Hydraulic steering system and engineering machinery

Abstract

The utility model relates to the technical field of engineering machinery, and provides a hydraulic steering system and engineering machinery, the hydraulic steering system comprises an oil tank, a steering pump, an emergency pump, a one-way valve block, a hydraulic steering gear and a steering oil cylinder, the steering pump, the emergency pump, the one-way valve block, the hydraulic steering gear and the steering oil cylinder are respectively connected with the oil tank, and the steering pump and the emergency pump are respectively connected with the one-way valve block. The one-way valve block, the hydraulic steering gear and the steering oil cylinder are sequentially connected, the hydraulic steering gear is used for being connected with a steering wheel of the engineering machine, and the steering oil cylinder is used for being in driving connection with wheels of the engineering machine. And the reliability of the hydraulic steering system of the engineering machinery is improved, and meanwhile, the driving safety and stability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a hydraulic steering system and engineering machinery. Background Art

[0002] Engineering machinery, such as wide-body mining vehicles, often travel in harsh environments such as mines and gravel. At the same time, due to their large bodies and high-power operating parts, hydraulics are usually used for driving operations. In order to meet the steering driving force and facilitate control, hydraulic steering is generally used, that is, the wheels are driven by hydraulics.

[0003] However, in the prior art, the hydraulic steering system of the engineering machinery is unstable and unreliable, and there may be a problem of hydraulic drive failure, which may cause safety problems in the driving of the engineering machinery and pose a safety hazard to the driver. Utility Model Content

[0004] The technical problem to be solved by the utility model is: how to improve the safety and reliability of the hydraulic steering system of engineering machinery.

[0005] The utility model provides a hydraulic steering system, comprising an oil tank and a steering pump, an emergency pump, a one-way valve block, a hydraulic steering gear, and a steering cylinder respectively connected to the oil tank, the steering pump and the emergency pump are respectively connected to the one-way valve block, the one-way valve block, the hydraulic steering gear, and the steering cylinder are connected in sequence, the hydraulic steering gear is used to be connected to the steering wheel of an engineering machinery, and the steering cylinder is used to be connected to the wheel drive of the engineering machinery.

[0006] Optionally, a first one-way valve and a second one-way valve are provided in the one-way valve block, the first one-way valve is connected to the steering pump, and the second one-way valve is connected to the emergency pump.

[0007] Optionally, the one-way valve block is provided with a first test joint, a second test joint and a third test joint, the first test joint is connected to the oil inlet end of the first one-way valve, the second test joint is connected to the oil inlet end of the second one-way valve, and the third test joint is connected to the oil outlet ends of the first one-way valve and the second one-way valve.

[0008] Optionally, a first overflow valve is further provided in the one-way valve block, an oil inlet end of the first overflow valve is connected to the oil outlet ends of the first one-way valve and the second one-way valve, and an oil outlet end of the first overflow valve is connected to the oil tank.

[0009] Optionally, the steering pump is used to be connected to a high-voltage power supply of the engineering machinery, and the emergency pump is used to be connected to a low-voltage DC power supply of the engineering machinery.

[0010] Optionally, the hydraulic steering system further includes an electric steering column, which is used to be arranged on the steering wheel and is connected to the hydraulic steering gear.

[0011] Optionally, the hydraulic steering system further includes a displacement sensor, which is disposed on the steering cylinder and is used to obtain a telescopic distance of the steering cylinder.

[0012] Optionally, the hydraulic steering system further includes a diverter block, which is connected to the hydraulic steering gear. There are two steering cylinders, and the diverter block is respectively connected to the two steering cylinders.

[0013] Optionally, the hydraulic steering system also includes a priority valve block connected between the one-way valve block and the hydraulic steering gear, a reversing valve is arranged in the priority valve block, and a first working oil port, a second working oil port and a first control oil port respectively connected to the reversing valve are arranged on the priority valve block, and the first working oil port and the first control oil port are respectively connected to the hydraulic steering gear, and the second working oil port is connected to the oil tank.

