Steering hydraulic system of high-speed loader and high-speed loader

Abstract

The invention discloses a steering hydraulic system of a high-speed loader and the high-speed loader. The system comprises a hydraulic oil tank, a steering pump, a steering valve, a locking control valve, a reversing valve, a hinged steering oil cylinder and a front axle steering oil cylinder. When the reversing valve is located at the first working position, the reversing valve conveys hydraulic oil to the hinged steering oil cylinder and controls the hinged steering oil cylinder to conduct steering work, and meanwhile the locking control valve controls the front axle steering oil cylinder to be locked. When the reversing valve is located at the second working position, the reversing valve conveys the hydraulic oil to the front axle steering oil cylinder and controls the front axle steering oil cylinder to conduct steering work, and meanwhile the locking control valve controls the hinged steering oil cylinder to be locked. The steering hydraulic system aims at solving the core contradiction that the high-speed running stability and the low-speed operation flexibility of an existing high-speed hinged type loader cannot be achieved at the same time, and particularly solves the problem that when the existing loader is only provided with a hinged steering single steering control system, hinged steering easily causes vehicle instability in the high-speed running process.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-speed loader steering, and particularly relates to a high-speed loader steering hydraulic system and high-speed loader BACKGROUND At present, mainstream medium and large wheel loaders on the market generally adopt a movable hinged frame structure and realize steering through a hydraulic oil cylinder drive. The core of the technical solution is to use a central hinge pin connecting the front and rear frames to force the two frames to produce relative rotation in the horizontal plane by the extension and retraction of the steering oil cylinder, and the maximum steering angle is usually designed to be about ±40°.

[0002] Such a steering structure exhibits significant superiority when the loader is operating at low speed, such as loading, digging, lifting and short-distance transfer. The steering angle is large, the steering radius is small, and the maneuverability is high, which can well meet the frequent and sudden steering requirements in a narrow space.

[0003] However, as the application of the loader is expanded to high-speed and long-distance transfer conditions (the highest driving speed can reach 40km / h or above), the hinged steering system exposes inherent technical defects. The core problem is that the angular transmission ratio of the steering system is fixed and unchangeable, that is, the steering wheel angle and the relative rotation angle of the frame always maintain a linear relationship. In the high-speed driving state, even a small angle input of the steering wheel by the driver will be directly converted into a large angle hinged steering between the frames. Such a too direct and sensitive steering response will cause the mass center trajectory of the whole machine to change sharply, which easily causes vehicle instability and the so-called "drifting" phenomenon.

[0004] The "drifting" phenomenon is essentially a dynamic instability, which not only seriously weakens the steering safety of the vehicle, but also greatly increases the risk of overturning due to side slipping or tail swinging in the high-speed state, posing a major threat to driving safety. Therefore, the fixed transmission ratio hinged steering system in the prior art cannot simultaneously meet the high flexibility requirement in low-speed operation and the excellent stability requirement in high-speed driving, and this contradiction has become a key technical bottleneck restricting the improvement of the comprehensive performance of the loader.

[0005] Therefore, there is an urgent need for an innovative steering control technology or method that can dynamically adjust the response characteristics of the steering system according to the real-time running state of the vehicle to solve the above-mentioned inherent defects. SUMMARY

[0006] One of the purposes of the present application is to disclose a high-speed loader steering hydraulic system, which aims to solve the core contradiction that the high-speed hinged loader cannot simultaneously meet the high-speed driving stability and low-speed operation flexibility, and specifically to solve the problem that the existing loader only has a hinged steering single steering control system, which easily causes vehicle instability during high-speed driving.

[0007] The second object of the present application is to disclose a high-speed loader, which has the steering hydraulic system of the high-speed loader, so that the loader can realize flexible steering during operation and stable steering and driving during high-speed driving.

[0008] In order to achieve the above object, the present application discloses a steering hydraulic system of a high-speed loader, which comprises a hydraulic oil tank, a steering pump, a steering valve, a lock control valve, a reversing valve, an articulated steering oil cylinder and a front axle steering oil cylinder. The reversing valve has a first working position and a second working position, the first working position is connected with the articulated steering oil cylinder, and the second working position is connected with the front axle steering oil cylinder. The lock control valve is connected with the articulated steering oil cylinder and the front axle steering oil cylinder. The steering pump delivers hydraulic oil in the hydraulic oil tank to the steering valve, the steering valve delivers hydraulic oil to the reversing valve, and the steering valve controls the direction of the hydraulic oil delivered to the reversing valve. When the reversing valve is in the first working position, the reversing valve delivers hydraulic oil to the articulated steering oil cylinder to control the articulated steering oil cylinder to perform steering work, and at the same time, the lock control valve controls the front axle steering oil cylinder to be locked. When the reversing valve is in the second working position, the reversing valve delivers hydraulic oil to the front axle steering oil cylinder to control the front axle steering oil cylinder to perform steering work, and at the same time, the lock control valve controls the articulated steering oil cylinder to be locked.

[0009] As an optional embodiment, the steering valve comprises a steering valve core, the steering valve core has a working position one and a working position two, the steering valve further comprises an oil inlet, an oil return port, a working oil port one and a working oil port two, the oil inlet is communicated with the steering pump, the oil return port is communicated with the hydraulic oil tank, and the working oil port one and the working oil port two are both communicated with the reversing valve. When the steering valve core is in the working position one, the oil inlet is communicated with the working oil port one, and the oil return port is communicated with the working oil port two. When the steering valve core is in the working position two, the oil inlet is communicated with the working oil port two, and the oil return port is communicated with the working oil port one.

[0010] As an optional embodiment, the steering valve further comprises a pressure reducing valve, a first electromagnetic valve, a second electromagnetic valve, a first shuttle valve and a second shuttle valve. The inlet of the pressure reducing valve is communicated with the oil inlet. The outlet of the pressure reducing valve is communicated with the inlet of the first solenoid valve, the outlet of the first solenoid valve is communicated with the first inlet of the first shuttle valve, the outlet of the first shuttle valve is communicated with the first pilot oil port of the steering valve core, and the first pilot oil port controls the steering valve core to operate in the working position 1; The outlet of the pressure reducing valve is also connected to the inlet of the second solenoid valve, the outlet of the second solenoid valve is connected to the first inlet of the second shuttle valve, the outlet of the second shuttle valve is connected to the second pilot oil port of the steering valve core, and the second pilot oil port controls the steering valve core to operate in the working position 2.

