Container lifting system and dumper
By combining the first control valve and limit valve in the cargo box lifting system and using a monitoring module to monitor the position of the second valve core, the problem of the cargo box lifting angle being unmonitored is solved, achieving precise cargo box lifting control and improving vehicle operating efficiency and stability.
Patent Information
- Application Number
- CN202520171477.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-01-24
AI Technical Summary
In existing cargo box lifting control systems, the lifting angle of the cargo box cannot be monitored, which can easily lead to over-lifting and affect the normal operation of the vehicle.
The cargo box lifting system uses a combination of a first control valve and a limit valve, and a monitoring module to monitor the working position of the second valve core to achieve precise control of the cargo box lifting angle and avoid over-lifting.
It enables precise monitoring of the cargo box lifting angle, avoids over-lifting, improves vehicle operating efficiency and stability, simplifies structural design, and improves assembly efficiency.
Smart Images
Figure CN223864752U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of dump truck control, and in particular to a cargo box lifting system and a dump truck. BACKGROUND
[0002] With the continuous improvement of the automation and intelligence level of mines, unmanned trucks are increasingly widely used in mine operations. Such vehicles, by integrating advanced sensors, control systems and actuators, achieve efficient unmanned operation, significantly improving the efficiency and safety of mine exploitation. Among the various functions of unmanned trucks, the lifting and unloading of the cargo box is a crucial link, directly related to the efficiency and stability of the vehicle.
[0003] The existing cargo box lifting control is based on time. During the lifting of the cargo box, after the cargo box triggers the upper stop point switch, it will be continuously lifted, and the lifting angle will continue to increase with time until the lifting stops after five seconds to ensure that the materials in the cargo box are completely unloaded. However, during the process of continuously lifting the cargo box after triggering the upper stop point switch, the lifting angle of the cargo box cannot be monitored, which may cause the cargo box to be lifted excessively, thereby triggering the limit protection valve and affecting the normal operation of the vehicle. CONTENT OF THE INVENTION
[0004] Therefore, an embodiment of the present application provides a cargo box lifting system and a dump truck to solve the problem that the lifting angle of the cargo box cannot be monitored, which may cause the cargo box to be lifted excessively and affect the normal operation of the vehicle.
[0005] In a first aspect, an embodiment of the present application provides a cargo box lifting system, comprising: a first control valve in communication with a first working medium source, for controlling the on-off and flow direction of the first working medium, the first control valve comprising a first valve core and having a first valve core control interface; at least one power cylinder in communication with the first control valve, so that the first working medium can enter the power cylinder, the power cylinder being used for lifting the cargo box; a limit valve arranged in a connection passage between the second working medium source and the first valve core control interface, the limit valve comprising a second valve core, the second valve core having a first working position and a second working position; a monitoring module configured to monitor the working position of the second valve core; wherein, in the case that the second valve core is located at the first working position, the second working medium source is in communication with the first valve core control interface, and the second working medium enters the first valve core control interface to change the working position of the first valve core; in the case that the second valve core is located at the second working position, the second valve core cuts off the passage of the second working medium from the second working medium source to the first valve core control interface; in the case that the cargo box is lifted to a preset angle, the second valve core moves from the first working position to the second working position, and the power cylinder stops lifting.
[0006] In some implementations of the first aspect, the connection passage between the limit valve and the first valve core control interface is a first passage; the limit valve has a flow outlet, the first valve core control interface is in communication with the flow outlet when the second valve core is in the second working position, and at least part of the second working medium in the first passage flows out of the first passage through the flow outlet; the monitoring module includes a first pressure detection element disposed in the first passage, configured to detect first pressure data of the second working medium in the first passage and send the first pressure data; the control module is in communication connection with the first pressure detection element and is configured to receive the first pressure data, determine that the second valve core is in the first working position when the first pressure data is greater than a first preset value, and determine that the second valve core is in the second working position when the first pressure data is less than a second preset value.
[0007] In some implementations of the first aspect, the connection passage between the second working medium source and the limit valve is a second passage; the monitoring module further includes a second pressure detection element disposed in the second passage, configured to detect second pressure data of the second working medium in the second passage, the second pressure detection element is in communication connection with the control module and sends the second pressure data; the control module is further configured to receive the second pressure data, determine that the second valve core is in the first working position when both the first pressure data and the second pressure data are greater than the first preset value, and determine that the second valve core is in the second working position when the first pressure data is less than the second preset value and the second pressure data is greater than the first preset value.
[0008] In some implementations of the first aspect, the control module is further configured to first determine that the limit valve is faulty when the power cylinder needs to perform a lifting action, the value of the first pressure data is zero, the value of the second pressure data is not zero, and the power cylinder has no lifting action.
[0009] In some implementations of the first aspect, the cargo box lifting system further includes a second control valve disposed in the connection passage between the second working medium source and the limit valve, configured to control the on-off and flow direction of the second working medium, the second control valve includes a third valve core having a third working position and a fourth working position; a valve core control module in communication connection with the control module, configured to control the working position of the third valve core; when the third valve core is in the third working position, the second working medium source is in communication with the limit valve, and the second working medium flows into the limit valve through the second control valve; when the third valve core is in the fourth working position, the second working medium source is not in communication with the limit valve; when the control module determines that the second valve core is in the second working position, the control module sends a first control instruction to the valve core control module, and the valve core control module controls the third valve core to move to the fourth working position.
