Valve body assembly applied to lifting hydraulic system, lifting hydraulic system and vehicle

Abstract

The utility model provides a kind of valve body assembly applied to lifting hydraulic system, lifting hydraulic system and vehicle.The valve body assembly includes lifting main valve, and lifting main valve includes: valve core, the first interface of valve core is communicated with the pressure oil port P of lifting main valve by main oil circuit;Pilot oil circuit, the first end of pilot oil circuit is communicated with main oil circuit;The second end of pilot oil circuit is communicated with the first control end of valve core by first control oil circuit, first electric control valve is arranged on first control oil circuit, first electric control valve has the first default state of disconnecting first control oil circuit, and, the first working state of conducting first control oil circuit, when first control oil circuit is in first working state, valve core is in lifting state.The valve body assembly in the embodiment cancels conventional gas control mode, directly uses electric control liquid mode, can solve the problem that gas circuit is frozen under low temperature in relevant technology and leads to failure, enhances the reliability of system.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and more specifically, to a valve body assembly for a lifting hydraulic system, a lifting hydraulic system, and a vehicle. Background Technology

[0002] In related technologies, domestic mining trucks or wide-body vehicles mostly use electro-pneumatic or pneumatic-hydraulic methods to control the hydraulic circuit of the lifting hydraulic system. In low-temperature environments, the system's air circuit is prone to freezing, which can lead to control system failure and subsequent vehicle lifting system malfunction, preventing the vehicle lifting system from working properly. Utility Model Content

[0003] The main objective of this invention is to provide a valve body assembly, a lifting hydraulic system, and a vehicle for use in lifting hydraulic systems, in order to solve the problem of failure caused by icing of the air circuit at low temperatures in related technologies.

[0004] To achieve the above objectives, according to one aspect of the present invention, a valve body assembly for a lifting hydraulic system is provided. The valve body assembly includes a lifting main valve, which has a pressure port P, a return port T, and a working port A. The working port A of the lifting main valve is used to connect to a lifting cylinder. The pressure port P and the return port T of the lifting main valve are used to connect to an oil storage device. The lifting main valve includes: a valve core, the first interface of which is connected to the pressure port P of the lifting main valve through a main oil circuit, and a first relief valve is provided on the main oil circuit; a pilot oil circuit, the first end of which is connected to the main oil circuit, and the connection position between the pilot oil circuit and the main oil circuit is located between the pressure port P of the lifting main valve and the first relief valve; and a second end of the pilot oil circuit, which is connected to the first control end of the valve core through a first control oil circuit, and a first electrically controlled valve is provided on the first control oil circuit. The first electrically controlled valve has a first default state of disconnecting the first control oil circuit and a first working state of connecting the first control oil circuit. When the first control oil circuit is in the first working state, the valve core is in a lifting state.

[0005] Furthermore, the second end of the pilot oil circuit is also connected to the second control end of the valve core through the second control oil circuit. The second control oil circuit is equipped with a second solenoid valve. The second solenoid valve has a second default state of disconnecting the second control oil circuit and a second working state of connecting the second control oil circuit. When the second control oil circuit is in the second working state, the valve core is in the descending state.

[0006] Furthermore, the first solenoid valve is a solenoid valve. When the first solenoid valve is energized, it is in a first working state. When the first solenoid valve is de-energized, it is in a first default state. And / or, the second solenoid valve is a solenoid valve. When the second solenoid valve is energized, it is in a second working state. When the second solenoid valve is de-energized, it is in a second default state.

[0007] Furthermore, at least one of the first and second electrically controlled valves is a proportional solenoid valve.

[0008] Furthermore, the second interface of the valve core is connected to the return port T of the lifting main valve through the return oil circuit. The valve core has a neutral position. When the valve core is in the neutral position, the first interface of the valve core is connected to the second interface of the valve core. When the first solenoid valve is in the first default state and the second solenoid valve is in the second default state, the valve core is in the neutral position.

[0009] Furthermore, the lifting main valve also includes a neutral position control component, which has a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to the working port A of the lifting main valve through a first input oil circuit, the second input terminal is connected to the pilot oil circuit through a second input oil circuit, and the output terminal of the neutral position control component is connected to the third control terminal of the valve core through a neutral position control oil circuit. When the pressure value of either the first input terminal or the second input terminal is greater than a preset pressure value, the neutral position control component is in a conducting state, so as to connect the one of the first input terminal or the second input terminal with a pressure value greater than the preset pressure value to the output terminal of the neutral position control component. When the neutral position control component is in a conducting state, the valve core switches to the neutral position.

