Machine tool self-balancing hydraulic control system
By introducing priority shunt valves and equipment balance valves into the equipment balance cylinder system, the problem of the equipment balance cylinder being susceptible to load is solved, and a more stable flow supply is achieved, reducing impact, and improving self-balancing performance and control accuracy of lifting speed is improved.
Patent Information
- Application Number
- CN202420732939.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-04-10
AI Technical Summary
The balancing cylinder structure of existing machinery is susceptible to load, resulting in impact, poor self-balancing performance, and inaccurate lifting and lowering speed control.
A hydraulic control system including a priority shunt valve, a machine balance valve and a machine balance cylinder is adopted. A constant flow rate is supplied to the machine balance valve through the first-stage outlet of the priority shunt valve, ensuring the stable flow rate into the machine balance cylinder and reducing impact.
It effectively reduces the impact of the equipment balance cylinder, improves the equipment's self-balancing performance, ensures the reliability of oil supply, and facilitates precise control of the equipment's lifting speed.
Smart Images
Figure CN222596424U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of agricultural machinery, in particular to a self-balancing hydraulic control system for a machine. Background Art
[0002] When agricultural machinery is mounted with lawn mowers and other tools, the lifting and self-balancing of the tools are controlled by the tool balancing cylinder. The tool balancing cylinder is a double-acting cylinder, whose fixed end is connected to the agricultural machinery and the mobile end is connected to the tool. By controlling the extension of the tool balancing cylinder, the lifting degree and balance of the tool are controlled. The cylinder body side and the piston rod side of the tool balancing cylinder are respectively provided with a switch valve and a throttle hole. The switch valve is used to control the amount of oil entering and exiting the two ends of the tool balancing cylinder, and the throttle hole is used to control the speed of oil in and out. Since the flow of the switch valve and the throttle hole is easily affected by pressure fluctuations, this structure is greatly affected by the load and is prone to impact. The self-balancing performance of the tool is poor, and the control of the lifting speed of the tool is not accurate. Utility Model Content
[0003] The technical problem to be solved by the utility model is: how to reduce the impact of the machine tool balancing cylinder and improve the self-balancing performance of the machine tool.
[0004] The technical solution of the utility model to solve the above technical problems is as follows:
[0005] The utility model provides a self-balancing hydraulic control system for a machine tool, comprising a priority diverter valve, a machine tool balancing valve, and a machine tool balancing oil cylinder. The inlet of the priority diverter valve is provided with an oil supply main circuit, the primary outlet of the priority diverter valve is connected to the machine tool balancing valve, and the secondary outlet of the priority diverter valve is connected to an external oil circuit; the first outlet of the machine tool balancing valve is connected to the piston rod side of the machine tool balancing oil cylinder, and the second outlet of the machine tool balancing valve is connected to the cylinder body side of the machine tool balancing oil cylinder.
[0006] The beneficial effects of the utility model are:
[0007] By adopting the utility model, a constant flow is supplied to the machine tool balancing valve through the primary outlet of the priority diverter valve, so that the flow entering the machine tool balancing cylinder is not affected by the load, the impact of the machine tool balancing cylinder is reduced, and the self-balancing performance of the machine tool is improved; at the same time, it is convenient to ensure the oil supply of the machine tool balancing cylinder, and the reliability is good; by switching the working position of the machine tool balancing valve, the extension and retraction state of the machine tool balancing cylinder can be controlled, and the operation is convenient.
[0008] On the basis of the above technical solution, the present invention can also be improved as follows.
[0009] Furthermore, a first one-way valve is provided in the oil circuit from the first outlet of the tool balancing valve to the tool balancing cylinder, and a second one-way valve is provided in the oil circuit from the second outlet of the tool balancing valve to the tool balancing cylinder. The first one-way valve and the second one-way valve can allow oil to flow from the tool balancing valve to the tool balancing cylinder in one direction; the first one-way valve and the second one-way valve are hydraulically controlled one-way valves; the pilot oil circuit of the first one-way valve is connected to the second outlet of the tool balancing valve, and the pilot oil circuit of the second one-way valve is connected to the first outlet of the tool balancing valve.
[0010] A two-way hydraulic lock is formed by two hydraulically controlled one-way valves, which avoids leakage of the tool balance cylinder when the tool balance valve is closed, thereby improving the tool height maintenance capability; when the tool balance valve is working, the oil circuit from the tool balance valve to the tool balance cylinder can achieve pressure balance within the opening time of the two-way hydraulic lock, thereby reducing the impact when the tool balance cylinder responds and improving the tool balance performance.
