Metal 3D printing integrated pump control type hydraulic leveling system and fire fighting truck

Abstract

The application relates to a metal 3D printing integrated pump control type hydraulic leveling system and a fire fighting truck. The fire fighting truck aerial work platform comprises a bearing component (5), a work platform body (1) installed on the bearing component (5) and capable of swinging relative to the bearing component (5) to adjust the levelness of the work platform body (1), a hydraulic executing element (4) connected with the bearing component (5) and the work platform body (1) respectively and configured to drive the work platform body (1) to swing relative to the bearing component (5), and a hydraulic power unit (2) comprising a hydraulic pump (7) and a first reversing valve (9) connected with the hydraulic pump (7), the first reversing valve (9) being connected with the hydraulic executing element (4), and the hydraulic power unit (2) comprising a first component (16), a first pump cavity accommodating a pump suction component of the hydraulic pump (7) and a first reversing valve cavity accommodating a valve core of the first reversing valve (9) being formed on the first component (16).

Description

Technical Field

[0001] This invention relates to the field of engineering machinery, and more specifically, to a fire truck aerial work platform and a fire truck. Background Technology

[0002] Aerial ladder fire trucks, aerial ladder trucks, and aerial work platforms are emergency rescue equipment used for high-rise firefighting, personnel rescue, and special operations. Manned aerial rescue vehicles represent the highest level of safety performance, advanced design concepts, and technological intensity among aerial work vehicles, possessing extremely high technological content. The leveling hydraulic system is a crucial system for real-time adjustment of the work platform's angle, ensuring personnel stability and precise execution of rescue missions. Currently, limited by traditional design and manufacturing processes, the hydraulic components of the aerial work platform's leveling hydraulic system are highly discrete and have low integration, resulting in a large weight and volume. This restricts the platform's effective space and reduces its safety factor, limiting its ability to accommodate diverse rescue equipment and personnel. Currently, the 53-meter aerial ladder fire truck platform in the high-end fire protection product series has a load capacity of only 300kg, and the usable personnel space is only 80%. The hydraulic system pumps, valves, motors, actuators and other components are all manufactured separately and connected by pipelines, and are distributed on the platform. In addition, the platform's electrical control system, fire monitors and their water pipes, etc., result in no extra space on the platform to arrange new functions. Compared with foreign products, the platform has no space to arrange relay water supply devices, which makes it impossible for firefighters to carry external water sources into indoor rescues, which greatly affects rescue efficiency and reduces the product's market competitiveness. Summary of the Invention

[0003] The present invention aims to provide a fire truck aerial work platform and a fire truck to improve the problem of unreasonable space utilization of the platform in the prior art.

[0004] According to one aspect of the present invention, the present invention provides a fire truck aerial work platform, the fire truck aerial work platform comprising:

[0005] Load-bearing components;

[0006] The work platform body is mounted on the load-bearing component and can swing relative to the load-bearing component to adjust the levelness of the work platform body;

[0007] The hydraulic actuator is connected to the load-bearing component and the work platform body respectively, and is configured to drive the work platform body to swing relative to the load-bearing component;

[0008] The hydraulic power unit includes a hydraulic pump and a first directional valve connected to the hydraulic pump. The first directional valve is connected to a hydraulic actuator. The hydraulic power unit includes a first component, on which a first pump chamber is formed to accommodate a pump suction component of the hydraulic pump and a first directional valve chamber to accommodate the valve core of the first directional valve.

[0009] In some embodiments, the first component is 3D printed.

[0010] In some embodiments, the first component further includes a flow channel connecting the hydraulic pump and the first directional valve, as well as a hydraulic fluid inlet and outlet for connecting the hydraulic actuator and the first directional valve.

[0011] In some embodiments, the hydraulic power unit further includes a first relief valve connected to a hydraulic pump, and the first component is further provided with a first relief valve chamber for accommodating the valve core of the first relief valve.

[0012] In some embodiments, the hydraulic power unit further includes a motor that is driven and connected to the hydraulic pump, and the motor is mounted at one end of the first component.