[0014] Compared with the prior art, the hydraulic steering system provided by the utility model has the following technical effects:

[0015] The hydraulic steering system provided by the utility model can be used for steering during the driving process of engineering machinery. By setting a steering pump connected to the oil tank, the steering pump can draw hydraulic oil from the oil tank and transmit power to the one-way valve block. At the same time, by connecting the hydraulic steering gear to the steering wheel of the engineering machinery, the hydraulic steering gear can receive and transmit steering instructions given by the steering wheel. For example, when the steering wheel is turned to turn left or right, the hydraulic steering gear will make corresponding instruction actions, and is connected to the hydraulic steering gear through the one-way valve block. The hydraulic steering gear is also connected to the steering cylinder connected to the wheel drive. The power hydraulic oil will drive the steering cylinder to perform telescopic actions, and then drive the wheels to perform corresponding steering actions. , and, by setting an emergency pump, and connecting the emergency pump and the steering pump between the oil tank and the one-way valve block respectively, if the steering pump or the pipelines, circuits, etc. connected to the steering pump fail, the emergency pump can be started as a backup power component, and the above-mentioned steering action can also be achieved, which is safe and reliable, and the one-way valve block can prevent the hydraulic oil of the high-pressure power from rushing back to the steering pump and the emergency pump, that is, when the steering pump is working, the one-way valve block can prevent the hydraulic oil from rushing to the non-working emergency pump, and when the emergency pump is working, the one-way valve block can prevent the hydraulic oil from rushing to the non-working steering pump, thereby preventing the steering pump and the emergency pump from being damaged by the high-pressure hydraulic oil, and ensuring the stability and safety of the operation. Through the above-mentioned structural setting, the emergency pump can be used as a backup power component of the steering pump, which improves the reliability of the hydraulic steering system of the engineering machinery, and at the same time, improves the safety and stability of driving.

[0016] In addition, the utility model also provides an engineering machinery, comprising the above-mentioned hydraulic steering system.

[0017] Compared with the prior art, the engineering machinery provided by the utility model has substantially the same technical effect as the above-mentioned hydraulic steering system by setting the above-mentioned hydraulic steering system, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the composition of the hydraulic steering system of an embodiment of the utility model.

[0019] Description of reference numerals:

[0020] 10- oil tank, 20- steering pump, 30- emergency pump, 40- one-way valve block, 41- first one-way valve, 42- second one-way valve, 43- first test joint, 44- second test joint, 45- third test joint, 46- first overflow valve, P1- first oil inlet, P2- second oil inlet, P3- first oil outlet, T1- first oil return port, 50- hydraulic steering gear, P5- fourth oil inlet, T3- third oil return port, LS2- second control oil port, A- third working oil port, B- fourth working oil port, 60- diverter block, 70- priority valve block, 71- reversing valve, 72- second overflow valve, P4- third oil inlet, T2- second oil return port, CF- first working oil port, EF- second working oil port, LS1- first control oil port, 81- left steering cylinder, 82- right steering cylinder. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0023] In the description of the present invention, the directions or positional relationships indicated by “upper”, “lower”, “left”, “right”, “top”, “bottom”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment" and "one implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0026] To solve the above technical problems, Figure 1 As shown, an embodiment of the utility model provides a hydraulic steering system, including an oil tank 10 and a steering pump 20, an emergency pump 30, a one-way valve block 40, a hydraulic steering gear 50, and a steering cylinder respectively connected to the oil tank 10, the steering pump 20 and the emergency pump 30 are respectively connected to the one-way valve block 40, the one-way valve block 40, the hydraulic steering gear 50 and the steering cylinder are connected in sequence, the hydraulic steering gear 50 is used to be connected to the steering wheel of the engineering machinery, and the steering cylinder is used to be connected to the wheel drive of the engineering machinery.