[0011] Furthermore, a throttle valve is also provided on the oil line from the first one-way valve to the machine balancing cylinder.
[0012] It is convenient to control the oil unloading speed on the piston rod side of the machine balance cylinder to avoid impact caused by excessive extension and to accurately control the extension speed.
[0013] Furthermore, the throttle valve is also connected in parallel with a third one-way valve, and the third one-way valve can allow oil to flow from the tool balance valve to the piston rod side of the tool balance cylinder in one direction.
[0014] It is convenient to make the pressure charging speed on the piston rod side of the machine balance cylinder not be affected by the throttle valve, so as to facilitate rapid pressure charging.
[0015] Furthermore, a pressure relief branch is provided at the inlet of the priority diverter valve, and a safety valve is provided on the pressure relief branch.
[0016] When the hydraulic pump outlet pressure is too high, it is convenient to partially release the pressure through the safety valve to ensure that the primary outlet of the priority diverter valve outputs a constant flow rate.
[0017] Furthermore, the tool balancing valve is a three-position switch valve, and a third outlet is provided on the tool balancing valve, and the third outlet is connected to the external oil circuit.
[0018] When the extension of the machine balance cylinder is maintained, the machine balance valve can discharge oil from the third outlet, which is convenient for guiding the hydraulic oil of the first-level outlet of the priority diverter valve to the external oil circuit, thereby improving the utilization rate of the oil.
[0019] Furthermore, the valve core of the tool balancing valve is provided with a first working position, a second working position and a third working position; when the first working position is in the middle of the tool balancing valve, the inlet of the tool balancing valve is connected with the first outlet, the oil return port of the tool balancing valve is connected with the second outlet, and the third outlet of the tool balancing valve is closed; when the second working position is in the middle of the tool balancing valve, the inlet of the tool balancing valve is connected with the third outlet, and the first outlet and the second outlet of the tool balancing valve are both closed; when the third working position is in the middle of the tool balancing valve, the inlet of the tool balancing valve is connected with the second outlet, the oil return port of the tool balancing valve is connected with the first outlet, and the third outlet of the tool balancing valve is closed.
[0020] By moving the valve core of the machine tool balance valve, the first workstation, the second workstation or the third workstation can be controlled to move to the middle of the machine tool balance valve for operation, which is easy to operate.
[0021] Furthermore, a single-outlet position and a double-outlet position are provided on the valve core of the priority diverter valve. When the single-outlet position is opposite to the inlet of the priority diverter valve, the inlet of the priority diverter valve is connected with the primary outlet, and the secondary outlet of the priority diverter valve is closed; when the double-outlet position is opposite to the inlet of the priority diverter valve, the inlet of the priority diverter valve is connected with the primary outlet and the secondary outlet respectively, and a damping structure is provided on the passage from the inlet of the priority diverter valve to the primary outlet.
[0022] When the flow of the hydraulic pump is small, the priority diverter valve is switched to the single-outlet position to ensure the oil supply to the machine balance valve; when the flow of the hydraulic pump is large, the priority diverter valve is switched to the double-outlet position to maintain a constant oil volume at the first-level outlet and reduce impact.
[0023] Furthermore, the damping structure is a throttle hole. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a structural schematic diagram of the utility model.
[0025] In the accompanying drawings, the technical features represented by the reference numerals are as follows:
[0026] 1-priority diverter valve; 10-safety valve; 11-primary outlet; 12-secondary outlet; 13-damping structure; 2-tool balancing valve; 21-first outlet; 22-second outlet; 23-third outlet; 24-return oil port; 3-tool balancing cylinder; 4-external oil line; 5-main oil supply line; 6-first one-way valve; 7-second one-way valve; 8-third one-way valve; 9-throttle valve. DETAILED DESCRIPTION
[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0028] This utility model refers to Figure 1 .
[0029] The utility model provides a self-balancing hydraulic control system for a machine tool, comprising a priority diverter valve 1, a machine tool balancing valve 2, and a machine tool balancing oil cylinder 3. The inlet of the priority diverter valve 1 is provided with an oil supply main circuit 5, the primary outlet 11 of the priority diverter valve 1 is connected to the machine tool balancing valve 2, and the secondary outlet 12 of the priority diverter valve 1 is connected to an external oil transmission circuit 4; the first outlet 21 of the machine tool balancing valve 2 is connected to the piston rod side of the machine tool balancing oil cylinder 3, and the second outlet 22 of the machine tool balancing valve 2 is connected to the cylinder body side of the machine tool balancing oil cylinder 3.
