Dual fluid charging valve system and tractor

Abstract

The application relates to a double-path liquid charging valve system and a tractor, relates to the technical field of agricultural equipment, and optimizes the structure of a liquid charging valve to a certain extent, meets the requirements of providing stable supply for tractor braking and providing supply for other control systems of the tractor. The double-path liquid charging valve system comprises an oil supply port, a signal oil port, an oil return port, a bypass oil port, a main valve core, a control valve core, a first accumulator and a second accumulator; the oil supply port is connected with the main valve core; when the control valve core is located at a first position, the main valve core is located at a first position, the oil supply port is connected with the signal oil port through the main valve core and the control valve core, and a first oil outlet of the main valve core is connected with the first accumulator and the second accumulator; when the first accumulator and the second accumulator are full, pressure is applied to a first pressure sensing oil port of the control valve core, the control valve core is changed to a second position, the signal oil port is connected with the oil return port, the main valve core is changed to the second position, and a second oil outlet of the main valve core is connected with the bypass oil port.

Description

Technical Field

[0001] This application relates to the field of agricultural equipment, and more specifically, to a dual-channel filling valve system and a tractor. Background Technology

[0002] With the continuous improvement of agricultural mechanization, tractors, as an important piece of equipment in modern agriculture, directly affect agricultural production efficiency and safety through their performance and reliability. The tractor's braking system is one of its key components, affecting the overall operational safety and stability of the machine.

[0003] Modern tractors generally employ hydraulic braking systems, which transmit braking force through hydraulic oil to achieve wheel braking. During tractor operation, especially under conditions such as heavy-load transport or driving on slopes, the large mass and inertia of the tractor, coupled with relatively high operating speeds, place higher demands on the performance of the braking system. Existing hydraulic braking systems typically rely on a main hydraulic pump to provide braking pressure, which can meet conventional braking needs under normal operating conditions.

[0004] For emergency braking systems, some high-end tractors are equipped with brake accumulators as a backup oil source. These accumulators generally employ a low-pressure control system, storing a certain amount of hydraulic oil to provide braking force in emergencies. However, in practical applications, the emergency braking pressure of this low-pressure control system is often insufficient, especially under high-speed or heavy-load conditions, making it difficult to provide adequate braking force. Furthermore, existing system designs lack efficient filling valve assemblies, resulting in slow accumulator filling speeds and an inability to quickly replenish hydraulic oil, thus affecting the response speed of the emergency braking system.

[0005] Therefore, there is an urgent need to provide a dual-channel liquid filling system and tractor to compensate for the shortcomings of the existing technology to a certain extent. Utility Model Content

[0006] The purpose of this application is to provide a dual-channel filling valve system and a tractor, which optimizes the structure of the dual-channel filling valve system to a certain extent, makes the structure of the dual-channel filling valve system simpler, and achieves fixed throttling control.

[0007] To achieve the above objectives, the present invention provides a dual-channel filling valve system, comprising an oil supply port, a signal oil port, a return oil port, a bypass oil port, a main valve core, a control valve core, a first accumulator, and a second accumulator. The oil supply port is connected to the main valve core. When the control valve core is in the first position, the main valve core is also in the first position. The oil supply port is connected to the signal oil port via the main valve core and the control valve core. The first oil outlet of the main valve core is connected to the first accumulator and the second accumulator. When the first accumulator and the second accumulator are fully filled, pressure is applied to the first pressure-sensing oil port of the control valve core, causing the control valve core to change to the second position. The signal oil port is connected to the return oil port, the main valve core changes to the second position, and the second oil outlet of the main valve core is connected to the bypass oil port.

[0008] The main valve core includes a main valve body and a first spring cavity; the main valve body has a first pressure oil port and a second pressure oil port, the oil supply port is connected to the oil inlet of the main valve body and the first pressure oil port respectively, the second pressure oil port and the first pressure oil port are arranged opposite to each other at both ends of the main valve body, and the first spring cavity and the second pressure oil port are located at the same end of the main valve body.