[0027] It should be noted that the engineering machinery may be a vehicle such as a wide-body mining vehicle, which has a relatively large body and a large operating component, and is usually driven by hydraulics. Its wheels, such as the left and right wheels of the front wheels, are respectively connected to a steering cylinder, and the two steering cylinders simultaneously drive the two front wheels to steer. Also, the steering pump 20 and the emergency pump 30 are respectively equipped with motors for power drive, and the low-pressure chamber of the steering pump 20 and the low-pressure chamber of the emergency pump 30 are respectively connected to the oil tank, and the high-pressure chamber of the steering pump 20 and the high-pressure chamber of the emergency pump 30 are respectively connected to the one-way valve block 40, and the two are connected in parallel and are redundant to each other. Of course, it is possible to identify whether the steering pump 20 or the pipelines, circuits and other components connected to the steering pump 20 have failed through manual observation or automatic detection by the host computer. If a failure occurs, the emergency pump 30 can be started by manual operation by personnel or automatic control by the host computer. At the same time, the one-way valve block 40 has a first oil inlet P1 and a second oil inlet P2 respectively connected to the steering pump 20 and the emergency pump 30, and is provided with a first oil outlet P3 for output and connected to the hydraulic steering gear 50, and a first oil return port T1 for returning oil and connected to the oil tank 10, and the hydraulic steering gear 50 can be connected to the steering column of the steering wheel, and the corresponding action instructions are given to the hydraulic steering gear 50 by turning the steering wheel, and the hydraulic steering gear 50 is provided with a fourth oil inlet P5 connected to the first oil outlet P3, a third oil return port T3 connected to the oil tank for returning oil, and at least two third working oil ports A and fourth working oil ports B for steering operations.

[0028] For example, taking the case where steering cylinders are respectively arranged on the two front wheels of the engineering machinery, as Figure 1 As shown, they are the left steering cylinder 81 and the right steering cylinder 82 respectively. The steering pump 20 starts working, and the high-pressure power hydraulic oil flows into the one-way valve block 40 from the first oil inlet P1 of the one-way valve block 40, and flows out from the first oil outlet P3, and then flows into the hydraulic steering gear 50 through the fourth oil inlet P5. At this time, if an action command to turn the steering wheel to the left is received, or a left turn command signal is received, the hydraulic steering gear 50 is actuated, and the high-pressure power hydraulic oil can flow out from the third working oil port A. The third working oil port A is respectively connected to the rodless cavity of the left steering cylinder 81 and the rod cavity of the right steering cylinder 82, driving the left steering cylinder 81 to extend and the right steering cylinder 82 to retract, thereby driving the two front wheels to turn left. Of course, it should be noted here that if Figure 1 As shown, the left steering cylinder 81 and the right steering cylinder 82 are symmetrically arranged, and then when the left steering cylinder 81 and the right steering cylinder 82 are turning left or right, the directions of their simultaneous extension or retraction movements are opposite, that is, for example, when the engineering machine turns left, the left steering cylinder 81 extends and the right steering cylinder 82 retracts; when the engineering machine turns right, the left steering cylinder 81 retracts and the right steering cylinder 82 extends, and it should be understood that, Figure 1The figure shown is only a schematic diagram of the composition and working principle of the hydraulic steering system. The specific connection method between the rod chamber and the rodless chamber of the steering cylinder and the hydraulic steering gear 50 needs to be determined according to the connection method and position of the steering cylinder and the wheel. Similarly, as mentioned above, when the hydraulic steering gear 50 receives a right turn command, the high-pressure power hydraulic oil can flow out from the fourth working oil port B, and the fourth working oil port B is respectively connected to the rod chamber of the left steering cylinder 81 and the rodless chamber of the right steering cylinder 82, driving the left steering cylinder 81 to retract and the right steering cylinder 82 to extend, thereby driving the two front wheels to turn right. In addition, the working principle of the emergency pump 30 when starting is roughly the same as the working principle of the steering pump 20 when it is working, which will not be repeated here.

