Control valve and transplanter

Abstract

This application relates to a control valve and a transplanter. The control valve includes a valve body and a pressure balance mechanism. The valve body is provided with a pressure balance cavity and an oil return passage. The pressure balance mechanism is movably arranged in the pressure balance cavity, and one end of the pressure balance cavity communicates with the oil return passage. The end of the pressure balance mechanism away from the oil return passage is used to connect the load mechanism of the transplanter. When the hydraulic value of the pressure oil on the side where the pressure balance cavity communicates with the oil return passage is greater than the pressure value exerted on the pressure balance mechanism by the load mechanism, the pressure balance mechanism can move towards the side close to the oil return passage and reduce the opening degree of the oil return passage. The control valve and the transplanter provided by this application solve the problem that when the load borne by the load mechanism increases, the excessive oil return flow rate of the oil return passage will cause an increase in the power consumption of the transplanter.

Description

Technical Field

[0001] This application relates to the technical field of agricultural machinery, and particularly to a control valve and a transplanter. Background Art

[0002] Generally, a transplanter includes a control valve and a load mechanism. The operation of the transplanter is controlled by the control valve. The load mechanism is mainly a load-bearing mechanism such as a seedling table, and the seedling table is generally used to place seedlings. The control valve includes a valve body, and the valve body is provided with an oil return passage. When the seedling table descends, the control valve returns oil through the oil return passage in the valve body. However, when the load borne by the load mechanism increases, the excessive oil return flow rate in the oil return passage will cause an increase in the power consumption of the transplanter and increase the use cost of the transplanter. Summary of the Invention

[0003] Based on this, it is necessary to provide a control valve and a transplanter to solve the problem that when the load borne by the load mechanism increases, the excessive oil return flow rate in the oil return passage will cause an increase in the power consumption of the transplanter.

[0004] The control valve provided by this application includes a valve body and a pressure balance mechanism. The valve body is provided with a pressure balance chamber and an oil return passage. The pressure balance mechanism is movably arranged in the pressure balance chamber, and one end of the pressure balance chamber communicates with the oil return passage. The end of the pressure balance mechanism away from the oil return passage is used to connect the load mechanism of the transplanter. When the hydraulic value of the pressure oil on the side where the pressure balance chamber communicates with the oil return passage is less than the pressure value of the pressure balance mechanism received by the load mechanism, the pressure balance mechanism can move towards the side close to the oil return passage and reduce the opening degree of the oil return passage. When the hydraulic value of the pressure oil on the side where the pressure balance chamber communicates with the oil return passage is greater than the pressure value of the pressure balance mechanism received by the load mechanism, the pressure oil in the oil return passage can push the pressure balance mechanism towards the side away from the oil return passage and increase the opening degree of the oil return passage.

[0005] In one embodiment, the pressure balance mechanism includes a movable valve plug and a one-way hydraulic valve. The movable valve plug is movably arranged in the pressure balance chamber, and the movable valve plug divides the pressure balance chamber. There is pressure oil between the one-way hydraulic valve and the load mechanism. 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 towards the side close to the oil return passage and reduces the opening degree of the oil return passage. It can be understood that such a setting is beneficial to reducing the structural complexity of the pressure balance mechanism.

[0006] In one embodiment, 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 chamber. The movable plug and the reset elastic member are both installed in the hydraulic chamber. One end of the reset elastic member is connected to the inner wall of the hydraulic chamber, and the other end is connected to the movable plug, so that the movable plug applies a force to the movable valve plug to move it toward the side close to the oil return passage. The hydraulic chamber on the side of the movable plug close to the reset elastic member is used to fill the pressure oil connecting the load mechanism.

[0007] In one embodiment, the one-way hydraulic valve further includes a stop projection. The stop projection 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 setting is beneficial to improving the disassembly and assembly efficiency of the control valve.

[0008] In one embodiment, the stop projection is integrally formed with the valve seat. It can be understood that such a setting is beneficial to improving the structural strength of the control valve.

[0009] In one embodiment, an abutting rod is fixedly provided on the side of the movable valve plug close to the one-way hydraulic valve. The outer diameter of the abutting rod is smaller than the outer diameter of the movable valve plug, and the abutting rod is movably inserted through the hydraulic chamber and abuts against the movable plug. It can be understood that such a setting is beneficial to the movable valve plug to abut against the one-way hydraulic valve.

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

[0011] In one embodiment, a guiding rod is fixedly provided on the side of the high-pressure plug close to the movable plug. The reset elastic member is a compression spring, and the compression spring is sleeved on the guiding rod. It can be understood that such a setting is beneficial to preventing the compression spring from being eccentric during the telescopic process.