[0010] Furthermore, the intermediate position control component includes: a shuttle valve, the two input ends of which respectively form a first input end and a second input end; a second relief valve, the input end of which is connected to the output end of the shuttle valve, and the output end of the second relief valve forms the output end of the intermediate position control component; wherein, when the pressure of the working oil port A or the pressure value of the pilot oil circuit is greater than the preset pressure value of the second relief valve, the second relief valve is turned on, and the intermediate position control component is in the turned-on state.

[0011] Furthermore, a filter is installed in the pilot oil line, and / or a pressure reducing valve is installed in the pilot oil line.

[0012] Furthermore, the valve body assembly also includes: a limit valve, which is located on the first control oil line and between the first solenoid valve and the first control end of the valve core; the limit valve has a first connected state and a second connected state, when the limit valve is in the first connected state, the first control end of the valve core is connected to the first solenoid valve, and when the limit valve is in the second connected state, the first control end of the valve core is disconnected from the first solenoid valve.

[0013] According to another aspect of the present invention, a lifting hydraulic system is provided, the lifting hydraulic system including a valve body assembly, the valve body assembly being the aforementioned valve body assembly applied to the lifting hydraulic system.

[0014] According to another aspect of the present invention, a vehicle is provided, including a lifting hydraulic system, wherein the lifting hydraulic system is the lifting hydraulic system described above.

[0015] Applying the technical solution of this utility model, when the first solenoid valve is in the first working state, the oil pressure generated by the pilot oil circuit is transmitted to the first control end of the valve core through the first control oil circuit, causing the valve core to switch to the lifting state, thereby controlling the extension of the lifting cylinder and realizing the lifting of the cargo box. When the first solenoid valve is in the first default state, the first control oil circuit is disconnected, and the system does not perform lifting operations. The first solenoid valve is an solenoid valve, that is, the working state of the first solenoid valve can be adjusted by current control, realizing the solenoid control of the lifting hydraulic system. In this embodiment, the valve body assembly eliminates the traditional pneumatic control method. This design directly employs an electro-hydraulic control method, avoiding the risk of icing in the air circuit under low-temperature conditions, as is common in pneumatic control systems. This solves the problem of air circuit icing leading to failure at low temperatures in related technologies, enhancing system reliability. Furthermore, integrating the valve core, pilot oil circuit, and first electro-hydraulic valve within the lifting main valve reduces the number of external pipelines and connectors, simplifies the layout and assembly process of the entire valve body assembly, reduces system complexity and potential leakage risks, shortens the hydraulic signal transmission distance, reduces signal transmission delay, and thus improves the overall system's response speed and control accuracy to electrical signals. Attached Figure Description

[0016] 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:

[0017] Figure 1 A schematic diagram of an embodiment of a valve body assembly applied to a lifting hydraulic system according to the present invention is shown.

[0018] The above figures include the following reference numerals:

[0019] 1. First check valve; 2. First relief valve; 3. Second check valve; 4. Third check valve; 5. Filter; 6. Pressure reducing valve; 7. First solenoid valve; 8. Second solenoid valve; 9. Shuttle valve; 10. Second relief valve; 11. Valve core;

[0020] 20. Lifting main valve; 30. Lifting cylinder; 40. Oil reservoir; 50. Limit valve;

[0021] 61. Motor; 62. Lifting pump; 63. Return oil filter; 64. Pressure sensor. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figure 1 As shown in the specific embodiment of this application, a valve body assembly for use in a lifting hydraulic system is provided.

[0027] The valve body assembly includes a lifting main valve 20, which has a pressure port P, a return port T, and a working port A. The working port A of the lifting main valve 20 is used to connect to the lifting cylinder 30. The pressure port P and the return port T of the lifting main valve 20 are used to connect to the oil storage device 40. The lifting main valve 20 includes a valve core 11 and a pilot oil circuit. The first interface of the valve core 11 is connected to the pressure port P of the lifting main valve 20 through the main oil circuit. A first relief valve 2 is provided on the main oil circuit. The first end is connected to the main oil circuit. The connection position between the pilot oil circuit and the main oil circuit is located between the pressure port P of the lifting main valve 20 and the first relief valve 2. The second end of the pilot oil circuit is connected to the first control end of the valve core 11 through the first control oil circuit. The first control oil circuit is equipped with a first solenoid valve 7. The first solenoid valve 7 has a first default state of disconnecting the first control oil circuit and a first working state of connecting the first control oil circuit. When the first control oil circuit is in the first working state, the valve core 11 is in the lifting state.