[0010] In some implementations of the first aspect, the first control valve further has a second spool control interface; the second control valve is in communication with the second spool control interface; the third spool further has a fifth working position, when the third spool is in the fifth working position, the second working medium source is in communication with the second spool control interface, and the second working medium flows from the second working medium source into the second spool control interface to change the position of the first spool; and when the power cylinder needs to perform the dump box action, the control module sends a third control instruction to the spool control module, and the spool control module controls the third spool to move to the fifth working position.
[0011] In some implementations of the first aspect, the dump box lifting system further comprises a quick exhaust valve arranged in the first passage, the quick exhaust valve comprising a first inlet and outlet, a second inlet and outlet, and a discharge port, the first inlet and outlet being in communication with the limit valve, the second inlet and outlet being in communication with the first spool control interface, and the discharge port being in communication with the second working medium source or the outside.
[0012] In some implementations of the first aspect, the dump box lifting system further comprises a first working medium conveying device in communication with the first working medium source and configured to convey the first working medium, and / or a second working medium conveying device in communication with the second working medium source and configured to convey the second working medium.
[0013] In some implementations of the first aspect, the first working medium is a liquid, and / or the second working medium is a gas.
[0014] In a second aspect, an embodiment of the present application provides a dump truck, comprising: a vehicle frame; a dump box arranged on the vehicle frame and rotatably connected to the vehicle frame about a rotation axis; and the dump box lifting system according to any one of the first aspect.
[0015] The dump box lifting system provided by the embodiment can control the process of lifting the dump box by the power cylinder through the first control valve, control the working position of the first spool of the first control valve through the limit valve, and when the dump box is lifted to a preset angle, the second spool of the limit valve is moved from the first working position to the second working position, and the power cylinder stops lifting, so that the change of the working position of the second spool is monitored through the monitoring module, thereby monitoring the lifting angle of the dump box and avoiding excessive lifting of the dump box to affect the normal operation of the vehicle.
[0016] In addition, the system does not need to use the top dead center switch in the prior art to determine whether the dump box is lifted in place, and the structure is simpler, easier to debug, and improves the assembly efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0017] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.
[0018] Figure 1 The diagram shown is a structural schematic of a cargo box lifting system provided in an embodiment of this application.
[0019] Figure 2 The diagram shown is a schematic representation of the workflow of a control module provided in an embodiment of this application.
[0020] Figure 3 The diagram shown is a schematic diagram of the workflow of a control module provided in another embodiment of this application.
[0021] Figure 4 The diagram shown is a schematic diagram of the workflow of the control module provided in another embodiment of this application.
[0022] Figure 5 The diagram shown is a structural schematic of a dump truck provided in an embodiment of this application.
[0023] Figure label:
[0024] 1. Dump truck; 10. Cargo box lifting system; 11. First control valve; 12. First working medium source; 13. Power cylinder; 14. Limit valve; 15. Monitoring module; 150. First pressure detection element; 151. Control module; 152. Second pressure detection element; 16. First passage; 17. Second passage; 18. Second control valve; 19. Second working medium source; 20. Quick exhaust valve; 21. First working medium conveying device; 22. Filter; 23. Overflow valve; 30. Chassis; 31. Cargo box. Detailed Implementation
[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0026] Figure 1 The diagram shown is a structural schematic of a cargo box lifting system provided in one embodiment of this application. Figure 1 As shown, the cargo box lifting system 10 includes: a first control valve 11, at least one power cylinder 13, a limit valve 14, and a monitoring module 15.
[0027] A first control valve 11 is connected to a first working medium source 12 and is used to control the on / off state and flow direction of the first working medium. The first control valve 11 includes a first valve core and has a first valve core control interface. At least one power cylinder 13 is connected to the first control valve 11 to allow the first working medium to enter the power cylinder 13. The power cylinder 13 is used to lift the cargo box 31. A limit valve 14 is disposed in the connection passage between the second working medium source 19 and the first valve core control interface. The limit valve 14 includes a second valve core, which has a first working position and a second working position. A monitoring module 15 is configured to monitor the working position of the second valve core.
[0028] When the second valve core is in the first working position, the second working medium source 19 is connected to the first valve core control interface, and the second working medium enters the first valve core control interface to change the working position of the first valve core. When the second valve core is in the second working position, the second valve core cuts off the flow of the second working medium from the second working medium source 19 to the first valve core control interface.
[0029] When the cargo box 31 is lifted to a preset angle, the second valve core moves from the first working position to the second working position, and the power cylinder 13 stops lifting.
[0030] Specifically, the cargo box lifting system 10 is used to lift the cargo box 31. During the lifting process, the lifting angle of the cargo box 31 gradually increases. Exemplarily, the cargo box 31 can be a container in a vehicle used for loading goods or materials, and may also be referred to as a truck bed. The vehicle may include mining trucks, freight trucks, etc. The cargo box 31 can be used to load ore, earthwork, etc. Specifically, the first working medium source 12 can be used to provide a first working medium. Exemplarily, the first working medium can be a gas or a liquid. For example, the first working medium can be a liquid. Further, the first working medium can be hydraulic oil or an emulsion.
[0031] Specifically, the first control valve 11, as a control element, is used to control whether the first working medium flows through the connection passage and in which connection passage it flows, i.e., the flow direction of the first working medium. The first control valve 11 is connected to the first working medium source 12 through the connection passage. The power cylinder 13 is used to convert the pressure of the first working medium into mechanical energy, thereby lifting the cargo box 31. Exemplarily, the cargo box lifting system 10 may include multiple power cylinders 13, which together achieve the lifting of the cargo box 31. Exemplarily, when the first working medium is a liquid, the first control valve 11 may be a hydraulic valve, and the power cylinder 13 may be a hydraulic cylinder. When the first working medium is a gas, the first control valve 11 may be a pneumatic control valve, and the power cylinder 13 may be a pneumatic cylinder.
