A rotary reversing valve for a work machine and a work machine

Abstract

This application belongs to the field of valve control device technology and provides a rotary directional valve for operating machinery and the operating machinery itself. The rotary directional valve includes a valve body, a valve core, and an end-sealing assembly. The valve body has a valve cavity working channel and a working port communicating with the valve cavity working channel. The valve core is rotatably disposed within the valve cavity working channel and is used to control the on / off state of the working port. The two opposite ends of the valve core are a rotary drive end and a limiting end, respectively. The limiting end is located within the valve cavity working channel, and a stepped fit is formed between the limiting end and the peripheral wall of the valve cavity working channel. The stepped fit restricts the axial movement of the valve core towards the rotary drive end. The end-sealing assembly seals the end of the valve cavity working channel near the limiting end. In this rotary directional valve, the axial limiting position of the valve core is completely integrated inside the valve cavity working channel, preventing the infiltration of corrosive media.

Description

Technical Field

[0001] This application belongs to the field of valve control device technology, specifically relating to a rotary directional valve for operating machinery and the operating machinery itself. Background Technology

[0002] In agricultural machinery, construction machinery, and other operating equipment, manual operation is preferred for some actuators. Rotary valves are widely used in manually operated valves due to their compact structure, intuitive operation, and low cost. Their working principle is as follows: the valve core is manually driven to rotate, thereby achieving the reversing control of the hydraulic oil circuit.

[0003] Currently, these types of manual rotary valves generally employ an axial limiting structure at both ends. Specifically, the valve core is installed inside the valve body, with both ends protruding from the valve body. It forms an axial limiting fit with the valve body end face through snap rings, ensuring that the valve stem rotates only around its axis during operation and does not experience axial movement.

[0004] In practical use, the parts at both ends of the valve core where the retaining rings are installed are usually equipped with a surface protective layer (such as a plating or coating). However, under long-term reciprocating rotation, continuous relative friction occurs between the retaining rings and the valve core, causing the protective layer to gradually wear and peel off. Simultaneously, the machinery often operates in harsh environments such as fields and paddy fields, directly exposing the valve body ends and retaining ring areas to corrosive media such as mud, water, and sand. With prolonged use, mud, sand, and corrosion easily accumulate at the fit between the retaining rings and the valve core.

[0005] Application content In view of the above-mentioned defects or deficiencies, this application provides a rotary directional valve for operating machinery and the operating machinery, aiming to solve the technical problem that the valve core of the existing rotary directional valve is prone to rust and foreign matter accumulation.

[0006] To achieve the above objectives, this application provides a rotary directional valve for operating machinery. The rotary directional valve includes a valve body, a valve core, and an end-sealing assembly. The valve body has a valve cavity working channel and a working oil port communicating with the valve cavity working channel. The valve core is rotatably disposed in the valve cavity working channel and is used to control the opening and closing of the working oil port. The two opposite ends of the valve core are a rotary drive end and a limiting end, respectively. The limiting end is located in the valve cavity working channel, and a stepped fit is formed between the limiting end and the peripheral wall of the valve cavity working channel. The stepped fit is used to restrict the axial movement of the valve core toward the rotary drive end. The end-sealing assembly seals the end of the valve cavity working channel near the limiting end.

[0007] In this embodiment, a first step is formed on the peripheral wall of the working channel of the valve cavity, and the side of the first step without side is closer to the end sealing component than the side with side; a second step is provided on the limiting end, and the side of the second step without side is closer to the rotary drive end than the side with side, and the second step is used to cooperate with the first step for limiting.

[0008] In this embodiment, when the second step and the first step are engaged and abutted, an axial gap is left between the end sealing component and the end of the limiting end.

[0009] In this embodiment, the end sealing assembly includes a plug body and a plug sealing ring. The plug body is sealed at one end of the valve cavity working channel near the limiting end, and the plug sealing ring is disposed between the plug body and the peripheral wall of the valve cavity working channel.

[0010] In this embodiment, the rotary drive end extends out of the working channel of the valve cavity, and the rotary reversing valve also includes an end sealing assembly, which is used to seal the port area of ​​the working channel of the valve cavity near the rotary drive end.

