Electromagnetic-manual dual control electromagnetic valve

Abstract

This invention relates to the field of valve technology, and more particularly to a solenoid valve with both electromagnetic and manual control. The solenoid valve includes a valve sleeve, a valve core movably disposed within the valve sleeve, an electromagnetic drive mechanism, and a manual operation mechanism. The electromagnetic drive mechanism includes a front actuator, a tail actuator, a first moving iron, a second moving iron, and a central push rod. The first moving iron is movably disposed in the front actuator and directly connected to the valve core; the second moving iron is movably disposed in the tail actuator; the central push rod is slidably disposed in the front actuator, with its two ends respectively abutting against the first and second moving irons. The manual operation mechanism includes a handle and a transmission rod. The handle is threaded to the end of the tail actuator facing away from the valve sleeve. One end of the transmission rod is connected to the handle, and the other end passes sequentially through the tail actuator and the central push rod, slidably passing through the first moving iron and being drively connected to it. The solenoid valve with both electromagnetic and manual control is convenient to operate and has high assembly precision.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a solenoid valve with both electromagnetic and manual control. Background Technology

[0002] Solenoid valves are widely used in automotive, air conditioning, chemical production, hydropower, and medical fields due to their advantages of compact structure, small size, light weight, low price, fast action, low power consumption, high reliability, and convenient maintenance. Solenoid valves with both electromagnetic and manual control integrate electromagnetic automatic control and manual emergency operation. Even in the event of power failure, coil burnout, or control system malfunction, they can still be forcibly switched or reversed via a mechanical handle to ensure system safety and emergency controllability.

[0003] Figure 1 and Figure 2 The diagram illustrates a solenoid valve with both electromagnetic and manual control. In case of manual emergency operation, the operator can press handle 1' to the right, which in turn moves the second link 3' and the moving iron 4' to the right via the first link 2', thereby moving the valve core 5' to the right position. Alternatively, the operator can pull handle 1' to the left, which in turn moves the moving iron 4' to the left via the first link 2', thereby moving the valve core 5' to the left position via the second link 3'. When the operator releases handle 1', the moving iron 4' and valve core 5' return to their original positions under the elastic restoring force of the first elastic element 6' and the second elastic element 7'.

[0004] However, this solenoid valve typically has the following problems during use: 1) When pulling or pressing handle 1', the internal hydraulic pressure of the solenoid valve must be directly overcome. Especially under high flow and high pressure conditions, the hydraulic pressure increases significantly, which can easily lead to manual operation being difficult, reversing being difficult, or even failing to push the valve core 5' into place. Moreover, after the operator releases handle 1', the moving iron 4' and valve core 5' will immediately return to the neutral position, which is difficult to meet the usage requirements of maintaining the reversing state for a long time under emergency conditions.

[0005] 2) One end of the second connecting rod 3' is connected to the moving iron 4' via a cylindrical pin, and the other end of the second connecting rod 3' is connected to the valve core 5' via a cylindrical pin. During actual assembly, the cylindrical pin between the moving iron 4' and the second connecting rod 3' should fit within one of the gaps in both connections, and similarly, the cylindrical pin between the valve core 5' and the second connecting rod 3' should also fit within one of the gaps in both connections, thus preventing jamming between the moving iron 4' and the valve core 5' during movement. However, the superposition of gaps between the moving iron 4' and the second connecting rod 3', and between the valve core 5' and the second connecting rod 3', can easily amplify the overall assembly error between the moving iron 4' and the valve core 5', leading to a decrease in the synchronicity of their movements and consequently affecting the control accuracy of the solenoid valve.

[0006] 3) When the operator presses the handle 1' to the right, it pushes the second link 3' through the first link 2', which in turn drives the valve core 5' to move to the right. However, it is difficult to accurately control the pressure applied manually. If the operator applies too much force, the first link 2' will generate a large impact load and directly hit the second link 3'. Since the outer diameter of the second link 3' is small and its bending strength is limited, it is easy to bend and deform under instantaneous impact and compression, which will cause the valve core 5' to jam and not move properly, affecting the overall switching accuracy and normal working reliability of the solenoid valve.

[0007] Therefore, there is an urgent need for a solenoid valve that can be controlled both electromagnetically and manually to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a solenoid valve with both electromagnetic and manual control, which is not only easy to operate, but also ensures the assembly accuracy between the moving iron and the valve core, improves the synchronization of their movements, and ensures the reliability of the solenoid valve for long-term use.

[0009] To achieve this objective, the present invention adopts the following technical solution: A solenoid valve with both electromagnetic and manual control, comprising: A valve sleeve and a valve core movably disposed within the valve sleeve; An electromagnetic drive mechanism includes a front actuator, a tail actuator, a first moving iron, a second moving iron, and an intermediate push rod. The valve sleeve, the front actuator, and the tail actuator are connected sequentially along the moving direction of the valve core. The front actuator has a first mounting cavity at one end facing the valve sleeve, and the tail actuator has a second mounting cavity at one end facing the front actuator. The first moving iron is movably disposed in the first mounting cavity and is directly connected to the valve core. The first moving iron can be attracted to the front actuator under the action of a first electromagnetic force. The second moving iron is movably disposed in the second mounting cavity and can be attracted to the front actuator under the action of a second electromagnetic force. The intermediate push rod is slidably inserted through the front actuator, and both ends of the intermediate push rod abut against the first moving iron and the second moving iron, respectively. The manual operating mechanism includes a handle and a transmission rod. The handle is threaded to the end of the tailstock away from the valve sleeve. One end of the transmission rod is connected to the handle, and the other end passes through the tailstock and the intermediate push rod in sequence, and is slidably inserted in the first moving iron, and is connected to the first moving iron in a transmission manner.

[0010] As a preferred embodiment of the electromagnetic-manual dual-control electromagnetic valve provided by the present invention, the transmission rod has an end-diameter expansion section formed at one end near the valve core, the first moving iron has a first through hole extending along its axial direction, and a pushing surface facing the valve core is formed on the hole wall of the first through hole. The end-diameter expansion section can limit and abut against the pushing surface, and the distance between the pushing surface and the valve core is greater than the dimension of the end-diameter expansion section along its axial direction.

