Control valve and rice transplanter

Abstract

The present application relates to a control valve and a rice transplanter. The control valve includes a valve body and a valve stem. The valve body is provided with a valve cavity, a main oil inlet channel, a first oil distribution channel, a second oil distribution channel, a first oil return channel and a second oil return channel. The valve stem is movably arranged in the valve cavity. When the valve stem controls the main oil inlet channel to connect to the first oil distribution channel, the second oil distribution channel connects to the second oil return channel. When the valve stem controls the main oil inlet channel to connect to the second oil distribution channel, the first oil distribution channel connects to the first oil return channel. The control valve also includes a first reset elastic member, which is connected to one end of the valve stem, and the end of the valve stem connected to the first reset elastic member extends out of the valve cavity. The control valve and rice transplanter provided by the present application solve the problem that the joystick is subjected to resistance from pressurized oil in the process of pushing the valve stem to move, thereby increasing the difficulty of the staff in operating the joystick.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural machinery, and in particular to a control valve and a rice transplanter. Background Art

[0002] Typically, a control valve includes a valve body and a valve stem. The valve body is provided with a valve chamber, a main oil inlet passage, a first oil distribution passage, a second oil distribution passage, a first oil return passage, and a second oil return passage. The valve stem is movably mounted within the valve chamber to control the flow of oil between the valve chamber and the first oil distribution passage, the second oil distribution passage, the first oil return passage, and the second oil return passage.

[0003] The operator controls the movement of the valve stem within the valve cavity using a joystick located on one side of the valve stem. To quickly reset the valve stem, a first resetting elastic member is located on the side of the valve stem away from the joystick. This resetting elastic member pushes the valve stem toward the joystick. However, as the valve stem moves within the valve cavity, the end surface of the valve stem connected to the first resetting elastic member is subjected to pressure from the pressurized oil in the valve cavity. Consequently, the joystick experiences resistance from the pressurized oil while pushing the valve stem. This increases the operator's difficulty in operating the joystick and affects their operational feel. Summary of the Invention

[0004] Based on this, it is necessary to provide a control valve and a rice transplanter to solve the problem that the joystick is subjected to resistance from the pressure oil in the process of pushing the valve stem to move, thereby increasing the difficulty of the staff to operate the joystick.

[0005] The control valve provided in the present application includes a valve body and a valve stem. The valve body is provided with a valve cavity, a main oil inlet channel, a first oil distribution channel, a second oil distribution channel, a first oil return channel, and a second oil return channel. The main oil inlet channel is connected to the first oil distribution channel and the second oil distribution channel through the valve cavity, the first oil return channel is connected to the first oil distribution channel through the valve cavity, and the second oil return channel is connected to the second oil distribution channel through the valve cavity. The valve stem is movably arranged in the valve cavity. When the valve stem controls the main oil inlet channel to connect to the first oil distribution channel, the second oil distribution channel is connected to the second oil return channel. When the valve stem controls the main oil inlet channel to connect to the second oil distribution channel, the first oil distribution channel is connected to the first oil return channel. The control valve also includes a first reset elastic member, the first reset elastic member is connected to one end of the valve stem, and the end of the valve stem connected to the first reset elastic member extends out of the valve cavity.

[0006] In one embodiment, the control valve further includes a mounting cap that is detachably connected to the valve body and defines an assembly cavity communicating with the valve cavity. One end of the valve stem extends into the assembly cavity, and a first return elastic member is disposed within the assembly cavity. One end of the first return elastic member is connected to an inner wall of the assembly cavity, and the other end is connected to the valve stem. It is understood that this arrangement facilitates easier installation of the first return elastic member.

[0007] In one embodiment, the first resetting elastic member is a compression spring. It is understandable that such a configuration is conducive to reducing the difficulty of manufacturing the control valve.

