Hydraulic steering system and mining dump truck

Abstract

The utility model relates to the technical field of steering systems, in particular to a hydraulic steering system and a mining dump truck. The hydraulic steering system comprises a steering mechanism, a hydraulic pump, an energy accumulator and an electric pump, wherein the steering mechanism is used for controlling the steering of the mining dump truck; the hydraulic pump is used for pumping hydraulic oil in the oil tank to the oil inlet end of the steering mechanism through the first oil way. The energy accumulator is communicated with the first oil way and used for conveying hydraulic oil stored by the energy accumulator to the oil inlet end of the steering mechanism through the first oil way when the hydraulic pump breaks down. The electric pump communicates with the first oil way and is used for pumping hydraulic oil in the oil tank to the oil inlet end of the steering mechanism through the first oil way after a switch of the electric pump is started. According to the hydraulic steering system, it can be guaranteed that when the hydraulic pump breaks down, a driver has enough time to start the switch of the electric pump, and therefore the reliability of emergency steering of the hydraulic steering system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steering systems, in particular to a hydraulic steering system and a mining dump truck. Background Art

[0002] The hydraulic steering system of a mining dump truck uses a hydraulic power system to drive the steering gear, which then acts on the steering cylinder to achieve vehicle steering. However, if the hydraulic power system fails and the hydraulic oil is cut off, the emergency steering system is required to provide power to drive the steering gear.

[0003] Existing hydraulic steering systems often use accumulators or electric pumps to implement emergency steering. Accumulators, however, store little hydraulic energy, so the duration of hydraulic energy they can provide during emergency steering is short. Electric pumps, on the other hand, require manual activation by the driver, which can easily lead to panic, fear, and other factors preventing the driver from immediately activating the electric pump. Consequently, existing hydraulic steering systems suffer from low reliability and pose safety risks. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] To this end, the utility model provides a hydraulic steering system that can ensure that when the hydraulic pump fails, the driver has enough time to start the electric pump switch, thereby improving the reliability of the emergency steering of the hydraulic steering system, thereby improving the safety and reliability of the steering action of the entire hydraulic steering system.

[0006] The utility model also provides a mining dump truck comprising the hydraulic steering system.

[0007] A hydraulic steering system according to an embodiment of the first aspect of the present invention is applied to a mining dump truck, comprising:

[0008] Steering mechanism, used to control the steering of mining dump trucks;

[0009] A hydraulic pump, used to pump the hydraulic oil in the oil tank to the oil inlet end of the steering mechanism through the first oil circuit;

[0010] an accumulator, connected to the first oil circuit, for delivering the stored hydraulic oil to the oil inlet end of the steering mechanism through the first oil circuit when the hydraulic pump fails;

[0011] The electric pump is connected to the first oil circuit and is used to pump the hydraulic oil in the oil tank to the oil inlet end of the steering mechanism through the first oil circuit after the switch of the electric pump is started.

[0012] Optionally, a steering valve group is provided on the first oil circuit, the accumulator is connected to the steering valve group through the second oil circuit, and the steering mechanism is connected to the steering valve group through the third oil circuit; the steering valve group is used to allow the hydraulic oil in the first oil circuit to flow into the oil inlet end of the steering mechanism through the third oil circuit when the hydraulic pump is not faulty or the switch of the electric pump is started; the steering valve group is also used to allow the hydraulic oil delivered by the accumulator in the second oil circuit to flow into the oil inlet end of the steering mechanism through the third oil circuit when the hydraulic pump fails.

[0013] Optionally, the steering valve group is further used to allow part of the hydraulic oil in the first oil circuit to flow into the accumulator when the hydraulic pump or the electric pump pumps the hydraulic oil in the oil tank to the oil inlet end of the steering mechanism through the first oil circuit.