[0032] Specifically, the second working medium source 19 can be used to provide a second working medium. Exemplarily, the second working medium can be a gas or a liquid. For example, the second working medium can be a gas. Further, the second working medium can be air. The limit valve 14, as a control element, is used to control the on / off state and flow direction of the second working medium in the connection passage between the second working medium source 19 and the first valve core control interface. Exemplarily, when the second working medium is a liquid, the limit valve 14 can be a hydraulic valve, and the first valve core control interface can supply liquid flow. When the second working medium is a gas, the limit valve 14 can be a pneumatic control valve, and the first valve core control interface can supply gas flow.
[0033] In some application scenarios, to unload materials from container 31, container 31 needs to be lifted to tilt it, allowing the materials to slide or tip from the tilted container 31 to the target location. To ensure all materials are unloaded from container 31, it needs to be tilted to a certain degree, meaning it needs to be lifted to a certain angle. Specifically, to ensure all materials are unloaded from container 31, it needs to be lifted to a preset angle. The preset angle can be set based on one or more factors such as material weight, material volume, material moisture content, container 31 dimensions, container 31 shape, container 31 material, and container 31 structure. For example, the preset angle can range from 40° to 50°. Alternatively, it can range from 45° to 47°.
[0034] For example, refer to Figure 1 The first control valve 11 can be a three-position valve. The working positions of the first valve core include three positions: a lowering position, an initial working position, and a lifting position. In some embodiments, refer to... Figure 1 The box-lowering working position, the initial working position, and the lifting working position can be left, center, and right, respectively. In other embodiments, the box-lowering working position, the initial working position, and the lifting working position can be center, right, and left, respectively. The specific positions of the box-lowering working position, the initial working position, and the lifting working position are not limited in this embodiment.
[0035] For example, the power cylinder 13 can perform lifting, holding, and lowering actions. When the power cylinder 13 performs the lifting action, the cargo box 31 is lifted, and the lifting angle of the cargo box 31 gradually increases. When the power cylinder 13 performs the holding action, the lifting angle of the cargo box 31 remains unchanged. When the power cylinder 13 performs the lowering action, the cargo box 31 is lowered, and the lifting angle of the cargo box 31 gradually decreases.
[0036] Furthermore, when the first valve core is in the initial working position, the connection between the first working medium source 12 and the power cylinder 13 is interrupted by the first valve core, resulting in a non-connected state. The power cylinder 13 does not operate or performs a holding action, and the cargo box 31 is not lifted. For example, the cargo box 31 remains horizontal or maintains the current lifting angle. When the first valve core is in the lifting working position, the first working medium source 12 is connected to the power cylinder 13, allowing the first working medium to enter the power cylinder 13. The power cylinder 13 extends, performing a lifting action, and the cargo box 31 is lifted. When the first valve core is in the lowering working position, the first working medium source 12 flows back from the power cylinder 13 to the first working medium source 12. The power cylinder 13 shortens, performing a lowering action, and the cargo box 31 is lowered.
[0037] Exemplarily, the limit valve 14 includes multiple working positions. These multiple working positions include at least a first working position and a second working position. Exemplarily, before the cargo box 31 is lifted and when it is lifted but not to a preset angle, the second valve core is in the first working position. At this time, the first control valve 11 can be in the initial working position or the lifting working position. When the cargo box 31 is lifted to the preset angle, the limit valve 14 is triggered, the second valve core moves from the first working position to the second working position, and the first control valve 11 can move to the initial working position.
[0038] For example, the working process of the cargo box lifting system 10 provided in this embodiment can be referred to as follows.
[0039] Before the cargo box 31 begins to be lifted, the second working medium source 19 has not yet started supplying the second working medium, and the first valve core is in the initial working position, with the power cylinder 13 not moving. When the cargo box 31 needs to be lifted, the second working medium source 19 starts supplying the second working medium, and the second valve core is in the first working position. The second working medium source 19 is connected to the control interface of the first valve core, the second working medium enters the control interface of the first valve core, the first valve core moves from the initial working position to the lifting working position, and the power cylinder 13 begins to lift the cargo box 31.
[0040] When the cargo box 31 is lifted to a preset angle, the limit valve 14 is triggered, and the second valve core moves from the first working position to the second working position. The second working medium cannot flow from the second working medium source 19 to the first valve core control interface, and the first valve core moves from the lifting working position to the initial working position. The power cylinder 13 stops lifting the cargo box 31, and the cargo box 31 remains at the preset angle. Since the monitoring module 15 can monitor the working position of the second valve core, when the second valve core moves from the first working position to the second working position, it can be determined that the cargo box 31 has been lifted to the preset angle, thereby realizing the monitoring of the lifting angle of the cargo box 31.
[0041] For example, the second working medium can be gas, and when the second valve core is in the second working position, the second working medium source 19 and the first valve core control interface can be disconnected.
[0042] For example, the second working medium can be a liquid, and when the second valve core is in the second working position, the high-pressure second working medium provided by the second working medium source 19 cannot flow to the first valve core control interface.
[0043] For example, when the power cylinder 13 performs the lowering action, the second valve core moves from the second working position to the first working position, thereby resetting the second valve core. For example, the limit valve 14 can be a two-position valve or a three-position valve. The third working position of the limit valve 14 can be set according to actual needs.
[0044] For example, the monitoring module 15 may include a position sensor or a displacement sensor to sense changes in the working position of the second valve core, thereby monitoring the lifting angle of the cargo box 31 based on the changes in the working position of the second valve core.
