Power system, steering and lifting system and vehicle with same

Abstract

The utility model provides a power system, a steering and lifting system and a vehicle with the steering and lifting system. The power system comprises a hydraulic system, the hydraulic system comprises a lifting hydraulic system and a steering hydraulic system, and the lifting hydraulic system is communicated with the steering hydraulic system through a confluence pipeline; the safety protection device at least comprises an oil return protection pipeline and a pressure relief protection unit, one end of the oil return protection pipeline is communicated with the oil storage device, the other end of the oil return protection pipeline is communicated with the confluence pipeline, and the pressure relief protection unit is arranged on the oil return protection pipeline and used for adjusting the opening degree of the oil return protection pipeline. According to the scheme, the problem that internal working elements are damaged due to the fact that the working pressure of a steering hydraulic system is too high in the prior art is solved, and the safety of a power system is improved.

Description

Technical Field

[0001] This utility model relates to the field of power system technology, specifically to a power system, a steering and lifting system, and a vehicle having the same. Background Technology

[0002] In existing technology, the steering and lifting hydraulic systems of mining trucks are usually designed independently. However, in some models, to increase lifting speed or reduce the displacement of the main lifting pump, the steering pump of the steering hydraulic system supplies auxiliary fluid to the lifting hydraulic system via a priority valve. The priority valve is designed to prioritize fluid supply to the steering hydraulic system when the vehicle is steering, while allowing fluid from the steering pump to flow to the lifting hydraulic system when not steering. However, in this combined flow mode, when the steering pump supplies fluid to the lifting hydraulic system, the relief valve of the steering hydraulic system becomes ineffective, and the working pressure of the steering hydraulic system rises to the relief pressure of the lifting hydraulic system (typically 22MPa–25MPa), far exceeding the normal operating pressure of the steering hydraulic system (typically 16MPa–18MPa). The steering pump motor needs to operate under high pressure, which can easily lead to overload and potentially damage the motor.

[0003] No effective solution has yet been proposed to address the aforementioned technical issues. Utility Model Content

[0004] The main objective of this invention is to provide a power system, a steering and lifting system, and a vehicle having the same, in order to solve the problem of damage to internal working components caused by excessive working pressure in the existing steering hydraulic system.

[0005] To achieve the above objectives, according to one aspect of the present invention, a power system is provided, comprising: a hydraulic system, the hydraulic system including a lifting hydraulic system and a steering hydraulic system, the lifting hydraulic system and the steering hydraulic system being connected through a confluence pipeline; and a safety protection device, the safety protection device including at least a return oil protection pipeline and a pressure relief protection unit, one end of the return oil protection pipeline being connected to an oil storage device, the other end of the return oil protection pipeline being connected to the confluence pipeline, and the pressure relief protection unit being disposed on the return oil protection pipeline for adjusting the opening degree of the return oil protection pipeline.

[0006] Furthermore, the pressure relief protection unit has a first working state of closing the return oil protection pipeline and a second working state of opening the return oil protection pipeline.

[0007] Furthermore, the safety protection device also includes a locking protection unit, which is installed on the merging pipe and has a conducting state for opening the merging pipe and a closing state for closing the merging pipe.

[0008] Furthermore, when the liquid flow direction in the merging pipeline is from the steering hydraulic system to the lifting hydraulic system, the lock-up protection unit is in the on state, and / or when the liquid flow direction in the merging pipeline is from the lifting hydraulic system to the steering hydraulic system, the lock-up protection unit is in the off state.

[0009] Furthermore, the safety protection device also includes: a detection unit, which is used to detect at least a first pressure at the connection point between the steering hydraulic system and the merging pipeline, and a second pressure at least at the connection point between the lifting hydraulic system and the merging pipeline; and a control unit, which is electrically connected to the detection unit, the pressure relief protection unit, and the lock-up protection unit.

[0010] Furthermore, the detection unit includes a first pressure detection element and a second pressure detection element. The first pressure detection element is located at the connection point between the steering hydraulic system and the merging pipeline, and the second pressure detection element is located at the connection point between the lifting hydraulic system and the merging pipeline. Both the first pressure detection element and the second pressure detection element are electrically connected to the control unit.

[0011] Furthermore, the locking protection unit includes a check valve, which is located on the confluence line and allows flow from the steering hydraulic system to the lifting hydraulic system.

