Metal 3D printed integrated pump-controlled hydraulic leveling system and fire engine

Abstract

To improve space utilization efficiency of a platform.SOLUTION: The present invention relates to an aerial work platform for a fire fighting vehicle and a fire fighting vehicle. The platform includes: a carrying component (5); a work platform body (1) mounted on the carrying component (5) and swingable relative to the carrying component (5) to adjust the levelness; a hydraulic actuating element (4) connected to the carrying component (5) and the body (1) and configured to drive the body (1) to swing relative to the carrying component (5); and a hydraulic power unit (2) including a hydraulic pump (7) and a first reversing valve (9) fluidly connected to the hydraulic pump (7), the first reversing valve being fluidly connected to the hydraulic actuating element (4), the hydraulic power unit including a first component (16), the first component being formed with a first pump cavity accommodating a pumping component of the hydraulic pump (7) and a first reversing valve cavity accommodating a valve core of the first reversing valve (9).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to and from Patent Application No. CN202211727010.6, filed December 30, 2022, the disclosure of which is incorporated herein by reference in its entirety.

[0002] Technical Field The present disclosure relates to the technical field of engineering machinery, and in particular to aerial work platforms for fire engines and fire engines. [Background technology]

[0003] Ladder fire trucks, aerial fire extinguishers, and fire truck aerial work platforms are emergency rescue equipment used for advanced firefighting, lifesaving, and special operations. Among aerial work vehicles, manned aerial rescue vehicles have the highest safety requirements, advanced design concepts, and high technology intensiveness, resulting in extremely high technical content. The leveling hydraulic system is a key system for real-time adjustment of the work platform angle, which is crucial for maintaining crew stability and ensuring the accurate rescue operation of the device. Due to limitations in traditional design and manufacturing processes, the hydraulic elements of aerial work platform leveling hydraulic systems are currently composed of independent components with poor integration, resulting in heavy and bulky leveling hydraulic systems. This limits the platform's effective space, reduces the safety of the aerial platform, and limits the platform's ability to transport various rescue equipment and rescue personnel. Currently, the payload capacity of a 53-meter ladder fire truck platform in a high-end firefighting product series is only 300 kg, of which only 80% is for crew space. Pumps, valves, motors, actuators, and other hydraulic system elements are manufactured separately, connected by pipelines, and individually placed on the platform along with the electrical control system, fire extinguishing water cannon and its water supply pipes, leaving no extra space on the platform to accommodate new functions.Compared to foreign products, the platform lacks space for a relay water supply device, making it impossible for firefighters to bring an external water source into the room for rescue, which not only significantly impacts rescue efficiency but also reduces the product's competitiveness in the market. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE INVENTION The present invention aims to provide an aerial work platform for a fire engine and a fire engine that improves the problem of inefficient space utilization of the platforms in the prior art.

[0005] According to one aspect of an embodiment of the present invention, there is provided an aerial work platform for a fire engine, the aerial work platform for a fire engine comprising: a carrying component; a work platform body attached to the support component, the work platform body being pivotable relative to the support component to adjust the levelness of the work platform body; hydraulically actuated elements respectively connected to the support component and the work platform body and configured to drive the work platform body to swing relative to the support component; a hydraulic power unit including a hydraulic pump; a first reversing valve fluidly connected to the hydraulic pump and fluidly connected to a hydraulically actuated element; and a first component having formed therein a first pump cavity that houses a pump component of the hydraulic pump and a first reversing valve cavity that houses a valve core of the first reversing valve.

[0006] In some embodiments, the first component is formed by 3D printing.

[0007] In some embodiments, the first component further defines a flow path fluidly connecting the hydraulic pump and the first reversing valve, and a hydraulic fluid inlet and outlet fluidly connecting the hydraulically actuated element and the first reversing valve.

[0008] In some embodiments, the hydraulic power unit further includes a first relief valve fluidly connected to the hydraulic pump, and the first component further includes a first relief valve cavity that accommodates a valve core of the first relief valve.

[0009] In some embodiments, the hydraulic power unit further includes a motor in operating communication with the hydraulic pump, the motor being mounted to an end of the first component.

[0010] In some embodiments, the hydraulic power unit further includes a hydraulic fluid tank in fluid communication with the hydraulic pump, the hydraulic fluid tank attached to the other end of the first component opposite the motor.

