Loader hydraulic system suitable for emergency steering

Abstract

The utility model discloses a loader hydraulic system suitable for emergency steering, which belongs to the technical field of loaders and comprises a steering oil cylinder, the steering oil cylinder is connected with a steering gear, and the steering gear is connected with a priority valve. One end of the priority valve is connected with the movable arm multi-way valve, and the movable arm multi-way valve is connected with the movable arm oil cylinder; an electromagnetic valve and a movable arm damping valve are arranged at one end of the movable arm multi-way valve, one end of the electromagnetic valve is connected with a pipeline for connecting the steering gear and the priority valve, and the other end of the electromagnetic valve is connected with the movable arm damping valve; one end of the movable arm damping valve is connected with the energy accumulator, and the other end of the movable arm damping valve is connected with a pipeline connecting the movable arm multi-way valve and the movable arm oil cylinder. According to the invention, the steering of the vehicle can be realized when the engine breaks down, so that the vehicle can be steered in time in case of emergency, and dangers are avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of loader, specifically relates to a loader hydraulic system suitable for emergency steering. BACKGROUND

[0002] The statements in this section merely provide background information related to the utility model and do not necessarily constitute prior art.

[0003] The loader is a kind of earthwork construction machinery widely used in highway, railway, building, water and electricity, port, mine and other construction projects, it is mainly used for shoveling soil, sand, lime, coal and other bulk materials, and can also be used for light shovel operation to ore, hard soil and the like.

[0004] The loader is controlled by steering gear to realize steering, and the oil inlet of steering gear is provided by pump driven by engine, when vehicle fails, engine cannot be started, and vehicle cannot realize steering, once vehicle is off and other emergency situations occur during construction, since vehicle cannot be steered in emergency, unnecessary danger can be caused. UTILITY MODEL CONTENTS

[0005] In view of the above problems, the utility model provides a loader hydraulic system suitable for emergency steering, which can realize the steering of vehicle when engine fails, and then can steer in time when vehicle encounters emergency, to avoid danger.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] A loader hydraulic system suitable for emergency steering, comprising steering cylinder, the steering cylinder is connected with steering gear, the steering gear is connected with priority valve;One end of the priority valve is connected with boom multi-way valve, the boom multi-way valve is connected with boom cylinder;

[0008] One end of the boom multi-way valve is provided with electromagnetic valve and boom shock absorber valve, one end of the electromagnetic valve is connected with the pipeline connected with steering gear and priority valve, the other end of the electromagnetic valve is connected with boom shock absorber valve;One end of the boom shock absorber valve is connected with energy accumulator, the other end of the boom shock absorber valve is connected with the pipeline connected with boom multi-way valve and boom cylinder.

[0009] Further, the other end of the priority valve is connected with hydraulic pump, one end of the hydraulic pump is connected with hydraulic oil tank.

[0010] Further, one end of the boom shock absorber valve is connected with hydraulic oil tank.

[0011] Further, the steering gear comprises a check valve, a first overflow valve, a first reversing valve and a hydraulic motor, the steering cylinder is connected with the check valve, and the lower end of the check valve is provided with the first overflow valve.

[0012] Further, the lower end of the first overflow valve is provided with the reversing valve, and the lower end of the reversing valve is provided with the hydraulic motor.

[0013] Further, the check valve, the first overflow valve, the first reversing valve and the hydraulic motor are connected through pipelines.

[0014] Further, the priority valve is composed of a second overflow valve, a filter, a stop valve and a second reversing valve, and one end of the second overflow valve is provided with the filter.

[0015] Further, one end of the filter is provided with the stop valve, and one end of the stop valve is provided with the second reversing valve.

[0016] Further, one end of the second reversing valve is connected with the steering gear and the boom multi-way valve, and the other end of the second reversing valve is connected with the hydraulic pump.

[0017] Further, the second overflow valve, the filter, the stop valve and the second reversing valve are connected through pipelines.

[0018] Compared with the prior art, the loader hydraulic system for emergency steering has the advantages and positive effects that:

[0019] The accumulator, the electromagnetic valve and the boom shock absorber valve are connected through pipelines, so that parallel circuits are formed between the accumulator, the electromagnetic valve, the boom shock absorber valve and the steering cylinder, the accumulator is controlled to contract the steering cylinder through power-on and power-off of the electromagnetic valve, steering work is performed, the steering of the vehicle can be realized when the engine fails, and the vehicle can be timely steered when the vehicle encounters an emergency, so that the occurrence of danger is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings constituting a part of the specification of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application.

