A two-way hydraulically controlled two-position four-way reversing solenoid valve and its working method

Abstract

The present invention discloses a two-way hydraulically controlled, two-position, four-way reversing solenoid valve and its operating method. The two-position, four-way reversing solenoid valve includes a main valve sleeve, which is sequentially provided with an oil return hole T, a working hole A, a pressure inlet hole P, a working hole B, and an oil return hole T'. The oil return hole T and the oil return hole T' are connected by a dark flow channel provided in the main valve sleeve. A main valve core is provided in the main valve sleeve, one end of the main valve core is elastically connected to one end cover of the main valve sleeve by a main spring, and the other end contacts the opposite main valve sleeve end cover. A sensitive chamber 1 is provided between the main valve core and the main valve sleeve end cover in contact with it, and a sensitive chamber 2 is provided between the main valve core and the main valve sleeve end cover elastically connected thereto. A pilot valve group is provided on the main valve sleeve, and the pilot valve group controls the switching of high and low pressure inputs to sensitive chambers 1 and 2 through a driving mechanism. The main valve core of the present invention moves left and right within the main valve sleeve under the action of the pressure difference between sensitive chambers 1 and 2, thereby ensuring the reliability and stability of the main valve core's reversing direction.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and in particular to a two-way hydraulically controlled two-position four-way reversing solenoid valve and a working method thereof. Background Art

[0002] In traditional hydraulic systems, a two-position, four-way directional control valve typically uses a two-position, three-way pilot valve to control the hydraulic pressure on one end of the main spool, ensuring its movement within the main valve body. This is also achieved by a return spring within the main valve body, which resets the spool. However, the main spool can become stuck due to hydraulic clamping force or contamination from excess oil, potentially causing the directional control to fail. Summary of the Invention

[0003] To address the shortcomings of the aforementioned background technology, the present invention proposes a two-way, hydraulically controlled, two-position, four-way reversing solenoid valve and its operating method. A single electromagnet simultaneously drives two pilot valve components. When the electromagnet is energized, the pressure in the sensitive cavities on either side of the main valve switches from high pressure to low pressure. When the electromagnet is de-energized, the pressure in the sensitive cavities on either side of the main valve switches. The pressure differential across the main valve core drives the main valve core to move left and right within the main valve body, ensuring reliable and stable switching.

[0004] The technical solution of the present invention is achieved as follows:

[0005] A two-way hydraulically controlled, two-position, four-way reversing solenoid valve comprises a main valve sleeve, on which an oil return hole T, a working hole A, a pressure inlet hole P, a working hole B and an oil return hole T' are sequentially provided along the axial direction thereof. The oil return hole T and the oil return hole T' are connected via a dark flow channel provided in the main valve sleeve. A main valve core is provided in the main valve sleeve, one end of the main valve core is elastically connected to one side end cover of the main valve sleeve via a main spring, and the other end contacts the opposite main valve sleeve end cover. A sensitive chamber 1 is provided between the main valve core and the main valve sleeve end cover in contact therewith, and a sensitive chamber 2 is provided between the main valve core and the main valve sleeve end cover elastically connected thereto. A pilot valve group is provided on the main valve sleeve, and the pilot valve group controls the switching of high and low pressure inputs to the sensitive chamber 1 and the sensitive chamber 2 through a driving mechanism.

[0006] Furthermore, the inner hole of the main valve sleeve is provided with an oil return ring groove 1, a working ring groove 1, a pressure ring groove, a working ring groove 2 and an oil return ring groove 2, which are sequentially distributed along the length direction of the main valve sleeve. The oil return hole T and the oil return hole T' are respectively communicated with the oil return ring groove 1 and the oil return ring groove 2, the pressure inlet hole P is communicated with the pressure ring groove, and the working hole A and the working hole B are respectively communicated with the working ring groove 1 and the working ring groove 2;

[0007] The main valve core is provided with a guide ring groove 1 and a guide ring groove 2 for controlling the high and low pressure output of the working hole A and the working hole B. The guide ring groove 1 and the guide ring groove 2 are sequentially arranged between the sensitive cavity 1 and the sensitive cavity 2 along the axial direction of the main valve core.

[0008] Furthermore, the pilot valve group includes a normally closed pilot valve and a normally open pilot valve, which are respectively close to the two ends of the main valve sleeve on the main valve sleeve. The normally closed pilot valve is provided with a pressure inlet hole P1, a working hole A1 and an oil return hole T1, and the normally open pilot valve is provided with a pressure inlet hole P2, a working hole A2 and an oil return hole T2. The oil return hole T1 and the oil return hole T2 are both connected to the external low-pressure oil return end, and the pressure inlet hole P1 and the pressure inlet hole P2 are both connected to the external high-pressure oil supply end. The main valve sleeve is provided with a secret passage 1 for connecting the working hole A1 and the sensitive chamber 1 and a secret passage 2 for connecting the working hole A2 and the sensitive chamber 2.

[0009] Furthermore, the normally closed pilot valve and the normally open pilot valve both include a pilot valve sleeve, a pilot valve core, a pilot valve spring seat and a return spring, the inner cavity of the pilot valve sleeve is configured as an active cavity and a movable cavity that are in communication, the pilot valve core is disposed in the inner cavity of the pilot valve sleeve, the pilot valve core includes an end rod, a pilot valve ring and a pilot valve rod, the pilot valve ring is disposed in the active cavity, the pilot valve rod is adapted to the movable cavity, the pilot valve rod is disposed in the movable cavity and extends into the pilot valve ring and is connected to the pilot valve ring, the end rod is disposed on a side of the pilot valve ring away from the movable cavity, and one end of the end rod away from the pilot valve ring extends out of the active cavity and is connected to the driving mechanism;

[0010] The pilot valve spring seat is a spring seat with an inner groove. The pilot valve spring seat is arranged in the active cavity and is located in the pilot valve ring. The pilot valve stem is a valve stem with a hollow groove. One end of the hollow groove on the pilot valve stem is inserted into the inner groove of the pilot valve spring seat and slides with the pilot valve spring seat. The reset spring is arranged between the pilot valve spring seat and the inner ring surface of the pilot valve ring away from the end rod.

[0011] Furthermore, the normally closed pilot valve and the normally open pilot valve also include a shaft drive assembly that facilitates the axial movement of the pilot valve core in the pilot valve sleeve, the space between the pilot valve rod and the inner groove of the pilot valve spring seat is set as a pilot valve high-pressure chamber, the space between the cavity wall of the movable cavity away from the active cavity and the pilot valve rod is set as a pilot valve sensitive chamber, the shaft drive assembly is located between the pilot valve high-pressure chamber and the pilot valve sensitive chamber, the shaft drive assembly includes a low-pressure ring groove on the rod wall of the pilot valve rod, a high-pressure hole on the inner groove wall of the pilot valve rod, a low-pressure hole on the inner groove wall of the pilot valve rod and a spiral groove on the cavity wall of the movable cavity, an axial through hole communicating with each other is provided between the low-pressure ring groove and the low-pressure hole, and a low-pressure flow channel communicating with the low-pressure ring groove and the active cavity is provided on the pilot valve sleeve.