[0013] In some embodiments, the hydraulic power unit further includes a hydraulic fluid tank in communication with the hydraulic pump, the hydraulic fluid tank being mounted at the end of the first component away from the motor.

[0014] In some embodiments, the fire truck aerial work platform also includes a controller connected to the motor signal, the controller being configured to control the amount of action of the hydraulic actuator by controlling the speed of the motor.

[0015] In some embodiments, the fire truck aerial work platform also includes a manual control unit, which includes a manually operated second directional valve connected to a hydraulic actuator.

[0016] In some embodiments, the fire truck aerial work platform further includes a first shuttle valve, the first inlet of which is connected to a first reversing valve, the second inlet of which is connected to a second reversing valve, the outlet of which is connected to a hydraulic actuator, and the first component is further provided with a first shuttle valve cavity for accommodating the valve core of the first shuttle valve.

[0017] In some embodiments, the manual control unit further includes a second component having a second directional valve chamber that accommodates the valve core of a second directional valve.

[0018] In some embodiments, the manual control unit further includes a manual pump connected to a second directional valve.

[0019] In some embodiments,

[0020] The second component is provided with a second pump chamber that accommodates the pump suction component of the manual pump;

[0021] The manual control unit also includes a second relief valve connected to the manual pump, and the second component has a second relief valve chamber that accommodates the valve core of the second relief valve.

[0022] In some embodiments, the second component is 3D printed.

[0023] In some embodiments, the hydraulic actuator includes a oscillating hydraulic cylinder, which includes a fixed component and a rotating component that rotates relative to the fixed component under the drive of hydraulic fluid. One of the fixed component and the rotating component is connected to a load-bearing component, and the other is connected to the work platform body.

[0024] According to another aspect of the present invention, a fire truck is also provided, which includes the aforementioned fire truck aerial work platform.

[0025] By applying the technical solution of this application, the first pump chamber and the first directional valve chamber of the hydraulic pump are both integrated on the first component, which is conducive to miniaturization and weight reduction of the hydraulic power unit, and also conducive to reducing the number of parts of the hydraulic power unit.

[0026] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A three-dimensional structural schematic diagram of a fire truck aerial work platform according to an embodiment of the present invention is shown;

[0029] Figure 2 A three-dimensional structural schematic diagram of a fire truck aerial work platform from another angle is shown as an embodiment of the present invention;

[0030] Figure 3 A diagram of the hydraulic system of a fire truck aerial work platform according to an embodiment of the present invention is shown;

[0031] Figure 4 A schematic diagram of the hydraulic system of a fire truck aerial work platform according to an embodiment of the present invention is shown;

[0032] Figure 5 A schematic diagram of the hydraulic power unit of a fire truck aerial work platform according to an embodiment of the present invention is shown;

[0033] Figure 6 A schematic diagram of the manual control unit of a fire truck aerial work platform according to an embodiment of the present invention is shown;

[0034] Figure 7 A schematic diagram of the structure of the second component of the fire truck aerial work platform according to an embodiment of the present invention is shown;

[0035] Figure 8 A three-dimensional structural schematic diagram of the hydraulic actuator of a fire truck aerial work platform according to an embodiment of the present invention is shown;

[0036] Figure 9 A three-dimensional structural schematic diagram of the hydraulic actuator of a fire truck aerial work platform according to an embodiment of the present invention is shown from another angle; and

[0037] Figure 10 A structural schematic diagram of a fire truck according to an embodiment of the present invention is shown.

[0038] In the picture:

[0039] 1. Working platform body; 2. Hydraulic power unit; 3. Manual control unit; 4. Hydraulic actuator; 5. Bearing component; 6. Hydraulic fluid tank; 7. Hydraulic pump; 8. Motor; 9. First directional valve; 10. First relief valve; 11. First shuttle valve; 12. Second shuttle valve; 13. Manual pump; 14. Second relief valve; 15. Second directional valve; 16. First component; 17. Second component; 18. Hydraulic fluid inlet and outlet; 19. Fixed component; 20. Rotating component; 21. Connecting lug; 22. Flange; 23. Rotation detection component; 24. Hollow structure; 25. Working arm; 26. Balance valve. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Combination Figures 1 to 4 As shown, the fire truck aerial work platform of this embodiment includes a load-bearing component 5, a work platform body 1, a hydraulic actuator 4, and a hydraulic power unit 2.

