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 pressure balancing mechanism. The valve body is provided with a pressure balancing chamber and an oil return channel. The pressure balancing mechanism can be movably arranged in the pressure balancing chamber, and one end of the pressure balancing chamber is connected to the oil return channel, and the end of the pressure balancing mechanism away from the oil return channel is used to connect to the load mechanism of the rice transplanter. When the hydraulic value of the pressure oil on the side of the pressure balancing chamber connected to the oil return channel is less than the pressure value of the pressure balancing mechanism subjected to the load mechanism, the pressure balancing mechanism can move toward the side close to the oil return channel and reduce the opening of the oil return channel. The control valve and rice transplanter provided by the present application solve the problem that when the load borne by the load mechanism increases, the excessive return oil flow rate of the oil return channel will lead to an increase in the power consumption of the rice transplanter.

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] Usually, a rice transplanter includes a control valve and a load mechanism. The movement of the rice transplanter is controlled by the control valve. The load mechanism is mainly a load-bearing mechanism such as a seedling platform. The seedling platform is generally used to place the seedlings. The control valve includes a valve body, and the valve body is provided with an oil return channel. When the seedling platform descends, the control valve returns oil through the oil return channel in the valve body. However, when the load on the load mechanism increases, the oil return flow rate of the oil return channel is too large, which will increase the power consumption of the rice transplanter and increase the use cost of the rice transplanter. Summary of the invention

[0003] Based on this, it is necessary to provide a control valve and a rice transplanter to solve the problem that when the load borne by the load mechanism increases, the return oil flow rate of the return oil channel is too large, which will lead to increased power consumption of the rice transplanter.

[0004] The control valve provided in the present application includes a valve body and a pressure balancing mechanism, wherein the valve body is provided with a pressure balancing chamber and an oil return channel, wherein the pressure balancing mechanism is movably arranged in the pressure balancing chamber, and one end of the pressure balancing chamber is connected to the oil return channel, and the end of the pressure balancing mechanism away from the oil return channel is used to connect to the load mechanism of the rice transplanter. When the hydraulic value of the pressure oil on the side of the pressure balancing chamber connected to the oil return channel is less than the pressure value of the pressure balancing mechanism subjected to the load mechanism, the pressure balancing mechanism can move toward the side close to the oil return channel and reduce the opening of the oil return channel. When the hydraulic value of the pressure oil on the side of the pressure balancing chamber connected to the oil return channel is greater than the pressure value of the pressure balancing mechanism subjected to the load mechanism, the pressure oil in the oil return channel can push the pressure balancing mechanism to move toward the side away from the oil return channel and increase the opening of the oil return channel. The oil return channel includes a first oil return section and a second oil return section, the first oil return section and the second oil return section are respectively connected to the pressure balance chamber, the flow direction of the pressurized oil in the oil return channel is from the first oil return section to the second oil return section, and the pressure balance mechanism controls the opening of the oil return channel by controlling the opening of one of the first oil return section and the second oil return section.

[0005] In one embodiment, the pressure balancing mechanism includes a movable valve plug and a one-way hydraulic valve, the movable valve plug can be movably arranged in the pressure balancing chamber, and the movable valve plug divides the pressure balancing chamber, and pressure oil is arranged between the one-way hydraulic valve and the load mechanism, and the load mechanism can apply pressure to the one-way hydraulic valve through the pressure oil, so that the one-way hydraulic valve pushes the movable valve plug to move toward the side close to the oil return channel and reduce the opening of the oil return channel. It can be understood that such a configuration is conducive to reducing the structural complexity of the pressure balancing mechanism.

[0006] In one of the embodiments, the one-way hydraulic valve includes a valve seat, a movable plug and a reset elastic member, the valve seat is provided with a hydraulic cavity, the movable plug and the reset elastic member are both installed in the hydraulic cavity, and one end of the reset elastic member is connected to the inner wall of the hydraulic cavity, and the other end is connected to the movable plug, so that the movable plug applies a force on the movable valve plug to move toward the side close to the return oil channel, and the hydraulic cavity on the side of the movable plug close to the reset elastic member is used to fill the pressurized oil connected to the load mechanism.