[0009] Specifically, the main valve body also has a first port, a second port, a third port, and a fourth port; when the main valve body is in the first position, the oil inlet of the main valve body is connected to the first port and disconnected from the second port, and the first port is connected to the first accumulator and the second accumulator respectively; when the main valve body is in the second position, the oil inlet of the main valve body is connected to both the third port and the fourth port, and the third port is connected to the first accumulator and the second accumulator respectively, and the fourth port is connected to the bypass port.

[0010] Furthermore, the control valve core includes a control valve body and a second spring cavity; the control valve body also forms a second pressure-sensing oil port, the first pressure-sensing oil port and the second spring cavity are disposed opposite to each other at both ends of the control valve body, and the second pressure-sensing oil port and the second spring cavity are located at the same end of the control valve body.

[0011] Furthermore, the control valve body has a first oil port, a second oil port, a third oil port, a fourth oil port, a fifth oil port, and a sixth oil port. When the control valve body is in the first position, the first port is connected to the first oil port, the first oil port is connected to the second oil port, the second oil port is connected to the second pressure oil port of the main valve body, and the first oil port is disconnected from the third oil port. When the control valve body is in the second position, the fourth oil port is connected to the sixth oil port, the fifth oil port is disconnected from the sixth oil port, the second pressure oil port and the signal oil port are connected to the return oil port through the fifth oil port and the sixth oil port, and the sixth oil port is connected to the second pressure-sensing oil port.

[0012] The dual-channel filling system provided by this utility model includes a main filling oil circuit, a first filling oil circuit, a second filling oil circuit, a first connecting oil circuit, a second connecting oil circuit, and a third connecting oil circuit. One end of the main filling oil circuit is connected to the main valve body, and the other end is connected to the first filling oil circuit and the second filling oil circuit respectively. The first filling oil circuit is connected to the first accumulator, and the second filling oil circuit is connected to the second accumulator. One end of the first connecting oil circuit is connected to the main filling oil circuit, and the other end is connected to the control valve body. One end of the second connecting oil circuit is connected to the control valve body, and the other end is connected to the second pressure oil port and the signal oil port respectively. One end of the third connecting oil circuit is connected to the control valve body, and the other end is connected to the return oil port and the second pressure sensing oil port respectively.

[0013] Specifically, the dual-channel filling system provided by this utility model further includes a first one-way valve, a second one-way valve, and a third one-way valve. The first one-way valve is disposed on the main filling oil circuit, allowing the oil to flow from the main valve body to the first accumulator and the second accumulator. The second one-way valve is disposed on the first filling oil circuit and the second filling oil circuit, preventing the oil from flowing back from the first accumulator and the second accumulator.

[0014] Furthermore, the dual-channel filling system provided by this utility model also includes a first test port and a bypass port; one end of the bypass port is connected to the main valve core, and the other end is connected to the bypass port and the first test port respectively.

[0015] Furthermore, the dual-channel filling system provided by this utility model also includes a second test port and a test oil circuit; one end of the test oil circuit is connected to the main filling oil circuit, and the other end is connected to the second test port.

[0016] Compared with existing technologies, the dual-channel filling valve system provided by this utility model has the following advantages:

[0017] The dual-channel filling valve system provided by this utility model includes an oil supply port, a signal oil port, a return oil port, a bypass oil port, a main valve core, a control valve core, a first accumulator, and a second accumulator. The oil supply port is connected to the main valve core. When the control valve core is in the first position, the main valve core is also in the first position. The oil supply port is connected to the signal oil port through the main valve core and the control valve core. The first oil outlet of the main valve core is connected to the first accumulator and the second accumulator. When the first accumulator and the second accumulator are full, the pressure acts on the first pressure-sensing oil port of the control valve core, causing the control valve core to change to the second position. The signal oil port is connected to the return oil port, the main valve core changes to the second position, and the second oil outlet of the main valve core is connected to the bypass oil port.

[0018] Analysis shows that the dual-channel filling system provided in this application can adjust the state of the main valve core by controlling the valve core. In actual operation, when the oil enters the system from the oil supply port, it can first enter the main valve core. In the initial state, the main valve core is in the first position, so that the oil can enter the first accumulator and the second accumulator respectively through the first oil outlet of the main valve core.