[0042] The work platform body 1 is mounted on the support member 5 and can swing relative to the support member 5 to adjust the levelness of the work platform body 1. The hydraulic actuator 4 is connected to both the support member 5 and the work platform body 1 and is configured to drive the work platform body 1 to swing relative to the support member 5. The hydraulic power unit 2 includes a hydraulic pump 7 and a first directional valve 9 connected to the hydraulic pump 7. The first directional valve 9 is connected to the hydraulic actuator 4. The hydraulic power unit 2 includes a first component 16, on which a first pump chamber accommodating the pump suction component of the hydraulic pump 7 and a first directional valve chamber accommodating the valve core of the first directional valve 9 are formed.

[0043] In this embodiment, the first pump chamber and the first directional valve chamber of the hydraulic pump 7 are both integrated on the first component, which is beneficial to the miniaturization and weight reduction of the hydraulic power unit 2, and also to reducing the number of parts of the hydraulic power unit 2.

[0044] In some embodiments, the hydraulic pump 7 is a gear pump, and the suction component is a gear of the gear pump. In other embodiments, the hydraulic pump 7 is an impeller pump, and the suction component is an impeller of the impeller pump. In still other embodiments, the hydraulic pump 7 is a piston pump, and the suction component is a piston of the piston pump.

[0045] In some embodiments, the first component 16 is 3D printed.

[0046] The first component 16 also has a flow channel connecting the hydraulic pump 7 and the first directional valve 9, as well as a hydraulic fluid inlet and outlet 18 for connecting the hydraulic actuator 4 and the first directional valve 9.

[0047] In this embodiment, the first directional valve 9 includes an inlet communicating with the hydraulic pump 7, a return port communicating with the hydraulic fluid tank 6, a first working port connected to the first chamber of the hydraulic actuator 4, and a second working port connected to the second chamber of the first hydraulic actuator 4. In some embodiments, the first chamber is the rod-side chamber of the hydraulic actuator 4, and the second chamber is the rodless chamber of the hydraulic actuator 4.

[0048] When hydraulic fluid is introduced into the first chamber of the hydraulic actuator 4 and hydraulic fluid is discharged from the second chamber, the moving parts of the hydraulic actuator 4 move along the first direction. When hydraulic fluid is introduced into the second chamber of the hydraulic actuator 4 and hydraulic fluid is discharged from the first chamber, the moving parts of the hydraulic actuator 4 move along the second direction, which is opposite to the first direction.

[0049] The first component 16 is provided with two hydraulic fluid inlets and outlets 18. One hydraulic fluid inlet and outlet is connected to the first working port of the first directional valve 9, and the other is connected to the second working port of the first directional valve 9.

[0050] In some embodiments, the hydraulic power unit 2 further includes a first relief valve 10 connected to the hydraulic pump 7, and the first component 16 is also provided with a first relief valve chamber for accommodating the valve core of the first relief valve 10.

[0051] like Figure 5 As shown, the hydraulic power unit 2 also includes a motor 8 that is connected to the hydraulic pump 7 for transmission. The motor 8 is installed at one end of the first component 16.

[0052] In some embodiments, the hydraulic power unit 2 further includes a hydraulic fluid tank 6 in communication with the hydraulic pump 7, the hydraulic fluid tank 6 being installed at the other end of the first component 16 away from the motor 8.

[0053] The fire truck aerial work platform also includes a controller connected to the motor 8 via a signal. The controller is configured to control the actuation of the hydraulic actuator 4 by controlling the rotational speed of the motor 8. In this embodiment, components such as the hydraulic fluid tank 6, the first directional valve 9, the motor 8, and the hydraulic pump 7 are integrated into a single unit, which facilitates the lightweighting and miniaturization of the hydraulic power unit 2 and reduces the number of parts, simplifying the structure of the hydraulic power unit 2 and reducing the space occupied by the hydraulic power unit 2.