[0011] In some embodiments, the fire engine aerial work platform further includes a controller in signal communication with the motor, the controller configured to control the rotational speed of the motor, thereby controlling the amount of actuation of the hydraulically actuated element.

[0012] In some embodiments, the fire engine aerial work platform further includes a manual control unit, the manual control unit including a second reversing valve operated by a human, the second reversing valve fluidly connected to the hydraulically actuated element.

[0013] In some embodiments, the fire engine aerial work platform further includes a first shuttle valve, a first inlet of the first shuttle valve fluidly connected to the first reversing valve, a second inlet of the first shuttle valve fluidly connected to the second reversing valve, and an outlet of the first shuttle valve fluidly connected to the hydraulically actuated element, and the first component further includes a first shuttle valve cavity that accommodates a valve core of the first shuttle valve.

[0014] In some embodiments, the manual control unit further includes a second component, the second component including a second reversing valve cavity that accommodates a valve core of a second reversing valve.

[0015] In some embodiments, the manual control unit further includes a manual pump fluidly connected to the second reversing valve.

[0016] In some embodiments, the second component comprises a second pump cavity that accommodates a pump component of the hand pump; and The manual control unit further includes a second relief valve fluidly connected to the manual pump, the second component including a second relief valve cavity that accommodates a valve core of the second relief valve.

[0017] In some embodiments, the second component is formed by 3D printing.

[0018] In some embodiments, the hydraulically actuated element includes a swing hydraulic cylinder, the swing hydraulic cylinder including a stationary component and a rotating component that rotates relative to the stationary component under the drive of hydraulic fluid, one of the stationary component and the rotating component being connected to the support component and the other being connected to the work platform body.

[0019] According to another aspect of the present invention, there is also provided a fire engine including the above-described fire engine aerial work platform. [Means for solving the problem]

[0020] In the application of the technical solution of the present application, the first pump cavity and the first reversing valve cavity of the hydraulic pump are both integrated into the first component, which contributes to realizing a compact and lightweight hydraulic power unit, and also contributes to reducing the number of parts and components of the hydraulic power unit.

[0021] Other features and advantages of the present disclosure will become apparent from the following detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a three-dimensional structural view of an aerial work platform for a fire engine according to one embodiment of the present invention. [Figure 2] FIG. 2 is a three-dimensional structural view of the aerial work platform for a fire engine according to one embodiment of the present invention, viewed from another angle. [Figure 3]FIG. 2 is a diagram showing a hydraulic system of a fire engine aerial work platform in accordance with one embodiment of the present invention. [Figure 4] FIG. 1 is a structural diagram of a hydraulic system of a fire engine aerial work platform according to one embodiment of the present invention. [Figure 5] FIG. 2 is a structural diagram of a hydraulic power unit of a fire engine aerial work platform according to one embodiment of the present invention. [Figure 6] FIG. 1 is a structural diagram of a manual control unit of a fire engine aerial work platform according to one embodiment of the present invention. [Figure 7] FIG. 10 is a structural diagram of a second component of the fire engine aerial work platform in one embodiment of the present invention. [Figure 8] FIG. 2 is a three-dimensional structural view of the hydraulic operating elements of the fire engine aerial work platform in one embodiment of the present invention. [Figure 9] FIG. 2 is a three-dimensional structural view of the hydraulic operating elements of the fire engine aerial work platform in one embodiment of the present invention, taken at another angle. [Figure 10] 1 is a structural diagram of a fire engine according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] The drawings as part of this disclosure are used to provide a further understanding of the present disclosure. The exemplary embodiments of the present disclosure and the description thereof are used to explain the present disclosure, but are not intended to unduly limit the present disclosure.

[0024] The following provides a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are obviously only a part of the embodiments of the present invention, but not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and does not serve as any restriction on the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

[0025] 1 to 4, the aerial work platform for a fire engine of this embodiment includes a carrying component 5, a work platform body 1, a hydraulic operating element 4, and a hydraulic power unit 2.