[0021] Figure 1 is a working principle diagram of the loader hydraulic system for emergency steering of the present application;

[0022] Figure 2 is a working principle diagram of the steering gear of the present application;

[0023] Figure 3 is a working principle diagram of the priority valve of the present application;

[0024] Figure: 1, steering cylinder; 2, steering gear; 21, check valve; 22, first overflow valve; 23, first reversing valve; 24, hydraulic motor; 3, priority valve; 31, second overflow valve; 32, filter; 33, second reversing valve; 34, stop valve; 4, hydraulic pump; 5, hydraulic oil tank; 6, solenoid valve; 7, boom multi-way valve; 8, boom shock absorber valve; 9, accumulator; 10, boom cylinder. DETAILED DESCRIPTION

[0025] It should be noted that the following detailed description is exemplary and is intended to further explain the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0026] The loader is controlled by the steering gear to realize steering of the steering cylinder, and the oil inlet of the steering gear is provided by the pump driven by the engine. When the vehicle fails, the engine cannot be started, and the vehicle cannot be steered. Once the vehicle stalls during construction and other emergency situations occur, the vehicle cannot be turned in an emergency, which may cause unnecessary danger.

[0027] The present application will be described in detail below with reference to the drawings. The embodiment discloses a loader hydraulic system suitable for emergency steering, as shown in the figure, comprising a steering cylinder 1, the steering cylinder 1 is connected with a steering gear 2, the steering gear 2 is connected with a priority valve 3; one end of the priority valve 3 is connected with a boom multi-way valve 7, the boom multi-way valve 7 is connected with a boom cylinder 10; Figure 1

[0028] One end of the boom multi-way valve 7 is provided with a solenoid valve 6 and a boom shock absorber valve 8, one end of the solenoid valve 6 is connected with the pipeline connected with the steering gear 2 and the priority valve 3, the other end of the solenoid valve 6 is connected with the boom shock absorber valve 8; one end of the boom shock absorber valve 8 is connected with an accumulator 9, the other end of the boom shock absorber valve 8 is connected with the pipeline connected with the boom multi-way valve 7 and the boom cylinder 10.

[0029] The steering during failure is realized by cooperation of the accumulator 9, the solenoid valve 6 and the boom shock absorber valve 8, that is, the accumulator 9, the solenoid valve 6 and the boom shock absorber valve 8 are connected in parallel circuit with the steering cylinder 1 through pipeline connection, the contraction of the accumulator 9 to the steering cylinder 1 is controlled by power-on and power-off of the solenoid valve 6 to realize steering work, that is, the steering of the vehicle can be realized when the engine fails, and the vehicle can be turned in time when the vehicle encounters an emergency, thereby avoiding danger.

[0030] ​The other end of the priority valve 3 is connected to the hydraulic pump 4, and one end of the hydraulic pump 4 is connected to the hydraulic oil tank 5. The priority valve 3 is an existing structure used in the field of construction machinery, especially in the steering systems of loaders and excavators. Its design purpose is to ensure that hydraulic oil is preferentially supplied to the steering system under high pressure and low flow conditions, thereby improving the safety and efficiency of operation.

[0031] One end of the boom damping valve 8 is connected to the hydraulic oil tank 5. A damping valve is a device used to control and reduce vibrations in fluid flow. Its main function is to absorb and neutralize vibrations through specific mechanical or hydraulic mechanisms, thereby improving the stability and reliability of the system. The boom damping valve 8 ensures the stability of the boom during operation.

[0032] like Figure 2 As shown, the steering gear 2 includes a one-way valve 21, a first relief valve 22, a first directional valve 23, and a hydraulic motor 24. The steering cylinder 1 is connected to the one-way valve 21, and the lower end of the one-way valve 21 is equipped with the first relief valve 22. The lower end of the first relief valve 22 is equipped with a directional valve, and the lower end of the directional valve is equipped with the hydraulic motor 24. The one-way valve 21, the first relief valve 22, the first directional valve 23, and the hydraulic motor 24 are connected by pipelines. The steering gear 2 is an existing structure. The steering of the loader is achieved through the steering gear 2. By energizing and de-energizing the solenoid valve 6, the accumulator 9 is controlled to retract the steering cylinder 1 to perform steering operations, realizing steering in case of failure.

[0033] like Figure 3 As shown, the priority valve 3 consists of a second relief valve 31, a filter 32, a shut-off valve 34, and a second directional valve 33. One end of the second relief valve 31 is equipped with the filter 32. One end of the filter 32 is equipped with the shut-off valve 34, and one end of the shut-off valve 34 is equipped with the second directional valve 33. One end of the second directional valve 33 is connected to the steering gear 2 and the boom multi-way valve 7, and the other end is connected to the hydraulic pump 4. The second relief valve 31, filter 32, shut-off valve 34, and second directional valve 33 are connected by pipelines. The priority valve 3 is mainly used to ensure that specific functions or operations in the hydraulic system have priority, and by controlling the flow of hydraulic oil, it achieves effective coordination and control between different systems.