[0012] Furthermore, the pressure relief protection unit includes an overflow valve, the outlet of which is connected to the oil storage device through a return oil protection pipeline, and the inlet of which is connected to the confluence pipeline.

[0013] Furthermore, the steering hydraulic system includes at least a priority valve, and the lifting hydraulic system includes at least a lifting main valve. The secondary outlet of the priority valve is connected to the inlet of the lifting main valve through a confluence pipeline.

[0014] Furthermore, a return oil filter is also installed on the return oil protection pipeline.

[0015] Furthermore, the connection point between the return oil protection line and the confluence line is located near the steering hydraulic system, and / or the lock-up protection unit is located near the lifting hydraulic system.

[0016] According to another aspect of the present invention, a steering and lifting system is provided, including a power system, wherein the power system is the power system described above.

[0017] According to another aspect of the present invention, a vehicle is provided, which includes the aforementioned power system, or the vehicle includes the aforementioned steering and lifting system.

[0018] By applying the technical solution of this utility model, the return oil protection pipeline can guide the oil in the confluence pipeline back to the oil storage device, releasing the high pressure in the confluence pipeline. This prevents the drive motor of the steering hydraulic system from bearing excessive load when the steering hydraulic system supplies oil to the lifting hydraulic system, thereby reducing the probability of motor overload damage and the damage rate of hydraulic components within the steering hydraulic system. The pressure relief protection unit is used to adjust the opening of the return oil protection pipeline, allowing the system to dynamically adjust the return oil flow and speed according to actual working conditions for better pressure and flow control. For example, when the hydraulic system is under high load or when multiple operations such as steering and lifting are performed simultaneously, appropriately increasing the opening of the return oil protection pipeline can quickly reduce system pressure and prevent component overload. The technical solution of this utility model solves the problem of damage to internal working components caused by excessive working pressure in the steering hydraulic system in the prior art, improving the safety of the power system. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram illustrating the structural principle of an embodiment of the power system according to the present invention is shown.

[0021] The above figures include the following reference numerals:

[0022] 1. Lifting hydraulic system; 11. Lifting main valve; 12. Lifting cylinder; 13. Lifting gear pump;

[0023] 2. Steering hydraulic system; 21. Priority valve; 22. Steering gear; 23. Steering cylinder; 24. High-pressure filter; 25. Steering gear pump;

[0024] 3. Safety protection devices; 31. Oil return protection pipeline; 32. Pressure relief protection unit; 33. Locking protection unit;

[0025] 4. Combination piping;

[0026] 5. Oil storage device;

[0027] 6. Oil return filter. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0032] To facilitate the explanation of the technical effects of the technical solution in this application, the power system in the prior art is described as follows:

[0033] In existing technology, the steering hydraulic system 2 and lifting hydraulic system 1 of mining trucks are usually designed independently. However, in some models, to increase the lifting speed or reduce the displacement of the main lifting pump, the steering pump of the steering hydraulic system 2 supplies auxiliary fluid to the lifting hydraulic system through a priority valve 21. The design principle of the priority valve 21 is to prioritize the fluid supply to the steering hydraulic system 2 when the vehicle is turning, while allowing the fluid from the steering pump to flow to the lifting hydraulic system 1 when the vehicle is not turning. However, in this combined flow mode, the pressure balance problem between the steering hydraulic system 2 and the lifting hydraulic system 1 is not effectively solved, mainly due to the following technical problems:

[0034] Problem 1): Overload of the steering pump drive motor: When the steering pump supplies oil to the lifting hydraulic system 1, the relief valve of the steering hydraulic system 2 becomes ineffective. The working pressure of the steering hydraulic system 2 will rise to the relief pressure of the lifting hydraulic system 1 (usually 22MPa~25MPa), which is much higher than the normal operating pressure of the steering hydraulic system 2 (usually 16MPa~18MPa). The steering pump motor needs to operate under high pressure, which can easily lead to overload and may eventually damage the motor.

[0035] Question 2): Hydraulic oil reverse flow: When the lifting operation is completed, the high-pressure oil generated by the lifting pump may flow back into the pipeline of the steering hydraulic system 2, causing impact on the hydraulic components in the steering hydraulic system 2 and resulting in damage to these components.

[0036] Combination Figure 1 As shown, according to a specific embodiment of this application, a power system is provided.