[0011] As an optional embodiment, the steering hydraulic system of the high-speed loader, the steering valve also includes a third shuttle valve and a pressure sensor, the pressure sensor is connected to the outlet of the third shuttle valve; the first inlet of the third shuttle valve is connected to the outlet of the first solenoid valve, and the second inlet of the third shuttle valve is connected to the outlet of the second solenoid valve.

[0012] As an optional embodiment, the steering hydraulic system of the high-speed loader, the steering valve further includes a third solenoid valve and a fourth solenoid valve; The outlet of the pressure reducing valve is communicated with the inlet of the third solenoid valve, and the outlet of the third solenoid valve is communicated with the second inlet of the first shuttle valve; The outlet of the pressure reducing valve is also communicated with the inlet of the fourth solenoid valve, and the outlet of the fourth solenoid valve is communicated with the second inlet of the second shuttle valve.

[0013] As an optional embodiment, the steering hydraulic system of the high-speed loader, the steering valve also includes a first overflow valve and a second overflow valve, the first overflow valve connects the working oil port 1 to the hydraulic oil tank passage, and the second overflow valve connects the working oil port 2 to the hydraulic oil tank passage.

[0014] As an optional embodiment, the reversing valve includes a first working oil port, a second working oil port, a third working oil port, a fourth working oil port, a fifth working oil port and a sixth working oil port; When the reversing valve is in the first working position, the first working oil port is connected to the third working oil port, and the second working oil port is connected to the fourth working oil port; When the reversing valve is in the second working position, the first working oil port is communicated with the fifth working oil port, and the second working oil port is communicated with the sixth working oil port.

[0015] As an optional embodiment, the articulated steering cylinder includes a first articulated steering cylinder, a second articulated steering cylinder, a first hydraulic lock and a second hydraulic lock; When the reversing valve is in the first working position, the locking control valve controls the locking of the front axle steering cylinder, and the locking control valve also controls the opening of the first hydraulic lock and the second hydraulic lock; the third working oil port is connected to the large chamber of the first articulated steering cylinder and the small chamber of the second articulated steering cylinder, and the fourth working oil port is connected to the large chamber of the second articulated steering cylinder and the small chamber of the first articulated steering cylinder.

[0016] As an optional embodiment, the front axle steering cylinder includes a first front axle steering cylinder, a second front axle steering cylinder, a third hydraulic lock and a fourth hydraulic lock; When the reversing valve is in the second working position, the locking control valve controls the locking of the articulated steering cylinder, and the locking control valve also controls the opening of the third hydraulic lock and the fourth hydraulic lock; the fifth working oil port is connected with the large chamber of the first front axle steering cylinder and the small chamber of the second front axle steering cylinder, and the sixth working oil port is connected with the large chamber of the second front axle steering cylinder and the small chamber of the first front axle steering cylinder.

[0017] As an optional embodiment, the locking control valve includes a liquid inlet, a liquid return port, a first control port and a second control port, the liquid inlet is connected to the accumulator, the accumulator is supplied with oil by the working hydraulic system, the liquid return port is connected to the hydraulic oil tank, the first control port controls the opening and locking of the first hydraulic lock and the second hydraulic lock, and the second control port controls the opening and locking of the third hydraulic lock and the fourth hydraulic lock.

[0018] A high-speed loader comprises the steering hydraulic system of the high-speed loader mentioned above.

[0019] Compared with the prior art, the steering hydraulic system of a high-speed loader of the present invention has the beneficial effect of achieving optimal performance matching under all working conditions.

[0020] Under low-speed, heavy-load conditions, the operator can switch to articulated steering mode. This allows the system to take advantage of its maximum steering angle (approximately 40°), resulting in a small turning radius and exceptional maneuverability, perfectly meeting the agility requirements of complex operations such as loading and unloading.

[0021] During high-speed transitions, the driver can switch to front-axle steering mode. This allows the vehicle to steer in a manner similar to that of a standard car, with linear and smooth steering response. This eliminates the inherent high-speed drifting characteristic of articulated steering, significantly enhancing driving safety and maneuverability.

[0022] The beneficial effect of the high-speed loader of the present invention is that the steering hydraulic system of the aforementioned high-speed loader is used on the high-speed loader, so that the loader has two steering modes: articulated steering and front axle steering. This makes the loader no longer just a "low-speed operating equipment", but truly becomes a multifunctional machine with both "efficient operation" and "high-speed and safe transfer" capabilities, which significantly improves the overall work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is an embodiment diagram of a steering hydraulic system of a high-speed loader of the present application, that is, a hydraulic system diagram during articulated steering.

[0025] Figure 2 It is a schematic diagram of the steering hydraulic system of a high-speed loader in the front axle steering state.

[0026] Figure 3 for Figure 2 A partial enlarged view of .

[0027] Figure 4 This is an embodiment diagram of the steering valve in the present application, and the state of the steering valve core in this figure is a state where the loader is not steering.

[0028] Figure 5 This is a schematic diagram of the steering valve in the present application in the working position 1.

[0029] Figure 6 This is a schematic diagram of the steering valve in the second working position in this application.

[0030] Figure 7 This is an embodiment diagram of a steering hydraulic system of a high-speed loader of the present application, that is, a schematic diagram when the loader is not steering.

[0031] Description of main reference numerals: 1. Priority valve; 2. Steering valve; 21. Steering valve core; 22. Pressure reducing valve; 23. First solenoid valve; 24. Second solenoid valve; 25. First shuttle valve; 26. Second shuttle valve; 27. Third shuttle valve; 28. Third solenoid valve; 29. ​​Fourth solenoid valve; 30. First relief valve; 31. Second relief valve; 32. Pressure sensor; 3. Articulated steering cylinder; 31. First articulated steering cylinder; 32. Second articulated steering cylinder; 33. First hydraulic lock; 34. Second hydraulic lock; 4. Articulated steering passive cylinder; 41. First articulated steering passive cylinder; 42. Second articulated steering passive cylinder; 43. Fifth hydraulic lock; 44. Sixth hydraulic lock; 5. Front axle steering cylinder; 51. First front axle steering cylinder; 52. Second front axle steering cylinder; 53. Third hydraulic lock; 54. Fourth hydraulic lock; 6. Steering pump; 7. Hydraulic oil tank; 8. Reversing valve; 9. Locking control valve; 10. Accumulator. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] In the present invention, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the present invention and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0034] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0035] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0036] Furthermore, the terms "first," "second," and the like are primarily used to distinguish different devices, elements, or components (which may or may not be the same in type and configuration) and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0037] The technical solution of the present invention will be further described below in conjunction with embodiments and drawings.

