CN217002459U

CN217002459U - Pressure feedback type excitation valve

Info

Publication number: CN217002459U
Application number: CN202121261038.6U
Authority: CN
Inventors: 贾文昂; 倪子帆; 李展尚; 陈统中
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-07-19
Anticipated expiration: 2031-06-07

Abstract

A pressure feedback type shock excitation valve comprises a valve body, a valve sleeve, a valve core, a reversing sleeve and an end cover, wherein five annular sinking grooves are formed in the valve body, a first sinking groove and a fifth sinking groove are communicated with an oil return port T, a second sinking groove and a fourth sinking groove are communicated with a working oil port A, B, a third sinking groove is communicated with an oil inlet P, and an oil return branch is arranged beside the fifth sinking groove and communicated with the oil return port T; the valve sleeve is nested in the inner hole of the valve body, and four groups of T-shaped oil inlet windows are formed in the valve sleeve; the valve core is nested in the inner hole of the valve sleeve, and six shoulders are arranged on the valve core; the second shoulder to the fifth shoulder are working shoulders, and a plurality of rectangular notches corresponding to the oil inlet windows of the valve sleeves are formed in the working shoulders; the reversing sleeve passes through the valve core shaft sleeve and is sleeved on the reversing shoulder of the valve core, and the end cover is nested in the valve sleeve. The utility model well realizes the axial sliding of the valve core, the shock excitation valve has simpler structure, the valve core performs axial displacement, the valve sleeve performs circumferential rotation, the shock excitation valve has stable working performance and large output flow.

Description

Pressure feedback type excitation valve

Technical Field

The utility model relates to the field of hydraulic control, in particular to a pressure feedback type shock excitation valve.

Background

Vibration is one of the most common phenomena in nature and is a fundamental form of the world's movement of matter. The different ways of achieving the excitation can be divided into mechanical, electromagnetic and electrohydraulic. The mechanical vibration exciter has lower vibration frequency and more serious waveform distortion, and is mainly used in the test with lower vibration frequency; the output force of the electromagnetic vibration exciter is low, the waveform distortion is serious, the amplitude ratio is small, the upper limit frequency is not high, and the electromagnetic vibration exciter is only used for testing various small and medium-sized electronic elements and test pieces; the electrohydraulic vibration exciter has the advantages of firm structure, large generated load, high working frequency and easy control, and can be applied to the test of large-scale structures. With the development and progress of social science, an excitation system is widely applied to the engineering technical fields of buildings, spaceflight, automobiles and the like and becomes an indispensable basic device, and the excitation system is an important part for realizing mechanical vibration and can enable an excited object to obtain vibration quantity with a certain form and size, so that the function of equipment is realized. The traditional electrohydraulic vibration mechanism has a complex structure and high cost, and the vibration frequency is limited by the structure and can not meet the vibration requirement in engineering. Patent document CN200710160253.5 discloses an electro-hydraulic shock excitation control valve, but the structure is relatively complex, the working performance is unstable, and the shock excitation flow rate is small.

Disclosure of Invention

In order to overcome the problems, the utility model provides a pressure feedback type excitation valve.

The technical scheme adopted by the utility model is as follows: a pressure feedback type excitation valve comprises a valve body, a valve sleeve, a valve core, a reversing sleeve and an end cover, wherein five annular sinking grooves are formed in the valve body, and are respectively a first sinking groove, a second sinking groove, a third sinking groove, a fourth sinking groove and a fifth sinking groove from right to left; the first sinking groove and the fifth sinking groove are communicated with an oil return port T, the second sinking groove and the fourth sinking groove are communicated with a working oil port A, B, the third sinking groove is communicated with an oil inlet P, and an oil return branch is arranged beside the fifth sinking groove and communicated with the oil return port T;

the valve sleeve is nested in an inner hole of the valve body, four groups of T-shaped oil inlet windows are formed in the valve sleeve, namely a first group of oil inlet windows, a second group of oil inlet windows, a third group of oil inlet windows and a fourth group of oil inlet windows from right to left, each group of oil inlet windows comprises a plurality of T-shaped windows which are uniformly distributed along the circumferential direction, and a rectangular through hole for connecting with an external coupler or a transmission device is formed in the left end of the valve sleeve;