[0012] In one embodiment, the outer side wall of the movable valve plug is in clearance fit with the inner wall of the pressure balance chamber. A plurality of annular grooves are provided on the outer circumference of the movable valve plug, and the plurality of annular grooves are distributed along the length direction of the movable valve plug.

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

[0014] Compared with the prior art, for the control valve and the 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. The load mechanism pushes the pressure balance mechanism to close part of the oil return passage, reducing the opening degree of the oil return passage, decreasing the oil return flow rate of the oil return passage, and then increasing the hydraulic pressure in the oil return passage to reach a new balance with the load mechanism. At this time, the power consumption of the transplanter will correspondingly decrease due to the reduction of the oil return flow rate of the oil return passage, thereby reducing the usage cost of the 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 prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a cross-sectional view of the control valve provided by the present application;

[0017] Figure 2 is Figure 1 an enlarged view of the position A shown.

[0018] Reference numerals: 100, valve body; 110, pressure balance chamber; 120, oil return passage; 121, first oil return section; 122, second oil return section; 200, pressure balance mechanism; 210, movable valve plug; 211, abutting rod; 212, annular groove; 220, one-way hydraulic valve; 221, valve seat; 222, movable plug; 223, return elastic member; 224, hydraulic chamber; 225, assembly port; 226, stop projection; 227, guide rod; 228, high-pressure plug. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present application.

[0020] In addition, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0021] In this application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be 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, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0023] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be a middle 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 middle element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific implementations 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] Generally, a transplanter includes a control valve and a load mechanism (not shown in the figure). The operation of the transplanter is controlled by the control valve. The load mechanism is mainly a load-bearing mechanism such as a seedling table, and the seedling table is generally used to place seedlings. The control valve includes a valve body 100. The valve body 100 is provided with an oil return passage 120. When the seedling table descends, the control valve returns oil through the oil return passage 120 in the valve body 100. However, when the load borne by the load mechanism increases, an excessive oil return flow rate in the oil return passage 120 will cause an increase in the power consumption of the transplanter and increase the use cost of the transplanter.

[0026] Please refer to Figure 1 and Figure 2 To solve the problem that when the load borne by the load mechanism increases, an excessive oil return flow rate in the oil return passage 120 will cause an increase in the power consumption of the transplanter, the present application provides a control valve. The control valve includes a valve body 100 and a pressure balance mechanism 200. The valve body 100 is provided with a pressure balance chamber 110 and an oil return passage 120. The pressure balance mechanism 200 is movably disposed in the pressure balance chamber 110, and one end of the pressure balance chamber 110 communicates with the oil return passage 120. The end of the pressure balance mechanism 200 away from the oil return passage 120 is used to connect the load mechanism of the transplanter. It should be noted that the pressure balance mechanism 200 is mainly connected to the load mechanism of the transplanter through pressure oil. Generally speaking, the pressure of the load mechanism is transmitted to the pressure balance mechanism 200 through pressure oil. The core of the above principle is to utilize the characteristic that liquid is extremely difficult to be compressed, so as to realize the real-time transmission of pressure between the pressure balance mechanism 200 and the load mechanism. Similarly, the pressure between the pressure balance mechanism 200 and the oil return passage 120 is also transmitted in real time through pressure oil. It should be noted that the oil circuit connecting the load mechanism to the pressure balance mechanism 200 is not shown in the accompanying drawings of the specification.

[0027] In this way, the pressure balance mechanism 200 is in a dynamic balance between the pressure of the pressurized oil in the oil return passage 120 and the pressure transmitted by the load platform through the pressurized oil in real time. Moreover, since the pressure balance mechanism 200 is movably disposed in the pressure balance chamber 110, when the hydraulic pressure of the pressurized oil on the side where the pressure balance chamber 110 communicates with the oil return passage 120 is less than the pressure value of the pressure balance mechanism 200 exerted by the load mechanism, the pressure balance mechanism 200 can move toward the side close to the oil return passage 120 and reduce the opening degree of the oil return passage 120. That is, when the load of the load mechanism increases, the existing balance state of the pressure balance mechanism 200 is broken, and the load mechanism closes part of the oil return passage 120 by pushing the pressure balance mechanism 200, so that the opening degree of the oil return passage 120 is reduced, the oil return flow rate of the oil return passage 120 is reduced, and then the hydraulic pressure in the oil return passage 120 increases and reaches a new balance with the load mechanism. At this time, the power consumption of the transplanter will be correspondingly reduced due to the reduction of the oil return flow rate of the oil return passage 120, thereby reducing the use cost of the transplanter. Similarly, when the hydraulic pressure of the pressurized oil on the side where the pressure balance chamber 110 communicates with the oil return passage 120 is greater than the pressure value of the pressure balance mechanism 200 exerted by the load mechanism, the pressurized oil in the oil return passage 120 can push the pressure balance mechanism 200 to move away from the oil return passage 120 and increase the opening degree of the oil return passage 120. That is, when the load of the load mechanism decreases, the existing balance state of the pressure balance mechanism 200 is broken, and the load mechanism opens part of the oil return passage 120 by pushing the pressure balance mechanism 200, so that the opening degree of the oil return passage 120 is increased, the oil return flow rate of the oil return passage 120 is increased, and then the hydraulic pressure in the oil return passage 120 is reduced and reaches a new balance with the load mechanism. At this time, the working efficiency of the transplanter will be improved due to the increase of the oil return flow rate.

