Hydraulic steering system for mine car

Abstract

The application belongs to the technical field of mine cars, and discloses a hydraulic steering system for a mine car, which comprises a steering oil cylinder, a steering gear connected to the steering oil cylinder, a priority valve connected to the steering gear, a main steering pump connected to the priority valve, a main steering motor for driving the main steering pump to work, an emergency steering pump connected to the steering gear, and an emergency steering motor for driving the emergency steering pump to work, a first one-way valve is arranged between the steering gear and the priority valve, the first one-way valve allows hydraulic oil to enter the steering gear from the priority valve, a second one-way valve is arranged between the emergency steering pump and the steering gear, the second one-way valve allows hydraulic oil to enter the steering gear from the emergency steering pump, compared with the scheme in the prior art in which the mine car cannot normally steer when the priority valve fails, the hydraulic steering system ensures that the mine car can still normally steer when the priority valve of the mine car fails, thereby ensuring the safety of the mine car.

Description

Technical Field

[0001] This application belongs to the technical field of mining trucks, and specifically relates to a hydraulic steering system for mining trucks. Background Technology

[0002] Mining cars are heavy-duty transport equipment specifically designed for harsh working conditions such as mines and quarries. They are mainly used to transport materials such as ore, coal, and earth. The hydraulic steering system is the core component of a mining car, enabling it to steer flexibly.

[0003] Currently, hydraulic steering systems typically include a main steering pump, a main steering motor, a priority valve, a steering gear, and a steering cylinder. The steering motor drives the main steering pump to deliver hydraulic oil to the priority valve. The hydraulic oil then enters the steering gear through the priority valve. The steering wheel rotates the steering gear, and the hydraulic oil enters the steering cylinder according to the speed of the steering wheel rotation, thereby achieving the steering of the mine car.

[0004] To increase the reliability of mine car steering, an emergency steering assembly is typically installed. This assembly includes an emergency steering motor, an emergency steering pump, and a safety valve. The emergency steering pump is connected to a priority valve. In the event of a failure in the main steering motor or pump, the emergency steering motor drives the emergency steering pump to supply hydraulic oil to the priority valve, ensuring normal steering of the mine car. However, if the priority valve fails, the hydraulic oil supplied by both the main and emergency steering pumps cannot pass through the priority valve, rendering the mine car unable to steering. Utility Model Content

[0005] This application provides a hydraulic steering system for mine cars to ensure that the mine car can still perform steering operations when the priority valve fails.

[0006] The technical solution adopted in this application is as follows:

[0007] A hydraulic steering system for a mining truck includes a steering cylinder, a steering gear connected to the steering cylinder, a priority valve connected to the steering gear, a main steering pump connected to the priority valve, a main steering motor for driving the main steering pump, an emergency steering pump connected to the steering gear, and an emergency steering motor for driving the emergency steering pump. A first check valve is provided between the steering gear and the priority valve, allowing hydraulic oil to enter the steering gear from the priority valve. A second check valve is provided between the emergency steering pump and the steering gear, allowing hydraulic oil to enter the steering gear from the emergency steering pump.

[0008] By adopting the above technical solution, when the priority valve of the mine car equipped with the hydraulic steering system of this application fails, the emergency steering motor works to drive the emergency steering pump, which in turn delivers hydraulic oil directly to the steering gear to ensure the steering needs of the mine car. Compared with the prior art solution where the mine car cannot turn normally due to the failure of the priority valve, this solution ensures that the mine car can still turn normally when the priority valve fails, thus ensuring the safety of the mine car.

[0009] In addition, a first check valve is installed between the steering gear and the priority valve. This first check valve allows hydraulic oil to enter the steering gear from the priority valve, thereby preventing hydraulic oil from entering the priority valve when the emergency steering pump supplies hydraulic oil to the steering gear, thus ensuring the smoothness and efficiency of the mine car's steering. Furthermore, a second check valve is installed between the emergency steering pump and the steering gear. This second check valve allows hydraulic oil to enter the steering gear from the emergency steering pump, thereby preventing hydraulic oil from flowing into the emergency steering pump when the main steering pump supplies hydraulic oil to the steering gear, thus similarly ensuring the smoothness and efficiency of the mine car's steering.

[0010] Optionally, the main steering pump has a first oil outlet branch and a second oil outlet branch, the first oil outlet branch being connected to the priority valve and the second oil outlet branch being connected to the steering gear.