[0012] Furthermore, the pressure inlet hole P, the working hole A and the oil return hole T are all provided on the pilot valve sleeve of the normally closed pilot valve, the pressure inlet hole P and the working hole A are both located on the corresponding walls of the movable chamber, the oil return hole T is located on the corresponding wall of the movable chamber, a normally closed movable ring groove and a normally closed high-pressure ring groove are provided on the pilot valve stem of the normally closed pilot valve, the normally closed movable ring groove is located between the corresponding movable chamber and the movable chamber, the normally closed high-pressure ring groove is located in the movable chamber and is always communicated with the pressure inlet hole P, and a normally closed high-pressure normally open hole communicating with the normally closed high-pressure ring groove is provided on the inner groove of the pilot valve stem of the normally closed pilot valve;

[0013] A normally open pressure inlet ring groove and a normally open working ring groove are provided in the moving cavity of the normally open pilot valve. The pressure inlet hole P, the working hole A and the oil return hole T are all provided on the pilot valve sleeve of the normally open pilot valve. The pressure inlet hole P is communicated with the normally open pressure inlet ring groove, the working hole A is communicated with the normally open working ring groove, and the oil return hole T is communicated with the corresponding movable cavity. A normally open movable ring groove and a normally open high-pressure ring groove are provided on the pilot valve stem of the normally open pilot valve. The normally open movable ring groove and the normally open high-pressure ring groove are both located in the corresponding moving cavity. The normally open working ring groove is communicated with the normally open movable ring groove, and the normally open high-pressure ring groove is communicated with the normally open pressure inlet ring groove. A normally open high-pressure normally open hole communicated with the normally open high-pressure ring groove is provided on the inner groove of the pilot valve stem of the normally open pilot valve.

[0014] Furthermore, the driving mechanism includes a rotating electromagnet and a linkage mechanism, the rotating electromagnet is arranged on a side of the normally closed pilot valve and the normally open pilot valve away from the main valve sleeve, the rotating output shaft of the rotating electromagnet is parallel to the pilot valve core of the normally closed pilot valve and the pilot valve core of the normally open pilot valve, and the two ends of the rotating output shaft of the rotating electromagnet are respectively connected to the pilot valve core of the normally closed pilot valve and the pilot valve core of the normally open pilot valve through the linkage mechanism;

[0015] The linkage mechanism includes a pilot valve end cover, a shift fork, a shift rod and a circumferential retaining spring, the pilot valve end cover is arranged at one end where the normally closed pilot valve and the normally open pilot valve are away from each other, and one end of the pilot valve core extends out of the pilot valve sleeve and passes through the pilot valve end cover on the corresponding side, and a left pin seat and a right pin seat corresponding to each other are provided on the pilot valve end cover, a pin shaft is provided between the left pin seat and the right pin seat, a circumferential retaining spring is sleeved on the pin shaft, one end of the circumferential retaining spring is connected to the left pin seat, and the other end is connected to a spring retaining ring sleeved on the pin shaft, the shift fork is arranged on the rotating output shaft of the rotating electromagnet, one end of the shift fork extends between the spring retaining ring and the right pin seat and is movably connected to the pin shaft, the shift rod is arranged at one end where the pilot valve core passes through the pilot valve end cover, and the end of the shift rod away from the pilot valve core is cooperatively connected with the end of the shift fork away from the pin shaft.

[0016] Furthermore, the shift rod is provided with a U-shaped opening at one end away from the guide valve core, the shift fork is provided with an arc end at one end facing the shift rod, the arc end of the shift fork extends into the U-shaped opening of the shift rod and is connected to the shift rod, the shift fork is provided with a thin end at one end facing the pin shaft, the thin end of the shift fork is two parallel forked plates, the forked plates are provided with strip openings adapted to the pin shaft, the pin shaft passes through the strip openings of the two forked plates, and the spring retaining ring is pressed against the adjacent forked plates under the action of the circumferential retaining spring.

[0017] Furthermore, a portion of the pilot valve core extending to the outside of the pilot valve sleeve is provided as a movable connection portion, the movable connection portion is cooperatively connected with an end of the shift rod close to the pilot valve core, two symmetrically arranged planar slots are provided on the side of the movable connection portion, the end of the shift rod connected to the movable connection portion is a U-shaped fork, the movable connection portion is located in the U-shaped fork, and the opposite walls on both sides of the U-shaped fork are in corresponding contact with the bottoms of the two planar slots.

[0018] A working method of a two-way hydraulically controlled two-position four-way reversing solenoid valve, including two states: a rotating electromagnet is powered off and a rotating electromagnet is powered on. When the rotating electromagnet is powered off, the pilot valve core of the normally closed pilot valve and the pilot valve core of the normally open pilot valve do not rotate, the pressure of the pilot valve sensitive chamber of the normally closed pilot valve and the high-pressure chamber of the pilot valve are balanced, the working hole A is connected to the normally closed movable ring groove, the normally closed movable ring groove is connected to the corresponding movable chamber, the working hole A is connected to the oil return hole T, and both are in a low-pressure state. The normally closed high-pressure ring groove and the normally closed movable ring groove are cut off from each other, the sensitive chamber 1 is in a low-pressure state, and the normally open pilot valve The pressure of the pilot valve sensitive chamber and the pilot valve high-pressure chamber is balanced, the normally open pressure ring groove and the normally open working ring groove are both connected to the normally open movable ring groove, the normally open movable ring groove is cut off from the corresponding movable chamber, the working hole A is connected to the pressure hole P and is in a high-pressure state, the return oil hole T is cut off from the working hole A and the pressure hole P, and the sensitive chamber 2 is in a high-pressure state. At this time, the guide ring groove 1 is connected to the return oil ring groove 1 and the working ring groove 1, the working hole A is connected to the return oil hole T and is in a low-pressure state, the guide ring groove 2 is connected to the pressure ring groove and the working ring groove 2, and the working hole B is connected to the pressure hole P and is in a high-pressure state;

[0019] When the rotating electromagnet is energized, the pilot valve core of the normally closed pilot valve and the pilot valve core of the normally open pilot valve both rotate, the hole area of ​​the high-pressure hole communicating with the spiral groove increases, and the hole area of ​​the low-pressure hole communicating with the spiral groove decreases. The pressure in the pilot valve sensitive cavity is greater than the pressure in the pilot valve high-pressure cavity, and the pilot valve core moves axially.

[0020] After the pilot valve core moves axially, the working hole A is communicated with the normally closed high-pressure ring groove and is cut off from the normally closed movable ring groove. The working hole A is communicated with the pressure inlet hole P and is both in a high-pressure state. The corresponding sensitive chamber 1 is in a high-pressure state. The normally open movable ring groove is communicated with the normally open working ring groove and the movable chamber. The normally open pressure inlet ring groove and the normally open movable ring groove are cut off from each other. The working hole A is communicated with the oil return hole T and is both in a low-pressure state. The corresponding sensitive chamber 2 is in a low-pressure state. The high pressure in the sensitive chamber 1 drives the main valve core to move and reverse.

[0021] After the main valve core moves, the guide ring groove 1 is connected with the working ring groove 1 and the pressure ring groove, and the working hole A and the pressure inlet hole P are both in a high-pressure state. The guide ring groove 2 is connected with the working ring groove 2 and the oil return ring groove 2, and the working hole B and the oil return hole T' are both in a low-pressure state.

[0022] The beneficial effects of the present invention are:

[0023] 1. The pilot valve group controls the high and low pressure states of the sensitive chamber 1 and the sensitive chamber 2 in the main valve sleeve. By changing the high and low pressure states of the sensitive chamber 1 and the sensitive chamber 2, the main valve core can be moved axially in the main valve sleeve, thereby realizing the switching of the high and low pressure outputs of the working holes A and B of the main valve sleeve. The pilot valve group ensures the stability of the high and low pressure conversion in the sensitive chamber 1 and the sensitive chamber 2, thereby ensuring the stability and reliability of the reversing of the main valve core in the main valve sleeve.

