Sine reciprocating hydraulic excitation valve

Abstract

The invention discloses a sine reciprocating hydraulic exciting valve, which comprises a valve body, an upper valve sleeve, an upper valve core, a lower valve sleeve and a lower valve core. The valve body is provided with a first inner hole and a second inner hole, and the left and right ends of the valve body are respectively provided with a left end cover and a right end cover. The left end cover, the first inner hole and the right end cover form a flow control cavity, and the left end cover, the second inner hole and the right end cover form an exciting cavity. The flow control cavity is provided with the upper valve sleeve which can slide along the axial direction of the valve body, and the upper valve sleeve is provided with the upper valve core which can rotate along the radial direction of the valve body. The exciting cavity is provided with the lower valve sleeve which can slide along the axial direction of the valve body, and the lower valve sleeve is provided with the lower valve core which can rotate along the radial direction of the valve body. The upper valve core and the lower valve core are provided with two sine reciprocating grooves. The pressure gain of the valve is high, the characteristics are easy to calculate and control, and the anti-pollution performance is good. The axial rotation of the shaft can be converted into the pressure output of the sine signal. When the high-frequency exciting is carried out, the amplitude attenuation degree is low. The overall structure of the exciting valve is simple, the working performance is stable, and the output flow is large.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electro-hydraulic excitation, in particular to a sinusoidal reciprocating hydraulic excitation valve. BACKGROUND

[0002] Vibration is one of the most common phenomena in nature. Various forms of physical phenomena, including sound, light, heat, etc. contain vibration. In many cases, vibration is considered a negative factor. For example, vibration can affect the function of precision instruments and equipment, reduce machining accuracy and smoothness, aggravate the fatigue and wear of components, thereby shortening the service life of machines and structures, and vibration can also cause structural deformation and damage, such as the Tacoma Narrows Bridge suspension cable wind damage event in the United States in 1940. However, vibration also has its positive side. For example, vibration is the basis for the work of communication, broadcasting, television, radar, etc. Since the 1950s, a number of production equipment and processes using vibration have emerged. For example, vibration transmission, vibration screening, vibration grinding, etc. They have improved working conditions and increased labor productivity. It can be expected that with the continuous progress of production practice and scientific research, the use of vibration will also increase day by day.

[0003] Exciter is a device attached to some machines and equipment to generate excitation force, and is an important component for generating mechanical vibration. The exciter can make the sample obtain a certain form and size of vibration, so as to perform vibration and strength test on the object, or to calibrate vibration test instruments and sensors. According to the different excitation types, the exciter is divided into electric, electromagnetic, mechanical and electro-hydraulic types. The exciter can generate unidirectional or multidirectional, simple harmonic or non-simple harmonic excitation force. The electric exciter uses the magnetic force acting on the conductor in the magnetic field to generate movement, which is simple in process and low in cost, but the service life is much lower than that of ordinary motors. The electromagnetic exciter adds the pulsating voltage obtained by half-wave rectification of alternating current to the coil, and uses its electromagnetic force to make the movable iron core vibrate. Although the waveform fidelity is higher, the generated amplitude is smaller, and it is difficult to apply to large-scale excitation test. The mechanical exciter also has small maximum thrust and amplitude, and the waveform is severely distorted at high frequency, which cannot be automatically programmed and loaded with lateral load, and is mainly used in low-frequency vibration experiments. The electro-hydraulic exciter has the advantages of firm structure, high upper limit of maximum thrust, large amplitude change, high vibration frequency, automatic programming, loading of lateral load, and waveform distortion. Therefore, the research on hydraulic exciter is a very important basic research.

[0004] The traditional hydraulic excitation valve has complex structure, high manufacturing cost, strict matching tolerance requirement, and many and large forces acting on the valve core, which requires a large control force. When used as a pre-stage, the dynamic response is low, the output amplitude fluctuates greatly when working at high frequency, and a large amount of energy is consumed. SUMMARY

[0005] In order to overcome the above problems, the present application provides a sine reciprocating hydraulic excitation valve.