[0011] As a preferred embodiment of the electromagnetic-manual dual-control electromagnetic valve provided by the present invention, one of the first moving iron and the valve core is provided with a snap-fit ​​groove, and the other is provided with a snap-fit ​​part, wherein the snap-fit ​​part is limited and snapped into the snap-fit ​​groove.

[0012] As a preferred embodiment of the electromagnetic-manual dual-control electromagnetic valve provided by the present invention, the cross-sectional shape of the snap-fit ​​groove is T-shaped, and the shape of the snap-fit ​​part is adapted to the shape of the snap-fit ​​groove.

[0013] As a preferred embodiment of the electromagnetic-manual dual-control solenoid valve provided by the present invention, the electromagnetic-manual dual-control solenoid valve further includes a reset structure, which is installed between the first moving iron and the valve sleeve, and the reset structure is configured to drive the first moving iron and the valve core to reset and remain in the neutral position; And / or, the solenoid valve further includes a second reset member located between the tailstock and the second moving iron, and the second reset member is configured to drive the second moving iron to reset and remain in the neutral position.

[0014] As a preferred embodiment of the electromagnetic-manual dual-control solenoid valve provided by the present invention, the manual operating mechanism further includes a neutral position indicator component, which is configured to provide a position indication when the handle is turned to the neutral position.

[0015] As a preferred embodiment of the electromagnetic-manual dual-control electromagnetic valve provided by the present invention, the center position indicator component includes an elastic element, the outer wall of the handle is provided with a mounting groove, and the inner wall of the tail is provided with a first limiting groove. When the valve core is in the neutral position, the elastic element can be simultaneously accommodated in the mounting groove and the first limiting groove; when the handle is turned, the elastic element can be dislodged from the first limiting groove under the action of the turning force and compressed in the mounting groove.

[0016] As a preferred embodiment of the electromagnetic-manual dual-control electromagnetic valve provided by the present invention, the elastic element is a steel wire retaining ring or an annular sealing ring. Alternatively, the elastic element includes a limiting spring and a limiting part connected together, the limiting spring being installed in the mounting groove in a compressed state, and the limiting part being connected to the end of the limiting spring away from the transmission rod.

[0017] As a preferred embodiment of the electromagnetic-manual dual-control electromagnetic valve provided by the present invention, the outer periphery of the handle is provided with a center position scale line. When the center position scale line is flush with the end face of the tail valve on the side away from the valve sleeve, the handle is turned to the center position.

[0018] As a preferred embodiment of the electromagnetic-manual dual-control electromagnetic valve provided by the present invention, a limit hole is provided on the outer wall of the handle, and a second limit groove is provided on the outer wall of the transmission rod corresponding to the limit hole; The manual operating mechanism also includes a fixing member, which passes through the limiting hole and is partially limited and installed in the second limiting groove.

[0019] The beneficial effects of this invention are: The electromagnetic-manual dual-control solenoid valve provided by this invention: 1) When the first moving iron is attracted to the front worm under the action of the first electromagnetic force, it can drive the valve core to move closer to the front worm, thereby realizing the switching of the valve core from the middle position to the first working position; when the second moving iron is attracted to the front worm under the action of the second electromagnetic force, the second moving iron can push the first moving iron and the valve core to move away from the tail worm through the middle push rod, thereby realizing the switching of the valve core from the middle position to the second working position.

[0020] 2) Compared with the method of connecting the moving iron and the valve core through a connecting rod in related technologies, the direct connection between the first moving iron and the valve core can reduce the assembly gap between the first moving iron and the valve core, improve the synchronization of the movement of the first moving iron and the valve core, and thus ensure the control accuracy of the solenoid valve. On the other hand, it can also eliminate the use of the connecting rod, simplify the assembly process, reduce the assembly difficulty, and reduce the processing cost.

[0021] 3) By setting separate front and tail components, and processing them separately, the processing difficulty can be reduced and the processing efficiency can be improved.

[0022] 4) By connecting the handle to the tailstock via a threaded connection, the threaded structure allows the handle and tailstock to be locked in any position, meeting the requirement of maintaining a reversing state for extended periods in emergency situations. Furthermore, the operator can easily actuate the transmission rod with a simple turning motion, and the hydraulic pressure is absorbed by the threaded structure when the handle is turned, significantly reducing the difficulty of operating the manual mechanism. Since the first moving iron is directly connected to the valve core, the transmission rod can directly push the valve core when moving towards it. The threaded connection between the handle and tailstock allows the operator to smoothly feed and gradually apply force to the transmission rod by turning the handle, preventing the transmission rod from forcefully impacting the valve core. This ensures a smooth and controllable movement of the valve core, preventing damage to the transmission rod and valve core due to hard collisions, thus extending the service life of the solenoid valve and ensuring its long-term reliability.

[0023] 5) By setting the transmission rod through the intermediate push rod, it can also limit the intermediate push rod, so that the first moving iron, the second moving iron and the intermediate push rod are always coaxially set, so as to ensure the smoothness and reliability of the thrust transmission process between the intermediate push rod and the first moving iron and between the intermediate push rod and the second moving iron. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of a solenoid valve provided in related technologies.

[0025] Figure 2 yes Figure 1 A magnified view of a portion at point A.

[0026] Figure 3 This is a cross-sectional schematic diagram of the electromagnetic-manual dual-control electromagnetic valve provided in Embodiment 1 of the present invention.

[0027] Figure 4 yes Figure 1 A partial structural diagram.

[0028] Figure 5 yes Figure 4 A magnified view of a section at point B.

[0029] Figure 6 This is a schematic diagram of the assembly structure of the first moving iron and the valve core provided in Embodiment 1 of the present invention.

[0030] Figure 7 yes Figure 3 A magnified view of a section at point C.

[0031] Figure 8 This is a schematic diagram of the end face structure of the tail provided in Embodiment 1 of the present invention.

[0032] Figure 9 This is a schematic diagram of the structure of the elastic element provided in Embodiment 2 of the present invention.