[0019] Once the first and second accumulators are full, no more oil can enter them. This allows the oil entering the system to act on the first pressure-sensing port of the control valve core. As the pressure at the first pressure-sensing port increases, the control valve core changes from its first position to its second position. Because the control valve core in the second position connects the signal port and the return port, the main valve core changes from its first position to its second position. Therefore, the oil entering the main valve core from the supply port flows from the second outlet to the bypass port, while the oil flowing out of the first outlet remains within the system to provide pressure to the first pressure-sensing port of the control valve core. Therefore, the system provided in this application not only fills the first and second accumulators during the filling process, enabling the tractor to obtain corresponding brake oil pressure through the first and second accumulators during braking, thus ensuring braking stability and improving driving safety to a certain extent, but also allows the oil to be discharged through the bypass port after filling, providing pressurized oil to the control systems of other tractors, making the overall system operation more stable.

[0020] When the tractor brakes, the oil in the first and second accumulators is consumed. The oil in the system then re-enters the first and second accumulators, thereby reducing the pressure at the first pressure-sensing port. This causes the control valve core to change from the second position to the first position, and the main valve core to change from the second position to the first position. At this time, the main valve core is disconnected from the bypass port, allowing the oil to quickly enter the first and second accumulators, thus filling the accumulators.

[0021] In addition, this utility model also provides a tractor including the above-mentioned dual-channel filling valve system.

[0022] Tractors employing the dual-channel filling valve system provided in this application can obtain a stable supply of brake pressure oil using the first and second accumulators included in the filling valve system, thereby ensuring the stability and safety of the tractor during operation. Furthermore, since this application provides two independent filling lines and accumulators, even if one accumulator or line fails, the other can still provide braking power, thus ensuring the overall reliability of the equipment. Moreover, the dual-channel filling valve system provided in this application can also be used to connect the front and rear axles of the tractor separately, allowing each axle to receive an independent braking supply, further improving braking reliability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the dual-channel filling valve system provided in the embodiments of this application in the filling state;

[0025] Figure 2 This is a schematic diagram of the dual-channel filling valve system provided in the embodiment of this application in the state after filling is completed.

[0026] Icons: 1-Main valve core; 101-Valve body; 1011-First port; 1012-Second port; 1013-Third port; 1014-Fourth port; 1015-Oil inlet; 1016-First pressure port; 1017-Second pressure port; 102-First spring chamber; 2-Control valve core; 201-Control valve body; 2011-First port; 2012-Second port; 2013-Third port; 2014-Fourth port; 2015-Fifth port; 2016-Sixth port; 2017-First pressure sensing port. Oil port; 2018 - Second pressure sensing oil port; 202 - Second spring chamber; 3 - Main filling oil circuit; 301 - First check valve; 4 - First filling oil circuit; 401 - Second check valve; 5 - Second filling oil circuit; 501 - Third check valve; 6 - First connecting oil circuit; 7 - Second connecting oil circuit; 8 - Third connecting oil circuit; 9 - Bypass oil circuit; 901 - Bypass oil port; 10 - Oil supply port; 11 - Signal oil port; 12 - Oil return port; 13 - First test oil port; 14 - Second test oil port; 15 - First accumulator; 16 - Second accumulator. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] like Figure 1 Combination Figure 2 As shown, the dual-channel filling valve system provided in this application includes an oil supply port 10, a signal oil port 11, a return oil port 12, a bypass oil port 901, a main valve core 1, a control valve core 2, a first accumulator 15, and a second accumulator 16. The oil supply port 10 is connected to the main valve core 1. When the control valve core 2 is in the first position, the main valve core 1 is also in the first position. The oil supply port 10 is connected to the signal oil port 11 through the main valve core 1 and the control valve core 2. The first oil outlet of the main valve core 1 is connected to the first accumulator 15 and the second accumulator 16, respectively. When the first accumulator 15 and the second accumulator 16 are full, the pressure acts on the first pressure-sensing oil port 2017 of the control valve core 2, causing the control valve core 2 to change to the second position. The signal oil port 11 is connected to the return oil port 12, the main valve core 1 changes to the second position, and the second oil outlet of the main valve core 1 is connected to the bypass oil port 901.