[0028] Applying the technical solution of this embodiment, when the first solenoid valve 7 is in the first working state, the oil pressure generated by the pilot oil circuit is transmitted to the first control end of the valve core 11 through the first control oil circuit, causing the valve core 11 to switch to the lifting state, thereby controlling the extension of the lifting cylinder 30 and realizing the lifting of the cargo box. When the first solenoid valve 7 is in the first default state, the first control oil circuit is disconnected, and the system does not perform lifting operations at this time. The first solenoid valve 7 is an solenoid valve, that is, the working state of the first solenoid valve 7 can be adjusted by current control to realize the solenoid control of the lifting hydraulic system. In this embodiment, the valve body assembly eliminates the traditional pneumatic valve. The control method directly adopts an electro-hydraulic control method, which avoids the risk of air circuit freezing in low-temperature environments in pneumatic control methods, solves the problem of air circuit freezing at low temperatures leading to failure in related technologies, and enhances the reliability of the system. In addition, the valve core 11, pilot oil circuit and first solenoid valve 7 are integrated inside the lifting main valve 20, which reduces the number of external pipelines and connectors, simplifies the layout and assembly process of the entire valve body assembly, reduces system complexity and potential leakage risk, shortens the distance of hydraulic signal transmission, reduces signal transmission delay, and thus improves the response speed and control accuracy of the entire system to electrical signals.

[0029] It should be understood that in this embodiment, the first relief valve 2 is used to open when the pressure is greater than the preset value. When the oil enters the main oil circuit through the pressure port P, it needs to wait for the pressure in the main oil circuit to reach the predetermined value before it can enter the valve core 11 through the first relief valve 2. That is, the oil in the main oil circuit needs a pressure building time before it can enter the valve core 11. During this pressure building time, the pilot oil circuit can guide the oil in the main oil circuit to the first solenoid valve 7. After the first solenoid valve 7 switches to the first working state, the oil can enter the first control oil circuit and then reach the first control end of the valve core 11 to adjust the valve core 11 to the lifting state, so that the valve core 11 switches to the lifting state before it is connected to the main oil circuit, thus realizing the lifting preparation.

[0030] In other embodiments, the oil pressure output can be changed by adjusting the control current of the first solenoid valve 7, thereby adjusting the opening of the valve core 11 and achieving precise control of the cargo box lifting speed.

[0031] It should be noted that, as Figure 1 As shown, in this embodiment, the second port of the valve core 11 is connected to the return port T of the lifting main valve 20 through the return oil passage, and the third port of the valve core 11 is connected to the working port A of the lifting main valve 20 through the working oil passage. The valve core 11 has a lifting state and a lowering state. When the valve core 11 is in the lifting state, the first port of the valve core 11 is connected to the third port of the valve core 11. When the valve core 11 is in the lowering state, the second port of the valve core 11 is connected to the third port of the valve core 11.

[0032] In one exemplary embodiment of this application, the valve core 11 is a three-position three-way valve. Optionally, depending on actual needs, the valve core 11 can be a valve structure with more interfaces and position states, such as a three-position four-way valve, in which the extra interfaces can be blocked and only the required position state can be applied.

[0033] Furthermore, the second end of the pilot oil circuit is also connected to the second control end of the valve core 11 through the second control oil circuit. The second control oil circuit is provided with a second solenoid valve 8. The second solenoid valve 8 has a second default state of disconnecting the second control oil circuit and a second working state of connecting the second control oil circuit. When the second control oil circuit is in the second working state, the valve core 11 is in the descending state.

[0034] In this embodiment, when the second solenoid valve 8 is in the second working state, the oil pressure generated by the pilot oil circuit is transmitted to the second control end of the valve core 11 through the second control oil circuit, causing the valve core 11 to switch to the lowering state, thereby controlling the shortening of the lifting cylinder 30 and realizing the lowering of the cargo box. The second solenoid valve 8 is an solenoid valve, and its state switching can be achieved through current control, that is, realizing the solenoid operation of the cargo box lowering, further improving the flexibility and safety of the system. Integrating the second control oil circuit and the second solenoid valve 8 into the lifting main valve 20 can reduce the number of external pipelines and connectors, reduce signal transmission delay, simplify the layout and assembly process of the entire valve body assembly, reduce system complexity and potential leakage risk, and improve the system's response speed and control accuracy to electrical signals.