[0024] 2. The working hole A1 of the normally closed pilot valve is connected to the sensitive chamber 1, and the working hole A2 of the normally open pilot valve is connected to the sensitive chamber 2. By controlling the output of the working holes on the normally closed pilot valve and the normally open pilot valve, the pressure in the sensitive chamber 1 and the sensitive chamber 2 can be controlled, thereby controlling the movement of the main valve core in the main valve sleeve and controlling the output of the working holes A and B.

[0025] 3. The pilot valve spring seat is located in the pilot valve ring of the pilot valve stem and is set in the pilot valve sleeve. When the driving mechanism drives the pilot valve stem to rotate through the linkage mechanism, the pilot valve spring seat will not affect the rotation of the pilot valve ring. The shaft drive assembly can realize the axial movement of the pilot valve core in the pilot valve sleeve. When the pressure of the pilot valve sensitive chamber is greater than the pressure of the pilot valve high-pressure chamber and the return spring, the pilot valve core will move axially. Since an axial return spring is connected between the pilot valve spring seat and the pilot valve core, the pilot valve core will compress the return spring when it moves axially, and will not push The dynamic pilot valve spring seat acts, that is, the pilot valve spring seat does not affect the rotation and axial movement of the pilot valve core. When the pilot valve core moves axially in the pilot valve sleeve, it can realize the switching of the high and low pressure outputs of the working hole A1 on the pilot valve sleeve of the normally closed pilot valve and the working hole A2 on the pilot valve sleeve of the normally open pilot valve, thereby realizing the high and low pressure switching of the sensitive cavity 1 and the sensitive cavity 2 in the main valve sleeve, thereby realizing the movement of the main valve core in the main valve sleeve, thereby changing the switching of the high and low pressure outputs of the working hole A and the working hole B on the main valve sleeve, and realizing the output reversing of the present invention.

[0026] 4. When the pilot valve cores of the normally closed pilot valve and the normally open pilot valve are not rotating, the hole areas of the high-pressure hole, the low-pressure hole and the spiral groove are of appropriate size, so that the pressure in the pilot valve sensitive chamber and the pilot valve high-pressure chamber is in a balanced state. When the pilot valve cores of the normally closed pilot valve and the normally open pilot valve are rotating, the hole area between the high-pressure hole and the spiral groove is larger than the hole area before the pilot valve core rotates, and the hole area between the low-pressure hole and the spiral groove is smaller than the hole area before the pilot valve core rotates. This breaks the balance between the pilot valve sensitive chamber and the pilot valve high-pressure chamber, and the pressure in the pilot valve sensitive chamber is greater, and the pressure in the pilot valve high-pressure chamber is smaller, which can cause the pilot valve core to move away from the pilot valve sensitive chamber. When the pilot valve core moves, it can compress the reset spring. When the pilot valve core of the normally closed pilot valve moves, it can change the output of the working hole A1, and when the pilot valve core of the normally open pilot valve moves, it can change the output of the working hole A2.

[0027] 5. The driving mechanism can simultaneously drive the pilot valve core of the normally closed pilot valve and the pilot valve core of the normally open pilot valve to rotate. The rotation of the pilot valve core can break the balance between the pilot valve sensitive chamber and the pilot valve high-pressure chamber, thereby realizing the axial movement of the pilot valve core in the corresponding pilot valve sleeve. The arc end of the shift fork cooperates with the U-shaped opening of the shift rod to ensure the normal axial movement of the pilot valve core, thereby realizing the high and low pressure switching between the working hole A1 and the working hole A2, realizing the high and low pressure switching between the sensitive chamber 1 and the sensitive chamber 2, realizing the reversing of the main valve core in the main valve sleeve, and realizing the reversing function of the present invention.

[0028] 6. When the rotating electromagnet loses power, the restoring force of the circumferential retaining spring can drive the shift fork to rotate through the spring retaining ring, and then drive the shift rod to rotate, and then drive the pilot valve core to gradually return to its initial state. In the process of the pilot valve core gradually returning to its initial state, the balance between the pilot valve sensitive chamber and the pilot valve high-pressure chamber is gradually restored. The reset spring can not only increase the recovery speed of the balance state between the pilot valve sensitive chamber and the pilot valve high-pressure chamber, but also ensure that the initial balance state can be reached between the high pilot valve sensitive chamber and the pilot valve high-pressure chamber. When the pilot valve core returns to its initial state, the working hole A1, working hole A2, working hole A, and working hole B will all return to their initial state, realizing the reversing reset of the present invention after the rotating electromagnet loses power.

[0029] 7. The setting of the movable connection part and the U-shaped fork further ensures that the pilot valve core can move axially while rotating, thereby improving the switching stability of the normally closed pilot valve and the normally open pilot valve to the high and low pressure inputs in the sensitive chamber 1 and the sensitive chamber 2, thereby improving the switching stability of the main valve core in the main valve sleeve.

[0030] 8. The high and low pressure switching of the working hole A and the working hole B on the main valve sleeve of the present invention is jointly controlled by two pilot valves, a normally closed pilot valve and a normally open pilot valve. Compared with the traditional control of a single pilot valve, it has a stronger ability to overcome the hydraulic clamping force and the sticking force caused by excess pollutants, making the switching stability of the high and low pressure output of the working hole higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0033] Figure 2 Schematic diagram of the cross-sectional structure of the normally closed pilot valve in the present invention;

[0034] Figure 3 Schematic diagram of the cross-sectional structure of the normally open pilot valve of the present invention;

[0035] Figure 4 It is a partial schematic diagram of the shaft drive assembly of the present invention;

[0036] Figure 5 Schematic diagram of the linkage structure in the driving mechanism;

[0037] Figure 6 It is a schematic diagram of the connection between the movable connecting part and the shift fork.

[0038] In the figure, 1. main valve sleeve; 2. main valve core; 11. left end cover; 12. right end cover; 13. main spring; 14. sensitive chamber 1; 15. sensitive chamber 2; 16. return oil ring groove 1; 17. working ring groove 1; 18. pressure ring groove; 19. working ring groove 2; 10. return oil ring groove 2; 21. guide ring groove 1; 22. guide ring groove 2; 3. normally closed pilot valve; 4. normally open pilot valve; 51. pilot valve sleeve; 52. pilot valve core; 53. pilot valve spring seat; 54. reset spring; 61. movable chamber; 62. movable chamber; 63. pilot valve high pressure chamber; 64. pilot valve sensitive chamber; 521. end rod; 522. pilot valve ring; 523. pilot valve stem; 7. Shaft drive assembly; 71, low-pressure ring groove; 72, high-pressure hole; 73, low-pressure hole; 74, spiral groove; 511, low-pressure flow channel; 31, normally closed movable ring groove; 32, normally closed high-pressure ring groove; 33, normally closed high-pressure normally open hole; 41, normally open pressure inlet ring groove; 42, normally open working ring groove; 43, normally open movable ring groove; 44, normally open high-pressure ring groove; 45, normally open high-pressure normally open hole; 81, rotating electromagnet; 82, linkage mechanism; 821, pilot valve end cover; 822, shift fork; 823, shift rod; 824, circumferential retaining spring; 91, pin shaft; 92, spring retaining ring; 101, movable connection part; 102, flat slot hole; 103, U-shaped fork mouth. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0040] Example 1:

[0041] Reference Figure 1 A bidirectional, hydraulically controlled, two-position, four-way reversing solenoid valve comprises a main valve housing 1, which is provided with an oil return hole T, a working hole A, a pressure inlet hole P, a working hole B, and an oil return hole T', arranged in sequence along its axial direction. A hidden channel (not shown) is provided in the housing of the main valve housing 1, connecting the oil return hole T and the oil return hole T'. The oil return hole T is connected to an external oil return port via a pipeline, while the working holes A and B are connected to an external working port via pipelines. The pressure inlet hole P is also connected to an external pressurized oil source via a pipeline.