[0045] In some embodiments, the cargo box lifting system 10 further includes a drive assembly connected to the end of the first valve core for driving the first valve core to move along its axial direction, in conjunction with the driving force provided by the second working medium, to control the working position of the first valve core. Thus, the initial working position can be left, center, or right. Exemplarily, the drive assembly may include a spring. The spring is disposed at one or both ends of the first valve core. Exemplarily, the first control valve 11 may also be a solenoid valve.
[0046] In some embodiments, reference Figure 1 The initial working position can be the middle position, and when the first valve core is in the middle position, there is no force along the axial direction of the first valve core at the end of the first valve core. In this way, the position control of the first valve core can be achieved by the driving force provided by the second working medium, which helps to simplify the structure of the cargo box lifting system 10.
[0047] The cargo box lifting system 10 provided in this embodiment controls the process of lifting the cargo box 31 by the power cylinder 13 through the first control valve 11, and controls the working position of the first valve core of the first control valve 11 through the limit valve 14. When the cargo box 31 is lifted to a preset angle, the second valve core of the limit valve 14 moves from the first working position to the second working position, and the power cylinder 13 stops lifting. The monitoring module 15 monitors the change of the working position of the second valve core, thereby realizing the monitoring of the lifting angle of the cargo box 31 and avoiding excessive lifting of the cargo box 31, which would affect the normal operation of the vehicle.
[0048] Furthermore, this system does not require the use of the upper stop switch in existing technology to determine whether the cargo box has been lifted into place, making the structure simpler, easier to debug, and improving assembly efficiency.
[0049] Figure 2 The diagram shown is a schematic representation of the workflow of a control module provided in an embodiment of this application. Figure 1 and Figure 2 As shown, the connection passage between the limit valve 14 and the first valve core control interface is the first passage 16. The limit valve 14 has an outlet. When the second valve core is in the second working position, the first valve core control interface is connected to the outlet, and at least a portion of the second working medium in the first passage 16 flows out of the first passage 16 through the outlet.
[0050] The monitoring module 15 includes a first pressure detection element 150 and a control module 151.
[0051] The first pressure detection element 150 is disposed in the first passage 16 and is used to detect the first pressure data of the second working medium in the first passage 16 and send the first pressure data.
[0052] The control module 151 is communicatively connected to the first pressure detection element 150 and is configured to receive first pressure data. If the first pressure data is greater than a first preset value, the second valve core is determined to be in a first working position. If the first pressure data is less than a second preset value, the second valve core is determined to be in a second working position.
[0053] Specifically, refer to Figure 1 The limit valve 14 may have at least three ports: a first port that can communicate with a first valve core control interface, a second port that can communicate with a second working medium source 19, and a third port that can serve as an outlet. Exemplarily, the outlet is connected to the second working medium source 19 or the outside environment. Exemplarily, when the second working medium is a gas, the outlet is connected to the second working medium source 19 or the outside environment. Exemplarily, when the second working medium is a liquid, the outlet can be connected to the second working medium source 19.
[0054] When the second valve core is in the first working position, the second working medium source 19 flows into the first passage 16 through the limit valve 14 and drives the first valve core to move. When the first pressure data is greater than the first preset value, it indicates that the second working medium source 19 is connected to the control interface of the first valve core, and therefore, it is determined that the second valve core is in the first working position. For example, the first preset value can be set according to the pressure of the second working medium source 19 or the pressure when the second working medium source 19 provides the second working medium to the first passage 16.
[0055] When the second valve core is in the second working position, it cuts off the flow of the second working medium from the second working medium source 19 to the first valve core control interface. The second working medium cannot continue to enter the first passage 16. Since the first valve core control interface is connected to the outlet, at least a portion of the second working medium in the first passage 16 will flow out of the first passage 16 through the outlet, causing the pressure in the first passage 16 to continuously decrease. When the first pressure data is less than the second preset value, it indicates that at least a portion of the second working medium has flowed out of the first passage 16; therefore, it is determined that the second valve core is in the second working position. By setting the second preset value, the interference of pressure fluctuations in the first passage 16 on the judgment result can be avoided. For example, the second preset value can be set based on the first preset value and the external pressure or the pressure of the second working medium source 19. It is understood that the second preset value is less than or equal to the first preset value.
[0056] For example, the control module 151 can be further configured to determine that the second valve core is in the second working position when the first pressure data is less than the second preset value and the duration of the first pressure data being less than the second preset value is greater than a preset duration. This can further avoid the interference of pressure fluctuations in the first passage 16 on the determination result, and can also avoid the interference of the determination result when the second valve core is in the first working position and the second working medium source 19 gradually flows into the first passage 16.
[0057] The first pressure sensing element 150 can be any element capable of detecting the pressure of the first working medium. For example, the first pressure sensing element 150 may include one or more combinations of a pressure sensor, a pressure switch (also called a pressure relay), and a pressure transmitter. The first pressure sensing element 150 may also include a communication interface to transmit first pressure data to the control module 151.
[0058] The control module 151 may include a central processing unit (CPU), or a processor and a memory, wherein the memory may be used to store first pressure data, a first preset value, a second preset value, and instructions executable by the processor. For example, the control module 151 may also include a vehicle control unit (VCU).
[0059] The cargo box lifting system 10 provided in this embodiment includes a monitoring module 15 comprising a first pressure detection element 150 and a control module 151. The first pressure detection element 150 detects the first pressure data of the second working medium in the first passage 16. After receiving the first pressure data, the control module 151 determines whether the second valve core is located in the first working position or the second working position by comparing the first pressure data with the first preset value and the second preset value, thereby realizing the monitoring of the working position of the second valve core. The first pressure detection element 150 typically has a high service life and stability, which improves the reliability of the monitoring module 15.