[0037] Specifically, the power system includes a hydraulic system and a safety protection device 3. The hydraulic system includes a lifting hydraulic system 1 and a steering hydraulic system 2, which are connected by a confluence pipe 4. The safety protection device 3 includes at least a return oil protection pipe 31 and a pressure relief protection unit 32. One end of the return oil protection pipe 31 is connected to an oil storage device 5, and the other end is connected to the confluence pipe 4. The pressure relief protection unit 32 is installed on the return oil protection pipe 31 and is used to adjust the opening of the return oil protection pipe 31.

[0038] By applying the technical solution of this embodiment, the return oil protection line 31 can guide the oil in the confluence line 4 back to the oil storage device 5, releasing the high pressure in the confluence line 4. This prevents the drive motor of the steering hydraulic system 2 from bearing excessive load when the steering hydraulic system 2 supplies oil to the lifting hydraulic system 1, thereby reducing the probability of motor overload damage and the damage rate of hydraulic components within the steering hydraulic system 2. The pressure relief protection unit 32 is used to adjust the opening of the return oil protection line 31, allowing the system to dynamically adjust the return oil flow rate and speed according to actual working conditions to better control pressure and flow. For example, when the hydraulic system is under high load or when multiple operations such as steering and lifting are performed simultaneously, appropriately increasing the opening of the return oil protection line 31 can quickly reduce system pressure and prevent component overload. The technical solution of this embodiment solves the problem of damage to internal working components caused by excessive working pressure in the steering hydraulic system 2 in the prior art, improving the safety of the power system.

[0039] It should be noted that in this embodiment, the lifting hydraulic system 1 and the steering hydraulic system 2 are set independently. The lifting hydraulic system 1 is used to transport oil from the oil storage position to the lifting cylinder, and the steering hydraulic system 2 is used to transport oil from the oil storage position to the steering cylinder. The steering hydraulic system 2 can transport oil to the lifting hydraulic system 1 under certain circumstances, or it can only transport oil to the steering cylinder.

[0040] It should be noted that, in order to achieve intelligent adjustment of the opening of the return oil protection pipeline 31, an electronic proportional valve can also be installed on the return oil protection pipeline 31 to automatically adjust the opening according to a preset algorithm. For example, when the system pressure is high, the opening is increased to accelerate the oil return flow and reduce the system pressure; conversely, when the system pressure is low, the opening is decreased to reduce the return oil and maintain sufficient operating pressure.

[0041] It should be understood that the opening degree of the return oil protection pipeline 31 can be set in various ways according to specific needs. For example, the opening degree of the return oil protection pipeline 31 can be divided into four types: 0 opening degree, 1 / 3 opening degree, 2 / 3 opening degree, and 1 opening degree. Alternatively, it can be set to three types: 0 opening degree, 1 / 2 opening degree, and 1 opening degree. The number of opening degree settings is set according to the actual required adjustment accuracy.

[0042] Furthermore, the pressure relief protection unit 32 has a first working state of closing the return oil protection line 31 and a second working state of opening the return oil protection line 31.

[0043] In the embodiments of this application, when the pressure relief protection unit 32 is in the second working state, the return oil protection line 31 is connected to the confluence line 4. Under normal lifting operation conditions, the pressure relief protection unit 32 is in the first working state, the return oil protection line 31 is closed, and the lifting hydraulic system 1 and the steering hydraulic system 2 work together. The steering hydraulic system 2 supplies oil to the lifting hydraulic system 1 through the confluence line 4 to accelerate the lifting action, reduce the operation cycle, and thus improve the working efficiency of the power system. When the output pressure on the connection side of the steering hydraulic system 2 and the confluence line 4 exceeds the safety threshold, the pressure relief protection unit 32 automatically opens and switches to the second working state. The return oil protection line 31 is used to guide the excess oil back to the oil storage device 5, releasing the high pressure in the confluence line 4, avoiding excessive load on the drive motor of the steering hydraulic system 2, thereby significantly reducing the probability of motor overload damage and the damage rate of hydraulic components in the steering hydraulic system 2.

[0044] It should be understood that in the first working state, the return oil protection line 31 is disconnected from the confluence line 4. In the second working state, the return oil protection line 31 can have multiple opening degrees to achieve precise adjustment of the pressure in the confluence line 4.