[0029] In the present embodiment, the hydraulic steering system provided in the present embodiment can be used for steering during the driving process of engineering machinery. By setting a steering pump 20 connected to the oil tank 10, the steering pump 20 can draw hydraulic oil from the oil tank 10 and transmit power to the one-way valve block 40. At the same time, by connecting the hydraulic steering gear 50 to the steering wheel of the engineering machinery, the hydraulic steering gear 50 can receive and transmit the steering instructions given by the steering wheel. For example, when the steering wheel is turned to turn left or right, the hydraulic steering gear 50 will make corresponding instruction actions, and is connected to the hydraulic steering gear 50 through the one-way valve block 40. The hydraulic steering gear 50 is connected to the steering cylinder connected to the wheel drive. The power hydraulic oil will drive the steering cylinder to perform telescopic actions, thereby driving the wheels to perform corresponding steering actions, and through By setting up the emergency pump 30, and connecting the emergency pump 30 and the steering pump 20 between the oil tank 10 and the one-way valve block 40 respectively, when the steering pump 20 or the pipeline, circuit, etc. connected to the steering pump 20 fails, the emergency pump 30 can be started as a backup power component, and the above-mentioned steering action can also be achieved, which is safe and reliable. In addition, the one-way valve block 40 can prevent the hydraulic oil of the high-pressure power from rushing back to the steering pump 20 and the emergency pump 30, that is, when the steering pump 20 is working, the one-way valve block 40 can prevent the hydraulic oil from rushing to the inoperative emergency pump 30, and when the emergency pump 30 is working, the one-way valve block 40 can prevent the hydraulic oil from rushing to the inoperative steering pump 20, thereby preventing the steering pump 20 and the emergency pump 30 from being damaged by the high-pressure hydraulic oil, thereby ensuring the stability and safety of the operation. Through the above-mentioned structural setting, the emergency pump 30 can be used as a backup power component of the steering pump 20, thereby improving the reliability of the hydraulic steering system of the engineering machinery, and at the same time, improving the safety and stability of driving.

[0030] Alternatively, if Figure 1 As shown, a first one-way valve 41 and a second one-way valve 42 are disposed in the one-way valve block 40 . The first one-way valve 41 is connected to the steering pump 20 , and the second one-way valve 42 is connected to the emergency pump 30 .

[0031] Specifically, the oil inlet end of the first one-way valve 41 is connected to the first oil inlet port P1, the oil inlet end of the second one-way valve 42 is connected to the second oil inlet port P2, and the oil outlet ends of the first one-way valve 41 and the second one-way valve 42 are connected to the first oil outlet port P3 after being connected, and the structure is reasonable, compact and stable.

[0032] In this embodiment, by arranging the first one-way valve 41 and the second one-way valve 42 in the one-way valve block 40 and connecting them to the steering pump 20 and the emergency pump 30 respectively, the first one-way valve 41 and the second one-way valve 42 can respectively prevent the high-pressure oil from rushing back to the steering pump 20 and the emergency pump 30, thereby ensuring the safety of the steering pump 20 and the emergency pump 30, and further improving the safety and reliability of the overall system.

[0033] Alternatively, if Figure 1 As shown, the one-way valve block 40 is provided with a first test joint 43, a second test joint 44 and a third test joint 45, the first test joint 43 is connected to the oil inlet end of the first one-way valve 41, the second test joint 44 is connected to the oil inlet end of the second one-way valve 42, and the third test joint 45 is connected to the oil outlet ends of the first one-way valve 41 and the second one-way valve 42.

[0034] Specifically, the first test joint 43, the second test joint 44 and the third test joint 45 are all arranged on the surface of the one-way valve block 40, and are respectively connected to the pipeline between the first one-way valve 41 and the first oil inlet P1, the pipeline between the second one-way valve 42 and the second oil inlet P2, and the pipeline after the first one-way valve 41 and the second one-way valve 42 are connected through the pipeline in the one-way valve block 40.

[0035] In this embodiment, by providing a first test joint 43, a second test joint 44 and a third test joint 45 on the one-way valve block 40, and by connecting the first test joint 43 to the oil inlet end of the first one-way valve 41, the second test joint 44 to the oil inlet end of the second one-way valve 42, and the third test joint 45 to the oil outlet ends of the first one-way valve 41 and the second one-way valve 42, the first test joint 43, the second test joint 44 and the third test joint 45 can be respectively connected to a pressure gauge for testing, for example, to facilitate the detection of the oil inlet pressure of the first one-way valve 41 and the second one-way valve 42 and the oil outlet pressure of the first one-way valve 41 and the second one-way valve 42, thereby ensuring that the system can operate stably and further improving the safety of use.

