On-off valve, hydraulic system, and working machine

Abstract

The utility model relates to technical field of hydraulic element provides a kind of on-off valve, hydraulic system and operating machine.In on-off valve, one end of connecting rod is connected with electromagnetic armature assembly, the other end of connecting rod can extend to the end of push rod, the other end of push rod is connected with valve body assembly.Electromagnetic armature assembly can drive connecting rod to press push rod and drive valve body assembly to switch to closed position or open position.By introducing connecting rod as the rigid force transmission intermediary between electromagnetic armature assembly and push rod, the axial length of push rod is shortened, so that its length-diameter ratio is reduced.Therefore, the technical problems of complex processing technology, high manufacturing cost and easy bending deformation caused by too large length-diameter ratio of traditional slender push rod are effectively solved, the structural strength and rigidity of push rod are improved, the harsh requirement of processing precision is reduced, the processing feasibility and assembly tolerance of parts are improved, meanwhile, the reliability of on-off valve is improved and its service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic component technology, and in particular to a switching valve, a hydraulic system and a working machine. Background Technology

[0002] An electromagnetic switching valve is a common component that uses the magnetic force generated by energizing an electromagnet to drive a valve core, thereby controlling the flow or direction of fluid. In existing designs, the armature attracted by the electromagnet typically pushes the valve core directly via a slender push rod to switch states. However, the push rod in this design often has a large length-to-diameter ratio, significantly increasing the difficulty of its manufacturing process. Furthermore, it has relatively weak structural strength under load, making it prone to bending or deformation, thus affecting the valve's reliability and lifespan. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a switching valve, a hydraulic system, and a working machine.

[0004] In a first aspect, this utility model provides a switching valve, comprising: an electromagnetic armature assembly; a connecting rod, one end of which is connected to the electromagnetic armature assembly; a push rod, one end of which extends to the other end of the connecting rod; and a valve body assembly, which is connected to the other end of the push rod, the valve body assembly having a closed position and an open position.

[0005] The electromagnetic armature assembly can drive the connecting rod to press against the push rod, thereby switching the valve body assembly to the closed position or the open position.

[0006] According to the present invention, a switching valve is provided, wherein the electromagnetic armature assembly includes a disc-shaped electromagnet structure, the disc-shaped electromagnet structure being connected to one end of the connecting rod, and the disc-shaped electromagnet structure being able to drive the connecting rod to press against the push rod to switch the valve body assembly to the closed position or the open position.

[0007] According to the present invention, a switching valve is provided, wherein the disc electromagnet structure includes: a yoke, on which an annular cavity and a guide hole are coaxially arranged, the diameter of the guide hole being smaller than the inner diameter of the annular cavity; a coil, the coil being sleeved inside the annular cavity; a baffle, the baffle being connected to the port of the annular cavity to limit the coil to the annular cavity; a housing, the housing being sleeved outside the yoke, the inner end of the yoke forming a limiting cavity with the inner wall of the housing; and an armature assembly, one end of the armature assembly being slidably limited to the limiting cavity, and the other end of the armature assembly being slidably inserted into the guide hole and connected to one end of the connecting rod.

[0008] According to the present invention, a switching valve is provided, wherein the armature assembly includes: a limiting plate, the limiting plate being slidably connected to the limiting cavity; an armature body, one end of the armature body being connected to the limiting plate, the other end of the armature body being inserted into the guide hole, and the armature body having a buffer cavity; and a buffer spring, the buffer spring being installed in the buffer cavity.

[0009] One end of the connecting rod passes through the end of the armature body away from the limiting plate into the buffer cavity, and is slidably limited to the buffer spring and the buffer cavity.

[0010] According to the present invention, a switch valve is provided with an installation port at the end of the buffer chamber away from the limiting plate.

[0011] The armature assembly further includes: a limiting block, which is installed in the mounting port; one end of the connecting rod passes through the limiting block into the buffer cavity and is slidably limited to be connected between the limiting block and the buffer spring.