[0006] The technical scheme adopted by the present application is: 1. A sine reciprocating hydraulic excitation valve, characterized in that it comprises a valve body (4), an upper valve sleeve (5), an upper valve core (6), a lower valve sleeve (9), a lower valve core (10), a left end cover (1) and a right end cover (8); the valve body (4) has a first inner hole and a second inner hole parallel to each other in the axial direction, and the left and right ends of the valve body (4) are respectively provided with the left end cover (1) and the right end cover (8); the left end cover (1), the first inner hole and the right end cover (8) form a flow control cavity (13), and the left end cover (1), the second inner hole and the right end cover (8) form an excitation cavity (17);

[0007] The top surface of the valve body (4) is provided with an oil inlet P port, the middle part of the valve body (4) is provided with an oil outlet T port (21), and the bottom of the valve body (4) is provided with a working A port and a working B port; the upper wall surface of the flow control cavity (13) is provided with a first oil channel (12) communicating the oil inlet P port with the flow control cavity (13), the middle part of the lower wall surface of the flow control cavity (13) is provided with a second oil channel (14) communicating the flow control cavity (13) with the excitation cavity (17), the lower wall surface of the excitation cavity (17) is provided with a third oil channel (18) communicating the working A port with the excitation cavity (17), and the lower wall surface of the excitation cavity (17) is provided with a fourth oil channel (19) communicating the working B port with the excitation cavity (17); the left lower wall surface of the flow control cavity (13) is provided with a fifth oil channel (15) connected to the left upper wall surface of the excitation cavity (17); and the right lower wall surface of the flow control cavity (13) is provided with a sixth oil channel (16) connected to the right upper wall surface of the excitation cavity (17);

[0008] The flow control cavity (13) is provided with an upper valve sleeve (5) which can slide along the axial direction of the valve body (4); the upper valve sleeve (5) is sequentially provided with a first shoulder and a second shoulder from left to right, and the first shoulder and the second shoulder are respectively located on the left side and the right side of the lower wall surface of the oil inlet P port; the first shoulder right side and the second shoulder left side form an oil inlet groove (22); the upper valve sleeve (5) is provided with an upper valve core (6) which can rotate around the axial direction of the valve body (4); the right end of the upper valve core (6) penetrates to the right side of the right end cover (8); the part of the upper valve core (6) located in the flow control cavity (13) is provided with a sine reciprocating groove (27); the inner wall of the upper valve sleeve (5) is provided with a guide column matched with the sine reciprocating groove (27), and the sine reciprocating groove (27) and the guide column (26) constitute a sine reciprocating mechanism; the upper valve core (6) is provided with a support step at both ends of the sine reciprocating groove (27), and a ball bearing (3) is assembled on the support step; the upper valve core (6) rotates to drive the upper valve sleeve (5) to move left and right, thereby realizing the control of the flow rate, flow and pressure of the hydraulic oil in the oil inlet groove (22) on the oil inlet groove (22) of the oil channel on the upper valve sleeve (5);

[0009] The exciting cavity (17) is internally provided with a lower valve sleeve (9) which can slide axially along the valve body (4), and the lower valve sleeve (9) is sequentially provided with a third shoulder and a fourth shoulder from left to right, and the third shoulder and the fourth shoulder are respectively located above the working A port and the working B port; the A port oil return groove (23) is formed at the left side of the third shoulder, the main oil delivery groove (24) is formed between the third shoulder and the fourth shoulder, and the B port oil return groove (25) is formed at the right side of the third shoulder; the lower valve sleeve (9) is internally provided with a lower valve core (10) which can rotate axially around the valve body (4), and the left end of the lower valve core (10) penetrates to the left side of the left end cover (1); the part of the lower valve core (10) which is located in the exciting cavity (17) is provided with a sinusoidal reciprocating groove (27), and the inner wall of the lower valve sleeve (9) is provided with a guide column (26) which cooperates with the sinusoidal reciprocating groove (27), and the sinusoidal reciprocating groove (27) and the guide column (26) constitute a sinusoidal reciprocating mechanism; the lower valve core (10) is provided with a support step at both ends of the sinusoidal reciprocating groove (27), and the support step is assembled with a ball bearing (3); the lower valve core (9) rotates to drive the valve sleeve (10) to move reciprocally left and right, so as to realize the switching of the oil passage on the lower valve sleeve (9) from the main oil delivery groove (24) to the working A port and the working B port.