[0031] Compared with existing technologies, the dual-channel filling valve system provided by this utility model has the following advantages:

[0032] The dual-channel filling valve system provided by this utility model can adjust the state of the main valve core 1 by controlling the valve core 2. That is, in actual operation, when the oil enters the system from the oil supply port 10, it can first enter the main valve core 1. In the initial state, the main valve core 1 is located in the first position, so that the oil can enter the first accumulator 15 and the second accumulator 16 through the first oil outlet of the main valve core 1 respectively.

[0033] When the first accumulator 15 and the second accumulator 16 are full, the oil cannot further enter them. This allows the oil entering the system to act on the first pressure-sensing port 2017 of the control valve core 2. As the pressure at the first pressure-sensing port 2017 increases, the control valve core 2 will change from the first position to the second position. Since the control valve core 2 in the second position connects the signal port 11 and the return port 12, and the main valve core 1 changes from the first position to the second position, the oil entering the main valve core 1 from the supply port 10 will flow from the second outlet to the bypass port 901, while the oil flowing out of the first outlet remains within the system to provide pressure to the first pressure-sensing port 2017 of the control valve core 2. Therefore, the system provided in this application can not only fill the first accumulator 15 and the second accumulator 16 with fluid during the filling process, enabling the entire tractor to obtain corresponding brake oil pressure through the first accumulator 15 and the second accumulator 16 when braking, thereby ensuring braking stability and improving driving safety to a certain extent, but also, after filling is completed, the oil can be discharged through the bypass port 901 to provide pressurized oil to the control systems of other tractors, making the operation of the overall system more stable.

[0034] When the tractor brakes, the oil in the first accumulator 15 and the second accumulator 16 is consumed. The oil in the system then re-enters the first accumulator 15 and the second accumulator 16, thereby reducing the pressure at the first pressure-sensing port 2017. The control valve core 2 changes from the second position to the first position, causing the main valve core 1 to change from the second position to the first position. At this time, the main valve core 1 is disconnected from the bypass port 901, allowing the oil to quickly enter the first accumulator 15 and the second accumulator 16, thus charging the accumulators.

[0035] Optionally, such as Figure 1 Combination Figure 2 As shown, the main valve core 1 in this application includes a main valve body 101 and a first spring cavity 102; the main valve body 101 has a first pressure oil port 1016 and a second pressure oil port 1017, and the oil supply port 10 is connected to the oil inlet 1015 and the first pressure oil port 1016 of the main valve body 101 respectively. The second pressure oil port 1017 and the first pressure oil port 1016 are arranged opposite to each other at both ends of the main valve body 101, and the first spring cavity 102 and the second pressure oil port 1017 are located at the same end of the main valve body 101.

[0036] In this application, the first spring cavity 102 and the first pressure port 1016 are disposed opposite to each other at both ends of the main valve body 101. At the same time, the second pressure port 1017 is located at the same end as the first spring cavity 102. Therefore, when the control valve core 2 is in the first position, the oil will pass through the control valve core 2 to the second pressure port 1017. Thus, one end of the first spring cavity 102 of the main valve core 1 receives the pressure of the oil and the thrust of the spring in the first spring cavity 102. It can be understood that since the oil supply port 10 is connected to the first pressure port 1016 in this application, the end of the main valve core 1 away from the first spring cavity 102 always receives the oil inlet pressure of the first pressure port 1016. When the second pressure port 1017 has pressurized oil, the force at the spring cavity end of the main valve core 1 is greater than the force at the first pressure port 1016 end, thereby keeping the main valve core 1 in the first position and allowing all the oil to be quickly charged into the first accumulator 15 and the second accumulator 16.

[0037] When the first accumulator 15 and the second accumulator 16 are full, the pressure oil no longer enters the first accumulator 15 and the second accumulator 16, but acts on the first pressure-sensing oil port 2017 of the control valve core 2, thereby causing the control valve core 2 to change from the first position to the second position, and thus the second pressure oil port 1017 no longer receives pressure oil. Therefore, the pressure of the first pressure oil port 1016 will overcome the thrust of the first spring chamber 102, causing the main valve core 1 to change from the first position to the second position, thereby realizing the function of supplying oil to the bypass oil port 901.