[0011] By adopting the above technical solution, since the main steering pump has a first oil outlet branch and a second oil outlet branch, the first oil outlet branch is connected to the priority valve and the second oil outlet branch is connected to the steering gear. Therefore, when the priority valve fails, the main steering pump can directly supply hydraulic oil to the steering gear through the second oil outlet branch, thereby providing multiple emergency steering solutions for the mine car and further improving the safety of the mine car. When the main steering pump or the main steering motor fails, the emergency steering motor drives the emergency steering pump to work, so that the emergency steering pump supplies hydraulic oil to the steering gear, thereby ensuring the normal steering function of the mine car and further increasing the safety of the mine car.

[0012] Optionally, the main steering pump is provided with an oil outlet manifold, the oil outlet manifold is provided with a first three-way valve, one oil outlet of the first three-way valve is provided with a first oil outlet pipe connected to the priority valve, and the other oil outlet of the first three-way valve is provided with a second oil outlet pipe connected to the steering gear.

[0013] By adopting the above technical solution, when the priority valve is working normally, the first three-way valve is in the state of connecting the main oil outlet pipe and the first oil outlet pipe, thereby enabling the main steering pump to deliver hydraulic oil to the priority valve; when the priority valve malfunctions, the first three-way valve switches to the state of connecting the main oil outlet pipe and the second oil outlet pipe, thereby enabling the main steering pump to directly deliver hydraulic oil to the steering gear.

[0014] Because one outlet of the first three-way valve is connected to the first outlet pipe of the priority valve, and the other outlet of the first three-way valve is connected to the second outlet pipe of the steering gear, the flow direction of the hydraulic oil can be controlled by the first three-way valve, so that the flow direction of the hydraulic oil can be switched between the first outlet pipe and the second outlet pipe. This makes it easier to control the flow direction of the hydraulic oil, while reducing the difficulty of connecting the main steering pump, the priority valve and the steering gear, thereby reducing the production difficulty and production cost of the hydraulic steering system.

[0015] Optionally, a four-way connector is provided between the steering gear and the first one-way valve. One port of the four-way connector is connected to the steering gear, another port of the four-way connector is connected to the first one-way valve, yet another port of the four-way connector is connected to the second oil outlet pipe, and the last port of the four-way connector is connected to the second one-way valve.

[0016] By adopting the above technical solution, since one interface of the four-way connector is connected to the steering gear, another interface of the four-way connector is connected to the check valve, yet another interface of the four-way connector is connected to the second oil outlet pipe, and the last interface of the four-way connector is connected to the second check valve, the difficulty of connecting the main steering pump, emergency steering pump, and priority valve to the steering gear is reduced, thereby reducing the production difficulty and production cost of the hydraulic steering system.

[0017] Optionally, the main oil outlet pipe includes a first section connected to the main steering pump and a second section connected to the first three-way valve. A second three-way valve is provided between the first section and the second section. The oil inlet of the second three-way valve is connected to the first section, one oil outlet of the second three-way valve is connected to the second section, and the other oil outlet of the second three-way valve is connected to the lifting system.

[0018] By adopting the above technical solution, when the priority valve functions normally, the second three-way valve is in the state where the first and second sections are connected, and the first on-off valve is in the state where the second section is connected to the priority valve, so that the main steering pump can directly deliver hydraulic oil to the priority valve; when the priority valve malfunctions and the mine car's jacking system needs to work, the second three-way valve is in the state where the first section is connected to the jacking system, so that the main steering pump can directly deliver hydraulic oil to the jacking system to ensure the normal operation of the jacking system, thereby ensuring the normal operation of the vehicle's jacking function. When the mine car needs to turn, the second three-way valve is in the state where the first and second sections are connected, and the first three-way valve is in the state where the second section is connected to the second oil outlet pipe, so that the main steering pump can directly deliver hydraulic oil to the steering gear to ensure the normal operation of the mine car's steering function.

[0019] In summary, the hydraulic steering system in this application not only ensures the normal operation of the mine car's steering function when the priority valve fails, but also ensures the normal operation of the mine car's lifting system, thereby increasing the flexibility of the hydraulic steering system.

[0020] Optionally, the priority valve is connected to the lifting system via a lifting pipeline, and the other outlet of the second three-way valve is connected to the lifting pipeline. A third check valve is provided between the connection point of the second three-way valve and the lifting pipeline and the priority valve, and the third check valve allows hydraulic oil to enter the lifting system from the priority valve.