[0010] The second oil channel (14) is located in the middle of the lower wall surface of the flow control cavity (13), and the left and right ends of the lower wall surface of the flow control cavity (13) are sequentially provided with a first T-shaped through hole and a second T-shaped through hole which are in communication with the upper wall surface of the exciting cavity (17), the first T-shaped through hole is located at the left side of the third shoulder in the exciting cavity (17), and the second T-shaped through hole is located at the right side of the fourth shoulder in the exciting cavity (17); the first T-shaped through hole and the second T-shaped through hole are in communication with the fifth oil channel (15) and the sixth oil channel (16) which are respectively formed in the valve body (4), and the opening end of the first T-shaped through hole on the outer wall surface of the valve body (4) is sealed by an internal hexagonal bolt, and the opening end of the second T-shaped through hole on the outer wall surface of the valve body (4) is used as a drain T port (21).

[0011] The upper valve core (6) and the lower valve core (10) are both provided with a sinusoidal reciprocating groove (27), each sinusoidal reciprocating groove (27) includes two axially symmetrical sinusoidal grooves, the period and the amplitude of the two sinusoidal grooves on the upper valve core (6) and the lower valve core (10) are the same, and the two sinusoidal grooves are butt-jointed at the two ends of the upper valve core (6) or the lower valve core (10) to form a closed sinusoidal reciprocating groove.

[0012] Further, one end of the lower valve core (10) is connected with a servo motor or a hydraulic motor through a speed change gear box or other connecting device, so as to realize the high-speed rotation of the lower valve core; the sinusoidal reciprocating mechanism composed of the sinusoidal reciprocating groove (27) on the lower valve core (10) and the guide column (26) on the lower valve sleeve (9) is used to realize the cyclic reciprocating horizontal movement of the lower valve sleeve (9).

[0013] Further, the upper valve sleeve (5) moves along the horizontal direction and constitutes a hydraulic amplifier with the flow control cavity (13), which converts the input angular displacement signal into the horizontal movement of the upper valve core through the electro-mechanical conversion device, and changes the overlap area of the upper valve core (6) and the second oil passage (14) by inputting different angular signals, so as to adjust the high-pressure hydraulic oil entering the excitation cavity (17).

[0014] The principle of the present application is that the valve core surface of the sinusoidal reciprocating hydraulic excitation valve has a sinusoidal reciprocating groove, and the valve sleeve can realize horizontal reciprocating movement by the axial rotation movement of the valve core. The valve sleeve surface has a hydraulic oil passage corresponding to the oil inlet and outlet window on the valve body. When the upper valve core rotates axially, the upper valve sleeve moves horizontally along the flow control cavity, and the first shoulder on the upper valve sleeve overlaps the oil inlet passage corresponding thereto when it is at the rightmost side, so that the flow of the first oil passage on the valve body changes from the peak flow to the minimum steady flow, realizing the flow control function. When the lower valve core rotates axially, the lower valve sleeve moves horizontally along the excitation cavity, and the hydraulic oil passage on the lower valve sleeve overlaps the oil inlet passage and the oil outlet window corresponding thereto in turn, so that the flow of the oil inlet port P and the oil outlet ports A and B on the valve body changes periodically, resulting in the periodic change of the flow of the left and right cavities of the hydraulic cylinder, thereby realizing the periodic reciprocating movement of the hydraulic cylinder and realizing the excitation function. The excitation frequency of the reciprocating movement of the hydraulic cylinder is determined by the speed of the reciprocating movement of the lower valve sleeve, and the excitation amplitude is determined by the flow size of the hydraulic cylinder, and the flow size depends on the overlap area of the main oil passage of the valve sleeve and the A port and B port of the valve body and the overlap time. Therefore, changing the rotation speed of the lower valve sleeve can change the horizontal movement speed of the lower valve sleeve, thereby adjusting the excitation frequency, and changing the amplitude and period of the sinusoidal function in the sinusoidal reciprocating mechanism on the valve core can adjust the amplitude and frequency of the vibration.

[0015] The movement of the upper valve core: the upper valve core and the flow control cavity constitute a hydraulic amplifier, which converts the rotation speed of the input shaft into the horizontal movement of the upper valve sleeve through a mechanical device, so as to adjust the high-pressure hydraulic oil entering the second oil passage, and the adjusted high-pressure hydraulic oil enters the excitation cavity. The upper valve core is connected with the servo motor through a variable speed gear box and other connecting devices, and the rotation of the upper valve core is controlled by controlling the pulse frequency and quantity received by the servo driver, so as to realize flow control.