[0033] In the picture: 1' Handle; 2' First connecting rod; 3' Second connecting rod; 4' Moving iron; 5' Valve core; 6' First elastic element; 7' Second elastic element; 100, Valve sleeve; 1001, Second step surface; 200, Valve core; 210, Snap-fit ​​part; 220, Third step surface; 300. Electromagnetic drive mechanism; 310. Front ferrule; 311. First mounting cavity; 312. First stepped surface; 320. Tail ferrule; 321. Second mounting cavity; 322. Second receiving groove; 323. First through hole; 324. First limiting groove; 330. First moving iron; 331. Snap-fit ​​groove; 332. First through hole; 333. Assembly opening; 334. Pushing surface; 340. Second moving iron; 341. Third receiving groove; 342. Second through hole; 350. Intermediate push rod; 351. Second through hole; 360. Reset structure; 361. First reset component; 362. Limiting component; 3621. First receiving groove; 370. Second reset component; 380. Locking nut; 400. Manual operating mechanism; 410. Handle; 411. Mounting groove; 412. Limiting hole; 420. Transmission rod; 421. Second limiting groove; 422. End expansion section; 430. Center position indicator assembly; 431. Elastic element; 4311. Limiting spring; 4312. Limiting part; 432. Indicator; 440. Fixing element. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] Example 1 Figure 3 A cross-sectional schematic diagram of the electromagnetic-manual dual-control solenoid valve provided in this embodiment is shown. Figure 3 As shown, this embodiment provides a solenoid valve with both electromagnetic and manual control (hereinafter referred to as a solenoid valve). The solenoid valve includes a valve sleeve 100, a valve core 200, and an electromagnetic drive mechanism 300. The valve core 200 is movably disposed in the valve sleeve 100. The electromagnetic drive mechanism 300 is connected to one end of the valve sleeve 100 and is configured to drive the valve core 200 to move relative to the valve sleeve 100 to realize fluid on / off and fluid flow direction control.

[0038] like Figure 3 As shown, the solenoid valve provided in this embodiment is a three-position four-way solenoid valve. That is, as the valve core 200 moves relative to the valve sleeve 100, the valve core 200 can have three valve positions: left (first working position), center position, and right (second working position). It should be noted that the "left" and "right" mentioned in this embodiment do not refer to the spatial meaning of "left" and "right" in the actual application of the solenoid valve; they are only used for reference. Figure 3 The view orientation is merely used to distinguish different features and should not be considered as a limitation on the technical solution of this embodiment.

[0039] It is understandable that the three-position four-way solenoid valve is a relatively mature product in the existing technology. In this embodiment, the specific structure of the valve sleeve 100 and the valve core 200 and the working principle of the valve core 200 switching between various valve positions through their cooperation will not be described in detail.

[0040] Figure 4 It shows Figure 3 A partial structural diagram. (See attached diagram.) Figure 4 and combined Figure 3As shown, to achieve the switching of the solenoid valve between different valve positions, the electromagnetic drive mechanism 300 includes a front actuator 310, a tail actuator 320, a first moving iron 330, a second moving iron 340, and an intermediate push rod 350. The valve sleeve 100, the front actuator 310, and the tail actuator 320 are connected sequentially along the moving direction of the valve core 200. The front actuator 310 has a first mounting cavity 311 at the end facing the valve sleeve 100, and the tail actuator 320 has a second mounting cavity 321 at the end facing the front actuator 310. The first moving iron 330 is movable. The first moving iron 330 is movably disposed in the first mounting cavity 311 and connected to the valve core 200. Under the action of a first electromagnetic force, the first moving iron 330 can be attracted to the front valve 310. The second moving iron 340 is movably disposed in the second mounting cavity 321 and can be attracted to the front valve 310 under the action of a second electromagnetic force. The intermediate push rod 350 is slidably inserted into the front valve 310, and its two ends are connected to or abut against the first moving iron 330 and the second moving iron 340, respectively. By setting separate front and rear valves 310 and 320, which can be processed separately, the processing difficulty can be reduced and the processing efficiency improved.

[0041] When the first moving iron 330 is attracted to the front joist 310 under the action of the first electromagnetic force, it can drive the valve core 200 to move closer to the tail joist 320, thereby realizing the switching of the valve core 200 from the middle position to the first working position; when the second moving iron 340 is attracted to the front joist 310 under the action of the second electromagnetic force, the second moving iron 340 can push the first moving iron 330 and the valve core 200 to move away from the tail joist 320 through the intermediate push rod 350, thereby realizing the switching of the valve core 200 from the middle position to the second working position.

[0042] In this embodiment, the two ends of the intermediate push rod 350 abut against the first moving iron 330 and the second moving iron 340 respectively, omitting the connection between the intermediate push rod 350 and the first moving iron 330, and between the intermediate push rod 350 and the second moving iron 340. This simplifies the assembly process, improves assembly efficiency, and avoids the possibility of poor concentricity due to processing errors after the three are connected, which could cause jamming when the first moving iron 330 or the second moving iron 340 moves. Of course, in other embodiments, designers can also set the intermediate push rod 350 and the first moving iron 330, and the intermediate push rod 350 and the second moving iron 340, as well as the intermediate push rod 350 and the second moving iron 340, as needed for actual processing and assembly. This embodiment does not limit this.

[0043] like Figure 3 and Figure 4As shown, in some embodiments, the front valve 310 is threadedly connected to the tail valve 320, which not only has a simple structure but also a tight connection, facilitating assembly and disassembly. Of course, this embodiment does not limit the connection method between the front valve 310 and the tail valve 320; they can also be connected by plugging, snap-fitting, welding, or other methods. Optionally, a seal is provided between the front valve 310 and the tail valve 320 to ensure a sealed connection and prevent hydraulic oil leakage from the gap between them, thereby ensuring the safe operation of the solenoid valve.

[0044] In some embodiments, the front valve 310 is threaded to the valve sleeve 100, which not only simplifies the structure but also provides a secure connection and facilitates assembly and disassembly. Of course, this embodiment does not limit the connection method between the front valve 310 and the valve sleeve 100; the front valve 310 and the valve sleeve 100 can also be connected by insertion, snap-fit, welding, or other methods. Optionally, a sealing element is also provided between the front valve 310 and the valve sleeve 100 to ensure a sealed connection and prevent hydraulic oil leakage from the gap between the front valve 310 and the valve sleeve 100, thereby ensuring the safe operation of the solenoid valve.