[0012] According to the present invention, a switching valve is provided, the valve body assembly comprising: a valve sleeve connected to a yoke, the valve sleeve having a return oil port and a load oil port; a valve seat installed inside the valve sleeve, the valve seat having a first oil port, a second oil port and a third oil port, the first oil port communicating with the return oil port, and the second oil port communicating with the load oil port; a valve core movably connected to the valve seat, the valve core being able to communicate between the second oil port and the first oil port, or between the second oil port and the third oil port; an oil inlet block installed inside the valve seat, the oil inlet block having a pressure oil port communicating with the third oil port, and the oil inlet block having a reset cavity; a reset spring installed inside the reset cavity; and a reset rod, one end of the reset rod extending into the reset cavity and pressing against the end of the reset spring, the other end of the reset rod being pressed against one side of the valve core by the valve seat.

[0013] The end of the push rod away from the connecting rod passes through the valve sleeve and extends from the valve seat to the other side of the valve core.

[0014] According to the present invention, a switching valve is provided, wherein the valve core is provided with an open position and a closed position; the armature body can drive the push rod to push the valve core to switch to the closed position through the connecting rod. In the closed position, the second oil port is connected to the first oil port, and the second oil port is cut off from the third oil port.

[0015] The reset spring can drive the reset rod to push the valve core to switch to the open position. In the open position, the second oil port is connected to the third oil port, and the second oil port is cut off from the first oil port.

[0016] According to the present invention, a switching valve is provided, wherein the valve core includes a spherical core body, which is movably installed into the valve seat.

[0017] A second aspect of this invention provides a hydraulic system including the switching valve described above.

[0018] A third aspect of this utility model provides a working machine, including the switching valve or hydraulic system described above.

[0019] The switching valve provided by this utility model includes an electromagnetic armature assembly, a connecting rod, a push rod, and a valve body assembly. One end of the connecting rod is connected to the electromagnetic armature assembly, and the other end of the connecting rod extends to one end of the push rod, the other end of which is connected to the valve body assembly. The valve body assembly has a closed position and an open position. The electromagnetic armature assembly can drive the connecting rod to press against the push rod, thereby switching the valve body assembly to the closed or open position.

[0020] As described above, by introducing a connecting rod as a rigid force transmission intermediary between the electromagnetic armature assembly and the push rod, the axial length of the push rod is significantly shortened, thereby greatly reducing its length-to-diameter ratio. This effectively solves the technical problems of complex processing, high manufacturing costs, and susceptibility to bending deformation or instability caused by the excessively large length-to-diameter ratio of traditional slender push rods. It significantly improves the structural strength and rigidity of the push rod, reduces its stringent requirements for machining accuracy, improves the feasibility of part machining and assembly tolerance, and simultaneously enhances the reliability of the switching valve and extends its service life.

[0021] Furthermore, since both the hydraulic system and the working machinery provided by this utility model include the switching valves described above, they also possess the advantages described above. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the switching valve provided by this utility model.

[0024] Reference numerals: 100, Disc electromagnet structure; 110, Yoke; 111, Annular cavity; 112, Guide perforation; 120, Coil; 130, Baffle; 140, Housing; 141, Limiting cavity; 151, Limiting plate; 152, Armature body; 160, Buffer spring; 170, Limiting block; 200, Connecting rod; 300, Push rod; 400, Valve body assembly; 410, Valve sleeve; 411, Return port; 412, Load port; 420, Valve seat; 421, First port; 422, Second port; 423, Third port; 430, Valve core; 440, Inlet block; 441, Pressure port; 450, Return spring; 460, Return rod. Detailed Implementation

[0025] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0026] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0028] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, to make the objectives, technical solutions, and advantages of the present invention clearer. The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The following is combined Figure 1 This invention describes a switching valve, a hydraulic system, and a working machine according to embodiments of the present invention. It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute any particular limitation on the present invention.