the valve core is nested in the inner hole of the valve sleeve, six shoulders are arranged on the valve core, the six shoulders are respectively a first shoulder, a second shoulder, a third shoulder, a fourth shoulder, a fifth shoulder and a sixth shoulder from left to right, the first shoulder is a reversing shoulder, and a high-pressure oil hole and a low-pressure oil hole are formed in the reversing shoulder; the second shoulder to the fifth shoulder are working shoulders, a plurality of notches corresponding to the oil inlet windows of the valve sleeves are formed in the working shoulders, the notches are uniformly distributed along the circumferential direction, the notches in the adjacent shoulders are staggered with each other, the notches formed in the second shoulder and the fourth shoulder are identical in position, and the notches formed in the third shoulder and the fifth shoulder are identical in position; the sixth shoulder is a supporting shoulder, and a bearing small hole is formed in the supporting shoulder; the distance between each of the six shoulders is the same as the distance between each group of oil inlet windows on the valve sleeve; a shaft on the valve core and between the second shoulder and the third shoulder is provided with an oil inlet small hole, an oil path is arranged in the shaft of the valve core, and the oil path is communicated with a bearing small hole behind the supporting shoulder and a high-pressure oil hole on the reversing shoulder; the low-pressure oil hole on the reversing shoulder is communicated with the oil return port T;

the reversing sleeve is internally provided with a spiral groove, penetrates through the valve core shaft, is sleeved on the reversing shoulder of the valve core and is connected with the valve body bolt, and the reversing sleeve is in sealing fit with the valve body; the end cover is nested in the valve sleeve and is arranged at the right end of the valve core, and the end cover is in sealing fit with the valve sleeve;

a closed first sensitive cavity is formed between the reversing shoulder and the reversing sleeve, and a closed second sensitive cavity is formed between the supporting shoulder and the end cover; the area of the left end face of the reversing shoulder of the valve core is twice that of the right end face of the supporting shoulder, and the area of the second sensitive cavity is half that of the first sensitive cavity.

Furthermore, the number of the rectangular notches on the working shoulder of the valve core is four, six, eight or sixteen, and the number of the oil inlet windows on the valve sleeve is the same as that of the notches on the working shoulder of the valve core.

Furthermore, the shape of the oil inlet window on the valve sleeve is consistent with that of the notch on the working shoulder of the valve core, and the oil inlet window is circular, square, rhombic or triangular.

The technical conception of the utility model is as follows: the valve core of the pressure feedback type excitation valve has two degrees of freedom, axial linear motion and circumferential rotary motion can be realized, and the valve sleeve can realize circumferential rotary motion; the working shoulder of the valve core is provided with notches which are uniformly distributed in the circumferential direction and correspond to the oil inlet window on the valve sleeve in position, and the notches between the adjacent shoulders are staggered mutually. When the valve sleeve rotates, the notches on the adjacent shoulders of the valve core are overlapped with the corresponding oil inlet windows sequentially, so that the flow of the oil inlets and the oil outlets A and B on the valve body is periodically alternated, the flow of the left cavity and the flow of the right cavity of the hydraulic cylinder are periodically changed, the periodic repeated motion of the hydraulic cylinder is realized, and the function of excitation is realized. The excitation period of the repeated movement of the hydraulic cylinder is determined by the rotating speed of the valve sleeve, the amplitude of the excitation is determined by the flow rate entering and exiting the hydraulic cylinder, and the flow rate depends on the overlapping area of the valve core and the valve sleeve, so that the excitation frequency can be adjusted by changing the rotating speed of the valve sleeve, and the excitation amplitude can be adjusted by changing the overlapping area of the rectangular notch of the valve core and the oil inlet window of the valve sleeve.