[0007] In one embodiment, the one-way hydraulic valve further includes a stop protrusion, which stops at the opening of the hydraulic chamber on the side of the movable plug away from the reset elastic member to stop the movable plug. It can be understood that such a configuration is conducive to improving the disassembly and assembly efficiency of the control valve.

[0008] In one embodiment, the stop protrusion is integrally formed with the valve seat. It is understandable that such a configuration is conducive to improving the structural strength of the control valve.

[0009] In one embodiment, a contact rod is fixedly arranged on one side of the movable valve plug close to the one-way hydraulic valve, the outer diameter of the contact rod is smaller than the outer diameter of the movable valve plug, and the contact rod can be movably arranged in the hydraulic cavity and contact the movable plug. It can be understood that such a configuration is conducive to the movable valve plug contacting the one-way hydraulic valve.

[0010] In one embodiment, the hydraulic chamber has an assembly port at one end away from the movable valve plug, and the movable plug and the reset elastic member can be installed in the hydraulic chamber through the assembly port, and a high-pressure plug is provided at the assembly port to block the assembly port. It can be understood that such a configuration is conducive to improving the assembly efficiency of the one-way hydraulic valve.

[0011] In one embodiment, a guide rod is fixedly arranged on one side of the high-pressure plug close to the movable plug, and the reset elastic member is a compression spring, which is sleeved on the guide rod. It can be understood that such a configuration is conducive to preventing the compression spring from being eccentric during the expansion and contraction process.

[0012] In one embodiment, the first oil return section and the second oil return section are staggered along the axial direction of the pressure balance chamber, and the inner diameter of the second oil return section is smaller than the inner diameter of the first oil return section. The pressure balance mechanism controls the opening of the oil return channel by controlling the opening of the second oil return section. It can be understood that such a setting is conducive to the rapid increase of the hydraulic pressure of the pressure balance chamber on the side close to the oil return channel, thereby quickly pushing the pressure balance mechanism.

[0013] The present application also provides a rice transplanter, which includes the control valve described in any one of the above embodiments.

[0014] Compared with the prior art, the control valve and rice transplanter provided by the present application, when the load of the load mechanism increases, the existing balance state of the pressure balance mechanism is broken, and the load mechanism pushes the pressure balance mechanism to close part of the return oil channel, so that the opening of the return oil channel is reduced, and the return oil flow rate of the return oil channel is reduced, and then the hydraulic pressure in the return oil channel is increased and reaches a new balance with the load mechanism. At this time, the power consumption of the rice transplanter will be correspondingly reduced due to the reduction in the return oil flow rate of the return oil channel, thereby reducing the use cost of the rice transplanter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. 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.

[0016] Figure 1 A cross-sectional view of a control valve provided for this application;

[0017] Figure 2 for Figure 1 An enlarged view of point A is shown.

[0018] Attached to the figure are: 100, valve body; 110, pressure balancing chamber; 120, oil return channel; 121, first oil return section; 122, second oil return section; 200, pressure balancing mechanism; 210, movable valve plug; 211, abutment rod; 212, annular groove; 220, one-way hydraulic valve; 221, valve seat; 222, movable plug; 223, reset elastic member; 224, hydraulic chamber; 225, assembly port; 226, stop protrusion; 227, guide rod; 228, high-pressure plug. DETAILED DESCRIPTION

[0019] 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 referred device or element 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.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature 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. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0025] Usually, the rice transplanter includes a control valve and a load mechanism (not shown in the figure). The movement of the rice transplanter is controlled by the control valve. The load mechanism is mainly a load-bearing mechanism such as a seedling platform. The seedling platform is generally used to place the seedlings. The control valve includes a valve body 100, and the valve body 100 is provided with an oil return channel 120. When the seedling platform descends, the control valve returns oil through the oil return channel 120 in the valve body 100. However, when the load borne by the load mechanism increases, the oil return flow rate of the oil return channel 120 is too large, which will increase the power consumption of the rice transplanter and increase the use cost of the rice transplanter.

