention is that the lower throttle fluid is provided with a pressure sensor.

[0009] A further improvement of the present invention is that there is an opening at the oil outlet of the lower throttle fluid for placing the pressure sensor.

[0010] A further improvement of the present invention is that the downward movement of the linear push rod increases the pressure of the pressure oil in the preloading cavity. The pressure oil acts on the elastic film to cause a downward reverse deformation of the elastic film. By providing power through the electric cylinder servo motor, the linear push rod is controlled to make a small displacement, and the pressure of the pressure oil in the preloading cavity is controlled to control the deformation degree of the elastic film, thereby changing the height of the throttling gap and achieving the purpose of changing the throttling performance.

[0011] A further improvement of the present invention is that the output signal of the pressure sensor is converted into a control signal of the servo motor to achieve precise linear motion control, control the pressure of the pressure oil in the preloading cavity, and control the deformation amount of the elastic film.

[0012] A method for using a single-sided film feedback throttler with actively adjustable pre-pressure includes: In the preloading cavity, the linear push rod of the micro servo electric cylinder extrudes the pressure oil in the preloading cavity. The downward movement of the linear push rod increases the pressure of the pressure oil in the preloading cavity. The pressure oil acts on the elastic film to cause a downward reverse deformation of the elastic film. By providing power through the electric cylinder servo motor, the linear push rod is controlled to make a small displacement, and the pressure of the pressure oil in the preloading cavity is controlled to control the deformation degree of the elastic film, thereby changing the height of the throttling gap and achieving the purpose of changing the throttling performance.

[0013] A further improvement of the present invention further includes: The pressure sensor is in direct contact with the flowing pressure oil, accurately measures the oil pressure of the pressure oil in real time, converts the output signal of the pressure sensor into a control signal of the servo motor, and transmits the signal to the micro servo electric cylinder to adjust the rotation speed of the servo motor, control the displacement of the linear push rod, change the pressure of the pressure oil in the preloading cavity, and control the deformation degree of the elastic film, thereby changing the height of the throttling gap and achieving the purpose of changing the throttling performance.

[0014] Compared with the prior art, the present invention has at least the following beneficial technical effects: A single-sided film feedback throttle with actively adjustable pre-pressure and its usage method provided by the present invention. The servo electric cylinder technology is an actuator that combines a servo motor with a mechanical transmission mechanism such as a lead screw or a rack and pinion. Its core principle is to precisely control the output torque of the servo motor and convert the rotational motion into a linear motion through a mechanical conversion device to achieve high-precision and high-efficiency position control. The present invention designs an actively adjustable film feedback throttle that precisely regulates the film gap using a micro servo electric cylinder, which can not only achieve the function of adjustable pre-pressure but also actively adjust the gap to change the throttling characteristics of the throttle. Compared with a general pre-pressured single-sided film throttle, a micro servo electric cylinder is used to control the pressure of the pressure oil in the pre-pressure chamber, and the micro servo electric cylinder is combined with a pressure sensor at the oil outlet to monitor the oil pressure of the output pressure oil in real time and convert the output signal of the sensor into a control signal for the servo motor to achieve precise linear motion control to control the deformation of the elastic film. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 FIG. is a schematic structural diagram of a single-sided film feedback throttle with actively adjustable pre-pressure according to the present invention; Figure 2 FIG. is a bottom view of the upper throttle body of the throttle according to the present invention; Figure 3 FIG. is a top view of the lower throttle body of the throttle according to the present invention.

[0017] DESCRIPTION OF THE REFERENCE NUMERALS: 1 is the lower throttle body, 2 is the upper throttle body, 3 is the elastic film, 4 is the micro servo electric cylinder, 5 is the annular sealing ring, 6 is the pressure sensor, 1-1 is the oil supply hole, 1-2 is the annular oil supply groove, 1-3 is the throttling chamber, 1-4 is the throttling platform, 1-5 is the oil outlet, 1-6 is the sensor placement hole, 1-7 is the connecting groove, 1-8 is the lower half placement groove of the annular sealing ring, 2-1 is the end of the oil supply hole, 2-2 is the upper half placement groove of the annular sealing ring, 4-1 is the linear push rod, 4-2 is the pre-pressure chamber. SPECIFIC EMBODIMENTS