[0038] Optionally, such as Figure 2 As shown, the main valve body 101 in this application also has a first port 1011, a second port 1012, a third port 1013, and a fourth port 1014. When the main valve body 101 is in the first position, the oil inlet 1015 of the main valve body 101 is connected to the first port 1011 and disconnected from the second port 1012. The first port 1011 is connected to the first accumulator 15 and the second accumulator 16 respectively. When the main valve body 101 is in the second position, the oil inlet 1015 of the main valve body 101 is connected to both the third port 1013 and the fourth port 1014. The third port 1013 is connected to the first accumulator 15 and the second accumulator 16 respectively, and the fourth port 1014 is connected to the bypass port 901.

[0039] In this application, both the main valve core 1 and the control valve core 2 are two-position three-way valves. In the first position, the oil inlet 1015 is connected to the first port 1011 and disconnected from the second port 1012. In the second position, the oil inlet 1015 is connected to the third port 1013 and the fourth port 1014 respectively. Thus, oil can be supplied to the first accumulator 15 and the second accumulator 16 through the third port 1013, thereby continuously supplying oil to the first pressure-sensing oil port 2017 of the control valve core 2 and ensuring the stability of the overall system.

[0040] Optionally, such as Figure 1 Combination Figure 2 As shown, the control valve core 2 in this application includes a control valve body 201101 and a second spring cavity 202; the control valve body 201101 also forms a second pressure-sensing oil port 2018, the first pressure-sensing oil port 2017 and the second spring cavity 202 are disposed opposite to each other at both ends of the control valve body 201101, and the second pressure-sensing oil port 2018 and the second spring cavity 202 are located at the same end of the control valve body 201101.

[0041] The second spring chamber 202 can apply pressure to the control valve body 201101, so that when the pressure oil pressure of the first pressure oil port 1016 is insufficient, the control valve body 201101 can be kept in the first position, and when the first pressure oil port 1016 obtains oil pressure, it can overcome the thrust applied by the second spring chamber 202, thereby causing the control valve body 201101 to change from the first position to the second position.

[0042] When the control valve core 2 is turned to the second position, the second pressure-sensing oil port 2018 will receive pressurized oil, which can work together with the second spring chamber 202 to control the valve body 201101. When the pressure of the first pressure-sensing oil port 2017 decreases, the second pressure-sensing oil port 2018 and the second spring chamber 202 work together to push the control valve core 2 to the first position, realizing the automatic control of the entire system.

[0043] Optionally, such as Figure 2As shown, the control valve body 201101 in this application has a first oil port 2011, a second oil port 2012, a third oil port 2013, a fourth oil port 2014, a fifth oil port 2015, and a sixth oil port 2016. When the control valve body 201101 is in the first position, the first port 1011 is connected to the first oil port 2011, the first oil port 2011 is connected to the second oil port 2012, and the second oil port 2012 is connected to the second pressure oil port 1 of the main valve body 101. 017 is connected, and the first oil port 2011 is disconnected from the third oil port 2013; when the control valve body 201101 is in the second position, the fourth oil port 2014 is connected to the sixth oil port 2016, the fifth oil port 2015 is disconnected from the sixth oil port 2016, the second pressure oil port 1017 and the signal oil port 11 are connected to the return oil port 12 through the fifth oil port 2015 and the sixth oil port 2016, and the sixth oil port 2016 is connected to the second pressure sensing oil port 2018.