[0026] See also Figure 1 and Figure 2 In order to solve the problem that when the load on the load mechanism increases, the return oil flow rate of the return oil channel 120 is too large, which will increase the power consumption of the rice transplanter, the present application provides a control valve, which includes a valve body 100 and a pressure balancing mechanism 200. The valve body 100 is provided with a pressure balancing chamber 110 and an oil return channel 120. The pressure balancing mechanism 200 can be movably arranged in the pressure balancing chamber 110, and one end of the pressure balancing chamber 110 is connected to the oil return channel 120. The end of the pressure balancing mechanism 200 away from the oil return channel 120 is used to connect the load mechanism of the rice transplanter. It should be noted that the pressure balancing mechanism 200 is mainly connected to the load mechanism of the rice transplanter through pressure oil. In layman's terms, the pressure of the load mechanism is transmitted to the pressure balancing mechanism 200 through the pressure oil. The core of the above principle is to utilize the characteristics of liquid that is extremely difficult to be compressed, so as to realize the real-time transmission of pressure between the pressure balancing mechanism 200 and the load mechanism. Similarly, the pressure between the pressure balancing mechanism 200 and the oil return channel 120 is also transmitted in real time through the pressure oil. It should be noted that the oil path connecting the load mechanism to the pressure balancing mechanism 200 is not shown in the drawings of the specification.

[0027] In this way, the pressure balancing mechanism 200 is in a dynamic balance between the pressure of the pressure oil in the oil return channel 120 and the pressure transmitted by the load platform through the pressure oil. Moreover, since the pressure balancing mechanism 200 is movably arranged in the pressure balancing chamber 110, when the hydraulic pressure value of the pressure oil in the pressure balancing chamber 110 connected to the oil return channel 120 is less than the pressure value of the pressure balancing mechanism 200 subjected to the load mechanism, the pressure balancing mechanism 200 can move toward the side close to the oil return channel 120 and reduce the opening of the oil return channel 120. That is, when the load of the load mechanism increases, the existing equilibrium state of the pressure balancing mechanism 200 is broken, and the load mechanism pushes the pressure balancing mechanism 200 to close part of the oil return channel 120, so that the opening of the oil return channel 120 is reduced, and the oil return flow rate of the oil return channel 120 is reduced, and then the hydraulic pressure in the oil return channel 120 is increased and a new balance is reached with the load mechanism. At this time, the power consumption of the rice transplanter will be reduced accordingly due to the reduction of the oil return flow rate of the oil return channel 120, thereby reducing the use cost of the rice transplanter. Similarly, when the hydraulic value of the pressure oil on one side of the pressure balance chamber 110 connected to the oil return channel 120 is greater than the pressure value of the pressure balance mechanism 200 subjected to the load mechanism, the pressure oil in the oil return channel 120 can push the pressure balance mechanism 200 to move toward the side away from the oil return channel 120 and increase the opening of the oil return channel 120. That is, when the load of the load mechanism decreases, the existing equilibrium state of the pressure balance mechanism 200 is broken, and the load mechanism pushes the pressure balance mechanism 200 to open part of the oil return channel 120, so that the opening of the oil return channel 120 increases, and the oil return flow rate of the oil return channel 120 increases, thereby reducing the hydraulic pressure in the oil return channel 120 and reaching a new balance with the load mechanism. At this time, the working efficiency of the rice transplanter will be improved due to the increase in the oil return flow rate.