[0011] In this embodiment, the end sealing assembly includes an end sealing ring disposed between the peripheral wall of the working channel of the valve cavity near the rotary drive end and the valve core.

[0012] In this embodiment, the end sealing assembly includes a sealing end cap, which is located at a port in the working channel of the valve cavity near the rotary drive end. One end of the sealing end cap extends from the port into the gap between the peripheral wall of the working channel of the valve cavity and the valve core. The rotary drive end extends out of the working channel of the valve cavity and passes through the sealing end cap.

[0013] In this embodiment, the end sealing assembly includes a rubber sealing sleeve, which seals the port of the valve cavity working channel near the rotary drive end. The rotary drive end extends from the valve cavity working channel and passes through the rubber sealing sleeve.

[0014] In this embodiment, the rotary drive end extends from the working channel of the valve cavity and is provided with an operating handle for manually operating the rotation of the valve core. The valve body is also provided with a limiting structure for limiting the extreme rotation control position of the operating handle.

[0015] To achieve the above objectives, this application also provides a working machine, wherein the working machine includes a rotary reversing valve according to the above description for the working machine.

[0016] Through the above technical solution, the rotary reversing valve for operating machinery provided in this application embodiment has the following beneficial effects: Compared to existing technologies that use snap rings for limiting the valve core's position at the exposed end, this rotary directional valve effectively decouples the limiting and sealing structures. The limiting structure is fully integrated within the valve cavity's working channel and, together with the end-sealing assembly, forms a closed space. In this structure, the limiting end of the valve core does not need to cooperate with sealing rings or other sealing structures, avoiding additional frictional resistance caused by seal compression. This effectively reduces the valve core's rotational resistance while achieving reliable axial limiting. Furthermore, with the limiting structure concentrated at the valve core's limiting end, the rotary drive end no longer bears the axial limiting function, achieving separation of the limiting and rotary drive functions. The rotary drive end can therefore employ a simpler and more reliable sealing method, significantly improving the seal's durability and reliability while ensuring low-resistance rotation of the valve core. By integrating limiting and sealing functions at the same end, this structure effectively balances protection performance in harsh environments and operational flexibility while maintaining a compact layout.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the rotary reversing valve in the embodiment of this application when the end sealing component is an end sealing ring and its working oil port is in the open state. Figure 2 yes Figure 1 Enlarged structural diagram at point A; Figure 3 yes Figure 1 Enlarged structural diagram at point B; Figure 4 This is a schematic diagram of the structure of the rotary reversing valve in the embodiment of this application when the end sealing component is an end sealing ring and its working oil port is in the closed state. Figure 5 This is a schematic diagram of the structure of the rotary reversing valve in the embodiments of this application when the end sealing assembly is a sealing end cap and its working oil port is in the closed state. Figure 6 This is a schematic diagram of the structure of the rotary reversing valve in the embodiments of this application when the end sealing component is a rubber sealing sleeve and its working oil port is in the closed state.

[0019] Explanation of reference numerals in the attached figures 1. Valve body; 1a. Working port; 11. First step; 2. Valve core; 21. Second step; 3. End sealing assembly; 31. Plug body; 32. Plug sealing ring; 4. End sealing assembly; 41. End sealing ring; 42. Sealing end cap; 43. Rubber sealing sleeve; 51. Operating handle; 52. Limiting structure. Detailed Implementation

[0020] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this application.

[0021] The rotary reversing valve for operating machinery of this application is described below with reference to the accompanying drawings.

[0022] For machinery that is exposed to harsh environments such as mud, water, and sand for extended periods, the rotary valves on these machines have significant reliability shortcomings.

[0023] Taking the manual lifting and locking control valve of a rice transplanter as an example, to ensure low-resistance rotation of the valve core, sealing rings should generally be avoided at the valve core's limiting point. To prevent foreign object intrusion, existing technology typically applies a protective layer to the limiting area at the valve core's end. During frequent rotation, the protective layer at the locations where the retaining rings are installed on both ends of the valve core is damaged due to continuous friction. Furthermore, field operations often involve splashing mud and water, and the intrusion of mud and sand, making the retaining ring's fit gaps prone to corrosion and foreign object accumulation. With accumulated use, this problem intensifies, leading to a significant increase in valve core rotation resistance and even jamming.