[0038] See also Figure 1 and Figure 2 As shown, an embodiment of the present application provides a steering hydraulic system for a high-speed loader, including a hydraulic oil tank 7, a steering pump 6, a steering valve 2, a locking control valve 9, a reversing valve 8, an articulated steering cylinder 3 and a front axle steering cylinder 5.

[0039] The reversing valve 8 has a first working position and a second working position. The first working position is connected to the articulated steering cylinder 3 , and the second working position is connected to the front axle steering cylinder 5 .

[0040] The locking control valve 9 is connected to the articulated steering cylinder 3 and the front axle steering cylinder 5 .

[0041] The steering pump 6 delivers the hydraulic oil in the hydraulic oil tank to the steering valve 2 , and the steering valve 2 delivers the hydraulic oil to the reversing valve 8 , and the steering valve 2 controls the direction of the hydraulic oil delivered to the reversing valve 8 .

[0042] When the reversing valve 8 is in the first working position, the reversing valve 8 delivers hydraulic oil to the articulated steering cylinder 3 to control the articulated steering cylinder 3 to perform steering work, and at the same time the locking control valve 9 controls the front axle steering cylinder 5 to lock.

[0043] When the reversing valve 8 is in the second working position, the reversing valve 8 delivers hydraulic oil to the front axle steering cylinder 5 to control the front axle steering cylinder 5 to perform steering work, and at the same time the locking control valve 9 controls the articulated steering cylinder 3 to lock.

[0044] In this embodiment, the high-speed loader's steering hydraulic system has an articulated steering mode. This means that when the high-speed loader is operating under heavy load, articulated steering is selected. In this state, the articulated steering cylinder 3 performs steering, while the front axle steering cylinder 5 is locked. The hydraulic circuitry operates as follows: the hydraulic pump draws hydraulic oil from the hydraulic tank and delivers it to the steering valve 2. The steering valve 2 delivers hydraulic oil to the reversing valve 8. The reversing valve 8 delivers hydraulic oil to the articulated steering cylinder 3, driving the articulated steering cylinder 3 to achieve steering. Simultaneously, the locking control valve 9 controls the locking of the front axle steering cylinder 5.

[0045] In this embodiment, the steering hydraulic system of the high-speed loader has a front-axle steering mode. That is, when the high-speed loader is traveling at high speed, front-axle steering is selected. In this state, the front-axle steering cylinder 5 performs steering, while the articulated steering cylinder 3 is locked. The hydraulic circuitry in this state follows: the hydraulic pump draws hydraulic oil from the hydraulic tank and delivers it to the steering valve 2. The steering valve 2 delivers hydraulic oil to the reversing valve 8. The reversing valve 8 delivers hydraulic oil to the front-axle steering cylinder 5, driving the front-axle steering cylinder 5 to achieve steering. Simultaneously, the locking control valve 9 controls the locking of the articulated steering cylinder 3.

[0046] This embodiment aims to resolve the core contradiction existing in existing high-speed articulated loaders, which is the inability to achieve both high-speed driving stability and low-speed operating flexibility. Specifically: (1) Solve the problem of poor high-speed driving stability. In traditional articulated steering systems, at high speeds (e.g., 40 km / h and above), even a slight steering wheel input will cause the frame to articulate at a large angle, resulting in a sudden change in the trajectory of the vehicle's center of gravity, creating the risk of "drifting", skidding, or even overturning. The steering hydraulic system of the high-speed loader of this embodiment introduces a front axle steering mode, switching to a more stable front axle steering mode at high speeds, with a small steering angle and safer driving.

[0047] (2) Solve the inherent performance limitations of a single steering mode. Both single articulated steering and single front axle steering have their own insurmountable shortcomings. Articulated steering is flexible at low speeds but unstable at high speeds; front axle steering is stable at high speeds but has a large turning radius and poor low-speed maneuverability. The steering hydraulic system of the high-speed loader of this embodiment breaks the performance ceiling of a single steering mode by integrating two steering modes.

[0048] (3) Solve the safety problem of mode switching and actuator interlocking. In a dual steering system, if the actuator (cylinder) in the non-operating mode is not completely locked, serious interference will occur. For example, when steering the front axle, if the articulated cylinder is not locked, the frame will experience uncontrollable relative swinging, which is extremely dangerous. The steering hydraulic system of the high-speed loader of this embodiment uses the innovative "locking control valve 9" design to ensure that under any working condition, only one steering system is working and the other is rigidly locked, fundamentally eliminating the risk of interference.

[0049] (4) Solving the complexity of system integration and control, efficiently and reliably integrating two independent steering systems into a single hydraulic system, and achieving smooth switching, is a huge engineering challenge. The steering hydraulic system of the high-speed loader in this embodiment uses a clever valve group (direction control valve 8, locking control valve 9) design to achieve control of two actuators with a single pump source and main control valve (steering valve 2), simplifying the system structure and improving reliability.

[0050] This embodiment has achieved significant technical progress and practical effects through innovative hydraulic system design, specifically: (1) Achieved optimal performance matching under all operating conditions Under slow-speed, heavy-load conditions, the operator can switch to articulated steering mode. This allows the system to take advantage of its maximum steering angle (approximately 40°), resulting in a small turning radius and exceptional maneuverability, perfectly meeting the agility requirements of complex operations such as loading and unloading.

[0051] During high-speed transitions, the driver can switch to front-axle steering mode. This allows the vehicle to steer in a linear and smooth manner, similar to a standard car. This eliminates the inherent high-speed drifting characteristic of articulated steering, significantly enhancing driving safety and maneuverability.

[0052] (2) Significantly improved the safety and reliability of the entire machine When the articulated steering cylinder 3 is steering, the front axle steering cylinder 5 is locked, and when the front axle steering cylinder 5 is steering, the articulated steering cylinder 3 is locked. This "one working, one locked" interlocking mechanism, through the coordinated action of the locking control valve 9, strictly ensures that when one steering mode is in progress, the cylinder in the other steering mode is firmly locked in the established position, avoiding the risk of loss of control caused by the movement of the non-active steering mechanism, and the system has high inherent safety. In other words, this "one working, one locked" interlocking mechanism eliminates the risk of high-speed steering instability, fundamentally solving the industry's pain point of dangerous high-speed steering in traditional articulated loaders and reducing the accident rate.