[0042] A main valve core 2 is housed within the main valve housing 1, with its outer wall in contact with the inner wall of the housing 1. The main valve housing 1 is provided with a left end cap 11 and a right end cap 12, respectively, with the main valve core 2 positioned between the left and right end caps 11 and 12. A main spring 13 is mounted on the right end cap 12, with one end of the main valve core 2 extending into the inner ring of the main spring 13 and elastically connected to the right end cap 12. The end of the main valve core 2, away from the right end cap 12, contacts the left end cap 11.

[0043] A first sensitive chamber 14 is provided between the main valve core 2 and the left end cover 11 of the main valve sleeve 1, and a second sensitive chamber 15 is provided between the main valve core 2 and the right end cover 12 of the main valve sleeve 1. When the pressure exerted on the main valve core 2 by the first sensitive chamber 14 is greater than the pressure exerted on the main valve core 2 by the second sensitive chamber 15, the main valve core 2 will move axially within the main valve sleeve 1.

[0044] A pilot valve group is provided on the main valve sleeve 1 , and the pilot valve group controls the switching of high and low pressure inputs to the sensitive chamber 1 14 and the sensitive chamber 2 15 through a driving mechanism.

[0045] The inner bore of the main valve sleeve 1 is provided with an oil return ring groove 16, a working ring groove 17, a pressure ring groove 18, a working ring groove 2 19, and an oil return ring groove 2 10, distributed sequentially along the length of the sleeve 1. The oil return hole T and the oil return hole T' communicate with the oil return ring groove 16 and the oil return ring groove 2 10, respectively. The pressure inlet hole P communicates with the pressure ring groove 18. The working holes A and B communicate with the working ring groove 17 and the working ring groove 2 19, respectively.

[0046] The main valve core 2 is provided with a guide ring groove 1 21 and a guide ring groove 2 22. When the driving mechanism is not working, that is, in the initial state, under the action of the pilot valve group, the sensitive chamber 14 is in a low-pressure state, and the sensitive chamber 2 15 is in a high-pressure state. The guide ring groove 1 21 is connected with the return oil ring groove 16 and the working ring groove 1 17. The working hole A outputs low pressure, the guide ring groove 2 22 is connected with the pressure ring groove 18 and the working ring groove 2 19, and the working hole B outputs high pressure.

[0047] When the driving mechanism switches the high and low pressure inputs of sensitive chamber 14 and sensitive chamber 2 15 through the pilot valve group, sensitive chamber 14 becomes a high-pressure state and sensitive chamber 2 15 becomes a low-pressure state. At this time, the guide ring groove 1 21 is connected with the working ring groove 17 and the pressure ring groove 18, and the working hole A outputs high pressure, while the guide ring groove 2 22 is connected with the working ring groove 2 19 and the return oil ring groove 2 10, and the working hole B outputs low pressure, thereby realizing the conversion of the high and low pressure outputs of the two working holes on the main valve sleeve 1.

[0048] Reference Figure 1-Figure 3The pilot valve group includes a normally closed pilot valve 3 and a normally open pilot valve 4. The normally closed pilot valve 3 and the normally open pilot valve 4 are respectively close to the left end cover 11 and the right end cover 12 of the main valve sleeve 1 on the main valve sleeve 1. The normally closed pilot valve 3 is provided with a pressure inlet hole P1, a working hole A1 and an oil return hole T1. The normally open pilot valve 4 is provided with a pressure inlet hole P2, a working hole A2 and an oil return hole T2. The oil return hole T1 and the oil return hole T2 are both connected to the external low-pressure oil return end, and the pressure inlet hole P1 and the pressure inlet hole P2 are both connected to the external high-pressure oil supply end. The main valve sleeve 1 is provided with a blind channel 1 (not shown in the figure) for connecting the working hole A1 and the sensitive chamber 1 14 and a blind channel 2 (not shown in the figure) for connecting the working hole A2 and the sensitive chamber 2 15.

[0049] When the driving mechanism is not working and the main valve core 2 in the main valve sleeve 1 is only acted upon by the normally closed pilot valve 3 and the normally open pilot valve 4, the normally open pilot valve 4 inputs high pressure into the sensitive chamber 2 15, and the normally closed pilot valve 3 inputs low pressure into the sensitive chamber 1 14. At this time, the main valve core 2 is pressed against the left end cover 11 under the action of the high pressure in the sensitive chamber 2 15, and the main spring 13 is in its original state.

[0050] Both the normally closed pilot valve 3 and the normally open pilot valve 4 include a pilot valve housing 51, a pilot valve core 52, a pilot valve spring seat 53, and a return spring 54. The inner cavity of the pilot valve housing 51 is divided into two parts: an active cavity 61 and a movable cavity 62. The movable cavity 62 is located at one end of the active cavity 61, and the two parts are interconnected. The pilot valve core 52 is disposed within the inner cavity of the pilot valve housing 51 and includes an end rod 521, a pilot valve ring 522, and a pilot valve stem 523. The end rod 521, pilot valve ring 522, and pilot valve stem 523 are coaxially arranged. The pilot valve ring 522 is disposed within the active cavity 61, and the pilot valve stem 523 is adapted to and inserted into the movable cavity 62. One end of the pilot valve stem 523 extends out of the movable cavity 62 and into the pilot valve ring 522, where it is fixedly connected to the pilot valve ring 522. The end of the pilot valve stem 523 located within the movable cavity 62 contacts a contact ball mounted at the end of the movable cavity 62. The end rod 521 is fixed to the side of the pilot valve ring 522 away from the movable cavity 62. The end of the end rod 521 away from the pilot valve ring 522 passes through the end cover on the corresponding side of the pilot valve sleeve 51 and extends out of the movable cavity 61. The end of the end rod 521 extending out of the corresponding movable cavity 61 is connected to the driving mechanism.

[0051] The pilot valve spring seat 53 is a spring seat with an inner groove. The pilot valve spring seat 53 is disposed in the movable chamber 61 and within the pilot valve ring 522. The pilot valve stem 523 is a valve stem with a hollow groove. The inner groove of the pilot valve spring seat 53 and the pilot valve stem 523 are coaxially arranged and mutually adapted. One end of the pilot valve stem 523, which has a hollow groove, is inserted into the inner groove of the pilot valve spring seat 53. The outer wall of the pilot valve stem 523 contacts the inner groove wall of the pilot valve spring seat 53, thereby achieving a sliding connection between the pilot valve stem 523 and the inner groove of the pilot valve spring seat 53. A return spring 54 is disposed between the pilot valve spring seat 53 and the inner annular surface of the pilot valve ring 522 away from the end rod 521.