[0035] In other embodiments, the oil pressure output can be changed by adjusting the control current of the second solenoid valve 8, thereby adjusting the opening of the valve core 11 and achieving precise control of the cargo box descent speed.

[0036] Specifically, the first solenoid valve 7 is a solenoid valve. When the first solenoid valve 7 is energized, it is in a first working state. When the first solenoid valve 7 is de-energized, it is in a first default state.

[0037] In this embodiment, the first solenoid valve 7 is controlled by an electrical signal. When energized, it opens the oil circuit, and when de-energized, it closes the oil circuit. This ensures precise control of the oil pressure, so that the lifting hydraulic system only operates the first solenoid valve 7 to energize when there is a need for lifting, and then enters the lifting operation. When there is no need for lifting operation, the first solenoid valve 7 closes the first control oil circuit to avoid interfering with the other operations of the system.

[0038] Specifically, the second solenoid valve 8 is a solenoid valve. When the second solenoid valve 8 is energized, it is in the second working state. When the second solenoid valve 8 is de-energized, it is in the second default state.

[0039] In this embodiment, the second solenoid valve 8 is controlled by an electrical signal. When energized, it opens the oil circuit, and when de-energized, it closes the oil circuit. This ensures precise control of the oil pressure, so that the lifting hydraulic system only operates the second solenoid valve 8 to energize when there is a need for descent, and then enters the descent operation. When descent is not required, the second solenoid valve 8 closes the second control oil circuit to avoid interfering with the rest of the system's operation.

[0040] Furthermore, at least one of the first solenoid valve 7 and the second solenoid valve 8 is a proportional solenoid valve.

[0041] The use of proportional solenoid valves enables the system to achieve proportional control, that is, to adjust the opening of the oil circuit according to the magnitude of the input signal, thereby controlling the oil pressure. The first solenoid valve 7 uses a proportional solenoid valve to achieve precise control of the lifting action, and the second solenoid valve 8 uses a proportional solenoid valve to achieve precise control of the lowering action. In other words, the proportional solenoid valves can adjust the speed of lifting and lowering of the cargo box, improving the smoothness and efficiency of operation.

[0042] Preferably, both the first solenoid valve 7 and the second solenoid valve 8 are proportional solenoid valves, which can take into account the speed adjustment of both lifting and lowering actions, making the lifting system operate more accurately and smoothly.

[0043] In other embodiments, the first solenoid valve 7 and the second solenoid valve 8 can also be on / off type solenoid valves, with only two states: open and closed, which can be used for simple on / off control. Alternatively, the first solenoid valve 7 and the second solenoid valve 8 can also be solenoid valve structures with high precision and fast response characteristics, such as servo valves.

[0044] Furthermore, the second interface of the valve core 11 is connected to the return port T of the lifting main valve 20 through the return oil circuit. The valve core 11 has a neutral position. When the valve core 11 is in the neutral position, the first interface of the valve core 11 is connected to the second interface of the valve core 11. When the first solenoid valve 7 is in the first default state and the second solenoid valve 8 is in the second default state, the valve core 11 is in the neutral position.

[0045] In this embodiment, the neutral position setting ensures the stability of the system when there are no lifting or lowering commands, preventing misoperation. When both the first solenoid valve 7 and the second solenoid valve 8 are in the default closed state, the valve core 11 is in the neutral position, cutting off the connection between the lifting cylinder 30 and the main oil circuit and the return oil circuit, maintaining the current state of the cylinder, effectively preventing the cargo box from moving unexpectedly without commands, and increasing the safety of the system.

[0046] In other embodiments, the stability and security of the neutral state can be further enhanced by providing a mechanical locking mechanism.

[0047] Furthermore, the lifting main valve 20 also includes a neutral position control component. The neutral position control component has a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to the working port A of the lifting main valve 20 through a first input oil circuit, the second input terminal is connected to the pilot oil circuit through a second input oil circuit, and the output terminal of the neutral position control component is connected to the third control terminal of the valve core 11 through a neutral position control oil circuit. When the pressure value of either the first input terminal or the second input terminal is greater than a preset pressure value, the neutral position control component is in a conducting state, so as to connect the one of the first input terminal or the second input terminal with a pressure value greater than the preset pressure value to the output terminal of the neutral position control component. When the neutral position control component is in a conducting state, the valve core 11 switches to the neutral position.