[0024] If the valve core becomes difficult to rotate due to rust or foreign objects, the operator will find it difficult to accurately control the height and timing of the transplanting platform. This will not only affect the consistency of the transplanting depth, but may also cause operational delays or malfunctions in scenarios that require frequent raising and lowering, such as turning or crossing ridges, seriously interfering with the work rhythm and quality.

[0025] To address the aforementioned problems, this application provides a rotary directional valve for operating machinery, such as... Figure 1 and Figure 4 As shown, the rotary reversing valve includes a valve body 1, a valve core 2, and an end sealing assembly 3.

[0026] The valve body 1 has a working channel inside the valve cavity, and the valve body 1 has a working oil port 1a that is connected to the working channel of the valve cavity. The working oil port 1a includes an oil inlet, an oil return port, and an actuator connection port.

[0027] The valve core 2 is rotatably disposed within the working channel of the valve cavity, and its outer peripheral wall is provided with an oil groove or flow hole corresponding to the working oil port 1a. The two opposite ends of the valve core 2 are the rotary drive end and the limiting end, respectively. When the valve core 2 rotates around the axis under the action of the external force of the rotary drive end, the oil groove or flow hole rotates synchronously with the valve core 2, thereby selectively connecting or disconnecting different working oil ports 1a, realizing the control of the hydraulic oil circuit reversing state.

[0028] The limiting end of the valve core 2 is located in the working channel of the valve cavity, and a stepped fit is formed between the limiting end and the peripheral wall of the working channel of the valve cavity. The stepped fit is used to restrict the axial movement of the valve core 2 toward the rotation drive end. The end sealing component 3 is sealed at one end of the working channel of the valve cavity near the limiting end.

[0029] The rotary directional valve provided in this application achieves axial limiting of the valve core 2 through a stepped fit and the inner end face of the end sealing assembly 3. The stepped fit restricts the axial movement of the valve core 2 towards the rotary drive end, while the inner end face of the end sealing assembly 3 restricts the axial movement of the valve core 2 towards the limiting end. Together, they achieve complete axial limiting of the valve core 2 in both directions.

[0030] Compared to existing technologies that use snap rings for limiting the valve core's position at the exposed end, this rotary directional valve effectively decouples the limiting and sealing structures. The limiting structure is fully integrated within the valve cavity's working channel and, together with the end-sealing assembly, forms a closed space. In this structure, the limiting end of the valve core does not need to cooperate with sealing rings or other sealing structures, avoiding additional frictional resistance caused by seal compression. This effectively reduces the valve core's rotational resistance while achieving reliable axial limiting. Furthermore, with the limiting structure concentrated at the valve core's limiting end, the rotary drive end no longer bears the axial limiting function, achieving separation of the limiting and rotary drive functions. The rotary drive end can therefore employ a simpler and more reliable sealing method, significantly improving the seal's durability and reliability while ensuring low-resistance rotation of the valve core. By integrating limiting and sealing functions at the same end, this structure effectively balances protection performance in harsh environments and operational flexibility while maintaining a compact layout.

[0031] like Figure 1 and Figure 2 As shown, in this embodiment, a first step 11 is formed on the peripheral wall of the working channel of the valve cavity, and a second step 21 is provided on the limiting end of the valve core 2. The sideless side of the first step 11 faces the end sealing assembly 3, and the sideless side of the second step 21 faces the rotary drive end. The second step 21 cooperates with the first step 11 to form the aforementioned stepped cooperation structure. When the valve core 2 is subjected to external force and moves axially towards the rotary drive end, the side of the second step 21 abuts and limits the movement of the valve core 2 in that direction, thereby preventing the valve core 2 from continuing to move in that direction.

[0032] like Figure 1 and Figure 2 As shown, in this embodiment, when the second step 21 and the first step 11 cooperate to abut against each other to achieve axial limiting, the end of the limiting end and the end sealing component 3 always maintain a certain axial gap, and the two do not contact each other.

[0033] The gap design allows the valve core 2 to move slightly in the axial direction, preventing the valve core 2 from being blocked by the end sealing component 3 and causing jamming. At the same time, the fact that the end face of the limiting end does not contact the end sealing component 3 can also avoid wear problems caused by friction between the valve core 2 and the end sealing component 3.