[0052] Reference Figure 1-Figure 4 The normally closed pilot valve 3 and the normally open pilot valve 4 also include a shaft drive assembly 7 that facilitates axial movement of the pilot valve core 52 within the pilot valve sleeve 51. The space between the pilot valve stem 523 and the inner groove of the pilot valve spring seat 53 is defined as the pilot valve high-pressure chamber 63. The space between the wall of the movable chamber 62 away from the active chamber 61 and the pilot valve stem 523 is defined as the pilot valve sensitive chamber 64. The shaft drive assembly 7 is located between the pilot valve high-pressure chamber 63 and the pilot valve sensitive chamber 64. The shaft drive assembly 7 includes a low-pressure annular groove 71 defined in the wall of the pilot valve stem 523, a high-pressure hole 72 defined in the inner groove wall of the pilot valve stem 523, a low-pressure hole 73 defined in the inner groove wall of the pilot valve stem 523, and a spiral groove 74 defined in the wall of the movable chamber 62. The high-pressure hole 72 and the low-pressure hole 73 are both radial holes perpendicular to the length direction of the pilot valve rod 523. An axial through hole is provided between the low-pressure ring groove 71 and the low-pressure hole 73, and a low-pressure flow channel 511 is provided on the pilot valve sleeve 51 to connect the low-pressure ring groove 71 and the active chamber 61.

[0053] The pressure inlet port P1, working port A1, and oil return port T1 are all provided on the pilot valve sleeve 51 of the normally closed pilot valve 3. The pressure inlet port P1 and working port A1 are both located on the wall of the corresponding movable chamber 62, while the oil return port T1 is located on the wall of the corresponding movable chamber 61. A normally closed movable annular groove 31 and a normally closed high-pressure annular groove 32 are provided on the pilot valve stem 523 of the normally closed pilot valve 3. The normally closed movable annular groove 31 is located between the corresponding movable chamber 61 and the movable chamber 62. The normally closed high-pressure annular groove 32 is located within the movable chamber 62 and is always in communication with the pressure inlet port P1. A normally closed high-pressure normally open hole 33 is provided on the inner groove of the pilot valve stem 523 of the normally closed pilot valve 3, which communicates with the normally closed high-pressure annular groove 32.

[0054] The pressure inlet port P2, working port A2, and oil return port T2 are all provided on the pilot valve sleeve 51 of the normally open pilot valve 4. A normally open pressure inlet ring groove 41 and a normally open working ring groove 42 are provided within the movable chamber 62 of the normally open pilot valve 4. The pressure inlet port P2 communicates with the normally open pressure inlet ring groove 41, the working port A2 communicates with the normally open working ring groove 42, and the oil return port T2 communicates with the corresponding movable chamber 61 via a flow channel. A normally open movable ring groove 43 and a normally open high-pressure ring groove 44 are provided on the pilot valve stem 523 of the normally open pilot valve 4. Both the normally open movable ring groove 43 and the normally open high-pressure ring groove 44 are located within the corresponding movable chamber 62. The normally open working ring groove 42 communicates with the normally open movable ring groove 43, and the normally open high-pressure ring groove 44 communicates with the normally open pressure inlet ring groove 41. A normally open high-pressure continuous hole 45 is provided on the inner groove of the pilot valve stem 523 of the normally open pilot valve 4, communicating with the normally open high-pressure ring groove 44.

[0055] When the driving mechanism is not rotating the pilot valve core 52 of the normally closed pilot valve 3 and the pilot valve core 52 of the normally open pilot valve 4, the pressures within the normally closed pilot valve 3 and the normally open pilot valve 4 are balanced between the pilot valve sensitive chamber 64 and the pilot valve high-pressure chamber 63. The working hole A1 of the normally closed pilot valve 3 is in communication with the normally closed movable annular groove 31, which in turn is in communication with the corresponding movable chamber 61. The working hole A1 and the oil return hole T1 are both in a low-pressure state, while the normally closed high-pressure annular groove 32 and the normally closed movable annular groove 31 are disconnected, forming a mutually blocked state. In the normally open pilot valve 4, the normally open pressure inlet annular groove 41 and the normally open working annular groove 42 are both in communication with the normally open movable annular groove 43, which is blocked from the corresponding movable chamber 61. The working hole A2 is in communication with the pressure inlet hole P2, both in a high-pressure state, and the oil return hole T2 is blocked from both the working hole A2 and the pressure inlet hole P2.

[0056] When the driving mechanism drives the pilot valve core 52 of the normally closed pilot valve 3 and the pilot valve core 52 of the normally open pilot valve 4 to rotate, the area of ​​the hole connecting the high-pressure hole 72 in the normally closed pilot valve 3 and the normally open pilot valve 4 to the spiral groove 74 increases, while the area of ​​the hole connecting the low-pressure hole 73 to the spiral groove 74 decreases, making the pressure in the pilot valve sensitive cavity 64 greater than the pressure in the pilot valve high-pressure cavity 63. This in turn drives the pilot valve core 52 to move axially within the pilot valve sleeve 51 in a direction away from the pilot valve sensitive cavity 64. As the pilot valve core 52 moves away from the pilot valve sensitive cavity 64, the corresponding return spring 54 is compressed. When the driving mechanism drives the pilot valve core 52 to rotate back to its initial state, the return spring 54 can exert a restoring force on the pilot valve core 52, accelerating the return of the pilot valve core 52 to its initial state.

[0057] After the pilot valve core 52 in the normally closed pilot valve 3 rotates and moves axially, the working hole A1 is connected to the normally closed high-pressure annular groove 32 and is cut off from the normally closed movable annular groove 31. At this time, the working hole A1 and the pressure inlet hole P1 are both in a high-pressure state, and the sensitive cavity 14 corresponding to the working hole A1 is also in a high-pressure state.

[0058] After the pilot valve core 52 of the normally open pilot valve 4 rotates and moves axially, the normally open movable annular groove 43 communicates with the normally open working annular groove 42 and the movable cavity 61, the normally open pressure inlet ring groove 41 and the normally open movable annular groove 43 are cut off from each other, the working hole A2 and the oil return hole T2 are both in a low-pressure state, and the sensitive cavity 2 15 corresponding to the working hole A2 is in a low-pressure state.

[0059] Through the above description, the driving mechanism drives the pilot valve core 52 of the normally closed pilot valve 3 and the pilot valve core 52 of the normally open pilot valve 4 to rotate back and forth, which can realize the high and low pressure conversion of the sensitive chamber 14 and the sensitive chamber 2 15 in the main valve sleeve 1, and then realize the high and low pressure switching of the working hole A and the working hole B on the main valve sleeve 1.

[0060] Reference Figure 1 、 Figure 5 and Figure 6 In this embodiment, the drive mechanism can simultaneously drive the rotation of the normally closed pilot valve 3 and the normally open pilot valve 4 without affecting the axial movement of the pilot valve core 52 of the normally closed pilot valve 3 and the normally open pilot valve 4. The drive mechanism includes a rotating electromagnet 81 and a linkage mechanism 82. The rotating electromagnet 81 is a bidirectional electromagnet, and its rotational output shaft is parallel to the pilot valve core 52 of the normally closed pilot valve 3 and the pilot valve core 52 of the normally open pilot valve 4.

[0061] The linkage mechanism 82 is provided between the two ends of the rotational output shaft of the rotary electromagnet 81 and the corresponding pilot valve core 52 of the normally closed pilot valve 3 and the pilot valve core 52 of the normally open pilot valve 4. The rotational output shaft of the rotary electromagnet 81 can simultaneously drive the pilot valve core 52 of the normally closed pilot valve 3 and the pilot valve core 52 of the normally open pilot valve 4 to rotate through the linkage mechanism 82.