[0045] In one exemplary embodiment of this application, a temperature-sensitive element and a flow regulating valve may also be installed in the return oil protection line 31. The temperature-sensitive element automatically adjusts the opening size of the flow regulating valve according to the oil temperature to maintain the oil within the optimal operating temperature range. At high temperatures, the return oil flow is increased to help cool the system; at low temperatures, the return oil flow is decreased to maintain the system temperature. This design can effectively extend the life of hydraulic components while improving the thermal management capability of the entire system.

[0046] In another exemplary embodiment of this application, an alarm indicator and diagnostic sensors are installed near the return oil protection pipeline 31 to monitor the operating status and potential faults of the return oil protection pipeline 31. Once an abnormality is detected, such as oil leakage, pipeline blockage, or valve failure, the system will immediately trigger an alarm and transmit the fault information to the central control system so that timely measures can be taken to repair the problem and prevent the accident from escalating.

[0047] Furthermore, the safety protection device 3 also includes a locking protection unit 33, which is disposed on the merging pipe 4. The locking protection unit 33 has a conducting state that connects the merging pipe 4 and a closing state that closes the merging pipe 4.

[0048] In this embodiment, in the on state, the locking protection unit 33 allows the hydraulic fluid of the lifting hydraulic system 1 and the steering hydraulic system 2 to merge through the confluence pipe 4, jointly providing hydraulic fluid to the lifting hydraulic system 1 and accelerating the lifting process; in the off state, the locking protection unit 33 will cut off the confluence pipe 4 to prevent the flow of hydraulic fluid, thereby isolating the lifting hydraulic system 1 and the steering hydraulic system 2, avoiding the interaction between the lifting hydraulic system 1 and the steering hydraulic system 2 and system overload.

[0049] In practical applications, for example, when a vehicle is being lifted, if the steering system is detected to require an immediate response—for instance, if the vehicle is turning and suddenly needs to be lifted (common in complex mining environments)—the locking protection unit 33 will switch to the off state, cutting off the merging line 4. This ensures that the hydraulic fluid supplied by the steering hydraulic system 2 is not diverted to the lifting hydraulic system 1, but instead prioritizes meeting the steering needs to maintain vehicle steering control. Conversely, when the steering and lifting systems are operating simultaneously and the steering system does not require an immediate response, the locking protection unit 33 will be in the on state, allowing the hydraulic fluid from the steering hydraulic system 2 to supply oil to the lifting system through the merging line 4. This fully utilizes the remaining hydraulic fluid in the steering hydraulic system 2, accelerating the lifting action of the lifting system and improving operational efficiency.

[0050] Optionally, when the liquid flow direction in the confluence pipe 4 is from the steering hydraulic system 2 to the lifting hydraulic system 1, the lock-up protection unit 33 is in the conducting state.

[0051] In this embodiment, when the liquid flow direction in the confluence pipe 4 is from the steering hydraulic system 2 to the lifting hydraulic system 1, the lock-up protection unit 33 should be in the conducting state. The lock-up protection unit 33 will not prevent the normal flow of oil, allowing the steering hydraulic system 2 to provide additional oil to the lifting system and speed up the lifting process.

[0052] Optionally, when the liquid flow direction in the confluence pipe 4 is from the lifting hydraulic system 1 to the steering hydraulic system 2, the locking protection unit 33 is in the closed state.

[0053] In this embodiment, when the liquid flow direction in the confluence pipe 4 is from the lifting hydraulic system 1 to the steering hydraulic system 2, the lock-up protection unit 33 switches to the closed state. At this time, the lock-up protection unit 33 will cut off the reverse flow path of the oil to prevent the high-pressure oil of the lifting hydraulic system 1 from entering the steering hydraulic system 2, ensuring that the liquid can only flow from the steering hydraulic system 2 to the lifting hydraulic system 1, and avoiding damage to the hydraulic components of the steering hydraulic system 2.

[0054] Specifically, the direction of liquid flow in the confluence pipe 4 can be determined by the pressure obtained from detection at different locations in the confluence pipe 4.

