Unloading valves for agricultural machinery and agricultural machinery

Abstract

This invention discloses an unloading valve for agricultural machinery and the agricultural machinery itself. The unloading valve includes a valve body and an unloading assembly. The valve body has an installation cavity and an unloading oil passage, with the inlet and outlet of the unloading oil passage connected to the installation cavity. The unloading assembly includes a valve stem and a sliding drive component. The valve stem is slidably disposed within the installation cavity, and the sliding drive component is disposed on the valve body and drivenly connected to the valve stem. The sliding drive component drives the valve stem to slide to open or close the inlet. A clearance gap is provided between the valve stem and the cavity wall of the installation cavity. This clearance gap allows impurities to enter and pass through, enabling them to be flushed along the installation cavity into the unloading oil passage and discharged during the process of oil scouring the clearance gap. This effectively prevents valve stem slippage and jamming caused by impurity accumulation, providing strong anti-pollution and impurity removal capabilities. It is suitable for agricultural operations involving a wide variety and large quantity of impurities, with continuous impurity intrusion.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic valve technology, specifically relating to an unloading valve for agricultural machinery and agricultural machinery. Background Technology

[0002] Harvesters typically employ plug-in unloading valves, which are inserted into the valve sleeve of a multi-way valve to achieve the unloading function of the hydraulic system. However, during agricultural operations in the field, dust, straw fragments, soil, and other impurities can intrude between the unloading valve and the valve sleeve. Tiny particles, if adhering to the sealing surface, can easily cause the unloading valve to jam or malfunction. Furthermore, the significant fluctuations in oil flow rate and pressure during harvester operation allow impurities to be further squeezed into the clearance under high speed and pressure, increasing the risk of jamming. In severe cases, this can prevent the hydraulic system from unloading properly, affecting harvesting efficiency.

[0003] Furthermore, because the valve sleeve in the plug-in structure is a closed design, impurities are difficult to expel after entering the gap and can only be deposited in the mating gap. As the operating time increases, the accumulated impurities will continue to wear down the unloading valve and the valve sleeve, resulting in a significant reduction in the service life of the unloading valve.

[0004] In summary, agricultural operating environments are characterized by a wide variety of impurities, large quantities, and persistent intrusion. These impurities tend to accumulate between the unloading valve and the valve sleeve and cannot be effectively discharged, revealing that existing unloading valves have insufficient anti-pollution capabilities and are ill-suited to agricultural operating conditions. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies, the present invention provides an unloading valve for agricultural machinery and agricultural machinery, aiming to solve the technical problem that the existing unloading valves have insufficient anti-pollution ability and are difficult to adapt to agricultural operation conditions.

[0006] To achieve the above objectives, the present invention provides an unloading valve for agricultural machinery, the unloading valve for agricultural machinery comprising: The valve body has an installation cavity and an unloading oil passage. The oil inlet and oil return port of the unloading oil passage are both connected to the installation cavity. The unloading assembly includes a valve stem and a sliding drive. The valve stem is slidably disposed in the mounting cavity, and the sliding drive is disposed on the valve body and drivenly connected to the valve stem. The sliding drive is used to drive the valve stem to slide to open or close the oil inlet, and there is a debris removal gap between the valve stem and the cavity wall of the mounting cavity.

[0007] In this embodiment of the invention, the size of the impurity removal gap is set to 0.010mm~0.013mm.

[0008] In this embodiment of the invention, the valve stem includes a stem body and multiple shoulders. The multiple shoulders are spaced apart on the stem body along the axial direction. Each shoulder has a waste discharge gap with the cavity wall of the mounting cavity. At least one shoulder is provided with a sludge collection groove, and the groove opening of the sludge collection groove is arranged facing the cavity wall of the mounting cavity.

[0009] In this embodiment of the invention, the shoulder on the rod corresponding to the oil inlet is called the oil inlet side shoulder. Multiple throttling grooves are provided on the oil inlet side shoulder at intervals in a circumferential manner. The throttling grooves are used to connect the oil inlet and the mounting cavity.

[0010] In this embodiment of the invention, a pressure equalization channel is provided inside the valve stem, and the two ends of the pressure equalization channel are respectively connected to the two ends of the mounting cavity.