[0053] (3) Optimized system structure and achieved high reliability Mode selection is performed using reversing valve 8, while safety interlocking is achieved using locking control valve 9. The shared steering pump 6 and steering valve 2 serve as the pressure source and core control, eliminating the high cost and complex structure of two completely independent hydraulic systems. This results in a compact and cost-effective system. Furthermore, the steering hydraulic system of this high-speed loader selects the mode via reversing valve 8, with all other actions automatically linked. The operating logic is simple and clear, eliminating the need for complex electronic sensors and controllers. The hydraulic logic itself implements core safety functions, offering strong anti-interference capabilities and high reliability.

[0054] (4) Expanded the application scenarios and performance boundaries of loaders The steering hydraulic system of this high-speed loader makes the loader no longer just a "low-speed operating equipment", but truly a multifunctional machine with both "efficient operation" and "high-speed and safe transfer" capabilities. It is suitable for scenarios such as large mines and water conservancy construction sites that require long-distance travel between work points, significantly improving overall work efficiency.

[0055] In summary, the steering hydraulic system of this high-speed loader adds a reversing valve 8, an articulated steering cylinder 3, a front axle steering cylinder 5, and a locking control valve 9 to the original loader, so as to realize the use of the articulated steering mode in the shoveling condition, which is flexible in steering, and the use of the front axle steering mode in the high-speed sports car condition, which is safe in steering.

[0056] In some embodiments, the steering valve 2 is used to control and switch the direction of the hydraulic oil entering the articulated steering cylinder 3 and the front axle steering cylinder 5, that is, to control the steering direction of the loader.

[0057] The steering valve 2 includes a steering valve core 21, which has a working position 1 (such as Figure 4 shown in the upper position) and working position 2 (as ... Figure 4 The reversing valve 8 further includes an oil inlet P1, an oil return port T1, a working oil port 1A, and a working oil port 2B. The oil inlet P1 is connected to the steering pump 6, the oil return port T1 is connected to the hydraulic oil tank 7, and the working oil port 1A and the working oil port 2B are both connected to the reversing valve 8.

[0058] When the steering valve core 21 is in working position 1, the oil inlet P1 is connected to the working oil port 1 A, and the oil return port T1 is connected to the working oil port 2 B. At this time, the working oil port 1 A outputs hydraulic oil to the reversing valve 8, and the working oil port 2 B returns oil.

[0059] When the steering valve core 21 is in working position 2, the oil inlet P1 is connected to the working oil port 2 B, and the oil return port T1 is connected to the working oil port 1 A. At this time, the working oil port 2 B outputs hydraulic oil to the reversing valve 8, and the working oil port 1 A returns oil.

[0060] The steering valve 2 controls the direction of the hydraulic oil circuit to control the direction of the loader's steering. If the steering valve core 21 is in the first working position, the loader turns left, and if the steering valve core 21 is in the second working position, the loader turns right.

[0061] In some embodiments, the reversing valve 8 core also includes an oil inlet B1, an oil return port B2, a working oil port 1 B3 and a working oil port 2 B4. The oil inlet B1 is connected to the oil inlet P1 of the steering valve 2, the oil return port B2 is connected to the oil return port T1 of the steering valve 2, the working oil port 1 B3 is connected to the working oil port 1 A of the steering valve 2, and the working oil port 2 B4 is connected to the working oil port 2 B of the steering valve 2.

[0062] When the steering valve core 21 is in working position 1, the oil inlet B1 is connected to the working oil port 1 B3, and the oil return port B2 is connected to the working oil port 2 B4. At this time, the working oil port 1 B3 outputs hydraulic oil to the reversing valve 8, and the working oil port 2 B4 returns oil.

[0063] When the steering spool 21 is in the working position two, the oil inlet B1 is communicated with the working oil outlet two B4, the oil return B2 is communicated with the working oil outlet one B3, at this time the working oil outlet two B4 outputs hydraulic oil to the reversing valve 8, and the working oil outlet one B3 returns oil.

[0064] That is, in summary, the steering spool 21 controls the direction of the hydraulic oil circuit, and realizes the control of the direction of the loader steering. Assuming that the steering spool 21 is in the working position one, the loader steers to the left, and then the steering spool 21 is in the working position two, the loader steers to the right.

[0065] In this embodiment, the control of the steering direction of the loader by the steering valve 2 makes the system compact and the cost controllable.

[0066] In some embodiments, the steering valve 2 further comprises a pressure reducing valve 22, a first electromagnetic valve 23, a second electromagnetic valve 24, a first shuttle valve 25 and a second shuttle valve 26. The inlet of the pressure reducing valve 22 is communicated with the oil inlet of the steering valve 2.

[0067] The outlet of the pressure reducing valve 22 is communicated with the inlet of the first electromagnetic valve 23, the outlet of the first electromagnetic valve 23 is communicated with the first inlet of the first shuttle valve 25, the outlet of the first shuttle valve 25 is communicated with the first pilot oil port of the steering spool 21, and the first pilot oil port controls the steering spool 21 to work in the working position one.

[0068] The outlet of the pressure reducing valve 22 is also communicated with the inlet of the second electromagnetic valve 24, the outlet of the second electromagnetic valve 24 is communicated with the first inlet of the second shuttle valve 26, the outlet of the second shuttle valve 26 is communicated with the second pilot oil port of the steering spool 21, and the second pilot oil port controls the steering spool 21 to work in the working position two.

[0069] In this embodiment, the working position of the steering spool 21 is controlled by using the pressure reducing valve 22, the first electromagnetic valve 23, the second electromagnetic valve 24, the first shuttle valve 25 and the second shuttle valve 26, that is, the steering spool 21 is controlled to be in the working position one or the working position two. The first electromagnetic valve 23 and the second electromagnetic valve 24 are provided, the outlet of the first electromagnetic valve 23 is communicated with the first inlet of the first shuttle valve 25, which is used to control the steering spool 21 to be in the starting working position one, and the outlet of the second electromagnetic valve 24 is communicated with the first inlet of the second shuttle valve 26, which is used to control the steering spool 21 to be in the starting working position two. The specific control process is as follows: The hydraulic oil output by the steering pump 6 enters through the oil inlet P1 of the steering valve 2, then enters the pressure reducing valve 22, and then enters the first pilot oil port of the steering spool 21 after being reduced by the pressure reducing valve 22, and the hydraulic oil in the first pilot oil port pushes the steering spool 21 to move downward, as shown in the figure. Figure 5As shown, the steering valve core 21 is in the working position 1 state.