[0048] In this embodiment, the neutral position control component monitors the pressure at the working port A and the pilot oil circuit. When the pressure exceeds a preset value, the neutral position control component automatically activates, switching valve core 11 to the neutral position, cutting off the oil circuit, and protecting the system from damage. The introduction of the neutral position control component enables the system to automatically enter the neutral position when abnormal pressure is detected, effectively responding to emergencies, avoiding system failures caused by excessive pressure, increasing the system's self-protection capability, and improving the system's reliability and service life.

[0049] In other embodiments, adding pressure sensors and electronic control units can enable more intelligent mid-state switching and improve the system's response speed.

[0050] Specifically, the intermediate position control component includes a shuttle valve 9, with its two input ends forming a first input end and a second input end, respectively; and a second relief valve 10, with its input end connected to the output end of the shuttle valve 9, and its output end forming the output end of the intermediate position control component; wherein, when the pressure at the working port A or the pressure in the pilot oil circuit is greater than the preset pressure value of the second relief valve 10, the second relief valve 10 is turned on, and the intermediate position control component is in the on state.

[0051] In this embodiment, shuttle valve 9 is used to compare the pressures at two input terminals (i.e., the first input terminal and the second input terminal). The oil circuit with the higher pressure is connected to the input terminal of the second relief valve 10. When the pressure exceeds the preset value of the second relief valve 10, the relief valve opens, releasing the oil pressure, and simultaneously switching the valve core 11 to the neutral position. The combination of shuttle valve 9 and the second relief valve 10 in this embodiment can respond promptly, avoiding system failures caused by excessive oil pressure, achieving effective monitoring and management of system pressure, and ensuring the long-term stable operation of the system.

[0052] In other embodiments, the pressure control requirements under different load conditions can be adapted by adjusting the preset pressure value of the second relief valve 10.

[0053] It should be understood that, depending on actual needs, the neutral position control component can also be any other structure capable of achieving the same function. For example, the neutral position control component may include a dual-way solenoid valve with two input terminals and one output terminal. One input terminal is connected to the working port A of the lifting main valve 20, and the other input terminal is connected to the pilot oil circuit. The dual-way solenoid valve has an internal pressure sensing mechanism that can sense pressure changes at the input terminals. When the pressure at either input terminal exceeds a preset threshold, the solenoid valve automatically opens under the action of the internal sensing mechanism, allowing the terminal with higher pressure to connect to the output terminal, thereby transmitting the higher pressure to the third control terminal of the valve core 11. This pressure control mechanism ensures that when the pressure in any path of the system increases abnormally, it can promptly act on the third control terminal, prompting the valve core 11 to quickly switch to the neutral position, cutting off the oil circuit between the cylinder and the pump, preventing abnormal movement of the cargo box, and ensuring the safety of the system.

[0054] Preferably, a filter 5 is installed in the pilot oil circuit. The filter 5 can remove impurities from the oil, improve the cleanliness of the hydraulic system, extend the service life of hydraulic components, reduce maintenance costs, and ensure the normal operation of the system.

[0055] Preferably, a pressure reducing valve 6 is installed in the pilot oil circuit. The pressure reducing valve 6 can reduce the oil pressure to the required working pressure range of the system, improve the stability of the hydraulic system, extend the service life of hydraulic components, reduce maintenance costs, and ensure the normal operation of the system.

[0056] Furthermore, the valve body assembly also includes a limit valve 50, which is located in the first control oil circuit and between the first solenoid valve 7 and the first control end of the valve core 11. The limit valve 50 has a first connected state and a second connected state. When the limit valve 50 is in the first connected state, the first control end of the valve core 11 is connected to the first solenoid valve 7. When the limit valve 50 is in the second connected state, the first control end of the valve core 11 is disconnected from the first solenoid valve 7.

[0057] In this embodiment, when the cargo box is raised to a preset angle, the limit valve 50 switches to the second connected state, cuts off the first control oil circuit, forces the valve core 11 back to the neutral position, and stops the lifting of the cargo box. The limit valve 50 can achieve precise control of the cargo box lifting angle, effectively prevent the cargo box from being over-lifted, and reduce the safety hazards caused by excessive angle.

