Steering and lifting hydraulic system of mining dump truck

Abstract

A steering and lifting hydraulic system of a mining dump truck comprises a steering system and a lifting system, the steering system comprises a steering pump, a priority valve, a steering gear and a steering cylinder, the lifting system comprises a lifting pump, a lifting valve and a lifting cylinder, and the oil outlet end of the lifting pump is connected with a lifting handle; three oil inlet pipelines are arranged at the oil inlet end of the steering gear, one oil inlet pipeline is connected with the priority valve, the second oil inlet pipeline is connected with the lifting cylinder, and the third oil inlet pipeline is connected with the low-pressure emergency pump; and the controller is used for controlling the second oil inlet pipeline and the low-pressure emergency pump. According to the steering and lifting hydraulic system of the mining dump truck, on the basis of a priority valve steering system, an additional power source is provided, when the truck loses power, emergency steering pressure oil and emergency steering power are provided for the steering system through a lifting system, meanwhile, a low-pressure emergency pump is arranged, supplementary oil is provided, and the hydraulic system is used for supplying power to the mining dump truck. Stable operation of the system is guaranteed, the vehicle can normally steer and park, and the safety of a driver is guaranteed.

Description

Technical Field

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

[0002] Wide-body vehicles that use full hydraulic steering systems in the market mostly use priority valve steering systems. The advantages of this system are mature technology and high cost performance. The disadvantage is that it cannot provide emergency steering functions that meet the GB / T-14781-93 5-3 emergency steering system test. Considering the high failure rate of wide-body vehicles, open-pit mining areas are mostly winding mountain roads. The lack of this function poses a major risk to the driver's personal safety. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a steering and lifting hydraulic system for a mining dump truck with a simple structure and good effects.

[0004] The utility model is realized by the following technical scheme: a steering and lifting hydraulic system for a mining dump truck, comprising a steering system and a lifting system, wherein the steering system comprises a steering pump, wherein the steering pump is connected to a steering gear through a priority valve, wherein the steering gear is connected to a steering cylinder, wherein the lifting system comprises a lifting pump, wherein the lifting pump is connected to a lifting cylinder through a lifting valve, wherein an oil outlet end of the lifting pump is also connected to a lifting handle, wherein an oil outlet end of the lifting handle is connected to a control end of the lifting valve;

[0005] The oil inlet end of the steering gear is provided with three oil inlet pipelines, the hydraulic oil of one oil inlet pipeline is provided by a priority valve, the hydraulic oil of the second oil inlet pipeline is provided by the oil inlet end of the lifting cylinder, and the hydraulic oil of the third oil inlet pipeline is provided by a low-pressure emergency pump;

[0006] The utility model also comprises a controller, wherein the controller is connected to and controls the second oil inlet pipeline and the low-pressure emergency pump.

[0007] It is further provided with a two-position three-way hydraulically controlled reversing main valve core, one side of the main valve core is connected to a steering pump, and two ports on the other side of the main valve core are respectively connected to a steering gear and a lifting valve, and the main valve core is connected to a pressure oil port of the lifting valve.

[0008] The lifting valve is a three-position three-way hydraulically controlled reversing valve.

[0009] A limit valve is arranged between the lifting control end of the lifting cylinder of the lifting valve controller and the lifting handle.

[0010] The limit valve is a two-position three-way reversing valve.

[0011] An accumulator and an emergency steering control valve are provided between the oil inlet end of the lifting cylinder and the oil inlet end of the steering gear. The emergency steering control valve is a two-position two-way electromagnetic reversing valve.

[0012] A one-way valve I is provided between the accumulator and the oil inlet end of the lifting cylinder.

[0013] The emergency steering control valve is connected to the output end of the controller.

[0014] A one-way valve II is provided at the oil outlet of the low-pressure emergency pump.

[0015] The utility model has the following advantages: the steering and lifting hydraulic system of the mining dump truck of the utility model can provide an additional power source on the basis of the priority valve steering system. When the vehicle loses power, emergency steering pressure oil is provided to the steering system through the lifting system to provide emergency steering power. At the same time, a low-pressure emergency pump is provided to provide supplementary oil to ensure the stable operation of the system, so that the vehicle can be normally turned to the side of the road and parked, thereby ensuring the safety of the driver. At the same time, the emergency steering function of the GB / T-14781-93 5-3 emergency steering system test is met. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are part of this application and are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application, but do not constitute an improper limitation on this application. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] In the attached picture:

[0018] Figure 1 It is a hydraulic principle diagram of the utility model.

[0019] In the figure: 1. steering pump, 2. priority valve, 3. steering gear, 4. steering cylinder, 5. emergency steering control valve, 6. accumulator, 7. check valve I, 8. lifting cylinder, 9. limit valve, 10. lifting valve, 11. lifting handle, 12. lifting pump, 13. low-pressure emergency pump, 14. check valve II.

[0020] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present application in any way, but rather to illustrate the concepts of the present application for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but are not used to limit the scope of the present application.