[0008] In one embodiment, the compression spring is coaxially disposed with the valve stem, and the maximum extension length of the compression spring along the axial direction of the valve stem is less than the axial length of the assembly cavity along the axial direction of the valve stem. It is understood that this arrangement is advantageous in preventing the end of the valve stem connected to the first return elastic member from retracting into the valve cavity.

[0009] In one embodiment, a guide cavity communicating with the assembly cavity is provided at the end of the mounting cap distal from the valve body. The inner diameter of the guide cavity is smaller than that of the assembly cavity, and one end of the compression spring is inserted into the guide cavity and fits into the inner wall of the guide cavity. This arrangement, as will be appreciated, helps prevent the compression spring from becoming eccentric during expansion and contraction.

[0010] In one embodiment, a first sealing ring is provided at one end of the valve chamber near the mounting cap. The inner side of the first sealing ring is movably mounted on the valve stem, while the outer side of the first sealing ring is fixedly mounted on the inner wall of the valve chamber. It is understood that this arrangement is conducive to improving the sealing performance of the control valve.

[0011] In one embodiment, the mounting cap is provided with a mounting flange at one end close to the valve body, and the mounting flange is detachably connected to the valve body via a fastener. It is understood that such a configuration is conducive to facilitating the connection of the mounting cap to the valve body.

[0012] In one embodiment, the control valve further includes a joystick connected to an end of the valve stem away from the first return elastic member, and the end of the valve stem connected to the joystick extends out of the valve cavity. It is understood that such an arrangement facilitates assembly of the valve stem and the joystick.

[0013] In one embodiment, a second sealing ring is provided at one end of the valve chamber near the operating rod. The inner side of the second sealing ring is movably mounted on the valve rod, while the outer side of the second sealing ring is fixedly mounted on the inner wall of the valve chamber. It is understood that this arrangement is conducive to improving the sealing performance of the control valve.

[0014] The present application also provides a rice transplanter, which includes the control valve described in any one of the above embodiments.

[0015] Compared to the prior art, the control valve and rice transplanter provided by this application have one end of the valve stem connected to the first return elastic member extending out of the valve cavity. This protects the end surface of the valve stem connected to the first return elastic member from the pressure of the pressurized oil in the valve cavity. Furthermore, the operating lever does not experience resistance from the pressurized oil when pushing the valve stem, thereby reducing the difficulty of operating the operating lever and ensuring a smooth and comfortable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A cross-sectional view of a control valve provided for this application;

[0018] Figure 2 A cross-sectional view of the guide seat provided for this application;

[0019] Figure 3 Piping diagram of the control valve provided for this application.

[0020] Reference numerals: 100, valve body; 110, valve chamber; 111, first sealing ring; 112, second sealing ring; 120, main oil inlet channel; 130, first oil distribution channel; 140, second oil distribution channel; 150, first oil return channel; 160, second oil return channel; 170, first oil outlet channel; 180, mounting flare; 190, second oil outlet channel; 200, valve stem; 210, connecting groove; 300, operating Longitudinal rod; 400, first reset elastic member; 500, mounting cap; 510, assembly cavity; 520, mounting flange; 530, guide cavity; 600, pressure-limiting valve; 610, second movable plug; 611, sealing head; 612, guide rod; 620, second reset elastic member; 630, mounting seat; 700, guide seat; 710, guide hole; 720, annular slope; 730, stop flange; 800, unloading valve. DETAILED DESCRIPTION

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0023] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0024] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] See also Figure 1 and Figure 3The control valve provided in the present application includes a valve body 100 and a valve stem 200. The valve body 100 is provided with a valve cavity 110, a main oil inlet channel 120, a first oil distribution channel 130, a second oil distribution channel 140, a first oil return channel 150 and a second oil return channel 160. The main oil inlet channel 120 is connected to the first oil distribution channel 130 and the second oil distribution channel 140 through the valve cavity 110, the first oil return channel 150 is connected to the first oil distribution channel 130 through the valve cavity 110, and the second oil return channel 160 is connected to the second oil distribution channel 140 through the valve cavity 110.