[0045] In some embodiments, the solenoid valve further includes a first coil assembly and a second coil assembly. The first coil assembly is sleeved outside the front nut 310 and is used to provide a first electromagnetic force to the first moving iron 330. The second coil assembly is sleeved outside the tail nut 320 and is used to provide a second electromagnetic force to the second moving iron 340. That is, when the first coil assembly is energized, the first moving iron 330 can be attracted to the front nut 310 to drive the valve core 200 to move closer to the tail nut 320; when the second coil assembly is energized, the second moving iron 340 can be attracted to the front nut 310 to push the first moving iron 330 and the valve core 200 away from the tail nut 320 through the intermediate push rod 350.

[0046] It should be noted that the coil assembly is a relatively mature product in the field of solenoid valves, and the specific structure of the first coil assembly and the second coil assembly will not be described in detail in this embodiment.

[0047] In some embodiments, a magnetically conductive pad is further provided between the first coil assembly and the second coil assembly, and the magnetically conductive pad is sleeved on the front joist 310 or the tail joist 320; a locking nut 380 is provided on the tail joist 320, and the locking nut 380 is located on the side of the second coil assembly away from the first coil assembly. That is, the first coil assembly is pressed between the front joist 310 and the magnetically conductive pad, and the second coil assembly is pressed between the magnetically conductive pad and the locking nut 380. By providing the magnetically conductive pad and the locking nut 380, the axial positioning installation of the first coil assembly and the second coil assembly can be achieved, thereby ensuring the stability of the magnetic circuit and stroke between the two coil assemblies and improving the reliability of the electromagnetic drive.

[0048] Figure 5 It shows Figure 4 A magnified view of a section at point B. Figure 6 A schematic diagram of the assembly structure of the first moving iron 330 and the valve core 200 provided in this embodiment is shown. Figures 5-6 and combined Figure 4 As shown, in this embodiment, the end of the first moving iron 330 that faces away from the tail 320 is directly connected to the valve core 200. This arrangement reduces the assembly gap between the first moving iron 330 and the valve core 200, improving the synchronization of their movements and thus ensuring the control accuracy of the solenoid valve. Furthermore, it eliminates the need for a connecting rod, simplifying the assembly process, reducing assembly difficulty, and lowering processing costs.

[0049] In some embodiments, the first moving iron 330 is provided with a snap-fit ​​groove 331, and the valve core 200 is provided with a snap-fit ​​part 210. The snap-fit ​​part 210 is limited and snapped into the snap-fit ​​groove 331, thereby realizing the axial fixation between the first moving iron 330 and the valve core 200, ensuring that the valve core 200 can move synchronously with the first moving iron 330. Moreover, the first moving iron 330 and the valve core 200 are fixed by snap-fit, which is simple to assemble, reliable to connect, and can eliminate the use of other connecting parts, resulting in high assembly efficiency and low processing cost.

[0050] In some embodiments, the cross-sectional shape of the snap-fit ​​groove 331 is T-shaped, and the shape of the snap-fit ​​portion 210 is adapted to the shape of the snap-fit ​​groove 331. The T-shaped snap-fit ​​groove 331 and the T-shaped snap-fit ​​portion 210 cooperate to further improve the axial fixing effect between the first moving iron 330 and the valve core 200, and prevent the two from separating axially during movement.

[0051] In some embodiments, the side of the first moving iron 330 is provided with an assembly port 333 that communicates with the snap-fit ​​groove 331. The snap-fit ​​part 210 can be inserted into the snap-fit ​​groove 331 in the radial direction of the valve core 200 through the assembly port 333, improving the convenience of the assembly process. In this embodiment, there is one assembly port 333, that is, when processing the snap-fit ​​groove 331, it can penetrate one side wall of the first moving iron 330 in the radial direction, thereby forming an assembly port 333 on the side of the first moving iron 330. In other embodiments, the number of assembly ports 333 can also be set to two, that is, when processing the snap-fit ​​groove 331, it can penetrate both side walls of the first moving iron 330 in the radial direction, thereby forming two symmetrically arranged assembly ports 333 on the side of the first moving iron 330.

[0052] In other embodiments, the snap-fit ​​part 210 can be disposed on the first moving iron 330 and the snap-fit ​​groove 331 can be disposed on the valve core 200, which can also achieve axial fixation between the first moving iron 330 and the valve core 200.

[0053] like Figures 4-5 As shown, the solenoid valve also includes a reset structure 360, which is installed between the first moving iron 330 and the valve sleeve 100. The reset structure 360 ​​is configured to drive the first moving iron 330 and the valve core 200 to reset and remain in the neutral position. By setting the reset structure 360, the first moving iron 330 and the valve core 200 can be automatically reset to the neutral position after the first coil assembly is de-energized, thereby shortening the switching cycle and improving the overall response speed of the solenoid valve.

[0054] Specifically, a first stepped surface 312 is formed on the cavity wall of the first mounting cavity 311, a second stepped surface 1001 is formed on the inner wall of the valve sleeve 100, and a third stepped surface 220 is protruding on the outer wall of the valve core 200. The first stepped surface 312 is positioned towards the valve sleeve 100, and both the second stepped surface 1001 and the third stepped surface 220 are positioned towards the first moving iron 330. The reset structure 360 ​​includes a first reset member 361 and a limiting member 362. The limiting member 362 is sleeved outside the valve core 200 and is slidably disposed in the first mounting cavity 311. When the valve core 200 is in the neutral position, one end of the first reset member 361 simultaneously abuts against the second stepped surface 1001 and the third stepped surface 220, and the other end of the first reset member 361 abuts against the limiting member 362, enabling the limiting member 362 to simultaneously abut against the end face of the first moving iron 330 and the first stepped surface 312.

