Emergency hydraulic steering system for engineering machinery and engineering machinery

Abstract

The utility model relates to an emergency hydraulic steering system for engineering machinery, which comprises a travel motor (1) and a driving pump (2), the driving pump is in fluid connection with two sides of the travel motor respectively through a first oil way (3) and a second oil way (4), the emergency hydraulic steering system is characterized by further comprising a shuttle valve (5) and a pressure reducing valve (6), two input ends of the shuttle valve are respectively in fluid connection with a first oil path and a second oil path, an output end of the shuttle valve is in fluid connection with an oil inlet of the pressure reducing valve, and an oil outlet of the pressure reducing valve is in fluid connection with a hydraulic steering system of the engineering machinery. The utility model further relates to engineering machinery comprising the emergency hydraulic steering system.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, and more specifically to an emergency hydraulic steering system for engineering machinery and an engineering machinery comprising the emergency hydraulic steering system. Background Art

[0002] Safety regulations in most regions require that construction machinery be equipped with an emergency steering (or auxiliary steering) system so that emergency steering operations can be performed when the main steering system of the construction machinery loses pressure energy, thereby improving the safety of the construction machinery.

[0003] The current common solutions in the industry mainly include adding an additional emergency steering pump to provide a steering pressure oil source in an emergency or adding a steering accumulator to store hydraulic energy for emergency use. Both solutions require additional high costs and generate additional energy losses when the construction machinery is working normally.

[0004] The utility model aims to solve at least one of the above problems and other problems in the prior art. Utility Model Content

[0005] According to one aspect of the utility model, an emergency hydraulic steering system for engineering machinery is provided, comprising a travel motor and a drive pump, wherein the drive pump is fluidically connected to both sides of the travel motor through a first oil circuit and a second oil circuit, wherein:

[0006] The emergency hydraulic steering system also includes a shuttle valve and a pressure reducing valve, wherein:

[0007] The two input ends of the shuttle valve are respectively connected to the first oil circuit and the second oil circuit fluid.

[0008] The output end of the shuttle valve is fluidly connected to the oil inlet of the pressure reducing valve.

[0009] The oil outlet of the pressure reducing valve is fluidically connected to the hydraulic steering system of the engineering machinery.

[0010] Advantageously, when the pressure of the hydraulic steering system of the engineering machinery is greater than or equal to a predetermined threshold value, the oil circuit between the oil outlet of the pressure reducing valve and the hydraulic steering system is disconnected; when the pressure of the hydraulic steering system of the engineering machinery is lower than the predetermined threshold value, the oil circuit between the oil outlet of the pressure reducing valve and the hydraulic steering system is connected.

[0011] Advantageously, the controller automatically controls the disconnection and connection of the oil circuit between the oil outlet of the pressure reducing valve and the hydraulic steering system based on the pressure of the hydraulic steering system of the construction machine.

[0012] Advantageously, a normally closed emergency steering switch connected to a controller signal is provided in the oil circuit between the oil outlet of the pressure reducing valve and the hydraulic steering system, and the emergency steering switch can be opened upon receiving an opening signal from the controller.

[0013] Advantageously, the controller is an ECM of the construction machine.

[0014] Advantageously, the shuttle valve and the pressure reducing valve are integrated into one valve block.

[0015] Advantageously, a first electrically controlled overflow valve and a first oil replenishing valve are arranged in parallel between the first oil circuit and the hydraulic oil tank, and a second electrically controlled overflow valve and a second oil replenishing valve are arranged in parallel between the second oil circuit and the hydraulic oil tank.

[0016] According to another aspect of the present utility model, a construction machine is provided, wherein the construction machine comprises the emergency hydraulic steering system according to the present utility model.

[0017] Advantageously, the engineering machine is a wheeled hydraulic traveling machine.

[0018] The emergency hydraulic steering system according to the utility model realizes emergency steering (or auxiliary steering) at a relatively low additional cost and avoids energy loss under normal working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be described in more detail below with reference to the schematic drawings. The drawings and corresponding embodiments are for illustrative purposes only and are not intended to limit the present invention. Among them:

[0020] Figure 1 The hydraulic principle diagram of an emergency hydraulic steering system for engineering machinery according to a preferred embodiment of the utility model is schematically shown.

[0021] List of reference numerals:

[0022] 1 Travel motor 2 Drive pump

[0023] 3 First oil circuit 4 Second oil circuit

[0024] 5 Shuttle valve 6 Pressure reducing valve

[0025] 7 Hydraulic oil tank 11 First electronically controlled overflow valve

[0026] 12 First oil replenishment valve 13 Second electronically controlled overflow valve

[0027] 14 Second oil supply valve 100 Emergency hydraulic steering system DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present invention. However, it is obvious to those skilled in the art that the implementation of the present invention may not have some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as elements or limitations of the claims unless clearly stated in the claims.