[0022] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] like Figure 1 A steering and lifting hydraulic system for a mining dump truck shown in the figure includes a steering system and a lifting system, wherein the steering system includes a steering pump 1, wherein the steering pump 1 is connected to a steering gear 3 through a priority valve 2, wherein the steering gear 3 is connected to a steering cylinder 4, wherein the lifting system includes a lifting pump 12, wherein the lifting pump 12 is connected to a lifting cylinder 8 through a lifting valve 10, wherein the oil outlet end of the lifting pump 12 is also connected to a lifting handle 11, wherein the oil outlet end of the lifting handle 11 is connected to the control end of the lifting valve 10; wherein three oil inlet pipelines are provided at the oil inlet end of the steering gear 3, wherein the hydraulic oil of one oil inlet pipeline is provided by the priority valve 2, the hydraulic oil of the second oil inlet pipeline is provided by the oil inlet end of the lifting cylinder 8, and the hydraulic oil of the third oil inlet pipeline is provided by a low-pressure emergency pump 13; and further includes a controller, wherein the controller is connected to and controls the second oil inlet pipeline and the low-pressure emergency pump 13. The steering and lifting hydraulic system of a mining dump truck of the present application comprises a steering system and a lifting system, wherein the lifting system is connected to the steering system and provides emergency steering hydraulic oil therefor, and the steering system is also connected to a low-pressure emergency pump for supplying emergency steering hydraulic oil therefor, specifically, Figure 1As shown, the left part of the system is the steering function, including a steering pump, a priority valve, a steering gear and a steering cylinder. The steering pump supplies hydraulic oil to the steering cylinder through the priority valve and the steering gear. The right side is the lifting function, including components such as a lifting pump, a lifting valve, a lifting cylinder, a limit valve and a lifting handle. The lifting cylinder supplies hydraulic oil to the lifting cylinder through the lifting valve. The lifting cylinder also supplies oil to the lifting handle. The lifting handle provides control oil for the lifting valve. The lifting valve is connected to the input end of the steering gear while supplying hydraulic oil to the lifting cylinder. Under special circumstances, the lifting cylinder supplies hydraulic oil to the steering cylinder through the lifting valve and the steering gear to ensure the normal operation of the steering system. In addition, the input end of the steering gear is also connected to a low-pressure emergency pump, which can also realize the function of providing hydraulic oil to the steering cylinder under special circumstances. Among them, whether the steering gear is provided with emergency hydraulic oil by the lifting valve or the low-pressure emergency pump is determined by the controller.

[0025] like Figure 1 A steering and lifting hydraulic system for a mining dump truck is shown, wherein the priority valve 2 is provided with a two-position three-way hydraulically controlled reversing main valve core, one side of the main valve core is connected to the steering pump 1, and the two ports on the other side of the main valve core are respectively connected to the steering gear 3 and the lifting valve 10, and the main valve core is connected to the pressure oil port of the lifting valve 10. The priority valve of the present application is provided with two working positions, namely, the working position for supplying oil to the steering gear and the working position for supplying oil to the lifting valve. When the steering cylinder is steering, the priority valve supplies oil to the steering gear, and the steering pump outputs hydraulic oil to flow to the input end of the steering gear through the CF port of the priority valve. When the steering cylinder is not steering, when the priority valve supplies oil to the lifting valve, the steering pump outputs hydraulic oil to flow to the P1 end of the lifting valve through the EF port of the priority valve. When the lifting cylinder is not lifting, the oil at the P1 end and the oil at the P2 end return oil together. When the lifting cylinder is lifting, the oil at the P1 end and the oil at the P2 end simultaneously supply oil to the lifting cylinder for lifting action.

[0026] like Figure 1 The steering and lifting hydraulic system of a mining dump truck shown in the figure, the lifting valve 10 is a three-position three-way hydraulically controlled reversing valve. A limit valve 9 is arranged between the control end of the lifting cylinder 8 of the lifting valve 10 controller and the lifting handle 11. The limit valve 9 is a two-position three-way reversing valve.

[0027] like Figure 1A steering and lifting hydraulic system for a mining dump truck is shown, wherein an accumulator 6 and an emergency steering control valve 5 are provided between the oil inlet end of the lifting cylinder 8 and the oil inlet end of the steering gear 3, and the emergency steering control valve 5 is a two-position two-way electromagnetic reversing valve. A check valve I7 is provided between the accumulator 6 and the oil inlet end of the lifting cylinder 8. The emergency steering control valve 5 is connected to the output end of the controller. A check valve II14 is provided at the oil outlet end of the low-pressure emergency pump 13. The emergency steering part of the present application contains an emergency steering control valve, an accumulator, a check valve I, a low-pressure emergency pump and a check valve II. The emergency steering control valve, the accumulator and the check valve I constitute the first oil inlet pipeline. When a steering system fails, the controller opens the emergency steering control valve, and the accumulator provides emergency steering hydraulic oil to the steering gear. The low-pressure emergency pump and the check valve II constitute the third oil inlet pipeline. When the hydraulic oil of the accumulator is released, the controller controls the emergency steering control valve to close, and opens the low-pressure emergency pump to continue to provide emergency steering hydraulic oil to the steering gear to ensure the smooth operation of the steering system.