[0011] In this embodiment of the invention, a pressure relief channel is provided inside the valve stem, which is used to connect the pressure equalization channel and the oil return port.

[0012] In this embodiment of the invention, the unloading oil passage includes an oil inlet section, an oil return section, and a connecting section. One end of the oil inlet section is provided with an oil inlet, and the other end of the oil inlet section is connected to the mounting cavity. One end of the oil return section is provided with an oil return outlet, and the other end of the oil return section is connected to the mounting cavity. Both ends of the connecting section are respectively connected to the mounting cavity.

[0013] In this embodiment of the invention, the valve body is provided with a plug-in interface, which is connected to the connecting section. The unloading valve for agricultural machinery also includes an overflow valve, which passes through the plug-in interface and is installed in the connecting section.

[0014] In this embodiment of the invention, the sliding drive component is an electromagnet, and the unloading assembly further includes a first reset spring and a second reset spring. The first reset spring is located between the electromagnet and the valve stem, and the second reset spring is located at the end of the valve stem away from the electromagnet.

[0015] To achieve the above objectives, the present invention also provides an agricultural machine, which includes a multi-way valve, comprising an unloading valve for agricultural machinery as described above.

[0016] Through the above technical solutions, the unloading valve for agricultural machinery and the agricultural machinery provided in the embodiments of the present invention have the following beneficial effects: In the technical solution of this invention, the valve stem is installed in the mounting cavity, and a clearance gap is formed between the valve stem and the cavity wall of the mounting cavity. The clearance gap allows impurities such as dust, soil, and straw fragments to enter and pass through, so that the impurities will not rub against the valve stem and the cavity wall of the mounting cavity when they enter the clearance gap. The impurities can be flushed along the mounting cavity into the unloading oil passage and discharged during the process of oil flushing the clearance gap. This effectively prevents the valve stem from slipping and getting stuck due to the accumulation of impurities. It has strong anti-pollution ability and impurity removal and slag removal ability, and is suitable for agricultural operation conditions with many types and large quantities of impurities and strong continuous impurity intrusion.

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

[0018] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a cross-sectional view of an unloading valve according to an embodiment of the present invention. Figure 2 yes Figure 1 Enlarged view of region A in the middle; Figure 3 This is a cross-sectional view of the unloading valve according to an embodiment of the present invention from another perspective; Figure 4 This is a cross-sectional view of the unloading valve from another perspective according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the valve stem in an unloading valve according to an embodiment of the present invention; Figure 6 yes Figure 5 Enlarged view of region B in the middle; Figure 7 This is a cross-sectional view of the valve stem from one perspective according to an embodiment of the present invention; Figure 8 This is a cross-sectional view of the valve stem from another perspective according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of a multi-way valve according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures Detailed Implementation

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

[0021] The unloading valve for agricultural machinery of the present invention is described below with reference to the accompanying drawings.

[0022] like Figures 1 to 3As shown, the present invention provides an unloading valve 100 for agricultural machinery. The unloading valve 100 includes a valve body 10 and an unloading assembly. The valve body 10 has an installation cavity 11 and an unloading oil passage 12. The oil inlet 121 and the oil return port 122 of the unloading oil passage 12 are both connected to the installation cavity 11. The unloading assembly includes a valve stem 20 and a sliding drive member 30. The valve stem 20 is slidably disposed in the installation cavity 11. The sliding drive member 30 is disposed on the valve body 10 and drivenly connected to the valve stem 20. The sliding drive member 30 is used to drive the valve stem 20 to slide to open or close the oil inlet 121. There is a debris discharge gap 80 between the valve stem 20 and the cavity wall of the installation cavity 11.