[0031] An embodiment of the first aspect of this utility model provides a switching valve, such as... Figure 1 As shown, the switching valve includes: an electromagnetic armature assembly; a connecting rod 200, one end of which is connected to the electromagnetic armature assembly; a push rod 300, one end of which can extend to the other end of the connecting rod 200; and a valve body assembly 400, which is connected to the other end of the push rod 300, and the valve body assembly 400 has a closed position and an open position.

[0032] The electromagnetic armature assembly can drive the connecting rod 200 to press against the push rod 300, thereby switching the valve body assembly 400 to the closed or open position.

[0033] The switching valve provided by this utility model includes an electromagnetic armature assembly, a connecting rod 200, a push rod 300, and a valve body assembly 400. One end of the connecting rod 200 is connected to the electromagnetic armature assembly, and the other end of the connecting rod 200 extends to one end of the push rod 300. The other end of the push rod 300 is connected to the valve body assembly 400. The valve body assembly 400 has a closed position and an open position. The electromagnetic armature assembly can drive the connecting rod 200 to press against the push rod 300, thereby switching the valve body assembly 400 to the closed position or the open position.

[0034] As described above, by introducing the connecting rod 200 as a rigid force transmission intermediary between the electromagnetic armature assembly and the push rod 300, the axial length of the push rod 300 is significantly shortened, thereby greatly reducing its length-to-diameter ratio. This effectively solves the technical problems of complex processing, high manufacturing costs, and susceptibility to bending deformation or instability caused by the excessively large length-to-diameter ratio of traditional slender push rods 300. It significantly improves the structural strength and rigidity of the push rod 300, reduces its stringent requirements for machining accuracy, improves the feasibility of part machining and assembly tolerance, and simultaneously enhances the reliability of the switching valve and extends its service life.

[0035] In one embodiment of this utility model, the electromagnetic armature assembly includes: a disc electromagnet structure 100, which is connected to one end of a connecting rod 200. The disc electromagnet structure 100 can drive the connecting rod 200 to press against the push rod 300, thereby switching the valve body assembly 400 to the closed position or the open position.

[0036] By adopting a disc electromagnet structure 100 as the driving core, its flat and compact topology design significantly reduces the axial space occupied by the electromagnetic armature assembly, and works in conjunction with the short push rod 300 structure to achieve overall miniaturization of the valve body. At the same time, due to its short magnetic circuit and low magnetic leakage, this structure has higher magnetic energy conversion efficiency and power density, which can generate stronger and more stable electromagnetic driving force, ensuring that the connecting rod 200 presses against the push rod 300 more quickly and fully, thereby greatly improving the response speed and operational reliability of the valve core 430 switching. In addition, the superior heat dissipation characteristics of the disc electromagnet effectively reduce the temperature rise of the coil 120, further enhancing the durability and lifespan of the system under frequent start-stop or high-load conditions, and comprehensively optimizing the dynamic performance and space adaptability of the electromagnetic switching valve.

[0037] In one embodiment of this utility model, the disc electromagnet structure 100 includes: a yoke 110, on which an annular cavity 111 and a guide hole 112 are coaxially arranged, the diameter of the guide hole 112 being smaller than the inner diameter of the annular cavity 111; a coil 120, which is sleeved inside the annular cavity 111; a baffle 130, which is connected to the port of the annular cavity 111 to limit the coil 120 inside the annular cavity 111; a housing 140, which is sleeved outside the yoke 110, and a limiting cavity 141 is formed between the inner end of the yoke 110 and the inner wall of the housing 140; and an armature assembly, one end of which is slidably limited to the limiting cavity 141, and the other end of which is slidably inserted into the guide hole 112 and connected to one end of the connecting rod 200.

[0038] In one embodiment of this utility model, the armature assembly includes: a limiting plate 151, which is slidably connected to the limiting cavity 141; an armature body 152, one end of which is connected to the limiting plate 151, and the other end of which passes through the guide hole 112, and the armature body 152 has a buffer cavity; and a buffer spring 160, which is installed in the buffer cavity.