[0055] When the first coil assembly is energized, the first moving iron 330 attracts the front retainer 310, thereby moving the valve core 200 to the left to the left position. Simultaneously, the valve core 200 compresses the first reset member 361. When the first coil assembly is de-energized, the first moving iron 330 and the valve core 200 reset under the elastic restoring force of the first reset member 361, moving to the right to the center position. When the second coil assembly is energized, the second moving iron 340 attracts the front retainer 310, thereby pushing the first moving iron 330 and the valve core 200 to the right to the right position via the intermediate push rod 350. Simultaneously, the valve core 200 compresses the first reset member 361. When the second coil assembly is de-energized, the first moving iron 330 and the valve core 200 reset under the elastic restoring force of the first reset member 361, moving to the right to the center position, while the intermediate push rod 350 pushes the second moving iron 340 to reset. During this process, due to the setting of the first step surface 312 on the front ferrule 310 and the second step surface 1001 on the valve sleeve 100, the compression of the first reset member 361 can be limited, so that after the first coil assembly or the second coil assembly is de-energized, the first moving iron 330, the second moving iron 340 and the valve core 200 are quickly reset and remain in the neutral position.

[0056] In some embodiments, the first reset member 361 is a spring, which is sleeved outside the valve core 200. The spring assembly process is simple and the processing cost is low. Moreover, the valve core 200 can limit the extension and retraction of the spring to ensure that it can only extend and retract along its own axial direction, ensuring the accuracy of the elastic force transmission of the first reset member 361, and eliminating the radial wobble of the spring, reducing the wear between the valve core 200 and the first reset member 361, and extending the service life of the solenoid valve.

[0057] In some embodiments, the end of the limiting member 362 facing the valve sleeve 100 is provided with a first receiving groove 3621, and the end of the first reset member 361 away from the valve sleeve 100 is partially received in the first receiving groove 3621, so as to realize the positioning installation of the first reset member 361, improve the positioning accuracy, and reduce its space occupied in the axial direction of the valve core 200, making the overall structure of the solenoid valve more compact.

[0058] Understandably, when the valve core 200 is in the left position, if the first coil assembly is de-energized, the first moving iron 330 and the valve core 200 can be reset under the elastic restoring force of the first reset member 361. However, since there is no connecting structure between the intermediate push rod 350 and the second moving iron 340, the second moving iron 340 cannot move to the right synchronously with the first moving iron 330 and the valve core 200. Furthermore, at this time, the distance between the second moving iron 340 and the front joist 310 is at its maximum. When the second coil assembly is energized, the magnetic attraction between the second moving iron 340 and the front joist 310 is at its minimum. Therefore, to avoid the magnetic attraction between the second moving iron 340 and the front joist 310 failing to move the second moving iron 340 to the right when the second coil assembly is energized, such as... Figure 5 As shown, the solenoid valve also includes a second reset member 370, which is located between the tail ferrule 320 and the second moving iron 340, and is configured to drive the second moving iron 340 to reset and remain in the neutral position. Optionally, the second reset member 370 is a spring, which has a simple assembly process and low processing cost.

[0059] It is understandable that, such as Figure 4 As shown, the elastic force of the first reset member 361 is greater than that of the second reset member 370, so that when the valve core 200 is in the neutral position, one end of the first reset member 361 can simultaneously abut against the second step surface 1001 and the third step surface 220, and the limiting member 362 can simultaneously abut against the end face of the first moving iron 330 and the first step surface 312 under the elastic force of the first reset member 361. This prevents the limiting member 362 from failing to abut against the end face of the first moving iron 330 and the first step surface 312 due to excessive elastic force of the second reset member 370, thus affecting the operating accuracy of the solenoid valve.

[0060] In some embodiments, the bottom of the second mounting cavity 321 is provided with a second receiving groove 322, and one end of the second reset member 370 is received in the second receiving groove 322. The second moving iron 340 is provided with a third receiving groove 341, and the other end of the second reset member 370 is received in the third receiving groove 341. The provision of the second receiving groove 322 and the third receiving groove 341 can limit the extension and retraction of the second reset member 370, so as to ensure that it can only extend and retract along its own axial direction, reduce the radial sway of the second reset member 370, and ensure the accuracy of the elastic force transmission of the second reset member 370.

[0061] In some embodiments, a first anti-wear structure is provided between the first moving iron 330 and the cavity wall of the first mounting cavity 311. By providing the first anti-wear structure, the wear between the first moving iron 330 and the front iron 310 when they move relative to each other can be reduced, thereby extending the service life of the solenoid valve. Optionally, the first anti-wear structure can be made of lubricating cloth, which is sleeved on the outer periphery of the first moving iron 330 to reduce wear and ensure the smoothness of the movement of the first moving iron 330. Of course, this embodiment does not limit the specific structure of the first anti-wear structure. Anti-wear structures that can be applied to solenoid valves to reduce the wear between the first moving iron 330 and the front iron 310 when they move relative to each other are all within the protection scope of this embodiment.

[0062] In some embodiments, a second anti-wear structure is provided between the second moving iron 340 and the cavity wall of the second mounting cavity 321. By providing the second anti-wear structure, the wear between the second moving iron 340 and the tail ferrule 320 during movement can be reduced, thereby extending the service life of the solenoid valve. Optionally, the second anti-wear structure can be made of lubricating cloth, which is sleeved on the outer periphery of the second moving iron 340 to reduce wear and ensure the smoothness of the movement of the second moving iron 340. Of course, this embodiment does not limit the specific structure of the second anti-wear structure, and all anti-wear structures in related technologies that can be applied to solenoid valves to reduce the wear between the second moving iron 340 and the tail ferrule 320 during movement are within the protection scope of this embodiment.

[0063] like Figure 3 and Figure 4 As shown, the first moving iron 330 has a first through hole 332 extending through its axial direction, and the second moving iron 340 has a second through hole 342 extending through its axial direction. That is to say, the valve core cavity of the valve core 200, the first mounting cavity 311 of the front servo 310, the gap between the front servo 310 and the intermediate push rod 350, and the second mounting cavity 321 of the tail servo 320 are sequentially connected through the first through hole 332 and the second through hole 342. This design can avoid the phenomenon of pressure buildup when the first moving iron 330 and the second moving iron 340 move, thereby ensuring the smoothness of the valve core 200 of the solenoid valve when switching between valve positions.