[0021] By adopting the above technical solution, since a third check valve is set between the connection position of the second three-way valve and the lifting pipeline and the priority valve, and the third check valve allows hydraulic oil to enter the lifting system through the priority valve, the situation of hydraulic oil flowing into the priority valve is avoided when the main steering pump directly delivers hydraulic oil to the lifting system. This ensures the smoothness and efficiency of the lifting system in lifting the cargo box.

[0022] Optionally, a third three-way valve is provided between the emergency steering pump and the second check valve. The oil inlet of the third three-way valve is connected to the emergency steering pump, one oil outlet of the third three-way valve is connected to the second check valve, and the other oil outlet of the third three-way valve is connected to the lifting system.

[0023] By adopting the above technical solution, when the priority valve and the main steering pump malfunction and the cargo box needs to be lifted, the third three-way valve switches to the state where the emergency steering pump is connected to the lifting system. This allows the emergency steering pump to directly supply hydraulic oil to the lifting system, ensuring the normal operation of the mine car's lifting function. Alternatively, if the priority valve is blocked, resulting in a small flow of hydraulic oil entering the lifting system through the priority valve, the emergency steering pump can also be used to supply hydraulic oil to the lifting system, ensuring the smoothness and efficiency of the lifting system in lifting the cargo box.

[0024] When the main steering pump fails, the third three-way valve switches to the state where the emergency steering pump is connected to the steering gear, so that the emergency steering pump can directly deliver hydraulic oil to the steering gear to ensure that the steering function of the mine car is normal.

[0025] In summary, the hydraulic steering system in this application not only increases the safety of the mine car, but also provides multiple oil supply options for the mine car's lifting system to ensure the normal operation of the mine car's lifting function.

[0026] Optionally, a third three-way valve is provided between the second one-way valve and the steering gear. The oil inlet of the third three-way valve is connected to the second one-way valve, one oil outlet of the third three-way valve is connected to the steering gear, and the other oil outlet of the third three-way valve is connected to the lifting system.

[0027] By adopting the above technical solution, since the third three-way valve is located between the second check valve and the steering gear, the situation where hydraulic oil enters the emergency steering pump when the main steering pump supplies hydraulic oil to the lifting system is avoided, thereby ensuring the smoothness and efficiency of the mine car lifting the cargo box.

[0028] Optionally, a safety valve is provided between the second check valve and the emergency steering pump, and the oil inlet of the safety valve is connected to the pipeline between the emergency steering pump and the second check valve.

[0029] By adopting the above technical solution, since the oil inlet of the safety valve is connected to the pipeline between the emergency steering pump and the second check valve, when the oil pressure in the pipeline between the emergency steering pump and the second check valve exceeds the threshold, the safety valve can release pressure in the pipeline to ensure the safety of the hydraulic steering system.

[0030] Optionally, the hydraulic steering system further includes an oil tank, and the oil inlet of the main steering pump, the oil inlet of the emergency steering pump, and the oil outlet of the safety valve are all connected to the oil tank.

[0031] By adopting the above technical solution, since the oil inlet of the main steering pump, the oil inlet of the emergency steering pump, and the oil outlet of the safety valve are all connected to the oil tank, on the one hand, the same oil tank is used to supply hydraulic oil to the main steering pump and the emergency steering pump, thereby reducing the cost of the hydraulic steering system. On the other hand, the hydraulic oil discharged through the safety valve can be directly returned to the oil tank to avoid the waste of hydraulic oil, thereby reducing the operating cost of the mining car.

[0032] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0033] 1. The hydraulic steering system of this application includes a steering cylinder, a steering gear connected to the steering cylinder, a priority valve connected to the steering gear, a main steering pump connected to the priority valve, a main steering motor for driving the main steering pump, an emergency steering pump connected to the steering gear, and an emergency steering motor for driving the emergency steering pump. A first check valve is provided between the steering gear and the priority valve, allowing hydraulic oil to enter the steering gear from the priority valve. A second check valve is provided between the emergency steering pump and the steering gear, allowing hydraulic oil to enter the steering gear from the emergency steering pump. When the priority valve of the mine car equipped with the hydraulic steering system of this application fails, the emergency steering motor operates to drive the emergency steering pump, thereby enabling the emergency steering pump to directly deliver hydraulic oil to the steering gear to ensure the steering requirements of the mine car. Compared with the prior art where a failure of the priority valve causes the mine car to be unable to turn normally, this system ensures that the mine car can still turn normally when the priority valve fails, thus ensuring the safety of the mine car.

