Emergency steering system of mining dump truck

Abstract

The utility model relates to the technical field of hydraulic systems of engineering trucks, in particular to an emergency steering system of a mining dump truck, which comprises an oil tank, a steering mechanism, a main oil supply pipeline, an oil return pipeline, a steering gear, an emergency oil supply system and a shuttle valve, the steering mechanism comprises a steering oil cylinder, and a first cavity and a second cavity of the steering oil cylinder are respectively connected with a working oil way; a hydraulic main pump is arranged on the main oil supply pipeline and connected with a driving mechanism, and the steering gear is connected with the steering oil cylinder and used for achieving vehicle steering. The emergency oil supply system comprises at least two emergency oil supply pipelines connected with the main oil supply pipeline in parallel, and each emergency oil supply pipeline is provided with an emergency motor pump set and a one-way valve. And the shuttle valve is arranged at the junction of the emergency oil supply pipeline and the main oil supply pipeline. According to the utility model, an emergency steering scheme of the double-motor pump set is adopted, so that the cost is lower than that of a conventional scheme using an energy accumulator, and the spatial arrangement is compact.

Description

Technical Field

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

[0002] In order to prevent the steering system from failing and causing safety accidents, mining dump trucks are often equipped with emergency steering systems during driving. That is, when the steering system fails, the emergency steering system quickly intervenes to realize the steering function of the vehicle.

[0003] At present, the emergency steering system of mining dump trucks is mostly in the form of accumulators and single-motor emergency pump sets. Larger tonnage mining dump trucks basically use accumulator emergency steering systems. The accumulators usually used in this system have large capacity and high cost. In addition, the accumulators are often in a pressure-maintaining state. Disassembly and maintenance require pressure relief, which is inconvenient to operate and poses safety risks. Utility Model Content

[0004] In order to solve the problem in the prior art that the emergency steering system adopts an accumulator form and the operation remains unchanged, which poses a safety risk, the utility model provides an emergency steering system for a mining dump truck that ensures safety.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An emergency steering system for a mining dump truck, comprising:

[0007] tank;

[0008] A steering mechanism, wherein the steering mechanism comprises a steering cylinder, wherein a first chamber and a second chamber of the steering cylinder are respectively connected to a working oil circuit;

[0009] A main oil supply pipeline and an oil return pipeline, wherein the main oil supply pipeline is provided with a hydraulic main pump, and the hydraulic main pump is connected to a driving mechanism,

[0010] A steering gear, which is connected to the steering cylinder and is used to achieve vehicle steering;

[0011] An emergency oil supply system, the emergency oil supply system comprising at least two emergency oil supply pipelines connected in parallel with the main oil supply pipeline, each emergency oil supply pipeline being provided with an emergency motor pump set and a one-way valve;

[0012] The shuttle valve is arranged at the junction of the emergency oil supply pipeline and the main oil supply pipeline. The shuttle valve can prevent the steering system pressure shock from damaging the steering hydraulic main pump, and on the other hand, prevent the hydraulic main pump from being reversed when the emergency motor is working, resulting in failure of the emergency function.

[0013] Furthermore, the oil inlet pipeline is also provided with a priority valve and an oil inlet filter for protecting the cleanliness of the hydraulic oil entering the priority valve.

[0014] Furthermore, the steering gear comprises a metering motor and a steering valve, and a steering check valve is provided at the inlet of the metering motor and the steering valve.

[0015] Furthermore, the steering gear also includes an overload brake valve arranged corresponding to the working oil circuit, and the overload brake valve is connected between the working oil circuit and the return oil pipeline.

[0016] Furthermore, the steering gear also includes an oil replenishment one-way valve arranged corresponding to the working oil circuit, and the oil replenishment one-way valve is connected between the working oil circuit and the oil return pipeline.

[0017] Furthermore, the emergency oil supply pipeline is also connected to a safety valve.

[0018] Furthermore, a cooler and an oil return filter are provided on the oil return pipeline.

[0019] Furthermore, the main oil supply pipeline is connected to a first pressure gauge, and the emergency oil supply pipeline is connected to a second pressure gauge.

[0020] Furthermore, a pressure switch is connected to the emergency oil supply pipeline.

[0021] Furthermore, the oil tank is provided with a liquid level gauge and an air filter. The air filter can prevent particulate pollutants from invading the system through the oil tank breathing port, and can also prevent particulate pollutants from mixing into the oil during refueling.