[0030] principle:
[0031] In the installed state, the main oil supply line 5 at the inlet of the priority diverter valve 1 is connected to the hydraulic pump, and the external oil line 4 can be connected to other actuators for outputting hydraulic oil. When working, the oil of the hydraulic pump first enters the priority diverter valve 1, and the primary outlet 11 of the priority diverter valve 1 preferentially supplies a constant flow to the machine balance valve 2, and the excess oil flows out from the secondary outlet 12 of the priority diverter valve 1. When the machine balance valve 2 switches to the first outlet 21 to discharge oil, oil is supplied to the piston rod side of the machine balance cylinder 3, the machine balance cylinder 3 shortens, and the machine descends; when the machine balance valve 2 switches to the second outlet 22 to discharge oil, oil is supplied to the cylinder body side of the machine balance cylinder 3, the machine balance cylinder 3 extends, and the machine rises; when the machine balance valve 2 is closed, the cylinder body side and the piston rod side of the machine balance cylinder 3 are closed, and the extension of the machine balance cylinder 3 remains unchanged. Since a constant flow is supplied to the tool balancing valve 2 through the primary outlet 11 of the priority diverter valve 1, the flow entering the tool balancing cylinder 3 is not affected by the load, and the extension and retraction speed of the tool balancing cylinder 3 can be accurately controlled.
[0032] Note: The priority diverter valve 1 is a prior art, which preferentially discharges oil from the primary outlet 11 , and the primary outlet 11 has a constant flow rate. When the oil circuit is sufficient, the excess flow flows out from the secondary outlet 12 .
[0033] By adopting the utility model, a constant flow is supplied to the tool balancing valve 2 through the primary outlet 11 of the priority diverter valve 1, so that the flow entering the tool balancing cylinder 3 is not affected by the load, the impact of the tool balancing cylinder 3 is reduced, and the self-balancing performance of the tool is improved; at the same time, it is convenient to ensure the oil supply of the tool balancing cylinder 3, and the reliability is good; by switching the working position of the tool balancing valve 2, the extension and retraction state of the tool balancing cylinder 3 can be controlled, and the operation is convenient.
[0034] Furthermore, a first one-way valve 6 is provided in the oil circuit from the first outlet 21 of the tool balancing valve 2 to the tool balancing cylinder 3, and a second one-way valve 7 is provided in the oil circuit from the second outlet 22 of the tool balancing valve 2 to the tool balancing cylinder 3. The first one-way valve 6 and the second one-way valve 7 can allow the oil to flow from the tool balancing valve 2 to the tool balancing cylinder 3 in one direction; the first one-way valve 6 and the second one-way valve 7 are hydraulically controlled one-way valves; the pilot oil circuit of the first one-way valve 6 is connected to the second outlet 22 of the tool balancing valve 2, and the pilot oil circuit of the second one-way valve 7 is connected to the first outlet 21 of the tool balancing valve 2.
[0035] Note: The first check valve 6 and the second check valve 7 constitute a two-way hydraulic lock. The two-way hydraulic lock is a prior art. The principle is that the two hydraulically controlled check valves take the pressure of the other side's oil circuit as the pilot oil. When one side of the pipeline has no pressure, the other side is closed at the same time. When the first outlet 21 of the machine balance valve 2 is discharging oil, the second check valve 7 can be controlled to open at the same time to facilitate the unloading of oil from the cylinder body side of the machine balance cylinder 3; when the second outlet 22 of the machine balance valve 2 is discharging oil, the first check valve 6 can be controlled to open at the same time to facilitate the unloading of oil from the piston rod side of the machine balance cylinder 3. When the machine balance valve 2 is closed, the first check valve 6 and the second check valve 7 are closed at the same time to facilitate maintaining the elongation of the machine balance cylinder 3.
[0036] Note: The first one-way valve 6 and the second one-way valve 7 can make the oil flow from the machine balance valve 2 to the machine balance cylinder 3 in one direction: refers to the installation direction of the first one-way valve 6 and the second one-way valve 7. When the first one-way valve 6 and the second one-way valve 7 are hydraulically controlled to open, the first one-way valve 6 and the second one-way valve 7 can still flow in both directions.
[0037] A two-way hydraulic lock is formed by two hydraulically controlled one-way valves, which avoids leakage of the tool balancing cylinder 3 when the tool balancing valve 2 is closed, thereby improving the tool height maintenance capability; when the tool balancing valve 2 is working, within the opening time of the two-way hydraulic lock, the oil circuit from the tool balancing valve 2 to the tool balancing cylinder 3 can achieve pressure balance, reducing the impact when the tool balancing cylinder 3 responds, thereby improving the tool balancing performance.