[0034] 2. The main steering pump in this application has a first oil outlet branch and a second oil outlet branch. The first oil outlet branch is connected to the priority valve, and the second oil outlet branch is connected to the steering gear. Thus, when the priority valve fails, the main steering pump can directly supply hydraulic oil to the steering gear through the second oil outlet branch, thereby providing multiple emergency steering solutions for the mine car to further improve the safety of the mine car. When the main steering pump or the main steering motor fails, the emergency steering motor drives the emergency steering pump to work, so that the emergency steering pump delivers hydraulic oil to the steering gear, thereby ensuring the normal steering function of the mine car and further increasing the safety of the mine car.

[0035] 3. The main steering pump in this application is provided with an oil outlet manifold at its outlet, and the oil outlet manifold is provided with a first three-way valve. One outlet of the first three-way valve is provided with a first oil outlet pipe connected to a priority valve, and the other outlet of the first three-way valve is provided with a second oil outlet pipe connected to the steering gear. When the priority valve is working normally, the first three-way valve is in the state of connecting the oil outlet manifold and the first oil outlet pipe, thereby enabling the main steering pump to deliver hydraulic oil to the priority valve. When the priority valve malfunctions, the first three-way valve switches to the state of connecting the oil outlet manifold and the second oil outlet pipe, thereby enabling the main steering pump to directly deliver hydraulic oil to the steering gear. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0037] Figure 1 This is a schematic diagram of the hydraulic steering system described in one embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the hydraulic steering system described in another embodiment of this application.

[0039] Figure label:

[0040] 1. Steering cylinder; 2. Steering gear; 3. Priority valve; 31. First check valve; 32. Second check valve; 4. Main steering pump; 41. First oil outlet branch; 42. Second oil outlet branch; 43. First three-way valve; 44. Second three-way valve; 5. Main steering motor; 6. Emergency steering pump; 61. Third three-way valve; 7. Emergency steering motor; 8. Lifting system; 81. Third check valve; 9. Safety valve; 10. Oil tank. Detailed Implementation

[0041] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0042] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0043] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can 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. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0046] Reference Figure 1 and Figure 2 A hydraulic steering system for a mining truck is disclosed, comprising a steering cylinder 1, a steering gear 2 connected to the steering cylinder 1, a priority valve 3 connected to the steering gear 2, a main steering pump 4 connected to the priority valve 3, a main steering motor 5 for driving the main steering pump 4, an emergency steering pump 6 connected to the steering gear 2, and an emergency steering motor 7 for driving the emergency steering pump 6. A first check valve 31 is provided between the steering gear 2 and the priority valve 3, allowing hydraulic oil to enter the steering gear 2 from the priority valve 3. A second check valve 32 is provided between the emergency steering pump 6 and the steering gear 2, allowing hydraulic oil to enter the steering gear 2 from the emergency steering pump 6.

[0047] Understandably, the main steering motor 5 is driven by the main steering pump 4, enabling the main steering pump 4 to deliver hydraulic oil under the drive of the main steering motor 5; the emergency steering motor 7 is driven by the emergency steering pump 6, enabling the emergency steering pump 6 to deliver hydraulic oil under the drive of the emergency steering motor 7; the first check valve 31 only allows hydraulic oil to enter the steering gear 2 through the priority valve 3, while hydraulic oil cannot enter the priority valve 3 through the steering gear 2; the second check valve 32 only allows hydraulic oil to enter the steering gear 2 through the emergency steering pump 6, while hydraulic oil cannot enter the emergency steering pump 6 through the steering gear 2.

[0048] When the priority valve 3 of the mine car equipped with the hydraulic steering system of this application malfunctions, the emergency steering motor 7 operates to drive the emergency steering pump 6, which in turn delivers hydraulic oil directly to the steering gear 2 to ensure the steering requirements of the mine car. Compared with the prior art where the mine car cannot turn normally due to the failure of the priority valve 3, this ensures that the mine car can still turn normally when the priority valve 3 malfunctions, thus ensuring the safety of the mine car.