[0060] Figure 3 The diagram shown is a schematic representation of the workflow of a control module provided in another embodiment of this application. In some embodiments, such as Figure 1 and Figure 3 As shown, the connection passage between the second working medium source 19 and the limit valve 14 is the second passage 17.
[0061] The monitoring module 15 also includes a second pressure detection element 152. The second pressure detection element 152 is disposed in the second passage 17 and is used to detect the second pressure data of the second working medium in the second passage 17. The second pressure detection element 152 is communicatively connected to the control module 151 and sends the second pressure data.
[0062] The control module 151 is further configured to receive second pressure data, determine that the second valve core is in the first working position when both the first pressure data and the second pressure data are greater than the first preset value, and determine that the second valve core is in the second working position when the first pressure data is less than the second preset value and the second pressure data is greater than the first preset value.
[0063] Specifically, when the second valve core is in the first working position, the second working medium gradually flows into the second passage 17 and the first passage 16, and the pressure in the second passage 17 and the first passage 16 gradually increases. If both the first pressure data and the second pressure data are greater than the first preset value, it indicates that the second working medium source 19 is connected to the first valve core control interface. Therefore, it is determined that the second valve core is in the first working position.
[0064] When the second valve core is in the second working position, it cuts off the flow of the second working medium from the second working medium source 19 to the first valve core control interface. The second working medium cannot continue to enter the first passage 16, and at least a portion of the second working medium in the first passage 16 will flow out of the first passage 16 through the outlet, causing the pressure in the first passage 16 to continuously decrease. At this time, the second working medium located in the second passage 17 remains in the second passage. If the first pressure data is less than the second preset value and the second pressure data is greater than the first preset value, it indicates that at least a portion of the second working medium has flowed out of the first passage 16, and the second working medium in the second passage 17 remains in the second passage. Therefore, it is determined that the second valve core is in the second working position.
[0065] For example, the control module 151 can be further configured to determine that the second valve core is in the second working position when the first pressure data is less than the second preset value, the second pressure data is greater than the first preset value, and the duration of the first pressure data being less than the second preset value and the second pressure data being greater than the first preset value is greater than a preset duration.
[0066] The second pressure sensing element 152 can be any element capable of detecting the pressure of the first working medium. For example, the second pressure sensing element 152 may include one or more combinations of a pressure sensor, a pressure switch (also called a pressure relay), and a pressure transmitter. The second pressure sensing element 152 may also include a communication interface to send second pressure data to the control module 151.
[0067] The cargo box lifting system 10 provided in this embodiment includes a monitoring module 15 that further includes a second pressure detection element 152. The second pressure detection element 152 detects the second pressure data of the second working medium in the second passage 17. After receiving the second pressure data, the control module 151 determines the working position of the second valve core by comparing the first pressure data and the second pressure data with the first preset value and the second preset value, thereby achieving monitoring of the working position of the second valve core. Since damage to the limit valve may cause the first pressure data to be less than the second preset value, detecting the second pressure data in the second passage 17 and determining the working position of the second valve core based on the first and second pressure data increases the confidence level of the determination result.
[0068] In some embodiments, the monitoring module 15 also has a power cylinder action judgment function.
[0069] For example, the control module 151 can be configured to determine that the power cylinder 13 is performing a lifting action when the first pressure data and the second pressure data are greater than a first preset value. The control module 151 can also be configured to determine that the cargo box 31 has been lifted to a preset angle when the first pressure data is less than the second preset value and the second pressure data is greater than the first preset value, at which point the power cylinder 13 stops lifting and performs a holding action. This configuration improves the intelligence level of the cargo box lifting system 10.
[0070] In some embodiments, the control module 151 is further configured to first determine that the limit valve 14 is faulty when the power cylinder 13 needs to perform a lifting action, the value of the first pressure data is zero, the value of the second pressure data is not zero, and the power cylinder 13 does not perform a lifting action.
[0071] Specifically, the monitoring module 15 also has a fault diagnosis function, further improving the intelligence level of the cargo box lifting system 10. Since the power cylinder 13 needs to perform a lifting action, a non-zero value in the second pressure data indicates that the second working medium is flowing into the second passage 17. Since the first pressure data is zero and the power cylinder 13 does not perform a lifting action, it indicates that the cargo box 31 has not been lifted and the second working medium has not flowed into the first passage 16. Therefore, the limit valve 14 is determined to be faulty. Since the above situation could also be caused by leakage in the first passage 16, the limit valve 14 is first determined to be faulty. Specifically, no lifting action in the power cylinder 13 means that the lifting angle of the cargo box 31 has not changed.
[0072] For example, the control module 151 can also be configured to first determine that the second working medium source 19 is faulty when the power cylinder 13 needs to perform a lifting action, the value of the first pressure data is zero, and the value of the second pressure data is zero. For example, the second working medium source is not turned on.
[0073] For example, the control module 151 can also be configured to first determine that the first control valve is faulty when the power cylinder 13 needs to perform a lifting action, the value of the first pressure data is not zero, the value of the second pressure data is not zero, and the power cylinder 13 does not perform a lifting action.
[0074] Figure 4 The diagram shown is a schematic diagram of the workflow of the control module provided in another embodiment of this application.