[0064] Figure 7 It shows Figure 3 A magnified view of point C. (See attached image.) Figure 7 and combined Figure 3 , Figure 4 As shown, the solenoid valve also includes a manual operating mechanism 400, which includes a handle 410 and a transmission rod 420. The handle 410 is threadedly connected to the end of the tail valve 320 away from the valve sleeve 100. One end of the transmission rod 420 is connected to the handle 410, and the other end passes through the tail valve 320 and the intermediate push rod 350 in sequence, and is slidably inserted in the first moving iron 330 and is connected to the first moving iron 330 in a transmission manner. By threading the handle 410 and the tail valve 320, on the one hand, the threaded structure can lock the handle 410 and the tail valve 320 in any position, thereby meeting the usage requirements of maintaining the reversing state for a long time in emergency situations; on the other hand, the operator can realize the action of the transmission rod 420 by a simple turning action, and when turning the handle 410, the hydraulic pressure is borne by the threaded structure, thereby greatly reducing the operation difficulty of the manual operating mechanism 400. Since the first moving iron 330 is directly connected to the valve core 200, when the transmission rod 420 moves towards the valve core 200, it can directly push the valve core 200. Furthermore, the handle 410 is threadedly connected to the tail 320, allowing the operator to smoothly feed the transmission rod 420 and gradually apply force by turning the handle 410. This avoids the transmission rod 420 from impacting the valve core 200 with a large impact force, thus ensuring that the movement stroke of the valve core 200 is smooth and controllable. This prevents damage to the transmission rod 420 and the valve core 200 due to hard collisions, thereby extending the service life of the solenoid valve and ensuring its long-term reliability.

[0065] Specifically, the tail ferrule 320 has a first through hole 323 extending along its axial direction, and the intermediate push rod 350 has a second through hole 351 extending along its axial direction. The transmission rod 420 is sequentially inserted into the first through hole 323, the second through hole 342 of the second moving iron 340, the second through hole 351, and the first through hole 332 of the first moving iron 330. By inserting the transmission rod 420 through the intermediate push rod 350, it also serves to limit the movement of the intermediate push rod 350, thereby ensuring that the first moving iron 330, the second moving iron 340, and the intermediate push rod 350 remain coaxially aligned, thus ensuring the smoothness and reliability of the thrust transmission process between the intermediate push rod 350 and the first moving iron 330, and between the intermediate push rod 350 and the second moving iron 340.

[0066] like Figure 4 , Figure 5 and Figure 7As shown, the transmission rod 420 has an end-diameter expansion section 422 near the valve core 200. The first moving iron 330 has a first through hole 332 extending along its axial direction. A pushing surface 334 facing the valve core 200 is formed on the wall of the first through hole 332. The end-diameter expansion section 422 can be limited and abutted against the pushing surface 334. The distance between the pushing surface 334 and the valve core 200 is greater than the dimension of the end-diameter expansion section 422 along its axial direction. Specifically, when the valve core 200 is in the neutral position, there is a gap between the left end of the end-diameter expansion section 422 and the pushing surface 334, and a gap between the right end of the end-diameter expansion section 422 and the valve core 200. Under the electromagnetic drive of the electromagnetic drive mechanism 300, when the first coil assembly is energized, the first moving iron 330 can engage with the front joist 310, simultaneously driving the valve core 200 to switch from the center position to the left position. During this process, the gap between the right end of the end expansion section 422 and the valve core 200 provides sufficient space for the relative movement of the valve core 200 and the transmission rod 420. When the second coil assembly is energized, the second moving iron 340 can engage with the front joist 310, thereby pushing the first moving iron 330 and the valve core 200 to the right through the intermediate push rod 350, so that the valve core 200 switches from the center position to the right position. During this process, the gap between the left end of the end expansion section 422 and the pushing surface 334 provides sufficient space for the relative movement of the first moving iron 330 and the transmission rod 420, thereby ensuring that the first moving iron 330 and the valve core 200 can stably switch between valve positions under the electromagnetic drive of the electromagnetic drive mechanism 300 without interfering with the transmission rod 420.

[0067] When manual control is required, the operator can turn the handle 410 to move the transmission rod 420 to the right until it abuts against the valve core 200. At this time, the operator can continue to turn the handle 410 to push the valve core 200 to the right, so that it switches from the center position to the right position. When the operator turns the handle 410 in the opposite direction, it can move the transmission rod 420 to the left until it abuts against the pushing surface 334. At this time, the operator can continue to turn the handle 410 to move the valve core 200 to the left through the first moving iron 330, so that it switches from the center position to the left position.

[0068] like Figure 3 and Figure 7As shown, the manual operating mechanism 400 also includes a neutral position indicator component 430, which is configured to provide a position indication when the handle 410 is turned to the neutral position. By providing the neutral position indicator component 430, a position indication can be provided when the handle 410 is turned to the neutral position, allowing operators to quickly identify the neutral position and effectively improving the accuracy, convenience, and controllability of the solenoid valve during manual adjustment and emergency operation. Furthermore, this design eliminates the need for the elastic structure to switch the valve core 200 from the working position to the neutral position, thus preventing the valve core 200 from failing to accurately reset due to weakened elasticity after prolonged use, ensuring the long-term reliability of the solenoid valve.

[0069] In some embodiments, the neutral position indicator component 430 includes an elastic element 431, a mounting groove 411 is provided on the outer wall of the handle 410, and a first limiting groove 324 is provided on the inner wall of the tailstock 320. When the valve core 200 is in the neutral position, the elastic element 431 can be simultaneously accommodated in the mounting groove 411 and the first limiting groove 324. When the handle 410 is turned, the elastic element 431 can disengage from the first limiting groove 324 under the action of the turning force and be compressed in the mounting groove 411. When the operator turns the handle 410 to switch the valve core 200 from the neutral position to the left or right position, the elastic element 431 can disengage from the first limiting groove 324 under the action of the turning force and be compressed in the mounting groove 411, releasing the limiting effect. At this time, continuing to turn the handle 410 can drive the first moving iron 330 and the valve core 200 to the left or right position via the transmission rod 420. When the operator turns the handle 410 to switch the valve core 200 from the left or right position to the neutral position, the handle 410 can drive the first moving iron 330 and the valve core 200 to move via the transmission rod 420 until the mounting groove 411 and the first limiting groove 324 are aligned. At this point, the elastic element 431 extends into the first limiting groove 324 under its own elastic restoring force, forming an axial limit between the handle 410 and the tail ferrule 320. In this situation, the operator can increase the turning force of the handle 410, thus providing a neutral position indication. Furthermore, when the valve core 200 is in the neutral position, the elastic element 431 can also form an axial limit between the handle 410 and the tail ferrule 320, preventing accidental operation of the handle 410 and further ensuring the safety of the solenoid valve.