[0038] Furthermore, a throttle valve 9 is also provided on the oil line from the first one-way valve 6 to the tool balancing cylinder 3 .
[0039] It is convenient to control the oil unloading speed on the piston rod side of the machine balance cylinder 3, avoid impact caused by excessive extension, and facilitate accurate control of the extension speed.
[0040] Furthermore, the throttle valve 9 is also connected in parallel with a third one-way valve 8 , and the third one-way valve 8 can allow oil to flow from the tool balance valve 2 to the piston rod side of the tool balance cylinder 3 in one direction.
[0041] This facilitates the pressure charging speed on the piston rod side of the tool balance cylinder 3 not to be affected by the throttle valve 9, thereby facilitating rapid pressure charging.
[0042] Furthermore, a pressure relief branch is provided at the inlet of the priority diverter valve 1 , and a safety valve 10 is provided on the pressure relief branch.
[0043] When the hydraulic pump outlet pressure is too high, it is convenient to partially release the pressure through the safety valve 10, so as to ensure that the primary outlet 11 of the priority diverter valve 1 outputs a constant flow.
[0044] Furthermore, the tool balancing valve 2 is a three-position switch valve, and a third outlet 23 is provided on the tool balancing valve 2 , and the third outlet 23 is connected to the external oil circuit 4 .
[0045] When the extension of the tool balancing cylinder 3 is maintained, the tool balancing valve 2 can discharge oil from the third outlet 23, so as to facilitate the hydraulic oil of the primary outlet 11 of the priority diverter valve 1 to the external oil circuit 4, thereby improving the oil utilization rate.
[0046] Furthermore, the valve core of the tool balancing valve 2 is provided with a first workstation, a second workstation and a third workstation; when the first workstation is in the middle of the tool balancing valve 2, the inlet of the tool balancing valve 2 is connected to the first outlet 21, the oil return port 24 of the tool balancing valve 2 is connected to the second outlet 22, and the third outlet 23 of the tool balancing valve 2 is closed; when the second workstation is in the middle of the tool balancing valve 2, the inlet of the tool balancing valve 2 is connected to the third outlet 23, and the first outlet 21 and the second outlet 22 of the tool balancing valve 2 are both closed; when the third workstation is in the middle of the tool balancing valve 2, the inlet of the tool balancing valve 2 is connected to the second outlet 22, the oil return port 24 of the tool balancing valve 2 is connected to the first outlet 21, and the third outlet 23 of the tool balancing valve 2 is closed.
[0047] Note: Different slot channels are respectively provided at the first station, the second station and the third station, so as to realize different connection relationships among the inlet, the first outlet 21, the second outlet 22, the third outlet 23 and the oil return port 24 of the tool balance valve 2. In addition, the tool balance valve 2 is a three-position switch valve, which has 6 interfaces, namely the first outlet 21, the second outlet 22, the third outlet 23, the oil return port 24 and two inlets, and the two inlets have the same function. The primary outlet 11 of the priority diverter valve 1 can be connected to the two inlets of the tool balance valve 2 through branches.
[0048] By moving the valve core of the tool balance valve 2, the first workstation, the second workstation or the third workstation can be controlled to move to the middle of the tool balance valve 2 for operation, which is easy to operate.
[0049] Furthermore, a single-outlet position and a double-outlet position are provided on the valve core of the priority diverter valve 1. When the single-outlet position is opposite to the inlet of the priority diverter valve 1, the inlet of the priority diverter valve 1 is connected with the primary outlet 11, and the secondary outlet 12 of the priority diverter valve 1 is closed; when the double-outlet position is opposite to the inlet of the priority diverter valve 1, the inlet of the priority diverter valve 1 is connected with the primary outlet 11 and the secondary outlet 12 respectively, and a damping structure 13 is provided on the passage from the inlet of the priority diverter valve 1 to the primary outlet 11.
[0050] Note: The damping structure 13 may be a throttle hole to facilitate maintaining a constant flow rate at the primary outlet 11. In the valve core of the priority diverter valve 1, only one channel is provided at the single-outlet position, so that the inlet is only connected to the primary outlet 11; two channels are provided at the double-outlet position, so that the inlet is connected to the primary outlet 11 and the secondary outlet 12 respectively.
[0051] When the flow of the hydraulic pump is small, the priority diverter valve 1 is switched to the single-outlet position to ensure the oil supply to the tool balance valve 2; when the flow of the hydraulic pump is large, the priority diverter valve 1 is switched to the double-outlet position to maintain a constant oil volume at the first-level outlet 11 and reduce impact.