Axial linear motion of the valve core: high-pressure oil enters a space between a third shoulder and a fourth shoulder of the valve core through an oil inlet of the valve body and an oil inlet window of the valve sleeve, the high-pressure oil can reach a reversing shoulder of the valve core due to small oil inlet holes and an oil path on the valve core shaft, the reversing shoulder is provided with a high-pressure oil hole and a low-pressure oil hole, a sensitive cavity is formed between the reversing shoulder and the reversing sleeve, the reversing sleeve is provided with a spiral groove, the oil can enter the sensitive cavity through the spiral groove after coming out of the high-pressure oil hole, and the oil can also enter the low-pressure oil hole through the spiral groove and is discharged to an oil return port T from the low-pressure oil hole; under the action of external force, the valve core rotates by a certain angle, the overlapping area between the high-low pressure oil hole on the reversing shoulder and the spiral groove on the reversing sleeve is changed, the oil amount entering and exiting the sensitive cavity is changed, the pressure of the sensitive cavity is changed, the balance is broken, axial force is generated to push the valve core to generate axial linear motion, the overlapping area between the high-low pressure oil hole and the spiral groove is gradually changed in the axial linear motion process, the balance is restored again, the axial motion of the valve core is stopped, and at the moment, the area of the rectangular notch on the valve core and the area of the oil inlet window on the valve sleeve are changed, so that the change of the excitation amplitude is realized.

The utility model has the beneficial effects that: the valve core reversing shoulder is provided with the high-low pressure oil holes and the sensitive cavity, so that the axial sliding of the valve core is well realized, the structure of the shock excitation valve is simpler, the valve core is axially displaced, the valve sleeve is circumferentially rotated, the working performance of the shock excitation valve is stable, and the output flow is large.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the valve body of the present invention;

fig. 3 is a schematic structural view of the valve sleeve of the present invention;

FIG. 4 is a schematic structural view of the valve cartridge of the present invention;

FIG. 5 shows the fully closed position of the valve core and valve sleeve of the present invention;

FIG. 6 is a fully open state of the valve core and valve sleeve of the present invention;

fig. 7 a-d are schematic views of different shaped windows of the valve housing of the present invention;

fig. 8 a-d are schematic views of different shapes of notches of the valve core of the present invention.

Description of the reference numerals: 1. a reversing sleeve; 2. a valve body; 3. a valve housing; 4. a valve core; 5. an end cap; 6. a first sensitive chamber; 7. a second sensitive chamber; 8. a first sink tank; 9. a second sink tank; 10. a third sink tank; 11. a fourth sink tank; 12. a fifth sinking groove; 13. a first set of oil intake windows; 14. a second set of oil feed windows; 15. a third set of oil intake windows; 16. a fourth set of oil feed windows; 17. a rectangular through hole; 18. a first shoulder; 19. a second shoulder; 20. a third shoulder; 21. a fourth shoulder; 22. a fifth shoulder; 23. a sixth shoulder; 24. a bearing aperture; 25. oil inlet holes; 26. a high pressure oil hole; 27. a low pressure oil hole; 28. a notch.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to the attached drawings, the pressure feedback type shock excitation valve comprises a valve body 2, a valve sleeve 3, a valve core 4, a reversing sleeve 1 and an end cover 5, wherein five annular sinking grooves are formed in the valve body 2, and from right to left, the five annular sinking grooves are a first sinking groove 8, a second sinking groove 9, a third sinking groove 10, a fourth sinking groove 11 and a fifth sinking groove 12 respectively; the first sinking groove 8 and the fifth sinking groove 12 are communicated with an oil return port T, the second sinking groove 9 and the fourth sinking groove 11 are communicated with a working oil port A, B, the third sinking groove 10 is communicated with an oil inlet P, and an oil return branch is arranged beside the fifth sinking groove 12 and is communicated with the oil return port T;

referring to fig. 3, the valve sleeve 3 is nested in an inner hole of the valve body 2, four groups of T-shaped oil inlet windows are arranged on the valve sleeve 3, from right to left, a first group of oil inlet windows 13, a second group of oil inlet windows 14, a third group of oil inlet windows 15 and a fourth group of oil inlet windows 16 are respectively arranged on the valve sleeve 3, each group of oil inlet windows comprises a plurality of T-shaped windows which are uniformly distributed along the circumferential direction, and a rectangular through hole 17 used for connecting with an external coupler or a transmission device is arranged at the left end of the valve sleeve 3;