[0023] Specifically, the unloading valve 100 can be applied to the hydraulic system of agricultural machinery for unloading. The unloading valve 100 includes a valve body 10 with an installation cavity 11 and an unloading oil passage 12. The unloading oil passage 12 has an oil inlet 121 and an oil return port 122, both of which are used to communicate with an oil tank. The installation cavity 11 is provided through the unloading oil passage 12 to communicate with the oil inlet 121 and the oil return port 122 respectively. The unloading valve 100 also includes a valve stem 20 passing through the installation cavity 11 and a sliding drive member 30 driven by the valve stem 20. The sliding drive member 30 drives the valve stem 20 to slide within the installation cavity 11 to open or close the oil inlet 121. That is, when unloading is required, the sliding drive member 30 drives the valve stem 20 to slide to open the oil inlet 121, so that oil can flow from the oil inlet 121 into the unloading oil passage 12 and flow along the unloading oil passage 12 from... The oil flows out of the return port 122 into the oil tank to achieve unloading. After unloading, the sliding drive component 30 drives the valve stem 20 to slide to close the oil inlet 121, so that the oil cannot flow into the unloading oil passage 12. Furthermore, the valve stem 20 is installed in the mounting cavity 11, and a debris discharge gap 80 is formed between the valve stem 20 and the cavity wall of the mounting cavity 11. The debris discharge gap 80 allows impurities such as dust, soil, and straw fragments to enter and pass through, so that the impurities will not rub against the valve stem 20 and the cavity wall of the mounting cavity 11 when they enter the debris discharge gap 80. The impurities can be flushed along the mounting cavity 11 into the unloading oil passage 12 and discharged during the process of the oil flushing the debris discharge gap 80. This effectively prevents the valve stem 20 from sliding and getting stuck due to the accumulation of impurities. It has strong anti-pollution ability and debris removal and slag discharge ability, and is suitable for agricultural operation conditions with many types and large quantities of impurities and strong continuous impurity intrusion.

[0024] Furthermore, it should be noted that existing plug-in valve cores, in pursuit of low leakage and to meet the operational requirements of precise control actuators, typically have an assembly gap between the plug-in valve core and the valve sleeve that prevents impurities such as dust, mud, and straw fragments from passing through. When these existing plug-in valve cores are applied to agricultural operations, continuously invading impurities can easily become stuck between the plug-in valve core and the valve sleeve, causing unloading failure. In this embodiment of the invention, the impurity discharge gap 80 formed between the valve stem 20 and the cavity wall of the mounting cavity 11 allows impurities to enter and be discharged into the oil tank through the mounting cavity 11 and the unloading channel under the flushing action of the oil. This makes the unloading valve 100 effectively applicable to agricultural machinery operating in harsh environments. Moreover, the unloading valve 100 has its own valve body 10, which can achieve the unloading function by installing the valve body 10 into the multi-way valve 200 or valve group of agricultural machinery. This eliminates the need for the traditional plug-in valve core inserted into the valve sleeve of the multi-way valve 200, significantly improving the anti-pollution and self-cleaning reliability of the unloading valve 100 under highly polluted conditions.

[0025] In this embodiment of the invention, the size of the impurity removal gap 80 is set to 0.010mm~0.013mm, such as... Figure 2 As shown, the distance d between the shoulder 22 and the cavity wall of the mounting cavity 11 is set as the impurity discharge gap 80, where d = 0.010mm~0.013mm. If d is less than 0.010mm, impurities will easily rub against the valve stem 20 or the cavity wall of the mounting cavity 11, making it difficult for them to be discharged smoothly outside the impurity discharge gap 80. If d is greater than 0.013mm, the oil leakage will be too large, affecting the accuracy of the actuator. The unloading valve 100 sets the distance between the valve stem 20 and the cavity wall of the mounting cavity 11 to 0.010mm~0.013mm so that the impurity discharge gap 80 can allow impurities to pass through the mounting cavity 11 and be discharged when impurities enter, preventing impurities from rubbing against the valve stem 20 or the cavity wall of the mounting cavity 11, improving the smoothness of the valve stem 20 sliding, and thus improving the unloading reliability. Compared with the existing plug-in valve core, the unloading valve 100 is more suitable for the harsh operating environment of agricultural machinery.

[0026] In a preferred embodiment of the present invention, d = 0.011mm~0.012mm, that is, the size of the impurity discharge gap 80 is set to 0.011mm~0.012mm, so as to reduce the amount of oil leakage and improve the accuracy of the actuator while ensuring that impurities can pass smoothly through the impurity discharge gap 80.