[0028] To facilitate the pressure balance mechanism 200 to control the flow rate of the pressurized oil in the oil return passage 120, in one embodiment, as Figure 1 and Figure 2As shown, the oil return passage 120 includes 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 degree of one of the first oil return section 121 and the second oil return section 122 to control the opening degree of the oil return passage 120. According to the short-board effect, the oil return flow rate of the oil return passage 120 depends on the part with the smallest inner diameter of the oil return passage 120. That is to say, the pressure balance mechanism 200 can control the opening degree of the entire oil return passage 120 by controlling the opening degree of the first oil return section 121. The pressure balance mechanism 200 can also control the opening degree of the entire oil return passage 120 by controlling the opening degree of the second oil return section 122. The pressure balance mechanism 200 can also control the opening degree of the entire oil return passage 120 by simultaneously controlling the opening degrees of the first oil return section 121 and the second oil return section 122. Thus, by dividing the oil return passage 120 into the separately arranged first oil return section 121 and the second oil return section 122, the pressure balance mechanism 200 can block the openings of part or all of the first oil return section 121 or the second oil return section 122 in the pressure balance chamber 110, thereby controlling the flow rate of the pressure oil in the oil return passage 120. That is, with such a setting, the control efficiency of the control valve is greatly improved.

[0029] To facilitate the rapid increase of the hydraulic pressure on the side of the pressure balance chamber 110 close to the oil return passage 120, thereby rapidly pushing the pressure balance mechanism 200. Further, in this embodiment, as Figure 1 and Figure 2 shown, the first oil return section 121 and the second oil return section 122 are arranged axially staggered along the pressure balance chamber 110, and the inner diameter of the second oil return section 122 is smaller than that of the first oil return section 121. The pressure balance mechanism 200 controls the opening degree of the second oil return section 122 to control the opening degree of the oil return passage 120. Thus, 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 beneficial to the rapid formation of a relatively 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 that of the first oil return section 121.

[0030] To reduce the structural complexity of the pressure balance mechanism 200, in one embodiment, as Figure 1 and Figure 2As shown, the pressure balance mechanism 200 includes a movable valve plug 210 and a one-way hydraulic valve 220. The movable valve plug 210 is movably disposed in the pressure balance chamber 110, and the movable valve plug 210 divides the pressure balance chamber 110. There is pressure oil 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 oil return passage 120 and reduces the opening degree of the oil return passage 120. It should be noted that the one-way hydraulic valve 220 is mainly connected to the load mechanism of the transplanter through pressure oil. Generally speaking, 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 oil return passage 120. However, it is not limited to this. In other embodiments, the movable valve plug 210 and the one-way hydraulic valve 220 may also be integrally formed.

[0031] Specifically, in one embodiment, as Figure 1 and Figure 2 shown, the one-way hydraulic valve 220 includes a valve seat 221, a movable plug 222 and a return elastic member 223. The valve seat 221 is provided with a hydraulic chamber 224. The movable plug 222 and the return elastic member 223 are both installed in the hydraulic chamber 224. One end of the return elastic member 223 is connected to the inner wall of the hydraulic chamber 224, and the other end is connected to the movable plug 222, so that the movable plug 222 applies a force to the movable valve plug 210 to move toward the side close to the oil return passage 120. The hydraulic chamber 224 on the side of the movable plug 222 close to the return elastic member 223 is used to fill the pressure oil connecting the load mechanism. In this way, the pressure oil at the load mechanism end can indirectly push the movable valve plug 210 to move by pushing the movable plug 222. Further, the return elastic member 223 is a compression spring. The compression spring is simple to manufacture and convenient to install, which is beneficial to reducing the manufacturing cost of the control valve. Furthermore, the movable plug 222 is a steel ball. The steel ball is simple to process and convenient to install, which 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 shown, the one-way hydraulic valve 220 further includes a stop projection 226. The stop projection 226 stops at the opening of the hydraulic chamber 224 on the side of the movable plug 222 away from the return elastic member 223 to stop the movable plug 222. In this way, the movement range of the movable plug 222 will be limited within the hydraulic chamber 224. When the one-way hydraulic valve 220 is disassembled and assembled, the valve seat 221, the movable plug 222 and the return elastic member 223 can be disassembled and assembled synchronously, greatly improving 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, asFigure 1 and Figure 2 As shown in Figure 2 , the stop projection 226 and the valve seat 221 are integrally formed. Specifically, the annular stop projection 226 and the valve seat 221 are directly machined by turning or casting processes.