[0049] Furthermore, since a first check valve 31 is provided between the steering gear 2 and the priority valve 3, the first check valve 31 allows hydraulic oil to enter the steering gear 2 through the priority valve 3, thereby preventing the hydraulic oil from entering the priority valve 3 when the emergency steering pump 6 supplies hydraulic oil to the steering gear 2, thus ensuring the smoothness and efficiency of the mine car's steering. Also, since a second check valve 32 is provided between the emergency steering pump 6 and the steering gear 2, the second check valve 32 allows hydraulic oil to enter the steering gear 2 through the emergency steering pump 6, thereby preventing the hydraulic oil from flowing into the emergency steering pump 6 when the main steering pump 4 supplies hydraulic oil to the steering gear 2, thus similarly ensuring the smoothness and efficiency of the mine car's steering.

[0050] This application does not impose specific limitations on the transmission connection method between the main steering motor 5 and the main steering pump 4, nor on the transmission connection method between the emergency steering motor 7 and the emergency steering pump 6; existing methods may be referenced.

[0051] In a preferred embodiment, refer to Figure 2 The main steering pump 4 has a first oil outlet branch 41 and a second oil outlet branch 42. The first oil outlet branch 41 is connected to the priority valve 3, and the second oil outlet branch 42 is connected to the steering gear 2.

[0052] It is understandable that the first oil outlet branch 41 can connect the main steering pump 4 to the priority valve 3, and the second oil outlet branch 42 can connect the main steering pump 4 to the steering gear 2.

[0053] Since the main steering pump 4 has a first oil outlet branch 41 and a second oil outlet branch 42, the first oil outlet branch 41 is connected to the priority valve 3 and the second oil outlet branch 42 is connected to the steering gear 2. Thus, when the priority valve 3 fails, the main steering pump 4 can directly supply hydraulic oil to the steering gear 2 through the second oil outlet branch 42, thereby providing multiple emergency steering solutions for the mine car and further improving the safety of the mine car. When the main steering pump 4 or the main steering motor 5 fails, the emergency steering motor 7 drives the emergency steering pump 6 to work, so that the emergency steering pump 6 delivers hydraulic oil to the steering gear 2, thereby ensuring the normal steering function of the mine car and further increasing the safety of the mine car.

[0054] This application does not specifically limit the formation of the first oil outlet branch 41 and the second oil outlet branch 42. Preferably, the main steering pump 4 is provided with an oil outlet main pipe at its oil outlet, and the oil outlet main pipe is provided with a first three-way valve 43. One oil outlet of the first three-way valve 43 is provided with a first oil outlet pipe connected to the priority valve 3, and the other oil outlet of the first three-way valve 43 is provided with a second oil outlet pipe connected to the steering gear 2.

[0055] Understandably, one end of the main oil outlet pipe is connected to the oil outlet of the main steering pump 4, and the other end of the main oil outlet pipe is connected to the oil inlet of the first three-way valve 43. One end of the first oil outlet pipe is connected to one oil outlet of the first three-way valve 43, and the other end of the first oil outlet pipe is connected to the oil inlet of the priority valve 3. The first oil outlet pipe forms the first oil outlet branch 41. One end of the second oil outlet pipe is connected to the other oil outlet of the first three-way valve 43, and the other end of the second oil outlet pipe is connected to the steering gear 2. The second oil outlet pipe forms the second oil outlet branch 42. The first three-way valve 43 has two states: one state is that the first three-way valve 43 connects the main oil outlet pipe to the first oil outlet pipe, and the other state is that the first three-way valve 43 connects the main oil outlet pipe to the second oil outlet pipe.

[0056] When the priority valve 3 is working normally, the first three-way valve 43 is in the state of connecting the main oil outlet pipe with the first oil outlet pipe, thereby enabling the main steering pump 4 to deliver hydraulic oil to the priority valve 3; when the priority valve 3 malfunctions, the first three-way valve 43 switches to the state of connecting the main oil outlet pipe with the second oil outlet pipe, thereby enabling the main steering pump 4 to directly deliver hydraulic oil to the steering gear 2.

[0057] Since one outlet of the first three-way valve 43 is connected to the first oil outlet pipe of the priority valve 3, and the other outlet of the first three-way valve 43 is connected to the second oil outlet pipe of the steering gear 2, the flow direction of the hydraulic oil can be controlled by the first three-way valve 43, so that the flow direction of the hydraulic oil can be switched between the first oil outlet pipe and the second oil outlet pipe, thereby achieving the effect of facilitating the control of the flow direction of the hydraulic oil. At the same time, it reduces the difficulty of connecting the main steering pump 4 with the priority valve 3 and the steering gear 2, thereby reducing the production difficulty and production cost of the hydraulic steering system.