[0014] Optionally, the steering valve group includes:

[0015] The reversing valve, the first oil circuit, the second oil circuit and the third oil circuit are all connected to the reversing valve;

[0016] When the hydraulic pump has not failed or the switch of the electric pump is started, the reversing valve is used to connect the first oil circuit and the third oil circuit and to cut off the connection between the second oil circuit and the third oil circuit; when the hydraulic pump has failed and the switch of the electric pump is not started, the reversing valve is used to connect the second oil circuit and the third oil circuit and to cut off the connection between the first oil circuit and the third oil circuit.

[0017] Optionally, the steering valve group further includes:

[0018] A pressure measuring contact for monitoring the oil pressure in the first oil circuit;

[0019] a relief valve connected in parallel with the reversing valve via a fourth oil circuit, and the relief valve is also connected to the oil tank;

[0020] When the oil pressure monitored by the pressure measuring contact is greater than a first preset threshold, the overflow valve is used to allow the hydraulic oil in the first oil circuit to flow into the oil tank to reduce the oil pressure of the hydraulic oil in the first oil circuit.

[0021] Optionally, an oil pressure sensor is provided on the accumulator, which is used to detect the oil pressure of the hydraulic oil in the accumulator; a throttle valve is provided between the reversing valve and the accumulator; the throttle valve is used to cut off the connection between the reversing valve and the accumulator when the oil pressure detected by the oil pressure sensor is greater than a second preset threshold value.

[0022] Optionally, a shuttle valve is provided on the first oil circuit, and the electric pump is connected to the shuttle valve through the fourth oil circuit. The shuttle valve is used to maintain communication between the oil outlet end of the hydraulic pump and the steering valve group when the hydraulic pump is not faulty, and to cut off the communication between the fourth oil circuit and the first oil circuit; the shuttle valve is also used to cut off the communication between the oil outlet end of the hydraulic pump and the steering valve group when the hydraulic pump fails, and to connect the fourth oil circuit with the first oil circuit.

[0023] Optionally, a filter is provided on the first oil circuit, and the filter is used to filter the hydraulic oil pumped to the steering valve group through the first oil circuit.

[0024] Optionally, the steering mechanism includes a steering gear and a steering cylinder, the oil inlet end of the steering gear is connected to the steering valve group through a third oil circuit, and the oil outlet end of the steering gear is connected to the steering cylinder through a fifth oil circuit.

[0025] A mining dump truck according to an embodiment of the second aspect of the present invention includes the hydraulic steering system of the first aspect and various embodiments.

[0026] One of the above technical solutions has at least the following advantages or beneficial effects:

[0027] For a hydraulic steering system of an embodiment of the present invention, by providing an accumulator connected to the first oil circuit, when the hydraulic pump fails, the stored hydraulic oil can be delivered to the steering mechanism through the first oil circuit, providing the steering mechanism with hydraulic energy for a short time, and providing the driver with enough time to start the switch of the electric pump in the cab; and then by providing an electric pump connected to the first oil circuit, after the driver starts the switch of the electric pump, the electric pump can continuously pump the hydraulic oil in the oil tank to the oil inlet end of the steering mechanism through the first oil circuit, so that the steering mechanism can control the steering of the mining dump truck, thereby realizing emergency steering of the mining dump truck. It can be seen that the hydraulic steering system provided by the present application can ensure that when the hydraulic pump fails, the driver has enough time to start the switch of the electric pump, so as to improve the reliability of the emergency steering of the hydraulic steering system, thereby improving the safety and reliability of the steering action of the entire hydraulic steering system.

[0028] The mining dump truck provided by the embodiment of the present invention is provided with the above-mentioned hydraulic steering system. Since the hydraulic steering system has the above-mentioned technical effects, the mining dump truck provided with the hydraulic steering system should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A hydraulic principle diagram of a hydraulic steering system according to an embodiment of the present invention is shown.

[0030] [Description of Reference Numerals]

[0031] 1. Hydraulic pump, 2. Accumulator, 3. Electric pump, 4. First oil circuit, 5. Steering valve group, 6. Second oil circuit, 7. Third oil circuit, 8. Fuel tank, 9. Shuttle valve, 10. Fourth oil circuit, 11. Filter, 12. Steering gear, 13. Steering cylinder, 501. Reversing valve, 502. Pressure measuring contact, 503. Overflow valve, 504. Throttle valve. DETAILED DESCRIPTION

[0032] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0033] The hydraulic steering system is a series of devices used to change or maintain the driving or reverse direction of a mining dump truck. The function of the hydraulic steering system is to control the driving direction of the vehicle according to the driver's wishes.