[0075] In some embodiments, such as Figure 1 and Figure 4As shown, the cargo box lifting system 10 also includes a second control valve 18 and a valve core control module. The second control valve 18 is disposed in the connection passage (i.e., the second passage 17) between the second working medium source 19 and the limit valve 14, and is used to control the on / off state and flow direction of the second working medium. The second control valve 18 includes a third valve core, which has a third working position and a fourth working position. The valve core control module is communicatively connected to the control module 151 and is used to control the working position of the third valve core.
[0076] When the third valve core is in the third working position, the second working medium source 19 is connected to the limit valve 14, and the second working medium flows into the limit valve 14 through the second control valve 18. When the third valve core is in the fourth working position, the second working medium source 19 is not connected to the limit valve 14.
[0077] When the control module 151 determines that the second valve core is in the second working position, the control module 151 sends a first control command to the valve core control module, and the valve core control module controls the third valve core to move to the fourth working position.
[0078] By setting the second control valve 18 and the valve core control module, the control module 151 can control the working position of the third valve core, intelligently control the on / off state and flow direction of the second working medium, and further improve the intelligence level of the cargo box lifting system 10.
[0079] Furthermore, when the second valve core is in the second working position, it indicates that the cargo box 31 has been lifted to a preset angle, and the power cylinder 13 stops lifting. At this time, the connection between the second working medium source 19 and the control interface of the first valve core has been cut off by the second valve core, and the second working medium source 19 no longer needs to provide the second working medium to the limit valve 14. Therefore, after the limit valve 14 is triggered, the control module 151 moves the third valve core to the fourth working position, which can quickly cut off the connection between the second working medium source 19 and the limit valve 14, achieving rapid response and saving energy.
[0080] For example, before the power cylinder 13 performs the lifting action, the third valve core is in the fourth working position. For example, when the power cylinder 13 needs to perform the lifting action, the control module 151 sends a second control command to the valve core control module, and the valve core control module controls the third valve core to move to the third working position.
[0081] Exemplarily, the valve core control module may include a valve core drive assembly, a communication interface, and a valve core control module. The valve core control module communicates with the control module 151 via the communication interface to send first pressure data to the control module 151. The valve core control module may include a CPU, and may also be a processor and a memory, wherein the memory can be used to store instructions for the control drive assembly to generate actions and instructions executable by the processor. The valve core drive assembly is used to drive the movement of the third valve core. The valve core drive assembly can be configured according to the structure of the second control valve. Exemplarily, the second control valve may be a solenoid valve, and the valve core drive assembly may include an electromagnet actuator.
[0082] In some embodiments, reference Figure 1 The first control valve 11 also has a second valve core control interface. The second control valve 18 is connected to the second valve core control interface.
[0083] The third valve core also has a fifth working position. When the third valve core is in the fifth working position, the second working medium source 19 is connected to the second valve core control interface, and the second working medium flows into the second valve core control interface from the second working medium source 19 to change the position of the first valve core. When the power cylinder 13 needs to perform a lowering action, the control module 151 sends a third control command to the valve core control module, and the valve core control module controls the third valve core to move to the fifth working position.
[0084] Specifically, when the power cylinder 13 needs to perform the box-dropping action, for example when the material in the cargo box 31 has been unloaded, the control module 151 moves the third valve core to the fifth working position, and the second working medium flows into the second valve core control interface from the second working medium source 19 to change the position of the first valve core, for example, to move the first valve core from the initial working position to the box-dropping working position, thereby realizing the box-dropping action of the power cylinder 13.
[0085] Understandably, before the power cylinder 13 performs the box-lowering action, the second valve core is still in the second working position, and the second working medium in the first passage 16 will flow out of the first passage 16 through the outlet.
[0086] Specifically, the second control valve 18 is a three-position valve. For example, refer to... Figure 1 The third, fourth, and fifth working positions are the left, center, and right positions of the valve, respectively. For example, when the first working medium is a liquid, the second control valve 18 can be a hydraulic valve. When the second working medium is a gas, the second control valve 18 can be a pneumatic control valve. For example, refer to... Figure 1The second working medium is gas, and the second control valve 18 has five ports. Its first port is connected to the second working medium source 19; its second and third ports are connected to the outside via check valves; its fourth port is connected to the limit valve 14; and its fifth port is connected to the second valve core control interface. Exemplarily, the first valve core control interface and the second valve core control interface are located on the first valve core.
[0087] The cargo box lifting system 10 provided in this embodiment also has a fifth working position for the third valve core. When the power cylinder 13 needs to perform the box lowering action, the control module 151 sends a third control command to the valve core control module. The valve core control module controls the third valve core to move to the fifth working position. The second working medium flows into the second valve core control interface from the second working medium source 19 and changes the position of the first valve core, realizing the automatic lowering of the cargo box 31 and further improving the intelligence level of the cargo box lifting system 10.
[0088] In some embodiments, reference Figure 1 The cargo box lifting system 10 also includes a quick-release valve 20. The quick-release valve 20 is located in the first passage 16 and includes a first inlet and outlet, a second inlet and outlet, and a discharge port. The first inlet and outlet are connected to the limit valve 14, the second inlet and outlet are connected to the first valve core control interface, and the discharge port is connected to the second working medium source 19 or the outside.
[0089] For example, when the second valve core is in the first working position, the limit valve is connected to the first inlet and outlet, the first inlet and outlet are connected to the second inlet and outlet, and the second working medium can flow from the second working medium source 19 through the limit valve 14 and the quick discharge valve 20 to the first valve core control interface. Neither the first inlet and outlet nor the second inlet and outlet are connected to the discharge port.