[0016] The movement of the lower valve core: the lower valve core and the exciting cavity form an exciting system, the rotation speed of the input shaft is converted into the axial reciprocating movement of the lower valve sleeve through a mechanical device, so that the high-pressure hydraulic oil of the second oil passage is adjusted, and the adjusted high-pressure hydraulic oil enters the exciting cavity. The lower valve core is connected with the servo motor through a variable speed gear box and other connecting devices, and the rotation period of the lower valve core is controlled by controlling the pulse frequency and quantity received by the servo driver. The rotation of the lower valve core drives the horizontal movement of the lower valve sleeve, the hydraulic oil enters one side of the hydraulic cylinder piston through the main input channel on the lower valve sleeve through A port, so that the hydraulic cylinder piston moves horizontally, and the excess hydraulic oil returns to the oil tank through the return oil passage from T port through B port; a certain frequency and quantity of pulses are input to the servo driver, so that the rotation time of the lower valve core passes through half of the movement period, the oil passage is switched, the hydraulic oil enters the other side of the hydraulic cylinder through B port, so that the hydraulic cylinder moves horizontally in the opposite direction, and the excess hydraulic oil returns to the oil tank through the return oil passage on the lower valve sleeve through T port. Since there is a sine reciprocating mechanism between the lower valve core and the lower valve sleeve, when the lower valve core rotates continuously, the lower valve sleeve moves horizontally in a cycle, the oil inlet port is switched between A and B ports, the hydraulic cylinder produces an exciting effect, the amplitude of the exciting effect depends on the joint action of the upper valve core and the lower valve core, and the frequency of the exciting effect depends on the rotation speed of the lower valve core. The exciting characteristics of the exciting valve can be adjusted by changing the movement of the lower valve core.

[0017] The beneficial effects of the present application are: the exciting valve has the advantages of high pressure gain, easy calculation and control of characteristics, and good anti-pollution performance. The axial rotation of the shaft can be converted into the pressure output of the sine signal. When high-frequency exciting is performed, the amplitude attenuation degree is low. The overall structure of the exciting valve is simple, the working performance is stable, and the output flow is large. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the present application;

[0019] Figure 2a is a structural schematic diagram of the valve body of the present application;

[0020] Figure 2b is Figure 2a is a sectional view of A-A in figure 1;

[0021] Figure 3 is a structural schematic diagram of the upper valve sleeve of the present application;

[0022] Figure 4 is a structural schematic diagram of the upper valve core of the present application;

[0023] Figure 5 is a structural schematic diagram of the lower valve sleeve of the present application;

[0024] Figure 6 is a structural schematic diagram of the lower valve core of the present application;

[0025] Figure 7 is the state of the upper valve sleeve of the present application in the closed zero flow condition;

[0026] Figure 8 is the state of the lower valve sleeve of the present application in the A port working condition;

[0027] Figure 9 is the state of the lower valve sleeve of the present application in the B port working condition;

[0028] Figure 10a is the schematic diagram of the sinusoidal reciprocating groove of the upper valve core of the present application;

[0029] Figure 11a is the schematic diagram of the sinusoidal reciprocating groove of the lower valve core of the present application;

[0030] Figure 12a is the schematic diagram of the sinusoidal reciprocating groove of the lower valve core of the present application in the double frequency and double amplitude.

[0031] Explanation of reference signs: 1, left end cover; 2, left gasket; 3, ball bearing; 4, valve body; 5, upper valve sleeve; 6, upper valve core; 7, right gasket; 8, right end cover; 9, lower valve sleeve; 10, lower valve core; 11, circlip; 12, first oil passage; 13, flow control cavity; 14, second oil passage; 15, fifth oil passage; 16, sixth oil passage; 17, excitation cavity; 18, third oil passage; 19, fourth oil passage; 20, transmission oil passage; 21, oil discharge T port; 22, oil inlet groove; 23, A port oil return groove; 24, main oil delivery groove; 25, B port oil return groove; 26, guide column; 27, sinusoidal reciprocating groove. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" appear only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present application, it should be noted that unless otherwise expressly specified and limited, terms such as "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] With reference to the drawings, the sine reciprocating hydraulic excitation valve comprises a valve body 4, an upper valve sleeve 5, an upper valve core 6, a lower valve sleeve 9, a lower valve core 10, a left end cover 1 and a right end cover 8; the valve body 4 is provided with a first inner hole and a second inner hole parallel to each other, and the left and right ends of the valve body 3 are respectively provided with the left end cover 1 and the right end cover 8; the left end cover 1, the first inner hole and the right end cover 8 form a flow control cavity 13, and the left end cover 1, the second inner hole and the right end cover 8 form an excitation cavity 17;