[0029] Figure 1 The hydraulic principle diagram of an emergency hydraulic steering system 100 for engineering machinery according to a preferred embodiment of the utility model is schematically shown. The emergency hydraulic steering system 100 is particularly suitable for wheeled hydraulic walking machinery. However, it should be understood that the same inventive principle can be applied to other engineering machinery or other types of machinery with similar working conditions.

[0030] like Figure 1 As shown, the emergency hydraulic steering system 100 includes a travel motor 1 , a drive pump 2 , a hydraulic oil tank 7 , a first electrically controlled overflow valve 11 , a first oil replenishment valve 12 , a second electrically controlled overflow valve 13 and a second oil replenishment valve 14 .

[0031] The driving pump 2 is fluidically connected to both sides of the travel motor 1 through the first oil circuit 3 and the second oil circuit 4. When the driving pump 2 supplies oil to the travel motor 1 via the first oil circuit 3, the travel motor 1 rotates in one direction to drive the engineering machine forward, and when the driving pump 2 supplies oil to the travel motor 1 via the second oil circuit 4, the travel motor 1 rotates in the opposite direction to drive the engineering machine backward. Or vice versa, that is, when the driving pump 2 supplies oil to the travel motor 1 via the first oil circuit 3, the travel motor 1 drives the engineering machine backward, and when the driving pump 2 supplies oil to the travel motor 1 via the second oil circuit 4, the travel motor 1 drives the engineering machine forward.

[0032] The first electrically controlled overflow valve 11 and the first oil replenishing valve 12 are arranged in parallel between the first oil circuit 3 and the hydraulic oil tank 7. The first electrically controlled overflow valve 11 is used to control the maximum pressure of the first oil circuit 3. The oil inlet of the first electrically controlled overflow valve 11 is fluidly connected to the first oil circuit 3, and the oil outlet of the first electrically controlled overflow valve 11 is fluidly connected to the hydraulic oil tank 7. The first oil replenishing valve 12 is constructed as a one-way valve, and the oil inlet of the first oil replenishing valve 12 is fluidly connected to the hydraulic oil tank 7, and the oil outlet of the first oil replenishing valve 12 is fluidly connected to the first oil circuit 3. When cavitation occurs on the side of the travel motor 1 that is fluidly connected to the first oil circuit 3, the first oil replenishing valve 12 can be used to replenish oil for the travel motor to prevent cavitation and cavitation.

[0033] The second electrically controlled relief valve 13 and the second oil replenishing valve 14 are arranged in parallel between the second oil circuit 4 and the hydraulic oil tank 7. The second electrically controlled relief valve 13 is used to control the maximum pressure of the second oil circuit 4. The oil inlet of the second electrically controlled relief valve 13 is fluidly connected to the second oil circuit 4, and the oil outlet of the second electrically controlled relief valve 13 is fluidly connected to the hydraulic oil tank 7. The second oil replenishing valve 14 is constructed as a one-way valve, the oil inlet of the second oil replenishing valve 14 is fluidly connected to the hydraulic oil tank 7, and the oil outlet of the second oil replenishing valve 14 is fluidly connected to the second oil circuit 4. When cavitation occurs on the side of the travel motor 1 that is fluidly connected to the second oil circuit 4, the second oil replenishing valve 14 can be used to replenish oil for the travel motor to prevent cavitation and cavitation.

[0034] According to the utility model, the emergency hydraulic steering system 100 also includes a shuttle valve 5 and a pressure reducing valve 6, wherein the two input ends of the shuttle valve 5 are respectively connected to the first oil circuit 3 and the second oil circuit 4 fluid, the output end of the shuttle valve 5 is connected to the oil inlet fluid of the pressure reducing valve 6, and the oil outlet of the pressure reducing valve 6 is connected to the hydraulic steering system fluid of the construction machinery.

[0035] Advantageously, when the pressure of the hydraulic steering system of the engineering machinery is greater than or equal to a predetermined threshold, the oil outlet of the pressure reducing valve 6 is disconnected from the oil circuit of the hydraulic steering system. When the pressure of the hydraulic steering system of the engineering machinery is lower than the predetermined threshold, the oil outlet of the pressure reducing valve 6 is connected to the oil circuit of the hydraulic steering system. Therefore, when the hydraulic steering system of the engineering machinery operates normally, the emergency hydraulic steering system 100 is fluidically disconnected from the hydraulic steering system of the engineering machinery, and there is no need to increase the additional energy consumption of the walking system. When the pressure of the hydraulic steering system of the engineering machinery is lower than the predetermined threshold, the hydraulic oil from the higher pressure of the first oil circuit 3 and the second oil circuit 4 can be delivered to the hydraulic steering system of the engineering machinery via the shuttle valve 5 and the pressure reducing valve 6, providing a pressure oil source for the steering system of the engineering machinery to complete the emergency steering operation.

[0036] Advantageously, the controller automatically controls the disconnection and connection of the oil circuit between the oil outlet of the pressure reducing valve 6 and the hydraulic steering system based on the pressure of the hydraulic steering system of the engineering machinery. For example, a normally closed emergency steering switch connected to the controller signal can be provided in the oil circuit between the oil outlet of the pressure reducing valve 6 and the hydraulic steering system, and the emergency steering switch can be opened upon receiving an opening signal from the controller. Therefore, when the engineering machinery loses the energy of the main steering system, the emergency steering switch can be automatically opened by the controller, and the pressure energy provided by the travel system can be used to complete the emergency steering operation.