[0055] In a preferred embodiment of this application, when the liquid flow direction in the confluence pipe 4 is from the steering hydraulic system 2 to the lifting hydraulic system 1, the locking protection unit 33 is in the on state; and when the liquid flow direction in the confluence pipe 4 is from the lifting hydraulic system 1 to the steering hydraulic system 2, the locking protection unit 33 is in the off state. This ensures that the confluence pipe 4 is open when the flow direction is correct and closed when the flow is reversed, fully utilizing the oil from the steering hydraulic system 2 to supply oil to the lifting system while ensuring that the oil can only flow from the steering hydraulic system 2 to the lifting hydraulic system 1.

[0056] It should be noted that, in this embodiment, in addition to controlling the state of the locking protection unit 33 based on the liquid flow direction in the confluence pipe 4, the state of the locking protection unit 33 can also be adjusted based on the pressure value of the steering hydraulic system 2, the pressure value of the lifting hydraulic system 1, the steering angle, the steering response speed, the state of the components in the steering hydraulic system 2, the state of the components in the lifting hydraulic system 1, the current driving environment, etc.

[0057] Furthermore, the safety protection device 3 also includes a detection unit and a control unit. The detection unit is used to detect at least the first pressure at the connection position between the steering hydraulic system 2 and the confluence pipe 4, and the detection unit is used to detect at least the second pressure at the connection position between the lifting hydraulic system 1 and the confluence pipe 4. The control unit is electrically connected to the detection unit, the pressure relief protection unit 32, and the locking protection unit 33.

[0058] In this embodiment, by being electrically connected to the detection unit, the pressure relief protection unit 32, and the locking protection unit 33, the control unit can adjust the working state of at least one of the pressure relief protection unit 32 and the locking protection unit 33 according to the data (such as the first pressure and the second pressure) obtained by the detection unit, so as to realize automatic safety protection inside the power system and optimize system performance and protection.

[0059] Preferably, the control unit synchronously adjusts the working state of the pressure relief protection unit 32 and the locking protection unit 33 based on the data (such as the first pressure and the second pressure) obtained by the detection unit.

[0060] Specifically, the detection unit includes a first pressure detection element and a second pressure detection element. The first pressure detection element is located at the connection position between the steering hydraulic system 2 and the merging pipeline 4, and the second pressure detection element is located at the connection position between the lifting hydraulic system 1 and the merging pipeline 4. Both the first pressure detection element and the second pressure detection element are electrically connected to the control unit.

[0061] In this embodiment, the first pressure detection element is used to detect the first pressure at the connection position between the steering hydraulic system 2 and the merging pipeline 4, and the second pressure detection element is used to detect the second pressure at the connection position between the lifting hydraulic system 1 and the merging pipeline 4.

[0062] In one exemplary embodiment of this application, the detection unit may further include a pressure detection element disposed at the connection point between the confluence pipe 4 and the return oil protection pipe 31, for detecting a third pressure at the connection point between the confluence pipe 4 and the return oil protection pipe 31. Depending on actual needs, environmental parameter sensors, such as temperature, humidity, and altitude, may also be installed on the confluence pipe 4 and the return oil protection pipe 31, so that the control unit can adjust the operating state of the pressure relief protection unit 32 and the lock-up protection unit 33 according to environmental changes. For example, under extreme temperature conditions, the control unit can adjust the opening pressure of the return oil protection pipe 31 to prevent system overload or performance degradation caused by excessively high or low oil temperatures. This allows the power system to maintain optimal operating conditions under various natural conditions, improving the system's environmental adaptability and reliability.

[0063] In another exemplary embodiment of this application, the control unit can integrate a fault prediction algorithm to continuously analyze the data detected by the detection elements and predict potential system faults. For impending overpressure or overload, the system will adjust the operating states of the pressure relief protection unit 32 and the locking protection unit 33 in advance to prevent motor damage and premature wear of hydraulic components. Simultaneously, the control unit can also integrate a self-diagnostic function to instantly identify and locate faults and provide maintenance suggestions, thereby maintaining the health of the entire hydraulic system.

[0064] It should be noted that the control unit can be a control chip or hardware integrated inside the power system and set on the return oil protection line 31, or it can be integrated into a remote control terminal. The remote control terminal can communicate with the detection unit, the pressure relief protection unit 32 and the lock-up protection unit 33 through wireless or wired communication. At the same time, the remote control terminal can also be equipped with a human-machine interface, so that the operator can view the status of the power system in real time, set operating parameters, and manually intervene in the power system when necessary.