[0036] The top surface of the valve body 4 is provided with a first oil channel 12, the middle part of the valve body 4 is provided with an oil discharge T port 21, and the bottom of the valve body 4 is provided with a third oil channel 18 and a fourth oil channel 19; the upper wall surface of the flow control cavity 13 is provided with the first oil channel 12 communicating with the oil inlet P port and the flow control cavity 13, the middle part of the lower wall surface of the flow control cavity 13 is provided with the second oil channel 14 communicating the flow control cavity 13 with the excitation cavity 17, the lower wall surface of the excitation cavity 17 is provided with the third oil channel 18 communicating the working A port with the excitation cavity 17, and the lower wall surface of the excitation cavity 17 is provided with the fourth oil channel 19 communicating the working B port with the excitation cavity 17; the left lower wall surface of the flow control cavity 13 is provided with the fifth oil channel 15 connected with the left upper wall surface of the excitation cavity 17; and the right lower wall surface of the flow control cavity 13 is provided with the sixth oil channel 16 connected with the right upper wall surface of the excitation cavity 17;

[0037] The flow control cavity 13 is provided with the upper valve sleeve 5 which can slide along the axis of the valve body 4; the upper valve sleeve 5 is provided with a first shoulder and a second shoulder from left to right; the first shoulder and the second shoulder are respectively located on the left side and the right side of the lower wall surface of the oil inlet P port; the first shoulder right side and the second shoulder left side form an oil inlet groove 22; the upper valve sleeve 5 is provided with the upper valve core 6 which can rotate around the axis of the valve body 4; the right end of the upper valve core 6 penetrates to the right side of the right end cover 8; the part of the upper valve core 6 located in the flow control cavity 13 is provided with a sine reciprocating groove 27; the inner wall of the upper valve sleeve 5 is provided with a guide column matched with the sine reciprocating groove 27; the sine reciprocating groove 27 and the guide column 26 constitute a sine reciprocating mechanism; the both ends of the sine reciprocating groove 27 are provided with support steps on the upper valve core 6; the support steps are assembled with ball bearings 3; the upper valve core 6 rotates to drive the upper valve sleeve 5 to move left and right, so as to control the flow rate, flow and pressure of the hydraulic oil in the oil inlet groove on the oil channel of the upper valve sleeve;

[0038] The exciting cavity 17 is internally provided with a lower valve sleeve 9 which can slide axially along the valve body 4, and the lower valve sleeve 9 is sequentially provided with a third shoulder and a fourth shoulder from left to right, and the third shoulder and the fourth shoulder are respectively located above the working A port and the working B port; the A port oil return groove 23 is formed at the left side of the third shoulder, the main oil delivery groove 24 is formed between the third shoulder and the fourth shoulder, and the B port oil return groove 25 is formed at the right side of the third shoulder; the lower valve sleeve 9 is internally provided with a lower valve core 10 which can rotate axially around the valve body 4, and the left end of the lower valve core 10 penetrates to the left side of the left end cover 1; the part of the lower valve core 10 which is located in the exciting cavity 17 is provided with a sinusoidal reciprocating groove 27, and the inner wall of the lower valve sleeve 9 is provided with a guide column 26 which cooperates with the sinusoidal reciprocating groove 27, and the sinusoidal reciprocating groove 27 and the guide column 26 constitute a sinusoidal reciprocating mechanism; the lower valve core 10 is provided with a support step at both ends of the sinusoidal reciprocating groove 27, and the support step is assembled with a ball bearing 3; the lower valve core 9 rotates to drive the lower valve sleeve 10 to move reciprocally left and right, so as to switch the oil passage on the lower valve sleeve 9 from the main oil delivery groove 24 to the working A port and the working B port.

[0039] The second oil channel 14 is located in the middle of the lower wall surface of the flow control cavity 13, and the left and right ends of the lower wall surface of the flow control cavity 13 are sequentially provided with a first T-shaped through hole and a second T-shaped through hole which are in communication with the upper wall surface of the exciting cavity 17, the first T-shaped through hole is located at the left side of the third shoulder in the exciting cavity 17, and the second T-shaped through hole is located at the right side of the fourth shoulder in the exciting cavity 17; the first T-shaped through hole and the second T-shaped through hole are in communication with the fifth oil channel 15 and the sixth oil channel 16 which are respectively formed in the valve body 4, and the opening end of the first T-shaped through hole on the outer wall surface of the valve body 4 is sealed by using an internal hexagonal bolt, and the opening end of the second T-shaped through hole on the outer wall surface of the valve body 4 serves as an oil discharge T port 21.