[0027] Furthermore, it should be noted that existing plug-in valve cores require extremely high tightening torque during assembly. Excessive torque can cause plastic deformation of the valve sleeve or uneven fit clearance, even leading to localized jamming and directly causing sticking. Insufficient torque can cause oil leakage, and the valve core is prone to displacement, which can also cause sticking or delayed action. This not only increases the difficulty of assembly and maintenance but also raises manufacturing costs, making it unsuitable for the large-scale, low-cost production needs of agricultural machinery. In this embodiment of the invention, a debris removal gap 80 is provided between the valve stem 20 and the cavity wall of the mounting cavity 11, reducing assembly difficulty. Moreover, when using the unloading valve 100, assembly can be achieved by installing the valve body 10 into the multi-way valve 200 or valve group of agricultural machinery, omitting the steps of inserting and tightening the plug-in valve core, thus reducing usage costs and assembly difficulty.

[0028] In this embodiment of the invention, the valve stem 20 includes a stem body 21 and a plurality of shoulders 22. The plurality of shoulders 22 are spaced apart on the stem body 21 along the axial direction of the stem body 21. Each shoulder 22 has a waste discharge gap 80 between itself and the cavity wall of the mounting cavity 11. At least one shoulder 22 is provided with a sludge collection groove 221, and the groove opening of the sludge collection groove 221 is arranged facing the cavity wall of the mounting cavity 11.

[0029] like Figures 5 to 7 As shown, the rod 21 passes through the mounting cavity 11. The rod 21 has multiple spaced shoulders 22, each forming a clearance gap 80 between itself and the cavity wall of the mounting cavity 11. At least one shoulder 22 has a sludge collection groove 221 with its opening facing the cavity wall of the mounting cavity 11, allowing the sludge collection groove 221 to communicate with the clearance gap 80. During the sliding of the valve stem 20, when larger impurities such as soil and straw fragments enter the clearance gap 80, the oil flows along the unloading channel into the mounting cavity 11 and flushes the clearance gap 80, effectively preventing impurity accumulation. For smaller impurity particles that easily adhere to the shoulders 22, they can enter the sludge collection groove 221 communicating with the clearance gap 80 as the oil flows through it. The sludge collection groove 221 on the valve stem 20 collects and captures these impurities. This effectively prevents impurities from adhering to the surface of the shoulder 22. As the oil continuously scours the sludge collection tank 221 and the shearing force generated by the reciprocating sliding motion of the shoulder 22, the impurities in the sludge collection tank 221 are carried out and discharged to the outside of the mounting cavity 11, effectively avoiding the stagnation of impurities of various particle sizes and further improving the unloading reliability of the unloading valve 100. In addition, the sludge collection tank 221 also plays a role in balancing the circumferential hydraulic pressure of the valve stem 20, reducing the lateral clamping force and further improving the smoothness of the sliding of the valve stem 20.

[0030] In a preferred embodiment of the present invention, such as Figures 5 to 7As shown, each shoulder 22 is provided with at least one sludge collection groove 221. Multiple sludge collection grooves 221 are spaced apart along the axial direction of the rod body 21. Multiple sludge collection grooves 221 can collect and capture impurities, further reducing the possibility of valve stem 20 sliding and jamming, and improving the smoothness and stability of sliding.

[0031] In embodiments of the present invention, such as Figure 2 and Figure 6 As shown, the end of the shoulder 22 is provided with a clearance ramp 223. The clearance ramp 223 is inclined in a direction away from the cavity wall of the mounting cavity 11. The clearance ramp 223 plays the role of avoiding and guiding impurities, which is conducive to the smooth passage of oil carrying impurities through the impurity discharge gap 80, improving the reliability of impurity flushing, and further reducing the possibility of valve stem 20 slipping and jamming.

[0032] In this embodiment of the invention, the shoulder 22 on the rod body 21 corresponding to the oil inlet 121 is the oil inlet side shoulder 22a. The oil inlet side shoulder 22a is provided with a plurality of throttling grooves 222 arranged in a circumferential manner. The throttling grooves 222 are used to connect the oil inlet 121 and the mounting cavity 11.