[0028] In order to facilitate the pressure balance mechanism 200 to control the flow rate of the pressure oil in the oil return channel 120, in one embodiment, as shown in FIG. Figure 1 and Figure 2As shown, the oil return channel 120 includes a first oil return section 121 and a second oil return section 122, and the first oil return section 121 and the second oil return section 122 are respectively connected to the pressure balance chamber 110. The flow direction of the pressurized oil in the oil return channel 120 is from the first oil return section 121 to the second oil return section 122. The pressure balance mechanism 200 controls the opening of the oil return channel 120 by controlling the opening of one of the first oil return section 121 and the second oil return section 122. According to the short plate effect, the return oil flow rate of the return oil channel 120 depends on the part with the smallest inner diameter of the return oil channel 120, that is, the pressure balance mechanism 200 can control the opening of the entire return oil channel 120 by controlling the opening of the first return oil section 121, and the pressure balance mechanism 200 can also control the opening of the entire return oil channel 120 by controlling the opening of the second return oil section 122. The pressure balance mechanism 200 can also control the opening of the entire return oil channel 120 by simultaneously controlling the opening of the first return oil section 121 and the second return oil section 122. In this way, by dividing the return oil channel 120 into the first return oil section 121 and the second return oil section 122, which are separately arranged, the pressure balance mechanism 200 can control the flow rate of the pressure oil in the return oil channel 120 by blocking part or all of the openings of the first return oil section 121 or the second return oil section 122 in the pressure balance chamber 110, that is, such a setting greatly improves the control efficiency of the control valve.

[0029] In order to facilitate the rapid increase of the hydraulic pressure of the pressure balance chamber 110 near the oil return channel 120, and then quickly push the pressure balance mechanism 200. Further, in this embodiment, Figure 1 and Figure 2 As shown, the first oil return section 121 and the second oil return section 122 are staggered along the axial direction of the pressure balance chamber 110, and the inner diameter of the second oil return section 122 is smaller than the inner diameter of the first oil return section 121. The pressure balance mechanism 200 controls the opening of the oil return channel 120 by controlling the opening of the second oil return section 122. In this way, the speed at which the pressure oil enters the pressure balance chamber 110 from the first oil return section 121 is greater than the speed at which the pressure oil flows from the balance chamber into the second oil return section 122, which is conducive to the pressure oil quickly forming a large hydraulic pressure in the pressure balance chamber 110, thereby applying pressure to the pressure balance mechanism 200. However, it is not limited to this. In other embodiments, the inner diameter of the second oil return section 122 can also be equal to or greater than the inner diameter of the first oil return section 121.

[0030] In order to reduce the structural complexity of the pressure balancing mechanism 200, in one embodiment, as Figure 1 and Figure 2As shown, the pressure balancing mechanism 200 includes a movable valve plug 210 and a one-way hydraulic valve 220. The movable valve plug 210 is movably arranged in the pressure balancing chamber 110, and the movable valve plug 210 separates the pressure balancing chamber 110. A pressure oil is arranged between the one-way hydraulic valve 220 and the load mechanism. The load mechanism can apply pressure to the one-way hydraulic valve 220 through the pressure oil, so that the one-way hydraulic valve 220 pushes the movable valve plug 210 to move toward the side close to the return oil channel 120 and reduces the opening of the return oil channel 120. It should be noted that the one-way hydraulic valve 220 is mainly connected to the load mechanism of the rice transplanter through the pressure oil. In layman's terms, the pressure of the load mechanism is transmitted to the one-way hydraulic valve 220 through the pressure oil, and the one-way hydraulic valve 220 pushes the movable valve plug 210 to move toward the side close to the return oil channel 120. However, it is not limited to this. In other embodiments, the movable valve plug 210 and the one-way hydraulic valve 220 can also be integrally formed.

[0031] Specifically, in one embodiment, if Figure 1 and Figure 2 As shown, the one-way hydraulic valve 220 includes a valve seat 221, a movable plug 222 and a reset elastic member 223. The valve seat 221 is provided with a hydraulic cavity 224. The movable plug 222 and the reset elastic member 223 are both installed in the hydraulic cavity 224. One end of the reset elastic member 223 is connected to the inner wall of the hydraulic cavity 224, and the other end is connected to the movable plug 222, so that the movable plug 222 exerts a force on the movable valve plug 210 to move toward the side close to the return oil channel 120. The hydraulic cavity 224 on the side of the movable plug 222 close to the reset elastic member 223 is used to fill the pressure oil connected to the load mechanism. In this way, the pressure oil provided at the load mechanism end can indirectly push the movable valve plug 210 to move by pushing the movable plug 222. Furthermore, the reset elastic member 223 is a compression spring, which is simple to manufacture and easy to install, which is conducive to reducing the manufacturing cost of the control valve. Furthermore, the movable plug 222 is a steel ball, which is easy to process and install, and is also beneficial to reducing the manufacturing cost of the control valve.