[0018] In the following text, only some exemplary embodiments are briefly described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the accompanying drawings and the description are to be regarded as illustrative in nature and not restrictive.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0020] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0023] It should be understood that the terms used in the specification of the present invention are merely for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0024] It should also be understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0025] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are merely exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art can additionally design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0026] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0027] Embodiment 1 As Figures 1 to 3 shown, a single-sided film feedback throttle with actively adjustable pre-pressure provided by the present invention includes a lower fluid section 1, an upper fluid section 2, an elastic film 3, a micro servo cylinder 4, an annular sealing ring 5 and a pressure sensor 6. The lower fluid section 1 includes an oil supply hole 1-1, an annular oil supply groove 1-2, a throttling chamber 1-3, a throttling platform 1-4, an oil outlet hole 1-5, a sensor placement hole 1-6, a connection groove 1-7 and a lower half placement groove 1-8 for the annular sealing ring. The micro servo cylinder 4 mainly includes a linear push rod 4-1 and a pre-pressure chamber 4-2. The upper fluid section 2 includes an end of the oil supply hole 2-1 and an upper half placement groove 2-2 for the annular sealing ring.

[0028] The elastic film 3 is installed between the upper fluid section 2 and the lower fluid section 1. The micro servo cylinder 4 is installed on the upper fluid section 2, and an oil supply hole 1-1 is opened on the side of the lower fluid section 1. There is an opening on the wall of the oil outlet hole of the lower fluid section for placing the pressure sensor 6, which can be used to monitor the oil pressure of the output pressure oil in real time and convert the output signal of the pressure sensor into a control signal for the servo motor to achieve precise linear motion control to control the deformation amount of the elastic film 3. A pre-pressure chamber 4-2 is formed between the bottom of the upper fluid section and the elastic film 3. In the pre-pressure chamber 4-2, the linear push rod 4-1 of the micro servo cylinder 4 extrudes the pressure oil in the pre-pressure chamber 4-2. The downward movement of the linear push rod 4-1 increases the pressure of the pressure oil in the pre-pressure chamber 4-2. The pressure oil acts on the elastic film 3 to cause a downward reverse deformation of the elastic film 3. By providing power through the motor of the micro servo cylinder 4, the linear push rod 4-1 is controlled to make a small displacement, and the pressure of the pressure oil in the pre-pressure chamber 4-2 is controlled to control the deformation degree of the elastic film 3, thereby changing the height of the throttle gap and achieving the purpose of changing the throttle performance.

[0029] Among them, the micro servo cylinder is an electric actuator that highly integrates a servo motor and a transmission mechanism, and realizes high-precision linear motion control through electrical signals. Its working principle: The servo driver sends a pulse signal or an analog signal to control the rotation angle and speed of the motor, and then drives the lead screw to rotate to push the push rod to achieve linear motion. The encoder real-time feedbacks the position information to form a closed-loop control to ensure the motion accuracy and stability.

[0030] The elastic film 3 needs to be made of a highly elastic material (such as rubber, silicone or polyurethane) to ensure that the film produces controllable deformation under pressure and returns to its original state after the pressure is released. The flexibility of the material directly affects the sensitivity of pressure transmission and the dynamic response of the system. The elastic film 3 needs to be in long-term contact with the pressure oil, so it must have excellent oil resistance to prevent material swelling, aging or performance degradation. At the same time, it needs to adapt to the chemical environment of the oil fluid to avoid seal failure caused by medium corrosion. The edge of the elastic film 3 needs to be closely attached to the upper and lower fluid sections, and an interference fit or a sealing structure is used to ensure no leakage. The surface of the material should be smooth to reduce the frictional resistance with the fluid and extend the service life. The elastic film 3 needs to withstand periodic pressure changes, so it needs to have sufficient tear resistance and fatigue life to avoid cracks or permanent deformation after long-term use.

[0031] In this embodiment, a throttle chamber 1-3 is constructed between the top of the lower fluid section 1 and the elastic film 3, and a throttle platform 1-4 is also provided on the top of the lower fluid section 1. The throttle chamber 1-3 is communicated with the lower oil outlet hole through the throttle gap between the throttle platform 1-4 and the elastic film 3; the throttle platform 1-4 is an annular truncated cone.

[0032] In this embodiment, an annular sealing ring 5 is also provided between the upper-section fluid 2 and the lower-section fluid 1. Specifically, the annular sealing ring 5 is located in the lower half placing groove 1-8 and the upper half placing groove 2-2 of the annular sealing ring.