[0028] The valve stem 200 is movably disposed in the valve chamber 110. When the valve stem 200 controls the main oil inlet channel 120 to connect to the first oil distribution channel 130, the second oil distribution channel 140 is connected to the second oil return channel 160. When the valve stem 200 controls the main oil inlet channel 120 to connect to the second oil distribution channel 140, the first oil distribution channel 130 is connected to the first oil return channel 150. Specifically, the valve stem 200 is provided with a plurality of connecting grooves 210. When the control valve controls the rice transplanter to rise, the valve stem 200 is pushed to one side by the joystick 300, and the connecting groove 210 on the valve stem 200 connects the main oil inlet channel 120 and the first oil distribution channel 130, the second oil distribution channel 140 is also connected to the second oil return channel 160 through the connecting groove 210 on the valve stem 200. At this time, the pressure oil enters the first oil distribution channel 130 from the main oil inlet channel 120 through the connecting groove 210, and the pressure oil enters the second oil return channel 160 through the second oil distribution channel 140 to complete the oil return. Similarly, when the control valve controls the rice transplanter to descend, the valve stem 200 is pushed to the other side by the joystick 300, and the connecting groove 210 on the valve stem 200 connects the main oil inlet channel 120 and the second oil distribution channel 140, the first oil distribution channel 130 is also connected to the first oil return channel 150 through the connecting groove 210 on the valve stem 200. At this time, the pressure oil enters the second oil distribution channel 140 from the main oil inlet channel 120 through the connecting groove 210, and the pressure oil enters the first return oil channel 150 through the first oil distribution channel 130 to complete the oil return.

[0029] Typically, a staff member controls the movement of the valve stem 200 within the valve cavity 110 through an operating lever 300 provided on one side of the valve stem 200. Furthermore, in order to quickly reset the valve stem 200, a first return elastic member 400 is provided on the side of the valve stem 200 away from the operating lever 300. The first return elastic member 400 can push the valve stem 200 toward the operating lever 300. However, during the movement of the valve stem 200 within the valve cavity 110, the end surface of the valve stem 200 connected to the first return elastic member 400 is subjected to pressure from the pressurized oil in the valve cavity 110. Consequently, the operating lever 300 is subjected to resistance from the pressurized oil during the process of pushing the valve stem 200 to move, thereby increasing the difficulty of the staff member in operating the operating lever 300 and affecting the staff member's operating feel. In order to solve the problem of difficulty in moving the valve stem 200, a solution of using a first reset elastic member 400 with a lower elastic coefficient is usually adopted to reduce the difficulty of moving the valve stem 200. However, lowering the elastic coefficient of the first reset elastic member 400 will cause the reset ability of the valve stem 200 to decrease, resulting in the valve stem 200 being unable to reset in time, affecting the response sensitivity of the control valve.

[0030] See also Figure 1 To address the difficulty in moving the valve stem 200 without reducing the control valve's sensitivity, the valve stem 200 of the control valve provided in this application extends one end connected to the first return spring 400 out of the valve cavity 110. This protects the end surface of the valve stem 200 connected to the first return spring 400 from the pressure of the pressurized oil in the valve cavity 110. Consequently, the operating lever 300 is not subject to resistance from the pressurized oil when pushing the valve stem 200 to move. This reduces the difficulty for operators in operating the operating lever 300 and does not affect their operational feel.