[0052] Furthermore, the damping structure 13 is a throttle hole.
[0053] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0054] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0055] In the present utility model, if the terms describing the relative functional relationship of the structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context, etc.
[0056] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, a first feature is "on" or "below" a second feature, unless otherwise clearly specified and limited, it should not be understood in a restrictive manner. For example, "on" or "below" may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.
[0057] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.
[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents.
Claims
1. A self-balancing hydraulic control system for a machine, characterized in that: The invention comprises a priority diverter valve (1), a tool balancing valve (2), and a tool balancing oil cylinder (3); the inlet of the priority diverter valve (1) is provided with an oil supply main circuit (5); the primary outlet (11) of the priority diverter valve (1) is connected to the tool balancing valve (2); the secondary outlet (12) of the priority diverter valve (1) is connected to an external oil transmission circuit (4); the first outlet (21) of the tool balancing valve (2) is connected to the piston rod side of the tool balancing oil cylinder (3); the second outlet (22) of the tool balancing valve (2) is connected to the cylinder body side of the tool balancing oil cylinder (3).
2. The self-balancing hydraulic control system for machine tools according to claim 1, characterized in that: A first non-return valve (6) is provided on the oil circuit from the first outlet (21) of the tool balancing valve (2) to the tool balancing cylinder (3), and a second non-return valve (7) is provided on the oil circuit from the second outlet (22) of the tool balancing valve (2) to the tool balancing cylinder (3). The first non-return valve (6) and the second non-return valve (7) can allow oil to flow from the tool balancing valve (2) to the tool balancing cylinder (3) in one direction; the first non-return valve (6) and the second non-return valve (7) are hydraulically controlled non-return valves; the pilot oil circuit of the first non-return valve (6) is connected to the second outlet (22) of the tool balancing valve (2), and the pilot oil circuit of the second non-return valve (7) is connected to the first outlet (21) of the tool balancing valve (2).
3. The implement self-balancing hydraulic control system according to claim 2, characterized in that: A throttle valve (9) is also provided on the oil line from the first one-way valve (6) to the machine balancing oil cylinder (3).
4. The implement self-balancing hydraulic control system according to claim 3, characterized in that: The throttle valve (9) is also connected in parallel with a third one-way valve (8), and the third one-way valve (8) can allow oil to flow from the machine balance valve (2) to the piston rod side of the machine balance cylinder (3) in one direction.
5. The implement self-balancing hydraulic control system according to claim 1, characterized in that: The inlet of the priority diverter valve (1) is also provided with a pressure relief branch, and a safety valve (10) is provided on the pressure relief branch.
6. The implement self-balancing hydraulic control system according to claim 1, characterized in that: The tool balance valve (2) is a three-position switch valve. The tool balance valve (2) is also provided with a third outlet (23), and the third outlet (23) is connected to the external oil transmission line (4).
7. The implement self-balancing hydraulic control system according to claim 6, characterized in that: The valve core of the tool balancing valve (2) is provided with a first working position, a second working position and a third working position; when the first working position is in the middle of the tool balancing valve (2), the inlet of the tool balancing valve (2) is connected to the first outlet (21), the oil return port (24) of the tool balancing valve (2) is connected to the second outlet (22), and the third outlet (23) of the tool balancing valve (2) is closed; when the second working position is in the middle of the tool balancing valve (2), the inlet of the tool balancing valve (2) is connected to the third outlet (23), and the first outlet (21) and the second outlet (22) of the tool balancing valve (2) are both closed; when the third working position is in the middle of the tool balancing valve (2), the inlet of the tool balancing valve (2) is connected to the second outlet (22), the oil return port (24) of the tool balancing valve (2) is connected to the first outlet (21), and the third outlet (23) of the tool balancing valve (2) is closed.
8. The implement self-balancing hydraulic control system according to claim 1, characterized in that: The valve core of the priority diverter valve (1) is provided with a single-outlet position and a double-outlet position. When the single-outlet position is directly opposite to the inlet of the priority diverter valve (1), the inlet of the priority diverter valve (1) is connected to the primary outlet (11), and the secondary outlet (12) of the priority diverter valve (1) is closed; when the double-outlet position is directly opposite to the inlet of the priority diverter valve (1), the inlet of the priority diverter valve (1) is respectively connected to the primary outlet (11) and the secondary outlet (12), and a damping structure (13) is provided on the passage from the inlet of the priority diverter valve (1) to the primary outlet (11).
9. The implement self-balancing hydraulic control system according to claim 8, characterized in that: The damping structure (13) is a throttle hole.