[0065] It should be understood that the control unit may also include multiple control modules, including a first control module for controlling the pressure relief protection unit 32 and a second control module for controlling the locking protection unit 33. Each control module can be integrated with its corresponding controlled object; for example, the first control module can be integrated with the pressure relief protection unit 32, and the second control module can be integrated with the locking protection unit 33. The first and second control modules respectively receive detection data from the detection elements, thereby controlling the operating status of their respective controlled objects. The control modules may integrate communication elements to collect the operating data of the pressure relief protection unit 32 and the locking protection unit 33 and send it to a remote control terminal.

[0066] Furthermore, the locking protection unit 33 includes a one-way valve, which is installed on the confluence line 4. The one-way valve allows flow from the steering hydraulic system 2 to the lifting hydraulic system 1. As a structure that only allows flow in one direction, the one-way valve can effectively prevent backflow of liquid in the confluence line 4.

[0067] Specifically, check valves can be intelligent hydraulic check valves, electromagnetically controlled intelligent check valves, or simple mechanical check valves. To further ensure system safety, redundant check valve structures can also be implemented.

[0068] Furthermore, the pressure relief protection unit 32 includes an overflow valve, the outlet of which is connected to the oil storage device 5 through the return oil protection pipeline 31, and the inlet of which is connected to the confluence pipeline 4.

[0069] In this embodiment, the relief valve can be set to a constant pressure threshold. When the pressure of the steering hydraulic system reaches or exceeds this threshold, the valve opens to release the excess pressure. By reasonably setting the pressure value of the relief valve, it can be ensured that the return oil protection pipeline 31 opens in time, thereby improving the response speed of the return protection mechanism.

[0070] In a preferred embodiment of this application, the pressure relief protection unit 32 and the locking protection unit 33 can be integrated into a single component, such as... Figure 1As shown, an integrated overflow check valve is installed, which can simultaneously realize the functions of an overflow valve and a check valve. The integrated overflow check valve has a return port T, a working port A, and an inlet port P. The integrated overflow check valve is installed on the confluence pipeline 4. The return port T of the integrated overflow check valve is connected to the oil storage device 5 through the return oil protection pipeline 31. The inlet port P of the integrated overflow check valve is close to the side where the steering hydraulic system 2 is located, and the working port A is close to the side where the lifting hydraulic system 1 is located.

[0071] Furthermore, the steering hydraulic system 2 includes at least a priority valve 21, and the lifting hydraulic system 1 includes at least a lifting main valve 11. The secondary oil outlet of the priority valve 21 is connected to the oil inlet of the lifting main valve 11 through the confluence pipe 4.

[0072] In this embodiment, the priority valve 21 is a functional element in the steering hydraulic system 2 that regulates the coordinated operation of the steering hydraulic system 2 and the lifting hydraulic system 1. The priority valve 21 can control the flow of hydraulic fluid from the steering hydraulic system 2 to the lifting hydraulic system 1 when the vehicle is turning, while allowing the hydraulic fluid from the steering hydraulic system 2 to flow to the lifting hydraulic system 1 when the vehicle is not turning. The lifting main valve 11 is a component in the lifting hydraulic system 1 that controls the flow of hydraulic fluid, ensuring that the lifting cylinder receives the required hydraulic fluid. In other words, the priority valve 21 and the lifting main valve 11 are respectively components that regulate the flow and supply of hydraulic fluid in the steering hydraulic system 2 and the lifting hydraulic system 1. Placing the confluence pipe 4 between the priority valve 21 and the lifting main valve 11 simplifies the control logic of the power system, utilizing the regulating functions of the priority valve 21 and the lifting main valve 11 to achieve hydraulic fluid flow control.

[0073] Preferably, a return oil filter 6 is also provided on the return oil protection pipeline 31.

[0074] In this embodiment, the return oil filter 6 is used to filter impurities in the return oil, maintain the cleanliness of the oil, and extend the service life of hydraulic system components.

[0075] Optionally, the connection point between the return oil protection line 31 and the confluence line 4 is located close to the steering hydraulic system 2. In the confluence line 4, the longer the oil flow path, the greater the amount of oil retained and the greater the potential pressure accumulation. By setting the connection point close to the steering hydraulic system 2, the return oil path is shortened, the retained oil is reduced, and unnecessary pressure accumulation is avoided, thereby reducing the risk of motor overload in the steering hydraulic system 2.