[0022] Beneficial effects:

[0023] (1) Cost saving: The utility model adopts an emergency steering solution of a dual motor pump group, which is cheaper than the conventional solution using an accumulator and has a compact space layout.

[0024] (2) Safe and reliable: The utility model adopts the principle of dual motor emergency pump groups working simultaneously. If one motor pump group is damaged, the remaining motor pump group can still maintain the vehicle's steering ability, better ensuring the safety of the entire vehicle. At the same time, since the traditional emergency solution uses an accumulator as a pressure vessel solution, long-term pressure maintenance will reduce the service life and reliability of the accumulator, and the dual motor pump group is a good solution to this problem.

[0025] (3) Easy maintenance: The utility model adopts the principle of emergency steering of a dual motor pump group. The steering system automatically releases pressure after shutdown, making disassembly and maintenance easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 The utility model is a schematic diagram of the principle of an emergency steering system for a mining dump truck.

[0028] 1. Oil tank, 1-1. Main oil supply pipeline, 1-2. Oil return pipeline, 1-3. Emergency oil supply pipeline, 2. Liquid level gauge, 3. Driving mechanism, 4. Hydraulic main pump, 5-1. First pressure gauge, 5-2. Second pressure gauge, 6-1. First check valve, 6-2. Second check valve, 7. Shuttle valve, 8. Oil inlet filter, 9. Priority valve, 10. Steering gear, 10-1. Steering check valve, 10-2. Metering motor and steering valve, 10-3. First oil replenishment check valve, 10-4. First overload brake valve, 10-5. Second overload brake valve, 10-6 , the second oil replenishment one-way valve, 11, steering mechanism, 11-1, the first steering cylinder, 11-2, the second steering cylinder, 11-3, the first working oil circuit, 11-4, the second working oil circuit, 12, cooler, 13, pressure switch, 14, the first emergency motor pump group, 14-1, the first emergency motor, 14-2, the first emergency pump, 14-3, the first safety valve, 15, return oil filter, 16, air filter, 17, the second emergency motor pump group, 17-1, the second emergency motor, 17-2, the second emergency pump, 17-3, the second safety valve. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0032] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0033] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0035] like Figure 1 , is an emergency steering system for a mining dump truck of the utility model, comprising a fuel tank 1, a steering mechanism 11, a main oil supply pipeline 1-1 and an oil return pipeline 1-2, a steering gear 10, an emergency oil supply system and a shuttle valve 7, the steering mechanism 11 comprises a steering cylinder, the first chamber and the second chamber of the steering cylinder are respectively connected to the working oil circuit; a hydraulic main pump 4 is arranged on the main oil supply pipeline 1-1, the hydraulic main pump 4 is connected to a driving mechanism 3, the driving mechanism 3 adopts a motor or an engine, the steering gear 10 is connected to the steering cylinder, and is used to realize vehicle steering; the emergency oil supply system comprises at least two emergency oil supply pipelines 1-3 connected in parallel with the main oil supply pipeline 1-1, each emergency oil supply pipeline 1-3 is provided with an emergency motor pump group and a one-way valve; the shuttle valve 7 is arranged at the junction of the emergency oil supply pipeline 1-3 and the main oil supply pipeline 1-1. As an embodiment of the utility model, the steering mechanism 11 includes a first steering oil cylinder 11-1 and a second steering oil cylinder 11-2, the working oil circuit includes a first working oil circuit 11-3 and a second working oil circuit 11-4, and the emergency oil supply system includes two emergency oil supply pipelines 1-3, one of which is provided with a first emergency motor pump group 14 and a first check valve 6-1, and the first emergency motor pump group 14 includes a first emergency motor 14-1 and a first emergency pump 14-2. The other emergency oil supply pipeline 1-3 is provided with a second emergency motor pump group 17 and a second check valve 6-2, and the second emergency motor pump group 17 includes a second emergency motor 17-1 and a second emergency pump 17-2.

[0036] The oil inlet pipeline is also provided with a priority valve 9 and an oil inlet filter 8 for protecting the cleanliness of the hydraulic oil entering the priority valve 9 .