[0026] The work platform body 1 is attached to a support component 5 and is swingable relative to the support component 5 to adjust the levelness of the work platform body 1. The hydraulic actuating element 4 is connected to the support component 5 and the work platform body 1, respectively, and is configured to drive the work platform body 1 to swing relative to the support component 5. The hydraulic power unit 2 includes a hydraulic pump 7 and a first reversing valve 9 fluidly connected to the hydraulic pump 7. The first reversing valve 9 is fluidly connected to the hydraulic actuating element 4. The hydraulic power unit 2 includes a first component 16. The first component 16 is formed by a first pump cavity that houses a pump component of the hydraulic pump 7 and a first reversing valve cavity that houses a valve core of the first reversing valve 9.

[0027] In this embodiment, the first pump cavity and the first reversing valve cavity of the hydraulic pump 7 are both integrated into the first component, which contributes to realizing a smaller and lighter hydraulic power unit 2 and further contributes to reducing the number of parts and components of the hydraulic power unit 2.

[0028] In some embodiments, the hydraulic pump 7 is a gear pump and the pump component is a gear of the gear pump. In some other embodiments, the hydraulic pump 7 is an impeller pump and the pump component is an impeller of the impeller pump. In some other embodiments, the hydraulic pump 7 is a plunger pump and the pump component is a plunger of the plunger pump.

[0029] In some embodiments, the first component 16 is formed by 3D printing.

[0030] The first component 16 further includes a flow path fluidly connecting the hydraulic pump 7 and the first reversing valve 9, and a hydraulic oil inlet / outlet 18 fluidly connecting the hydraulically actuated element 4 and the first reversing valve 9.

[0031] In this embodiment, the first reversing valve 9 includes an inlet in communication with the hydraulic pump 7, a return port in communication with the hydraulic fluid tank 6, a first actuation port connected to a first cavity of the hydraulic actuation element 4, and a second actuation port connected to a second cavity of the first hydraulic actuation element 4. In some embodiments, the first cavity is a rod-side cavity of the hydraulic actuation element 4, and the second cavity is a non-rod-side cavity of the hydraulic actuation element 4.

[0032] When hydraulic oil is introduced into a first cavity of the hydraulic actuating element 4 and the hydraulic oil is discharged from the second cavity, the movable component of the hydraulic actuating element 4 moves in a first direction, and when hydraulic oil is introduced into a second cavity of the hydraulic actuating element 4 and the hydraulic oil is discharged from the first cavity, the movable component of the hydraulic actuating element 4 moves in a second direction, which is opposite to the first direction.

[0033] The first component 16 has two hydraulic oil inlets and outlets 18. One hydraulic oil inlet and outlet communicates with a first operating port of the first reversing valve 9, and the other communicates with a second operating port of the first reversing valve 9.

[0034] In some embodiments, the hydraulic power unit 2 further includes a first relief valve 10 fluidly connected to the hydraulic pump 7, and the first component 16 further includes a first relief valve cavity that accommodates a valve core of the first relief valve 10.

[0035] 5, the hydraulic power unit 2 further includes a motor 8 that is communicatively connected to the hydraulic pump 7. The motor 8 is attached to an end of the first component 16.

[0036] 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 is attached to the other end of the first component 16 opposite the motor 8.

[0037] The fire engine aerial work platform further includes a control device signal-connected to the motor 8. The control device is configured to control the rotational speed of the motor 8, thereby controlling the actuation amount of the hydraulic actuating element 4. In this embodiment, parts and components such as the hydraulic oil tank 6, the first reversing valve 9, the motor 8, and the hydraulic pump 7 are integrated, which contributes to realizing a lighter and more compact hydraulic power unit 2 and reducing the number of parts and components, thereby simplifying the structure of the hydraulic power unit 2 and reducing the space occupied by the hydraulic power unit 2.

[0038] 3, 4, and 6, the fire engine aerial work platform further includes a manual control unit 3. The manual control unit 3 includes a second reversing valve 15 that is operated by a human. The second reversing valve 15 is fluidly connected to the hydraulic actuating element 4.

[0039] The fire engine aerial work platform further includes a first shuttle valve 11. A first inlet of the first shuttle valve 11 is fluidly connected to the first reversing valve 9, a second inlet of the first shuttle valve 11 is fluidly connected to the second reversing valve 15, and an outlet of the first shuttle valve 11 is fluidly connected to the hydraulically actuated element 4. The first component 16 further includes a first shuttle valve cavity that houses a valve core of the first shuttle valve 11.