[0058] In other embodiments, the design of the main oil outlet pipe can be omitted, and the oil inlet of the first three-way valve 43 can be directly connected to the oil outlet of the main steering pump 4. The first oil outlet pipe also constitutes the first oil outlet branch 41, and the second oil outlet pipe also constitutes the second oil outlet branch 42.

[0059] This application does not specifically limit the connection method between the first one-way valve 31, the second one-way valve 32, and the second oil outlet pipe and the steering gear 2. Preferably, a four-way connector is provided between the steering gear 2 and the first one-way valve 31. One port of the four-way connector is connected to the steering gear 2, another port of the four-way connector is connected to the first one-way valve 31, another port of the four-way connector is connected to the second oil outlet pipe, and the last port of the four-way connector is connected to the second one-way valve 32. This reduces the difficulty of connecting the main steering pump 4, the emergency steering pump 6, and the priority valve 3 to the steering gear 2, thereby reducing the production difficulty and production cost of the hydraulic steering system.

[0060] It is understandable that the four-way connector is connected to the first one-way valve 31, the second one-way valve 32, and the priority valve 3 respectively through connecting pipes.

[0061] In other implementation examples, two T-connectors are provided on the pipeline connecting the steering gear 2 and the priority valve 3. One T-connector is connected to the second oil outlet pipe, and the other T-connector is connected to the second check valve 32, so as to achieve the same connection between the first check valve 31, the second check valve 32 and the second oil outlet pipe and the steering gear 2.

[0062] In a preferred embodiment, refer to Figure 2 The main oil outlet pipe includes a first section connected to the main steering pump 4 and a second section connected to the first three-way valve 43. A second three-way valve 44 is provided between the first section and the second section. The oil inlet of the second three-way valve 44 is connected to the first section, one oil outlet of the second three-way valve 44 is connected to the second section, and the other oil outlet of the second three-way valve 44 is connected to the lifting system 8.

[0063] It is understandable that the lifting system 8 is connected to the priority valve 3 through the lifting pipeline so that hydraulic oil can enter the lifting system 8 through the lifting pipeline; the second three-way valve 44 has two states, one state is that the second three-way valve 44 connects the first section to the lifting system 8, and the other state is that the second three-way valve 44 connects the first section to the second section.

[0064] When the priority valve 3 functions normally, the second three-way valve 44 is in a state where the first and second sections are connected, and the first on-off valve is in a state where the second section is connected to the priority valve 3, so that the main steering pump 4 can directly supply hydraulic oil to the priority valve 3. When the priority valve 3 malfunctions and the mine car's lifting system 8 needs to work, the second three-way valve 44 is in a state where the first section is connected to the lifting system 8, so that the main steering pump 4 can directly supply hydraulic oil to the lifting system 8 to ensure the normal operation of the lifting system 8, thereby ensuring the normal operation of the vehicle's lifting function. When the mine car needs to turn, the second three-way valve 44 is in a state where the first and second sections are connected, and the first three-way valve 43 is in a state where the second section is connected to the second oil outlet pipe, so that the main steering pump 4 can directly supply hydraulic oil to the steering gear 2 to ensure the normal operation of the mine car's steering function.

[0065] In summary, the hydraulic steering system in this application not only ensures the normal operation of the mine car's steering function when the priority valve 3 fails, but also ensures the normal operation of the mine car's lifting system 8, thereby increasing the flexibility of the hydraulic steering system.

[0066] Furthermore, refer to Figure 2The priority valve 3 is connected to the lifting system 8 through the lifting pipeline. The other oil outlet of the second three-way valve 44 is connected to the lifting pipeline. A third check valve 81 is provided between the connection position of the second three-way valve 44 and the lifting pipeline and the priority valve 3. The third check valve 81 allows hydraulic oil to enter the lifting system 8 through the priority valve 3.

[0067] Understandably, the third check valve 81 can only allow hydraulic oil to enter the lifting system 8 through the priority valve 3, while hydraulic oil cannot enter the priority valve 3 through the lifting system 8.