[0034] Existing hydraulic steering systems use a hydraulic power system to drive the steering gear, which then acts on the steering cylinder to achieve vehicle steering. However, if the hydraulic power system fails, the hydraulic oil is cut off, and there is no power to drive the steering gear. Although existing hydraulic steering systems are equipped with emergency steering systems, these emergency steering systems often use accumulators or electric pumps to achieve the emergency steering function. Among them, accumulators store little hydraulic energy, so the duration of the hydraulic energy they can provide when emergency steering is required is short. Electric pumps require manual activation by the driver. Therefore, if a sudden steering failure occurs while the vehicle is running, the driver may be panicked, fearful, or unable to immediately activate the electric pump. Therefore, existing hydraulic steering systems all have safety hazards related to emergency steering systems.

[0035] In order to solve at least one of the technical problems existing in the prior art or related art, the present invention provides a hydraulic steering system, which includes a steering mechanism, a hydraulic pump, an accumulator, and an electric pump. The steering mechanism is used to control the steering of a mining dump truck; the hydraulic pump is used to pump hydraulic oil in a tank to the oil inlet end of the steering mechanism through a first oil circuit; the accumulator is connected to the first oil circuit and is used to deliver its stored hydraulic oil to the steering mechanism through the first oil circuit when the hydraulic pump fails; the electric pump is connected to the first oil circuit and is used to pump hydraulic oil in the tank to the oil inlet end of the steering mechanism through the first oil circuit after the electric pump switch is activated. The hydraulic steering system provided by the utility model can ensure that when the hydraulic pump fails, the driver has sufficient time to activate the electric pump switch, thereby improving the reliability of the emergency steering of the hydraulic steering system, thereby improving the safety and reliability of the steering action of the entire hydraulic steering system.

[0036] The following describes a hydraulic steering system and a mining dump truck according to some embodiments of the present invention with reference to the accompanying drawings.

[0037] See also Figure 1The utility model provides a hydraulic steering system according to an embodiment, which is applied to a mining dump truck and includes a steering mechanism, a hydraulic pump 1, an accumulator 2 and an electric pump 3. The steering mechanism is used to control the steering of the mining dump truck; the hydraulic pump 1 is used to pump the hydraulic oil in the oil tank 8 to the oil inlet end of the steering mechanism through the first oil circuit 4; the accumulator 2 is connected to the first oil circuit 4, and is used to deliver the stored hydraulic oil to the oil inlet end of the steering mechanism through the first oil circuit 4 when the hydraulic pump 1 fails; the electric pump 3 is connected to the first oil circuit 4, and is used to pump the hydraulic oil in the oil tank 8 to the oil inlet end of the steering mechanism through the first oil circuit 4 after the switch of the electric pump 3 is started.

[0038] Here, the steering mechanism may be connected to the steering wheel, so that the steering mechanism controls the steering of the mining dump truck under the drive of the steering wheel.

[0039] The electric pump 3 is an emergency steering mode that is activated when the hydraulic pump 1 fails, there is no hydraulic oil supply, the steering system loses power and the steering mechanism fails; the switch of the electric pump 3 is a control component for manually operating the steering, such as a manual button, and the switch is set in the cab.

[0040] It should be noted that when the hydraulic pump 1 is not faulty, the hydraulic pump 1 can pump the hydraulic oil in the oil tank 8 to the steering mechanism through the first oil circuit 4, so that the steering mechanism can control the steering of the mining dump truck; when the hydraulic pump 1 fails, that is, when the hydraulic pump 1 is unable to pump the hydraulic oil in the oil tank 8 to the steering mechanism through the first oil circuit 4, the accumulator 2 can deliver its stored hydraulic oil to the steering mechanism through the first oil circuit 4, providing the steering mechanism with short-term hydraulic energy, thereby enabling the steering wheel connected to the steering mechanism to rotate from the left limit to the right limit, providing the driver with sufficient time to start the switch of the electric pump 3 in the cab; after the driver starts the switch of the electric pump 3, the electric pump 3 pumps the hydraulic oil in the oil tank 8 to the steering mechanism through the first oil circuit 4, continuously providing hydraulic energy to the steering mechanism, so that the steering mechanism can control the steering of the mining dump truck, thereby realizing emergency steering of the mining dump truck.