[0044] It is understood that the dual-channel filling system provided by this utility model includes a main filling oil circuit 3, a first filling oil circuit 4, a second filling oil circuit 5, a first connecting oil circuit 6, a second connecting oil circuit 7, and a third connecting oil circuit 8; one end of the main filling oil circuit 3 is connected to the main valve body 101, and the other end is connected to the first filling oil circuit 4 and the second filling oil circuit 5 respectively; the first filling oil circuit 4 is connected to the first accumulator 15, and the second filling oil circuit 5 is connected to the second accumulator 16; one end of the first connecting oil circuit 6 is connected to the main filling oil circuit 3, and the other end is connected to the control valve body 201101; one end of the second connecting oil circuit 7 is connected to the control valve body 201101, and the other end is connected to the second pressure port 1017 and the signal port 11 respectively; one end of the third connecting oil circuit 8 is connected to the control valve body 201101, and the other end is connected to the return oil port 12 and the second pressure sensing port 2018 respectively.

[0045] When the control valve core 2 is in the first position, the first oil port 2011 is connected to the second oil port 2012. The second oil port 2012 in this application is connected to the second pressure oil port 1017. Therefore, the oil flowing out of the main valve body 101 enters the main filling oil circuit 3 and the first connecting oil circuit 6 simultaneously. The oil in the first connecting oil circuit 6 can enter the control valve core 2 and reach the second pressure oil port 1017 through the second connecting oil circuit 7.

[0046] When the control valve core 2 is in the second position, the fourth oil port 2014 is connected to the sixth oil port 2016, and the fifth oil port 2015 is disconnected from the sixth oil port 2016. Therefore, the oil in the first connecting oil passage 6 cannot flow. The oil in the second pressure oil port 1017 will enter the control valve core 2 through the second connecting oil passage 7. The oil in the signal oil port 11 enters the fourth oil port 2014 and flows through the sixth oil port 2016 into the third connecting oil passage 8 and the return oil port 12. At the same time, the main valve core 1 changes from the first position to the second position, realizing the connection with the bypass oil passage 9.

[0047] Preferably, such as Figure 1 Combination Figure 2 As shown, the dual-channel filling system provided by this utility model also includes a first one-way valve 301, a second one-way valve 401, and a third one-way valve 501. The first one-way valve 301 is disposed on the main filling oil circuit 3, so that the oil flows from the main valve body 101 to the first accumulator 15 and the second accumulator 16. The second one-way valve 401 is disposed on the first filling oil circuit 4 and the second filling oil circuit 5, so as to prevent the oil from flowing back from the first accumulator 15 and the second accumulator 16.

[0048] Optionally, such as Figure 1 Combination Figure 2 As shown, the dual-channel filling system provided by this utility model also includes a first test oil port 13 and a bypass oil circuit 9; one end of the bypass oil circuit 9 is connected to the main valve core 1, and the other end is connected to the bypass oil port 901 and the first test oil port 13 respectively.

[0049] The oil pressure of the bypass oil circuit 9 can be tested through the first test port 13 to ensure the pressure stability of the overall system operation.

[0050] Optionally, such as Figure 1 Combination Figure 2 As shown, the dual-channel filling system provided by this utility model also includes a second test oil port 14 and a test oil circuit; one end of the test oil circuit is connected to the main filling oil circuit 3, and the other end is connected to the second test oil port 14.

[0051] The test oil circuit can be connected to the second test oil port 14, and the oil level of the main filling oil circuit 3 can be detected through the second test oil port 14, thereby further ensuring the pressure stability of the overall system operation.

[0052] In addition, this utility model also provides a tractor including the above-mentioned dual-channel filling valve system.

[0053] Tractors employing the dual-channel filling valve system provided in this application can obtain a stable supply of brake pressure oil using the first accumulator 15 and the second accumulator 16 included in the filling valve system, thereby ensuring the stability and safety of the tractor during operation. Furthermore, since this application provides two independent filling lines and accumulators, even if one accumulator or line fails, the other can still provide braking power, thus ensuring the overall reliability of the equipment. Moreover, the dual-channel filling valve system provided in this application can also be used to connect the front and rear axles of the tractor separately, allowing the front and rear axles to receive independent braking supplies, which also improves braking reliability.