[0036] Alternatively, if Figure 1 As shown, a first overflow valve 46 is also provided in the one-way valve block 40 , and the oil inlet end of the first overflow valve 46 is connected to the oil outlet ends of the first one-way valve 41 and the second one-way valve 42 , and the oil outlet end of the first overflow valve 46 is connected to the oil tank 10 .

[0037] Specifically, the oil inlet end of the first overflow valve 46 is connected to the pipeline after the first one-way valve 41 and the second one-way valve 42 are connected through a pipeline, and the oil outlet end of the first overflow valve 46, that is, the overflow end, is connected to the first oil return port T2 through a pipeline, and then connected to the oil tank 10 through a pipeline to ensure safety and reliability during use.

[0038] In this embodiment, by setting a first overflow valve 46 in the one-way valve block 40 and connecting it between the oil outlet ends of the first one-way valve 41 and the second one-way valve 42 and the oil tank 10, the entire hydraulic steering system is protected to prevent the system from having excessive pressure, which may lead to danger and malfunction, thereby further improving the overall safety and reliability.

[0039] Alternatively, if Figure 1 As shown, the steering pump 20 is used to be connected to the high voltage power supply of the engineering machinery, and the emergency pump 30 is used to be connected to the low voltage DC power supply of the engineering machinery.

[0040] Specifically, the motor of the steering pump 20 is connected to a high-voltage 380-volt AC power supply of engineering machinery, such as a wide-body mining vehicle, and the motor of the emergency pump 30 is connected to a low-voltage DC power supply of engineering machinery, such as a configured battery, which further improves the redundancy and reliability of use between the steering pump 20 and the emergency pump 30.

[0041] In this embodiment, the steering pump 20 is connected to the high-voltage power supply of the engineering machinery to ensure the overall operating power demand, and the emergency pump 30 is connected to the low-voltage DC power supply of the engineering machinery, such as a battery, to ensure the redundancy between the steering pump 20 and the emergency pump 30. That is, if the overall circuit of the engineering machinery fails, that is, the steering pump 20 loses power, the emergency pump 30 can also be powered by the low-voltage DC power supply of the engineering machinery, such as a battery, and the emergency pump 30 can be driven to work instead of the steering pump 20, so as to ensure that the hydraulic steering system of the engineering machinery can operate normally, thereby further improving the safety and reliability of the hydraulic steering system of the engineering machinery.

[0042] Alternatively, if Figure 1 As shown, the hydraulic steering system further includes an electric steering column, which is used to be arranged on the steering wheel and is connected to the hydraulic steering gear 50 .

[0043] Specifically, the electric steering column can be connected to the column of the steering wheel of the engineering machinery, that is, when the electric steering column is working, it can drive the steering wheel column to rotate, and when the electric steering column is not working, it can rotate along with the steering wheel column. In other words, the electric steering column can be connected to the upper computer of the engineering machinery, and the upper computer can regulate the movement of the electric steering column to realize automatic control of steering.

[0044] In this embodiment, an electric steering column is provided at the steering wheel and connected to the hydraulic steering gear 50. The electric steering column can be electrically controlled, for example, connected to a host computer of the construction machinery to achieve automatic control, and can be applied to an unmanned driving system. That is, the hydraulic steering system can be used together with the unmanned driving system through the electric steering column to achieve unmanned automatic steering of the construction machinery, thereby replacing manual driving operations and further ensuring the operating safety of personnel.

[0045] Alternatively, if Figure 1 As shown, the hydraulic steering system further includes a displacement sensor, which is disposed on the steering cylinder and is used to obtain the telescopic distance of the steering cylinder.

[0046] Specifically, two displacement sensors may be provided, such as Figure 1 As shown, they can be respectively arranged on the left steering cylinder 81 and the right steering cylinder 82, and are respectively used to obtain the telescopic distances of the left steering cylinder 81 and the right steering cylinder 82. Of course, the number and setting positions of the displacement sensors can be determined according to the number and installation positions of the steering cylinders, and are not specifically limited here.