[0054] like Figure 3 , 4 As shown in Figure 6, the fire truck aerial work platform also includes a manual control unit 3, which includes a manually operated second directional valve 15, which is connected to a hydraulic actuator 4.

[0055] The fire truck aerial work platform also includes a first shuttle valve 11. The first inlet of the first shuttle valve 11 is connected to the first reversing valve 9, the second inlet of the first shuttle valve 11 is connected to the second reversing valve 15, and the outlet of the first shuttle valve 11 is connected to the hydraulic actuator 4. The first component 16 is also provided with a first shuttle valve cavity that accommodates the valve core of the first shuttle valve 11.

[0056] In some embodiments, the first component 16 is made of one of carbon steel, alloy steel, stainless steel, and aluminum alloy. The first component 16 employs a topology-optimized design.

[0057] The second directional valve 15 includes an inlet for introducing hydraulic fluid, a return port communicating with the hydraulic fluid tank 6, a first working port connected to the first chamber of the hydraulic actuator 4, and a second working port connected to the second chamber of the first hydraulic actuator 4. In some embodiments, the first chamber is the rod-side chamber of the hydraulic actuator 4, and the second chamber is the rodless chamber of the hydraulic actuator 4.

[0058] In this embodiment, the outlet of the first shuttle valve 11 is connected to the rod chamber of the hydraulic actuator 4, the first inlet of the first shuttle valve 11 is connected to the first working port of the first directional valve 9, and the second inlet of the first shuttle valve 11 is connected to the first working port of the second directional valve 15.

[0059] The fire truck aerial work platform also includes a second shuttle valve 12. The outlet of the second shuttle valve 12 is connected to the rodless chamber of the hydraulic actuator 4. The first inlet of the second shuttle valve 12 is connected to the second working port of the first directional valve 9. The second inlet of the second shuttle valve 12 is connected to the second working port of the second directional valve 15.

[0060] In some embodiments, the manual control unit 3 further includes a second component 17, which has a second reversing valve chamber for accommodating the valve core of the second reversing valve 15.

[0061] The second component 17 is made of one of the following materials: carbon steel, alloy steel, stainless steel, and aluminum alloy. The second component 17 employs a topology-optimized design, incorporating a hollow structure 24 at locations without hydraulic flow channels to reduce its mass. See [link to relevant documentation]. Figure 7 .

[0062] like Figure 6 As shown, the manual control unit 3 also includes a manual pump 13 connected to the second reversing valve 15.

[0063] The second component 17 is provided with a second pump chamber that accommodates the pump suction component of the manual pump 13; the manual control unit 3 also includes a second overflow valve 14 connected to the manual pump 13, and the second component 17 is provided with a second overflow valve chamber that accommodates the valve core of the second overflow valve 14.

[0064] In this embodiment, the second reversing valve 15 and the manual pump 13 of the manual control unit 3 are integrated into a single component, which is beneficial for achieving lightweighting, miniaturization and reducing the number of parts of the manual control unit 3, simplifying the structure of the manual control unit 3 and reducing the space occupied by the manual control unit 3.

[0065] In some embodiments, the second component 17 is 3D printed.

[0066] In this embodiment, the manual pump 13 is a foot-operated manual pump. The manual control unit 3 is installed above the base of the work platform body 1 and at the bottom of the fence of the work platform body 1. The hydraulic power unit 2 is located below the base of the work platform body 1 to save working space on the work platform body 1.

[0067] like Figure 8 and 9As shown, the hydraulic actuator 4 includes a swing hydraulic cylinder, which includes a fixed part 19 and a rotating part 20 that rotates relative to the fixed part 19 under the drive of hydraulic fluid. One of the fixed part 19 and the rotating part 20 is connected to the work platform body 1, and the other is connected to the load-bearing part 5.

[0068] The fire truck aerial work platform also includes a balance valve 26, which is connected to the hydraulic actuator 4 to ensure the smooth movement of the hydraulic actuator 4.