[0033] The annular sealing ring 5 is installed between the upper-section fluid 2 and the lower-section fluid 1, located in the lower half placing groove 1-8 and the upper half placing groove 2-2 of the annular sealing ring, forming a reliable sealing barrier to prevent the pressure oil in the pre-pressure chamber 4-2 from leaking to the outside or entering other areas, ensuring the stability of the system pressure. Since there may be slight unevenness or gaps on the machined surfaces of the upper and lower-section fluids, the sealing ring fills these gaps through elastic deformation to ensure the sealing effect and adapt to machining errors. In a pressure-changing or vibrating environment, the sealing ring can absorb part of the impact energy, reduce the direct action on the upper and lower-section fluids, and extend the service life of the equipment. Before installation, ensure that the dimensions of all parts of the sealing ring match correctly, the environment and the sealing ring are clean, and avoid impurities from entering. Apply lubricating grease at the sealing ring to make the installation process easier and prevent burning during the initial operation. Ensure that the installation position and angle of the sealing ring strictly meet the requirements to avoid affecting the sealing effect due to being too tight or too loose. For sealing rings with grooves, springs or letter characters, pay attention to the identification of the front and back sides.

[0034] Embodiment 2 As Figures 1 to 3 shown, a usage method of a single-sided film feedback throttle with actively adjustable pre-pressure provided by the present invention includes: In the pre-pressure chamber 4-2, the linear push rod 4-1 of the micro servo cylinder 4 squeezes the pressure oil in the pre-pressure chamber 4-2. The downward movement of the linear push rod 4-1 increases the pressure of the pressure oil in the pre-pressure chamber 4-2. The pressure oil acts on the elastic film 3 to cause a downward reverse deformation of the elastic film 3. By providing power through the servo motor of the micro servo cylinder 4, the linear push rod 4-1 is controlled to make a small displacement, the pressure of the pressure oil in the pre-pressure chamber 4-2 is controlled, the deformation degree of the elastic film 3 is controlled, and then the height of the throttle gap is changed to achieve the purpose of changing the throttle performance.

[0035] In this embodiment, specifically: the pressure oil sequentially enters the throttle chamber 1-3 through the annular oil supply groove 1-2 and the connecting groove 1-7. Finally, the pressure oil passes through the throttle gap between the throttle platform 1-4 and the elastic film 3 and flows out from the oil outlet hole 1-5. A pressure sensor 6 is placed in the sensor placing hole 1-6 on the hole wall of the oil outlet hole of the lower-section fluid, which is in direct contact with the flowing pressure oil, can accurately measure the oil pressure of the pressure oil in real time, convert the output signal of the pressure sensor into the control signal of the servo motor, and transmit the signal to the micro servo cylinder 4 to regulate the rotation speed of the servo motor, control the displacement of the linear push rod, change the pressure of the pressure oil in the pre-pressure chamber, control the deformation degree of the elastic film, and then change the height of the throttle gap to achieve the purpose of changing the throttle performance.

[0036] The present invention directly places a pressure sensor 6 in the hole wall sensor placement holes 1-6 of the lower-section fluid oil outlet hole, achieving real-time and accurate measurement of the pressure oil pressure. This direct contact measurement method can avoid measurement errors caused by pressure transmission loss or interference, improving the accuracy of pressure control. The output signal of the pressure sensor is converted into a control signal for the servo motor to form a closed-loop control system. This control method can adjust the rotational speed of the servo motor in real time according to the change of the actual pressure oil pressure, thereby accurately controlling the displacement of the linear push rod and realizing the dynamic adjustment of the pressure of the pressure oil in the pre-pressure chamber.

[0037] The present invention can change the throttling clearance height between the throttling table 1-4 and the elastic film 3 by controlling the deformation degree of the elastic film 3. This design makes the throttling performance no longer fixed, but can be dynamically adjusted according to actual needs. Since the throttling clearance height is adjustable, the present invention can adapt to the throttling requirements under different working conditions, improving the flexibility and versatility of the system.

[0038] The present invention can achieve fine adjustment of the pressure of the pressure oil through precise control of the micro servo cylinder 4, thereby precisely controlling the deformation degree of the elastic film and the height of the throttling clearance. This precise control helps to reduce energy waste and improve system efficiency. The fast response characteristics of the servo motor and the micro servo cylinder enable the system to quickly adapt to pressure changes and maintain stable throttling performance.