[0090] For example, when the second valve core is in the second operating position, the second inlet and outlet are connected to the discharge port. The second working medium between the limit valve 14 and the quick-release valve 20 can flow out through the outlet, and the second working medium between the quick-release valve 20 and the first valve core control interface can flow out through the discharge port. For example, when the second valve core is in the second operating position, the first inlet and outlet are also connected to the discharge port. The second working medium between the limit valve 14 and the quick-release valve 20 can also flow out through the discharge port.
[0091] For example, the first pressure sensing element 150 may be disposed in the connection passage between the limit valve 14 and the quick-release valve 20. For example, when the second working medium is gas, the discharge port is connected to the second working medium source 19 or the outside. For example, when the second working medium is liquid, the discharge port may be connected to the second working medium source 19.
[0092] The cargo box lifting system 10 provided in this embodiment also includes a quick-release valve 20. By setting the quick-release valve 20, the second working medium in the first passage 16 can be quickly discharged, causing the pressure in the first passage 16 to drop more rapidly. This allows the first pressure data to quickly meet the condition of being less than the second preset value, enabling the monitoring module 15 to quickly determine that the second valve core is in the second working position, thereby quickly determining that the cargo box 31 has been lifted to the preset angle, reducing the reaction time of the cargo box lifting system 10 and improving its sensitivity.
[0093] In some embodiments, the cargo box lifting system 10 further includes a first working medium conveying device 21. The first working medium conveying device 21 is connected to a first working medium source 12 and is used to convey the first working medium. Specifically, the first working medium conveying device 21 is used to provide power for the transmission of the first working medium. For example, when the first working medium is a liquid, the first working medium conveying device 21 may be a hydraulic pump. For example, when the first working medium is a liquid, the first working medium conveying device 21 may be an air pump.
[0094] In some embodiments, the cargo box lifting system 10 further includes a second working medium delivery device, which is connected to a second working medium source 19 and is used to deliver the second working medium. Specifically, the second working medium delivery device is used to provide power for the transmission of the second working medium. Exemplarily, when the second working medium is a liquid, the second working medium delivery device may be a hydraulic pump. Exemplarily, when the second working medium is a liquid, the second working medium delivery device may be an air pump. Exemplarily, the second working medium delivery device and the second working medium source 19 may be a single device, such as an air tank.
[0095] In some embodiments, the cargo box lifting system 10 may also include a first working medium source 12 and a second working medium source 19.
[0096] In some embodiments, reference Figure 1 When the first working medium source 12 is a liquid, the cargo box lifting system 10 may further include a filter 22 and an overflow valve 23. Exemplarily, the first control valve 11 may be a three-position four-way valve with four ports. Its first port is connected to the power cylinder 13, its second port is connected to the first working medium delivery device 21, its third port is connected to the filter 22, and its fourth port is connected to the overflow valve 23. Exemplarily, both the filter 22 and the overflow valve 23 are connected to the first working medium source 12. Exemplarily, the fourth port of the first control valve 11 is connected sequentially to the overflow valve 23, the filter 22, and the first working medium source 12.
[0097] The embodiments of the cargo box lifting system of this application have been described in detail above. The embodiments of the dump truck of this application are described in detail below. It should be understood that the descriptions of the embodiments of the cargo box lifting system correspond to the descriptions of the embodiments of the dump truck; therefore, any parts not described in detail can be referred to the preceding embodiments of the cargo box lifting system.
[0098] Figure 5 The diagram shown is a structural schematic of a dump truck provided in an embodiment of this application.
[0099] like Figure 5 As shown, the dump truck 1 includes: a frame 30, a cargo box 31, and a cargo box lifting system 10 mentioned in any of the above embodiments. The cargo box 31 is disposed on the frame 30 and rotatably connected to the frame 30 about a rotation axis. The cargo box lifting system 10 is disposed on the frame 30 and is used to lift the cargo box 31 about a rotation axis.
[0100] Specifically, the dump truck 1 can be a vehicle capable of unloading goods or materials carried in the cargo box 31 on its own. For example, the dump truck 1 can be a vehicle with autonomous driving capabilities, such as an unmanned vehicle. For example, the dump truck 1 can include a mining truck.
[0101] Exemplarily, the dump truck 1 may also include wheels disposed on and rotatably connected to the frame 30. Exemplarily, the frame 30 may include a vehicle chassis. The cargo box 31 is disposed on and rotatably connected to the vehicle chassis about a rotation axis.
[0102] Exemplarily, the power cylinder 13 is connected to the cargo box 31 to lift the cargo box 31. Further, the power cylinder 13 is rotatably connected to the cargo box 31. Exemplarily, the power cylinder 13 includes a cylinder body and a piston slidably connected to the cylinder body. The piston is connected to the cargo box 31. Further, the piston is rotatably connected to the cargo box 31.
[0103] For example, the limit valve 14 is disposed on the vehicle frame 30. For instance, the limit valve 14 is disposed at the rear end of the vehicle frame 30. When the cargo box 31 is raised to a preset angle, the cargo box 31 touches the second valve core, triggering the limit valve 14.
[0104] The dump truck 1 provided in this embodiment controls the process of lifting the cargo box 31 by the power cylinder 13 through the first control valve 11, and controls the working position of the first valve core of the first control valve 11 through the limit valve 14. When the cargo box 31 is lifted to a preset angle, the second valve core of the limit valve 14 moves from the first working position to the second working position, and the power cylinder 13 stops lifting. The change of the working position of the second valve core is monitored by the monitoring module 15, thereby monitoring the lifting angle of the cargo box 31 and avoiding excessive lifting of the cargo box 31, which would affect the normal operation of the vehicle.
[0105] Furthermore, this dump truck does not require the use of the upper stop switch in existing technology to determine whether the cargo box has been lifted into place, making its structure simpler, easier to debug, and improving assembly efficiency.