[0033] like Figures 5 to 8 As shown, among the multiple shoulders 22 on the rod 21, one shoulder 22 corresponding to the oil inlet 121 is the oil inlet side shoulder 22a. When unloading is required, the sliding drive 30 drives the rod 21 to slide to the right, so that the rod 21 moves the oil inlet side shoulder 22a to the right and opens the oil inlet 121, allowing oil to flow from the oil inlet 121 into the unloading oil passage 12, and then flow out from the return oil port 122 into the oil tank to achieve unloading. After unloading is completed, the sliding drive 30 drives the rod 21 to slide to the left, so that the rod 21 moves the oil inlet side shoulder 22a to the left and closes the oil inlet 121. Multiple throttling grooves 222 are located at the left end of the oil inlet side shoulder 22a and are arranged circumferentially around the outer periphery of the oil inlet side shoulder 22a, so that the oil inlet side shoulder 22a can be opened and closed. During the process of closing the oil inlet 121, the oil flow rate of the oil-side shoulder 22a can be gradually reduced. That is, when the oil inlet 121 is opened, the oil can pass through the mounting cavity 11 and flow along the unloading oil passage 12. When the throttling groove 222 on the oil-side shoulder 22a moves to the left end of the oil inlet 121, the oil can flow into the mounting cavity 11 through the throttling groove 222, thus reducing the oil flow rate. When the oil-side shoulder 22a moves to block the oil inlet 121, the oil cannot enter. This achieves a gradual reduction in the oil flow rate during the process of closing the oil inlet 121. The throttling groove 222 plays a throttling and buffering role, allowing the oil inlet 121 to smoothly transition from the open state to the closed state. This avoids the sudden cut-off of the unloading oil passage 12, which would cause a cliff-like drop in the oil flow rate and effectively mitigate hydraulic shock.

[0034] In a preferred embodiment of the present invention, as shown in 6, both the sludge collection tank 221 and the throttling tank 222 are U-shaped, that is, both the sludge collection tank 221 and the throttling tank 222 have arc-shaped bottom walls to guide the oil flow and reduce dead angles, thereby preventing impurities from accumulating in the sludge collection tank 221 or the throttling tank 222. This facilitates the smooth flow of oil carrying impurities out of the sludge collection tank 221 or the throttling tank 222 along the arc-shaped bottom walls, further improving the self-cleaning capability of the unloading valve 100.

[0035] In this embodiment of the invention, a pressure equalization channel 211 is provided inside the valve stem 20, and the two ends of the pressure equalization channel 211 are respectively connected to the two ends of the mounting cavity 11. Figure 7 As shown, the two ends of the mounting cavity 11 are connected by the pressure equalization channel 211 in the rod body 21. The pressure equalization channel 211 plays the role of balancing the pressure at both ends of the mounting cavity 11, effectively preventing the valve stem 20 from shifting or slipping and getting stuck due to the pressure imbalance at both ends of the mounting cavity 11, and improving the smoothness of the valve stem 20's sliding.

[0036] Furthermore, a pressure relief channel 212 is provided inside the valve stem 20, which is used to connect the pressure equalization channel 211 and the oil return port 122. For example... Figure 7 As shown, the pressure equalization channel 211 and the oil return port 122 are both connected to the pressure relief channel 212, so that the oil in the pressure equalization channel 211 can flow into the pressure relief channel 212 and flow back to the oil tank through the oil return port 122 along the pressure relief channel 212. The pressure equalization channel 211 and the pressure relief channel 212 work together to balance the pressure at both ends of the mounting cavity 11 and relieve pressure, thereby improving the structural stability and reliability.

[0037] In this embodiment of the invention, the unloading oil passage 12 includes an oil inlet section 123, an oil return section 124, and a connecting section 125. One end of the oil inlet section 123 is provided with an oil inlet 121, and the other end of the oil inlet section 123 is connected to the mounting cavity 11. One end of the oil return section 124 is provided with an oil return port 122, and the other end of the oil return section 124 is connected to the mounting cavity 11. Both ends of the connecting section 125 are respectively connected to the mounting cavity 11.