[0028] like Figure 1 The steering and lifting hydraulic system of a mining dump truck shown in the figure is divided into two situations when in use: a fault-free mode and a faulty mode, as follows:

[0029] Vehicle trouble-free driving

[0030] 1. When the steering is not made and the vehicle is not lifted, the pressure oil pumped out by the steering pump passes through the EF port of the priority valve and returns through the lifting valve.

[0031] 2. When lifting without steering, the lifting handle is moved to the lifting position, the pilot air source controls the lifting valve to the lifting position, the steering pump and the lifting pump supply oil to the lifting cylinder at the same time, and the accumulator is filled with oil during the lifting process.

[0032] 3. When steering, the pressure oil enters the steering gear through the CF port of the priority valve to drive the steering cylinder.

[0033] The vehicle is driving with a fault

[0034] After the vehicle loses power, the emergency steering control valve opens by receiving the electrical signal from the controller, and the accumulator supplies oil to the steering gear to provide emergency steering power. After the accumulator pressure oil is consumed, the emergency steering control valve closes at a fixed time, and at this time, a low-pressure emergency pump (with a low battery power supply) can be used to provide slow steering operation.

[0035] The steering and lifting hydraulic system of the mining dump truck of the present application can provide an additional power source when the whole machine loses power, and meets the emergency steering function of the GB / T-14781-93 5-3 emergency steering system test, so that the vehicle can be normally turned to the side of the road and parked to ensure the safety of the driver; at the same time, the vibration and noise generated by the impact of the multi-stage cylinder during lifting and falling are relatively large, and the accumulator can effectively alleviate the vibration and noise, thereby improving the safety and comfort of the whole vehicle.

[0036] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0037] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present application and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0038] The above is only a preferred embodiment of the present application and does not constitute any form of limitation to the present application. Although the present application has been disclosed as a preferred embodiment as above, it is not intended to limit the present application. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the solution of the present application.

Claims

1. A steering and lifting hydraulic system for a mining dump truck, characterized in that: The invention comprises a steering system and a lifting system, wherein the steering system comprises a steering pump (1), wherein the steering pump (1) is connected to a steering gear (3) via a priority valve (2), wherein the steering gear (3) is connected to a steering cylinder (4), wherein the lifting system comprises a lifting pump (12), wherein the lifting pump (12) is connected to a lifting cylinder (8) via a lifting valve (10), wherein an oil outlet end of the lifting pump (12) is also connected to a lifting handle (11), wherein an oil outlet end of the lifting handle (11) is connected to a control end of the lifting valve (10); The oil inlet end of the steering gear (3) is provided with three oil inlet pipelines, the hydraulic oil of one oil inlet pipeline is provided by a priority valve (2), the hydraulic oil of the second oil inlet pipeline is provided by the oil inlet end of the lifting cylinder (8), and the hydraulic oil of the third oil inlet pipeline is provided by a low-pressure emergency pump (13); It also includes a controller, which is connected to and controls the second oil inlet pipeline and the low-pressure emergency pump (13).

2. A steering and lifting hydraulic system for a mining dump truck as claimed in claim 1, characterized in that: The priority valve (2) is provided with a two-position three-way hydraulically controlled reversing main valve core, one side of the main valve core is connected to the steering pump (1), and two ports on the other side of the main valve core are respectively connected to the steering gear (3) and the lifting valve (10), and the main valve core is connected to the pressure oil port of the lifting valve (10).

3. A steering and lifting hydraulic system for a mining dump truck as claimed in claim 1, characterized in that: The lifting valve (10) is a three-position three-way hydraulically controlled reversing valve.

4. A steering and lifting hydraulic system for a mining dump truck as claimed in claim 3, characterized in that: A limit valve (9) is provided between the lifting control end of the lifting cylinder (8) of the lifting valve (10) controller and the lifting handle (11).

5. A steering and lifting hydraulic system for a mining dump truck as claimed in claim 4, characterized in that: The limit valve (9) is a two-position three-way reversing valve.

6. A steering and lifting hydraulic system for a mining dump truck as claimed in claim 1, characterized in that: An accumulator (6) and an emergency steering control valve (5) are provided between the oil inlet end of the lifting cylinder (8) and the oil inlet end of the steering gear (3); the emergency steering control valve (5) is a two-position, two-way electromagnetic reversing valve.

7. A steering and lifting hydraulic system for a mining dump truck as claimed in claim 6, characterized in that: A one-way valve I (7) is provided between the accumulator (6) and the oil inlet end of the lifting cylinder (8).

8. A steering and lifting hydraulic system for a mining dump truck as claimed in claim 6, characterized in that: The emergency steering control valve (5) is connected to the output end of the controller.

9. A steering and lifting hydraulic system for a mining dump truck as claimed in claim 1, characterized in that: A one-way valve II (14) is provided at the oil outlet of the low-pressure emergency pump (13).

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