referring to fig. 4, the valve core 4 is nested in the inner bore of the valve sleeve 3, six lands are arranged on the valve core 4, the six lands are respectively a first land 18, a second land 19, a third land 20, a fourth land 21, a fifth land 22 and a sixth land 23 from left to right, wherein the first land 18 is a reversing land, and a high-pressure oil hole 26 and a low-pressure oil hole 27 are arranged on the reversing land; the second shoulder 19 to the fifth shoulder 22 are working shoulders, four, six, eight or sixteen rectangular notches 28 corresponding to the oil inlet windows of the valve sleeve 3 are formed in the working shoulders, the number of the rectangular notches 28 can be the same as or can be divided into two equal parts with the number of the oil inlet windows of the valve sleeve 3, the valve sleeve is called a full-opening type, and the valve sleeve is called a partial-opening type when the number of the rectangular notches 28 is different and cannot be divided into two equal parts;

the rectangular notches are uniformly distributed along the circumferential direction, notches on adjacent shoulders are staggered, notches on the second shoulder 19 and the fourth shoulder 21 are arranged at the same position, and notches on the third shoulder 20 and the fifth shoulder 22 are arranged at the same position; the sixth shoulder 23 is a supporting shoulder, and a bearing small hole 24 is formed in the supporting shoulder; the distance between each of the six shoulders is the same as the distance between each group of oil inlet windows on the valve sleeve 3; a shaft on the valve core 4 between the second shoulder 19 and the third shoulder 20 is provided with a small oil inlet hole 25, the shaft of the valve core 4 is internally provided with an oil path, and the oil path is communicated with a small bearing hole 24 behind the supporting shoulder and a high-pressure oil hole 26 on the reversing shoulder; the low-pressure oil hole 27 on the reversing shoulder is communicated with the oil return port T;

a spiral groove is formed in the reversing sleeve 1, the reversing sleeve 1 penetrates through the valve core 4 and is sleeved on a reversing shoulder of the valve core 4 and is connected with the valve body 2 through a bolt, and the reversing sleeve 1 is in sealing fit with the valve body 2; the end cover 5 is nested in the valve sleeve 3 and is arranged at the right end of the valve core 4, and the end cover 5 is in sealing fit with the valve sleeve 3;

a closed first sensitive cavity 6 is formed between the reversing shoulder and the reversing sleeve 1, and a closed second sensitive cavity 7 is formed between the supporting shoulder and the end cover 5; the area of the left end surface of the reversing shoulder of the valve core 4 is twice that of the right end surface of the supporting shoulder, and the area of the second sensitive cavity 7 is half that of the first sensitive cavity 6.

Referring to fig. 7 and 8, the shape of the oil inlet window on the valve sleeve 3 is consistent with the shape of the notch on the working shoulder of the valve core 4, and the oil inlet window can be circular, square, rhombic or triangular, and the like, so that the purpose of good oil inlet can be realized.

And (3) realizing excitation: one end of the valve sleeve 3 is provided with a rectangular through hole 17 which can be connected with the sleeve through a flat key, and the other end of the sleeve is connected with a transmission mechanism and driven by a servo motor or a hydraulic motor to realize the high-speed rotation of the valve sleeve 3. Four working shoulders are arranged on the valve core 4, eight rectangular notches are uniformly distributed on the four working shoulders, notches on adjacent shoulders are staggered with each other, four sets of oil inlet windows are arranged on the valve sleeve 3 corresponding to the working shoulders of the valve core 4, eight T-shaped oil inlet windows are uniformly distributed in the circumferential direction of each set, the oil inlet windows on the valve sleeve 3 are not staggered, the size of the notch on the valve core 4 is smaller than that of the oil inlet window on the valve sleeve 3, the vibration excitation valve is similar to a two-position four-way valve in function, one of the machine positions is that when high-pressure oil enters the valve core 4 from a P port of the valve body 2 and the T-shaped window on the valve sleeve 3, at the moment, the rectangular notches 19 and 28 on the fourth shoulder 21 on the valve core 4 are superposed with the oil inlet windows on the valve sleeve 3 (refer to figure 6) and are in an open state, and the rectangular notches on the third shoulder 20 and the fifth shoulder 22 on the valve core 4 are not superposed with the oil inlet windows on the valve sleeve 3 (the rectangular notches are not superposed with the oil inlet windows on the valve sleeve 3) (the oil inlet windows) Referring to fig. 5), in a closed state, therefore, oil can enter the oil port a through the overlapped notches and enter the rodless cavity of the hydraulic cylinder, and the oil in the rod cavity of the hydraulic cylinder is extruded to enter the oil port B and then discharged from the oil port T, so that the hydraulic cylinder moves towards the rod cavity; the state of the other machine position is just opposite, the rectangular notches on the first shoulder 19 and the fourth shoulder 21 on the valve core 4 are not overlapped with the oil inlet window on the valve sleeve 3 (refer to fig. 5) and are in a closed state, the rectangular notches on the third shoulder 20 and the fifth shoulder 22 on the valve core 4 are overlapped with the oil inlet window on the valve sleeve 3 (refer to fig. 6) and are in an open state, so that oil can enter the oil port B through the overlapping windows and is led into the rod cavity of the hydraulic cylinder, the oil in the rodless cavity of the hydraulic cylinder is extruded to enter the oil port a and is discharged from the oil port T, and the hydraulic cylinder moves towards the direction of the rodless cavity; the valve sleeve 3 rotates at a high speed, and the excitation valves are periodically alternated between two machine positions, so that the hydraulic cylinder generates periodic reciprocating motion to form high-frequency excitation, and when the rotating speed of the valve sleeve 3 is increased, the period is reduced, and the frequency is increased;