[0040] 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 optimization design.

[0041] The second reversing valve 15 includes an inlet for introducing hydraulic fluid, a return port in communication with the hydraulic fluid tank 6, a first actuation port connected to a first cavity of the hydraulic actuation element 4, and a second actuation port connected to a second cavity of the first hydraulic actuation element 4. In some embodiments, the first cavity is a rod-side cavity of the hydraulic actuation element 4, and the second cavity is a non-rod-side cavity of the hydraulic actuation element 4.

[0042] In this embodiment, the outlet of the first shuttle valve 11 is connected to the rod side cavity of the hydraulic actuating element 4, the first inlet of the first shuttle valve 11 is fluidly connected to the first actuation port of the first reversing valve 9, and the second inlet of the first shuttle valve 11 is fluidly connected to the first actuation port of the second reversing valve 15.

[0043] The fire engine aerial work platform further includes a second shuttle valve 12. An outlet of the second shuttle valve 12 is connected to the rodless cavity of the hydraulic actuating element 4, a first inlet of the second shuttle valve 12 is fluidly connected to the second actuation port of the first reversing valve 9, and a second inlet of the second shuttle valve 12 is fluidly connected to the second actuation port of the second reversing valve 15.

[0044] In some embodiments, the manual control unit 3 further includes a second component 17. The second component 17 comprises a second reversing valve cavity that houses the valve core of the second reversing valve 15.

[0045] The second component 17 is made of one of carbon steel, alloy steel, stainless steel, and aluminum alloy. The second component 17 employs a topology optimization design and includes a hollowed-out structure 24 without hydraulic flow paths, as shown in FIG. 7, in order to reduce the mass of the second component 17.

[0046] As shown in FIG. 6, the manual control unit 3 further includes a manual pump 13 fluidly connected to a second reversing valve 15 .

[0047] The second component 17 comprises a second pump cavity that houses the pump components of the manual pump 13, and the manual control unit 3 further comprises a second relief valve 14 fluidly connected to the manual pump 13, and the second component 17 comprises a second relief valve cavity that houses a valve core of the second relief valve 14.

[0048] In this embodiment, the second reversing valve 15 and the manual pump 13 of the manual control unit 3 are integrated into an integrated component, which contributes to making the manual control unit 3 lighter and smaller, and reducing the number of parts and components, thereby simplifying the structure of the manual control unit 3 and reducing the space occupied by the manual control unit 3.

[0049] In some embodiments, the second component 17 is formed by 3D printing.

[0050] In this embodiment, the manual pump 13 is a foot-operated manual pump. The manual control unit 3 is attached to the base of the work platform main body 1 and is arranged below the fence of the work platform main body 1. The hydraulic power unit 2 is arranged below the base of the work platform main body 1 to ensure a working space above the work platform main body 1.

[0051] 8 and 9, the hydraulic actuating element 4 includes a swing hydraulic cylinder. The swing hydraulic cylinder includes a fixed component 19 and a rotating component 20 that rotates relative to the fixed component 19 under the drive of hydraulic oil. One of the fixed component 19 and the rotating component 20 is connected to the work platform body 1, and the other is connected to the support component 5.

[0052] The fire engine aerial work platform further includes a balance valve 26. The balance valve 26 is fluidly connected to the hydraulic actuation element 4 and ensures smooth movement of the hydraulic actuation element 4.

[0053] The balance valve 26 includes a first fluid port A and a second fluid port B. Hydraulic oil is introduced into one of the first fluid port A and the second fluid port B, and the hydraulic oil is discharged from the other to the hydraulic oil tank 6. When hydraulic oil is introduced into the first fluid port A, the rotating component 20 rotates counterclockwise, and when hydraulic oil is introduced into the second fluid port B, the rotating component 20 rotates clockwise.

[0054] The fixed component 19 comprises a connecting lug 21 for connecting the work platform body 1. The rotating component 20 comprises a flange 22 for connecting the carrying component 5.

[0055] The fire engine aerial work platform further includes a rotation detection component 23 for detecting the amount of rotation of the rotation component 20. In some embodiments, the rotation detection component 23 includes an encoder.