[0031] In order to reduce the difficulty of installing the first resetting elastic member 400, in one embodiment, as shown in FIG. Figure 1As shown, the control valve further includes a mounting cap 500, which is detachably connected to the valve body 100 and is provided with an assembly cavity 510 communicating with the valve cavity 110. One end of the valve stem 200 extends into the assembly cavity 510, and a first return elastic member 400 is disposed within the assembly cavity 510. One end of the first return elastic member 400 is connected to the inner wall of the assembly cavity 510, and the other end is connected to the valve stem 200. Thus, the first return elastic member 400 is first installed in the assembly cavity 510, and then the mounting cap 500 with the first return elastic member 400 installed is detachably connected to the valve body 100, with one end of the first return elastic member 400 abutting against the valve stem 200 to apply a force to the valve stem 200 away from the mounting cap 500. Specifically, in order to facilitate the connection of the mounting cap 500 to the valve body 100 , in one embodiment, a mounting flange 520 is provided at one end of the mounting cap 500 close to the valve body 100 , and the mounting flange 520 is detachably connected to the valve body 100 via fasteners.

[0032] Furthermore, in order to reduce the manufacturing difficulty of the control valve, in one embodiment, as Figure 1 As shown, the first resetting elastic member 400 is a compression spring, but is not limited thereto. The first resetting elastic member 400 may also be other elastic members such as a spring, which are not listed here one by one.

[0033] In order to prevent the end of the valve stem 200 connected to the first return elastic member 400 from retracting into the valve cavity 110, in one embodiment, as shown in FIG. Figure 1 As shown, the compression spring is coaxially arranged with the valve stem 200, and the maximum extension length of the compression spring along the axial direction of the valve stem 200 is less than the axial length of the assembly cavity 510 along the valve stem 200. Thus, even if the compression spring reaches its maximum extension length, it will not extend out of the assembly cavity 510, and thus will not push the valve stem 200 into the valve cavity 110. This helps the end of the valve stem 200 closest to the first return spring to always remain outside the valve cavity 110.

[0034] In order to prevent the compression spring from being eccentric during the expansion and contraction process, in one embodiment, as shown in FIG. Figure 1 As shown, a guide cavity 530 is provided at the end of the mounting cap 500 away from the valve body 100, communicating with the assembly cavity 510. The inner diameter of the guide cavity 530 is smaller than that of the assembly cavity 510, and one end of the compression spring is inserted into the guide cavity 530 and fits into the inner wall of the guide cavity 530. Furthermore, the guide cavity 530 is first machined into the mounting cap 500, and then the inner diameter of the guide cavity 530 is partially enlarged to form the assembly cavity 510.

[0035] In order to improve the sealing performance of the control valve, in one embodiment, as Figure 1As shown, a first sealing ring 111 is provided at one end of the valve chamber 110 near the mounting cap 500. The inner side of the first sealing ring 111 is movably mounted on the valve stem 200, while the outer side of the first sealing ring 111 is fixedly mounted on the inner wall of the valve chamber 110. This prevents pressurized oil from leaking between the valve stem 200 and the inner wall of the valve chamber 110, thereby significantly improving the sealing performance of the control valve. The first sealing ring 111 can be a rubber ring, a silicone ring, or other materials, which are not listed here.

[0036] In one embodiment, Figure 1 As shown, the operating lever 300 is connected to the end of the valve stem 200 that is away from the first return elastic member 400, and the end of the valve stem 200 connected to the operating lever 300 extends out of the valve cavity 110. This ensures that the end surface of the valve stem 200 connected to the operating lever 300 is not subjected to pressure from the pressurized oil in the valve cavity 110. Consequently, the operating lever 300 is not subject to resistance from the pressurized oil when pushing the valve stem 200, thereby reducing the difficulty of operating the operating lever 300 and ensuring a smooth and comfortable operation. Furthermore, the extension of the end of the valve stem 200 connected to the operating lever 300 out of the valve cavity 110 facilitates assembly of the valve stem 200 and the operating lever 300.

[0037] Likewise, in order to improve the sealing performance of the control valve, in one embodiment, as Figure 1 As shown, a second sealing ring 112 is provided at one end of the valve cavity 110 close to the operating rod 300 . The inner side of the second sealing ring 112 can be movably sleeved on the valve stem 200 , and the outer side of the second sealing ring 112 is fixedly provided on the inner wall of the valve cavity 110 .