[0070] The hydraulic oil output by the steering pump 6 enters through the oil inlet P1 of the steering valve 2, and then enters the pressure reducing valve 22. After being reduced in pressure by the pressure reducing valve 22, it serves as the pilot oil. The pilot oil then passes through the second solenoid valve 24, the first inlet of the second shuttle valve 26, the outlet of the second shuttle valve 26, and finally enters the second pilot oil port of the steering valve core 21. The pilot oil entering the second pilot oil port pushes the steering valve core 21, causing the steering valve core 21 to move upward. Figure 6 As shown, the steering valve core 21 is in the working position 2.

[0071] In this embodiment, the working position of the steering valve core 21 is controlled by utilizing the pressure reducing valve 22, the first solenoid valve 23, the second solenoid valve 24, the first shuttle valve 25 and the second shuttle valve 26. The working logic is simple and clear, and complex electronic sensors and controllers are reduced. The hydraulic logic itself realizes the core safety function, has strong anti-interference ability and high reliability.

[0072] In some embodiments, the steering valve 2 further includes a third shuttle valve 27 and a pressure sensor 32. The pressure sensor 32 is connected to the outlet of the third shuttle valve 27. The first inlet of the third shuttle valve 27 is connected to the outlet of the first solenoid valve 23, and the second inlet of the third shuttle valve 27 is connected to the outlet of the second solenoid valve 24. The pressure sensor 32 is used to detect the hydraulic oil pressure at the outlet of the third shuttle valve 27 to detect and determine whether the first solenoid valve 23 and / or the second solenoid valve 24 are functioning properly, ensuring that the first solenoid valve 23 and / or the second solenoid valve 24 are functioning properly. If the pressure sensor 32 cannot properly detect pressure, it is determined that the first solenoid valve 23 or the second solenoid valve 24 is faulty, and it is necessary to shut down the hydraulic system or activate a backup solenoid valve to ensure the normal operation of the steering hydraulic system of the high-speed loader.

[0073] In some embodiments, the steering valve 2 further includes a third solenoid valve 28 and a fourth solenoid valve 29 . The third solenoid valve 28 and the fourth solenoid valve 29 are backup solenoid valves for the first solenoid valve 23 and the second solenoid valve 24 , respectively.

[0074] The outlet of the pressure reducing valve 22 is communicated with the inlet of the third solenoid valve 28 , and the outlet of the third solenoid valve 28 is communicated with the second inlet of the first shuttle valve 25 .

[0075] The outlet of the pressure reducing valve 22 is also communicated with the inlet of the fourth solenoid valve 29 , and the outlet of the fourth solenoid valve 29 is communicated with the second inlet of the second shuttle valve 26 .

[0076] The specific control process when the third solenoid valve 28 and the fourth solenoid valve 29 are involved in the operation is as follows: The hydraulic oil output by the steering pump 6 enters through the oil inlet P1 of the steering valve 2, and then enters the pressure reducing valve 22. After being reduced in pressure by the pressure reducing valve 22, it serves as the pilot oil. The pilot oil then passes through the third solenoid valve 28, the second inlet of the first shuttle valve 25, the outlet of the first shuttle valve 25, and finally enters the first pilot oil port of the steering valve core 21. The pilot oil entering the first pilot oil port pushes the steering valve core 21, causing the steering valve core 21 to move downward. Figure 5 As shown, the steering valve core 21 is in the working position 1 state.

[0077] The hydraulic oil output by the steering pump 6 enters through the oil inlet P1 of the steering valve 2, and then enters the pressure reducing valve 22. After being reduced in pressure by the pressure reducing valve 22, it serves as the pilot oil. The pilot oil then passes through the fourth solenoid valve 29, the second inlet of the second shuttle valve 26, the outlet of the second shuttle valve 26, and finally enters the second pilot oil port of the steering valve core 21. The pilot oil entering the second pilot oil port pushes the steering valve core 21, causing the steering valve core 21 to move upward. Figure 6 As shown, the steering valve core 21 is in the working position 2.

[0078] In this embodiment, a third solenoid valve 28 and a fourth solenoid valve 29 are provided. The third solenoid valve 28 and the fourth solenoid valve 29 are backup solenoid valves for the first solenoid valve 23 and the second solenoid valve 24, respectively. When the first solenoid valve 23 and / or the second solenoid valve 24 fails, the steering valve 2 can be ensured to operate normally.

[0079] In some embodiments, the steering valve 2 further includes a first relief valve 30 and a second relief valve 31. The first relief valve 30 connects the working oil port 1 to the hydraulic oil tank 7, and the second relief valve 31 connects the working oil port 2 to the hydraulic oil tank 7. By providing the first relief valve 30 and the second relief valve 31, the pressure of the hydraulic oil entering the reversing valve 8 is controlled, thereby limiting the steering pressure.

[0080] In some embodiments, the steering valve 2 also includes an LS port, the LS port of the steering valve 2 is connected to the steering valve core 21, and the feedback oil circuit of the steering valve core 21 is fed back to the priority valve 1 through the Ls port of the steering valve 2, and the steering pressure is limited by the overflow valve of the priority valve 1.

[0081] like Figure 1 As shown, a priority valve 1 is provided between the steering pump 6 and the steering valve 2. The steering hydraulic system and the working hydraulic system of the high-speed loader are connected to the priority valve 1. The priority valve 1 draws hydraulic oil from the hydraulic oil tank 7 through the steering pump 6. After the hydraulic oil is used to meet the working of the steering system, the excess hydraulic oil is transported to the working hydraulic system for the working hydraulic system to work, including supplying oil to the accumulator 10.

[0082] In some embodiments, as Figure 2As shown, the reversing valve 8 includes a first working oil port P1, a second working oil port P2, a third working oil port P3, a fourth working oil port P4, a fifth working oil port P5 and a sixth working oil port P6; When the reversing valve 8 is in the first working position, i.e. as Figure 1 As shown, when the reversing valve 8 is in the left working position, the first working oil port P1 is in communication with the third working oil port P3, and the second working oil port P2 is in communication with the fourth working oil port P4. At this time, the reversing valve 8 delivers hydraulic oil to the articulated steering oil cylinder 3, and the articulated steering mode is started.

[0083] When the reversing valve 8 is in the second working position, i.e. as Figure 3 As shown, when the reversing valve 8 is in the right working position, the first working oil port P1 is in communication with the fifth working oil port P5, and the second working oil port P2 is in communication with the sixth working oil port P6. At this time, the reversing valve 8 delivers hydraulic oil to the front axle steering oil cylinder 5, and the front axle steering mode is started.