[0041] In this embodiment, by providing an accumulator 2 connected to the first oil circuit 4, when the hydraulic pump 1 fails, the stored hydraulic oil can be delivered to the steering mechanism through the first oil circuit 4, providing the steering mechanism with a short period of hydraulic energy, and providing the driver with sufficient time to start the switch of the electric pump 3 in the cab; and by providing an electric pump 3 connected to the first oil circuit 4, after the driver starts the switch of the electric pump 3, the electric pump 3 can continuously pump the hydraulic oil in the oil tank 8 to the oil inlet end of the steering mechanism through the first oil circuit 4, so that the steering mechanism can control the steering of the mining dump truck, thereby realizing emergency steering of the mining dump truck. It can be seen that the hydraulic steering system provided by the present application can ensure that when the hydraulic pump 1 fails, the driver has sufficient time to start the switch of the electric pump 3, so as to improve the reliability of the emergency steering of the hydraulic steering system, thereby improving the safety and reliability of the steering action of the entire hydraulic steering system.

[0042] In some possible embodiments, a steering valve group 5 is provided on the first oil circuit 4, the accumulator 2 is connected to the steering valve group 5 through the second oil circuit 6, and the steering mechanism is connected to the steering valve group 5 through the third oil circuit 7; the steering valve group 5 is used to allow the hydraulic oil in the first oil circuit 4 to flow into the oil inlet end of the steering mechanism through the third oil circuit 7 when the hydraulic pump 1 is not faulty or the switch of the electric pump 3 is started; the steering valve group 5 is also used to allow the hydraulic oil delivered by the accumulator 2 in the second oil circuit 6 to flow into the oil inlet end of the steering mechanism through the third oil circuit 7 when the hydraulic pump 1 fails.

[0043] It should be noted that when the hydraulic pump 1 is not faulty, the steering valve group 5 can connect the first oil circuit 4 and the third oil circuit 7, and cut off the connection between the second oil circuit 6 and the third oil circuit 7, so that the hydraulic oil pumped by the hydraulic pump 1 through the first oil circuit 4 flows into the third oil circuit 7, and then enters the oil inlet end of the steering mechanism; when the hydraulic pump 1 fails and the driver does not start the switch of the electric pump 3, the steering valve group 5 can connect the second oil circuit 6 and the third oil circuit 7, and cut off the connection between the first oil circuit 4 and the third oil circuit 7, so that the hydraulic oil in the accumulator 2 flows into the oil inlet end of the steering mechanism through the second oil circuit 6 and the third oil circuit 7; after the driver starts the switch of the electric pump 3, the steering valve group 5 can connect the first oil circuit 4 and the third oil circuit 7, and cut off the connection between the second oil circuit 6 and the third oil circuit 7, so that the hydraulic oil continuously pumped by the electric pump 3 through the first oil circuit 4 flows into the third oil circuit 7, and then enters the oil inlet end of the steering mechanism.

[0044] In this embodiment, by providing the steering valve group 5 on the first oil circuit 4, the accumulator 2 and the steering mechanism can be connected to the first oil circuit 4 respectively, which not only facilitates the connection of the entire steering system, but also reduces the length and complexity of the pipeline, thereby facilitating the installation and maintenance of the steering system.

[0045] In some possible embodiments, the steering valve group 5 is also used to allow part of the hydraulic oil in the first oil circuit 4 to flow into the accumulator 2 when the hydraulic pump 1 or the electric pump 3 pumps the hydraulic oil in the oil tank 8 to the oil inlet end of the steering mechanism through the first oil circuit 4.