[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 shown, a contact rod 211 is fixedly provided on the 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 is movably inserted through the hydraulic cavity 224 and abuts against the 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 shown, one end of the hydraulic cavity 224 away from the movable valve plug 210 has an assembly port 225. The movable plug 222 and the return elastic member 223 can be installed in the hydraulic cavity 224 through the assembly port 225. A high-pressure plug 228 is provided at the assembly port 225 to block the assembly port 225.

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

[0037] In order to avoid eccentricity of the movable valve plug 210 and improve the movement stability of the movable valve plug 210, in one embodiment, as Figure 1 and Figure 2 shown, the outer side wall of the movable valve plug 210 is in clearance fit with the inner wall of the pressure balance cavity 110. A plurality of annular grooves 212 are provided on the outer circumference 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 grooves 212 through the gap between the outer side wall of the movable valve plug 210 and the inner wall of the pressure balance cavity 110. Thus, it is beneficial to reduce the frictional resistance between the movable valve plug 210 and the inner wall of the pressure balance cavity 110 and improve the movement flexibility of the annular grooves 212. Moreover, the annular grooves 212 are filled with pressure oil. Under the pressure of the pressure oil, it is beneficial to avoid eccentricity of the movable valve plug 210 and improve the movement stability of the movable valve plug 210.

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

[0039] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0040] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A control valve, characterized in that, It includes a valve body (100) and a pressure balance mechanism (200). The valve body (100) is provided with a pressure balance chamber (110) and an oil return passage (120). The pressure balance mechanism (200) is movably arranged in the pressure balance chamber (110), and one end of the pressure balance chamber (110) communicates with the oil return passage (120). One end of the pressure balance mechanism (200) away from the oil return passage (120) is used to connect the load mechanism of the transplanter; When the hydraulic value of the pressure oil on the side where the pressure balance chamber (110) communicates with the oil return passage (120) is less than the pressure value exerted on the pressure balance mechanism (200) by the load mechanism, the pressure balance mechanism (200) can move towards the side close to the oil return passage (120), and reduce the opening degree of the oil return passage (120); When the hydraulic value of the pressure oil on the side where the pressure balance chamber (110) communicates with the oil return passage (120) is greater than the pressure value exerted on the pressure balance mechanism (200) by the load mechanism, the pressure oil in the oil return passage (120) can push the pressure balance mechanism (200) towards the side away from the oil return passage (120), and increase the opening degree of the oil return passage (120); The pressure balance 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 balance chamber (110), and the movable valve plug (210) divides the pressure balance chamber (110). There is pressure oil between the one-way hydraulic valve (220) and the load mechanism, and 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) towards the side close to the oil return passage (120), and reduces the opening degree of the oil return passage (120).

2. The control valve according to claim 1, characterized in that, 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 chamber (224). The movable plug (222) and the reset elastic member (223) are both arranged in the hydraulic chamber (224), and one end of the reset elastic member (223) is connected to the inner wall of the hydraulic chamber (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 towards the side close to the oil return passage (120). The hydraulic chamber (224) on the side of the movable plug (222) close to the reset elastic member (223) is used to fill the pressure oil connecting the load mechanism.

3. The control valve according to claim 2, wherein The one-way hydraulic valve (220) further includes a stop projection (226). The stop projection (226) 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).

4. The control valve according to claim 3, characterized in that, The stop projection (226) is integrally formed with the valve seat (221).

5. The control valve according to claim 2, characterized in that, One side of the movable valve plug (210) close to the one-way hydraulic valve (220) is fixedly provided with an abutting rod (211). The outer diameter of the abutting rod (211) is smaller than the outer diameter of the movable valve plug (210), and the abutting rod (211) is movably inserted through the hydraulic cavity (224) and abuts against the movable plug (222).

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

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

8. The control valve according to claim 1, wherein The outer side wall of the movable valve plug (210) is in clearance fit with the inner wall of the pressure balance cavity (110). A plurality of annular grooves (212) are provided on the outer circumference 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).

9. A transplanter, characterized in that, It includes a control valve according to any one of claims 1-8.

Images