[0034] Working principle of the loader hydraulic system:

[0035] When steering is performed under normal working conditions, the hydraulic pump 4 pumps the hydraulic oil in the hydraulic oil tank 5 to the left valve position of the second directional valve 33 of the priority valve 3. After flowing through the left valve position of the second directional valve 33, it enters the right valve position of the first directional valve 23 of the steering gear 2. After passing through the right valve position of the second directional valve 33, it enters the steering cylinder 1, thereby realizing steering.

[0036] In the normal working state, the oil return line, hydraulic oil enters the right valve position of the first reversing valve 23 through the steering oil cylinder 1, and then enters the hydraulic oil tank 5 through the pipeline, that is, the oil return is realized.

[0037] When the steering is needed in the case of engine failure, the accumulator 9 provides power to deliver hydraulic oil to the boom shock valve 8, the boom shock valve 8 delivers the electromagnetic valve 6, the electromagnetic valve 6 delivers the right valve position of the first reversing valve 23, and then enters the steering oil cylinder 1 to realize steering. By energizing and de-energizing the electromagnetic valve 6, the accumulator 9 is controlled to contract the steering oil cylinder 1, and the steering work is performed.

[0038] The accumulator 9 is of a prior structure, which can convert the energy in the system into compressed energy or potential energy at the appropriate time, and when the system needs it, the compressed energy or potential energy is converted into hydraulic pressure or gas pressure to release and supply the system again.

[0039] The accumulator 9 can also provide kinetic energy for the boom oil cylinder 10, so that the hydraulic oil enters the boom oil cylinder 10 through the left valve position of the boom shock valve 8, and at this time the electromagnetic valve 6 is in the closed state.

[0040] Although the specific embodiments of the utility model have been described in combination with the drawings, it is not a limitation on the protection scope of the utility model. Those skilled in the art should understand that various modifications or deformations made by those skilled in the art on the basis of the technical solutions of the utility model without creative labor are still within the protection scope of the utility model.

Claims

1. A loader hydraulic system suitable for emergency steering, characterized in that, It includes a steering cylinder, which is connected to a steering gear, and the steering gear is connected to a priority valve; one end of the priority valve is connected to a boom multi-way valve, and the boom multi-way valve is connected to the boom cylinder; One end of the boom multi-way valve is equipped with a solenoid valve and a boom damping valve. One end of the solenoid valve is connected to the pipeline connecting the steering gear and the priority valve, and the other end of the solenoid valve is connected to the boom damping valve. One end of the boom damping valve is connected to the accumulator, and the other end of the boom damping valve is connected to the pipeline connecting the boom multi-way valve and the boom cylinder.

2. A loader hydraulic system suitable for emergency steering as described in claim 1, characterized in that, The other end of the priority valve is connected to the hydraulic pump, and one end of the hydraulic pump is connected to the hydraulic oil tank.

3. A loader hydraulic system suitable for emergency steering as described in claim 1, characterized in that, One end of the boom shock absorber valve is connected to the hydraulic oil tank.

4. A loader hydraulic system suitable for emergency steering as described in claim 1, characterized in that, The steering gear includes a one-way valve, a first relief valve, a first directional valve, and a hydraulic motor. The steering cylinder is connected to the one-way valve, and the lower end of the one-way valve is provided with the first relief valve.

5. A loader hydraulic system suitable for emergency steering as described in claim 4, characterized in that, The lower end of the first overflow valve is provided with a directional valve, and the lower end of the directional valve is provided with a hydraulic motor.

6. A loader hydraulic system suitable for emergency steering as described in claim 5, characterized in that, The one-way valve, the first relief valve, the first directional valve, and the hydraulic motor are connected by pipelines.

7. A loader hydraulic system suitable for emergency steering as described in claim 1, characterized in that, The priority valve consists of a second relief valve, a filter, a shut-off valve, and a second directional valve, with a filter provided at one end of the second relief valve.

8. A loader hydraulic system suitable for emergency steering as described in claim 7, characterized in that, One end of the filter is equipped with a shut-off valve, and one end of the shut-off valve is equipped with a second reversing valve.

9. A loader hydraulic system suitable for emergency steering as described in claim 8, characterized in that, One end of the second directional valve is connected to the steering gear and boom multi-way valve, and the other end of the second directional valve is connected to the hydraulic pump.

10. A loader hydraulic system suitable for emergency steering as described in claim 8, characterized in that, The second relief valve, filter, shut-off valve and second directional valve are connected by pipelines.

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