[0069] The balance valve 26 includes a first fluid port A and a second fluid port B. Hydraulic fluid is introduced into one of the first fluid port A and the second fluid port B, while hydraulic fluid is discharged into the hydraulic fluid tank 6 through the other. When hydraulic fluid is introduced into the first fluid port A, the rotating component 20 rotates counterclockwise, and when hydraulic fluid is introduced into the second fluid port B, the rotating component 20 rotates clockwise.

[0070] The fixed component 19 is provided with a connecting lug 21 for connecting to the work platform body 1. The rotating component 20 is provided with a flange 22 for connecting to the load-bearing component 5.

[0071] The fire truck aerial work platform also includes a rotation detection component 23 for detecting the amount of rotation of the rotating component 20. In some embodiments, the rotation detection component 23 includes an encoder.

[0072] The fire truck aerial work platform also includes an angle detection component for detecting the angle of the work platform body 1 relative to the horizontal direction. By monitoring the angle detected by the angle detection component and the rotation detected by the rotation detection component, the attitude of the work platform body 1 can be monitored in real time.

[0073] Combination Figure 1 and Figure 2 As shown, the supporting component 5 includes a connecting arm, and the hydraulic actuator 4 is mounted on the base of the work platform body 1. The connecting arm is connected to the hydraulic actuator 4 and extends in a direction away from the work platform body 1. In some embodiments, two hydraulic actuators 4 are provided on the work platform body 1, and each hydraulic actuator 4 is connected to a connecting arm. The two hydraulic actuators 4 are arranged symmetrically with respect to the centerline of the work platform body 1.

[0074] In some embodiments, the hydraulic actuator 4 is a lightweight, small-sized, high-torque oscillating hydraulic cylinder. Compared with existing linear motion hydraulic cylinders or other linear motion devices, it has the advantages of small footprint and light weight.

[0075] The diameter of the swing hydraulic cylinder is ≤198mm, the axial length of the swing hydraulic cylinder is ≤171mm, the rotation angle of the rotating part 20 is ≥170°, and a single hydraulic cylinder can output a torque of 2300NM under the pressure of 20MPa hydraulic fluid.

[0076] The hydraulic power unit 2 in this embodiment can be installed on aerial emergency rescue fire trucks such as ladder fire trucks, aerial ladder fire trucks, aerial platforms, and scissor lift aerial platforms.

[0077] The fire truck aerial work platform of this embodiment has the following technical effects:

[0078] (1) The system has low energy consumption. In this embodiment, the hydraulic power unit 2 adopts metal 3D printing technology to realize the conformal design of the oil passage structure and the conformal integration design of the plug-in. The flow channel pressure loss is reduced. The hydraulic actuator 4 adopts pump control mode. Compared with the traditional valve control mode, the high-precision motor 8 is used to directly realize the flow supply on demand, reducing waste. The system always maintains high-efficiency operation. The motor does not need to rotate at high speed. According to the speed requirement, it realizes automatic adjustment, which greatly reduces the energy consumption of the system.

[0079] (2) The work platform has a large space. The hydraulic power unit 2 in this embodiment integrates multiple components and applies metal 3D printing topology optimization design technology to achieve a compact layout of the overall hydraulic system. Unlike the traditional discrete layout of hydraulic components, the platform space is greatly released, which is conducive to the whole machine to carry out other new functions and effectively improves the functionality of the whole machine.

[0080] (3) The system is lightweight. The weight of the hydraulic power unit 2 in this embodiment is only 40% of that of the traditional solution, which can effectively meet the load lifting of 50Kg, help the whole machine carry more rescue equipment or rescue more people, and effectively enhance the competitiveness of the product.

[0081] (4) Low cost: The hydraulic power unit 2 in this embodiment is driven by an electric motor, avoiding the purchase of expensive proportional valves and effectively reducing the overall system cost.

[0082] (5) The platform has strong power. The hydraulic power unit 2 in this embodiment is equipped with a small-volume spiral swing hydraulic cylinder, which not only reduces the weight and volume, but also has a larger torque under the same pressure, and the power for platform rotation and leveling is more sufficient, effectively supporting the improvement of platform load-bearing and rescue capabilities.