[0062] The linkage mechanism 82 includes a pilot valve end cap 821, a shift fork 822, a shift rod 823, and a circumferential retaining spring 824. The pilot valve end cap 821 is mounted on the end away from the normally closed pilot valve 3 and the normally open pilot valve 4. The end rod 521 of the pilot valve core 52 extends from the pilot valve housing 51 and passes through the corresponding pilot valve end cap 821. The pilot valve end cap 821 is provided with a left and right corresponding pin holders. A pin 91 is mounted between the left and right pin holders, and a circumferential retaining spring 824 is mounted on the pin 91. One end of the circumferential retaining spring 824 is connected to the left pin holder, and the other end is connected to a spring retaining ring 92 mounted on the pin 91. The shift fork 822 is fixed to the rotating output shaft of the rotating electromagnet 81. One end of the shift fork 822 extends between the spring retaining ring 92 and the right pin holder and is movably connected to the pin 91. The shift rod 823 is fixed to the end of the end rod 521 that extends through the pilot valve end cap 821. The end of the shift rod 823 that is away from the pilot valve core 52 is mated with the end of the shift fork 822 that is away from the pin 91. The end of the shift rod 823 that is away from the pilot valve core 52 has a U-shaped opening. The end of the shift fork 822 that faces the shift rod 823 is a circular arc. This circular arc end of the shift fork 822 extends into the U-shaped opening of the shift rod 823 and contacts the inner wall of the U-shaped opening. When the rotating electromagnet 81 drives the shift fork 822 to rotate, the circular arc end of the shift fork 822 pushes the shift rod 823, thereby rotating the pilot valve core 52. Because the circular arc end of the shift fork 822 is located within the U-shaped opening and contacts the inner wall of the U-shaped opening, when the pilot valve core 52 moves axially, the pilot valve core 52 drives the shift fork 822 to move in the same direction within the U-shaped opening, achieving simultaneous rotation and axial movement of the pilot valve core 52. This enables the pilot valve core 52 to rotate and move axially at the same time, thereby ensuring the normal switching of the high and low pressure inputs of the sensitive chamber 1 14 and the sensitive chamber 2 15 by the normally closed pilot valve 3 and the normally open pilot valve 4, and ensuring the switching stability of the main valve core 2 in the main valve sleeve 1.

[0063] The end of the shift fork 822 facing the pin 91 is a thin end, and the thin end of the shift fork 822 is composed of two parallel bifurcated plates, each of which has a strip-shaped opening adapted to fit the pin 91. The pin 91 passes through the strip-shaped openings of the two bifurcated plates. The spring retaining ring 92 is pressed against the adjacent bifurcated plates under the action of the circumferential retaining spring 824, thereby achieving a movable connection between the shift fork 822 and the pin 91. When the shift fork 822 rotates, the strip-shaped opening allows the shift fork 822 to rotate to a certain angle without affecting the movement of the bifurcated plates of the shift fork 822 on the pin 91.

[0064] The end rod 521 of the pilot valve core 52 extends through a portion of the pilot valve housing 51 to form a movable connection portion 101. This movable connection portion 101 is mated with the end of the lever 823 proximal to the pilot valve core 52. Two symmetrically arranged planar slots 102 are defined on the side of the movable connection portion 101. The end of the lever 823 that connects to the movable connection portion 101 forms a U-shaped fork 103. The movable connection portion 101 is positioned within this U-shaped fork 103, with the opposing walls of the U-shaped fork 103 contacting the bottoms of the two planar slots 102.

[0065] When the shift rod 823 rotates, the wall of the U-shaped fork 103 will push the movable connection part 101 to rotate, thereby realizing the rotation of the pilot valve core 52. After the pilot valve core 52 rotates, it will move axially under the action of the pilot valve sensitive chamber 64. The U-shaped fork 103 of the shift rod 823 will not affect the axial movement of the pilot valve core 52, ensuring the feasibility of the axial movement of the pilot valve core 52 while rotating, thereby ensuring the normal switching of the high and low pressure inputs of the sensitive chamber 14 and the sensitive chamber 2 15 by the normally closed pilot valve 3 and the normally open pilot valve 4, and ensuring the switching stability of the main valve core 2 in the main valve sleeve 1.

[0066] Example 2:

[0067] This embodiment further provides a working method of a two-way hydraulically controlled two-position four-way reversing solenoid valve based on the first embodiment, including two states of the rotating electromagnet 81 being powered on and powered off.

[0068] After the rotating electromagnet 81 is powered off, the pilot valve core 52 of the normally closed pilot valve 3 and the pilot valve core 52 of the normally open pilot valve 4 do not rotate, the pressure of the pilot valve sensitive chamber 64 of the normally closed pilot valve 3 and the pilot valve high-pressure chamber 63 are balanced, the working hole A is connected to the normally closed movable annular groove 31, the normally closed movable annular groove 31 is connected to the corresponding movable chamber 61, the working hole A is connected to the oil return hole T, and both are in a low-pressure state. The normally closed high-pressure annular groove 32 and the normally closed movable annular groove 31 are cut off from each other, and the sensitive chamber 14 is in a low-pressure state.

[0069] The pressure of the pilot valve sensitive chamber 64 of the normally open pilot valve 4 is balanced with the pressure of the pilot valve high-pressure chamber 63. The normally open pressure inlet ring groove 41 and the normally open working ring groove 42 are both connected to the normally open movable ring groove 43. The normally open movable ring groove 43 is cut off from the corresponding movable chamber 61. The working hole A is connected to the pressure inlet hole P and is in a high-pressure state. The oil return hole T is cut off from the working hole A and the pressure inlet hole P. The sensitive chamber 2 15 is in a high-pressure state.

[0070] At the same time, the guide ring groove 1 21 is connected to the oil return ring groove 16 and the working ring groove 17. The working hole A is connected to the oil return hole T and both are in a low-pressure state. The guide ring groove 2 22 is connected to the pressure ring groove 18 and the working ring groove 2 19. The working hole B is connected to the pressure inlet hole P and outputs high pressure.

[0071] When the rotating electromagnet 81 is energized, the pilot valve core 52 of the normally closed pilot valve 3 and the pilot valve core 52 of the normally open pilot valve 4 both rotate, the area of ​​the hole connecting the high-pressure hole 72 and the spiral groove 74 increases, and the area of ​​the hole connecting the low-pressure hole 73 and the spiral groove 74 decreases. The pressure in the pilot valve sensitive cavity 64 becomes greater than the pressure in the pilot valve high-pressure cavity 63, and the pilot valve core 52 moves axially.

[0072] After the pilot valve core 52 moves axially, the working hole A is communicated with the normally closed high-pressure ring groove 32 and is cut off from the normally closed movable ring groove 31. The working hole A is communicated with the pressure inlet hole P and is both in a high-pressure state. The corresponding sensitive chamber 14 is in a high-pressure state. The normally open movable ring groove 43 is communicated with the normally open working ring groove 42 and the movable chamber 61. The normally open pressure inlet ring groove 41 and the normally open movable ring groove 43 are cut off from each other. The working hole A is communicated with the oil return hole T and is both in a low-pressure state. The corresponding sensitive chamber 2 15 is in a low-pressure state. The high pressure in the sensitive chamber 14 drives the main valve core 2 to move and reverse.