[0039] The present invention integrates functions such as pressure monitoring, feedback control, and throttling adjustment into a compact structure, reducing system complexity and floor space. The integrated design makes the connection between the components of the system closer, facilitating installation, commissioning, and maintenance. At the same time, due to the adoption of standardized interfaces and components, the maintenance cost and difficulty are also reduced.

[0040] The above shows and describes the basic principles, main features, and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed by the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0041] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A single-sided film feedback throttle with actively adjustable pre-pressure, characterized in that, It includes an upper-section fluid, a lower-section fluid, and a micro servo cylinder. Between the upper-section fluid and the lower-section fluid, there is an elastic film. The setting of this elastic film forms a pre-pressure chamber between the bottom of the upper-section fluid and the elastic film. In the pre-pressure chamber, the linear push rod of the micro servo cylinder can extrude the pressure oil in the pre-pressure chamber. Between the top of the lower-section fluid and the elastic film, a throttling chamber is constructed, and a throttling platform is also provided at the top of the lower-section fluid. The throttling chamber is communicated with the lower oil outlet through the throttling gap between the throttling platform and the elastic film. By the movement of the linear push rod of the micro servo cylinder, the pressure of the pressure oil in the pre-pressure chamber can be changed, causing the elastic film to have a slight deformation and thus changing the throttling characteristics. The lower-section fluid is provided with an oil supply hole, and the oil supply hole is communicated with an annular oil supply groove.

2. The one-sided film feedback throttle with actively adjustable pre-pressure according to claim 1, characterized in that, An annular sealing ring is also provided between the upper-section fluid and the lower-section fluid.

3. The one-sided film feedback throttle with actively adjustable pre-pressure according to claim 1, characterized in that, The throttling platform is an annular frustum.

4. A single-sided film feedback throttle with actively adjustable pre-pressure according to claim 1, characterized in that The lower-section fluid is provided with an oil supply hole, and the oil supply hole is communicated with an annular oil supply groove and supplies oil to the throttling chamber through a connecting groove.

5. The single-sided film feedback throttle with actively adjustable pre-pressure according to claim 4, characterized in that, The lower-section fluid is provided with a pressure sensor.

6. The one-sided film feedback throttle with actively adjustable pre-pressure according to claim 5, characterized in that, There is an opening at the oil outlet of the lower-section fluid for placing the pressure sensor.

7. The one-sided film feedback throttle with actively adjustable pre-pressure according to claim 6, characterized in that The downward push movement of the linear push rod increases the pressure of the pressure oil in the pre-pressure chamber. The pressure oil acts on the elastic film to cause a downward reverse deformation of the elastic film. The power is provided by the servo motor of the cylinder to control the linear push rod to make a small displacement, control the pressure of the pressure oil in the pre-pressure chamber, control the deformation degree of the elastic film, and then change the height of the throttling gap to achieve the purpose of changing the throttling performance.

8. A single-sided film feedback throttle with actively adjustable pre-pressure according to claim 7, characterized in that, The output signal of the pressure sensor is converted into a control signal of the servo motor to achieve precise linear motion control, control the pressure of the pressure oil in the pre-pressure chamber, and control the deformation amount of the elastic film.

9. A method for using a single-sided film feedback throttle with actively adjustable pre-pressure according to any one of claims 1 to 8, characterized in that It includes: In the pre-pressure chamber, the linear push rod of the micro servo cylinder extrudes the pressure oil in the pre-pressure chamber. The downward push movement of the linear push rod increases the pressure of the pressure oil in the pre-pressure chamber. The pressure oil acts on the elastic film to cause a downward reverse deformation of the elastic film. The power is provided by the servo motor of the cylinder to control the linear push rod to make a small displacement, control the pressure of the pressure oil in the pre-pressure chamber, control the deformation degree of the elastic film, and then change the height of the throttling gap to achieve the purpose of changing the throttling performance.

10. The usage method of a single-sided film feedback throttle with actively adjustable pre-pressure according to claim 9, characterized in that, It also includes: The pressure sensor is in direct contact with the flowing pressure oil, accurately measures the oil pressure of the pressure oil in real time, converts the output signal of the pressure sensor into a control signal of the servo motor, transmits the signal to the micro servo cylinder, regulates the rotation speed of the servo motor, controls the displacement amount of the linear push rod, changes the pressure of the pressure oil in the pre-pressure chamber, and controls the deformation degree of the elastic film, and then changes the height of the throttling gap to achieve the purpose of changing the throttling performance.

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