[0046] When the hydraulic pump 1 pumps the hydraulic oil in the oil tank 8 to the steering valve group 5 through the first oil circuit 4, the steering valve group 5 can allow a part of the hydraulic oil to flow into the oil inlet end of the steering mechanism, and can also allow another part of the hydraulic oil to flow into the accumulator 2; when the hydraulic pump 1 fails and the switch of the electric pump 3 is started, the electric pump 3 pumps the hydraulic oil in the oil tank 8 to the steering valve group 5 through the first oil circuit 4, the steering valve group 5 can allow a part of the hydraulic oil to flow into the oil inlet end of the steering mechanism, and can also allow another part of the hydraulic oil to flow into the accumulator 2.

[0047] In this embodiment, the steering valve group 5 enables part of the hydraulic oil pumped by the hydraulic pump 1 or the electric pump 3 through the first oil circuit 4 to flow into the accumulator 2, thereby facilitating the transportation of the hydraulic oil in the accumulator 2 and the connection of the accumulator 2, thereby facilitating the installation and maintenance of the accumulator 2.

[0048] In some possible embodiments, the steering valve group 5 includes a reversing valve 501, and the first oil circuit 4, the second oil circuit 6 and the third oil circuit 7 are all connected to the reversing valve 501; when the hydraulic pump 1 is not faulty or the switch of the electric pump 3 is started, the reversing valve 501 is used to connect the first oil circuit 4 and the third oil circuit 7, and cut off the connection between the second oil circuit 6 and the third oil circuit 7; when the hydraulic pump 1 fails and the switch of the electric pump 3 is not started, the reversing valve 501 is used to connect the second oil circuit 6 and the third oil circuit 7, and cut off the connection between the first oil circuit 4 and the third oil circuit 7.

[0049] Here, the steering valve group 5 is selected as the reversing valve 501, which can connect the first oil circuit 4 and the third oil circuit 7 and cut off the connection between the second oil circuit 6 and the third oil circuit 7 when the hydraulic pump 1 is not faulty or the switch of the electric pump 3 is started, so that the hydraulic oil in the oil tank 8 is pumped to the reversing valve 501 through the first oil circuit 4 by the hydraulic pump 1 or the electric pump 3, and then flows into the oil inlet end of the steering mechanism connected to the third oil circuit 7; and when the hydraulic pump 1 fails and the switch of the electric pump 3 is not started, the second oil circuit 6 and the third oil circuit 7 are connected, and the connection between the first oil circuit 4 and the third oil circuit 7 is cut off, so that the hydraulic oil in the accumulator 2 flows into the reversing valve 501 and then flows into the oil inlet end of the steering mechanism connected to the third oil circuit 7.

[0050] In some possible embodiments, the steering valve group 5 also includes a pressure measuring contact 502 and a relief valve 503. The pressure measuring contact 502 is used to monitor the oil pressure in the first oil circuit 4. The relief valve 503 is connected in parallel with the reversing valve 501 through the fourth oil circuit 10, and the relief valve 503 is also connected to the oil tank 8. When the oil pressure monitored by the pressure measuring contact 502 is greater than the first preset threshold value, the relief valve 503 is used to allow the hydraulic oil in the first oil circuit 4 to flow into the oil tank 8 to reduce the oil pressure of the hydraulic oil in the first oil circuit 4.

[0051] Here, the first preset threshold value can be 17 MPa, that is, when the oil pressure in the first oil circuit 4 monitored by the pressure measuring contact 502 is greater than 17 MPa, the overflow valve 503 opens, allowing the hydraulic oil in the first oil circuit 4 to flow into the oil tank 8, so as to reduce the oil pressure of the hydraulic oil in the first oil circuit 4, thereby avoiding damage to the hydraulic pump 1 or electric pump 3 connected to the first oil circuit 4 due to excessive oil pressure in the first oil circuit 4, thereby providing protection for the hydraulic pump 1 and the electric pump 3.