[0058] In one exemplary embodiment of this application, the limit valve 50 can be combined with a proximity sensor, proximity switch, etc. When the proximity sensor detects that the cargo box is approaching a preset maximum position, it sends a signal to change the connection state of the limit valve 50. The proximity sensor is installed on the top of the cargo box or at a preset position on the lifting mechanism to monitor the degree of proximity between the cargo box and the preset position in real time. Alternatively, the limit valve 50 can be configured as an electronically controlled structure, connected to the vehicle's main control system, and changes its connection state by receiving electronic signals.

[0059] In other embodiments, other sensors can be used to detect the lifting operation, thereby achieving more precise angle detection and improving the accuracy of limit control.

[0060] According to another specific embodiment of this application, a lifting hydraulic system is provided, the lifting hydraulic system including a valve body assembly, the valve body assembly being the valve body assembly applied to the lifting hydraulic system in the above embodiment.

[0061] The lifting hydraulic system in this embodiment integrates the aforementioned valve body components, eliminating the pneumatic control method and adopting an electro-hydraulic system, thus improving the system's reliability and safety. Specifically, through precise control of the electro-hydraulic valves, accurate lifting and lowering of the cargo box is achieved. Simultaneously, the cooperation of limit valves ensures stable system operation. This lifting hydraulic system not only effectively prevents the risk of air circuit icing in low-temperature environments but also monitors the oil pressure within the cylinders in real time, ensuring the safety of the cargo box when lifted to the top.

[0062] This application also provides a preferred embodiment of a lifting hydraulic system, which is mainly used in unmanned mining trucks.

[0063] Specifically, the lifting hydraulic system includes the following components:

[0064] The hydraulic oil tank (i.e., the aforementioned oil storage device 40) is used to store hydraulic oil; the lifting pump 62 is used to convert low-pressure hydraulic oil into high-pressure hydraulic oil.

[0065] The lifting main valve 20 controls the flow of hydraulic oil. First check valve 1, second check valve 3, and third check valve 4 allow hydraulic oil to flow through in only one direction. First relief valve 2 allows high-pressure oil to flow out when the pressure exceeds a specific value; here, the relief valve establishes pilot control oil pressure. Filter 5 filters the hydraulic oil to prevent impurities from entering the downstream oil circuit. Pressure reducing valve 6 reduces the high-pressure oil pressure to a set value. The lifting proportional solenoid valve (i.e., the aforementioned first solenoid valve 7) controls the lifting action; it is controlled by low-voltage electricity, with different control currents outputting different oil pressures, thus controlling the lifting main valve 20. The valve core 11 has different opening degrees; the lowering proportional solenoid valve (i.e., the aforementioned second solenoid valve 8) is used to control the lowering action. It is controlled by low-voltage electricity, and different control currents output different oil pressures, which can realize different opening degrees of the valve core 11 of the lifting main valve 20; the shuttle valve 9 is used to compare the oil pressures of the two inlet hydraulic oils and output the hydraulic oil with the higher oil pressure; the second relief valve 10 opens when the system hydraulic pressure is greater than a certain value, allowing the hydraulic oil to drain and protecting the system; the three-position three-way valve core (i.e., the aforementioned valve core 11) can switch between three different positions to realize the extension, holding, and retraction of the cylinder, thereby realizing the raising, holding, and lowering of the cargo box, such as... Figure 1 As shown, the left side is the rising position, the middle position is the holding position, and the right side is the falling position.

[0066] Pressure sensor 64 is used to measure the pressure of hydraulic oil; lifting cylinder 30 is a hydraulic component used to extend or retract; limit valve 50 is used to switch the valve core of limit valve 50 to stop lifting when the cargo box is lifted to a certain angle; return oil filter 63 is used to filter hydraulic oil in the return oil line.

[0067] In this embodiment, the valve assembly operates as follows under different movements of the cargo box:

[0068] The cargo box does not lift or lower, while the motor 61 drives the lifting pump 62 to rotate: the hydraulic oil flows back to the oil tank through the first check valve 1, the first relief valve 2, the second check valve 3 and the T port of the valve core 11.

[0069] Cargo box lifting: The VCU (Vehicle Control Unit) controls the first electronic control valve 7 to be energized, and the upper and lower oil circuits of the first electronic control valve 7 are connected. After the pump rotates, the pressure is increased to a certain value under the action of the first relief valve 2. The low-pressure oil produced by the pump passes through the first one-way valve 1, filter 5 and pressure reducing valve 6 to become pilot control oil, and then passes through the first electronic control valve 7, port K1, port P and port A of limit valve 50, and port K2. It acts on the left side of valve core 11. The left side position of valve core (i.e. the rising position) is active, and hydraulic oil enters the lifting cylinder 30. The oil pressure continues to rise, causing the cylinder to extend and realize the cargo box lifting function.