[0073] After the main valve core 2 moves, the guide ring groove 1 21 is connected with the working ring groove 17 and the pressure ring groove 18, and the working hole A and the pressure inlet hole P are both in a high-pressure state. The guide ring groove 2 22 is connected with the working ring groove 2 19 and the oil return ring groove 2 10, and the working hole B and the oil return hole T' are both in a low-pressure state.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A two-way hydraulically controlled two-position four-way reversing solenoid valve, comprising a main valve sleeve (1), characterized in that: The main valve sleeve (1) is provided with an oil return hole T, a working hole A, a pressure inlet hole P, a working hole B and an oil return hole T' in sequence along its axial direction. The oil return hole T and the oil return hole T' are communicated through a dark flow channel provided in the main valve sleeve (1). A main valve core (2) is provided in the main valve sleeve (1). One end of the main valve core (2) is elastically connected to one end cover of the main valve sleeve (1) through a main spring (13), and the other end contacts the opposite end cover of the main valve sleeve (1). A spring is provided between the main valve core (2) and the end cover of the main valve sleeve (1) in contact with it. A sensitive chamber 1 (14) is provided, and a sensitive chamber 2 (15) is provided between the main valve core (2) and the end cover of the main valve sleeve (1) elastically connected thereto. A pilot valve group is provided on the main valve sleeve (1), and the pilot valve group controls the switching of the high and low pressure inputs of the sensitive chamber 1 (14) and the sensitive chamber 2 (15) through a driving mechanism. The high and low pressure states of the sensitive chamber 1 (14) and the sensitive chamber 2 (15) control the movement of the main valve core (2) in the main valve sleeve (1), thereby controlling the high and low pressure outputs of the working hole A and the working hole B. The pilot valve group includes a normally closed pilot valve (3) and a normally open pilot valve (4), the normally closed pilot valve (3) and the normally open pilot valve (4) are respectively close to the two ends of the main valve sleeve (1), the normally closed pilot valve (3) is provided with a pressure inlet hole P1, a working hole A1 and an oil return hole T1, the normally open pilot valve (4) is provided with a pressure inlet hole P2, a working hole A2 and an oil return hole T2, the oil return hole T1 and the oil return hole T2 are both connected to the external low-pressure oil return end, the pressure inlet hole P1 and the pressure inlet hole P2 are both connected to the external high-pressure oil supply end, the main valve sleeve (1) is provided with a blind channel 1 for connecting the working hole A1 and the sensitive chamber 1 (14) and a blind channel 2 for connecting the working hole A2 and the sensitive chamber 2 (15); The normally closed pilot valve (3) and the normally open pilot valve (4) both include a pilot valve sleeve (51), a pilot valve core (52), a pilot valve spring seat (53) and a return spring (54). The inner cavity of the pilot valve sleeve (51) is configured as a movable cavity (61) and a movable cavity (62) that communicate with each other. The pilot valve core (52) is disposed in the inner cavity of the pilot valve sleeve (51). The pilot valve core (52) includes an end rod (521), a pilot valve ring (522) and a pilot valve rod (523). The pilot valve ring (522) is arranged in the movable chamber (61), the pilot valve rod (523) is adapted to the movable chamber (62), the pilot valve rod (523) is arranged in the movable chamber (62) and extends into the pilot valve ring (522) and is connected to the pilot valve ring (522), the end rod (521) is arranged on a side of the pilot valve ring (522) away from the movable chamber (62), and one end of the end rod (521) away from the pilot valve ring (522) extends out of the movable chamber (61) and is connected to the driving mechanism; The pilot valve spring seat (53) is a spring seat with an inner groove. The pilot valve spring seat (53) is arranged in the movable cavity (61) and is located in the pilot valve ring (522). The pilot valve rod (523) is a valve rod with a hollow groove. One end of the hollow groove notch on the pilot valve rod (523) is inserted into the inner groove of the pilot valve spring seat (53) and is slidably matched with the pilot valve spring seat (53). The return spring (54) is arranged between the pilot valve spring seat (53) and the inner ring surface of the pilot valve ring (522) away from the end rod (521). The driving mechanism includes a rotating electromagnet (81) and a linkage mechanism (82), wherein the rotating electromagnet (81) is arranged on a side of the normally closed pilot valve (3) and the normally open pilot valve (4) away from the main valve sleeve (1), and the rotating output shaft of the rotating electromagnet (81) is parallel to the pilot valve core (52) of the normally closed pilot valve (3) and the pilot valve core (52) of the normally open pilot valve (4), and the two ends of the rotating output shaft of the rotating electromagnet (81) are respectively connected to the pilot valve core (52) of the normally closed pilot valve (3) and the pilot valve core (52) of the normally open pilot valve (4) through the linkage mechanism (82); The linkage mechanism (82) includes a pilot valve end cover (821), a shift fork (822), a shift rod (823) and a circumferential retaining spring (824). The pilot valve end cover (821) is arranged at one end of the normally closed pilot valve (3) and the normally open pilot valve (4) that are away from each other. One end of the pilot valve core (52) extending out of the pilot valve sleeve (51) passes through the pilot valve end cover (821) on the corresponding side. The pilot valve end cover (821) is provided with a left pin seat and a right pin seat corresponding to each other. A pin shaft (91) is provided between the left pin seat and the right pin seat. The circumferential retaining spring (824) is sleeved on the pin shaft (91). On the left side, one end of the circumferential retaining spring (824) is connected to the left pin seat, and the other end is connected to the spring retaining ring (92) sleeved on the pin shaft (91); the shift fork (822) is arranged on the rotation output shaft of the rotating electromagnet (81); one end of the shift fork (822) extends between the spring retaining ring (92) and the right pin seat and is movably connected to the pin shaft (91); the shift rod (823) is arranged at one end of the pilot valve core (52) passing through the pilot valve end cover (821); the end of the shift rod (823) away from the pilot valve core (52) is matched with the end of the shift fork (822) away from the pin shaft (91); The portion of the pilot valve core (52) extending to the outside of the pilot valve sleeve (51) is configured as a movable connection portion (101). The movable connection portion (101) is cooperatively connected to one end of the shifting rod (823) close to the pilot valve core (52). Two symmetrically arranged planar slots (102) are provided on the side of the movable connection portion (101). One end of the shifting rod (823) connected to the movable connection portion (101) is a U-shaped fork (103). The movable connection portion (101) is located in the U-shaped fork (103). The opposite walls on both sides of the U-shaped fork (103) are in contact with the bottoms of the two planar slots (102).

2. A two-way hydraulically controlled, two-position, four-way reversing solenoid valve according to claim 1, characterized in that: The inner hole of the main valve sleeve (1) is provided with an oil return ring groove 1 (16), a working ring groove 1 (17), a pressure ring groove (18), a working ring groove 2 (19) and an oil return ring groove 2 (10) which are sequentially distributed along the length direction of the main valve sleeve (1); the oil return hole T and the oil return hole T' are respectively communicated with the oil return ring groove 1 (16) and the oil return ring groove 2 (10); the pressure inlet hole P is communicated with the pressure ring groove (18); the working hole A and the working hole B are respectively communicated with the working ring groove 1 (17) and the working ring groove 2 (19); The main valve core (2) is provided with a guide ring groove 1 (21) and a guide ring groove 2 (22) for controlling the high and low pressure outputs of the working hole A and the working hole B. The guide ring groove 1 (21) and the guide ring groove 2 (22) are sequentially arranged between the sensitive cavity 1 (14) and the sensitive cavity 2 (15) along the axial direction of the main valve core (2).