[0038] like Figures 1 to 4As shown, the oil inlet section 123 is connected to one end of the connecting section 125 through the mounting cavity 11, and the other end of the connecting section 125 is connected to the oil return section 124 through the mounting cavity 11. When unloading is required, the sliding drive component 30 drives the rod body 21 to slide to the right, so that the rod body 21 drives the oil inlet side shoulder 22a to move to the right and open the oil inlet port 121, so that the oil can flow from the oil inlet port 121 into the oil inlet section 123, and flow along the oil inlet section 123 through the mounting cavity 11 into the connecting section 125. The oil flows through the connecting section 125 and through the mounting cavity 11. The oil enters the return section 124 and then flows back to the oil tank from the return port 122, thus unloading the hydraulic system. The connecting section 125 connects the inlet section 123 and the return section 124, ensuring smooth oil flow and improving unloading reliability. After unloading, the sliding drive component 30 drives the rod 21 to slide to the left, so that the rod 21 drives the inlet side shoulder 22a to move to the left and block the inlet section 123, thereby closing the inlet port 121 and cutting off the unloading oil passage 12, so that the oil can enter the actuator to drive the actuator to work.

[0039] In this embodiment of the invention, the valve body 10 is provided with a connector 13, which communicates with the connecting section 125. The agricultural machinery unloading valve 100 also includes an overflow valve 40, which passes through the connector 13 and is installed within the connecting section 125. Figure 1 and Figure 4 As shown, the overflow valve 40 extends from the insertion port 13 into the connecting section 125. The overflow valve 40 plays a role in maintaining pressure during the unloading process, reducing the unloading impact, effectively preventing overload, and further improving the unloading stability.

[0040] In this embodiment of the invention, the sliding drive 30 is an electromagnet, and the unloading assembly further includes a first reset spring 50 and a second reset spring 70. The first reset spring 50 is located between the electromagnet and the valve stem 20, and the second reset spring 70 is located at the end of the valve stem 20 away from the electromagnet.

[0041] like Figures 1 to 3As shown, the mounting cavity 11 passes through the valve body 10. One end of the mounting cavity 11 is equipped with an electromagnet, and a first return spring 50 is provided between the electromagnet and the valve stem 20. The other end of the mounting cavity 11 is equipped with a sealing head 60, and a second return spring 70 is provided between the sealing head 60 and the valve stem 20. When the electromagnet is de-energized, the second return spring 70 acts on the valve stem 20, causing the valve stem 20 to slide to the right to open the oil inlet 121, thereby connecting the oil inlet 121 and the oil return port 122 through the unloading oil passage 12 for unloading. When the electromagnet is energized... In this case, both the electromagnet and the first return spring 50 can drive the valve stem 20 to slide to the left to close the oil inlet 121, thereby cutting off the unloading oil passage 12. The oil can then flow into the actuator to drive its operation. The sliding motion of the valve stem 20 is driven by the electromagnet, which has the advantages of fast response speed and high control accuracy. It abandons the passive and follow-up method of the traditional pilot hydraulic control valve stem 20 movement, avoids response lag and hydraulic shock caused by pressure fluctuations, oil contamination or hydraulic resistance changes in the pilot oil circuit, and improves the unloading response speed and unloading stability.

[0042] In embodiments of the present invention, such as Figure 7 As shown, the pressure equalization channel 211 includes an extension section 2111 and a bending section 2112. The extension section 2111 extends axially along the rod body 21. One end of the extension section 2111 is connected to the mounting cavity 11, and the other end of the extension section 2111 is connected to the bending section 2112. The bending section 2112 extends radially along the rod body 21 and is connected to the mounting cavity 11, so that the two ends of the mounting cavity 11 can be connected through the extension section 2111 and the bending section 2112, which plays a role in balancing the pressure in the mounting cavity 11. The bending section 2112 is perpendicular to the extension section 2111 to avoid the first return spring 50, which makes it easier to place the first return spring 50 between the valve stem 20 and the electromagnet, thus improving the ease of assembly.

[0043] Furthermore, such as Figures 1 to 3 As shown, the mounting cavity 11 is installed through the valve body 10, the electromagnet is located at one end of the mounting cavity 11, and the sealing head 60 is detachably located at the other end of the mounting cavity 11, which facilitates the installation and maintenance of the valve stem 20 and further improves the ease of assembly.