[0084] In the steering hydraulic system of the high-speed loader, the reversing valve 8 is a two-position four-way electromagnetic valve. By controlling whether the reversing valve 8 is powered, the control of starting the first working position or the second working position of the reversing valve 8 is realized, which is used to realize the switching of the articulated steering and the front axle steering, and the control is convenient and fast.

[0085] In some embodiments, the reversing valve 8 is a two-position four-way electromagnetic valve, and the steering valve core 21 is a three-position four-way pilot valve. Regardless of whether the reversing valve 8 is powered, it is always in a conducting state, while the steering valve core 21 is controlled by the first electromagnetic valve 23 and the second electromagnetic valve 24 to realize the control of the working position one, the working position two and the disconnected state. In this way, when the loader does not need to steer, by controlling the first electromagnetic valve 23 and the second electromagnetic valve 24 to be in a power-off state, i.e. controlling the steering valve core 21 to be in a disconnected state, i.e. no hydraulic oil is delivered to the reversing valve 8 in the steering valve 2, the articulated steering oil cylinder 3 and the front axle steering oil cylinder 5 are both in communication with the hydraulic oil tank 7 through the reversing valve 8, and the loader does not steer.

[0086] In some embodiments, the articulated steering oil cylinder 3 includes a first articulated steering oil cylinder 31, a second articulated steering oil cylinder 32, a first hydraulic lock 33 and a second hydraulic lock 34.

[0087] When the reversing valve 8 is in the first working position, the lock control valve 9 controls the front axle steering oil cylinder 5 to be locked, and the lock control valve 9 also controls the first hydraulic lock 33 and the second hydraulic lock to be opened. The third working oil port P3 is in communication with the large cavity of the first articulated steering oil cylinder 31 and the small cavity of the second articulated steering oil cylinder 32, and the fourth working oil port P4 is in communication with the large cavity of the second articulated steering oil cylinder 32 and the small cavity of the first articulated steering oil cylinder 31. When the reversing valve 8 is in the first working position, the system starts the articulated steering mode, and at this time the articulated steering oil cylinder 3 works for steering, while the lock control valve 9 controls the front axle steering oil cylinder 5 to be locked.

[0088] When the reversing valve 8 is in the first working position, the steering valve core 21 is in the first working position or the second working position.

[0089] When the reversing valve 8 is in the first working position and the steering valve core 21 is in working position 1, the articulated steering cylinder 3 drives the loader to steer in the first direction. At this time, the working oil port 1A of the steering valve 2 delivers hydraulic oil to the second working oil port P2 of the reversing valve 8. Then, the fourth working oil port P4 of the reversing valve 8 delivers hydraulic oil to the small chamber of the first articulated steering cylinder 31 and the large chamber of the second articulated steering cylinder 32. The cylinder push rod of the first articulated steering cylinder 31 retracts, and the cylinder push rod of the second articulated steering cylinder 32 extends, and the loader steers in the first direction.

[0090] When the reversing valve 8 is in the first working position and the steering valve core 21 is in the second working position, the articulated steering cylinder 3 drives the loader to achieve a second direction of steering. At this time, the second working oil port B of the steering valve 2 delivers hydraulic oil to the first working oil port P1 of the reversing valve 8. Then, the third working oil port P2 of the reversing valve 8 delivers hydraulic oil to the large chamber of the first articulated steering cylinder 31 and the small chamber of the second articulated steering cylinder 32. The cylinder push rod of the first articulated steering cylinder 31 extends, and the cylinder push rod of the second articulated steering cylinder 32 retracts, achieving the second direction of steering of the loader. The second direction is opposite to the first direction. If the first direction is a left turn of the loader, the second direction is a right turn of the loader.

[0091] In this embodiment, the provision of the first articulated steering cylinder 31 and the second articulated steering cylinder 32 can achieve stable driving of the loader to steer, and can also achieve driving the loader to steer left or right, on the other hand.

[0092] In some embodiments, the front axle steering cylinder 5 includes a first front axle steering cylinder 51 , a second front axle steering cylinder 52 , a third hydraulic lock 53 and a fourth hydraulic lock 54 .

[0093] When the reversing valve 8 is in the second working position, the locking control valve 9 controls the locking of the articulated steering cylinder 3, and the locking control valve 9 also controls the opening of the third hydraulic lock 53 and the fourth hydraulic lock; the fifth working oil port is connected with the large chamber of the first front axle steering cylinder 51 and the small chamber of the second front axle steering cylinder 52, and the sixth working oil port is connected with the large chamber of the second front axle steering cylinder 52 and the small chamber of the first front axle steering cylinder 51.

[0094] When the reversing valve 8 is in the second working position, the steering valve core 21 is in the first working position or the second working position.

[0095] When the reversing valve 8 is in the second working position and the steering valve spool 21 is in the first working position, the front axle steering cylinder 5 drives the loader to steer in the first direction. At this time, the working oil port 1A of the steering valve 2 supplies hydraulic oil to the second working oil port P2 of the reversing valve 8. Then, the sixth working oil port P6 of the reversing valve 8 delivers hydraulic oil to the small chamber of the first front axle steering cylinder 51 and the large chamber of the second front axle steering cylinder 52. The cylinder push rod of the first front axle steering cylinder 51 retracts, and the cylinder push rod of the second front axle steering cylinder 52 extends, and the loader steers in the first direction.

[0096] When the reversing valve 8 is in the second working position and the steering valve core 21 is in the second working position, the front axle steering cylinder 5 drives the loader to achieve the second direction of steering. At this time, the second working oil port B of the steering valve 2 supplies hydraulic oil to the first working oil port P1 of the reversing valve 8. Then, the fourth working oil port P4 of the reversing valve 8 delivers hydraulic oil to the large chamber of the first front axle steering cylinder 51 and the small chamber of the second front axle steering cylinder 52. The cylinder push rod of the first front axle steering cylinder 51 extends, and the cylinder push rod of the second front axle steering cylinder 52 retracts, and the loader achieves the second direction of steering. The second direction is opposite to the first direction. If the first direction is the loader turning left, then the second direction is the loader turning right.

[0097] In this embodiment, the provision of the first front axle steering cylinder 51 and the second front axle steering cylinder 52 can achieve stable driving of the loader to steer, and can also drive the loader to steer left or right, on the other hand.