[0038] In order to improve the safety of the control valve, in one embodiment, as Figure 1As shown, the valve body 100 is further provided with a first oil outlet channel 170, through which the main oil inlet channel 120 communicates with the first oil return channel 150. Furthermore, the control valve is equipped with a pressure-limiting valve 600. Normally, the pressure-limiting valve 600 closes the first oil outlet channel 170. When the hydraulic pressure of the pressurized oil in the main oil inlet channel 120 exceeds a preset pressure, the pressure-limiting valve 600 opens the first oil outlet channel 170 to connect the main oil inlet channel 120 and the first oil return channel 150. Thus, when the hydraulic pressure of the pressurized oil in the main oil inlet channel 120 exceeds the preset pressure, the pressurized oil in the main oil inlet channel 120 can enter the first oil return channel 150 through the first oil outlet channel 170 for return, thereby reducing the hydraulic pressure in the main oil inlet channel 120. When the hydraulic pressure in the main oil inlet channel 120 is less than the preset pressure, the pressure-limiting valve 600 closes the first oil outlet channel 170. That is, by providing the first oil outlet channel 170 and the pressure limiting valve 600, the hydraulic pressure of the pressurized oil in the main oil inlet channel 120 can be controlled within a range not exceeding a preset pressure value, thereby avoiding damage to the control valve caused by excessive pressure in the control valve.

[0039] Specifically, in order to reduce the difficulty of processing the pressure limiting valve 600, in one embodiment, as shown in FIG. Figure 1 As shown, the pressure-limiting valve 600 includes a second movable plug 610 and a second resetting elastic member 620 connected to one end of the second movable plug 610. The second resetting elastic member can push the second movable plug 610 to block the first oil outlet channel 170. Furthermore, the pressure-limiting valve 600 includes a mounting seat 630, which is detachably connected to the valve body 100. The second movable plug 610 includes a sealing head 611 and a guide rod 612 connected to the sealing head 611. The second resetting elastic member 620 is sleeved on the outer side of the guide rod 612, and one end of the second resetting elastic member 620 abuts the mounting seat 630 and the other end abuts the sealing head 611. During the extension and retraction process, the second resetting elastic member 620 slides with the outer side of the guide rod 612 to push the second movable plug 610 to block the first oil outlet channel 170.

[0040] In order to improve the matching accuracy between the second movable plug 610 and the first oil outlet channel 170 and prevent the second movable plug 610 from being eccentric and causing abnormal noise during the operation of the pressure limiting valve 600, in one embodiment, Figure 1 and Figure 2As shown, a guide seat 700 is provided on the side of the first oil outlet channel 170 near the second movable plug 610. The guide seat 700 is provided with a guide hole 710 that connects to the first oil outlet channel 170. The end of the second movable plug 610 near the guide seat 700 is conical, and the second movable plug 610 and the guide hole 710 are coaxially arranged. When the second movable plug 610 blocks the first oil outlet channel 170, the second movable plug 610 is partially inserted into the guide hole 710. Specifically, the sealing head 611 is conical as a whole. In this way, the second movable plug 610 is partially inserted into the guide hole 710 under the guidance of the guide hole 710, and the inner wall of the guide hole 710 has a certain limiting effect on the second movable plug 610, which can prevent the second movable plug 610 from being eccentric.

[0041] In order to facilitate the insertion of the second movable plug 610 into the guide hole 710, in one embodiment, as shown in FIG. Figure 1 and Figure 2 As shown, the guide seat 700 is provided with an annular bevel 720, which is provided at the opening of the guide hole 710 near one end of the second movable plug 610. This facilitates the second movable plug 610 to slide into the guide hole 710 along the annular bevel 720, thereby improving the fault tolerance of the pressure limiting valve 600.