change of excitation amplitude: oil can reach between the third shoulder 20 and the fourth shoulder 21 of the valve core 4 through the oil inlet P of the valve body 2 and the oil inlet window of the valve sleeve 3, and then reaches the high-pressure oil hole 26 of the reversing shoulder and the oil hole 24 behind the supporting shoulder through the oil inlet small hole 25 and the oil path on the shaft of the valve core 4, a sealed cavity called a sensitive cavity 6 is formed between the reversing shoulder and the reversing sleeve 1, the supporting shoulder and the end cover 5 form another sensitive cavity 7, and the area of the sensitive cavity 7 at the supporting shoulder is half of the area of the sensitive cavity 6 at the reversing shoulder; when the valve core is in a balanced state, oil enters the sensitive cavity from the high-pressure oil hole 26 through the spiral groove and then is discharged to the oil hole T of the valve body 2 through the low-pressure oil hole 27, the pressure of the left sensitive cavity 6 is half of that of the right sensitive cavity 7, the thrust force applied to the left end and the right end of the valve core 4 is the same, and the valve core is in a balanced state; when the valve core 4 rotates for a certain angle under the action of external force, the balance of the valve core 4 is broken, when the valve core 4 rotates clockwise (towards the direction of the valve core 4) for a certain angle, the overlapping area of the high-pressure oil hole 26 and the spiral groove is increased, the overlapping area of the low-pressure oil hole 27 and the spiral groove is reduced, the pressure of the sensitive cavity 6 is increased, the force borne by the left end of the valve core 4 is increased, the balance is broken, the valve core 4 moves rightwards, in the process of moving rightwards, the overlapping area of the high-pressure oil hole 26 and the spiral groove is reduced, the overlapping area of the low-pressure oil hole 27 and the spiral groove is increased, the pressure of the sensitive cavity 6 is reduced until the overlapping area is the same as the overlapping area before rotation, and the balanced state is reached again; when the valve core 4 rotates anticlockwise (faces the direction of the valve core 4) for a certain angle, the overlapping area of the low-pressure oil hole 27 and the spiral groove is increased, the overlapping area of the high-pressure oil hole 26 and the spiral groove is reduced, the pressure of the sensitive cavity 6 is reduced, the force applied to the left end of the valve core 4 is reduced, the balance is broken, the valve core 4 moves leftwards, in the process of moving leftwards, the overlapping area of the low-pressure oil hole 27 and the spiral groove is reduced, the overlapping area of the high-pressure oil hole 26 and the spiral groove is increased, the pressure of the sensitive cavity 6 is increased until the overlapping area is the same as the overlapping area before the rotation, and the balanced state is reached again; in the process of the left-right movement of the valve core 4, the overlapping area of the rectangular notch on the shoulder of the valve core 4 and the oil inlet window of the valve sleeve 3 is changed, the oil amount of the oil inlet and the oil outlet of the valve body 2 are changed, the oil amount of the oil inlet and the oil outlet of the hydraulic cylinder are also changed, the oil inlet and the oil outlet are changed in one period, the movement amplitude of the hydraulic cylinder is correspondingly changed, and therefore, the amplitude of the shock excitation is changed.

The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the utility model should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the teachings herein.