[0032] In order to improve the disassembly and assembly efficiency of the control valve, in one embodiment, as Figure 1 and Figure 2 As shown, the one-way hydraulic valve 220 further includes a stop protrusion 226, which stops at the opening of the hydraulic chamber 224 on the side of the movable plug 222 away from the reset elastic member 223 to stop the movable plug 222. In this way, the movable range of the movable plug 222 will be limited within the hydraulic chamber 224, and when the one-way hydraulic valve 220 is disassembled, the valve seat 221, the movable plug 222 and the reset elastic member 223 can be disassembled and assembled synchronously, which greatly improves the disassembly and assembly efficiency of the control valve.

[0033] Further, in order to improve the structural strength of the control valve, in one embodiment, as Figure 1 and Figure 2 As shown, the stop protrusion 226 is integrally formed with the valve seat 221. Specifically, the annular stop protrusion 226 and the valve seat 221 are directly processed by turning or casting.

[0034] In order to facilitate the movable valve plug 210 to abut against the one-way hydraulic valve 220, in one embodiment, as Figure 1 and Figure 2 As shown, abutment rod 211 is fixedly provided on one side of movable valve plug 210 close to one-way hydraulic valve 220 . The outer diameter of abutment rod 211 is smaller than the outer diameter of movable valve plug 210 . Abutment rod 211 can be movably passed through hydraulic cavity 224 and abut against movable plug 222 .

[0035] In order to improve the assembly efficiency of the one-way hydraulic valve 220, in one embodiment, as Figure 1 and Figure 2 As shown, the hydraulic chamber 224 has an assembly port 225 at one end away from the movable valve plug 210 , and the movable plug 222 and the reset elastic member 223 can be installed in the hydraulic chamber 224 through the assembly port 225 . A high-pressure plug 228 is provided at the assembly port 225 to seal the assembly port 225 .

[0036] Furthermore, in order to prevent the compression spring from being eccentric during the expansion and contraction process, in one embodiment, as Figure 1 and Figure 2 As shown, a guide rod 227 is fixedly provided on one side of the high-pressure plug 228 close to the movable plug 222 , and the reset elastic member 223 is a compression spring, and the reset elastic member 223 is sleeved on the guide rod 227 .

[0037] In order to prevent the movable valve plug 210 from being eccentric and improve the activity stability of the movable valve plug 210, in one embodiment, as shown in FIG. Figure 1 and Figure 2 As shown, the outer wall of the movable valve plug 210 is in clearance with the inner wall of the pressure balance chamber 110, and a plurality of annular grooves 212 are provided on the outer periphery of the movable valve plug 210, and the plurality of annular grooves 212 are distributed along the length direction of the movable valve plug 210. During the movement of the movable valve plug 210, the pressure oil penetrates into and fills the annular groove 212 through the gap between the outer wall of the movable valve plug 210 and the inner wall of the pressure balance chamber 110, which is conducive to reducing the friction resistance between the movable valve plug 210 and the inner wall of the pressure balance chamber 110 and improving the movement flexibility of the annular groove 212. In addition, the annular groove 212 is filled with pressure oil, which is conducive to preventing the movable valve plug 210 from being eccentric under the pressure of the pressure oil, and improving the movement stability of the movable valve plug 210.

[0038] The present application also provides a rice transplanter, which includes the control valve described in any one of the above embodiments.