[0070] When the pressure at port A or the pilot oil pressure is greater than the set value of the second relief valve 10 during the lifting process, the hydraulic oil enters the plunger on the right side of the valve core 11 through the shuttle valve 9 and the second relief valve 10, pushing the valve core into the neutral holding position. The plunger stroke only allows the valve core 11 to enter the neutral holding position and will not allow the valve core 11 to enter the right lowering position.

[0071] When the cargo box is raised to a certain angle, the limit valve 50 is triggered. After the cargo box pushes the limit valve 50 to switch positions, the pilot hydraulic oil acting on the left side of the valve core 11 flows back to the oil tank through port K2, port A and port T of the limit valve. Under the action of the spring force on the right side, the valve core 11 returns to the neutral position, so that the hydraulic oil produced by the pump flows back to the oil tank through the first check valve 1, the first relief valve 2, the second check valve 3 and port T.

[0072] It should be noted that the system can also be set up with an unlimited valve, that is, the K1 port and the K2 port are directly connected, which is also feasible. Other methods can be used to determine that the cargo box has been lifted to a certain angle, such as using a proximity switch.

[0073] Among them, the first electronically controlled valve 7 can be a proportional solenoid valve, which controls the output oil pressure to control the opening degree of the valve core 11 on the left, thereby realizing the control of the lifting speed of the cargo box.

[0074] Cargo box descent: The VCU controls the second solenoid valve 8 to be energized, and the upper and lower oil circuits of the second solenoid valve 8 are connected. After the pump rotates, the pressure is increased to a certain value under the action of the first relief valve 2. The low-pressure oil produced by the pump passes through the first check valve 1, filter 5 and pressure reducing valve 6 to become pilot control oil, and then passes through the second solenoid valve 8, acting on the right side of the valve core 11. The right side position of the valve core (i.e. the descent position) is activated, and the lifting cylinder 30 is shortened under the action of the cargo box's gravity. The hydraulic oil in the lifting cylinder 30 flows back to the oil tank through the right position of the valve core 11 and the T port, realizing the shortening of the cylinder and the descent of the cargo box.

[0075] The second electronically controlled valve 8 can be a proportional solenoid valve, which controls the output oil pressure to control the opening degree of the valve core 11 in the right position, thereby realizing the control of the cargo box descent speed.

[0076] The lifting hydraulic system in this embodiment adopts an electro-hydraulic method to realize the proportional lifting and lowering of the cargo box. It also has the function of detecting when the cargo box is lifted to the top and monitoring the hydraulic oil pressure in the cylinder, making the vehicle (such as an unmanned mining truck) safer.

[0077] According to another specific embodiment of this application, a vehicle is provided, including a lifting hydraulic system, which is the lifting hydraulic system in the above embodiment.

[0078] In this embodiment, the vehicle integrates the aforementioned lifting hydraulic system to achieve safe lifting and lowering of the cargo box. Specifically, the vehicle's control system and the electronic control components in the lifting hydraulic system can work together to achieve precise control over the lifting and lowering of the cargo box.

[0079] In other embodiments, the vehicle's ability to operate in complex environments can be further enhanced by adding other auxiliary systems, such as positioning systems and obstacle detection systems.

[0080] Optionally, the vehicle is an unmanned vehicle. By applying the lifting hydraulic system in the above embodiments, the unmanned vehicle can safely and efficiently complete cargo loading and unloading tasks in unmanned mode, significantly improving the automation level and safety of mining operations.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 valve body assembly used in a lifting hydraulic system, characterized in that, The valve body assembly includes a lifting main valve (20), which has a pressure port P, a return port T, and a working port A. The working port A of the lifting main valve (20) is used to connect to the lifting cylinder (30). The pressure port P and the return port T of the lifting main valve (20) are used to connect to the oil storage device (40). The lifting main valve (20) includes: Valve core (11), the first interface of the valve core (11) is connected to the pressure port P of the lifting main valve (20) through the main oil circuit, and a first relief valve (2) is provided on the main oil circuit; Pilot oil circuit, the first end of the pilot oil circuit is connected to the main oil circuit, and the connection position between the pilot oil circuit and the main oil circuit is located between the pressure port P of the lifting main valve (20) and the first relief valve (2); The second end of the pilot oil circuit is connected to the first control end of the valve core (11) through the first control oil circuit. The first control oil circuit is provided with a first solenoid valve (7). The first solenoid valve (7) has a first default state of disconnecting the first control oil circuit and a first working state of connecting the first control oil circuit. When the first control oil circuit is in the first working state, the valve core (11) is in the lifting state.