[0052] In some possible embodiments, an oil pressure sensor is provided on the accumulator 2, and the oil pressure sensor is used to detect the oil pressure of the hydraulic oil in the accumulator 2; a throttle valve 504 is provided between the reversing valve 501 and the accumulator 2; the throttle valve 504 is used to cut off the communication between the reversing valve 501 and the accumulator 2 when the oil pressure detected by the oil pressure sensor is greater than a second preset threshold value.

[0053] Since the volume of the hydraulic oil stored in the accumulator 2 is limited, in order to prevent the accumulator 2 from being damaged due to excessive oil pressure of the hydraulic oil, an oil pressure sensor is provided on the accumulator 2 to detect the oil pressure of the hydraulic oil in the accumulator 2, and then a throttle valve 504 is provided between the reversing valve 501 and the accumulator 2. When the oil pressure detected by the oil pressure sensor is greater than the second preset threshold value, the throttle valve 504 cuts off the communication between the reversing valve 501 and the accumulator 2 to prevent the hydraulic oil in the first oil circuit 4 from entering the accumulator 2, thereby avoiding damage caused by excessive oil pressure in the accumulator 2.

[0054] In some possible embodiments, a shuttle valve 9 is provided on the first oil circuit 4, and the electric pump 3 is connected to the shuttle valve 9 through the fourth oil circuit 10. The shuttle valve 9 is used to maintain communication between the oil outlet end of the hydraulic pump 1 and the steering valve group 5 when the hydraulic pump 1 is not faulty, and to cut off the communication between the fourth oil circuit 10 and the first oil circuit 4; the shuttle valve 9 is also used to cut off the communication between the oil outlet end of the hydraulic pump 1 and the steering valve group 5 when the hydraulic pump 1 fails, and to connect the fourth oil circuit 10 with the first oil circuit 4.

[0055] By arranging the shuttle valve 9 on the first oil circuit 4, not only can the switching of the connection or isolation between the hydraulic pump 1 and the electric pump 3 and the first oil circuit 4 be achieved, but it can also facilitate the connection of the electric pump 3 to the first oil circuit 4 through the fourth oil circuit 10, thereby simplifying the piping design of the entire steering system and facilitating the installation and maintenance of the electric pump 3 and the fourth oil circuit 10.

[0056] In some possible embodiments, a filter 11 is provided on the first oil circuit 4 , and the filter 11 is used to filter the hydraulic oil pumped to the steering valve group 5 through the first oil circuit 4 .

[0057] Here, the filter 11 may be provided between the shuttle valve 9 and the diverter valve group 5 .

[0058] By providing a filter 11 on the first oil circuit 4, impurities in the hydraulic oil in the oil tank 8 can be prevented from flowing into the pipeline of the steering system, thereby preventing the accumulator 2, the steering valve group 5 and the steering mechanism from being damaged by impurities in the hydraulic oil.

[0059] In some possible embodiments, the steering mechanism includes a steering gear 12 and a steering cylinder 13, the oil inlet end of the steering gear 12 is connected to the steering valve group 5 through the third oil circuit 7, and the oil outlet end of the steering gear 12 is connected to the steering cylinder 13 through the fifth oil circuit.

[0060] Here, the steering gear 12 may be connected to a steering wheel.

[0061] In this embodiment, by selecting the steering mechanism as the steering gear 12 and the steering cylinder 13, the hydraulic energy of the steering gear 12 and the steering cylinder 13 can be provided by the hydraulic pump 1, the electric pump 3 and the accumulator 2 to avoid pipeline redundancy.

[0062] An embodiment of the present invention provides a mining dump truck, which includes a hydraulic steering system as described in any of the above embodiments.