[0037] The steering gear 10 includes a metering motor and a steering valve 10-2, and a steering check valve 10-1 is provided at the inlet of the metering motor and the steering valve 10-2. The steering gear 10 also includes an overload brake valve corresponding to the working oil circuit, and the overload brake valve is connected between the working oil circuit and the return oil pipeline 1-2. The steering gear 10 also includes an oil replenishment check valve corresponding to the working oil circuit, and the oil replenishment check valve is connected between the working oil circuit and the return oil pipeline 1-2. The overload brake valve includes a first overload brake valve 10-4 corresponding to the first working oil circuit 11-3 and a second overload brake valve 10-5 corresponding to the second working oil circuit 11-4. The oil replenishment check valve includes a first oil replenishment check valve 10-3 corresponding to the first working oil circuit 11-3 and a second oil replenishment check valve 10-6 corresponding to the second working oil circuit 11-4.

[0038] The emergency oil supply pipeline 1 - 3 is also connected with a safety valve, which includes a first safety valve 14 - 3 corresponding to the first emergency motor pump group 14 and a second safety valve 17 - 3 corresponding to the second emergency motor pump group 14 .

[0039] The return oil pipeline 1-2 is provided with a cooler 12 and a return oil filter 15. The main oil supply pipeline 1-1 is connected to a first pressure gauge 5-1, and the emergency oil supply pipeline 1-3 is connected to a second pressure gauge 5-2. The emergency oil supply pipeline 1-3 is connected to a pressure switch 13. The oil tank 1 is provided with a level gauge 2 and an air filter 16.

[0040] Working principle:

[0041] The oil tank 1 is an energy storage container for hydraulic oil and also provides heat dissipation for the hydraulic oil. The liquid level gauge 2 is installed on the oil tank 1 to display the position of the liquid level in the oil tank. The driving mechanism 3 provides a power source for the steering system during normal driving. The hydraulic main pump 4 provides hydraulic oil for the steering system during normal driving, converting the mechanical energy of the motor into hydraulic energy. The first pressure gauge 5-1 is installed at the outlet of the hydraulic main pump 4 to detect whether the hydraulic main pump 4 is working normally, and is also used for pressure detection for troubleshooting. The first one-way valve 6-1 and the second one-way valve 6-2 are respectively installed at the outlets of the first emergency pump 14-2 and the second emergency pump 17-2 to protect the first emergency pump 14-2 and the second emergency pump 17-2, to prevent the system pressure shock from damaging the first emergency pump 14-2 and the second emergency pump 17-2, and at the same time, to prevent the emergency motors 14-1 and 17-1 from reversing, resulting in failure of the emergency function. The shuttle valve 7 is used to protect the hydraulic pump 4, prevent the system pressure shock from damaging the hydraulic pump, and at the same time, prevent the hydraulic main pump 4 from reversing when the first emergency motor 14-1 and the second emergency motor 17-1 are working, resulting in the failure of the emergency function. The oil inlet filter 8 is used to protect the cleanliness of the hydraulic oil entering the priority valve 9, prevent the priority valve 9 from getting stuck, and cause the steering system to malfunction. The priority valve 9 can not only limit the maximum pressure of the system, but also ensure the flow of the steering system, and can also reduce the energy consumption of the hydraulic system when the steering gear is not working. The steering gear 10 is the core component of the steering system, and the vehicle is turned left and right by driving the steering gear forward and reversely by the steering wheel. The first steering cylinder 11-1 and the second steering cylinder 11-2 are the driving components of the steering mechanism, and the steering function of the vehicle is realized by driving the pull arm on the steering bridge. The cooler 12 is used to dissipate heat for the hydraulic system to ensure that the temperature of the hydraulic oil does not exceed the applicable range. The pressure switch 13 is used to monitor the pressure of the emergency pump and output the signal to the controller, and feedback to the driver that the emergency steering is in working state through the alarm display on the control panel. The first emergency motor pump group 14 and the second emergency motor pump group 17 are used to provide power source and hydraulic oil source for the steering system in an emergency state. The first emergency motor pump group 14 and the second emergency motor pump group 17 are respectively integrated with the first safety valve 14-3 and the second safety valve 17-3, which are used to limit the maximum pressure of the emergency system and play a safety protection role. The steering gear 10 is internally integrated with a steering check valve 10-1, a metering motor and a steering valve 10-2, a first oil replenishment check valve 10-3, a second oil replenishment check valve 10-6, a first overload brake valve 10-4 and a second overload brake valve 10-5. Among them, the steering check valve 10-1 has the function of preventing the oil inlet of the steering gear from flowing back, the metering motor and the steering valve 10-2 control the direction and flow rate entering the steering cylinder, the first overload brake valve 10-4 and the second overload brake valve 10-5 have an overload protection function, and also have a braking buffering function for the first steering cylinder 11-1 and the second steering cylinder 11-2.