[0047] In this embodiment, a displacement sensor is provided on the steering cylinder, which can detect and obtain the extension and retraction distance of the steering cylinder, and can correspond the displacement information to the steering angle information of the wheel. In addition, the displacement sensor can be connected to the host computer of the engineering machinery to provide the host computer with reliable and real-time wheel angle information for real-time and reliable automatic steering adjustment, making the steering more accurate and reliable.

[0048] Alternatively, if Figure 1 As shown, the hydraulic steering system further includes a diverter block 60, and the diverter block 60 is connected to the hydraulic steering gear 50. There are two steering cylinders, and the diverter block 60 is respectively connected to the two steering cylinders.

[0049] Specifically, for example Figure 1 As shown, the pipeline arranged in the diverter block 60 can connect the rodless chamber of the left steering cylinder 81 and the rod chamber of the right steering cylinder 82 and connect them with the third working oil port A of the hydraulic steering gear 50, and connect the rod chamber of the left steering cylinder 81 and the rodless chamber of the right steering cylinder 82 and connect them with the fourth working oil port B of the hydraulic steering gear 50. When the hydraulic steering gear 50 receives a left turn instruction, for example, the third working oil port A serves as a working output port, which can allow oil to flow into the rodless chamber of the left steering cylinder 81 and at the same time allow oil to flow into the rod chamber of the right steering cylinder 82. At the same time, the rod chamber of the left steering cylinder 81 and the rodless chamber of the right steering cylinder 82 discharge oil, that is, return oil to the oil tank through the fourth working oil port B of the hydraulic steering gear 50, and vice versa, so that the telescopic action of the left steering cylinder 81 and the right steering cylinder 82 is smoother and more stable.

[0050] In this embodiment, by connecting a diverter block between the hydraulic steering gear 50 and the steering cylinder, on the one hand, the structural stability and high degree of integration of the pipeline connection are ensured, which is neater and more reliable. On the other hand, when connecting two or more steering cylinders, reasonable diversion and confluence can be performed through the diverter block 60, thereby improving the operating accuracy and stability of the overall system.

[0051] Alternatively, if Figure 1 As shown, the hydraulic steering system also includes a priority valve block 70 connected between the one-way valve block 40 and the hydraulic steering gear 50, a reversing valve 71 is arranged in the priority valve block 70, and a first working oil port CF, a second working oil port EF and a first control oil port LS1 respectively connected to the reversing valve 71 are arranged on the priority valve block 70, and the first working oil port CF and the first control oil port LS1 are respectively connected to the hydraulic steering gear 50, and the second working oil port EF is connected to the oil tank 10.

[0052] Specifically, the hydraulic steering gear 50 is provided with a second control oil port LS2, which is connected to the first control oil port LS1 of the priority valve block 70, the first working oil port CF is connected to the fourth oil inlet P5 of the hydraulic steering gear 50, the priority valve block 70 is also provided with a third oil inlet P4 and a second oil return port T2, the third oil inlet P4 is connected to the first oil outlet P3 of the one-way valve block 40, the second oil return port T2 is connected to the oil tank 10, and a second overflow valve 72 is also provided in the priority valve block 70, the oil inlet end of the second overflow valve 72 is connected to the reversing valve 71, and the oil outlet end of the second overflow valve 72 is connected to the second oil return port T2, so as to prevent excessive pressure in the system and further protect the system.

[0053] In this embodiment, a priority valve block 70 is connected between the one-way valve block 40 and the hydraulic steering gear 50, and a reversing valve 71 is arranged in the priority valve block 70, and a first working oil port CF, a second working oil port EF and a first control oil port LS1 respectively connected to the reversing valve 71 are arranged on the priority valve block 70, and are correspondingly connected to the hydraulic steering gear 50. When in use, a control signal can be output to the first control oil port LS1 through the hydraulic steering gear 50, and then a reversing signal of the reversing valve 71 can be sent to the hydraulic box 50 and the steering oil through the first working oil port CF. The cylinder provides high-pressure power hydraulic oil for steering. If the hydraulic steering gear 50 has no steering signal, pressure may be built up at the oil inlet of the hydraulic steering gear 50, that is, the fourth oil inlet P5. At this time, the reversing valve 71 can be used to reverse the high-pressure power hydraulic oil to the second working oil port EF, and it can flow back to the oil tank 10. The second working oil port EF can be connected to other hydraulic working components or systems to supply oil to other hydraulic working components or systems. While ensuring the safety of the hydraulic steering system, it fully utilizes the hydraulic power energy, prevents energy waste, and makes reasonable use of energy.