[0098] In some embodiments, as Figure 3 As shown, the first hydraulic lock 33 includes a hydraulic lock Y1 and a hydraulic lock Y2. The hydraulic lock Y1 is arranged on the large chamber oil port of the first articulated steering cylinder 31, and the hydraulic lock Y2 is arranged on the small chamber oil port of the first articulated steering cylinder 31.

[0099] The second hydraulic lock 34 includes a hydraulic lock Y4 and a hydraulic lock Y3 . The hydraulic lock Y4 is arranged on the large-cavity oil port of the second articulated steering cylinder 32 , and the hydraulic lock Y3 is arranged on the small-cavity oil port of the second articulated steering cylinder 32 .

[0100] The third hydraulic lock 53 includes a hydraulic lock V1 and a hydraulic lock V2 . The hydraulic lock V1 is provided on the large-cavity oil port of the first front axle steering cylinder 51 , and the hydraulic lock V2 is provided on the small-cavity oil port of the first front axle steering cylinder 51 .

[0101] The fourth hydraulic lock 54 includes a hydraulic lock V4 and a hydraulic lock V3 . The hydraulic lock V4 is provided on the large-cavity oil port of the second front axle steering cylinder 52 , and the hydraulic lock V3 is provided on the small-cavity oil port of the second front axle steering cylinder 52 .

[0102] The lock control valve 9 includes a fluid inlet A2, a fluid return port A1, a first control port A3, and a second control port A4. The fluid inlet A2 is connected to the accumulator 10, which is supplied with oil from the working hydraulic system. The fluid return port A1 is connected to the hydraulic oil tank 7. The first control port A3 controls the opening and locking of the first and second hydraulic locks 33 and 34, while the second control port A4 controls the opening and locking of the third and fourth hydraulic locks 53 and 54.

[0103] Specifically: the locking control valve 9 includes a solenoid valve V5 and a solenoid valve V6. In the front axle steering mode, that is, when the reversing valve 8 is in the second working position, the solenoid valve V5 loses power, and the solenoid valve V6 loses power. Figure 2 and Figure 3 In the state shown, the return port A1 of the locking control valve 9 is connected to the second control port A4, the liquid inlet A2 of the locking control valve 9 is connected to the first control port A3, and the accumulator 10 delivers hydraulic oil to the liquid inlet A2 of the locking control valve 9. The hydraulic oil enters the first hydraulic lock 33 and the second hydraulic lock 34 through the first control port A3, that is, enters the hydraulic lock Y1, hydraulic lock Y2, hydraulic lock Y4 and hydraulic lock Y3 respectively, so that the hydraulic lock Y1, hydraulic lock Y2, hydraulic lock Y4 and hydraulic lock Y3 are disconnected, that is, the liquid inlet oil circuit and the liquid discharge oil circuit of the first articulated steering cylinder 31 and the second articulated steering cylinder 32 are both disconnected, that is, the first articulated steering cylinder 31 and the second articulated steering cylinder 32 are locked. The hydraulic lock V1, hydraulic lock V2, hydraulic lock V4 and hydraulic lock V3 are connected to the return liquid port A1 of the locking control valve 9 through the second control port A4 of the locking control valve 9, that is, connected to the hydraulic oil tank 7, and the hydraulic lock V1, hydraulic lock V2, hydraulic lock V4 and hydraulic lock V3 are connected.

[0104] In the articulated steering mode, that is, when the reversing valve 8 is in the first working position, the solenoid valve V5 is energized, pushing the valve stem of the solenoid valve V5 to the left, and the solenoid valve V6 is energized, pushing the valve stem of the solenoid valve V6 to the right. Figure 1 In the state shown, the return port A1 of the locking control valve 9 is connected to the first control port A3, the liquid inlet A2 of the locking control valve 9 is connected to the second control port A4, and the accumulator 10 delivers hydraulic oil to the liquid inlet A2 of the locking control valve 9. The hydraulic oil enters the first hydraulic lock 33 and the second hydraulic lock 34 through the second control port A4, that is, enters the hydraulic lock V1, hydraulic lock V2, hydraulic lock V4 and hydraulic lock V3 respectively, so that the hydraulic lock V1, hydraulic lock V2, hydraulic lock V4 and hydraulic lock V3 are disconnected, that is, the liquid inlet oil circuit and the liquid discharge oil circuit of the first front axle steering cylinder 51 and the second front axle steering cylinder 52 are both disconnected, that is, the first front axle steering cylinder 51 and the second front axle steering cylinder 52 are locked. The hydraulic lock Y1, hydraulic lock Y2, hydraulic lock Y4 and hydraulic lock Y3 are connected to the return liquid port A1 of the locking control valve 9 through the first control port A3 of the locking control valve 9, that is, connected to the hydraulic oil tank 7, and the hydraulic lock Y1, hydraulic lock Y2, hydraulic lock Y4 and hydraulic lock Y3 are connected.

[0105] When the loader is not steering, the solenoid V5 of the lock control valve 9 is de-energized, the solenoid V6 of the lock control valve 9 is energized, the accumulator 10 supplies oil to the lock control valve 9, and the hydraulic oil is delivered to the first control port A3 and the second control port A4 after entering the inlet port A2, so that the hydraulic locks Y1, Y2, Y4 and Y3 are disconnected, and the hydraulic locks V1, V2, V4 and V3 are also in the disconnected state, the first articulated steering oil cylinder 31 and the second articulated steering oil cylinder 32 are locked, and the first front axle steering oil cylinder 51 and the second front axle steering oil cylinder 52 are also locked. When the loader is not steering, the steering valve core 21 is in the disconnected state, and the reversing valve 8 is in the first working position or the second working position.

[0106] In addition, the steering hydraulic system of the high-speed loader also includes the articulated steering passive oil cylinder 4, which includes the first articulated steering passive oil cylinder 41 and the first articulated steering passive oil cylinder 41, and the fifth hydraulic lock 43 and the sixth hydraulic lock 44, the fifth hydraulic lock 43 includes the hydraulic locks Y5 and Y6, and the sixth hydraulic lock 44 includes the hydraulic locks Y8 and Y7. The large cavity and small cavity of the first articulated steering passive oil cylinder 41 and the large cavity and small cavity of the first articulated steering passive oil cylinder 41 are communicated with the hydraulic oil tank 7, and the first articulated steering passive oil cylinder 41 and the first articulated steering passive oil cylinder 41 are driven to act with the first articulated steering oil cylinder 31 and the first articulated steering oil cylinder 31, that is, when the first articulated steering oil cylinder 31 and the first articulated steering oil cylinder 31 act, the first articulated steering passive oil cylinder 41 and the first articulated steering passive oil cylinder 41 are dragged to act. The hydraulic locks Y5, Y6, Y7 and Y8 are locked or opened at the same time as the hydraulic locks Y1, Y2, Y4 and Y3.