[0042] The utility model adopts the emergency steering principle of the dual motor emergency pump group. When the vehicle steering system fails, the dual emergency motor pump groups work simultaneously to ensure the steering response and emergency function. If one of the dual emergency pump groups fails again, the vehicle can still have the steering function, but the driver needs to turn the steering wheel more times, thus ensuring the safety of the vehicle to the greatest extent.

[0043] The emergency steering system of the dual motor emergency pump unit is equipped with a check valve and a pressure gauge. The pressure gauge can detect the pressure of the emergency system in real time, which is convenient for steering system fault diagnosis and troubleshooting. The check valve can prevent the emergency motor from being reversely dragged, resulting in the failure of the emergency function.

[0044] The emergency steering system of the dual motor emergency pump unit is equipped with a shuttle valve 7. On the one hand, it can prevent the steering system pressure shock from damaging the steering hydraulic main pump, and on the other hand, it can prevent the hydraulic main pump 4 from being reversed when the emergency motor is working, resulting in the failure of the emergency function.

[0045] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. An emergency steering system for a mining dump truck, characterized in that: include: Fuel tank (1); A steering mechanism (11), the steering mechanism (11) comprising a steering oil cylinder, wherein a first chamber and a second chamber of the steering oil cylinder are respectively connected to a working oil circuit; A main oil supply pipeline (1-1) and an oil return pipeline (1-2), wherein the main oil supply pipeline (1-1) is provided with a hydraulic main pump (4), and the hydraulic main pump (4) is connected to a driving mechanism (3). A steering gear (10), wherein the steering gear (10) is connected to a steering cylinder and is used to achieve vehicle steering; An emergency oil supply system, the emergency oil supply system comprising at least two emergency oil supply pipelines (1-3) connected in parallel with a main oil supply pipeline (1-1), each emergency oil supply pipeline (1-3) being provided with an emergency motor pump set and a one-way valve; A shuttle valve (7), wherein the shuttle valve (7) is arranged at the junction of the emergency oil supply pipeline (1-3) and the main oil supply pipeline (1-1).

2. The emergency steering system for a mining dump truck according to claim 1, characterized in that: The main oil supply pipeline (1-1) is also provided with a priority valve (9) and an oil inlet filter (8) for protecting the cleanliness of the hydraulic oil entering the priority valve (9).

3. The emergency steering system for a mining dump truck according to claim 1, characterized in that: The steering gear (10) comprises a metering motor and a steering valve (10-2), wherein the inlets of the metering motor and the steering valve (10-2) are provided with a steering check valve (10-1).

4. The emergency steering system for a mining dump truck according to claim 3, characterized in that: The steering gear (10) also includes an overload brake valve arranged corresponding to the working oil circuit, and the overload brake valve is connected between the working oil circuit and the oil return pipeline (1-2).

5. The emergency steering system for a mining dump truck according to claim 3, characterized in that: The steering gear (10) also includes an oil replenishment one-way valve arranged corresponding to the working oil circuit, wherein the oil replenishment one-way valve is connected between the working oil circuit and the oil return pipeline (1-2).

6. The emergency steering system for a mining dump truck according to claim 1, characterized in that: The emergency oil supply pipeline (1-3) is also connected with a safety valve.

7. The emergency steering system for a mining dump truck according to claim 1, characterized in that: The oil return pipeline (1-2) is provided with a cooler (12) and an oil return filter (15).

8. The emergency steering system for a mining dump truck according to claim 1, characterized in that: The main oil supply pipeline (1-1) is connected to a first pressure gauge (5-1), and the emergency oil supply pipeline (1-3) is connected to a second pressure gauge (5-2).

9. The emergency steering system for a mining dump truck according to claim 1, characterized in that: The emergency oil supply pipeline (1-3) is connected with a pressure switch (13).

10. The emergency steering system for a mining dump truck according to claim 1, characterized in that: The oil tank (1) is provided with a liquid level meter (2) and an air filter (16).

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