Claims

1. A pressure feedback type excitation valve is characterized in that: the valve comprises a valve body (2), a valve sleeve (3), a valve core (4), a reversing sleeve (1) and an end cover (5), wherein five annular sinking grooves are formed in the valve body (2), and from right to left, the five annular sinking grooves are respectively a first sinking groove (8), a second sinking groove (9), a third sinking groove (10), a fourth sinking groove (11) and a fifth sinking groove (12); the first sinking groove (8) and the fifth sinking groove (12) are communicated with an oil return port T, the second sinking groove (9) and the fourth sinking groove (11) are communicated with a working oil port A, B, the third sinking groove (10) is communicated with an oil inlet P, and an oil return branch is arranged beside the fifth sinking groove (12) and communicated with the oil return port T;

the valve sleeve (3) is nested in an inner hole of the valve body (2), four groups of T-shaped oil inlet windows are formed in the valve sleeve (3), from right to left, a first group of oil inlet windows (13), a second group of oil inlet windows (14), a third group of oil inlet windows (15) and a fourth group of oil inlet windows (16) are respectively formed in the valve sleeve (3), each group of oil inlet windows comprises a plurality of T-shaped windows which are uniformly distributed along the circumferential direction, and a rectangular through hole (17) used for being connected with an external coupler or a transmission device is formed in the left end of the valve sleeve (3);

the valve core (4) is nested in an inner hole of the valve sleeve (3), six shoulders are arranged on the valve core (4), the six shoulders are respectively a first shoulder (18), a second shoulder (19), a third shoulder (20), a fourth shoulder (21), a fifth shoulder (22) and a sixth shoulder (23) from left to right, the first shoulder (18) is a reversing shoulder, and a high-pressure oil hole (26) and a low-pressure oil hole (27) are formed in the reversing shoulder; the second shoulder (19) to the fifth shoulder (22) are working shoulders, a plurality of notches (28) corresponding to the oil inlet windows of the valve sleeve (3) are formed in the working shoulders, the notches (28) are uniformly distributed along the circumferential direction, the notches (28) in the adjacent shoulders are staggered, the notches (28) formed in the second shoulder (19) and the fourth shoulder (21) are identical in position, and the notches (28) formed in the third shoulder (20) and the fifth shoulder (22) are identical in position; the sixth shoulder (23) is a supporting shoulder, and a bearing small hole (24) is formed in the supporting shoulder; the distance between each of the six shoulders is the same as the distance between each group of oil inlet windows on the valve sleeve (3); a shaft on the valve core (4) and between the second shoulder (19) and the third shoulder (20) is provided with a small oil inlet hole (25), the shaft of the valve core (4) is internally provided with an oil path, and the oil path is communicated with a small bearing hole (24) behind the supporting shoulder and a high-pressure oil hole (26) on the reversing shoulder; the low-pressure oil hole (27) on the reversing shoulder is communicated with the oil return port T;

a spiral groove is formed in the reversing sleeve (1), the reversing sleeve (1) penetrates through the valve core (4) and is sleeved on a reversing shoulder of the valve core (4) and connected with the valve body (2) through a bolt, and the reversing sleeve (1) is in sealing fit with the valve body (2); the end cover (5) is nested in the valve sleeve (3) and is arranged at the right end of the valve core (4), and the end cover (5) is in sealing fit with the valve sleeve (3);

a closed first sensitive cavity (6) is formed between the reversing shoulder and the reversing sleeve (1), and a closed second sensitive cavity (7) is formed between the supporting shoulder and the end cover (5); the area of the left end face of the reversing shoulder of the valve core (4) is twice that of the right end face of the supporting shoulder, and the area of the second sensitive cavity (7) is half that of the first sensitive cavity (6).

2. A pressure feedback shock excitation valve as claimed in claim 1 wherein: the number of the rectangular notches on the working shoulder of the valve core (4) is four, six, eight or sixteen, and the number of the oil inlet windows on the valve sleeve (3) is the same as that of the notches (28) on the working shoulder of the valve core (4).

3. A pressure feedback shock excitation valve as defined in claim 1 wherein: the shape of an oil inlet window on the valve sleeve (3) is consistent with that of a notch (28) on the working shoulder of the valve core (4), and the oil inlet window is circular, square, rhombic or triangular.