[0068] Because a third check valve 81 is provided between the connection point of the second three-way valve 44 and the lifting pipeline and the priority valve 3, and the third check valve 81 allows hydraulic oil to enter the lifting system 8 through the priority valve 3, the hydraulic oil is prevented from flowing into the priority valve 3 when the main steering pump 4 directly delivers hydraulic oil to the lifting system 8, thereby ensuring the smoothness and efficiency of the lifting system 8 in lifting the cargo box.

[0069] To ensure that the jacking system 8 of the mine car can still function normally in the event of a failure of the priority valve 3 or the main steering pump 4, the following implementation method can also be adopted in this application:

[0070] In the first embodiment, a third three-way valve 61 is provided between the emergency steering pump 6 and the second check valve 32. The oil inlet of the third three-way valve 61 is connected to the emergency steering pump 6, one oil outlet of the third three-way valve 61 is connected to the second check valve 32, and the other oil outlet of the third three-way valve 61 is connected to the lifting system 8.

[0071] Understandably, the third three-way valve 61 has two states: one state is that the third three-way valve 61 connects the second one-way valve 32 to the steering gear 2, and the other state is that the third three-way valve 61 connects the second one-way valve 32 to the lifting system 8.

[0072] When the priority valve 3 and the main steering pump 4 malfunction and the cargo box needs to be lifted, the third three-way valve 61 switches to the state where the second check valve 32 is connected to the lifting system 8, thereby enabling the emergency steering pump 6 to directly supply hydraulic oil to the lifting system 8 to ensure the normal operation of the mine car's lifting function. Alternatively, if the priority valve 3 is blocked, resulting in a small flow of hydraulic oil entering the lifting system 8 through the priority valve 3, the emergency steering pump 6 can also be used to supply hydraulic oil to the lifting system 8 to ensure the smoothness and efficiency of the lifting system 8 in lifting the cargo box.

[0073] When the main steering pump 4 malfunctions, the third three-way valve 61 switches to the state where the second check valve 32 is connected to the steering gear 2, thereby enabling the emergency steering pump 6 to directly deliver hydraulic oil to the steering gear 2 to ensure the normal operation of the mine car's steering function.

[0074] In summary, the hydraulic steering system in this application not only increases the safety of the mine car, but also provides multiple oil supply schemes for the mine car's lifting system 8 to ensure the normal operation of the mine car's lifting function.

[0075] Implementation Method Two: In this implementation method, refer to... Figure 2 A third three-way valve 61 is provided between the second one-way valve 32 and the steering gear 2. The oil inlet of the third three-way valve 61 is connected to the second one-way valve 32, one oil outlet of the third three-way valve 61 is connected to the steering gear 2, and the other oil outlet of the third three-way valve 61 is connected to the lifting system 8.

[0076] It is understandable that the third three-way valve 61 has two states. In one state, the third three-way valve 61 connects the second one-way valve 32 to the lifting system 8, and in the other state, the third three-way valve 61 connects the second one-way valve 32 to the steering gear 2.

[0077] Since the third three-way valve 61 is located between the second one-way valve 32 and the steering gear 2, it avoids the situation where hydraulic oil enters the emergency steering pump 6 when the main steering pump 4 supplies hydraulic oil to the lifting system 8, thereby ensuring the smoothness and efficiency of the mine car lifting the cargo box.

[0078] In a preferred embodiment, refer to Figure 1 and Figure 2 A safety valve 9 is provided between the second check valve 32 and the emergency steering pump 6. The oil inlet of the safety valve 9 is connected to the pipeline between the emergency steering pump 6 and the second check valve 32.

[0079] Since the oil inlet of safety valve 9 is connected to the pipeline between emergency steering pump 6 and second check valve 32, when the oil pressure in the pipeline between emergency steering pump 6 and second check valve 32 exceeds the threshold, safety valve 9 can release pressure in the pipeline to ensure the safety of the hydraulic steering system.

[0080] Furthermore, the hydraulic steering system also includes an oil tank 10, and the oil inlet of the main steering pump 4, the oil inlet of the emergency steering pump 6, and the oil outlet of the safety valve 9 are all connected to the oil tank 10.

[0081] Since the oil inlet of the main steering pump 4, the oil inlet of the emergency steering pump 6, and the oil outlet of the safety valve 9 are all connected to the oil tank 10, on the one hand, the same oil tank 10 is used to supply hydraulic oil to the main steering pump 4 and the emergency steering pump 6, thereby reducing the cost of the hydraulic steering system. On the other hand, the hydraulic oil discharged through the safety valve 9 can return directly to the oil tank 10 to avoid the waste of hydraulic oil, thereby reducing the operating cost of the mining car.