[0039] One end of the connecting rod 200 passes through the end of the armature body 152 away from the limiting plate 151 into the buffer cavity, and is slidably limited to the buffer spring 160 between the buffer cavity and the buffer spring.

[0040] In one embodiment of this utility model, an installation port is provided at the end of the buffer cavity away from the limiting plate 151.

[0041] The armature assembly also includes a limiting block 170, which is installed to the mounting port.

[0042] One end of the connecting rod 200 is inserted into the buffer cavity through the limiting block 170 and is slidably limited between the limiting block 170 and the buffer spring 160.

[0043] Furthermore, in one embodiment of this utility model, the valve body assembly 400 includes: a valve sleeve 410, which is connected to the yoke 110, and has a return oil port 411 and a load oil port 412; a valve seat 420, which is installed inside the valve sleeve 410, and has a first oil port 421, a second oil port 422 and a third oil port 423, wherein the first oil port 421 communicates with the return oil port 411, and the second oil port 422 communicates with the load oil port 412; and a valve core 430, which is movably connected to the valve seat 420 and is capable of communicating with the second oil port 423. Port 422 is connected to the first oil port 421, or the second oil port 422 is connected to the third oil port 423; oil inlet block 440 is installed in the valve seat 420, and a pressure oil port 441 is opened on the oil inlet block 440, which is connected to the third oil port 423, and a reset cavity is provided on the oil inlet block 440; reset spring 450 is installed in the reset cavity; reset rod 460, one end of the reset rod 460 extends into the reset cavity and presses against the end of the reset spring 450, and the other end of the reset rod 460 is pressed against one side of the valve core 430 by the valve seat 420.

[0044] The end of the push rod 300 away from the connecting rod 200 passes through the valve sleeve 410 and extends from the valve seat 420 to the other side of the valve core 430.

[0045] Furthermore, in one embodiment of this utility model, the valve core 430 is provided with an open position and a closed position. The armature body 152 can drive the push rod 300 through the connecting rod 200 to push the valve core 430 to switch to the closed position. In the closed position, the second oil port 422 is connected to the first oil port 421, and the second oil port 422 is closed from the third oil port 423. The return spring 450 can drive the return rod 460 to push the valve core 430 to switch to the open position. In the open position, the second oil port 422 is connected to the third oil port 423, and the second oil port 422 is closed from the first oil port 421.

[0046] For example, such as Figure 1 As shown, an annular cavity 111 is formed on the yoke 110. The upper end of the annular cavity 111 has a port, i.e., an open end, and the lower end of the annular cavity 111 is closed. The coil 120 can be fitted into the annular cavity 111 through the upper port, and a baffle 130 is installed at the upper port of the annular cavity 111 to limit the coil 120 within the annular cavity 111. A housing 140 is fitted outside the yoke 110, and a gap is formed between the inner top surface of the housing 140 and the upper end surface of the yoke 110, i.e., a limiting cavity 141. A guide hole 112 is also formed on the yoke 110, which penetrates the yoke 110 and is coaxially arranged with the annular cavity 111. The diameter of the guide hole 112 is smaller than the inner diameter of the annular cavity 111.

[0047] The limiting plate 151 is located within the limiting cavity 141 and can slide up and down within the limiting cavity 141. One end of the armature body 152 is connected to the lower end of the limiting plate 151, and the other end of the armature body 152 passes through the guide hole 112. A buffer cavity is formed axially on the armature body 152, the upper end of the buffer cavity is closed, and the lower end of the buffer cavity is provided with an installation port. A limiting block 170 is installed at the installation port. A buffer spring 160 is installed in the buffer cavity. The upper end of the connecting rod 200 passes through the limiting block 170 and is slidably limited between the buffer spring 160 and the limiting block 170. The lower end of the guide hole 112 is connected to the valve sleeve 410.