[0076] Optionally, the lock-up protection unit 33 is positioned close to the lifting hydraulic system 1. Positioning the lock-up protection unit 33 close to the lifting hydraulic system 1 ensures that when high pressure is detected in the lifting system or when the steering system requires priority oil supply, the lock-up protection unit 33 can respond quickly and promptly close or open the confluence line 4. That is, this configuration reduces the response time of the power system, improves its responsiveness, and ensures that protective measures can be taken rapidly in emergency situations.

[0077] In a preferred embodiment of this application, the connection point between the return oil protection line 31 and the confluence line 4 is located close to the steering hydraulic system 2, and the lock-up protection unit 33 is located close to the lifting hydraulic system 1. By adopting a system layout where the connection point between the return oil protection line 31 and the confluence line 4 is close to the steering hydraulic system 2, and the lock-up protection unit 33 is close to the lifting hydraulic system 1, the oil flow and pressure can be controlled more effectively.

[0078] This application also provides a preferred embodiment of a power system.

[0079] like Figure 1 As shown, the power system includes a lifting hydraulic system 1 and a steering hydraulic system 2. The lifting hydraulic system 1 includes a lifting main valve 11, a lifting cylinder 12 and a lifting gear pump 13. The steering hydraulic system 2 includes a priority valve 21, a steering gear 22, a steering cylinder 23, a high-pressure filter 24 and a steering gear pump 25.

[0080] Specifically, the priority valve 21 has a main oil outlet CF, a secondary oil outlet EF, LS, an oil inlet P, and a return oil port T. The lifting main valve 11 has a working oil port A, a secondary oil inlet P1, an oil inlet P, and a return oil port T. The secondary oil outlet EF of the priority valve 21 is connected to the secondary oil inlet P1 of the lifting main valve 11 through the confluence pipe 4. The return oil ports T of the priority valve 21, the lifting main valve 11, and the relief valve converge into the same return oil protection pipe 31 and flow back to the oil storage device 5 after passing through the return oil filter 6.

[0081] In this embodiment, the oil storage device 5 is an oil tank used to supply oil to the lifting hydraulic system 1 and the steering hydraulic system 2, and the lifting gear pump 13 and the steering gear pump 25 are both used to pump the oil stored in the oil storage device 5.

[0082] According to another specific embodiment of this application, a steering and lifting system is provided, including a power system, which is the power system described in the above embodiment. The steering and lifting system in this embodiment can be applied to vehicles such as automobiles, airplanes, and ships.

[0083] Specifically, in addition to the power system, the steering and lifting system may also include a steering system for performing steering actions and a lifting system for performing lifting actions. The steering hydraulic system 2 of the power system provides power to the steering system, and the lifting hydraulic system 1 of the power system provides power to the hydraulic system. For example, the steering system may include structural components such as a steering wheel, steering column, steering tie rod, steering knuckle, and steering gear, while the lifting system may include structural components such as a lifting platform or bracket, control panel or handle, and locking device.

[0084] According to another specific embodiment of this application, a vehicle is provided, the vehicle having a steering and lifting system, the steering and lifting system being the steering and lifting system in the above embodiments.

[0085] Applying the aforementioned steering and lifting system to vehicles can increase the working speed of the lifting system and improve operational efficiency through the merging pipeline 4. The safety protection devices 3 (including the return oil protection pipeline 31, the pressure relief protection unit 32, and the locking protection unit 33) effectively prevent overload of the steering hydraulic system 2 during the merging process and the risk of damage to components caused by the reverse flow of high-pressure oil from the lifting system into the steering system. This enhances the stability of the vehicle under complex operating conditions, reduces maintenance and repair needs due to component overload or damage, lowers the total long-term operating cost, and improves the vehicle's availability and economy.

[0086] According to another specific embodiment of this application, a vehicle is provided, the vehicle having a power system, the power system being the power system in the above embodiment.

[0087] Applying the aforementioned power system to vehicles significantly increases lifting speed during lifting operations. By optimizing the merging and protection of the steering hydraulic system 2 and the lifting hydraulic system 1, the stability and safety of the steering hydraulic system 2 are enhanced, reducing maintenance costs and improving operational efficiency, enabling more efficient and safer vehicle operation. Applied to the automated operation of heavy vehicles such as mining trucks, especially during high-intensity operations, the power system in this embodiment can significantly increase lifting speed while protecting the steering hydraulic system 2 from damage, improving operational efficiency and safety. It is particularly suitable for unmanned or automated operation environments, effectively promoting the development of automated mining technology and enhancing the level of intelligence in the field of automated mining.