[0106] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.
[0107] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “equipped with,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it. It should also be noted that in the apparatuses, devices, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalent solutions of this application.
[0108] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0109] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.
Claims
1. A cargo box lifting system (10), characterized in that, include: The first control valve (11) is connected to the first working medium source (12) and is used to control the on / off state and flow direction of the first working medium. The first control valve (11) includes a first valve core and has a first valve core control interface. At least one power cylinder (13) is connected to the first control valve (11) to allow the first working medium to enter the power cylinder (13), the power cylinder (13) being used to lift the cargo box (31). A limit valve (14) is disposed in the connection passage between the second working medium source (19) and the first valve core control interface. The limit valve (14) includes a second valve core, which has a first working position and a second working position. The monitoring module (15) is configured to monitor the working position of the second valve core; When the second valve core is in the first working position, the second working medium source (19) is connected to the first valve core control interface, and the second working medium enters the first valve core control interface to change the working position of the first valve core. When the second valve core is in the second working position, the second valve core cuts off the passage of the second working medium from the second working medium source (19) to the first valve core control interface; When the cargo box (31) is lifted to a preset angle, the second valve core moves from the first working position to the second working position, and the power cylinder (13) stops lifting.
2. The cargo box lifting system (10) according to claim 1, characterized in that, The connection path between the limit valve (14) and the first valve core control interface is the first path (16). The limit valve (14) has an outlet. When the second valve core is in the second working position, the first valve core control interface is connected to the outlet, and at least a portion of the second working medium in the first passage (16) flows out of the first passage (16) through the outlet. The monitoring module (15) includes: A first pressure detection element (150) is disposed in the first passage (16) for detecting the first pressure data of the second working medium in the first passage (16) and sending the first pressure data. The control module (151) is communicatively connected to the first pressure detection element (150) and is configured to receive the first pressure data, determine that the second valve core is located in the first working position when the first pressure data is greater than a first preset value, and determine that the second valve core is located in the second working position when the first pressure data is less than a second preset value.
3. The cargo box lifting system (10) according to claim 2, characterized in that, The connection passage between the second working medium source (19) and the limit valve (14) is the second passage (17). The monitoring module (15) further includes: The second pressure detection element (152) is disposed in the second passage (17) and is used to detect the second pressure data of the second working medium in the second passage (17). The second pressure detection element (152) is communicatively connected to the control module (151) and sends the second pressure data. The control module (151) is further configured to receive the second pressure data, determine that the second valve core is located in the first working position when both the first pressure data and the second pressure data are greater than the first preset value, and determine that the second valve core is located in the second working position when the first pressure data is less than the second preset value and the second pressure data is greater than the first preset value.
4. The cargo box lifting system (10) according to claim 3, characterized in that, The control module (151) is also configured to first determine that the limit valve (14) is faulty when the power cylinder (13) needs to perform a lifting action, the value of the first pressure data is zero, the value of the second pressure data is not zero, and the power cylinder (13) does not perform a lifting action.
5. The cargo box lifting system (10) according to claim 2, characterized in that, Also includes: The second control valve (18) is disposed in the connection passage between the second working medium source (19) and the limit valve (14) for controlling the on / off state and flow direction of the second working medium. The second control valve (18) includes a third valve core, which has a third working position and a fourth working position. The valve core control module is communicatively connected to the control module (151) and is used to control the working position of the third valve core; When the third valve core is in the third working position, the second working medium source (19) is connected to the limit valve (14), and the second working medium flows into the limit valve (14) through the second control valve (18). When the third valve core is in the fourth working position, the second working medium source (19) is not connected to the limit valve (14); When the control module (151) determines that the second valve core is in the second working position, the control module (151) sends a first control command to the valve core control module, and the valve core control module controls the third valve core to move to the fourth working position.
6. The cargo box lifting system (10) according to claim 5, characterized in that, The first control valve (11) also has a second valve core control interface; The second control valve (18) is connected to the second valve core control interface; The third valve core also has a fifth working position. When the third valve core is in the fifth working position, the second working medium source (19) is connected to the second valve core control interface, and the second working medium flows from the second working medium source (19) into the second valve core control interface to change the position of the first valve core. When the power cylinder (13) is required to perform a box-lowering action, the control module (151) sends a third control command to the valve core control module, and the valve core control module controls the third valve core to move to the fifth working position.
7. The cargo box lifting system (10) according to any one of claims 1 to 3, characterized in that, Also includes: A quick-release valve (20) is provided in the connection passage between the limit valve (14) and the first valve core control interface. The quick-release valve (20) includes a first inlet and outlet, a second inlet and outlet and a discharge port. The first inlet and outlet are connected to the limit valve (14), the second inlet and outlet are connected to the first valve core control interface, and the discharge port is connected to the second working medium source (19) or the outside.
8. The cargo box lifting system (10) according to any one of claims 1 to 3, characterized in that, Also includes: The first working medium conveying device (21) is connected to the first working medium source (12) and is used to convey the first working medium, and / or The second working medium conveying device is connected to the second working medium source (19) and is used to convey the second working medium.
9. The cargo box lifting system (10) according to any one of claims 1 to 3, characterized in that, The first working medium is a liquid, and / or The second working medium is gas.
10. A dump truck (1), characterized in that, include: Frame (30); The cargo box (31) is disposed on the frame (30) and is rotatably connected to the frame (30) about a rotation axis; The cargo box lifting system (10) according to any one of claims 1-9 is disposed on the vehicle frame (30) for lifting the cargo box (31) about the rotation axis.