[0082] This application does not specify the connection method between the oil inlet of the main steering pump 4, the oil inlet of the emergency steering pump 6, and the oil outlet of the safety valve 9 and the oil tank 10, and can refer to the prior art.

[0083] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0084] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0085] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A hydraulic steering system for mining cars, characterized in that, The system includes a steering cylinder (1), a steering gear (2) connected to the steering cylinder (1), a priority valve (3) connected to the steering gear (2), a main steering pump (4) connected to the priority valve (3), a main steering motor (5) for driving the main steering pump (4), an emergency steering pump (6) connected to the steering gear (2), and an emergency steering motor (7) for driving the emergency steering pump (6). A first check valve (31) is provided between the steering gear (2) and the priority valve (3), which allows hydraulic oil to enter the steering gear (2) through the priority valve (3). A second check valve (32) is provided between the emergency steering pump (6) and the steering gear (2), which allows hydraulic oil to enter the steering gear (2) through the emergency steering pump (6).

2. The hydraulic steering system for mining cars according to claim 1, characterized in that, The main steering pump (4) has a first oil outlet branch (41) and a second oil outlet branch (42), the first oil outlet branch (41) being connected to the priority valve (3) and the second oil outlet branch (42) being connected to the steering gear (2).

3. A hydraulic steering system for mining cars according to claim 2, characterized in that, The main steering pump (4) is provided with an oil outlet manifold, and the oil outlet manifold is provided with a first three-way valve (43). One oil outlet of the first three-way valve (43) is provided with a first oil outlet pipe connected to the priority valve (3), and the other oil outlet of the first three-way valve (43) is provided with a second oil outlet pipe connected to the steering gear (2).

4. A hydraulic steering system for mining cars according to claim 3, characterized in that, A four-way connector is provided between the steering gear (2) and the first one-way valve (31). One port of the four-way connector is connected to the steering gear (2), another port of the four-way connector is connected to the first one-way valve (31), yet another port of the four-way connector is connected to the second oil outlet pipe, and the last port of the four-way connector is connected to the second one-way valve (32).

5. A hydraulic steering system for mining cars according to claim 3, characterized in that, The main oil outlet pipe includes a first section connected to the main steering pump (4) and a second section connected to the first three-way valve (43). A second three-way valve (44) is provided between the first section and the second section. The oil inlet of the second three-way valve (44) is connected to the first section, one oil outlet of the second three-way valve (44) is connected to the second section, and the other oil outlet of the second three-way valve (44) is connected to the lifting system (8).

6. A hydraulic steering system for mining cars according to claim 5, characterized in that, The priority valve (3) is connected to the lifting system (8) through the lifting pipeline. The other oil outlet of the second three-way valve (44) is connected to the lifting pipeline. A third check valve (81) is provided between the connection position of the second three-way valve (44) and the lifting pipeline and the priority valve (3). The third check valve (81) allows hydraulic oil to enter the lifting system (8) from the priority valve (3).

7. A hydraulic steering system for mining cars according to any one of claims 1-6, characterized in that, A third three-way valve (61) is provided between the emergency steering pump (6) and the second check valve (32). The oil inlet of the third three-way valve (61) is connected to the emergency steering pump (6), one oil outlet of the third three-way valve (61) is connected to the second check valve (32), and the other oil outlet of the third three-way valve (61) is connected to the lifting system (8).

8. A hydraulic steering system for mining cars according to any one of claims 1-6, characterized in that, A third three-way valve (61) is provided between the second one-way valve (32) and the steering gear (2). The oil inlet of the third three-way valve (61) is connected to the second one-way valve (32), one oil outlet of the third three-way valve (61) is connected to the steering gear (2), and the other oil outlet of the third three-way valve (61) is connected to the lifting system (8).

9. A hydraulic steering system for mining cars according to any one of claims 1-6, characterized in that, A safety valve (9) is provided between the second check valve (32) and the emergency steering pump (6), and the oil inlet of the safety valve (9) is connected to the pipeline between the emergency steering pump (6) and the second check valve (32).

10. A hydraulic steering system for mining cars according to claim 9, characterized in that, The hydraulic steering system also includes an oil tank (10), and the oil inlet of the main steering pump (4), the oil inlet of the emergency steering pump (6), and the oil outlet of the safety valve (9) are all connected to the oil tank (10).

Images