[0044] In addition, the present invention also provides an agricultural machine, which includes a multi-way valve 200, the multi-way valve 200 including an unloading valve 100 for agricultural machinery as described above, and the specific structure of the unloading valve 100 refers to the above embodiments. Since the multi-way valve 200 and the agricultural machine adopt all the technical solutions of the above embodiments, they have at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0045] In embodiments of the present invention, such as Figure 9As shown, the multi-way valve 200 also includes multiple working links 201. The unloading valve 100 is located in the first link of the multi-way valve 200 near the oil tank of the agricultural machinery. Impurities are more concentrated in the oil tank, and they can easily enter the unloading valve 100. The unloading valve 100 discharges impurities to the outside of the unloading valve 100 by setting a discharge gap 80 between the valve stem 20 and the cavity wall of the mounting cavity 11, thereby improving the smoothness and stability of the oil flow in the multi-way valve 200.

[0046] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An unloading valve for an agricultural machine, characterized by, The unloading valve (100) for agricultural machinery includes: The valve body (10) has an installation cavity (11) and an unloading oil passage (12) inside. The oil inlet (121) and oil return (122) of the unloading oil passage (12) are both connected to the installation cavity (11). The unloading assembly includes a valve stem (20) and a sliding drive (30). The valve stem (20) is slidably disposed in the mounting cavity (11). The sliding drive (30) is disposed on the valve body (10) and drivenly connected to the valve stem (20). The sliding drive (30) is used to drive the valve stem (20) to slide to open or close the oil inlet (121). There is a debris discharge gap (80) between the valve stem (20) and the cavity wall of the mounting cavity (11).

2. The unloading valve for an agricultural machine according to claim 1, characterized by The size of the impurity discharge gap (80) is set to 0.010mm~0.013mm.

3. The unloading valve for an agricultural machine according to claim 1, characterized by, The valve stem (20) includes a stem body (21) and a plurality of shoulders (22). The plurality of shoulders (22) are spaced apart on the stem body (21) along the axial direction. Each shoulder (22) has a discharge gap (80) between itself and the cavity wall of the mounting cavity (11). At least one shoulder (22) is provided with a sludge collection groove (221), and the groove opening of the sludge collection groove (221) is arranged facing the cavity wall of the mounting cavity (11).

4. The unloading valve for an agricultural machine according to claim 3, characterized by The shoulder (22) on the rod (21) corresponding to the oil inlet (121) is the oil inlet side shoulder (22a). The oil inlet side shoulder (22a) is provided with a plurality of throttling grooves (222) arranged in a circumferential interval. The throttling grooves (222) are used to connect the oil inlet (121) and the mounting cavity (11).

5. The unloading valve for agricultural machinery according to any one of claims 1 to 4, characterized in that, The valve stem (20) has a pressure equalization channel (211) inside, and the two ends of the pressure equalization channel (211) are respectively connected to the two ends of the mounting cavity (11).

6. The unloading valve for agricultural machinery according to claim 5, characterized in that, The valve stem (20) has a pressure relief channel (212) inside, which is used to connect the pressure equalization channel (211) and the oil return port (122).

7. The unloading valve for agricultural machinery according to any one of claims 1 to 4, characterized in that, The unloading oil passage (12) includes an oil inlet section (123), an oil return section (124), and a connecting section (125). One end of the oil inlet section (123) is provided with the oil inlet port (121), and the other end of the oil inlet section (123) is connected to the mounting cavity (11). One end of the oil return section (124) is provided with the oil return port (122), and the other end of the oil return section (124) is connected to the mounting cavity (11). Both ends of the connecting section (125) are connected to the mounting cavity (11).

8. The unloading valve for agricultural machinery according to claim 7, characterized in that, The valve body (10) is provided with a plug-in interface (13), which is connected to the connecting section (125). The agricultural machinery unloading valve (100) also includes an overflow valve (40), which passes through the plug-in interface (13) and is installed in the connecting section (125).

9. The unloading valve for agricultural machinery according to any one of claims 1 to 4, characterized in that, The sliding drive component (30) is an electromagnet, and the unloading assembly further includes a first reset spring (50) and a second reset spring (70). The first reset spring (50) is located between the electromagnet and the valve stem (20), and the second reset spring (70) is located at the end of the valve stem (20) away from the electromagnet.

10. An agricultural machine, characterized in that, The agricultural machinery includes a multi-way valve (200), which includes an unloading valve (100) for agricultural machinery according to any one of claims 1 to 9.

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