[0070] In some embodiments, the elastic element 431 is a steel wire retaining ring. On the one hand, the steel wire retaining ring has good elasticity and fatigue resistance, and can rebound stably after being compressed, thereby ensuring the accuracy of the center position indication and the reliability of the limit; on the other hand, the steel wire retaining ring is small in size, easy to install, and has low operating costs.

[0071] In some embodiments, the elastic element 431 is an annular sealing ring. The annular sealing ring not only realizes the function of center position indication and axial limiting between the handle 410 and the tail 320, but also ensures good sealing between the handle 410 and the tail 320. It has multiple uses, simplifies the assembly process, improves assembly efficiency, and reduces processing costs.

[0072] In some embodiments, a center position scale line is provided on the outer periphery of the handle 410. When the center position scale line is flush with the end face of the tail 320 on the side opposite to the valve sleeve 100, the handle 410 is turned to the center position. The center position scale line provides a more intuitive indication for the operator, preventing the handle 410 from being over-tightened due to the operator's insensitivity to the tightening force, which would affect the accuracy of the operation of the manual operating mechanism 400.

[0073] Figure 8 A schematic diagram of the end face structure of the tail 320 provided in this embodiment is shown. Figure 8 and combined Figure 7 As shown, the neutral position indicator assembly 430 also includes an indicator 432, which is located at the end of the tail 320 opposite to the valve sleeve 100. When the handle 410 is turned until the indicator 432 is aligned with the neutral position scale line, the valve core 200 is in the neutral position. The indicator 432 and the neutral position scale line work together to provide multi-directional indication for the operator, further improving the accuracy of the manual operating mechanism 400.

[0074] In some embodiments, the indicator 432 can be a coating shaped like an arrow, which has a simple structure and is easy to set up.

[0075] In some embodiments, the center scale line is an annular coating disposed on the outer periphery of the handle 410; there are multiple indicators 432, and each indicator 432 is disposed at intervals along the circumference of the tail 320 so that the operator can observe from any position.

[0076] like Figure 7 As shown, a limiting hole 412 is provided on the outer wall of the handle 410, and a second limiting groove 421 is provided on the outer wall of the transmission rod 420 corresponding to the limiting hole 412. The manual operating mechanism 400 also includes a fixing member 440, which passes through the limiting hole 412 and is partially limited and installed in the second limiting groove 421. By setting the fixing member 440, the handle 410 and the transmission rod 420 can be fixedly connected, so that when the handle 410 rotates, it drives the transmission rod 420 to rotate synchronously, thus achieving synchronicity of movement between the handle 410 and the transmission rod 420.

[0077] In some embodiments, the fastener 440 is a plug, which is threaded into the limiting hole 412 to further improve the stability of the connection between the fastener 440 and the handle 410. The plug is also easy to obtain and assemble, which can reduce processing costs.

[0078] In some embodiments, the second limiting groove 421 is an annular groove. This design allows the fixing member 440 to be smoothly inserted into the second limiting groove 421 at any angle along the circumference of the transmission rod 420, reducing the assembly difficulty between the handle 410 and the transmission rod 420. On the other hand, the annular second limiting groove 421 can accommodate a slight relative sliding between the handle 410 and the transmission rod 420, preventing the smooth movement of the transmission rod 420 from being affected by the binding between the handle 410 and the transmission rod 420 when the handle 410 is rotated. It also reduces the risk of the transmission rod 420 being broken and extends the service life of the solenoid valve.

[0079] Example 2 This embodiment provides a solenoid valve with both electromagnetic and manual control (hereinafter referred to as solenoid valve). The specific structure of this solenoid valve is roughly the same as that of the solenoid valve provided in Embodiment 1, except that the structure of the elastic element 431 is different.

[0080] Figure 9 A schematic diagram of the structure of the elastic element 431 provided in this embodiment is shown. Figure 9 and combined Figure 7 As shown, the elastic element 431 includes a limiting spring 4311 and a limiting part 4312 connected together. The limiting spring 4311 is installed in the mounting groove 411 in a compressed state, and the end of the limiting spring 4311 away from the transmission rod 420 is connected to the limiting part 4312. When the operator turns the handle 410 to switch the valve core 200 from the middle position to the left or right position, the limiting part 4312 can be disengaged from the first limiting groove 324 under the action of the turning force and is completely accommodated in the mounting groove 411. At the same time, the limiting spring 4311 is compressed, and the limiting effect is released. At this time, if the handle 410 is turned again, the first moving iron 300 and the valve core 200 can be moved to the left or right position through the transmission rod 420. When the operator turns the handle 410 to switch the valve core 200 from the left or right position to the center position, the handle 410 can drive the first moving iron 300 and the valve core 200 to move via the transmission rod 420 until the mounting groove 411 and the first limiting groove 324 are aligned. At this point, the limiting part 4312 can extend into the first limiting groove 324 under the elastic restoring force of the limiting spring 4311, forming an axial limit between the handle 410 and the tail 320. In this case, the operator can continue to turn the handle 410 with increasing turning force, thereby providing the operator with a center position indication.

[0081] In some embodiments, the limiting part 4312 has a spherical structure. This arrangement converts the sliding friction between the elastic element 431 and the tail 320 into rolling friction between the spherical limiting part 4312 and the inner wall of the tail 320, thereby reducing friction between the elastic element 431 and the tail 320, reducing wear, and improving the smoothness of relative movement between the handle 410 and the tail 320. Furthermore, the spherical structure of the limiting part 4312 provides guidance for its disengagement from the first limiting groove 324, further improving the ease of operation of the manual operating mechanism 400. Optionally, the limiting part 4312 can be made directly of a steel ball, which is simple in structure, easy to install, and allows for mass production.