[0054] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-channel filling valve system, characterized in that, It includes an oil supply port, a signal oil port, an oil return port, a bypass oil port, a main valve core, a control valve core, a first accumulator, and a second accumulator; The oil supply port is connected to the main valve core. When the control valve core is in the first position, the main valve core is in the first position. The oil supply port is connected to the signal oil port through the main valve core and the control valve core. The first oil outlet of the main valve core is connected to the first accumulator and the second accumulator respectively. When the first accumulator and the second accumulator are fully charged, the pressure is applied to the first pressure-sensing port of the control valve core, causing the control valve core to change to the second position. The signal port is connected to the return port, the main valve core changes to the second position, and the second outlet port of the main valve core is connected to the bypass port.

2. The dual-channel filling valve system according to claim 1, characterized in that, The main valve core includes a main valve body and a first spring cavity; The main valve body has a first pressure port and a second pressure port. The oil supply port is connected to the oil inlet of the main valve body and the first pressure port, respectively. The second pressure port and the first pressure port are arranged opposite to each other at both ends of the main valve body, and the first spring cavity and the second pressure port are located at the same end of the main valve body.

3. The dual-channel filling valve system according to claim 2, characterized in that, The main valve body also has a first port, a second port, a third port and a fourth port; When the main valve body is in the first position, the oil inlet of the main valve body is connected to the first port and disconnected from the second port. The first port is connected to the first accumulator and the second accumulator respectively. When the main valve body is in the second position, the oil inlet of the main valve body is simultaneously connected to the third port and the fourth port, and the third port is connected to the first accumulator and the second accumulator respectively, and the fourth port is connected to the bypass port.

4. The dual-channel filling valve system according to claim 3, characterized in that, The control valve core includes a control valve body and a second spring cavity; The control valve body also has a second pressure-sensing oil port. The first pressure-sensing oil port and the second spring cavity are disposed opposite to each other at both ends of the control valve body, and the second pressure-sensing oil port and the second spring cavity are located at the same end of the control valve body.

5. The dual-channel filling valve system according to claim 4, characterized in that, The control valve body has a first oil port, a second oil port, a third oil port, a fourth oil port, a fifth oil port and a sixth oil port; When the control valve body is in the first position, the first port is connected to the first oil port, the first oil port is connected to the second oil port, the second oil port is connected to the second pressure oil port of the main valve body, and the first oil port is disconnected from the third oil port. When the control valve body is in the second position, the fourth oil port is connected to the sixth oil port, the fifth oil port is disconnected from the sixth oil port, the second pressure oil port and the signal oil port are connected to the return oil port through the fifth oil port and the sixth oil port, and the sixth oil port is connected to the second pressure sensing oil port.

6. The dual-channel filling valve system according to claim 5, characterized in that, It includes a main filling oil circuit, a first filling oil circuit, a second filling oil circuit, a first connecting oil circuit, a second connecting oil circuit, and a third connecting oil circuit; One end of the main filling oil circuit is connected to the main valve body, and the other end is connected to the first filling oil circuit and the second filling oil circuit respectively. The first filling oil circuit is connected to the first accumulator, and the second filling oil circuit is connected to the second accumulator. One end of the first connecting oil circuit is connected to the main filling oil circuit, and the other end is connected to the control valve body; One end of the second connecting oil circuit is connected to the control valve body, and the other end is connected to the second pressure oil port and the signal oil port respectively; One end of the third connecting oil circuit is connected to the control valve body, and the other end is connected to the return oil port and the second pressure sensing oil port respectively.

7. The dual-channel filling valve system according to claim 6, characterized in that, It also includes a first check valve, a second check valve and a third check valve. The first check valve is disposed on the main filling oil line so that the oil flows from the main valve body to the first accumulator and the second accumulator. The second check valve is installed in the first filling oil line and the second filling oil line to prevent oil from flowing back from the first accumulator and the second accumulator.

8. The dual-channel filling valve system according to claim 1, characterized in that, It also includes the first test port and the bypass oil passage; One end of the bypass oil circuit is connected to the main valve core, and the other end is connected to the bypass oil port and the first test oil port respectively.

9. The dual-channel filling valve system according to claim 6, characterized in that, It also includes a second test port and a test oil circuit; One end of the test oil circuit is connected to the main filling oil circuit, and the other end is connected to the second test oil port.

10. A tractor, characterized in that, The dual-channel filling valve system includes any one of claims 1-9.

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