[0040] Reference is made to the accompanying drawings Figure 10a The sinusoidal reciprocating groove 27 on the upper valve core 6 includes two identical parallel sinusoidal grooves, and the amplitudes and frequencies of the two sinusoidal grooves are the same, and the upper valve core 6 can change the amplitudes and frequencies of the sinusoidal curve, so as to improve the moving speed and distance of the upper valve sleeve 5, thereby controlling the hydraulic flow and pressure of the hydraulic exciting valve.

[0041] Reference is made to the accompanying drawings Figure 11a The sinusoidal reciprocating groove 27 on the lower valve core 10 is composed of two pairs of identical parallel sinusoidal grooves, and the amplitudes and frequencies of the two pairs of sinusoidal grooves are the same, and the lower valve core 10 can change the amplitudes and frequencies of the sinusoidal curve, so as to improve the moving speed and distance of the lower valve sleeve 9, thereby controlling the output hydraulic flow and pressure of the hydraulic exciting valve; and outputting the hydraulic flow which changes in a sinusoidal curve.

[0042] Vibration Implementation: One end of the lower valve core 10 can be connected to a servo motor or hydraulic motor via a gearbox or other connecting device to achieve high-speed rotation of the lower valve core. A sinusoidal reciprocating mechanism, consisting of the sinusoidal reciprocating groove 27 on the lower valve core 10 and the guide post 26 on the lower valve sleeve 9, enables the cyclic reciprocating horizontal movement of the lower valve sleeve 9. The lower valve sleeve 9 has three oil guide grooves on its exterior: from left to right, they are the A-port return groove 23, the main oil delivery groove 24, and the B-port return groove 25. When the main oil delivery groove 24 coincides with the third oil passage (A-port) 18, and the B-port return groove 25 coincides with the fourth oil passage (B-port) 19, and when the main oil delivery groove 24 coincides with the fourth oil passage (B-port) 19, and the A-port return groove 23 coincides with the third oil passage (A-port) 18, the hydraulic vibration valve approximates a two-position three-way valve. One type of machine position involves high-pressure hydraulic oil entering the flow control chamber 13 through the first oil passage (P port) 12 via the inlet P port. Through the combined action of the upper valve core 6 and the second oil passage 14, high-pressure hydraulic oil with a defined pressure and flow rate is output and enters the main oil delivery groove 24 on the lower valve sleeve 9 within the excitation chamber 17. The lower valve sleeve 9, under the action of a sinusoidal reciprocating mechanism, moves to the left until it overlaps with the third oil passage (A port) 18. Figure 8 The oil enters one end of the hydraulic cylinder piston through the third oil passage (port A) 18. The oil at the other end of the hydraulic cylinder piston is squeezed into the fourth oil passage (port B) 19, and then enters the discharge port (port T) 21 through the return oil groove 25 at port B and the fourth oil passage (port B) 19, causing the hydraulic cylinder piston to move in a specific direction. The state of the other machine position is exactly the opposite; the lower valve sleeve 9, under the action of the sinusoidal reciprocating mechanism, moves to the right until it coincides with the fourth oil passage (port B) 19 in the main oil delivery groove 24. Figure 9 Hydraulic oil enters one end of the hydraulic cylinder piston through the fourth oil passage (B port) 19. The oil at the other end of the hydraulic cylinder piston is squeezed into the third oil passage (A port) 18, returns through the A port oil groove 23, and is discharged from the drain port (T port) 21. The hydraulic cylinder piston moves in the opposite direction. The valve sleeve moves horizontally in a reciprocating motion, and the excitation valve alternates periodically between two positions. Therefore, the hydraulic cylinder generates a periodic reciprocating motion, forming a high-frequency excitation. At the same time, since the valve core adopts a sinusoidal reciprocating groove, the stable axial rotation can be converted into a horizontal reciprocating motion with sinusoidal characteristics. When the rotational speed of the lower valve core is increased, the cycle period is shortened and the excitation frequency is increased.

[0043] Changes in excitation frequency: See attached document Figure 12a The vibration valve can change the frequency and period of the sinusoidal reciprocating groove on the lower valve core 10. Under the same axial rotation speed of the lower valve core 10, the period of the cyclic reciprocating horizontal motion of the lower valve sleeve 9 will be shortened to half of the original lower valve core, and the frequency will be increased to twice that of the original lower valve core. By changing the sinusoidal curve of the sinusoidal groove on the lower valve core, the vibration frequency of the hydraulic vibration valve can be controlled.