[0054] In addition, another embodiment of the present invention provides an engineering machine, comprising the hydraulic steering system as described above.

[0055] Exemplarily, the engineering machinery is a wide-body mining vehicle.

[0056] In this embodiment, the engineering machinery described in this embodiment is provided with the above-mentioned hydraulic steering system, and the technical effect thereof is substantially the same as the technical effect of the above-mentioned hydraulic steering system, which will not be described in detail here.

[0057] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A hydraulic steering system, characterized in that: The invention comprises an oil tank (10), a steering pump (20), an emergency pump (30), a one-way valve block (40), a hydraulic steering gear (50), and a steering cylinder respectively connected to the oil tank (10); the steering pump (20) and the emergency pump (30) are respectively connected to the one-way valve block (40); the one-way valve block (40), the hydraulic steering gear (50), and the steering cylinder are connected in sequence; the hydraulic steering gear (50) is used to be connected to the steering wheel of the engineering machinery; and the steering cylinder is used to be connected to the wheel drive of the engineering machinery; a first one-way valve (41) and a second one-way valve (42) are arranged in the one-way valve block (40); the first one-way valve (41) is connected to the steering pump (20), and the second one-way valve (42) is connected to the emergency pump (30).

2. The hydraulic steering system according to claim 1, characterized in that: The one-way valve block (40) is provided with a first test joint (43), a second test joint (44) and a third test joint (45); the first test joint (43) is connected to the oil inlet end of the first one-way valve (41); the second test joint (44) is connected to the oil inlet end of the second one-way valve (42); and the third test joint (45) is connected to the oil outlet ends of the first one-way valve (41) and the second one-way valve (42).

3. The hydraulic steering system according to claim 2, characterized in that: A first overflow valve (46) is also provided in the one-way valve block (40); an oil inlet end of the first overflow valve (46) is connected to oil outlet ends of the first one-way valve (41) and the second one-way valve (42); and an oil outlet end of the first overflow valve (46) is connected to the oil tank (10).

4. The hydraulic steering system according to claim 1, characterized in that: The steering pump (20) is used to be connected to a high-voltage power supply of the engineering machinery, and the emergency pump (30) is used to be connected to a low-voltage direct current power supply of the engineering machinery.

5. The hydraulic steering system according to claim 1, characterized in that: The hydraulic steering system further comprises an electric steering column, which is used to be arranged on the steering wheel and is connected to the hydraulic steering gear (50).

6. The hydraulic steering system according to claim 5, characterized in that: The hydraulic steering system further comprises a displacement sensor, which is arranged on the steering cylinder and is used to obtain the telescopic distance of the steering cylinder.

7. The hydraulic steering system according to claim 1, characterized in that: The hydraulic steering system further comprises a diverter block (60), the diverter block (60) being connected to the hydraulic steering gear (50), the number of the steering cylinders being two, and the diverter block (60) being respectively connected to the two steering cylinders.

8. The hydraulic steering system according to claim 1, characterized in that: The hydraulic steering system further comprises a priority valve block (70) connected between the one-way valve block (40) and the hydraulic steering gear (50), a reversing valve (71) being arranged in the priority valve block (70), a first working oil port (CF), a second working oil port (EF) and a first control oil port (LS1) being arranged on the priority valve block (70) and being respectively connected to the reversing valve (71), the first working oil port (CF) and the first control oil port (LS1) being respectively connected to the hydraulic steering gear (50), and the second working oil port (EF) being connected to the oil tank (10).

9. An engineering machine, characterized in that: Comprising a hydraulic steering system as claimed in any one of claims 1-8.

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