2. The valve body assembly for a lifting hydraulic system according to claim 1, characterized in that, The second end of the pilot oil circuit is also connected to the second control end of the valve core (11) through the second control oil circuit. The second control oil circuit is provided with a second solenoid valve (8). The second solenoid valve (8) has a second default state of disconnecting the second control oil circuit and a second working state of connecting the second control oil circuit. When the second control oil circuit is in the second working state, the valve core (11) is in a descending state.

3. The valve body assembly for a lifting hydraulic system according to claim 2, characterized in that, The first solenoid valve (7) is a solenoid valve. When the first solenoid valve (7) is energized, it is in the first working state. When the first solenoid valve (7) is de-energized, it is in the first default state. And / or, the second solenoid valve (8) is a solenoid valve. When the second solenoid valve (8) is energized, it is in the second working state. When the second solenoid valve (8) is de-energized, it is in the second default state.

4. The valve body assembly for a lifting hydraulic system according to claim 3, characterized in that, At least one of the first solenoid valve (7) and the second solenoid valve (8) is a proportional solenoid valve.

5. The valve body assembly for a lifting hydraulic system according to claim 2, characterized in that, The second interface of the valve core (11) is connected to the return port T of the lifting main valve (20) through the return oil circuit. The valve core (11) has a neutral position. When the valve core (11) is in the neutral position, the first interface of the valve core (11) is connected to the second interface of the valve core (11). When the first solenoid valve (7) is in the first default state and the second solenoid valve (8) is in the second default state, the valve core (11) is in the neutral position.

6. The valve body assembly for a lifting hydraulic system according to claim 5, characterized in that, The lifting main valve (20) also includes: The mid-position control component has a first input terminal, a second input terminal and an output terminal. The first input terminal is connected to the working port A of the lifting main valve (20) through a first input oil circuit. The second input terminal is connected to the pilot oil circuit through a second input oil circuit. The output terminal of the mid-position control component is connected to the third control terminal of the valve core (11) through a mid-position control oil circuit. When the pressure value of either the first input terminal or the second input terminal is greater than the preset pressure value, the mid-position control component is in the conducting state, so as to connect the one of the first input terminal or the second input terminal that is greater than the preset pressure value to the output terminal of the mid-position control component. When the mid-position control component is in the conducting state, the valve core (11) is switched to the mid-position state.

7. The valve body assembly for a lifting hydraulic system according to claim 6, characterized in that, The mid-position control component includes: A shuttle valve (9), wherein the two input ends of the shuttle valve (9) are respectively formed as the first input end and the second input end; The second overflow valve (10) has its input end connected to the output end of the shuttle valve (9), and its output end forms the output end of the mid-position control component. When the pressure of the working oil port A or the pressure of the pilot oil circuit is greater than the preset pressure value of the second relief valve (10), the second relief valve (10) is turned on, and the mid-position control component is in the turned-on state.

8. The valve body assembly for a lifting hydraulic system according to claim 1, characterized in that, A filter (5) is provided on the pilot oil line, and / or a pressure reducing valve (6) is provided on the pilot oil line.

9. The valve body assembly for a lifting hydraulic system according to any one of claims 1-8, characterized in that, The valve body assembly also includes: Limit valve (50), the limit valve (50) is located in the first control oil circuit, the limit valve (50) is located between the first solenoid valve (7) and the first control end of the valve core (11); The limit valve (50) has a first connected state and a second connected state. When the limit valve (50) is in the first connected state, the first control end of the valve core (11) is connected to the first solenoid valve (7). When the limit valve (50) is in the second connected state, the first control end of the valve core (11) is disconnected from the first solenoid valve (7).

10. A lifting hydraulic system, characterized in that, The lifting hydraulic system includes a valve body assembly, which is the valve body assembly used in the lifting hydraulic system according to any one of claims 1-9.

11. A vehicle, characterized in that, Includes a lifting hydraulic system, wherein the lifting hydraulic system is the lifting hydraulic system as described in claim 10.

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