[0082] In some embodiments, the first limiting groove 324 is an annular groove. This design allows the limiting part 4312 to be smoothly inserted into the first limiting groove 324 at any angle along the circumference of the tail 320. This not only reduces the assembly difficulty between the manual operating mechanism 400 and the tail 320, but also ensures that the limiting part 4312 can smoothly spring into the first limiting groove 324 when in the neutral position, thus ensuring the reliability of the neutral position indication function.

[0083] In some embodiments, the number of elastic elements 431 is at least two, with each elastic element 431 spaced apart circumferentially along the transmission rod 420. This design allows for more balanced circumferential force distribution between the tailstock 320 and the handle 410, resulting in a clearer feel for the positioning indicator, while also improving overall structural stability and operational reliability. In this embodiment, the number of elastic elements 431 is two, symmetrically arranged, to reduce the number of elastic elements 431 while maintaining overall structural stability and operational reliability, thereby improving assembly efficiency and reducing processing costs. Of course, in other embodiments, the number of elastic elements 431 can also be three, four, etc., and designers can adaptively adjust the number of elastic elements 431 according to actual usage requirements.

[0084] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A solenoid valve with both electromagnetic and manual control, characterized in that, include: Valve sleeve (100) and valve core (200) movably disposed in the valve sleeve (100); The electromagnetic drive mechanism (300) includes a front actuator (310), a tail actuator (320), a first moving iron (330), a second moving iron (340), and an intermediate push rod (350). The valve sleeve (100), the front actuator (310), and the tail actuator (320) are connected sequentially along the moving direction of the valve core (200). The front actuator (310) has a first mounting cavity (311) at one end facing the valve sleeve (100), and the tail actuator (320) has a second mounting cavity (321) at one end facing the front actuator (310). The first moving iron (330) is movably mounted in the first moving iron (340). In a mounting cavity (311), and directly connected to the valve core (200), the first moving iron (330) can be attracted to the front valve (310) under the action of the first electromagnetic force; the second moving iron (340) is movably disposed in the second mounting cavity (321), and the second moving iron (340) can be attracted to the front valve (310) under the action of the second electromagnetic force; the intermediate push rod (350) is slidably inserted into the front valve (310), and the two ends of the intermediate push rod (350) abut against the first moving iron (330) and the second moving iron (340) respectively; The manual operating mechanism (400) includes a handle (410) and a transmission rod (420). The handle (410) is threaded to the end of the tailstock (320) away from the valve sleeve (100). One end of the transmission rod (420) is connected to the handle (410), and the other end passes through the tailstock (320) and the intermediate push rod (350) in sequence, and is slidably inserted in the first moving iron (330), and is connected to the first moving iron (330) in a transmission connection.

2. The electromagnetic-manual dual-control solenoid valve according to claim 1, characterized in that, The transmission rod (420) has an end-diameter expansion section (422) near the valve core (200). The first moving iron (330) has a first through hole (332) extending along its axial direction. A pushing surface (334) facing the valve core (200) is formed on the hole wall of the first through hole (332). The end-diameter expansion section (422) can be limited and resisted by the pushing surface (334). The distance between the pushing surface (334) and the valve core (200) is greater than the size of the end-diameter expansion section (422) along its axial direction.

3. The electromagnetic-manual dual-control solenoid valve according to claim 1, characterized in that, One of the first moving iron (330) and the valve core (200) has a snap-fit ​​groove (331) and the other has a snap-fit ​​part (210), which is limited and snapped into the snap-fit ​​groove (331).

4. The electromagnetic-manual dual-control solenoid valve according to claim 3, characterized in that, The cross-sectional shape of the snap-fit ​​groove (331) is T-shaped, and the shape of the snap-fit ​​part (210) is adapted to the shape of the snap-fit ​​groove (331).

5. The electromagnetic-manual dual-control solenoid valve according to claim 1, characterized in that, The electromagnetic-manual dual-control solenoid valve also includes a reset structure (360), which is installed between the first moving iron (330) and the valve sleeve (100), and the reset structure (360) is configured to drive the first moving iron (330) and the valve core (200) to reset and remain in the neutral position; And / or, the solenoid valve further includes a second reset member (370) located between the tailstock (320) and the second moving iron (340), and the second reset member (370) is configured to drive the second moving iron (340) to reset and remain in the neutral position.

6. The electromagnetic-manual dual-control solenoid valve according to any one of claims 1 to 5, characterized in that, The manual operating mechanism (400) also includes a center position indicator (430) configured to provide a position indication when the handle (410) is turned to the center position.

7. The electromagnetic-manual dual-control solenoid valve according to claim 6, characterized in that, The center position indicator component (430) includes an elastic element (431), the outer wall of the handle (410) is provided with a mounting groove (411), and the inner wall of the tail (320) is provided with a first limiting groove (324). When the valve core (200) is in the neutral position, the elastic element (431) can be simultaneously accommodated in the mounting groove (411) and the first limiting groove (324); when the handle (410) is screwed, the elastic element (431) can be dislodged from the first limiting groove (324) under the action of the screwing force and compressed in the mounting groove (411).

8. The electromagnetic-manual dual-control solenoid valve according to claim 7, characterized in that, The elastic element (431) is a wire retaining ring or an annular sealing ring; Alternatively, the elastic element (431) includes a limiting spring (4311) and a limiting part (4312) connected together. The limiting spring (4311) is installed in the mounting groove (411) in a compressed state, and the limiting part (4312) is connected to one end of the limiting spring (4311) away from the transmission rod (420).

9. The electromagnetic-manual dual-control solenoid valve according to claim 6, characterized in that, The handle (410) is provided with a center scale line on its outer periphery. When the center scale line is flush with the end face of the tail (320) on the side away from the valve sleeve (100), the handle (410) is screwed to the center position.

10. The electromagnetic-manual dual-control solenoid valve according to any one of claims 1 to 5, characterized in that, The outer wall of the handle (410) is provided with a limiting hole (412), and the outer wall of the transmission rod (420) is provided with a second limiting groove (421) corresponding to the limiting hole (412). The manual operating mechanism (400) also includes a fixing member (440), which passes through the limiting hole (412) and is partially limited and installed in the second limiting groove (421).

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