[0034] like Figure 1 and Figure 2 As shown, in this embodiment, the end sealing assembly 3 includes a plug body 31 and a plug sealing ring 32. The plug body 31 is plugged at one end of the valve cavity working channel near the limiting end to form a closure of the valve cavity; the plug sealing ring 32 is disposed between the plug body 31 and the peripheral wall of the valve cavity working channel to achieve a static seal between the two.

[0035] The plug sealing ring 32 forms a stable and effective sealing interface between the plug body 31 and the valve cavity peripheral wall, preventing hydraulic medium from leaking from the end of the valve cavity and blocking external contaminants such as mud and sand from invading the valve cavity. The plug body 31 and the sealing ring are separate units, facilitating installation and replacement and reducing assembly difficulty and maintenance costs. Furthermore, the plug body 31 is used to axially limit the end face of the valve core 2, while the plug sealing ring 32 only performs a static sealing function and does not participate in the dynamic contact during the rotation of the valve core 2, thus avoiding failure caused by seal wear.

[0036] like Figure 1 and Figure 3 As shown, in this embodiment, the rotary drive end of the valve core 2 extends out of the valve cavity working channel to connect with the external operating handle 51 or the drive mechanism. The rotary reversing valve also includes an end sealing assembly 4, which is disposed in the port area of ​​the valve cavity working channel near the rotary drive end, for sealing the port.

[0037] Since the axial limiting structure 52 (stepped fit) is fully integrated into the limiting end of the valve core 2, the rotary drive end no longer undertakes the limiting function. Therefore, there is no need to install limiting elements such as snap rings at this port. The end sealing assembly 4 can independently and focus on the sealing function, avoiding mutual interference between the limiting structure 52 and the sealing structure. Furthermore, since the rotary drive end does not need to consider the installation space of the limiting element, a more mature and efficient dynamic sealing form can be adopted. Moreover, since the end sealing assembly 4 only undertakes the sealing function and does not participate in axial limiting, it avoids the abnormal wear caused by the seals bearing axial force or friction with the limiting elements in traditional structures. This makes the valve core 2 rotate more smoothly and easily, and provides a better operating feel.

[0038] There are many specific structural forms of the end sealing assembly 4, such as Figure 1 and Figure 4 As shown, in one embodiment, the end sealing assembly 4 may include an end sealing ring 41 disposed between the peripheral wall of the working channel of the valve cavity near the rotary drive end and the valve core 2.

[0039] The end seal ring 41 is directly installed between the valve cavity peripheral wall and the valve core 2, featuring a simple and compact structure and convenient assembly. Since the axial limiting function is independently handled by the stepped end of the limiting device, the rotary drive end does not require limiting elements such as snap rings. The end seal ring 41 can focus on dynamic sealing, avoiding the interference between the sealing and limiting components in traditional structures. This seal ring effectively prevents external mud, water, and sand from entering the valve cavity through the gap between the rotary drive end and the valve body 1, while also preventing hydraulic medium leakage. It achieves the design goals of low cost and easy maintenance while ensuring sealing reliability.

[0040] For example Figure 5 As shown, in another form, the end sealing assembly 4 includes a sealing end cap 42. The sealing end cap 42 is located at a port in the valve cavity working channel near the rotary drive end, and one end of the sealing end cap 42 extends from the port into the gap between the peripheral wall of the valve cavity working channel and the valve core 2. The rotary drive end extends from the valve cavity working channel and passes through the sealing end cap 42.

[0041] The sealing end cap 42 adopts an extended structure. Its extended portion forms an annular gap channel between the valve cavity peripheral wall and the valve core 2, increasing the path length and tortuosity of external media intrusion, creating a labyrinth effect, thereby significantly improving the sealing protection capability. Simultaneously, the sealing end cap 42 forms an end face fit with the valve body 1 at the port, further preventing mud and water splashes from directly impacting the sealing interface. This structure integrates sealing and guiding functions, and the extended portion also provides auxiliary support for the rotation of the valve core 2, enhancing the stability of the valve core 2's operation. Compared to relying solely on a sealing ring, the sealing end cap 42 structure exhibits superior durability and reliability under extreme conditions such as high humidity and mud.