3. The two-way hydraulically controlled two-position four-way reversing solenoid valve according to claim 1, characterized in that: The normally closed pilot valve (3) and the normally open pilot valve (4) further include a shaft drive assembly (7) for facilitating the axial movement of the pilot valve core (52) in the pilot valve sleeve (51); the space between the pilot valve rod (523) and the inner groove of the pilot valve spring seat (53) is set as a pilot valve high-pressure chamber (63); the space between the cavity wall of the movable cavity (62) away from the movable cavity (61) and the pilot valve rod (523) is set as a pilot valve sensitive chamber (64); the shaft drive assembly (7) is located between the pilot valve high-pressure chamber (63) and the pilot valve sensitive chamber (64). The shaft drive assembly (7) comprises a low-pressure ring groove (71) provided on the rod wall of the pilot valve rod (523), a high-pressure hole (72) provided on the inner groove wall of the pilot valve rod (523), a low-pressure hole (73) provided on the inner groove wall of the pilot valve rod (523), and a spiral groove (74) provided on the cavity wall of the movable cavity (62); an axial through hole communicating with each other is provided between the low-pressure ring groove (71) and the low-pressure hole (73); and a low-pressure flow channel (511) communicating with the low-pressure ring groove (71) and the movable cavity (61) is provided on the pilot valve sleeve (51).

4. A two-way hydraulically controlled, two-position, four-way directional solenoid valve according to claim 1, characterized in that: The pressure inlet hole P1, the working hole A1 and the oil return hole T1 are all provided on the pilot valve sleeve (51) of the normally closed pilot valve (3). The pressure inlet hole P1 and the working hole A1 are both located on the corresponding wall of the movable chamber (62). The oil return hole T1 is located on the corresponding wall of the movable chamber (61). A normally closed movable annular groove (31) and a normally closed high-pressure annular groove (32) are provided on the pilot valve stem (523) of the normally closed pilot valve (3). The normally closed movable annular groove (31) is located between the corresponding movable chamber (61) and the movable chamber (62). The normally closed high-pressure annular groove (32) is located in the movable chamber (62) and is always in communication with the pressure inlet hole P1. A normally closed high-pressure normally open hole (33) in communication with the normally closed high-pressure annular groove (32) is provided on the inner groove of the pilot valve stem (523) of the normally closed pilot valve (3). A normally open pressure inlet ring groove (41) and a normally open working ring groove (42) are provided in the movable chamber (62) of the normally open pilot valve (4). The pressure inlet hole P2, the working hole A2 and the oil return hole T2 are all provided on the pilot valve sleeve (51) of the normally open pilot valve (4). The pressure inlet hole P2 is communicated with the normally open pressure inlet ring groove (41), the working hole A2 is communicated with the normally open working ring groove (42), and the oil return hole T2 is communicated with the corresponding movable chamber (61). The pilot valve stem ( A normally open movable ring groove (43) and a normally open high-pressure ring groove (44) are provided on the normally open movable ring groove (43), and the normally open high-pressure ring groove (44) are both located in the corresponding movable cavity (62). The normally open working ring groove (42) is communicated with the normally open movable ring groove (43), and the normally open high-pressure ring groove (44) is communicated with the normally open pressure inlet ring groove (41). A normally open high-pressure normally open hole (45) is provided on the inner groove of the pilot valve stem (523) of the normally open pilot valve (4) and is communicated with the normally open high-pressure ring groove (44).

5. The two-way hydraulically controlled two-position four-way reversing solenoid valve according to claim 1, characterized in that: The shift rod (823) is provided with a U-shaped opening at one end away from the guide valve core (52); the shift fork (822) is provided with an arc end at one end facing the shift rod (823); the arc end of the shift fork (822) extends into the U-shaped opening of the shift rod (823) and is connected to the shift rod (823); the shift fork (822) is provided with a thin end at one end facing the pin shaft (91); the thin end of the shift fork (822) is two parallel bifurcated plates; the bifurcated plates are provided with strip openings adapted to the pin shaft (91); the pin shaft (91) passes through the strip openings of the two bifurcated plates; the spring retaining ring (92) is pressed against the adjacent bifurcated plates under the action of the circumferential retaining spring (824).

6. A method for operating a two-way hydraulically controlled, two-position, four-way reversing solenoid valve according to any one of claims 1 to 5, comprising two states: a rotating electromagnet (81) being powered off and a rotating electromagnet (81) being powered on, characterized in that: When the rotating electromagnet (81) is powered off, the pilot valve core (52) of the normally closed pilot valve (3) and the pilot valve core (52) of the normally open pilot valve (4) do not rotate, the pressures of the pilot valve sensitive chamber (64) and the pilot valve high pressure chamber (63) of the normally closed pilot valve (3) are balanced, the working hole A1 is communicated with the normally closed movable ring groove (31), the normally closed movable ring groove (31) is communicated with the corresponding movable chamber (61), the working hole A1 is communicated with the oil return hole T1 and both are in a low pressure state, the normally closed high pressure ring groove (32) and the normally closed movable ring groove (31) are cut off from each other, the sensitive chamber 1 (14) is in a low pressure state, the pilot valve sensitive chamber (64) of the normally open pilot valve (4) and the pilot valve high pressure chamber (63) are in a low pressure state, and the pressures of the pilot valve sensitive chamber (64) and the pilot valve high pressure chamber (63) of the normally open pilot valve (4) are in a low pressure state. Pressure is balanced, the normally open pressure ring groove (41) and the normally open working ring groove (42) are both connected to the normally open movable ring groove (43), the normally open movable ring groove (43) and the corresponding movable cavity (61) are cut off, the working hole A2 and the pressure hole P2 are both connected in a high-pressure state, the return oil hole T2 and the working hole A2 and the pressure hole P2 are both cut off, the sensitive cavity 2 (15) is in a high-pressure state, at this time, the guide ring groove 1 (21) is connected to the return oil ring groove 1 (16) and the working ring groove 1 (17), the working hole A is connected to the return oil hole T and is both in a low-pressure state, the guide ring groove 2 (22) is connected to the pressure ring groove (18) and the working ring groove 2 (19), and the working hole B and the pressure hole P are both in a high-pressure state; When the rotating electromagnet (81) is energized, the pilot valve core (52) of the normally closed pilot valve (3) and the pilot valve core (52) of the normally open pilot valve (4) both rotate, the area of ​​the hole connecting the high-pressure hole (72) and the spiral groove (74) increases, and the area of ​​the hole connecting the low-pressure hole (73) and the spiral groove (74) decreases. The pressure of the pilot valve sensitive chamber (64) becomes greater than the pressure of the pilot valve high-pressure chamber (63), and the pilot valve core (52) moves axially. After the pilot valve core (52) moves axially, the working hole A1 is communicated with the normally closed high-pressure ring groove (32) and is cut off from the normally closed movable ring groove (31). The working hole A1 is communicated with the pressure inlet hole P1 and is in a high-pressure state. The corresponding sensitive chamber 1 (14) is in a high-pressure state. The normally open movable ring groove (43) is communicated with the normally open working ring groove (42) and the movable chamber (61). The normally open pressure inlet ring groove (41) and the normally open movable ring groove (43) are cut off from each other. The working hole A2 is communicated with the oil return hole T2 and is in a low-pressure state. The corresponding sensitive chamber 2 (15) is in a low-pressure state. The high pressure in the sensitive chamber 1 (14) pushes the main valve core (2) to move and reverse. After the main valve core (2) moves, the guide ring groove 1 (21) is connected with the working ring groove 1 (17) and the pressure ring groove (18), and the working hole A and the pressure inlet hole P are both in a high-pressure state. The guide ring groove 2 (22) is connected with the working ring groove 2 (19) and the oil return ring groove 2 (10), and the working hole B and the oil return hole T' are both in a low-pressure state.

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