[0088] Specifically, in the embodiments of this application, the vehicle can be a mining truck, logistics truck, tractor, excavator, loader, or other vehicle that requires lifting and steering functions, or it can be an unmanned drive-by-wire new energy vehicle.

[0089] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0090] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this utility model.

[0091] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0092] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power system, characterized in that, include: The hydraulic system includes a lifting hydraulic system (1) and a steering hydraulic system (2), wherein the lifting hydraulic system (1) and the steering hydraulic system (2) are connected by a confluence pipe (4); Safety protection device (3), the safety protection device (3) includes at least a return oil protection pipeline (31) and a pressure relief protection unit (32). One end of the return oil protection pipeline (31) is connected to the oil storage device (5), and the other end of the return oil protection pipeline (31) is connected to the confluence pipeline (4). The pressure relief protection unit (32) is installed on the return oil protection pipeline (31) and is used to adjust the opening of the return oil protection pipeline (31).

2. The power system according to claim 1, characterized in that, The pressure relief protection unit (32) has a first working state of closing the return oil protection line (31) and a second working state of opening the return oil protection line (31).

3. The power system according to claim 1, characterized in that, The safety protection device (3) also includes: Locking protection unit (33) is disposed on the merging pipe (4). The locking protection unit (33) has a conducting state that connects the merging pipe (4) and a closing state that closes the merging pipe (4).

4. The power system according to claim 3, characterized in that, When the liquid flow direction in the confluence pipe (4) is from the steering hydraulic system (2) to the lifting hydraulic system (1), the locking protection unit (33) is in the conducting state, and / or, When the liquid flow direction in the merging pipeline (4) is from the lifting hydraulic system (1) to the steering hydraulic system (2), the locking protection unit (33) is in the closed state.

5. The power system according to claim 3, characterized in that, The safety protection device (3) also includes: The detection unit is used at least to detect the first pressure at the connection position between the steering hydraulic system (2) and the merging pipe (4), and the detection unit is used at least to detect the second pressure at the connection position between the lifting hydraulic system (1) and the merging pipe (4); The control unit is electrically connected to the detection unit, the pressure relief protection unit (32), and the locking protection unit (33).

6. The power system according to claim 5, characterized in that, The detection unit includes a first pressure detection element and a second pressure detection element. The first pressure detection element is located at the connection position between the steering hydraulic system (2) and the merging pipeline (4). The second pressure detection element is located at the connection position between the lifting hydraulic system (1) and the merging pipeline (4). Both the first pressure detection element and the second pressure detection element are electrically connected to the control unit.

7. The power system according to claim 3, characterized in that, The locking protection unit (33) includes a one-way valve, which is disposed on the confluence pipeline (4). The allowable flow direction of the one-way valve is from the steering hydraulic system (2) to the lifting hydraulic system (1).

8. The power system according to any one of claims 1-7, characterized in that, The pressure relief protection unit (32) includes an overflow valve. The outlet of the overflow valve is connected to the oil storage device (5) through the return oil protection pipeline (31), and the inlet of the overflow valve is connected to the confluence pipeline (4).

9. The power system according to any one of claims 1-7, characterized in that, The steering hydraulic system (2) includes at least a priority valve (21), and the lifting hydraulic system (1) includes at least a lifting main valve (11). The secondary oil outlet of the priority valve (21) is connected to the oil inlet of the lifting main valve (11) through the confluence pipeline (4).

10. The power system according to any one of claims 1-7, characterized in that, The return oil protection pipeline (31) is also equipped with a return oil filter (6).

11. The power system according to claim 3, characterized in that, The connection point between the return oil protection line (31) and the confluence line (4) is located close to the steering hydraulic system (2), and / or the locking protection unit (33) is located close to the lifting hydraulic system (1).

12. A steering and lifting system, characterized in that, Includes a power system, wherein the power system is any one of claims 1-11.

13. A vehicle, characterized in that, The vehicle includes the power system of any one of claims 1 to 11, or the vehicle includes the steering and lifting system of claim 12.

Images