[0056] The fire engine aerial work platform further includes an angle detection component for detecting the angle of the work platform main body 1 relative to the horizontal direction. By monitoring the angle detected by the angle detection component and the amount of rotation detected by the rotation amount detection component, the attitude of the work platform main body 1 is monitored in real time.

[0057] 1 and 2, the support component 5 includes a connecting arm, and the hydraulic actuating element 4 is attached to the base of the work platform body 1, and the connecting arm is connected to the hydraulic actuating element 4 and extends in a direction away from the work platform body 1. In some embodiments, the work platform body 1 includes two hydraulic actuating elements 4, and each hydraulic actuating element 4 is connected to a connecting arm. The two hydraulic actuating elements 4 are arranged symmetrically with respect to the centerline of the work platform body 1.

[0058] In some embodiments, the hydraulically actuated element 4 is a lightweight, compact, high-torque oscillating hydraulic cylinder, which has the advantages of occupying less space and being lighter than prior art direct acting hydraulic cylinders or other direct acting devices.

[0059] When the diameter of the oscillating hydraulic cylinder is 198 mm or less, the axial length of the oscillating hydraulic cylinder is 171 mm or less, the rotation angle of the rotating component 20 is 170° or more, and the operating oil pressure is 20 MPa, one hydraulic cylinder can output a torque of 2300 NM.

[0060] The hydraulic power unit 2 of this embodiment can be installed in ladder fire engines, aerial fire extinguishers, aerial platforms, scissor-type aerial platforms, and other aerial emergency rescue fire engines.

[0061] The fire engine aerial work platform of this embodiment has the following technical effects.

[0062] (1) System with low energy consumption: The hydraulic power unit 2 of this embodiment uses metal 3D printing technology to achieve a compatible design of the oil passage structure and a plug-in compatible integrated design, thereby reducing flow passage pressure loss. The hydraulic operating element 4 is controlled by a pump control method, and compared to the conventional method of controlling it by a valve control method, the use of a high-precision motor 8 achieves direct supply of flow rate as needed, reducing waste. This is because the system is always maintained in an efficient operating state, and the motor does not need to rotate at high speed but automatically adjusts according to the required speed, thereby significantly reducing the energy consumption of the system.

[0063] (2) Large working platform space: The hydraulic power unit 2 of this embodiment realizes an integrated design of multiple elements, and further applies metal 3D printing topology optimization design technology to achieve a compact overall layout of the hydraulic system. Unlike the traditional independent layout of hydraulic elements, this significantly frees up platform space, allowing other new functions to be placed on the entire machine, thereby effectively improving the functionality of the entire machine.

[0064] (3) Lightweight system: The weight of the hydraulic power unit 2 of this embodiment is only 40% of that of the conventional solution, which can effectively increase the load capacity by 50 kg, helping the entire machine to carry more rescue equipment or rescue more people, thereby effectively improving the competitiveness of the product.

[0065] (4) Low cost: The hydraulic power unit 2 of this embodiment uses a motor for driving, which makes it possible to avoid purchasing an expensive proportional valve, and effectively reduces the cost of the entire system.

[0066] (5) Large platform power: The hydraulic power unit 2 of this embodiment is equipped with a small-volume spiral oscillating hydraulic cylinder, which not only reduces weight and volume but also provides greater torque under the same pressure, thereby making the platform's rotational horizontal force more appropriate and effectively helping to improve the platform's load capacity and rescue capability.

[0067] According to another aspect of the present invention, there is also provided a fire engine including the above-mentioned fire engine aerial work platform. As shown in Fig. 10, the fire engine includes a work arm 25, and the work platform body 1 is attached to the work arm 25 by a carrying component 5.

[0068] The above are only illustrative embodiments of the present invention, and are not intended to limit the present invention, and all modifications, equivalent replacements and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. [Explanation of symbols]

[0069] 1. Work platform body 2 Hydraulic power unit 3 Manual Control Unit 4 Hydraulic actuating elements 5. Supporting Components 6 Hydraulic oil tank 7. Hydraulic pump 8 motors 9 First reversing valve 10 First relief valve 11 First shuttle valve 12 Second shuttle valve 13. Hand-powered pump 14 Second relief valve 15 Second reversing valve 16 First Component 17 Second Component 18 Hydraulic oil inlet / outlet 19 Fixed Components 20 Rotating Components 21 Connection Lag 22 flange 23 Rotation Detection Components 24 Hollow structure 25 Working Arm 26 Balance valve