[0042] For example Figure 6 As shown, in another embodiment, the end sealing assembly 4 includes a rubber sealing sleeve 43 that seals the port of the valve cavity working channel near the rotary drive end, the rotary drive end extending from the valve cavity working channel and penetrating the rubber sealing sleeve 43.

[0043] The rubber sealing sleeve 43 adopts an integral wrapping structure, covering the protruding part of the valve core and simultaneously connecting to the port of the valve cavity working channel to form a seal. The rubber material has good elasticity and deformation adaptability, maintaining continuous and uniform contact pressure during the rotation of the valve core 2, achieving a reliable dynamic seal. This structure also has self-compensating characteristics; even after long-term use and slight wear, the rubber's elasticity can still maintain the sealing effect. Furthermore, the rubber sealing sleeve 43 can be designed as a one-piece structure, simplifying installation and reducing the precision requirements for the fit between the valve body 1 and the valve core 2, thus reducing manufacturing costs. In operating environments with severe mud and water splashing or high sediment content, this structure effectively prevents external contaminants from entering the valve cavity, ensuring the long-term stable operation of the valve core 2.

[0044] It is understandable that, in specific arrangements, the above three sealing forms can be combined according to specific needs. For example, under the premise of using the sealing end cap 42, an end sealing ring 41 can be further set between the valve cavity peripheral wall and the valve core 2.

[0045] like Figure 1 As shown, in this embodiment, the rotary drive end extends out of the working channel of the valve cavity and is equipped with an operating handle. The operator can manually drive the operating handle to rotate the valve core 2, thereby realizing the oil circuit reversal control. The operation is intuitive and convenient. The valve body 1 is also provided with a limiting structure 52, which is used to limit the extreme rotation position of the operating handle, thereby clarifying the maximum rotation angle of the valve core 2. This ensures that the valve core 2 accurately switches between various working states (such as the rising, falling, and neutral locking of the actuator), preventing the valve core 2 from being misaligned or damaged due to excessive rotation.

[0046] To achieve the above objectives, this application also provides a working machine, wherein the working machine includes a rotary reversing valve according to the above description for the working machine.

[0047] The working principle of the rotary reversing valve in this embodiment will be explained below in conjunction with the lifting and locking control process of the rice transplanter.

[0048] When a rice transplanter is operating in the field, the lifting and lowering control of the transplanter is typically achieved through the coordinated operation of a lifting control valve and a locking control valve. The lifting control valve controls the rapid and fine-tuning of the transplanting platform to meet the frequent adjustment needs during transplanting. The locking control valve, located between the lifting control valve and the lifting cylinder, is used to safely lock the transplanting platform in the raised position for extended periods (such as during equipment maintenance, field relocation, or prolonged shutdown), preventing accidental descent due to hydraulic system leaks or misoperation. The locking control valve has both open and closed positions. While primarily operated manually, its operation frequency is less than that of the lifting control valve, but the reliability of its locking state directly impacts equipment and personnel safety.

[0049] Considering that the lock-up control valve is exposed to harsh working conditions such as paddy fields and muddy fields for a long time, and the working interval is often long, if a rotary valve with a traditional snap ring limit structure is used, mud and water will easily accumulate and corrode at both ends of the valve core, causing the operating handle of the lock-up control valve to jam and unable to rotate normally when it needs to be unlocked, thus affecting the safe operation during equipment maintenance or relocation.

[0050] Therefore, the locking control valve can adopt the rotary control valve structure shown in this embodiment. Its axial limiting structure 52 (stepped fit) is fully integrated inside the working channel of the valve cavity, and the limiting in both directions is located on one side of the limiting end of the valve core 2, avoiding the limiting part from being exposed to the external mud and water environment. The end sealing assembly 3 forms a seal at the end of the valve cavity, and the end sealing assembly 4 of the rotary drive end independently undertakes the dynamic sealing function, effectively preventing mud, water, and sediment from entering the valve cavity.