[0083] According to another aspect of the present invention, a fire truck is also provided, which includes the aforementioned fire truck aerial work platform. For example... Figure 10 As shown, the fire truck includes a boom 25, and the working platform body 1 is mounted on the boom 25 via a load-bearing component 5.

[0084] The above are merely exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fire truck aerial work platform, characterized in that, The fire trucks include ladder trucks, which include: Supporting component (5); The work platform body (1) is mounted on the bearing component (5) and can swing relative to the bearing component (5) to adjust the level of the work platform body (1); The hydraulic actuator (4) is connected to the bearing component (5) and the work platform body (1) respectively, and is configured to drive the work platform body (1) to swing relative to the bearing component (5). The hydraulic actuator (4) adopts a pump-controlled control method. The hydraulic power unit (2) includes a helical swing hydraulic cylinder. The hydraulic power unit (2) includes a hydraulic pump (7) and a first directional valve (9) connected to the hydraulic pump (7). The first directional valve (9) is connected to the hydraulic actuator (4). The hydraulic power unit (2) includes a first component (16). The first component (16) has a first pump chamber that accommodates the pump suction component of the hydraulic pump (7) and a first directional valve chamber that accommodates the valve core of the first directional valve (9). The first component (16) is 3D printed. The first component (16) also has a flow channel connecting the hydraulic pump (7) and the first directional valve (9) as well as a hydraulic fluid inlet and outlet (18) for connecting the hydraulic actuator (4) and the first directional valve (9). The hydraulic power unit (2) is located below the base of the work platform body (1). The fire truck aerial work platform also includes a manual control unit (3), which includes a manually operated second directional valve (15) connected to the hydraulic actuator (4). The fire truck aerial work platform also includes a first shuttle valve (11), the first inlet of which is connected to the first directional valve (9), the second inlet of which is connected to the second directional valve (15), and the outlet of which is connected to the hydraulic actuator (4). The first component (16) is also provided with a first shuttle valve chamber for accommodating the valve core of the first shuttle valve (11). The manual control unit (3) further includes a second component (17), which has a second reversing valve chamber for accommodating the valve core of the second reversing valve (15). The second component (17) is 3D printed. The second component (17) has a hollow structure (24) in the area without hydraulic flow channels.

2. The fire truck aerial work platform according to claim 1, characterized in that, The hydraulic power unit (2) also includes a first relief valve (10) connected to the hydraulic pump (7), and the first component (16) is also provided with a first relief valve cavity that accommodates the valve core of the first relief valve (10).

3. The fire truck aerial work platform according to claim 1, characterized in that, The hydraulic power unit (2) also includes a motor (8) that is connected to the hydraulic pump (7) for transmission, and the motor (8) is installed at one end of the first component (16).

4. The fire truck aerial work platform according to claim 3, characterized in that, The hydraulic power unit (2) also includes a hydraulic fluid tank (6) connected to the hydraulic pump (7), the hydraulic fluid tank (6) being installed at the end of the first component (16) away from the motor (8).

5. The fire truck aerial work platform according to claim 3, characterized in that, It also includes a controller that is signal-connected to the motor (8), the controller being configured to control the amount of action of the hydraulic actuator (4) by controlling the rotational speed of the motor (8).

6. The fire truck aerial work platform according to claim 1, characterized in that, The manual control unit (3) also includes a manual pump (13) connected to the second reversing valve (15).

7. The fire truck aerial work platform according to claim 6, characterized in that, The second component (17) is provided with a second pump chamber that accommodates the pump suction component of the manual pump (13); The manual control unit (3) also includes a second overflow valve (14) connected to the manual pump (13), and the second component (17) is provided with a second overflow valve cavity that accommodates the valve core of the second overflow valve (14).

8. The fire truck aerial work platform according to claim 1, characterized in that, The hydraulic actuator (4) includes a swing hydraulic cylinder, which includes a fixed part (19) and a rotating part (20) that rotates relative to the fixed part (19) under the drive of hydraulic fluid. One of the fixed part (19) and the rotating part (20) is connected to the bearing part (5), and the other is connected to the work platform body (1).

9. A fire truck, characterized in that, Includes the fire truck aerial work platform as described in any one of claims 1 to 8.

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