[0044] Changes in excitation amplitude: See attached documentFigure 12b The excitation valve can change the frequency and period of the sinusoidal reciprocating groove on the lower valve core 10, and can change the periodic reciprocating horizontal movement of the lower valve sleeve 9 at the same axial speed of the lower valve core 10. The period remains unchanged, and the stroke is extended to twice the original lower valve core. By changing the sinusoidal curve of the sinusoidal groove on the lower valve core, the excitation amplitude of the hydraulic excitation valve can be controlled.

[0045] Change of excitation amplitude: The excitation valve changes the size of the overlap area between the oil delivery groove 22 and the second oil channel 14 by changing the rotation input of the upper valve core 6, thereby changing the overall excitation amplitude. The upper valve sleeve 5 moves in the horizontal direction and forms a hydraulic amplifier with the flow control cavity 13. The hydraulic amplifier converts the input angular displacement signal into horizontal movement of the upper valve core through an electrical-mechanical conversion device. By inputting different angular signals, the overlap area between the upper valve core 6 and the second oil channel 14 is changed, and the high-pressure hydraulic oil entering the excitation cavity 17 is adjusted. When the lower valve sleeve 9 moves horizontally, the unit time flow of the main oil delivery channel 24 to the third oil channel (A port) 18 or the fourth oil channel (B port) 19 changes, which is mapped to the hydraulic cylinder to change the movement stroke of the hydraulic cylinder piston, and the excitation amplitude also changes.

[0046] Strengthening of excitation stability: The excitation valve changes the number of sinusoidal reciprocating grooves on the lower valve core 10, and changes the number of guide columns 26 on the lower valve sleeve 9, which can change the stability of the lower valve sleeve 9 at the same axial speed of the lower valve core 10.

[0047] The content described in the embodiments of the present specification is only a list of implementation forms of the inventive concept, and the protection scope of the present application should not be considered to be limited to the specific forms described in the embodiments, and the protection scope of the present application also includes equivalent technical means that can be thought of by those skilled in the art according to the inventive concept.