[0063] Since the mining dump truck of this embodiment includes any hydraulic steering system in the first aspect described above, it has the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0064] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0065] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0066] In the present invention, unless otherwise expressly specified or limited, when a first feature is “above” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0067] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A hydraulic steering system, applied to a mining dump truck, characterized in that: include: Steering mechanism, used to control the steering of mining dump trucks; a hydraulic pump, configured to pump the hydraulic oil in the oil tank to the oil inlet end of the steering mechanism through the first oil circuit; an accumulator, connected to the first oil circuit, for delivering the hydraulic oil stored therein to the oil inlet end of the steering mechanism through the first oil circuit when the hydraulic pump fails; An electric pump is connected to the first oil circuit and is used to pump the hydraulic oil in the oil tank to the oil inlet end of the steering mechanism through the first oil circuit after the switch of the electric pump is started.

2. The hydraulic steering system according to claim 1, characterized in that: A steering valve group is provided on the first oil circuit, the accumulator is connected to the steering valve group via a second oil circuit, and the steering mechanism is connected to the steering valve group via a third oil circuit; The steering valve group is used to allow the hydraulic oil in the first oil circuit to flow into the oil inlet end of the steering mechanism through the third oil circuit when the hydraulic pump is not faulty or when the switch with the electric pump is started; the steering valve group is also used to allow the hydraulic oil delivered by the accumulator in the second oil circuit to flow into the oil inlet end of the steering mechanism through the third oil circuit when the hydraulic pump fails.

3. The hydraulic steering system according to claim 2, characterized in that: The steering valve group is also used to allow part of the hydraulic oil in the first oil circuit to flow into the accumulator when the hydraulic pump or electric pump pumps the hydraulic oil in the oil tank to the oil inlet end of the steering mechanism through the first oil circuit.

4. The hydraulic steering system according to claim 3, characterized in that: The steering valve group includes: a reversing valve, wherein the first oil circuit, the second oil circuit, and the third oil circuit are all connected to the reversing valve; When the hydraulic pump does not fail or the switch of the electric pump is started, the reversing valve is used to connect the first oil circuit and the third oil circuit and cut off the connection between the second oil circuit and the third oil circuit; when the hydraulic pump fails and the switch of the electric pump is not started, the reversing valve is used to connect the second oil circuit and the third oil circuit and cut off the connection between the first oil circuit and the third oil circuit.

5. The hydraulic steering system according to claim 4, characterized in that: The steering valve group also includes: a pressure measuring contact, for monitoring the oil pressure in the first oil circuit; a relief valve connected in parallel with the reversing valve via a fourth oil circuit, and the relief valve is also connected to the oil tank; When the oil pressure monitored by the pressure measuring contact is greater than a first preset threshold, the relief valve is used to allow the hydraulic oil in the first oil circuit to flow into the oil tank to reduce the oil pressure of the hydraulic oil in the first oil circuit.

6. The hydraulic steering system according to claim 4, characterized in that: The accumulator is provided with an oil pressure sensor, which is used to detect the oil pressure of the hydraulic oil in the accumulator; a throttle valve is provided between the reversing valve and the accumulator; the throttle valve is used to cut off the communication between the reversing valve and the accumulator when the oil pressure detected by the oil pressure sensor is greater than a second preset threshold value.

7. The hydraulic steering system according to claim 2, characterized in that: A shuttle valve is provided on the first oil circuit, and the electric pump is connected to the shuttle valve via a fourth oil circuit. The shuttle valve is used to maintain communication between the oil outlet of the hydraulic pump and the steering valve group when the hydraulic pump is not faulty, and to cut off communication between the fourth oil circuit and the first oil circuit; the shuttle valve is also used to cut off communication between the oil outlet of the hydraulic pump and the steering valve group when the hydraulic pump fails, and to connect the fourth oil circuit with the first oil circuit.

8. The hydraulic steering system according to claim 2, characterized in that: A filter is provided on the first oil circuit, and the filter is used to filter the hydraulic oil pumped to the steering valve group through the first oil circuit.

9. The hydraulic steering system according to any one of claims 2 to 8, characterized in that: The steering mechanism includes a steering gear and a steering cylinder. The oil inlet end of the steering gear is connected to the steering valve group through a third oil circuit, and the oil outlet end of the steering gear is connected to the steering cylinder through a fifth oil circuit.

10. A mining dump truck, characterized in that: Comprising the hydraulic steering system according to any one of claims 1 to 9.

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