[0048] The valve sleeve 410 has an axial inner cavity, which is closed at the upper end and open at the lower end. The valve seat 420 is installed into the axial inner cavity of the valve sleeve 410 through its lower opening. The valve core 430 is movably installed inside the valve seat 420, and an oil inlet block 440 is installed at the lower end of the valve seat 420. The upper end of the push rod 300 extends to the lower end of the connecting rod 200, and the lower end of the push rod 300 passes through the top of the valve sleeve 410 and extends to the upper side of the valve core 430 inside the valve seat 420.

[0049] The oil inlet block 440 has a reset chamber along the axial direction. The lower end of the reset chamber is closed, and the upper end of the reset chamber is open. A reset spring 450 is installed in the reset chamber. A reset rod 460 is slidably connected to the reset chamber, and the lower end of the reset rod 460 presses against the upper end of the reset spring 450. The upper end of the reset rod 460 extends to the lower side of the valve core 430 inside the valve seat 420.

[0050] The valve seat 420 has a return port 411 and a load port 412, and the inlet block 440 has a pressure port 441. The valve seat 420 also has a first port 421, a second port 422, and a third port 423. The first port 421 is connected to the return port 411, the second port 422 is connected to the load port 412, and the third port 423 is connected to the pressure port 441. The valve core 430 can move within the valve seat 420 to connect the second port 422 and the first port 421 and disconnect the second port 422 and the third port 423, or connect the second port 422 and the third port 423 and disconnect the second port 422 and the first port 421.

[0051] In this embodiment, when the armature assembly is energized, the armature body 152 can drive the connecting rod 200 to move downward. The connecting rod 200 then presses against the push rod 300 to push the valve core 430 downward, causing the valve core 430 to block the third oil port 423. At this time, the second oil port 422 connects to the first oil port 421, and the load oil port 412 connects to the return oil port 411, meaning the valve core 430 switches to the closed position. When the armature assembly is de-energized, the return spring 450 can drive the valve core 430 to move upward. The valve core 430 can then push the armature body 152 back to its original position via the push rod 300 and the connecting rod 200. At this time, the valve core 430 can block the first oil port 421, causing the second oil port 422 to connect to the third oil port 423, and the load oil port 412 connects to the pressure oil port 441, meaning the valve core 430 switches to the open position.

[0052] As described above, the switching valve is equipped with two elastic components, a buffer spring 160 and a return spring 450, which can reduce the impact fatigue caused by alternating loads during high-frequency opening and closing and extend the service life of the switching valve.

[0053] In another embodiment of this utility model, the valve core 430 includes a spherical core, which is movably installed within the valve seat 420. The spherical valve core 430 can achieve self-alignment and fit on the sealing surface of the valve seat 420, which can significantly improve the uniformity of sealing.

[0054] A second aspect of this utility model provides a hydraulic system including the switching valve described above.

[0055] A third aspect of this utility model provides a working machine, including a switching valve or hydraulic system as described above.

[0056] Furthermore, since both the hydraulic system and the working machinery provided by this utility model include the switching valves described above, they both possess the advantages described above.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A switching valve, characterized in that, include: Electromagnetic armature assembly; A connecting rod (200), one end of which is connected to the electromagnetic armature assembly; A push rod (300), one end of which can extend to the other end of the connecting rod (200); A valve body assembly (400) is connected to the other end of the push rod (300), and the valve body assembly (400) is provided with a closed position and an open position; The electromagnetic armature assembly can drive the connecting rod (200) to press against the push rod (300) and drive the valve body assembly (400) to switch to the closed position or the open position.

2. The switching valve according to claim 1, characterized in that, The electromagnetic armature assembly includes: A disc electromagnet structure (100) is connected to one end of the connecting rod (200). The disc electromagnet structure (100) can drive the connecting rod (200) to press against the push rod (300) and drive the valve body assembly (400) to switch to the closed position or the open position.