Claims

1. A sinusoidal reciprocating hydraulic force valve, characterized by: It includes valve body (4), upper valve sleeve (5), upper valve core (6), lower valve sleeve (9), lower valve core (10), left end cover (1) and right end cover (8); the first inner hole and the second inner hole parallel to each top and bottom are opened in the axial direction of valve body (4), and the left and right ends of valve body (4) are respectively provided with left end cover (1) and right end cover (8); the flow control cavity (13) is formed between left end cover (1), first inner hole and right end cover (8), and the vibration excitation cavity (17) is formed between left end cover (1), second inner hole and right end cover (8); The top surface of valve body (4) is provided with oil inlet P, the middle part of valve body (4) is provided with oil outlet T (21), and the bottom of valve body (4) is provided with working A and working B; the upper wall surface of flow control cavity (13) is provided with first oil channel (12) connected with oil inlet P and flow control cavity (13), the middle part of lower wall surface of flow control cavity (13) is provided with second oil channel (14) connected with flow control cavity (13) and vibration excitation cavity (17), the lower wall surface of vibration excitation cavity (17) is provided with third oil channel (18) connected with working A and vibration excitation cavity (17), and the lower wall surface of vibration excitation cavity (17) is provided with fourth oil channel (19) connected with working B and vibration excitation cavity (17); the left lower wall surface of flow control cavity (13) is provided with fifth oil channel (15) connected with the left upper wall surface of vibration excitation cavity (17); the right lower wall surface of flow control cavity (13) is provided with sixth oil channel (16) connected with the right upper wall surface of vibration excitation cavity (17); The upper valve sleeve (5) slidably arranged in the axial direction of valve body (4) is arranged in flow control cavity (13); first shoulder and second shoulder are sequentially arranged on the upper valve sleeve (5) from left to right, and first shoulder and second shoulder are respectively arranged on the left side and the right side of the lower wall surface of oil inlet P; the oil inlet groove (22) is formed between the right side of first shoulder and the left side of second shoulder; the upper valve core (6) rotatably arranged in the axial direction of valve body (4) is arranged in the upper valve sleeve (5); the right end of upper valve core (6) penetrates to the right side of right end cover (8); the part of upper valve core (6) in flow control cavity (13) is provided with sinusoidal reciprocating groove (27); the guide column matched with sinusoidal reciprocating groove (27) is arranged on the inner wall of upper valve sleeve (5), and sinusoidal reciprocating groove (27) and guide column (26) constitute sinusoidal reciprocating mechanism; the support step is arranged on both ends of sinusoidal reciprocating groove (27) of upper valve core (6), and ball bearing (3) is assembled on the support step; the left and right reciprocating movement of upper valve sleeve (5) is driven by the rotation of upper valve core (6), so as to control the flow rate, flow and pressure of hydraulic oil in oil inlet groove (22) on the oil passage of upper valve sleeve (5). The exciting cavity (17) is internally provided with a lower valve sleeve (9) which can slide along the valve body (4) in the axial direction, the lower valve sleeve (9) is sequentially provided with a third shoulder and a fourth shoulder from left to right, the third shoulder and the fourth shoulder are respectively located above the working A port and the working B port; the A port oil return groove (23) is formed at the left side of the third shoulder, the main oil delivery groove (24) is formed between the third shoulder and the fourth shoulder, and the B port oil return groove (25) is formed at the right side of the third shoulder; the lower valve sleeve (9) is internally provided with a lower valve core (10) which can rotate in the axial direction around the valve body (4), the left end of the lower valve core (10) penetrates to the left side of the left end cover (1); the part of the lower valve core (10) which is located in the exciting cavity (17) is provided with a sinusoidal reciprocating groove (27), the inner wall of the lower valve sleeve (9) is provided with a guide column (26) which cooperates with the sinusoidal reciprocating groove (27), and the sinusoidal reciprocating groove (27) and the guide column (26) constitute a sinusoidal reciprocating mechanism; the two ends of the sinusoidal reciprocating groove (27) on the lower valve core (10) are provided with support steps, and the ball bearings (3) are assembled on the support steps; the lower valve core (10) drives the lower valve sleeve (9) to move reciprocally left and right, so that the oil passage on the lower valve sleeve (9) is switched from the main oil delivery groove (24) to the working A port and the working B port. The second oil channel (14) is located in the middle of the lower wall of the flow control cavity (13), the left and right ends of the lower wall of the flow control cavity (13) are sequentially provided with a first T-shaped through hole and a second T-shaped through hole which are in communication with the upper wall of the exciting cavity (17), the first T-shaped through hole is located at the left side of the third shoulder in the exciting cavity (17), and the second T-shaped through hole is located at the right side of the fourth shoulder in the exciting cavity (17); the first T-shaped through hole and the second T-shaped through hole are in communication with the fifth oil channel (15) and the sixth oil channel (16) which are formed in the valve body (4), the opening end of the first T-shaped through hole on the outer wall of the valve body (4) is sealed by using an internal hexagonal bolt, and the opening end of the second T-shaped through hole on the outer wall of the valve body (4) is used as the oil discharge T port (21). The upper valve core (6) and the lower valve core (10) are both provided with the sinusoidal reciprocating groove (27), each sinusoidal reciprocating groove (27) comprises two axially symmetrical sinusoidal grooves, the period and the amplitude of the two sinusoidal grooves on the upper valve core (6) and the lower valve core (10) are the same, and the two sinusoidal grooves are connected end to end at the two ends of the upper valve core (6) or the lower valve core (10) to form a closed sinusoidal reciprocating groove.

2. The sinusoidal, reciprocating, hydraulic, force valve of claim 1 wherein: One end of the lower valve core (10) is connected with a servo motor or a hydraulic motor through a variable speed gear box connection device, so as to realize the high-speed rotation of the lower valve core; the sinusoidal reciprocating mechanism composed of the sinusoidal reciprocating groove (27) on the lower valve core (10) and the guide column (26) on the lower valve sleeve (9) is used to realize the cyclic reciprocating horizontal movement of the lower valve sleeve (9).

3. The sinusoidal, reciprocating, hydraulic, force amplifying, valve of claim 1 wherein: The upper valve sleeve (5) moves in the horizontal direction and constitutes a hydraulic amplifier with the flow control cavity (13), the hydraulic amplifier converts the input angular displacement signal into the horizontal movement of the upper valve core through an electrical-mechanical conversion device, and the overlapping area of the upper valve core (6) and the second oil channel (14) is changed by inputting different angular signals, so as to adjust the high-pressure hydraulic oil entering the exciting cavity (17).

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