[0107] A high-speed loader includes the aforementioned steering hydraulic system of the high-speed loader.

[0108] The technical means disclosed in the present application scheme is not limited to the technical means disclosed in the above-mentioned embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which are considered to be within the scope of protection of the present application.

Claims

1. A steering hydraulic system for a high-speed loader, characterized in that: Includes hydraulic oil tank, steering pump, steering valve, locking control valve, reversing valve, articulated steering cylinder and front axle steering cylinder; The reversing valve has a first working position and a second working position, the first working position is connected to the articulated steering cylinder, and the second working position is connected to the front axle steering cylinder; The locking control valve is connected to the articulated steering cylinder and the front axle steering cylinder; The steering pump delivers the hydraulic oil in the hydraulic oil tank to the steering valve, the steering valve delivers the hydraulic oil to the reversing valve, and the steering valve controls the direction of the hydraulic oil delivered to the reversing valve; When the reversing valve is in the first working position, the reversing valve delivers hydraulic oil to the articulated steering cylinder to control the articulated steering cylinder to perform steering work, and at the same time, the locking control valve controls the front axle steering cylinder to lock; When the reversing valve is in the second working position, the reversing valve delivers hydraulic oil to the front axle steering cylinder to control the front axle steering cylinder to perform steering work, and at the same time the locking control valve controls the articulated steering cylinder to lock.

2. The steering hydraulic system of a high-speed loader according to claim 1, characterized in that: The steering valve includes a steering valve core, the steering valve core has a working position 1 and a working position 2, the steering valve also includes an oil inlet, an oil return port, a working oil port 1 and a working oil port 2, the oil inlet is connected to the steering pump, the oil return port is connected to the hydraulic oil tank, and the working oil port 1 and the working oil port 2 are both connected to the reversing valve; When the steering valve core is located at the working position 1, the oil inlet is connected to the working oil port 1, and the oil return port is connected to the working oil port 2; When the steering valve core is located at the second working position, the oil inlet is communicated with the second working oil port, and the oil return port is communicated with the first working oil port.

3. The steering hydraulic system of a high-speed loader according to claim 2, characterized in that: The steering valve further includes a pressure reducing valve, a first solenoid valve, a second solenoid valve, a first shuttle valve and a second shuttle valve; The inlet of the pressure reducing valve is communicated with the oil inlet; The outlet of the pressure reducing valve is communicated with the inlet of the first solenoid valve, the outlet of the first solenoid valve is communicated with the first inlet of the first shuttle valve, the outlet of the first shuttle valve is communicated with the first pilot oil port of the steering valve core, and the first pilot oil port controls the steering valve core to operate in the working position 1; The outlet of the pressure reducing valve is also connected to the inlet of the second solenoid valve, the outlet of the second solenoid valve is connected to the first inlet of the second shuttle valve, the outlet of the second shuttle valve is connected to the second pilot oil port of the steering valve core, and the second pilot oil port controls the steering valve core to operate in the working position 2.

4. The steering hydraulic system of a high-speed loader according to claim 3, characterized in that: The steering valve further includes a third shuttle valve and a pressure sensor, wherein the pressure sensor is connected to the outlet of the third shuttle valve; the first inlet of the third shuttle valve is connected to the outlet of the first solenoid valve, and the second inlet of the third shuttle valve is connected to the outlet of the second solenoid valve.

5. The steering hydraulic system of a high-speed loader according to claim 3, characterized in that: The steering valve further includes a third solenoid valve and a fourth solenoid valve; The outlet of the pressure reducing valve is communicated with the inlet of the third solenoid valve, and the outlet of the third solenoid valve is communicated with the second inlet of the first shuttle valve; The outlet of the pressure reducing valve is also communicated with the inlet of the fourth solenoid valve, and the outlet of the fourth solenoid valve is communicated with the second inlet of the second shuttle valve.

6. The steering hydraulic system of a high-speed loader according to claim 1, characterized in that: The reversing valve includes a first working oil port, a second working oil port, a third working oil port, a fourth working oil port, a fifth working oil port and a sixth working oil port; When the reversing valve is in the first working position, the first working oil port is connected to the third working oil port, and the second working oil port is connected to the fourth working oil port; When the reversing valve is in the second working position, the first working oil port is communicated with the fifth working oil port, and the second working oil port is communicated with the sixth working oil port.

7. The steering hydraulic system of a high-speed loader according to claim 6, characterized in that: The articulated steering cylinder includes a first articulated steering cylinder, a second articulated steering cylinder, a first hydraulic lock and a second hydraulic lock; When the reversing valve is in the first working position, the locking control valve controls the locking of the front axle steering cylinder, and the locking control valve also controls the opening of the first hydraulic lock and the second hydraulic lock; the third working oil port is connected to the large chamber of the first articulated steering cylinder and the small chamber of the second articulated steering cylinder, and the fourth working oil port is connected to the large chamber of the second articulated steering cylinder and the small chamber of the first articulated steering cylinder.

8. The steering hydraulic system of a high-speed loader according to claim 7, characterized in that: The front axle steering cylinder includes a first front axle steering cylinder, a second front axle steering cylinder, a third hydraulic lock and a fourth hydraulic lock; When the reversing valve is in the second working position, the locking control valve controls the locking of the articulated steering cylinder, and the locking control valve also controls the opening of the third hydraulic lock and the fourth hydraulic lock; the fifth working oil port is connected with the large chamber of the first front axle steering cylinder and the small chamber of the second front axle steering cylinder, and the sixth working oil port is connected with the large chamber of the second front axle steering cylinder and the small chamber of the first front axle steering cylinder.

9. The steering hydraulic system of a high-speed loader according to claim 8, characterized in that: The locking control valve includes a liquid inlet, a liquid return port, a first control port and a second control port. The liquid inlet is connected to an accumulator, and the accumulator is supplied with oil by a working hydraulic system. The liquid return port is connected to a hydraulic oil tank. The first control port controls the opening and locking of the first hydraulic lock and the second hydraulic lock, and the second control port controls the opening and locking of the third hydraulic lock and the fourth hydraulic lock.

10. A high-speed loader, characterized in that: A steering hydraulic system for a high-speed loader comprising the method according to any one of claims 1 to 9.

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