[0042] Typically, the valve body 100 is formed by casting, but the cast valve body 100 has a low hardness. Under repeated impacts from the second movable plug 610, the valve body 100 is easily deformed, which can cause leakage in the pressure-limiting valve 600. To prevent deformation of the valve body 100 under the impact of the second movable plug 610, in one embodiment, the hardness of the guide seat 700 is greater than that of the valve body 100. This allows the second movable plug 610 to directly impact the guide seat 700, and the contact area between the guide seat 700 and the valve body 100 is much larger than the original contact area between the second movable plug 610 and the valve body 100. This effectively reduces the pressure exerted on the valve body 100 by the second movable plug 610, significantly reducing the probability of deformation of the valve body 100. Furthermore, because the hardness of the guide seat 700 is greater than that of the valve body 100, the guide seat 700 is less likely to deform under the impact of the second movable plug 610, effectively ensuring the sealing of the pressure-limiting valve 600. Furthermore, the guide seat 700 is made of medium carbon steel, which has high hardness and a certain degree of toughness.

[0043] In order to improve the connection strength between the guide seat 700 and the valve body 100, in one embodiment, the guide seat 700 is welded to the valve body 100, or the guide seat 700 is snap-fitted to the valve body 100. However, the guide seat 700 may also be threadedly connected to the valve body 100, which are not listed here.

[0044] In order to ensure that the pressure oil flows smoothly from the first oil outlet channel 170 to the guide hole 710, in one embodiment, as shown in FIG. Figure 1 As shown, the valve body 100 is provided with a mounting flare 180, which is located at one end of the first oil outlet channel 170 near the second movable plug 610. The inner diameter of the mounting flare 180 is larger than the inner diameter of the first oil outlet channel 170. The guide seat 700 is installed at the mounting flare 180, and the inner diameter of the guide hole 710 is equal to the inner diameter of the first oil outlet channel 170. The guide hole 710 is coaxial with the first oil outlet channel 170. In this way, the flow rate of the pressurized oil can be kept stable as it flows from the first oil outlet channel 170 to the guide hole 710, because the pressurized oil does not generate vortices during the flow.

[0045] In order to improve the installation convenience of the guide seat 700, in one embodiment, as Figure 2 As shown, a stop flange 730 is provided at one end of the guide base 700 near the second movable plug 610. The stop flange 730 stops at the edge of the installation flare 180 near the second movable plug 610. In this way, the guide base 700 can be locked at the installation flare 180 during installation by the stop flange 730, thereby achieving the installation and positioning of the guide base 700.

[0046] In order to release the pressure in the control valve in time, in one embodiment, Figure 1 As shown, the valve body 100 is further provided with a second oil outlet channel 190, and the main oil inlet channel 120 is connected to the second oil return channel 160 through the second oil outlet channel 190, and the control valve is equipped with an unloading valve 800. Normally, the unloading valve 800 closes the second oil outlet channel 190. When the pressurized oil in the main oil inlet channel 120 needs to be unloaded, the unloading valve 800 opens the second oil outlet channel 190 to connect the main oil inlet channel 120 and the second oil return channel 160.

[0047] The present application also provides a rice transplanter, which includes the control valve described in any one of the above embodiments.