[0051] In practical use, when the rice transplanter finishes its work or needs maintenance, the operator manually operates the locking control valve handle to raise the transplanting platform to the lifted position and switch to the locked state. Since the axial limit of the valve core 2 is reliably supported by the built-in stepped platform, and the limiting structure 52 is not exposed to the external environment, even if mud and water adhere to it and are not cleaned in time, the valve core 2 can still rotate flexibly. The operating handle is easy to operate and has a clear stroke, ensuring that the locking control valve can reliably enter the locked state and smoothly reset when unlocking is required.

[0052] By configuring the lock-up control valve as the rotary control valve structure of this embodiment, the intuitiveness requirement of manual operation is met, and the problem of reduced sensitivity of manual lock-up operation caused by mud and water accumulation and rust jamming is solved from the structural root, which significantly improves the safety, maintenance convenience and long-term reliability of the rice transplanter under harsh working conditions.

[0053] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In the description of this specification, the references to terms such as "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 this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, 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.

[0056] Although embodiments of this application have been described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A rotary directional valve for use in machinery, characterized in that, The rotary reversing valve for the operating machinery includes: The valve body (1) is provided with a valve cavity working channel and a working oil port (1a) communicating with the valve cavity working channel; The valve core (2) is rotatably disposed in the working channel of the valve cavity and is used to control the opening and closing of the working oil port (1a). The two opposite ends of the valve core (2) are a rotary drive end and a limiting end, respectively. The limiting end is located in the working channel of the valve cavity and forms a stepped engagement with the peripheral wall of the working channel of the valve cavity. The stepped engagement is used to restrict the axial movement of the valve core (2) toward the rotary drive end. End sealing assembly (3) is used to seal one end of the working channel of the valve cavity near the limiting end.

2. The rotary reversing valve for working machinery according to claim 1, characterized in that, A first step (11) is formed on the peripheral wall of the working channel of the valve cavity, and the side without side of the first step (11) is closer to the end sealing assembly (3) than the side with side. The limiting end is provided with a second step (21), and the side without the side of the second step (21) is closer to the rotary drive end than the side with the side. The second step (21) is used to limit and cooperate with the first step (11).

3. The rotary reversing valve for operating machinery according to claim 2, characterized in that, When the second step (21) and the first step (11) are engaged and abut against each other, there is an axial gap between the end sealing component (3) and the end of the limiting end.

4. The rotary reversing valve for operating machinery according to claim 1, characterized in that, The end sealing assembly (3) includes a plug body (31) and a plug sealing ring (32). The plug body (31) seals one end of the working channel of the valve cavity near the limiting end, and the plug sealing ring (32) is disposed between the plug body (31) and the peripheral wall of the working channel of the valve cavity.

5. The rotary reversing valve for working machinery according to any one of claims 1 to 4, characterized in that, The rotary drive end extends out of the working channel of the valve cavity, and the rotary reversing valve also includes an end sealing assembly (4), which is used to seal the port area of ​​the working channel of the valve cavity near the rotary drive end.

6. The rotary reversing valve for working machinery according to claim 5, characterized in that, The end sealing assembly (4) includes an end sealing ring (41) disposed between the peripheral wall of the working channel of the valve cavity near the rotary drive end and the valve core (2).

7. The rotary reversing valve for operating machinery according to claim 5, characterized in that, The end sealing assembly (4) includes a sealing end cap (42) located at a port in the valve chamber working channel near the rotary drive end, and one end of the sealing end cap (42) extends from the port into the gap between the peripheral wall of the valve chamber working channel and the valve core (2), and the rotary drive end extends out of the valve chamber working channel and passes through the sealing end cap (42).

8. The rotary reversing valve for working machinery according to claim 5, characterized in that, The end sealing assembly (4) includes a rubber sealing sleeve (43), which seals the port of the valve cavity working channel near the rotary drive end. The rotary drive end extends from the valve cavity working channel and passes through the rubber sealing sleeve (43).

9. The rotary reversing valve for working machinery according to any one of claims 1 to 4, characterized in that, The rotary drive end extends from the working channel of the valve cavity and is provided with an operating handle for manually operating the valve core (2) to rotate. The valve body (1) is also provided with a limiting structure (52) for limiting the extreme rotation control position of the operating handle (51).

10. A type of operating machinery, characterized in that, Includes the rotary reversing valve for operating machinery as described in any one of claims 1 to 9.

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