[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0040] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A control valve, characterized in that: The invention comprises a valve body (100) and a pressure balancing mechanism (200), wherein the valve body (100) is provided with a pressure balancing chamber (110) and an oil return passage (120), the pressure balancing mechanism (200) is movably arranged in the pressure balancing chamber (110), and one end of the pressure balancing chamber (110) is connected to the oil return passage (120), and one end of the pressure balancing mechanism (200) away from the oil return passage (120) is used for connecting to a load mechanism of a rice transplanter; When the hydraulic value of the pressure oil on the side of the pressure balance chamber (110) connected to the oil return channel (120) is less than the pressure value of the pressure balance mechanism (200) subjected to the load mechanism, the pressure balance mechanism (200) can move toward the side close to the oil return channel (120) and reduce the opening of the oil return channel (120); When the hydraulic value of the pressure oil on the side of the pressure balance chamber (110) connected to the oil return channel (120) is greater than the pressure value of the pressure balance mechanism (200) subjected to the load mechanism, the pressure oil in the oil return channel (120) can push the pressure balance mechanism (200) to move toward the side away from the oil return channel (120) and increase the opening of the oil return channel (120); The oil return passage (120) comprises a first oil return section (121) and a second oil return section (122); the first oil return section (121) and the second oil return section (122) are respectively connected to the pressure balance chamber (110); the flow direction of the pressure oil in the oil return passage (120) is from the first oil return section (121) to the second oil return section (122); the pressure balance mechanism (200) controls the opening of the oil return passage (120) by controlling the opening of one of the first oil return section (121) and the second oil return section (122); The pressure balancing mechanism (200) comprises a movable valve plug (210) and a one-way hydraulic valve (220); the movable valve plug (210) is movably arranged in the pressure balancing chamber (110), and the movable valve plug (210) separates the pressure balancing chamber (110); pressure oil is arranged between the one-way hydraulic valve (220) and the load mechanism; the load mechanism can apply pressure to the one-way hydraulic valve (220) through the pressure oil, so that the one-way hydraulic valve (220) pushes the movable valve plug (210) to move toward a side close to the oil return channel (120), and reduces the opening of the oil return channel (120).

2. The control valve according to claim 1, characterized in that: The one-way hydraulic valve (220) comprises a valve seat (221), a movable plug (222) and a reset elastic member (223); the valve seat (221) is provided with a hydraulic cavity (224); the movable plug (222) and the reset elastic member (223) are both installed in the hydraulic cavity (224); one end of the reset elastic member (223) is connected to the inner wall of the hydraulic cavity (224); and the other end is connected to the movable plug (222), so that the movable plug (222) exerts a force on the movable valve plug (210) to move toward a side close to the oil return channel (120); and the hydraulic cavity (224) on the side of the movable plug (222) close to the reset elastic member (223) is used to be filled with pressure oil connected to a load mechanism.

3. The control valve according to claim 2, characterized in that: The one-way hydraulic valve (220) further comprises a stop protrusion (226), wherein the stop protrusion (226) stops at an opening of the hydraulic chamber (224) on a side of the movable plug (222) away from the reset elastic member (223) to stop the movable plug (222).

4. The control valve according to claim 3, characterized in that: The stop protrusion (226) and the valve seat (221) are integrally formed.

5. The control valve according to claim 2, characterized in that: A contact rod (211) is fixedly provided on one side of the movable valve plug (210) close to the one-way hydraulic valve (220); the outer diameter of the contact rod (211) is smaller than the outer diameter of the movable valve plug (210); and the contact rod (211) can be movably inserted into the hydraulic chamber (224) and contact the movable plug (222).

6. The control valve according to claim 2, characterized in that: The hydraulic chamber (224) has an assembly port (225) at one end away from the movable valve plug (210), and the movable plug (222) and the reset elastic member (223) can be installed in the hydraulic chamber (224) through the assembly port (225). A high-pressure plug (228) is provided at the assembly port (225) to seal the assembly port (225).

7. The control valve according to claim 6, characterized in that A guide rod (227) is fixedly provided on one side of the high-pressure plug (228) close to the movable plug (222); the reset elastic member (223) is a compression spring; and the reset elastic member (223) is sleeved on the guide rod (227).

8. The control valve according to claim 1, characterized in that: The first oil return section (121) and the second oil return section (122) are staggered along the axial direction of the pressure balance chamber (110), and the inner diameter of the second oil return section (122) is smaller than the inner diameter of the first oil return section (121). The pressure balance mechanism (200) controls the opening of the oil return channel (120) by controlling the opening of the second oil return section (122).

9. A rice transplanter, characterized in that: Comprising a control valve as described in any one of claims 1-8.

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