[0048] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A control valve, characterized in that: The invention comprises a valve body (100) and a valve stem (200); the valve body (100) is provided with a valve cavity (110), a main oil inlet passage (120), a first oil distribution passage (130), a second oil distribution passage (140), a first oil return passage (150) and a second oil return passage (160); the main oil inlet passage (120) is connected to the first oil distribution passage (130) and the second oil distribution passage (140) through the valve cavity (110); the first oil return passage (150) is connected to the first oil distribution passage (130) through the valve cavity (110); and the second oil return passage (160) is connected to the second oil distribution passage (140) through the valve cavity (110); The valve stem (200) is movably disposed in the valve chamber (110); when the valve stem (200) controls the main oil inlet channel (120) to communicate with the first oil distribution channel (130), the second oil distribution channel (140) is connected to the second oil return channel (160); and when the valve stem (200) controls the main oil inlet channel (120) to communicate with the second oil distribution channel (140), the first oil distribution channel (130) is connected to the first oil return channel (150); The control valve further comprises a first resetting elastic member (400), the first resetting elastic member (400) being connected to one end of the valve stem (200), and the end of the valve stem (200) connected to the first resetting elastic member (400) extending out of the valve cavity (110); The valve body (100) is further provided with a second oil outlet passage (190), and the main oil inlet passage (120) is connected to the second oil return passage (160) through the second oil outlet passage (190). In addition, the control valve is equipped with an unloading valve (800). When the pressure oil in the main oil inlet passage (120) needs to be unloaded, the unloading valve (800) opens the second oil outlet passage (190) to connect the main oil inlet passage (120) and the second oil return passage (160). The valve body (100) is further provided with a first oil outlet channel (170), and the main oil inlet channel (120) is connected to the first oil return channel (150) through the first oil outlet channel (170). In addition, the control valve is equipped with a pressure limiting valve (600). When the hydraulic pressure value of the pressure oil in the main oil inlet channel (120) is greater than a preset pressure value, the pressure limiting valve (600) opens the first oil outlet channel (170) to connect the main oil inlet channel (120) and the first oil return channel (150).

2. The control valve according to claim 1, characterized in that The valve body (100) further includes a mounting cap (500), wherein the mounting cap (500) is detachably connected to the valve body (100), and the mounting cap (500) is provided with an assembly cavity (510) communicating with the valve cavity (110), one end of the valve stem (200) extends into the assembly cavity (510), the first reset elastic member (400) is provided in the assembly cavity (510), and one end of the first reset elastic member (400) is connected to the inner wall of the assembly cavity (510), and the other end is connected to the valve stem (200).

3. The control valve according to claim 2, characterized in that The first resetting elastic member (400) is a compression spring.

4. The control valve according to claim 3, characterized in that The compression spring is coaxially arranged with the valve stem (200), and the maximum extension length of the compression spring along the axial direction of the valve stem (200) is smaller than the axial length of the assembly cavity (510) along the axial direction of the valve stem (200).

5. The control valve according to claim 3, characterized in that A guide cavity (530) communicating with the assembly cavity (510) is provided at one end of the mounting cap (500) away from the valve body (100); the inner diameter of the guide cavity (530) is smaller than the inner diameter of the assembly cavity (510); and one end of the compression spring is inserted into the guide cavity (530) and is gap-matched with the inner wall of the guide cavity (530).

6. The control valve according to claim 2, characterized in that A first sealing ring (111) is provided at one end of the valve cavity (110) close to the mounting cap (500), the inner side of the first sealing ring (111) can be movably sleeved on the valve stem (200), and the outer side of the first sealing ring (111) is fixedly arranged on the inner wall of the valve cavity (110).

7. The control valve according to claim 2, characterized in that An installation flange (520) is provided at one end of the installation cap (500) close to the valve body (100), and the installation flange (520) is detachably connected to the valve body (100) via a fastener.

8. The control valve according to claim 1, wherein: The control valve further comprises an operating rod (300), wherein the operating rod (300) is connected to an end of the valve stem (200) away from the first reset elastic member (400), and an end of the valve stem (200) connected to the operating rod (300) extends out of the valve cavity (110).

9. The control valve according to claim 8, characterized in that A second sealing ring (112) is provided at one end of the valve cavity (110) close to the operating rod (300), the inner side of the second sealing ring (112) can be movably sleeved on the valve stem (200), and the outer side of the second sealing ring (112) is fixedly arranged on the inner wall of the valve cavity (110).

10. A rice transplanter, characterized in that: Comprising the control valve according to any one of claims 1 to 9.

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