Claims

1. 1. An aerial work platform for a fire engine, comprising: a support component (5); a work platform body (1) attached to the support component (5), the work platform body (1) being swingable relative to the support component (5) to adjust the levelness of the work platform body (1); a hydraulically actuated element (4) connected to the support component (5) and the work platform body (1) and configured to drive the work platform body (1) to swing relative to the support component (5); a hydraulic power unit (2) including a hydraulic pump (7); a first reversing valve (9) fluidly connected to the hydraulic pump (7) and to the hydraulic actuating element (4); and a first component (16) in which a first pump cavity for accommodating a pump component of the hydraulic pump (7) and a first reversing valve cavity for accommodating a valve core of the first reversing valve (9) are formed; the first component (16) is formed by 3D printing; the first component (16) further defines a flow path fluidly connecting the hydraulic pump (7) and the first reversing valve (9), and a hydraulic oil inlet / outlet (18) fluidly connecting the hydraulically actuated element (4) and the first reversing valve (9); The hydraulic power unit (2) is disposed under the base of the work platform body (1) to ensure a working space above the work platform body (1).

2. 2. The fire engine aerial work platform of claim 1, wherein the hydraulic power unit (2) further includes a first relief valve (10) fluidly connected to the hydraulic pump (7), and the first component (16) further includes a first relief valve cavity that houses a valve core of the first relief valve (10).

3. 2. The aerial work platform for a fire engine according to claim 1, wherein the hydraulic power unit (2) further includes a motor (8) in transmission connection with the hydraulic pump (7), the motor (8) being attached to an end of the first component (16).

4. 4. The fire engine aerial work platform of claim 3, wherein the hydraulic power unit (2) further includes a hydraulic oil tank (6) in fluid communication with the hydraulic pump (7), the hydraulic oil tank (6) being attached to an end of the first component (16) opposite the motor (8).

5. 4. The fire engine aerial work platform according to claim 3, further comprising a control device in signal communication with the motor (8), the control device being configured to control the rotational speed of the motor (8) and thereby control the actuation amount of the hydraulic actuation element (4).

6. 2. The fire engine aerial work platform of claim 1, further comprising a manual control unit (3), the manual control unit (3) including a second reversing valve (15) operated by a human, the second reversing valve (15) fluidly connected to the hydraulically actuated element (4).

7. 7. The fire engine aerial work platform of claim 6, further comprising a first shuttle valve (11), a first inlet of the first shuttle valve (11) fluidly connected to the first reversing valve (9), a second inlet of the first shuttle valve (11) fluidly connected to the second reversing valve (15), and an outlet of the first shuttle valve (11) fluidly connected to the hydraulically actuated element (4), and the first component (16) further comprises a first shuttle valve cavity that houses a valve core of the first shuttle valve (11).

8. 7. The fire engine aerial work platform of claim 6, wherein the manual control unit (3) further includes a second component (17), the second component (17) comprising a second reversing valve cavity that accommodates a valve core of the second reversing valve (15).

9. 9. The fire engine aerial work platform of claim 8, wherein the manual control unit (3) further comprises a human-powered pump (13) fluidly connected to the second reversing valve (15).

10. the second component (17) comprises a second pump cavity that accommodates a pump component of the human-powered pump (13); 10. The fire engine aerial work platform of claim 9, wherein the manual control unit (3) further includes a second relief valve (14) fluidly connected to the human-powered pump (13), and the second component (17) includes a second relief valve cavity that houses a valve core of the second relief valve (14).

11. 9. The aerial work platform for a fire engine according to claim 8, wherein the second component (17) is formed by 3D printing.

12. 2. The aerial work platform for a fire engine according to claim 1, wherein the hydraulically actuated element (4) includes a swing hydraulic cylinder, the swing hydraulic cylinder including a fixed component (19) and a rotating component (20) that rotates relative to the fixed component (19) under the drive of hydraulic oil, one of the fixed component (19) and the rotating component (20) being connected to the support component (5) and the other being connected to the work platform body (1).

13. A fire engine comprising the aerial work platform for a fire engine according to any one of claims 1 to 12.

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