3. The switching valve according to claim 2, characterized in that, The disc electromagnet structure (100) includes: A yoke (110) is provided with an annular cavity (111) and a guide hole (112) coaxially arranged on the yoke (110). The diameter of the guide hole (112) is smaller than the inner diameter of the annular cavity (111). A coil (120) is fitted into the annular cavity (111); A baffle (130) is connected to the port of the annular cavity (111) to limit the coil (120) into the annular cavity (111); The housing (140) is fitted onto the outside of the yoke (110), and a limiting cavity (141) is formed between the inner end of the yoke (110) and the inner wall of the housing (140). An armature assembly, one end of which is slidably limited to the limiting cavity (141), and the other end of which is slidably inserted into the guide hole (112) and connected to one end of the connecting rod (200).

4. The switching valve according to claim 3, characterized in that, The armature assembly includes: A limiting plate (151) is slidably connected to the limiting cavity (141); An armature body (152) is provided, one end of which is connected to the limiting plate (151), and the other end of which is inserted into the guide hole (112). The armature body (152) is provided with a buffer cavity. A buffer spring (160) is installed inside the buffer cavity; One end of the connecting rod (200) passes through the end of the armature body (152) away from the limiting plate (151) into the buffer cavity, and is slidably limited to the buffer spring (160) and the buffer cavity.

5. The switching valve according to claim 4, characterized in that, The buffer cavity is provided with an installation port at the end away from the limiting plate (151); The armature assembly also includes: A limiting block (170) is installed to the mounting port; One end of the connecting rod (200) is inserted into the buffer cavity by the limiting block (170) and is slidably limited between the limiting block (170) and the buffer spring (160).

6. The switching valve according to claim 5, characterized in that, The valve body assembly (400) includes: Valve sleeve (410) is connected to the yoke (110). The valve sleeve (410) has an oil return port (411) and a load port (412). Valve seat (420), the valve seat (420) is installed inside the valve sleeve (410), the valve seat (420) is provided with a first oil port (421), a second oil port (422) and a third oil port (423), the first oil port (421) is connected to the return oil port (411), and the second oil port (422) is connected to the load oil port (412); Valve core (430), which is movably connected to the valve seat (420), and the valve core (430) can connect the second oil port (422) with the first oil port (421), or connect the second oil port (422) with the third oil port (423). An oil inlet block (440) is installed inside the valve seat (420). A pressure oil port (441) is provided on the oil inlet block (440). The pressure oil port (441) is connected to the third oil port (423). A reset chamber is provided on the oil inlet block (440). A reset spring (450) is installed inside the reset cavity; A reset rod (460) has one end extending into the reset cavity and pressing against the end of the reset spring (450), and the other end of the reset rod (460) is pressed against one side of the valve core (430) by the valve seat (420). The end of the push rod (300) away from the connecting rod (200) passes through the valve sleeve (410) and extends from the valve seat (420) to the other side of the valve core (430).

7. The switching valve according to claim 6, characterized in that, The valve core (430) is provided with the open position and the closed position; The armature body (152) can drive the push rod (300) through the connecting rod (200) to push the valve core (430) to switch to the closed position. In the closed position, the second oil port (422) is connected to the first oil port (421), and the second oil port (422) is cut off from the third oil port (423). The reset spring (450) can drive the reset rod (460) to push the valve core (430) to switch to the open position. In the open position, the second oil port (422) is connected to the third oil port (423), and the second oil port (422) is cut off from the first oil port (421).

8. The switching valve according to claim 6 or 7, characterized in that, The valve core (430) includes: A spherical core is movably installed inside the valve seat (420).

9. A hydraulic system, characterized in that, include: The switching valve as described in any one of claims 1 to 8.

10. A type of operating machinery, characterized in that, include: The switching valve as described in any one of claims 1 to 8; or, The hydraulic system as described in claim 9.

Images