[0037] The controller may be a host controller of the engineering machine. In one embodiment, the controller is, for example, an electronic control module (ECM) of the engineering machine.

[0038] Advantageously, the shuttle valve 5 and the pressure reducing valve 6 can be integrated into one valve block.

[0039] Industrial Applicability

[0040] The working principle of the emergency hydraulic steering system 100 according to the utility model is described in detail below. The emergency hydraulic steering system 100 is particularly suitable for wheeled hydraulic walking machinery. It is understandable that the emergency hydraulic steering system 100 is also suitable for other engineering machinery or other types of machinery with similar working conditions.

[0041] When the hydraulic steering system of the engineering machine operates normally, the emergency hydraulic steering system 100 is fluidically disconnected from the hydraulic steering system of the engineering machine, for example, by a normally closed emergency steering switch, and no additional energy consumption of the travel system is required. The driving pump 2 delivers hydraulic oil to the travel motor 1 to drive the engineering machine forward or backward.

[0042] When the construction machinery loses the energy of the main steering system, the controller can automatically open the emergency steering switch, and the hydraulic oil from the higher pressure of the first oil circuit 3 and the second oil circuit 4 can be delivered to the hydraulic steering system of the construction machinery through the shuttle valve 5 and the pressure reducing valve 6, thereby using the pressure energy provided by the travel system to complete the emergency steering operation. At this time, as long as the construction machinery has a driving speed, it can generate a continuous supply of hydraulic oil to supply the hydraulic steering system.

[0043] The emergency hydraulic steering system 100 according to the utility model realizes emergency steering (or auxiliary steering) at a relatively low additional cost and avoids energy loss under normal working conditions.

[0044] The emergency hydraulic steering system of the present invention is described above with the aid of specific embodiments. It is obvious to those skilled in the art that various changes and modifications may be made to the emergency hydraulic steering system of the present invention without departing from the design principles of the present invention. For example, the implementation of the present invention may not include some of the specific features described, and the present invention is not limited to the specific embodiments described, but rather any combination of the described features and elements may be envisioned. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed emergency hydraulic steering system. The specification and examples are to be regarded as exemplary only, with the true scope being represented by the appended claims and their equivalents.

Claims

1. An emergency hydraulic steering system for engineering machinery, comprising a travel motor (1) and a drive pump (2), wherein the drive pump is fluidically connected to both sides of the travel motor via a first oil circuit (3) and a second oil circuit (4), and characterized in that: The emergency hydraulic steering system further comprises a shuttle valve (5) and a pressure reducing valve (6), wherein: The two input ends of the shuttle valve are respectively connected to the first oil circuit and the second oil circuit fluid. The output end of the shuttle valve is fluidly connected to the oil inlet of the pressure reducing valve. The oil outlet of the pressure reducing valve is fluidically connected to the hydraulic steering system of the engineering machinery.

2. The emergency hydraulic steering system according to claim 1, characterized in that: When the pressure of the hydraulic steering system of the engineering machinery is greater than or equal to a predetermined threshold, the oil circuit between the oil outlet of the pressure reducing valve and the hydraulic steering system is disconnected; When the pressure of the hydraulic steering system of the engineering machinery is lower than the predetermined threshold, the oil outlet of the pressure reducing valve is communicated with the oil circuit between the hydraulic steering system.

3. The emergency hydraulic steering system according to claim 1 or 2, characterized in that: The controller automatically controls the disconnection and connection of the oil circuit between the oil outlet of the pressure reducing valve and the hydraulic steering system based on the pressure of the hydraulic steering system of the construction machinery.

4. The emergency hydraulic steering system according to claim 3, characterized in that: A normally closed emergency steering switch connected to the controller signal is arranged in the oil circuit between the oil outlet of the pressure reducing valve and the hydraulic steering system. The emergency steering switch can be opened upon receiving an opening signal from the controller.

5. The emergency hydraulic steering system according to claim 3, characterized in that: The controller is an electronic control module of the construction machinery.

6. The emergency hydraulic steering system according to claim 1 or 2, characterized in that: The shuttle valve and the pressure reducing valve are integrated in one valve block.

7. The emergency hydraulic steering system according to claim 1 or 2, characterized in that: A first electrically controlled overflow valve (11) and a first oil replenishment valve (12) are arranged in parallel between the first oil circuit and the hydraulic oil tank (7), and a second electrically controlled overflow valve (13) and a second oil replenishment valve (14) are arranged in parallel between the second oil circuit and the hydraulic oil tank.

8. An engineering machine, characterized in that: The construction machine comprises the emergency hydraulic steering system according to any one of claims 1 to 7.

9. The engineering machine according to claim 8, characterized in that: The engineering machinery is a wheeled hydraulic traveling machine.

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